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
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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
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29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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35 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/namei.h>
44 #include <sys/kernel.h>
45 #include <sys/vnode.h>
46 #include <sys/mount.h>
50 #include <sys/fcntl.h>
51 #include <sys/malloc.h>
53 #include <sys/mutex.h>
55 #include <geom/geom.h>
56 #include <geom/geom_vfs.h>
58 #include <fs/ext2fs/ext2_mount.h>
59 #include <fs/ext2fs/inode.h>
61 #include <fs/ext2fs/fs.h>
62 #include <fs/ext2fs/ext2fs.h>
63 #include <fs/ext2fs/ext2_dinode.h>
64 #include <fs/ext2fs/ext2_extern.h>
66 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
67 static int ext2_mountfs(struct vnode *, struct mount *);
68 static int ext2_reload(struct mount *mp, struct thread *td);
69 static int ext2_sbupdate(struct ext2mount *, int);
70 static int ext2_cgupdate(struct ext2mount *, int);
71 static vfs_unmount_t ext2_unmount;
72 static vfs_root_t ext2_root;
73 static vfs_statfs_t ext2_statfs;
74 static vfs_sync_t ext2_sync;
75 static vfs_vget_t ext2_vget;
76 static vfs_fhtovp_t ext2_fhtovp;
77 static vfs_mount_t ext2_mount;
79 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
80 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
82 static struct vfsops ext2fs_vfsops = {
83 .vfs_fhtovp = ext2_fhtovp,
84 .vfs_mount = ext2_mount,
85 .vfs_root = ext2_root, /* root inode via vget */
86 .vfs_statfs = ext2_statfs,
87 .vfs_sync = ext2_sync,
88 .vfs_unmount = ext2_unmount,
89 .vfs_vget = ext2_vget,
92 VFS_SET(ext2fs_vfsops, ext2fs, 0);
94 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
96 static int compute_sb_data(struct vnode * devvp,
97 struct ext2fs * es, struct m_ext2fs * fs);
99 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr",
100 "noclusterw", "noexec", "export", "force", "from", "multilabel",
101 "suiddir", "nosymfollow", "sync", "union", NULL };
109 ext2_mount(struct mount *mp)
111 struct vfsoptlist *opts;
114 struct ext2mount *ump = 0;
116 struct nameidata nd, *ndp = &nd;
119 int error, flags, len;
122 opts = mp->mnt_optnew;
124 if (vfs_filteropt(opts, ext2_opts))
127 vfs_getopt(opts, "fspath", (void **)&path, NULL);
128 /* Double-check the length of path.. */
129 if (strlen(path) >= MAXMNTLEN - 1)
130 return (ENAMETOOLONG);
133 error = vfs_getopt(opts, "from", (void **)&fspec, &len);
134 if (!error && fspec[len - 1] != '\0')
138 * If updating, check whether changing from read-only to
139 * read/write; if there is no device name, that's all we do.
141 if (mp->mnt_flag & MNT_UPDATE) {
145 if (fs->e2fs_ronly == 0 &&
146 vfs_flagopt(opts, "ro", NULL, 0)) {
147 error = VFS_SYNC(mp, MNT_WAIT);
151 if (mp->mnt_flag & MNT_FORCE)
153 error = ext2_flushfiles(mp, flags, td);
154 if ( error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) {
155 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
156 ext2_sbupdate(ump, MNT_WAIT);
159 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
162 g_access(ump->um_cp, 0, -1, 0);
166 if (!error && (mp->mnt_flag & MNT_RELOAD))
167 error = ext2_reload(mp, td);
170 devvp = ump->um_devvp;
171 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) {
172 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
176 * If upgrade to read-write by non-root, then verify
177 * that user has necessary permissions on the device.
179 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
180 error = VOP_ACCESS(devvp, VREAD | VWRITE,
183 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
185 VOP_UNLOCK(devvp, 0);
188 VOP_UNLOCK(devvp, 0);
191 error = g_access(ump->um_cp, 0, 1, 0);
197 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 ||
198 (fs->e2fs->e2fs_state & E2FS_ERRORS)) {
199 if (mp->mnt_flag & MNT_FORCE) {
201 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt);
204 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
209 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;
210 (void)ext2_cgupdate(ump, MNT_WAIT);
213 mp->mnt_flag &= ~MNT_RDONLY;
216 if (vfs_flagopt(opts, "export", NULL, 0)) {
217 /* Process export requests in vfs_mount.c. */
223 * Not an update, or updating the name: look up the name
224 * and verify that it refers to a sensible disk device.
228 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
229 if ((error = namei(ndp)) != 0)
231 NDFREE(ndp, NDF_ONLY_PNBUF);
234 if (!vn_isdisk(devvp, &error)) {
240 * If mount by non-root, then verify that user has necessary
241 * permissions on the device.
243 * XXXRW: VOP_ACCESS() enough?
246 if ((mp->mnt_flag & MNT_RDONLY) == 0)
248 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
250 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
256 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
257 error = ext2_mountfs(devvp, mp);
259 if (devvp != ump->um_devvp) {
261 return (EINVAL); /* needs translation */
273 * Note that this strncpy() is ok because of a check at the start
276 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN);
277 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0';
278 vfs_mountedfrom(mp, fspec);
283 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly)
286 if (es->e2fs_magic != E2FS_MAGIC) {
287 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
288 devtoname(dev), es->e2fs_magic, E2FS_MAGIC);
291 if (es->e2fs_rev > E2FS_REV0) {
292 if (es->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) {
294 "WARNING: mount of %s denied due to unsupported optional features\n",
299 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) {
300 printf("WARNING: R/W mount of %s denied due to "
301 "unsupported optional features\n", devtoname(dev));
309 * This computes the fields of the ext2_sb_info structure from the
310 * data in the ext2_super_block structure read in.
313 compute_sb_data(struct vnode *devvp, struct ext2fs *es,
318 int logic_sb_block = 1; /* XXX for now */
321 fs->e2fs_bsize = EXT2_MIN_BLOCK_SIZE << es->e2fs_log_bsize;
322 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
323 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
324 fs->e2fs_qbmask = fs->e2fs_bsize - 1;
325 fs->e2fs_blocksize_bits = es->e2fs_log_bsize + 10;
326 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize;
328 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
329 fs->e2fs_bpg = es->e2fs_bpg;
330 fs->e2fs_fpg = es->e2fs_fpg;
331 fs->e2fs_ipg = es->e2fs_ipg;
332 if (es->e2fs_rev == E2FS_REV0) {
333 fs->e2fs_first_inode = EXT2_FIRSTINO;
334 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ;
336 fs->e2fs_first_inode = es->e2fs_first_ino;
337 fs->e2fs_isize = es->e2fs_inode_size;
340 * Simple sanity check for superblock inode size value.
342 if (fs->e2fs_isize < E2FS_REV0_INODE_SIZE ||
343 fs->e2fs_isize > fs->e2fs_bsize ||
344 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
345 printf("EXT2-fs: invalid inode size %d\n",
350 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
351 fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb;
352 fs->e2fs_descpb = fs->e2fs_bsize / sizeof (struct ext2_gd);
353 /* s_resuid / s_resgid ? */
354 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock +
355 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
356 db_count = (fs->e2fs_gcount + EXT2_DESC_PER_BLOCK(fs) - 1) /
357 EXT2_DESC_PER_BLOCK(fs);
358 fs->e2fs_gdbcount = db_count;
359 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
360 M_EXT2MNT, M_WAITOK);
361 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * sizeof(*fs->e2fs_contigdirs),
362 M_EXT2MNT, M_WAITOK);
365 * Adjust logic_sb_block.
366 * Godmar thinks: if the blocksize is greater than 1024, then
367 * the superblock is logically part of block zero.
369 if(fs->e2fs_bsize > SBSIZE)
371 for (i = 0; i < db_count; i++) {
372 error = bread(devvp ,
373 fsbtodb(fs, logic_sb_block + i + 1 ),
374 fs->e2fs_bsize, NOCRED, &bp);
376 free(fs->e2fs_gd, M_EXT2MNT);
380 e2fs_cgload((struct ext2_gd *)bp->b_data,
382 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
387 fs->e2fs_total_dir = 0;
388 for (i=0; i < fs->e2fs_gcount; i++){
389 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs;
390 fs->e2fs_contigdirs[i] = 0;
392 if (es->e2fs_rev == E2FS_REV0 ||
393 (es->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE) == 0)
394 fs->e2fs_maxfilesize = 0x7fffffff;
396 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
401 * Reload all incore data for a filesystem (used after running fsck on
402 * the root filesystem and finding things to fix). The filesystem must
403 * be mounted read-only.
405 * Things to do to update the mount:
406 * 1) invalidate all cached meta-data.
407 * 2) re-read superblock from disk.
408 * 3) re-read summary information from disk.
409 * 4) invalidate all inactive vnodes.
410 * 5) invalidate all cached file data.
411 * 6) re-read inode data for all active vnodes.
412 * XXX we are missing some steps, in particular # 3, this has to be reviewed.
415 ext2_reload(struct mount *mp, struct thread *td)
417 struct vnode *vp, *mvp, *devvp;
424 if ((mp->mnt_flag & MNT_RDONLY) == 0)
427 * Step 1: invalidate all cached meta-data.
429 devvp = VFSTOEXT2(mp)->um_devvp;
430 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
431 if (vinvalbuf(devvp, 0, 0, 0) != 0)
432 panic("ext2_reload: dirty1");
433 VOP_UNLOCK(devvp, 0);
436 * Step 2: re-read superblock from disk.
437 * constants have been adjusted for ext2
439 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
441 es = (struct ext2fs *)bp->b_data;
442 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
444 return (EIO); /* XXX needs translation */
446 fs = VFSTOEXT2(mp)->um_e2fs;
447 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
449 if((error = compute_sb_data(devvp, es, fs)) != 0) {
454 if (fs->fs_sbsize < SBSIZE)
455 bp->b_flags |= B_INVAL;
461 MNT_VNODE_FOREACH(vp, mp, mvp) {
463 if (vp->v_iflag & VI_DOOMED) {
469 * Step 4: invalidate all cached file data.
471 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
472 MNT_VNODE_FOREACH_ABORT(mp, mvp);
475 if (vinvalbuf(vp, 0, 0, 0))
476 panic("ext2_reload: dirty2");
479 * Step 5: re-read inode data for all active vnodes.
482 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
483 (int)fs->e2fs_bsize, NOCRED, &bp);
487 MNT_VNODE_FOREACH_ABORT(mp, mvp);
490 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
491 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
502 * Common code for mount and mountroot.
505 ext2_mountfs(struct vnode *devvp, struct mount *mp)
507 struct ext2mount *ump;
511 struct cdev *dev = devvp->v_rdev;
512 struct g_consumer *cp;
517 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
518 /* XXX: use VOP_ACESS to check FS perms */
521 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
524 VOP_UNLOCK(devvp, 0);
528 /* XXX: should we check for some sectorsize or 512 instead? */
529 if (((SBSIZE % cp->provider->sectorsize) != 0) ||
530 (SBSIZE < cp->provider->sectorsize)) {
539 bo = &devvp->v_bufobj;
541 bo->bo_ops = g_vfs_bufops;
542 if (devvp->v_rdev->si_iosize_max != 0)
543 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
544 if (mp->mnt_iosize_max > MAXPHYS)
545 mp->mnt_iosize_max = MAXPHYS;
549 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
551 es = (struct ext2fs *)bp->b_data;
552 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
553 error = EINVAL; /* XXX needs translation */
556 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
557 (es->e2fs_state & E2FS_ERRORS)) {
558 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
560 "WARNING: Filesystem was not properly dismounted\n");
563 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
568 ump = malloc(sizeof *ump, M_EXT2MNT, M_WAITOK);
569 bzero((caddr_t)ump, sizeof *ump);
572 * I don't know whether this is the right strategy. Note that
573 * we dynamically allocate both an ext2_sb_info and an ext2_super_block
574 * while Linux keeps the super block in a locked buffer.
576 ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
577 M_EXT2MNT, M_WAITOK);
578 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
579 M_EXT2MNT, M_WAITOK);
580 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
581 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
582 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
588 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
591 * If the fs is not mounted read-only, make sure the super block is
592 * always written back on a sync().
594 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
596 fs->e2fs_fmod = 1; /* mark it modified */
597 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */
600 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
601 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
602 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
604 mp->mnt_flag |= MNT_LOCAL;
608 ump->um_devvp = devvp;
609 ump->um_bo = &devvp->v_bufobj;
613 * Setting those two parameters allowed us to use
614 * ufs_bmap w/o changse!
616 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
617 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
618 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
620 ext2_sbupdate(ump, MNT_WAIT);
622 * Initialize filesystem stat information in mount struct.
625 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED |
626 MNTK_EXTENDED_SHARED;
640 mtx_destroy(EXT2_MTX(ump));
641 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
642 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
643 free(ump->um_e2fs->e2fs, M_EXT2MNT);
644 free(ump->um_e2fs, M_EXT2MNT);
645 free(ump, M_EXT2MNT);
652 * Unmount system call.
655 ext2_unmount(struct mount *mp, int mntflags)
657 struct ext2mount *ump;
659 int error, flags, ronly;
662 if (mntflags & MNT_FORCE) {
663 if (mp->mnt_flag & MNT_ROOTFS)
667 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
671 ronly = fs->e2fs_ronly;
672 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
673 if (fs->e2fs_wasvalid)
674 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
675 ext2_sbupdate(ump, MNT_WAIT);
680 g_vfs_close(ump->um_cp);
683 vrele(ump->um_devvp);
684 free(fs->e2fs_gd, M_EXT2MNT);
685 free(fs->e2fs_contigdirs, M_EXT2MNT);
686 free(fs->e2fs, M_EXT2MNT);
688 free(ump, M_EXT2MNT);
691 mp->mnt_flag &= ~MNT_LOCAL;
697 * Flush out all the files in a filesystem.
700 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
704 error = vflush(mp, 0, flags, td);
708 * Get file system statistics.
711 ext2_statfs(struct mount *mp, struct statfs *sbp)
713 struct ext2mount *ump;
715 uint32_t overhead, overhead_per_group, ngdb;
720 if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
721 panic("ext2fs_statvfs");
724 * Compute the overhead (FS structures)
727 1 /* block bitmap */ +
728 1 /* inode bitmap */ +
730 overhead = fs->e2fs->e2fs_first_dblock +
731 fs->e2fs_gcount * overhead_per_group;
732 if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
733 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
734 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
739 ngroups = fs->e2fs_gcount;
741 ngdb = fs->e2fs_gdbcount;
742 if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
743 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
744 ngdb += fs->e2fs->e2fs_reserved_ngdb;
745 overhead += ngroups * (1 /* superblock */ + ngdb);
747 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
748 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
749 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead;
750 sbp->f_bfree = fs->e2fs->e2fs_fbcount;
751 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount;
752 sbp->f_files = fs->e2fs->e2fs_icount;
753 sbp->f_ffree = fs->e2fs->e2fs_ficount;
758 * Go through the disk queues to initiate sandbagged IO;
759 * go through the inodes to write those that have been modified;
760 * initiate the writing of the super block if it has been modified.
762 * Note: we are always called with the filesystem marked `MPBUSY'.
765 ext2_sync(struct mount *mp, int waitfor)
767 struct vnode *mvp, *vp;
770 struct ext2mount *ump = VFSTOEXT2(mp);
772 int error, allerror = 0;
776 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
777 printf("fs = %s\n", fs->e2fs_fsmnt);
778 panic("ext2_sync: rofs mod");
782 * Write back each (modified) inode.
786 MNT_VNODE_FOREACH(vp, mp, mvp) {
788 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) {
795 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
796 (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
797 waitfor == MNT_LAZY)) {
802 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
805 if (error == ENOENT) {
806 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
811 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
820 * Force stale file system control information to be flushed.
822 if (waitfor != MNT_LAZY) {
823 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
824 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
826 VOP_UNLOCK(ump->um_devvp, 0);
830 * Write back modified superblock.
832 if (fs->e2fs_fmod != 0) {
834 fs->e2fs->e2fs_wtime = time_second;
835 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
842 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
843 * in from disk. If it is in core, wait for the lock bit to clear, then
844 * return the inode locked. Detection and handling of mount points must be
845 * done by the calling routine.
848 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
852 struct ext2mount *ump;
861 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
862 if (error || *vpp != NULL)
869 * If this malloc() is performed after the getnewvnode()
870 * it might block, leaving a vnode with a NULL v_data to be
871 * found by ext2_sync() if a sync happens to fire right then,
872 * which will cause a panic because ext2_sync() blindly
873 * dereferences vp->v_data (as well it should).
875 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
877 /* Allocate a new vnode/inode. */
878 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
880 free(ip, M_EXT2NODE);
885 ip->i_e2fs = fs = ump->um_e2fs;
889 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
890 error = insmntque(vp, mp);
892 free(ip, M_EXT2NODE);
896 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
897 if (error || *vpp != NULL)
900 /* Read in the disk contents for the inode, copy into the inode. */
901 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
902 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
904 * The inode does not contain anything useful, so it would
905 * be misleading to leave it on its hash chain. With mode
906 * still zero, it will be unlinked and returned to the free
914 /* convert ext2 inode to dinode */
915 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
916 ino_to_fsbo(fs, ino)), ip);
917 ip->i_block_group = ino_to_cg(fs, ino);
918 ip->i_next_alloc_block = 0;
919 ip->i_next_alloc_goal = 0;
920 ip->i_prealloc_count = 0;
921 ip->i_prealloc_block = 0;
924 * Now we want to make sure that block pointers for unused
925 * blocks are zeroed out - ext2_balloc depends on this
926 * although for regular files and directories only
928 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
929 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
930 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
934 ext2_print_inode(ip);
939 * Initialize the vnode from the inode, check for aliases.
940 * Note that the underlying vnode may have changed.
942 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
949 * Finish inode initialization.
953 * Set up a generation number for this inode if it does not
954 * already have one. This should only happen on old filesystems.
956 if (ip->i_gen == 0) {
957 ip->i_gen = random() / 2 + 1;
958 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
959 ip->i_flag |= IN_MODIFIED;
966 * File handle to vnode
968 * Have to be really careful about stale file handles:
969 * - check that the inode number is valid
970 * - call ext2_vget() to get the locked inode
971 * - check for an unallocated inode (i_mode == 0)
972 * - check that the given client host has export rights and return
973 * those rights via. exflagsp and credanonp
976 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
984 ufhp = (struct ufid *)fhp;
985 fs = VFSTOEXT2(mp)->um_e2fs;
986 if (ufhp->ufid_ino < EXT2_ROOTINO ||
987 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
990 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
996 if (ip->i_mode == 0 ||
997 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
1003 vnode_create_vobject(*vpp, 0, curthread);
1008 * Write a superblock and associated information back to disk.
1011 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1013 struct m_ext2fs *fs = mp->um_e2fs;
1014 struct ext2fs *es = fs->e2fs;
1018 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
1019 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
1020 if (waitfor == MNT_WAIT)
1026 * The buffers for group descriptors, inode bitmaps and block bitmaps
1027 * are not busy at this point and are (hopefully) written by the
1028 * usual sync mechanism. No need to write them here.
1033 ext2_cgupdate(struct ext2mount *mp, int waitfor)
1035 struct m_ext2fs *fs = mp->um_e2fs;
1037 int i, error = 0, allerror = 0;
1039 allerror = ext2_sbupdate(mp, waitfor);
1040 for (i = 0; i < fs->e2fs_gdbcount; i++) {
1041 bp = getblk(mp->um_devvp, fsbtodb(fs,
1042 fs->e2fs->e2fs_first_dblock +
1043 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
1044 e2fs_cgsave(&fs->e2fs_gd[
1045 i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
1046 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
1047 if (waitfor == MNT_WAIT)
1053 if (!allerror && error)
1058 * Return the root of a filesystem.
1061 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
1066 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);