2 * modified for EXT2FS support in Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
8 * Copyright (c) 1989, 1991, 1993, 1994
9 * The Regents of the University of California. All rights reserved.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
40 * COPYRIGHT.INFO says this has some GPL'd code from ext2_super.c in it
42 * This program is free software; you can redistribute it and/or modify
43 * it under the terms of the GNU General Public License as published by
44 * the Free Software Foundation; either version 2 of the License.
46 * This program is distributed in the hope that it will be useful,
47 * but WITHOUT ANY WARRANTY; without even the implied warranty of
48 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
49 * GNU General Public License for more details.
51 * You should have received a copy of the GNU General Public License
52 * along with this program; if not, write to the Free Software
53 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
57 #include <sys/param.h>
58 #include <sys/systm.h>
59 #include <sys/namei.h>
62 #include <sys/kernel.h>
63 #include <sys/vnode.h>
64 #include <sys/mount.h>
68 #include <sys/fcntl.h>
69 #include <sys/malloc.h>
71 #include <sys/mutex.h>
73 #include <geom/geom.h>
74 #include <geom/geom_vfs.h>
76 #include <gnu/fs/ext2fs/ext2_mount.h>
77 #include <gnu/fs/ext2fs/inode.h>
79 #include <gnu/fs/ext2fs/fs.h>
80 #include <gnu/fs/ext2fs/ext2_extern.h>
81 #include <gnu/fs/ext2fs/ext2_fs.h>
82 #include <gnu/fs/ext2fs/ext2_fs_sb.h>
84 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
85 static int ext2_mountfs(struct vnode *, struct mount *, struct thread *);
86 static int ext2_reload(struct mount *mp, struct thread *td);
87 static int ext2_sbupdate(struct ext2mount *, int);
89 static vfs_unmount_t ext2_unmount;
90 static vfs_root_t ext2_root;
91 static vfs_statfs_t ext2_statfs;
92 static vfs_sync_t ext2_sync;
93 static vfs_vget_t ext2_vget;
94 static vfs_fhtovp_t ext2_fhtovp;
95 static vfs_mount_t ext2_mount;
97 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
98 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
100 static struct vfsops ext2fs_vfsops = {
101 .vfs_fhtovp = ext2_fhtovp,
102 .vfs_mount = ext2_mount,
103 .vfs_root = ext2_root, /* root inode via vget */
104 .vfs_statfs = ext2_statfs,
105 .vfs_sync = ext2_sync,
106 .vfs_unmount = ext2_unmount,
107 .vfs_vget = ext2_vget,
110 VFS_SET(ext2fs_vfsops, ext2fs, 0);
112 #define bsd_malloc malloc
113 #define bsd_free free
115 static int ext2_check_sb_compat(struct ext2_super_block *es, struct cdev *dev,
117 static int compute_sb_data(struct vnode * devvp,
118 struct ext2_super_block * es, struct ext2_sb_info * fs);
120 static const char *ext2_opts[] = { "from", "export", "acls", "noexec",
121 "noatime", "union", "suiddir", "multilabel", "nosymfollow",
122 "noclusterr", "noclusterw", "force", NULL };
134 struct vfsoptlist *opts;
136 struct ext2mount *ump = 0;
137 struct ext2_sb_info *fs;
139 int error, flags, len;
141 struct nameidata nd, *ndp = &nd;
143 opts = mp->mnt_optnew;
145 if (vfs_filteropt(opts, ext2_opts))
148 vfs_getopt(opts, "fspath", (void **)&path, NULL);
149 /* Double-check the length of path.. */
150 if (strlen(path) >= MAXMNTLEN - 1)
151 return (ENAMETOOLONG);
154 error = vfs_getopt(opts, "from", (void **)&fspec, &len);
155 if (!error && fspec[len - 1] != '\0')
159 * If updating, check whether changing from read-only to
160 * read/write; if there is no device name, that's all we do.
162 if (mp->mnt_flag & MNT_UPDATE) {
166 if (fs->s_rd_only == 0 &&
167 vfs_flagopt(opts, "ro", NULL, 0)) {
168 error = VFS_SYNC(mp, MNT_WAIT, td);
172 if (mp->mnt_flag & MNT_FORCE)
174 if (vfs_busy(mp, LK_NOWAIT, 0, td))
176 error = ext2_flushfiles(mp, flags, td);
178 if (!error && fs->s_wasvalid) {
179 fs->s_es->s_state |= EXT2_VALID_FS;
180 ext2_sbupdate(ump, MNT_WAIT);
183 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
186 g_access(ump->um_cp, 0, -1, 0);
190 if (!error && (mp->mnt_flag & MNT_RELOAD))
191 error = ext2_reload(mp, td);
194 devvp = ump->um_devvp;
195 if (fs->s_rd_only && !vfs_flagopt(opts, "ro", NULL, 0)) {
196 if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev, 0))
199 * If upgrade to read-write by non-root, then verify
200 * that user has necessary permissions on the device.
202 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
203 error = VOP_ACCESS(devvp, VREAD | VWRITE,
206 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
208 VOP_UNLOCK(devvp, 0, td);
211 VOP_UNLOCK(devvp, 0, td);
214 error = g_access(ump->um_cp, 0, 1, 0);
220 if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 ||
221 (fs->s_es->s_state & EXT2_ERROR_FS)) {
222 if (mp->mnt_flag & MNT_FORCE) {
224 "WARNING: %s was not properly dismounted\n",
228 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
233 fs->s_es->s_state &= ~EXT2_VALID_FS;
234 ext2_sbupdate(ump, MNT_WAIT);
237 mp->mnt_flag &= ~MNT_RDONLY;
240 if (vfs_flagopt(opts, "export", NULL, 0)) {
241 /* Process export requests in vfs_mount.c. */
246 * Not an update, or updating the name: look up the name
247 * and verify that it refers to a sensible disk device.
251 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
252 if ((error = namei(ndp)) != 0)
254 NDFREE(ndp, NDF_ONLY_PNBUF);
257 if (!vn_isdisk(devvp, &error)) {
263 * If mount by non-root, then verify that user has necessary
264 * permissions on the device.
266 * XXXRW: VOP_ACCESS() enough?
269 if ((mp->mnt_flag & MNT_RDONLY) == 0)
270 accessmode |= VWRITE;
271 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td);
273 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
279 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
280 error = ext2_mountfs(devvp, mp, td);
282 if (devvp != ump->um_devvp) {
284 return (EINVAL); /* needs translation */
295 * Note that this strncpy() is ok because of a check at the start
298 strncpy(fs->fs_fsmnt, path, MAXMNTLEN);
299 fs->fs_fsmnt[MAXMNTLEN - 1] = '\0';
300 vfs_mountedfrom(mp, fspec);
305 * checks that the data in the descriptor blocks make sense
306 * this is taken from ext2/super.c
308 static int ext2_check_descriptors (struct ext2_sb_info * sb)
312 unsigned long block = sb->s_es->s_first_data_block;
313 struct ext2_group_desc * gdp = NULL;
315 /* ext2_debug ("Checking group descriptors"); */
317 for (i = 0; i < sb->s_groups_count; i++)
319 /* examine next descriptor block */
320 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
321 gdp = (struct ext2_group_desc *)
322 sb->s_group_desc[desc_block++]->b_data;
323 if (gdp->bg_block_bitmap < block ||
324 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
326 printf ("ext2_check_descriptors: "
327 "Block bitmap for group %d"
328 " not in group (block %lu)!\n",
329 i, (unsigned long) gdp->bg_block_bitmap);
332 if (gdp->bg_inode_bitmap < block ||
333 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
335 printf ("ext2_check_descriptors: "
336 "Inode bitmap for group %d"
337 " not in group (block %lu)!\n",
338 i, (unsigned long) gdp->bg_inode_bitmap);
341 if (gdp->bg_inode_table < block ||
342 gdp->bg_inode_table + sb->s_itb_per_group >=
343 block + EXT2_BLOCKS_PER_GROUP(sb))
345 printf ("ext2_check_descriptors: "
346 "Inode table for group %d"
347 " not in group (block %lu)!\n",
348 i, (unsigned long) gdp->bg_inode_table);
351 block += EXT2_BLOCKS_PER_GROUP(sb);
358 ext2_check_sb_compat(es, dev, ronly)
359 struct ext2_super_block *es;
364 if (es->s_magic != EXT2_SUPER_MAGIC) {
365 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
366 devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC);
369 if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
370 if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
372 "WARNING: mount of %s denied due to unsupported optional features\n",
377 (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
379 "WARNING: R/W mount of %s denied due to unsupported optional features\n",
388 * this computes the fields of the ext2_sb_info structure from the
389 * data in the ext2_super_block structure read in
391 static int compute_sb_data(devvp, es, fs)
392 struct vnode * devvp;
393 struct ext2_super_block * es;
394 struct ext2_sb_info * fs;
398 int logic_sb_block = 1; /* XXX for now */
403 #define V(v) printf(#v"= %d\n", fs->v);
406 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
408 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
410 fs->s_fsbtodb = es->s_log_block_size + 1;
412 fs->s_qbmask = fs->s_blocksize - 1;
414 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
416 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
419 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
421 fs->s_blocks_per_group = es->s_blocks_per_group;
422 V(s_blocks_per_group)
423 fs->s_frags_per_group = es->s_frags_per_group;
425 fs->s_inodes_per_group = es->s_inodes_per_group;
426 V(s_inodes_per_group)
427 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
428 V(s_inodes_per_block)
429 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
431 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
433 /* s_resuid / s_resgid ? */
434 fs->s_groups_count = (es->s_blocks_count -
435 es->s_first_data_block +
436 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
437 EXT2_BLOCKS_PER_GROUP(fs);
439 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
440 EXT2_DESC_PER_BLOCK(fs);
441 fs->s_db_per_group = db_count;
444 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
445 M_EXT2MNT, M_WAITOK);
447 /* adjust logic_sb_block */
448 if(fs->s_blocksize > SBSIZE)
449 /* Godmar thinks: if the blocksize is greater than 1024, then
450 the superblock is logically part of block zero.
454 for (i = 0; i < db_count; i++) {
455 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
456 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]);
458 for (j = 0; j < i; j++)
459 brelse(fs->s_group_desc[j]);
460 bsd_free(fs->s_group_desc, M_EXT2MNT);
461 printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
464 LCK_BUF(fs->s_group_desc[i])
466 if(!ext2_check_descriptors(fs)) {
467 for (j = 0; j < db_count; j++)
468 ULCK_BUF(fs->s_group_desc[j])
469 bsd_free(fs->s_group_desc, M_EXT2MNT);
470 printf("EXT2-fs: (ext2_check_descriptors failure) "
471 "unable to read group descriptors\n");
475 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
476 fs->s_inode_bitmap_number[i] = 0;
477 fs->s_inode_bitmap[i] = NULL;
478 fs->s_block_bitmap_number[i] = 0;
479 fs->s_block_bitmap[i] = NULL;
481 fs->s_loaded_inode_bitmaps = 0;
482 fs->s_loaded_block_bitmaps = 0;
483 if (es->s_rev_level == EXT2_GOOD_OLD_REV || (es->s_feature_ro_compat &
484 EXT2_FEATURE_RO_COMPAT_LARGE_FILE) == 0)
485 fs->fs_maxfilesize = 0x7fffffff;
487 fs->fs_maxfilesize = 0x7fffffffffffffff;
492 * Reload all incore data for a filesystem (used after running fsck on
493 * the root filesystem and finding things to fix). The filesystem must
494 * be mounted read-only.
496 * Things to do to update the mount:
497 * 1) invalidate all cached meta-data.
498 * 2) re-read superblock from disk.
499 * 3) re-read summary information from disk.
500 * 4) invalidate all inactive vnodes.
501 * 5) invalidate all cached file data.
502 * 6) re-read inode data for all active vnodes.
505 ext2_reload(struct mount *mp, struct thread *td)
507 struct vnode *vp, *mvp, *devvp;
510 struct ext2_super_block * es;
511 struct ext2_sb_info *fs;
514 if ((mp->mnt_flag & MNT_RDONLY) == 0)
517 * Step 1: invalidate all cached meta-data.
519 devvp = VFSTOEXT2(mp)->um_devvp;
520 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
521 if (vinvalbuf(devvp, 0, td, 0, 0) != 0)
522 panic("ext2_reload: dirty1");
523 VOP_UNLOCK(devvp, 0, td);
526 * Step 2: re-read superblock from disk.
527 * constants have been adjusted for ext2
529 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
531 es = (struct ext2_super_block *)bp->b_data;
532 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
534 return (EIO); /* XXX needs translation */
536 fs = VFSTOEXT2(mp)->um_e2fs;
537 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
539 if((error = compute_sb_data(devvp, es, fs)) != 0) {
544 if (fs->fs_sbsize < SBSIZE)
545 bp->b_flags |= B_INVAL;
551 MNT_VNODE_FOREACH(vp, mp, mvp) {
553 if (vp->v_iflag & VI_DOOMED) {
559 * Step 4: invalidate all cached file data.
561 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
562 MNT_VNODE_FOREACH_ABORT(mp, mvp);
565 if (vinvalbuf(vp, 0, td, 0, 0))
566 panic("ext2_reload: dirty2");
568 * Step 5: re-read inode data for all active vnodes.
572 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
573 (int)fs->s_blocksize, NOCRED, &bp);
575 VOP_UNLOCK(vp, 0, td);
577 MNT_VNODE_FOREACH_ABORT(mp, mvp);
580 ext2_ei2i((struct ext2_inode *) ((char *)bp->b_data +
581 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)), ip);
583 VOP_UNLOCK(vp, 0, td);
592 * Common code for mount and mountroot
595 ext2_mountfs(devvp, mp, td)
600 struct ext2mount *ump;
602 struct ext2_sb_info *fs;
603 struct ext2_super_block * es;
604 struct cdev *dev = devvp->v_rdev;
605 struct g_consumer *cp;
610 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
611 /* XXX: use VOP_ACESS to check FS perms */
614 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
617 VOP_UNLOCK(devvp, 0, td);
621 /* XXX: should we check for some sectorsize or 512 instead? */
622 if (((SBSIZE % cp->provider->sectorsize) != 0) ||
623 (SBSIZE < cp->provider->sectorsize)) {
632 bo = &devvp->v_bufobj;
634 bo->bo_ops = g_vfs_bufops;
635 if (devvp->v_rdev->si_iosize_max != 0)
636 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
637 if (mp->mnt_iosize_max > MAXPHYS)
638 mp->mnt_iosize_max = MAXPHYS;
642 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
644 es = (struct ext2_super_block *)bp->b_data;
645 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
646 error = EINVAL; /* XXX needs translation */
649 if ((es->s_state & EXT2_VALID_FS) == 0 ||
650 (es->s_state & EXT2_ERROR_FS)) {
651 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
653 "WARNING: Filesystem was not properly dismounted\n");
656 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
661 ump = bsd_malloc(sizeof *ump, M_EXT2MNT, M_WAITOK);
662 bzero((caddr_t)ump, sizeof *ump);
663 /* I don't know whether this is the right strategy. Note that
664 we dynamically allocate both an ext2_sb_info and an ext2_super_block
665 while Linux keeps the super block in a locked buffer
667 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
668 M_EXT2MNT, M_WAITOK);
669 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
670 M_EXT2MNT, M_WAITOK);
671 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
672 if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)))
675 * We don't free the group descriptors allocated by compute_sb_data()
676 * until ext2_unmount(). This is OK since the mount will succeed.
681 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
682 /* if the fs is not mounted read-only, make sure the super block is
683 always written back on a sync()
685 fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0;
687 fs->s_dirt = 1; /* mark it modified */
688 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
690 mp->mnt_data = (qaddr_t)ump;
691 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
692 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
693 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
695 mp->mnt_flag |= MNT_LOCAL;
699 ump->um_devvp = devvp;
700 ump->um_bo = &devvp->v_bufobj;
702 /* setting those two parameters allowed us to use
703 ufs_bmap w/o changse !
705 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
706 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
707 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
709 ext2_sbupdate(ump, MNT_WAIT);
722 bsd_free(ump->um_e2fs->s_es, M_EXT2MNT);
723 bsd_free(ump->um_e2fs, M_EXT2MNT);
724 bsd_free(ump, M_EXT2MNT);
725 mp->mnt_data = (qaddr_t)0;
731 * unmount system call
734 ext2_unmount(mp, mntflags, td)
739 struct ext2mount *ump;
740 struct ext2_sb_info *fs;
741 int error, flags, ronly, i;
744 if (mntflags & MNT_FORCE) {
745 if (mp->mnt_flag & MNT_ROOTFS)
749 if ((error = ext2_flushfiles(mp, flags, td)) != 0)
753 ronly = fs->s_rd_only;
756 fs->s_es->s_state |= EXT2_VALID_FS;
757 ext2_sbupdate(ump, MNT_WAIT);
760 /* release buffers containing group descriptors */
761 for(i = 0; i < fs->s_db_per_group; i++)
762 ULCK_BUF(fs->s_group_desc[i])
763 bsd_free(fs->s_group_desc, M_EXT2MNT);
765 /* release cached inode/block bitmaps */
766 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
767 if (fs->s_inode_bitmap[i])
768 ULCK_BUF(fs->s_inode_bitmap[i])
770 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
771 if (fs->s_block_bitmap[i])
772 ULCK_BUF(fs->s_block_bitmap[i])
776 g_vfs_close(ump->um_cp, td);
779 vrele(ump->um_devvp);
780 bsd_free(fs->s_es, M_EXT2MNT);
781 bsd_free(fs, M_EXT2MNT);
782 bsd_free(ump, M_EXT2MNT);
783 mp->mnt_data = (qaddr_t)0;
785 mp->mnt_flag &= ~MNT_LOCAL;
791 * Flush out all the files in a filesystem.
794 ext2_flushfiles(mp, flags, td)
801 error = vflush(mp, 0, flags, td);
806 * Get file system statistics.
807 * taken from ext2/super.c ext2_statfs
810 ext2_statfs(mp, sbp, td)
815 unsigned long overhead;
816 struct ext2mount *ump;
817 struct ext2_sb_info *fs;
818 struct ext2_super_block *es;
825 if (es->s_magic != EXT2_SUPER_MAGIC)
826 panic("ext2_statfs - magic number spoiled");
829 * Compute the overhead (FS structures)
831 if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) {
833 for (i = 0 ; i < fs->s_groups_count; i++)
834 if (ext2_group_sparse(i))
837 nsb = fs->s_groups_count;
838 overhead = es->s_first_data_block +
839 /* Superblocks and block group descriptors: */
840 nsb * (1 + fs->s_db_per_group) +
841 /* Inode bitmap, block bitmap, and inode table: */
842 fs->s_groups_count * (1 + 1 + fs->s_itb_per_group);
844 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
845 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
846 sbp->f_blocks = es->s_blocks_count - overhead;
847 sbp->f_bfree = es->s_free_blocks_count;
848 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
849 sbp->f_files = es->s_inodes_count;
850 sbp->f_ffree = es->s_free_inodes_count;
855 * Go through the disk queues to initiate sandbagged IO;
856 * go through the inodes to write those that have been modified;
857 * initiate the writing of the super block if it has been modified.
859 * Note: we are always called with the filesystem marked `MPBUSY'.
862 ext2_sync(mp, waitfor, td)
867 struct vnode *mvp, *vp;
869 struct ext2mount *ump = VFSTOEXT2(mp);
870 struct ext2_sb_info *fs;
871 int error, allerror = 0;
874 if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */
875 printf("fs = %s\n", fs->fs_fsmnt);
876 panic("ext2_sync: rofs mod");
879 * Write back each (modified) inode.
883 MNT_VNODE_FOREACH(vp, mp, mvp) {
885 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) {
892 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
893 (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
894 waitfor == MNT_LAZY)) {
899 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
902 if (error == ENOENT) {
903 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
908 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
910 VOP_UNLOCK(vp, 0, td);
916 * Force stale file system control information to be flushed.
918 if (waitfor != MNT_LAZY) {
919 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
920 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
922 VOP_UNLOCK(ump->um_devvp, 0, td);
925 * Write back modified superblock.
927 if (fs->s_dirt != 0) {
929 fs->s_es->s_wtime = time_second;
930 if ((error = ext2_sbupdate(ump, waitfor)) != 0)
937 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
938 * in from disk. If it is in core, wait for the lock bit to clear, then
939 * return the inode locked. Detection and handling of mount points must be
940 * done by the calling routine.
943 ext2_vget(mp, ino, flags, vpp)
949 struct ext2_sb_info *fs;
951 struct ext2mount *ump;
960 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
961 if (error || *vpp != NULL)
968 * If this MALLOC() is performed after the getnewvnode()
969 * it might block, leaving a vnode with a NULL v_data to be
970 * found by ext2_sync() if a sync happens to fire right then,
971 * which will cause a panic because ext2_sync() blindly
972 * dereferences vp->v_data (as well it should).
974 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
976 /* Allocate a new vnode/inode. */
977 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
979 free(ip, M_EXT2NODE);
984 ip->i_e2fs = fs = ump->um_e2fs;
987 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL, td);
988 error = insmntque(vp, mp);
990 free(ip, M_EXT2NODE);
994 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
995 if (error || *vpp != NULL)
998 /* Read in the disk contents for the inode, copy into the inode. */
1000 printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
1002 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
1003 (int)fs->s_blocksize, NOCRED, &bp)) != 0) {
1005 * The inode does not contain anything useful, so it would
1006 * be misleading to leave it on its hash chain. With mode
1007 * still zero, it will be unlinked and returned to the free
1015 /* convert ext2 inode to dinode */
1016 ext2_ei2i((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
1017 ino_to_fsbo(fs, ino)), ip);
1018 ip->i_block_group = ino_to_cg(fs, ino);
1019 ip->i_next_alloc_block = 0;
1020 ip->i_next_alloc_goal = 0;
1021 ip->i_prealloc_count = 0;
1022 ip->i_prealloc_block = 0;
1023 /* now we want to make sure that block pointers for unused
1024 blocks are zeroed out - ext2_balloc depends on this
1025 although for regular files and directories only
1027 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
1028 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
1029 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1033 ext2_print_inode(ip);
1038 * Initialize the vnode from the inode, check for aliases.
1039 * Note that the underlying vnode may have changed.
1041 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
1047 * Finish inode initialization now that aliasing has been resolved.
1049 ip->i_devvp = ump->um_devvp;
1051 * Set up a generation number for this inode if it does not
1052 * already have one. This should only happen on old filesystems.
1054 if (ip->i_gen == 0) {
1055 ip->i_gen = random() / 2 + 1;
1056 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1057 ip->i_flag |= IN_MODIFIED;
1064 * File handle to vnode
1066 * Have to be really careful about stale file handles:
1067 * - check that the inode number is valid
1068 * - call ext2_vget() to get the locked inode
1069 * - check for an unallocated inode (i_mode == 0)
1070 * - check that the given client host has export rights and return
1071 * those rights via. exflagsp and credanonp
1074 ext2_fhtovp(mp, fhp, vpp)
1082 struct ext2_sb_info *fs;
1085 ufhp = (struct ufid *)fhp;
1086 fs = VFSTOEXT2(mp)->um_e2fs;
1087 if (ufhp->ufid_ino < ROOTINO ||
1088 ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group)
1091 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
1097 if (ip->i_mode == 0 ||
1098 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
1104 vnode_create_vobject(*vpp, 0, curthread);
1109 * Write a superblock and associated information back to disk.
1112 ext2_sbupdate(mp, waitfor)
1113 struct ext2mount *mp;
1116 struct ext2_sb_info *fs = mp->um_e2fs;
1117 struct ext2_super_block *es = fs->s_es;
1121 printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1123 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
1124 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1125 if (waitfor == MNT_WAIT)
1131 * The buffers for group descriptors, inode bitmaps and block bitmaps
1132 * are not busy at this point and are (hopefully) written by the
1133 * usual sync mechanism. No need to write them here
1140 * Return the root of a filesystem.
1143 ext2_root(mp, flags, vpp, td)
1152 error = VFS_VGET(mp, (ino_t)ROOTINO, LK_EXCLUSIVE, &nvp);