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/socket.h>
55 #include <sys/mount.h>
59 #include <sys/disklabel.h>
60 #include <sys/ioctl.h>
61 #include <sys/errno.h>
62 #include <sys/malloc.h>
65 #include <miscfs/specfs/specdev.h>
67 #include <ufs/ufs/quota.h>
68 #include <ufs/ufs/ufsmount.h>
69 #include <ufs/ufs/inode.h>
70 #include <ufs/ufs/ufs_extern.h>
72 #include <gnu/ext2fs/fs.h>
73 #include <gnu/ext2fs/ext2_extern.h>
74 #include <gnu/ext2fs/ext2_fs.h>
75 #include <gnu/ext2fs/ext2_fs_sb.h>
77 static int ext2_fhtovp __P((struct mount *, struct fid *, struct mbuf *,
78 struct vnode **, int *, struct ucred **));
79 static int ext2_flushfiles __P((struct mount *mp, int flags, struct proc *p));
80 static int ext2_mount __P((struct mount *,
81 char *, caddr_t, struct nameidata *, struct proc *));
82 static int ext2_mountfs __P((struct vnode *, struct mount *, struct proc *));
83 static int ext2_reload __P((struct mount *mountp, struct ucred *cred,
85 static int ext2_sbupdate __P((struct ufsmount *, int));
86 static int ext2_statfs __P((struct mount *, struct statfs *, struct proc *));
87 static int ext2_sync __P((struct mount *, int, struct ucred *, struct proc *));
88 static int ext2_unmount __P((struct mount *, int, struct proc *));
89 static int ext2_vget __P((struct mount *, ino_t, struct vnode **));
90 static int ext2_vptofh __P((struct vnode *, struct fid *));
92 static struct vfsops ext2fs_vfsops = {
94 ufs_start, /* empty function */
96 ufs_root, /* root inode via vget */
97 ufs_quotactl, /* does operations associated with quotas */
106 #if defined(__FreeBSD__)
107 VFS_SET(ext2fs_vfsops, ext2fs, MOUNT_EXT2FS, 0);
108 #define bsd_malloc malloc
109 #define bsd_free free
112 extern u_long nextgennumber;
114 static int ext2fs_inode_hash_lock;
117 static int compute_sb_data __P((struct vnode * devvp,
118 struct ext2_super_block * es,
119 struct ext2_sb_info * fs));
122 static int ext2_mountroot __P((void));
125 * Called by main() when ext2fs is going to be mounted as root.
127 * Name is updated by mount(8) after booting.
129 #define ROOTNAME "root_device"
134 #if !defined(__FreeBSD__)
135 extern struct vnode *rootvp;
137 register struct ext2_sb_info *fs;
138 register struct mount *mp;
139 #if defined(__FreeBSD__)
140 struct proc *p = curproc;
142 struct proc *p = get_proc(); /* XXX */
144 struct ufsmount *ump;
149 * Get vnodes for swapdev and rootdev.
151 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
152 panic("ext2_mountroot: can't setup bdevvp's");
154 mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
155 bzero((char *)mp, (u_long)sizeof(struct mount));
156 mp->mnt_op = &ext2fs_vfsops;
157 mp->mnt_flag = MNT_RDONLY;
158 if (error = ext2_mountfs(rootvp, mp, p)) {
159 bsd_free(mp, M_MOUNT);
162 if (error = vfs_lock(mp)) {
163 (void)ext2_unmount(mp, 0, p);
164 bsd_free(mp, M_MOUNT);
167 #if defined(__FreeBSD__)
168 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
170 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
172 mp->mnt_flag |= MNT_ROOTFS;
173 mp->mnt_vnodecovered = NULLVP;
176 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
177 fs->fs_fsmnt[0] = '/';
178 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
180 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
182 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
183 (void)ext2_statfs(mp, &mp->mnt_stat, p);
185 inittodr(fs->s_es->s_wtime); /* this helps to set the time */
196 ext2_mount(mp, path, data, ndp, p)
197 register struct mount *mp;
199 caddr_t data; /* this is actually a (struct ufs_args *) */
200 struct nameidata *ndp;
204 struct ufs_args args;
205 struct ufsmount *ump = 0;
206 register struct ext2_sb_info *fs;
210 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
213 * If updating, check whether changing from read-only to
214 * read/write; if there is no device name, that's all we do.
216 if (mp->mnt_flag & MNT_UPDATE) {
220 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
222 if (mp->mnt_flag & MNT_FORCE)
224 if (vfs_busy(mp, LK_NOWAIT, 0, p))
226 error = ext2_flushfiles(mp, flags, p);
229 if (!error && (mp->mnt_flag & MNT_RELOAD))
230 error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p);
233 if (fs->s_rd_only && (mp->mnt_flag & MNT_WANTRDWR))
235 if (fs->s_rd_only == 0) {
236 /* don't say it's clean */
237 fs->s_es->s_state &= ~EXT2_VALID_FS;
238 ext2_sbupdate(ump, MNT_WAIT);
240 if (args.fspec == 0) {
242 * Process export requests.
244 return (vfs_export(mp, &ump->um_export, &args.export));
248 * Not an update, or updating the name: look up the name
249 * and verify that it refers to a sensible block device.
251 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
252 if (error = namei(ndp))
256 if (devvp->v_type != VBLK) {
260 if (major(devvp->v_rdev) >= nblkdev) {
264 if ((mp->mnt_flag & MNT_UPDATE) == 0)
265 error = ext2_mountfs(devvp, mp, p);
267 if (devvp != ump->um_devvp)
268 error = EINVAL; /* needs translation */
278 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
279 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
280 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
282 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
284 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
285 (void)ext2_statfs(mp, &mp->mnt_stat, p);
290 * checks that the data in the descriptor blocks make sense
291 * this is taken from ext2/super.c
293 static int ext2_check_descriptors (struct ext2_sb_info * sb)
297 unsigned long block = sb->s_es->s_first_data_block;
298 struct ext2_group_desc * gdp = NULL;
300 /* ext2_debug ("Checking group descriptors"); */
302 for (i = 0; i < sb->s_groups_count; i++)
304 /* examine next descriptor block */
305 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
306 gdp = (struct ext2_group_desc *)
307 sb->s_group_desc[desc_block++]->b_data;
308 if (gdp->bg_block_bitmap < block ||
309 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
311 printf ("ext2_check_descriptors: "
312 "Block bitmap for group %d"
313 " not in group (block %lu)!",
314 i, (unsigned long) gdp->bg_block_bitmap);
317 if (gdp->bg_inode_bitmap < block ||
318 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
320 printf ("ext2_check_descriptors: "
321 "Inode bitmap for group %d"
322 " not in group (block %lu)!",
323 i, (unsigned long) gdp->bg_inode_bitmap);
326 if (gdp->bg_inode_table < block ||
327 gdp->bg_inode_table + sb->s_itb_per_group >=
328 block + EXT2_BLOCKS_PER_GROUP(sb))
330 printf ("ext2_check_descriptors: "
331 "Inode table for group %d"
332 " not in group (block %lu)!",
333 i, (unsigned long) gdp->bg_inode_table);
336 block += EXT2_BLOCKS_PER_GROUP(sb);
343 * this computes the fields of the ext2_sb_info structure from the
344 * data in the ext2_super_block structure read in
346 static int compute_sb_data(devvp, es, fs)
347 struct vnode * devvp;
348 struct ext2_super_block * es;
349 struct ext2_sb_info * fs;
353 int logic_sb_block = 1; /* XXX for now */
358 #define V(v) printf(#v"= %d\n", fs->v);
361 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
363 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
365 fs->s_fsbtodb = es->s_log_block_size + 1;
367 fs->s_qbmask = fs->s_blocksize - 1;
369 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
371 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
374 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
376 fs->s_blocks_per_group = es->s_blocks_per_group;
377 V(s_blocks_per_group)
378 fs->s_frags_per_group = es->s_frags_per_group;
380 fs->s_inodes_per_group = es->s_inodes_per_group;
381 V(s_inodes_per_group)
382 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
383 V(s_inodes_per_block)
384 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
386 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
388 /* s_resuid / s_resgid ? */
389 fs->s_groups_count = (es->s_blocks_count -
390 es->s_first_data_block +
391 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
392 EXT2_BLOCKS_PER_GROUP(fs);
394 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
395 EXT2_DESC_PER_BLOCK(fs);
396 fs->s_db_per_group = db_count;
399 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
402 /* adjust logic_sb_block */
403 if(fs->s_blocksize > SBSIZE)
404 /* Godmar thinks: if the blocksize is greater than 1024, then
405 the superblock is logically part of block zero.
409 for (i = 0; i < db_count; i++) {
410 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
411 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]);
413 for (j = 0; j < i; j++)
414 brelse(fs->s_group_desc[j]);
415 bsd_free(fs->s_group_desc, M_UFSMNT);
416 printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
420 if(!ext2_check_descriptors(fs)) {
421 for (j = 0; j < db_count; j++)
422 brelse(fs->s_group_desc[j]);
423 bsd_free(fs->s_group_desc, M_UFSMNT);
424 printf("EXT2-fs: (ext2_check_descriptors failure) "
425 "unable to read group descriptors\n");
429 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
430 fs->s_inode_bitmap_number[i] = 0;
431 fs->s_inode_bitmap[i] = NULL;
432 fs->s_block_bitmap_number[i] = 0;
433 fs->s_block_bitmap[i] = NULL;
435 fs->s_loaded_inode_bitmaps = 0;
436 fs->s_loaded_block_bitmaps = 0;
441 * Reload all incore data for a filesystem (used after running fsck on
442 * the root filesystem and finding things to fix). The filesystem must
443 * be mounted read-only.
445 * Things to do to update the mount:
446 * 1) invalidate all cached meta-data.
447 * 2) re-read superblock from disk.
448 * 3) re-read summary information from disk.
449 * 4) invalidate all inactive vnodes.
450 * 5) invalidate all cached file data.
451 * 6) re-read inode data for all active vnodes.
454 ext2_reload(mountp, cred, p)
455 register struct mount *mountp;
459 register struct vnode *vp, *nvp, *devvp;
462 struct ext2_super_block * es;
463 struct ext2_sb_info *fs;
466 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
469 * Step 1: invalidate all cached meta-data.
471 devvp = VFSTOUFS(mountp)->um_devvp;
472 if (vinvalbuf(devvp, 0, cred, p, 0, 0))
473 panic("ext2_reload: dirty1");
475 * Step 2: re-read superblock from disk.
476 * constants have been adjusted for ext2
478 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
480 es = (struct ext2_super_block *)bp->b_data;
481 if (es->s_magic != EXT2_SUPER_MAGIC) {
482 if(es->s_magic == EXT2_PRE_02B_MAGIC)
483 printf("This filesystem bears the magic number of a pre "
484 "0.2b version of ext2. This is not supported by "
487 printf("Wrong magic number: %x (expected %x for ext2 fs\n",
488 es->s_magic, EXT2_SUPER_MAGIC);
490 return (EIO); /* XXX needs translation */
492 fs = VFSTOUFS(mountp)->um_e2fs;
493 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
495 if(error = compute_sb_data(devvp, es, fs)) {
500 if (fs->fs_sbsize < SBSIZE)
501 bp->b_flags |= B_INVAL;
506 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
507 nvp = vp->v_mntvnodes.le_next;
509 * Step 4: invalidate all inactive vnodes.
511 if (vp->v_usecount == 0) {
516 * Step 5: invalidate all cached file data.
518 if (vget(vp, LK_EXCLUSIVE, p))
520 if (vinvalbuf(vp, 0, cred, p, 0, 0))
521 panic("ext2_reload: dirty2");
523 * Step 6: re-read inode data for all active vnodes.
527 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
528 (int)fs->s_blocksize, NOCRED, &bp)) {
532 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
533 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)),
537 if (vp->v_mount != mountp)
544 * Common code for mount and mountroot
547 ext2_mountfs(devvp, mp, p)
548 register struct vnode *devvp;
552 register struct ufsmount *ump;
554 register struct ext2_sb_info *fs;
555 struct ext2_super_block * es;
556 dev_t dev = devvp->v_rdev;
557 struct partinfo dpart;
561 #if !defined(__FreeBSD__)
562 extern struct vnode *rootvp;
566 * Disallow multiple mounts of the same device.
567 * Disallow mounting of a device that is currently in use
568 * (except for root, which might share swap device for miniroot).
569 * Flush out any old buffers remaining from a previous use.
571 if (error = vfs_mountedon(devvp))
573 if (vcount(devvp) > 1 && devvp != rootvp)
575 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0))
578 /* turn on this to force it to be read-only */
579 mp->mnt_flag |= MNT_RDONLY;
582 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
583 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
585 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
589 size = dpart.disklab->d_secsize;
594 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
596 es = (struct ext2_super_block *)bp->b_data;
597 if (es->s_magic != EXT2_SUPER_MAGIC) {
598 if(es->s_magic == EXT2_PRE_02B_MAGIC)
599 printf("This filesystem bears the magic number of a pre "
600 "0.2b version of ext2. This is not supported by "
603 printf("Wrong magic number: %x (expected %x for EXT2FS)\n",
604 es->s_magic, EXT2_SUPER_MAGIC);
605 error = EINVAL; /* XXX needs translation */
608 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
609 bzero((caddr_t)ump, sizeof *ump);
610 /* I don't know whether this is the right strategy. Note that
611 we dynamically allocate both a ext2_sb_info and a ext2_super_block
612 while Linux keeps the super block in a locked buffer
614 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
616 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
618 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
619 if(error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)) {
626 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
627 if (!(fs->s_es->s_state & EXT2_VALID_FS)) {
628 printf("WARNING: %s was not properly dismounted\n",
631 /* if the fs is not mounted read-only, make sure the super block is
632 always written back on a sync()
635 fs->s_dirt = 1; /* mark it modified */
636 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
638 mp->mnt_data = (qaddr_t)ump;
639 mp->mnt_stat.f_fsid.val[0] = (long)dev;
640 mp->mnt_stat.f_fsid.val[1] = MOUNT_EXT2FS;
641 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
642 mp->mnt_flag |= MNT_LOCAL;
645 ump->um_devvp = devvp;
646 /* setting those two parameters allows us to use
647 ufs_bmap w/o changse !
649 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
650 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
651 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
652 for (i = 0; i < MAXQUOTAS; i++)
653 ump->um_quotas[i] = NULLVP;
654 devvp->v_specflags |= SI_MOUNTEDON;
656 ext2_sbupdate(ump, MNT_WAIT);
661 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
663 bsd_free(ump->um_fs, M_UFSMNT);
664 bsd_free(ump, M_UFSMNT);
665 mp->mnt_data = (qaddr_t)0;
671 * unmount system call
674 ext2_unmount(mp, mntflags, p)
679 register struct ufsmount *ump;
680 register struct ext2_sb_info *fs;
681 int error, flags, ronly, i;
684 if (mntflags & MNT_FORCE) {
685 if (mp->mnt_flag & MNT_ROOTFS)
689 if (error = ext2_flushfiles(mp, flags, p))
693 ronly = fs->s_rd_only;
695 fs->s_es->s_state |= EXT2_VALID_FS; /* was fs_clean = 1 */
696 ext2_sbupdate(ump, MNT_WAIT);
698 /* release buffers containing group descriptors */
699 for(i = 0; i < fs->s_db_per_group; i++)
700 brelse(fs->s_group_desc[i]);
701 /* release cached inode/block bitmaps */
702 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
703 if (fs->s_inode_bitmap[i])
704 brelse (fs->s_inode_bitmap[i]);
705 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
706 if (fs->s_block_bitmap[i])
707 brelse (fs->s_block_bitmap[i]);
709 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
710 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
712 vrele(ump->um_devvp);
713 bsd_free(fs->s_es, M_UFSMNT);
714 bsd_free(fs, M_UFSMNT);
715 bsd_free(ump, M_UFSMNT);
716 mp->mnt_data = (qaddr_t)0;
717 mp->mnt_flag &= ~MNT_LOCAL;
722 * Flush out all the files in a filesystem.
725 ext2_flushfiles(mp, flags, p)
726 register struct mount *mp;
730 register struct ufsmount *ump;
738 if (mp->mnt_flag & MNT_QUOTA) {
739 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags))
741 for (i = 0; i < MAXQUOTAS; i++) {
742 if (ump->um_quotas[i] == NULLVP)
747 * Here we fall through to vflush again to ensure
748 * that we have gotten rid of all the system vnodes.
752 error = vflush(mp, NULLVP, flags);
757 * Get file system statistics.
758 * taken from ext2/super.c ext2_statfs
761 ext2_statfs(mp, sbp, p)
763 register struct statfs *sbp;
766 unsigned long overhead;
767 unsigned long overhead_per_group;
769 register struct ufsmount *ump;
770 register struct ext2_sb_info *fs;
771 register struct ext2_super_block *es;
777 if (es->s_magic != EXT2_SUPER_MAGIC)
778 panic("ext2_statfs - magic number spoiled");
781 * Compute the overhead (FS structures)
783 overhead_per_group = 1 /* super block */ +
785 1 /* block bitmap */ +
786 1 /* inode bitmap */ +
788 overhead = es->s_first_data_block +
789 fs->s_groups_count * overhead_per_group;
791 sbp->f_type = MOUNT_EXT2FS;
792 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
793 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
794 sbp->f_blocks = es->s_blocks_count - overhead;
795 sbp->f_bfree = es->s_free_blocks_count;
796 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
797 sbp->f_files = es->s_inodes_count;
798 sbp->f_ffree = es->s_free_inodes_count;
799 if (sbp != &mp->mnt_stat) {
800 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
801 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
802 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
803 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
809 * Go through the disk queues to initiate sandbagged IO;
810 * go through the inodes to write those that have been modified;
811 * initiate the writing of the super block if it has been modified.
813 * Note: we are always called with the filesystem marked `MPBUSY'.
816 ext2_sync(mp, waitfor, cred, p)
822 register struct vnode *vp;
823 register struct inode *ip;
824 register struct ufsmount *ump = VFSTOUFS(mp);
825 register struct ext2_sb_info *fs;
826 int error, allerror = 0;
830 * Write back modified superblock.
831 * Consistency check that the superblock
832 * is still in the buffer cache.
835 #if !defined(__FreeBSD__)
839 if (fs->s_rd_only != 0) { /* XXX */
840 printf("fs = %s\n", fs->fs_fsmnt);
841 panic("update: rofs mod");
844 #if !defined(__FreeBSD__)
847 fs->s_es->s_wtime = time.tv_sec;
848 allerror = ext2_sbupdate(ump, waitfor);
851 * Write back each (modified) inode.
854 for (vp = mp->mnt_vnodelist.lh_first;
856 vp = vp->v_mntvnodes.le_next) {
858 * If the vnode that we are about to sync is no longer
859 * associated with this mount point, start over.
861 if (vp->v_mount != mp)
863 if (VOP_ISLOCKED(vp))
867 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
868 vp->v_dirtyblkhd.lh_first == NULL)
870 if (vget(vp, LK_EXCLUSIVE, p))
872 if (error = VOP_FSYNC(vp, cred, waitfor, p))
877 * Force stale file system control information to be flushed.
879 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p))
888 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
889 * in from disk. If it is in core, wait for the lock bit to clear, then
890 * return the inode locked. Detection and handling of mount points must be
891 * done by the calling routine.
894 ext2_vget(mp, ino, vpp)
899 register struct ext2_sb_info *fs;
900 register struct inode *ip;
901 struct ufsmount *ump;
911 if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
916 * Lock out the creation of new entries in the FFS hash table in
917 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
920 if (ext2fs_inode_hash_lock) {
921 while (ext2fs_inode_hash_lock) {
922 ext2fs_inode_hash_lock = -1;
923 tsleep(&ext2fs_inode_hash_lock, PVM, "ffsvgt", 0);
927 ext2fs_inode_hash_lock = 1;
930 /* Allocate a new vnode/inode. */
931 if (error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) {
935 /* I don't really know what this 'type' does. I suppose it's some kind
936 * of memory accounting. Let's just book this memory on FFS's account
937 * If I'm not mistaken, this stuff isn't implemented anyway in Lites
939 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */
940 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK);
944 bzero((caddr_t)ip, sizeof(struct inode));
947 ip->i_e2fs = fs = ump->um_e2fs;
951 for (i = 0; i < MAXQUOTAS; i++)
952 ip->i_dquot[i] = NODQUOT;
955 * Put it onto its hash chain and lock it so that other requests for
956 * this inode will block if they arrive while we are sleeping waiting
957 * for old data structures to be purged or for the contents of the
958 * disk portion of this inode to be read.
963 if (ext2fs_inode_hash_lock < 0)
964 wakeup(&ext2fs_inode_hash_lock);
965 ext2fs_inode_hash_lock = 0;
968 /* Read in the disk contents for the inode, copy into the inode. */
969 /* Read in the disk contents for the inode, copy into the inode. */
971 printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
973 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
974 (int)fs->s_blocksize, NOCRED, &bp)) {
976 * The inode does not contain anything useful, so it would
977 * be misleading to leave it on its hash chain. With mode
978 * still zero, it will be unlinked and returned to the free
986 /* convert ext2 inode to dinode */
987 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
988 ino_to_fsbo(fs, ino)), &ip->i_din);
989 ip->i_block_group = ino_to_cg(fs, ino);
990 ip->i_next_alloc_block = 0;
991 ip->i_next_alloc_goal = 0;
992 ip->i_prealloc_count = 0;
993 ip->i_prealloc_block = 0;
994 /* now we want to make sure that block pointers for unused
995 blocks are zeroed out - ext2_balloc depends on this
996 although for regular files and directories only
998 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
999 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
1000 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1004 ext2_print_inode(ip);
1009 * Initialize the vnode from the inode, check for aliases.
1010 * Note that the underlying vnode may have changed.
1012 if (error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) {
1018 * Finish inode initialization now that aliasing has been resolved.
1020 ip->i_devvp = ump->um_devvp;
1023 * Set up a generation number for this inode if it does not
1024 * already have one. This should only happen on old filesystems.
1026 if (ip->i_gen == 0) {
1027 #if !defined(__FreeBSD__)
1028 struct timeval time;
1031 if (++nextgennumber < (u_long)time.tv_sec)
1032 nextgennumber = time.tv_sec;
1033 ip->i_gen = nextgennumber;
1034 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1035 ip->i_flag |= IN_MODIFIED;
1042 * File handle to vnode
1044 * Have to be really careful about stale file handles:
1045 * - check that the inode number is valid
1046 * - call ext2_vget() to get the locked inode
1047 * - check for an unallocated inode (i_mode == 0)
1048 * - check that the given client host has export rights and return
1049 * those rights via. exflagsp and credanonp
1052 ext2_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
1053 register struct mount *mp;
1058 struct ucred **credanonp;
1060 register struct ufid *ufhp;
1061 struct ext2_sb_info *fs;
1063 ufhp = (struct ufid *)fhp;
1064 fs = VFSTOUFS(mp)->um_e2fs;
1065 if (ufhp->ufid_ino < ROOTINO ||
1066 ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group)
1068 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
1072 * Vnode pointer to File handle
1076 ext2_vptofh(vp, fhp)
1080 register struct inode *ip;
1081 register struct ufid *ufhp;
1084 ufhp = (struct ufid *)fhp;
1085 ufhp->ufid_len = sizeof(struct ufid);
1086 ufhp->ufid_ino = ip->i_number;
1087 ufhp->ufid_gen = ip->i_gen;
1092 * Write a superblock and associated information back to disk.
1095 ext2_sbupdate(mp, waitfor)
1096 struct ufsmount *mp;
1099 register struct ext2_sb_info *fs = mp->um_e2fs;
1100 register struct ext2_super_block *es = fs->s_es;
1101 register struct buf *bp;
1104 printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1106 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
1107 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1108 if (waitfor == MNT_WAIT)
1113 /* write group descriptors back on disk */
1114 for(i = 0; i < fs->s_db_per_group; i++)
1115 /* Godmar thinks: we must avoid using any of the b*write
1116 * functions here: we want to keep the buffer locked
1117 * so we use my 'housemade' write routine:
1119 error |= ll_w_block(fs->s_group_desc[i], waitfor == MNT_WAIT);
1121 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
1122 if (fs->s_inode_bitmap[i])
1123 ll_w_block (fs->s_inode_bitmap[i], 1);
1124 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
1125 if (fs->s_block_bitmap[i])
1126 ll_w_block (fs->s_block_bitmap[i], 1);