Cross Reference: /src/sys/miscfs/specfs

History log of /src/sys/miscfs/specfs
Revision	Date	Author	Comments
1.1	12-Jun-1998	cgd	Rework the way kernel include files are installed. In the new method, as with user-land programs, include files are installed by each directory in the tree that has includes to install. (This allows more flexibility as to what gets installed, makes 'partial installs' easier, and gives us more options as to which machines' includes get installed at any given time.) The old SYS_INCLUDES={symlinks,copies} behaviours are _both_ still supported, though at least one bug in the 'symlinks' case is fixed by this change. Include files can't be build before installation, so directories that have includes as targets (e.g. dev/pci) have to move those targets into a different Makefile.
1.219	06-Jan-2025	mlelstv	Use correct type function for block and character devices. Use DIOCGMEDIASSIZE ioctl when no partition info is available to generate st_size information. This helps dk(4) and dm(4) devices.
1.218	22-Apr-2023	riastradh	branches: 1.218.6; specfs: KNF. No functional change intended.
1.217	22-Apr-2023	hannken	Remove unused specdev member sd_rdev. Ride 10.99.4
1.216	15-Oct-2022	riastradh	specfs(9): Attribute blame by stack trace for write to r/o medium.
1.215	21-Sep-2022	riastradh	specfs(9): XXX comment: what if read downgrades lock?
1.214	12-Aug-2022	riastradh	specfs: Refuse to open a closing-in-progress block device. We could wait for close to complete, but if this happened ever so slightly earlier it would lead to EBUSY anyway, so there's no point in adding logic for that -- either way the caller neglected to wait for the last close to finish before trying to open it the device again. https://mail-index.netbsd.org/current-users/2022/08/09/msg042800.html Reported-by: syzbot+4388f20706ec8a4c8db0@syzkaller.appspotmail.com https://syzkaller.appspot.com/bug?id=47c67ab6d3a87514d0707882a9ad6671beaa8642 Reported-by: syzbot+0f1756652dce4cb341ed@syzkaller.appspotmail.com https://syzkaller.appspot.com/bug?id=a632ce762d64241fc82a9bc57230b7b7c7095d1a
1.213	12-Aug-2022	riastradh	specfs: Assert !closing on successful open. - If there's a prior concurrent close, it must have interrupted this open. - If there's a new concurrent close, it must wait until this open has released device_lock before it can revoke.
1.212	12-Aug-2022	riastradh	specfs: Assert opencnt>0 on successful open.
1.211	11-Aug-2022	riastradh	specfs: Sprinkle opencnt/opened/closing assertions. There seems to be a bug here but I'm not sure what it is yet: https://mail-index.netbsd.org/current-users/2022/08/09/msg042800.html https://syzkaller.appspot.com/bug?id=47c67ab6d3a87514d0707882a9ad6671beaa8642 The decision to actually invoke d_close is serialized under device_lock, so it should not be possible for more than one process to close at the same time, but syzbot and kre found a way for sd_closing to be false later in spec_close. Let's make sure it's false when we're making what should be the exclusive decision to close. We can't assert !sd_opened before cancel and spec_io_drain, because those are necessary to interrupt and wait for pending opens that might later set sd_opened, but we can assert !sd_opened afterward because once sd_closing is true nothing should set sd_opened.
1.210	28-Mar-2022	riastradh	driver(9): New devsw d_cancel op to interrupt I/O before close. If specified, when revoking a device node or closing its last open node, specfs will: 1. Call d_cancel, which should return promptly without blocking. 2. Wait for all concurrent d_read/write/ioctl/&c. to drain. 3. Call d_close. Otherwise, specfs will: 1. Call d_close. 2. Wait for all concurrent d_read/write/ioctl/&c. to drain. This fallback is problematic because often parts of d_close rely on concurrent devsw operations to have completed already, so it is up to each driver to have its own mechanism for waiting, and the extra step in (2) is almost redundant. But it is still important to ensure that devsw operations are not active by the time a module tries to invoke devsw_detach, because only d_open is protected against that. The signature of d_cancel matches d_close, mostly so we don't raise questions about `why is this different?'; the lwp argument is not useful but we should remove it from open/cancel/close all at the same time. The only way d_cancel should fail, if it does at all, is with ENODEV, meaning the driver doesn't support cancelling outstanding I/O, and will take responsibility for that in d_close. I would make it return void and only have bdev_cancel and cdev_cancel possibly return ENODEV so specfs can detect whether a driver supports it, but this would break the pattern around devsw operation types. Drivers are allowed to omit it from struct bdevsw, struct cdevsw -- if so, it is as if they used a function that just returns ENODEV. XXX kernel ABI change to struct bdevsw/cdevsw requires bump
1.209	28-Mar-2022	riastradh	specfs: Remove specnode from hash table in spec_node_revoke. Previously, it was possible for spec_node_lookup_by_dev to handle a speconde that a concurrent spec_node_destroy is about to remove from the hash table and then free, as soon as spec_node_lookup_by_dev releases device_lock. Now, the ordering is: 1. Remove specnode from hash table in spec_node_revoke. At this point, no _new_ vnode references are possible (other than possibly one acquired by vcache_vget under v_interlock), but there may be existing ones. 2. Mark vnode reclaimed so vcache_vget will fail. 3. The last vrele (or equivalent logic in vcache_vget) will then free the specnode in spec_node_destroy. This way, _if_ a thread in spec_node_lookup_by_dev finds a specnode in the hash table under device_lock/v_interlock, _then_ it will not be freed until the thread completes vcache_vget. This change requires calling spec_node_revoke unconditionally for device special nodes, not just for active ones. Might introduce slightly more contention on device_lock but not much because we already have to take it in this path anyway a little later in spec_node_destroy.
1.208	28-Mar-2022	riastradh	specfs: Let spec_node_lookup_by_dev wait for reclaim to finish. vdevgone relies on this to ensure that if there is a concurrent revoke in progress, it will wait for that revoke to finish -- that way, it can guarantee all I/O operations have completed and the device is closed.
1.207	28-Mar-2022	riastradh	specfs: Assert opencnt is nonzero before decrementing.
1.206	28-Mar-2022	riastradh	specfs: Take an I/O reference across bdev/cdev_open. - Revoke is used to invalidate all prior access control checks when device permissions are changing, so it must wait for .d_open to exit so any new access must go through new access control checks. - Revoke is used by vdevgone in xyz_detach to wait until all use of the driver's data structures have completed before xyz_detach frees them. So we need to make sure spec_close waits for .d_open too.
1.205	28-Mar-2022	riastradh	specfs: Wait for last close in spec_node_revoke. Otherwise, revoke -- and vdevgone, in the detach path of removable devices -- may complete while I/O operations are still running concurrently.
1.204	28-Mar-2022	riastradh	specfs: Prevent new opens while close is waiting to drain. Otherwise, bdev/cdev_close could have cancelled all _existing_ opens, and waited for them to complete (and freed resources used by them) -- but a new one could start, and hang (e.g., a tty), at the same time spec_close tries to drain all pending I/O operations, one of which (the new open) is now hanging indefinitely. Preventing the new open from even starting until bdev/cdev_close is finished and all I/O operations have drained avoids this deadlock.
1.203	28-Mar-2022	riastradh	specfs: Take an I/O reference in spec_node_setmountedfs. This is not quite correct. We _should_ require the caller to hold a vnode lock around spec_node_getmountedfs, and an exclusive vnode lock around spec_node_setmountedfs, so that it is only necessary to check whether revoke has already happened, not hold an I/O reference. Unfortunately, various callers in various file systems don't follow this sensible rule. So let's at least make sure the vnode can't be revoked in spec_node_setmountedfs, while we're in bdev_ioctl, and leave a comment explaining what the sorry state of affairs is and how to fix it later.
1.202	28-Mar-2022	riastradh	specfs: Drain all I/O operations after last .d_close call. New kind of I/O reference on specdevs, sd_iocnt. This could be done with psref instead; I chose a reference count instead for now because we already have to take a per-object lock anyway, v_interlock, for vdead_check, so another atomic is not likely to hurt much more. We can always change the mechanism inside spec_io_enter/exit/drain later on. Make sure every access to vp->v_rdev or vp->v_specnode and every call to a devsw operation is protected either: - by the vnode lock (with vdead_check if we unlocked/relocked), - by positive sd_opencnt, - by spec_io_enter/exit, or - by sd_opencnt management in open/close.
1.201	28-Mar-2022	riastradh	specfs: Resolve a race between close and a failing reopen.
1.200	28-Mar-2022	riastradh	specfs: Paranoia: Assert opencnt is zero on reclaim.
1.199	28-Mar-2022	riastradh	specfs: Omit needless vdead_check in spec_fdiscard. The vnode lock is held, so the vnode cannot be revoked without also changing v_op so subsequent uses under the vnode lock will go to deadfs's VOP_FDISCARD instead (which is genfs_eopnotsupp).
1.198	28-Mar-2022	riastradh	specfs: Add a comment and assertion to spec_close about refcnts.
1.197	28-Mar-2022	riastradh	specfs: If sd_opencnt is zero, sn_opencnt had better be zero.
1.196	28-Mar-2022	riastradh	specfs: Factor KASSERT out of switch in spec_open. No functional change.
1.195	28-Mar-2022	riastradh	specfs: sn_gone cannot be set while we hold the vnode lock. Revoke runs with the vnode lock too, which is exclusive. Add an assertion to this effect in spec_node_revoke to make it clear.
1.194	28-Mar-2022	riastradh	specfs: Reorganize D_DISK tail of spec_open and explain what's up. No functional change intended.
1.193	28-Mar-2022	riastradh	specfs: Factor VOP_UNLOCK/vn_lock out of switch for clarity. No functional change.
1.192	28-Mar-2022	riastradh	specfs: Factor common device_lock out of switch for clarity. No functional change.
1.191	28-Mar-2022	riastradh	specfs: Delete bogus comment about .d_open/.d_close at same time. Annoying as it is that .d_open and .d_close can run at the same time, it is also necessary for tty semantics, where open can block indefinitely, and it is the responsibility of close (called via revoke) necessary to interrupt it.
1.190	28-Mar-2022	riastradh	specfs: Split spec_open switch into three sections. The sections are now: 1. Acquire open reference. 1a (intermezzo). Set VV_ISTTY. 2. Drop the vnode lock to call .d_open and autoload modules if necessary. 3. Handle concurrent revoke if it happenend, or release open reference if .d_open failed. No functional change. Sprinkle comments about problems.
1.189	28-Mar-2022	riastradh	specfs: Factor common kauth check out of switch in spec_open. No functional change.
1.188	28-Mar-2022	riastradh	specfs: Assert v_type is VBLK or VCHR in spec_open. Nothing else makes sense. Prune dead branches (and replace default case by panic).
1.187	28-Mar-2022	riastradh	specfs: Call bdev_open without the vnode lock. There is no need for it to serialize opens, because they are already serialized by sd_opencnt which for block devices is always either 0 or 1. There's not obviously any other reason why the vnode lock should be held across bdev_open, other than that it might be nice to avoid dropping it if not necessary. For character devices we always have to drop the vnode lock because open might hang indefinitely, when opening a tty, which is not allowed while holding the vnode lock.
1.186	28-Mar-2022	riastradh	specfs: Note lock order for vnode lock, device_lock, v_interlock.
1.185	28-Mar-2022	riastradh	driver(9): Eliminate D_MCLOSE. D_MCLOSE was introduced a few years ago by mistake for audio(4), which should have used -- and now does use -- fd_clone to create per-open state. The semantics was originally to call close once every time the device node is closed, not only for the last close. Nothing uses it any more, and it complicates reasoning about the system, so let's simplify it away.
1.184	19-Mar-2022	hannken	Switch spec_vnodeop vector to real vnode locking, VV_LOCKSWORK now.
1.183	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.
1.182	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.
1.181	25-Dec-2020	mlelstv	branches: 1.181.4; When reading from a block device, queue parallel block requests to fill a buffer with breadn.
1.180	27-Jun-2020	christos	branches: 1.180.2; Introduce genfs_pathconf() and use it for the default case in all filesystems.
1.179	23-May-2020	ad	Move proc_lock into the data segment. It was dynamically allocated because at the time we had mutex_obj_alloc() but not __cacheline_aligned.
1.178	16-May-2020	christos	Add ACL support for FFS. From FreeBSD.
1.177	13-Apr-2020	jdolecek	when determining I/O block size for VBLK device, only use pi_bsize returned by DIOCGPARTINFO if it's bigger than DEV_BSIZE and less than MAXBSIZE (MAXPHYS) fixes panic "buf mem pool index 8" in buf_mempoolidx() when the disklabel contains bsize 128KB and something reads the block device - buffer cache can't allocate bufs bigger than MAXPHYS
1.176	22-Sep-2019	christos	branches: 1.176.6; Add a new member to struct vfsstat and grow the unused members The new member is caled f_mntfromlabel and it is the dkw_wname of the corresponding wedge. This is now used by df -W to display the mountpoint name as NAME=
1.175	03-Sep-2018	riastradh	Rename min/max -> uimin/uimax for better honesty. These functions are defined on unsigned int. The generic name min/max should not silently truncate to 32 bits on 64-bit systems. This is purely a name change -- no functional change intended. HOWEVER! Some subsystems have #define min(a, b) ((a) < (b) ? (a) : (b)) #define max(a, b) ((a) > (b) ? (a) : (b)) even though our standard name for that is MIN/MAX. Although these may invite multiple evaluation bugs, these do _not_ cause integer truncation. To avoid `fixing' these cases, I first changed the name in libkern, and then compile-tested every file where min/max occurred in order to confirm that it failed -- and thus confirm that nothing shadowed min/max -- before changing it. I have left a handful of bootloaders that are too annoying to compile-test, and some dead code: cobalt ews4800mips hp300 hppa ia64 luna68k vax acorn32/if_ie.c (not included in any kernels) macppc/if_gm.c (superseded by gem(4)) It should be easy to fix the fallout once identified -- this way of doing things fails safe, and the goal here, after all, is to _avoid_ silent integer truncations, not introduce them. Maybe one day we can reintroduce min/max as type-generic things that never silently truncate. But we should avoid doing that for a while, so that existing code has a chance to be detected by the compiler for conversion to uimin/uimax without changing the semantics until we can properly audit it all. (Who knows, maybe in some cases integer truncation is actually intended!)
1.174	24-Jun-2017	hannken	branches: 1.174.4; 1.174.6; Refuse to open a block device with zero open count when it has a mountpoint set. This may happen after forced detach or unplug of a mounted block device.
1.173	01-Jun-2017	chs	branches: 1.173.2; 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.
1.172	26-May-2017	riastradh	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.
1.171	12-Apr-2017	martin	branches: 1.171.2; Make the non-DIAGNOSTIC version compile
1.170	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!
1.169	01-Mar-2017	hannken	Add a diagnostic test for buffers written to a block device holding a read-only mounted file system. This will become a KASSERT in the near future.
1.168	02-Jan-2017	hannken	branches: 1.168.2; Rename vget() to vcache_vget() and vcache_tryvget() respectively and move the definitions to sys/vnode_impl.h. No functional change intended. Welcome to 7.99.54
1.167	09-Dec-2016	nat	Add functions to access device flags. This restores simultaneous audio open/close. OK hannken@ christos@
1.166	08-Dec-2016	nat	The audio sub-system now supports the following features as posted to tech-kern: * Simultaneous playback and mixing of multiple streams * Playback streams can be of different encoding, frequency, precision and number of channels * Simultaneous recording to different formats * One audio device per process * Sysctls to set the common format frequency, precision and channels * Independent mixer controls for recording/playback per stream * Utilizes little cpu time for multiple streams / good performance * Compatible with existing programs that use OSS/NetBSD audio * Changes to audioctl(1) to allow specifying process id for corresponding audio device
1.165	08-Sep-2016	pgoyette	Revert rev 1.164. This will be redone differently (using "dummy" modules). This implementation requires changes to a base kernel in order to update the set of "special" modules, kinda defeating the purpose of having modules in the first place. The new method will use dummy modules (with name tap and tun) which will depend on the real modules with the if_ prefix. Coming soon to a NetBSD near you.
1.164	08-Sep-2016	pgoyette	if_config processing wants to auto-load modules named with an if_ prefix, while specfc wants to auto-load modules without the prefix. For modules which can be loaded both ways (ie, if_tap and if_tun), provide a simple conversion table for specfs so it can auto-load the if_ module. This table should always be quite small, and the auto-load operation is relatively infrequent, so the additional overhead of comparing names should be tolerable.
1.163	20-Aug-2016	hannken	Remove now obsolete operation vcache_remove(). Welcome to 7.99.36
1.162	04-Apr-2016	hannken	branches: 1.162.2; Avoid a race with spec_revoke for the assertion too. Final fix for PR kern/50467 Panic from disconnecting phone while reading its contents
1.161	26-Mar-2016	hannken	Whhen spec_strategy() extracts v_rdev take care to avoid a race with spec_revoke. Fixes PR kern/50467 Panic from disconnecting phone while reading its contents
1.160	05-Jan-2016	pgoyette	Fix a couple of checks for kernel vm_space, and convert the 'naked panic" code to KASSERT/KASSERTMSG. Thanks, Taylor!
1.159	23-Dec-2015	pgoyette	Revert previous
1.158	22-Dec-2015	pgoyette	If we attempt to autoload a driver module, make sure we return an error if it fails. Otherwise we might end up calling a builtin-but-disabled driver module and that can generate all sorts of issues...
1.157	08-Dec-2015	christos	Replace DIOCGPART -> DIOCGPARTINFO which returns the data needed instead of pointers.
1.156	08-Dec-2015	christos	unfortunately it is not that easy to get rid of DIOCGPART. DTRT for the raw partition and print a warning if we overflowed. I guess the right solution for this is to create yet another version of disklabel that is 64 bit friendly.
1.155	05-Dec-2015	jnemeth	messing with uninitialized structs is a bad thing
1.154	04-Dec-2015	christos	Use DIOCGMEDIASIZE instead of DIOCGPART so that we are not limited to 2G. XXX: All DIOCGPART code needs to be removed... XXX: pullup-7
1.153	01-Jul-2015	hannken	Unfortunately MFS uses v_data of its anonymous device vnode so it cannot be used as vcache key. Use v_interlock as key ...
1.152	30-Jun-2015	hannken	Redo previous again, v_specnode is invariant but not unique. Set "vp->v_data = vp" and use v_data as key.
1.151	29-Jun-2015	hannken	Use the address of vp->v_specnode as vcache key. It is invariant over the lifetime of the vnode. The previous worked by luck, it took the first sizeof(void *) bytes of struct vnode as key. Resolves CID 1308957: wrong sizeof()
1.150	29-Jun-2015	christos	Revert previous, and explain why.
1.149	29-Jun-2015	christos	CID 1308957: Fix wrong sizeof()
1.148	23-Jun-2015	hannken	Add a vfs_newvnode() method to deadfs and use it to create anonymous device vnodes with bdevvp() and cdevvp(). Implement spec_inactive() and spec_reclaim() to handle these nodes.
1.147	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.
1.146	28-Mar-2015	maxv	Remove the 'cred' argument from bread(). Remove a now unused var in ffs_snapshot.c. Update the man page accordingly. ok hannken@
1.145	25-Jul-2014	dholland	branches: 1.145.2; 1.145.4; 1.145.6; 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.
1.144	25-Jul-2014	dholland	Implement spec_fdiscard() using bdev_discard() and cdev_discard(). Also define spec_fallocate() to genfs_eopnotsupp().
1.143	24-Mar-2014	hannken	branches: 1.143.2; - Make VI_XLOCK, VI_CLEAN and VI_LOCKSHARE private to kern/vfs_*.c. - Make vwait() static. - Add vdead_check() to check a vnode for being or becoming dead. Discussed on tech-kern. Welcome to 6.99.38
1.142	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
1.141	30-Sep-2013	hannken	Replace macro v_specmountpoint with two functions spec_node_getmountedfs() and spec_node_setmountedfs() to manage the file system mounted on a device. Assert the device is a block device. Welcome to 6.99.24 Discussed on tech-kern@ some time ago. Reviewed by: David Holland <dholland@netbsd.org>
1.140	20-Jul-2013	dholland	oops, spell b_bcount properly
1.139	20-Jul-2013	dholland	In spec_strategy, if fscow_run() fails, set b_resid along with b_error to avoid panic in biodone. Noticed by riastradh.
1.138	16-Jun-2013	dholland	branches: 1.138.2; 1.138.4; Hang a warning banner on some nasty code I just found.
1.137	13-Feb-2013	hannken	Make the spec_node table implementation private to spec_vnops.c. To retrieve a spec_node, two new lookup functions (by device or by mount) are implemented. Both return a referenced vnode, for an opened block device the opened vnode is returned so further diagnostic checks "vp == ... sd_bdevvp" will not fire. Otherwise any vnode matching the criteria gets returned. No objections on tech-kern. Welcome to 6.99.17
1.136	20-Dec-2012	hannken	Change bread() and breadn() to never return a buffer on error and modify all callers to not brelse() on error. Welcome to 6.99.16 PR kern/46282 (6.0_BETA crash: msdosfs_bmap -> pcbmap -> bread -> bio_doread)
1.135	29-Apr-2012	chs	branches: 1.135.2; change vflushbuf() to take the full FSYNC_* flags. translate FSYNC_LAZY into PGO_LAZY for VOP_PUTPAGES() so that genfs_do_io() can set the appropriate io priority for the I/O. this is the first part of addressing PR 46325.
1.134	12-Jun-2011	rmind	branches: 1.134.2; 1.134.6; 1.134.8; 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.
1.133	27-Apr-2011	hannken	branches: 1.133.2; Remove no longer needed flag FSYNC_VFS /* fsync: via FSYNC_VFS() */.
1.132	26-Apr-2011	hannken	Change vflushbuf() to return an error if a synchronous write fails. Welcome to 5.99.51.
1.131	21-Aug-2010	pgoyette	branches: 1.131.2; Update the rest of the kernel to conform to the module subsystem's new locking protocol.
1.130	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.
1.129	13-Apr-2010	ahoka	Revert my last change, it's not The Right Thing [tm].
1.128	13-Apr-2010	ahoka	Autoload modules with any class. This fixes autoloading of pf, zfs and possibly others.
1.127	14-Nov-2009	elad	branches: 1.127.2; 1.127.4; - Move kauth_init() a little bit higher. - Add spec_init() to authorize special device actions (and passthru too for the time being). Move policy out of secmodel_suser.
1.126	06-Oct-2009	elad	Factor out a block of code that appears in three places (Veriexec, keylock, and securelevel) so that others can use it as well.
1.125	04-Oct-2009	tsutsui	Put workaround fix for LOCKDEBUG panic mentioned in PR kern/41078: Don't try to load a driver module if the driver is already exist but just not attached. [bc]dev_open() could return ENXIO even if the driver exists. XXX: Maybe this should be handled by helper functions for XXX: module_autoload() calls on demand.
1.124	25-Apr-2009	rmind	- Rearrange pg_delete() and pg_remove() (renamed pg_free), thus proc_enterpgrp() with proc_leavepgrp() to free process group and/or session without proc_lock held. - Rename SESSHOLD() and SESSRELE() to to proc_sesshold() and proc_sessrele(). The later releases proc_lock now. Quick OK by <ad>.
1.123	22-Feb-2009	ad	PR kern/26878 FFSv2 + softdep = livelock (no free ram) PR kern/16942 panic with softdep and quotas PR kern/19565 panic: softdep_write_inodeblock: indirect pointer #1 mismatch PR kern/26274 softdep panic: allocdirect_merge: ... PR kern/26374 Long delay before non-root users can write to softdep partitions PR kern/28621 1.6.x "vp != NULL" panic in ffs_softdep.c:4653 while unmounting a softdep (+quota) filesystem PR kern/29513 FFS+Softdep panic with unfsck-able file-corruption PR kern/31544 The ffs softdep code appears to fail to write dirty bits to disk PR kern/31981 stopping scsi disk can cause panic (softdep) PR kern/32116 kernel panic in softdep (assertion failure) PR kern/32532 softdep_trackbufs deadlock PR kern/37191 softdep: locking against myself PR kern/40474 Kernel panic after remounting raid root with softdep Retire softdep, pass 2. As discussed and later formally announced on the mailing lists.
1.122	02-Feb-2009	haad	branches: 1.122.2; Add support for loading pseudo-device drivers. Try to autoload modules from specs_open routine. If devsw_open fail, get driver name with devsw_getname routine and autoload module. For now only dm drivervcan be loaded, other pseudo drivers needs more work. Ok by ad@.
1.121	11-Jan-2009	christos	merge christos-time_t
1.120	29-Dec-2008	pooka	Rename specfs_lock as device_lock and move it from specfs to devsw. Relaxes kernel dependency on vfs.
1.119	16-May-2008	hannken	branches: 1.119.6; 1.119.10; Make sure all cached buffers with valid, not yet written data have been run through copy-on-write. Call fscow_run() with valid data where possible. The LP_UFSCOW hack is no longer needed to protect ffs_copyonwrite() against endless recursion. - Add a flag B_MODIFY to bread(), breada() and breadn(). If set the caller intends to modify the buffer returned. - Always run copy-on-write on buffers returned from ffs_balloc(). - Add new function ffs_getblk() that gets a buffer, assigns a new blkno, may clear the buffer and runs copy-on-write. Process possible errors from getblk() or fscow_run(). Part of PR kern/38664. Welcome to 4.99.63 Reviewed by: YAMAMOTO Takashi <yamt@netbsd.org>
1.118	29-Apr-2008	ad	branches: 1.118.2; 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.
1.117	28-Apr-2008	martin	Remove clause 3 and 4 from TNF licenses
1.116	24-Apr-2008	ad	branches: 1.116.2; Network protocol interrupts can now block on locks, so merge the globals proclist_mutex and proclist_lock into a single adaptive mutex (proc_lock). Implications: - Inspecting process state requires thread context, so signals can no longer be sent from a hardware interrupt handler. Signal activity must be deferred to a soft interrupt or kthread. - As the proc state locking is simplified, it's now safe to take exit() and wait() out from under kernel_lock. - The system spends less time at IPL_SCHED, and there is less lock activity.
1.115	25-Jan-2008	hannken	branches: 1.115.6; 1.115.8; Spec_open(): clear sd_bdevvp if bdev_open() failed. Ok: Andrew Doran <ad@netbsd.org>
1.114	25-Jan-2008	ad	Remove VOP_LEASE. Discussed on tech-kern.
1.113	24-Jan-2008	ad	spec_fsync: don't assert that 'vp' holds the block device open. If it's not open, there shouldn't be dirty buffers so vinvalbuf() is harmless.
1.112	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.
1.111	02-Jan-2008	ad	Merge vmlocking2 to head.
1.110	02-Dec-2007	hannken	branches: 1.110.2; 1.110.6; Fscow_run(): add a flag "bool data_valid" to note still valid data. Buffers run through copy-on-write are marked B_COWDONE. This condition is valid until the buffer has run through bwrite() and gets cleared from biodone(). Welcome to 4.99.39. Reviewed by: YAMAMOTO Takashi <yamt@netbsd.org>
1.109	26-Nov-2007	pooka	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
1.108	10-Oct-2007	ad	branches: 1.108.4; 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.
1.107	08-Oct-2007	ad	Merge brelse() changes from the vmlocking branch.
1.106	07-Oct-2007	hannken	Update the file system copy-on-write handler. - Instead of hooking the handler on the specdev of a mounted file system hook directly on the `struct mount'. - Rename from `vn_cow_' to `fscow_' and move to `kern/vfs_trans.c'. Use `mount_specific' instead of clobbering `struct mount' or `struct specinfo'. - Replace the hand-made reader/writer lock with a krwlock. - Keep `vn_cow_' functions and mark as obsolete. - Welcome to NetBSD 4.99.32 - `struct specinfo' changed size. Reviewed by: Jason Thorpe <thorpej@netbsd.org>
1.105	01-Sep-2007	pooka	branches: 1.105.2; Make bioops a pointer and point it to the softdeps struct in softdep init. Decouples "options SOFTDEP" from the main kernel and ffs code.
1.104	03-Aug-2007	pooka	branches: 1.104.2; 1.104.4; 1.104.6; ANSI-fy
1.103	29-Jul-2007	ad	It's not a good idea for device drivers to modify b_flags, as they don't need to understand the locking around that field. Instead of setting B_ERROR, set b_error instead. b_error is 'owned' by whoever completes the I/O request.
1.102	27-Jul-2007	pooka	vop_mmap parameter change
1.101	22-Jul-2007	pooka	Retire uvn_attach() - it abuses VXLOCK and its functionality, setting vnode sizes, is handled elsewhere: file system vnode creation or spec_open() for regular files or block special files, respectively. Add a call to VOP_MMAP() to the pagedvn exec path, since the vnode is being memory mapped. reviewed by tech-kern & wrstuden
1.100	09-Jul-2007	ad	branches: 1.100.2; Merge some of the less invasive changes from the vmlocking branch: - kthread, callout, devsw API changes - select()/poll() improvements - miscellaneous MT safety improvements
1.99	05-Jun-2007	yamt	improve post-ubc file overwrite performance in common cases. ie. when it's safe, actually overwrite blocks rather than doing read-modify-write. also fixes PR/33152 and PR/36303.
1.98	04-Mar-2007	christos	branches: 1.98.2; 1.98.4; Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.
1.97	26-Nov-2006	elad	branches: 1.97.4; Implement Veriexec's raw disk policy on-top of kauth(9)'s device scope, using both the rawio_spec and passthru actions to detect raw disk activity. Same for kernel memory policy. Update documentation (no longer need to expose veriexec_rawchk()) and remove all Veriexec-related bits from specfs.
1.96	04-Nov-2006	elad	Change KAUTH_SYSTEM_RAWIO to KAUTH_DEVICE_RAWIO_SPEC (moving the raw i/o requests to the device scope) and add KAUTH_DEVICE_RAWIO_PASSTHRU. Expose iskmemdev() through sys/conf.h. okay yamt@
1.95	02-Nov-2006	elad	Redo Veriexec raw disk/memory access policies so they hold only if the request is for write access.
1.94	01-Nov-2006	elad	Only use blkdev/bvp for the Veriexec case. While here, fix up IPS mode restrictions on kernel memory. okay yamt@
1.93	30-Oct-2006	elad	oops, remove debug printf slipped in. good catch from yamt@, thanks!
1.92	30-Sep-2006	jld	The poll routine needs to return POLLERR on error, not an errno. Sorry about that. Pointed out by Juergen Hannken-Illjes in mail.
1.91	21-Sep-2006	jld	Protect spec_poll from racing against revocation and thus dereferencing a NULL v_specinfo. Mostly copied (with understanding) from rev 1.83's fix to spec_ioctl, and needed for the same reason (kern/vfs_subr.c r1.231).
1.90	19-Sep-2006	elad	For the VBLK case, we always check vfs_mountedon() and it has nothing to do with the security model used. Move back the call to spec_open(), which can now return the real return value from vfs_mountedon() (EBUSY) and not EPERM, changing semantics.
1.89	08-Sep-2006	elad	branches: 1.89.2; First take at security model abstraction. - Add a few scopes to the kernel: system, network, and machdep. - Add a few more actions/sub-actions (requests), and start using them as opposed to the KAUTH_GENERIC_ISSUSER place-holders. - Introduce a basic set of listeners that implement our "traditional" security model, called "bsd44". This is the default (and only) model we have at the moment. - Update all relevant documentation. - Add some code and docs to help folks who want to actually use this stuff: * There's a sample overlay model, sitting on-top of "bsd44", for fast experimenting with tweaking just a subset of an existing model. This is pretty cool because it's really straightforward to do stuff you had to use ugly hacks for until now... * And of course, documentation describing how to do the above for quick reference, including code samples. All of these changes were tested for regressions using a Python-based testsuite that will be (I hope) available soon via pkgsrc. Information about the tests, and how to write new ones, can be found on: http://kauth.linbsd.org/kauthwiki NOTE FOR DEVELOPERS: PLEASE don't add any code that does any of the following: - Uses a KAUTH_GENERIC_ISSUSER kauth(9) request, - Checks 'securelevel' directly, - Checks a uid/gid directly. (or if you feel you have to, contact me first) This is still work in progress; It's far from being done, but now it'll be a lot easier. Relevant mailing list threads: http://mail-index.netbsd.org/tech-security/2006/01/25/0011.html http://mail-index.netbsd.org/tech-security/2006/03/24/0001.html http://mail-index.netbsd.org/tech-security/2006/04/18/0000.html http://mail-index.netbsd.org/tech-security/2006/05/15/0000.html http://mail-index.netbsd.org/tech-security/2006/08/01/0000.html http://mail-index.netbsd.org/tech-security/2006/08/25/0000.html Many thanks to YAMAMOTO Takashi, Matt Thomas, and Christos Zoulas for help stablizing kauth(9). Full credit for the regression tests, making sure these changes didn't break anything, goes to Matt Fleming and Jaime Fournier. Happy birthday Randi! :)
1.88	11-Aug-2006	christos	branches: 1.88.2; Pretending to be Elad's keyboard: fileassoc.diff adds a fileassoc_table_run() routine that allows you to pass a callback to be called with every entry on a given mount. veriexec.diff adds some raw device access policies: if raw disk is opened at strict level 1, all fingerprints on this disk will be invalidated as a safety measure. level 2 will not allow opening disk for raw writing if we monitor it, and prevent raw writes to memory. level 3 will not allow opening any disk for raw writing. both update all relevant documentation. veriexec concept is okay blymn@.
1.87	14-May-2006	elad	branches: 1.87.6; integrate kauth.
1.86	01-Mar-2006	yamt	branches: 1.86.2; 1.86.4; 1.86.6; merge yamt-uio_vmspace branch. - use vmspace rather than proc or lwp where appropriate. the latter is more natural to specify an address space. (and less likely to be abused for random purposes.) - fix a swdmover race.
1.85	11-Dec-2005	christos	branches: 1.85.2; 1.85.4; 1.85.6; merge ktrace-lwp.
1.84	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
1.83	11-Sep-2005	chs	branches: 1.83.2; in spec_ioctl(), don't dereference v_specinfo if it's NULL. this is needed due to rev. 1.231 of kern/vfs_subr.c, which now sets v_specinfo to NULL before changing the vnode's ops vector.
1.82	30-Aug-2005	xtraeme	Remove __P()
1.81	21-Jun-2005	ws	branches: 1.81.2; PR-30566: Poll must not return <sys/errno.h> values. Start with those places I can easily test.
1.80	26-Feb-2005	perry	branches: 1.80.2; nuke trailing whitespace
1.79	25-May-2004	hannken	branches: 1.79.4; 1.79.6; Add ffs internal snapshots. Written by Marshall Kirk McKusick for FreeBSD. - Not enabled by default. Needs kernel option FFS_SNAPSHOT. - Change parameters of ffs_blkfree. - Let the copy-on-write functions return an error so spec_strategy may fail if the copy-on-write fails. - Change genfs_lock() to use vp->v_vnlock instead of &vp->v_lock. - Add flag B_METAONLY to VOP_BALLOC to return indirect block buffer. - Add a function ffs_checkfreefile needed for snapshot creation. - Add special handling of snapshot files: Snapshots may not be opened for writing and the attributes are read-only. Use the mtime as the time this snapshot was taken. Deny mtime updates for snapshot files. - Add function transferlockers to transfer any waiting processes from one lock to another. - Add vfsop VFS_SNAPSHOT to take a snapshot and make it accessible through a vnode. - Add snapshot support to ls, fsck_ffs and dump. Welcome to 2.0F. Approved by: Jason R. Thorpe <thorpej@netbsd.org>
1.78	12-May-2004	jrf	caddr_t -> void * and removal of some more casts.
1.77	14-Feb-2004	hannken	branches: 1.77.2; 1.77.4; 1.77.6; Add a generic copy-on-write hook to add/remove functions that will be called with every buffer written through spec_strategy(). Used by fss(4). Future file-system-internal snapshots will need them too. Welcome to 1.6ZK Approved by: Jason R. Thorpe <thorpej@netbsd.org>
1.76	25-Jan-2004	hannken	Make VOP_STRATEGY(bp) a real VOP as discussed on tech-kern. VOP_STRATEGY(bp) is replaced by one of two new functions: - VOP_STRATEGY(vp, bp) Call the strategy routine of vp for bp. - DEV_STRATEGY(bp) Call the d_strategy routine of bp->b_dev for bp. DEV_STRATEGY(bp) is used only for block-to-block device situations.
1.75	10-Dec-2003	hannken	The file system snapshot pseudo driver. Uses a hook in spec_strategy() to save data written from a mounted file system to its block device and a hook in dounmount(). Not enabled by default in any kernel config. Approved by: Frank van der Linden <fvdl@netbsd.org>
1.74	26-Nov-2003	pk	spec_close: asserting that the terminal's process group be set if it is associated with a session is too strong; a foreground group may go away without being immediately replaced with another.
1.73	25-Nov-2003	pk	spec_close: we don't need to lock the vnode just to make a copy of its flags.
1.72	24-Nov-2003	pk	spec_close: controlling terminal hack: drop session reference count only if we actually had a reference.
1.71	06-Nov-2003	dsl	When closing a process's controlling terminal, also remove the links to the session and pgrp from the tty. The way that the console is handled means that the vrele() may not actually do the final close on the tty itself.
1.70	15-Oct-2003	dsl	Set vnode size of character disk devices to that of the partition when they are opened (was always done for block devices). This means that fstat will report the partition size and hence newfs needn't grovel into the disklabel to find the filesystem size.
1.69	07-Aug-2003	agc	Move UCB-licensed code from 4-clause to 3-clause licence. Patches provided by Joel Baker in PR 22364, verified by myself.
1.68	29-Jun-2003	fvdl	branches: 1.68.2; Back out the lwp/ktrace changes. They contained a lot of colateral damage, and need to be examined and discussed more.
1.67	28-Jun-2003	darrenr	Pass lwp pointers throughtout the kernel, as required, so that the lwpid can be inserted into ktrace records. The general change has been to replace "struct proc " with "struct lwp " in various function prototypes, pass the lwp through and use l_proc to get the process pointer when needed. Bump the kernel rev up to 1.6V
1.66	26-Oct-2002	jdolecek	now that mem_no is emitted by config(8), there is no reason to keep copy of more or less identical iskmemdev() for every arch; move the function to spec_vnop.c, and g/c machine-dependant copies
1.65	23-Oct-2002	jdolecek	merge kqueue branch into -current kqueue provides a stateful and efficient event notification framework currently supported events include socket, file, directory, fifo, pipe, tty and device changes, and monitoring of processes and signals kqueue is supported by all writable filesystems in NetBSD tree (with exception of Coda) and all device drivers supporting poll(2) based on work done by Jonathan Lemon for FreeBSD initial NetBSD port done by Luke Mewburn and Jason Thorpe
1.64	06-Sep-2002	gehenna	Merge the gehenna-devsw branch into the trunk. This merge changes the device switch tables from static array to dynamically generated by config(8). - All device switches is defined as a constant structure in device drivers. - The new grammer ``device-major'' is introduced to ``files''. device-major <prefix> char <num> [block <num>] [<rules>] - All device major numbers must be listed up in port dependent majors.<arch> by using this grammer. - Added the new naming convention. The name of the device switch must be <prefix>_[bc]devsw for auto-generation of device switch tables. - The backward compatibility of loading block/character device switch by LKM framework is broken. This is necessary to convert from block/character device major to device name in runtime and vice versa. - The restriction to assign device major by LKM is completely removed. We don't need to reserve LKM entries for dynamic loading of device switch. - In compile time, device major numbers list is packed into the kernel and the LKM framework will refer it to assign device major number dynamically.
1.63	26-Aug-2002	thorpej	Fix a signed/unsigned comparison warning from GCC 3.3.
1.62	10-Jul-2002	wiz	Spell acquire with a 'c'.
1.61	12-May-2002	matt	branches: 1.61.2; Extern speclisth
1.60	10-Nov-2001	lukem	add RCSIDs
1.59	23-Sep-2001	chs	branches: 1.59.2; change spec_{read,write}() to specify the device blkno in units of DEV_BSIZE rather than the device's sector size. this allows /dev/rcd0a and /dev/cd0a to return the same data. fixes PRs 3261 and 14026.
1.58	21-Sep-2001	chs	use shared locks instead of exclusive for VOP_READ() and VOP_READDIR().
1.57	15-Sep-2001	chs	a whole bunch of changes to improve performance and robustness under load: - remove special treatment of pager_map mappings in pmaps. this is required now, since I've removed the globals that expose the address range. pager_map now uses pmap_kenter_pa() instead of pmap_enter(), so there's no longer any need to special-case it. - eliminate struct uvm_vnode by moving its fields into struct vnode. - rewrite the pageout path. the pager is now responsible for handling the high-level requests instead of only getting control after a bunch of work has already been done on its behalf. this will allow us to UBCify LFS, which needs tighter control over its pages than other filesystems do. writing a page to disk no longer requires making it read-only, which allows us to write wired pages without causing all kinds of havoc. - use a new PG_PAGEOUT flag to indicate that a page should be freed on behalf of the pagedaemon when it's unlocked. this flag is very similar to PG_RELEASED, but unlike PG_RELEASED, PG_PAGEOUT can be cleared if the pageout fails due to eg. an indirect-block buffer being locked. this allows us to remove the "version" field from struct vm_page, and together with shrinking "loan_count" from 32 bits to 16, struct vm_page is now 4 bytes smaller. - no longer use PG_RELEASED for swap-backed pages. if the page is busy because it's being paged out, we can't release the swap slot to be reallocated until that write is complete, but unlike with vnodes we don't keep a count of in-progress writes so there's no good way to know when the write is done. instead, when we need to free a busy swap-backed page, just sleep until we can get it busy ourselves. - implement a fast-path for extending writes which allows us to avoid zeroing new pages. this substantially reduces cpu usage. - encapsulate the data used by the genfs code in a struct genfs_node, which must be the first element of the filesystem-specific vnode data for filesystems which use genfs_{get,put}pages(). - eliminate many of the UVM pagerops, since they aren't needed anymore now that the pager "put" operation is a higher-level operation. - enhance the genfs code to allow NFS to use the genfs_{get,put}pages instead of a modified copy. - clean up struct vnode by removing all the fields that used to be used by the vfs_cluster.c code (which we don't use anymore with UBC). - remove kmem_object and mb_object since they were useless. instead of allocating pages to these objects, we now just allocate pages with no object. such pages are mapped in the kernel until they are freed, so we can use the mapping to find the page to free it. this allows us to remove splvm() protection in several places. The sum of all these changes improves write throughput on my decstation 5000/200 to within 1% of the rate of NetBSD 1.5 and reduces the elapsed time for "make release" of a NetBSD 1.5 source tree on my 128MB pc to 10% less than a 1.5 kernel took.
1.56	18-Aug-2001	chs	branches: 1.56.2; undo the part of the last revision that made user block device access use the UBC interfaces. too many problems with that yet.
1.55	17-Aug-2001	chs	initialize the UVM vnode size for block devices. UBCify user access to block devices.
1.54	17-Apr-2001	thorpej	branches: 1.54.2; Don't hold vp->v_interlock when calling vcount(); vcount() calls vgone(), which may sleep.
1.53	22-Jan-2001	jdolecek	branches: 1.53.2; make filesystem vnodeop, specop, fifoop and vnodeopv_* arrays const
1.52	08-Nov-2000	chs	fix an LP64BE bogon.
1.51	27-Oct-2000	jmc	Remove usecount check in spec_open. It fails to catch VALIAS situations and vfs_mountedon will handle them all correctly.
1.50	19-Sep-2000	fvdl	Adapt for VOP_FSYNC parameter change.
1.49	22-Jul-2000	jdolecek	change the lf_advlock() arguments from int lf_advlock __P((struct lockf *, off_t, caddr_t, int, struct flock , int)); to int lf_advlock __P((struct vop_advlock_args , struct lockf *, off_t)); This matches common usage and is also compatible with similar change in FreeBSD (though they use u_quad_t as last arg).
1.48	30-Mar-2000	augustss	branches: 1.48.4; Register, begone!
1.47	08-Dec-1999	sommerfeld	Add appropriate VOP_FCNTL handlers to deadfs and specfs ops vectors.
1.46	08-Dec-1999	sommerfeld	Change to comment (only) indicating what the specfs ops vector is used for.
1.45	15-Nov-1999	fvdl	Add Kirk McKusick's soft updates code to the trunk. Not enabled by default, as the copyright on the main file (ffs_softdep.c) is such that is has been put into gnusrc. options SOFTDEP will pull this in. This code also contains the trickle syncer. Bump version number to 1.4O
1.44	16-Oct-1999	wrstuden	branches: 1.44.2; 1.44.4; In spec_close(), if we're not doing a non-blocking close and VXLOCK is not set, unlock the vnode before calling the device's close routine and relock it after it returns. tty close routines will sleep waiting for buffers to drain, which won't happen often times as the other side needs to grab the vnode lock first. Make all unmount routines lock the device vnode before calling VOP_CLOSE().
1.43	02-Oct-1998	ross	branches: 1.43.6; 1.43.12; Make spec_write() process errors and return them, otherwise we don't even notice things like hitting the end of a partition or device. (To be sure, writes to block special files are rare, but as long as we support them...)
1.42	18-Aug-1998	thorpej	Add some braces to make egcs happy (ambiguous else warning).
1.41	03-Aug-1998	kleink	Recognize _PC_SYNC_IO.
1.40	05-Jun-1998	kleink	Convert fsync vnode operator implementations and usage from the old `waitfor' argument and MNT_WAIT/MNT_NOWAIT to `flags' and FSYNC_WAIT.
1.39	01-Mar-1998	fvdl	Merge with Lite2 + local changes
1.38	16-Oct-1997	christos	Add missing cast to dev_t
1.37	09-Oct-1997	mycroft	Make various standard wmesg strings const.
1.36	02-Apr-1997	kleink	branches: 1.36.4; Remove superfluous (uio_resid == 0) check.
1.35	02-Apr-1997	kleink	added advisory record locking support
1.34	13-Oct-1996	christos	backout previous kprintf changes
1.33	10-Oct-1996	christos	printf -> kprintf, sprintf -> ksprintf
1.32	07-Sep-1996	mycroft	Implement poll(2).
1.31	05-Sep-1996	thorpej	Remove some unused variables.
1.30	01-Sep-1996	mycroft	Add a set of generic file system operations that most file systems use. Also, fix some time stamp bogosities.
1.29	22-Apr-1996	christos	remove include of <sys/cpu.h>
1.28	09-Feb-1996	christos	miscfs prototype changes
1.27	15-Oct-1995	mycroft	Implement VOP_BWRITE() using vn_bwrite(), per r_friedl@informatik.uni-kl.de.
1.26	24-Jul-1995	cgd	branches: 1.26.2; avoid unnecessary aging of buffers. This used to make sense, when buffer caches were much smaller, but makes little sense now, and will become more useless as RAM (and buffer cache) sizes grow. Suggested by Bob Baron.
1.25	08-Jul-1995	cgd	add missing splx(), as suggested by enami@sys.ptg.sony.co.jp.
1.24	02-Jul-1995	mycroft	Make spec_read() and spec_write() vaguely consistent.
1.23	10-Apr-1995	mycroft	Use the new d_type field. Set VISTTY for vnodes of tty devices.
1.22	14-Dec-1994	mycroft	Remove a_fp.
1.21	13-Dec-1994	mycroft	Turn lease_check() into a vnode op, per CSRG.
1.20	14-Nov-1994	christos	fixed struct comment; passed extra argument (struct file *) to open
1.19	29-Oct-1994	cgd	light clean; make sure headers are properly included, types are OK, etc.
1.18	20-Oct-1994	cgd	update for new syscall args description mechanism
1.17	16-Jul-1994	paulus	Support for block special files with sector sizes other than DEV_BSIZE - if the device has a disklabel with a non-zero sector size value, that value is used instead of DEV_BSIZE.
1.16	29-Jun-1994	cgd	branches: 1.16.2; New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'
1.15	08-Jun-1994	mycroft	Update to 4.4-Lite fs code, with local changes.
1.14	24-May-1994	cgd	MIN -> min, MAX -> max
1.13	21-Apr-1994	cgd	Convert mount, vnode, and buf structs to use <sys/queue.h>. Also, some knf and structure frobbing to do along with it.
1.12	27-Jan-1994	cgd	oops; fix that last...
1.11	27-Jan-1994	cgd	hack from Mike Karels to deal with the last close on a controlling terminal. from 4.4BSD.
1.10	22-Dec-1993	cgd	fix return type of vnode print routine
1.9	18-Dec-1993	mycroft	Canonicalize all #includes.
1.8	12-Nov-1993	cgd	new specfs.h and fifo.h locations
1.7	30-Oct-1993	glass	fix chris typo.
1.6	29-Oct-1993	cgd	limit block sizes requested
1.5	23-Aug-1993	cgd	branches: 1.5.2; changes from 0.9-ALPHA2 to 0.9-BETA
1.4	27-Jun-1993	andrew	branches: 1.4.2; ANSIfications - removed all implicit function return types and argument definitions. Ensured that all files include "systm.h" to gain access to general prototypes. Casts where necessary.
1.3	20-May-1993	cgd	add $Id$ strings, and clean up file headers where necessary
1.2	21-Mar-1993	cgd	after 0.2.2 "stable" patches applied
1.1	21-Mar-1993	cgd	branches: 1.1.1; Initial revision
1.1.1.4	01-Mar-1998	fvdl	Import some files that were changed after Lite2
1.1.1.3	01-Mar-1998	fvdl	Import 4.4BSD-Lite2
1.1.1.2	01-Mar-1998	fvdl	Import 4.4BSD-Lite for reference
1.1.1.1	21-Mar-1993	cgd	initial import of 386bsd-0.1 sources
1.4.2.1	20-Aug-1993	mycroft	Add a small bit of debugging code.
1.5.2.3	06-Jan-1994	pk	Re-instate EOPNOTSUPP.
1.5.2.2	28-Dec-1993	pk	Use ENODEV rather then EOPNOTSUP for unsupported operations on non-socket devices
1.5.2.1	12-Nov-1993	cgd	new specfs.h and fifo.h locations, and include file syntax updates
1.16.2.1	16-Jul-1994	cgd	update from trunk, per paulus
1.26.2.1	15-Oct-1995	mycroft	Update from main branch.
1.36.4.1	14-Oct-1997	thorpej	Update marc-pcmcia branch from trunk.
1.43.12.2	27-Dec-1999	wrstuden	Pull up to last week's -current.
1.43.12.1	21-Dec-1999	wrstuden	Initial commit of recent changes to make DEV_BSIZE go away. Runs on i386, needs work on other arch's. Main kernel routines should be fine, but a number of the stand programs need help. cd, fd, ccd, wd, and sd have been updated. sd has been tested with non-512 byte block devices. vnd, raidframe, and lfs need work. Non 2**n block support is automatic for LKM's and conditional for kernels on "options NON_PO2_BLOCKS".
1.43.6.2	27-Oct-2000	he	Pull up revision 1.51 (requested by jmc): Fix security problem in spec_open().
1.43.6.1	18-Oct-1999	cgd	pull up rev 1.44 from trunk (requested by wrstuden): In spec_close(), call the device's close routine with the vnode unlocked if the call might block. Force a non-blocking close if VXLOCK is set. This eliminates a potential deadlock situation, and should eliminate the dirty buffers on reboot issue.
1.44.4.1	19-Oct-1999	fvdl	Bring in Kirk McKusick's FFS softdep code on a branch.
1.44.2.4	21-Apr-2001	bouyer	Sync with HEAD
1.44.2.3	11-Feb-2001	bouyer	Sync with HEAD.
1.44.2.2	22-Nov-2000	bouyer	Sync with HEAD.
1.44.2.1	20-Nov-2000	bouyer	Update thorpej_scsipi to -current as of a month ago
1.48.4.4	27-Oct-2001	he	Pull up revision 1.59 (via patch, requested by chs): Change spec_{read,write}() to specify block number in units of DEV_BSIZE instead of the device's sector size. With this, /dev/rcd0a and /dev/cd0a returns the same data. Fixes PR#3261 and PR#14026.
1.48.4.3	14-Dec-2000	he	Pull up revision 1.50 (requested by fvdl): Improve NFS performance, possibly with as much as 100% in throughput. Please note: this implies a kernel interface change, VOP_FSYNC gains two arguments.
1.48.4.2	30-Oct-2000	tv	Pullup 1.51 [jmc]: Remove usecount check in spec_open. It fails to catch VALIAS situations and vfs_mountedon will handle them all correctly.
1.48.4.1	30-Jul-2000	jdolecek	Pullup from trunk (approved by thorpej): Change lf_advlock() to: int lf_advlock (struct vop_advlock_args , struct lockf *, off_t) This matches it's usage. Change inspired by FreeBSD, though we use off_t instead u_quad_t as the last argument. sys/lockf.h rev. 1.9 msdosfs/msdosfs_vnops.c rev. 1.99 kern/vfs_lockf.c rev. 1.17 miscfs/specfs/spec_vnops.c rev. 1.49 nfs/nfs_vnops.c rev. 1.115 ufs/ext2fs/ext2fs_vnops.c rev. 1.28 ufs/ufs/ufs_vnops.c rev. 1.72
1.53.2.15	11-Nov-2002	nathanw	Catch up to -current
1.53.2.14	17-Sep-2002	nathanw	Catch up to -current.
1.53.2.13	27-Aug-2002	nathanw	Catch up to -current.
1.53.2.12	01-Aug-2002	nathanw	Catch up to -current.
1.53.2.11	15-Jul-2002	nathanw	Whitespace.
1.53.2.10	12-Jul-2002	nathanw	No longer need to pull in lwp.h; proc.h pulls it in for us.
1.53.2.9	24-Jun-2002	nathanw	Curproc->curlwp renaming. Change uses of "curproc->l_proc" back to "curproc", which is more like the original use. Bare uses of "curproc" are now "curlwp". "curproc" is now #defined in proc.h as ((curlwp) ? (curlwp)->l_proc) : NULL) so that it is always safe to reference curproc (dereferencing curproc is another story, but that's always been true).
1.53.2.8	20-Jun-2002	nathanw	Catch up to -current.
1.53.2.7	14-Nov-2001	nathanw	Catch up to -current.
1.53.2.6	26-Sep-2001	nathanw	Catch up to -current. Again.
1.53.2.5	21-Sep-2001	nathanw	Catch up to -current.
1.53.2.4	24-Aug-2001	nathanw	A few files and lwp/proc conversions I missed in the last big update. GENERIC runs again.
1.53.2.3	24-Aug-2001	nathanw	Catch up with -current.
1.53.2.2	21-Jun-2001	nathanw	Catch up to -current.
1.53.2.1	05-Mar-2001	nathanw	Initial commit of scheduler activations and lightweight process support.
1.54.2.7	10-Oct-2002	jdolecek	sync kqueue with -current; this includes merge of gehenna-devsw branch, merge of i386 MP branch, and part of autoconf rototil work
1.54.2.6	26-Sep-2002	jdolecek	spec_kqfilter(): return EOPNOTSUPP for !VCHR case; block devices don't support kevents, and we don't want to attempt to support for any other files ending here neither (i.e. those which get spec vnodeops via vflush())
1.54.2.5	06-Sep-2002	jdolecek	sync kqueue branch with HEAD
1.54.2.4	23-Jun-2002	jdolecek	catch up with -current on kqueue branch
1.54.2.3	10-Jan-2002	thorpej	Sync kqueue branch with -current.
1.54.2.2	25-Aug-2001	thorpej	Merge Aug 24 -current into the kqueue branch.
1.54.2.1	10-Jul-2001	lukem	add spec_kqfilter()
1.56.2.6	01-Oct-2001	fvdl	Catch up with -current.
1.56.2.5	28-Sep-2001	fvdl	Bring locking state of VCHR vnodes across device entry points back to what they used to be. The locking state of vnodes across device functions really needs to be cleaned up, but at least this is not worse than it was before.
1.56.2.4	27-Sep-2001	fvdl	Do real locking for cloned vnodes (most filesystems have real locking for spec vnodes, so clones should have it too). Could probably do locking all the time for spec vnodes, but need to check if vnodes created during bootstrap with {b,c}devvp will cause trouble if they have actual locks.
1.56.2.3	26-Sep-2001	fvdl	* add a VCLONED vnode flag that indicates a vnode representing a cloned device. * rename REVOKEALL to REVOKEALIAS, and add a REVOKECLONE flag, to pass to VOP_REVOKE * the revoke system call will revoke all aliases, as before, but not the clones * vdevgone is called when detaching a device, so make it use REVOKECLONE to get rid of all clones as well * clean up all uses of VOP_OPEN wrt. locking. * add a few VOPS to spec_vnops that need to do something when it's a clone vnode (access and getattr) * add a copy of the vnode vattr structure of the original 'master' vnode to the specinfo of a cloned vnode. could possibly redirect getattr to the 'master' vnode, but this has issues with revoke * add a vdev_reassignvp function that disassociates a vnode from its original device, and reassociates it with the specified dev_t. to be used by cloning devices only, in case a new minor is allocated. * change all direct references in drivers to v_devcookie and v_rdev to vdev_privdata(vp) and vdev_rdev(vp). for diagnostic purposes when debugging race conditions that still exist wrt. locking and revoking vnodes. * make the locking state of a vnode consistent when passed to d_open and d_close (unlocked). locked would be better, but has some deadlock issues
1.56.2.2	18-Sep-2001	fvdl	Various changes to make cloning devices possible: * Add an extra argument (struct vnode *) to VOP_OPEN. If it is not NULL, specfs will create a cloned (aliased) vnode during the call, and return it there. The caller should release and unlock the original vnode if a new vnode was returned. The new vnode is returned locked. Add a flag field to the cdevsw and bdevsw structures. DF_CLONING indicates that it wants a new vnode for each open (XXX is there a better way? devprop?) * If a device is cloning, always call the close entry point for a VOP_CLOSE. Also, rewrite cons.c to do the right thing with vnodes. Use VOPs rather then direct device entry calls. Suggested by mycroft@ Light to moderate testing done an i386 system (arch doesn't matter though, these are MI changes).
1.56.2.1	07-Sep-2001	thorpej	Commit my "devvp" changes to the thorpej-devvp branch. This replaces the use of dev_t in most places with a struct vnode *. This will form the basic infrastructure for real cloning device support (besides being architecurally cleaner -- it'll be good to get away from using numbers to represent objects).
1.59.2.1	12-Nov-2001	thorpej	Sync the thorpej-mips-cache branch with -current.
1.61.2.3	29-Aug-2002	gehenna	catch up with -current.
1.61.2.2	15-Jul-2002	gehenna	catch up with -current.
1.61.2.1	16-May-2002	gehenna	Replace the direct-access to devsw table with calling devsw APIs.
1.68.2.6	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.68.2.5	04-Mar-2005	skrll	Sync with HEAD. Hi Perry!
1.68.2.4	21-Sep-2004	skrll	Fix the sync with head I botched.
1.68.2.3	18-Sep-2004	skrll	Sync with HEAD.
1.68.2.2	03-Aug-2004	skrll	Sync with HEAD
1.68.2.1	02-Jul-2003	darrenr	Apply the aborted ktrace-lwp changes to a specific branch. This is just for others to review, I'm concerned that patch fuziness may have resulted in some errant code being generated but I'll look at that later by comparing the diff from the base to the branch with the file I attempt to apply to it. This will, at the very least, put the changes in a better context for others to review them and attempt to tinker with removing passing of 'struct lwp' through the kernel.
1.77.6.1	29-Dec-2005	riz	Pull up following revision(s) (requested by chs in ticket #10207): sys/miscfs/specfs/spec_vnops.c: revision 1.83 in spec_ioctl(), don't dereference v_specinfo if it's NULL. this is needed due to rev. 1.231 of kern/vfs_subr.c, which now sets v_specinfo to NULL before changing the vnode's ops vector.
1.77.4.1	29-Dec-2005	riz	Pull up following revision(s) (requested by chs in ticket #10207): sys/miscfs/specfs/spec_vnops.c: revision 1.83 in spec_ioctl(), don't dereference v_specinfo if it's NULL. this is needed due to rev. 1.231 of kern/vfs_subr.c, which now sets v_specinfo to NULL before changing the vnode's ops vector.
1.77.2.1	29-Dec-2005	riz	Pull up following revision(s) (requested by chs in ticket #10207): sys/miscfs/specfs/spec_vnops.c: revision 1.83 in spec_ioctl(), don't dereference v_specinfo if it's NULL. this is needed due to rev. 1.231 of kern/vfs_subr.c, which now sets v_specinfo to NULL before changing the vnode's ops vector.
1.79.6.1	19-Mar-2005	yamt	sync with head. xen and whitespace. xen part is not finished.
1.79.4.1	29-Apr-2005	kent	sync with -current
1.80.2.2	11-Nov-2006	bouyer	Pull up following revision(s) (requested by jld in ticket #1557): sys/miscfs/specfs/spec_vnops.c: revision 1.91 via patch Protect spec_poll from racing against revocation and thus dereferencing a NULL v_specinfo. Mostly copied (with understanding) from rev 1.83's fix to spec_ioctl, and needed for the same reason (kern/vfs_subr.c r1.231).
1.80.2.1	26-Sep-2005	tron	branches: 1.80.2.1.2; 1.80.2.1.4; Pull up following revision(s) (requested by chs in ticket #812): sys/miscfs/specfs/spec_vnops.c: revision 1.83 in spec_ioctl(), don't dereference v_specinfo if it's NULL. this is needed due to rev. 1.231 of kern/vfs_subr.c, which now sets v_specinfo to NULL before changing the vnode's ops vector.
1.80.2.1.4.1	11-Nov-2006	bouyer	Pull up following revision(s) (requested by jld in ticket #1557): sys/miscfs/specfs/spec_vnops.c: revision 1.91 via patch Protect spec_poll from racing against revocation and thus dereferencing a NULL v_specinfo. Mostly copied (with understanding) from rev 1.83's fix to spec_ioctl, and needed for the same reason (kern/vfs_subr.c r1.231).
1.80.2.1.2.1	11-Nov-2006	bouyer	Pull up following revision(s) (requested by jld in ticket #1557): sys/miscfs/specfs/spec_vnops.c: revision 1.91 via patch Protect spec_poll from racing against revocation and thus dereferencing a NULL v_specinfo. Mostly copied (with understanding) from rev 1.83's fix to spec_ioctl, and needed for the same reason (kern/vfs_subr.c r1.231).
1.81.2.7	04-Feb-2008	yamt	sync with head.
1.81.2.6	21-Jan-2008	yamt	sync with head
1.81.2.5	07-Dec-2007	yamt	sync with head
1.81.2.4	27-Oct-2007	yamt	sync with head.
1.81.2.3	03-Sep-2007	yamt	sync with head.
1.81.2.2	30-Dec-2006	yamt	sync with head.
1.81.2.1	21-Jun-2006	yamt	sync with head.
1.83.2.1	20-Oct-2005	yamt	adapt specfs and fifofs.
1.85.6.2	01-Jun-2006	kardel	Sync with head.
1.85.6.1	22-Apr-2006	simonb	Sync with head.
1.85.4.1	09-Sep-2006	rpaulo	sync with head
1.85.2.1	31-Dec-2005	yamt	adapt some random parts of kernel to uio_vmspace.
1.86.6.1	24-May-2006	tron	Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
1.86.4.2	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.
1.86.4.1	08-Mar-2006	elad	Adapt to kernel authorization KPI.
1.86.2.3	14-Sep-2006	yamt	sync with head.
1.86.2.2	03-Sep-2006	yamt	sync with head.
1.86.2.1	24-May-2006	yamt	sync with head.
1.87.6.1	14-Aug-2006	tron	Pull up following revision(s) (requested by elad in ticket #15): sys/miscfs/specfs/spec_vnops.c: revision 1.88 share/man/man9/fileassoc.9: revision 1.7 sys/kern/kern_verifiedexec.c: revision 1.66 sys/sys/verified_exec.h: revision 1.39 sys/sys/fileassoc.h: revision 1.3 lib/libc/gen/sysctl.3: revision 1.178 share/man/man9/veriexec.9: revision 1.4 sys/kern/kern_fileassoc.c: revision 1.6 Pretending to be Elad's keyboard: fileassoc.diff adds a fileassoc_table_run() routine that allows you to pass a callback to be called with every entry on a given mount. veriexec.diff adds some raw device access policies: if raw disk is opened at strict level 1, all fingerprints on this disk will be invalidated as a safety measure. level 2 will not allow opening disk for raw writing if we monitor it, and prevent raw writes to memory. level 3 will not allow opening any disk for raw writing. both update all relevant documentation. veriexec concept is okay blymn@.
1.88.2.2	12-Jan-2007	ad	Sync with head.
1.88.2.1	18-Nov-2006	ad	Sync with head.
1.89.2.2	10-Dec-2006	yamt	sync with head.
1.89.2.1	22-Oct-2006	yamt	sync with head
1.97.4.1	12-Mar-2007	rmind	Sync with HEAD.
1.98.4.1	11-Jul-2007	mjf	Sync with head.
1.98.2.12	09-Oct-2007	ad	Sync with head.
1.98.2.11	09-Oct-2007	ad	Sync with head.
1.98.2.10	24-Aug-2007	ad	Remove the only (and insane) reference to B_TAPE that came long with 386BSD.
1.98.2.9	20-Aug-2007	ad	Sync with HEAD.
1.98.2.8	20-Aug-2007	ad	softdep locking improvements. It hangs looping in flush_inodedep_deps(), more work required.
1.98.2.7	19-Aug-2007	ad	- Back out the biodone() changes. - Eliminate B_ERROR (from HEAD).
1.98.2.6	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.
1.98.2.5	09-Jun-2007	ad	Sync with head.
1.98.2.4	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.
1.98.2.3	13-Apr-2007	ad	- Make the devsw interface MP safe, and add some comments. - Allow individual block/character drivers to be marked MP safe. - Provide wrappers around the device methods that look up the device, returning ENXIO if it's not found, and acquire the kernel lock if needed.
1.98.2.2	13-Apr-2007	ad	- Fix a (new) bug where vget tries to acquire freed vnodes' interlocks. - Minor locking fixes.
1.98.2.1	13-Mar-2007	ad	Pull in the initial set of changes for the vmlocking branch.
1.100.2.2	03-Sep-2007	skrll	Sync with HEAD.
1.100.2.1	15-Aug-2007	skrll	Sync with HEAD.
1.104.6.2	03-Aug-2007	pooka	ANSI-fy
1.104.6.1	03-Aug-2007	pooka	file spec_vnops.c was added on branch matt-mips64 on 2007-08-03 08:45:37 +0000
1.104.4.3	23-Mar-2008	matt	sync with HEAD
1.104.4.2	09-Jan-2008	matt	sync with HEAD
1.104.4.1	06-Nov-2007	matt	sync with HEAD
1.104.2.5	03-Dec-2007	joerg	Sync with HEAD.
1.104.2.4	27-Nov-2007	joerg	Sync with HEAD. amd64 Xen support needs testing.
1.104.2.3	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.
1.104.2.2	03-Sep-2007	jmcneill	Sync with HEAD.
1.104.2.1	03-Aug-2007	jmcneill	file spec_vnops.c was added on branch jmcneill-pm on 2007-09-03 16:48:52 +0000
1.105.2.1	14-Oct-2007	yamt	sync with head.
1.108.4.2	18-Feb-2008	mjf	Sync with HEAD.
1.108.4.1	08-Dec-2007	mjf	Sync with HEAD.
1.110.6.1	02-Jan-2008	bouyer	Sync with HEAD
1.110.2.1	04-Dec-2007	ad	Pull the vmlocking changes into a new branch.
1.115.8.1	18-May-2008	yamt	sync with head.
1.115.6.2	17-Jan-2009	mjf	Sync with HEAD.
1.115.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.116.2.5	09-Oct-2010	yamt	sync with head
1.116.2.4	11-Aug-2010	yamt	sync with head.
1.116.2.3	11-Mar-2010	yamt	sync with head
1.116.2.2	04-May-2009	yamt	sync with head.
1.116.2.1	16-May-2008	yamt	sync with head.
1.118.2.1	23-Jun-2008	wrstuden	Sync w/ -current. 34 merge conflicts to follow.
1.119.10.3	30-Dec-2008	christos	sync with head.
1.119.10.2	09-Nov-2008	christos	account for major and minor being unsigned long long
1.119.10.1	16-May-2008	christos	file spec_vnops.c was added on branch christos-time_t on 2008-11-09 02:05:20 +0000
1.119.6.3	28-Apr-2009	skrll	Sync with HEAD.
1.119.6.2	03-Mar-2009	skrll	Sync with HEAD.
1.119.6.1	19-Jan-2009	skrll	Sync with HEAD.
1.122.2.1	13-May-2009	jym	Sync with HEAD. Commit is split, to avoid a "too many arguments" protocol error.
1.127.4.4	31-May-2011	rmind	sync with head
1.127.4.3	05-Mar-2011	rmind	sync with head
1.127.4.2	03-Jul-2010	rmind	sync with head
1.127.4.1	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.
1.127.2.2	22-Oct-2010	uebayasi	Sync with HEAD (-D20101022).
1.127.2.1	17-Aug-2010	uebayasi	Sync with HEAD.
1.131.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.133.2.1	23-Jun-2011	cherry	Catchup with rmind-uvmplock merge.
1.134.8.2	10-May-2016	snj	Pull up following revision(s) (requested by hannken in ticket #1376): sys/miscfs/specfs/spec_vnops.c: revisions 1.161, 1.162 via patch Whhen spec_strategy() extracts v_rdev take care to avoid a race with spec_revoke. Fixes PR kern/50467 Panic from disconnecting phone while reading its contents -- Avoid a race with spec_revoke for the assertion too. Final fix for PR kern/50467 Panic from disconnecting phone while reading its contents
1.134.8.1	07-May-2012	riz	branches: 1.134.8.1.4; 1.134.8.1.6; Pull up following revision(s) (requested by chs in ticket #204): sys/fs/sysvbfs/sysvbfs_vnops.c: revision 1.44 sys/ufs/ffs/ffs_vfsops.c: revision 1.277 sys/fs/v7fs/v7fs_vnops.c: revision 1.11 sys/ufs/chfs/chfs_vnops.c: revision 1.7 sys/ufs/ext2fs/ext2fs_readwrite.c: revision 1.61 sys/miscfs/genfs/genfs_io.c: revision 1.54 sys/kern/vfs_wapbl.c: revision 1.52 sys/uvm/uvm_pager.h: revision 1.43 sys/ufs/ffs/ffs_vnops.c: revision 1.121 sys/kern/vfs_subr.c: revision 1.434 sys/fs/msdosfs/msdosfs_vnops.c: revision 1.83 sys/fs/ntfs/ntfs_vnops.c: revision 1.51 sys/fs/udf/udf_subr.c: revision 1.119 sys/miscfs/specfs/spec_vnops.c: revision 1.135 sys/ufs/ext2fs/ext2fs_vnops.c: revision 1.103 sys/fs/udf/udf_vnops.c: revision 1.71 sys/ufs/ufs/ufs_readwrite.c: revision 1.104 change vflushbuf() to take the full FSYNC_* flags. translate FSYNC_LAZY into PGO_LAZY for VOP_PUTPAGES() so that genfs_do_io() can set the appropriate io priority for the I/O. this is the first part of addressing PR 46325. mark all wapbl I/O as BPRIO_TIMECRITICAL. this is the second part of addressing PR 46325.
1.134.8.1.6.1	10-May-2016	snj	Pull up following revision(s) (requested by hannken in ticket #1376): sys/miscfs/specfs/spec_vnops.c: revisions 1.161, 1.162 via patch Whhen spec_strategy() extracts v_rdev take care to avoid a race with spec_revoke. Fixes PR kern/50467 Panic from disconnecting phone while reading its contents -- Avoid a race with spec_revoke for the assertion too. Final fix for PR kern/50467 Panic from disconnecting phone while reading its contents
1.134.8.1.4.1	10-May-2016	snj	Pull up following revision(s) (requested by hannken in ticket #1376): sys/miscfs/specfs/spec_vnops.c: revisions 1.161, 1.162 via patch Whhen spec_strategy() extracts v_rdev take care to avoid a race with spec_revoke. Fixes PR kern/50467 Panic from disconnecting phone while reading its contents -- Avoid a race with spec_revoke for the assertion too. Final fix for PR kern/50467 Panic from disconnecting phone while reading its contents
1.134.6.1	02-Jun-2012	mrg	sync to latest -current.
1.134.2.3	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")
1.134.2.2	23-Jan-2013	yamt	sync with head
1.134.2.1	23-May-2012	yamt	sync with head.
1.135.2.4	03-Dec-2017	jdolecek	update from HEAD
1.135.2.3	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.135.2.2	23-Jun-2013	tls	resync from head
1.135.2.1	25-Feb-2013	tls	resync with head
1.138.4.1	23-Jul-2013	riastradh	sync with HEAD
1.138.2.2	18-May-2014	rmind	sync with head
1.138.2.1	28-Aug-2013	rmind	sync with head
1.143.2.1	10-Aug-2014	tls	Rebase.
1.145.6.1	29-Apr-2016	snj	Pull up following revision(s) (requested by hannken in ticket #1154): sys/miscfs/specfs/spec_vnops.c: revision 1.161, 1.162 Whhen spec_strategy() extracts v_rdev take care to avoid a race with spec_revoke. Fixes PR kern/50467 Panic from disconnecting phone while reading its contents -- Avoid a race with spec_revoke for the assertion too. Final fix for PR kern/50467 Panic from disconnecting phone while reading its contents
1.145.4.9	28-Aug-2017	skrll	Sync with HEAD
1.145.4.8	05-Feb-2017	skrll	Sync with HEAD
1.145.4.7	05-Oct-2016	skrll	Sync with HEAD
1.145.4.6	22-Apr-2016	skrll	Sync with HEAD
1.145.4.5	19-Mar-2016	skrll	Sync with HEAD
1.145.4.4	27-Dec-2015	skrll	Sync with HEAD (as of 26th Dec)
1.145.4.3	22-Sep-2015	skrll	Sync with HEAD
1.145.4.2	06-Jun-2015	skrll	Sync with HEAD
1.145.4.1	06-Apr-2015	skrll	Sync with HEAD
1.145.2.1	29-Apr-2016	snj	Pull up following revision(s) (requested by hannken in ticket #1154): sys/miscfs/specfs/spec_vnops.c: revisions 1.161, 1.162 Whhen spec_strategy() extracts v_rdev take care to avoid a race with spec_revoke. Fixes PR kern/50467 Panic from disconnecting phone while reading its contents -- Avoid a race with spec_revoke for the assertion too. Final fix for PR kern/50467 Panic from disconnecting phone while reading its contents
1.162.2.8	26-Apr-2017	pgoyette	Sync with HEAD
1.162.2.7	20-Mar-2017	pgoyette	Sync with HEAD
1.162.2.6	07-Jan-2017	pgoyette	Sync with HEAD. (Note that most of these changes are simply $NetBSD$ tag issues.)
1.162.2.5	23-Jul-2016	pgoyette	Simplify, remove redundant code.
1.162.2.4	23-Jul-2016	pgoyette	Restore original handling of ioctl() returns. If the underlying disk's ioctl() returns success, we call uvm_vnp_setsize(). Regardless of any error from the ioctl() call we should return success.
1.162.2.3	22-Jul-2016	pgoyette	Return the actual error code, rather than blind success.
1.162.2.2	21-Jul-2016	pgoyette	fix an error patch to call {b,c}devsw_release()
1.162.2.1	20-Jul-2016	pgoyette	Adapt machine-independant code to the new {b,c}devsw reference-counting (using localcount(9)). All callers of {b,c}devsw_lookup() now call {b,c}devsw_lookup_acquire() which retains a reference on the 'struct {b,c}devsw'. This reference must be released by the caller once it is finished with the structure's content (or other data that would disappear if the 'struct {b,c}devsw' were to disappear).
1.168.2.1	21-Apr-2017	bouyer	Sync with HEAD
1.171.2.1	27-Apr-2017	pgoyette	Restore all work from the former pgoyette-localcount branch (which is now abandoned doe to cvs merge botch). The branch now builds, and installs via anita. There are still some problems (cgd is non-functional and all atf tests time-out) but they will get resolved soon.
1.173.2.1	01-Jul-2017	snj	Pull up following revision(s) (requested by hannken in ticket #76): sys/miscfs/specfs/spec_vnops.c: revision 1.174 Refuse to open a block device with zero open count when it has a mountpoint set. This may happen after forced detach or unplug of a mounted block device.
1.174.6.3	21-Apr-2020	martin	Sync with HEAD
1.174.6.2	13-Apr-2020	martin	Mostly merge changes from HEAD upto 20200411
1.174.6.1	10-Jun-2019	christos	Sync with HEAD
1.174.4.1	06-Sep-2018	pgoyette	Sync with HEAD Resolve a couple of conflicts (result of the uimin/uimax changes)
1.176.6.1	20-Apr-2020	bouyer	Sync with HEAD
1.180.2.1	03-Jan-2021	thorpej	Sync w/ HEAD.
1.181.4.1	01-Aug-2021	thorpej	Sync with HEAD.
1.218.6.1	02-Aug-2025	perseant	Sync with HEAD
1.54	22-Apr-2023	hannken	Remove unused specdev member sd_rdev. Ride 10.99.4
1.53	26-Oct-2022	riastradh	miscfs/specfs/specdev.h: New home for extern spec_vnodeop_opv_desc. Also use it for extern spec_vnodeop_p, which is already there.
1.52	28-Mar-2022	riastradh	specfs: Reorder struct specnode members to save padding. Shrinks from 40 bytes to 32 bytes on LP64 systems this way.
1.51	28-Mar-2022	riastradh	specfs: Let spec_node_lookup_by_dev wait for reclaim to finish. vdevgone relies on this to ensure that if there is a concurrent revoke in progress, it will wait for that revoke to finish -- that way, it can guarantee all I/O operations have completed and the device is closed.
1.50	28-Mar-2022	riastradh	specfs: Prevent new opens while close is waiting to drain. Otherwise, bdev/cdev_close could have cancelled all _existing_ opens, and waited for them to complete (and freed resources used by them) -- but a new one could start, and hang (e.g., a tty), at the same time spec_close tries to drain all pending I/O operations, one of which (the new open) is now hanging indefinitely. Preventing the new open from even starting until bdev/cdev_close is finished and all I/O operations have drained avoids this deadlock.
1.49	28-Mar-2022	riastradh	specfs: Drain all I/O operations after last .d_close call. New kind of I/O reference on specdevs, sd_iocnt. This could be done with psref instead; I chose a reference count instead for now because we already have to take a per-object lock anyway, v_interlock, for vdead_check, so another atomic is not likely to hurt much more. We can always change the mechanism inside spec_io_enter/exit/drain later on. Make sure every access to vp->v_rdev or vp->v_specnode and every call to a devsw operation is protected either: - by the vnode lock (with vdead_check if we unlocked/relocked), - by positive sd_opencnt, - by spec_io_enter/exit, or - by sd_opencnt management in open/close.
1.48	28-Mar-2022	riastradh	specfs: Resolve a race between close and a failing reopen.
1.47	28-Mar-2022	riastradh	specfs: Document sn_opencnt, sd_opencnt, sd_refcnt.
1.46	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.
1.45	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.
1.44	23-Jun-2015	hannken	branches: 1.44.34; Add a vfs_newvnode() method to deadfs and use it to create anonymous device vnodes with bdevvp() and cdevvp(). Implement spec_inactive() and spec_reclaim() to handle these nodes.
1.43	25-Jul-2014	dholland	branches: 1.43.4; Implement spec_fdiscard() using bdev_discard() and cdev_discard(). Also define spec_fallocate() to genfs_eopnotsupp().
1.42	30-Sep-2013	hannken	branches: 1.42.2; Replace macro v_specmountpoint with two functions spec_node_getmountedfs() and spec_node_setmountedfs() to manage the file system mounted on a device. Assert the device is a block device. Welcome to 6.99.24 Discussed on tech-kern@ some time ago. Reviewed by: David Holland <dholland@netbsd.org>
1.41	21-Apr-2013	dholland	branches: 1.41.4; add missing spec_whiteout
1.40	13-Feb-2013	hannken	Make the spec_node table implementation private to spec_vnops.c. To retrieve a spec_node, two new lookup functions (by device or by mount) are implemented. Both return a referenced vnode, for an opened block device the opened vnode is returned so further diagnostic checks "vp == ... sd_bdevvp" will not fire. Otherwise any vnode matching the criteria gets returned. No objections on tech-kern. Welcome to 6.99.17
1.39	14-Nov-2009	elad	branches: 1.39.2; 1.39.12; 1.39.22; - Move kauth_init() a little bit higher. - Add spec_init() to authorize special device actions (and passthru too for the time being). Move policy out of secmodel_suser.
1.38	06-Oct-2009	elad	Factor out a block of code that appears in three places (Veriexec, keylock, and securelevel) so that others can use it as well.
1.37	29-Dec-2008	pooka	Rename specfs_lock as device_lock and move it from specfs to devsw. Relaxes kernel dependency on vfs.
1.36	28-Apr-2008	martin	branches: 1.36.8; Remove clause 3 and 4 from TNF licenses
1.35	25-Jan-2008	ad	branches: 1.35.6; 1.35.8; 1.35.10; Remove VOP_LEASE. Discussed on tech-kern.
1.34	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.
1.33	07-Oct-2007	hannken	branches: 1.33.4; Update the file system copy-on-write handler. - Instead of hooking the handler on the specdev of a mounted file system hook directly on the `struct mount'. - Rename from `vn_cow_' to `fscow_' and move to `kern/vfs_trans.c'. Use `mount_specific' instead of clobbering `struct mount' or `struct specinfo'. - Replace the hand-made reader/writer lock with a krwlock. - Keep `vn_cow_' functions and mark as obsolete. - Welcome to NetBSD 4.99.32 - `struct specinfo' changed size. Reviewed by: Jason Thorpe <thorpej@netbsd.org>
1.32	03-Aug-2007	pooka	branches: 1.32.2; 1.32.4; 1.32.6; 1.32.8; cleanup unused prototype
1.31	22-Jul-2007	pooka	Retire uvn_attach() - it abuses VXLOCK and its functionality, setting vnode sizes, is handled elsewhere: file system vnode creation or spec_open() for regular files or block special files, respectively. Add a call to VOP_MMAP() to the pagedvn exec path, since the vnode is being memory mapped. reviewed by tech-kern & wrstuden
1.30	14-May-2006	elad	branches: 1.30.18; 1.30.28; integrate kauth.
1.29	11-Dec-2005	christos	branches: 1.29.4; 1.29.6; 1.29.8; 1.29.10; 1.29.12; merge ktrace-lwp.
1.28	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
1.27	30-Aug-2005	xtraeme	branches: 1.27.2; Remove __P()
1.26	25-May-2004	hannken	branches: 1.26.12; Add ffs internal snapshots. Written by Marshall Kirk McKusick for FreeBSD. - Not enabled by default. Needs kernel option FFS_SNAPSHOT. - Change parameters of ffs_blkfree. - Let the copy-on-write functions return an error so spec_strategy may fail if the copy-on-write fails. - Change genfs_lock() to use vp->v_vnlock instead of &vp->v_lock. - Add flag B_METAONLY to VOP_BALLOC to return indirect block buffer. - Add a function ffs_checkfreefile needed for snapshot creation. - Add special handling of snapshot files: Snapshots may not be opened for writing and the attributes are read-only. Use the mtime as the time this snapshot was taken. Deny mtime updates for snapshot files. - Add function transferlockers to transfer any waiting processes from one lock to another. - Add vfsop VFS_SNAPSHOT to take a snapshot and make it accessible through a vnode. - Add snapshot support to ls, fsck_ffs and dump. Welcome to 2.0F. Approved by: Jason R. Thorpe <thorpej@netbsd.org>
1.25	14-Feb-2004	hannken	Add a generic copy-on-write hook to add/remove functions that will be called with every buffer written through spec_strategy(). Used by fss(4). Future file-system-internal snapshots will need them too. Welcome to 1.6ZK Approved by: Jason R. Thorpe <thorpej@netbsd.org>
1.24	07-Aug-2003	agc	Move UCB-licensed code from 4-clause to 3-clause licence. Patches provided by Joel Baker in PR 22364, verified by myself.
1.23	06-Jan-2003	matt	branches: 1.23.2; Add multiple inclusion protection.
1.22	23-Oct-2002	jdolecek	merge kqueue branch into -current kqueue provides a stateful and efficient event notification framework currently supported events include socket, file, directory, fifo, pipe, tty and device changes, and monitoring of processes and signals kqueue is supported by all writable filesystems in NetBSD tree (with exception of Coda) and all device drivers supporting poll(2) based on work done by Jonathan Lemon for FreeBSD initial NetBSD port done by Luke Mewburn and Jason Thorpe
1.21	12-May-2002	matt	Extern speclisth
1.20	17-Aug-2001	chs	branches: 1.20.2; add definitions for UBCification of block devices.
1.19	08-Dec-1999	sommerfeld	branches: 1.19.6; 1.19.8; Add appropriate VOP_FCNTL handlers to deadfs and specfs ops vectors.
1.18	15-Nov-1999	fvdl	Add Kirk McKusick's soft updates code to the trunk. Not enabled by default, as the copyright on the main file (ffs_softdep.c) is such that is has been put into gnusrc. options SOFTDEP will pull this in. This code also contains the trickle syncer. Bump version number to 1.4O
1.17	01-Mar-1998	fvdl	branches: 1.17.14; 1.17.16; 1.17.20; Merge with Lite2 + local changes
1.16	11-Apr-1997	kleink	Implement a POSIX compliant genfs VOP_SEEK() and use it in the appropriate places; by Chris G. Demetriou and myself.
1.15	02-Apr-1997	kleink	added advisory record locking support
1.14	07-Sep-1996	mycroft	Implement poll(2).
1.13	01-Sep-1996	mycroft	Add a set of generic file system operations that most file systems use. Also, fix some time stamp bogosities.
1.12	13-Feb-1996	mycroft	GC *_nullop(). Minor nits.
1.11	09-Feb-1996	christos	miscfs prototype changes
1.10	15-Oct-1995	mycroft	Implement VOP_BWRITE() using vn_bwrite(), per r_friedl@informatik.uni-kl.de.
1.9	13-Dec-1994	mycroft	branches: 1.9.2; Turn lease_check() into a vnode op, per CSRG.
1.8	29-Jun-1994	cgd	New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'
1.7	08-Jun-1994	mycroft	Update to 4.4-Lite fs code, with local changes.
1.6	22-Dec-1993	cgd	fix return type of vnode print routine
1.5	07-Sep-1993	ws	Changes to VFS readdir semantics NFS changes for better cookie support ISOFS changes for better Rockridge support and support for generation numbers
1.4	27-Jun-1993	andrew	ANSIfications - lots of function prototyping.
1.3	20-May-1993	cgd	add rcs ids as necessary, and also clean up headers
1.2	19-Apr-1993	mycroft	Add consistent multiple-inclusion protection.
1.1	21-Mar-1993	cgd	branches: 1.1.1; Initial revision
1.1.1.3	01-Mar-1998	fvdl	Import 4.4BSD-Lite2
1.1.1.2	01-Mar-1998	fvdl	Import 4.4BSD-Lite for reference
1.1.1.1	21-Mar-1993	cgd	initial import of 386bsd-0.1 sources
1.9.2.1	15-Oct-1995	mycroft	Update from main branch.
1.17.20.2	27-Dec-1999	wrstuden	Pull up to last week's -current.
1.17.20.1	21-Dec-1999	wrstuden	Initial commit of recent changes to make DEV_BSIZE go away. Runs on i386, needs work on other arch's. Main kernel routines should be fine, but a number of the stand programs need help. cd, fd, ccd, wd, and sd have been updated. sd has been tested with non-512 byte block devices. vnd, raidframe, and lfs need work. Non 2**n block support is automatic for LKM's and conditional for kernels on "options NON_PO2_BLOCKS".
1.17.16.2	26-Oct-1999	fvdl	Merge changes in the trickle-sync and softdep code as done by Kirk McKusick in FreeBSD since the version that we based the branch on. Merging mostly done by Ethan Solomita <ethan@geocast.com>. Also, make sure the syncer thread/process isn't active when we're unmounting a filesystem. This could wreak havoc. XXX should be done on a per-mountpoint basis, but especially the softdep code would end up to be a big pile of vfs_busy() calls.
1.17.16.1	19-Oct-1999	fvdl	Bring in Kirk McKusick's FFS softdep code on a branch.
1.17.14.1	20-Nov-2000	bouyer	Update thorpej_scsipi to -current as of a month ago
1.19.8.3	23-Jun-2002	jdolecek	catch up with -current on kqueue branch
1.19.8.2	25-Aug-2001	thorpej	Merge Aug 24 -current into the kqueue branch.
1.19.8.1	10-Jul-2001	lukem	add spec_kqfilter()
1.19.6.4	07-Jan-2003	thorpej	Sync with HEAD.
1.19.6.3	11-Nov-2002	nathanw	Catch up to -current
1.19.6.2	20-Jun-2002	nathanw	Catch up to -current.
1.19.6.1	24-Aug-2001	nathanw	Catch up with -current.
1.20.2.5	01-Oct-2001	fvdl	Catch up with -current.
1.20.2.4	27-Sep-2001	fvdl	Do real locking for cloned vnodes (most filesystems have real locking for spec vnodes, so clones should have it too). Could probably do locking all the time for spec vnodes, but need to check if vnodes created during bootstrap with {b,c}devvp will cause trouble if they have actual locks.
1.20.2.3	26-Sep-2001	fvdl	* add a VCLONED vnode flag that indicates a vnode representing a cloned device. * rename REVOKEALL to REVOKEALIAS, and add a REVOKECLONE flag, to pass to VOP_REVOKE * the revoke system call will revoke all aliases, as before, but not the clones * vdevgone is called when detaching a device, so make it use REVOKECLONE to get rid of all clones as well * clean up all uses of VOP_OPEN wrt. locking. * add a few VOPS to spec_vnops that need to do something when it's a clone vnode (access and getattr) * add a copy of the vnode vattr structure of the original 'master' vnode to the specinfo of a cloned vnode. could possibly redirect getattr to the 'master' vnode, but this has issues with revoke * add a vdev_reassignvp function that disassociates a vnode from its original device, and reassociates it with the specified dev_t. to be used by cloning devices only, in case a new minor is allocated. * change all direct references in drivers to v_devcookie and v_rdev to vdev_privdata(vp) and vdev_rdev(vp). for diagnostic purposes when debugging race conditions that still exist wrt. locking and revoking vnodes. * make the locking state of a vnode consistent when passed to d_open and d_close (unlocked). locked would be better, but has some deadlock issues
1.20.2.2	18-Sep-2001	fvdl	Various changes to make cloning devices possible: * Add an extra argument (struct vnode *) to VOP_OPEN. If it is not NULL, specfs will create a cloned (aliased) vnode during the call, and return it there. The caller should release and unlock the original vnode if a new vnode was returned. The new vnode is returned locked. Add a flag field to the cdevsw and bdevsw structures. DF_CLONING indicates that it wants a new vnode for each open (XXX is there a better way? devprop?) * If a device is cloning, always call the close entry point for a VOP_CLOSE. Also, rewrite cons.c to do the right thing with vnodes. Use VOPs rather then direct device entry calls. Suggested by mycroft@ Light to moderate testing done an i386 system (arch doesn't matter though, these are MI changes).
1.20.2.1	07-Sep-2001	thorpej	Commit my "devvp" changes to the thorpej-devvp branch. This replaces the use of dev_t in most places with a struct vnode *. This will form the basic infrastructure for real cloning device support (besides being architecurally cleaner -- it'll be good to get away from using numbers to represent objects).
1.23.2.4	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.23.2.3	21-Sep-2004	skrll	Fix the sync with head I botched.
1.23.2.2	18-Sep-2004	skrll	Sync with HEAD.
1.23.2.1	03-Aug-2004	skrll	Sync with HEAD
1.26.12.4	04-Feb-2008	yamt	sync with head.
1.26.12.3	27-Oct-2007	yamt	sync with head.
1.26.12.2	03-Sep-2007	yamt	sync with head.
1.26.12.1	21-Jun-2006	yamt	sync with head.
1.27.2.1	20-Oct-2005	yamt	adapt specfs and fifofs.
1.29.12.1	24-May-2006	tron	Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
1.29.10.1	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.
1.29.8.1	24-May-2006	yamt	sync with head.
1.29.6.1	01-Jun-2006	kardel	Sync with head.
1.29.4.1	09-Sep-2006	rpaulo	sync with head
1.30.28.1	15-Aug-2007	skrll	Sync with HEAD.
1.30.18.3	09-Oct-2007	ad	Sync with head.
1.30.18.2	20-Aug-2007	ad	Sync with HEAD.
1.30.18.1	13-Mar-2007	ad	Pull in the initial set of changes for the vmlocking branch.
1.32.8.2	03-Aug-2007	pooka	cleanup unused prototype
1.32.8.1	03-Aug-2007	pooka	file specdev.h was added on branch matt-mips64 on 2007-08-03 08:50:24 +0000
1.32.6.1	14-Oct-2007	yamt	sync with head.
1.32.4.2	23-Mar-2008	matt	sync with HEAD
1.32.4.1	06-Nov-2007	matt	sync with HEAD
1.32.2.2	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.
1.32.2.1	03-Aug-2007	joerg	file specdev.h was added on branch jmcneill-pm on 2007-10-26 15:48:57 +0000
1.33.4.1	18-Feb-2008	mjf	Sync with HEAD.
1.35.10.3	11-Mar-2010	yamt	sync with head
1.35.10.2	04-May-2009	yamt	sync with head.
1.35.10.1	16-May-2008	yamt	sync with head.
1.35.8.1	18-May-2008	yamt	sync with head.
1.35.6.2	17-Jan-2009	mjf	Sync with HEAD.
1.35.6.1	02-Jun-2008	mjf	Sync with HEAD.
1.36.8.1	19-Jan-2009	skrll	Sync with HEAD.
1.39.22.4	03-Dec-2017	jdolecek	update from HEAD
1.39.22.3	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.39.22.2	23-Jun-2013	tls	resync from head
1.39.22.1	25-Feb-2013	tls	resync with head
1.39.12.1	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")
1.39.2.3	28-May-2010	uebayasi	specdev::v_phys_addr is now specdev::v_physseg.
1.39.2.2	28-Apr-2010	uebayasi	When mounting a block device as XIP, pass registered struct vm_physseg * as a cookie from the block device to the caller (== mount code). struct vm_physseg * will be passed to XIP vnode pager (genfs_do_getpages_xip()), then converted back to paddr_t. (My future plan is to pass struct vm_physseg * back to the fault handler, and to pmap_enter() as is.)
1.39.2.1	23-Mar-2010	uebayasi	Put run-time XIP-specific per-mount data in struct specdev, not struct mount.
1.41.4.1	18-May-2014	rmind	sync with head
1.42.2.1	10-Aug-2014	tls	Rebase.
1.43.4.1	22-Sep-2015	skrll	Sync with HEAD
1.44.34.1	01-Aug-2021	thorpej	Sync with HEAD.

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