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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 1.5 2003/06/26 20:27:52 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, &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, td)
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, MNT_WAIT, td)) != 0)
196 (void) chkdq(oip, -oip->i_blocks, NOCRED, 0);
198 softdep_setup_freeblocks(oip, length);
199 vinvalbuf(ovp, 0, td, 0, 0);
200 oip->i_flag |= IN_CHANGE | IN_UPDATE;
201 return (ffs_update(ovp, 0));
206 * Lengthen the size of the file. We must ensure that the
207 * last byte of the file is allocated. Since the smallest
208 * value of osize is 0, length will be at least 1.
210 if (osize < length) {
211 vnode_pager_setsize(ovp, length);
215 error = VOP_BALLOC(ovp, length - 1, 1,
219 oip->i_size = length;
220 if (bp->b_bufsize == fs->fs_bsize)
221 bp->b_flags |= B_CLUSTEROK;
226 oip->i_flag |= IN_CHANGE | IN_UPDATE;
227 return (UFS_UPDATE(ovp, 1));
230 * Shorten the size of the file. If the file is not being
231 * truncated to a block boundary, the contents of the
232 * partial block following the end of the file must be
233 * zero'ed in case it ever becomes accessible again because
234 * of subsequent file growth. Directories however are not
235 * zero'ed as they should grow back initialized to empty.
237 offset = blkoff(fs, length);
239 oip->i_size = length;
241 lbn = lblkno(fs, length);
245 error = VOP_BALLOC(ovp, length - 1, 1, cred, aflags, &bp);
250 * When we are doing soft updates and the UFS_BALLOC
251 * above fills in a direct block hole with a full sized
252 * block that will be truncated down to a fragment below,
253 * we must flush out the block dependency with an FSYNC
254 * so that we do not get a soft updates inconsistency
255 * when we create the fragment below.
257 if (DOINGSOFTDEP(ovp) && lbn < NDADDR &&
258 fragroundup(fs, blkoff(fs, length)) < fs->fs_bsize &&
259 (error = VOP_FSYNC(ovp, MNT_WAIT, td)) != 0) {
262 oip->i_size = length;
263 size = blksize(fs, oip, lbn);
264 if (ovp->v_type != VDIR)
265 bzero((char *)bp->b_data + offset,
266 (u_int)(size - offset));
267 /* Kirk's code has reallocbuf(bp, size, 1) here */
269 if (bp->b_bufsize == fs->fs_bsize)
270 bp->b_flags |= B_CLUSTEROK;
277 * Calculate index into inode's block list of
278 * last direct and indirect blocks (if any)
279 * which we want to keep. Lastblock is -1 when
280 * the file is truncated to 0.
282 lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1;
283 lastiblock[SINGLE] = lastblock - NDADDR;
284 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
285 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
286 nblocks = btodb(fs->fs_bsize);
288 * Update file and block pointers on disk before we start freeing
289 * blocks. If we crash before free'ing blocks below, the blocks
290 * will be returned to the free list. lastiblock values are also
291 * normalized to -1 for calls to ffs_indirtrunc below.
293 bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks);
294 for (level = TRIPLE; level >= SINGLE; level--)
295 if (lastiblock[level] < 0) {
296 oip->i_ib[level] = 0;
297 lastiblock[level] = -1;
299 for (i = NDADDR - 1; i > lastblock; i--)
301 oip->i_flag |= IN_CHANGE | IN_UPDATE;
302 allerror = UFS_UPDATE(ovp, 1);
305 * Having written the new inode to disk, save its new configuration
306 * and put back the old block pointers long enough to process them.
307 * Note that we save the new block configuration so we can check it
310 bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks);
311 bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks);
314 error = vtruncbuf(ovp, td, length, fs->fs_bsize);
315 if (error && (allerror == 0))
319 * Indirect blocks first.
321 indir_lbn[SINGLE] = -NDADDR;
322 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
323 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
324 for (level = TRIPLE; level >= SINGLE; level--) {
325 bn = oip->i_ib[level];
327 error = ffs_indirtrunc(oip, indir_lbn[level],
328 fsbtodb(fs, bn), lastiblock[level], level, &count);
331 blocksreleased += count;
332 if (lastiblock[level] < 0) {
333 oip->i_ib[level] = 0;
334 ffs_blkfree(oip, bn, fs->fs_bsize);
335 blocksreleased += nblocks;
338 if (lastiblock[level] >= 0)
343 * All whole direct blocks or frags.
345 for (i = NDADDR - 1; i > lastblock; i--) {
352 bsize = blksize(fs, oip, i);
353 ffs_blkfree(oip, bn, bsize);
354 blocksreleased += btodb(bsize);
360 * Finally, look for a change in size of the
361 * last direct block; release any frags.
363 bn = oip->i_db[lastblock];
365 long oldspace, newspace;
368 * Calculate amount of space we're giving
369 * back as old block size minus new block size.
371 oldspace = blksize(fs, oip, lastblock);
372 oip->i_size = length;
373 newspace = blksize(fs, oip, lastblock);
375 panic("ffs_truncate: newspace");
376 if (oldspace - newspace > 0) {
378 * Block number of space to be free'd is
379 * the old block # plus the number of frags
380 * required for the storage we're keeping.
382 bn += numfrags(fs, newspace);
383 ffs_blkfree(oip, bn, oldspace - newspace);
384 blocksreleased += btodb(oldspace - newspace);
389 for (level = SINGLE; level <= TRIPLE; level++)
390 if (newblks[NDADDR + level] != oip->i_ib[level])
391 panic("ffs_truncate1");
392 for (i = 0; i < NDADDR; i++)
393 if (newblks[i] != oip->i_db[i])
394 panic("ffs_truncate2");
396 (!TAILQ_EMPTY(&ovp->v_dirtyblkhd) ||
397 !TAILQ_EMPTY(&ovp->v_cleanblkhd)))
398 panic("ffs_truncate3");
399 #endif /* DIAGNOSTIC */
401 * Put back the real size.
403 oip->i_size = length;
404 oip->i_blocks -= blocksreleased;
406 if (oip->i_blocks < 0) /* sanity */
408 oip->i_flag |= IN_CHANGE;
410 (void) chkdq(oip, -blocksreleased, NOCRED, 0);
416 * Release blocks associated with the inode ip and stored in the indirect
417 * block bn. Blocks are free'd in LIFO order up to (but not including)
418 * lastbn. If level is greater than SINGLE, the block is an indirect block
419 * and recursive calls to indirtrunc must be used to cleanse other indirect
422 * NB: triple indirect blocks are untested.
425 ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
426 register struct inode *ip;
427 ufs_daddr_t lbn, lastbn;
434 register struct fs *fs = ip->i_fs;
435 register ufs_daddr_t *bap;
437 ufs_daddr_t *copy = NULL, nb, nlbn, last;
438 long blkcount, factor;
439 int nblocks, blocksreleased = 0;
440 int error = 0, allerror = 0;
443 * Calculate index in current block of last
444 * block to be kept. -1 indicates the entire
445 * block so we need not calculate the index.
448 for (i = SINGLE; i < level; i++)
449 factor *= NINDIR(fs);
453 nblocks = btodb(fs->fs_bsize);
455 * Get buffer of block pointers, zero those entries corresponding
456 * to blocks to be free'd, and update on disk copy first. Since
457 * double(triple) indirect before single(double) indirect, calls
458 * to bmap on these blocks will fail. However, we already have
459 * the on disk address, so we have to set the b_blkno field
460 * explicitly instead of letting bread do everything for us.
463 bp = getblk(vp, lbn, (int)fs->fs_bsize, 0, 0);
464 if ((bp->b_flags & B_CACHE) == 0) {
465 bp->b_flags |= B_READ;
466 bp->b_flags &= ~(B_ERROR|B_INVAL);
467 if (bp->b_bcount > bp->b_bufsize)
468 panic("ffs_indirtrunc: bad buffer size");
470 vfs_busy_pages(bp, 0);
471 VOP_STRATEGY(bp->b_vp, bp);
480 bap = (ufs_daddr_t *)bp->b_data;
482 MALLOC(copy, ufs_daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK);
483 bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize);
484 bzero((caddr_t)&bap[last + 1],
485 (u_int)(NINDIR(fs) - (last + 1)) * sizeof (ufs_daddr_t));
486 if (DOINGASYNC(vp)) {
497 * Recursively free totally unused blocks.
499 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
500 i--, nlbn += factor) {
504 if (level > SINGLE) {
505 if ((error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
506 (ufs_daddr_t)-1, level - 1, &blkcount)) != 0)
508 blocksreleased += blkcount;
510 ffs_blkfree(ip, nb, fs->fs_bsize);
511 blocksreleased += nblocks;
515 * Recursively free last partial block.
517 if (level > SINGLE && lastbn >= 0) {
518 last = lastbn % factor;
521 error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
522 last, level - 1, &blkcount);
525 blocksreleased += blkcount;
531 bp->b_flags |= B_INVAL | B_NOCACHE;
535 *countp = blocksreleased;