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>
58 #include <sys/fcntl.h>
59 #include <sys/disklabel.h>
60 #include <sys/errno.h>
61 #include <sys/malloc.h>
64 #include <miscfs/specfs/specdev.h>
66 #include <ufs/ufs/quota.h>
67 #include <ufs/ufs/ufsmount.h>
68 #include <ufs/ufs/inode.h>
69 #include <ufs/ufs/ufs_extern.h>
71 #include <gnu/ext2fs/fs.h>
72 #include <gnu/ext2fs/ext2_extern.h>
73 #include <gnu/ext2fs/ext2_fs.h>
74 #include <gnu/ext2fs/ext2_fs_sb.h>
76 static int ext2_fhtovp __P((struct mount *, struct fid *, struct mbuf *,
77 struct vnode **, int *, struct ucred **));
78 static int ext2_flushfiles __P((struct mount *mp, int flags, struct proc *p));
79 static int ext2_mount __P((struct mount *,
80 char *, caddr_t, struct nameidata *, struct proc *));
81 static int ext2_mountfs __P((struct vnode *, struct mount *, struct proc *));
82 static int ext2_reload __P((struct mount *mountp, struct ucred *cred,
84 static int ext2_sbupdate __P((struct ufsmount *, int));
85 static int ext2_statfs __P((struct mount *, struct statfs *, struct proc *));
86 static int ext2_sync __P((struct mount *, int, struct ucred *, struct proc *));
87 static int ext2_unmount __P((struct mount *, int, struct proc *));
88 static int ext2_vget __P((struct mount *, ino_t, struct vnode **));
89 static int ext2_vptofh __P((struct vnode *, struct fid *));
91 static struct vfsops ext2fs_vfsops = {
93 ufs_start, /* empty function */
95 ufs_root, /* root inode via vget */
96 ufs_quotactl, /* does operations associated with quotas */
105 #if defined(__FreeBSD__)
106 VFS_SET(ext2fs_vfsops, ext2fs, MOUNT_EXT2FS, 0);
107 #define bsd_malloc malloc
108 #define bsd_free free
111 extern u_long nextgennumber;
113 static int ext2fs_inode_hash_lock;
116 static int compute_sb_data __P((struct vnode * devvp,
117 struct ext2_super_block * es,
118 struct ext2_sb_info * fs));
121 static int ext2_mountroot __P((void));
124 * Called by main() when ext2fs is going to be mounted as root.
126 * Name is updated by mount(8) after booting.
128 #define ROOTNAME "root_device"
133 #if !defined(__FreeBSD__)
134 extern struct vnode *rootvp;
136 register struct ext2_sb_info *fs;
137 register struct mount *mp;
138 #if defined(__FreeBSD__)
139 struct proc *p = curproc;
141 struct proc *p = get_proc(); /* XXX */
143 struct ufsmount *ump;
148 * Get vnodes for swapdev and rootdev.
150 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
151 panic("ext2_mountroot: can't setup bdevvp's");
153 mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
154 bzero((char *)mp, (u_long)sizeof(struct mount));
155 mp->mnt_op = &ext2fs_vfsops;
156 mp->mnt_flag = MNT_RDONLY;
157 if (error = ext2_mountfs(rootvp, mp, p)) {
158 bsd_free(mp, M_MOUNT);
161 if (error = vfs_lock(mp)) {
162 (void)ext2_unmount(mp, 0, p);
163 bsd_free(mp, M_MOUNT);
166 #if defined(__FreeBSD__)
167 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
169 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
171 mp->mnt_flag |= MNT_ROOTFS;
172 mp->mnt_vnodecovered = NULLVP;
175 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
176 fs->fs_fsmnt[0] = '/';
177 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
179 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
181 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
182 (void)ext2_statfs(mp, &mp->mnt_stat, p);
184 inittodr(fs->s_es->s_wtime); /* this helps to set the time */
195 ext2_mount(mp, path, data, ndp, p)
196 register struct mount *mp;
198 caddr_t data; /* this is actually a (struct ufs_args *) */
199 struct nameidata *ndp;
203 struct ufs_args args;
204 struct ufsmount *ump = 0;
205 register struct ext2_sb_info *fs;
209 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
212 * If updating, check whether changing from read-only to
213 * read/write; if there is no device name, that's all we do.
215 if (mp->mnt_flag & MNT_UPDATE) {
219 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
221 if (mp->mnt_flag & MNT_FORCE)
223 if (vfs_busy(mp, LK_NOWAIT, 0, p))
225 error = ext2_flushfiles(mp, flags, p);
228 if (!error && (mp->mnt_flag & MNT_RELOAD))
229 error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p);
232 if (fs->s_rd_only && (mp->mnt_flag & MNT_WANTRDWR))
234 if (fs->s_rd_only == 0) {
235 /* don't say it's clean */
236 fs->s_es->s_state &= ~EXT2_VALID_FS;
237 ext2_sbupdate(ump, MNT_WAIT);
239 if (args.fspec == 0) {
241 * Process export requests.
243 return (vfs_export(mp, &ump->um_export, &args.export));
247 * Not an update, or updating the name: look up the name
248 * and verify that it refers to a sensible block device.
250 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
251 if (error = namei(ndp))
255 if (devvp->v_type != VBLK) {
259 if (major(devvp->v_rdev) >= nblkdev) {
263 if ((mp->mnt_flag & MNT_UPDATE) == 0)
264 error = ext2_mountfs(devvp, mp, p);
266 if (devvp != ump->um_devvp)
267 error = EINVAL; /* needs translation */
277 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
278 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
279 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
281 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
283 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
284 (void)ext2_statfs(mp, &mp->mnt_stat, p);
289 * checks that the data in the descriptor blocks make sense
290 * this is taken from ext2/super.c
292 static int ext2_check_descriptors (struct ext2_sb_info * sb)
296 unsigned long block = sb->s_es->s_first_data_block;
297 struct ext2_group_desc * gdp = NULL;
299 /* ext2_debug ("Checking group descriptors"); */
301 for (i = 0; i < sb->s_groups_count; i++)
303 /* examine next descriptor block */
304 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
305 gdp = (struct ext2_group_desc *)
306 sb->s_group_desc[desc_block++]->b_data;
307 if (gdp->bg_block_bitmap < block ||
308 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
310 printf ("ext2_check_descriptors: "
311 "Block bitmap for group %d"
312 " not in group (block %lu)!",
313 i, (unsigned long) gdp->bg_block_bitmap);
316 if (gdp->bg_inode_bitmap < block ||
317 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
319 printf ("ext2_check_descriptors: "
320 "Inode bitmap for group %d"
321 " not in group (block %lu)!",
322 i, (unsigned long) gdp->bg_inode_bitmap);
325 if (gdp->bg_inode_table < block ||
326 gdp->bg_inode_table + sb->s_itb_per_group >=
327 block + EXT2_BLOCKS_PER_GROUP(sb))
329 printf ("ext2_check_descriptors: "
330 "Inode table for group %d"
331 " not in group (block %lu)!",
332 i, (unsigned long) gdp->bg_inode_table);
335 block += EXT2_BLOCKS_PER_GROUP(sb);
342 * this computes the fields of the ext2_sb_info structure from the
343 * data in the ext2_super_block structure read in
345 static int compute_sb_data(devvp, es, fs)
346 struct vnode * devvp;
347 struct ext2_super_block * es;
348 struct ext2_sb_info * fs;
352 int logic_sb_block = 1; /* XXX for now */
357 #define V(v) printf(#v"= %d\n", fs->v);
360 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
362 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
364 fs->s_fsbtodb = es->s_log_block_size + 1;
366 fs->s_qbmask = fs->s_blocksize - 1;
368 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
370 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
373 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
375 fs->s_blocks_per_group = es->s_blocks_per_group;
376 V(s_blocks_per_group)
377 fs->s_frags_per_group = es->s_frags_per_group;
379 fs->s_inodes_per_group = es->s_inodes_per_group;
380 V(s_inodes_per_group)
381 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
382 V(s_inodes_per_block)
383 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
385 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
387 /* s_resuid / s_resgid ? */
388 fs->s_groups_count = (es->s_blocks_count -
389 es->s_first_data_block +
390 EXT2_BLOCKS_PER_GROUP(fs) - 1) /
391 EXT2_BLOCKS_PER_GROUP(fs);
393 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
394 EXT2_DESC_PER_BLOCK(fs);
395 fs->s_db_per_group = db_count;
398 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
401 /* adjust logic_sb_block */
402 if(fs->s_blocksize > SBSIZE)
403 /* Godmar thinks: if the blocksize is greater than 1024, then
404 the superblock is logically part of block zero.
408 for (i = 0; i < db_count; i++) {
409 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
410 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]);
412 for (j = 0; j < i; j++)
413 brelse(fs->s_group_desc[j]);
414 bsd_free(fs->s_group_desc, M_UFSMNT);
415 printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
419 if(!ext2_check_descriptors(fs)) {
420 for (j = 0; j < db_count; j++)
421 brelse(fs->s_group_desc[j]);
422 bsd_free(fs->s_group_desc, M_UFSMNT);
423 printf("EXT2-fs: (ext2_check_descriptors failure) "
424 "unable to read group descriptors\n");
428 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
429 fs->s_inode_bitmap_number[i] = 0;
430 fs->s_inode_bitmap[i] = NULL;
431 fs->s_block_bitmap_number[i] = 0;
432 fs->s_block_bitmap[i] = NULL;
434 fs->s_loaded_inode_bitmaps = 0;
435 fs->s_loaded_block_bitmaps = 0;
440 * Reload all incore data for a filesystem (used after running fsck on
441 * the root filesystem and finding things to fix). The filesystem must
442 * be mounted read-only.
444 * Things to do to update the mount:
445 * 1) invalidate all cached meta-data.
446 * 2) re-read superblock from disk.
447 * 3) re-read summary information from disk.
448 * 4) invalidate all inactive vnodes.
449 * 5) invalidate all cached file data.
450 * 6) re-read inode data for all active vnodes.
453 ext2_reload(mountp, cred, p)
454 register struct mount *mountp;
458 register struct vnode *vp, *nvp, *devvp;
461 struct ext2_super_block * es;
462 struct ext2_sb_info *fs;
465 if ((mountp->mnt_flag & MNT_RDONLY) == 0)
468 * Step 1: invalidate all cached meta-data.
470 devvp = VFSTOUFS(mountp)->um_devvp;
471 if (vinvalbuf(devvp, 0, cred, p, 0, 0))
472 panic("ext2_reload: dirty1");
474 * Step 2: re-read superblock from disk.
475 * constants have been adjusted for ext2
477 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
479 es = (struct ext2_super_block *)bp->b_data;
480 if (es->s_magic != EXT2_SUPER_MAGIC) {
481 if(es->s_magic == EXT2_PRE_02B_MAGIC)
482 printf("This filesystem bears the magic number of a pre "
483 "0.2b version of ext2. This is not supported by "
486 printf("Wrong magic number: %x (expected %x for ext2 fs\n",
487 es->s_magic, EXT2_SUPER_MAGIC);
489 return (EIO); /* XXX needs translation */
491 fs = VFSTOUFS(mountp)->um_e2fs;
492 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
494 if(error = compute_sb_data(devvp, es, fs)) {
499 if (fs->fs_sbsize < SBSIZE)
500 bp->b_flags |= B_INVAL;
505 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
506 nvp = vp->v_mntvnodes.le_next;
508 * Step 4: invalidate all inactive vnodes.
510 if (vp->v_usecount == 0) {
515 * Step 5: invalidate all cached file data.
517 if (vget(vp, LK_EXCLUSIVE, p))
519 if (vinvalbuf(vp, 0, cred, p, 0, 0))
520 panic("ext2_reload: dirty2");
522 * Step 6: re-read inode data for all active vnodes.
526 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
527 (int)fs->s_blocksize, NOCRED, &bp)) {
531 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
532 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)),
536 if (vp->v_mount != mountp)
543 * Common code for mount and mountroot
546 ext2_mountfs(devvp, mp, p)
547 register struct vnode *devvp;
551 register struct ufsmount *ump;
553 register struct ext2_sb_info *fs;
554 struct ext2_super_block * es;
555 dev_t dev = devvp->v_rdev;
556 struct partinfo dpart;
560 #if !defined(__FreeBSD__)
561 extern struct vnode *rootvp;
565 * Disallow multiple mounts of the same device.
566 * Disallow mounting of a device that is currently in use
567 * (except for root, which might share swap device for miniroot).
568 * Flush out any old buffers remaining from a previous use.
570 if (error = vfs_mountedon(devvp))
572 if (vcount(devvp) > 1 && devvp != rootvp)
574 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0))
577 /* turn on this to force it to be read-only */
578 mp->mnt_flag |= MNT_RDONLY;
581 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
582 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
584 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
588 size = dpart.disklab->d_secsize;
593 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
595 es = (struct ext2_super_block *)bp->b_data;
596 if (es->s_magic != EXT2_SUPER_MAGIC) {
597 if(es->s_magic == EXT2_PRE_02B_MAGIC)
598 printf("This filesystem bears the magic number of a pre "
599 "0.2b version of ext2. This is not supported by "
602 printf("Wrong magic number: %x (expected %x for EXT2FS)\n",
603 es->s_magic, EXT2_SUPER_MAGIC);
604 error = EINVAL; /* XXX needs translation */
607 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
608 bzero((caddr_t)ump, sizeof *ump);
609 /* I don't know whether this is the right strategy. Note that
610 we dynamically allocate both a ext2_sb_info and a ext2_super_block
611 while Linux keeps the super block in a locked buffer
613 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
615 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
617 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
618 if(error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)) {
625 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
626 if (!(fs->s_es->s_state & EXT2_VALID_FS)) {
627 printf("WARNING: %s was not properly dismounted\n",
630 /* if the fs is not mounted read-only, make sure the super block is
631 always written back on a sync()
634 fs->s_dirt = 1; /* mark it modified */
635 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
637 mp->mnt_data = (qaddr_t)ump;
638 mp->mnt_stat.f_fsid.val[0] = (long)dev;
639 mp->mnt_stat.f_fsid.val[1] = MOUNT_EXT2FS;
640 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
641 mp->mnt_flag |= MNT_LOCAL;
644 ump->um_devvp = devvp;
645 /* setting those two parameters allows us to use
646 ufs_bmap w/o changse !
648 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
649 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
650 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
651 for (i = 0; i < MAXQUOTAS; i++)
652 ump->um_quotas[i] = NULLVP;
653 devvp->v_specflags |= SI_MOUNTEDON;
655 ext2_sbupdate(ump, MNT_WAIT);
660 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
662 bsd_free(ump->um_fs, M_UFSMNT);
663 bsd_free(ump, M_UFSMNT);
664 mp->mnt_data = (qaddr_t)0;
670 * unmount system call
673 ext2_unmount(mp, mntflags, p)
678 register struct ufsmount *ump;
679 register struct ext2_sb_info *fs;
680 int error, flags, ronly, i;
683 if (mntflags & MNT_FORCE) {
684 if (mp->mnt_flag & MNT_ROOTFS)
688 if (error = ext2_flushfiles(mp, flags, p))
692 ronly = fs->s_rd_only;
694 fs->s_es->s_state |= EXT2_VALID_FS; /* was fs_clean = 1 */
695 ext2_sbupdate(ump, MNT_WAIT);
697 /* release buffers containing group descriptors */
698 for(i = 0; i < fs->s_db_per_group; i++)
699 brelse(fs->s_group_desc[i]);
700 /* release cached inode/block bitmaps */
701 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
702 if (fs->s_inode_bitmap[i])
703 brelse (fs->s_inode_bitmap[i]);
704 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
705 if (fs->s_block_bitmap[i])
706 brelse (fs->s_block_bitmap[i]);
708 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
709 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
711 vrele(ump->um_devvp);
712 bsd_free(fs->s_es, M_UFSMNT);
713 bsd_free(fs, M_UFSMNT);
714 bsd_free(ump, M_UFSMNT);
715 mp->mnt_data = (qaddr_t)0;
716 mp->mnt_flag &= ~MNT_LOCAL;
721 * Flush out all the files in a filesystem.
724 ext2_flushfiles(mp, flags, p)
725 register struct mount *mp;
729 register struct ufsmount *ump;
737 if (mp->mnt_flag & MNT_QUOTA) {
738 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags))
740 for (i = 0; i < MAXQUOTAS; i++) {
741 if (ump->um_quotas[i] == NULLVP)
746 * Here we fall through to vflush again to ensure
747 * that we have gotten rid of all the system vnodes.
751 error = vflush(mp, NULLVP, flags);
756 * Get file system statistics.
757 * taken from ext2/super.c ext2_statfs
760 ext2_statfs(mp, sbp, p)
762 register struct statfs *sbp;
765 unsigned long overhead;
766 unsigned long overhead_per_group;
768 register struct ufsmount *ump;
769 register struct ext2_sb_info *fs;
770 register struct ext2_super_block *es;
776 if (es->s_magic != EXT2_SUPER_MAGIC)
777 panic("ext2_statfs - magic number spoiled");
780 * Compute the overhead (FS structures)
782 overhead_per_group = 1 /* super block */ +
784 1 /* block bitmap */ +
785 1 /* inode bitmap */ +
787 overhead = es->s_first_data_block +
788 fs->s_groups_count * overhead_per_group;
790 sbp->f_type = MOUNT_EXT2FS;
791 sbp->f_bsize = EXT2_FRAG_SIZE(fs);
792 sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
793 sbp->f_blocks = es->s_blocks_count - overhead;
794 sbp->f_bfree = es->s_free_blocks_count;
795 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
796 sbp->f_files = es->s_inodes_count;
797 sbp->f_ffree = es->s_free_inodes_count;
798 if (sbp != &mp->mnt_stat) {
799 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
800 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
801 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
802 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
808 * Go through the disk queues to initiate sandbagged IO;
809 * go through the inodes to write those that have been modified;
810 * initiate the writing of the super block if it has been modified.
812 * Note: we are always called with the filesystem marked `MPBUSY'.
815 ext2_sync(mp, waitfor, cred, p)
821 register struct vnode *vp;
822 register struct inode *ip;
823 register struct ufsmount *ump = VFSTOUFS(mp);
824 register struct ext2_sb_info *fs;
825 int error, allerror = 0;
829 * Write back modified superblock.
830 * Consistency check that the superblock
831 * is still in the buffer cache.
834 #if !defined(__FreeBSD__)
838 if (fs->s_rd_only != 0) { /* XXX */
839 printf("fs = %s\n", fs->fs_fsmnt);
840 panic("update: rofs mod");
843 #if !defined(__FreeBSD__)
846 fs->s_es->s_wtime = time.tv_sec;
847 allerror = ext2_sbupdate(ump, waitfor);
850 * Write back each (modified) inode.
853 for (vp = mp->mnt_vnodelist.lh_first;
855 vp = vp->v_mntvnodes.le_next) {
857 * If the vnode that we are about to sync is no longer
858 * associated with this mount point, start over.
860 if (vp->v_mount != mp)
862 if (VOP_ISLOCKED(vp))
866 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
867 vp->v_dirtyblkhd.lh_first == NULL)
869 if (vget(vp, LK_EXCLUSIVE, p))
871 if (error = VOP_FSYNC(vp, cred, waitfor, p))
876 * Force stale file system control information to be flushed.
878 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p))
887 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
888 * in from disk. If it is in core, wait for the lock bit to clear, then
889 * return the inode locked. Detection and handling of mount points must be
890 * done by the calling routine.
893 ext2_vget(mp, ino, vpp)
898 register struct ext2_sb_info *fs;
899 register struct inode *ip;
900 struct ufsmount *ump;
910 if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
915 * Lock out the creation of new entries in the FFS hash table in
916 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
919 if (ext2fs_inode_hash_lock) {
920 while (ext2fs_inode_hash_lock) {
921 ext2fs_inode_hash_lock = -1;
922 tsleep(&ext2fs_inode_hash_lock, PVM, "ffsvgt", 0);
926 ext2fs_inode_hash_lock = 1;
929 /* Allocate a new vnode/inode. */
930 if (error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) {
934 /* I don't really know what this 'type' does. I suppose it's some kind
935 * of memory accounting. Let's just book this memory on FFS's account
936 * If I'm not mistaken, this stuff isn't implemented anyway in Lites
938 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */
939 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK);
943 bzero((caddr_t)ip, sizeof(struct inode));
946 ip->i_e2fs = fs = ump->um_e2fs;
950 for (i = 0; i < MAXQUOTAS; i++)
951 ip->i_dquot[i] = NODQUOT;
954 * Put it onto its hash chain and lock it so that other requests for
955 * this inode will block if they arrive while we are sleeping waiting
956 * for old data structures to be purged or for the contents of the
957 * disk portion of this inode to be read.
962 if (ext2fs_inode_hash_lock < 0)
963 wakeup(&ext2fs_inode_hash_lock);
964 ext2fs_inode_hash_lock = 0;
967 /* Read in the disk contents for the inode, copy into the inode. */
968 /* Read in the disk contents for the inode, copy into the inode. */
970 printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
972 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
973 (int)fs->s_blocksize, NOCRED, &bp)) {
975 * The inode does not contain anything useful, so it would
976 * be misleading to leave it on its hash chain. With mode
977 * still zero, it will be unlinked and returned to the free
985 /* convert ext2 inode to dinode */
986 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
987 ino_to_fsbo(fs, ino)), &ip->i_din);
988 ip->i_block_group = ino_to_cg(fs, ino);
989 ip->i_next_alloc_block = 0;
990 ip->i_next_alloc_goal = 0;
991 ip->i_prealloc_count = 0;
992 ip->i_prealloc_block = 0;
993 /* now we want to make sure that block pointers for unused
994 blocks are zeroed out - ext2_balloc depends on this
995 although for regular files and directories only
997 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
998 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
999 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1003 ext2_print_inode(ip);
1008 * Initialize the vnode from the inode, check for aliases.
1009 * Note that the underlying vnode may have changed.
1011 if (error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) {
1017 * Finish inode initialization now that aliasing has been resolved.
1019 ip->i_devvp = ump->um_devvp;
1022 * Set up a generation number for this inode if it does not
1023 * already have one. This should only happen on old filesystems.
1025 if (ip->i_gen == 0) {
1026 #if !defined(__FreeBSD__)
1027 struct timeval time;
1030 if (++nextgennumber < (u_long)time.tv_sec)
1031 nextgennumber = time.tv_sec;
1032 ip->i_gen = nextgennumber;
1033 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1034 ip->i_flag |= IN_MODIFIED;
1041 * File handle to vnode
1043 * Have to be really careful about stale file handles:
1044 * - check that the inode number is valid
1045 * - call ext2_vget() to get the locked inode
1046 * - check for an unallocated inode (i_mode == 0)
1047 * - check that the given client host has export rights and return
1048 * those rights via. exflagsp and credanonp
1051 ext2_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
1052 register struct mount *mp;
1057 struct ucred **credanonp;
1059 register struct ufid *ufhp;
1060 struct ext2_sb_info *fs;
1062 ufhp = (struct ufid *)fhp;
1063 fs = VFSTOUFS(mp)->um_e2fs;
1064 if (ufhp->ufid_ino < ROOTINO ||
1065 ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group)
1067 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
1071 * Vnode pointer to File handle
1075 ext2_vptofh(vp, fhp)
1079 register struct inode *ip;
1080 register struct ufid *ufhp;
1083 ufhp = (struct ufid *)fhp;
1084 ufhp->ufid_len = sizeof(struct ufid);
1085 ufhp->ufid_ino = ip->i_number;
1086 ufhp->ufid_gen = ip->i_gen;
1091 * Write a superblock and associated information back to disk.
1094 ext2_sbupdate(mp, waitfor)
1095 struct ufsmount *mp;
1098 register struct ext2_sb_info *fs = mp->um_e2fs;
1099 register struct ext2_super_block *es = fs->s_es;
1100 register struct buf *bp;
1103 printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1105 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
1106 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1107 if (waitfor == MNT_WAIT)
1112 /* write group descriptors back on disk */
1113 for(i = 0; i < fs->s_db_per_group; i++)
1114 /* Godmar thinks: we must avoid using any of the b*write
1115 * functions here: we want to keep the buffer locked
1116 * so we use my 'housemade' write routine:
1118 error |= ll_w_block(fs->s_group_desc[i], waitfor == MNT_WAIT);
1120 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
1121 if (fs->s_inode_bitmap[i])
1122 ll_w_block (fs->s_inode_bitmap[i], 1);
1123 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
1124 if (fs->s_block_bitmap[i])
1125 ll_w_block (fs->s_block_bitmap[i], 1);