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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35 * @(#)ffs_inode.c 8.5 (Berkeley) 12/30/93
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/mount.h>
44 #include <sys/vnode.h>
45 #include <sys/malloc.h>
46 #include <sys/rwlock.h>
49 #include <vm/vm_extern.h>
51 #include <fs/ext2fs/inode.h>
52 #include <fs/ext2fs/ext2_mount.h>
53 #include <fs/ext2fs/ext2fs.h>
54 #include <fs/ext2fs/fs.h>
55 #include <fs/ext2fs/ext2_extern.h>
57 static int ext2_indirtrunc(struct inode *, daddr_t, daddr_t,
58 daddr_t, int, e4fs_daddr_t *);
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 ext2_i2ei(ip, (struct ext2fs_dinode *)((char *)bp->b_data +
93 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)));
94 if (waitfor && !DOINGASYNC(vp))
102 #define SINGLE 0 /* index of single indirect block */
103 #define DOUBLE 1 /* index of double indirect block */
104 #define TRIPLE 2 /* index of triple indirect block */
106 * Truncate the inode oip to at most length size, freeing the
110 ext2_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
113 struct vnode *ovp = vp;
116 int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
117 uint32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
121 int offset, size, level;
122 e4fs_daddr_t count, nblocks, blocksreleased = 0;
123 int error, i, allerror;
129 ASSERT_VOP_LOCKED(vp, "ext2_truncate");
134 if (ovp->v_type == VLNK &&
135 oip->i_size < ovp->v_mount->mnt_maxsymlinklen) {
138 panic("ext2_truncate: partial truncate of symlink");
140 bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
142 oip->i_flag |= IN_CHANGE | IN_UPDATE;
143 return (ext2_update(ovp, 1));
145 if (oip->i_size == length) {
146 oip->i_flag |= IN_CHANGE | IN_UPDATE;
147 return (ext2_update(ovp, 0));
152 * Lengthen the size of the file. We must ensure that the
153 * last byte of the file is allocated. Since the smallest
154 * value of osize is 0, length will be at least 1.
156 if (osize < length) {
157 if (length > oip->i_e2fs->e2fs_maxfilesize)
159 vnode_pager_setsize(ovp, length);
160 offset = blkoff(fs, length - 1);
161 lbn = lblkno(fs, length - 1);
163 error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
165 vnode_pager_setsize(vp, osize);
168 oip->i_size = length;
169 if (bp->b_bufsize == fs->e2fs_bsize)
170 bp->b_flags |= B_CLUSTEROK;
173 else if (DOINGASYNC(ovp))
177 oip->i_flag |= IN_CHANGE | IN_UPDATE;
178 return (ext2_update(ovp, !DOINGASYNC(ovp)));
181 * Shorten the size of the file. If the file is not being
182 * truncated to a block boundry, the contents of the
183 * partial block following the end of the file must be
184 * zero'ed in case it ever become accessible again because
185 * of subsequent file growth.
187 /* I don't understand the comment above */
188 offset = blkoff(fs, length);
190 oip->i_size = length;
192 lbn = lblkno(fs, length);
194 error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
197 oip->i_size = length;
198 size = blksize(fs, oip, lbn);
199 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
201 if (bp->b_bufsize == fs->e2fs_bsize)
202 bp->b_flags |= B_CLUSTEROK;
205 else if (DOINGASYNC(ovp))
211 * Calculate index into inode's block list of
212 * last direct and indirect blocks (if any)
213 * which we want to keep. Lastblock is -1 when
214 * the file is truncated to 0.
216 lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1;
217 lastiblock[SINGLE] = lastblock - NDADDR;
218 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
219 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
220 nblocks = btodb(fs->e2fs_bsize);
222 * Update file and block pointers on disk before we start freeing
223 * blocks. If we crash before free'ing blocks below, the blocks
224 * will be returned to the free list. lastiblock values are also
225 * normalized to -1 for calls to ext2_indirtrunc below.
227 bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof(oldblks));
228 for (level = TRIPLE; level >= SINGLE; level--)
229 if (lastiblock[level] < 0) {
230 oip->i_ib[level] = 0;
231 lastiblock[level] = -1;
233 for (i = NDADDR - 1; i > lastblock; i--)
235 oip->i_flag |= IN_CHANGE | IN_UPDATE;
236 allerror = ext2_update(ovp, !DOINGASYNC(ovp));
239 * Having written the new inode to disk, save its new configuration
240 * and put back the old block pointers long enough to process them.
241 * Note that we save the new block configuration so we can check it
244 bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof(newblks));
245 bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof(oldblks));
247 error = vtruncbuf(ovp, cred, length, (int)fs->e2fs_bsize);
248 if (error && (allerror == 0))
250 vnode_pager_setsize(ovp, length);
253 * Indirect blocks first.
255 indir_lbn[SINGLE] = -NDADDR;
256 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
257 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
258 for (level = TRIPLE; level >= SINGLE; level--) {
259 bn = oip->i_ib[level];
261 error = ext2_indirtrunc(oip, indir_lbn[level],
262 fsbtodb(fs, bn), lastiblock[level], level, &count);
265 blocksreleased += count;
266 if (lastiblock[level] < 0) {
267 oip->i_ib[level] = 0;
268 ext2_blkfree(oip, bn, fs->e2fs_fsize);
269 blocksreleased += nblocks;
272 if (lastiblock[level] >= 0)
277 * All whole direct blocks or frags.
279 for (i = NDADDR - 1; i > lastblock; i--) {
286 bsize = blksize(fs, oip, i);
287 ext2_blkfree(oip, bn, bsize);
288 blocksreleased += btodb(bsize);
294 * Finally, look for a change in size of the
295 * last direct block; release any frags.
297 bn = oip->i_db[lastblock];
299 long oldspace, newspace;
302 * Calculate amount of space we're giving
303 * back as old block size minus new block size.
305 oldspace = blksize(fs, oip, lastblock);
306 oip->i_size = length;
307 newspace = blksize(fs, oip, lastblock);
309 panic("ext2_truncate: newspace");
310 if (oldspace - newspace > 0) {
312 * Block number of space to be free'd is
313 * the old block # plus the number of frags
314 * required for the storage we're keeping.
316 bn += numfrags(fs, newspace);
317 ext2_blkfree(oip, bn, oldspace - newspace);
318 blocksreleased += btodb(oldspace - newspace);
323 for (level = SINGLE; level <= TRIPLE; level++)
324 if (newblks[NDADDR + level] != oip->i_ib[level])
326 for (i = 0; i < NDADDR; i++)
327 if (newblks[i] != oip->i_db[i])
330 if (length == 0 && (bo->bo_dirty.bv_cnt != 0 ||
331 bo->bo_clean.bv_cnt != 0))
334 #endif /* INVARIANTS */
336 * Put back the real size.
338 oip->i_size = length;
339 if (oip->i_blocks >= blocksreleased)
340 oip->i_blocks -= blocksreleased;
343 oip->i_flag |= IN_CHANGE;
344 vnode_pager_setsize(ovp, length);
349 * Release blocks associated with the inode ip and stored in the indirect
350 * block bn. Blocks are free'd in LIFO order up to (but not including)
351 * lastbn. If level is greater than SINGLE, the block is an indirect block
352 * and recursive calls to indirtrunc must be used to cleanse other indirect
355 * NB: triple indirect blocks are untested.
359 ext2_indirtrunc(struct inode *ip, daddr_t lbn, daddr_t dbn,
360 daddr_t lastbn, int level, e4fs_daddr_t *countp)
363 struct m_ext2fs *fs = ip->i_e2fs;
365 e2fs_daddr_t *bap, *copy;
366 int i, nblocks, error = 0, allerror = 0;
367 e2fs_lbn_t nb, nlbn, last;
368 e4fs_daddr_t blkcount, factor, blocksreleased = 0;
371 * Calculate index in current block of last
372 * block to be kept. -1 indicates the entire
373 * block so we need not calculate the index.
376 for (i = SINGLE; i < level; i++)
377 factor *= NINDIR(fs);
381 nblocks = btodb(fs->e2fs_bsize);
383 * Get buffer of block pointers, zero those entries corresponding
384 * to blocks to be free'd, and update on disk copy first. Since
385 * double(triple) indirect before single(double) indirect, calls
386 * to bmap on these blocks will fail. However, we already have
387 * the on disk address, so we have to set the b_blkno field
388 * explicitly instead of letting bread do everything for us.
391 bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0, 0);
392 if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
393 bp->b_iocmd = BIO_READ;
394 if (bp->b_bcount > bp->b_bufsize)
395 panic("ext2_indirtrunc: bad buffer size");
397 vfs_busy_pages(bp, 0);
398 bp->b_iooffset = dbtob(bp->b_blkno);
408 bap = (e2fs_daddr_t *)bp->b_data;
409 copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK);
410 bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->e2fs_bsize);
411 bzero((caddr_t)&bap[last + 1],
412 (NINDIR(fs) - (last + 1)) * sizeof(e2fs_daddr_t));
414 bp->b_flags |= B_INVAL;
415 if (DOINGASYNC(vp)) {
425 * Recursively free totally unused blocks.
427 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
428 i--, nlbn += factor) {
432 if (level > SINGLE) {
433 if ((error = ext2_indirtrunc(ip, nlbn,
434 fsbtodb(fs, nb), (int32_t)-1, level - 1, &blkcount)) != 0)
436 blocksreleased += blkcount;
438 ext2_blkfree(ip, nb, fs->e2fs_bsize);
439 blocksreleased += nblocks;
443 * Recursively free last partial block.
445 if (level > SINGLE && lastbn >= 0) {
446 last = lastbn % factor;
449 if ((error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
450 last, level - 1, &blkcount)) != 0)
452 blocksreleased += blkcount;
456 *countp = blocksreleased;
461 * discard preallocated blocks
464 ext2_inactive(struct vop_inactive_args *ap)
466 struct vnode *vp = ap->a_vp;
467 struct inode *ip = VTOI(vp);
468 struct thread *td = ap->a_td;
472 * Ignore inodes related to stale file handles.
476 if (ip->i_nlink <= 0) {
477 error = ext2_truncate(vp, (off_t)0, 0, NOCRED, td);
481 ip->i_flag |= IN_CHANGE | IN_UPDATE;
482 ext2_vfree(vp, ip->i_number, mode);
484 if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))
488 * If we are done with the inode, reclaim it
489 * so that it can be reused immediately.
497 * Reclaim an inode so that it can be used for other purposes.
500 ext2_reclaim(struct vop_reclaim_args *ap)
503 struct vnode *vp = ap->a_vp;
506 if (ip->i_flag & IN_LAZYMOD) {
507 ip->i_flag |= IN_MODIFIED;
511 free(vp->v_data, M_EXT2NODE);
513 vnode_destroy_vobject(vp);