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)
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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/fs.h>
54 #include <fs/ext2fs/inode.h>
55 #include <fs/ext2fs/ext2_mount.h>
56 #include <fs/ext2fs/ext2fs.h>
57 #include <fs/ext2fs/fs.h>
58 #include <fs/ext2fs/ext2_extern.h>
59 #include <fs/ext2fs/ext2_extattr.h>
62 * Update the access, modified, and inode change times as specified by the
63 * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
64 * to disk if the IN_MODIFIED flag is set (it may be set initially, or by
65 * the timestamp update). The IN_LAZYMOD flag is set to force a write
66 * later if not now. If we write now, then clear both IN_MODIFIED and
67 * IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
68 * set, then wait for the write to complete.
71 ext2_update(struct vnode *vp, int waitfor)
78 ASSERT_VOP_ELOCKED(vp, "ext2_update");
81 if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
83 ip->i_flag &= ~(IN_LAZYACCESS | IN_LAZYMOD | IN_MODIFIED);
87 if ((error = bread(ip->i_devvp,
88 fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
89 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
93 error = ext2_i2ei(ip, (struct ext2fs_dinode *)((char *)bp->b_data +
94 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)));
99 if (waitfor && !DOINGASYNC(vp))
107 #define SINGLE 0 /* index of single indirect block */
108 #define DOUBLE 1 /* index of double indirect block */
109 #define TRIPLE 2 /* index of triple indirect block */
112 * Release blocks associated with the inode ip and stored in the indirect
113 * block bn. Blocks are free'd in LIFO order up to (but not including)
114 * lastbn. If level is greater than SINGLE, the block is an indirect block
115 * and recursive calls to indirtrunc must be used to cleanse other indirect
118 * NB: triple indirect blocks are untested.
121 ext2_indirtrunc(struct inode *ip, daddr_t lbn, daddr_t dbn,
122 daddr_t lastbn, int level, e4fs_daddr_t *countp)
125 struct m_ext2fs *fs = ip->i_e2fs;
127 e2fs_daddr_t *bap, *copy;
128 int i, nblocks, error = 0, allerror = 0;
129 e2fs_lbn_t nb, nlbn, last;
130 e4fs_daddr_t blkcount, factor, blocksreleased = 0;
133 * Calculate index in current block of last
134 * block to be kept. -1 indicates the entire
135 * block so we need not calculate the index.
138 for (i = SINGLE; i < level; i++)
139 factor *= NINDIR(fs);
143 nblocks = btodb(fs->e2fs_bsize);
145 * Get buffer of block pointers, zero those entries corresponding
146 * to blocks to be free'd, and update on disk copy first. Since
147 * double(triple) indirect before single(double) indirect, calls
148 * to bmap on these blocks will fail. However, we already have
149 * the on disk address, so we have to set the b_blkno field
150 * explicitly instead of letting bread do everything for us.
153 bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0, 0);
154 if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
155 bp->b_iocmd = BIO_READ;
156 if (bp->b_bcount > bp->b_bufsize)
157 panic("ext2_indirtrunc: bad buffer size");
159 vfs_busy_pages(bp, 0);
160 bp->b_iooffset = dbtob(bp->b_blkno);
169 bap = (e2fs_daddr_t *)bp->b_data;
170 copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK);
171 bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->e2fs_bsize);
172 bzero((caddr_t)&bap[last + 1],
173 (NINDIR(fs) - (last + 1)) * sizeof(e2fs_daddr_t));
175 bp->b_flags |= B_INVAL;
176 if (DOINGASYNC(vp)) {
186 * Recursively free totally unused blocks.
188 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
189 i--, nlbn += factor) {
193 if (level > SINGLE) {
194 if ((error = ext2_indirtrunc(ip, nlbn,
195 fsbtodb(fs, nb), (int32_t)-1, level - 1, &blkcount)) != 0)
197 blocksreleased += blkcount;
199 ext2_blkfree(ip, nb, fs->e2fs_bsize);
200 blocksreleased += nblocks;
204 * Recursively free last partial block.
206 if (level > SINGLE && lastbn >= 0) {
207 last = lastbn % factor;
210 if ((error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
211 last, level - 1, &blkcount)) != 0)
213 blocksreleased += blkcount;
217 *countp = blocksreleased;
222 * Truncate the inode oip to at most length size, freeing the
226 ext2_ind_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
229 struct vnode *ovp = vp;
230 e4fs_daddr_t lastblock;
232 e4fs_daddr_t bn, lbn, lastiblock[EXT2_NIADDR], indir_lbn[EXT2_NIADDR];
233 uint32_t oldblks[EXT2_NDADDR + EXT2_NIADDR];
234 uint32_t newblks[EXT2_NDADDR + EXT2_NIADDR];
237 int offset, size, level;
238 e4fs_daddr_t count, nblocks, blocksreleased = 0;
239 int error, i, allerror;
253 * Lengthen the size of the file. We must ensure that the
254 * last byte of the file is allocated. Since the smallest
255 * value of osize is 0, length will be at least 1.
257 if (osize < length) {
258 if (length > oip->i_e2fs->e2fs_maxfilesize)
260 vnode_pager_setsize(ovp, length);
261 offset = blkoff(fs, length - 1);
262 lbn = lblkno(fs, length - 1);
264 error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
266 vnode_pager_setsize(vp, osize);
269 oip->i_size = length;
270 if (bp->b_bufsize == fs->e2fs_bsize)
271 bp->b_flags |= B_CLUSTEROK;
274 else if (DOINGASYNC(ovp))
278 oip->i_flag |= IN_CHANGE | IN_UPDATE;
279 return (ext2_update(ovp, !DOINGASYNC(ovp)));
282 * Shorten the size of the file. If the file is not being
283 * truncated to a block boundary, the contents of the
284 * partial block following the end of the file must be
285 * zero'ed in case it ever become accessible again because
286 * of subsequent file growth.
288 /* I don't understand the comment above */
289 offset = blkoff(fs, length);
291 oip->i_size = length;
293 lbn = lblkno(fs, length);
295 error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
298 oip->i_size = length;
299 size = blksize(fs, oip, lbn);
300 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
302 if (bp->b_bufsize == fs->e2fs_bsize)
303 bp->b_flags |= B_CLUSTEROK;
306 else if (DOINGASYNC(ovp))
312 * Calculate index into inode's block list of
313 * last direct and indirect blocks (if any)
314 * which we want to keep. Lastblock is -1 when
315 * the file is truncated to 0.
317 lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1;
318 lastiblock[SINGLE] = lastblock - EXT2_NDADDR;
319 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
320 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
321 nblocks = btodb(fs->e2fs_bsize);
323 * Update file and block pointers on disk before we start freeing
324 * blocks. If we crash before free'ing blocks below, the blocks
325 * will be returned to the free list. lastiblock values are also
326 * normalized to -1 for calls to ext2_indirtrunc below.
328 for (level = TRIPLE; level >= SINGLE; level--) {
329 oldblks[EXT2_NDADDR + level] = oip->i_ib[level];
330 if (lastiblock[level] < 0) {
331 oip->i_ib[level] = 0;
332 lastiblock[level] = -1;
335 for (i = 0; i < EXT2_NDADDR; i++) {
336 oldblks[i] = oip->i_db[i];
340 oip->i_flag |= IN_CHANGE | IN_UPDATE;
341 allerror = ext2_update(ovp, !DOINGASYNC(ovp));
344 * Having written the new inode to disk, save its new configuration
345 * and put back the old block pointers long enough to process them.
346 * Note that we save the new block configuration so we can check it
349 for (i = 0; i < EXT2_NDADDR; i++) {
350 newblks[i] = oip->i_db[i];
351 oip->i_db[i] = oldblks[i];
353 for (i = 0; i < EXT2_NIADDR; i++) {
354 newblks[EXT2_NDADDR + i] = oip->i_ib[i];
355 oip->i_ib[i] = oldblks[EXT2_NDADDR + i];
358 error = vtruncbuf(ovp, cred, length, (int)fs->e2fs_bsize);
359 if (error && (allerror == 0))
361 vnode_pager_setsize(ovp, length);
364 * Indirect blocks first.
366 indir_lbn[SINGLE] = -EXT2_NDADDR;
367 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
368 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
369 for (level = TRIPLE; level >= SINGLE; level--) {
370 bn = oip->i_ib[level];
372 error = ext2_indirtrunc(oip, indir_lbn[level],
373 fsbtodb(fs, bn), lastiblock[level], level, &count);
376 blocksreleased += count;
377 if (lastiblock[level] < 0) {
378 oip->i_ib[level] = 0;
379 ext2_blkfree(oip, bn, fs->e2fs_fsize);
380 blocksreleased += nblocks;
383 if (lastiblock[level] >= 0)
388 * All whole direct blocks or frags.
390 for (i = EXT2_NDADDR - 1; i > lastblock; i--) {
397 bsize = blksize(fs, oip, i);
398 ext2_blkfree(oip, bn, bsize);
399 blocksreleased += btodb(bsize);
405 * Finally, look for a change in size of the
406 * last direct block; release any frags.
408 bn = oip->i_db[lastblock];
410 long oldspace, newspace;
413 * Calculate amount of space we're giving
414 * back as old block size minus new block size.
416 oldspace = blksize(fs, oip, lastblock);
417 oip->i_size = length;
418 newspace = blksize(fs, oip, lastblock);
420 panic("ext2_truncate: newspace");
421 if (oldspace - newspace > 0) {
423 * Block number of space to be free'd is
424 * the old block # plus the number of frags
425 * required for the storage we're keeping.
427 bn += numfrags(fs, newspace);
428 ext2_blkfree(oip, bn, oldspace - newspace);
429 blocksreleased += btodb(oldspace - newspace);
434 for (level = SINGLE; level <= TRIPLE; level++)
435 if (newblks[EXT2_NDADDR + level] != oip->i_ib[level])
437 for (i = 0; i < EXT2_NDADDR; i++)
438 if (newblks[i] != oip->i_db[i])
441 if (length == 0 && (bo->bo_dirty.bv_cnt != 0 ||
442 bo->bo_clean.bv_cnt != 0))
445 #endif /* INVARIANTS */
447 * Put back the real size.
449 oip->i_size = length;
450 if (oip->i_blocks >= blocksreleased)
451 oip->i_blocks -= blocksreleased;
454 oip->i_flag |= IN_CHANGE;
455 vnode_pager_setsize(ovp, length);
460 ext2_ext_truncate(struct vnode *vp, off_t length, int flags,
461 struct ucred *cred, struct thread *td)
463 struct vnode *ovp = vp;
468 uint32_t lbn, offset;
476 if (osize < length) {
477 if (length > oip->i_e2fs->e2fs_maxfilesize) {
480 vnode_pager_setsize(ovp, length);
481 offset = blkoff(fs, length - 1);
482 lbn = lblkno(fs, length - 1);
484 error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
486 vnode_pager_setsize(vp, osize);
489 oip->i_size = length;
490 if (bp->b_bufsize == fs->e2fs_bsize)
491 bp->b_flags |= B_CLUSTEROK;
494 else if (DOINGASYNC(ovp))
498 oip->i_flag |= IN_CHANGE | IN_UPDATE;
499 return (ext2_update(ovp, !DOINGASYNC(ovp)));
502 lastblock = (length + fs->e2fs_bsize - 1) / fs->e2fs_bsize;
503 error = ext4_ext_remove_space(oip, lastblock, flags, cred, td);
507 offset = blkoff(fs, length);
509 oip->i_size = length;
511 lbn = lblkno(fs, length);
513 error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
517 oip->i_size = length;
518 size = blksize(fs, oip, lbn);
519 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
521 if (bp->b_bufsize == fs->e2fs_bsize)
522 bp->b_flags |= B_CLUSTEROK;
525 else if (DOINGASYNC(ovp))
532 error = vtruncbuf(ovp, cred, length, (int)fs->e2fs_bsize);
536 vnode_pager_setsize(ovp, length);
538 oip->i_size = length;
539 oip->i_flag |= IN_CHANGE | IN_UPDATE;
540 error = ext2_update(ovp, !DOINGASYNC(ovp));
546 * Truncate the inode ip to at most length size, freeing the
550 ext2_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
556 ASSERT_VOP_LOCKED(vp, "ext2_truncate");
562 if (vp->v_type == VLNK &&
563 ip->i_size < vp->v_mount->mnt_maxsymlinklen) {
566 panic("ext2_truncate: partial truncate of symlink");
568 bzero((char *)&ip->i_shortlink, (u_int)ip->i_size);
570 ip->i_flag |= IN_CHANGE | IN_UPDATE;
571 return (ext2_update(vp, 1));
573 if (ip->i_size == length) {
574 ip->i_flag |= IN_CHANGE | IN_UPDATE;
575 return (ext2_update(vp, 0));
578 if (ip->i_flag & IN_E4EXTENTS)
579 error = ext2_ext_truncate(vp, length, flags, cred, td);
581 error = ext2_ind_truncate(vp, length, flags, cred, td);
587 * discard preallocated blocks
590 ext2_inactive(struct vop_inactive_args *ap)
592 struct vnode *vp = ap->a_vp;
593 struct inode *ip = VTOI(vp);
594 struct thread *td = ap->a_td;
598 * Ignore inodes related to stale file handles.
602 if (ip->i_nlink <= 0) {
603 ext2_extattr_free(ip);
604 error = ext2_truncate(vp, (off_t)0, 0, NOCRED, td);
605 if (!(ip->i_flag & IN_E4EXTENTS))
609 ip->i_flag |= IN_CHANGE | IN_UPDATE;
610 ext2_vfree(vp, ip->i_number, mode);
612 if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))
616 * If we are done with the inode, reclaim it
617 * so that it can be reused immediately.
625 * Reclaim an inode so that it can be used for other purposes.
628 ext2_reclaim(struct vop_reclaim_args *ap)
631 struct vnode *vp = ap->a_vp;
634 if (ip->i_flag & IN_LAZYMOD) {
635 ip->i_flag |= IN_MODIFIED;
639 free(vp->v_data, M_EXT2NODE);
641 vnode_destroy_vobject(vp);