2 * modified for Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
8 * Copyright (c) 1982, 1986, 1989, 1993
9 * The Regents of the University of California. All rights reserved.
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12 * modification, are permitted provided that the following conditions
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20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
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24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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35 * @(#)ffs_alloc.c 8.8 (Berkeley) 2/21/94
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/vnode.h>
44 #include <sys/mount.h>
45 #include <sys/sysctl.h>
46 #include <sys/syslog.h>
49 #include <fs/ext2fs/fs.h>
50 #include <fs/ext2fs/inode.h>
51 #include <fs/ext2fs/ext2_mount.h>
52 #include <fs/ext2fs/ext2fs.h>
53 #include <fs/ext2fs/ext2_extern.h>
55 static daddr_t ext2_alloccg(struct inode *, int, daddr_t, int);
56 static daddr_t ext2_clusteralloc(struct inode *, int, daddr_t, int);
57 static u_long ext2_dirpref(struct inode *);
58 static void ext2_fserr(struct m_ext2fs *, uid_t, char *);
59 static u_long ext2_hashalloc(struct inode *, int, long, int,
60 daddr_t (*)(struct inode *, int, daddr_t,
62 static daddr_t ext2_nodealloccg(struct inode *, int, daddr_t, int);
63 static daddr_t ext2_mapsearch(struct m_ext2fs *, char *, daddr_t);
66 * Allocate a block in the filesystem.
68 * A preference may be optionally specified. If a preference is given
69 * the following hierarchy is used to allocate a block:
70 * 1) allocate the requested block.
71 * 2) allocate a rotationally optimal block in the same cylinder.
72 * 3) allocate a block in the same cylinder group.
73 * 4) quadradically rehash into other cylinder groups, until an
74 * available block is located.
75 * If no block preference is given the following hierarchy is used
76 * to allocate a block:
77 * 1) allocate a block in the cylinder group that contains the
79 * 2) quadradically rehash into other cylinder groups, until an
80 * available block is located.
83 ext2_alloc(struct inode *ip, daddr_t lbn, e4fs_daddr_t bpref, int size,
84 struct ucred *cred, e4fs_daddr_t *bnp)
87 struct ext2mount *ump;
94 mtx_assert(EXT2_MTX(ump), MA_OWNED);
96 if ((u_int)size > fs->e2fs_bsize || blkoff(fs, size) != 0) {
97 vn_printf(ip->i_devvp, "bsize = %lu, size = %d, fs = %s\n",
98 (long unsigned int)fs->e2fs_bsize, size, fs->e2fs_fsmnt);
99 panic("ext2_alloc: bad size");
102 panic("ext2_alloc: missing credential");
103 #endif /* INVARIANTS */
104 if (size == fs->e2fs_bsize && fs->e2fs->e2fs_fbcount == 0)
106 if (cred->cr_uid != 0 &&
107 fs->e2fs->e2fs_fbcount < fs->e2fs->e2fs_rbcount)
109 if (bpref >= fs->e2fs->e2fs_bcount)
112 cg = ino_to_cg(fs, ip->i_number);
114 cg = dtog(fs, bpref);
115 bno = (daddr_t)ext2_hashalloc(ip, cg, bpref, fs->e2fs_bsize,
118 /* set next_alloc fields as done in block_getblk */
119 ip->i_next_alloc_block = lbn;
120 ip->i_next_alloc_goal = bno;
122 ip->i_blocks += btodb(fs->e2fs_bsize);
123 ip->i_flag |= IN_CHANGE | IN_UPDATE;
129 ext2_fserr(fs, cred->cr_uid, "filesystem full");
130 uprintf("\n%s: write failed, filesystem is full\n", fs->e2fs_fsmnt);
135 * Reallocate a sequence of blocks into a contiguous sequence of blocks.
137 * The vnode and an array of buffer pointers for a range of sequential
138 * logical blocks to be made contiguous is given. The allocator attempts
139 * to find a range of sequential blocks starting as close as possible to
140 * an fs_rotdelay offset from the end of the allocation for the logical
141 * block immediately preceding the current range. If successful, the
142 * physical block numbers in the buffer pointers and in the inode are
143 * changed to reflect the new allocation. If unsuccessful, the allocation
144 * is left unchanged. The success in doing the reallocation is returned.
145 * Note that the error return is not reflected back to the user. Rather
146 * the previous block allocation will be used.
149 static SYSCTL_NODE(_vfs, OID_AUTO, ext2fs, CTLFLAG_RW, 0, "EXT2FS filesystem");
151 static int doasyncfree = 1;
153 SYSCTL_INT(_vfs_ext2fs, OID_AUTO, doasyncfree, CTLFLAG_RW, &doasyncfree, 0,
154 "Use asychronous writes to update block pointers when freeing blocks");
156 static int doreallocblks = 1;
158 SYSCTL_INT(_vfs_ext2fs, OID_AUTO, doreallocblks, CTLFLAG_RW, &doreallocblks, 0, "");
161 ext2_reallocblks(struct vop_reallocblks_args *ap)
166 struct buf *sbp, *ebp;
167 uint32_t *bap, *sbap, *ebap;
168 struct ext2mount *ump;
169 struct cluster_save *buflist;
170 struct indir start_ap[NIADDR + 1], end_ap[NIADDR + 1], *idp;
171 e2fs_lbn_t start_lbn, end_lbn;
173 e2fs_daddr_t newblk, blkno;
174 int i, len, start_lvl, end_lvl, pref, ssize;
176 if (doreallocblks == 0)
184 if (fs->e2fs_contigsumsize <= 0)
187 buflist = ap->a_buflist;
188 len = buflist->bs_nchildren;
189 start_lbn = buflist->bs_children[0]->b_lblkno;
190 end_lbn = start_lbn + len - 1;
192 for (i = 1; i < len; i++)
193 if (buflist->bs_children[i]->b_lblkno != start_lbn + i)
194 panic("ext2_reallocblks: non-cluster");
197 * If the cluster crosses the boundary for the first indirect
198 * block, leave space for the indirect block. Indirect blocks
199 * are initially laid out in a position after the last direct
200 * block. Block reallocation would usually destroy locality by
201 * moving the indirect block out of the way to make room for
202 * data blocks if we didn't compensate here. We should also do
203 * this for other indirect block boundaries, but it is only
204 * important for the first one.
206 if (start_lbn < NDADDR && end_lbn >= NDADDR)
209 * If the latest allocation is in a new cylinder group, assume that
210 * the filesystem has decided to move and do not force it back to
211 * the previous cylinder group.
213 if (dtog(fs, dbtofsb(fs, buflist->bs_children[0]->b_blkno)) !=
214 dtog(fs, dbtofsb(fs, buflist->bs_children[len - 1]->b_blkno)))
216 if (ext2_getlbns(vp, start_lbn, start_ap, &start_lvl) ||
217 ext2_getlbns(vp, end_lbn, end_ap, &end_lvl))
220 * Get the starting offset and block map for the first block.
222 if (start_lvl == 0) {
226 idp = &start_ap[start_lvl - 1];
227 if (bread(vp, idp->in_lbn, (int)fs->e2fs_bsize, NOCRED, &sbp)) {
231 sbap = (u_int *)sbp->b_data;
235 * If the block range spans two block maps, get the second map.
238 if (end_lvl == 0 || (idp = &end_ap[end_lvl - 1])->in_off + 1 >= len) {
242 if (start_ap[start_lvl - 1].in_lbn == idp->in_lbn)
243 panic("ext2_reallocblks: start == end");
245 ssize = len - (idp->in_off + 1);
246 if (bread(vp, idp->in_lbn, (int)fs->e2fs_bsize, NOCRED, &ebp))
248 ebap = (u_int *)ebp->b_data;
251 * Find the preferred location for the cluster.
254 pref = ext2_blkpref(ip, start_lbn, soff, sbap, 0);
256 * Search the block map looking for an allocation of the desired size.
258 if ((newblk = (e2fs_daddr_t)ext2_hashalloc(ip, dtog(fs, pref), pref,
259 len, ext2_clusteralloc)) == 0) {
264 * We have found a new contiguous block.
266 * First we have to replace the old block pointers with the new
267 * block pointers in the inode and indirect blocks associated
271 printf("realloc: ino %d, lbns %jd-%jd\n\told:", ip->i_number,
272 (intmax_t)start_lbn, (intmax_t)end_lbn);
275 for (bap = &sbap[soff], i = 0; i < len; i++, blkno += fs->e2fs_fpb) {
281 if (buflist->bs_children[i]->b_blkno != fsbtodb(fs, *bap))
282 panic("ext2_reallocblks: alloc mismatch");
285 printf(" %d,", *bap);
290 * Next we must write out the modified inode and indirect blocks.
291 * For strict correctness, the writes should be synchronous since
292 * the old block values may have been written to disk. In practise
293 * they are almost never written, but if we are concerned about
294 * strict correctness, the `doasyncfree' flag should be set to zero.
296 * The test on `doasyncfree' should be changed to test a flag
297 * that shows whether the associated buffers and inodes have
298 * been written. The flag should be set when the cluster is
299 * started and cleared whenever the buffer or inode is flushed.
300 * We can then check below to see if it is set, and do the
301 * synchronous write only when it has been cleared.
303 if (sbap != &ip->i_db[0]) {
309 ip->i_flag |= IN_CHANGE | IN_UPDATE;
320 * Last, free the old blocks and assign the new blocks to the buffers.
325 for (blkno = newblk, i = 0; i < len; i++, blkno += fs->e2fs_fpb) {
326 ext2_blkfree(ip, dbtofsb(fs, buflist->bs_children[i]->b_blkno),
328 buflist->bs_children[i]->b_blkno = fsbtodb(fs, blkno);
330 printf(" %d,", blkno);
341 if (sbap != &ip->i_db[0])
347 * Allocate an inode in the filesystem.
351 ext2_valloc(struct vnode *pvp, int mode, struct ucred *cred, struct vnode **vpp)
357 struct ext2mount *ump;
367 if (fs->e2fs->e2fs_ficount == 0)
370 * If it is a directory then obtain a cylinder group based on
371 * ext2_dirpref else obtain it using ino_to_cg. The preferred inode is
372 * always the next inode.
374 if ((mode & IFMT) == IFDIR) {
375 cg = ext2_dirpref(pip);
376 if (fs->e2fs_contigdirs[cg] < 255)
377 fs->e2fs_contigdirs[cg]++;
379 cg = ino_to_cg(fs, pip->i_number);
380 if (fs->e2fs_contigdirs[cg] > 0)
381 fs->e2fs_contigdirs[cg]--;
383 ipref = cg * fs->e2fs->e2fs_ipg + 1;
384 ino = (ino_t)ext2_hashalloc(pip, cg, (long)ipref, mode, ext2_nodealloccg);
388 error = VFS_VGET(pvp->v_mount, ino, LK_EXCLUSIVE, vpp);
390 ext2_vfree(pvp, ino, mode);
396 * The question is whether using VGET was such good idea at all:
397 * Linux doesn't read the old inode in when it is allocating a
398 * new one. I will set at least i_size and i_blocks to zero.
405 /* now we want to make sure that the block pointers are zeroed out */
406 for (i = 0; i < NDADDR; i++)
408 for (i = 0; i < NIADDR; i++)
412 * Set up a new generation number for this inode.
414 ip->i_gen = arc4random();
417 ip->i_birthtime = ts.tv_sec;
418 ip->i_birthnsec = ts.tv_nsec;
421 printf("ext2_valloc: allocated inode %d\n", ino);
426 ext2_fserr(fs, cred->cr_uid, "out of inodes");
427 uprintf("\n%s: create/symlink failed, no inodes free\n", fs->e2fs_fsmnt);
432 * Find a cylinder to place a directory.
434 * The policy implemented by this algorithm is to allocate a
435 * directory inode in the same cylinder group as its parent
436 * directory, but also to reserve space for its files inodes
437 * and data. Restrict the number of directories which may be
438 * allocated one after another in the same cylinder group
439 * without intervening allocation of files.
441 * If we allocate a first level directory then force allocation
442 * in another cylinder group.
446 ext2_dirpref(struct inode *pip)
449 int cg, prefcg, cgsize;
450 u_int avgifree, avgbfree, avgndir, curdirsize;
451 u_int minifree, minbfree, maxndir;
452 u_int mincg, minndir;
453 u_int dirsize, maxcontigdirs;
455 mtx_assert(EXT2_MTX(pip->i_ump), MA_OWNED);
458 avgifree = fs->e2fs->e2fs_ficount / fs->e2fs_gcount;
459 avgbfree = fs->e2fs->e2fs_fbcount / fs->e2fs_gcount;
460 avgndir = fs->e2fs_total_dir / fs->e2fs_gcount;
463 * Force allocation in another cg if creating a first level dir.
465 ASSERT_VOP_LOCKED(ITOV(pip), "ext2fs_dirpref");
466 if (ITOV(pip)->v_vflag & VV_ROOT) {
467 prefcg = arc4random() % fs->e2fs_gcount;
469 minndir = fs->e2fs_ipg;
470 for (cg = prefcg; cg < fs->e2fs_gcount; cg++)
471 if (fs->e2fs_gd[cg].ext2bgd_ndirs < minndir &&
472 fs->e2fs_gd[cg].ext2bgd_nifree >= avgifree &&
473 fs->e2fs_gd[cg].ext2bgd_nbfree >= avgbfree) {
475 minndir = fs->e2fs_gd[cg].ext2bgd_ndirs;
477 for (cg = 0; cg < prefcg; cg++)
478 if (fs->e2fs_gd[cg].ext2bgd_ndirs < minndir &&
479 fs->e2fs_gd[cg].ext2bgd_nifree >= avgifree &&
480 fs->e2fs_gd[cg].ext2bgd_nbfree >= avgbfree) {
482 minndir = fs->e2fs_gd[cg].ext2bgd_ndirs;
487 * Count various limits which used for
488 * optimal allocation of a directory inode.
490 maxndir = min(avgndir + fs->e2fs_ipg / 16, fs->e2fs_ipg);
491 minifree = avgifree - avgifree / 4;
494 minbfree = avgbfree - avgbfree / 4;
497 cgsize = fs->e2fs_fsize * fs->e2fs_fpg;
498 dirsize = AVGDIRSIZE;
499 curdirsize = avgndir ? (cgsize - avgbfree * fs->e2fs_bsize) / avgndir : 0;
500 if (dirsize < curdirsize)
501 dirsize = curdirsize;
502 maxcontigdirs = min((avgbfree * fs->e2fs_bsize) / dirsize, 255);
503 maxcontigdirs = min(maxcontigdirs, fs->e2fs_ipg / AFPDIR);
504 if (maxcontigdirs == 0)
508 * Limit number of dirs in one cg and reserve space for
509 * regular files, but only if we have no deficit in
512 prefcg = ino_to_cg(fs, pip->i_number);
513 for (cg = prefcg; cg < fs->e2fs_gcount; cg++)
514 if (fs->e2fs_gd[cg].ext2bgd_ndirs < maxndir &&
515 fs->e2fs_gd[cg].ext2bgd_nifree >= minifree &&
516 fs->e2fs_gd[cg].ext2bgd_nbfree >= minbfree) {
517 if (fs->e2fs_contigdirs[cg] < maxcontigdirs)
520 for (cg = 0; cg < prefcg; cg++)
521 if (fs->e2fs_gd[cg].ext2bgd_ndirs < maxndir &&
522 fs->e2fs_gd[cg].ext2bgd_nifree >= minifree &&
523 fs->e2fs_gd[cg].ext2bgd_nbfree >= minbfree) {
524 if (fs->e2fs_contigdirs[cg] < maxcontigdirs)
528 * This is a backstop when we have deficit in space.
530 for (cg = prefcg; cg < fs->e2fs_gcount; cg++)
531 if (fs->e2fs_gd[cg].ext2bgd_nifree >= avgifree)
533 for (cg = 0; cg < prefcg; cg++)
534 if (fs->e2fs_gd[cg].ext2bgd_nifree >= avgifree)
540 * Select the desired position for the next block in a file.
542 * we try to mimic what Remy does in inode_getblk/block_getblk
544 * we note: blocknr == 0 means that we're about to allocate either
545 * a direct block or a pointer block at the first level of indirection
546 * (In other words, stuff that will go in i_db[] or i_ib[])
548 * blocknr != 0 means that we're allocating a block that is none
549 * of the above. Then, blocknr tells us the number of the block
550 * that will hold the pointer
553 ext2_blkpref(struct inode *ip, e2fs_lbn_t lbn, int indx, e2fs_daddr_t *bap,
554 e2fs_daddr_t blocknr)
558 mtx_assert(EXT2_MTX(ip->i_ump), MA_OWNED);
561 * If the next block is actually what we thought it is, then set the
562 * goal to what we thought it should be.
564 if (ip->i_next_alloc_block == lbn && ip->i_next_alloc_goal != 0)
565 return ip->i_next_alloc_goal;
568 * Now check whether we were provided with an array that basically
569 * tells us previous blocks to which we want to stay close.
572 for (tmp = indx - 1; tmp >= 0; tmp--)
577 * Else lets fall back to the blocknr or, if there is none, follow
578 * the rule that a block should be allocated near its inode.
580 return blocknr ? blocknr :
581 (e2fs_daddr_t)(ip->i_block_group *
582 EXT2_BLOCKS_PER_GROUP(ip->i_e2fs)) +
583 ip->i_e2fs->e2fs->e2fs_first_dblock;
587 * Implement the cylinder overflow algorithm.
589 * The policy implemented by this algorithm is:
590 * 1) allocate the block in its requested cylinder group.
591 * 2) quadradically rehash on the cylinder group number.
592 * 3) brute force search for a free block.
595 ext2_hashalloc(struct inode *ip, int cg, long pref, int size,
596 daddr_t (*allocator) (struct inode *, int, daddr_t, int))
602 mtx_assert(EXT2_MTX(ip->i_ump), MA_OWNED);
605 * 1: preferred cylinder group
607 result = (*allocator)(ip, cg, pref, size);
611 * 2: quadratic rehash
613 for (i = 1; i < fs->e2fs_gcount; i *= 2) {
615 if (cg >= fs->e2fs_gcount)
616 cg -= fs->e2fs_gcount;
617 result = (*allocator)(ip, cg, 0, size);
622 * 3: brute force search
623 * Note that we start at i == 2, since 0 was checked initially,
624 * and 1 is always checked in the quadratic rehash.
626 cg = (icg + 2) % fs->e2fs_gcount;
627 for (i = 2; i < fs->e2fs_gcount; i++) {
628 result = (*allocator)(ip, cg, 0, size);
632 if (cg == fs->e2fs_gcount)
639 * Determine whether a block can be allocated.
641 * Check to see if a block of the appropriate size is available,
642 * and if it is, allocate it.
645 ext2_alloccg(struct inode *ip, int cg, daddr_t bpref, int size)
649 struct ext2mount *ump;
650 daddr_t bno, runstart, runlen;
651 int bit, loc, end, error, start;
656 if (fs->e2fs_gd[cg].ext2bgd_nbfree == 0)
659 error = bread(ip->i_devvp, fsbtodb(fs,
660 fs->e2fs_gd[cg].ext2bgd_b_bitmap),
661 (int)fs->e2fs_bsize, NOCRED, &bp);
667 if (fs->e2fs_gd[cg].ext2bgd_nbfree == 0) {
669 * Another thread allocated the last block in this
670 * group while we were waiting for the buffer.
676 bbp = (char *)bp->b_data;
678 if (dtog(fs, bpref) != cg)
681 bpref = dtogd(fs, bpref);
683 * if the requested block is available, use it
685 if (isclr(bbp, bpref)) {
691 * no blocks in the requested cylinder, so take next
692 * available one in this cylinder group.
693 * first try to get 8 contigous blocks, then fall back to a single
697 start = dtogd(fs, bpref) / NBBY;
700 end = howmany(fs->e2fs->e2fs_fpg, NBBY) - start;
704 for (loc = start; loc < end; loc++) {
705 if (bbp[loc] == (char)0xff) {
710 /* Start of a run, find the number of high clear bits. */
714 runstart = loc * NBBY + bit;
715 } else if (bbp[loc] == 0) {
716 /* Continue a run. */
720 * Finish the current run. If it isn't long
721 * enough, start a new one.
723 bit = ffs(bbp[loc]) - 1;
730 /* Run was too short, start a new one. */
733 runstart = loc * NBBY + bit;
736 /* If the current run is long enough, use it. */
747 bno = ext2_mapsearch(fs, bbp, bpref);
755 if (isset(bbp, bno)) {
756 printf("ext2fs_alloccgblk: cg=%d bno=%jd fs=%s\n",
757 cg, (intmax_t)bno, fs->e2fs_fsmnt);
758 panic("ext2fs_alloccg: dup alloc");
763 ext2_clusteracct(fs, bbp, cg, bno, -1);
764 fs->e2fs->e2fs_fbcount--;
765 fs->e2fs_gd[cg].ext2bgd_nbfree--;
769 return (cg * fs->e2fs->e2fs_fpg + fs->e2fs->e2fs_first_dblock + bno);
773 * Determine whether a cluster can be allocated.
776 ext2_clusteralloc(struct inode *ip, int cg, daddr_t bpref, int len)
779 struct ext2mount *ump;
782 int bit, error, got, i, loc, run;
789 if (fs->e2fs_maxcluster[cg] < len)
793 error = bread(ip->i_devvp,
794 fsbtodb(fs, fs->e2fs_gd[cg].ext2bgd_b_bitmap),
795 (int)fs->e2fs_bsize, NOCRED, &bp);
799 bbp = (char *)bp->b_data;
802 * Check to see if a cluster of the needed size (or bigger) is
803 * available in this cylinder group.
805 lp = &fs->e2fs_clustersum[cg].cs_sum[len];
806 for (i = len; i <= fs->e2fs_contigsumsize; i++)
809 if (i > fs->e2fs_contigsumsize) {
811 * Update the cluster summary information to reflect
812 * the true maximum-sized cluster so that future cluster
813 * allocation requests can avoid reading the bitmap only
814 * to find no cluster.
816 lp = &fs->e2fs_clustersum[cg].cs_sum[len - 1];
817 for (i = len - 1; i > 0; i--)
820 fs->e2fs_maxcluster[cg] = i;
825 /* Search the bitmap to find a big enough cluster like in FFS. */
826 if (dtog(fs, bpref) != cg)
829 bpref = dtogd(fs, bpref);
831 bit = 1 << (bpref % NBBY);
832 for (run = 0, got = bpref; got < fs->e2fs->e2fs_fpg; got++) {
833 if ((bbp[loc] & bit) != 0)
840 if ((got & (NBBY - 1)) != (NBBY - 1))
848 if (got >= fs->e2fs->e2fs_fpg)
851 /* Allocate the cluster that we found. */
852 for (i = 1; i < len; i++)
853 if (!isclr(bbp, got - run + i))
854 panic("ext2_clusteralloc: map mismatch");
857 if (bno >= fs->e2fs->e2fs_fpg)
858 panic("ext2_clusteralloc: allocated out of group");
861 for (i = 0; i < len; i += fs->e2fs_fpb) {
862 setbit(bbp, bno + i);
863 ext2_clusteracct(fs, bbp, cg, bno + i, -1);
864 fs->e2fs->e2fs_fbcount--;
865 fs->e2fs_gd[cg].ext2bgd_nbfree--;
871 return (cg * fs->e2fs->e2fs_fpg + fs->e2fs->e2fs_first_dblock + bno);
881 * Determine whether an inode can be allocated.
883 * Check to see if an inode is available, and if it is,
884 * allocate it using tode in the specified cylinder group.
887 ext2_nodealloccg(struct inode *ip, int cg, daddr_t ipref, int mode)
891 struct ext2mount *ump;
892 int error, start, len;
895 ipref--; /* to avoid a lot of (ipref -1) */
900 if (fs->e2fs_gd[cg].ext2bgd_nifree == 0)
903 error = bread(ip->i_devvp, fsbtodb(fs,
904 fs->e2fs_gd[cg].ext2bgd_i_bitmap),
905 (int)fs->e2fs_bsize, NOCRED, &bp);
911 if (fs->e2fs_gd[cg].ext2bgd_nifree == 0) {
913 * Another thread allocated the last i-node in this
914 * group while we were waiting for the buffer.
920 ibp = (char *)bp->b_data;
922 ipref %= fs->e2fs->e2fs_ipg;
923 if (isclr(ibp, ipref))
926 start = ipref / NBBY;
927 len = howmany(fs->e2fs->e2fs_ipg - ipref, NBBY);
928 loc = memcchr(&ibp[start], 0xff, len);
932 loc = memcchr(&ibp[start], 0xff, len);
934 printf("cg = %d, ipref = %lld, fs = %s\n",
935 cg, (long long)ipref, fs->e2fs_fsmnt);
936 panic("ext2fs_nodealloccg: map corrupted");
940 ipref = (loc - ibp) * NBBY + ffs(~*loc) - 1;
944 fs->e2fs_gd[cg].ext2bgd_nifree--;
945 fs->e2fs->e2fs_ficount--;
947 if ((mode & IFMT) == IFDIR) {
948 fs->e2fs_gd[cg].ext2bgd_ndirs++;
949 fs->e2fs_total_dir++;
953 return (cg * fs->e2fs->e2fs_ipg + ipref + 1);
957 * Free a block or fragment.
961 ext2_blkfree(struct inode *ip, e4fs_daddr_t bno, long size)
965 struct ext2mount *ump;
972 if ((u_int)bno >= fs->e2fs->e2fs_bcount) {
973 printf("bad block %lld, ino %llu\n", (long long)bno,
974 (unsigned long long)ip->i_number);
975 ext2_fserr(fs, ip->i_uid, "bad block");
978 error = bread(ip->i_devvp,
979 fsbtodb(fs, fs->e2fs_gd[cg].ext2bgd_b_bitmap),
980 (int)fs->e2fs_bsize, NOCRED, &bp);
985 bbp = (char *)bp->b_data;
986 bno = dtogd(fs, bno);
987 if (isclr(bbp, bno)) {
988 printf("block = %lld, fs = %s\n",
989 (long long)bno, fs->e2fs_fsmnt);
990 panic("ext2_blkfree: freeing free block");
994 ext2_clusteracct(fs, bbp, cg, bno, 1);
995 fs->e2fs->e2fs_fbcount++;
996 fs->e2fs_gd[cg].ext2bgd_nbfree++;
1007 ext2_vfree(struct vnode *pvp, ino_t ino, int mode)
1009 struct m_ext2fs *fs;
1012 struct ext2mount *ump;
1019 if ((u_int)ino > fs->e2fs_ipg * fs->e2fs_gcount)
1020 panic("ext2_vfree: range: devvp = %p, ino = %ju, fs = %s",
1021 pip->i_devvp, (uintmax_t)ino, fs->e2fs_fsmnt);
1023 cg = ino_to_cg(fs, ino);
1024 error = bread(pip->i_devvp,
1025 fsbtodb(fs, fs->e2fs_gd[cg].ext2bgd_i_bitmap),
1026 (int)fs->e2fs_bsize, NOCRED, &bp);
1031 ibp = (char *)bp->b_data;
1032 ino = (ino - 1) % fs->e2fs->e2fs_ipg;
1033 if (isclr(ibp, ino)) {
1034 printf("ino = %llu, fs = %s\n",
1035 (unsigned long long)ino, fs->e2fs_fsmnt);
1036 if (fs->e2fs_ronly == 0)
1037 panic("ext2_vfree: freeing free inode");
1041 fs->e2fs->e2fs_ficount++;
1042 fs->e2fs_gd[cg].ext2bgd_nifree++;
1043 if ((mode & IFMT) == IFDIR) {
1044 fs->e2fs_gd[cg].ext2bgd_ndirs--;
1045 fs->e2fs_total_dir--;
1054 * Find a block in the specified cylinder group.
1056 * It is a panic if a request is made to find a block if none are
1060 ext2_mapsearch(struct m_ext2fs *fs, char *bbp, daddr_t bpref)
1066 * find the fragment by searching through the free block
1067 * map for an appropriate bit pattern
1070 start = dtogd(fs, bpref) / NBBY;
1073 len = howmany(fs->e2fs->e2fs_fpg, NBBY) - start;
1074 loc = memcchr(&bbp[start], 0xff, len);
1078 loc = memcchr(&bbp[start], 0xff, len);
1080 printf("start = %d, len = %d, fs = %s\n",
1081 start, len, fs->e2fs_fsmnt);
1082 panic("ext2_mapsearch: map corrupted");
1086 return ((loc - bbp) * NBBY + ffs(~*loc) - 1);
1090 * Fserr prints the name of a filesystem with an error diagnostic.
1092 * The form of the error message is:
1096 ext2_fserr(struct m_ext2fs *fs, uid_t uid, char *cp)
1099 log(LOG_ERR, "uid %u on %s: %s\n", uid, fs->e2fs_fsmnt, cp);
1107 if (i == 0 || i == 1)
1109 for (a3 = 3, a5 = 5, a7 = 7;
1110 a3 <= i || a5 <= i || a7 <= i;
1111 a3 *= 3, a5 *= 5, a7 *= 7)
1112 if (i == a3 || i == a5 || i == a7)