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 * 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.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
42 #if !defined(__FreeBSD__)
45 #include "opt_quota.h"
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/namei.h>
52 #include <sys/kernel.h>
53 #include <sys/vnode.h>
54 #include <sys/mount.h>
56 #include <sys/fcntl.h>
57 #include <sys/disklabel.h>
58 #include <sys/malloc.h>
61 #include <miscfs/specfs/specdev.h>
63 #include <ufs/ufs/quota.h>
64 #include <ufs/ufs/ufsmount.h>
65 #include <ufs/ufs/inode.h>
66 #include <ufs/ufs/ufs_extern.h>
68 #include <gnu/ext2fs/fs.h>
69 #include <gnu/ext2fs/ext2_extern.h>
70 #include <gnu/ext2fs/ext2_fs.h>
71 #include <gnu/ext2fs/ext2_fs_sb.h>
73 static int ext2_fhtovp __P((struct mount *, struct fid *, struct mbuf *,
74 struct vnode **, int *, struct ucred **));
75 static int ext2_flushfiles __P((struct mount *mp, int flags, struct proc *p));
76 static int ext2_mount __P((struct mount *,
77 char *, caddr_t, struct nameidata *, struct proc *));
78 static int ext2_mountfs __P((struct vnode *, struct mount *, struct proc *));
79 static int ext2_reload __P((struct mount *mountp, struct ucred *cred,
81 static int ext2_sbupdate __P((struct ufsmount *, int));
82 static int ext2_statfs __P((struct mount *, struct statfs *, struct proc *));
83 static int ext2_sync __P((struct mount *, int, struct ucred *, struct proc *));
84 static int ext2_unmount __P((struct mount *, int, struct proc *));
85 static int ext2_vget __P((struct mount *, ino_t, struct vnode **));
86 static int ext2_vptofh __P((struct vnode *, struct fid *));
88 static struct vfsops ext2fs_vfsops = {
90 ufs_start, /* empty function */
92 ufs_root, /* root inode via vget */
93 ufs_quotactl, /* does operations associated with quotas */
102 #if defined(__FreeBSD__)
103 VFS_SET(ext2fs_vfsops, ext2fs, MOUNT_EXT2FS, 0);
104 #define bsd_malloc malloc
105 #define bsd_free free
108 extern u_long nextgennumber;
110 static int ext2fs_inode_hash_lock;
113 static int compute_sb_data __P((struct vnode * devvp,
114 struct ext2_super_block * es,
115 struct ext2_sb_info * fs));
118 static int ext2_mountroot __P((void));
121 * Called by main() when ext2fs is going to be mounted as root.
123 * Name is updated by mount(8) after booting.
125 #define ROOTNAME "root_device"
130 #if !defined(__FreeBSD__)
131 extern struct vnode *rootvp;
133 register struct ext2_sb_info *fs;
134 register struct mount *mp;
135 #if defined(__FreeBSD__)
136 struct proc *p = curproc;
138 struct proc *p = get_proc(); /* XXX */
140 struct ufsmount *ump;
145 * Get vnodes for swapdev and rootdev.
147 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
148 panic("ext2_mountroot: can't setup bdevvp's");
150 mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
151 bzero((char *)mp, (u_long)sizeof(struct mount));
152 mp->mnt_op = &ext2fs_vfsops;
153 mp->mnt_flag = MNT_RDONLY;
154 if (error = ext2_mountfs(rootvp, mp, p)) {
155 bsd_free(mp, M_MOUNT);
158 if (error = vfs_lock(mp)) {
159 (void)ext2_unmount(mp, 0, p);
160 bsd_free(mp, M_MOUNT);
163 #if defined(__FreeBSD__)
164 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
166 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
168 mp->mnt_flag |= MNT_ROOTFS;
169 mp->mnt_vnodecovered = NULLVP;
172 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
173 fs->fs_fsmnt[0] = '/';
174 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
176 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
178 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
179 (void)ext2_statfs(mp, &mp->mnt_stat, p);
181 inittodr(fs->s_es->s_wtime); /* this helps to set the time */
192 ext2_mount(mp, path, data, ndp, p)
193 register struct mount *mp;
195 caddr_t data; /* this is actually a (struct ufs_args *) */
196 struct nameidata *ndp;
200 struct ufs_args args;
201 struct ufsmount *ump = 0;
202 register struct ext2_sb_info *fs;
206 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
209 * If updating, check whether changing from read-only to
210 * read/write; if there is no device name, that's all we do.
212 if (mp->mnt_flag & MNT_UPDATE) {
216 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
218 if (mp->mnt_flag & MNT_FORCE)
220 if (vfs_busy(mp, LK_NOWAIT, 0, p))
222 error = ext2_flushfiles(mp, flags, p);
225 if (!error && (mp->mnt_flag & MNT_RELOAD))
226 error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p);
229 if (fs->s_rd_only && (mp->mnt_flag & MNT_WANTRDWR))
231 if (fs->s_rd_only == 0) {
232 /* don't say it's clean */
233 fs->s_es->s_state &= ~EXT2_VALID_FS;
234 ext2_sbupdate(ump, MNT_WAIT);
236 if (args.fspec == 0) {
238 * Process export requests.
240 return (vfs_export(mp, &ump->um_export, &args.export));
244 * Not an update, or updating the name: look up the name
245 * and verify that it refers to a sensible block device.
247 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
248 if (error = namei(ndp))
252 if (devvp->v_type != VBLK) {
256 if (major(devvp->v_rdev) >= nblkdev) {
260 if ((mp->mnt_flag & MNT_UPDATE) == 0)
261 error = ext2_mountfs(devvp, mp, p);
263 if (devvp != ump->um_devvp)
264 error = EINVAL; /* needs translation */
274 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
275 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
276 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
278 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
280 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
281 (void)ext2_statfs(mp, &mp->mnt_stat, p);
286 * checks that the data in the descriptor blocks make sense
287 * this is taken from ext2/super.c
289 static int ext2_check_descriptors (struct ext2_sb_info * sb)
293 unsigned long block = sb->s_es->s_first_data_block;
294 struct ext2_group_desc * gdp = NULL;
296 /* ext2_debug ("Checking group descriptors"); */
298 for (i = 0; i < sb->s_groups_count; i++)
300 /* examine next descriptor block */
301 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
302 gdp = (struct ext2_group_desc *)
303 sb->s_group_desc[desc_block++]->b_data;
304 if (gdp->bg_block_bitmap < block ||
305 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
307 printf ("ext2_check_descriptors: "
308 "Block bitmap for group %d"
309 " not in group (block %lu)!",
310 i, (unsigned long) gdp->bg_block_bitmap);
313 if (gdp->bg_inode_bitmap < block ||
314 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
316 printf ("ext2_check_descriptors: "
317 "Inode bitmap for group %d"
318 " not in group (block %lu)!",
319 i, (unsigned long) gdp->bg_inode_bitmap);
322 if (gdp->bg_inode_table < block ||
323 gdp->bg_inode_table + sb->s_itb_per_group >=
324 block + EXT2_BLOCKS_PER_GROUP(sb))
326 printf ("ext2_check_descriptors: "
327 "Inode table for group %d"
328 " not in group (block %lu)!",
329 i, (unsigned long) gdp->bg_inode_table);
332 block += EXT2_BLOCKS_PER_GROUP(sb);
339 * this computes the fields of the ext2_sb_info structure from the
340 * data in the ext2_super_block structure read in
342 static int compute_sb_data(devvp, es, fs)
343 struct vnode * devvp;
344 struct ext2_super_block * es;
345 struct ext2_sb_info * fs;
349 int logic_sb_block = 1; /* XXX for now */
354 #define V(v) printf(#v"= %d\n", fs->v);
357 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
359 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
361 fs->s_fsbtodb = es->s_log_block_size + 1;
363 fs->s_qbmask = fs->s_blocksize - 1;
365 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
367 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
370 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
372 fs->s_blocks_per_group = es->s_blocks_per_group;
373 V(s_blocks_per_group)
374 fs->s_frags_per_group = es->s_frags_per_group;
376 fs->s_inodes_per_group = es->s_inodes_per_group;
377 V(s_inodes_per_group)
378 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
379 V(s_inodes_per_block)
380 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
382 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
384 /* s_resuid / s_resgid ? */
385 fs->s_groups_count = (es->s_blocks_count -
386 es->s_first_data_block +
387 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
388 EXT2_BLOCKS_PER_GROUP(fs);
390 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
391 EXT2_DESC_PER_BLOCK(fs);
392 fs->s_db_per_group = db_count;
395 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
398 /* adjust logic_sb_block */
399 if(fs->s_blocksize > SBSIZE)
400 /* Godmar thinks: if the blocksize is greater than 1024, then
401 the superblock is logically part of block zero.
405 for (i = 0; i < db_count; i++) {
406 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
407 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]);
409 for (j = 0; j < i; j++)
410 brelse(fs->s_group_desc[j]);
411 bsd_free(fs->s_group_desc, M_UFSMNT);
412 printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
416 if(!ext2_check_descriptors(fs)) {
417 for (j = 0; j < db_count; j++)
418 brelse(fs->s_group_desc[j]);
419 bsd_free(fs->s_group_desc, M_UFSMNT);
420 printf("EXT2-fs: (ext2_check_descriptors failure) "
421 "unable to read group descriptors\n");
425 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
426 fs->s_inode_bitmap_number[i] = 0;
427 fs->s_inode_bitmap[i] = NULL;
428 fs->s_block_bitmap_number[i] = 0;
429 fs->s_block_bitmap[i] = NULL;
431 fs->s_loaded_inode_bitmaps = 0;
432 fs->s_loaded_block_bitmaps = 0;
437 * Reload all incore data for a filesystem (used after running fsck on
438 * the root filesystem and finding things to fix). The filesystem must
439 * be mounted read-only.
441 * Things to do to update the mount:
442 * 1) invalidate all cached meta-data.
443 * 2) re-read superblock from disk.
444 * 3) re-read summary information from disk.
445 * 4) invalidate all inactive vnodes.
446 * 5) invalidate all cached file data.
447 * 6) re-read inode data for all active vnodes.
450 ext2_reload(mountp, cred, p)
451 register struct mount *mountp;
455 register struct vnode *vp, *nvp, *devvp;
458 struct ext2_super_block * es;
459 struct ext2_sb_info *fs;
462 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
465 * Step 1: invalidate all cached meta-data.
467 devvp = VFSTOUFS(mountp)->um_devvp;
468 if (vinvalbuf(devvp, 0, cred, p, 0, 0))
469 panic("ext2_reload: dirty1");
471 * Step 2: re-read superblock from disk.
472 * constants have been adjusted for ext2
474 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
476 es = (struct ext2_super_block *)bp->b_data;
477 if (es->s_magic != EXT2_SUPER_MAGIC) {
478 if(es->s_magic == EXT2_PRE_02B_MAGIC)
479 printf("This filesystem bears the magic number of a pre "
480 "0.2b version of ext2. This is not supported by "
483 printf("Wrong magic number: %x (expected %x for ext2 fs\n",
484 es->s_magic, EXT2_SUPER_MAGIC);
486 return (EIO); /* XXX needs translation */
488 fs = VFSTOUFS(mountp)->um_e2fs;
489 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
491 if(error = compute_sb_data(devvp, es, fs)) {
496 if (fs->fs_sbsize < SBSIZE)
497 bp->b_flags |= B_INVAL;
502 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
503 nvp = vp->v_mntvnodes.le_next;
505 * Step 4: invalidate all inactive vnodes.
507 if (vp->v_usecount == 0) {
512 * Step 5: invalidate all cached file data.
514 if (vget(vp, LK_EXCLUSIVE, p))
516 if (vinvalbuf(vp, 0, cred, p, 0, 0))
517 panic("ext2_reload: dirty2");
519 * Step 6: re-read inode data for all active vnodes.
523 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
524 (int)fs->s_blocksize, NOCRED, &bp)) {
528 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
529 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)),
533 if (vp->v_mount != mountp)
540 * Common code for mount and mountroot
543 ext2_mountfs(devvp, mp, p)
544 register struct vnode *devvp;
548 register struct ufsmount *ump;
550 register struct ext2_sb_info *fs;
551 struct ext2_super_block * es;
552 dev_t dev = devvp->v_rdev;
553 struct partinfo dpart;
557 #if !defined(__FreeBSD__)
558 extern struct vnode *rootvp;
562 * Disallow multiple mounts of the same device.
563 * Disallow mounting of a device that is currently in use
564 * (except for root, which might share swap device for miniroot).
565 * Flush out any old buffers remaining from a previous use.
567 if (error = vfs_mountedon(devvp))
569 if (vcount(devvp) > 1 && devvp != rootvp)
571 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0))
574 /* turn on this to force it to be read-only */
575 mp->mnt_flag |= MNT_RDONLY;
578 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
579 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
581 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
585 size = dpart.disklab->d_secsize;
590 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
592 es = (struct ext2_super_block *)bp->b_data;
593 if (es->s_magic != EXT2_SUPER_MAGIC) {
594 if(es->s_magic == EXT2_PRE_02B_MAGIC)
595 printf("This filesystem bears the magic number of a pre "
596 "0.2b version of ext2. This is not supported by "
599 printf("Wrong magic number: %x (expected %x for EXT2FS)\n",
600 es->s_magic, EXT2_SUPER_MAGIC);
601 error = EINVAL; /* XXX needs translation */
604 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
605 bzero((caddr_t)ump, sizeof *ump);
606 /* I don't know whether this is the right strategy. Note that
607 we dynamically allocate both a ext2_sb_info and a ext2_super_block
608 while Linux keeps the super block in a locked buffer
610 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
612 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
614 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
615 if(error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)) {
622 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
623 if (!(fs->s_es->s_state & EXT2_VALID_FS)) {
624 printf("WARNING: %s was not properly dismounted\n",
627 /* if the fs is not mounted read-only, make sure the super block is
628 always written back on a sync()
631 fs->s_dirt = 1; /* mark it modified */
632 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
634 mp->mnt_data = (qaddr_t)ump;
635 mp->mnt_stat.f_fsid.val[0] = (long)dev;
636 mp->mnt_stat.f_fsid.val[1] = MOUNT_EXT2FS;
637 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
638 mp->mnt_flag |= MNT_LOCAL;
641 ump->um_devvp = devvp;
642 /* setting those two parameters allows us to use
643 ufs_bmap w/o changse !
645 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
646 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
647 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
648 for (i = 0; i < MAXQUOTAS; i++)
649 ump->um_quotas[i] = NULLVP;
650 devvp->v_specflags |= SI_MOUNTEDON;
652 ext2_sbupdate(ump, MNT_WAIT);
657 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
659 bsd_free(ump->um_fs, M_UFSMNT);
660 bsd_free(ump, M_UFSMNT);
661 mp->mnt_data = (qaddr_t)0;
667 * unmount system call
670 ext2_unmount(mp, mntflags, p)
675 register struct ufsmount *ump;
676 register struct ext2_sb_info *fs;
677 int error, flags, ronly, i;
680 if (mntflags & MNT_FORCE) {
681 if (mp->mnt_flag & MNT_ROOTFS)
685 if (error = ext2_flushfiles(mp, flags, p))
689 ronly = fs->s_rd_only;
691 fs->s_es->s_state |= EXT2_VALID_FS; /* was fs_clean = 1 */
692 ext2_sbupdate(ump, MNT_WAIT);
694 /* release buffers containing group descriptors */
695 for(i = 0; i < fs->s_db_per_group; i++)
696 brelse(fs->s_group_desc[i]);
697 /* release cached inode/block bitmaps */
698 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
699 if (fs->s_inode_bitmap[i])
700 brelse (fs->s_inode_bitmap[i]);
701 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
702 if (fs->s_block_bitmap[i])
703 brelse (fs->s_block_bitmap[i]);
705 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
706 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
708 vrele(ump->um_devvp);
709 bsd_free(fs->s_es, M_UFSMNT);
710 bsd_free(fs, M_UFSMNT);
711 bsd_free(ump, M_UFSMNT);
712 mp->mnt_data = (qaddr_t)0;
713 mp->mnt_flag &= ~MNT_LOCAL;
718 * Flush out all the files in a filesystem.
721 ext2_flushfiles(mp, flags, p)
722 register struct mount *mp;
726 register struct ufsmount *ump;
734 if (mp->mnt_flag & MNT_QUOTA) {
735 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags))
737 for (i = 0; i < MAXQUOTAS; i++) {
738 if (ump->um_quotas[i] == NULLVP)
743 * Here we fall through to vflush again to ensure
744 * that we have gotten rid of all the system vnodes.
748 error = vflush(mp, NULLVP, flags);
753 * Get file system statistics.
754 * taken from ext2/super.c ext2_statfs
757 ext2_statfs(mp, sbp, p)
759 register struct statfs *sbp;
762 unsigned long overhead;
763 unsigned long overhead_per_group;
765 register struct ufsmount *ump;
766 register struct ext2_sb_info *fs;
767 register struct ext2_super_block *es;
773 if (es->s_magic != EXT2_SUPER_MAGIC)
774 panic("ext2_statfs - magic number spoiled");
777 * Compute the overhead (FS structures)
779 overhead_per_group = 1 /* super block */ +
781 1 /* block bitmap */ +
782 1 /* inode bitmap */ +
784 overhead = es->s_first_data_block +
785 fs->s_groups_count * overhead_per_group;
787 sbp->f_type = MOUNT_EXT2FS;
788 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
789 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
790 sbp->f_blocks = es->s_blocks_count - overhead;
791 sbp->f_bfree = es->s_free_blocks_count;
792 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
793 sbp->f_files = es->s_inodes_count;
794 sbp->f_ffree = es->s_free_inodes_count;
795 if (sbp != &mp->mnt_stat) {
796 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
797 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
798 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
799 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
805 * Go through the disk queues to initiate sandbagged IO;
806 * go through the inodes to write those that have been modified;
807 * initiate the writing of the super block if it has been modified.
809 * Note: we are always called with the filesystem marked `MPBUSY'.
812 ext2_sync(mp, waitfor, cred, p)
818 register struct vnode *vp;
819 register struct inode *ip;
820 register struct ufsmount *ump = VFSTOUFS(mp);
821 register struct ext2_sb_info *fs;
822 int error, allerror = 0;
826 * Write back modified superblock.
827 * Consistency check that the superblock
828 * is still in the buffer cache.
831 #if !defined(__FreeBSD__)
835 if (fs->s_rd_only != 0) { /* XXX */
836 printf("fs = %s\n", fs->fs_fsmnt);
837 panic("update: rofs mod");
840 #if !defined(__FreeBSD__)
843 fs->s_es->s_wtime = time.tv_sec;
844 allerror = ext2_sbupdate(ump, waitfor);
847 * Write back each (modified) inode.
850 for (vp = mp->mnt_vnodelist.lh_first;
852 vp = vp->v_mntvnodes.le_next) {
854 * If the vnode that we are about to sync is no longer
855 * associated with this mount point, start over.
857 if (vp->v_mount != mp)
859 if (VOP_ISLOCKED(vp))
863 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
864 vp->v_dirtyblkhd.lh_first == NULL)
866 if (vget(vp, LK_EXCLUSIVE, p))
868 if (error = VOP_FSYNC(vp, cred, waitfor, p))
873 * Force stale file system control information to be flushed.
875 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p))
884 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
885 * in from disk. If it is in core, wait for the lock bit to clear, then
886 * return the inode locked. Detection and handling of mount points must be
887 * done by the calling routine.
890 ext2_vget(mp, ino, vpp)
895 register struct ext2_sb_info *fs;
896 register struct inode *ip;
897 struct ufsmount *ump;
907 if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
912 * Lock out the creation of new entries in the FFS hash table in
913 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
916 if (ext2fs_inode_hash_lock) {
917 while (ext2fs_inode_hash_lock) {
918 ext2fs_inode_hash_lock = -1;
919 tsleep(&ext2fs_inode_hash_lock, PVM, "ffsvgt", 0);
923 ext2fs_inode_hash_lock = 1;
926 /* Allocate a new vnode/inode. */
927 if (error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) {
931 /* I don't really know what this 'type' does. I suppose it's some kind
932 * of memory accounting. Let's just book this memory on FFS's account
933 * If I'm not mistaken, this stuff isn't implemented anyway in Lites
935 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */
936 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK);
940 bzero((caddr_t)ip, sizeof(struct inode));
943 ip->i_e2fs = fs = ump->um_e2fs;
947 for (i = 0; i < MAXQUOTAS; i++)
948 ip->i_dquot[i] = NODQUOT;
951 * Put it onto its hash chain and lock it so that other requests for
952 * this inode will block if they arrive while we are sleeping waiting
953 * for old data structures to be purged or for the contents of the
954 * disk portion of this inode to be read.
959 if (ext2fs_inode_hash_lock < 0)
960 wakeup(&ext2fs_inode_hash_lock);
961 ext2fs_inode_hash_lock = 0;
964 /* Read in the disk contents for the inode, copy into the inode. */
965 /* Read in the disk contents for the inode, copy into the inode. */
967 printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
969 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
970 (int)fs->s_blocksize, NOCRED, &bp)) {
972 * The inode does not contain anything useful, so it would
973 * be misleading to leave it on its hash chain. With mode
974 * still zero, it will be unlinked and returned to the free
982 /* convert ext2 inode to dinode */
983 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
984 ino_to_fsbo(fs, ino)), &ip->i_din);
985 ip->i_block_group = ino_to_cg(fs, ino);
986 ip->i_next_alloc_block = 0;
987 ip->i_next_alloc_goal = 0;
988 ip->i_prealloc_count = 0;
989 ip->i_prealloc_block = 0;
990 /* now we want to make sure that block pointers for unused
991 blocks are zeroed out - ext2_balloc depends on this
992 although for regular files and directories only
994 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
995 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
996 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1000 ext2_print_inode(ip);
1005 * Initialize the vnode from the inode, check for aliases.
1006 * Note that the underlying vnode may have changed.
1008 if (error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) {
1014 * Finish inode initialization now that aliasing has been resolved.
1016 ip->i_devvp = ump->um_devvp;
1019 * Set up a generation number for this inode if it does not
1020 * already have one. This should only happen on old filesystems.
1022 if (ip->i_gen == 0) {
1023 #if !defined(__FreeBSD__)
1024 struct timeval time;
1027 if (++nextgennumber < (u_long)time.tv_sec)
1028 nextgennumber = time.tv_sec;
1029 ip->i_gen = nextgennumber;
1030 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1031 ip->i_flag |= IN_MODIFIED;
1038 * File handle to vnode
1040 * Have to be really careful about stale file handles:
1041 * - check that the inode number is valid
1042 * - call ext2_vget() to get the locked inode
1043 * - check for an unallocated inode (i_mode == 0)
1044 * - check that the given client host has export rights and return
1045 * those rights via. exflagsp and credanonp
1048 ext2_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
1049 register struct mount *mp;
1054 struct ucred **credanonp;
1056 register struct ufid *ufhp;
1057 struct ext2_sb_info *fs;
1059 ufhp = (struct ufid *)fhp;
1060 fs = VFSTOUFS(mp)->um_e2fs;
1061 if (ufhp->ufid_ino < ROOTINO ||
1062 ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group)
1064 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
1068 * Vnode pointer to File handle
1072 ext2_vptofh(vp, fhp)
1076 register struct inode *ip;
1077 register struct ufid *ufhp;
1080 ufhp = (struct ufid *)fhp;
1081 ufhp->ufid_len = sizeof(struct ufid);
1082 ufhp->ufid_ino = ip->i_number;
1083 ufhp->ufid_gen = ip->i_gen;
1088 * Write a superblock and associated information back to disk.
1091 ext2_sbupdate(mp, waitfor)
1092 struct ufsmount *mp;
1095 register struct ext2_sb_info *fs = mp->um_e2fs;
1096 register struct ext2_super_block *es = fs->s_es;
1097 register struct buf *bp;
1100 printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1102 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
1103 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1104 if (waitfor == MNT_WAIT)
1109 /* write group descriptors back on disk */
1110 for(i = 0; i < fs->s_db_per_group; i++)
1111 /* Godmar thinks: we must avoid using any of the b*write
1112 * functions here: we want to keep the buffer locked
1113 * so we use my 'housemade' write routine:
1115 error |= ll_w_block(fs->s_group_desc[i], waitfor == MNT_WAIT);
1117 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
1118 if (fs->s_inode_bitmap[i])
1119 ll_w_block (fs->s_inode_bitmap[i], 1);
1120 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
1121 if (fs->s_block_bitmap[i])
1122 ll_w_block (fs->s_block_bitmap[i], 1);