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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
86 * Verify an inode check-hash.
89 ffs_verify_dinode_ckhash(struct fs *fs, struct ufs2_dinode *dip)
91 uint32_t ckhash, save_ckhash;
94 * Return success if unallocated or we are not doing inode check-hash.
96 if (dip->di_mode == 0 || (fs->fs_metackhash & CK_INODE) == 0)
99 * Exclude di_ckhash from the crc32 calculation, e.g., always use
100 * a check-hash value of zero when calculating the check-hash.
102 save_ckhash = dip->di_ckhash;
104 ckhash = calculate_crc32c(~0L, (void *)dip, sizeof(*dip));
105 dip->di_ckhash = save_ckhash;
106 if (save_ckhash == ckhash)
112 * Update an inode check-hash.
115 ffs_update_dinode_ckhash(struct fs *fs, struct ufs2_dinode *dip)
118 if (dip->di_mode == 0 || (fs->fs_metackhash & CK_INODE) == 0)
121 * Exclude old di_ckhash from the crc32 calculation, e.g., always use
122 * a check-hash value of zero when calculating the new check-hash.
125 dip->di_ckhash = calculate_crc32c(~0L, (void *)dip, sizeof(*dip));
129 * These are the low-level functions that actually read and write
130 * the superblock and its associated data.
132 static off_t sblock_try[] = SBLOCKSEARCH;
133 static int readsuper(void *, struct fs **, off_t, int, int,
134 int (*)(void *, off_t, void **, int));
137 * Read a superblock from the devfd device.
139 * If an alternate superblock is specified, it is read. Otherwise the
140 * set of locations given in the SBLOCKSEARCH list is searched for a
141 * superblock. Memory is allocated for the superblock by the readfunc and
142 * is returned. If filltype is non-NULL, additional memory is allocated
143 * of type filltype and filled in with the superblock summary information.
144 * All memory is freed when any error is returned.
146 * If a superblock is found, zero is returned. Otherwise one of the
147 * following error values is returned:
148 * EIO: non-existent or truncated superblock.
149 * EIO: error reading summary information.
150 * ENOENT: no usable known superblock found.
151 * ENOSPC: failed to allocate space for the superblock.
152 * EINVAL: The previous newfs operation on this volume did not complete.
153 * The administrator must complete newfs before using this volume.
156 ffs_sbget(void *devfd, struct fs **fsp, off_t altsblock,
157 struct malloc_type *filltype,
158 int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
161 int i, error, size, blks;
170 if (altsblock >= 0) {
171 if ((error = readsuper(devfd, &fs, altsblock, 1, chkhash,
174 UFS_FREE(fs, filltype);
178 if (altsblock == STDSB_NOHASHFAIL)
180 for (i = 0; sblock_try[i] != -1; i++) {
181 if ((error = readsuper(devfd, &fs, sblock_try[i], 0,
182 chkhash, readfunc)) == 0)
185 UFS_FREE(fs, filltype);
192 if (sblock_try[i] == -1)
196 * Read in the superblock summary information.
198 size = fs->fs_cssize;
199 blks = howmany(size, fs->fs_fsize);
200 if (fs->fs_contigsumsize > 0)
201 size += fs->fs_ncg * sizeof(int32_t);
202 size += fs->fs_ncg * sizeof(u_int8_t);
203 /* When running in libufs or libsa, UFS_MALLOC may fail */
204 if ((space = UFS_MALLOC(size, filltype, M_WAITOK)) == NULL) {
205 UFS_FREE(fs, filltype);
208 fs->fs_csp = (struct csum *)space;
209 for (i = 0; i < blks; i += fs->fs_frag) {
211 if (i + fs->fs_frag > blks)
212 size = (blks - i) * fs->fs_fsize;
214 error = (*readfunc)(devfd,
215 dbtob(fsbtodb(fs, fs->fs_csaddr + i)), (void **)&buf, size);
218 UFS_FREE(buf, filltype);
219 UFS_FREE(fs->fs_csp, filltype);
220 UFS_FREE(fs, filltype);
223 memcpy(space, buf, size);
224 UFS_FREE(buf, filltype);
227 if (fs->fs_contigsumsize > 0) {
228 fs->fs_maxcluster = lp = (int32_t *)space;
229 for (i = 0; i < fs->fs_ncg; i++)
230 *lp++ = fs->fs_contigsumsize;
231 space = (uint8_t *)lp;
233 size = fs->fs_ncg * sizeof(u_int8_t);
234 fs->fs_contigdirs = (u_int8_t *)space;
235 bzero(fs->fs_contigdirs, size);
241 * Try to read a superblock from the location specified by sblockloc.
242 * Return zero on success or an errno on failure.
245 readsuper(void *devfd, struct fs **fsp, off_t sblockloc, int isaltsblk,
246 int chkhash, int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
252 error = (*readfunc)(devfd, sblockloc, (void **)fsp, SBLOCKSIZE);
256 if (fs->fs_magic == FS_BAD_MAGIC)
258 if (((fs->fs_magic == FS_UFS1_MAGIC && (isaltsblk ||
259 sblockloc <= SBLOCK_UFS1)) ||
260 (fs->fs_magic == FS_UFS2_MAGIC && (isaltsblk ||
261 sblockloc == fs->fs_sblockloc))) &&
263 fs->fs_bsize >= MINBSIZE &&
264 fs->fs_bsize <= MAXBSIZE &&
265 fs->fs_bsize >= roundup(sizeof(struct fs), DEV_BSIZE) &&
266 fs->fs_sbsize <= SBLOCKSIZE) {
268 * If the filesystem has been run on a kernel without
269 * metadata check hashes, disable them.
271 if ((fs->fs_flags & FS_METACKHASH) == 0)
272 fs->fs_metackhash = 0;
273 if (fs->fs_ckhash != (ckhash = ffs_calc_sbhash(fs))) {
275 res = uprintf("Superblock check-hash failed: recorded "
276 "check-hash 0x%x != computed check-hash 0x%x%s\n",
277 fs->fs_ckhash, ckhash,
278 chkhash == 0 ? " (Ignored)" : "");
283 * Print check-hash failure if no controlling terminal
284 * in kernel or always if in user-mode (libufs).
287 printf("Superblock check-hash failed: recorded "
288 "check-hash 0x%x != computed check-hash "
289 "0x%x%s\n", fs->fs_ckhash, ckhash,
290 chkhash == 0 ? " (Ignored)" : "");
292 fs->fs_flags |= FS_NEEDSFSCK;
299 /* Have to set for old filesystems that predate this field */
300 fs->fs_sblockactualloc = sblockloc;
301 /* Not yet any summary information */
309 * Write a superblock to the devfd device from the memory pointed to by fs.
310 * Write out the superblock summary information if it is present.
312 * If the write is successful, zero is returned. Otherwise one of the
313 * following error values is returned:
314 * EIO: failed to write superblock.
315 * EIO: failed to write superblock summary information.
318 ffs_sbput(void *devfd, struct fs *fs, off_t loc,
319 int (*writefunc)(void *devfd, off_t loc, void *buf, int size))
321 int i, error, blks, size;
325 * If there is summary information, write it first, so if there
326 * is an error, the superblock will not be marked as clean.
328 if (fs->fs_csp != NULL) {
329 blks = howmany(fs->fs_cssize, fs->fs_fsize);
330 space = (uint8_t *)fs->fs_csp;
331 for (i = 0; i < blks; i += fs->fs_frag) {
333 if (i + fs->fs_frag > blks)
334 size = (blks - i) * fs->fs_fsize;
335 if ((error = (*writefunc)(devfd,
336 dbtob(fsbtodb(fs, fs->fs_csaddr + i)),
343 fs->fs_time = UFS_TIME;
344 fs->fs_ckhash = ffs_calc_sbhash(fs);
345 if ((error = (*writefunc)(devfd, loc, fs, fs->fs_sbsize)) != 0)
351 * Calculate the check-hash for a superblock.
354 ffs_calc_sbhash(struct fs *fs)
356 uint32_t ckhash, save_ckhash;
359 * A filesystem that was using a superblock ckhash may be moved
360 * to an older kernel that does not support ckhashes. The
361 * older kernel will clear the FS_METACKHASH flag indicating
362 * that it does not update hashes. When the disk is moved back
363 * to a kernel capable of ckhashes it disables them on mount:
365 * if ((fs->fs_flags & FS_METACKHASH) == 0)
366 * fs->fs_metackhash = 0;
368 * This leaves (fs->fs_metackhash & CK_SUPERBLOCK) == 0) with an
369 * old stale value in the fs->fs_ckhash field. Thus the need to
370 * just accept what is there.
372 if ((fs->fs_metackhash & CK_SUPERBLOCK) == 0)
373 return (fs->fs_ckhash);
375 save_ckhash = fs->fs_ckhash;
378 * If newly read from disk, the caller is responsible for
379 * verifying that fs->fs_sbsize <= SBLOCKSIZE.
381 ckhash = calculate_crc32c(~0L, (void *)fs, fs->fs_sbsize);
382 fs->fs_ckhash = save_ckhash;
387 * Update the frsum fields to reflect addition or deletion
391 ffs_fragacct(struct fs *fs, int fragmap, int32_t fraglist[], int cnt)
397 inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
399 for (siz = 1; siz < fs->fs_frag; siz++) {
400 if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0)
403 subfield = inside[siz];
404 for (pos = siz; pos <= fs->fs_frag; pos++) {
405 if ((fragmap & field) == subfield) {
406 fraglist[siz] += cnt;
420 * check if a block is available
423 ffs_isblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
427 switch ((int)fs->fs_frag) {
429 return (cp[h] == 0xff);
431 mask = 0x0f << ((h & 0x1) << 2);
432 return ((cp[h >> 1] & mask) == mask);
434 mask = 0x03 << ((h & 0x3) << 1);
435 return ((cp[h >> 2] & mask) == mask);
437 mask = 0x01 << (h & 0x7);
438 return ((cp[h >> 3] & mask) == mask);
441 panic("ffs_isblock");
449 * check if a block is free
452 ffs_isfreeblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
455 switch ((int)fs->fs_frag) {
459 return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
461 return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
463 return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
466 panic("ffs_isfreeblock");
474 * take a block out of the map
477 ffs_clrblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
480 switch ((int)fs->fs_frag) {
485 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
488 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
491 cp[h >> 3] &= ~(0x01 << (h & 0x7));
495 panic("ffs_clrblock");
502 * put a block into the map
505 ffs_setblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
508 switch ((int)fs->fs_frag) {
514 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
517 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
520 cp[h >> 3] |= (0x01 << (h & 0x7));
524 panic("ffs_setblock");
531 * Update the cluster map because of an allocation or free.
533 * Cnt == 1 means free; cnt == -1 means allocating.
536 ffs_clusteracct(struct fs *fs, struct cg *cgp, ufs1_daddr_t blkno, int cnt)
540 u_char *freemapp, *mapp;
541 int i, start, end, forw, back, map;
544 if (fs->fs_contigsumsize <= 0)
546 freemapp = cg_clustersfree(cgp);
547 sump = cg_clustersum(cgp);
549 * Allocate or clear the actual block.
552 setbit(freemapp, blkno);
554 clrbit(freemapp, blkno);
556 * Find the size of the cluster going forward.
559 end = start + fs->fs_contigsumsize;
560 if (end >= cgp->cg_nclusterblks)
561 end = cgp->cg_nclusterblks;
562 mapp = &freemapp[start / NBBY];
564 bit = 1U << (start % NBBY);
565 for (i = start; i < end; i++) {
566 if ((map & bit) == 0)
568 if ((i & (NBBY - 1)) != (NBBY - 1)) {
577 * Find the size of the cluster going backward.
580 end = start - fs->fs_contigsumsize;
583 mapp = &freemapp[start / NBBY];
585 bit = 1U << (start % NBBY);
586 for (i = start; i > end; i--) {
587 if ((map & bit) == 0)
589 if ((i & (NBBY - 1)) != 0) {
593 bit = 1U << (NBBY - 1);
598 * Account for old cluster and the possibly new forward and
602 if (i > fs->fs_contigsumsize)
603 i = fs->fs_contigsumsize;
610 * Update cluster summary information.
612 lp = &sump[fs->fs_contigsumsize];
613 for (i = fs->fs_contigsumsize; i > 0; i--)
616 fs->fs_maxcluster[cgp->cg_cgx] = i;