Cross Reference: /src/sys/fs/tmpfs

History log of /src/sys/fs/tmpfs
Revision	Date	Author	Comments
1.1	28-Jul-2008	pooka	branches: 1.1.2; 1.1.4; 1.1.6; 1.1.8; 1.1.20; Install mount argument structure header just like every other file system.
1.1.20.2	04-May-2009	yamt	sync with head.
1.1.20.1	28-Jul-2008	yamt	file Makefile was added on branch yamt-nfs-mp on 2009-05-04 08:13:44 +0000
1.1.8.2	19-Oct-2008	haad	Sync with HEAD.
1.1.8.1	28-Jul-2008	haad	file Makefile was added on branch haad-dm on 2008-10-19 22:17:18 +0000
1.1.6.2	28-Sep-2008	mjf	Sync with HEAD.
1.1.6.1	28-Jul-2008	mjf	file Makefile was added on branch mjf-devfs2 on 2008-09-28 10:40:50 +0000
1.1.4.2	18-Sep-2008	wrstuden	Sync with wrstuden-revivesa-base-2.
1.1.4.1	28-Jul-2008	wrstuden	file Makefile was added on branch wrstuden-revivesa on 2008-09-18 04:36:55 +0000
1.1.2.2	28-Jul-2008	simonb	Sync with head.
1.1.2.1	28-Jul-2008	simonb	file Makefile was added on branch simonb-wapbl on 2008-07-28 14:37:35 +0000
1.8	20-Apr-2015	riastradh	Make VOP_LINK return directory still locked and referenced. Ride 7.99.10 bump.
1.7	22-Jun-2010	rmind	branches: 1.7.18; 1.7.36; Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.6	09-Nov-2006	jmmv	branches: 1.6.52; 1.6.74; 1.6.76; Audit kqueue notifications. The reference behavior is taken from MFS and is represented in the regression tests.
1.5	05-Nov-2006	jmmv	Exporting tmpfs file systems through NFS now works. Sure, file handles are not persistent across reboots but neither are those of MFS, which we are trying to replace. We should probably warn the user somehow, but not prevent him doing this if he really wants to. While here add a "reply" to the code-style change item.
1.4	05-Nov-2006	jdolecek	add one code style and one knote-related item
1.3	23-Sep-2005	jmmv	branches: 1.3.6; 1.3.26; 1.3.30; 1.3.32; Synchronize NFS status with reality. After yamt@ changes (I think with the implementation of getpages and putpages and the use of UBC in the read and write operations), the worst problem has gone away which was a panic when a file's contents were modified in the original file system and then read through the NFS mount point. Also remove the entry about optimization. While tmpfs still has room for improvement, it has become a lot better lately, thanks to the string pools and the changes yamt@ did in the anonymous objects handling.
1.2	23-Sep-2005	wiz	Fix typo, add missing parenthesis.
1.1	23-Sep-2005	jmmv	Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.3.32.1	10-Dec-2006	yamt	sync with head.
1.3.30.1	18-Nov-2006	ad	Sync with head.
1.3.26.3	30-Dec-2006	yamt	sync with head.
1.3.26.2	21-Jun-2006	yamt	sync with head.
1.3.26.1	23-Sep-2005	yamt	file TODO was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.3.6.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.3.6.1	23-Sep-2005	skrll	file TODO was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.6.76.1	03-Jul-2010	rmind	sync with head
1.6.74.1	17-Aug-2010	uebayasi	Sync with HEAD.
1.6.52.1	11-Aug-2010	yamt	sync with head.
1.7.36.1	06-Jun-2015	skrll	Sync with HEAD
1.7.18.1	03-Dec-2017	jdolecek	update from HEAD
1.6	11-Oct-2014	uebayasi	Define filesystem attributes with vfs dependency.
1.5	09-May-2012	riastradh	branches: 1.5.2; Adapt tmpfs_rename to use genfs_rename.
1.4	22-Jun-2010	rmind	branches: 1.4.8; 1.4.12; Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.3	02-Mar-2010	pooka	branches: 1.3.2; Don't generate unused fs_thefs.h headers.
1.2	11-Dec-2005	christos	branches: 1.2.18; 1.2.76; 1.2.98; merge ktrace-lwp.
1.1	10-Sep-2005	jmmv	branches: 1.1.6; Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.1.6.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.1.6.1	10-Sep-2005	skrll	file files.tmpfs was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.2.98.2	17-Aug-2010	uebayasi	Sync with HEAD.
1.2.98.1	30-Apr-2010	uebayasi	Sync with HEAD.
1.2.76.2	11-Aug-2010	yamt	sync with head.
1.2.76.1	11-Mar-2010	yamt	sync with head
1.2.18.2	21-Jun-2006	yamt	sync with head.
1.2.18.1	11-Dec-2005	yamt	file files.tmpfs was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.3.2.1	03-Jul-2010	rmind	sync with head
1.4.12.1	02-Jun-2012	mrg	sync to latest -current.
1.4.8.1	23-May-2012	yamt	sync with head.
1.5.2.1	03-Dec-2017	jdolecek	update from HEAD
1.56	17-May-2020	ad	PR kern/55268: tmpfs is slow tmpfs_getpages(): handle the PGO_LOCKED case and implement lazy update of atime/mtime.
1.55	19-Apr-2018	christos	s/static inline/static __inline/g for consistency.
1.54	01-Mar-2017	hannken	branches: 1.54.12; Change the protocol to update a mounted file system from read-write to read-only and vice versa: - Add an internal flag IMNT_WANTRDONLY. - Set either IMNT_WANTRDWR or IMNT_WANTRDONLY if going from or to read-only. - After successfull call to VFS_MOUNT() set or clear MNT_RDONLY. Adapt tmpfs and rumpfs to the new protocol. Other file systems will be updated when they get the IMNT_CAN_RWTORO property. Welcome to 7.99.64
1.53	27-Jan-2017	hannken	Run vflush() when going from read/write to read only.
1.52	06-Jul-2015	hannken	branches: 1.52.2; 1.52.4; Change tmpfs to vcache. - Use tmpfs node address as key. - Remove tn_vlock, field tn_vnode now protected by vcache. - Add a hold count to tmpfs node to prevent nodes from disappearing while tmpfs_fhtovp() trys to vcache_get() them. Last holder destroys reclaimed nodes. - Remove the now unneeded parent unlock/lock for lookup of '..'.
1.51	06-Jul-2015	hannken	Use VFS_PROTOS() for tmpfs.
1.50	07-Jun-2014	martin	branches: 1.50.4; Remove the hardcoded 4 MB free kernel memory limit and replace it by uvmexp.freetarg, as discussed on tech-kern. Main purpose is to make tmpfs usable (as far as possible) on small memory machines. This is a bit experimental, but we need to give it some real world exposure to see how well it works.
1.49	30-Apr-2014	christos	handle MNT_UPDATE
1.48	23-Nov-2013	rmind	branches: 1.48.2; - Simplify tmpfs_update(), eliminate tmpfs_note_t::tn_status and deferred timestamp updates. Fix some incorrect updates and plug some missing ones. Should fix PR/48385. - tmpfs_rmdir: avoid O(n) scan when the directory is not empty and whiteout entries were never added.
1.47	18-Nov-2013	rmind	Make tmpfs_node_t::tn_gen a 32-bit number, keep it in sync with tmpfs_fid_t. Also, change tn_status to unsigned while here.
1.46	08-Nov-2013	rmind	tmpfs: replace the broken tmpfs_dircookie() logic which uses the node address truncated to 31 bits (required for 32-bit readdir compatibility, e.g. linux32). Instead, assign 2^31 range using the following logic: - The first half of the 2^31 is assigned incrementally (the fast path). - When exceeded, use the second half of 2^31, but manage with vmem(9). It will require 2 billion files per-directory to trigger vmem(9) usage. Also, while here, add some fixes for tmpfs_unmount(). Should fix PR/47739, PR/47480, PR/46088 and PR/41068. Thanks to wiz@ for stress testing.
1.45	27-Sep-2011	christos	branches: 1.45.2; 1.45.12; 1.45.16; define and use TMPFS_MAXNAMLEN instead of MAXNAMLEN
1.44	29-May-2011	rmind	- Rework and document inode reference counting. Also document inode life cycle (destruction part). Perform link counting in tmpfs_dir_attach() and tmpfs_dir_detach(), instead of alloc/free and arbitrary places. Fixes PR/44285, PR/44288, PR/44657 and likely PR/42484. - Fix the race between the lookup and inode destruction. Fixes PR/43167 and its duplicates PR/40088, PR/40757. - Improve tmpfs_rename() locking a little, fix kqueue event notifications and also fix PR/43617. Add simplistic tmpfs_parentcheck_p(); to be expanded and used for further rename() locking fixes. - Cache directory entry "hint" in the tmpfs node, add tmpfs_dir_cached(), and thus avoid unnecessary lookup in tmpfs_remove() and tmpfs_rmdir(). - Set correct _PC_FILESIZEBITS value in tmpfs_pathconf(). Fixes PR/43576. - Few minor fixes.
1.43	29-May-2011	christos	undo the multiple inclusion protection part.
1.42	29-May-2011	rmind	- Prevent tmpfs.h from inclusion in userland. - Clean up and KNF tmpfs.h a little bit.
1.41	24-May-2011	rmind	- Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.40	19-May-2011	rmind	- tmpfs: do not create dirent/node pools per-mount, there is no need to. - tmpfs_mount: fix a leak of mount structures in error path.
1.39	13-Jan-2011	pooka	branches: 1.39.2; Add some support for unionfs (not built by default). It's still missing at least opaque directory support, but until someone figures out how that should work on ffs (see PR kern/kern/44383), there's no point in trying to figure out how it should work here.
1.38	22-Jun-2010	rmind	Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.37	29-Jul-2008	pooka	branches: 1.37.14; 1.37.16; Solve the fstat-wants-to-look-at-kernel-data-structures in a nicer way: don't export the fs internals to innocent userspace programs which just want to mount the file system.
1.36	28-Jul-2008	pooka	shuffle around some more defs for fstat noticed by Kurt Schreiner on current-users
1.35	28-Jul-2008	pooka	Install mount argument structure header just like every other file system.
1.34	19-Jun-2008	christos	branches: 1.34.2; - setting the birthdate is valid in setattr. - don't call nanotime if not needed. - don't call tempfs_update() if tempfs_chtimes succeeded, because it just did.
1.33	28-Apr-2008	martin	branches: 1.33.2; 1.33.4; Remove clause 3 and 4 from TNF licenses
1.32	06-Feb-2008	jmmv	branches: 1.32.6; 1.32.8; 1.32.10; u_int is not a C99 standard type, so spell it out completely as unsigned int.
1.31	06-Feb-2008	jmmv	Drop trailing whitespace.
1.30	02-Jan-2008	ad	Merge vmlocking2 to head.
1.29	08-Dec-2007	pooka	branches: 1.29.4; Remove cn_lwp from struct componentname. curlwp should be used from on. The NDINIT() macro no longer takes the lwp parameter and associates the credentials of the calling thread with the namei structure.
1.28	10-Nov-2007	ad	branches: 1.28.2; Back out the tmpfs changes; there appears to be a bug lurking.
1.27	06-Nov-2007	ad	Merge from vmlocking.
1.26	22-Feb-2007	thorpej	branches: 1.26.4; 1.26.16; 1.26.18; 1.26.24; TRUE -> true, FALSE -> false
1.25	21-Feb-2007	thorpej	Replace the Mach-derived boolean_t type with the C99 bool type. A future commit will replace use of TRUE and FALSE with true and false.
1.24	13-Nov-2006	jmmv	branches: 1.24.4; Fix typo in comment.
1.23	05-Nov-2006	jmmv	Protect the dircookie stuff with _KERNEL. Fixes build problems of mount_tmpfs as reported by Hisashi T Fujinaka in private mail.
1.22	05-Nov-2006	jmmv	Truncate directory cookies to 31 bits to avoid problems exposed in Linux binaries which cast the returned values to 64-bits and fail due to sign expansion. More details are provided in the big comment in tmpfs.h that describes how the new tmpfs_dircookie works. This is a rather ugly hack that shall be fixed with a cleaner solution, but this resolves the problem in an effective way. Fixes kern PR/32034.
1.21	23-Jul-2006	ad	branches: 1.21.4; 1.21.6; Use the LWP cached credentials where sane.
1.20	27-May-2006	yamt	branches: 1.20.4; hide more by ifdef _KERNEL.
1.19	14-May-2006	elad	branches: 1.19.2; integrate kauth.
1.18	31-Mar-2006	riz	Swap the order of the tf_gen and tf_id members of struct tmpfs_fid, since tf_id needs 8-byte alignment on some architectures (like amd64). struct tmpfs_fid now fits in 16 bytes on amd64 again. OK matt@
1.17	26-Mar-2006	martin	Restrict generation numbers to 32bit values - we would have had to bump _VFS_MAXFIDSZ to 24 otherwise for 64bit archs.
1.16	16-Feb-2006	perry	branches: 1.16.2; 1.16.4; 1.16.6; Change "inline" back to "__inline" in .h files -- C99 is still too new, and some apps compile things in C89 mode. C89 keywords stay. As per core@.
1.15	16-Feb-2006	jmmv	Do not use unnamed structures/unions without instances; they break the build under vax because of gcc 2.95. Found by he@.
1.14	10-Feb-2006	christos	make the include files usable from userland.
1.13	24-Dec-2005	jmmv	branches: 1.13.2; 1.13.4; 1.13.6; Remove a conditional by always using inlined functions in favour of macros. This way, the code is clearer and there shouldn't be any performance difference (if the compiler DTRT). Suggested by chs@.
1.12	11-Dec-2005	christos	merge ktrace-lwp.
1.11	06-Dec-2005	yamt	VFS_TO_TMPFS: remove a wrong assertion. it's wrong because TMPFS_PAGES_MAX can be decreased.
1.10	03-Dec-2005	christos	- protect userland exported files against multiple inclusion. - make sure that kernel only files don't compile in userland using #error - XXX: some kernel only files still get installed. - XXX: some files used in userland, don't get installed.
1.9	02-Nov-2005	yamt	branches: 1.9.2; merge yamt-vop branch. remove following VOPs. VOP_BLKATOFF VOP_VALLOC VOP_BALLOC VOP_REALLOCBLKS VOP_VFREE VOP_TRUNCATE VOP_UPDATE
1.8	29-Sep-2005	jmmv	branches: 1.8.2; Implement the tmpfs_advlock operation. Makes "user-level" file locking work (aka lockf(3)).
1.7	28-Sep-2005	yamt	tmpfs_getattr: return up-to-date timestamps.
1.6	23-Sep-2005	jmmv	Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.5	23-Sep-2005	jmmv	Apply the NFS exports list rototill patch: - Remove all NFS related stuff from file system specific code. - Drop the vfs_checkexp hook and generalize it in the new nfs_check_export function, thus removing redundancy from all file systems. - Move all NFS export-related stuff from kern/vfs_subr.c to the new file sys/nfs/nfs_export.c. The former was becoming large and its code is always compiled, regardless of the build options. Using the latter, the code is only compiled in when NFSSERVER is enabled. While doing this, also make some functions in nfs_subs.c conditional to NFSSERVER. - Add a new command in nfssvc(2), called NFSSVC_SETEXPORTSLIST, that takes a path and a set of export entries. At the moment it can only clear the exports list or append entries, one by one, but it is done in a way that allows setting the whole set of entries atomically in the future (see the comment in mountd_set_exports_list or in doc/TODO). - Change mountd(8) to use the nfssvc(2) system call instead of mount(2) so that it becomes file system agnostic. In fact, all this whole thing was done to remove a 'XXX' block from this utility! - Change the mount, newfs and fsck userland utilities to not deal with NFS exports initialization; done internally by the kernel when initializing the NFS support for each file system. - Implement an interface for VFS (called VFS hooks) so that several kernel subsystems can run arbitrary code upon receipt of specific VFS events. At the moment, this only provides support for unmount and is used to destroy NFS exports lists from the file systems being unmounted, though it has room for extension. Thanks go to yamt@, chs@, thorpej@, wrstuden@ and others for their comments and advice in the development of this patch.
1.4	15-Sep-2005	yamt	change the way to handle directory "offsets" so that they won't be changed when removing entries in the directory. some applications like cvs rely on this.
1.3	13-Sep-2005	yamt	- don't waste/leak kva. - implement getpages/putpages. support mmap. - eliminate meaningless memcpy. - ubcify.
1.2	10-Sep-2005	jmmv	wiz@ remembers that the preferred way to spell file-system in NetBSD is file system.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.8.2.2	29-Oct-2005	yamt	as tmpfs_update never fails, make it return void. suggested by Chuck Silvers.
1.8.2.1	20-Oct-2005	yamt	adapt tmpfs.
1.9.2.4	11-Dec-2005	christos	Sync with head.
1.9.2.3	12-Nov-2005	skrll	Adapt to branch
1.9.2.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.9.2.1	02-Nov-2005	skrll	file tmpfs.h was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.13.6.2	01-Jun-2006	kardel	Sync with head.
1.13.6.1	22-Apr-2006	simonb	Sync with head.
1.13.4.1	09-Sep-2006	rpaulo	sync with head
1.13.2.1	18-Feb-2006	yamt	sync with head.
1.16.6.2	24-May-2006	tron	Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
1.16.6.1	28-Mar-2006	tron	Merge 2006-03-28 NetBSD-current into the "peter-altq" branch.
1.16.4.3	06-May-2006	christos	- Move kauth_cred_t declaration to <sys/types.h> - Cleanup struct ucred; forward declarations that are unused. - Don't include <sys/kauth.h> in any header, but include it in the c files that need it. Approved by core.
1.16.4.2	19-Apr-2006	elad	sync with head.
1.16.4.1	08-Mar-2006	elad	Adapt to kernel authorization KPI.
1.16.2.4	11-Aug-2006	yamt	sync with head
1.16.2.3	26-Jun-2006	yamt	sync with head.
1.16.2.2	24-May-2006	yamt	sync with head.
1.16.2.1	01-Apr-2006	yamt	sync with head.
1.19.2.1	19-Jun-2006	chap	Sync with head.
1.20.4.6	11-Feb-2008	yamt	sync with head.
1.20.4.5	21-Jan-2008	yamt	sync with head
1.20.4.4	26-Feb-2007	yamt	sync with head.
1.20.4.3	30-Dec-2006	yamt	sync with head.
1.20.4.2	21-Jun-2006	yamt	sync with head.
1.20.4.1	27-May-2006	yamt	file tmpfs.h was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.21.6.1	10-Dec-2006	yamt	sync with head.
1.21.4.1	18-Nov-2006	ad	Sync with head.
1.24.4.1	27-Feb-2007	yamt	- sync with head. - move sched_changepri back to kern_synch.c as it doesn't know PPQ anymore.
1.26.24.3	18-Feb-2008	mjf	Sync with HEAD.
1.26.24.2	27-Dec-2007	mjf	Sync with HEAD.
1.26.24.1	19-Nov-2007	mjf	Sync with HEAD.
1.26.18.3	23-Mar-2008	matt	sync with HEAD
1.26.18.2	09-Jan-2008	matt	sync with HEAD
1.26.18.1	08-Nov-2007	matt	sync with -HEAD
1.26.16.3	09-Dec-2007	jmcneill	Sync with HEAD.
1.26.16.2	11-Nov-2007	joerg	Sync with HEAD.
1.26.16.1	06-Nov-2007	joerg	Sync with HEAD.
1.26.4.2	08-Oct-2007	ad	- Don't leave nodes dangling in order to keep track of the inode generation number. Free them back to the pool as soon as the referenced file becomes unused. Using arc4random() for the generation and ino_t based off the node's in-core address is just about as as good as a disk-based file system is going to give. - Add assertion to catch empty directories with linkcount > 1 being freed. This fires frequently but I haven't tracked the bug down yet.. - Use kmem_alloc.
1.26.4.1	21-Aug-2007	ad	- Add locking around tmpfs shared data structures and mark it MP safe. It's enough to last for about 45m of fsx+postmark, but it doesn't survive SGI fsstress yet. - Close a race where multiple vnodes could maybe have been allocated for a tmpnode with linkcount > 1.
1.28.2.6	26-Dec-2007	ad	Sync with head.
1.28.2.5	15-Dec-2007	ad	Fix accounting problem that allowed a tmpfs to be filled beyond its limit when running multithreaded.
1.28.2.4	13-Dec-2007	ad	Kill tn_lookup_dirent and find the correct node using the supplied componentname.
1.28.2.3	12-Dec-2007	ad	- Don't use LK_RETRY in tmpfs_alloc_vp(). - Reduce cosmetic diffs to head.
1.28.2.2	08-Dec-2007	ad	Reduce coverage of the per-mount lock by using atomic ops.
1.28.2.1	04-Dec-2007	ad	Pull the vmlocking changes into a new branch.
1.29.4.1	02-Jan-2008	bouyer	Sync with HEAD
1.32.10.3	11-Aug-2010	yamt	sync with head.
1.32.10.2	04-May-2009	yamt	sync with head.
1.32.10.1	16-May-2008	yamt	sync with head.
1.32.8.1	18-May-2008	yamt	sync with head.
1.32.6.3	28-Sep-2008	mjf	Sync with HEAD.
1.32.6.2	29-Jun-2008	mjf	Sync with HEAD.
1.32.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.33.4.4	31-Jul-2008	simonb	Sync with head.
1.33.4.3	29-Jul-2008	simonb	Sync with head.
1.33.4.2	28-Jul-2008	simonb	Sync with head.
1.33.4.1	27-Jun-2008	simonb	Sync with head.
1.33.2.2	18-Sep-2008	wrstuden	Sync with wrstuden-revivesa-base-2.
1.33.2.1	23-Jun-2008	wrstuden	Sync w/ -current. 34 merge conflicts to follow.
1.34.2.1	19-Oct-2008	haad	Sync with HEAD.
1.37.16.3	31-May-2011	rmind	sync with head
1.37.16.2	05-Mar-2011	rmind	sync with head
1.37.16.1	03-Jul-2010	rmind	sync with head
1.37.14.1	17-Aug-2010	uebayasi	Sync with HEAD.
1.39.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.45.16.1	18-May-2014	rmind	sync with head
1.45.12.2	03-Dec-2017	jdolecek	update from HEAD
1.45.12.1	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.45.2.1	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.48.2.1	10-Aug-2014	tls	Rebase.
1.50.4.3	28-Aug-2017	skrll	Sync with HEAD
1.50.4.2	05-Feb-2017	skrll	Sync with HEAD
1.50.4.1	22-Sep-2015	skrll	Sync with HEAD
1.52.4.1	21-Apr-2017	bouyer	Sync with HEAD
1.52.2.1	20-Mar-2017	pgoyette	Sync with HEAD
1.54.12.1	22-Apr-2018	pgoyette	Sync with HEAD
1.3	29-Jul-2008	pooka	branches: 1.3.2; 1.3.4; 1.3.6; 1.3.18; Solve the fstat-wants-to-look-at-kernel-data-structures in a nicer way: don't export the fs internals to innocent userspace programs which just want to mount the file system.
1.2	28-Jul-2008	pooka	shuffle around some more defs for fstat noticed by Kurt Schreiner on current-users
1.1	28-Jul-2008	pooka	branches: 1.1.2; Install mount argument structure header just like every other file system.
1.1.2.4	31-Jul-2008	simonb	Sync with head.
1.1.2.3	29-Jul-2008	simonb	Sync with head.
1.1.2.2	28-Jul-2008	simonb	Sync with head.
1.1.2.1	28-Jul-2008	simonb	file tmpfs_args.h was added on branch simonb-wapbl on 2008-07-28 14:37:35 +0000
1.3.18.2	04-May-2009	yamt	sync with head.
1.3.18.1	29-Jul-2008	yamt	file tmpfs_args.h was added on branch yamt-nfs-mp on 2009-05-04 08:13:44 +0000
1.3.6.2	19-Oct-2008	haad	Sync with HEAD.
1.3.6.1	29-Jul-2008	haad	file tmpfs_args.h was added on branch haad-dm on 2008-10-19 22:17:18 +0000
1.3.4.2	28-Sep-2008	mjf	Sync with HEAD.
1.3.4.1	29-Jul-2008	mjf	file tmpfs_args.h was added on branch mjf-devfs2 on 2008-09-28 10:40:50 +0000
1.3.2.2	18-Sep-2008	wrstuden	Sync with wrstuden-revivesa-base-2.
1.3.2.1	29-Jul-2008	wrstuden	file tmpfs_args.h was added on branch wrstuden-revivesa on 2008-09-18 04:36:55 +0000
1.15	19-Jul-2021	dholland	Abolish all the silly indirection macros for initializing vnode ops tables. These are things of the form #define foofs_op genfs_op, or #define foofs_op genfs_eopnotsupp, or similar. They serve no purpose besides obfuscation, and have gotten cutpasted all over everywhere. Part 2; cvs randomly didn't commit these changes before, and then hid them from me until I touched the files to force it to rethink. Dunno what happened. There's probably more of these, going to have to scan the tree the hard way.
1.14	18-Jul-2021	dholland	Use macros for the canned parts of device and fifo vnode op tables. Add GENFS_SPECOP_ENTRIES and GENFS_FIFOOP_ENTRIES macros that contain the portion of the vnode ops table declaration that is (conservatively) the same in every fs. Use these in every fs that supports devices and/or fifos with separate ops tables. Note that ptyfs works differently (it has one type of vnode with open-coded dispatch to the specfs code, which I haven't changed in this commit) and rump/librump/rumpvfs/rumpfs.c has an indirect dynamic dispatch that already does more or less the same thing, which I also haven't changed. Also note that this anticipates a few bits in the next changeset here and there, and adds missing but unreachable calls in some cases (e.g. most fses weren't defining whiteout on devices and fifos, but it isn't reachable there), and it changes parsepath on devices and fifos to genfs_badop from genfs_parsepath (but it's not reachable there either). It appears that devices in kernfs were missing kqfilter, so it's possible that if you try to use kqueue on /kern/rootdev that it'll explode. And finally note that the ops declaration tables aren't order-dependent. (Other than vop_default_desc has to come first.) Otherwise this wouldn't work.
1.13	29-Jun-2021	dholland	- Add a new vnode op: VOP_PARSEPATH. - Move namei_getcomponent to genfs_vnops.c and call it genfs_parsepath. - Add a parsepath entry to every vnode ops table. VOP_PARSEPATH takes a directory vnode to be searched and a complete following path and chooses how much of that path to consume. To begin with, all parsepath calls are genfs_parsepath, which locates the first '/' as always. Note that the call doesn't take the whole struct componentname, only the string. The other bits of struct componentname should not be needed and there's no reason to cause potential complications by exposing them.
1.12	16-May-2020	christos	branches: 1.12.6; Add ACL support for FFS. From FreeBSD.
1.11	25-Jul-2014	dholland	Add VOP_FALLOCATE and VOP_FDISCARD to every vnode ops table I can find. The filesystem ones all call genfs_eopnotsupp - right now I am only implementing the plumbing and we can implement fallocate and/or fdiscard for files later. The device ones call spec_fallocate (which is also genfs_eopnotsupp) and spec_fdiscard, which dispatches to the device-level op. The fifo ones all call vn_fifo_bypass, which also ends up being EOPNOTSUPP.
1.10	23-Nov-2013	rmind	branches: 1.10.2; - Simplify tmpfs_update(), eliminate tmpfs_note_t::tn_status and deferred timestamp updates. Fix some incorrect updates and plug some missing ones. Should fix PR/48385. - tmpfs_rmdir: avoid O(n) scan when the directory is not empty and whiteout entries were never added.
1.9	24-May-2011	rmind	branches: 1.9.4; 1.9.14; 1.9.18; - Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.8	19-Jun-2008	skd	branches: 1.8.18; 1.8.24; add arg so it will compile.
1.7	28-Apr-2008	martin	branches: 1.7.2; 1.7.4; Remove clause 3 and 4 from TNF licenses
1.6	25-Jan-2008	ad	branches: 1.6.6; 1.6.8; 1.6.10; Remove VOP_LEASE. Discussed on tech-kern.
1.5	11-Dec-2005	christos	branches: 1.5.18; 1.5.48; 1.5.54; merge ktrace-lwp.
1.4	02-Nov-2005	yamt	branches: 1.4.2; merge yamt-vop branch. remove following VOPs. VOP_BLKATOFF VOP_VALLOC VOP_BALLOC VOP_REALLOCBLKS VOP_VFREE VOP_TRUNCATE VOP_UPDATE
1.3	23-Sep-2005	jmmv	branches: 1.3.2; Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.2	10-Sep-2005	jmmv	wiz@ remembers that the preferred way to spell file-system in NetBSD is file system.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.3.2.2	29-Oct-2005	yamt	as tmpfs_update never fails, make it return void. suggested by Chuck Silvers.
1.3.2.1	20-Oct-2005	yamt	adapt tmpfs.
1.4.2.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.4.2.1	02-Nov-2005	skrll	file tmpfs_fifoops.c was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.5.54.1	18-Feb-2008	mjf	Sync with HEAD.
1.5.48.1	23-Mar-2008	matt	sync with HEAD
1.5.18.3	04-Feb-2008	yamt	sync with head.
1.5.18.2	21-Jun-2006	yamt	sync with head.
1.5.18.1	11-Dec-2005	yamt	file tmpfs_fifoops.c was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.6.10.2	04-May-2009	yamt	sync with head.
1.6.10.1	16-May-2008	yamt	sync with head.
1.6.8.1	18-May-2008	yamt	sync with head.
1.6.6.2	29-Jun-2008	mjf	Sync with HEAD.
1.6.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.7.4.1	27-Jun-2008	simonb	Sync with head.
1.7.2.1	23-Jun-2008	wrstuden	Sync w/ -current. 34 merge conflicts to follow.
1.8.24.1	06-Jun-2011	jruoho	Sync with HEAD.
1.8.18.1	31-May-2011	rmind	sync with head
1.9.18.1	18-May-2014	rmind	sync with head
1.9.14.1	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.9.4.1	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.10.2.1	10-Aug-2014	tls	Rebase.
1.12.6.1	01-Aug-2021	thorpej	Sync with HEAD.
1.9	18-Jul-2021	dholland	Abolish all the silly indirection macros for initializing vnode ops tables. These are things of the form #define foofs_op genfs_op, or #define foofs_op genfs_eopnotsupp, or similar. They serve no purpose besides obfuscation, and have gotten cutpasted all over everywhere.
1.8	24-May-2011	rmind	branches: 1.8.72; - Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.7	29-Mar-2010	pooka	branches: 1.7.2; Stop exposing fifofs internals and leave only fifo_vnodeop_p visible.
1.6	28-Apr-2008	martin	branches: 1.6.20; 1.6.22; Remove clause 3 and 4 from TNF licenses
1.5	25-Jan-2008	ad	branches: 1.5.6; 1.5.8; 1.5.10; Remove VOP_LEASE. Discussed on tech-kern.
1.4	03-Dec-2005	christos	branches: 1.4.18; 1.4.48; 1.4.54; - protect userland exported files against multiple inclusion. - make sure that kernel only files don't compile in userland using #error - XXX: some kernel only files still get installed. - XXX: some files used in userland, don't get installed.
1.3	02-Nov-2005	yamt	branches: 1.3.2; merge yamt-vop branch. remove following VOPs. VOP_BLKATOFF VOP_VALLOC VOP_BALLOC VOP_REALLOCBLKS VOP_VFREE VOP_TRUNCATE VOP_UPDATE
1.2	23-Sep-2005	jmmv	branches: 1.2.2; Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.2.2.1	20-Oct-2005	yamt	adapt tmpfs.
1.3.2.3	11-Dec-2005	christos	Sync with head.
1.3.2.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.3.2.1	02-Nov-2005	skrll	file tmpfs_fifoops.h was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.4.54.1	18-Feb-2008	mjf	Sync with HEAD.
1.4.48.1	23-Mar-2008	matt	sync with HEAD
1.4.18.3	04-Feb-2008	yamt	sync with head.
1.4.18.2	21-Jun-2006	yamt	sync with head.
1.4.18.1	03-Dec-2005	yamt	file tmpfs_fifoops.h was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.5.10.2	11-Aug-2010	yamt	sync with head.
1.5.10.1	16-May-2008	yamt	sync with head.
1.5.8.1	18-May-2008	yamt	sync with head.
1.5.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.6.22.2	31-May-2011	rmind	sync with head
1.6.22.1	30-May-2010	rmind	sync with head
1.6.20.1	30-Apr-2010	uebayasi	Sync with HEAD.
1.7.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.8.72.1	01-Aug-2021	thorpej	Sync with HEAD.
1.14	29-Apr-2023	riastradh	tmpfs: Nix trailing whitespace. No functional change intended.
1.13	11-Jun-2020	ad	uvm_availmem(): give it a boolean argument to specify whether a recent cached value will do, or if the very latest total must be fetched. It can be called thousands of times a second and fetching the totals impacts not only the calling LWP but other CPUs doing unrelated activity in the VM system.
1.12	31-Dec-2019	ad	Rename uvm_free() -> uvm_availmem().
1.11	21-Dec-2019	ad	uvmexp.free -> uvm_free()
1.10	13-Jul-2019	maxv	Remove the roundups, they are incorrect and cause memcmp to wrongfully fail because of uninitialized bytes at the end of the buffers. ok rmind@
1.9	22-Aug-2016	skrll	branches: 1.9.8; 1.9.16; Two fixes from rmind - tmpfs_node_get: restore (decrement) the node count on the error path. - tmpfs_bytes_max: save the value of uvmexp.freetarg (since it is unlocked/racy).
1.8	13-Jun-2014	pooka	branches: 1.8.4; use psize_t for physical memory calculation
1.7	10-Jun-2014	martin	Make sure to expand "freepages" to 64bit before shifting to byte values - on rump we may have all our virtual address space "free". Pointed out by pooka@.
1.6	07-Jun-2014	martin	Remove the hardcoded 4 MB free kernel memory limit and replace it by uvmexp.freetarg, as discussed on tech-kern. Main purpose is to make tmpfs usable (as far as possible) on small memory machines. This is a bit experimental, but we need to give it some real world exposure to see how well it works.
1.5	30-Apr-2014	christos	handle MNT_UPDATE
1.4	24-May-2011	rmind	branches: 1.4.4; 1.4.14; 1.4.18; 1.4.28; - tmpfs_alloc_node/tmpfs_free_node: move inode limiting into tmpfs_node_get() and tmpfs_node_put(), update outdated/wrong comments and move/add asserts. - tmpfs_mount: check for the version of arguments a bit earlier.
1.3	19-May-2011	rmind	- tmpfs: do not create dirent/node pools per-mount, there is no need to. - tmpfs_mount: fix a leak of mount structures in error path.
1.2	28-Jun-2010	rmind	branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8; tmpfs_bytes_max: use MIN() rather than min(), which returns int. Spotted by Wolfgang Solfrank.
1.1	22-Jun-2010	rmind	Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.2.8.1	06-Jun-2011	jruoho	Sync with HEAD.
1.2.6.2	17-Aug-2010	uebayasi	Sync with HEAD.
1.2.6.1	28-Jun-2010	uebayasi	file tmpfs_mem.c was added on branch uebayasi-xip on 2010-08-17 06:47:21 +0000
1.2.4.2	11-Aug-2010	yamt	sync with head.
1.2.4.1	28-Jun-2010	yamt	file tmpfs_mem.c was added on branch yamt-nfs-mp on 2010-08-11 22:54:36 +0000
1.2.2.3	31-May-2011	rmind	sync with head
1.2.2.2	03-Jul-2010	rmind	sync with head
1.2.2.1	28-Jun-2010	rmind	file tmpfs_mem.c was added on branch rmind-uvmplock on 2010-07-03 01:19:51 +0000
1.4.28.1	10-Aug-2014	tls	Rebase.
1.4.18.1	18-May-2014	rmind	sync with head
1.4.14.2	03-Dec-2017	jdolecek	update from HEAD
1.4.14.1	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.4.4.1	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.8.4.1	05-Oct-2016	skrll	Sync with HEAD
1.9.16.2	13-Apr-2020	martin	Mostly merge changes from HEAD upto 20200411
1.9.16.1	08-Apr-2020	martin	Merge changes from current as of 20200406
1.9.8.1	04-Aug-2019	martin	Pull up following revision(s) (requested by maxv in ticket #1321): sys/fs/tmpfs/tmpfs_mem.c: revision 1.10 Remove the roundups, they are incorrect and cause memcmp to wrongfully fail because of uninitialized bytes at the end of the buffers. ok rmind@
1.15	22-Jun-2010	rmind	Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.14	28-Apr-2008	martin	branches: 1.14.20; 1.14.22; Remove clause 3 and 4 from TNF licenses
1.13	06-Feb-2008	jmmv	branches: 1.13.6; 1.13.8; 1.13.10; u_int is not a C99 standard type, so spell it out completely as unsigned int.
1.12	02-Jan-2008	ad	Merge vmlocking2 to head.
1.11	22-Nov-2007	pooka	branches: 1.11.2; 1.11.6; Don't KASSERT that the pool allocator returns a page - it might be called with NOWAIT. XXX: this is just a quick fix to stop the diagnostic panic. I think ENOSPC should be treated elsewhere depending on how much memory tmpfs claims.
1.10	10-Nov-2007	ad	Back out the tmpfs changes; there appears to be a bug lurking.
1.9	06-Nov-2007	ad	Merge from vmlocking.
1.8	23-Oct-2007	dyoung	branches: 1.8.2; Put _tmpfs_ in the name of the pools instead of _pool_. Obviously they're pools; it's not so obvious that they come from tmpfs. :-)
1.7	12-Mar-2007	ad	branches: 1.7.12; 1.7.14; 1.7.18; Pass an ipl argument to pool_init/POOL_INIT to be used when initializing the pool's lock.
1.6	09-Nov-2006	jmmv	branches: 1.6.2; 1.6.4; 1.6.8; 1.6.10; Add 2006 to the copyright notice; should have done this when touching the files before.
1.5	03-Sep-2006	christos	branches: 1.5.2; 1.5.4; use c99 initializers
1.4	11-Dec-2005	christos	branches: 1.4.4; 1.4.8; 1.4.18; merge ktrace-lwp.
1.3	23-Sep-2005	jmmv	branches: 1.3.6; Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.2	12-Sep-2005	yamt	- don't keep a reference to a variable on stack. - remove a meaningless assumption about the order of structure members.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.3.6.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.3.6.1	23-Sep-2005	skrll	file tmpfs_pool.c was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.4.18.8	11-Feb-2008	yamt	sync with head.
1.4.18.7	21-Jan-2008	yamt	sync with head
1.4.18.6	07-Dec-2007	yamt	sync with head
1.4.18.5	27-Oct-2007	yamt	sync with head.
1.4.18.4	03-Sep-2007	yamt	sync with head.
1.4.18.3	30-Dec-2006	yamt	sync with head.
1.4.18.2	21-Jun-2006	yamt	sync with head.
1.4.18.1	11-Dec-2005	yamt	file tmpfs_pool.c was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.4.8.1	03-Sep-2006	yamt	sync with head.
1.4.4.1	09-Sep-2006	rpaulo	sync with head
1.5.4.1	10-Dec-2006	yamt	sync with head.
1.5.2.1	18-Nov-2006	ad	Sync with head.
1.6.10.1	03-Jun-2008	skrll	Sync with netbsd-4.
1.6.8.4	08-Oct-2007	ad	- Don't leave nodes dangling in order to keep track of the inode generation number. Free them back to the pool as soon as the referenced file becomes unused. Using arc4random() for the generation and ino_t based off the node's in-core address is just about as as good as a disk-based file system is going to give. - Add assertion to catch empty directories with linkcount > 1 being freed. This fires frequently but I haven't tracked the bug down yet.. - Use kmem_alloc.
1.6.8.3	18-Sep-2007	ad	tmpfs_pool_page_alloc: - If we can't allocate a page, just return NULL instead of panicing. - Specify PR_NOWAIT to the back-end allocator. This is a bit risky since we are relying on the results of a stale check that there is free memory, but for now it's better than failing allocations because another thread has kernel_map locked.
1.6.8.2	21-Aug-2007	ad	- Add locking around tmpfs shared data structures and mark it MP safe. It's enough to last for about 45m of fsx+postmark, but it doesn't survive SGI fsstress yet. - Close a race where multiple vnodes could maybe have been allocated for a tmpnode with linkcount > 1.
1.6.8.1	13-Mar-2007	ad	Sync with head.
1.6.4.1	24-Mar-2007	yamt	sync with head.
1.6.2.1	01-Feb-2008	riz	Pull up following revision(s) (requested by pooka in ticket #1008): sys/fs/tmpfs/tmpfs_pool.c: revision 1.11 Don't KASSERT that the pool allocator returns a page - it might be called with NOWAIT. XXX: this is just a quick fix to stop the diagnostic panic. I think ENOSPC should be treated elsewhere depending on how much memory tmpfs claims.
1.7.18.1	13-Nov-2007	bouyer	Sync with HEAD
1.7.14.4	23-Mar-2008	matt	sync with HEAD
1.7.14.3	09-Jan-2008	matt	sync with HEAD
1.7.14.2	08-Nov-2007	matt	sync with -HEAD
1.7.14.1	06-Nov-2007	matt	sync with HEAD
1.7.12.4	27-Nov-2007	joerg	Sync with HEAD. amd64 Xen support needs testing.
1.7.12.3	11-Nov-2007	joerg	Sync with HEAD.
1.7.12.2	06-Nov-2007	joerg	Sync with HEAD.
1.7.12.1	26-Oct-2007	joerg	Sync with HEAD. Follow the merge of pmap.c on i386 and amd64 and move pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup code to restore CR4 before jumping back into kernel space as the large page option might cover that.
1.8.2.3	18-Feb-2008	mjf	Sync with HEAD.
1.8.2.2	08-Dec-2007	mjf	Sync with HEAD.
1.8.2.1	19-Nov-2007	mjf	Sync with HEAD.
1.11.6.1	02-Jan-2008	bouyer	Sync with HEAD
1.11.2.5	15-Dec-2007	ad	Fix accounting problem that allowed a tmpfs to be filled beyond its limit when running multithreaded.
1.11.2.4	12-Dec-2007	ad	Minor corrections to previous.
1.11.2.3	12-Dec-2007	ad	- Don't use LK_RETRY in tmpfs_alloc_vp(). - Reduce cosmetic diffs to head.
1.11.2.2	08-Dec-2007	ad	Reduce coverage of the per-mount lock by using atomic ops.
1.11.2.1	04-Dec-2007	ad	Pull the vmlocking changes into a new branch.
1.13.10.2	11-Aug-2010	yamt	sync with head.
1.13.10.1	16-May-2008	yamt	sync with head.
1.13.8.1	18-May-2008	yamt	sync with head.
1.13.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.14.22.1	03-Jul-2010	rmind	sync with head
1.14.20.2	17-Aug-2010	uebayasi	Sync with HEAD.
1.14.20.1	17-Aug-2010	uebayasi	Sync with HEAD.
1.8	22-Jun-2010	rmind	Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.7	28-Apr-2008	martin	branches: 1.7.20; 1.7.22; Remove clause 3 and 4 from TNF licenses
1.6	09-Nov-2006	jmmv	branches: 1.6.48; 1.6.50; 1.6.52; Add 2006 to the copyright notice; should have done this when touching the files before.
1.5	10-Feb-2006	christos	branches: 1.5.12; 1.5.16; 1.5.18; make the include files usable from userland.
1.4	03-Dec-2005	christos	branches: 1.4.2; 1.4.4; 1.4.6; - protect userland exported files against multiple inclusion. - make sure that kernel only files don't compile in userland using #error - XXX: some kernel only files still get installed. - XXX: some files used in userland, don't get installed.
1.3	23-Sep-2005	jmmv	branches: 1.3.6; Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.2	12-Sep-2005	yamt	- don't keep a reference to a variable on stack. - remove a meaningless assumption about the order of structure members.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.3.6.3	11-Dec-2005	christos	Sync with head.
1.3.6.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.3.6.1	23-Sep-2005	skrll	file tmpfs_pool.h was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.4.6.1	22-Apr-2006	simonb	Sync with head.
1.4.4.1	09-Sep-2006	rpaulo	sync with head
1.4.2.1	18-Feb-2006	yamt	sync with head.
1.5.18.1	10-Dec-2006	yamt	sync with head.
1.5.16.1	18-Nov-2006	ad	Sync with head.
1.5.12.3	30-Dec-2006	yamt	sync with head.
1.5.12.2	21-Jun-2006	yamt	sync with head.
1.5.12.1	10-Feb-2006	yamt	file tmpfs_pool.h was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.6.52.2	11-Aug-2010	yamt	sync with head.
1.6.52.1	16-May-2008	yamt	sync with head.
1.6.50.1	18-May-2008	yamt	sync with head.
1.6.48.1	02-Jun-2008	mjf	Sync with HEAD.
1.7.22.1	03-Jul-2010	rmind	sync with head
1.7.20.2	17-Aug-2010	uebayasi	Sync with HEAD.
1.7.20.1	17-Aug-2010	uebayasi	Sync with HEAD.
1.12	20-Oct-2021	thorpej	Move a mis-placed KASSERT().
1.11	20-Oct-2021	thorpej	Overhaul of the EVFILT_VNODE kevent(2) filter: - Centralize vnode kevent handling in the VOP_() wrappers, rather than forcing each individual file system to deal with it (except VOP_RENAME(), because VOP_RENAME() is a mess and we currently have 2 different ways of handling it; at least it's reasonably well-centralized in the "new" way). - Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ, compatible with the same events in FreeBSD. - Track which kevent notifications clients are interested in receiving to avoid doing work for events no one cares about (avoiding, e.g. taking locks and traversing the klist to send a NOTE_WRITE when someone is merely watching for a file to be deleted, for example). In support of the above: - Add support in vnode_if.sh for specifying PRE- and POST-op handlers, to be invoked before and after vop_pre() and vop_post(), respectively. Basic idea from FreeBSD, but implemented differently. - Add support in vnode_if.sh for specifying CONTEXT fields in the vop__args structures. These context fields are used to convey information between the file system VOP function and the VOP wrapper, but do not occupy an argument slot in the VOP_*() call itself. These context fields are initialized and subsequently interpreted by PRE- and POST-op handlers. - Version VOP_REMOVE(), uses the a context field for the file system to report back the resulting link count of the target vnode. Return this in tmpfs, udf, nfs, chfs, ext2fs, lfs, and ufs. NetBSD 9.99.92.
1.10	03-Dec-2019	riastradh	Omit obsolete comment and needless __diagused marker.
1.9	14-Jul-2019	maxv	Fix uninitialized variable: if 'tvp' is NULL, '*tdep' is not initialized. This could have caused the KASSERT to wrongfully fire. ok riastradh@
1.8	06-Jul-2015	wiz	branches: 1.8.10; 1.8.18; Fix typo in comment.
1.7	06-Jul-2015	hannken	Change tmpfs to vcache. - Use tmpfs node address as key. - Remove tn_vlock, field tn_vnode now protected by vcache. - Add a hold count to tmpfs node to prevent nodes from disappearing while tmpfs_fhtovp() trys to vcache_get() them. Last holder destroys reclaimed nodes. - Remove the now unneeded parent unlock/lock for lookup of '..'.
1.6	23-Nov-2013	rmind	branches: 1.6.6; - Simplify tmpfs_update(), eliminate tmpfs_note_t::tn_status and deferred timestamp updates. Fix some incorrect updates and plug some missing ones. Should fix PR/48385. - tmpfs_rmdir: avoid O(n) scan when the directory is not empty and whiteout entries were never added.
1.5	08-Nov-2013	rmind	tmpfs: replace the broken tmpfs_dircookie() logic which uses the node address truncated to 31 bits (required for 32-bit readdir compatibility, e.g. linux32). Instead, assign 2^31 range using the following logic: - The first half of the 2^31 is assigned incrementally (the fast path). - When exceeded, use the second half of 2^31, but manage with vmem(9). It will require 2 billion files per-directory to trigger vmem(9) usage. Also, while here, add some fixes for tmpfs_unmount(). Should fix PR/47739, PR/47480, PR/46088 and PR/41068. Thanks to wiz@ for stress testing.
1.4	27-Sep-2012	riastradh	branches: 1.4.2; Uncomment call to genfs_rename_cache_purge. Fixes a side issue mentioned in PR kern/46990. I left this commented to preserve the old behaviour of tmpfs_rename, but it is obviously broken to omit the cache purge, and I'm surprised nobody had encountered any problems with it until now.
1.3	25-Sep-2012	riastradh	Check tmpfs_rmdired_p after tmpfs_vnode_get when walking up the tree. tmpfs_vnode_get drops all locks except possibly the reclaiming bit lock to keep the tmpfs node from being reclaimed while we're still interested in it. Consequently, it does not keep the directory's existence invariant, so we must check that after tmpfs_vnode_get. Fixes PR kern/46990. Tested by Wolfgang Stukenbrock.
1.2	09-May-2012	riastradh	branches: 1.2.2; 1.2.4; 1.2.6; Fix omitted VN_KNOTE(fvp, NOTE_RENAME) in tmpfs_rename. Missed that line while refactoring tmpfs_rename to use genfs_rename.
1.1	09-May-2012	riastradh	Adapt tmpfs_rename to use genfs_rename.
1.2.6.3	03-Dec-2017	jdolecek	update from HEAD
1.2.6.2	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.2.6.1	20-Nov-2012	tls	Resync to 2012-11-19 00:00:00 UTC
1.2.4.2	02-Jun-2012	mrg	sync to latest -current.
1.2.4.1	09-May-2012	mrg	file tmpfs_rename.c was added on branch jmcneill-usbmp on 2012-06-02 11:09:32 +0000
1.2.2.4	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.2.2.3	30-Oct-2012	yamt	sync with head
1.2.2.2	23-May-2012	yamt	sync with head.
1.2.2.1	09-May-2012	yamt	file tmpfs_rename.c was added on branch yamt-pagecache on 2012-05-23 10:08:09 +0000
1.4.2.1	18-May-2014	rmind	sync with head
1.6.6.1	22-Sep-2015	skrll	Sync with HEAD
1.8.18.2	13-Apr-2020	martin	Mostly merge changes from HEAD upto 20200411
1.8.18.1	08-Apr-2020	martin	Merge changes from current as of 20200406
1.8.10.1	29-Aug-2019	martin	Pull up following revision(s) (requested by maxv in ticket #1345): sys/fs/tmpfs/tmpfs_rename.c: revision 1.9 Fix uninitialized variable: if 'tvp' is NULL, '*tdep' is not initialized. This could have caused the KASSERT to wrongfully fire. ok riastradh@
1.16	19-Jul-2021	dholland	Abolish all the silly indirection macros for initializing vnode ops tables. These are things of the form #define foofs_op genfs_op, or #define foofs_op genfs_eopnotsupp, or similar. They serve no purpose besides obfuscation, and have gotten cutpasted all over everywhere. Part 2; cvs randomly didn't commit these changes before, and then hid them from me until I touched the files to force it to rethink. Dunno what happened. There's probably more of these, going to have to scan the tree the hard way.
1.15	18-Jul-2021	dholland	Use macros for the canned parts of device and fifo vnode op tables. Add GENFS_SPECOP_ENTRIES and GENFS_FIFOOP_ENTRIES macros that contain the portion of the vnode ops table declaration that is (conservatively) the same in every fs. Use these in every fs that supports devices and/or fifos with separate ops tables. Note that ptyfs works differently (it has one type of vnode with open-coded dispatch to the specfs code, which I haven't changed in this commit) and rump/librump/rumpvfs/rumpfs.c has an indirect dynamic dispatch that already does more or less the same thing, which I also haven't changed. Also note that this anticipates a few bits in the next changeset here and there, and adds missing but unreachable calls in some cases (e.g. most fses weren't defining whiteout on devices and fifos, but it isn't reachable there), and it changes parsepath on devices and fifos to genfs_badop from genfs_parsepath (but it's not reachable there either). It appears that devices in kernfs were missing kqfilter, so it's possible that if you try to use kqueue on /kern/rootdev that it'll explode. And finally note that the ops declaration tables aren't order-dependent. (Other than vop_default_desc has to come first.) Otherwise this wouldn't work.
1.14	29-Jun-2021	dholland	- Add a new vnode op: VOP_PARSEPATH. - Move namei_getcomponent to genfs_vnops.c and call it genfs_parsepath. - Add a parsepath entry to every vnode ops table. VOP_PARSEPATH takes a directory vnode to be searched and a complete following path and chooses how much of that path to consume. To begin with, all parsepath calls are genfs_parsepath, which locates the first '/' as always. Note that the call doesn't take the whole struct componentname, only the string. The other bits of struct componentname should not be needed and there's no reason to cause potential complications by exposing them.
1.13	16-May-2020	christos	branches: 1.13.6; Add ACL support for FFS. From FreeBSD.
1.12	25-Jul-2014	dholland	Add VOP_FALLOCATE and VOP_FDISCARD to every vnode ops table I can find. The filesystem ones all call genfs_eopnotsupp - right now I am only implementing the plumbing and we can implement fallocate and/or fdiscard for files later. The device ones call spec_fallocate (which is also genfs_eopnotsupp) and spec_fdiscard, which dispatches to the device-level op. The fifo ones all call vn_fifo_bypass, which also ends up being EOPNOTSUPP.
1.11	23-Nov-2013	rmind	branches: 1.11.2; - Simplify tmpfs_update(), eliminate tmpfs_note_t::tn_status and deferred timestamp updates. Fix some incorrect updates and plug some missing ones. Should fix PR/48385. - tmpfs_rmdir: avoid O(n) scan when the directory is not empty and whiteout entries were never added.
1.10	24-May-2011	rmind	branches: 1.10.4; 1.10.14; 1.10.18; - Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.9	20-Jun-2008	skd	branches: 1.9.18; 1.9.24; add NULL arg so it will compile.
1.8	28-Apr-2008	martin	branches: 1.8.2; 1.8.4; Remove clause 3 and 4 from TNF licenses
1.7	25-Jan-2008	ad	branches: 1.7.6; 1.7.8; 1.7.10; Remove VOP_LEASE. Discussed on tech-kern.
1.6	11-Dec-2005	christos	branches: 1.6.18; 1.6.48; 1.6.54; merge ktrace-lwp.
1.5	02-Nov-2005	yamt	branches: 1.5.2; merge yamt-vop branch. remove following VOPs. VOP_BLKATOFF VOP_VALLOC VOP_BALLOC VOP_REALLOCBLKS VOP_VFREE VOP_TRUNCATE VOP_UPDATE
1.4	02-Nov-2005	dyoung	Bug fix: correct the sense of an if-condition in tmpfs_spec_close: because VOP_UPDATE() usually succeeded, spec_close() was not usually called. Only skip the spec_close() step if VOP_UPDATE() returns an error result. Now /dev/watchdog works as expected when /dev/ is a tmpfs; previously, it was impossible to disarm a user-tickled watchdog.
1.3	23-Sep-2005	jmmv	branches: 1.3.2; Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.2	10-Sep-2005	jmmv	wiz@ remembers that the preferred way to spell file-system in NetBSD is file system.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.3.2.3	02-Nov-2005	yamt	sync with head.
1.3.2.2	29-Oct-2005	yamt	as tmpfs_update never fails, make it return void. suggested by Chuck Silvers.
1.3.2.1	20-Oct-2005	yamt	adapt tmpfs.
1.5.2.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.5.2.1	02-Nov-2005	skrll	file tmpfs_specops.c was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.6.54.1	18-Feb-2008	mjf	Sync with HEAD.
1.6.48.1	23-Mar-2008	matt	sync with HEAD
1.6.18.3	04-Feb-2008	yamt	sync with head.
1.6.18.2	21-Jun-2006	yamt	sync with head.
1.6.18.1	11-Dec-2005	yamt	file tmpfs_specops.c was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.7.10.2	04-May-2009	yamt	sync with head.
1.7.10.1	16-May-2008	yamt	sync with head.
1.7.8.1	18-May-2008	yamt	sync with head.
1.7.6.2	29-Jun-2008	mjf	Sync with HEAD.
1.7.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.8.4.1	27-Jun-2008	simonb	Sync with head.
1.8.2.1	23-Jun-2008	wrstuden	Sync w/ -current. 34 merge conflicts to follow.
1.9.24.1	06-Jun-2011	jruoho	Sync with HEAD.
1.9.18.1	31-May-2011	rmind	sync with head
1.10.18.1	18-May-2014	rmind	sync with head
1.10.14.1	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.10.4.1	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.11.2.1	10-Aug-2014	tls	Rebase.
1.13.6.1	01-Aug-2021	thorpej	Sync with HEAD.
1.9	18-Jul-2021	dholland	Abolish all the silly indirection macros for initializing vnode ops tables. These are things of the form #define foofs_op genfs_op, or #define foofs_op genfs_eopnotsupp, or similar. They serve no purpose besides obfuscation, and have gotten cutpasted all over everywhere.
1.8	24-May-2011	rmind	branches: 1.8.72; - Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.7	28-Apr-2008	martin	branches: 1.7.22; 1.7.28; Remove clause 3 and 4 from TNF licenses
1.6	25-Jan-2008	ad	branches: 1.6.6; 1.6.8; 1.6.10; Remove VOP_LEASE. Discussed on tech-kern.
1.5	03-Dec-2005	christos	branches: 1.5.18; 1.5.48; 1.5.54; - protect userland exported files against multiple inclusion. - make sure that kernel only files don't compile in userland using #error - XXX: some kernel only files still get installed. - XXX: some files used in userland, don't get installed.
1.4	02-Nov-2005	yamt	branches: 1.4.2; merge yamt-vop branch. remove following VOPs. VOP_BLKATOFF VOP_VALLOC VOP_BALLOC VOP_REALLOCBLKS VOP_VFREE VOP_TRUNCATE VOP_UPDATE
1.3	02-Nov-2005	dyoung	Bug fix: change tmpfs_spec_bwrite from tmpfs_bwrite to vn_bwrite, per yamt's suggestion. Previously, if /dev/ was mounted on a tmpfs, block device buffers were never flushed to disk. Trying to unmount a dirty filesystem (umount /dev/wd0e, say) caused an endless stream of vflushbuf warnings, because tmpfs_bwrite was not flushing buffers. The fix told to me by yamt solves the problem.
1.2	23-Sep-2005	jmmv	branches: 1.2.2; Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.2.2.2	02-Nov-2005	yamt	sync with head.
1.2.2.1	20-Oct-2005	yamt	adapt tmpfs.
1.4.2.3	11-Dec-2005	christos	Sync with head.
1.4.2.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.4.2.1	02-Nov-2005	skrll	file tmpfs_specops.h was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.5.54.1	18-Feb-2008	mjf	Sync with HEAD.
1.5.48.1	23-Mar-2008	matt	sync with HEAD
1.5.18.3	04-Feb-2008	yamt	sync with head.
1.5.18.2	21-Jun-2006	yamt	sync with head.
1.5.18.1	03-Dec-2005	yamt	file tmpfs_specops.h was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.6.10.1	16-May-2008	yamt	sync with head.
1.6.8.1	18-May-2008	yamt	sync with head.
1.6.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.7.28.1	06-Jun-2011	jruoho	Sync with HEAD.
1.7.22.1	31-May-2011	rmind	sync with head
1.8.72.1	01-Aug-2021	thorpej	Sync with HEAD.
1.117	29-Apr-2023	riastradh	tmpfs: Assert no arithmetic overflow in directory node tn_size. Need >2^57 directory entries before this is a problem. If we created a million per second, this would take over 4000 years.
1.116	29-Apr-2023	riastradh	tmpfs: Refuse sizes that overflow round_page. Reported-by: syzbot+8dbeee84de15f86df65b@syzkaller.appspotmail.com https://syzkaller.appspot.com/bug?id=4a27b9fe074f8d4b0afbe22969339b8dfdb157e8
1.115	29-Apr-2023	riastradh	tmpfs: Nix trailing whitespace. No functional change intended.
1.114	20-Oct-2021	thorpej	branches: 1.114.4; Overhaul of the EVFILT_VNODE kevent(2) filter: - Centralize vnode kevent handling in the VOP_() wrappers, rather than forcing each individual file system to deal with it (except VOP_RENAME(), because VOP_RENAME() is a mess and we currently have 2 different ways of handling it; at least it's reasonably well-centralized in the "new" way). - Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ, compatible with the same events in FreeBSD. - Track which kevent notifications clients are interested in receiving to avoid doing work for events no one cares about (avoiding, e.g. taking locks and traversing the klist to send a NOTE_WRITE when someone is merely watching for a file to be deleted, for example). In support of the above: - Add support in vnode_if.sh for specifying PRE- and POST-op handlers, to be invoked before and after vop_pre() and vop_post(), respectively. Basic idea from FreeBSD, but implemented differently. - Add support in vnode_if.sh for specifying CONTEXT fields in the vop__args structures. These context fields are used to convey information between the file system VOP function and the VOP wrapper, but do not occupy an argument slot in the VOP_*() call itself. These context fields are initialized and subsequently interpreted by PRE- and POST-op handlers. - Version VOP_REMOVE(), uses the a context field for the file system to report back the resulting link count of the target vnode. Return this in tmpfs, udf, nfs, chfs, ext2fs, lfs, and ufs. NetBSD 9.99.92.
1.113	05-Sep-2020	riastradh	Round of uvm.h cleanup. The poorly named uvm.h is generally supposed to be for uvm-internal users only. - Narrow it to files that actually need it -- mostly files that need to query whether curlwp is the pagedaemon, which should maybe be exposed by an external header. - Use uvm_extern.h where feasible and uvm_*.h for things not exposed by it. We should split up uvm_extern.h but this will serve for now to reduce the uvm.h dependencies. - Use uvm_stat.h and #ifdef UVMHIST uvm.h for files that use UVMHIST(ubchist), since ubchist is declared in uvm.h but the reference evaporates if UVMHIST is not defined, so we reduce header file dependencies. - Make uvm_device.h and uvm_swap.h independently includable while here. ok chs@
1.112	17-May-2020	ad	PR kern/55268: tmpfs is slow tmpfs_getpages(): handle the PGO_LOCKED case and implement lazy update of atime/mtime.
1.111	16-May-2020	christos	Add ACL support for FFS. From FreeBSD.
1.110	12-May-2020	ad	cache_enter_id(): give it a boolean parameter to indicate whether the cached identity is valid.
1.109	23-Apr-2020	ad	PR kern/54759 (vm.ubc_direct deadlock when read()/write() into mapping of itself) - Add new flag UBC_ISMAPPED which tells ubc_uiomove() the object is mmap()ed somewhere. Use it to decide whether to do direct-mapped copy, rather than poking around directly in the vnode in ubc_uiomove(), which is ugly and doesn't work for tmpfs. It would be nicer to contain all this in UVM but the filesystem provides the needed locking here (VV_MAPPED) and to reinvent that would suck more. - Rename UBC_UNMAP_FLAG() to UBC_VNODE_FLAGS(). Pass in UBC_ISMAPPED where appropriate.
1.108	04-Apr-2020	ad	branches: 1.108.2; Merge the remaining changes from the ad-namecache branch, affecting namei() and getcwd(): - push vnode locking back as far as possible. - do most lookups directly in the namecache, avoiding vnode locks & refs. - don't block new refs to vnodes across VOP_INACTIVE(). - get shared locks for VOP_LOOKUP() if the file system supports it. - correct lock types for VOP_ACCESS() / VOP_GETATTR() in a few places. Possible future enhancements: - make the lookups lockless. - support dotdot lookups by being lockless and inferring absence of chroot. - maybe make it work for layered file systems. - avoid vnode references at the root & cwd.
1.107	14-Mar-2020	ad	tmpfs_reg_resize(): do nothing if newsize == oldsize.
1.106	23-Feb-2020	ad	UVM locking changes, proposed on tech-kern: - Change the lock on uvm_object, vm_amap and vm_anon to be a RW lock. - Break v_interlock and vmobjlock apart. v_interlock remains a mutex. - Do partial PV list locking in the x86 pmap. Others to follow later.
1.105	18-Sep-2019	christos	branches: 1.105.2; Add newly created vnodes to the namei cache. The rest of the filesystems already did that (or they don't support writing). Discussed in tech-kern.
1.104	01-Jan-2019	hannken	branches: 1.104.4; Add "void *extra" argument to vcache_new() so a file system may pass more information about the file to create. Welcome to 8.99.30
1.103	28-May-2018	chs	branches: 1.103.2; allow tmpfs files to be larger than 4GB.
1.102	04-Jan-2017	hannken	branches: 1.102.8; 1.102.14; Change tmpfs_chsize() to update mtime etc. even if "length == node->tn_size". Adresses PR kern/51762 "mtime not updated by open(O_TRUNC)"
1.101	29-Oct-2015	leot	branches: 1.101.2; Make sure that nde->td_node is NULL for asserts. Thanks and from Mindaugas Rasiukevicius. Fixes PR kern/50381.
1.100	07-Jul-2015	justin	This enum is likely to be made unsigned by the compiler, so the assertion will not work and clang objects with -Wtautological-constant-out-of-range-compare
1.99	06-Jul-2015	hannken	Change tmpfs to vcache. - Use tmpfs node address as key. - Remove tn_vlock, field tn_vnode now protected by vcache. - Add a hold count to tmpfs node to prevent nodes from disappearing while tmpfs_fhtovp() trys to vcache_get() them. Last holder destroys reclaimed nodes. - Remove the now unneeded parent unlock/lock for lookup of '..'.
1.98	20-Apr-2015	riastradh	Make vget always return vnode unlocked. Convert callers who want locks to use vn_lock afterward. Add extra argument so the compiler will report stragglers.
1.97	08-Sep-2014	gson	branches: 1.97.2; Store symlinks without a NUL terminator so that lstat(2) returns the correct length. Fixes the tmpfs part of PR kern/48864.
1.96	23-Jan-2014	hannken	branches: 1.96.4; Change vnode operations create, mknod, mkdir and symlink to return the resulting vnode *vpp unlocked. Discussed on tech-kern@ Welcome to 6.99.30
1.95	17-Jan-2014	hannken	Change vnode operations create, mknod, mkdir and symlink to keep the directory node dvp locked on return. Discussed on tech-kern@ Welcome to 6.99.29
1.94	08-Jan-2014	pedro	Allocate direntp on the stack in tmpfs_dir_getdents(), thus saving calls to kmem_zalloc() and kmem_free(); OK rmind@. From OpenBSD.
1.93	03-Jan-2014	hannken	Fix a race where thread1 runs VOP_REMOVE() and gets preempted in tmpfs_reclaim() before the call to tmpfs_free_node(). Thread2 runs VFS_FHTOVP() and gets a new vnode attached to the node thread1 is about to destroy. Change tmpfs_alloc_node() to always assign non-zero generation number and tmpfs_inactive() to set the generation number of unlinked nodes to zero.
1.92	24-Nov-2013	rmind	- tmpfs_construct_node: prevent from the new node construction if the directory was removed. Fixes the crash reported by Nicolas Joly. - tmpfs_reclaim: avoid race by checking tn_links with the vnode locked.
1.91	23-Nov-2013	rmind	tmpfs_reg_resize: use size_t.
1.90	23-Nov-2013	rmind	- Simplify tmpfs_update(), eliminate tmpfs_note_t::tn_status and deferred timestamp updates. Fix some incorrect updates and plug some missing ones. Should fix PR/48385. - tmpfs_rmdir: avoid O(n) scan when the directory is not empty and whiteout entries were never added.
1.89	21-Nov-2013	rmind	tmpfs_dir_getdotents: fix the recent regression, set the correct d_fileno value for dot-dot. Spotted by Pedro Martelletto, thanks!
1.88	18-Nov-2013	rmind	Make tmpfs_node_t::tn_gen a 32-bit number, keep it in sync with tmpfs_fid_t. Also, change tn_status to unsigned while here.
1.87	16-Nov-2013	rmind	tmpfs_dir_getdents: avoid leaking kernel memory to the userspace. From Pedro Martelletto. XXX: regress/sys/fs/getdents should be a part of the test suite
1.86	11-Nov-2013	rmind	tmpfs_alloc_node: use cprng_fast64(), the old random(9) shall be removed.
1.85	10-Nov-2013	rmind	Handle whiteout case in tmpfs_dir_detach() and tmpfs_unmount().
1.84	10-Nov-2013	christos	mark variable __diagused
1.83	08-Nov-2013	rmind	tmpfs: replace the broken tmpfs_dircookie() logic which uses the node address truncated to 31 bits (required for 32-bit readdir compatibility, e.g. linux32). Instead, assign 2^31 range using the following logic: - The first half of the 2^31 is assigned incrementally (the fast path). - When exceeded, use the second half of 2^31, but manage with vmem(9). It will require 2 billion files per-directory to trigger vmem(9) usage. Also, while here, add some fixes for tmpfs_unmount(). Should fix PR/47739, PR/47480, PR/46088 and PR/41068. Thanks to wiz@ for stress testing.
1.82	01-Nov-2013	rmind	tmpfs: fix the zero-length symlink target case as NetBSD supports them.
1.81	31-Oct-2013	rmind	tmpfs_alloc_node: it is less error-prone to store the link path with the NIL terminator included. Adjust tmpfs_readlink() to exclude NIL. Also, remove the check for zero-length and add some asserts.
1.80	04-Oct-2013	rmind	- tmpfs_remove: check 'appendable' flag for the parent directory as well. Patch from Pedro Martelletto. - tmpfs_dir_detach: remove missleading check. - tmpfs_link: remove unused variable.
1.79	13-Mar-2012	elad	branches: 1.79.2; 1.79.4; Replace the remaining KAUTH_GENERIC_ISSUSER authorization calls with something meaningful. All relevant documentation has been updated or written. Most of these changes were brought up in the following messages: http://mail-index.netbsd.org/tech-kern/2012/01/18/msg012490.html http://mail-index.netbsd.org/tech-kern/2012/01/19/msg012502.html http://mail-index.netbsd.org/tech-kern/2012/02/17/msg012728.html Thanks to christos, manu, njoly, and jmmv for input. Huge thanks to pgoyette for spinning these changes through some build cycles and ATF.
1.78	19-Nov-2011	tls	branches: 1.78.2; First step of random number subsystem rework described in <20111022023242.BA26F14A158@mail.netbsd.org>. This change includes the following: An initial cleanup and minor reorganization of the entropy pool code in sys/dev/rnd.c and sys/dev/rndpool.c. Several bugs are fixed. Some effort is made to accumulate entropy more quickly at boot time. A generic interface, "rndsink", is added, for stream generators to request that they be re-keyed with good quality entropy from the pool as soon as it is available. The arc4random()/arc4randbytes() implementation in libkern is adjusted to use the rndsink interface for rekeying, which helps address the problem of low-quality keys at boot time. An implementation of the FIPS 140-2 statistical tests for random number generator quality is provided (libkern/rngtest.c). This is based on Greg Rose's implementation from Qualcomm. A new random stream generator, nist_ctr_drbg, is provided. It is based on an implementation of the NIST SP800-90 CTR_DRBG by Henric Jungheim. This generator users AES in a modified counter mode to generate a backtracking-resistant random stream. An abstraction layer, "cprng", is provided for in-kernel consumers of randomness. The arc4random/arc4randbytes API is deprecated for in-kernel use. It is replaced by "cprng_strong". The current cprng_fast implementation wraps the existing arc4random implementation. The current cprng_strong implementation wraps the new CTR_DRBG implementation. Both interfaces are rekeyed from the entropy pool automatically at intervals justifiable from best current cryptographic practice. In some quick tests, cprng_fast() is about the same speed as the old arc4randbytes(), and cprng_strong() is about 20% faster than rnd_extract_data(). Performance is expected to improve. The AES code in src/crypto/rijndael is no longer an optional kernel component, as it is required by cprng_strong, which is not an optional kernel component. The entropy pool output is subjected to the rngtest tests at startup time; if it fails, the system will reboot. There is approximately a 3/10000 chance of a false positive from these tests. Entropy pool _input_ from hardware random numbers is subjected to the rngtest tests at attach time, as well as the FIPS continuous-output test, to detect bad or stuck hardware RNGs; if any are detected, they are detached, but the system continues to run. A problem with rndctl(8) is fixed -- datastructures with pointers in arrays are no longer passed to userspace (this was not a security problem, but rather a major issue for compat32). A new kernel will require a new rndctl. The sysctl kern.arandom() and kern.urandom() nodes are hooked up to the new generators, but the /dev/*random pseudodevices are not, yet. Manual pages for the new kernel interfaces are forthcoming.
1.77	27-Aug-2011	hannken	branches: 1.77.2; Finish and enable whiteout support for tmpfs: - Enable VOP tmpfs_whiteout(). - Support ISWHITEOUT in tmpfs_alloc_file(). - Support DOWHITEOUT in tmpfs_remove() and tmpfs_rmdir(). - Make rmdir on a directory containing whiteouts working. Should fix PR #35112 (tmpfs doesn't play well with unionfs).
1.76	30-Jun-2011	enami	Backout previous. May be I need more coffee.
1.75	30-Jun-2011	enami	- Use << PAGE_SHIFT rather than calling round_page again. - No need to call uao_dropswap_range() here since uao_dropswap() is already called for each pages by uvm_vnp_setsize().
1.74	16-Jun-2011	hannken	Rename uvm_vnp_zerorange(struct vnode , off_t, size_t) to ubc_zerorange(struct uvm_object , off_t, size_t, int) changing the first argument to an uvm_object and adding a flags argument. Modify tmpfs_reg_resize() to zero the backing store (aobj) instead of the vnode. Ubc_purge() no longer panics when unmounting tmpfs. Keep uvm_vnp_zerorange() until the next kernel version bump.
1.73	12-Jun-2011	rmind	Welcome to 5.99.53! Merge rmind-uvmplock branch: - Reorganize locking in UVM and provide extra serialisation for pmap(9). New lock order: [vmpage-owner-lock] -> pmap-lock. - Simplify locking in some pmap(9) modules by removing P->V locking. - Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs). - Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner. Add TLBSTATS option for x86 to collect statistics about TLB shootdowns. - Unify /dev/mem et al in MI code and provide required locking (removes kernel-lock on some ports). Also, avoid cache-aliasing issues. Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches formed the core changes of this branch.
1.72	29-May-2011	rmind	branches: 1.72.2; Fix non-DEBUG build.
1.71	29-May-2011	rmind	- Rework and document inode reference counting. Also document inode life cycle (destruction part). Perform link counting in tmpfs_dir_attach() and tmpfs_dir_detach(), instead of alloc/free and arbitrary places. Fixes PR/44285, PR/44288, PR/44657 and likely PR/42484. - Fix the race between the lookup and inode destruction. Fixes PR/43167 and its duplicates PR/40088, PR/40757. - Improve tmpfs_rename() locking a little, fix kqueue event notifications and also fix PR/43617. Add simplistic tmpfs_parentcheck_p(); to be expanded and used for further rename() locking fixes. - Cache directory entry "hint" in the tmpfs node, add tmpfs_dir_cached(), and thus avoid unnecessary lookup in tmpfs_remove() and tmpfs_rmdir(). - Set correct _PC_FILESIZEBITS value in tmpfs_pathconf(). Fixes PR/43576. - Few minor fixes.
1.70	25-May-2011	rmind	tmpfs_update: comment out assert for now.
1.69	25-May-2011	rmind	tmpfs_dir_lookup: use 'name' variable in memcmp() as intended; fix warning.
1.68	24-May-2011	rmind	- tmpfs_lookup: cache (cnp->cn_flags & ISLASTCN) in const bool; de-indent. - Group tmpfs_{alloc,free}_dirent() with other dirent routines. No functional changes.
1.67	24-May-2011	rmind	- Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.66	24-May-2011	rmind	tmpfs_free_node: comment out assert, which can fire e.g. on shutdown.
1.65	24-May-2011	rmind	- tmpfs_alloc_node/tmpfs_free_node: move inode limiting into tmpfs_node_get() and tmpfs_node_put(), update outdated/wrong comments and move/add asserts. - tmpfs_mount: check for the version of arguments a bit earlier.
1.64	22-May-2011	rmind	tmpfs_alloc_vp: - Do not check for vn_lock(9) error, if LK_RETRY. - Fix/improve comments.
1.63	01-Apr-2011	hannken	Make zero length symlinks work on tmpfs. Fixes PR #43843 (tmpfs dies with kassert panic for 0 length symlink target)
1.62	13-Jan-2011	pooka	branches: 1.62.2; Add some support for unionfs (not built by default). It's still missing at least opaque directory support, but until someone figures out how that should work on ffs (see PR kern/kern/44383), there's no point in trying to figure out how it should work here.
1.61	30-Nov-2010	dholland	Abolish the SAVENAME and HASBUF flags. There is now always a buffer, so the path in a struct componentname is now always valid during VOP calls.
1.60	30-Nov-2010	dholland	Abolish struct componentname's cn_pnbuf. Use the path buffer in the pathbuf object passed to namei as work space instead. (For now a pnbuf pointer appears in struct nameidata, to support certain unclean things that haven't been fixed yet, but it will be going away in the future.) This removes the need for the SAVENAME and HASBUF namei flags.
1.59	21-Jul-2010	hannken	Make holding v_interlock mandatory for callers of vget(). Announced some time ago on tech-kern.
1.58	02-Jul-2010	rmind	tmpfs_lookup: add comment, de-ident main path. No functional change. tmpfs_dir_attach: add assert.
1.57	22-Jun-2010	rmind	Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.56	11-Nov-2009	rmind	branches: 1.56.2; 1.56.4; Simplify tmpfs_itimes() and use vfs_timestamp(). Also, replace unnecessary kmem_zalloc()s with kmem_alloc()s.
1.55	03-Sep-2009	pooka	"kauth_action_t = KAUTH_VNODE_WRITE_FLAGS;" must be C**. However, we still use plain ISO C, so additionally supply the variable name. Compile-tested only, but at least that's some testing.
1.54	03-Sep-2009	elad	Implement the vnode scope and adapt tmpfs to use it. Mailing list reference: http://mail-index.netbsd.org/tech-kern/2009/07/04/msg005404.html
1.53	07-May-2009	elad	Extract the open-coded authorization logic for chtimes() from various file-systems and put it in a single function, genfs_can_chtimes(). This also makes UDF follow the same policy as all other file-systems. Mailing list reference: http://mail-index.netbsd.org/tech-kern/2009/04/27/msg004951.html
1.52	22-Apr-2009	elad	Per discussion on tech-kern@: - Replace use of label/goto with returns - Rename, change prototype of, and move functions from vfs_subr.c to genfs_vnops.c
1.51	20-Apr-2009	elad	Refactor some duplicated file-system code. Proposed and received no objections on tech-kern@: http://mail-index.netbsd.org/tech-kern/2009/04/18/msg004843.html
1.50	11-Apr-2009	markd	For chown make auth checks consistent with UFS. Fixes PR kern/40933.
1.49	10-Apr-2009	yamt	- tmpfs_dir_lookup: simplify. - add some assertions.
1.48	19-Jun-2008	christos	branches: 1.48.4; 1.48.6; 1.48.10; - setting the birthdate is valid in setattr. - don't call nanotime if not needed. - don't call tempfs_update() if tempfs_chtimes succeeded, because it just did.
1.47	28-Apr-2008	martin	branches: 1.47.2; 1.47.4; Remove clause 3 and 4 from TNF licenses
1.46	06-Feb-2008	jmmv	branches: 1.46.6; 1.46.8; 1.46.10; u_int is not a C99 standard type, so spell it out completely as unsigned int.
1.45	06-Feb-2008	jmmv	Drop trailing whitespace.
1.44	24-Jan-2008	ad	specfs changes for PR kern/37717 (raidclose() is no longer called on shutdown). There are still problems with device access and a PR will be filed. - Kill checkalias(). Allow multiple vnodes to reference a single device. - Don't play dangerous tricks with block vnodes to ensure that only one vnode can describe a block device. Instead, prohibit concurrent opens of block devices. As a bonus remove the unreliable code that prevents multiple file system mounts on the same device. It's no longer needed. - Track opens by vnode and by device. Issue cdev_close() when the last open goes away, instead of abusing vnode::v_usecount to tell if the device is open.
1.43	02-Jan-2008	ad	Merge vmlocking2 to head.
1.42	08-Dec-2007	pooka	branches: 1.42.4; Remove cn_lwp from struct componentname. curlwp should be used from on. The NDINIT() macro no longer takes the lwp parameter and associates the credentials of the calling thread with the namei structure.
1.41	26-Nov-2007	pooka	branches: 1.41.2; Remove the "struct lwp *" argument from all VFS and VOP interfaces. The general trend is to remove it from all kernel interfaces and this is a start. In case the calling lwp is desired, curlwp should be used. quick consensus on tech-kern
1.40	10-Nov-2007	ad	Back out the tmpfs changes; there appears to be a bug lurking.
1.39	06-Nov-2007	ad	Merge from vmlocking.
1.38	10-Oct-2007	ad	branches: 1.38.4; Merge from vmlocking: - Split vnode::v_flag into three fields, depending on field locking. - simple_lock -> kmutex in a few places. - Fix some simple locking problems.
1.37	24-Sep-2007	rumble	Avoid stack allocation of large dirent structures in foo_readdir().
1.36	06-Aug-2007	pooka	branches: 1.36.2; 1.36.4; 1.36.6; When resizing a node, first drop extra pages and zero tail, and only then set the new size. Otherwise zerolen will always be, well, 0.
1.35	09-Jul-2007	ad	branches: 1.35.2; 1.35.6; Merge some of the less invasive changes from the vmlocking branch: - kthread, callout, devsw API changes - select()/poll() improvements - miscellaneous MT safety improvements
1.34	22-Feb-2007	thorpej	branches: 1.34.4; 1.34.6; TRUE -> true, FALSE -> false
1.33	21-Feb-2007	thorpej	Replace the Mach-derived boolean_t type with the C99 bool type. A future commit will replace use of TRUE and FALSE with true and false.
1.32	04-Jan-2007	elad	branches: 1.32.2; Consistent usage of KAUTH_GENERIC_ISSUSER.
1.31	02-Jan-2007	elad	Add KAUTH_SYSTEM_CHSYSFLAGS so we can get rid of the last three securelevel references (ufs, ext2fs, tmpfs). Intentionally undocumented.
1.30	16-Nov-2006	christos	__unused removal on arguments; approved by core.
1.29	09-Nov-2006	jmmv	Audit kqueue notifications. The reference behavior is taken from MFS and is represented in the regression tests.
1.28	05-Nov-2006	jmmv	Randomly initialize the node's generation to make file handles less predictable. This solves a problem that may appear when serving a tmpfs over NFS: if the server reboots, newly allocated files should have different file handles; otherwise the remote clients could access files they were not supposed to touch.
1.27	05-Nov-2006	jmmv	Truncate directory cookies to 31 bits to avoid problems exposed in Linux binaries which cast the returned values to 64-bits and fail due to sign expansion. More details are provided in the big comment in tmpfs.h that describes how the new tmpfs_dircookie works. This is a rather ugly hack that shall be fixed with a cleaner solution, but this resolves the problem in an effective way. Fixes kern PR/32034.
1.26	30-Oct-2006	jmmv	Grr... cvs diff scrolled too much and I didn't notice there were some unwanted changes in this file. Revert them; sorry.
1.25	30-Oct-2006	jmmv	When renaming a file, we have to modify the mtime of the directory holding it, not the mtime of the file itself. This fixes the problems exposed when unpacking software under a tmpfs and trying to build it because dependencies were not calculated properly (e.g. autoconf 2.60 as reported by tls@).
1.24	12-Oct-2006	christos	- sprinkle __unused on function decls. - fix a couple of unused bugs - no more -Wno-unused for i386
1.23	03-Sep-2006	christos	branches: 1.23.2; 1.23.4; comment out empty code
1.22	23-Jul-2006	ad	Use the LWP cached credentials where sane.
1.21	07-Jun-2006	kardel	branches: 1.21.4; merge FreeBSD timecounters from branch simonb-timecounters - struct timeval time is gone time.tv_sec -> time_second - struct timeval mono_time is gone mono_time.tv_sec -> time_uptime - access to time via {get,}{micro,nano,bin}time() get* versions are fast but less precise - support NTP nanokernel implementation (NTP API 4) - further reading: Timecounter Paper: http://phk.freebsd.dk/pubs/timecounter.pdf NTP Nanokernel: http://www.eecis.udel.edu/~mills/ntp/html/kern.html
1.20	15-May-2006	christos	branches: 1.20.2; kauth fallout
1.19	14-May-2006	elad	integrate kauth.
1.18	16-Feb-2006	jmmv	branches: 1.18.2; 1.18.4; 1.18.6; Do not use unnamed structures/unions without instances; they break the build under vax because of gcc 2.95. Found by he@.
1.17	11-Dec-2005	christos	branches: 1.17.2; 1.17.4; 1.17.6; merge ktrace-lwp.
1.16	28-Nov-2005	dan	take into account memory used for file cache pages, and wired pages, when calculating potential free space
1.15	28-Nov-2005	dan	simplify calculation of free swap space using uvm-exported statistics, with thanks to yamt@ for useful hints.
1.14	11-Nov-2005	yamt	branches: 1.14.2; - ignore truncation for VCHR/VBLK/VFIFO as it used to be before yamt-vop merge. PR/32049 from Atsushi Onoe. - reject setattr which attempts to change size of VLNK/VSOCK.
1.13	08-Nov-2005	yamt	branches: 1.13.2; tmpfs_reg_resize: drop swap slots on truncation. fix a problem pointed by jmmv@.
1.12	02-Nov-2005	yamt	merge yamt-vop branch. remove following VOPs. VOP_BLKATOFF VOP_VALLOC VOP_BALLOC VOP_REALLOCBLKS VOP_VFREE VOP_TRUNCATE VOP_UPDATE
1.11	30-Sep-2005	jmmv	branches: 1.11.2; Explicitly initialize the tn_lockf field. I expect problems in some situations otherwise...
1.10	28-Sep-2005	yamt	tmpfs_getattr: return up-to-date timestamps.
1.9	27-Sep-2005	jmmv	Some style fixes in comments.
1.8	23-Sep-2005	jmmv	Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.7	17-Sep-2005	yamt	fix buffer overrun for symbolic links. PR/31325.
1.6	16-Sep-2005	yamt	tmpfs_dir_getdotdotdent: correct fileid.
1.5	15-Sep-2005	yamt	change the way to handle directory "offsets" so that they won't be changed when removing entries in the directory. some applications like cvs rely on this.
1.4	13-Sep-2005	yamt	- don't waste/leak kva. - implement getpages/putpages. support mmap. - eliminate meaningless memcpy. - ubcify.
1.3	12-Sep-2005	christos	convert to use it nanotime, but don't call it unless it is necessary.
1.2	10-Sep-2005	jmmv	wiz@ remembers that the preferred way to spell file-system in NetBSD is file system.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.11.2.2	29-Oct-2005	yamt	as tmpfs_update never fails, make it return void. suggested by Chuck Silvers.
1.11.2.1	20-Oct-2005	yamt	adapt tmpfs.
1.13.2.4	11-Dec-2005	christos	Sync with head.
1.13.2.3	12-Nov-2005	skrll	Adapt to branch
1.13.2.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.13.2.1	08-Nov-2005	skrll	file tmpfs_subr.c was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.14.2.1	29-Nov-2005	yamt	sync with head.
1.17.6.4	01-Jun-2006	kardel	Sync with head.
1.17.6.3	22-Apr-2006	simonb	Sync with head.
1.17.6.2	05-Feb-2006	simonb	In the *itimes functions, just call getnanotime() at the start of the function and use the result if needed, rather than the previous conditional calls/assignments method. The code is clearer this way, and benchmarks at about the same speed.
1.17.6.1	04-Feb-2006	simonb	Adapt for timecounters: mostly use get*time() and use "time_second" instead of "time.tv_sec".
1.17.4.1	09-Sep-2006	rpaulo	sync with head
1.17.2.1	18-Feb-2006	yamt	sync with head.
1.18.6.1	24-May-2006	tron	Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
1.18.4.3	18-Apr-2006	elad	adapt to kauth, pointed out by yamt@, thanks!
1.18.4.2	10-Mar-2006	elad	generic_authorize() -> kauth_authorize_generic().
1.18.4.1	08-Mar-2006	elad	Adapt to kernel authorization KPI.
1.18.2.4	03-Sep-2006	yamt	sync with head.
1.18.2.3	11-Aug-2006	yamt	sync with head
1.18.2.2	26-Jun-2006	yamt	sync with head.
1.18.2.1	24-May-2006	yamt	sync with head.
1.20.2.1	19-Jun-2006	chap	Sync with head.
1.21.4.10	11-Feb-2008	yamt	sync with head.
1.21.4.9	04-Feb-2008	yamt	sync with head.
1.21.4.8	21-Jan-2008	yamt	sync with head
1.21.4.7	07-Dec-2007	yamt	sync with head
1.21.4.6	27-Oct-2007	yamt	sync with head.
1.21.4.5	03-Sep-2007	yamt	sync with head.
1.21.4.4	26-Feb-2007	yamt	sync with head.
1.21.4.3	30-Dec-2006	yamt	sync with head.
1.21.4.2	21-Jun-2006	yamt	sync with head.
1.21.4.1	07-Jun-2006	yamt	file tmpfs_subr.c was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.23.4.2	10-Dec-2006	yamt	sync with head.
1.23.4.1	22-Oct-2006	yamt	sync with head
1.23.2.2	12-Jan-2007	ad	Sync with head.
1.23.2.1	18-Nov-2006	ad	Sync with head.
1.32.2.1	27-Feb-2007	yamt	- sync with head. - move sched_changepri back to kern_synch.c as it doesn't know PPQ anymore.
1.34.6.1	11-Jul-2007	mjf	Sync with head.
1.34.4.11	23-Oct-2007	ad	Sync with head.
1.34.4.10	09-Oct-2007	ad	Sync with head.
1.34.4.9	09-Oct-2007	ad	Sync with head.
1.34.4.8	08-Oct-2007	ad	- Don't leave nodes dangling in order to keep track of the inode generation number. Free them back to the pool as soon as the referenced file becomes unused. Using arc4random() for the generation and ino_t based off the node's in-core address is just about as as good as a disk-based file system is going to give. - Add assertion to catch empty directories with linkcount > 1 being freed. This fires frequently but I haven't tracked the bug down yet.. - Use kmem_alloc.
1.34.4.7	18-Sep-2007	ad	tmpfs_alloc_vp: deal with vget() failure. Another thread may be reclaiming the vnode.
1.34.4.6	16-Sep-2007	ad	Fix another minor concurrency problem.
1.34.4.5	22-Aug-2007	ad	Fix some more concurrency problems.
1.34.4.4	21-Aug-2007	ad	- Add locking around tmpfs shared data structures and mark it MP safe. It's enough to last for about 45m of fsx+postmark, but it doesn't survive SGI fsstress yet. - Close a race where multiple vnodes could maybe have been allocated for a tmpnode with linkcount > 1.
1.34.4.3	20-Aug-2007	ad	Sync with HEAD.
1.34.4.2	17-Jun-2007	ad	- Increase the number of thread priorities from 128 to 256. How the space is set up is to be revisited. - Implement soft interrupts as kernel threads. A generic implementation is provided, with hooks for fast-path MD code that can run the interrupt threads over the top of other threads executing in the kernel. - Split vnode::v_flag into three fields, depending on how the flag is locked (by the interlock, by the vnode lock, by the file system). - Miscellaneous locking fixes and improvements.
1.34.4.1	05-Apr-2007	ad	Compile fixes.
1.35.6.7	09-Dec-2007	jmcneill	Sync with HEAD.
1.35.6.6	27-Nov-2007	joerg	Sync with HEAD. amd64 Xen support needs testing.
1.35.6.5	11-Nov-2007	joerg	Sync with HEAD.
1.35.6.4	06-Nov-2007	joerg	Sync with HEAD.
1.35.6.3	26-Oct-2007	joerg	Sync with HEAD. Follow the merge of pmap.c on i386 and amd64 and move pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup code to restore CR4 before jumping back into kernel space as the large page option might cover that.
1.35.6.2	02-Oct-2007	joerg	Sync with HEAD.
1.35.6.1	09-Aug-2007	jmcneill	Sync with HEAD.
1.35.2.1	15-Aug-2007	skrll	Sync with HEAD.
1.36.6.2	06-Aug-2007	pooka	When resizing a node, first drop extra pages and zero tail, and only then set the new size. Otherwise zerolen will always be, well, 0.
1.36.6.1	06-Aug-2007	pooka	file tmpfs_subr.c was added on branch matt-mips64 on 2007-08-06 16:08:56 +0000
1.36.4.2	14-Oct-2007	yamt	sync with head.
1.36.4.1	06-Oct-2007	yamt	sync with head.
1.36.2.4	23-Mar-2008	matt	sync with HEAD
1.36.2.3	09-Jan-2008	matt	sync with HEAD
1.36.2.2	08-Nov-2007	matt	sync with -HEAD
1.36.2.1	06-Nov-2007	matt	sync with HEAD
1.38.4.4	18-Feb-2008	mjf	Sync with HEAD.
1.38.4.3	27-Dec-2007	mjf	Sync with HEAD.
1.38.4.2	08-Dec-2007	mjf	Sync with HEAD.
1.38.4.1	19-Nov-2007	mjf	Sync with HEAD.
1.41.2.8	26-Dec-2007	ad	Sync with head.
1.41.2.7	15-Dec-2007	ad	tmpfs_reg_resize: drop swapslots after resizing to work around a panic. It may not be necessary to drop the swapslots at this point.
1.41.2.6	15-Dec-2007	ad	Fix accounting problem that allowed a tmpfs to be filled beyond its limit when running multithreaded.
1.41.2.5	13-Dec-2007	yamt	don't leak linkcount on errors.
1.41.2.4	12-Dec-2007	ad	Minor corrections to previous.
1.41.2.3	12-Dec-2007	ad	- Don't use LK_RETRY in tmpfs_alloc_vp(). - Reduce cosmetic diffs to head.
1.41.2.2	08-Dec-2007	ad	Reduce coverage of the per-mount lock by using atomic ops.
1.41.2.1	04-Dec-2007	ad	Pull the vmlocking changes into a new branch.
1.42.4.1	02-Jan-2008	bouyer	Sync with HEAD
1.46.10.6	11-Aug-2010	yamt	sync with head.
1.46.10.5	11-Mar-2010	yamt	sync with head
1.46.10.4	16-Sep-2009	yamt	sync with head
1.46.10.3	16-May-2009	yamt	sync with head
1.46.10.2	04-May-2009	yamt	sync with head.
1.46.10.1	16-May-2008	yamt	sync with head.
1.46.8.1	18-May-2008	yamt	sync with head.
1.46.6.2	29-Jun-2008	mjf	Sync with HEAD.
1.46.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.47.4.1	27-Jun-2008	simonb	Sync with head.
1.47.2.1	23-Jun-2008	wrstuden	Sync w/ -current. 34 merge conflicts to follow.
1.48.10.1	13-May-2009	jym	Sync with HEAD. Commit is split, to avoid a "too many arguments" protocol error.
1.48.6.1	12-Apr-2009	snj	Pull up following revision(s) (requested by markd in ticket #689): sys/fs/tmpfs/tmpfs_subr.c: revision 1.50 For chown make auth checks consistent with UFS. Fixes PR kern/40933.
1.48.4.1	28-Apr-2009	skrll	Sync with HEAD.
1.56.4.9	31-May-2011	rmind	sync with head
1.56.4.8	31-May-2011	rmind	tmpfs_alloc_vp: perform lock sharing only for VREG.
1.56.4.7	30-May-2011	rmind	- Amend getnewvnode(9) to take the lock for sharing, not a vnode. - Update tmpfs to perform vnode and UVM object lock sharing correctly.
1.56.4.6	22-May-2011	rmind	Fix vnode interlock sharing.
1.56.4.5	19-May-2011	rmind	Implement sharing of vnode_t::v_interlock amongst vnodes: - Lock is shared amongst UVM objects using uvm_obj_setlock() or getnewvnode(). - Adjust vnode cache to handle unsharing, add VI_LOCKSHARE flag for that. - Use sharing in tmpfs and layerfs for underlying object. - Simplify locking in ubc_fault(). - Sprinkle some asserts. Discussed with ad@.
1.56.4.4	21-Apr-2011	rmind	sync with head
1.56.4.3	05-Mar-2011	rmind	sync with head
1.56.4.2	03-Jul-2010	rmind	sync with head
1.56.4.1	16-Mar-2010	rmind	Change struct uvm_object::vmobjlock to be dynamically allocated with mutex_obj_alloc(). It allows us to share the locks among UVM objects.
1.56.2.1	17-Aug-2010	uebayasi	Sync with HEAD.
1.62.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.72.2.1	23-Jun-2011	cherry	Catchup with rmind-uvmplock merge.
1.77.2.2	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.77.2.1	17-Apr-2012	yamt	sync with head
1.78.2.1	05-Apr-2012	mrg	sync to latest -current.
1.79.4.1	18-May-2014	rmind	sync with head
1.79.2.2	03-Dec-2017	jdolecek	update from HEAD
1.79.2.1	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.96.4.2	08-Nov-2015	riz	Pull up following revision(s) (requested by leot in ticket #1023): sys/fs/tmpfs/tmpfs_subr.c: revision 1.101 Make sure that nde->td_node is NULL for asserts. Thanks and from Mindaugas Rasiukevicius. Fixes PR kern/50381.
1.96.4.1	22-Dec-2014	msaitoh	branches: 1.96.4.1.2; Pull up following revision(s) (requested by gson in ticket #344): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.121 sys/fs/tmpfs/tmpfs_subr.c: revision 1.97 Store symlinks without a NUL terminator so that lstat(2) returns the correct length. Fixes the tmpfs part of PR kern/48864.
1.96.4.1.2.1	08-Nov-2015	riz	Pull up following revision(s) (requested by leot in ticket #1023): sys/fs/tmpfs/tmpfs_subr.c: revision 1.101 Make sure that nde->td_node is NULL for asserts. Thanks and from Mindaugas Rasiukevicius. Fixes PR kern/50381.
1.97.2.4	05-Feb-2017	skrll	Sync with HEAD
1.97.2.3	27-Dec-2015	skrll	Sync with HEAD (as of 26th Dec)
1.97.2.2	22-Sep-2015	skrll	Sync with HEAD
1.97.2.1	06-Jun-2015	skrll	Sync with HEAD
1.101.2.1	07-Jan-2017	pgoyette	Sync with HEAD. (Note that most of these changes are simply $NetBSD$ tag issues.)
1.102.14.2	18-Jan-2019	pgoyette	Synch with HEAD
1.102.14.1	25-Jun-2018	pgoyette	Sync with HEAD
1.102.8.1	01-Aug-2023	martin	Pull up following revision(s) (requested by riastradh in ticket #1872): sys/fs/tmpfs/tmpfs_subr.c: revision 1.116 sys/fs/tmpfs/tmpfs_subr.c: revision 1.117 tmpfs: Refuse sizes that overflow round_page. tmpfs: Assert no arithmetic overflow in directory node tn_size. Need >2^57 directory entries before this is a problem. If we created a million per second, this would take over 4000 years.
1.103.2.3	13-Apr-2020	martin	Mostly merge changes from HEAD upto 20200411
1.103.2.2	08-Apr-2020	martin	Merge changes from current as of 20200406
1.103.2.1	10-Jun-2019	christos	Sync with HEAD
1.104.4.1	01-Aug-2023	martin	Pull up following revision(s) (requested by riastradh in ticket #1691): sys/fs/tmpfs/tmpfs_subr.c: revision 1.116 sys/fs/tmpfs/tmpfs_subr.c: revision 1.117 tmpfs: Refuse sizes that overflow round_page. tmpfs: Assert no arithmetic overflow in directory node tn_size. Need >2^57 directory entries before this is a problem. If we created a million per second, this would take over 4000 years.
1.105.2.3	29-Feb-2020	ad	Sync with head.
1.105.2.2	24-Jan-2020	ad	- Put all the namecache stuff back into vnode_impl_t. - Tidy vfs_cache.c up, finish the comments. - Finalise how ID information is entered to the cache. - Handle very small/old systems.
1.105.2.1	17-Jan-2020	ad	vfs_lookup: - Do the easy component name lookups directly in the namecache without taking vnode locks nor vnode references (between the start and the leaf / parent), which seems to largely solve the lock contention problem with namei(). It needs support from the file system, which has to tell the name cache about directory permissions (only ffs and tmpfs tried so far), and I'm not sure how or if it can work with layered file systems yet. Work in progress. vfs_cache: - Make the rbtree operations more efficient: inline the lookup, and key on a 64-bit hash value (32 bits plus 16 bits length) rather than names. - Take namecache stuff out of vnode_impl, and take the rwlocks, and put them all together an an nchnode struct which is mapped 1:1: with vnodes. Saves memory and nicer cache profile. - Add a routine to help vfs_lookup do its easy component name lookups. - Report some more stats. - Tidy up the file a bit.
1.108.2.1	25-Apr-2020	bouyer	Sync with bouyer-xenpvh-base2 (HEAD)
1.114.4.1	01-Aug-2023	martin	Pull up following revision(s) (requested by riastradh in ticket #289): sys/fs/tmpfs/tmpfs_subr.c: revision 1.116 sys/fs/tmpfs/tmpfs_subr.c: revision 1.117 tmpfs: Refuse sizes that overflow round_page. tmpfs: Assert no arithmetic overflow in directory node tn_size. Need >2^57 directory entries before this is a problem. If we created a million per second, this would take over 4000 years.
1.78	10-Nov-2022	hannken	Tmpfs_mount() uses tmpfs_unmount() for cleanup if set_statvfs_info() fails. This will not work as tmpfs_unmount() needs a suspended file system. Just call set_statvfs_info() before allocating the root vnode and add and use a common error exit label. Reported-by: syzbot+343f2bfea65a32ab4222@syzkaller.appspotmail.com
1.77	04-Apr-2020	ad	Merge the remaining changes from the ad-namecache branch, affecting namei() and getcwd(): - push vnode locking back as far as possible. - do most lookups directly in the namecache, avoiding vnode locks & refs. - don't block new refs to vnodes across VOP_INACTIVE(). - get shared locks for VOP_LOOKUP() if the file system supports it. - correct lock types for VOP_ACCESS() / VOP_GETATTR() in a few places. Possible future enhancements: - make the lookups lockless. - support dotdot lookups by being lockless and inferring absence of chroot. - maybe make it work for layered file systems. - avoid vnode references at the root & cwd.
1.76	17-Jan-2020	ad	VFS_VGET(), VFS_ROOT(), VFS_FHTOVP(): give them a "int lktype" argument, to allow us to get shared locks (or no lock) on the returned vnode. Matches FreeBSD.
1.75	04-Oct-2019	mrg	branches: 1.75.2; remove an always false check and its' "This can never happen?" comment.
1.74	01-Jan-2019	hannken	branches: 1.74.4; Add "void *extra" argument to vcache_new() so a file system may pass more information about the file to create. Welcome to 8.99.30
1.73	09-Aug-2018	christos	FIx performance regression from rmind@: Just from a very quick look, it seems like a regression introduced with the vcache changes: the MP-safe flag is set too late and not inherited by the root vnode.
1.72	01-Jun-2017	chs	branches: 1.72.2; 1.72.8; 1.72.10; remove checks for failure after memory allocation calls that cannot fail: kmem_alloc() with KM_SLEEP kmem_zalloc() with KM_SLEEP percpu_alloc() pserialize_create() psref_class_create() all of these paths include an assertion that the allocation has not failed, so callers should not assert that again.
1.71	01-Mar-2017	hannken	Change the protocol to update a mounted file system from read-write to read-only and vice versa: - Add an internal flag IMNT_WANTRDONLY. - Set either IMNT_WANTRDWR or IMNT_WANTRDONLY if going from or to read-only. - After successfull call to VFS_MOUNT() set or clear MNT_RDONLY. Adapt tmpfs and rumpfs to the new protocol. Other file systems will be updated when they get the IMNT_CAN_RWTORO property. Welcome to 7.99.64
1.70	17-Feb-2017	hannken	Add generic genfs_suspendctl() and use it for all file systems. Layered file systems need work.
1.69	27-Jan-2017	hannken	Run vflush() when going from read/write to read only.
1.68	26-Aug-2016	dholland	branches: 1.68.2; In the event that loading the root vnode fails, bail out of tmpfs_mount instead of crashing. Came up in PR 51436, where kmem issues caused internal allocations to wrongly fail. However, that could happen for real sometime (e.g. probably if you tried to mount a new tmpfs when the system was very low on memory, or possibly for other reasons entirely) and crashing isn't the ticket. (This is not a fix for PR 51436)
1.67	12-Mar-2016	joerg	branches: 1.67.2; Implement most of mount -ur functionality for tmpfs. Remaining issue is the question who is responsible for syncing pending writes, but the functionality is good enough for serving as read-only chroot base in bulk builds.
1.66	12-Mar-2016	joerg	Only recheck size/node limits on update mounts, if there actually have been specified.
1.65	06-Jul-2015	hannken	Change tmpfs to vcache. - Use tmpfs node address as key. - Remove tn_vlock, field tn_vnode now protected by vcache. - Add a hold count to tmpfs node to prevent nodes from disappearing while tmpfs_fhtovp() trys to vcache_get() them. Last holder destroys reclaimed nodes. - Remove the now unneeded parent unlock/lock for lookup of '..'.
1.64	06-Jul-2015	hannken	Use VFS_PROTOS() for tmpfs.
1.63	10-Jun-2014	martin	branches: 1.63.2; 1.63.4; Check for invalid mount arguments early and gracefully fail the mount. Spotted by pooka@
1.62	07-Jun-2014	martin	Remove the hardcoded 4 MB free kernel memory limit and replace it by uvmexp.freetarg, as discussed on tech-kern. Main purpose is to make tmpfs usable (as far as possible) on small memory machines. This is a bit experimental, but we need to give it some real world exposure to see how well it works.
1.61	30-Apr-2014	christos	fix typo
1.60	30-Apr-2014	christos	handle MNT_UPDATE
1.59	16-Apr-2014	maxv	An (un)privileged user can easily make the kernel dereference a NULL pointer. The kernel allows 'data' to be NULL; it's the fs's responsibility to ensure that it isn't NULL (if the fs actually needs data). ok christos@
1.58	23-Mar-2014	hannken	branches: 1.58.2; Change all vfsops to use C99 designated initializers. No functional changes intended.
1.57	06-Feb-2014	hannken	Remove an annoying printf. And to answer the question: VFS_VGET() gets used by NFS V3 server for readdirplus.
1.56	04-Jan-2014	hannken	Fix a race where thread1 runs VOP_REMOVE() and gets preempted in tmpfs_reclaim() before the call to tmpfs_free_node(). Thread2 runs VFS_FHTOVP() and gets a new vnode attached to the node thread1 is about to destroy. Change tmpfs_fhtovp() to check the generation number after tmpfs_vnode_get() succeeded.
1.55	23-Nov-2013	rmind	- Simplify tmpfs_update(), eliminate tmpfs_note_t::tn_status and deferred timestamp updates. Fix some incorrect updates and plug some missing ones. Should fix PR/48385. - tmpfs_rmdir: avoid O(n) scan when the directory is not empty and whiteout entries were never added.
1.54	10-Nov-2013	rmind	Handle whiteout case in tmpfs_dir_detach() and tmpfs_unmount().
1.53	08-Nov-2013	rmind	tmpfs: replace the broken tmpfs_dircookie() logic which uses the node address truncated to 31 bits (required for 32-bit readdir compatibility, e.g. linux32). Instead, assign 2^31 range using the following logic: - The first half of the 2^31 is assigned incrementally (the fast path). - When exceeded, use the second half of 2^31, but manage with vmem(9). It will require 2 billion files per-directory to trigger vmem(9) usage. Also, while here, add some fixes for tmpfs_unmount(). Should fix PR/47739, PR/47480, PR/46088 and PR/41068. Thanks to wiz@ for stress testing.
1.52	27-Sep-2011	christos	branches: 1.52.2; 1.52.8; 1.52.12; 1.52.14; 1.52.16; 1.52.22; define and use TMPFS_MAXNAMLEN instead of MAXNAMLEN
1.51	29-May-2011	rmind	- Rework and document inode reference counting. Also document inode life cycle (destruction part). Perform link counting in tmpfs_dir_attach() and tmpfs_dir_detach(), instead of alloc/free and arbitrary places. Fixes PR/44285, PR/44288, PR/44657 and likely PR/42484. - Fix the race between the lookup and inode destruction. Fixes PR/43167 and its duplicates PR/40088, PR/40757. - Improve tmpfs_rename() locking a little, fix kqueue event notifications and also fix PR/43617. Add simplistic tmpfs_parentcheck_p(); to be expanded and used for further rename() locking fixes. - Cache directory entry "hint" in the tmpfs node, add tmpfs_dir_cached(), and thus avoid unnecessary lookup in tmpfs_remove() and tmpfs_rmdir(). - Set correct _PC_FILESIZEBITS value in tmpfs_pathconf(). Fixes PR/43576. - Few minor fixes.
1.50	24-May-2011	rmind	- Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.49	24-May-2011	rmind	- tmpfs_alloc_node/tmpfs_free_node: move inode limiting into tmpfs_node_get() and tmpfs_node_put(), update outdated/wrong comments and move/add asserts. - tmpfs_mount: check for the version of arguments a bit earlier.
1.48	19-May-2011	rmind	- tmpfs: do not create dirent/node pools per-mount, there is no need to. - tmpfs_mount: fix a leak of mount structures in error path.
1.47	02-Apr-2011	hannken	Fix file handle operations for tmpfs by removing a now bogus test and fixing the return value of tmpfs_fhtovp() in the not-found case. When vmlocking2 was merged to head (Jan 2008 !!) the inode numbering was changed. Before inodes were numbered 2..tm_nodes_max-1 and after the merge the numbers are derived from the nodes memory address. Fixes PR #43605 (tmpfs file handles are broken)
1.46	26-Jun-2010	rmind	branches: 1.46.2; tmpfs_statvfs: hold accounting lock, since tmpfs_pages_avail() and tmpfs_bytes_max() may fluctuate while in calculations.
1.45	22-Jun-2010	rmind	Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.44	29-Jul-2008	pooka	branches: 1.44.4; 1.44.14; 1.44.16; 1.44.18; 1.44.22; Solve the fstat-wants-to-look-at-kernel-data-structures in a nicer way: don't export the fs internals to innocent userspace programs which just want to mount the file system.
1.43	28-Jul-2008	pooka	shuffle around some more defs for fstat noticed by Kurt Schreiner on current-users
1.42	28-Jul-2008	pooka	Install mount argument structure header just like every other file system.
1.41	10-May-2008	rumble	branches: 1.41.2; 1.41.4; Convert file systems to dynamically attach with the new module interface. Make VFS hooks dynamic while we're here and say farewell to VFS_ATTACH and VFS_HOOKS_ATTACH linksets. As a consequence, most of the file systems can now be loaded as new style modules. Quick sanity check by ad@.
1.40	29-Apr-2008	ad	branches: 1.40.2; PR kern/38057 ffs makes assuptions about devvp file system PR kern/33406 softdeps get stuck in endless loop Introduce VFS_FSYNC() and call it when syncing a block device, if it has a mounted file system.
1.39	28-Apr-2008	martin	Remove clause 3 and 4 from TNF licenses
1.38	06-Feb-2008	jmmv	branches: 1.38.6; 1.38.8; 1.38.10; Drop trailing whitespace.
1.37	05-Feb-2008	ad	Limit kva usage to 8TB and the number of inodes to 2G. Should fix PR kern/37951.
1.36	28-Jan-2008	dholland	Fix some race conditions in rename. Introduce a per-FS rename lock and new vfsops to manipulate it. Get this lock while renaming. Also add another relookup() in do_sys_rename, which is a hack to kludge around some of the worst deficiencies of ufs_rename. reviewed-by: pooka (and an earlier rev by ad) posted on tech-kern with no objections.
1.35	17-Jan-2008	pooka	Remove bogus KASSERT: we can't make any assumptions about a dirent's node in unmount since it might have been freed already. fixes PR kern/37667. per discussion with ad & simonb.
1.34	02-Jan-2008	ad	Merge vmlocking2 to head.
1.33	08-Dec-2007	pooka	branches: 1.33.4; Remove cn_lwp from struct componentname. curlwp should be used from on. The NDINIT() macro no longer takes the lwp parameter and associates the credentials of the calling thread with the namei structure.
1.32	26-Nov-2007	pooka	branches: 1.32.2; Remove the "struct lwp *" argument from all VFS and VOP interfaces. The general trend is to remove it from all kernel interfaces and this is a start. In case the calling lwp is desired, curlwp should be used. quick consensus on tech-kern
1.31	10-Nov-2007	ad	Back out the tmpfs changes; there appears to be a bug lurking.
1.30	06-Nov-2007	ad	Merge from vmlocking.
1.29	23-Oct-2007	dyoung	branches: 1.29.2; Fix typo: I'm pretty sure that in tmpfs_done(), both of the malloc(9) types are supposed to be detached, not attached.
1.28	24-Sep-2007	rumble	branches: 1.28.2; Avoid stack allocation of large dirent structures in foo_readdir().
1.27	03-Aug-2007	pooka	branches: 1.27.2; 1.27.4; 1.27.6; 1.27.8; Set mnt_fs_bshift and mnt_dev_bshift to reasonable dummy-values.
1.26	31-Jul-2007	pooka	* nuke the nameidata parameter from VFS_MOUNT(). Nobody on tech-kern knew what it was supposed to be used for and wrstuden gave a go-ahead * while rototilling, convert file systems which went easily to use VFS_PROTOS() instead of manually prototyping the methods
1.25	26-Jul-2007	pooka	Use eopnotsupp() instead of vfs_stdsuspendctl() and retire the latter.
1.24	17-Jul-2007	pooka	branches: 1.24.2; Make set_statvfs_info() take a parameter for the vfs name instead of always retrieving it from mp->mnt_op->vfs_name christos ok
1.23	12-Jul-2007	dsl	Change the VFS_MOUNT() interface so that the 'data' buffer passed to the fs code is a kernel buffer, pass though the length of the buffer as well. Since the length of the userspace buffer isn'it (yet) passed through the mount system call, add a field to the vfsops structure containing the default length. Split sys_mount() for calls from compat code. Ride one of the recent kernel version changes - old fs LKMs will load, but sys_mount() will reject any attempt to use them.
1.22	09-Jul-2007	ad	Merge some of the less invasive changes from the vmlocking branch: - kthread, callout, devsw API changes - select()/poll() improvements - miscellaneous MT safety improvements
1.21	30-Jun-2007	pooka	Using POOL_INIT here makes no sense, since file systems always have an init method. So get rid of it and #ifdef _LKM and just always init in the init method. Give malloc types the same treatment. Makes file systems nicer to work with in linksetless environments and fixes a few LKM discrepancies.
1.20	22-Feb-2007	thorpej	branches: 1.20.4; 1.20.6; TRUE -> true, FALSE -> false
1.19	21-Feb-2007	thorpej	Replace the Mach-derived boolean_t type with the C99 bool type. A future commit will replace use of TRUE and FALSE with true and false.
1.18	19-Jan-2007	hannken	branches: 1.18.2; New file system suspension API to replace vn_start_write and vn_finished_write. The suspension helpers are now put into file system specific operations. This means every file system not supporting these helpers cannot be suspended and therefore snapshots are no longer possible. Implemented for file systems of type ffs. The new API is enabled on a kernel option NEWVNGATE. This option is not enabled by default in any kernel config. Presented and discussed on tech-kern with much input from Bill Studenmund <wrstuden@netbsd.org> and YAMAMOTO Takashi <yamt@netbsd.org>. Welcome to 4.99.9 (new vfs op vfs_suspendctl).
1.17	16-Nov-2006	christos	__unused removal on arguments; approved by core.
1.16	09-Nov-2006	jmmv	Audit kqueue notifications. The reference behavior is taken from MFS and is represented in the regression tests.
1.15	12-Oct-2006	christos	- sprinkle __unused on function decls. - fix a couple of unused bugs - no more -Wno-unused for i386
1.14	03-Sep-2006	christos	branches: 1.14.2; 1.14.4; add missing initializers
1.13	13-Jul-2006	martin	Fix alignement problems for fhandle_t, exposed by gcc4.1. While touching all vptofh/fhtovp functions, get rid of VFS_MAXFIDSIZ, version the getfh(2) syscall and explicitly pass the size available in the filehandle from userland. Discussed on tech-kern, with lots of help from yamt (thanks!).
1.12	14-May-2006	elad	branches: 1.12.4; 1.12.6; integrate kauth.
1.11	16-Feb-2006	jmmv	branches: 1.11.2; 1.11.4; 1.11.6; Do not use unnamed structures/unions without instances; they break the build under vax because of gcc 2.95. Found by he@.
1.10	11-Dec-2005	christos	branches: 1.10.2; 1.10.4; 1.10.6; merge ktrace-lwp.
1.9	26-Sep-2005	jmmv	branches: 1.9.6; Handle too big numbers given in the max size argument.
1.8	25-Sep-2005	jmmv	Only consider valid flags in the root mode's parameter given by the user. I doubt the unchecked value could bring us problems, but better to be safe than sorry.
1.7	25-Sep-2005	jmmv	Sanity check negative values in the maximum size and number of nodes arguments to avoid a crash while mounting a tmpfs file system. Add a regression test for this too. Noticed by chs@.
1.6	23-Sep-2005	jmmv	Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.5	23-Sep-2005	jmmv	Start inode numbers on 2 to mimic UFS tradition (and to avoid problems if some utility relies on this).
1.4	23-Sep-2005	jmmv	Apply the NFS exports list rototill patch: - Remove all NFS related stuff from file system specific code. - Drop the vfs_checkexp hook and generalize it in the new nfs_check_export function, thus removing redundancy from all file systems. - Move all NFS export-related stuff from kern/vfs_subr.c to the new file sys/nfs/nfs_export.c. The former was becoming large and its code is always compiled, regardless of the build options. Using the latter, the code is only compiled in when NFSSERVER is enabled. While doing this, also make some functions in nfs_subs.c conditional to NFSSERVER. - Add a new command in nfssvc(2), called NFSSVC_SETEXPORTSLIST, that takes a path and a set of export entries. At the moment it can only clear the exports list or append entries, one by one, but it is done in a way that allows setting the whole set of entries atomically in the future (see the comment in mountd_set_exports_list or in doc/TODO). - Change mountd(8) to use the nfssvc(2) system call instead of mount(2) so that it becomes file system agnostic. In fact, all this whole thing was done to remove a 'XXX' block from this utility! - Change the mount, newfs and fsck userland utilities to not deal with NFS exports initialization; done internally by the kernel when initializing the NFS support for each file system. - Implement an interface for VFS (called VFS hooks) so that several kernel subsystems can run arbitrary code upon receipt of specific VFS events. At the moment, this only provides support for unmount and is used to destroy NFS exports lists from the file systems being unmounted, though it has room for extension. Thanks go to yamt@, chs@, thorpej@, wrstuden@ and others for their comments and advice in the development of this patch.
1.3	13-Sep-2005	jmmv	Nodes cannot use the '0' identifier or they will be skipped by readdir. E.g., the root node's '.' and '..' directory entries did not appear in a directory list, because the root node always holds the first id.
1.2	10-Sep-2005	jmmv	wiz@ remembers that the preferred way to spell file-system in NetBSD is file system.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.9.6.3	12-Nov-2005	skrll	Adapt to branch
1.9.6.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.9.6.1	26-Sep-2005	skrll	file tmpfs_vfsops.c was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.10.6.2	01-Jun-2006	kardel	Sync with head.
1.10.6.1	22-Apr-2006	simonb	Sync with head.
1.10.4.1	09-Sep-2006	rpaulo	sync with head
1.10.2.1	18-Feb-2006	yamt	sync with head.
1.11.6.1	24-May-2006	tron	Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
1.11.4.1	08-Mar-2006	elad	Adapt to kernel authorization KPI.
1.11.2.3	03-Sep-2006	yamt	sync with head.
1.11.2.2	11-Aug-2006	yamt	sync with head
1.11.2.1	24-May-2006	yamt	sync with head.
1.12.6.10	11-Feb-2008	yamt	sync with head.
1.12.6.9	04-Feb-2008	yamt	sync with head.
1.12.6.8	21-Jan-2008	yamt	sync with head
1.12.6.7	07-Dec-2007	yamt	sync with head
1.12.6.6	27-Oct-2007	yamt	sync with head.
1.12.6.5	03-Sep-2007	yamt	sync with head.
1.12.6.4	26-Feb-2007	yamt	sync with head.
1.12.6.3	30-Dec-2006	yamt	sync with head.
1.12.6.2	21-Jun-2006	yamt	sync with head.
1.12.6.1	14-May-2006	yamt	file tmpfs_vfsops.c was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.12.4.1	13-Jul-2006	gdamore	Merge from HEAD.
1.14.4.2	10-Dec-2006	yamt	sync with head.
1.14.4.1	22-Oct-2006	yamt	sync with head
1.14.2.2	01-Feb-2007	ad	Sync with head.
1.14.2.1	18-Nov-2006	ad	Sync with head.
1.18.2.1	27-Feb-2007	yamt	- sync with head. - move sched_changepri back to kern_synch.c as it doesn't know PPQ anymore.
1.20.6.1	11-Jul-2007	mjf	Sync with head.
1.20.4.7	08-Oct-2007	ad	- Don't leave nodes dangling in order to keep track of the inode generation number. Free them back to the pool as soon as the referenced file becomes unused. Using arc4random() for the generation and ino_t based off the node's in-core address is just about as as good as a disk-based file system is going to give. - Add assertion to catch empty directories with linkcount > 1 being freed. This fires frequently but I haven't tracked the bug down yet.. - Use kmem_alloc.
1.20.4.6	22-Aug-2007	ad	Fix some more concurrency problems.
1.20.4.5	21-Aug-2007	ad	- Add locking around tmpfs shared data structures and mark it MP safe. It's enough to last for about 45m of fsx+postmark, but it doesn't survive SGI fsstress yet. - Close a race where multiple vnodes could maybe have been allocated for a tmpnode with linkcount > 1.
1.20.4.4	20-Aug-2007	ad	Sync with HEAD.
1.20.4.3	15-Jul-2007	ad	Sync with head.
1.20.4.2	15-Jul-2007	ad	Sync with head.
1.20.4.1	05-Apr-2007	ad	Compile fixes.
1.24.2.1	15-Aug-2007	skrll	Sync with HEAD.
1.27.8.2	03-Aug-2007	pooka	Set mnt_fs_bshift and mnt_dev_bshift to reasonable dummy-values.
1.27.8.1	03-Aug-2007	pooka	file tmpfs_vfsops.c was added on branch matt-mips64 on 2007-08-03 13:00:20 +0000
1.27.6.1	06-Oct-2007	yamt	sync with head.
1.27.4.4	23-Mar-2008	matt	sync with HEAD
1.27.4.3	09-Jan-2008	matt	sync with HEAD
1.27.4.2	08-Nov-2007	matt	sync with -HEAD
1.27.4.1	06-Nov-2007	matt	sync with HEAD
1.27.2.7	09-Dec-2007	jmcneill	Sync with HEAD.
1.27.2.6	27-Nov-2007	joerg	Sync with HEAD. amd64 Xen support needs testing.
1.27.2.5	11-Nov-2007	joerg	Sync with HEAD.
1.27.2.4	06-Nov-2007	joerg	Sync with HEAD.
1.27.2.3	26-Oct-2007	joerg	Sync with HEAD. Follow the merge of pmap.c on i386 and amd64 and move pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup code to restore CR4 before jumping back into kernel space as the large page option might cover that.
1.27.2.2	02-Oct-2007	joerg	Sync with HEAD.
1.27.2.1	03-Aug-2007	joerg	file tmpfs_vfsops.c was added on branch jmcneill-pm on 2007-10-02 18:28:55 +0000
1.28.2.1	13-Nov-2007	bouyer	Sync with HEAD
1.29.2.4	18-Feb-2008	mjf	Sync with HEAD.
1.29.2.3	27-Dec-2007	mjf	Sync with HEAD.
1.29.2.2	08-Dec-2007	mjf	Sync with HEAD.
1.29.2.1	19-Nov-2007	mjf	Sync with HEAD.
1.32.2.6	26-Dec-2007	ad	Sync with head.
1.32.2.5	13-Dec-2007	yamt	don't leak linkcount on errors.
1.32.2.4	12-Dec-2007	ad	Minor corrections to previous.
1.32.2.3	12-Dec-2007	ad	- Don't use LK_RETRY in tmpfs_alloc_vp(). - Reduce cosmetic diffs to head.
1.32.2.2	08-Dec-2007	ad	Reduce coverage of the per-mount lock by using atomic ops.
1.32.2.1	04-Dec-2007	ad	Pull the vmlocking changes into a new branch.
1.33.4.2	19-Jan-2008	bouyer	Sync with HEAD
1.33.4.1	02-Jan-2008	bouyer	Sync with HEAD
1.38.10.3	11-Aug-2010	yamt	sync with head.
1.38.10.2	04-May-2009	yamt	sync with head.
1.38.10.1	16-May-2008	yamt	sync with head.
1.38.8.1	18-May-2008	yamt	sync with head.
1.38.6.2	28-Sep-2008	mjf	Sync with HEAD.
1.38.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.40.2.2	18-Sep-2008	wrstuden	Sync with wrstuden-revivesa-base-2.
1.40.2.1	23-Jun-2008	wrstuden	Sync w/ -current. 34 merge conflicts to follow.
1.41.4.1	19-Oct-2008	haad	Sync with HEAD.
1.41.2.3	31-Jul-2008	simonb	Sync with head.
1.41.2.2	29-Jul-2008	simonb	Sync with head.
1.41.2.1	28-Jul-2008	simonb	Sync with head.
1.44.22.1	28-Apr-2014	sborrill	Pull up the following revisions(s) (requested by maxv in ticket #1901): sys/kern/vfs_syscalls.c: revision 1.478, 1.480 via patch sys/coda/coda_vfsops.c: revision 1.81 sys/fs/adosfs/advfsops.c: revision 1.70 sys/fs/cd9660/cd9660_vfsops.c: revision 1.84 sys/fs/efs/efs_vfsops.c: revision 1.25 sys/fs/filecorefs/filecore_vfsops.c: revision 1.76 sys/fs/hfs/hfs_vfsops.c: revision 1.31 sys/fs/msdosfs/msdosfs_vfsops.c: revision 1.107 sys/fs/ntfs/ntfs_vfsops.c: revision 1.94 sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.50 via patch sys/fs/puffs/puffs_vfsops.c: revision 1.110 via patch sys/fs/smbfs/smbfs_vfsops.c: revision 1.100 sys/fs/sysvbfs/sysvbfs_vfsops.c: revision 1.43 sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.59 via patch sys/fs/udf/udf_vfsops.c: revision 1.67 sys/fs/union/union_vfsops.c: revision 1.72 sys/fs/unionfs/unionfs_vfsops.c: revision 1.13 sys/kern/vfs_syscalls.c: revision 1.479 sys/miscfs/nullfs/null_vfsops.c: revision 1.88 via patch sys/miscfs/overlay/overlay_vfsops.c: revision 1.61 sys/miscfs/procfs/procfs_vfsops.c: revision 1.91 sys/miscfs/umapfs/umap_vfsops.c: revision 1.92 sys/nfs/nfs_vfsops.c: revision 1.227 sys/ufs/ext2fs/ext2fs_vfsops.c: revision 1.180 sys/ufs/ffs/ffs_vfsops.c: revision 1.297 sys/ufs/lfs/lfs_vfsops.c: revision 1.321 sys/ufs/mfs/mfs_vfsops.c: revision 1.107 Due to missing checks in the mount syscall, and a wrong assumption on the file systems side, the kernel could allocate an unbounded or zero-sized memory buffer, and could dereference a NULL pointer when particular arguments are given by a user.
1.44.18.1	28-Apr-2014	sborrill	Pull up the following revisions(s) (requested by maxv in ticket #1901): sys/kern/vfs_syscalls.c: revision 1.478, 1.480 via patch sys/coda/coda_vfsops.c: revision 1.81 sys/fs/adosfs/advfsops.c: revision 1.70 sys/fs/cd9660/cd9660_vfsops.c: revision 1.84 sys/fs/efs/efs_vfsops.c: revision 1.25 sys/fs/filecorefs/filecore_vfsops.c: revision 1.76 sys/fs/hfs/hfs_vfsops.c: revision 1.31 sys/fs/msdosfs/msdosfs_vfsops.c: revision 1.107 sys/fs/ntfs/ntfs_vfsops.c: revision 1.94 sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.50 via patch sys/fs/puffs/puffs_vfsops.c: revision 1.110 via patch sys/fs/smbfs/smbfs_vfsops.c: revision 1.100 sys/fs/sysvbfs/sysvbfs_vfsops.c: revision 1.43 sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.59 via patch sys/fs/udf/udf_vfsops.c: revision 1.67 sys/fs/union/union_vfsops.c: revision 1.72 sys/fs/unionfs/unionfs_vfsops.c: revision 1.13 sys/kern/vfs_syscalls.c: revision 1.479 sys/miscfs/nullfs/null_vfsops.c: revision 1.88 via patch sys/miscfs/overlay/overlay_vfsops.c: revision 1.61 sys/miscfs/procfs/procfs_vfsops.c: revision 1.91 sys/miscfs/umapfs/umap_vfsops.c: revision 1.92 sys/nfs/nfs_vfsops.c: revision 1.227 sys/ufs/ext2fs/ext2fs_vfsops.c: revision 1.180 sys/ufs/ffs/ffs_vfsops.c: revision 1.297 sys/ufs/lfs/lfs_vfsops.c: revision 1.321 sys/ufs/mfs/mfs_vfsops.c: revision 1.107 Due to missing checks in the mount syscall, and a wrong assumption on the file systems side, the kernel could allocate an unbounded or zero-sized memory buffer, and could dereference a NULL pointer when particular arguments are given by a user.
1.44.16.3	31-May-2011	rmind	sync with head
1.44.16.2	21-Apr-2011	rmind	sync with head
1.44.16.1	03-Jul-2010	rmind	sync with head
1.44.14.1	17-Aug-2010	uebayasi	Sync with HEAD.
1.44.4.1	25-Apr-2014	sborrill	Pull up the following revisions(s) (requested by maxv in ticket #1901): sys/kern/vfs_syscalls.c: revision 1.478, 1.480 via patch sys/coda/coda_vfsops.c: revision 1.81 sys/fs/adosfs/advfsops.c: revision 1.70 sys/fs/cd9660/cd9660_vfsops.c: revision 1.84 sys/fs/efs/efs_vfsops.c: revision 1.25 sys/fs/filecorefs/filecore_vfsops.c: revision 1.76 sys/fs/hfs/hfs_vfsops.c: revision 1.31 sys/fs/msdosfs/msdosfs_vfsops.c: revision 1.107 sys/fs/ntfs/ntfs_vfsops.c: revision 1.94 sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.50 via patch sys/fs/puffs/puffs_vfsops.c: revision 1.110 via patch sys/fs/smbfs/smbfs_vfsops.c: revision 1.100 sys/fs/sysvbfs/sysvbfs_vfsops.c: revision 1.43 sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.59 via patch sys/fs/udf/udf_vfsops.c: revision 1.67 sys/fs/union/union_vfsops.c: revision 1.72 sys/fs/unionfs/unionfs_vfsops.c: revision 1.13 sys/kern/vfs_syscalls.c: revision 1.479 sys/miscfs/nullfs/null_vfsops.c: revision 1.88 via patch sys/miscfs/overlay/overlay_vfsops.c: revision 1.61 sys/miscfs/procfs/procfs_vfsops.c: revision 1.91 sys/miscfs/umapfs/umap_vfsops.c: revision 1.92 sys/nfs/nfs_vfsops.c: revision 1.227 sys/ufs/ext2fs/ext2fs_vfsops.c: revision 1.180 sys/ufs/ffs/ffs_vfsops.c: revision 1.297 sys/ufs/lfs/lfs_vfsops.c: revision 1.321 sys/ufs/mfs/mfs_vfsops.c: revision 1.107 Due to missing checks in the mount syscall, and a wrong assumption on the file systems side, the kernel could allocate an unbounded or zero-sized memory buffer, and could dereference a NULL pointer when particular arguments are given by a user.
1.46.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.52.22.1	21-Apr-2014	bouyer	Pull up following revision(s) (requested by maxv in ticket #1050): sys/ufs/chfs/chfs_vfsops.c: revision 1.11 sys/fs/unionfs/unionfs_vfsops.c: revision 1.13 sys/fs/nilfs/nilfs_vfsops.c: revision 1.16 sys/ufs/mfs/mfs_vfsops.c: revision 1.107 sys/fs/sysvbfs/sysvbfs_vfsops.c: revision 1.43 sys/ufs/ffs/ffs_vfsops.c: revision 1.297 sys/kern/vfs_syscalls.c: revision 1.478 sys/kern/vfs_syscalls.c: revision 1.479 sys/fs/puffs/puffs_vfsops.c: revision 1.110 sys/fs/cd9660/cd9660_vfsops.c: revision 1.84 sys/nfs/nfs_vfsops.c: revision 1.227 sys/fs/v7fs/v7fs_vfsops.c: revision 1.10 sys/ufs/ext2fs/ext2fs_vfsops.c: revision 1.180 sys/miscfs/umapfs/umap_vfsops.c: revision 1.92 sys/fs/filecorefs/filecore_vfsops.c: revision 1.76 sys/miscfs/nullfs/null_vfsops.c: revision 1.88 sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.50 sys/coda/coda_vfsops.c: revision 1.81 sys/ufs/lfs/lfs_vfsops.c: revision 1.321 sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.59 sys/fs/hfs/hfs_vfsops.c: revision 1.31 sys/miscfs/overlay/overlay_vfsops.c: revision 1.61 sys/fs/union/union_vfsops.c: revision 1.72 sys/fs/ntfs/ntfs_vfsops.c: revision 1.94 sys/kern/vfs_syscalls.c: revision 1.480 sys/fs/efs/efs_vfsops.c: revision 1.25 sys/kern/vfs_syscalls.c: revision 1.482 sys/fs/msdosfs/msdosfs_vfsops.c: revision 1.107 external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c: revision 1.12 sys/miscfs/procfs/procfs_vfsops.c: revision 1.91 sys/fs/smbfs/smbfs_vfsops.c: revision 1.100 sys/fs/adosfs/advfsops.c: revision 1.70 sys/fs/udf/udf_vfsops.c: revision 1.67 Limit check for 'data_len'. Otherwise a (un)privileged user can easily panic the system by passing a huge size. ok christos@ An (un)privileged user can easily make the kernel dereference a NULL pointer. The kernel allows 'data' to be NULL; it's the fs's responsibility to ensure that it isn't NULL (if the fs actually needs data). ok christos@ Some fs's - like kernfs - set their vfs_min_mount_data to zero. Add a check to prevent an (un)privileged user from requesting a zero-sized allocation (and thus a panic). This thing is totally buggy: 'data_len' is modified by the fs, so calling kmem_free with it while its value has changed since the kmem_alloc is far from being a good idea. If the kernel figures out that something mismatches, it will panic (typically with kernfs).
1.52.16.1	18-May-2014	rmind	sync with head
1.52.14.1	21-Apr-2014	bouyer	Pull up following revision(s) (requested by maxv in ticket #1050): sys/ufs/chfs/chfs_vfsops.c: revision 1.11 sys/fs/unionfs/unionfs_vfsops.c: revision 1.13 sys/fs/nilfs/nilfs_vfsops.c: revision 1.16 sys/ufs/mfs/mfs_vfsops.c: revision 1.107 sys/fs/sysvbfs/sysvbfs_vfsops.c: revision 1.43 sys/ufs/ffs/ffs_vfsops.c: revision 1.297 sys/kern/vfs_syscalls.c: revision 1.478 sys/kern/vfs_syscalls.c: revision 1.479 sys/fs/puffs/puffs_vfsops.c: revision 1.110 sys/fs/cd9660/cd9660_vfsops.c: revision 1.84 sys/nfs/nfs_vfsops.c: revision 1.227 sys/fs/v7fs/v7fs_vfsops.c: revision 1.10 sys/ufs/ext2fs/ext2fs_vfsops.c: revision 1.180 sys/miscfs/umapfs/umap_vfsops.c: revision 1.92 sys/fs/filecorefs/filecore_vfsops.c: revision 1.76 sys/miscfs/nullfs/null_vfsops.c: revision 1.88 sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.50 sys/coda/coda_vfsops.c: revision 1.81 sys/ufs/lfs/lfs_vfsops.c: revision 1.321 sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.59 sys/fs/hfs/hfs_vfsops.c: revision 1.31 sys/miscfs/overlay/overlay_vfsops.c: revision 1.61 sys/fs/union/union_vfsops.c: revision 1.72 sys/fs/ntfs/ntfs_vfsops.c: revision 1.94 sys/kern/vfs_syscalls.c: revision 1.480 sys/fs/efs/efs_vfsops.c: revision 1.25 sys/kern/vfs_syscalls.c: revision 1.482 sys/fs/msdosfs/msdosfs_vfsops.c: revision 1.107 external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c: revision 1.12 sys/miscfs/procfs/procfs_vfsops.c: revision 1.91 sys/fs/smbfs/smbfs_vfsops.c: revision 1.100 sys/fs/adosfs/advfsops.c: revision 1.70 sys/fs/udf/udf_vfsops.c: revision 1.67 Limit check for 'data_len'. Otherwise a (un)privileged user can easily panic the system by passing a huge size. ok christos@ An (un)privileged user can easily make the kernel dereference a NULL pointer. The kernel allows 'data' to be NULL; it's the fs's responsibility to ensure that it isn't NULL (if the fs actually needs data). ok christos@ Some fs's - like kernfs - set their vfs_min_mount_data to zero. Add a check to prevent an (un)privileged user from requesting a zero-sized allocation (and thus a panic). This thing is totally buggy: 'data_len' is modified by the fs, so calling kmem_free with it while its value has changed since the kmem_alloc is far from being a good idea. If the kernel figures out that something mismatches, it will panic (typically with kernfs).
1.52.12.2	03-Dec-2017	jdolecek	update from HEAD
1.52.12.1	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.52.8.1	21-Apr-2014	bouyer	Pull up following revision(s) (requested by maxv in ticket #1050): sys/ufs/chfs/chfs_vfsops.c: revision 1.11 sys/fs/unionfs/unionfs_vfsops.c: revision 1.13 sys/fs/nilfs/nilfs_vfsops.c: revision 1.16 sys/ufs/mfs/mfs_vfsops.c: revision 1.107 sys/fs/sysvbfs/sysvbfs_vfsops.c: revision 1.43 sys/ufs/ffs/ffs_vfsops.c: revision 1.297 sys/kern/vfs_syscalls.c: revision 1.478 sys/kern/vfs_syscalls.c: revision 1.479 sys/fs/puffs/puffs_vfsops.c: revision 1.110 sys/fs/cd9660/cd9660_vfsops.c: revision 1.84 sys/nfs/nfs_vfsops.c: revision 1.227 sys/fs/v7fs/v7fs_vfsops.c: revision 1.10 sys/ufs/ext2fs/ext2fs_vfsops.c: revision 1.180 sys/miscfs/umapfs/umap_vfsops.c: revision 1.92 sys/fs/filecorefs/filecore_vfsops.c: revision 1.76 sys/miscfs/nullfs/null_vfsops.c: revision 1.88 sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.50 sys/coda/coda_vfsops.c: revision 1.81 sys/ufs/lfs/lfs_vfsops.c: revision 1.321 sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.59 sys/fs/hfs/hfs_vfsops.c: revision 1.31 sys/miscfs/overlay/overlay_vfsops.c: revision 1.61 sys/fs/union/union_vfsops.c: revision 1.72 sys/fs/ntfs/ntfs_vfsops.c: revision 1.94 sys/kern/vfs_syscalls.c: revision 1.480 sys/fs/efs/efs_vfsops.c: revision 1.25 sys/kern/vfs_syscalls.c: revision 1.482 sys/fs/msdosfs/msdosfs_vfsops.c: revision 1.107 external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c: revision 1.12 sys/miscfs/procfs/procfs_vfsops.c: revision 1.91 sys/fs/smbfs/smbfs_vfsops.c: revision 1.100 sys/fs/adosfs/advfsops.c: revision 1.70 sys/fs/udf/udf_vfsops.c: revision 1.67 Limit check for 'data_len'. Otherwise a (un)privileged user can easily panic the system by passing a huge size. ok christos@ An (un)privileged user can easily make the kernel dereference a NULL pointer. The kernel allows 'data' to be NULL; it's the fs's responsibility to ensure that it isn't NULL (if the fs actually needs data). ok christos@ Some fs's - like kernfs - set their vfs_min_mount_data to zero. Add a check to prevent an (un)privileged user from requesting a zero-sized allocation (and thus a panic). This thing is totally buggy: 'data_len' is modified by the fs, so calling kmem_free with it while its value has changed since the kmem_alloc is far from being a good idea. If the kernel figures out that something mismatches, it will panic (typically with kernfs).
1.52.2.1	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.58.2.1	10-Aug-2014	tls	Rebase.
1.63.4.5	28-Aug-2017	skrll	Sync with HEAD
1.63.4.4	05-Feb-2017	skrll	Sync with HEAD
1.63.4.3	05-Oct-2016	skrll	Sync with HEAD
1.63.4.2	19-Mar-2016	skrll	Sync with HEAD
1.63.4.1	22-Sep-2015	skrll	Sync with HEAD
1.63.2.1	09-May-2016	snj	Pull up following revision(s) (requested by joerg in ticket #1163): sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.66, 1.67 sys/fs/tmpfs/tmpfs_vnops.c: revision 1.124 Only recheck size/node limits on update mounts, if there actually have been specified. -- Implement most of mount -ur functionality for tmpfs. Remaining issue is the question who is responsible for syncing pending writes, but the functionality is good enough for serving as read-only chroot base in bulk builds.
1.67.2.1	20-Mar-2017	pgoyette	Sync with HEAD
1.68.2.1	21-Apr-2017	bouyer	Sync with HEAD
1.72.10.3	13-Apr-2020	martin	Mostly merge changes from HEAD upto 20200411
1.72.10.2	08-Apr-2020	martin	Merge changes from current as of 20200406
1.72.10.1	10-Jun-2019	christos	Sync with HEAD
1.72.8.2	18-Jan-2019	pgoyette	Synch with HEAD
1.72.8.1	06-Sep-2018	pgoyette	Sync with HEAD Resolve a couple of conflicts (result of the uimin/uimax changes)
1.72.2.1	09-Aug-2018	martin	Pull up following revision(s) (requested by christos in ticket #968): sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.73 Fix tmpfs performance regression from rmind@: Just from a very quick look, it seems like a regression introduced with the vcache changes: the MP-safe flag is set too late and not inherited by the root vnode.
1.74.4.1	03-Mar-2020	martin	Pull up following revision(s) (requested by rin in ticket #753): sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.75 remove an always false check and its' "This can never happen?" comment.
1.75.2.3	24-Jan-2020	ad	- Put all the namecache stuff back into vnode_impl_t. - Tidy vfs_cache.c up, finish the comments. - Finalise how ID information is entered to the cache. - Handle very small/old systems.
1.75.2.2	19-Jan-2020	ad	Set IMNT_SHRLOOKUP and use it for the in-cache case. Need to check what more can be done with tmpfs though, it can probably do the whole lookup.
1.75.2.1	17-Jan-2020	ad	Sync with head.
1.150	01-Jun-2022	hannken	tmpfs_read: respect MNT_NOATIME.
1.149	27-Mar-2022	christos	add a kauth vnode check for creating links
1.148	20-Oct-2021	thorpej	Overhaul of the EVFILT_VNODE kevent(2) filter: - Centralize vnode kevent handling in the VOP_() wrappers, rather than forcing each individual file system to deal with it (except VOP_RENAME(), because VOP_RENAME() is a mess and we currently have 2 different ways of handling it; at least it's reasonably well-centralized in the "new" way). - Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ, compatible with the same events in FreeBSD. - Track which kevent notifications clients are interested in receiving to avoid doing work for events no one cares about (avoiding, e.g. taking locks and traversing the klist to send a NOTE_WRITE when someone is merely watching for a file to be deleted, for example). In support of the above: - Add support in vnode_if.sh for specifying PRE- and POST-op handlers, to be invoked before and after vop_pre() and vop_post(), respectively. Basic idea from FreeBSD, but implemented differently. - Add support in vnode_if.sh for specifying CONTEXT fields in the vop__args structures. These context fields are used to convey information between the file system VOP function and the VOP wrapper, but do not occupy an argument slot in the VOP_*() call itself. These context fields are initialized and subsequently interpreted by PRE- and POST-op handlers. - Version VOP_REMOVE(), uses the a context field for the file system to report back the resulting link count of the target vnode. Return this in tmpfs, udf, nfs, chfs, ext2fs, lfs, and ufs. NetBSD 9.99.92.
1.147	18-Jul-2021	dholland	Abolish all the silly indirection macros for initializing vnode ops tables. These are things of the form #define foofs_op genfs_op, or #define foofs_op genfs_eopnotsupp, or similar. They serve no purpose besides obfuscation, and have gotten cutpasted all over everywhere.
1.146	29-Jun-2021	dholland	- Add a new vnode op: VOP_PARSEPATH. - Move namei_getcomponent to genfs_vnops.c and call it genfs_parsepath. - Add a parsepath entry to every vnode ops table. VOP_PARSEPATH takes a directory vnode to be searched and a complete following path and chooses how much of that path to consume. To begin with, all parsepath calls are genfs_parsepath, which locates the first '/' as always. Note that the call doesn't take the whole struct componentname, only the string. The other bits of struct componentname should not be needed and there's no reason to cause potential complications by exposing them.
1.145	13-Dec-2020	chs	branches: 1.145.4; Disable use of UBC_FAULTBUSY in tmpfs_write() for now, which brings back zeroing of all new tmpfs data pages. The existing code that enables this optimization skips the zeroing in numerous cases where it is needed, resulting in corrupted files and data leaks from the page's previous identity.
1.144	05-Sep-2020	riastradh	branches: 1.144.2; Round of uvm.h cleanup. The poorly named uvm.h is generally supposed to be for uvm-internal users only. - Narrow it to files that actually need it -- mostly files that need to query whether curlwp is the pagedaemon, which should maybe be exposed by an external header. - Use uvm_extern.h where feasible and uvm_*.h for things not exposed by it. We should split up uvm_extern.h but this will serve for now to reduce the uvm.h dependencies. - Use uvm_stat.h and #ifdef UVMHIST uvm.h for files that use UVMHIST(ubchist), since ubchist is declared in uvm.h but the reference evaporates if UVMHIST is not defined, so we reduce header file dependencies. - Make uvm_device.h and uvm_swap.h independently includable while here. ok chs@
1.143	27-Jun-2020	christos	Introduce genfs_pathconf() and use it for the default case in all filesystems.
1.142	24-May-2020	ad	tmpfs_write(): use UBC_FAULTBUSY when extending files, if possible, to avoid zeroing of newly allocated pages & fault processing.
1.141	19-May-2020	ad	PR kern/32166: pgo_get protocol is ambiguous Also problems with tmpfs+nfs noted by hannken@. Don't pass PGO_ALLPAGES to pgo_get, and ignore PGO_DONTCARE in the !PGO_LOCKED case. In uao_get() have uvm_pagealloc() take care of page zeroing and release busy pages on error.
1.140	17-May-2020	ad	Minor correction to previous.
1.139	17-May-2020	ad	PR kern/55268: tmpfs is slow tmpfs_getpages(): handle the PGO_LOCKED case and implement lazy update of atime/mtime.
1.138	16-May-2020	christos	Add ACL support for FFS. From FreeBSD.
1.137	15-May-2020	ad	PR kern/55268: tmpfs is slow Enter dotdot into the namecache.
1.136	23-Apr-2020	ad	PR kern/54759 (vm.ubc_direct deadlock when read()/write() into mapping of itself) - Add new flag UBC_ISMAPPED which tells ubc_uiomove() the object is mmap()ed somewhere. Use it to decide whether to do direct-mapped copy, rather than poking around directly in the vnode in ubc_uiomove(), which is ugly and doesn't work for tmpfs. It would be nicer to contain all this in UVM but the filesystem provides the needed locking here (VV_MAPPED) and to reinvent that would suck more. - Rename UBC_UNMAP_FLAG() to UBC_VNODE_FLAGS(). Pass in UBC_ISMAPPED where appropriate.
1.135	14-Mar-2020	ad	branches: 1.135.2; tmpfs_inactive(): do like other file systems and truncate the file if it has been deleted. Otherwise VFS will try to write cached data "back to disc", which in the case of a UAO means needless page deactivations and the resulting TLB shootdowns.
1.134	23-Feb-2020	ad	UVM locking changes, proposed on tech-kern: - Change the lock on uvm_object, vm_amap and vm_anon to be a RW lock. - Break v_interlock and vmobjlock apart. v_interlock remains a mutex. - Do partial PV list locking in the x86 pmap. Others to follow later.
1.133	26-May-2017	riastradh	branches: 1.133.10; 1.133.16; Make VOP_RECLAIM do the last unlock of the vnode. VOP_RECLAIM naturally has exclusive access to the vnode, so having it locked on entry is not strictly necessary -- but it means if there are any final operations that must be done on the vnode, such as ffs_update, requiring exclusive access to it, we can now kassert that the vnode is locked in those operations. We can't just have the caller release the last lock because some file systems don't use genfs_lock, and require the vnode to remain valid for VOP_UNLOCK to work, notably unionfs.
1.132	26-Apr-2017	riastradh	Change VOP_REMOVE and VOP_RMDIR to preserve lock/ref on dvp. No change to vp -- the plan is to replace the node by the componentname in the vop parameters, and let all directory vops do lookups internally. Proposed on tech-kern with no objections: https://mail-index.netbsd.org/tech-kern/2017/04/17/msg021825.html
1.131	11-Apr-2017	riastradh	Make VOP_INACTIVE preserve vnode lock on return. Discussed on tech-kern: https://mail-index.netbsd.org/tech-kern/2017/04/01/msg021751.html Ride 7.99.68, a bumpy bus of incremental vfs improvements!
1.130	30-Mar-2017	hannken	Protect tmpfs_getpages() against reclaiming vnodes.
1.129	11-Jan-2017	joerg	branches: 1.129.2; Remove RO check in tmpfs_putpages for now, the syncer doesn't like the error code.
1.128	20-Aug-2016	hannken	Remove now obsolete operation vcache_remove(). Welcome to 7.99.36
1.127	12-Mar-2016	martin	branches: 1.127.2; Backout previous - need coffee first
1.126	12-Mar-2016	martin	Mark a variable as __diagused.
1.125	12-Mar-2016	kardel	do no access uninitialized variables in KASSERTs - fixes build
1.124	12-Mar-2016	joerg	Implement most of mount -ur functionality for tmpfs. Remaining issue is the question who is responsible for syncing pending writes, but the functionality is good enough for serving as read-only chroot base in bulk builds.
1.123	06-Jul-2015	hannken	Change tmpfs to vcache. - Use tmpfs node address as key. - Remove tn_vlock, field tn_vnode now protected by vcache. - Add a hold count to tmpfs node to prevent nodes from disappearing while tmpfs_fhtovp() trys to vcache_get() them. Last holder destroys reclaimed nodes. - Remove the now unneeded parent unlock/lock for lookup of '..'.
1.122	20-Apr-2015	riastradh	Make VOP_LINK return directory still locked and referenced. Ride 7.99.10 bump.
1.121	08-Sep-2014	gson	branches: 1.121.2; Store symlinks without a NUL terminator so that lstat(2) returns the correct length. Fixes the tmpfs part of PR kern/48864.
1.120	25-Jul-2014	dholland	branches: 1.120.2; Add VOP_FALLOCATE and VOP_FDISCARD to every vnode ops table I can find. The filesystem ones all call genfs_eopnotsupp - right now I am only implementing the plumbing and we can implement fallocate and/or fdiscard for files later. The device ones call spec_fallocate (which is also genfs_eopnotsupp) and spec_fdiscard, which dispatches to the device-level op. The fifo ones all call vn_fifo_bypass, which also ends up being EOPNOTSUPP.
1.119	26-May-2014	rmind	tmpfs_mknod: it is not our responsibility to call vput() on the directory vnode, so remove it (and ensure *vpp is NULL while here).
1.118	27-Feb-2014	hannken	branches: 1.118.2; The current implementation of vn_lock() is racy. Modification of the vnode operations vector for active vnodes is unsafe because it is not known whether deadfs or the original file system will be called. - Pass down LK_RETRY to the lock operation (hint for deadfs only). - Change deadfs lock operation to return ENOENT if LK_RETRY is unset. - Change all other lock operations to check for dead vnode once the vnode is locked and unlock and return ENOENT in this case. With these changes in place vnode lock operations will never succeed after vclean() has marked the vnode as VI_XLOCK and before vclean() has changed the operations vector. Adresses PR kern/37706 (Forced unmount of file systems is unsafe) Discussed on tech-kern. Welcome to 6.99.33
1.117	17-Feb-2014	maxv	Adapt my previous patch differently. read(2) wants EISDIR when the object is a directory. Which also means that tmpfs_read() was returning a wrong error code when dealing with non-regular vnodes.
1.116	16-Feb-2014	maxv	Fix tmpfs_read()'s return value; it should return EINVAL. Now consistent with tmpfs_write(). ok christos@
1.115	07-Feb-2014	hannken	Change vnode operation lookup to return the resulting vnode *vpp unlocked. Change cache_lookup() to return an unlocked vnode. Discussed on tech-kern@ Welcome to 6.99.31
1.114	23-Jan-2014	hannken	Change vnode operations create, mknod, mkdir and symlink to return the resulting vnode *vpp unlocked. Discussed on tech-kern@ Welcome to 6.99.30
1.113	17-Jan-2014	hannken	Change vnode operations create, mknod, mkdir and symlink to keep the directory node dvp locked on return. Discussed on tech-kern@ Welcome to 6.99.29
1.112	10-Jan-2014	pedro	Prevent a diagnostic assertion in tmpfs_rmdir() from being triggered through an rmdir on ".." by moving it so it happens after the check for empty directories; OK rmind@.
1.111	03-Jan-2014	hannken	Fix a race where thread1 runs VOP_REMOVE() and gets preempted in tmpfs_reclaim() before the call to tmpfs_free_node(). Thread2 runs VFS_FHTOVP() and gets a new vnode attached to the node thread1 is about to destroy. Change tmpfs_alloc_node() to always assign non-zero generation number and tmpfs_inactive() to set the generation number of unlinked nodes to zero.
1.110	24-Dec-2013	hannken	It is not the task of tmpfs_open() to check for unlinked nodes. Fix tmpfs_lookup() to always return ENOENT when looking up from an unlinked directory.
1.109	24-Nov-2013	rmind	- tmpfs_construct_node: prevent from the new node construction if the directory was removed. Fixes the crash reported by Nicolas Joly. - tmpfs_reclaim: avoid race by checking tn_links with the vnode locked.
1.108	23-Nov-2013	rmind	Fix previous, add __diagused.
1.107	23-Nov-2013	rmind	- Simplify tmpfs_update(), eliminate tmpfs_note_t::tn_status and deferred timestamp updates. Fix some incorrect updates and plug some missing ones. Should fix PR/48385. - tmpfs_rmdir: avoid O(n) scan when the directory is not empty and whiteout entries were never added.
1.106	08-Nov-2013	rmind	tmpfs: replace the broken tmpfs_dircookie() logic which uses the node address truncated to 31 bits (required for 32-bit readdir compatibility, e.g. linux32). Instead, assign 2^31 range using the following logic: - The first half of the 2^31 is assigned incrementally (the fast path). - When exceeded, use the second half of 2^31, but manage with vmem(9). It will require 2 billion files per-directory to trigger vmem(9) usage. Also, while here, add some fixes for tmpfs_unmount(). Should fix PR/47739, PR/47480, PR/46088 and PR/41068. Thanks to wiz@ for stress testing.
1.105	01-Nov-2013	rmind	tmpfs: fix the zero-length symlink target case as NetBSD supports them.
1.104	31-Oct-2013	rmind	tmpfs_alloc_node: it is less error-prone to store the link path with the NIL terminator included. Adjust tmpfs_readlink() to exclude NIL. Also, remove the check for zero-length and add some asserts.
1.103	04-Oct-2013	rmind	- tmpfs_remove: check 'appendable' flag for the parent directory as well. Patch from Pedro Martelletto. - tmpfs_dir_detach: remove missleading check. - tmpfs_link: remove unused variable.
1.102	01-Oct-2013	rmind	tmpfs_remove: as per POSIX, "if the file's link count is not 0, the last file status change timestamp of the file shall be marked for update." From Pedro Martelletto.
1.101	18-Mar-2013	plunky	branches: 1.101.6; C99 section 6.7.2.3 (Tags) Note 3 states that: A type specifier of the form enum identifier without an enumerator list shall only appear after the type it specifies is complete. which means that we cannot pass an "enum vtype" argument to kauth_access_action() without fully specifying the type first. Unfortunately there is a complicated include file loop which makes that difficult, so convert this minimal function into a macro (and capitalize it). (ok elad@)
1.100	05-Nov-2012	dholland	Excise struct componentname from the namecache. This uglifies the interface, because several operations need to be passed the namei flags and cache_lookup also needs for the time being to be passed cnp->cn_nameiop. Nonetheless, it's a net benefit. The glop should be able to go away eventually but requires structural cleanup elsewhere first. This change requires a kernel bump.
1.99	05-Nov-2012	dholland	Disentangle the namecache from the internals of namei. - Move the namecache's hash computation to inside the namecache code, instead of being spread out all over the place. Remove cn_hash from struct componentname and delete all uses of it. - It is no longer necessary (if it ever was) for cache_lookup and cache_lookup_raw to clear MAKEENTRY from cnp->cn_flags for the cases that cache_enter already checks for. - Rearrange the interface of cache_lookup (and cache_lookup_raw) to make it somewhat simpler, to exclude certain nonexistent error conditions, and (most importantly) to make it not require write access to cnp->cn_flags. This change requires a kernel bump.
1.98	22-Jul-2012	rmind	branches: 1.98.2; Move some the test for MAKEENTRY into the cache_enter(9). Make some variables in vfs_cache.c static, __read_mostly, etc. No objection on tech-kern@.
1.97	09-May-2012	riastradh	Adapt tmpfs_rename to use genfs_rename.
1.96	13-Mar-2012	elad	Replace the remaining KAUTH_GENERIC_ISSUSER authorization calls with something meaningful. All relevant documentation has been updated or written. Most of these changes were brought up in the following messages: http://mail-index.netbsd.org/tech-kern/2012/01/18/msg012490.html http://mail-index.netbsd.org/tech-kern/2012/01/19/msg012502.html http://mail-index.netbsd.org/tech-kern/2012/02/17/msg012728.html Thanks to christos, manu, njoly, and jmmv for input. Huge thanks to pgoyette for spinning these changes through some build cycles and ATF.
1.95	27-Feb-2012	chs	in tmpfs_readdir(), skip the . and .. processing on removed directories, since the latter will crash in this case.
1.94	22-Jan-2012	rmind	branches: 1.94.2; tmpfs_access: simplify, no need to separate the logic.
1.93	18-Nov-2011	christos	branches: 1.93.4; Obey MNT_RELATIME, the only addition is that mkdir in ufs sets IN_ACCESS too.
1.92	27-Sep-2011	christos	branches: 1.92.2; return TMPFS_MAXNAMLEN instead of NAME_MAX
1.91	27-Sep-2011	christos	define and use TMPFS_MAXNAMLEN instead of MAXNAMLEN
1.90	27-Aug-2011	hannken	Finish and enable whiteout support for tmpfs: - Enable VOP tmpfs_whiteout(). - Support ISWHITEOUT in tmpfs_alloc_file(). - Support DOWHITEOUT in tmpfs_remove() and tmpfs_rmdir(). - Make rmdir on a directory containing whiteouts working. Should fix PR #35112 (tmpfs doesn't play well with unionfs).
1.89	18-Aug-2011	riastradh	Fix tmpfs_rename locking. Fixes PR kern/36681. tmpfs now survives dirconc, all our vfs/tmpfs tests and rename races in atf, and a bunch of hand-written tests that I'd commit if atf didn't find them highly indigestible. ok dholland
1.88	13-Jul-2011	riastradh	Fix renaming over mismatched non-directory types in tmpfs. Renaming a file of any non-directory type over another file of any other non-directory type is OK -- they need not match as long as neither is a directory, so loosen the kassert to reflect this. XXX Need to write test cases for this. ok dholland, rmind
1.87	12-Jun-2011	rmind	Welcome to 5.99.53! Merge rmind-uvmplock branch: - Reorganize locking in UVM and provide extra serialisation for pmap(9). New lock order: [vmpage-owner-lock] -> pmap-lock. - Simplify locking in some pmap(9) modules by removing P->V locking. - Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs). - Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner. Add TLBSTATS option for x86 to collect statistics about TLB shootdowns. - Unify /dev/mem et al in MI code and provide required locking (removes kernel-lock on some ports). Also, avoid cache-aliasing issues. Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches formed the core changes of this branch.
1.86	30-May-2011	rmind	branches: 1.86.2; - tmpfs_getattr: perform tmpfs_update() before fetching the timestamps. - tmpfs_rmdir: detach after tn_links decrement, so that correct event i.e. NOTE_DELETE would be trigerred.
1.85	29-May-2011	rmind	- Rework and document inode reference counting. Also document inode life cycle (destruction part). Perform link counting in tmpfs_dir_attach() and tmpfs_dir_detach(), instead of alloc/free and arbitrary places. Fixes PR/44285, PR/44288, PR/44657 and likely PR/42484. - Fix the race between the lookup and inode destruction. Fixes PR/43167 and its duplicates PR/40088, PR/40757. - Improve tmpfs_rename() locking a little, fix kqueue event notifications and also fix PR/43617. Add simplistic tmpfs_parentcheck_p(); to be expanded and used for further rename() locking fixes. - Cache directory entry "hint" in the tmpfs node, add tmpfs_dir_cached(), and thus avoid unnecessary lookup in tmpfs_remove() and tmpfs_rmdir(). - Set correct _PC_FILESIZEBITS value in tmpfs_pathconf(). Fixes PR/43576. - Few minor fixes.
1.84	24-May-2011	rmind	- tmpfs_lookup: cache (cnp->cn_flags & ISLASTCN) in const bool; de-indent. - Group tmpfs_{alloc,free}_dirent() with other dirent routines. No functional changes.
1.83	24-May-2011	rmind	- Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.82	19-May-2011	rmind	Add comments, clean up.
1.81	19-May-2011	rmind	Remove cache_purge(9) calls from reclamation routines in the file systems, as vclean(9) performs it for us since Lite2 merge.
1.80	10-May-2011	matt	yes, more C99 please (back out previous change).
1.79	08-May-2011	christos	no c99 please.
1.78	02-May-2011	rmind	Constify, update some comments, use memset() to clear pgs.
1.77	24-Apr-2011	rmind	sys_link: prevent hard links on directories (cross-mount operations are already prevented). File systems are no longer responsible to check this. Clean up and add asserts (note that dvp == vp cannot happen in vop_link). OK dholland@
1.76	13-Jan-2011	pooka	branches: 1.76.2; Add some support for unionfs (not built by default). It's still missing at least opaque directory support, but until someone figures out how that should work on ffs (see PR kern/kern/44383), there's no point in trying to figure out how it should work here.
1.75	30-Nov-2010	dholland	Abolish the SAVENAME and HASBUF flags. There is now always a buffer, so the path in a struct componentname is now always valid during VOP calls.
1.74	30-Nov-2010	dholland	Abolish struct componentname's cn_pnbuf. Use the path buffer in the pathbuf object passed to namei as work space instead. (For now a pnbuf pointer appears in struct nameidata, to support certain unclean things that haven't been fixed yet, but it will be going away in the future.) This removes the need for the SAVENAME and HASBUF namei flags.
1.73	14-Jul-2010	pooka	return same errno as ffs
1.72	02-Jul-2010	rmind	tmpfs_lookup: add comment, de-ident main path. No functional change. tmpfs_dir_attach: add assert.
1.71	24-Jun-2010	hannken	Clean up vnode lock operations pass 2: VOP_UNLOCK(vp, flags) -> VOP_UNLOCK(vp): Remove the unneeded flags argument. Welcome to 5.99.32. Discussed on tech-kern.
1.70	22-Jun-2010	rmind	Replace tmpfs_pool custom allocator code with a simpler layer for memory accounting. Use wired memory (which can be limited) for meta-data, and kmem(9) for string allocations. Close PR/31944. Fix PR/38361 while here. OK ad@.
1.69	23-Apr-2010	pooka	Enforce RLIMIT_FSIZE before VOP_WRITE. This adds support to file system drivers where it was missing from and fixes one buggy implementation. The arguably weird semantics of the check are maintained (v_size vs. va_bytes, overwrite).
1.68	29-Mar-2010	pooka	Stop exposing fifofs internals and leave only fifo_vnodeop_p visible.
1.67	27-Mar-2010	pooka	\n, police!
1.66	08-Jan-2010	pooka	branches: 1.66.2; 1.66.4; The VATTR_NULL/VREF/VHOLD/HOLDRELE() macros lost their will to live years ago when the kernel was modified to not alter ABI based on DIAGNOSTIC, and now just call the respective function interfaces (in lowercase). Plenty of mix'n match upper/lowercase has creeped into the tree since then. Nuke the macros and convert all callsites to lowercase. no functional change
1.65	22-Nov-2009	jmmv	Fix panic when trying to delete a directory entry (hi yamt!) by not attempting to release a pnbuf that does not exist. I.e. fixes "mkdir a ; unlink a/.". And actually, this was caught by the automated tests.
1.64	17-Oct-2009	njoly	Make tmpfs write fail when process file size limit is reached.
1.63	06-Oct-2009	rmind	tmpfs_rename: handle hard-links correctly. Fixes PR/41236.
1.62	03-Sep-2009	elad	Implement the vnode scope and adapt tmpfs to use it. Mailing list reference: http://mail-index.netbsd.org/tech-kern/2009/07/04/msg005404.html
1.61	03-Jul-2009	elad	Where possible, extract the file-system's access() routine to two internal functions: the first checking if the operation is possible (regardless of permissions), the second checking file-system permissions, ACLs, etc. Mailing list reference: http://mail-index.netbsd.org/tech-kern/2009/06/21/msg005311.html
1.60	23-Jun-2009	elad	Move the implementation of vaccess() to genfs_can_access(), in line with the other routines of the same spirit. Adjust file-system code to use it. Keep vaccess() for KPI compatibility and to keep element of least surprise. A "diagnostic" message warning that vaccess() is deprecated will be printed when it's used (obviously, only in DIAGNOSTIC kernels). No objections on tech-kern@: http://mail-index.netbsd.org/tech-kern/2009/06/21/msg005310.html
1.59	29-Apr-2009	pooka	replace outdated comment. no functional change
1.58	15-Apr-2009	yamt	plug some pnbuf leaks.
1.57	11-Apr-2009	perry	SAVENAME was not set for rename and delete as required Patch from christos, fixes pr 41183
1.56	05-Apr-2009	pooka	Invariants should be tested for with KASSERT instead of semi-pretending that them not holding is an acceptable error condition.
1.55	03-Apr-2009	pooka	Fix yet another recent crashy bug in tmpfs rename: since the source dirent is no longer cached in lookup and we do the lookup ourselves in rename, we are most definitely not allowed to assert that it matches the source vnode passed as an argument. In case the source node does not exist or has been replaced, punt with ENOENT. Also, nuke some misleading prehistoric comments which haven't been valid in over a year. Fixes PR kern/41128 by Nicolas Joly
1.54	19-Mar-2009	pooka	Release dvp in mknod error branch. Nicolas Joly, PR kern/41006
1.53	07-Feb-2009	pooka	branches: 1.53.2; If fdvp is tvp, do nothing. Prevents local DoS panic described in PR kern/38219... maybe. This is hastily concocted fix for 5.0 and I'm not sure if it has side-effects.
1.52	26-Nov-2008	pooka	Rototill all remaining file systems to use ubc_uiomove() instead of the ubc_alloc() - uiomove() - ubc_release() dance.
1.51	19-Jun-2008	christos	branches: 1.51.2; 1.51.4; 1.51.6; - setting the birthdate is valid in setattr. - don't call nanotime if not needed. - don't call tempfs_update() if tempfs_chtimes succeeded, because it just did.
1.50	28-Apr-2008	martin	branches: 1.50.2; 1.50.4; Remove clause 3 and 4 from TNF licenses
1.49	06-Feb-2008	jmmv	branches: 1.49.6; 1.49.8; 1.49.10; Drop trailing whitespace.
1.48	31-Jan-2008	ad	Remove debugging code that's no longer needed.
1.47	30-Jan-2008	ad	Replace struct lock on vnodes with a simpler lock object built on krwlock_t. This is a step towards removing lockmgr and simplifying vnode locking. Discussed on tech-kern.
1.46	25-Jan-2008	ad	Remove VOP_LEASE. Discussed on tech-kern.
1.45	02-Jan-2008	ad	Merge vmlocking2 to head.
1.44	26-Nov-2007	pooka	branches: 1.44.2; 1.44.6; Remove the "struct lwp *" argument from all VFS and VOP interfaces. The general trend is to remove it from all kernel interfaces and this is a start. In case the calling lwp is desired, curlwp should be used. quick consensus on tech-kern
1.43	23-Nov-2007	pooka	Fix a race condition: in case two source paths hardlinked to the same file were renamed simultaneously, there was a window where directory entry cached in the vnode during lookup would be replaced before calling rename. This lead to one directory entry getting renamed twice and the other one getting zero renames. Do a relookup in rename to make sure we have the correct directory entry. Thanks go to Greg Oster for reporting the problem, helping with debugging and thoroughly testing the patch.
1.42	10-Nov-2007	ad	Back out the tmpfs changes; there appears to be a bug lurking.
1.41	06-Nov-2007	ad	Merge from vmlocking.
1.40	23-Oct-2007	dyoung	branches: 1.40.2; Borrow a clue from the vmlocking branch, and consolidate all of the vput(9)ing in tmpfs_rmdir() in one place. No functional change intended.
1.39	23-Jul-2007	jmmv	branches: 1.39.4; 1.39.6; 1.39.10; 1.39.12; Multiple fixes for tmpfs' rename operation: - Raise an error if renaming a file to a directory. - Raise an error if renaming a directory to a file. - Raise an error if renaming a directory to a non-empty directory. - Properly allow renaming a directory to an empty directory. The system could previously crash if the kernel had DIAGNOSTIC enabled, as this triggered a bogus assertion. Problem found by Geoff Wing.
1.38	09-Jul-2007	ad	branches: 1.38.2; Merge some of the less invasive changes from the vmlocking branch: - kthread, callout, devsw API changes - select()/poll() improvements - miscellaneous MT safety improvements
1.37	22-Feb-2007	thorpej	branches: 1.37.4; 1.37.6; TRUE -> true, FALSE -> false
1.36	21-Feb-2007	thorpej	Replace the Mach-derived boolean_t type with the C99 bool type. A future commit will replace use of TRUE and FALSE with true and false.
1.35	04-Jan-2007	elad	branches: 1.35.2; Consistent usage of KAUTH_GENERIC_ISSUSER.
1.34	02-Jan-2007	pooka	* fix locking gotchas when trying to unlink "." * return standard EPERM when trying to unlink a directory * reorder some checks in rmdir avoid problems if trying to rmdir ".." jmmv ok
1.33	09-Dec-2006	chs	a smorgasbord of improvements to vnode locking and path lookup: - LOCKPARENT is no longer relevant for lookup(), relookup() or VOP_LOOKUP(). these now always return the parent vnode locked. namei() works as before. lookup() and various other paths no longer acquire vnode locks in the wrong order via vrele(). fixes PR 32535. as a nice side effect, path lookup is also up to 25% faster. - the above allows us to get rid of PDIRUNLOCK. - also get rid of WANTPARENT (just use LOCKPARENT and unlock it). - remove an assumption in layer_node_find() that all file systems implement a recursive VOP_LOCK() (unionfs doesn't). - require that all file systems supply vfs_vptofh and vfs_fhtovp routines. fill in eopnotsupp() for file systems that don't support being exported and remove the checks for NULL. (layerfs calls these without checking.) - in union_lookup1(), don't change refcounts in the ISDOTDOT case, just adjust which vnode is locked. fixes PR 33374. - apply fixes for ufs_rename() from ufs_vnops.c rev. 1.61 to ext2fs_rename().
1.32	09-Nov-2006	jmmv	branches: 1.32.2; Opening a file after it has been removed (e.g. rmdir $(pwd)) has to fail.
1.31	09-Nov-2006	jmmv	Audit kqueue notifications. The reference behavior is taken from MFS and is represented in the regression tests.
1.30	07-Nov-2006	jmmv	tmpfs_open cannot assume that the node to be open is still linked to a directory, so remove an invalid assertion. Otherwise the kernel incorrectly panics when accessing the current directory after it has been removed.
1.29	05-Nov-2006	jmmv	Truncate directory cookies to 31 bits to avoid problems exposed in Linux binaries which cast the returned values to 64-bits and fail due to sign expansion. More details are provided in the big comment in tmpfs.h that describes how the new tmpfs_dircookie works. This is a rather ugly hack that shall be fixed with a cleaner solution, but this resolves the problem in an effective way. Fixes kern PR/32034.
1.28	02-Nov-2006	jmmv	Make tmpfs_getpages behave as genfs_getpages by ignoring the input pages array's contents and returning all the requested pages. Otherwise there are problems (accessing invalid memory) when the a_m vector is passed uninitialized as the NFS server code does. Fixes PR kern/34959. Note that this is not a "real" fix. While this makes tmpfs's getpages operation consistent with the behavior of other file systems, it does not resolve the different semantics between uvn_get and uao_get as described in PR kern/32166. I'm adding a comment in the code mentioning exactly this so that it can be reviewed when this last problem is addressed.
1.27	30-Oct-2006	jmmv	Update the file's ctime after a rename. Thanks to pooka@.
1.26	30-Oct-2006	jmmv	When renaming a file, we have to modify the mtime of the directory holding it, not the mtime of the file itself. This fixes the problems exposed when unpacking software under a tmpfs and trying to build it because dependencies were not calculated properly (e.g. autoconf 2.60 as reported by tls@).
1.25	23-Jul-2006	ad	branches: 1.25.4; 1.25.6; Use the LWP cached credentials where sane.
1.24	15-May-2006	christos	branches: 1.24.6; kauth fallout
1.23	14-May-2006	elad	integrate kauth.
1.22	21-Feb-2006	christos	branches: 1.22.2; 1.22.4; 1.22.6; PR/31850: Geoff Wing: tmpfs does not honor sticky directories.
1.21	16-Feb-2006	jmmv	Do not use unnamed structures/unions without instances; they break the build under vax because of gcc 2.95. Found by he@.
1.20	26-Jan-2006	jmmv	branches: 1.20.2; 1.20.4; Cut a too long line introduced during the conversion to lwps.
1.19	11-Dec-2005	christos	branches: 1.19.2; merge ktrace-lwp.
1.18	29-Nov-2005	yamt	merge yamt-readahead branch.
1.17	02-Nov-2005	yamt	branches: 1.17.2; 1.17.4; merge yamt-vop branch. remove following VOPs. VOP_BLKATOFF VOP_VALLOC VOP_BALLOC VOP_REALLOCBLKS VOP_VFREE VOP_TRUNCATE VOP_UPDATE
1.16	03-Oct-2005	jmmv	branches: 1.16.2; Follow symlinks during lookup (i.e., don't stop too early) so that symlinks to directories work as expected. Diagnosed by Greg Oster.
1.15	29-Sep-2005	jmmv	Implement the tmpfs_advlock operation. Makes "user-level" file locking work (aka lockf(3)).
1.14	28-Sep-2005	yamt	tmpfs_getattr: return up-to-date timestamps.
1.13	26-Sep-2005	yamt	tmpfs_rename: fix lock/unlock mismatch.
1.12	23-Sep-2005	jmmv	Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.11	23-Sep-2005	jmmv	Lock the source directory during the rename operation so that we are safe to modify it (I hope this is the correct way to go). Avoids triggering an assertion in the tmpfs_dir_detach function, shown by the t_rename regression test.
1.10	15-Sep-2005	yamt	change the way to handle directory "offsets" so that they won't be changed when removing entries in the directory. some applications like cvs rely on this.
1.9	14-Sep-2005	yamt	tmpfs_getpages: don't create pages past eof.
1.8	14-Sep-2005	yamt	tmpfs_read: handle requests past EOF.
1.7	13-Sep-2005	jmmv	Adapt recent changes to the style of the rest of the file.
1.6	13-Sep-2005	yamt	- don't waste/leak kva. - implement getpages/putpages. support mmap. - eliminate meaningless memcpy. - ubcify.
1.5	13-Sep-2005	yamt	tmpfs_read: return EISDIR rather than EINVAL for non-VREG files. XXX should we follow nfs, which uses EPERM?
1.4	13-Sep-2005	yamt	tmpfs_link: always free pnbuf.
1.3	12-Sep-2005	christos	convert to use it nanotime, but don't call it unless it is necessary.
1.2	10-Sep-2005	jmmv	wiz@ remembers that the preferred way to spell file-system in NetBSD is file system.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.16.2.2	29-Oct-2005	yamt	as tmpfs_update never fails, make it return void. suggested by Chuck Silvers.
1.16.2.1	20-Oct-2005	yamt	adapt tmpfs.
1.17.4.1	19-Nov-2005	yamt	- as read-ahead context is per-vnode now, there are less reasons to make VOP_READ call uvm_ra_request explicitly. move it to pager (uvn_get) so that it can handle accesses via mmap as well. - pass advice to pager via ubc. - tweak DPRINTF. XXX can be disturbed by PGO_LOCKED. XXX it's controversial where it should be done. (uvm_fault, uvn_get or genfs_getpages.)
1.17.2.4	11-Dec-2005	christos	Sync with head.
1.17.2.3	12-Nov-2005	skrll	Adapt to branch
1.17.2.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.17.2.1	02-Nov-2005	skrll	file tmpfs_vnops.c was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.19.2.3	01-Mar-2006	yamt	sync with head.
1.19.2.2	18-Feb-2006	yamt	sync with head.
1.19.2.1	01-Feb-2006	yamt	sync with head.
1.20.4.2	01-Jun-2006	kardel	Sync with head.
1.20.4.1	22-Apr-2006	simonb	Sync with head.
1.20.2.1	09-Sep-2006	rpaulo	sync with head
1.22.6.1	24-May-2006	tron	Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
1.22.4.2	18-Apr-2006	elad	adapt to kauth, pointed out by yamt@, thanks!
1.22.4.1	08-Mar-2006	elad	Adapt to kernel authorization KPI.
1.22.2.2	11-Aug-2006	yamt	sync with head
1.22.2.1	24-May-2006	yamt	sync with head.
1.24.6.10	11-Feb-2008	yamt	sync with head.
1.24.6.9	04-Feb-2008	yamt	sync with head.
1.24.6.8	21-Jan-2008	yamt	sync with head
1.24.6.7	07-Dec-2007	yamt	sync with head
1.24.6.6	27-Oct-2007	yamt	sync with head.
1.24.6.5	03-Sep-2007	yamt	sync with head.
1.24.6.4	26-Feb-2007	yamt	sync with head.
1.24.6.3	30-Dec-2006	yamt	sync with head.
1.24.6.2	21-Jun-2006	yamt	sync with head.
1.24.6.1	15-May-2006	yamt	file tmpfs_vnops.c was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.25.6.1	10-Dec-2006	yamt	sync with head.
1.25.4.2	12-Jan-2007	ad	Sync with head.
1.25.4.1	18-Nov-2006	ad	Sync with head.
1.32.2.4	01-Feb-2008	riz	Pull up following revision(s) (requested by pooka in ticket #1010): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.43 Fix a race condition: in case two source paths hardlinked to the same file were renamed simultaneously, there was a window where directory entry cached in the vnode during lookup would be replaced before calling rename. This lead to one directory entry getting renamed twice and the other one getting zero renames. Do a relookup in rename to make sure we have the correct directory entry. Thanks go to Greg Oster for reporting the problem, helping with debugging and thoroughly testing the patch.
1.32.2.3	24-Jul-2007	liamjfoy	Pull up following revision(s) (requested by jmmv in ticket #786): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.39 regress/sys/fs/tmpfs/h_tools.c: revision 1.8 regress/sys/fs/tmpfs/t_rename: revision 1.6 regress/sys/fs/tmpfs/t_rename: revision 1.7 Add test cases to ensure that: 1) Renaming a directory to an empty directory works by replacing the target directory. 2) Renaming a directory to a non-empty directory fails. This is all by calling rename(2) directly, not mv(1). tmpfs currently fails those tests, raising an assertion if DIAGNOSTIC is enabled. A fix will hopefully follow soon. Found by pooka@. Add some more tests to ensure that renaming a file to a directory and a directory to a file fails with the appropriate error codes. tmpfs still fails these tests, but the fix is almost ready to go in. Multiple fixes for tmpfs' rename operation: - Raise an error if renaming a file to a directory. - Raise an error if renaming a directory to a file. - Raise an error if renaming a directory to a non-empty directory. - Properly allow renaming a directory to an empty directory. The system could previously crash if the kernel had DIAGNOSTIC enabled, as this triggered a bogus assertion. Problem found by Geoff Wing.
1.32.2.2	17-Feb-2007	tron	branches: 1.32.2.2.2; Apply patch (requested by chs in ticket #422): - Fix various deadlock problems with nullfs and unionfs. - Speed up path lookups by upto 25%.
1.32.2.1	04-Jan-2007	bouyer	Pull up following revision(s) (requested by pooka in ticket #324): regress/sys/fs/tmpfs/t_remove: revision 1.8 sys/fs/tmpfs/tmpfs_vnops.c: revision 1.34 * fix locking gotchas when trying to unlink "." * return standard EPERM when trying to unlink a directory * reorder some checks in rmdir avoid problems if trying to rmdir ".." * add a test to check that unlink of "." is not succesful
1.32.2.2.2.2	03-Jun-2008	skrll	Sync with netbsd-4.
1.32.2.2.2.1	03-Sep-2007	wrstuden	Sync w/ NetBSD-4-RC_1
1.35.2.1	27-Feb-2007	yamt	- sync with head. - move sched_changepri back to kern_synch.c as it doesn't know PPQ anymore.
1.37.6.1	11-Jul-2007	mjf	Sync with head.
1.37.4.8	01-Nov-2007	ad	Disable the leaked node KASSERT in tmpfs_rmdir for the time being.
1.37.4.7	18-Oct-2007	ad	tmpfs_rmdir: move assertion to catch leaked tmpfs_nodes to the correct spot.
1.37.4.6	08-Oct-2007	ad	- Don't leave nodes dangling in order to keep track of the inode generation number. Free them back to the pool as soon as the referenced file becomes unused. Using arc4random() for the generation and ino_t based off the node's in-core address is just about as as good as a disk-based file system is going to give. - Add assertion to catch empty directories with linkcount > 1 being freed. This fires frequently but I haven't tracked the bug down yet.. - Use kmem_alloc.
1.37.4.5	16-Sep-2007	ad	Checkpoint work in progress on the vnode lifecycle and reference counting stuff. This makes it work properly without kernel_lock and fixes a few quite old bugs. See vfs_subr.c 1.283.2.17 for details.
1.37.4.4	22-Aug-2007	ad	Fix some more concurrency problems.
1.37.4.3	20-Aug-2007	ad	Sync with HEAD.
1.37.4.2	13-May-2007	ad	- Pass the error number and residual count to biodone(), and let it handle setting error indicators. Prepare to eliminate B_ERROR. - Add a flag argument to brelse() to be set into the buf's flags, instead of doing it directly. Typically used to set B_INVAL. - Add a "struct cpu_info *" argument to kthread_create(), to be used to create bound threads. Change "bool mpsafe" to "int flags". - Allow exit of LWPs in the IDL state when (l != curlwp). - More locking fixes & conversion to the new API.
1.37.4.1	21-Mar-2007	ad	GC the simplelock/spinlock debugging stuff.
1.38.2.1	15-Aug-2007	skrll	Sync with HEAD.
1.39.12.2	23-Jul-2007	jmmv	Multiple fixes for tmpfs' rename operation: - Raise an error if renaming a file to a directory. - Raise an error if renaming a directory to a file. - Raise an error if renaming a directory to a non-empty directory. - Properly allow renaming a directory to an empty directory. The system could previously crash if the kernel had DIAGNOSTIC enabled, as this triggered a bogus assertion. Problem found by Geoff Wing.
1.39.12.1	23-Jul-2007	jmmv	file tmpfs_vnops.c was added on branch matt-mips64 on 2007-07-23 15:41:02 +0000
1.39.10.1	13-Nov-2007	bouyer	Sync with HEAD
1.39.6.4	23-Mar-2008	matt	sync with HEAD
1.39.6.3	09-Jan-2008	matt	sync with HEAD
1.39.6.2	08-Nov-2007	matt	sync with -HEAD
1.39.6.1	06-Nov-2007	matt	sync with HEAD
1.39.4.4	27-Nov-2007	joerg	Sync with HEAD. amd64 Xen support needs testing.
1.39.4.3	11-Nov-2007	joerg	Sync with HEAD.
1.39.4.2	06-Nov-2007	joerg	Sync with HEAD.
1.39.4.1	26-Oct-2007	joerg	Sync with HEAD. Follow the merge of pmap.c on i386 and amd64 and move pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup code to restore CR4 before jumping back into kernel space as the large page option might cover that.
1.40.2.3	18-Feb-2008	mjf	Sync with HEAD.
1.40.2.2	08-Dec-2007	mjf	Sync with HEAD.
1.40.2.1	19-Nov-2007	mjf	Sync with HEAD.
1.44.6.1	02-Jan-2008	bouyer	Sync with HEAD
1.44.2.11	27-Dec-2007	ad	Uninit variable warning
1.44.2.10	27-Dec-2007	ad	tmpfs_rename: don't free garbage if failing a cross-device rename.
1.44.2.9	27-Dec-2007	ad	tmpfs_rename: reject cross-mount renames before doing anything else.
1.44.2.8	22-Dec-2007	ad	Fix error in previous.
1.44.2.7	22-Dec-2007	ad	tmpfs_rename: fix a couple more problems.
1.44.2.6	13-Dec-2007	ad	Kill tn_lookup_dirent and find the correct node using the supplied componentname.
1.44.2.5	13-Dec-2007	yamt	tmpfs_lookup: don't bother to cache dotdot entry. fixes rename.
1.44.2.4	13-Dec-2007	yamt	tmpfs_rmdir: fix an assertion.
1.44.2.3	12-Dec-2007	ad	Minor corrections to previous.
1.44.2.2	12-Dec-2007	ad	- Don't use LK_RETRY in tmpfs_alloc_vp(). - Reduce cosmetic diffs to head.
1.44.2.1	04-Dec-2007	ad	Pull the vmlocking changes into a new branch.
1.49.10.6	11-Aug-2010	yamt	sync with head.
1.49.10.5	11-Mar-2010	yamt	sync with head
1.49.10.4	16-Sep-2009	yamt	sync with head
1.49.10.3	18-Jul-2009	yamt	sync with head.
1.49.10.2	04-May-2009	yamt	sync with head.
1.49.10.1	16-May-2008	yamt	sync with head.
1.49.8.1	18-May-2008	yamt	sync with head.
1.49.6.3	17-Jan-2009	mjf	Sync with HEAD.
1.49.6.2	29-Jun-2008	mjf	Sync with HEAD.
1.49.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.50.4.1	27-Jun-2008	simonb	Sync with head.
1.50.2.1	23-Jun-2008	wrstuden	Sync w/ -current. 34 merge conflicts to follow.
1.51.6.6	07-Dec-2009	snj	Pull up following revision(s) (requested by rmind in ticket #1072): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.63 tmpfs_rename: handle hard-links correctly. Fixes PR/41236.
1.51.6.5	19-Apr-2009	snj	branches: 1.51.6.5.4; Pull up following revision(s) (requested by ad in ticket #690): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.58 plug some pnbuf leaks.
1.51.6.4	19-Apr-2009	snj	Pull up following revision(s) (requested by christos in ticket #690): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.57 SAVENAME was not set for rename and delete as required Patch from christos, fixes pr 41183
1.51.6.3	08-Apr-2009	snj	Pull up following revision(s) (requested by tron in ticket #680): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.55 Fix yet another recent crashy bug in tmpfs rename: since the source dirent is no longer cached in lookup and we do the lookup ourselves in rename, we are most definitely not allowed to assert that it matches the source vnode passed as an argument. In case the source node does not exist or has been replaced, punt with ENOENT. Also, nuke some misleading prehistoric comments which haven't been valid in over a year. Fixes PR kern/41128 by Nicolas Joly
1.51.6.2	24-Mar-2009	snj	Pull up following revision(s) (requested by pooka in ticket #590): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.54 Release dvp in mknod error branch. Nicolas Joly, PR kern/41006
1.51.6.1	16-Feb-2009	snj	Pull up following revision(s) (requested by pooka in ticket #432): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.53 If fdvp is tvp, do nothing. Prevents local DoS panic described in PR kern/38219... maybe. This is hastily concocted fix for 5.0 and I'm not sure if it has side-effects.
1.51.6.5.4.1	21-Apr-2010	matt	sync to netbsd-5
1.51.4.3	28-Apr-2009	skrll	Sync with HEAD.
1.51.4.2	03-Mar-2009	skrll	Sync with HEAD.
1.51.4.1	19-Jan-2009	skrll	Sync with HEAD.
1.51.2.1	13-Dec-2008	haad	Update haad-dm branch to haad-dm-base2.
1.53.2.2	23-Jul-2009	jym	Sync with HEAD.
1.53.2.1	13-May-2009	jym	Sync with HEAD. Commit is split, to avoid a "too many arguments" protocol error.
1.66.4.6	31-May-2011	rmind	sync with head
1.66.4.5	19-May-2011	rmind	Implement sharing of vnode_t::v_interlock amongst vnodes: - Lock is shared amongst UVM objects using uvm_obj_setlock() or getnewvnode(). - Adjust vnode cache to handle unsharing, add VI_LOCKSHARE flag for that. - Use sharing in tmpfs and layerfs for underlying object. - Simplify locking in ubc_fault(). - Sprinkle some asserts. Discussed with ad@.
1.66.4.4	05-Mar-2011	rmind	sync with head
1.66.4.3	03-Jul-2010	rmind	sync with head
1.66.4.2	30-May-2010	rmind	sync with head
1.66.4.1	16-Mar-2010	rmind	Change struct uvm_object::vmobjlock to be dynamically allocated with mutex_obj_alloc(). It allows us to share the locks among UVM objects.
1.66.2.2	17-Aug-2010	uebayasi	Sync with HEAD.
1.66.2.1	30-Apr-2010	uebayasi	Sync with HEAD.
1.76.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.86.2.1	23-Jun-2011	cherry	Catchup with rmind-uvmplock merge.
1.92.2.7	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.92.2.6	16-Jan-2013	yamt	sync with (a bit old) head
1.92.2.5	30-Oct-2012	yamt	sync with head
1.92.2.4	23-May-2012	yamt	sync with head.
1.92.2.3	17-Apr-2012	yamt	sync with head
1.92.2.2	25-Jan-2012	yamt	uvm_loanabj: take an access pattern hint.
1.92.2.1	04-Jan-2012	yamt	enable O->A loaning read for a few filesystems.
1.93.4.6	02-Jun-2012	mrg	sync to latest -current.
1.93.4.5	05-Apr-2012	mrg	sync to latest -current.
1.93.4.4	06-Mar-2012	mrg	sync to -current
1.93.4.3	06-Mar-2012	mrg	sync to -current
1.93.4.2	04-Mar-2012	mrg	sync to latest -current.
1.93.4.1	18-Feb-2012	mrg	merge to -current.
1.94.2.2	12-Aug-2012	martin	Pull up following revision(s) (requested by manu in ticket #484): sys/fs/nilfs/nilfs_vnops.c: revision 1.18 sys/ufs/ufs/ufs_lookup.c: revision 1.117 sys/nfs/nfs_vnops.c: revision 1.295 sys/ufs/chfs/chfs_vnops.c: revision 1.8 sys/ufs/ext2fs/ext2fs_lookup.c: revision 1.70 sys/fs/unionfs/unionfs_vnops.c: revision 1.6 sys/kern/vfs_cache.c: revision 1.89 sys/fs/efs/efs_vnops.c: revision 1.26 sys/fs/hfs/hfs_vnops.c: revision 1.26 sys/fs/adosfs/adlookup.c: revision 1.16 sys/fs/puffs/puffs_vnops.c: revision 1.168 sys/fs/tmpfs/tmpfs_vnops.c: revision 1.98 sys/fs/ntfs/ntfs_vnops.c: revision 1.52 sys/fs/cd9660/cd9660_lookup.c: revision 1.20 sys/fs/msdosfs/msdosfs_lookup.c: revision 1.24 sys/fs/smbfs/smbfs_vnops.c: revision 1.80 sys/fs/udf/udf_vnops.c: revision 1.72 sys/fs/filecorefs/filecore_lookup.c: revision 1.14 sys/fs/puffs/puffs_node.c: revision 1.25 Move some the test for MAKEENTRY into the cache_enter(9). Make some variables in vfs_cache.c static, __read_mostly, etc. No objection on tech-kern@.
1.94.2.1	27-Feb-2012	riz	Pull up following revision(s) (requested by chs in ticket #58): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.95 in tmpfs_readdir(), skip the . and .. processing on removed directories, since the latter will crash in this case.
1.98.2.4	03-Dec-2017	jdolecek	update from HEAD
1.98.2.3	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.98.2.2	23-Jun-2013	tls	resync from head
1.98.2.1	20-Nov-2012	tls	Resync to 2012-11-19 00:00:00 UTC
1.101.6.1	18-May-2014	rmind	sync with head
1.118.2.1	10-Aug-2014	tls	Rebase.
1.120.2.3	10-May-2016	snj	Pull up following revision(s) (requested by joerg in ticket #1163): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.125 do not access uninitialized variables in KASSERTs - fixes build
1.120.2.2	09-May-2016	snj	Pull up following revision(s) (requested by joerg in ticket #1163): sys/fs/tmpfs/tmpfs_vfsops.c: revision 1.66, 1.67 sys/fs/tmpfs/tmpfs_vnops.c: revision 1.124 Only recheck size/node limits on update mounts, if there actually have been specified. -- Implement most of mount -ur functionality for tmpfs. Remaining issue is the question who is responsible for syncing pending writes, but the functionality is good enough for serving as read-only chroot base in bulk builds.
1.120.2.1	22-Dec-2014	msaitoh	Pull up following revision(s) (requested by gson in ticket #344): sys/fs/tmpfs/tmpfs_vnops.c: revision 1.121 sys/fs/tmpfs/tmpfs_subr.c: revision 1.97 Store symlinks without a NUL terminator so that lstat(2) returns the correct length. Fixes the tmpfs part of PR kern/48864.
1.121.2.6	28-Aug-2017	skrll	Sync with HEAD
1.121.2.5	05-Feb-2017	skrll	Sync with HEAD
1.121.2.4	05-Oct-2016	skrll	Sync with HEAD
1.121.2.3	19-Mar-2016	skrll	Sync with HEAD
1.121.2.2	22-Sep-2015	skrll	Sync with HEAD
1.121.2.1	06-Jun-2015	skrll	Sync with HEAD
1.127.2.2	26-Apr-2017	pgoyette	Sync with HEAD
1.127.2.1	20-Mar-2017	pgoyette	Sync with HEAD
1.129.2.1	21-Apr-2017	bouyer	Sync with HEAD
1.133.16.1	29-Feb-2020	ad	Sync with head.
1.133.10.1	08-Apr-2020	martin	Merge changes from current as of 20200406
1.135.2.1	25-Apr-2020	bouyer	Sync with bouyer-xenpvh-base2 (HEAD)
1.144.2.1	14-Dec-2020	thorpej	Sync w/ HEAD.
1.145.4.1	01-Aug-2021	thorpej	Sync with HEAD.
1.14	18-Jul-2021	dholland	Abolish all the silly indirection macros for initializing vnode ops tables. These are things of the form #define foofs_op genfs_op, or #define foofs_op genfs_eopnotsupp, or similar. They serve no purpose besides obfuscation, and have gotten cutpasted all over everywhere.
1.13	24-May-2011	rmind	branches: 1.13.72; - Describe some locking. - Add VOP argument comments, add some asserts. - Update/fix/remove outdated/missleading comments. - Clean up, de-indent, KNF, misc. No functional changes intended.
1.12	13-Jan-2011	pooka	branches: 1.12.2; Add some support for unionfs (not built by default). It's still missing at least opaque directory support, but until someone figures out how that should work on ffs (see PR kern/kern/44383), there's no point in trying to figure out how it should work here.
1.11	28-Apr-2008	martin	branches: 1.11.22; Remove clause 3 and 4 from TNF licenses
1.10	25-Jan-2008	ad	branches: 1.10.6; 1.10.8; 1.10.10; Remove VOP_LEASE. Discussed on tech-kern.
1.9	09-Nov-2006	jmmv	branches: 1.9.24; 1.9.30; Add 2006 to the copyright notice; should have done this when touching the files before.
1.8	09-Nov-2006	jmmv	Audit kqueue notifications. The reference behavior is taken from MFS and is represented in the regression tests.
1.7	03-Dec-2005	christos	branches: 1.7.18; 1.7.22; 1.7.24; - protect userland exported files against multiple inclusion. - make sure that kernel only files don't compile in userland using #error - XXX: some kernel only files still get installed. - XXX: some files used in userland, don't get installed.
1.6	02-Nov-2005	yamt	branches: 1.6.2; merge yamt-vop branch. remove following VOPs. VOP_BLKATOFF VOP_VALLOC VOP_BALLOC VOP_REALLOCBLKS VOP_VFREE VOP_TRUNCATE VOP_UPDATE
1.5	29-Sep-2005	jmmv	branches: 1.5.2; Implement the tmpfs_advlock operation. Makes "user-level" file locking work (aka lockf(3)).
1.4	23-Sep-2005	jmmv	Kill the tmpfs(9) manual page; it was just documenting internal details of tmpfs' "API" and was already rotting. Instead, merge all the relevant comments into the code. This includes acknowledgements to Google's Summer of Code 2005 program (they were in the AUTHORS section of tmpfs(9) before), so all the files need to be changed to include this sentence alongside the title. (Note that this was not a requirement of the program.)
1.3	13-Sep-2005	yamt	- don't waste/leak kva. - implement getpages/putpages. support mmap. - eliminate meaningless memcpy. - ubcify.
1.2	12-Sep-2005	yamt	fix lock/unlock mismatch. XXX this is not a real fix.
1.1	10-Sep-2005	jmmv	Initial addition of tmpfs, an efficient memory file-system. This project was developed as part of Google's Summer of Code 2005 program. This change adds the kernel code, the mount_tmpfs utility, a regression test suite and does all other related changes to integrate these. The file-system is still experimental. Therefore, it is disabled by default in all kernels. However, as typically done, a commented-out entry is added in them to ease its setup. Note that I haven't commited the required mountd(8) changes to be able to export tmpfs file-systems because NFS support is still very unstable and because, before enabling it, I'd like to do some other changes. OK'ed by my project mentor, William Studenmund (wrstuden@).
1.5.2.1	20-Oct-2005	yamt	adapt tmpfs.
1.6.2.3	11-Dec-2005	christos	Sync with head.
1.6.2.2	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.6.2.1	02-Nov-2005	skrll	file tmpfs_vnops.h was added on branch ktrace-lwp on 2005-11-10 14:09:44 +0000
1.7.24.1	10-Dec-2006	yamt	sync with head.
1.7.22.1	18-Nov-2006	ad	Sync with head.
1.7.18.4	04-Feb-2008	yamt	sync with head.
1.7.18.3	30-Dec-2006	yamt	sync with head.
1.7.18.2	21-Jun-2006	yamt	sync with head.
1.7.18.1	03-Dec-2005	yamt	file tmpfs_vnops.h was added on branch yamt-lazymbuf on 2006-06-21 15:09:36 +0000
1.9.30.1	18-Feb-2008	mjf	Sync with HEAD.
1.9.24.1	23-Mar-2008	matt	sync with HEAD
1.10.10.1	16-May-2008	yamt	sync with head.
1.10.8.1	18-May-2008	yamt	sync with head.
1.10.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.11.22.2	31-May-2011	rmind	sync with head
1.11.22.1	05-Mar-2011	rmind	sync with head
1.12.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.13.72.1	01-Aug-2021	thorpej	Sync with HEAD.

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