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
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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 $
41 * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_vfsops.c,v 1.57 2008/09/17 21:44:21 dillon Exp $
44 #include "opt_quota.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/nlookup.h>
51 #include <sys/kernel.h>
52 #include <sys/vnode.h>
53 #include <sys/mount.h>
56 #include <sys/fcntl.h>
57 #include <sys/diskslice.h>
58 #include <sys/malloc.h>
60 #include <vm/vm_zone.h>
63 #include <sys/thread2.h>
68 #include "ext2mount.h"
69 #include "ext2_extern.h"
73 #include "ext2_fs_sb.h"
75 extern struct vop_ops ext2_vnode_vops;
76 extern struct vop_ops ext2_spec_vops;
77 extern struct vop_ops ext2_fifo_vops;
79 static int ext2_fhtovp (struct mount *, struct vnode *,
80 struct fid *, struct vnode **);
81 static int ext2_flushfiles (struct mount *mp, int flags);
82 static int ext2_mount (struct mount *, char *, caddr_t, struct ucred *);
83 static int ext2_mountfs (struct vnode *, struct mount *, struct ucred *);
84 static int ext2_root(struct mount *, struct vnode **);
85 static int ext2_reload (struct mount *mountp, struct ucred *cred);
86 static int ext2_sbupdate (struct ext2mount *, int);
87 static int ext2_statfs (struct mount *, struct statfs *, struct ucred *);
88 static int ext2_sync (struct mount *, int);
89 static int ext2_unmount (struct mount *, int);
90 static int ext2_vget (struct mount *, struct vnode *, ino_t, struct vnode **);
91 static int ext2_init(struct vfsconf *);
92 static int ext2_vptofh (struct vnode *, struct fid *);
94 static MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part");
95 MALLOC_DEFINE(M_EXT2MNT, "EXT2 mount", "EXT2 mount structure");
97 static struct vfsops ext2fs_vfsops = {
98 .vfs_mount = ext2_mount,
99 .vfs_unmount = ext2_unmount,
100 .vfs_root = ext2_root, /* root inode via vget */
101 .vfs_quotactl = ext2_quotactl, /* quota operations */
102 .vfs_statfs = ext2_statfs,
103 .vfs_sync = ext2_sync,
104 .vfs_vget = ext2_vget,
105 .vfs_fhtovp = ext2_fhtovp,
106 .vfs_checkexp = ext2_check_export,
107 .vfs_vptofh = ext2_vptofh,
108 .vfs_init = ext2_init,
109 .vfs_uninit = ext2_uninit
112 VFS_SET(ext2fs_vfsops, ext2fs, 0);
113 #define bsd_malloc kmalloc
114 #define bsd_free kfree
116 static int ext2fs_inode_hash_lock;
118 static int ext2_check_sb_compat (struct ext2_super_block *es,
119 cdev_t dev, int ronly);
120 static int compute_sb_data (struct vnode * devvp,
121 struct ext2_super_block * es,
122 struct ext2_sb_info * fs);
125 ext2_root(struct mount *mp, struct vnode **vpp)
130 error = VFS_VGET(mp, NULL, (ino_t)ROOTINO, &nvp);
138 * Do operations associated with quotas
141 ext2_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
147 int cmd, type, error;
149 type = cmds & SUBCMDMASK;
150 cmd = cmds >> SUBCMDSHIFT;
171 error = priv_check_cred(cred, PRIV_UFS_QUOTAON, 0);
175 error = priv_check_cred(cred, PRIV_UFS_QUOTAOFF, 0);
179 error = priv_check_cred(cred, PRIV_VFS_SETQUOTA, 0);
183 error = priv_check_cred(cred, PRIV_UFS_SETUSE, 0);
187 if (uid == cred->cr_ruid)
190 error = priv_check_cred(cred, PRIV_VFS_GETQUOTA, 0);
206 if ((uint)type >= MAXQUOTAS)
208 if (vfs_busy(mp, LK_NOWAIT))
214 error = ext2_quotaon(cred, mp, type, arg);
218 error = ext2_quotaoff(mp, type);
222 error = ext2_setquota(mp, uid, type, arg);
226 error = ext2_setuse(mp, uid, type, arg);
230 error = ext2_getquota(mp, uid, type, arg);
234 error = ext2_qsync(mp);
247 * Initial UFS filesystems, done only once.
250 ext2_init(struct vfsconf *vfsp)
270 * data: this is actually a (struct ext2_args *)
273 ext2_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
276 struct ext2_args args;
277 struct ext2mount *ump = 0;
278 struct ext2_sb_info *fs;
282 struct nlookupdata nd;
284 if ((error = copyin(data, (caddr_t)&args, sizeof (struct ext2_args))) != 0)
288 * If updating, check whether changing from read-only to
289 * read/write; if there is no device name, that's all we do.
291 if (mp->mnt_flag & MNT_UPDATE) {
294 devvp = ump->um_devvp;
296 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
298 if (mp->mnt_flag & MNT_FORCE)
300 if (vfs_busy(mp, LK_NOWAIT))
302 error = ext2_flushfiles(mp, flags);
304 if (!error && fs->s_wasvalid) {
305 fs->s_es->s_state |= EXT2_VALID_FS;
306 ext2_sbupdate(ump, MNT_WAIT);
309 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
310 VOP_OPEN(devvp, FREAD, FSCRED, NULL);
311 VOP_CLOSE(devvp, FREAD|FWRITE);
314 if (!error && (mp->mnt_flag & MNT_RELOAD))
315 error = ext2_reload(mp, cred);
318 if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev,
319 (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0)
321 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
323 * If upgrade to read-write by non-root, then verify
324 * that user has necessary permissions on the device.
326 if (cred->cr_uid != 0) {
327 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
328 error = VOP_ACCESS(devvp, VREAD | VWRITE, cred);
336 if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 ||
337 (fs->s_es->s_state & EXT2_ERROR_FS)) {
338 if (mp->mnt_flag & MNT_FORCE) {
340 "WARNING: %s was not properly dismounted\n",
344 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
349 fs->s_es->s_state &= ~EXT2_VALID_FS;
350 ext2_sbupdate(ump, MNT_WAIT);
352 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
353 VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL);
354 VOP_CLOSE(devvp, FREAD);
357 if (args.fspec == 0) {
359 * Process export requests.
361 return (vfs_export(mp, &ump->um_export, &args.export));
365 * Not an update, or updating the name: look up the name
366 * and verify that it refers to a sensible block device.
369 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
371 error = nlookup(&nd);
373 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
378 if (!vn_isdisk(devvp, &error)) {
384 * If mount by non-root, then verify that user has necessary
385 * permissions on the device.
387 if (cred->cr_uid != 0) {
389 if ((mp->mnt_flag & MNT_RDONLY) == 0)
390 accessmode |= VWRITE;
391 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
392 if ((error = VOP_ACCESS(devvp, accessmode, cred)) != 0) {
399 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
400 error = ext2_mountfs(devvp, mp, cred);
402 if (devvp != ump->um_devvp)
403 error = EINVAL; /* needs translation */
413 copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
414 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
415 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
416 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
417 ext2_statfs(mp, &mp->mnt_stat, cred);
422 * checks that the data in the descriptor blocks make sense
423 * this is taken from ext2/super.c
426 ext2_check_descriptors(struct ext2_sb_info *sb)
430 unsigned long block = sb->s_es->s_first_data_block;
431 struct ext2_group_desc * gdp = NULL;
433 /* ext2_debug ("Checking group descriptors"); */
435 for (i = 0; i < sb->s_groups_count; i++)
437 /* examine next descriptor block */
438 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
439 gdp = (struct ext2_group_desc *)
440 sb->s_group_desc[desc_block++]->b_data;
441 if (gdp->bg_block_bitmap < block ||
442 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
444 kprintf ("ext2_check_descriptors: "
445 "Block bitmap for group %d"
446 " not in group (block %lu)!\n",
447 i, (unsigned long) gdp->bg_block_bitmap);
450 if (gdp->bg_inode_bitmap < block ||
451 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
453 kprintf ("ext2_check_descriptors: "
454 "Inode bitmap for group %d"
455 " not in group (block %lu)!\n",
456 i, (unsigned long) gdp->bg_inode_bitmap);
459 if (gdp->bg_inode_table < block ||
460 gdp->bg_inode_table + sb->s_itb_per_group >=
461 block + EXT2_BLOCKS_PER_GROUP(sb))
463 kprintf ("ext2_check_descriptors: "
464 "Inode table for group %d"
465 " not in group (block %lu)!\n",
466 i, (unsigned long) gdp->bg_inode_table);
469 block += EXT2_BLOCKS_PER_GROUP(sb);
476 ext2_check_sb_compat(struct ext2_super_block *es, cdev_t dev, int ronly)
478 if (es->s_magic != EXT2_SUPER_MAGIC) {
479 kprintf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
480 devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC);
483 if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
484 if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
486 "WARNING: mount of %s denied due to unsupported optional features\n",
491 (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
493 "WARNING: R/W mount of %s denied due to unsupported optional features\n",
502 * this computes the fields of the ext2_sb_info structure from the
503 * data in the ext2_super_block structure read in
506 compute_sb_data(struct vnode *devvp, struct ext2_super_block *es,
507 struct ext2_sb_info *fs)
511 int logic_sb_block = 1; /* XXX for now */
516 #define V(v) kprintf(#v"= %d\n", fs->v);
519 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
521 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
523 fs->s_fsbtodb = es->s_log_block_size + 1;
525 fs->s_qbmask = fs->s_blocksize - 1;
527 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
529 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
532 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
534 fs->s_blocks_per_group = es->s_blocks_per_group;
535 V(s_blocks_per_group)
536 fs->s_frags_per_group = es->s_frags_per_group;
538 fs->s_inodes_per_group = es->s_inodes_per_group;
539 V(s_inodes_per_group)
540 if (es->s_rev_level == EXT2_GOOD_OLD_REV) {
541 fs->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
542 fs->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
544 fs->s_first_ino = es->s_first_ino;
545 fs->s_inode_size = es->s_inode_size;
547 * Simple sanity check for superblock inode size value.
549 if (fs->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE ||
550 fs->s_inode_size > fs->s_blocksize ||
551 (fs->s_inode_size & (fs->s_inode_size - 1)) != 0) {
552 kprintf("EXT2-fs: invalid inode size %d\n",
559 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE(fs);
560 V(s_inodes_per_block)
561 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
563 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
565 /* s_resuid / s_resgid ? */
566 fs->s_groups_count = (es->s_blocks_count -
567 es->s_first_data_block +
568 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
569 EXT2_BLOCKS_PER_GROUP(fs);
571 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
572 EXT2_DESC_PER_BLOCK(fs);
573 fs->s_db_per_group = db_count;
576 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
577 M_EXT2MNT, M_WAITOK);
579 /* adjust logic_sb_block */
580 if(fs->s_blocksize > SBSIZE)
581 /* Godmar thinks: if the blocksize is greater than 1024, then
582 the superblock is logically part of block zero.
586 for (i = 0; i < db_count; i++) {
587 error = bread(devvp, fsbtodoff(fs, logic_sb_block + i + 1),
588 fs->s_blocksize, &fs->s_group_desc[i]);
590 for (j = 0; j < i; j++)
591 brelse(fs->s_group_desc[j]);
592 bsd_free(fs->s_group_desc, M_EXT2MNT);
593 kprintf("EXT2-fs: unable to read group descriptors (%d)\n", error);
596 /* Set the B_LOCKED flag on the buffer, then brelse() it */
597 LCK_BUF(fs->s_group_desc[i])
599 if(!ext2_check_descriptors(fs)) {
600 for (j = 0; j < db_count; j++)
601 ULCK_BUF(fs->s_group_desc[j])
602 bsd_free(fs->s_group_desc, M_EXT2MNT);
603 kprintf("EXT2-fs: (ext2_check_descriptors failure) "
604 "unable to read group descriptors\n");
608 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
609 fs->s_inode_bitmap_number[i] = 0;
610 fs->s_inode_bitmap[i] = NULL;
611 fs->s_block_bitmap_number[i] = 0;
612 fs->s_block_bitmap[i] = NULL;
614 fs->s_loaded_inode_bitmaps = 0;
615 fs->s_loaded_block_bitmaps = 0;
620 * Reload all incore data for a filesystem (used after running fsck on
621 * the root filesystem and finding things to fix). The filesystem must
622 * be mounted read-only.
624 * Things to do to update the mount:
625 * 1) invalidate all cached meta-data.
626 * 2) re-read superblock from disk.
627 * 3) re-read summary information from disk.
628 * 4) invalidate all inactive vnodes.
629 * 5) invalidate all cached file data.
630 * 6) re-read inode data for all active vnodes.
632 static int ext2_reload_scan1(struct mount *mp, struct vnode *vp, void *rescan);
633 static int ext2_reload_scan2(struct mount *mp, struct vnode *vp, void *rescan);
640 struct ext2_sb_info *fs;
644 ext2_reload(struct mount *mountp, struct ucred *cred)
648 struct ext2_super_block * es;
649 struct ext2_sb_info *fs;
651 struct scaninfo scaninfo;
653 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
656 * Step 1: invalidate all cached meta-data.
658 devvp = VFSTOEXT2(mountp)->um_devvp;
659 if (vinvalbuf(devvp, 0, 0, 0))
660 panic("ext2_reload: dirty1");
662 * Step 2: re-read superblock from disk.
663 * constants have been adjusted for ext2
665 if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
667 es = (struct ext2_super_block *)bp->b_data;
668 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
670 return (EIO); /* XXX needs translation */
672 fs = VFSTOEXT2(mountp)->um_e2fs;
673 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
675 if((error = compute_sb_data(devvp, es, fs)) != 0) {
680 if (fs->fs_sbsize < SBSIZE)
681 bp->b_flags |= B_INVAL;
686 scaninfo.devvp = devvp;
688 while (error == 0 && scaninfo.rescan) {
690 error = vmntvnodescan(mountp, VMSC_GETVX, ext2_reload_scan1,
691 ext2_reload_scan2, &scaninfo);
697 ext2_reload_scan1(struct mount *mp, struct vnode *vp, void *data)
699 /*struct scaninfo *info = data;*/
705 ext2_reload_scan2(struct mount *mp, struct vnode *vp, void *data)
707 struct scaninfo *info = data;
719 * Step 5: invalidate all cached file data.
721 if (vinvalbuf(vp, 0, 0, 0))
722 panic("ext2_reload: dirty2");
724 * Step 6: re-read inode data for all active vnodes.
727 error = bread(info->devvp,
728 fsbtodoff(info->fs, ino_to_fsba(info->fs, ip->i_number)),
729 (int)info->fs->s_blocksize, &bp);
732 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
733 EXT2_INODE_SIZE(info->fs) * ino_to_fsbo(info->fs, ip->i_number)),
740 * Common code for mount and mountroot
743 ext2_mountfs(struct vnode *devvp, struct mount *mp, struct ucred *cred)
745 struct ext2mount *ump;
747 struct ext2_sb_info *fs;
748 struct ext2_super_block * es;
750 struct partinfo dpart;
755 * Disallow multiple mounts of the same device.
756 * Disallow mounting of a device that is currently in use
757 * (except for root, which might share swap device for miniroot).
758 * Flush out any old buffers remaining from a previous use.
760 if ((error = vfs_mountedon(devvp)) != 0)
762 if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0)
764 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)) != 0)
767 /* turn on this to force it to be read-only */
768 mp->mnt_flag |= MNT_RDONLY;
771 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
772 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
773 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL);
778 if (dev->si_iosize_max != 0)
779 mp->mnt_iosize_max = dev->si_iosize_max;
780 if (mp->mnt_iosize_max > MAXPHYS)
781 mp->mnt_iosize_max = MAXPHYS;
782 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred) != 0) {
785 size = dpart.media_blksize;
790 if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
792 es = (struct ext2_super_block *)bp->b_data;
793 if (ext2_check_sb_compat(es, dev, ronly) != 0) {
794 error = EINVAL; /* XXX needs translation */
797 if ((es->s_state & EXT2_VALID_FS) == 0 ||
798 (es->s_state & EXT2_ERROR_FS)) {
799 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
801 "WARNING: Filesystem was not properly dismounted\n");
804 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
809 ump = bsd_malloc(sizeof *ump, M_EXT2MNT, M_WAITOK | M_ZERO);
810 ump->um_malloctype = M_EXT2NODE;
811 ump->um_blkatoff = ext2_blkatoff;
812 ump->um_truncate = ext2_truncate;
813 ump->um_update = ext2_update;
814 ump->um_valloc = ext2_valloc;
815 ump->um_vfree = ext2_vfree;
816 /* I don't know whether this is the right strategy. Note that
817 we dynamically allocate both a ext2_sb_info and a ext2_super_block
818 while Linux keeps the super block in a locked buffer
820 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
821 M_EXT2MNT, M_WAITOK);
822 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
823 M_EXT2MNT, M_WAITOK);
824 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
825 if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)))
828 * We don't free the group descriptors allocated by compute_sb_data()
829 * until ext2_unmount(). This is OK since the mount will succeed.
834 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
835 /* if the fs is not mounted read-only, make sure the super block is
836 always written back on a sync()
838 fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0;
840 fs->s_dirt = 1; /* mark it modified */
841 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
843 mp->mnt_data = (qaddr_t)ump;
844 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
845 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
846 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
847 mp->mnt_flag |= MNT_LOCAL;
850 ump->um_devvp = devvp;
851 /* setting those two parameters allows us to use
852 ext2_bmap w/o changse !
854 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
855 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
856 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
857 for (i = 0; i < MAXQUOTAS; i++)
858 ump->um_quotas[i] = NULLVP;
859 dev->si_mountpoint = mp;
861 vfs_add_vnodeops(mp, &ext2_vnode_vops, &mp->mnt_vn_norm_ops);
862 vfs_add_vnodeops(mp, &ext2_spec_vops, &mp->mnt_vn_spec_ops);
863 vfs_add_vnodeops(mp, &ext2_fifo_vops, &mp->mnt_vn_fifo_ops);
866 ext2_sbupdate(ump, MNT_WAIT);
871 VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE);
873 bsd_free(ump->um_e2fs->s_es, M_EXT2MNT);
874 bsd_free(ump->um_e2fs, M_EXT2MNT);
875 bsd_free(ump, M_EXT2MNT);
876 mp->mnt_data = (qaddr_t)0;
882 * unmount system call
885 ext2_unmount(struct mount *mp, int mntflags)
887 struct ext2mount *ump;
888 struct ext2_sb_info *fs;
889 int error, flags, ronly, i;
892 if (mntflags & MNT_FORCE) {
893 if (mp->mnt_flag & MNT_ROOTFS)
897 if ((error = ext2_flushfiles(mp, flags)) != 0)
901 ronly = fs->s_rd_only;
904 fs->s_es->s_state |= EXT2_VALID_FS;
905 ext2_sbupdate(ump, MNT_WAIT);
908 /* release buffers containing group descriptors */
909 for(i = 0; i < fs->s_db_per_group; i++)
910 ULCK_BUF(fs->s_group_desc[i])
911 bsd_free(fs->s_group_desc, M_EXT2MNT);
913 /* release cached inode/block bitmaps */
914 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
915 if (fs->s_inode_bitmap[i])
916 ULCK_BUF(fs->s_inode_bitmap[i])
918 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
919 if (fs->s_block_bitmap[i])
920 ULCK_BUF(fs->s_block_bitmap[i])
922 ump->um_devvp->v_rdev->si_mountpoint = NULL;
923 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE);
924 vrele(ump->um_devvp);
925 bsd_free(fs->s_es, M_EXT2MNT);
926 bsd_free(fs, M_EXT2MNT);
927 bsd_free(ump, M_EXT2MNT);
928 mp->mnt_data = (qaddr_t)0;
929 mp->mnt_flag &= ~MNT_LOCAL;
934 * Flush out all the files in a filesystem.
937 ext2_flushfiles(struct mount *mp, int flags)
939 struct ext2mount *ump;
947 if (mp->mnt_flag & MNT_QUOTA) {
948 if ((error = vflush(mp, 0, SKIPSYSTEM|flags)) != 0)
950 for (i = 0; i < MAXQUOTAS; i++) {
951 if (ump->um_quotas[i] == NULLVP)
953 ext2_quotaoff(mp, i);
956 * Here we fall through to vflush again to ensure
957 * that we have gotten rid of all the system vnodes.
961 error = vflush(mp, 0, flags);
966 * Get file system statistics.
967 * taken from ext2/super.c ext2_statfs
970 ext2_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
972 unsigned long overhead;
973 struct ext2mount *ump;
974 struct ext2_sb_info *fs;
975 struct ext2_super_block *es;
982 if (es->s_magic != EXT2_SUPER_MAGIC)
983 panic("ext2_statfs - magic number spoiled");
986 * Compute the overhead (FS structures)
988 if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) {
990 for (i = 0 ; i < fs->s_groups_count; i++)
991 if (ext2_group_sparse(i))
994 nsb = fs->s_groups_count;
995 overhead = es->s_first_data_block +
996 /* Superblocks and block group descriptors: */
997 nsb * (1 + fs->s_db_per_group) +
998 /* Inode bitmap, block bitmap, and inode table: */
999 fs->s_groups_count * (1 + 1 + fs->s_itb_per_group);
1001 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
1002 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
1003 sbp->f_blocks = es->s_blocks_count - overhead;
1004 sbp->f_bfree = es->s_free_blocks_count;
1005 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
1006 sbp->f_files = es->s_inodes_count;
1007 sbp->f_ffree = es->s_free_inodes_count;
1008 if (sbp != &mp->mnt_stat) {
1009 sbp->f_type = mp->mnt_vfc->vfc_typenum;
1010 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
1011 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
1017 * Go through the disk queues to initiate sandbagged IO;
1018 * go through the inodes to write those that have been modified;
1019 * initiate the writing of the super block if it has been modified.
1021 * Note: we are always called with the filesystem marked `MPBUSY'.
1024 static int ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data);
1027 ext2_sync(struct mount *mp, int waitfor)
1029 struct ext2mount *ump = VFSTOEXT2(mp);
1030 struct ext2_sb_info *fs;
1031 struct scaninfo scaninfo;
1035 if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */
1036 kprintf("fs = %s\n", fs->fs_fsmnt);
1037 panic("ext2_sync: rofs mod");
1041 * Write back each (modified) inode.
1043 scaninfo.allerror = 0;
1044 scaninfo.rescan = 1;
1045 scaninfo.waitfor = waitfor;
1046 while (scaninfo.rescan) {
1047 scaninfo.rescan = 0;
1048 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT,
1049 NULL, ext2_sync_scan, &scaninfo);
1053 * Force stale file system control information to be flushed.
1055 if (waitfor != MNT_LAZY) {
1056 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
1057 if ((error = VOP_FSYNC(ump->um_devvp, waitfor)) != 0)
1058 scaninfo.allerror = error;
1059 vn_unlock(ump->um_devvp);
1065 * Write back modified superblock.
1067 if (fs->s_dirt != 0) {
1069 fs->s_es->s_wtime = time_second;
1070 if ((error = ext2_sbupdate(ump, waitfor)) != 0)
1071 scaninfo.allerror = error;
1073 return (scaninfo.allerror);
1077 ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data)
1079 struct scaninfo *info = data;
1084 if (vp->v_type == VNON ||
1086 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
1087 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) {
1090 if ((error = VOP_FSYNC(vp, info->waitfor)) != 0)
1091 info->allerror = error;
1096 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
1097 * in from disk. If it is in core, wait for the lock bit to clear, then
1098 * return the inode locked. Detection and handling of mount points must be
1099 * done by the calling routine.
1102 ext2_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
1104 struct ext2_sb_info *fs;
1106 struct ext2mount *ump;
1113 ump = VFSTOEXT2(mp);
1116 if ((*vpp = ext2_ihashget(dev, ino)) != NULL)
1120 * Lock out the creation of new entries in the FFS hash table in
1121 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
1124 if (ext2fs_inode_hash_lock) {
1125 while (ext2fs_inode_hash_lock) {
1126 ext2fs_inode_hash_lock = -1;
1127 tsleep(&ext2fs_inode_hash_lock, 0, "e2vget", 0);
1131 ext2fs_inode_hash_lock = 1;
1134 * If this MALLOC() is performed after the getnewvnode()
1135 * it might block, leaving a vnode with a NULL v_data to be
1136 * found by ext2_sync() if a sync happens to fire right then,
1137 * which will cause a panic because ext2_sync() blindly
1138 * dereferences vp->v_data (as well it should).
1140 MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK);
1142 /* Allocate a new vnode/inode. */
1143 if ((error = getnewvnode(VT_EXT2FS, mp, &vp, 0, LK_CANRECURSE)) != 0) {
1144 if (ext2fs_inode_hash_lock < 0)
1145 wakeup(&ext2fs_inode_hash_lock);
1146 ext2fs_inode_hash_lock = 0;
1148 FREE(ip, M_EXT2NODE);
1151 bzero((caddr_t)ip, sizeof(struct inode));
1154 ip->i_e2fs = fs = ump->um_e2fs;
1158 for (i = 0; i < MAXQUOTAS; i++)
1159 ip->i_dquot[i] = NODQUOT;
1162 * Put it onto its hash chain. Since our vnode is locked, other
1163 * requests for this inode will block if they arrive while we are
1164 * sleeping waiting for old data structures to be purged or for the
1165 * contents of the disk portion of this inode to be read.
1169 if (ext2fs_inode_hash_lock < 0)
1170 wakeup(&ext2fs_inode_hash_lock);
1171 ext2fs_inode_hash_lock = 0;
1173 /* Read in the disk contents for the inode, copy into the inode. */
1175 kprintf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
1177 error = bread(ump->um_devvp, fsbtodoff(fs, ino_to_fsba(fs, ino)),
1178 (int)fs->s_blocksize, &bp);
1181 * The inode does not contain anything useful, so it would
1182 * be misleading to leave it on its hash chain. With mode
1183 * still zero, it will be unlinked and returned to the free
1191 /* convert ext2 inode to dinode */
1192 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
1193 ino_to_fsbo(fs, ino)), &ip->i_din);
1194 ip->i_block_group = ino_to_cg(fs, ino);
1195 ip->i_next_alloc_block = 0;
1196 ip->i_next_alloc_goal = 0;
1197 ip->i_prealloc_count = 0;
1198 ip->i_prealloc_block = 0;
1199 /* now we want to make sure that block pointers for unused
1200 blocks are zeroed out - ext2_balloc depends on this
1201 although for regular files and directories only
1203 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
1204 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
1205 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1209 ext2_print_inode(ip);
1214 * Initialize the vnode from the inode, check for aliases.
1215 * Note that the underlying vnode may have changed.
1217 if ((error = ext2_vinit(mp, &vp)) != 0) {
1224 * Finish inode initialization now that aliasing has been resolved.
1226 ip->i_devvp = ump->um_devvp;
1229 * Set up a generation number for this inode if it does not
1230 * already have one. This should only happen on old filesystems.
1232 if (ip->i_gen == 0) {
1233 ip->i_gen = krandom() / 2 + 1;
1234 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1235 ip->i_flag |= IN_MODIFIED;
1238 * Return the locked and refd vnode.
1245 * File handle to vnode
1247 * Have to be really careful about stale file handles:
1248 * - check that the inode number is valid
1249 * - call ext2_vget() to get the locked inode
1250 * - check for an unallocated inode (i_mode == 0)
1251 * - check that the given client host has export rights and return
1252 * those rights via. exflagsp and credanonp
1255 ext2_fhtovp(struct mount *mp, struct vnode *rootvp,
1256 struct fid *fhp, struct vnode **vpp)
1259 struct ext2_sb_info *fs;
1264 ufhp = (struct ufid *)fhp;
1265 fs = VFSTOEXT2(mp)->um_e2fs;
1266 if (ufhp->ufid_ino < ROOTINO ||
1267 ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group)
1270 error = VFS_VGET(mp, rootvp, ufhp->ufid_ino, &nvp);
1276 if (ip->i_mode == 0 ||
1277 ip->i_gen != ufhp->ufid_gen ||
1278 (VFSTOEXT2(mp)->um_i_effnlink_valid ? ip->i_effnlink :
1279 ip->i_nlink) <= 0) {
1289 * Vnode pointer to File handle
1293 ext2_vptofh(struct vnode *vp, struct fid *fhp)
1299 ufhp = (struct ufid *)fhp;
1300 ufhp->ufid_len = sizeof(struct ufid);
1301 ufhp->ufid_ino = ip->i_number;
1302 ufhp->ufid_gen = ip->i_gen;
1307 * This is the generic part of fhtovp called after the underlying
1308 * filesystem has validated the file handle.
1310 * Verify that a host should have access to a filesystem.
1313 ext2_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp,
1314 struct ucred **credanonp)
1317 struct ext2mount *ump;
1319 ump = VFSTOEXT2(mp);
1321 * Get the export permission structure for this <mp, client> tuple.
1323 np = vfs_export_lookup(mp, &ump->um_export, nam);
1327 *exflagsp = np->netc_exflags;
1328 *credanonp = &np->netc_anon;
1333 * Write a superblock and associated information back to disk.
1336 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1338 struct ext2_sb_info *fs = mp->um_e2fs;
1339 struct ext2_super_block *es = fs->s_es;
1343 kprintf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1345 bp = getblk(mp->um_devvp, SBOFF, SBSIZE, 0, 0);
1346 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1347 if (waitfor == MNT_WAIT)
1353 * The buffers for group descriptors, inode bitmaps and block bitmaps
1354 * are not busy at this point and are (hopefully) written by the
1355 * usual sync mechanism. No need to write them here