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31 * @(#)ffs_inode.c 8.13 (Berkeley) 4/21/95
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_quota.h"
39 #include <sys/param.h>
40 #include <sys/systm.h>
43 #include <sys/malloc.h>
44 #include <sys/mount.h>
46 #include <sys/racct.h>
47 #include <sys/random.h>
48 #include <sys/resourcevar.h>
49 #include <sys/rwlock.h>
51 #include <sys/vmmeter.h>
52 #include <sys/vnode.h>
55 #include <vm/vm_extern.h>
56 #include <vm/vm_object.h>
58 #include <ufs/ufs/extattr.h>
59 #include <ufs/ufs/quota.h>
60 #include <ufs/ufs/ufsmount.h>
61 #include <ufs/ufs/inode.h>
62 #include <ufs/ufs/ufs_extern.h>
64 #include <ufs/ffs/fs.h>
65 #include <ufs/ffs/ffs_extern.h>
67 static int ffs_indirtrunc(struct inode *, ufs2_daddr_t, ufs2_daddr_t,
68 ufs2_daddr_t, int, ufs2_daddr_t *);
71 * Update the access, modified, and inode change times as specified by the
72 * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
73 * to disk if the IN_MODIFIED flag is set (it may be set initially, or by
74 * the timestamp update). The IN_LAZYMOD flag is set to force a write
75 * later if not now. The IN_LAZYACCESS is set instead of IN_MODIFIED if the fs
76 * is currently being suspended (or is suspended) and vnode has been accessed.
77 * If we write now, then clear IN_MODIFIED, IN_LAZYACCESS and IN_LAZYMOD to
78 * reflect the presumably successful write, and if waitfor is set, then wait
79 * for the write to complete.
82 ffs_update(vp, waitfor)
91 ASSERT_VOP_ELOCKED(vp, "ffs_update");
94 if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
96 ip->i_flag &= ~(IN_LAZYACCESS | IN_LAZYMOD | IN_MODIFIED);
98 if (fs->fs_ronly && ITOUMP(ip)->um_fsckpid == 0)
101 * If we are updating a snapshot and another process is currently
102 * writing the buffer containing the inode for this snapshot then
103 * a deadlock can occur when it tries to check the snapshot to see
104 * if that block needs to be copied. Thus when updating a snapshot
105 * we check to see if the buffer is already locked, and if it is
106 * we drop the snapshot lock until the buffer has been written
107 * and is available to us. We have to grab a reference to the
108 * snapshot vnode to prevent it from being removed while we are
109 * waiting for the buffer.
113 flags = GB_LOCK_NOWAIT;
115 error = bread_gb(ITODEVVP(ip),
116 fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
117 (int) fs->fs_bsize, NOCRED, flags, &bp);
121 KASSERT((IS_SNAPSHOT(ip)), ("EBUSY from non-snapshot"));
123 * Wait for our inode block to become available.
125 * Hold a reference to the vnode to protect against
126 * ffs_snapgone(). Since we hold a reference, it can only
127 * get reclaimed (VI_DOOMED flag) in a forcible downgrade
128 * or unmount. For an unmount, the entire filesystem will be
129 * gone, so we cannot attempt to touch anything associated
130 * with it while the vnode is unlocked; all we can do is
131 * pause briefly and try again. If when we relock the vnode
132 * we discover that it has been reclaimed, updating it is no
133 * longer necessary and we can just return an error.
138 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
140 if ((vp->v_iflag & VI_DOOMED) != 0)
144 if (DOINGSOFTDEP(vp))
145 softdep_update_inodeblock(ip, bp, waitfor);
146 else if (ip->i_effnlink != ip->i_nlink)
147 panic("ffs_update: bad link cnt");
149 *((struct ufs1_dinode *)bp->b_data +
150 ino_to_fsbo(fs, ip->i_number)) = *ip->i_din1;
151 /* XXX: FIX? The entropy here is desirable, but the harvesting may be expensive */
152 random_harvest_queue(&(ip->i_din1), sizeof(ip->i_din1), 1, RANDOM_FS_ATIME);
154 *((struct ufs2_dinode *)bp->b_data +
155 ino_to_fsbo(fs, ip->i_number)) = *ip->i_din2;
156 /* XXX: FIX? The entropy here is desirable, but the harvesting may be expensive */
157 random_harvest_queue(&(ip->i_din2), sizeof(ip->i_din2), 1, RANDOM_FS_ATIME);
161 else if (vm_page_count_severe() || buf_dirty_count_severe()) {
165 if (bp->b_bufsize == fs->fs_bsize)
166 bp->b_flags |= B_CLUSTEROK;
173 #define SINGLE 0 /* index of single indirect block */
174 #define DOUBLE 1 /* index of double indirect block */
175 #define TRIPLE 2 /* index of triple indirect block */
177 * Truncate the inode ip to at most length size, freeing the
181 ffs_truncate(vp, length, flags, cred)
188 ufs2_daddr_t bn, lbn, lastblock, lastiblock[UFS_NIADDR];
189 ufs2_daddr_t indir_lbn[UFS_NIADDR], oldblks[UFS_NDADDR + UFS_NIADDR];
190 ufs2_daddr_t newblks[UFS_NDADDR + UFS_NIADDR];
191 ufs2_daddr_t count, blocksreleased = 0, datablocks, blkno;
195 struct ufsmount *ump;
196 int softdeptrunc, journaltrunc;
197 int needextclean, extblocks;
198 int offset, size, level, nblocks;
199 int i, error, allerror, indiroff, waitforupdate;
203 ump = VFSTOUFS(vp->v_mount);
207 ASSERT_VOP_LOCKED(vp, "ffs_truncate");
211 if (length > fs->fs_maxfilesize)
214 error = getinoquota(ip);
219 * Historically clients did not have to specify which data
220 * they were truncating. So, if not specified, we assume
221 * traditional behavior, e.g., just the normal data.
223 if ((flags & (IO_EXT | IO_NORMAL)) == 0)
225 if (!DOINGSOFTDEP(vp) && !DOINGASYNC(vp))
227 waitforupdate = (flags & IO_SYNC) != 0 || !DOINGASYNC(vp);
229 * If we are truncating the extended-attributes, and cannot
230 * do it with soft updates, then do it slowly here. If we are
231 * truncating both the extended attributes and the file contents
232 * (e.g., the file is being unlinked), then pick it off with
233 * soft updates below.
238 journaltrunc = DOINGSUJ(vp);
239 if (journaltrunc == 0 && DOINGSOFTDEP(vp) && length == 0)
240 softdeptrunc = !softdep_slowdown(vp);
242 datablocks = DIP(ip, i_blocks);
243 if (fs->fs_magic == FS_UFS2_MAGIC && ip->i_din2->di_extsize > 0) {
244 extblocks = btodb(fragroundup(fs, ip->i_din2->di_extsize));
245 datablocks -= extblocks;
247 if ((flags & IO_EXT) && extblocks > 0) {
249 panic("ffs_truncate: partial trunc of extdata");
250 if (softdeptrunc || journaltrunc) {
251 if ((flags & IO_NORMAL) == 0)
255 if ((error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
258 (void) chkdq(ip, -extblocks, NOCRED, 0);
260 vinvalbuf(vp, V_ALT, 0, 0);
262 OFF_TO_IDX(lblktosize(fs, -extblocks)), 0);
263 osize = ip->i_din2->di_extsize;
264 ip->i_din2->di_blocks -= extblocks;
265 ip->i_din2->di_extsize = 0;
266 for (i = 0; i < UFS_NXADDR; i++) {
267 oldblks[i] = ip->i_din2->di_extb[i];
268 ip->i_din2->di_extb[i] = 0;
270 ip->i_flag |= IN_CHANGE;
271 if ((error = ffs_update(vp, waitforupdate)))
273 for (i = 0; i < UFS_NXADDR; i++) {
276 ffs_blkfree(ump, fs, ITODEVVP(ip), oldblks[i],
277 sblksize(fs, osize, i), ip->i_number,
282 if ((flags & IO_NORMAL) == 0)
284 if (vp->v_type == VLNK &&
285 (ip->i_size < vp->v_mount->mnt_maxsymlinklen ||
289 panic("ffs_truncate: partial truncate of symlink");
291 bzero(SHORTLINK(ip), (u_int)ip->i_size);
293 DIP_SET(ip, i_size, 0);
294 ip->i_flag |= IN_CHANGE | IN_UPDATE;
297 return (ffs_update(vp, waitforupdate));
299 if (ip->i_size == length) {
300 ip->i_flag |= IN_CHANGE | IN_UPDATE;
303 return (ffs_update(vp, 0));
306 panic("ffs_truncate: read-only filesystem");
309 vp->v_lasta = vp->v_clen = vp->v_cstart = vp->v_lastw = 0;
312 * Lengthen the size of the file. We must ensure that the
313 * last byte of the file is allocated. Since the smallest
314 * value of osize is 0, length will be at least 1.
316 if (osize < length) {
317 vnode_pager_setsize(vp, length);
319 error = UFS_BALLOC(vp, length - 1, 1, cred, flags, &bp);
321 vnode_pager_setsize(vp, osize);
325 DIP_SET(ip, i_size, length);
326 if (bp->b_bufsize == fs->fs_bsize)
327 bp->b_flags |= B_CLUSTEROK;
330 else if (DOINGASYNC(vp))
334 ip->i_flag |= IN_CHANGE | IN_UPDATE;
335 return (ffs_update(vp, waitforupdate));
338 * Lookup block number for a given offset. Zero length files
339 * have no blocks, so return a blkno of -1.
341 lbn = lblkno(fs, length - 1);
344 } else if (lbn < UFS_NDADDR) {
345 blkno = DIP(ip, i_db[lbn]);
347 error = UFS_BALLOC(vp, lblktosize(fs, (off_t)lbn), fs->fs_bsize,
348 cred, BA_METAONLY, &bp);
351 indiroff = (lbn - UFS_NDADDR) % NINDIR(fs);
353 blkno = ((ufs1_daddr_t *)(bp->b_data))[indiroff];
355 blkno = ((ufs2_daddr_t *)(bp->b_data))[indiroff];
357 * If the block number is non-zero, then the indirect block
358 * must have been previously allocated and need not be written.
359 * If the block number is zero, then we may have allocated
360 * the indirect block and hence need to write it out.
364 else if (flags & IO_SYNC)
370 * If the block number at the new end of the file is zero,
371 * then we must allocate it to ensure that the last block of
372 * the file is allocated. Soft updates does not handle this
373 * case, so here we have to clean up the soft updates data
374 * structures describing the allocation past the truncation
375 * point. Finding and deallocating those structures is a lot of
376 * work. Since partial truncation with a hole at the end occurs
377 * rarely, we solve the problem by syncing the file so that it
378 * will have no soft updates data structures left.
380 if (blkno == 0 && (error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
382 if (blkno != 0 && DOINGSOFTDEP(vp)) {
383 if (softdeptrunc == 0 && journaltrunc == 0) {
385 * If soft updates cannot handle this truncation,
386 * clean up soft dependency data structures and
387 * fall through to the synchronous truncation.
389 if ((error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
392 flags = IO_NORMAL | (needextclean ? IO_EXT: 0);
394 softdep_journal_freeblocks(ip, cred, length,
397 softdep_setup_freeblocks(ip, length, flags);
398 ASSERT_VOP_LOCKED(vp, "ffs_truncate1");
399 if (journaltrunc == 0) {
400 ip->i_flag |= IN_CHANGE | IN_UPDATE;
401 error = ffs_update(vp, 0);
407 * Shorten the size of the file. If the last block of the
408 * shortened file is unallocated, we must allocate it.
409 * Additionally, if the file is not being truncated to a
410 * block boundary, the contents of the partial block
411 * following the end of the file must be zero'ed in
412 * case it ever becomes accessible again because of
413 * subsequent file growth. Directories however are not
414 * zero'ed as they should grow back initialized to empty.
416 offset = blkoff(fs, length);
417 if (blkno != 0 && offset == 0) {
419 DIP_SET(ip, i_size, length);
421 lbn = lblkno(fs, length);
423 error = UFS_BALLOC(vp, length - 1, 1, cred, flags, &bp);
427 * When we are doing soft updates and the UFS_BALLOC
428 * above fills in a direct block hole with a full sized
429 * block that will be truncated down to a fragment below,
430 * we must flush out the block dependency with an FSYNC
431 * so that we do not get a soft updates inconsistency
432 * when we create the fragment below.
434 if (DOINGSOFTDEP(vp) && lbn < UFS_NDADDR &&
435 fragroundup(fs, blkoff(fs, length)) < fs->fs_bsize &&
436 (error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
439 DIP_SET(ip, i_size, length);
440 size = blksize(fs, ip, lbn);
441 if (vp->v_type != VDIR && offset != 0)
442 bzero((char *)bp->b_data + offset,
443 (u_int)(size - offset));
444 /* Kirk's code has reallocbuf(bp, size, 1) here */
446 if (bp->b_bufsize == fs->fs_bsize)
447 bp->b_flags |= B_CLUSTEROK;
450 else if (DOINGASYNC(vp))
456 * Calculate index into inode's block list of
457 * last direct and indirect blocks (if any)
458 * which we want to keep. Lastblock is -1 when
459 * the file is truncated to 0.
461 lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1;
462 lastiblock[SINGLE] = lastblock - UFS_NDADDR;
463 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
464 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
465 nblocks = btodb(fs->fs_bsize);
467 * Update file and block pointers on disk before we start freeing
468 * blocks. If we crash before free'ing blocks below, the blocks
469 * will be returned to the free list. lastiblock values are also
470 * normalized to -1 for calls to ffs_indirtrunc below.
472 for (level = TRIPLE; level >= SINGLE; level--) {
473 oldblks[UFS_NDADDR + level] = DIP(ip, i_ib[level]);
474 if (lastiblock[level] < 0) {
475 DIP_SET(ip, i_ib[level], 0);
476 lastiblock[level] = -1;
479 for (i = 0; i < UFS_NDADDR; i++) {
480 oldblks[i] = DIP(ip, i_db[i]);
482 DIP_SET(ip, i_db[i], 0);
484 ip->i_flag |= IN_CHANGE | IN_UPDATE;
485 allerror = ffs_update(vp, waitforupdate);
488 * Having written the new inode to disk, save its new configuration
489 * and put back the old block pointers long enough to process them.
490 * Note that we save the new block configuration so we can check it
493 for (i = 0; i < UFS_NDADDR; i++) {
494 newblks[i] = DIP(ip, i_db[i]);
495 DIP_SET(ip, i_db[i], oldblks[i]);
497 for (i = 0; i < UFS_NIADDR; i++) {
498 newblks[UFS_NDADDR + i] = DIP(ip, i_ib[i]);
499 DIP_SET(ip, i_ib[i], oldblks[UFS_NDADDR + i]);
502 DIP_SET(ip, i_size, osize);
504 error = vtruncbuf(vp, cred, length, fs->fs_bsize);
505 if (error && (allerror == 0))
509 * Indirect blocks first.
511 indir_lbn[SINGLE] = -UFS_NDADDR;
512 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
513 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
514 for (level = TRIPLE; level >= SINGLE; level--) {
515 bn = DIP(ip, i_ib[level]);
517 error = ffs_indirtrunc(ip, indir_lbn[level],
518 fsbtodb(fs, bn), lastiblock[level], level, &count);
521 blocksreleased += count;
522 if (lastiblock[level] < 0) {
523 DIP_SET(ip, i_ib[level], 0);
524 ffs_blkfree(ump, fs, ump->um_devvp, bn,
525 fs->fs_bsize, ip->i_number,
527 blocksreleased += nblocks;
530 if (lastiblock[level] >= 0)
535 * All whole direct blocks or frags.
537 for (i = UFS_NDADDR - 1; i > lastblock; i--) {
540 bn = DIP(ip, i_db[i]);
543 DIP_SET(ip, i_db[i], 0);
544 bsize = blksize(fs, ip, i);
545 ffs_blkfree(ump, fs, ump->um_devvp, bn, bsize, ip->i_number,
547 blocksreleased += btodb(bsize);
553 * Finally, look for a change in size of the
554 * last direct block; release any frags.
556 bn = DIP(ip, i_db[lastblock]);
558 long oldspace, newspace;
561 * Calculate amount of space we're giving
562 * back as old block size minus new block size.
564 oldspace = blksize(fs, ip, lastblock);
566 DIP_SET(ip, i_size, length);
567 newspace = blksize(fs, ip, lastblock);
569 panic("ffs_truncate: newspace");
570 if (oldspace - newspace > 0) {
572 * Block number of space to be free'd is
573 * the old block # plus the number of frags
574 * required for the storage we're keeping.
576 bn += numfrags(fs, newspace);
577 ffs_blkfree(ump, fs, ump->um_devvp, bn,
578 oldspace - newspace, ip->i_number, vp->v_type, NULL);
579 blocksreleased += btodb(oldspace - newspace);
584 for (level = SINGLE; level <= TRIPLE; level++)
585 if (newblks[UFS_NDADDR + level] != DIP(ip, i_ib[level]))
586 panic("ffs_truncate1");
587 for (i = 0; i < UFS_NDADDR; i++)
588 if (newblks[i] != DIP(ip, i_db[i]))
589 panic("ffs_truncate2");
592 (fs->fs_magic != FS_UFS2_MAGIC || ip->i_din2->di_extsize == 0) &&
593 (bo->bo_dirty.bv_cnt > 0 || bo->bo_clean.bv_cnt > 0))
594 panic("ffs_truncate3");
596 #endif /* INVARIANTS */
598 * Put back the real size.
601 DIP_SET(ip, i_size, length);
602 if (DIP(ip, i_blocks) >= blocksreleased)
603 DIP_SET(ip, i_blocks, DIP(ip, i_blocks) - blocksreleased);
605 DIP_SET(ip, i_blocks, 0);
606 ip->i_flag |= IN_CHANGE;
608 (void) chkdq(ip, -blocksreleased, NOCRED, 0);
614 softdep_journal_freeblocks(ip, cred, length, IO_EXT);
616 softdep_setup_freeblocks(ip, length, IO_EXT);
617 return (ffs_update(vp, waitforupdate));
621 * Release blocks associated with the inode ip and stored in the indirect
622 * block bn. Blocks are free'd in LIFO order up to (but not including)
623 * lastbn. If level is greater than SINGLE, the block is an indirect block
624 * and recursive calls to indirtrunc must be used to cleanse other indirect
628 ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
630 ufs2_daddr_t lbn, lastbn;
633 ufs2_daddr_t *countp;
639 int i, nblocks, error = 0, allerror = 0;
640 ufs2_daddr_t nb, nlbn, last;
641 ufs2_daddr_t blkcount, factor, blocksreleased = 0;
642 ufs1_daddr_t *bap1 = NULL;
643 ufs2_daddr_t *bap2 = NULL;
644 #define BAP(ip, i) (I_IS_UFS1(ip) ? bap1[i] : bap2[i])
649 * Calculate index in current block of last
650 * block to be kept. -1 indicates the entire
651 * block so we need not calculate the index.
653 factor = lbn_offset(fs, level);
657 nblocks = btodb(fs->fs_bsize);
659 * Get buffer of block pointers, zero those entries corresponding
660 * to blocks to be free'd, and update on disk copy first. Since
661 * double(triple) indirect before single(double) indirect, calls
662 * to bmap on these blocks will fail. However, we already have
663 * the on disk address, so we have to set the b_blkno field
664 * explicitly instead of letting bread do everything for us.
667 bp = getblk(vp, lbn, (int)fs->fs_bsize, 0, 0, 0);
668 if ((bp->b_flags & B_CACHE) == 0) {
672 racct_add_buf(curproc, bp, 0);
673 PROC_UNLOCK(curproc);
676 curthread->td_ru.ru_inblock++; /* pay for read */
677 bp->b_iocmd = BIO_READ;
678 bp->b_flags &= ~B_INVAL;
679 bp->b_ioflags &= ~BIO_ERROR;
680 if (bp->b_bcount > bp->b_bufsize)
681 panic("ffs_indirtrunc: bad buffer size");
683 vfs_busy_pages(bp, 0);
684 bp->b_iooffset = dbtob(bp->b_blkno);
695 bap1 = (ufs1_daddr_t *)bp->b_data;
697 bap2 = (ufs2_daddr_t *)bp->b_data;
699 copy = malloc(fs->fs_bsize, M_TEMP, M_WAITOK);
700 bcopy((caddr_t)bp->b_data, copy, (u_int)fs->fs_bsize);
701 for (i = last + 1; i < NINDIR(fs); i++)
706 if (DOINGASYNC(vp)) {
714 bap1 = (ufs1_daddr_t *)copy;
716 bap2 = (ufs2_daddr_t *)copy;
720 * Recursively free totally unused blocks.
722 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
723 i--, nlbn += factor) {
727 if (level > SINGLE) {
728 if ((error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
729 (ufs2_daddr_t)-1, level - 1, &blkcount)) != 0)
731 blocksreleased += blkcount;
733 ffs_blkfree(ITOUMP(ip), fs, ITODEVVP(ip), nb, fs->fs_bsize,
734 ip->i_number, vp->v_type, NULL);
735 blocksreleased += nblocks;
739 * Recursively free last partial block.
741 if (level > SINGLE && lastbn >= 0) {
742 last = lastbn % factor;
745 error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
746 last, level - 1, &blkcount);
749 blocksreleased += blkcount;
755 bp->b_flags |= B_INVAL | B_NOCACHE;
759 *countp = blocksreleased;
764 ffs_rdonly(struct inode *ip)
767 return (ITOFS(ip)->fs_ronly != 0);