2 * modified for Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
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39 * @(#)ext2_inode.c 8.5 (Berkeley) 12/30/93
40 * $FreeBSD: src/sys/gnu/ext2fs/ext2_inode.c,v 1.24.2.1 2000/08/03 00:52:57 peter Exp $
41 * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_inode.c,v 1.19 2006/09/05 00:55:50 dillon Exp $
44 #include "opt_quota.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/mount.h>
50 #include <sys/vnode.h>
51 #include <sys/malloc.h>
54 #include <vm/vm_extern.h>
58 #include "ext2mount.h"
61 #include "ext2_fs_sb.h"
63 #include "ext2_extern.h"
65 static int ext2_indirtrunc (struct inode *, daddr_t, off_t, daddr_t,
69 * Update the access, modified, and inode change times as specified by the
70 * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
71 * to disk if the IN_MODIFIED flag is set (it may be set initially, or by
72 * the timestamp update). The IN_LAZYMOD flag is set to force a write
73 * later if not now. If we write now, then clear both IN_MODIFIED and
74 * IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
75 * set, then wait for the write to complete.
78 ext2_update(struct vnode *vp, int waitfor)
80 struct ext2_sb_info *fs;
87 if ((ip->i_flag & IN_MODIFIED) == 0)
89 ip->i_flag &= ~(IN_LAZYMOD | IN_MODIFIED);
90 if (vp->v_mount->mnt_flag & MNT_RDONLY)
93 error = bread(ip->i_devvp,
94 fsbtodoff(fs, ino_to_fsba(fs, ip->i_number)),
95 (int)fs->s_blocksize, &bp);
100 ext2_di2ei( &ip->i_din, (struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
101 ino_to_fsbo(fs, ip->i_number)));
103 if (waitfor && (vp->v_mount->mnt_flag & MNT_ASYNC) == 0)
114 #define SINGLE 0 /* index of single indirect block */
115 #define DOUBLE 1 /* index of double indirect block */
116 #define TRIPLE 2 /* index of triple indirect block */
118 * Truncate the inode oip to at most length size, freeing the
122 ext2_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred)
124 struct vnode *ovp = vp;
127 daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
128 daddr_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
129 struct ext2_sb_info *fs;
131 int offset, size, level;
132 long count, nblocks, blocksreleased = 0;
134 int aflags, error, allerror;
137 printf("ext2_truncate called %d to %d\n", VTOI(ovp)->i_number, length);
139 * negative file sizes will totally break the code below and
140 * are not meaningful anyways.
146 if (ovp->v_type == VLNK &&
147 oip->i_size < ovp->v_mount->mnt_maxsymlinklen) {
150 panic("ext2_truncate: partial truncate of symlink");
152 bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
154 oip->i_flag |= IN_CHANGE | IN_UPDATE;
155 return (EXT2_UPDATE(ovp, 1));
157 if (oip->i_size == length) {
158 oip->i_flag |= IN_CHANGE | IN_UPDATE;
159 return (EXT2_UPDATE(ovp, 0));
162 if ((error = ext2_getinoquota(oip)) != 0)
167 ext2_discard_prealloc(oip);
169 * Lengthen the size of the file. We must ensure that the
170 * last byte of the file is allocated. Since the smallest
171 * value of oszie is 0, length will be at least 1.
173 if (osize < length) {
174 offset = blkoff(fs, length - 1);
175 lbn = lblkno(fs, length - 1);
179 vnode_pager_setsize(ovp, length);
180 if ((error = ext2_balloc(oip, lbn, offset + 1, cred, &bp,
183 oip->i_size = length;
184 if (aflags & IO_SYNC)
188 oip->i_flag |= IN_CHANGE | IN_UPDATE;
189 return (EXT2_UPDATE(ovp, 1));
192 * Shorten the size of the file. If the file is not being
193 * truncated to a block boundry, the contents of the
194 * partial block following the end of the file must be
195 * zero'ed in case it ever become accessable again because
196 * of subsequent file growth.
198 /* I don't understand the comment above */
199 offset = blkoff(fs, length);
201 oip->i_size = length;
203 lbn = lblkno(fs, length);
207 if ((error = ext2_balloc(oip, lbn, offset, cred, &bp,
210 oip->i_size = length;
211 size = blksize(fs, oip, lbn);
212 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
214 if (aflags & IO_SYNC)
220 * Calculate index into inode's block list of
221 * last direct and indirect blocks (if any)
222 * which we want to keep. Lastblock is -1 when
223 * the file is truncated to 0.
225 lastblock = lblkno(fs, length + fs->s_blocksize - 1) - 1;
226 lastiblock[SINGLE] = lastblock - NDADDR;
227 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
228 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
229 nblocks = btodb(fs->s_blocksize);
231 * Update file and block pointers on disk before we start freeing
232 * blocks. If we crash before free'ing blocks below, the blocks
233 * will be returned to the free list. lastiblock values are also
234 * normalized to -1 for calls to ext2_indirtrunc below.
236 bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks);
237 for (level = TRIPLE; level >= SINGLE; level--)
238 if (lastiblock[level] < 0) {
239 oip->i_ib[level] = 0;
240 lastiblock[level] = -1;
242 for (i = NDADDR - 1; i > lastblock; i--)
244 oip->i_flag |= IN_CHANGE | IN_UPDATE;
245 allerror = EXT2_UPDATE(ovp, 1);
248 * Having written the new inode to disk, save its new configuration
249 * and put back the old block pointers long enough to process them.
250 * Note that we save the new block configuration so we can check it
253 bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks);
254 bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks);
256 error = vtruncbuf(ovp, length, (int)fs->s_blocksize);
257 if (error && (allerror == 0))
261 * Indirect blocks first.
263 indir_lbn[SINGLE] = -NDADDR;
264 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
265 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
266 for (level = TRIPLE; level >= SINGLE; level--) {
267 bn = oip->i_ib[level];
269 error = ext2_indirtrunc(oip, indir_lbn[level],
270 fsbtodoff(fs, bn), lastiblock[level], level, &count);
273 blocksreleased += count;
274 if (lastiblock[level] < 0) {
275 oip->i_ib[level] = 0;
276 ext2_blkfree(oip, bn, fs->s_frag_size);
277 blocksreleased += nblocks;
280 if (lastiblock[level] >= 0)
285 * All whole direct blocks or frags.
287 for (i = NDADDR - 1; i > lastblock; i--) {
294 bsize = blksize(fs, oip, i);
295 ext2_blkfree(oip, bn, bsize);
296 blocksreleased += btodb(bsize);
302 * Finally, look for a change in size of the
303 * last direct block; release any frags.
305 bn = oip->i_db[lastblock];
307 long oldspace, newspace;
310 * Calculate amount of space we're giving
311 * back as old block size minus new block size.
313 oldspace = blksize(fs, oip, lastblock);
314 oip->i_size = length;
315 newspace = blksize(fs, oip, lastblock);
317 panic("itrunc: newspace");
318 if (oldspace - newspace > 0) {
320 * Block number of space to be free'd is
321 * the old block # plus the number of frags
322 * required for the storage we're keeping.
324 bn += numfrags(fs, newspace);
325 ext2_blkfree(oip, bn, oldspace - newspace);
326 blocksreleased += btodb(oldspace - newspace);
331 for (level = SINGLE; level <= TRIPLE; level++)
332 if (newblks[NDADDR + level] != oip->i_ib[level])
334 for (i = 0; i < NDADDR; i++)
335 if (newblks[i] != oip->i_db[i])
337 if (length == 0 && (!RB_EMPTY(&ovp->v_rbdirty_tree) ||
338 !RB_EMPTY(&ovp->v_rbclean_tree)))
340 #endif /* DIAGNOSTIC */
342 * Put back the real size.
344 oip->i_size = length;
345 oip->i_blocks -= blocksreleased;
346 if (oip->i_blocks < 0) /* sanity */
348 oip->i_flag |= IN_CHANGE;
349 vnode_pager_setsize(ovp, length);
351 ext2_chkdq(oip, -blocksreleased, NOCRED, 0);
357 * Release blocks associated with the inode ip and stored in the indirect
358 * block bn. Blocks are free'd in LIFO order up to (but not including)
359 * lastbn. If level is greater than SINGLE, the block is an indirect block
360 * and recursive calls to indirtrunc must be used to cleanse other indirect
363 * NB: triple indirect blocks are untested.
367 ext2_indirtrunc(struct inode *ip, daddr_t lbn, off_t doffset, daddr_t lastbn,
368 int level, long *countp)
372 struct ext2_sb_info *fs = ip->i_e2fs;
375 daddr_t *copy, nb, nlbn, last;
376 long blkcount, factor;
377 int nblocks, blocksreleased = 0;
378 int error = 0, allerror = 0;
381 * Calculate index in current block of last
382 * block to be kept. -1 indicates the entire
383 * block so we need not calculate the index.
386 for (i = SINGLE; i < level; i++)
387 factor *= NINDIR(fs);
391 nblocks = btodb(fs->s_blocksize);
393 * Get buffer of block pointers, zero those entries corresponding
394 * to blocks to be free'd, and update on disk copy first. Since
395 * double(triple) indirect before single(double) indirect, calls
396 * to bmap on these blocks will fail. However, we already have
397 * the on disk address, so we have to set the bio_offset field
398 * explicitly instead of letting bread do everything for us.
401 bp = getblk(vp, lblktodoff(fs, lbn), (int)fs->s_blocksize, 0, 0);
402 if ((bp->b_flags & B_CACHE) == 0) {
403 bp->b_flags &= ~(B_ERROR | B_INVAL);
404 bp->b_cmd = BUF_CMD_READ;
405 if (bp->b_bcount > bp->b_bufsize)
406 panic("ext2_indirtrunc: bad buffer size");
407 bp->b_bio2.bio_offset = doffset;
408 vfs_busy_pages(bp->b_vp, bp);
409 vn_strategy(vp, &bp->b_bio1);
418 bap = (daddr_t *)bp->b_data;
419 MALLOC(copy, daddr_t *, fs->s_blocksize, M_TEMP, M_WAITOK);
420 bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->s_blocksize);
421 bzero((caddr_t)&bap[last + 1],
422 (u_int)(NINDIR(fs) - (last + 1)) * sizeof (daddr_t));
424 bp->b_flags |= B_INVAL;
431 * Recursively free totally unused blocks.
433 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
434 i--, nlbn += factor) {
438 if (level > SINGLE) {
439 if ((error = ext2_indirtrunc(ip, nlbn,
440 fsbtodoff(fs, nb), (daddr_t)-1, level - 1, &blkcount)) != 0)
442 blocksreleased += blkcount;
444 ext2_blkfree(ip, nb, fs->s_blocksize);
445 blocksreleased += nblocks;
449 * Recursively free last partial block.
451 if (level > SINGLE && lastbn >= 0) {
452 last = lastbn % factor;
455 error = ext2_indirtrunc(ip, nlbn, fsbtodoff(fs, nb),
456 last, level - 1, &blkcount);
459 blocksreleased += blkcount;
463 *countp = blocksreleased;
468 * Last reference to an inode. If necessary, write or delete it.
470 * ext2_inactive(struct vnode *a_vp)
473 ext2_inactive(struct vop_inactive_args *ap)
475 struct vnode *vp = ap->a_vp;
476 struct inode *ip = VTOI(vp);
479 ext2_discard_prealloc(ip);
480 if (prtactive && vp->v_usecount != 1)
481 vprint("ext2_inactive: pushing active", vp);
484 * Ignore inodes related to stale file handles.
486 if (ip == NULL || ip->i_mode == 0)
488 if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
490 if (!ext2_getinoquota(ip))
491 (void)ext2_chkiq(ip, -1, NOCRED, FORCE);
493 error = EXT2_TRUNCATE(vp, (off_t)0, 0, NOCRED);
497 ip->i_flag |= IN_CHANGE | IN_UPDATE;
498 EXT2_VFREE(vp, ip->i_number, mode);
500 if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))
504 * If we are done with the inode, reclaim it
505 * so that it can be reused immediately.
507 if (ip == NULL || ip->i_mode == 0)
513 * Reclaim an inode so that it can be used for other purposes.
515 * ext2_reclaim(struct vnode *a_vp)
518 ext2_reclaim(struct vop_reclaim_args *ap)
521 struct vnode *vp = ap->a_vp;
526 if (prtactive && vp->v_usecount != 1)
527 vprint("ext2_reclaim: pushing active", vp);
534 if (ip->i_flag & IN_LAZYMOD) {
535 ip->i_flag |= IN_MODIFIED;
540 if (ip && (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))) {
541 printf("WARNING: INODE %ld flags %08x: modified inode being released!\n", (long)ip->i_number, (int)ip->i_flag);
542 ip->i_flag |= IN_MODIFIED;
547 * Remove the inode from its hash chain and purge namecache
548 * data associated with the vnode.
558 for (i = 0; i < MAXQUOTAS; i++) {
559 if (ip->i_dquot[i] != NODQUOT) {
560 ext2_dqrele(vp, ip->i_dquot[i]);
561 ip->i_dquot[i] = NODQUOT;
566 if (ip->i_dirhash != NULL)
567 ext2dirhash_free(ip);
569 kfree(ip, VFSTOEXT2(vp->v_mount)->um_malloctype);