Home | History | Annotate | Line # | Download | only in v7fs
v7fs_vfsops.c revision 1.17 
      1 /*	$NetBSD: v7fs_vfsops.c,v 1.17 2020/01/17 20:08:09 ad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004, 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: v7fs_vfsops.c,v 1.17 2020/01/17 20:08:09 ad Exp $");
     34 #if defined _KERNEL_OPT
     35 #include "opt_v7fs.h"
     36 #endif
     37 
     38 #include <sys/types.h>
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/pool.h>
     42 #include <sys/time.h>
     43 #include <sys/ucred.h>
     44 #include <sys/mount.h>
     45 #include <sys/disk.h>
     46 #include <sys/device.h>
     47 #include <sys/fcntl.h>
     48 #include <sys/kmem.h>
     49 #include <sys/kauth.h>
     50 #include <sys/proc.h>
     51 
     52 /* v-node */
     53 #include <sys/namei.h>
     54 #include <sys/vnode.h>
     55 /* devsw */
     56 #include <sys/conf.h>
     57 
     58 #include "v7fs_extern.h"
     59 #include "v7fs.h"
     60 #include "v7fs_impl.h"
     61 #include "v7fs_inode.h"
     62 #include "v7fs_superblock.h"
     63 
     64 #ifdef V7FS_VFSOPS_DEBUG
     65 #define	DPRINTF(fmt, args...)	printf("%s: " fmt, __func__, ##args)
     66 #else
     67 #define	DPRINTF(arg...)		((void)0)
     68 #endif
     69 
     70 struct pool v7fs_node_pool;
     71 
     72 static int v7fs_mountfs(struct vnode *, struct mount *, int);
     73 static int v7fs_openfs(struct vnode *, struct mount *, struct lwp *);
     74 static void v7fs_closefs(struct vnode *, struct mount *);
     75 static int is_v7fs_partition(struct vnode *);
     76 static enum vtype v7fs_mode_to_vtype(v7fs_mode_t mode);
     77 
     78 int
     79 v7fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
     80 {
     81 	struct lwp *l = curlwp;
     82 	struct v7fs_args *args = data;
     83 	struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
     84 	struct vnode *devvp = NULL;
     85 	int error = 0;
     86 	bool update = mp->mnt_flag & MNT_UPDATE;
     87 
     88 	DPRINTF("mnt_flag=%x %s\n", mp->mnt_flag, update ? "update" : "");
     89 
     90 	if (args == NULL)
     91 		return EINVAL;
     92 	if (*data_len < sizeof(*args))
     93 		return EINVAL;
     94 
     95 	if (mp->mnt_flag & MNT_GETARGS) {
     96 		if (!v7fsmount)
     97 			return EIO;
     98 		args->fspec = NULL;
     99 		args->endian = v7fsmount->core->endian;
    100 		*data_len = sizeof(*args);
    101 		return 0;
    102 	}
    103 
    104 	DPRINTF("args->fspec=%s endian=%d\n", args->fspec, args->endian);
    105 	if (args->fspec == NULL) {
    106 		/* nothing to do. */
    107 		return EINVAL;
    108 	}
    109 
    110 	if (args->fspec != NULL) {
    111 		/* Look up the name and verify that it's sane. */
    112 		error = namei_simple_user(args->fspec,
    113 		    NSM_FOLLOW_NOEMULROOT, &devvp);
    114 		if (error != 0)
    115 			return (error);
    116 		DPRINTF("mount device=%lx\n", (long)devvp->v_rdev);
    117 
    118 		if (!update) {
    119 			/*
    120 			 * Be sure this is a valid block device
    121 			 */
    122 			if (devvp->v_type != VBLK)
    123 				error = ENOTBLK;
    124 			else if (bdevsw_lookup(devvp->v_rdev) == NULL)
    125 				error = ENXIO;
    126 		} else {
    127 			KDASSERT(v7fsmount);
    128 			/*
    129 			 * Be sure we're still naming the same device
    130 			 * used for our initial mount
    131 			 */
    132 			if (devvp != v7fsmount->devvp) {
    133 				DPRINTF("devvp %p != %p rootvp=%p\n", devvp,
    134 				    v7fsmount->devvp, rootvp);
    135 				if (rootvp == v7fsmount->devvp) {
    136 					vrele(devvp);
    137 					devvp = rootvp;
    138 					vref(devvp);
    139 				} else {
    140 					error = EINVAL;
    141 				}
    142 			}
    143 		}
    144 	}
    145 
    146 	/*
    147 	 * If mount by non-root, then verify that user has necessary
    148 	 * permissions on the device.
    149 	 *
    150 	 * Permission to update a mount is checked higher, so here we presume
    151 	 * updating the mount is okay (for example, as far as securelevel goes)
    152 	 * which leaves us with the normal check.
    153 	 */
    154 	if (error == 0) {
    155 		int accessmode = VREAD;
    156 		if (update ?
    157 		    (mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
    158 		    (mp->mnt_flag & MNT_RDONLY) == 0)
    159 			accessmode |= VWRITE;
    160 		error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
    161 		    KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
    162 		    KAUTH_ARG(accessmode));
    163 	}
    164 
    165 	if (error) {
    166 		vrele(devvp);
    167 		return error;
    168 	}
    169 
    170 	if (!update) {
    171 		if ((error = v7fs_openfs(devvp, mp, l))) {
    172 			vrele(devvp);
    173 			return error;
    174 		}
    175 
    176 		if ((error = v7fs_mountfs(devvp, mp, args->endian))) {
    177 			v7fs_closefs(devvp, mp);
    178 			VOP_UNLOCK(devvp);
    179 			vrele(devvp);
    180 			return error;
    181 		}
    182 		VOP_UNLOCK(devvp);
    183 	} else 	if (mp->mnt_flag & MNT_RDONLY) {
    184 		/* XXX: r/w -> read only */
    185 	}
    186 
    187 	return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
    188 	    mp->mnt_op->vfs_name, mp, l);
    189 }
    190 
    191 static int
    192 is_v7fs_partition(struct vnode *devvp)
    193 {
    194 	struct dkwedge_info dkw;
    195 	int error;
    196 
    197 	if ((error = getdiskinfo(devvp, &dkw)) != 0) {
    198 		DPRINTF("getdiskinfo=%d\n", error);
    199 		return error;
    200 	}
    201 	DPRINTF("ptype=%s size=%" PRIu64 "\n", dkw.dkw_ptype, dkw->dkw_size);
    202 
    203 	return strcmp(dkw.dkw_ptype, DKW_PTYPE_V7) == 0 ? 0 : EINVAL;
    204 }
    205 
    206 static int
    207 v7fs_openfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
    208 {
    209 	kauth_cred_t cred = l->l_cred;
    210 	int oflags;
    211 	int error;
    212 
    213 	/* Flush buffer */
    214 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    215 	if ((error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0)))
    216 		goto unlock_exit;
    217 
    218 	/* Open block device */
    219 	oflags = FREAD;
    220 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
    221 		oflags |= FWRITE;
    222 
    223 	if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) {
    224 		DPRINTF("VOP_OPEN=%d\n", error);
    225 		goto unlock_exit;
    226 	}
    227 
    228 	return 0; /* lock held */
    229 
    230 unlock_exit:
    231 	VOP_UNLOCK(devvp);
    232 
    233 	return error;
    234 }
    235 
    236 static void
    237 v7fs_closefs(struct vnode *devvp, struct mount *mp)
    238 {
    239 	int oflags = FREAD;
    240 
    241 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
    242 		oflags |= FWRITE;
    243 
    244 	VOP_CLOSE(devvp, oflags, NOCRED);
    245 }
    246 
    247 static int
    248 v7fs_mountfs(struct vnode *devvp, struct mount *mp, int endian)
    249 {
    250 	struct v7fs_mount *v7fsmount;
    251 	int error;
    252 	struct v7fs_mount_device mount;
    253 
    254 	DPRINTF("%d\n",endian);
    255 
    256 	v7fsmount = kmem_zalloc(sizeof(*v7fsmount), KM_SLEEP);
    257 	v7fsmount->devvp = devvp;
    258 	v7fsmount->mountp = mp;
    259 
    260 	mount.device.vnode = devvp;
    261 	mount.endian = endian;
    262 
    263 	if ((error = v7fs_io_init(&v7fsmount->core, &mount, V7FS_BSIZE))) {
    264 		goto err_exit;
    265 	}
    266 	struct v7fs_self *fs = v7fsmount->core;
    267 
    268 	if ((error = v7fs_superblock_load(fs))) {
    269 		v7fs_io_fini(fs);
    270 		goto err_exit;
    271 	}
    272 
    273 	mp->mnt_data = v7fsmount;
    274 	mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev;
    275 	mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_V7FS);
    276 	mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
    277 	mp->mnt_stat.f_namemax = V7FS_NAME_MAX;
    278 	mp->mnt_flag |= MNT_LOCAL;
    279 	mp->mnt_dev_bshift = V7FS_BSHIFT;
    280 	mp->mnt_fs_bshift = V7FS_BSHIFT;
    281 
    282 	return 0;
    283 
    284 err_exit:
    285 	kmem_free(v7fsmount, sizeof(*v7fsmount));
    286 	return error;
    287 }
    288 
    289 int
    290 v7fs_start(struct mount *mp, int flags)
    291 {
    292 
    293 	DPRINTF("\n");
    294 	/* Nothing to do. */
    295 	return 0;
    296 }
    297 
    298 int
    299 v7fs_unmount(struct mount *mp, int mntflags)
    300 {
    301 	struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
    302 	int error;
    303 
    304 	DPRINTF("%p\n", v7fsmount);
    305 
    306 	if ((error = vflush(mp, NULLVP,
    307 		    mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0)
    308 		return error;
    309 
    310 	vn_lock(v7fsmount->devvp, LK_EXCLUSIVE | LK_RETRY);
    311 	error = VOP_CLOSE(v7fsmount->devvp, FREAD, NOCRED);
    312 	vput(v7fsmount->devvp);
    313 
    314 	v7fs_io_fini(v7fsmount->core);
    315 
    316 	kmem_free(v7fsmount, sizeof(*v7fsmount));
    317 	mp->mnt_data = NULL;
    318 	mp->mnt_flag &= ~MNT_LOCAL;
    319 
    320 	return 0;
    321 }
    322 
    323 int
    324 v7fs_root(struct mount *mp, int lktype, struct vnode **vpp)
    325 {
    326 	struct vnode *vp;
    327 	int error;
    328 
    329 	DPRINTF("\n");
    330 	if ((error = VFS_VGET(mp, V7FS_ROOT_INODE, lktype, &vp)) != 0) {
    331 		DPRINTF("error=%d\n", error);
    332 		return error;
    333 	}
    334 	*vpp = vp;
    335 	DPRINTF("done.\n");
    336 
    337 	return 0;
    338 }
    339 
    340 int
    341 v7fs_statvfs(struct mount *mp, struct statvfs *f)
    342 {
    343 	struct v7fs_mount *v7fsmount = mp->mnt_data;
    344 	struct v7fs_self *fs = v7fsmount->core;
    345 
    346 	DPRINTF("scratch remain=%d\n", fs->scratch_remain);
    347 
    348 	v7fs_superblock_status(fs);
    349 
    350 	f->f_bsize = V7FS_BSIZE;
    351 	f->f_frsize = V7FS_BSIZE;
    352 	f->f_iosize = V7FS_BSIZE;
    353 	f->f_blocks = fs->stat.total_blocks;
    354 	f->f_bfree = fs->stat.free_blocks;
    355 	f->f_bavail = fs->stat.free_blocks;
    356 	f->f_bresvd = 0;
    357 	f->f_files = fs->stat.total_files;
    358 	f->f_ffree = fs->stat.free_inode;
    359 	f->f_favail = f->f_ffree;
    360 	f->f_fresvd = 0;
    361 	copy_statvfs_info(f, mp);
    362 
    363 	return 0;
    364 }
    365 
    366 static bool
    367 v7fs_sync_selector(void *cl, struct vnode *vp)
    368 {
    369 	struct v7fs_node *v7fs_node;
    370 
    371 	KASSERT(mutex_owned(vp->v_interlock));
    372 
    373 	v7fs_node = vp->v_data;
    374 	if (v7fs_node == NULL)
    375 		return false;
    376 	if (!v7fs_inode_allocated(&v7fs_node->inode))
    377 		return false;
    378 
    379 	return true;
    380 }
    381 
    382 int
    383 v7fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
    384 {
    385 	struct v7fs_mount *v7fsmount = mp->mnt_data;
    386 	struct v7fs_self *fs = v7fsmount->core;
    387 	struct vnode_iterator *marker;
    388 	struct vnode *vp;
    389 	int err, error;
    390 
    391 	DPRINTF("\n");
    392 
    393 	v7fs_superblock_writeback(fs);
    394 	error = 0;
    395 	vfs_vnode_iterator_init(mp, &marker);
    396 	while ((vp = vfs_vnode_iterator_next(marker,
    397 	    v7fs_sync_selector, NULL)) != NULL) {
    398 		err = vn_lock(vp, LK_EXCLUSIVE);
    399 		if (err) {
    400 			vrele(vp);
    401 			continue;
    402 		}
    403 		err = VOP_FSYNC(vp, cred, FSYNC_WAIT, 0, 0);
    404 		vput(vp);
    405 		if (err != 0)
    406 			error = err;
    407 	}
    408 	vfs_vnode_iterator_destroy(marker);
    409 
    410 	return error;
    411 }
    412 
    413 static enum vtype
    414 v7fs_mode_to_vtype (v7fs_mode_t mode)
    415 {
    416 	enum vtype table[] = { VCHR, VDIR, VBLK, VREG, VLNK, VSOCK };
    417 
    418 	if ((mode & V7FS_IFMT) == V7FSBSD_IFFIFO)
    419 		return VFIFO;
    420 
    421 	return table[((mode >> 13) & 7) - 1];
    422 }
    423 
    424 int
    425 v7fs_loadvnode(struct mount *mp, struct vnode *vp,
    426     const void *key, size_t key_len, const void **new_key)
    427 {
    428 	struct v7fs_mount *v7fsmount;
    429 	struct v7fs_self *fs;
    430 	struct v7fs_node *v7fs_node;
    431 	struct v7fs_inode inode;
    432 	v7fs_ino_t number;
    433 	int error;
    434 
    435 	KASSERT(key_len == sizeof(number));
    436 	memcpy(&number, key, key_len);
    437 
    438 	v7fsmount = mp->mnt_data;
    439 	fs = v7fsmount->core;
    440 
    441 	/* Lookup requested i-node */
    442 	if ((error = v7fs_inode_load(fs, &inode, number))) {
    443 		DPRINTF("v7fs_inode_load failed.\n");
    444 		return error;
    445 	}
    446 
    447 	v7fs_node = pool_get(&v7fs_node_pool, PR_WAITOK);
    448 	memset(v7fs_node, 0, sizeof(*v7fs_node));
    449 
    450 	vp->v_tag = VT_V7FS;
    451 	vp->v_data = v7fs_node;
    452 	v7fs_node->vnode = vp;
    453 	v7fs_node->v7fsmount = v7fsmount;
    454 	v7fs_node->inode = inode;/*structure copy */
    455 	v7fs_node->lockf = NULL; /* advlock */
    456 
    457 	genfs_node_init(vp, &v7fs_genfsops);
    458 	uvm_vnp_setsize(vp, v7fs_inode_filesize(&inode));
    459 
    460 	if (number == V7FS_ROOT_INODE) {
    461 		vp->v_type = VDIR;
    462 		vp->v_vflag |= VV_ROOT;
    463 		vp->v_op = v7fs_vnodeop_p;
    464 	} else {
    465 		vp->v_type = v7fs_mode_to_vtype(inode.mode);
    466 
    467 		if (vp->v_type == VBLK || vp->v_type == VCHR) {
    468 			dev_t rdev = inode.device;
    469 			vp->v_op = v7fs_specop_p;
    470 			spec_node_init(vp, rdev);
    471 		} else if (vp->v_type == VFIFO) {
    472 			vp->v_op = v7fs_fifoop_p;
    473 		} else {
    474 			vp->v_op = v7fs_vnodeop_p;
    475 		}
    476 	}
    477 
    478 	*new_key = &v7fs_node->inode.inode_number;
    479 
    480 	return 0;
    481 }
    482 
    483 
    484 int
    485 v7fs_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp)
    486 {
    487 	int error;
    488 	v7fs_ino_t number;
    489 	struct vnode *vp;
    490 
    491 	KASSERT(ino <= UINT16_MAX);
    492 	number = ino;
    493 
    494 	error = vcache_get(mp, &number, sizeof(number), &vp);
    495 	if (error)
    496 		return error;
    497 	error = vn_lock(vp, lktype);
    498 	if (error) {
    499 		vrele(vp);
    500 		return error;
    501 	}
    502 
    503 	*vpp = vp;
    504 
    505 	return 0;
    506 }
    507 
    508 int
    509 v7fs_fhtovp(struct mount *mp, struct fid *fid, int lktype, struct vnode **vpp)
    510 {
    511 
    512 	DPRINTF("\n");
    513 	/* notyet */
    514 	return EOPNOTSUPP;
    515 }
    516 
    517 int
    518 v7fs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size)
    519 {
    520 
    521 	DPRINTF("\n");
    522 	/* notyet */
    523 	return EOPNOTSUPP;
    524 }
    525 
    526 void
    527 v7fs_init(void)
    528 {
    529 
    530 	DPRINTF("\n");
    531 	pool_init(&v7fs_node_pool, sizeof(struct v7fs_node), 0, 0, 0,
    532 	    "v7fs_node_pool", &pool_allocator_nointr, IPL_NONE);
    533 }
    534 
    535 void
    536 v7fs_reinit(void)
    537 {
    538 
    539 	/* Nothing to do. */
    540 	DPRINTF("\n");
    541 }
    542 
    543 void
    544 v7fs_done(void)
    545 {
    546 
    547 	DPRINTF("\n");
    548 	pool_destroy(&v7fs_node_pool);
    549 }
    550 
    551 int
    552 v7fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
    553     kauth_cred_t cred)
    554 {
    555 
    556 	DPRINTF("\n");
    557 	return 0;
    558 }
    559 
    560 int
    561 v7fs_mountroot(void)
    562 {
    563 	struct mount *mp;
    564 	int error;
    565 
    566 	DPRINTF("");
    567 	/* On mountroot, devvp (rootdev) is opened by vfs_mountroot */
    568 	if ((error = is_v7fs_partition (rootvp)))
    569 		return error;
    570 
    571 	if ((error = vfs_rootmountalloc(MOUNT_V7FS, "root_device", &mp))) {
    572 		DPRINTF("mountalloc error=%d\n", error);
    573 		vrele(rootvp);
    574 		return error;
    575 	}
    576 
    577 	if ((error = v7fs_mountfs(rootvp, mp, _BYTE_ORDER))) {
    578 		DPRINTF("mountfs error=%d\n", error);
    579 		vfs_unbusy(mp);
    580 		vfs_rele(mp);
    581 		return error;
    582 	}
    583 
    584 	mountlist_append(mp);
    585 
    586 	vfs_unbusy(mp);
    587 
    588 	return 0;
    589 }
    590