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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);
50 #define UFS_MALLOC(size, type, flags) malloc(size)
51 #define UFS_FREE(ptr, type) free(ptr)
52 #define UFS_TIME time(NULL)
55 #include <sys/systm.h>
57 #include <sys/malloc.h>
58 #include <sys/mount.h>
59 #include <sys/vnode.h>
62 #include <sys/ucred.h>
64 #include <ufs/ufs/quota.h>
65 #include <ufs/ufs/inode.h>
66 #include <ufs/ufs/extattr.h>
67 #include <ufs/ufs/ufsmount.h>
68 #include <ufs/ufs/ufs_extern.h>
69 #include <ufs/ffs/ffs_extern.h>
70 #include <ufs/ffs/fs.h>
72 #define UFS_MALLOC(size, type, flags) malloc(size, type, flags)
73 #define UFS_FREE(ptr, type) free(ptr, type)
74 #define UFS_TIME time_second
77 * Return buffer with the contents of block "offset" from the beginning of
78 * directory "ip". If "res" is non-zero, fill it in with a pointer to the
79 * remaining space in the directory.
82 ffs_blkatoff(struct vnode *vp, off_t offset, char **res, struct buf **bpp)
92 lbn = lblkno(fs, offset);
93 bsize = blksize(fs, ip, lbn);
96 error = bread(vp, lbn, bsize, NOCRED, &bp);
102 *res = (char *)bp->b_data + blkoff(fs, offset);
108 * Load up the contents of an inode and copy the appropriate pieces
109 * to the incore copy.
112 ffs_load_inode(struct buf *bp, struct inode *ip, struct fs *fs, ino_t ino)
117 *((struct ufs1_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
118 ip->i_mode = ip->i_din1->di_mode;
119 ip->i_nlink = ip->i_din1->di_nlink;
120 ip->i_size = ip->i_din1->di_size;
121 ip->i_flags = ip->i_din1->di_flags;
122 ip->i_gen = ip->i_din1->di_gen;
123 ip->i_uid = ip->i_din1->di_uid;
124 ip->i_gid = ip->i_din1->di_gid;
127 *((struct ufs2_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
128 ip->i_mode = ip->i_din2->di_mode;
129 ip->i_nlink = ip->i_din2->di_nlink;
130 ip->i_size = ip->i_din2->di_size;
131 ip->i_flags = ip->i_din2->di_flags;
132 ip->i_gen = ip->i_din2->di_gen;
133 ip->i_uid = ip->i_din2->di_uid;
134 ip->i_gid = ip->i_din2->di_gid;
140 * These are the low-level functions that actually read and write
141 * the superblock and its associated data.
143 static off_t sblock_try[] = SBLOCKSEARCH;
144 static int readsuper(void *, struct fs **, off_t, int,
145 int (*)(void *, off_t, void **, int));
146 static uint32_t calc_sbhash(struct fs *);
149 * Read a superblock from the devfd device.
151 * If an alternate superblock is specified, it is read. Otherwise the
152 * set of locations given in the SBLOCKSEARCH list is searched for a
153 * superblock. Memory is allocated for the superblock by the readfunc and
154 * is returned. If filltype is non-NULL, additional memory is allocated
155 * of type filltype and filled in with the superblock summary information.
156 * All memory is freed when any error is returned.
158 * If a superblock is found, zero is returned. Otherwise one of the
159 * following error values is returned:
160 * EIO: non-existent or truncated superblock.
161 * EIO: error reading summary information.
162 * ENOENT: no usable known superblock found.
163 * ENOSPC: failed to allocate space for the superblock.
164 * EINVAL: The previous newfs operation on this volume did not complete.
165 * The administrator must complete newfs before using this volume.
168 ffs_sbget(void *devfd, struct fs **fsp, off_t altsblock,
169 struct malloc_type *filltype,
170 int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
173 int i, error, size, blks;
180 if (altsblock != -1) {
181 if ((error = readsuper(devfd, &fs, altsblock, 1,
184 UFS_FREE(fs, filltype);
188 for (i = 0; sblock_try[i] != -1; i++) {
189 if ((error = readsuper(devfd, &fs, sblock_try[i], 0,
193 UFS_FREE(fs, filltype);
200 if (sblock_try[i] == -1)
204 * Read in the superblock summary information.
206 size = fs->fs_cssize;
207 blks = howmany(size, fs->fs_fsize);
208 if (fs->fs_contigsumsize > 0)
209 size += fs->fs_ncg * sizeof(int32_t);
210 size += fs->fs_ncg * sizeof(u_int8_t);
211 /* When running in libufs or libsa, UFS_MALLOC may fail */
212 if ((space = UFS_MALLOC(size, filltype, M_WAITOK)) == NULL) {
213 UFS_FREE(fs, filltype);
216 fs->fs_csp = (struct csum *)space;
217 for (i = 0; i < blks; i += fs->fs_frag) {
219 if (i + fs->fs_frag > blks)
220 size = (blks - i) * fs->fs_fsize;
222 error = (*readfunc)(devfd,
223 dbtob(fsbtodb(fs, fs->fs_csaddr + i)), (void **)&buf, size);
226 UFS_FREE(buf, filltype);
227 UFS_FREE(fs->fs_csp, filltype);
228 UFS_FREE(fs, filltype);
231 memcpy(space, buf, size);
232 UFS_FREE(buf, filltype);
235 if (fs->fs_contigsumsize > 0) {
236 fs->fs_maxcluster = lp = (int32_t *)space;
237 for (i = 0; i < fs->fs_ncg; i++)
238 *lp++ = fs->fs_contigsumsize;
239 space = (uint8_t *)lp;
241 size = fs->fs_ncg * sizeof(u_int8_t);
242 fs->fs_contigdirs = (u_int8_t *)space;
243 bzero(fs->fs_contigdirs, size);
249 * Try to read a superblock from the location specified by sblockloc.
250 * Return zero on success or an errno on failure.
253 readsuper(void *devfd, struct fs **fsp, off_t sblockloc, int isaltsblk,
254 int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
260 error = (*readfunc)(devfd, sblockloc, (void **)fsp, SBLOCKSIZE);
264 if (fs->fs_magic == FS_BAD_MAGIC)
266 if (((fs->fs_magic == FS_UFS1_MAGIC && (isaltsblk ||
267 sblockloc <= SBLOCK_UFS1)) ||
268 (fs->fs_magic == FS_UFS2_MAGIC && (isaltsblk ||
269 sblockloc == fs->fs_sblockloc))) &&
271 fs->fs_bsize >= MINBSIZE &&
272 fs->fs_bsize <= MAXBSIZE &&
273 fs->fs_bsize >= roundup(sizeof(struct fs), DEV_BSIZE) &&
274 fs->fs_sbsize <= SBLOCKSIZE) {
275 if (fs->fs_ckhash != (ckhash = calc_sbhash(fs))) {
277 res = uprintf("Superblock check-hash failed: recorded "
278 "check-hash 0x%x != computed check-hash 0x%x\n",
279 fs->fs_ckhash, ckhash);
284 * Print check-hash failure if no controlling terminal
285 * in kernel or always if in user-mode (libufs).
288 printf("Superblock check-hash failed: recorded "
289 "check-hash 0x%x != computed check-hash "
290 "0x%x\n", fs->fs_ckhash, ckhash);
293 /* Have to set for old filesystems that predate this field */
294 fs->fs_sblockactualloc = sblockloc;
295 /* Not yet any summary information */
303 * Write a superblock to the devfd device from the memory pointed to by fs.
304 * Write out the superblock summary information if it is present.
306 * If the write is successful, zero is returned. Otherwise one of the
307 * following error values is returned:
308 * EIO: failed to write superblock.
309 * EIO: failed to write superblock summary information.
312 ffs_sbput(void *devfd, struct fs *fs, off_t loc,
313 int (*writefunc)(void *devfd, off_t loc, void *buf, int size))
315 int i, error, blks, size;
319 * If there is summary information, write it first, so if there
320 * is an error, the superblock will not be marked as clean.
322 if (fs->fs_csp != NULL) {
323 blks = howmany(fs->fs_cssize, fs->fs_fsize);
324 space = (uint8_t *)fs->fs_csp;
325 for (i = 0; i < blks; i += fs->fs_frag) {
327 if (i + fs->fs_frag > blks)
328 size = (blks - i) * fs->fs_fsize;
329 if ((error = (*writefunc)(devfd,
330 dbtob(fsbtodb(fs, fs->fs_csaddr + i)),
337 fs->fs_time = UFS_TIME;
338 fs->fs_ckhash = calc_sbhash(fs);
339 if ((error = (*writefunc)(devfd, loc, fs, fs->fs_sbsize)) != 0)
345 * Calculate the check-hash for a superblock.
348 calc_sbhash(struct fs *fs)
350 uint32_t ckhash, save_ckhash;
353 * A filesystem that was using a superblock ckhash may be moved
354 * to an older kernel that does not support ckhashes. The
355 * older kernel will clear the FS_METACKHASH flag indicating
356 * that it does not update hashes. When the disk is moved back
357 * to a kernel capable of ckhashes it disables them on mount:
359 * if ((fs->fs_flags & FS_METACKHASH) == 0)
360 * fs->fs_metackhash = 0;
362 * This leaves (fs->fs_metackhash & CK_SUPERBLOCK) == 0) with an
363 * old stale value in the fs->fs_ckhash field. Thus the need to
364 * just accept what is there.
366 if ((fs->fs_metackhash & CK_SUPERBLOCK) == 0)
367 return (fs->fs_ckhash);
369 save_ckhash = fs->fs_ckhash;
372 * If newly read from disk, the caller is responsible for
373 * verifying that fs->fs_sbsize <= SBLOCKSIZE.
375 ckhash = calculate_crc32c(~0L, (void *)fs, fs->fs_sbsize);
376 fs->fs_ckhash = save_ckhash;
381 * Update the frsum fields to reflect addition or deletion
385 ffs_fragacct(struct fs *fs, int fragmap, int32_t fraglist[], int cnt)
391 inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
393 for (siz = 1; siz < fs->fs_frag; siz++) {
394 if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0)
397 subfield = inside[siz];
398 for (pos = siz; pos <= fs->fs_frag; pos++) {
399 if ((fragmap & field) == subfield) {
400 fraglist[siz] += cnt;
414 * check if a block is available
417 ffs_isblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
421 switch ((int)fs->fs_frag) {
423 return (cp[h] == 0xff);
425 mask = 0x0f << ((h & 0x1) << 2);
426 return ((cp[h >> 1] & mask) == mask);
428 mask = 0x03 << ((h & 0x3) << 1);
429 return ((cp[h >> 2] & mask) == mask);
431 mask = 0x01 << (h & 0x7);
432 return ((cp[h >> 3] & mask) == mask);
435 panic("ffs_isblock");
443 * check if a block is free
446 ffs_isfreeblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
449 switch ((int)fs->fs_frag) {
453 return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
455 return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
457 return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
460 panic("ffs_isfreeblock");
468 * take a block out of the map
471 ffs_clrblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
474 switch ((int)fs->fs_frag) {
479 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
482 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
485 cp[h >> 3] &= ~(0x01 << (h & 0x7));
489 panic("ffs_clrblock");
496 * put a block into the map
499 ffs_setblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
502 switch ((int)fs->fs_frag) {
508 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
511 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
514 cp[h >> 3] |= (0x01 << (h & 0x7));
518 panic("ffs_setblock");
525 * Update the cluster map because of an allocation or free.
527 * Cnt == 1 means free; cnt == -1 means allocating.
530 ffs_clusteracct(struct fs *fs, struct cg *cgp, ufs1_daddr_t blkno, int cnt)
534 u_char *freemapp, *mapp;
535 int i, start, end, forw, back, map;
538 if (fs->fs_contigsumsize <= 0)
540 freemapp = cg_clustersfree(cgp);
541 sump = cg_clustersum(cgp);
543 * Allocate or clear the actual block.
546 setbit(freemapp, blkno);
548 clrbit(freemapp, blkno);
550 * Find the size of the cluster going forward.
553 end = start + fs->fs_contigsumsize;
554 if (end >= cgp->cg_nclusterblks)
555 end = cgp->cg_nclusterblks;
556 mapp = &freemapp[start / NBBY];
558 bit = 1U << (start % NBBY);
559 for (i = start; i < end; i++) {
560 if ((map & bit) == 0)
562 if ((i & (NBBY - 1)) != (NBBY - 1)) {
571 * Find the size of the cluster going backward.
574 end = start - fs->fs_contigsumsize;
577 mapp = &freemapp[start / NBBY];
579 bit = 1U << (start % NBBY);
580 for (i = start; i > end; i--) {
581 if ((map & bit) == 0)
583 if ((i & (NBBY - 1)) != 0) {
587 bit = 1U << (NBBY - 1);
592 * Account for old cluster and the possibly new forward and
596 if (i > fs->fs_contigsumsize)
597 i = fs->fs_contigsumsize;
604 * Update cluster summary information.
606 lp = &sump[fs->fs_contigsumsize];
607 for (i = fs->fs_contigsumsize; i > 0; i--)
610 fs->fs_maxcluster[cgp->cg_cgx] = i;