2 * modified for Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
8 * SPDX-License-Identifier: BSD-3-Clause
10 * Copyright (c) 1982, 1986, 1989, 1993
11 * The Regents of the University of California. All rights reserved.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)ffs_inode.c 8.5 (Berkeley) 12/30/93
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/mount.h>
46 #include <sys/vnode.h>
47 #include <sys/malloc.h>
48 #include <sys/rwlock.h>
51 #include <vm/vm_extern.h>
53 #include <fs/ext2fs/inode.h>
54 #include <fs/ext2fs/ext2_mount.h>
55 #include <fs/ext2fs/ext2fs.h>
56 #include <fs/ext2fs/fs.h>
57 #include <fs/ext2fs/ext2_extern.h>
58 #include <fs/ext2fs/ext2_extattr.h>
61 * Update the access, modified, and inode change times as specified by the
62 * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
63 * to disk if the IN_MODIFIED flag is set (it may be set initially, or by
64 * the timestamp update). The IN_LAZYMOD flag is set to force a write
65 * later if not now. If we write now, then clear both IN_MODIFIED and
66 * IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
67 * set, then wait for the write to complete.
70 ext2_update(struct vnode *vp, int waitfor)
77 ASSERT_VOP_ELOCKED(vp, "ext2_update");
80 if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
82 ip->i_flag &= ~(IN_LAZYACCESS | IN_LAZYMOD | IN_MODIFIED);
86 if ((error = bread(ip->i_devvp,
87 fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
88 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
92 error = ext2_i2ei(ip, (struct ext2fs_dinode *)((char *)bp->b_data +
93 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)));
98 if (waitfor && !DOINGASYNC(vp))
106 #define SINGLE 0 /* index of single indirect block */
107 #define DOUBLE 1 /* index of double indirect block */
108 #define TRIPLE 2 /* index of triple indirect block */
111 * Release blocks associated with the inode ip and stored in the indirect
112 * block bn. Blocks are free'd in LIFO order up to (but not including)
113 * lastbn. If level is greater than SINGLE, the block is an indirect block
114 * and recursive calls to indirtrunc must be used to cleanse other indirect
117 * NB: triple indirect blocks are untested.
120 ext2_indirtrunc(struct inode *ip, daddr_t lbn, daddr_t dbn,
121 daddr_t lastbn, int level, e4fs_daddr_t *countp)
124 struct m_ext2fs *fs = ip->i_e2fs;
126 e2fs_daddr_t *bap, *copy;
127 int i, nblocks, error = 0, allerror = 0;
128 e2fs_lbn_t nb, nlbn, last;
129 e4fs_daddr_t blkcount, factor, blocksreleased = 0;
132 * Calculate index in current block of last
133 * block to be kept. -1 indicates the entire
134 * block so we need not calculate the index.
137 for (i = SINGLE; i < level; i++)
138 factor *= NINDIR(fs);
142 nblocks = btodb(fs->e2fs_bsize);
144 * Get buffer of block pointers, zero those entries corresponding
145 * to blocks to be free'd, and update on disk copy first. Since
146 * double(triple) indirect before single(double) indirect, calls
147 * to bmap on these blocks will fail. However, we already have
148 * the on disk address, so we have to set the b_blkno field
149 * explicitly instead of letting bread do everything for us.
152 bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0, 0);
153 if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
154 bp->b_iocmd = BIO_READ;
155 if (bp->b_bcount > bp->b_bufsize)
156 panic("ext2_indirtrunc: bad buffer size");
158 vfs_busy_pages(bp, 0);
159 bp->b_iooffset = dbtob(bp->b_blkno);
168 bap = (e2fs_daddr_t *)bp->b_data;
169 copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK);
170 bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->e2fs_bsize);
171 bzero((caddr_t)&bap[last + 1],
172 (NINDIR(fs) - (last + 1)) * sizeof(e2fs_daddr_t));
174 bp->b_flags |= B_INVAL;
175 if (DOINGASYNC(vp)) {
185 * Recursively free totally unused blocks.
187 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
188 i--, nlbn += factor) {
192 if (level > SINGLE) {
193 if ((error = ext2_indirtrunc(ip, nlbn,
194 fsbtodb(fs, nb), (int32_t)-1, level - 1, &blkcount)) != 0)
196 blocksreleased += blkcount;
198 ext2_blkfree(ip, nb, fs->e2fs_bsize);
199 blocksreleased += nblocks;
203 * Recursively free last partial block.
205 if (level > SINGLE && lastbn >= 0) {
206 last = lastbn % factor;
209 if ((error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
210 last, level - 1, &blkcount)) != 0)
212 blocksreleased += blkcount;
216 *countp = blocksreleased;
221 * Truncate the inode oip to at most length size, freeing the
225 ext2_ind_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
228 struct vnode *ovp = vp;
229 e4fs_daddr_t lastblock;
231 e4fs_daddr_t bn, lbn, lastiblock[EXT2_NIADDR], indir_lbn[EXT2_NIADDR];
232 uint32_t oldblks[EXT2_NDADDR + EXT2_NIADDR];
233 uint32_t newblks[EXT2_NDADDR + EXT2_NIADDR];
236 int offset, size, level;
237 e4fs_daddr_t count, nblocks, blocksreleased = 0;
238 int error, i, allerror;
252 * Lengthen the size of the file. We must ensure that the
253 * last byte of the file is allocated. Since the smallest
254 * value of osize is 0, length will be at least 1.
256 if (osize < length) {
257 if (length > oip->i_e2fs->e2fs_maxfilesize)
259 vnode_pager_setsize(ovp, length);
260 offset = blkoff(fs, length - 1);
261 lbn = lblkno(fs, length - 1);
263 error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
265 vnode_pager_setsize(vp, osize);
268 oip->i_size = length;
269 if (bp->b_bufsize == fs->e2fs_bsize)
270 bp->b_flags |= B_CLUSTEROK;
273 else if (DOINGASYNC(ovp))
277 oip->i_flag |= IN_CHANGE | IN_UPDATE;
278 return (ext2_update(ovp, !DOINGASYNC(ovp)));
281 * Shorten the size of the file. If the file is not being
282 * truncated to a block boundary, the contents of the
283 * partial block following the end of the file must be
284 * zero'ed in case it ever become accessible again because
285 * of subsequent file growth.
287 /* I don't understand the comment above */
288 offset = blkoff(fs, length);
290 oip->i_size = length;
292 lbn = lblkno(fs, length);
294 error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
297 oip->i_size = length;
298 size = blksize(fs, oip, lbn);
299 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
301 if (bp->b_bufsize == fs->e2fs_bsize)
302 bp->b_flags |= B_CLUSTEROK;
305 else if (DOINGASYNC(ovp))
311 * Calculate index into inode's block list of
312 * last direct and indirect blocks (if any)
313 * which we want to keep. Lastblock is -1 when
314 * the file is truncated to 0.
316 lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1;
317 lastiblock[SINGLE] = lastblock - EXT2_NDADDR;
318 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
319 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
320 nblocks = btodb(fs->e2fs_bsize);
322 * Update file and block pointers on disk before we start freeing
323 * blocks. If we crash before free'ing blocks below, the blocks
324 * will be returned to the free list. lastiblock values are also
325 * normalized to -1 for calls to ext2_indirtrunc below.
327 for (level = TRIPLE; level >= SINGLE; level--) {
328 oldblks[EXT2_NDADDR + level] = oip->i_ib[level];
329 if (lastiblock[level] < 0) {
330 oip->i_ib[level] = 0;
331 lastiblock[level] = -1;
334 for (i = 0; i < EXT2_NDADDR; i++) {
335 oldblks[i] = oip->i_db[i];
339 oip->i_flag |= IN_CHANGE | IN_UPDATE;
340 allerror = ext2_update(ovp, !DOINGASYNC(ovp));
343 * Having written the new inode to disk, save its new configuration
344 * and put back the old block pointers long enough to process them.
345 * Note that we save the new block configuration so we can check it
348 for (i = 0; i < EXT2_NDADDR; i++) {
349 newblks[i] = oip->i_db[i];
350 oip->i_db[i] = oldblks[i];
352 for (i = 0; i < EXT2_NIADDR; i++) {
353 newblks[EXT2_NDADDR + i] = oip->i_ib[i];
354 oip->i_ib[i] = oldblks[EXT2_NDADDR + i];
357 error = vtruncbuf(ovp, cred, length, (int)fs->e2fs_bsize);
358 if (error && (allerror == 0))
360 vnode_pager_setsize(ovp, length);
363 * Indirect blocks first.
365 indir_lbn[SINGLE] = -EXT2_NDADDR;
366 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
367 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
368 for (level = TRIPLE; level >= SINGLE; level--) {
369 bn = oip->i_ib[level];
371 error = ext2_indirtrunc(oip, indir_lbn[level],
372 fsbtodb(fs, bn), lastiblock[level], level, &count);
375 blocksreleased += count;
376 if (lastiblock[level] < 0) {
377 oip->i_ib[level] = 0;
378 ext2_blkfree(oip, bn, fs->e2fs_fsize);
379 blocksreleased += nblocks;
382 if (lastiblock[level] >= 0)
387 * All whole direct blocks or frags.
389 for (i = EXT2_NDADDR - 1; i > lastblock; i--) {
396 bsize = blksize(fs, oip, i);
397 ext2_blkfree(oip, bn, bsize);
398 blocksreleased += btodb(bsize);
404 * Finally, look for a change in size of the
405 * last direct block; release any frags.
407 bn = oip->i_db[lastblock];
409 long oldspace, newspace;
412 * Calculate amount of space we're giving
413 * back as old block size minus new block size.
415 oldspace = blksize(fs, oip, lastblock);
416 oip->i_size = length;
417 newspace = blksize(fs, oip, lastblock);
419 panic("ext2_truncate: newspace");
420 if (oldspace - newspace > 0) {
422 * Block number of space to be free'd is
423 * the old block # plus the number of frags
424 * required for the storage we're keeping.
426 bn += numfrags(fs, newspace);
427 ext2_blkfree(oip, bn, oldspace - newspace);
428 blocksreleased += btodb(oldspace - newspace);
433 for (level = SINGLE; level <= TRIPLE; level++)
434 if (newblks[EXT2_NDADDR + level] != oip->i_ib[level])
436 for (i = 0; i < EXT2_NDADDR; i++)
437 if (newblks[i] != oip->i_db[i])
440 if (length == 0 && (bo->bo_dirty.bv_cnt != 0 ||
441 bo->bo_clean.bv_cnt != 0))
444 #endif /* INVARIANTS */
446 * Put back the real size.
448 oip->i_size = length;
449 if (oip->i_blocks >= blocksreleased)
450 oip->i_blocks -= blocksreleased;
453 oip->i_flag |= IN_CHANGE;
454 vnode_pager_setsize(ovp, length);
459 ext2_ext_truncate(struct vnode *vp, off_t length, int flags,
460 struct ucred *cred, struct thread *td)
462 struct vnode *ovp = vp;
467 uint32_t lbn, offset;
475 if (osize < length) {
476 if (length > oip->i_e2fs->e2fs_maxfilesize) {
479 vnode_pager_setsize(ovp, length);
480 offset = blkoff(fs, length - 1);
481 lbn = lblkno(fs, length - 1);
483 error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
485 vnode_pager_setsize(vp, osize);
488 oip->i_size = length;
489 if (bp->b_bufsize == fs->e2fs_bsize)
490 bp->b_flags |= B_CLUSTEROK;
493 else if (DOINGASYNC(ovp))
497 oip->i_flag |= IN_CHANGE | IN_UPDATE;
498 return (ext2_update(ovp, !DOINGASYNC(ovp)));
501 lastblock = (length + fs->e2fs_bsize - 1) / fs->e2fs_bsize;
502 error = ext4_ext_remove_space(oip, lastblock, flags, cred, td);
506 offset = blkoff(fs, length);
508 oip->i_size = length;
510 lbn = lblkno(fs, length);
512 error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
516 oip->i_size = length;
517 size = blksize(fs, oip, lbn);
518 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
520 if (bp->b_bufsize == fs->e2fs_bsize)
521 bp->b_flags |= B_CLUSTEROK;
524 else if (DOINGASYNC(ovp))
531 error = vtruncbuf(ovp, cred, length, (int)fs->e2fs_bsize);
535 vnode_pager_setsize(ovp, length);
537 oip->i_size = length;
538 oip->i_flag |= IN_CHANGE | IN_UPDATE;
539 error = ext2_update(ovp, !DOINGASYNC(ovp));
545 * Truncate the inode ip to at most length size, freeing the
549 ext2_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
555 ASSERT_VOP_LOCKED(vp, "ext2_truncate");
561 if (vp->v_type == VLNK &&
562 ip->i_size < vp->v_mount->mnt_maxsymlinklen) {
565 panic("ext2_truncate: partial truncate of symlink");
567 bzero((char *)&ip->i_shortlink, (u_int)ip->i_size);
569 ip->i_flag |= IN_CHANGE | IN_UPDATE;
570 return (ext2_update(vp, 1));
572 if (ip->i_size == length) {
573 ip->i_flag |= IN_CHANGE | IN_UPDATE;
574 return (ext2_update(vp, 0));
577 if (ip->i_flag & IN_E4EXTENTS)
578 error = ext2_ext_truncate(vp, length, flags, cred, td);
580 error = ext2_ind_truncate(vp, length, flags, cred, td);
586 * discard preallocated blocks
589 ext2_inactive(struct vop_inactive_args *ap)
591 struct vnode *vp = ap->a_vp;
592 struct inode *ip = VTOI(vp);
593 struct thread *td = ap->a_td;
597 * Ignore inodes related to stale file handles.
601 if (ip->i_nlink <= 0) {
602 ext2_extattr_free(ip);
603 error = ext2_truncate(vp, (off_t)0, 0, NOCRED, td);
604 if (!(ip->i_flag & IN_E4EXTENTS))
608 ip->i_flag |= IN_CHANGE | IN_UPDATE;
609 ext2_vfree(vp, ip->i_number, mode);
611 if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))
615 * If we are done with the inode, reclaim it
616 * so that it can be reused immediately.
624 * Reclaim an inode so that it can be used for other purposes.
627 ext2_reclaim(struct vop_reclaim_args *ap)
630 struct vnode *vp = ap->a_vp;
633 if (ip->i_flag & IN_LAZYMOD) {
634 ip->i_flag |= IN_MODIFIED;
638 free(vp->v_data, M_EXT2NODE);
640 vnode_destroy_vobject(vp);