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29 * @(#)ffs_inode.c 8.13 (Berkeley) 4/21/95
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include "opt_quota.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mount.h>
43 #include <sys/vnode.h>
44 #include <sys/malloc.h>
45 #include <sys/resourcevar.h>
46 #include <sys/vmmeter.h>
50 #include <vm/vm_extern.h>
51 #include <vm/vm_object.h>
53 #include <ufs/ufs/extattr.h>
54 #include <ufs/ufs/quota.h>
55 #include <ufs/ufs/ufsmount.h>
56 #include <ufs/ufs/inode.h>
57 #include <ufs/ufs/ufs_extern.h>
59 #include <ufs/ffs/fs.h>
60 #include <ufs/ffs/ffs_extern.h>
62 static int ffs_indirtrunc(struct inode *, ufs2_daddr_t, ufs2_daddr_t,
63 ufs2_daddr_t, int, ufs2_daddr_t *);
66 * Update the access, modified, and inode change times as specified by the
67 * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
68 * to disk if the IN_MODIFIED flag is set (it may be set initially, or by
69 * the timestamp update). The IN_LAZYMOD flag is set to force a write
70 * later if not now. The IN_LAZYACCESS is set instead of IN_MODIFIED if the fs
71 * is currently being suspended (or is suspended) and vnode has been accessed.
72 * If we write now, then clear IN_MODIFIED, IN_LAZYACCESS and IN_LAZYMOD to
73 * reflect the presumably successful write, and if waitfor is set, then wait
74 * for the write to complete.
77 ffs_update(vp, waitfor)
86 ASSERT_VOP_ELOCKED(vp, "ffs_update");
89 if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
91 ip->i_flag &= ~(IN_LAZYACCESS | IN_LAZYMOD | IN_MODIFIED);
93 if (fs->fs_ronly && ip->i_ump->um_fsckpid == 0)
96 * If we are updating a snapshot and another process is currently
97 * writing the buffer containing the inode for this snapshot then
98 * a deadlock can occur when it tries to check the snapshot to see
99 * if that block needs to be copied. Thus when updating a snapshot
100 * we check to see if the buffer is already locked, and if it is
101 * we drop the snapshot lock until the buffer has been written
102 * and is available to us. We have to grab a reference to the
103 * snapshot vnode to prevent it from being removed while we are
104 * waiting for the buffer.
108 flags = GB_LOCK_NOWAIT;
110 error = breadn_flags(ip->i_devvp,
111 fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
112 (int) fs->fs_bsize, 0, 0, 0, NOCRED, flags, &bp);
114 if (error != EBUSY) {
118 KASSERT((IS_SNAPSHOT(ip)), ("EBUSY from non-snapshot"));
120 * Wait for our inode block to become available.
122 * Hold a reference to the vnode to protect against
123 * ffs_snapgone(). Since we hold a reference, it can only
124 * get reclaimed (VI_DOOMED flag) in a forcible downgrade
125 * or unmount. For an unmount, the entire filesystem will be
126 * gone, so we cannot attempt to touch anything associated
127 * with it while the vnode is unlocked; all we can do is
128 * pause briefly and try again. If when we relock the vnode
129 * we discover that it has been reclaimed, updating it is no
130 * longer necessary and we can just return an error.
135 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
137 if ((vp->v_iflag & VI_DOOMED) != 0)
141 if (DOINGSOFTDEP(vp))
142 softdep_update_inodeblock(ip, bp, waitfor);
143 else if (ip->i_effnlink != ip->i_nlink)
144 panic("ffs_update: bad link cnt");
145 if (ip->i_ump->um_fstype == UFS1)
146 *((struct ufs1_dinode *)bp->b_data +
147 ino_to_fsbo(fs, ip->i_number)) = *ip->i_din1;
149 *((struct ufs2_dinode *)bp->b_data +
150 ino_to_fsbo(fs, ip->i_number)) = *ip->i_din2;
151 if (waitfor && !DOINGASYNC(vp))
153 else if (vm_page_count_severe() || buf_dirty_count_severe()) {
157 if (bp->b_bufsize == fs->fs_bsize)
158 bp->b_flags |= B_CLUSTEROK;
165 #define SINGLE 0 /* index of single indirect block */
166 #define DOUBLE 1 /* index of double indirect block */
167 #define TRIPLE 2 /* index of triple indirect block */
169 * Truncate the inode ip to at most length size, freeing the
173 ffs_truncate(vp, length, flags, cred, td)
181 ufs2_daddr_t bn, lbn, lastblock, lastiblock[NIADDR], indir_lbn[NIADDR];
182 ufs2_daddr_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
183 ufs2_daddr_t count, blocksreleased = 0, datablocks;
187 struct ufsmount *ump;
188 int softdeptrunc, journaltrunc;
189 int needextclean, extblocks;
190 int offset, size, level, nblocks;
191 int i, error, allerror;
199 ASSERT_VOP_LOCKED(vp, "ffs_truncate");
203 if (length > fs->fs_maxfilesize)
206 error = getinoquota(ip);
211 * Historically clients did not have to specify which data
212 * they were truncating. So, if not specified, we assume
213 * traditional behavior, e.g., just the normal data.
215 if ((flags & (IO_EXT | IO_NORMAL)) == 0)
217 if (!DOINGSOFTDEP(vp) && !DOINGASYNC(vp))
220 * If we are truncating the extended-attributes, and cannot
221 * do it with soft updates, then do it slowly here. If we are
222 * truncating both the extended attributes and the file contents
223 * (e.g., the file is being unlinked), then pick it off with
224 * soft updates below.
229 journaltrunc = DOINGSUJ(vp);
230 if (journaltrunc == 0 && DOINGSOFTDEP(vp) && length == 0)
231 softdeptrunc = !softdep_slowdown(vp);
233 datablocks = DIP(ip, i_blocks);
234 if (fs->fs_magic == FS_UFS2_MAGIC && ip->i_din2->di_extsize > 0) {
235 extblocks = btodb(fragroundup(fs, ip->i_din2->di_extsize));
236 datablocks -= extblocks;
238 if ((flags & IO_EXT) && extblocks > 0) {
240 panic("ffs_truncate: partial trunc of extdata");
241 if (softdeptrunc || journaltrunc) {
242 if ((flags & IO_NORMAL) == 0)
246 if ((error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
249 (void) chkdq(ip, -extblocks, NOCRED, 0);
251 vinvalbuf(vp, V_ALT, 0, 0);
253 OFF_TO_IDX(lblktosize(fs, -extblocks)), 0);
254 osize = ip->i_din2->di_extsize;
255 ip->i_din2->di_blocks -= extblocks;
256 ip->i_din2->di_extsize = 0;
257 for (i = 0; i < NXADDR; i++) {
258 oldblks[i] = ip->i_din2->di_extb[i];
259 ip->i_din2->di_extb[i] = 0;
261 ip->i_flag |= IN_CHANGE;
262 if ((error = ffs_update(vp, !DOINGASYNC(vp))))
264 for (i = 0; i < NXADDR; i++) {
267 ffs_blkfree(ump, fs, ip->i_devvp, oldblks[i],
268 sblksize(fs, osize, i), ip->i_number,
273 if ((flags & IO_NORMAL) == 0)
275 if (vp->v_type == VLNK &&
276 (ip->i_size < vp->v_mount->mnt_maxsymlinklen ||
280 panic("ffs_truncate: partial truncate of symlink");
282 bzero(SHORTLINK(ip), (u_int)ip->i_size);
284 DIP_SET(ip, i_size, 0);
285 ip->i_flag |= IN_CHANGE | IN_UPDATE;
288 return (ffs_update(vp, !DOINGASYNC(vp)));
290 if (ip->i_size == length) {
291 ip->i_flag |= IN_CHANGE | IN_UPDATE;
294 return (ffs_update(vp, 0));
297 panic("ffs_truncate: read-only filesystem");
300 vp->v_lasta = vp->v_clen = vp->v_cstart = vp->v_lastw = 0;
303 * Lengthen the size of the file. We must ensure that the
304 * last byte of the file is allocated. Since the smallest
305 * value of osize is 0, length will be at least 1.
307 if (osize < length) {
308 vnode_pager_setsize(vp, length);
310 error = UFS_BALLOC(vp, length - 1, 1, cred, flags, &bp);
312 vnode_pager_setsize(vp, osize);
316 DIP_SET(ip, i_size, length);
317 if (bp->b_bufsize == fs->fs_bsize)
318 bp->b_flags |= B_CLUSTEROK;
321 else if (DOINGASYNC(vp))
325 ip->i_flag |= IN_CHANGE | IN_UPDATE;
326 return (ffs_update(vp, !DOINGASYNC(vp)));
328 if (DOINGSOFTDEP(vp)) {
329 if (softdeptrunc == 0 && journaltrunc == 0) {
331 * If a file is only partially truncated, then
332 * we have to clean up the data structures
333 * describing the allocation past the truncation
334 * point. Finding and deallocating those structures
335 * is a lot of work. Since partial truncation occurs
336 * rarely, we solve the problem by syncing the file
337 * so that it will have no data structures left.
339 if ((error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
342 flags = IO_NORMAL | (needextclean ? IO_EXT: 0);
344 softdep_journal_freeblocks(ip, cred, length,
347 softdep_setup_freeblocks(ip, length, flags);
348 ASSERT_VOP_LOCKED(vp, "ffs_truncate1");
349 if (journaltrunc == 0) {
350 ip->i_flag |= IN_CHANGE | IN_UPDATE;
351 error = ffs_update(vp, 0);
357 * Shorten the size of the file. If the file is not being
358 * truncated to a block boundary, the contents of the
359 * partial block following the end of the file must be
360 * zero'ed in case it ever becomes accessible again because
361 * of subsequent file growth. Directories however are not
362 * zero'ed as they should grow back initialized to empty.
364 offset = blkoff(fs, length);
367 DIP_SET(ip, i_size, length);
369 lbn = lblkno(fs, length);
371 error = UFS_BALLOC(vp, length - 1, 1, cred, flags, &bp);
375 * When we are doing soft updates and the UFS_BALLOC
376 * above fills in a direct block hole with a full sized
377 * block that will be truncated down to a fragment below,
378 * we must flush out the block dependency with an FSYNC
379 * so that we do not get a soft updates inconsistency
380 * when we create the fragment below.
382 if (DOINGSOFTDEP(vp) && lbn < NDADDR &&
383 fragroundup(fs, blkoff(fs, length)) < fs->fs_bsize &&
384 (error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
387 DIP_SET(ip, i_size, length);
388 size = blksize(fs, ip, lbn);
389 if (vp->v_type != VDIR)
390 bzero((char *)bp->b_data + offset,
391 (u_int)(size - offset));
392 /* Kirk's code has reallocbuf(bp, size, 1) here */
394 if (bp->b_bufsize == fs->fs_bsize)
395 bp->b_flags |= B_CLUSTEROK;
398 else if (DOINGASYNC(vp))
404 * Calculate index into inode's block list of
405 * last direct and indirect blocks (if any)
406 * which we want to keep. Lastblock is -1 when
407 * the file is truncated to 0.
409 lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1;
410 lastiblock[SINGLE] = lastblock - NDADDR;
411 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
412 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
413 nblocks = btodb(fs->fs_bsize);
415 * Update file and block pointers on disk before we start freeing
416 * blocks. If we crash before free'ing blocks below, the blocks
417 * will be returned to the free list. lastiblock values are also
418 * normalized to -1 for calls to ffs_indirtrunc below.
420 for (level = TRIPLE; level >= SINGLE; level--) {
421 oldblks[NDADDR + level] = DIP(ip, i_ib[level]);
422 if (lastiblock[level] < 0) {
423 DIP_SET(ip, i_ib[level], 0);
424 lastiblock[level] = -1;
427 for (i = 0; i < NDADDR; i++) {
428 oldblks[i] = DIP(ip, i_db[i]);
430 DIP_SET(ip, i_db[i], 0);
432 ip->i_flag |= IN_CHANGE | IN_UPDATE;
433 allerror = ffs_update(vp, !DOINGASYNC(vp));
436 * Having written the new inode to disk, save its new configuration
437 * and put back the old block pointers long enough to process them.
438 * Note that we save the new block configuration so we can check it
441 for (i = 0; i < NDADDR; i++) {
442 newblks[i] = DIP(ip, i_db[i]);
443 DIP_SET(ip, i_db[i], oldblks[i]);
445 for (i = 0; i < NIADDR; i++) {
446 newblks[NDADDR + i] = DIP(ip, i_ib[i]);
447 DIP_SET(ip, i_ib[i], oldblks[NDADDR + i]);
450 DIP_SET(ip, i_size, osize);
452 error = vtruncbuf(vp, cred, td, length, fs->fs_bsize);
453 if (error && (allerror == 0))
457 * Indirect blocks first.
459 indir_lbn[SINGLE] = -NDADDR;
460 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
461 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
462 for (level = TRIPLE; level >= SINGLE; level--) {
463 bn = DIP(ip, i_ib[level]);
465 error = ffs_indirtrunc(ip, indir_lbn[level],
466 fsbtodb(fs, bn), lastiblock[level], level, &count);
469 blocksreleased += count;
470 if (lastiblock[level] < 0) {
471 DIP_SET(ip, i_ib[level], 0);
472 ffs_blkfree(ump, fs, ip->i_devvp, bn,
473 fs->fs_bsize, ip->i_number,
475 blocksreleased += nblocks;
478 if (lastiblock[level] >= 0)
483 * All whole direct blocks or frags.
485 for (i = NDADDR - 1; i > lastblock; i--) {
488 bn = DIP(ip, i_db[i]);
491 DIP_SET(ip, i_db[i], 0);
492 bsize = blksize(fs, ip, i);
493 ffs_blkfree(ump, fs, ip->i_devvp, bn, bsize, ip->i_number,
495 blocksreleased += btodb(bsize);
501 * Finally, look for a change in size of the
502 * last direct block; release any frags.
504 bn = DIP(ip, i_db[lastblock]);
506 long oldspace, newspace;
509 * Calculate amount of space we're giving
510 * back as old block size minus new block size.
512 oldspace = blksize(fs, ip, lastblock);
514 DIP_SET(ip, i_size, length);
515 newspace = blksize(fs, ip, lastblock);
517 panic("ffs_truncate: newspace");
518 if (oldspace - newspace > 0) {
520 * Block number of space to be free'd is
521 * the old block # plus the number of frags
522 * required for the storage we're keeping.
524 bn += numfrags(fs, newspace);
525 ffs_blkfree(ump, fs, ip->i_devvp, bn,
526 oldspace - newspace, ip->i_number, vp->v_type, NULL);
527 blocksreleased += btodb(oldspace - newspace);
532 for (level = SINGLE; level <= TRIPLE; level++)
533 if (newblks[NDADDR + level] != DIP(ip, i_ib[level]))
534 panic("ffs_truncate1");
535 for (i = 0; i < NDADDR; i++)
536 if (newblks[i] != DIP(ip, i_db[i]))
537 panic("ffs_truncate2");
540 (fs->fs_magic != FS_UFS2_MAGIC || ip->i_din2->di_extsize == 0) &&
541 (bo->bo_dirty.bv_cnt > 0 || bo->bo_clean.bv_cnt > 0))
542 panic("ffs_truncate3");
544 #endif /* INVARIANTS */
546 * Put back the real size.
549 DIP_SET(ip, i_size, length);
550 if (DIP(ip, i_blocks) >= blocksreleased)
551 DIP_SET(ip, i_blocks, DIP(ip, i_blocks) - blocksreleased);
553 DIP_SET(ip, i_blocks, 0);
554 ip->i_flag |= IN_CHANGE;
556 (void) chkdq(ip, -blocksreleased, NOCRED, 0);
562 softdep_journal_freeblocks(ip, cred, length, IO_EXT);
564 softdep_setup_freeblocks(ip, length, IO_EXT);
565 return (ffs_update(vp, !DOINGASYNC(vp)));
569 * Release blocks associated with the inode ip and stored in the indirect
570 * block bn. Blocks are free'd in LIFO order up to (but not including)
571 * lastbn. If level is greater than SINGLE, the block is an indirect block
572 * and recursive calls to indirtrunc must be used to cleanse other indirect
576 ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
578 ufs2_daddr_t lbn, lastbn;
581 ufs2_daddr_t *countp;
584 struct fs *fs = ip->i_fs;
587 int i, nblocks, error = 0, allerror = 0;
588 ufs2_daddr_t nb, nlbn, last;
589 ufs2_daddr_t blkcount, factor, blocksreleased = 0;
590 ufs1_daddr_t *bap1 = NULL;
591 ufs2_daddr_t *bap2 = NULL;
592 # define BAP(ip, i) (((ip)->i_ump->um_fstype == UFS1) ? bap1[i] : bap2[i])
595 * Calculate index in current block of last
596 * block to be kept. -1 indicates the entire
597 * block so we need not calculate the index.
599 factor = lbn_offset(fs, level);
603 nblocks = btodb(fs->fs_bsize);
605 * Get buffer of block pointers, zero those entries corresponding
606 * to blocks to be free'd, and update on disk copy first. Since
607 * double(triple) indirect before single(double) indirect, calls
608 * to bmap on these blocks will fail. However, we already have
609 * the on disk address, so we have to set the b_blkno field
610 * explicitly instead of letting bread do everything for us.
613 bp = getblk(vp, lbn, (int)fs->fs_bsize, 0, 0, 0);
614 if ((bp->b_flags & B_CACHE) == 0) {
615 curthread->td_ru.ru_inblock++; /* pay for read */
616 bp->b_iocmd = BIO_READ;
617 bp->b_flags &= ~B_INVAL;
618 bp->b_ioflags &= ~BIO_ERROR;
619 if (bp->b_bcount > bp->b_bufsize)
620 panic("ffs_indirtrunc: bad buffer size");
622 vfs_busy_pages(bp, 0);
623 bp->b_iooffset = dbtob(bp->b_blkno);
633 if (ip->i_ump->um_fstype == UFS1)
634 bap1 = (ufs1_daddr_t *)bp->b_data;
636 bap2 = (ufs2_daddr_t *)bp->b_data;
638 copy = malloc(fs->fs_bsize, M_TEMP, M_WAITOK);
639 bcopy((caddr_t)bp->b_data, copy, (u_int)fs->fs_bsize);
640 for (i = last + 1; i < NINDIR(fs); i++)
641 if (ip->i_ump->um_fstype == UFS1)
645 if (DOINGASYNC(vp)) {
652 if (ip->i_ump->um_fstype == UFS1)
653 bap1 = (ufs1_daddr_t *)copy;
655 bap2 = (ufs2_daddr_t *)copy;
659 * Recursively free totally unused blocks.
661 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
662 i--, nlbn += factor) {
666 if (level > SINGLE) {
667 if ((error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
668 (ufs2_daddr_t)-1, level - 1, &blkcount)) != 0)
670 blocksreleased += blkcount;
672 ffs_blkfree(ip->i_ump, fs, ip->i_devvp, nb, fs->fs_bsize,
673 ip->i_number, vp->v_type, NULL);
674 blocksreleased += nblocks;
678 * Recursively free last partial block.
680 if (level > SINGLE && lastbn >= 0) {
681 last = lastbn % factor;
684 error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
685 last, level - 1, &blkcount);
688 blocksreleased += blkcount;
694 bp->b_flags |= B_INVAL | B_NOCACHE;
698 *countp = blocksreleased;
703 ffs_rdonly(struct inode *ip)
706 return (ip->i_ump->um_fs->fs_ronly != 0);