2 * Copyright (c) 1980, 1988, 1991, 1993
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32 static char sccsid[] = "@(#)traverse.c 8.7 (Berkeley) 6/15/95";
34 static const char rcsid[] =
38 #include <sys/param.h>
41 #include <ufs/ufs/dir.h>
42 #include <ufs/ufs/dinode.h>
43 #include <ufs/ffs/fs.h>
45 #include <protocols/dumprestore.h>
60 struct ufs1_dinode dp1;
61 struct ufs2_dinode dp2;
63 #define DIP(dp, field) \
64 ((sblock->fs_magic == FS_UFS1_MAGIC) ? \
65 (dp)->dp1.field : (dp)->dp2.field)
66 #define DIP_SET(dp, field, val) do {\
67 if (sblock->fs_magic == FS_UFS1_MAGIC) \
68 (dp)->dp1.field = (val); \
70 (dp)->dp2.field = (val); \
73 #define HASDUMPEDFILE 0x1
74 #define HASSUBDIRS 0x2
76 static int dirindir(ino_t ino, ufs2_daddr_t blkno, int level, long *size,
77 long *tapesize, int nodump, ino_t maxino);
78 static void dmpindir(union dinode *dp, ino_t ino, ufs2_daddr_t blk, int level,
80 static void ufs1_blksout(ufs1_daddr_t *blkp, int frags, ino_t ino);
81 static void ufs2_blksout(union dinode *dp, ufs2_daddr_t *blkp, int frags,
83 static int appendextdata(union dinode *dp);
84 static void writeextdata(union dinode *dp, ino_t ino, int added);
85 static int searchdir(ino_t ino, ufs2_daddr_t blkno, long size, long filesize,
86 long *tapesize, int nodump, ino_t maxino);
87 static long blockest(union dinode *dp);
90 * This is an estimation of the number of TP_BSIZE blocks in the file.
91 * It estimates the number of blocks in files with holes by assuming
92 * that all of the blocks accounted for by di_blocks are data blocks
93 * (when some of the blocks are usually used for indirect pointers);
94 * hence the estimate may be high.
97 blockest(union dinode *dp)
102 * dp->di_size is the size of the file in bytes.
103 * dp->di_blocks stores the number of sectors actually in the file.
104 * If there are more sectors than the size would indicate, this just
105 * means that there are indirect blocks in the file or unused
106 * sectors in the last file block; we can safely ignore these
107 * (blkest = sizeest below).
108 * If the file is bigger than the number of sectors would indicate,
109 * then the file has holes in it. In this case we must use the
110 * block count to estimate the number of data blocks used, but
111 * we use the actual size for estimating the number of indirect
112 * dump blocks (sizeest vs. blkest in the indirect block
115 if ((DIP(dp, di_flags) & SF_SNAPSHOT) != 0)
117 blkest = howmany(dbtob(DIP(dp, di_blocks)), TP_BSIZE);
118 sizeest = howmany(DIP(dp, di_size), TP_BSIZE);
119 if (blkest > sizeest)
121 if (DIP(dp, di_size) > sblock->fs_bsize * NDADDR) {
122 /* calculate the number of indirect blocks on the dump tape */
124 howmany(sizeest - NDADDR * sblock->fs_bsize / TP_BSIZE,
130 /* Auxiliary macro to pick up files changed since previous dump. */
131 #define CHANGEDSINCE(dp, t) \
132 (DIP(dp, di_mtime) >= (t) || DIP(dp, di_ctime) >= (t))
134 /* The WANTTODUMP macro decides whether a file should be dumped. */
136 #define WANTTODUMP(dp) \
137 (CHANGEDSINCE(dp, spcl.c_ddate) && \
138 (nonodump || (DIP(dp, di_flags) & UF_NODUMP) != UF_NODUMP))
140 #define WANTTODUMP(dp) CHANGEDSINCE(dp, spcl.c_ddate)
146 * Walk the inode list for a file system to find all allocated inodes
147 * that have been modified since the previous dump time. Also, find all
148 * the directories in the file system.
151 mapfiles(ino_t maxino, long *tapesize)
153 int i, cg, mode, inosused;
154 int anydirskipped = 0;
160 if ((cgp = malloc(sblock->fs_cgsize)) == NULL)
161 quit("mapfiles: cannot allocate memory.\n");
162 for (cg = 0; cg < sblock->fs_ncg; cg++) {
163 ino = cg * sblock->fs_ipg;
164 bread(fsbtodb(sblock, cgtod(sblock, cg)), (char *)cgp,
166 if (sblock->fs_magic == FS_UFS2_MAGIC)
167 inosused = cgp->cg_initediblk;
169 inosused = sblock->fs_ipg;
171 * If we are using soft updates, then we can trust the
172 * cylinder group inode allocation maps to tell us which
173 * inodes are allocated. We will scan the used inode map
174 * to find the inodes that are really in use, and then
175 * read only those inodes in from disk.
177 if (sblock->fs_flags & FS_DOSOFTDEP) {
178 if (!cg_chkmagic(cgp))
179 quit("mapfiles: cg %d: bad magic number\n", cg);
180 cp = &cg_inosused(cgp)[(inosused - 1) / CHAR_BIT];
181 for ( ; inosused > 0; inosused -= CHAR_BIT, cp--) {
184 for (i = 1 << (CHAR_BIT - 1); i > 0; i >>= 1) {
194 for (i = 0; i < inosused; i++, ino++) {
196 (dp = getino(ino, &mode)) == NULL ||
200 msg("Skipping inode %d >= maxino %d\n",
205 * Everything must go in usedinomap so that a check
206 * for "in dumpdirmap but not in usedinomap" to detect
207 * dirs with nodump set has a chance of succeeding
208 * (this is used in mapdirs()).
210 SETINO(ino, usedinomap);
212 SETINO(ino, dumpdirmap);
213 if (WANTTODUMP(dp)) {
214 SETINO(ino, dumpinomap);
220 *tapesize += blockest(dp);
225 (DIP(dp, di_flags) & UF_NODUMP))
226 CLRINO(ino, usedinomap);
232 * Restore gets very upset if the root is not dumped,
233 * so ensure that it always is dumped.
235 SETINO(ROOTINO, dumpinomap);
236 return (anydirskipped);
242 * Scan each directory on the file system to see if it has any modified
243 * files in it. If it does, and has not already been added to the dump
244 * list (because it was itself modified), then add it. If a directory
245 * has not been modified itself, contains no modified files and has no
246 * subdirectories, then it can be deleted from the dump list and from
247 * the list of directories. By deleting it from the list of directories,
248 * its parent may now qualify for the same treatment on this or a later
249 * pass using this algorithm.
252 mapdirs(ino_t maxino, long *tapesize)
255 int i, isdir, nodump;
262 isdir = 0; /* XXX just to get gcc to shut up */
263 for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
264 if (((ino - 1) % CHAR_BIT) == 0) /* map is offset by 1 */
269 * If a directory has been removed from usedinomap, it
270 * either has the nodump flag set, or has inherited
271 * it. Although a directory can't be in dumpinomap if
272 * it isn't in usedinomap, we have to go through it to
273 * propagate the nodump flag.
275 nodump = !nonodump && (TSTINO(ino, usedinomap) == 0);
276 if ((isdir & 1) == 0 || (TSTINO(ino, dumpinomap) && !nodump))
278 dp = getino(ino, &i);
280 * inode buf may change in searchdir().
282 if (sblock->fs_magic == FS_UFS1_MAGIC)
286 filesize = DIP(&di, di_size);
287 for (ret = 0, i = 0; filesize > 0 && i < NDADDR; i++) {
288 if (DIP(&di, di_db[i]) != 0)
289 ret |= searchdir(ino, DIP(&di, di_db[i]),
290 (long)sblksize(sblock, DIP(&di, di_size),
291 i), filesize, tapesize, nodump, maxino);
292 if (ret & HASDUMPEDFILE)
295 filesize -= sblock->fs_bsize;
297 for (i = 0; filesize > 0 && i < NIADDR; i++) {
298 if (DIP(&di, di_ib[i]) == 0)
300 ret |= dirindir(ino, DIP(&di, di_ib[i]), i, &filesize,
301 tapesize, nodump, maxino);
303 if (ret & HASDUMPEDFILE) {
304 SETINO(ino, dumpinomap);
305 *tapesize += blockest(&di);
310 if (ret & HASSUBDIRS)
311 change = 1; /* subdirs inherit nodump */
312 CLRINO(ino, dumpdirmap);
313 } else if ((ret & HASSUBDIRS) == 0)
314 if (!TSTINO(ino, dumpinomap)) {
315 CLRINO(ino, dumpdirmap);
323 * Read indirect blocks, and pass the data blocks to be searched
324 * as directories. Quit as soon as any entry is found that will
325 * require the directory to be dumped.
338 ufs1_daddr_t ufs1[MAXBSIZE / sizeof(ufs1_daddr_t)];
339 ufs2_daddr_t ufs2[MAXBSIZE / sizeof(ufs2_daddr_t)];
344 bread(fsbtodb(sblock, blkno), (char *)&idblk, (int)sblock->fs_bsize);
345 if (ind_level <= 0) {
346 for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) {
347 if (sblock->fs_magic == FS_UFS1_MAGIC)
348 blkno = idblk.ufs1[i];
350 blkno = idblk.ufs2[i];
352 ret |= searchdir(ino, blkno, sblock->fs_bsize,
353 *filesize, tapesize, nodump, maxino);
354 if (ret & HASDUMPEDFILE)
357 *filesize -= sblock->fs_bsize;
362 for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) {
363 if (sblock->fs_magic == FS_UFS1_MAGIC)
364 blkno = idblk.ufs1[i];
366 blkno = idblk.ufs2[i];
368 ret |= dirindir(ino, blkno, ind_level, filesize,
369 tapesize, nodump, maxino);
375 * Scan a disk block containing directory information looking to see if
376 * any of the entries are on the dump list and to see if the directory
377 * contains any subdirectories.
395 if (dblk == NULL && (dblk = malloc(sblock->fs_bsize)) == NULL)
396 quit("searchdir: cannot allocate indirect memory.\n");
397 bread(fsbtodb(sblock, blkno), dblk, (int)size);
400 for (loc = 0; loc < size; ) {
401 dp = (struct direct *)(dblk + loc);
402 if (dp->d_reclen == 0) {
403 msg("corrupted directory, inumber %d\n", ino);
409 if (dp->d_ino >= maxino) {
410 msg("corrupted directory entry, d_ino %d >= %d\n",
414 if (dp->d_name[0] == '.') {
415 if (dp->d_name[1] == '\0')
417 if (dp->d_name[1] == '.' && dp->d_name[2] == '\0')
421 ip = getino(dp->d_ino, &mode);
422 if (TSTINO(dp->d_ino, dumpinomap)) {
423 CLRINO(dp->d_ino, dumpinomap);
424 *tapesize -= blockest(ip);
427 * Add back to dumpdirmap and remove from usedinomap
428 * to propagate nodump.
431 SETINO(dp->d_ino, dumpdirmap);
432 CLRINO(dp->d_ino, usedinomap);
436 if (TSTINO(dp->d_ino, dumpinomap)) {
437 ret |= HASDUMPEDFILE;
438 if (ret & HASSUBDIRS)
441 if (TSTINO(dp->d_ino, dumpdirmap)) {
443 if (ret & HASDUMPEDFILE)
452 * Dump passes 3 and 4.
454 * Dump the contents of an inode to tape.
457 dumpino(union dinode *dp, ino_t ino)
459 int ind_level, cnt, last, added;
465 dumpmap(dumpinomap, TS_BITS, ino);
467 CLRINO(ino, dumpinomap);
469 * Zero out the size of a snapshot so that it will be dumped
470 * as a zero length file.
472 if ((DIP(dp, di_flags) & SF_SNAPSHOT) != 0) {
473 DIP_SET(dp, di_size, 0);
474 DIP_SET(dp, di_flags, DIP(dp, di_flags) & ~SF_SNAPSHOT);
476 if (sblock->fs_magic == FS_UFS1_MAGIC) {
477 spcl.c_mode = dp->dp1.di_mode;
478 spcl.c_size = dp->dp1.di_size;
480 spcl.c_atime = _time32_to_time(dp->dp1.di_atime);
481 spcl.c_atimensec = dp->dp1.di_atimensec;
482 spcl.c_mtime = _time32_to_time(dp->dp1.di_mtime);
483 spcl.c_mtimensec = dp->dp1.di_mtimensec;
484 spcl.c_birthtime = 0;
485 spcl.c_birthtimensec = 0;
486 spcl.c_rdev = dp->dp1.di_rdev;
487 spcl.c_file_flags = dp->dp1.di_flags;
488 spcl.c_uid = dp->dp1.di_uid;
489 spcl.c_gid = dp->dp1.di_gid;
491 spcl.c_mode = dp->dp2.di_mode;
492 spcl.c_size = dp->dp2.di_size;
493 spcl.c_extsize = dp->dp2.di_extsize;
494 spcl.c_atime = _time64_to_time(dp->dp2.di_atime);
495 spcl.c_atimensec = dp->dp2.di_atimensec;
496 spcl.c_mtime = _time64_to_time(dp->dp2.di_mtime);
497 spcl.c_mtimensec = dp->dp2.di_mtimensec;
498 spcl.c_birthtime = _time64_to_time(dp->dp2.di_birthtime);
499 spcl.c_birthtimensec = dp->dp2.di_birthnsec;
500 spcl.c_rdev = dp->dp2.di_rdev;
501 spcl.c_file_flags = dp->dp2.di_flags;
502 spcl.c_uid = dp->dp2.di_uid;
503 spcl.c_gid = dp->dp2.di_gid;
505 spcl.c_type = TS_INODE;
507 switch (DIP(dp, di_mode) & S_IFMT) {
517 * Check for short symbolic link.
519 if (DIP(dp, di_size) > 0 &&
520 DIP(dp, di_size) < sblock->fs_maxsymlinklen) {
523 added = appendextdata(dp);
525 if (sblock->fs_magic == FS_UFS1_MAGIC)
526 memmove(buf, (caddr_t)dp->dp1.di_db,
527 (u_long)DIP(dp, di_size));
529 memmove(buf, (caddr_t)dp->dp2.di_db,
530 (u_long)DIP(dp, di_size));
531 buf[DIP(dp, di_size)] = '\0';
533 writeextdata(dp, ino, added);
540 if (DIP(dp, di_size) > 0)
548 added = appendextdata(dp);
550 writeextdata(dp, ino, added);
554 msg("Warning: undefined file type 0%o\n",
555 DIP(dp, di_mode) & IFMT);
558 if (DIP(dp, di_size) > NDADDR * sblock->fs_bsize) {
559 cnt = NDADDR * sblock->fs_frag;
562 cnt = howmany(DIP(dp, di_size), sblock->fs_fsize);
565 if (sblock->fs_magic == FS_UFS1_MAGIC)
566 ufs1_blksout(&dp->dp1.di_db[0], cnt, ino);
568 ufs2_blksout(dp, &dp->dp2.di_db[0], cnt, ino, last);
569 if ((size = DIP(dp, di_size) - NDADDR * sblock->fs_bsize) <= 0)
571 for (ind_level = 0; ind_level < NIADDR; ind_level++) {
572 dmpindir(dp, ino, DIP(dp, di_ib[ind_level]), ind_level, &size);
579 * Read indirect blocks, and pass the data blocks to be dumped.
582 dmpindir(union dinode *dp, ino_t ino, ufs2_daddr_t blk, int ind_level,
586 ufs1_daddr_t ufs1[MAXBSIZE / sizeof(ufs1_daddr_t)];
587 ufs2_daddr_t ufs2[MAXBSIZE / sizeof(ufs2_daddr_t)];
592 bread(fsbtodb(sblock, blk), (char *)&idblk,
593 (int)sblock->fs_bsize);
595 memset(&idblk, 0, sblock->fs_bsize);
596 if (ind_level <= 0) {
597 if (*size > NINDIR(sblock) * sblock->fs_bsize) {
598 cnt = NINDIR(sblock) * sblock->fs_frag;
601 cnt = howmany(*size, sblock->fs_fsize);
604 *size -= NINDIR(sblock) * sblock->fs_bsize;
605 if (sblock->fs_magic == FS_UFS1_MAGIC)
606 ufs1_blksout(idblk.ufs1, cnt, ino);
608 ufs2_blksout(dp, idblk.ufs2, cnt, ino, last);
612 for (i = 0; i < NINDIR(sblock); i++) {
613 if (sblock->fs_magic == FS_UFS1_MAGIC)
614 dmpindir(dp, ino, idblk.ufs1[i], ind_level, size);
616 dmpindir(dp, ino, idblk.ufs2[i], ind_level, size);
623 * Collect up the data into tape record sized buffers and output them.
626 ufs1_blksout(ufs1_daddr_t *blkp, int frags, ino_t ino)
629 int i, j, count, blks, tbperdb;
631 blks = howmany(frags * sblock->fs_fsize, TP_BSIZE);
632 tbperdb = sblock->fs_bsize >> tp_bshift;
633 for (i = 0; i < blks; i += TP_NINDIR) {
634 if (i + TP_NINDIR > blks)
637 count = i + TP_NINDIR;
638 for (j = i; j < count; j++)
639 if (blkp[j / tbperdb] != 0)
640 spcl.c_addr[j - i] = 1;
642 spcl.c_addr[j - i] = 0;
643 spcl.c_count = count - i;
645 bp = &blkp[i / tbperdb];
646 for (j = i; j < count; j += tbperdb, bp++)
648 if (j + tbperdb <= count)
649 dumpblock(*bp, (int)sblock->fs_bsize);
651 dumpblock(*bp, (count - j) * TP_BSIZE);
653 spcl.c_type = TS_ADDR;
658 * Collect up the data into tape record sized buffers and output them.
661 ufs2_blksout(union dinode *dp, ufs2_daddr_t *blkp, int frags, ino_t ino,
665 int i, j, count, resid, blks, tbperdb, added;
666 static int writingextdata = 0;
669 * Calculate the number of TP_BSIZE blocks to be dumped.
670 * For filesystems with a fragment size bigger than TP_BSIZE,
671 * only part of the final fragment may need to be dumped.
673 blks = howmany(frags * sblock->fs_fsize, TP_BSIZE);
675 resid = howmany(fragoff(sblock, dp->dp2.di_size), TP_BSIZE);
677 blks -= howmany(sblock->fs_fsize, TP_BSIZE) - resid;
679 tbperdb = sblock->fs_bsize >> tp_bshift;
680 for (i = 0; i < blks; i += TP_NINDIR) {
681 if (i + TP_NINDIR > blks)
684 count = i + TP_NINDIR;
685 for (j = i; j < count; j++)
686 if (blkp[j / tbperdb] != 0)
687 spcl.c_addr[j - i] = 1;
689 spcl.c_addr[j - i] = 0;
690 spcl.c_count = count - i;
691 if (last && count == blks && !writingextdata)
692 added = appendextdata(dp);
694 bp = &blkp[i / tbperdb];
695 for (j = i; j < count; j += tbperdb, bp++)
697 if (j + tbperdb <= count)
698 dumpblock(*bp, (int)sblock->fs_bsize);
700 dumpblock(*bp, (count - j) * TP_BSIZE);
702 spcl.c_type = TS_ADDR;
704 if (last && count == blks && !writingextdata) {
706 writeextdata(dp, ino, added);
713 * If there is room in the current block for the extended attributes
714 * as well as the file data, update the header to reflect the added
715 * attribute data at the end. Attributes are placed at the end so that
716 * old versions of restore will correctly restore the file and simply
717 * discard the extra data at the end that it does not understand.
718 * The attribute data is dumped following the file data by the
719 * writeextdata() function (below).
722 appendextdata(union dinode *dp)
724 int i, blks, tbperdb;
727 * If no extended attributes, there is nothing to do.
729 if (spcl.c_extsize == 0)
732 * If there is not enough room at the end of this block
733 * to add the extended attributes, then rather than putting
734 * part of them here, we simply push them entirely into a
735 * new block rather than putting some here and some later.
737 if (spcl.c_extsize > NXADDR * sblock->fs_bsize)
738 blks = howmany(NXADDR * sblock->fs_bsize, TP_BSIZE);
740 blks = howmany(spcl.c_extsize, TP_BSIZE);
741 if (spcl.c_count + blks > TP_NINDIR)
744 * Update the block map in the header to indicate the added
745 * extended attribute. They will be appended after the file
746 * data by the writeextdata() routine.
748 tbperdb = sblock->fs_bsize >> tp_bshift;
749 for (i = 0; i < blks; i++)
750 if (&dp->dp2.di_extb[i / tbperdb] != 0)
751 spcl.c_addr[spcl.c_count + i] = 1;
753 spcl.c_addr[spcl.c_count + i] = 0;
754 spcl.c_count += blks;
759 * Dump the extended attribute data. If there was room in the file
760 * header, then all we need to do is output the data blocks. If there
761 * was not room in the file header, then an additional TS_ADDR header
762 * is created to hold the attribute data.
765 writeextdata(union dinode *dp, ino_t ino, int added)
767 int i, frags, blks, tbperdb, last;
772 * If no extended attributes, there is nothing to do.
774 if (spcl.c_extsize == 0)
777 * If there was no room in the file block for the attributes,
778 * dump them out in a new block, otherwise just dump the data.
781 if (spcl.c_extsize > NXADDR * sblock->fs_bsize) {
782 frags = NXADDR * sblock->fs_frag;
785 frags = howmany(spcl.c_extsize, sblock->fs_fsize);
788 ufs2_blksout(dp, &dp->dp2.di_extb[0], frags, ino, last);
790 if (spcl.c_extsize > NXADDR * sblock->fs_bsize)
791 blks = howmany(NXADDR * sblock->fs_bsize, TP_BSIZE);
793 blks = howmany(spcl.c_extsize, TP_BSIZE);
794 tbperdb = sblock->fs_bsize >> tp_bshift;
795 for (i = 0; i < blks; i += tbperdb) {
796 bp = &dp->dp2.di_extb[i / tbperdb];
798 if (i + tbperdb <= blks)
799 dumpblock(*bp, (int)sblock->fs_bsize);
801 dumpblock(*bp, (blks - i) * TP_BSIZE);
807 * If an indirect block is added for extended attributes, then
808 * di_exti below should be changed to the structure element
809 * that references the extended attribute indirect block. This
810 * definition is here only to make it compile without complaint.
812 #define di_exti di_spare[0]
814 * If the extended attributes fall into an indirect block,
817 if ((size = spcl.c_extsize - NXADDR * sblock->fs_bsize) > 0)
818 dmpindir(dp, ino, dp->dp2.di_exti, 0, &size);
822 * Dump a map to the tape.
825 dumpmap(char *map, int type, ino_t ino)
831 spcl.c_count = howmany(mapsize * sizeof(char), TP_BSIZE);
833 for (i = 0, cp = map; i < spcl.c_count; i++, cp += TP_BSIZE)
838 * Write a header record to the dump tape.
841 writeheader(ino_t ino)
843 int32_t sum, cnt, *lp;
845 if (rsync_friendly >= 2) {
846 /* don't track changes to access time */
847 spcl.c_atime = spcl.c_mtime;
848 spcl.c_atimensec = spcl.c_mtimensec;
850 spcl.c_inumber = ino;
851 spcl.c_magic = FS_UFS2_MAGIC;
853 lp = (int32_t *)&spcl;
855 cnt = sizeof(union u_spcl) / (4 * sizeof(int32_t));
862 spcl.c_checksum = CHECKSUM - sum;
863 writerec((char *)&spcl, 1);
867 getino(ino_t inum, int *modep)
869 static ino_t minino, maxino;
870 static caddr_t inoblock;
871 struct ufs1_dinode *dp1;
872 struct ufs2_dinode *dp2;
874 if (inoblock == NULL && (inoblock = malloc(sblock->fs_bsize)) == NULL)
875 quit("cannot allocate inode memory.\n");
877 if (inum >= minino && inum < maxino)
879 bread(fsbtodb(sblock, ino_to_fsba(sblock, inum)), inoblock,
880 (int)sblock->fs_bsize);
881 minino = inum - (inum % INOPB(sblock));
882 maxino = minino + INOPB(sblock);
884 if (sblock->fs_magic == FS_UFS1_MAGIC) {
885 dp1 = &((struct ufs1_dinode *)inoblock)[inum - minino];
886 *modep = (dp1->di_mode & IFMT);
887 return ((union dinode *)dp1);
889 dp2 = &((struct ufs2_dinode *)inoblock)[inum - minino];
890 *modep = (dp2->di_mode & IFMT);
891 return ((union dinode *)dp2);
895 * Read a chunk of data from the disk.
896 * Try to recover from hard errors by reading in sector sized pieces.
897 * Error recovery is attempted at most BREADEMAX times before seeking
898 * consent from the operator to continue.
904 bread(ufs2_daddr_t blkno, char *buf, int size)
906 int secsize, bytes, resid, xfer, base, cnt, i;
911 offset = blkno << dev_bshift;
912 secsize = sblock->fs_fsize;
913 base = offset % secsize;
914 resid = size % secsize;
916 * If the transfer request starts or ends on a non-sector
917 * boundary, we must read the entire sector and copy out
918 * just the part that we need.
920 if (base == 0 && resid == 0) {
921 cnt = cread(diskfd, buf, size, offset);
925 if (tmpbuf == NULL && (tmpbuf = malloc(secsize)) == 0)
926 quit("buffer malloc failed\n");
930 cnt = cread(diskfd, tmpbuf, secsize, offset - base);
933 xfer = MIN(secsize - base, size);
936 resid = bytes % secsize;
937 memcpy(buf, &tmpbuf[base], xfer);
939 if (bytes >= secsize) {
940 cnt = cread(diskfd, &buf[xfer], bytes - resid, offset);
941 if (cnt != bytes - resid)
948 cnt = cread(diskfd, tmpbuf, secsize, offset);
949 if (cnt == secsize) {
950 memcpy(&buf[xfer], tmpbuf, resid);
955 if (blkno + (size / dev_bsize) > fsbtodb(sblock, sblock->fs_size)) {
957 * Trying to read the final fragment.
959 * NB - dump only works in TP_BSIZE blocks, hence
960 * rounds `dev_bsize' fragments up to TP_BSIZE pieces.
961 * It should be smarter about not actually trying to
962 * read more than it can get, but for the time being
963 * we punt and scale back the read only when it gets
964 * us into trouble. (mkm 9/25/83)
970 msg("read error from %s: %s: [block %jd]: count=%d\n",
971 disk, strerror(errno), (intmax_t)blkno, size);
973 msg("short read error from %s: [block %jd]: count=%d, got=%d\n",
974 disk, (intmax_t)blkno, size, cnt);
975 if (++breaderrors > BREADEMAX) {
976 msg("More than %d block read errors from %s\n",
978 broadcast("DUMP IS AILING!\n");
979 msg("This is an unrecoverable error.\n");
980 if (!query("Do you want to attempt to continue?")){
987 * Zero buffer, then try to read each sector of buffer separately,
988 * and bypass the cache.
990 memset(buf, 0, size);
991 for (i = 0; i < size; i += dev_bsize, buf += dev_bsize, blkno++) {
992 if ((cnt = pread(diskfd, buf, (int)dev_bsize,
993 ((off_t)blkno << dev_bshift))) == dev_bsize)
996 msg("read error from %s: %s: [sector %jd]: count=%ld\n",
997 disk, strerror(errno), (intmax_t)blkno, dev_bsize);
1000 msg("short read from %s: [sector %jd]: count=%ld, got=%d\n",
1001 disk, (intmax_t)blkno, dev_bsize, cnt);