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33 * @(#)ffs_balloc.c 8.8 (Berkeley) 6/16/95
34 * $FreeBSD: src/sys/ufs/ffs/ffs_balloc.c,v 1.26.2.1 2002/10/10 19:48:20 dillon Exp $
35 * $DragonFly: src/sys/vfs/ufs/ffs_balloc.c,v 1.4 2003/06/25 03:56:11 dillon Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
43 #include <sys/mount.h>
44 #include <sys/vnode.h>
46 #include <ufs/ufs/quota.h>
47 #include <ufs/ufs/inode.h>
48 #include <ufs/ufs/ufs_extern.h>
50 #include <ufs/ffs/fs.h>
51 #include <ufs/ffs/ffs_extern.h>
54 * Balloc defines the structure of file system storage
55 * by allocating the physical blocks on a device given
56 * the inode and the logical block number in a file.
60 struct vop_balloc_args /* {
78 struct indir indirs[NIADDR + 2];
79 ufs_daddr_t newb, *bap, pref;
80 int deallocated, osize, nsize, num, i, error;
81 ufs_daddr_t *allocib, *blkp, *allocblk, allociblk[NIADDR + 1];
83 struct thread *td = curthread; /* XXX */
88 lbn = lblkno(fs, ap->a_startoffset);
89 size = blkoff(fs, ap->a_startoffset) + ap->a_size;
90 if (size > fs->fs_bsize)
91 panic("ffs_balloc: blk too big");
99 * If the next write will extend the file into a new block,
100 * and the file is currently composed of a fragment
101 * this fragment has to be extended to be a full block.
103 nb = lblkno(fs, ip->i_size);
104 if (nb < NDADDR && nb < lbn) {
105 osize = blksize(fs, ip, nb);
106 if (osize < fs->fs_bsize && osize > 0) {
107 error = ffs_realloccg(ip, nb,
108 ffs_blkpref(ip, nb, (int)nb, &ip->i_db[0]),
109 osize, (int)fs->fs_bsize, cred, &bp);
112 if (DOINGSOFTDEP(vp))
113 softdep_setup_allocdirect(ip, nb,
114 dbtofsb(fs, bp->b_blkno), ip->i_db[nb],
115 fs->fs_bsize, osize, bp);
116 ip->i_size = smalllblktosize(fs, nb + 1);
117 ip->i_db[nb] = dbtofsb(fs, bp->b_blkno);
118 ip->i_flag |= IN_CHANGE | IN_UPDATE;
126 * The first NDADDR blocks are direct blocks
130 if (nb != 0 && ip->i_size >= smalllblktosize(fs, lbn + 1)) {
131 error = bread(vp, lbn, fs->fs_bsize, NOCRED, &bp);
136 bp->b_blkno = fsbtodb(fs, nb);
142 * Consider need to reallocate a fragment.
144 osize = fragroundup(fs, blkoff(fs, ip->i_size));
145 nsize = fragroundup(fs, size);
146 if (nsize <= osize) {
147 error = bread(vp, lbn, osize, NOCRED, &bp);
152 bp->b_blkno = fsbtodb(fs, nb);
154 error = ffs_realloccg(ip, lbn,
155 ffs_blkpref(ip, lbn, (int)lbn,
156 &ip->i_db[0]), osize, nsize, cred, &bp);
159 if (DOINGSOFTDEP(vp))
160 softdep_setup_allocdirect(ip, lbn,
161 dbtofsb(fs, bp->b_blkno), nb,
165 if (ip->i_size < smalllblktosize(fs, lbn + 1))
166 nsize = fragroundup(fs, size);
168 nsize = fs->fs_bsize;
169 error = ffs_alloc(ip, lbn,
170 ffs_blkpref(ip, lbn, (int)lbn, &ip->i_db[0]),
174 bp = getblk(vp, lbn, nsize, 0, 0);
175 bp->b_blkno = fsbtodb(fs, newb);
176 if (flags & B_CLRBUF)
178 if (DOINGSOFTDEP(vp))
179 softdep_setup_allocdirect(ip, lbn, newb, 0,
182 ip->i_db[lbn] = dbtofsb(fs, bp->b_blkno);
183 ip->i_flag |= IN_CHANGE | IN_UPDATE;
188 * Determine the number of levels of indirection.
191 if ((error = ufs_getlbns(vp, lbn, indirs, &num)) != 0)
195 panic ("ffs_balloc: ufs_bmaparray returned indirect block");
198 * Fetch the first indirect block allocating if necessary.
201 nb = ip->i_ib[indirs[0].in_off];
203 allocblk = allociblk;
205 pref = ffs_blkpref(ip, lbn, 0, (ufs_daddr_t *)0);
206 if ((error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize,
211 bp = getblk(vp, indirs[1].in_lbn, fs->fs_bsize, 0, 0);
212 bp->b_blkno = fsbtodb(fs, nb);
214 if (DOINGSOFTDEP(vp)) {
215 softdep_setup_allocdirect(ip, NDADDR + indirs[0].in_off,
216 newb, 0, fs->fs_bsize, 0, bp);
220 * Write synchronously so that indirect blocks
221 * never point at garbage.
225 else if ((error = bwrite(bp)) != 0)
228 allocib = &ip->i_ib[indirs[0].in_off];
230 ip->i_flag |= IN_CHANGE | IN_UPDATE;
233 * Fetch through the indirect blocks, allocating as necessary.
237 indirs[i].in_lbn, (int)fs->fs_bsize, NOCRED, &bp);
242 bap = (ufs_daddr_t *)bp->b_data;
243 nb = bap[indirs[i].in_off];
252 pref = ffs_blkpref(ip, lbn, 0, (ufs_daddr_t *)0);
254 ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, cred, &newb)) != 0) {
260 nbp = getblk(vp, indirs[i].in_lbn, fs->fs_bsize, 0, 0);
261 nbp->b_blkno = fsbtodb(fs, nb);
263 if (DOINGSOFTDEP(vp)) {
264 softdep_setup_allocindir_meta(nbp, ip, bp,
265 indirs[i - 1].in_off, nb);
269 * Write synchronously so that indirect blocks
270 * never point at garbage.
272 if ((error = bwrite(nbp)) != 0) {
277 bap[indirs[i - 1].in_off] = nb;
278 if (allocib == NULL && unwindidx < 0)
281 * If required, write synchronously, otherwise use
284 if (flags & B_SYNC) {
287 if (bp->b_bufsize == fs->fs_bsize)
288 bp->b_flags |= B_CLUSTEROK;
293 * Get the data block, allocating if necessary.
296 pref = ffs_blkpref(ip, lbn, indirs[i].in_off, &bap[0]);
297 error = ffs_alloc(ip,
298 lbn, pref, (int)fs->fs_bsize, cred, &newb);
305 nbp = getblk(vp, lbn, fs->fs_bsize, 0, 0);
306 nbp->b_blkno = fsbtodb(fs, nb);
307 if (flags & B_CLRBUF)
309 if (DOINGSOFTDEP(vp))
310 softdep_setup_allocindir_page(ip, lbn, bp,
311 indirs[i].in_off, nb, 0, nbp);
312 bap[indirs[i].in_off] = nb;
314 * If required, write synchronously, otherwise use
317 if (flags & B_SYNC) {
320 if (bp->b_bufsize == fs->fs_bsize)
321 bp->b_flags |= B_CLUSTEROK;
329 * If requested clear invalid portions of the buffer. If we
330 * have to do a read-before-write (typical if B_CLRBUF is set),
331 * try to do some read-ahead in the sequential case to reduce
332 * the number of I/O transactions.
334 if (flags & B_CLRBUF) {
335 int seqcount = (flags & B_SEQMASK) >> B_SEQSHIFT;
337 (vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
338 error = cluster_read(vp, ip->i_size, lbn,
339 (int)fs->fs_bsize, NOCRED,
340 MAXBSIZE, seqcount, &nbp);
342 error = bread(vp, lbn, (int)fs->fs_bsize, NOCRED, &nbp);
349 nbp = getblk(vp, lbn, fs->fs_bsize, 0, 0);
350 nbp->b_blkno = fsbtodb(fs, nb);
356 * If we have failed part way through block allocation, we
357 * have to deallocate any indirect blocks that we have allocated.
358 * We have to fsync the file before we start to get rid of all
359 * of its dependencies so that we do not leave them dangling.
360 * We have to sync it at the end so that the soft updates code
361 * does not find any untracked changes. Although this is really
362 * slow, running out of disk space is not expected to be a common
363 * occurence. The error return from fsync is ignored as we already
364 * have an error to return to the user.
366 (void) VOP_FSYNC(vp, cred, MNT_WAIT, td);
367 for (deallocated = 0, blkp = allociblk; blkp < allocblk; blkp++) {
368 ffs_blkfree(ip, *blkp, fs->fs_bsize);
369 deallocated += fs->fs_bsize;
371 if (allocib != NULL) {
373 } else if (unwindidx >= 0) {
376 r = bread(vp, indirs[unwindidx].in_lbn,
377 (int)fs->fs_bsize, NOCRED, &bp);
379 panic("Could not unwind indirect block, error %d", r);
382 bap = (ufs_daddr_t *)bp->b_data;
383 bap[indirs[unwindidx].in_off] = 0;
384 if (flags & B_SYNC) {
387 if (bp->b_bufsize == fs->fs_bsize)
388 bp->b_flags |= B_CLUSTEROK;
396 * Restore user's disk quota because allocation failed.
398 (void) chkdq(ip, (long)-btodb(deallocated), cred, FORCE);
400 ip->i_blocks -= btodb(deallocated);
401 ip->i_flag |= IN_CHANGE | IN_UPDATE;
403 (void) VOP_FSYNC(vp, cred, MNT_WAIT, td);