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>
48 #include <vm/vm_extern.h>
50 #include <fs/ext2fs/inode.h>
51 #include <fs/ext2fs/ext2_mount.h>
52 #include <fs/ext2fs/ext2fs.h>
53 #include <fs/ext2fs/fs.h>
54 #include <fs/ext2fs/ext2_extern.h>
56 static int ext2_indirtrunc(struct inode *, int32_t, int32_t, int32_t, int,
60 * Update the access, modified, and inode change times as specified by the
61 * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
62 * to disk if the IN_MODIFIED flag is set (it may be set initially, or by
63 * the timestamp update). The IN_LAZYMOD flag is set to force a write
64 * later if not now. If we write now, then clear both IN_MODIFIED and
65 * IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
66 * set, then wait for the write to complete.
69 ext2_update(struct vnode *vp, int waitfor)
76 ASSERT_VOP_ELOCKED(vp, "ext2_update");
79 if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
81 ip->i_flag &= ~(IN_LAZYACCESS | IN_LAZYMOD | IN_MODIFIED);
85 if ((error = bread(ip->i_devvp,
86 fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
87 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
91 ext2_i2ei(ip, (struct ext2fs_dinode *)((char *)bp->b_data +
92 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)));
93 if (waitfor && !DOINGASYNC(vp))
101 #define SINGLE 0 /* index of single indirect block */
102 #define DOUBLE 1 /* index of double indirect block */
103 #define TRIPLE 2 /* index of triple indirect block */
105 * Truncate the inode oip to at most length size, freeing the
109 ext2_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
112 struct vnode *ovp = vp;
115 int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
116 uint32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
120 int offset, size, level;
121 long count, nblocks, blocksreleased = 0;
122 int error, i, allerror;
128 ASSERT_VOP_LOCKED(vp, "ext2_truncate");
133 if (ovp->v_type == VLNK &&
134 oip->i_size < ovp->v_mount->mnt_maxsymlinklen) {
137 panic("ext2_truncate: partial truncate of symlink");
139 bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
141 oip->i_flag |= IN_CHANGE | IN_UPDATE;
142 return (ext2_update(ovp, 1));
144 if (oip->i_size == length) {
145 oip->i_flag |= IN_CHANGE | IN_UPDATE;
146 return (ext2_update(ovp, 0));
151 * Lengthen the size of the file. We must ensure that the
152 * last byte of the file is allocated. Since the smallest
153 * value of osize is 0, length will be at least 1.
155 if (osize < length) {
156 if (length > oip->i_e2fs->e2fs_maxfilesize)
158 vnode_pager_setsize(ovp, length);
159 offset = blkoff(fs, length - 1);
160 lbn = lblkno(fs, length - 1);
162 error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
164 vnode_pager_setsize(vp, osize);
167 oip->i_size = length;
168 if (bp->b_bufsize == fs->e2fs_bsize)
169 bp->b_flags |= B_CLUSTEROK;
172 else if (DOINGASYNC(ovp))
176 oip->i_flag |= IN_CHANGE | IN_UPDATE;
177 return (ext2_update(ovp, !DOINGASYNC(ovp)));
180 * Shorten the size of the file. If the file is not being
181 * truncated to a block boundry, the contents of the
182 * partial block following the end of the file must be
183 * zero'ed in case it ever become accessible again because
184 * of subsequent file growth.
186 /* I don't understand the comment above */
187 offset = blkoff(fs, length);
189 oip->i_size = length;
191 lbn = lblkno(fs, length);
193 error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
196 oip->i_size = length;
197 size = blksize(fs, oip, lbn);
198 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
200 if (bp->b_bufsize == fs->e2fs_bsize)
201 bp->b_flags |= B_CLUSTEROK;
204 else if (DOINGASYNC(ovp))
210 * Calculate index into inode's block list of
211 * last direct and indirect blocks (if any)
212 * which we want to keep. Lastblock is -1 when
213 * the file is truncated to 0.
215 lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1;
216 lastiblock[SINGLE] = lastblock - NDADDR;
217 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
218 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
219 nblocks = btodb(fs->e2fs_bsize);
221 * Update file and block pointers on disk before we start freeing
222 * blocks. If we crash before free'ing blocks below, the blocks
223 * will be returned to the free list. lastiblock values are also
224 * normalized to -1 for calls to ext2_indirtrunc below.
226 bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof(oldblks));
227 for (level = TRIPLE; level >= SINGLE; level--)
228 if (lastiblock[level] < 0) {
229 oip->i_ib[level] = 0;
230 lastiblock[level] = -1;
232 for (i = NDADDR - 1; i > lastblock; i--)
234 oip->i_flag |= IN_CHANGE | IN_UPDATE;
235 allerror = ext2_update(ovp, !DOINGASYNC(ovp));
238 * Having written the new inode to disk, save its new configuration
239 * and put back the old block pointers long enough to process them.
240 * Note that we save the new block configuration so we can check it
243 bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof(newblks));
244 bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof(oldblks));
246 error = vtruncbuf(ovp, cred, td, length, (int)fs->e2fs_bsize);
247 if (error && (allerror == 0))
249 vnode_pager_setsize(ovp, length);
252 * Indirect blocks first.
254 indir_lbn[SINGLE] = -NDADDR;
255 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
256 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
257 for (level = TRIPLE; level >= SINGLE; level--) {
258 bn = oip->i_ib[level];
260 error = ext2_indirtrunc(oip, indir_lbn[level],
261 fsbtodb(fs, bn), lastiblock[level], level, &count);
264 blocksreleased += count;
265 if (lastiblock[level] < 0) {
266 oip->i_ib[level] = 0;
267 ext2_blkfree(oip, bn, fs->e2fs_fsize);
268 blocksreleased += nblocks;
271 if (lastiblock[level] >= 0)
276 * All whole direct blocks or frags.
278 for (i = NDADDR - 1; i > lastblock; i--) {
285 bsize = blksize(fs, oip, i);
286 ext2_blkfree(oip, bn, bsize);
287 blocksreleased += btodb(bsize);
293 * Finally, look for a change in size of the
294 * last direct block; release any frags.
296 bn = oip->i_db[lastblock];
298 long oldspace, newspace;
301 * Calculate amount of space we're giving
302 * back as old block size minus new block size.
304 oldspace = blksize(fs, oip, lastblock);
305 oip->i_size = length;
306 newspace = blksize(fs, oip, lastblock);
308 panic("ext2_truncate: newspace");
309 if (oldspace - newspace > 0) {
311 * Block number of space to be free'd is
312 * the old block # plus the number of frags
313 * required for the storage we're keeping.
315 bn += numfrags(fs, newspace);
316 ext2_blkfree(oip, bn, oldspace - newspace);
317 blocksreleased += btodb(oldspace - newspace);
322 for (level = SINGLE; level <= TRIPLE; level++)
323 if (newblks[NDADDR + level] != oip->i_ib[level])
325 for (i = 0; i < NDADDR; i++)
326 if (newblks[i] != oip->i_db[i])
329 if (length == 0 && (bo->bo_dirty.bv_cnt != 0 ||
330 bo->bo_clean.bv_cnt != 0))
333 #endif /* INVARIANTS */
335 * Put back the real size.
337 oip->i_size = length;
338 if (oip->i_blocks >= blocksreleased)
339 oip->i_blocks -= blocksreleased;
342 oip->i_flag |= IN_CHANGE;
343 vnode_pager_setsize(ovp, length);
348 * Release blocks associated with the inode ip and stored in the indirect
349 * block bn. Blocks are free'd in LIFO order up to (but not including)
350 * lastbn. If level is greater than SINGLE, the block is an indirect block
351 * and recursive calls to indirtrunc must be used to cleanse other indirect
354 * NB: triple indirect blocks are untested.
358 ext2_indirtrunc(struct inode *ip, int32_t lbn, int32_t dbn, int32_t lastbn,
359 int level, long *countp)
362 struct m_ext2fs *fs = ip->i_e2fs;
364 int32_t *bap, *copy, nb, nlbn, last;
365 long blkcount, factor;
366 int i, nblocks, blocksreleased = 0;
367 int error = 0, allerror = 0;
370 * Calculate index in current block of last
371 * block to be kept. -1 indicates the entire
372 * block so we need not calculate the index.
375 for (i = SINGLE; i < level; i++)
376 factor *= NINDIR(fs);
380 nblocks = btodb(fs->e2fs_bsize);
382 * Get buffer of block pointers, zero those entries corresponding
383 * to blocks to be free'd, and update on disk copy first. Since
384 * double(triple) indirect before single(double) indirect, calls
385 * to bmap on these blocks will fail. However, we already have
386 * the on disk address, so we have to set the b_blkno field
387 * explicitly instead of letting bread do everything for us.
390 bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0, 0);
391 if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
392 bp->b_iocmd = BIO_READ;
393 if (bp->b_bcount > bp->b_bufsize)
394 panic("ext2_indirtrunc: bad buffer size");
396 vfs_busy_pages(bp, 0);
397 bp->b_iooffset = dbtob(bp->b_blkno);
407 bap = (int32_t *)bp->b_data;
408 copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK);
409 bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->e2fs_bsize);
410 bzero((caddr_t)&bap[last + 1],
411 (u_int)(NINDIR(fs) - (last + 1)) * sizeof(int32_t));
413 bp->b_flags |= B_INVAL;
414 if (DOINGASYNC(vp)) {
424 * Recursively free totally unused blocks.
426 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
427 i--, nlbn += factor) {
431 if (level > SINGLE) {
432 if ((error = ext2_indirtrunc(ip, nlbn,
433 fsbtodb(fs, nb), (int32_t)-1, level - 1, &blkcount)) != 0)
435 blocksreleased += blkcount;
437 ext2_blkfree(ip, nb, fs->e2fs_bsize);
438 blocksreleased += nblocks;
442 * Recursively free last partial block.
444 if (level > SINGLE && lastbn >= 0) {
445 last = lastbn % factor;
448 if ((error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
449 last, level - 1, &blkcount)) != 0)
451 blocksreleased += blkcount;
455 *countp = blocksreleased;
460 * discard preallocated blocks
463 ext2_inactive(struct vop_inactive_args *ap)
465 struct vnode *vp = ap->a_vp;
466 struct inode *ip = VTOI(vp);
467 struct thread *td = ap->a_td;
471 * Ignore inodes related to stale file handles.
475 if (ip->i_nlink <= 0) {
476 error = ext2_truncate(vp, (off_t)0, 0, NOCRED, td);
480 ip->i_flag |= IN_CHANGE | IN_UPDATE;
481 ext2_vfree(vp, ip->i_number, mode);
483 if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))
487 * If we are done with the inode, reclaim it
488 * so that it can be reused immediately.
496 * Reclaim an inode so that it can be used for other purposes.
499 ext2_reclaim(struct vop_reclaim_args *ap)
502 struct vnode *vp = ap->a_vp;
505 if (ip->i_flag & IN_LAZYMOD) {
506 ip->i_flag |= IN_MODIFIED;
510 free(vp->v_data, M_EXT2NODE);
512 vnode_destroy_vobject(vp);