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33 * @(#)ffs_inode.c 8.13 (Berkeley) 4/21/95
34 * $FreeBSD: src/sys/ufs/ffs/ffs_inode.c,v 1.56.2.5 2002/02/05 18:35:03 dillon Exp $
35 * $DragonFly: src/sys/vfs/ufs/ffs_inode.c,v 1.2 2003/06/17 04:28:59 dillon Exp $
38 #include "opt_quota.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/mount.h>
45 #include <sys/vnode.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
48 #include <sys/resourcevar.h>
49 #include <sys/vmmeter.h>
52 #include <vm/vm_extern.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 __P((struct inode *, ufs_daddr_t, ufs_daddr_t,
63 ufs_daddr_t, int, long *));
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. If we write now, then clear both IN_MODIFIED and
71 * IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
72 * set, then wait for the write to complete.
75 ffs_update(vp, waitfor)
79 register struct fs *fs;
86 if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
88 ip->i_flag &= ~(IN_LAZYMOD | IN_MODIFIED);
93 * Ensure that uid and gid are correct. This is a temporary
94 * fix until fsck has been changed to do the update.
96 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
97 ip->i_din.di_ouid = ip->i_uid; /* XXX */
98 ip->i_din.di_ogid = ip->i_gid; /* XXX */
100 error = bread(ip->i_devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
101 (int)fs->fs_bsize, NOCRED, &bp);
106 if (DOINGSOFTDEP(vp))
107 softdep_update_inodeblock(ip, bp, waitfor);
108 else if (ip->i_effnlink != ip->i_nlink)
109 panic("ffs_update: bad link cnt");
110 *((struct dinode *)bp->b_data +
111 ino_to_fsbo(fs, ip->i_number)) = ip->i_din;
112 if (waitfor && !DOINGASYNC(vp)) {
114 } else if (vm_page_count_severe() || buf_dirty_count_severe()) {
117 if (bp->b_bufsize == fs->fs_bsize)
118 bp->b_flags |= B_CLUSTEROK;
124 #define SINGLE 0 /* index of single indirect block */
125 #define DOUBLE 1 /* index of double indirect block */
126 #define TRIPLE 2 /* index of triple indirect block */
128 * Truncate the inode oip to at most length size, freeing the
132 ffs_truncate(vp, length, flags, cred, p)
139 register struct vnode *ovp = vp;
140 ufs_daddr_t lastblock;
141 register struct inode *oip;
142 ufs_daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
143 ufs_daddr_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
144 register struct fs *fs;
146 int offset, size, level;
147 long count, nblocks, blocksreleased = 0;
149 int aflags, error, allerror;
156 if (length > fs->fs_maxfilesize)
158 if (ovp->v_type == VLNK &&
159 (oip->i_size < ovp->v_mount->mnt_maxsymlinklen || oip->i_din.di_blocks == 0)) {
162 panic("ffs_truncate: partial truncate of symlink");
164 bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
166 oip->i_flag |= IN_CHANGE | IN_UPDATE;
167 return (UFS_UPDATE(ovp, 1));
169 if (oip->i_size == length) {
170 oip->i_flag |= IN_CHANGE | IN_UPDATE;
171 return (UFS_UPDATE(ovp, 0));
174 panic("ffs_truncate: read-only filesystem");
176 error = getinoquota(oip);
180 ovp->v_lasta = ovp->v_clen = ovp->v_cstart = ovp->v_lastw = 0;
181 if (DOINGSOFTDEP(ovp)) {
182 if (length > 0 || softdep_slowdown(ovp)) {
184 * If a file is only partially truncated, then
185 * we have to clean up the data structures
186 * describing the allocation past the truncation
187 * point. Finding and deallocating those structures
188 * is a lot of work. Since partial truncation occurs
189 * rarely, we solve the problem by syncing the file
190 * so that it will have no data structures left.
192 if ((error = VOP_FSYNC(ovp, cred, MNT_WAIT,
197 (void) chkdq(oip, -oip->i_blocks, NOCRED, 0);
199 softdep_setup_freeblocks(oip, length);
200 vinvalbuf(ovp, 0, cred, p, 0, 0);
201 oip->i_flag |= IN_CHANGE | IN_UPDATE;
202 return (ffs_update(ovp, 0));
207 * Lengthen the size of the file. We must ensure that the
208 * last byte of the file is allocated. Since the smallest
209 * value of osize is 0, length will be at least 1.
211 if (osize < length) {
212 vnode_pager_setsize(ovp, length);
216 error = VOP_BALLOC(ovp, length - 1, 1,
220 oip->i_size = length;
221 if (bp->b_bufsize == fs->fs_bsize)
222 bp->b_flags |= B_CLUSTEROK;
227 oip->i_flag |= IN_CHANGE | IN_UPDATE;
228 return (UFS_UPDATE(ovp, 1));
231 * Shorten the size of the file. If the file is not being
232 * truncated to a block boundary, the contents of the
233 * partial block following the end of the file must be
234 * zero'ed in case it ever becomes accessible again because
235 * of subsequent file growth. Directories however are not
236 * zero'ed as they should grow back initialized to empty.
238 offset = blkoff(fs, length);
240 oip->i_size = length;
242 lbn = lblkno(fs, length);
246 error = VOP_BALLOC(ovp, length - 1, 1, cred, aflags, &bp);
251 * When we are doing soft updates and the UFS_BALLOC
252 * above fills in a direct block hole with a full sized
253 * block that will be truncated down to a fragment below,
254 * we must flush out the block dependency with an FSYNC
255 * so that we do not get a soft updates inconsistency
256 * when we create the fragment below.
258 if (DOINGSOFTDEP(ovp) && lbn < NDADDR &&
259 fragroundup(fs, blkoff(fs, length)) < fs->fs_bsize &&
260 (error = VOP_FSYNC(ovp, cred, MNT_WAIT, p)) != 0) {
263 oip->i_size = length;
264 size = blksize(fs, oip, lbn);
265 if (ovp->v_type != VDIR)
266 bzero((char *)bp->b_data + offset,
267 (u_int)(size - offset));
268 /* Kirk's code has reallocbuf(bp, size, 1) here */
270 if (bp->b_bufsize == fs->fs_bsize)
271 bp->b_flags |= B_CLUSTEROK;
278 * Calculate index into inode's block list of
279 * last direct and indirect blocks (if any)
280 * which we want to keep. Lastblock is -1 when
281 * the file is truncated to 0.
283 lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1;
284 lastiblock[SINGLE] = lastblock - NDADDR;
285 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
286 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
287 nblocks = btodb(fs->fs_bsize);
289 * Update file and block pointers on disk before we start freeing
290 * blocks. If we crash before free'ing blocks below, the blocks
291 * will be returned to the free list. lastiblock values are also
292 * normalized to -1 for calls to ffs_indirtrunc below.
294 bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks);
295 for (level = TRIPLE; level >= SINGLE; level--)
296 if (lastiblock[level] < 0) {
297 oip->i_ib[level] = 0;
298 lastiblock[level] = -1;
300 for (i = NDADDR - 1; i > lastblock; i--)
302 oip->i_flag |= IN_CHANGE | IN_UPDATE;
303 allerror = UFS_UPDATE(ovp, 1);
306 * Having written the new inode to disk, save its new configuration
307 * and put back the old block pointers long enough to process them.
308 * Note that we save the new block configuration so we can check it
311 bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks);
312 bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks);
315 error = vtruncbuf(ovp, cred, p, length, fs->fs_bsize);
316 if (error && (allerror == 0))
320 * Indirect blocks first.
322 indir_lbn[SINGLE] = -NDADDR;
323 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
324 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
325 for (level = TRIPLE; level >= SINGLE; level--) {
326 bn = oip->i_ib[level];
328 error = ffs_indirtrunc(oip, indir_lbn[level],
329 fsbtodb(fs, bn), lastiblock[level], level, &count);
332 blocksreleased += count;
333 if (lastiblock[level] < 0) {
334 oip->i_ib[level] = 0;
335 ffs_blkfree(oip, bn, fs->fs_bsize);
336 blocksreleased += nblocks;
339 if (lastiblock[level] >= 0)
344 * All whole direct blocks or frags.
346 for (i = NDADDR - 1; i > lastblock; i--) {
353 bsize = blksize(fs, oip, i);
354 ffs_blkfree(oip, bn, bsize);
355 blocksreleased += btodb(bsize);
361 * Finally, look for a change in size of the
362 * last direct block; release any frags.
364 bn = oip->i_db[lastblock];
366 long oldspace, newspace;
369 * Calculate amount of space we're giving
370 * back as old block size minus new block size.
372 oldspace = blksize(fs, oip, lastblock);
373 oip->i_size = length;
374 newspace = blksize(fs, oip, lastblock);
376 panic("ffs_truncate: newspace");
377 if (oldspace - newspace > 0) {
379 * Block number of space to be free'd is
380 * the old block # plus the number of frags
381 * required for the storage we're keeping.
383 bn += numfrags(fs, newspace);
384 ffs_blkfree(oip, bn, oldspace - newspace);
385 blocksreleased += btodb(oldspace - newspace);
390 for (level = SINGLE; level <= TRIPLE; level++)
391 if (newblks[NDADDR + level] != oip->i_ib[level])
392 panic("ffs_truncate1");
393 for (i = 0; i < NDADDR; i++)
394 if (newblks[i] != oip->i_db[i])
395 panic("ffs_truncate2");
397 (!TAILQ_EMPTY(&ovp->v_dirtyblkhd) ||
398 !TAILQ_EMPTY(&ovp->v_cleanblkhd)))
399 panic("ffs_truncate3");
400 #endif /* DIAGNOSTIC */
402 * Put back the real size.
404 oip->i_size = length;
405 oip->i_blocks -= blocksreleased;
407 if (oip->i_blocks < 0) /* sanity */
409 oip->i_flag |= IN_CHANGE;
411 (void) chkdq(oip, -blocksreleased, NOCRED, 0);
417 * Release blocks associated with the inode ip and stored in the indirect
418 * block bn. Blocks are free'd in LIFO order up to (but not including)
419 * lastbn. If level is greater than SINGLE, the block is an indirect block
420 * and recursive calls to indirtrunc must be used to cleanse other indirect
423 * NB: triple indirect blocks are untested.
426 ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
427 register struct inode *ip;
428 ufs_daddr_t lbn, lastbn;
435 register struct fs *fs = ip->i_fs;
436 register ufs_daddr_t *bap;
438 ufs_daddr_t *copy = NULL, nb, nlbn, last;
439 long blkcount, factor;
440 int nblocks, blocksreleased = 0;
441 int error = 0, allerror = 0;
444 * Calculate index in current block of last
445 * block to be kept. -1 indicates the entire
446 * block so we need not calculate the index.
449 for (i = SINGLE; i < level; i++)
450 factor *= NINDIR(fs);
454 nblocks = btodb(fs->fs_bsize);
456 * Get buffer of block pointers, zero those entries corresponding
457 * to blocks to be free'd, and update on disk copy first. Since
458 * double(triple) indirect before single(double) indirect, calls
459 * to bmap on these blocks will fail. However, we already have
460 * the on disk address, so we have to set the b_blkno field
461 * explicitly instead of letting bread do everything for us.
464 bp = getblk(vp, lbn, (int)fs->fs_bsize, 0, 0);
465 if ((bp->b_flags & B_CACHE) == 0) {
466 curproc->p_stats->p_ru.ru_inblock++; /* pay for read */
467 bp->b_flags |= B_READ;
468 bp->b_flags &= ~(B_ERROR|B_INVAL);
469 if (bp->b_bcount > bp->b_bufsize)
470 panic("ffs_indirtrunc: bad buffer size");
472 vfs_busy_pages(bp, 0);
473 VOP_STRATEGY(bp->b_vp, bp);
482 bap = (ufs_daddr_t *)bp->b_data;
484 MALLOC(copy, ufs_daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK);
485 bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize);
486 bzero((caddr_t)&bap[last + 1],
487 (u_int)(NINDIR(fs) - (last + 1)) * sizeof (ufs_daddr_t));
488 if (DOINGASYNC(vp)) {
499 * Recursively free totally unused blocks.
501 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
502 i--, nlbn += factor) {
506 if (level > SINGLE) {
507 if ((error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
508 (ufs_daddr_t)-1, level - 1, &blkcount)) != 0)
510 blocksreleased += blkcount;
512 ffs_blkfree(ip, nb, fs->fs_bsize);
513 blocksreleased += nblocks;
517 * Recursively free last partial block.
519 if (level > SINGLE && lastbn >= 0) {
520 last = lastbn % factor;
523 error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
524 last, level - 1, &blkcount);
527 blocksreleased += blkcount;
533 bp->b_flags |= B_INVAL | B_NOCACHE;
537 *countp = blocksreleased;