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31 * @(#)ffs_subr.c 8.5 (Berkeley) 3/21/95
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
44 #include <sys/errno.h>
45 #include <ufs/ufs/dinode.h>
46 #include <ufs/ffs/fs.h>
48 uint32_t calculate_crc32c(uint32_t, const void *, size_t);
49 uint32_t ffs_calc_sbhash(struct fs *);
51 #define UFS_MALLOC(size, type, flags) malloc(size)
52 #define UFS_FREE(ptr, type) free(ptr)
53 #define UFS_TIME time(NULL)
55 * Request standard superblock location in ffs_sbget
57 #define STDSB -1 /* Fail if check-hash is bad */
58 #define STDSB_NOHASHFAIL -2 /* Ignore check-hash failure */
61 #include <sys/systm.h>
62 #include <sys/gsb_crc32.h>
64 #include <sys/malloc.h>
65 #include <sys/mount.h>
66 #include <sys/vnode.h>
69 #include <sys/ucred.h>
71 #include <ufs/ufs/quota.h>
72 #include <ufs/ufs/inode.h>
73 #include <ufs/ufs/extattr.h>
74 #include <ufs/ufs/ufsmount.h>
75 #include <ufs/ufs/ufs_extern.h>
76 #include <ufs/ffs/ffs_extern.h>
77 #include <ufs/ffs/fs.h>
79 #define UFS_MALLOC(size, type, flags) malloc(size, type, flags)
80 #define UFS_FREE(ptr, type) free(ptr, type)
81 #define UFS_TIME time_second
84 * Return buffer with the contents of block "offset" from the beginning of
85 * directory "ip". If "res" is non-zero, fill it in with a pointer to the
86 * remaining space in the directory.
89 ffs_blkatoff(struct vnode *vp, off_t offset, char **res, struct buf **bpp)
99 lbn = lblkno(fs, offset);
100 bsize = blksize(fs, ip, lbn);
103 error = bread(vp, lbn, bsize, NOCRED, &bp);
108 *res = (char *)bp->b_data + blkoff(fs, offset);
114 * Load up the contents of an inode and copy the appropriate pieces
115 * to the incore copy.
118 ffs_load_inode(struct buf *bp, struct inode *ip, struct fs *fs, ino_t ino)
120 struct ufs1_dinode *dip1;
121 struct ufs2_dinode *dip2;
127 *((struct ufs1_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
128 ip->i_mode = dip1->di_mode;
129 ip->i_nlink = dip1->di_nlink;
130 ip->i_effnlink = dip1->di_nlink;
131 ip->i_size = dip1->di_size;
132 ip->i_flags = dip1->di_flags;
133 ip->i_gen = dip1->di_gen;
134 ip->i_uid = dip1->di_uid;
135 ip->i_gid = dip1->di_gid;
138 dip2 = ((struct ufs2_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
139 if ((error = ffs_verify_dinode_ckhash(fs, dip2)) != 0) {
140 printf("%s: inode %jd: check-hash failed\n", fs->fs_fsmnt,
146 ip->i_mode = dip2->di_mode;
147 ip->i_nlink = dip2->di_nlink;
148 ip->i_effnlink = dip2->di_nlink;
149 ip->i_size = dip2->di_size;
150 ip->i_flags = dip2->di_flags;
151 ip->i_gen = dip2->di_gen;
152 ip->i_uid = dip2->di_uid;
153 ip->i_gid = dip2->di_gid;
158 * Verify that a filesystem block number is a valid data block.
159 * This routine is only called on untrusted filesystems.
162 ffs_check_blkno(struct mount *mp, ino_t inum, ufs2_daddr_t daddr, int blksize)
165 struct ufsmount *ump;
166 ufs2_daddr_t end_daddr;
169 KASSERT((mp->mnt_flag & MNT_UNTRUSTED) != 0,
170 ("ffs_check_blkno called on a trusted file system"));
173 cg = dtog(fs, daddr);
174 end_daddr = daddr + numfrags(fs, blksize);
176 * Verify that the block number is a valid data block. Also check
177 * that it does not point to an inode block or a superblock. Accept
178 * blocks that are unalloacted (0) or part of snapshot metadata
179 * (BLK_NOCOPY or BLK_SNAP).
181 * Thus, the block must be in a valid range for the filesystem and
182 * either in the space before a backup superblock (except the first
183 * cylinder group where that space is used by the bootstrap code) or
184 * after the inode blocks and before the end of the cylinder group.
186 if ((uint64_t)daddr <= BLK_SNAP ||
187 ((uint64_t)end_daddr <= fs->fs_size &&
188 ((cg > 0 && end_daddr <= cgsblock(fs, cg)) ||
189 (daddr >= cgdmin(fs, cg) &&
190 end_daddr <= cgbase(fs, cg) + fs->fs_fpg))))
192 if ((havemtx = mtx_owned(UFS_MTX(ump))) == 0)
194 if (ppsratecheck(&ump->um_last_integritymsg,
195 &ump->um_secs_integritymsg, 1)) {
197 uprintf("\n%s: inode %jd, out-of-range indirect block "
198 "number %jd\n", mp->mnt_stat.f_mntonname, inum, daddr);
208 * Verify an inode check-hash.
211 ffs_verify_dinode_ckhash(struct fs *fs, struct ufs2_dinode *dip)
213 uint32_t ckhash, save_ckhash;
216 * Return success if unallocated or we are not doing inode check-hash.
218 if (dip->di_mode == 0 || (fs->fs_metackhash & CK_INODE) == 0)
221 * Exclude di_ckhash from the crc32 calculation, e.g., always use
222 * a check-hash value of zero when calculating the check-hash.
224 save_ckhash = dip->di_ckhash;
226 ckhash = calculate_crc32c(~0L, (void *)dip, sizeof(*dip));
227 dip->di_ckhash = save_ckhash;
228 if (save_ckhash == ckhash)
234 * Update an inode check-hash.
237 ffs_update_dinode_ckhash(struct fs *fs, struct ufs2_dinode *dip)
240 if (dip->di_mode == 0 || (fs->fs_metackhash & CK_INODE) == 0)
243 * Exclude old di_ckhash from the crc32 calculation, e.g., always use
244 * a check-hash value of zero when calculating the new check-hash.
247 dip->di_ckhash = calculate_crc32c(~0L, (void *)dip, sizeof(*dip));
251 * These are the low-level functions that actually read and write
252 * the superblock and its associated data.
254 static off_t sblock_try[] = SBLOCKSEARCH;
255 static int readsuper(void *, struct fs **, off_t, int, int,
256 int (*)(void *, off_t, void **, int));
259 * Read a superblock from the devfd device.
261 * If an alternate superblock is specified, it is read. Otherwise the
262 * set of locations given in the SBLOCKSEARCH list is searched for a
263 * superblock. Memory is allocated for the superblock by the readfunc and
264 * is returned. If filltype is non-NULL, additional memory is allocated
265 * of type filltype and filled in with the superblock summary information.
266 * All memory is freed when any error is returned.
268 * If a superblock is found, zero is returned. Otherwise one of the
269 * following error values is returned:
270 * EIO: non-existent or truncated superblock.
271 * EIO: error reading summary information.
272 * ENOENT: no usable known superblock found.
273 * ENOSPC: failed to allocate space for the superblock.
274 * EINVAL: The previous newfs operation on this volume did not complete.
275 * The administrator must complete newfs before using this volume.
278 ffs_sbget(void *devfd, struct fs **fsp, off_t altsblock,
279 struct malloc_type *filltype,
280 int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
283 int i, error, size, blks;
292 if (altsblock >= 0) {
293 if ((error = readsuper(devfd, &fs, altsblock, 1, chkhash,
296 UFS_FREE(fs, filltype);
300 if (altsblock == STDSB_NOHASHFAIL)
302 for (i = 0; sblock_try[i] != -1; i++) {
303 if ((error = readsuper(devfd, &fs, sblock_try[i], 0,
304 chkhash, readfunc)) == 0)
307 UFS_FREE(fs, filltype);
314 if (sblock_try[i] == -1)
318 * Read in the superblock summary information.
320 size = fs->fs_cssize;
321 blks = howmany(size, fs->fs_fsize);
322 if (fs->fs_contigsumsize > 0)
323 size += fs->fs_ncg * sizeof(int32_t);
324 size += fs->fs_ncg * sizeof(u_int8_t);
325 /* When running in libufs or libsa, UFS_MALLOC may fail */
326 if ((space = UFS_MALLOC(size, filltype, M_WAITOK)) == NULL) {
327 UFS_FREE(fs, filltype);
330 fs->fs_csp = (struct csum *)space;
331 for (i = 0; i < blks; i += fs->fs_frag) {
333 if (i + fs->fs_frag > blks)
334 size = (blks - i) * fs->fs_fsize;
336 error = (*readfunc)(devfd,
337 dbtob(fsbtodb(fs, fs->fs_csaddr + i)), (void **)&buf, size);
340 UFS_FREE(buf, filltype);
341 UFS_FREE(fs->fs_csp, filltype);
342 UFS_FREE(fs, filltype);
345 memcpy(space, buf, size);
346 UFS_FREE(buf, filltype);
349 if (fs->fs_contigsumsize > 0) {
350 fs->fs_maxcluster = lp = (int32_t *)space;
351 for (i = 0; i < fs->fs_ncg; i++)
352 *lp++ = fs->fs_contigsumsize;
353 space = (uint8_t *)lp;
355 size = fs->fs_ncg * sizeof(u_int8_t);
356 fs->fs_contigdirs = (u_int8_t *)space;
357 bzero(fs->fs_contigdirs, size);
363 * Try to read a superblock from the location specified by sblockloc.
364 * Return zero on success or an errno on failure.
367 readsuper(void *devfd, struct fs **fsp, off_t sblockloc, int isaltsblk,
368 int chkhash, int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
374 error = (*readfunc)(devfd, sblockloc, (void **)fsp, SBLOCKSIZE);
378 if (fs->fs_magic == FS_BAD_MAGIC)
380 if (((fs->fs_magic == FS_UFS1_MAGIC && (isaltsblk ||
381 sblockloc <= SBLOCK_UFS1)) ||
382 (fs->fs_magic == FS_UFS2_MAGIC && (isaltsblk ||
383 sblockloc == fs->fs_sblockloc))) &&
385 fs->fs_bsize >= MINBSIZE &&
386 fs->fs_bsize <= MAXBSIZE &&
387 fs->fs_bsize >= roundup(sizeof(struct fs), DEV_BSIZE) &&
388 fs->fs_sbsize <= SBLOCKSIZE) {
390 * If the filesystem has been run on a kernel without
391 * metadata check hashes, disable them.
393 if ((fs->fs_flags & FS_METACKHASH) == 0)
394 fs->fs_metackhash = 0;
395 if (fs->fs_ckhash != (ckhash = ffs_calc_sbhash(fs))) {
397 res = uprintf("Superblock check-hash failed: recorded "
398 "check-hash 0x%x != computed check-hash 0x%x%s\n",
399 fs->fs_ckhash, ckhash,
400 chkhash == 0 ? " (Ignored)" : "");
405 * Print check-hash failure if no controlling terminal
406 * in kernel or always if in user-mode (libufs).
409 printf("Superblock check-hash failed: recorded "
410 "check-hash 0x%x != computed check-hash "
411 "0x%x%s\n", fs->fs_ckhash, ckhash,
412 chkhash == 0 ? " (Ignored)" : "");
414 fs->fs_flags |= FS_NEEDSFSCK;
421 /* Have to set for old filesystems that predate this field */
422 fs->fs_sblockactualloc = sblockloc;
423 /* Not yet any summary information */
431 * Write a superblock to the devfd device from the memory pointed to by fs.
432 * Write out the superblock summary information if it is present.
434 * If the write is successful, zero is returned. Otherwise one of the
435 * following error values is returned:
436 * EIO: failed to write superblock.
437 * EIO: failed to write superblock summary information.
440 ffs_sbput(void *devfd, struct fs *fs, off_t loc,
441 int (*writefunc)(void *devfd, off_t loc, void *buf, int size))
443 int i, error, blks, size;
447 * If there is summary information, write it first, so if there
448 * is an error, the superblock will not be marked as clean.
450 if (fs->fs_csp != NULL) {
451 blks = howmany(fs->fs_cssize, fs->fs_fsize);
452 space = (uint8_t *)fs->fs_csp;
453 for (i = 0; i < blks; i += fs->fs_frag) {
455 if (i + fs->fs_frag > blks)
456 size = (blks - i) * fs->fs_fsize;
457 if ((error = (*writefunc)(devfd,
458 dbtob(fsbtodb(fs, fs->fs_csaddr + i)),
465 fs->fs_time = UFS_TIME;
466 fs->fs_ckhash = ffs_calc_sbhash(fs);
467 if ((error = (*writefunc)(devfd, loc, fs, fs->fs_sbsize)) != 0)
473 * Calculate the check-hash for a superblock.
476 ffs_calc_sbhash(struct fs *fs)
478 uint32_t ckhash, save_ckhash;
481 * A filesystem that was using a superblock ckhash may be moved
482 * to an older kernel that does not support ckhashes. The
483 * older kernel will clear the FS_METACKHASH flag indicating
484 * that it does not update hashes. When the disk is moved back
485 * to a kernel capable of ckhashes it disables them on mount:
487 * if ((fs->fs_flags & FS_METACKHASH) == 0)
488 * fs->fs_metackhash = 0;
490 * This leaves (fs->fs_metackhash & CK_SUPERBLOCK) == 0) with an
491 * old stale value in the fs->fs_ckhash field. Thus the need to
492 * just accept what is there.
494 if ((fs->fs_metackhash & CK_SUPERBLOCK) == 0)
495 return (fs->fs_ckhash);
497 save_ckhash = fs->fs_ckhash;
500 * If newly read from disk, the caller is responsible for
501 * verifying that fs->fs_sbsize <= SBLOCKSIZE.
503 ckhash = calculate_crc32c(~0L, (void *)fs, fs->fs_sbsize);
504 fs->fs_ckhash = save_ckhash;
509 * Update the frsum fields to reflect addition or deletion
513 ffs_fragacct(struct fs *fs, int fragmap, int32_t fraglist[], int cnt)
519 inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
521 for (siz = 1; siz < fs->fs_frag; siz++) {
522 if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0)
525 subfield = inside[siz];
526 for (pos = siz; pos <= fs->fs_frag; pos++) {
527 if ((fragmap & field) == subfield) {
528 fraglist[siz] += cnt;
542 * check if a block is available
545 ffs_isblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
549 switch ((int)fs->fs_frag) {
551 return (cp[h] == 0xff);
553 mask = 0x0f << ((h & 0x1) << 2);
554 return ((cp[h >> 1] & mask) == mask);
556 mask = 0x03 << ((h & 0x3) << 1);
557 return ((cp[h >> 2] & mask) == mask);
559 mask = 0x01 << (h & 0x7);
560 return ((cp[h >> 3] & mask) == mask);
563 panic("ffs_isblock");
571 * check if a block is free
574 ffs_isfreeblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
577 switch ((int)fs->fs_frag) {
581 return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
583 return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
585 return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
588 panic("ffs_isfreeblock");
596 * take a block out of the map
599 ffs_clrblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
602 switch ((int)fs->fs_frag) {
607 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
610 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
613 cp[h >> 3] &= ~(0x01 << (h & 0x7));
617 panic("ffs_clrblock");
624 * put a block into the map
627 ffs_setblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
630 switch ((int)fs->fs_frag) {
636 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
639 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
642 cp[h >> 3] |= (0x01 << (h & 0x7));
646 panic("ffs_setblock");
653 * Update the cluster map because of an allocation or free.
655 * Cnt == 1 means free; cnt == -1 means allocating.
658 ffs_clusteracct(struct fs *fs, struct cg *cgp, ufs1_daddr_t blkno, int cnt)
662 u_char *freemapp, *mapp;
663 int i, start, end, forw, back, map;
666 if (fs->fs_contigsumsize <= 0)
668 freemapp = cg_clustersfree(cgp);
669 sump = cg_clustersum(cgp);
671 * Allocate or clear the actual block.
674 setbit(freemapp, blkno);
676 clrbit(freemapp, blkno);
678 * Find the size of the cluster going forward.
681 end = start + fs->fs_contigsumsize;
682 if (end >= cgp->cg_nclusterblks)
683 end = cgp->cg_nclusterblks;
684 mapp = &freemapp[start / NBBY];
686 bit = 1U << (start % NBBY);
687 for (i = start; i < end; i++) {
688 if ((map & bit) == 0)
690 if ((i & (NBBY - 1)) != (NBBY - 1)) {
699 * Find the size of the cluster going backward.
702 end = start - fs->fs_contigsumsize;
705 mapp = &freemapp[start / NBBY];
707 bit = 1U << (start % NBBY);
708 for (i = start; i > end; i--) {
709 if ((map & bit) == 0)
711 if ((i & (NBBY - 1)) != 0) {
715 bit = 1U << (NBBY - 1);
720 * Account for old cluster and the possibly new forward and
724 if (i > fs->fs_contigsumsize)
725 i = fs->fs_contigsumsize;
732 * Update cluster summary information.
734 lp = &sump[fs->fs_contigsumsize];
735 for (i = fs->fs_contigsumsize; i > 0; i--)
738 fs->fs_maxcluster[cgp->cg_cgx] = i;