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.
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12 * modification, are permitted provided that the following conditions
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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 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
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39 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
40 * $FreeBSD: src/sys/gnu/ext2fs/ext2_vfsops.c,v 1.63.2.7 2002/07/01 00:18:51 iedowse Exp $
43 #include "opt_quota.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/nlookup.h>
50 #include <sys/kernel.h>
51 #include <sys/vnode.h>
52 #include <sys/mount.h>
55 #include <sys/fcntl.h>
56 #include <sys/diskslice.h>
57 #include <sys/malloc.h>
59 #include <vm/vm_zone.h>
62 #include <sys/thread2.h>
67 #include "ext2mount.h"
68 #include "ext2_extern.h"
72 #include "ext2_fs_sb.h"
74 extern struct vop_ops ext2_vnode_vops;
75 extern struct vop_ops ext2_spec_vops;
76 extern struct vop_ops ext2_fifo_vops;
78 static int ext2_fhtovp (struct mount *, struct vnode *,
79 struct fid *, struct vnode **);
80 static int ext2_flushfiles (struct mount *mp, int flags);
81 static int ext2_mount (struct mount *, char *, caddr_t, struct ucred *);
82 static int ext2_mountfs (struct vnode *, struct mount *, struct ucred *);
83 static int ext2_root(struct mount *, struct vnode **);
84 static int ext2_reload (struct mount *mountp, struct ucred *cred);
85 static int ext2_sbupdate (struct ext2mount *, int);
86 static int ext2_statfs (struct mount *, struct statfs *, struct ucred *);
87 static int ext2_sync (struct mount *, int);
88 static int ext2_unmount (struct mount *, int);
89 static int ext2_vget (struct mount *, struct vnode *, ino_t, struct vnode **);
90 static int ext2_init(struct vfsconf *);
91 static int ext2_vptofh (struct vnode *, struct fid *);
93 static MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part");
94 MALLOC_DEFINE(M_EXT2MNT, "EXT2 mount", "EXT2 mount structure");
96 static struct vfsops ext2fs_vfsops = {
97 .vfs_mount = ext2_mount,
98 .vfs_unmount = ext2_unmount,
99 .vfs_root = ext2_root, /* root inode via vget */
100 .vfs_quotactl = ext2_quotactl, /* quota operations */
101 .vfs_statfs = ext2_statfs,
102 .vfs_sync = ext2_sync,
103 .vfs_vget = ext2_vget,
104 .vfs_fhtovp = ext2_fhtovp,
105 .vfs_checkexp = ext2_check_export,
106 .vfs_vptofh = ext2_vptofh,
107 .vfs_init = ext2_init,
108 .vfs_uninit = ext2_uninit
111 VFS_SET(ext2fs_vfsops, ext2fs, 0);
112 MODULE_VERSION(ext2fs, 1);
114 static int ext2fs_inode_hash_lock;
116 static int ext2_check_sb_compat (struct ext2_super_block *es,
117 cdev_t dev, int ronly);
118 static int compute_sb_data (struct vnode * devvp,
119 struct ext2_super_block * es,
120 struct ext2_sb_info * fs);
123 ext2_root(struct mount *mp, struct vnode **vpp)
128 error = VFS_VGET(mp, NULL, (ino_t)EXT2_ROOTINO, &nvp);
136 * Do operations associated with quotas
139 ext2_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
145 int cmd, type, error;
147 type = cmds & SUBCMDMASK;
148 cmd = cmds >> SUBCMDSHIFT;
169 error = priv_check_cred(cred, PRIV_UFS_QUOTAON, 0);
173 error = priv_check_cred(cred, PRIV_UFS_QUOTAOFF, 0);
177 error = priv_check_cred(cred, PRIV_VFS_SETQUOTA, 0);
181 error = priv_check_cred(cred, PRIV_UFS_SETUSE, 0);
185 if (uid == cred->cr_ruid)
188 error = priv_check_cred(cred, PRIV_VFS_GETQUOTA, 0);
204 if ((uint)type >= MAXQUOTAS)
206 if (vfs_busy(mp, LK_NOWAIT))
212 error = ext2_quotaon(cred, mp, type, arg);
216 error = ext2_quotaoff(mp, type);
220 error = ext2_setquota(mp, uid, type, arg);
224 error = ext2_setuse(mp, uid, type, arg);
228 error = ext2_getquota(mp, uid, type, arg);
232 error = ext2_qsync(mp);
245 * Initial UFS filesystems, done only once.
248 ext2_init(struct vfsconf *vfsp)
268 * data: this is actually a (struct ext2_args *)
271 ext2_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
274 struct ext2_args args;
275 struct ext2mount *ump = NULL;
276 struct ext2_sb_info *fs;
280 struct nlookupdata nd;
282 if ((error = copyin(data, (caddr_t)&args, sizeof (struct ext2_args))) != 0)
286 * If updating, check whether changing from read-only to
287 * read/write; if there is no device name, that's all we do.
289 if (mp->mnt_flag & MNT_UPDATE) {
292 devvp = ump->um_devvp;
294 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
296 if (mp->mnt_flag & MNT_FORCE)
298 if (vfs_busy(mp, LK_NOWAIT))
300 error = ext2_flushfiles(mp, flags);
302 if (!error && fs->s_wasvalid) {
303 fs->s_es->s_state |= EXT2_VALID_FS;
304 ext2_sbupdate(ump, MNT_WAIT);
307 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
308 VOP_OPEN(devvp, FREAD, FSCRED, NULL);
309 VOP_CLOSE(devvp, FREAD|FWRITE, NULL);
312 if (!error && (mp->mnt_flag & MNT_RELOAD))
313 error = ext2_reload(mp, cred);
316 if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev,
317 (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0)
319 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
321 * If upgrade to read-write by non-root, then verify
322 * that user has necessary permissions on the device.
324 if (cred->cr_uid != 0) {
325 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
326 error = VOP_EACCESS(devvp, VREAD | VWRITE, cred);
334 if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 ||
335 (fs->s_es->s_state & EXT2_ERROR_FS)) {
336 if (mp->mnt_flag & MNT_FORCE) {
338 "WARNING: %s was not properly dismounted\n",
342 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
347 fs->s_es->s_state &= ~EXT2_VALID_FS;
348 ext2_sbupdate(ump, MNT_WAIT);
350 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
351 VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL);
352 VOP_CLOSE(devvp, FREAD, NULL);
355 if (args.fspec == NULL) {
357 * Process export requests.
359 return (vfs_export(mp, &ump->um_export, &args.export));
363 * Not an update, or updating the name: look up the name
364 * and verify that it refers to a sensible block device.
367 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
369 error = nlookup(&nd);
371 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
376 if (!vn_isdisk(devvp, &error)) {
382 * If mount by non-root, then verify that user has necessary
383 * permissions on the device.
385 if (cred->cr_uid != 0) {
387 if ((mp->mnt_flag & MNT_RDONLY) == 0)
388 accessmode |= VWRITE;
389 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
390 if ((error = VOP_EACCESS(devvp, accessmode, cred)) != 0) {
397 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
398 error = ext2_mountfs(devvp, mp, cred);
400 if (devvp != ump->um_devvp)
401 error = EINVAL; /* needs translation */
411 copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
412 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
413 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
414 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
415 ext2_statfs(mp, &mp->mnt_stat, cred);
420 * checks that the data in the descriptor blocks make sense
421 * this is taken from ext2/super.c
424 ext2_check_descriptors(struct ext2_sb_info *sb)
428 unsigned long block = sb->s_es->s_first_data_block;
429 struct ext2_group_desc * gdp = NULL;
431 /* ext2_debug ("Checking group descriptors"); */
433 for (i = 0; i < sb->s_groups_count; i++)
435 /* examine next descriptor block */
436 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
437 gdp = (struct ext2_group_desc *)
438 sb->s_group_desc[desc_block++]->b_data;
439 if (gdp->bg_block_bitmap < block ||
440 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
442 kprintf ("ext2_check_descriptors: "
443 "Block bitmap for group %d"
444 " not in group (block %lu)!\n",
445 i, (unsigned long) gdp->bg_block_bitmap);
448 if (gdp->bg_inode_bitmap < block ||
449 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
451 kprintf ("ext2_check_descriptors: "
452 "Inode bitmap for group %d"
453 " not in group (block %lu)!\n",
454 i, (unsigned long) gdp->bg_inode_bitmap);
457 if (gdp->bg_inode_table < block ||
458 gdp->bg_inode_table + sb->s_itb_per_group >=
459 block + EXT2_BLOCKS_PER_GROUP(sb))
461 kprintf ("ext2_check_descriptors: "
462 "Inode table for group %d"
463 " not in group (block %lu)!\n",
464 i, (unsigned long) gdp->bg_inode_table);
467 block += EXT2_BLOCKS_PER_GROUP(sb);
474 ext2_check_sb_compat(struct ext2_super_block *es, cdev_t dev, int ronly)
476 if (es->s_magic != EXT2_SUPER_MAGIC) {
477 kprintf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
478 devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC);
481 if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
482 if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
484 "WARNING: mount of %s denied due to unsupported optional features\n",
489 (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
491 "WARNING: R/W mount of %s denied due to unsupported optional features\n",
500 * this computes the fields of the ext2_sb_info structure from the
501 * data in the ext2_super_block structure read in
504 compute_sb_data(struct vnode *devvp, struct ext2_super_block *es,
505 struct ext2_sb_info *fs)
509 int logic_sb_block = 1; /* XXX for now */
514 #define V(v) kprintf(#v"= %d\n", fs->v);
517 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
519 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
521 fs->s_fsbtodb = es->s_log_block_size + 1;
523 fs->s_qbmask = fs->s_blocksize - 1;
525 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
527 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
530 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
532 fs->s_blocks_per_group = es->s_blocks_per_group;
533 V(s_blocks_per_group)
534 fs->s_frags_per_group = es->s_frags_per_group;
536 fs->s_inodes_per_group = es->s_inodes_per_group;
537 V(s_inodes_per_group)
538 if (es->s_rev_level == EXT2_GOOD_OLD_REV) {
539 fs->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
540 fs->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
542 fs->s_first_ino = es->s_first_ino;
543 fs->s_inode_size = es->s_inode_size;
545 * Simple sanity check for superblock inode size value.
547 if (fs->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE ||
548 fs->s_inode_size > fs->s_blocksize ||
549 (fs->s_inode_size & (fs->s_inode_size - 1)) != 0) {
550 kprintf("EXT2-fs: invalid inode size %d\n",
557 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE(fs);
558 V(s_inodes_per_block)
559 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
561 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
563 /* s_resuid / s_resgid ? */
564 fs->s_groups_count = (es->s_blocks_count -
565 es->s_first_data_block +
566 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
567 EXT2_BLOCKS_PER_GROUP(fs);
569 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
570 EXT2_DESC_PER_BLOCK(fs);
571 fs->s_db_per_group = db_count;
574 fs->s_group_desc = kmalloc(db_count * sizeof (struct buf *),
575 M_EXT2MNT, M_WAITOK);
577 /* adjust logic_sb_block */
578 if(fs->s_blocksize > SBSIZE)
579 /* Godmar thinks: if the blocksize is greater than 1024, then
580 the superblock is logically part of block zero.
584 for (i = 0; i < db_count; i++) {
585 error = bread(devvp, fsbtodoff(fs, logic_sb_block + i + 1),
586 fs->s_blocksize, &fs->s_group_desc[i]);
588 for (j = 0; j < i; j++)
589 brelse(fs->s_group_desc[j]);
590 kfree(fs->s_group_desc, M_EXT2MNT);
591 kprintf("EXT2-fs: unable to read group descriptors (%d)\n", error);
594 /* Set the B_LOCKED flag on the buffer, then brelse() it */
595 LCK_BUF(fs->s_group_desc[i])
597 if(!ext2_check_descriptors(fs)) {
598 for (j = 0; j < db_count; j++)
599 ULCK_BUF(fs->s_group_desc[j])
600 kfree(fs->s_group_desc, M_EXT2MNT);
601 kprintf("EXT2-fs: (ext2_check_descriptors failure) "
602 "unable to read group descriptors\n");
606 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
607 fs->s_inode_bitmap_number[i] = 0;
608 fs->s_inode_bitmap[i] = NULL;
609 fs->s_block_bitmap_number[i] = 0;
610 fs->s_block_bitmap[i] = NULL;
612 fs->s_loaded_inode_bitmaps = 0;
613 fs->s_loaded_block_bitmaps = 0;
618 * Reload all incore data for a filesystem (used after running fsck on
619 * the root filesystem and finding things to fix). The filesystem must
620 * be mounted read-only.
622 * Things to do to update the mount:
623 * 1) invalidate all cached meta-data.
624 * 2) re-read superblock from disk.
625 * 3) re-read summary information from disk.
626 * 4) invalidate all inactive vnodes.
627 * 5) invalidate all cached file data.
628 * 6) re-read inode data for all active vnodes.
630 static int ext2_reload_scan(struct mount *mp, struct vnode *vp, void *rescan);
637 struct ext2_sb_info *fs;
641 ext2_reload(struct mount *mountp, struct ucred *cred)
645 struct ext2_super_block * es;
646 struct ext2_sb_info *fs;
648 struct scaninfo scaninfo;
650 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
653 * Step 1: invalidate all cached meta-data.
655 devvp = VFSTOEXT2(mountp)->um_devvp;
656 if (vinvalbuf(devvp, 0, 0, 0))
657 panic("ext2_reload: dirty1");
659 * Step 2: re-read superblock from disk.
660 * constants have been adjusted for ext2
662 if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
664 es = (struct ext2_super_block *)bp->b_data;
665 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
667 return (EIO); /* XXX needs translation */
669 fs = VFSTOEXT2(mountp)->um_e2fs;
670 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
672 if((error = compute_sb_data(devvp, es, fs)) != 0) {
677 if (fs->fs_sbsize < SBSIZE)
678 bp->b_flags |= B_INVAL;
683 scaninfo.devvp = devvp;
685 while (error == 0 && scaninfo.rescan) {
687 error = vmntvnodescan(mountp, VMSC_GETVX,
688 NULL, ext2_reload_scan, &scaninfo);
694 ext2_reload_scan(struct mount *mp, struct vnode *vp, void *data)
696 struct scaninfo *info = data;
708 * Step 5: invalidate all cached file data.
710 if (vinvalbuf(vp, 0, 0, 0))
711 panic("ext2_reload: dirty2");
713 * Step 6: re-read inode data for all active vnodes.
716 error = bread(info->devvp,
717 fsbtodoff(info->fs, ino_to_fsba(info->fs, ip->i_number)),
718 (int)info->fs->s_blocksize, &bp);
721 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
722 EXT2_INODE_SIZE(info->fs) * ino_to_fsbo(info->fs, ip->i_number)),
729 * Common code for mount and mountroot
732 ext2_mountfs(struct vnode *devvp, struct mount *mp, struct ucred *cred)
734 struct ext2mount *ump;
736 struct ext2_sb_info *fs;
737 struct ext2_super_block * es;
739 struct partinfo dpart;
744 * Disallow multiple mounts of the same device.
745 * Disallow mounting of a device that is currently in use
746 * (except for root, which might share swap device for miniroot).
747 * Flush out any old buffers remaining from a previous use.
749 if ((error = vfs_mountedon(devvp)) != 0)
751 if (vcount(devvp) > 0)
753 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)) != 0)
756 /* turn on this to force it to be read-only */
757 mp->mnt_flag |= MNT_RDONLY;
760 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
761 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
762 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL);
767 if (dev->si_iosize_max != 0)
768 mp->mnt_iosize_max = dev->si_iosize_max;
769 if (mp->mnt_iosize_max > MAXPHYS)
770 mp->mnt_iosize_max = MAXPHYS;
771 VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, NULL);
775 if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
777 es = (struct ext2_super_block *)bp->b_data;
778 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
779 error = EINVAL; /* XXX needs translation */
782 if ((es->s_state & EXT2_VALID_FS) == 0 ||
783 (es->s_state & EXT2_ERROR_FS)) {
784 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
786 "WARNING: Filesystem was not properly dismounted\n");
789 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
794 ump = kmalloc(sizeof *ump, M_EXT2MNT, M_WAITOK | M_ZERO);
795 ump->um_malloctype = M_EXT2NODE;
796 ump->um_blkatoff = ext2_blkatoff;
797 ump->um_truncate = ext2_truncate;
798 ump->um_update = ext2_update;
799 ump->um_valloc = ext2_valloc;
800 ump->um_vfree = ext2_vfree;
801 /* I don't know whether this is the right strategy. Note that
802 we dynamically allocate both a ext2_sb_info and a ext2_super_block
803 while Linux keeps the super block in a locked buffer
805 ump->um_e2fs = kmalloc(sizeof(struct ext2_sb_info),
806 M_EXT2MNT, M_WAITOK);
807 ump->um_e2fs->s_es = kmalloc(sizeof(struct ext2_super_block),
808 M_EXT2MNT, M_WAITOK);
809 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
810 if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)))
813 * We don't free the group descriptors allocated by compute_sb_data()
814 * until ext2_unmount(). This is OK since the mount will succeed.
819 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
820 /* if the fs is not mounted read-only, make sure the super block is
821 always written back on a sync()
823 fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0;
825 fs->s_dirt = 1; /* mark it modified */
826 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
828 mp->mnt_data = (qaddr_t)ump;
829 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
830 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
831 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
832 mp->mnt_flag |= MNT_LOCAL;
835 ump->um_devvp = devvp;
836 /* setting those two parameters allows us to use
837 ext2_bmap w/o changse !
839 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
840 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
841 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
842 for (i = 0; i < MAXQUOTAS; i++)
843 ump->um_quotas[i] = NULLVP;
844 dev->si_mountpoint = mp;
846 vfs_add_vnodeops(mp, &ext2_vnode_vops, &mp->mnt_vn_norm_ops);
847 vfs_add_vnodeops(mp, &ext2_spec_vops, &mp->mnt_vn_spec_ops);
848 vfs_add_vnodeops(mp, &ext2_fifo_vops, &mp->mnt_vn_fifo_ops);
851 ext2_sbupdate(ump, MNT_WAIT);
856 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
857 VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NULL);
860 kfree(ump->um_e2fs->s_es, M_EXT2MNT);
861 kfree(ump->um_e2fs, M_EXT2MNT);
862 kfree(ump, M_EXT2MNT);
863 mp->mnt_data = (qaddr_t)0;
869 * unmount system call
872 ext2_unmount(struct mount *mp, int mntflags)
874 struct ext2mount *ump;
875 struct ext2_sb_info *fs;
876 int error, flags, ronly, i;
879 if (mntflags & MNT_FORCE) {
880 if (mp->mnt_flag & MNT_ROOTFS)
884 if ((error = ext2_flushfiles(mp, flags)) != 0)
888 ronly = fs->s_rd_only;
891 fs->s_es->s_state |= EXT2_VALID_FS;
892 ext2_sbupdate(ump, MNT_WAIT);
895 /* release buffers containing group descriptors */
896 for(i = 0; i < fs->s_db_per_group; i++)
897 ULCK_BUF(fs->s_group_desc[i])
898 kfree(fs->s_group_desc, M_EXT2MNT);
900 /* release cached inode/block bitmaps */
901 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
902 if (fs->s_inode_bitmap[i])
903 ULCK_BUF(fs->s_inode_bitmap[i])
905 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
906 if (fs->s_block_bitmap[i])
907 ULCK_BUF(fs->s_block_bitmap[i])
909 ump->um_devvp->v_rdev->si_mountpoint = NULL;
911 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
912 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, NULL);
913 vn_unlock(ump->um_devvp);
915 vrele(ump->um_devvp);
916 kfree(fs->s_es, M_EXT2MNT);
917 kfree(fs, M_EXT2MNT);
918 kfree(ump, M_EXT2MNT);
919 mp->mnt_data = (qaddr_t)0;
920 mp->mnt_flag &= ~MNT_LOCAL;
925 * Flush out all the files in a filesystem.
928 ext2_flushfiles(struct mount *mp, int flags)
930 struct ext2mount *ump;
938 if (mp->mnt_flag & MNT_QUOTA) {
939 if ((error = vflush(mp, 0, SKIPSYSTEM|flags)) != 0)
941 for (i = 0; i < MAXQUOTAS; i++) {
942 if (ump->um_quotas[i] == NULLVP)
944 ext2_quotaoff(mp, i);
947 * Here we fall through to vflush again to ensure
948 * that we have gotten rid of all the system vnodes.
952 error = vflush(mp, 0, flags);
957 * Get file system statistics.
958 * taken from ext2/super.c ext2_statfs
961 ext2_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
963 unsigned long overhead;
964 struct ext2mount *ump;
965 struct ext2_sb_info *fs;
966 struct ext2_super_block *es;
973 if (es->s_magic != EXT2_SUPER_MAGIC)
974 panic("ext2_statfs - magic number spoiled");
977 * Compute the overhead (FS structures)
979 if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) {
981 for (i = 0 ; i < fs->s_groups_count; i++)
982 if (ext2_group_sparse(i))
985 nsb = fs->s_groups_count;
986 overhead = es->s_first_data_block +
987 /* Superblocks and block group descriptors: */
988 nsb * (1 + fs->s_db_per_group) +
989 /* Inode bitmap, block bitmap, and inode table: */
990 fs->s_groups_count * (1 + 1 + fs->s_itb_per_group);
992 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
993 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
994 sbp->f_blocks = es->s_blocks_count - overhead;
995 sbp->f_bfree = es->s_free_blocks_count;
996 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
997 sbp->f_files = es->s_inodes_count;
998 sbp->f_ffree = es->s_free_inodes_count;
999 if (sbp != &mp->mnt_stat) {
1000 sbp->f_type = mp->mnt_vfc->vfc_typenum;
1001 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
1002 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
1008 * Go through the disk queues to initiate sandbagged IO;
1009 * go through the inodes to write those that have been modified;
1010 * initiate the writing of the super block if it has been modified.
1012 * Note: we are always called with the filesystem marked `MPBUSY'.
1015 static int ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data);
1018 ext2_sync(struct mount *mp, int waitfor)
1020 struct ext2mount *ump = VFSTOEXT2(mp);
1021 struct ext2_sb_info *fs;
1022 struct scaninfo scaninfo;
1026 if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */
1027 kprintf("fs = %s\n", fs->fs_fsmnt);
1028 panic("ext2_sync: rofs mod");
1032 * Write back each (modified) inode.
1034 scaninfo.allerror = 0;
1035 scaninfo.rescan = 1;
1036 scaninfo.waitfor = waitfor;
1037 while (scaninfo.rescan) {
1038 scaninfo.rescan = 0;
1039 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT,
1040 NULL, ext2_sync_scan, &scaninfo);
1044 * Force stale file system control information to be flushed.
1046 if ((waitfor & MNT_LAZY) == 0) {
1047 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
1048 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, 0)) != 0)
1049 scaninfo.allerror = error;
1050 vn_unlock(ump->um_devvp);
1056 * Write back modified superblock.
1058 if (fs->s_dirt != 0) {
1060 fs->s_es->s_wtime = time_second;
1061 if ((error = ext2_sbupdate(ump, waitfor)) != 0)
1062 scaninfo.allerror = error;
1064 return (scaninfo.allerror);
1068 ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data)
1070 struct scaninfo *info = data;
1075 if (vp->v_type == VNON ||
1077 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
1078 (RB_EMPTY(&vp->v_rbdirty_tree) || (info->waitfor & MNT_LAZY)))) {
1081 if ((error = VOP_FSYNC(vp, info->waitfor, 0)) != 0)
1082 info->allerror = error;
1087 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
1088 * in from disk. If it is in core, wait for the lock bit to clear, then
1089 * return the inode locked. Detection and handling of mount points must be
1090 * done by the calling routine.
1093 ext2_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
1095 struct ext2_sb_info *fs;
1097 struct ext2mount *ump;
1104 ump = VFSTOEXT2(mp);
1107 if ((*vpp = ext2_ihashget(dev, ino)) != NULL)
1111 * Lock out the creation of new entries in the FFS hash table in
1112 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
1115 if (ext2fs_inode_hash_lock) {
1116 while (ext2fs_inode_hash_lock) {
1117 ext2fs_inode_hash_lock = -1;
1118 tsleep(&ext2fs_inode_hash_lock, 0, "e2vget", 0);
1122 ext2fs_inode_hash_lock = 1;
1125 * If this MALLOC() is performed after the getnewvnode()
1126 * it might block, leaving a vnode with a NULL v_data to be
1127 * found by ext2_sync() if a sync happens to fire right then,
1128 * which will cause a panic because ext2_sync() blindly
1129 * dereferences vp->v_data (as well it should).
1131 ip = kmalloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK);
1133 /* Allocate a new vnode/inode. */
1134 if ((error = getnewvnode(VT_EXT2FS, mp, &vp, 0, LK_CANRECURSE)) != 0) {
1135 if (ext2fs_inode_hash_lock < 0)
1136 wakeup(&ext2fs_inode_hash_lock);
1137 ext2fs_inode_hash_lock = 0;
1139 kfree(ip, M_EXT2NODE);
1142 bzero((caddr_t)ip, sizeof(struct inode));
1145 ip->i_e2fs = fs = ump->um_e2fs;
1149 for (i = 0; i < MAXQUOTAS; i++)
1150 ip->i_dquot[i] = NODQUOT;
1153 * Put it onto its hash chain. Since our vnode is locked, other
1154 * requests for this inode will block if they arrive while we are
1155 * sleeping waiting for old data structures to be purged or for the
1156 * contents of the disk portion of this inode to be read.
1160 if (ext2fs_inode_hash_lock < 0)
1161 wakeup(&ext2fs_inode_hash_lock);
1162 ext2fs_inode_hash_lock = 0;
1164 /* Read in the disk contents for the inode, copy into the inode. */
1166 kprintf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
1168 error = bread(ump->um_devvp, fsbtodoff(fs, ino_to_fsba(fs, ino)),
1169 (int)fs->s_blocksize, &bp);
1172 * The inode does not contain anything useful, so it would
1173 * be misleading to leave it on its hash chain. With mode
1174 * still zero, it will be unlinked and returned to the free
1182 /* convert ext2 inode to dinode */
1183 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
1184 ino_to_fsbo(fs, ino)), &ip->i_din);
1185 ip->i_block_group = ino_to_cg(fs, ino);
1186 ip->i_next_alloc_block = 0;
1187 ip->i_next_alloc_goal = 0;
1188 ip->i_prealloc_count = 0;
1189 ip->i_prealloc_block = 0;
1190 /* now we want to make sure that block pointers for unused
1191 blocks are zeroed out - ext2_balloc depends on this
1192 although for regular files and directories only
1194 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
1195 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
1196 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1200 ext2_print_inode(ip);
1205 * Initialize the vnode from the inode, check for aliases.
1206 * Note that the underlying vnode may have changed.
1208 if ((error = ext2_vinit(mp, &vp)) != 0) {
1215 * Finish inode initialization now that aliasing has been resolved.
1217 ip->i_devvp = ump->um_devvp;
1220 * Set up a generation number for this inode if it does not
1221 * already have one. This should only happen on old filesystems.
1223 if (ip->i_gen == 0) {
1224 ip->i_gen = krandom() / 2 + 1;
1225 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1226 ip->i_flag |= IN_MODIFIED;
1229 * Return the locked and refd vnode.
1236 * File handle to vnode
1238 * Have to be really careful about stale file handles:
1239 * - check that the inode number is valid
1240 * - call ext2_vget() to get the locked inode
1241 * - check for an unallocated inode (i_mode == 0)
1242 * - check that the given client host has export rights and return
1243 * those rights via. exflagsp and credanonp
1246 ext2_fhtovp(struct mount *mp, struct vnode *rootvp,
1247 struct fid *fhp, struct vnode **vpp)
1250 struct ext2_sb_info *fs;
1255 ufhp = (struct ufid *)fhp;
1256 fs = VFSTOEXT2(mp)->um_e2fs;
1257 if (ufhp->ufid_ino < EXT2_ROOTINO ||
1258 ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group)
1261 error = VFS_VGET(mp, rootvp, ufhp->ufid_ino, &nvp);
1267 if (ip->i_mode == 0 ||
1268 ip->i_gen != ufhp->ufid_gen ||
1269 (VFSTOEXT2(mp)->um_i_effnlink_valid ? ip->i_effnlink :
1270 ip->i_nlink) <= 0) {
1280 * Vnode pointer to File handle
1284 ext2_vptofh(struct vnode *vp, struct fid *fhp)
1290 ufhp = (struct ufid *)fhp;
1291 ufhp->ufid_len = sizeof(struct ufid);
1292 ufhp->ufid_ino = ip->i_number;
1293 ufhp->ufid_gen = ip->i_gen;
1298 * This is the generic part of fhtovp called after the underlying
1299 * filesystem has validated the file handle.
1301 * Verify that a host should have access to a filesystem.
1304 ext2_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp,
1305 struct ucred **credanonp)
1308 struct ext2mount *ump;
1310 ump = VFSTOEXT2(mp);
1312 * Get the export permission structure for this <mp, client> tuple.
1314 np = vfs_export_lookup(mp, &ump->um_export, nam);
1318 *exflagsp = np->netc_exflags;
1319 *credanonp = &np->netc_anon;
1324 * Write a superblock and associated information back to disk.
1327 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1329 struct ext2_sb_info *fs = mp->um_e2fs;
1330 struct ext2_super_block *es = fs->s_es;
1334 kprintf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1336 bp = getblk(mp->um_devvp, SBOFF, SBSIZE, 0, 0);
1337 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1338 if (waitfor == MNT_WAIT)
1344 * The buffers for group descriptors, inode bitmaps and block bitmaps
1345 * are not busy at this point and are (hopefully) written by the
1346 * usual sync mechanism. No need to write them here