Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
1da177e4 | 21 | #include "xfs_log.h" |
a844f451 | 22 | #include "xfs_inum.h" |
1da177e4 LT |
23 | #include "xfs_trans.h" |
24 | #include "xfs_sb.h" | |
1da177e4 LT |
25 | #include "xfs_dir2.h" |
26 | #include "xfs_dmapi.h" | |
27 | #include "xfs_mount.h" | |
a844f451 | 28 | #include "xfs_da_btree.h" |
1da177e4 | 29 | #include "xfs_bmap_btree.h" |
1da177e4 | 30 | #include "xfs_dir2_sf.h" |
a844f451 | 31 | #include "xfs_attr_sf.h" |
1da177e4 LT |
32 | #include "xfs_dinode.h" |
33 | #include "xfs_inode.h" | |
34 | #include "xfs_bmap.h" | |
1da177e4 LT |
35 | #include "xfs_dir2_data.h" |
36 | #include "xfs_dir2_leaf.h" | |
37 | #include "xfs_dir2_block.h" | |
38 | #include "xfs_dir2_node.h" | |
39 | #include "xfs_dir2_trace.h" | |
40 | #include "xfs_error.h" | |
41 | ||
42 | /* | |
43 | * Function declarations. | |
44 | */ | |
45 | static void xfs_dir2_free_log_header(xfs_trans_t *tp, xfs_dabuf_t *bp); | |
46 | static int xfs_dir2_leafn_add(xfs_dabuf_t *bp, xfs_da_args_t *args, int index); | |
47 | #ifdef DEBUG | |
48 | static void xfs_dir2_leafn_check(xfs_inode_t *dp, xfs_dabuf_t *bp); | |
49 | #else | |
50 | #define xfs_dir2_leafn_check(dp, bp) | |
51 | #endif | |
52 | static void xfs_dir2_leafn_moveents(xfs_da_args_t *args, xfs_dabuf_t *bp_s, | |
53 | int start_s, xfs_dabuf_t *bp_d, int start_d, | |
54 | int count); | |
55 | static void xfs_dir2_leafn_rebalance(xfs_da_state_t *state, | |
56 | xfs_da_state_blk_t *blk1, | |
57 | xfs_da_state_blk_t *blk2); | |
58 | static int xfs_dir2_leafn_remove(xfs_da_args_t *args, xfs_dabuf_t *bp, | |
59 | int index, xfs_da_state_blk_t *dblk, | |
60 | int *rval); | |
61 | static int xfs_dir2_node_addname_int(xfs_da_args_t *args, | |
62 | xfs_da_state_blk_t *fblk); | |
63 | ||
64 | /* | |
65 | * Log entries from a freespace block. | |
66 | */ | |
67 | void | |
68 | xfs_dir2_free_log_bests( | |
69 | xfs_trans_t *tp, /* transaction pointer */ | |
70 | xfs_dabuf_t *bp, /* freespace buffer */ | |
71 | int first, /* first entry to log */ | |
72 | int last) /* last entry to log */ | |
73 | { | |
74 | xfs_dir2_free_t *free; /* freespace structure */ | |
75 | ||
76 | free = bp->data; | |
0ba962ef | 77 | ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC); |
1da177e4 LT |
78 | xfs_da_log_buf(tp, bp, |
79 | (uint)((char *)&free->bests[first] - (char *)free), | |
80 | (uint)((char *)&free->bests[last] - (char *)free + | |
81 | sizeof(free->bests[0]) - 1)); | |
82 | } | |
83 | ||
84 | /* | |
85 | * Log header from a freespace block. | |
86 | */ | |
87 | static void | |
88 | xfs_dir2_free_log_header( | |
89 | xfs_trans_t *tp, /* transaction pointer */ | |
90 | xfs_dabuf_t *bp) /* freespace buffer */ | |
91 | { | |
92 | xfs_dir2_free_t *free; /* freespace structure */ | |
93 | ||
94 | free = bp->data; | |
0ba962ef | 95 | ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC); |
1da177e4 LT |
96 | xfs_da_log_buf(tp, bp, (uint)((char *)&free->hdr - (char *)free), |
97 | (uint)(sizeof(xfs_dir2_free_hdr_t) - 1)); | |
98 | } | |
99 | ||
100 | /* | |
101 | * Convert a leaf-format directory to a node-format directory. | |
102 | * We need to change the magic number of the leaf block, and copy | |
103 | * the freespace table out of the leaf block into its own block. | |
104 | */ | |
105 | int /* error */ | |
106 | xfs_dir2_leaf_to_node( | |
107 | xfs_da_args_t *args, /* operation arguments */ | |
108 | xfs_dabuf_t *lbp) /* leaf buffer */ | |
109 | { | |
110 | xfs_inode_t *dp; /* incore directory inode */ | |
111 | int error; /* error return value */ | |
112 | xfs_dabuf_t *fbp; /* freespace buffer */ | |
113 | xfs_dir2_db_t fdb; /* freespace block number */ | |
114 | xfs_dir2_free_t *free; /* freespace structure */ | |
68b3a102 | 115 | __be16 *from; /* pointer to freespace entry */ |
1da177e4 LT |
116 | int i; /* leaf freespace index */ |
117 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
118 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ | |
119 | xfs_mount_t *mp; /* filesystem mount point */ | |
120 | int n; /* count of live freespc ents */ | |
121 | xfs_dir2_data_off_t off; /* freespace entry value */ | |
0ba962ef | 122 | __be16 *to; /* pointer to freespace entry */ |
1da177e4 LT |
123 | xfs_trans_t *tp; /* transaction pointer */ |
124 | ||
125 | xfs_dir2_trace_args_b("leaf_to_node", args, lbp); | |
126 | dp = args->dp; | |
127 | mp = dp->i_mount; | |
128 | tp = args->trans; | |
129 | /* | |
130 | * Add a freespace block to the directory. | |
131 | */ | |
132 | if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, &fdb))) { | |
133 | return error; | |
134 | } | |
135 | ASSERT(fdb == XFS_DIR2_FREE_FIRSTDB(mp)); | |
136 | /* | |
137 | * Get the buffer for the new freespace block. | |
138 | */ | |
bbaaf538 | 139 | if ((error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, fdb), -1, &fbp, |
1da177e4 LT |
140 | XFS_DATA_FORK))) { |
141 | return error; | |
142 | } | |
143 | ASSERT(fbp != NULL); | |
144 | free = fbp->data; | |
145 | leaf = lbp->data; | |
bbaaf538 | 146 | ltp = xfs_dir2_leaf_tail_p(mp, leaf); |
1da177e4 LT |
147 | /* |
148 | * Initialize the freespace block header. | |
149 | */ | |
0ba962ef | 150 | free->hdr.magic = cpu_to_be32(XFS_DIR2_FREE_MAGIC); |
1da177e4 | 151 | free->hdr.firstdb = 0; |
afbcb3f9 | 152 | ASSERT(be32_to_cpu(ltp->bestcount) <= (uint)dp->i_d.di_size / mp->m_dirblksize); |
0ba962ef | 153 | free->hdr.nvalid = ltp->bestcount; |
1da177e4 LT |
154 | /* |
155 | * Copy freespace entries from the leaf block to the new block. | |
156 | * Count active entries. | |
157 | */ | |
bbaaf538 | 158 | for (i = n = 0, from = xfs_dir2_leaf_bests_p(ltp), to = free->bests; |
afbcb3f9 | 159 | i < be32_to_cpu(ltp->bestcount); i++, from++, to++) { |
68b3a102 | 160 | if ((off = be16_to_cpu(*from)) != NULLDATAOFF) |
1da177e4 | 161 | n++; |
0ba962ef | 162 | *to = cpu_to_be16(off); |
1da177e4 | 163 | } |
0ba962ef | 164 | free->hdr.nused = cpu_to_be32(n); |
89da0544 | 165 | leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAFN_MAGIC); |
1da177e4 LT |
166 | /* |
167 | * Log everything. | |
168 | */ | |
169 | xfs_dir2_leaf_log_header(tp, lbp); | |
170 | xfs_dir2_free_log_header(tp, fbp); | |
0ba962ef | 171 | xfs_dir2_free_log_bests(tp, fbp, 0, be32_to_cpu(free->hdr.nvalid) - 1); |
1da177e4 LT |
172 | xfs_da_buf_done(fbp); |
173 | xfs_dir2_leafn_check(dp, lbp); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Add a leaf entry to a leaf block in a node-form directory. | |
179 | * The other work necessary is done from the caller. | |
180 | */ | |
181 | static int /* error */ | |
182 | xfs_dir2_leafn_add( | |
183 | xfs_dabuf_t *bp, /* leaf buffer */ | |
184 | xfs_da_args_t *args, /* operation arguments */ | |
185 | int index) /* insertion pt for new entry */ | |
186 | { | |
187 | int compact; /* compacting stale leaves */ | |
188 | xfs_inode_t *dp; /* incore directory inode */ | |
189 | int highstale; /* next stale entry */ | |
190 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
191 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
192 | int lfloghigh; /* high leaf entry logging */ | |
193 | int lfloglow; /* low leaf entry logging */ | |
194 | int lowstale; /* previous stale entry */ | |
195 | xfs_mount_t *mp; /* filesystem mount point */ | |
196 | xfs_trans_t *tp; /* transaction pointer */ | |
197 | ||
198 | xfs_dir2_trace_args_sb("leafn_add", args, index, bp); | |
199 | dp = args->dp; | |
200 | mp = dp->i_mount; | |
201 | tp = args->trans; | |
202 | leaf = bp->data; | |
203 | ||
204 | /* | |
205 | * Quick check just to make sure we are not going to index | |
206 | * into other peoples memory | |
207 | */ | |
208 | if (index < 0) | |
209 | return XFS_ERROR(EFSCORRUPTED); | |
210 | ||
211 | /* | |
212 | * If there are already the maximum number of leaf entries in | |
213 | * the block, if there are no stale entries it won't fit. | |
214 | * Caller will do a split. If there are stale entries we'll do | |
215 | * a compact. | |
216 | */ | |
217 | ||
bbaaf538 | 218 | if (be16_to_cpu(leaf->hdr.count) == xfs_dir2_max_leaf_ents(mp)) { |
1da177e4 LT |
219 | if (!leaf->hdr.stale) |
220 | return XFS_ERROR(ENOSPC); | |
a818e5de | 221 | compact = be16_to_cpu(leaf->hdr.stale) > 1; |
1da177e4 LT |
222 | } else |
223 | compact = 0; | |
3c1f9c15 | 224 | ASSERT(index == 0 || be32_to_cpu(leaf->ents[index - 1].hashval) <= args->hashval); |
a818e5de | 225 | ASSERT(index == be16_to_cpu(leaf->hdr.count) || |
3c1f9c15 | 226 | be32_to_cpu(leaf->ents[index].hashval) >= args->hashval); |
1da177e4 LT |
227 | |
228 | if (args->justcheck) | |
229 | return 0; | |
230 | ||
231 | /* | |
232 | * Compact out all but one stale leaf entry. Leaves behind | |
233 | * the entry closest to index. | |
234 | */ | |
235 | if (compact) { | |
236 | xfs_dir2_leaf_compact_x1(bp, &index, &lowstale, &highstale, | |
237 | &lfloglow, &lfloghigh); | |
238 | } | |
239 | /* | |
240 | * Set impossible logging indices for this case. | |
241 | */ | |
242 | else if (leaf->hdr.stale) { | |
a818e5de | 243 | lfloglow = be16_to_cpu(leaf->hdr.count); |
1da177e4 LT |
244 | lfloghigh = -1; |
245 | } | |
246 | /* | |
247 | * No stale entries, just insert a space for the new entry. | |
248 | */ | |
249 | if (!leaf->hdr.stale) { | |
250 | lep = &leaf->ents[index]; | |
a818e5de | 251 | if (index < be16_to_cpu(leaf->hdr.count)) |
1da177e4 | 252 | memmove(lep + 1, lep, |
a818e5de | 253 | (be16_to_cpu(leaf->hdr.count) - index) * sizeof(*lep)); |
1da177e4 | 254 | lfloglow = index; |
a818e5de NS |
255 | lfloghigh = be16_to_cpu(leaf->hdr.count); |
256 | be16_add(&leaf->hdr.count, 1); | |
1da177e4 LT |
257 | } |
258 | /* | |
259 | * There are stale entries. We'll use one for the new entry. | |
260 | */ | |
261 | else { | |
262 | /* | |
263 | * If we didn't do a compact then we need to figure out | |
264 | * which stale entry will be used. | |
265 | */ | |
266 | if (compact == 0) { | |
267 | /* | |
268 | * Find first stale entry before our insertion point. | |
269 | */ | |
270 | for (lowstale = index - 1; | |
271 | lowstale >= 0 && | |
3c1f9c15 | 272 | be32_to_cpu(leaf->ents[lowstale].address) != |
1da177e4 LT |
273 | XFS_DIR2_NULL_DATAPTR; |
274 | lowstale--) | |
275 | continue; | |
276 | /* | |
277 | * Find next stale entry after insertion point. | |
278 | * Stop looking if the answer would be worse than | |
279 | * lowstale already found. | |
280 | */ | |
281 | for (highstale = index; | |
a818e5de | 282 | highstale < be16_to_cpu(leaf->hdr.count) && |
3c1f9c15 | 283 | be32_to_cpu(leaf->ents[highstale].address) != |
1da177e4 LT |
284 | XFS_DIR2_NULL_DATAPTR && |
285 | (lowstale < 0 || | |
286 | index - lowstale - 1 >= highstale - index); | |
287 | highstale++) | |
288 | continue; | |
289 | } | |
290 | /* | |
291 | * Using the low stale entry. | |
292 | * Shift entries up toward the stale slot. | |
293 | */ | |
294 | if (lowstale >= 0 && | |
a818e5de | 295 | (highstale == be16_to_cpu(leaf->hdr.count) || |
1da177e4 | 296 | index - lowstale - 1 < highstale - index)) { |
3c1f9c15 | 297 | ASSERT(be32_to_cpu(leaf->ents[lowstale].address) == |
1da177e4 LT |
298 | XFS_DIR2_NULL_DATAPTR); |
299 | ASSERT(index - lowstale - 1 >= 0); | |
300 | if (index - lowstale - 1 > 0) | |
301 | memmove(&leaf->ents[lowstale], | |
302 | &leaf->ents[lowstale + 1], | |
303 | (index - lowstale - 1) * sizeof(*lep)); | |
304 | lep = &leaf->ents[index - 1]; | |
305 | lfloglow = MIN(lowstale, lfloglow); | |
306 | lfloghigh = MAX(index - 1, lfloghigh); | |
307 | } | |
308 | /* | |
309 | * Using the high stale entry. | |
310 | * Shift entries down toward the stale slot. | |
311 | */ | |
312 | else { | |
3c1f9c15 | 313 | ASSERT(be32_to_cpu(leaf->ents[highstale].address) == |
1da177e4 LT |
314 | XFS_DIR2_NULL_DATAPTR); |
315 | ASSERT(highstale - index >= 0); | |
316 | if (highstale - index > 0) | |
317 | memmove(&leaf->ents[index + 1], | |
318 | &leaf->ents[index], | |
319 | (highstale - index) * sizeof(*lep)); | |
320 | lep = &leaf->ents[index]; | |
321 | lfloglow = MIN(index, lfloglow); | |
322 | lfloghigh = MAX(highstale, lfloghigh); | |
323 | } | |
a818e5de | 324 | be16_add(&leaf->hdr.stale, -1); |
1da177e4 LT |
325 | } |
326 | /* | |
327 | * Insert the new entry, log everything. | |
328 | */ | |
3c1f9c15 | 329 | lep->hashval = cpu_to_be32(args->hashval); |
bbaaf538 | 330 | lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(mp, |
3c1f9c15 | 331 | args->blkno, args->index)); |
1da177e4 LT |
332 | xfs_dir2_leaf_log_header(tp, bp); |
333 | xfs_dir2_leaf_log_ents(tp, bp, lfloglow, lfloghigh); | |
334 | xfs_dir2_leafn_check(dp, bp); | |
335 | return 0; | |
336 | } | |
337 | ||
338 | #ifdef DEBUG | |
339 | /* | |
340 | * Check internal consistency of a leafn block. | |
341 | */ | |
342 | void | |
343 | xfs_dir2_leafn_check( | |
344 | xfs_inode_t *dp, /* incore directory inode */ | |
345 | xfs_dabuf_t *bp) /* leaf buffer */ | |
346 | { | |
347 | int i; /* leaf index */ | |
348 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
349 | xfs_mount_t *mp; /* filesystem mount point */ | |
350 | int stale; /* count of stale leaves */ | |
351 | ||
352 | leaf = bp->data; | |
353 | mp = dp->i_mount; | |
89da0544 | 354 | ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); |
bbaaf538 | 355 | ASSERT(be16_to_cpu(leaf->hdr.count) <= xfs_dir2_max_leaf_ents(mp)); |
a818e5de NS |
356 | for (i = stale = 0; i < be16_to_cpu(leaf->hdr.count); i++) { |
357 | if (i + 1 < be16_to_cpu(leaf->hdr.count)) { | |
3c1f9c15 NS |
358 | ASSERT(be32_to_cpu(leaf->ents[i].hashval) <= |
359 | be32_to_cpu(leaf->ents[i + 1].hashval)); | |
1da177e4 | 360 | } |
3c1f9c15 | 361 | if (be32_to_cpu(leaf->ents[i].address) == XFS_DIR2_NULL_DATAPTR) |
1da177e4 LT |
362 | stale++; |
363 | } | |
a818e5de | 364 | ASSERT(be16_to_cpu(leaf->hdr.stale) == stale); |
1da177e4 LT |
365 | } |
366 | #endif /* DEBUG */ | |
367 | ||
368 | /* | |
369 | * Return the last hash value in the leaf. | |
370 | * Stale entries are ok. | |
371 | */ | |
372 | xfs_dahash_t /* hash value */ | |
373 | xfs_dir2_leafn_lasthash( | |
374 | xfs_dabuf_t *bp, /* leaf buffer */ | |
375 | int *count) /* count of entries in leaf */ | |
376 | { | |
377 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
378 | ||
379 | leaf = bp->data; | |
89da0544 | 380 | ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); |
1da177e4 | 381 | if (count) |
a818e5de | 382 | *count = be16_to_cpu(leaf->hdr.count); |
1da177e4 LT |
383 | if (!leaf->hdr.count) |
384 | return 0; | |
3c1f9c15 | 385 | return be32_to_cpu(leaf->ents[be16_to_cpu(leaf->hdr.count) - 1].hashval); |
1da177e4 LT |
386 | } |
387 | ||
388 | /* | |
389 | * Look up a leaf entry in a node-format leaf block. | |
390 | * If this is an addname then the extrablk in state is a freespace block, | |
391 | * otherwise it's a data block. | |
392 | */ | |
393 | int | |
394 | xfs_dir2_leafn_lookup_int( | |
395 | xfs_dabuf_t *bp, /* leaf buffer */ | |
396 | xfs_da_args_t *args, /* operation arguments */ | |
397 | int *indexp, /* out: leaf entry index */ | |
398 | xfs_da_state_t *state) /* state to fill in */ | |
399 | { | |
400 | xfs_dabuf_t *curbp; /* current data/free buffer */ | |
401 | xfs_dir2_db_t curdb; /* current data block number */ | |
402 | xfs_dir2_db_t curfdb; /* current free block number */ | |
403 | xfs_dir2_data_entry_t *dep; /* data block entry */ | |
404 | xfs_inode_t *dp; /* incore directory inode */ | |
405 | int error; /* error return value */ | |
406 | int fi; /* free entry index */ | |
407 | xfs_dir2_free_t *free=NULL; /* free block structure */ | |
408 | int index; /* leaf entry index */ | |
409 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
410 | int length=0; /* length of new data entry */ | |
411 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
412 | xfs_mount_t *mp; /* filesystem mount point */ | |
413 | xfs_dir2_db_t newdb; /* new data block number */ | |
414 | xfs_dir2_db_t newfdb; /* new free block number */ | |
415 | xfs_trans_t *tp; /* transaction pointer */ | |
416 | ||
417 | dp = args->dp; | |
418 | tp = args->trans; | |
419 | mp = dp->i_mount; | |
420 | leaf = bp->data; | |
89da0544 | 421 | ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); |
1da177e4 | 422 | #ifdef __KERNEL__ |
a818e5de | 423 | ASSERT(be16_to_cpu(leaf->hdr.count) > 0); |
1da177e4 LT |
424 | #endif |
425 | xfs_dir2_leafn_check(dp, bp); | |
426 | /* | |
427 | * Look up the hash value in the leaf entries. | |
428 | */ | |
429 | index = xfs_dir2_leaf_search_hash(args, bp); | |
430 | /* | |
431 | * Do we have a buffer coming in? | |
432 | */ | |
433 | if (state->extravalid) | |
434 | curbp = state->extrablk.bp; | |
435 | else | |
436 | curbp = NULL; | |
437 | /* | |
438 | * For addname, it's a free block buffer, get the block number. | |
439 | */ | |
440 | if (args->addname) { | |
441 | curfdb = curbp ? state->extrablk.blkno : -1; | |
442 | curdb = -1; | |
bbaaf538 | 443 | length = xfs_dir2_data_entsize(args->namelen); |
1da177e4 | 444 | if ((free = (curbp ? curbp->data : NULL))) |
0ba962ef | 445 | ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC); |
1da177e4 LT |
446 | } |
447 | /* | |
448 | * For others, it's a data block buffer, get the block number. | |
449 | */ | |
450 | else { | |
451 | curfdb = -1; | |
452 | curdb = curbp ? state->extrablk.blkno : -1; | |
453 | } | |
454 | /* | |
455 | * Loop over leaf entries with the right hash value. | |
456 | */ | |
457 | for (lep = &leaf->ents[index]; | |
3c1f9c15 | 458 | index < be16_to_cpu(leaf->hdr.count) && be32_to_cpu(lep->hashval) == args->hashval; |
1da177e4 LT |
459 | lep++, index++) { |
460 | /* | |
461 | * Skip stale leaf entries. | |
462 | */ | |
3c1f9c15 | 463 | if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR) |
1da177e4 LT |
464 | continue; |
465 | /* | |
466 | * Pull the data block number from the entry. | |
467 | */ | |
bbaaf538 | 468 | newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); |
1da177e4 LT |
469 | /* |
470 | * For addname, we're looking for a place to put the new entry. | |
471 | * We want to use a data block with an entry of equal | |
472 | * hash value to ours if there is one with room. | |
473 | */ | |
474 | if (args->addname) { | |
475 | /* | |
476 | * If this block isn't the data block we already have | |
477 | * in hand, take a look at it. | |
478 | */ | |
479 | if (newdb != curdb) { | |
480 | curdb = newdb; | |
481 | /* | |
482 | * Convert the data block to the free block | |
483 | * holding its freespace information. | |
484 | */ | |
bbaaf538 | 485 | newfdb = xfs_dir2_db_to_fdb(mp, newdb); |
1da177e4 LT |
486 | /* |
487 | * If it's not the one we have in hand, | |
488 | * read it in. | |
489 | */ | |
490 | if (newfdb != curfdb) { | |
491 | /* | |
492 | * If we had one before, drop it. | |
493 | */ | |
494 | if (curbp) | |
495 | xfs_da_brelse(tp, curbp); | |
496 | /* | |
497 | * Read the free block. | |
498 | */ | |
499 | if ((error = xfs_da_read_buf(tp, dp, | |
bbaaf538 | 500 | xfs_dir2_db_to_da(mp, |
1da177e4 LT |
501 | newfdb), |
502 | -1, &curbp, | |
503 | XFS_DATA_FORK))) { | |
504 | return error; | |
505 | } | |
1da177e4 | 506 | free = curbp->data; |
0ba962ef | 507 | ASSERT(be32_to_cpu(free->hdr.magic) == |
1da177e4 | 508 | XFS_DIR2_FREE_MAGIC); |
0ba962ef | 509 | ASSERT((be32_to_cpu(free->hdr.firstdb) % |
1da177e4 LT |
510 | XFS_DIR2_MAX_FREE_BESTS(mp)) == |
511 | 0); | |
0ba962ef | 512 | ASSERT(be32_to_cpu(free->hdr.firstdb) <= curdb); |
1da177e4 | 513 | ASSERT(curdb < |
0ba962ef NS |
514 | be32_to_cpu(free->hdr.firstdb) + |
515 | be32_to_cpu(free->hdr.nvalid)); | |
1da177e4 LT |
516 | } |
517 | /* | |
518 | * Get the index for our entry. | |
519 | */ | |
bbaaf538 | 520 | fi = xfs_dir2_db_to_fdindex(mp, curdb); |
1da177e4 LT |
521 | /* |
522 | * If it has room, return it. | |
523 | */ | |
0ba962ef | 524 | if (unlikely(be16_to_cpu(free->bests[fi]) == NULLDATAOFF)) { |
1da177e4 LT |
525 | XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int", |
526 | XFS_ERRLEVEL_LOW, mp); | |
e1090074 NS |
527 | if (curfdb != newfdb) |
528 | xfs_da_brelse(tp, curbp); | |
1da177e4 LT |
529 | return XFS_ERROR(EFSCORRUPTED); |
530 | } | |
e1090074 | 531 | curfdb = newfdb; |
0ba962ef | 532 | if (be16_to_cpu(free->bests[fi]) >= length) { |
1da177e4 LT |
533 | *indexp = index; |
534 | state->extravalid = 1; | |
535 | state->extrablk.bp = curbp; | |
536 | state->extrablk.blkno = curfdb; | |
537 | state->extrablk.index = fi; | |
538 | state->extrablk.magic = | |
539 | XFS_DIR2_FREE_MAGIC; | |
540 | ASSERT(args->oknoent); | |
541 | return XFS_ERROR(ENOENT); | |
542 | } | |
543 | } | |
544 | } | |
545 | /* | |
546 | * Not adding a new entry, so we really want to find | |
547 | * the name given to us. | |
548 | */ | |
549 | else { | |
550 | /* | |
551 | * If it's a different data block, go get it. | |
552 | */ | |
553 | if (newdb != curdb) { | |
554 | /* | |
555 | * If we had a block before, drop it. | |
556 | */ | |
557 | if (curbp) | |
558 | xfs_da_brelse(tp, curbp); | |
559 | /* | |
560 | * Read the data block. | |
561 | */ | |
562 | if ((error = | |
563 | xfs_da_read_buf(tp, dp, | |
bbaaf538 | 564 | xfs_dir2_db_to_da(mp, newdb), -1, |
1da177e4 LT |
565 | &curbp, XFS_DATA_FORK))) { |
566 | return error; | |
567 | } | |
568 | xfs_dir2_data_check(dp, curbp); | |
569 | curdb = newdb; | |
570 | } | |
571 | /* | |
572 | * Point to the data entry. | |
573 | */ | |
574 | dep = (xfs_dir2_data_entry_t *) | |
575 | ((char *)curbp->data + | |
bbaaf538 | 576 | xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address))); |
1da177e4 LT |
577 | /* |
578 | * Compare the entry, return it if it matches. | |
579 | */ | |
580 | if (dep->namelen == args->namelen && | |
581 | dep->name[0] == args->name[0] && | |
582 | memcmp(dep->name, args->name, args->namelen) == 0) { | |
ff9901c1 | 583 | args->inumber = be64_to_cpu(dep->inumber); |
1da177e4 LT |
584 | *indexp = index; |
585 | state->extravalid = 1; | |
586 | state->extrablk.bp = curbp; | |
587 | state->extrablk.blkno = curdb; | |
588 | state->extrablk.index = | |
589 | (int)((char *)dep - | |
590 | (char *)curbp->data); | |
591 | state->extrablk.magic = XFS_DIR2_DATA_MAGIC; | |
592 | return XFS_ERROR(EEXIST); | |
593 | } | |
594 | } | |
595 | } | |
596 | /* | |
597 | * Didn't find a match. | |
598 | * If we are holding a buffer, give it back in case our caller | |
599 | * finds it useful. | |
600 | */ | |
601 | if ((state->extravalid = (curbp != NULL))) { | |
602 | state->extrablk.bp = curbp; | |
603 | state->extrablk.index = -1; | |
604 | /* | |
605 | * For addname, giving back a free block. | |
606 | */ | |
607 | if (args->addname) { | |
608 | state->extrablk.blkno = curfdb; | |
609 | state->extrablk.magic = XFS_DIR2_FREE_MAGIC; | |
610 | } | |
611 | /* | |
612 | * For other callers, giving back a data block. | |
613 | */ | |
614 | else { | |
615 | state->extrablk.blkno = curdb; | |
616 | state->extrablk.magic = XFS_DIR2_DATA_MAGIC; | |
617 | } | |
618 | } | |
619 | /* | |
620 | * Return the final index, that will be the insertion point. | |
621 | */ | |
622 | *indexp = index; | |
a818e5de | 623 | ASSERT(index == be16_to_cpu(leaf->hdr.count) || args->oknoent); |
1da177e4 LT |
624 | return XFS_ERROR(ENOENT); |
625 | } | |
626 | ||
627 | /* | |
628 | * Move count leaf entries from source to destination leaf. | |
629 | * Log entries and headers. Stale entries are preserved. | |
630 | */ | |
631 | static void | |
632 | xfs_dir2_leafn_moveents( | |
633 | xfs_da_args_t *args, /* operation arguments */ | |
634 | xfs_dabuf_t *bp_s, /* source leaf buffer */ | |
635 | int start_s, /* source leaf index */ | |
636 | xfs_dabuf_t *bp_d, /* destination leaf buffer */ | |
637 | int start_d, /* destination leaf index */ | |
638 | int count) /* count of leaves to copy */ | |
639 | { | |
640 | xfs_dir2_leaf_t *leaf_d; /* destination leaf structure */ | |
641 | xfs_dir2_leaf_t *leaf_s; /* source leaf structure */ | |
642 | int stale; /* count stale leaves copied */ | |
643 | xfs_trans_t *tp; /* transaction pointer */ | |
644 | ||
645 | xfs_dir2_trace_args_bibii("leafn_moveents", args, bp_s, start_s, bp_d, | |
646 | start_d, count); | |
647 | /* | |
648 | * Silently return if nothing to do. | |
649 | */ | |
650 | if (count == 0) { | |
651 | return; | |
652 | } | |
653 | tp = args->trans; | |
654 | leaf_s = bp_s->data; | |
655 | leaf_d = bp_d->data; | |
656 | /* | |
657 | * If the destination index is not the end of the current | |
658 | * destination leaf entries, open up a hole in the destination | |
659 | * to hold the new entries. | |
660 | */ | |
a818e5de | 661 | if (start_d < be16_to_cpu(leaf_d->hdr.count)) { |
1da177e4 | 662 | memmove(&leaf_d->ents[start_d + count], &leaf_d->ents[start_d], |
a818e5de | 663 | (be16_to_cpu(leaf_d->hdr.count) - start_d) * |
1da177e4 LT |
664 | sizeof(xfs_dir2_leaf_entry_t)); |
665 | xfs_dir2_leaf_log_ents(tp, bp_d, start_d + count, | |
a818e5de | 666 | count + be16_to_cpu(leaf_d->hdr.count) - 1); |
1da177e4 LT |
667 | } |
668 | /* | |
669 | * If the source has stale leaves, count the ones in the copy range | |
670 | * so we can update the header correctly. | |
671 | */ | |
672 | if (leaf_s->hdr.stale) { | |
673 | int i; /* temp leaf index */ | |
674 | ||
675 | for (i = start_s, stale = 0; i < start_s + count; i++) { | |
3c1f9c15 | 676 | if (be32_to_cpu(leaf_s->ents[i].address) == XFS_DIR2_NULL_DATAPTR) |
1da177e4 LT |
677 | stale++; |
678 | } | |
679 | } else | |
680 | stale = 0; | |
681 | /* | |
682 | * Copy the leaf entries from source to destination. | |
683 | */ | |
684 | memcpy(&leaf_d->ents[start_d], &leaf_s->ents[start_s], | |
685 | count * sizeof(xfs_dir2_leaf_entry_t)); | |
686 | xfs_dir2_leaf_log_ents(tp, bp_d, start_d, start_d + count - 1); | |
687 | /* | |
688 | * If there are source entries after the ones we copied, | |
689 | * delete the ones we copied by sliding the next ones down. | |
690 | */ | |
a818e5de | 691 | if (start_s + count < be16_to_cpu(leaf_s->hdr.count)) { |
1da177e4 LT |
692 | memmove(&leaf_s->ents[start_s], &leaf_s->ents[start_s + count], |
693 | count * sizeof(xfs_dir2_leaf_entry_t)); | |
694 | xfs_dir2_leaf_log_ents(tp, bp_s, start_s, start_s + count - 1); | |
695 | } | |
696 | /* | |
697 | * Update the headers and log them. | |
698 | */ | |
a818e5de NS |
699 | be16_add(&leaf_s->hdr.count, -(count)); |
700 | be16_add(&leaf_s->hdr.stale, -(stale)); | |
701 | be16_add(&leaf_d->hdr.count, count); | |
702 | be16_add(&leaf_d->hdr.stale, stale); | |
1da177e4 LT |
703 | xfs_dir2_leaf_log_header(tp, bp_s); |
704 | xfs_dir2_leaf_log_header(tp, bp_d); | |
705 | xfs_dir2_leafn_check(args->dp, bp_s); | |
706 | xfs_dir2_leafn_check(args->dp, bp_d); | |
707 | } | |
708 | ||
709 | /* | |
710 | * Determine the sort order of two leaf blocks. | |
711 | * Returns 1 if both are valid and leaf2 should be before leaf1, else 0. | |
712 | */ | |
713 | int /* sort order */ | |
714 | xfs_dir2_leafn_order( | |
715 | xfs_dabuf_t *leaf1_bp, /* leaf1 buffer */ | |
716 | xfs_dabuf_t *leaf2_bp) /* leaf2 buffer */ | |
717 | { | |
718 | xfs_dir2_leaf_t *leaf1; /* leaf1 structure */ | |
719 | xfs_dir2_leaf_t *leaf2; /* leaf2 structure */ | |
720 | ||
721 | leaf1 = leaf1_bp->data; | |
722 | leaf2 = leaf2_bp->data; | |
89da0544 NS |
723 | ASSERT(be16_to_cpu(leaf1->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); |
724 | ASSERT(be16_to_cpu(leaf2->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); | |
a818e5de NS |
725 | if (be16_to_cpu(leaf1->hdr.count) > 0 && |
726 | be16_to_cpu(leaf2->hdr.count) > 0 && | |
3c1f9c15 NS |
727 | (be32_to_cpu(leaf2->ents[0].hashval) < be32_to_cpu(leaf1->ents[0].hashval) || |
728 | be32_to_cpu(leaf2->ents[be16_to_cpu(leaf2->hdr.count) - 1].hashval) < | |
729 | be32_to_cpu(leaf1->ents[be16_to_cpu(leaf1->hdr.count) - 1].hashval))) | |
1da177e4 LT |
730 | return 1; |
731 | return 0; | |
732 | } | |
733 | ||
734 | /* | |
735 | * Rebalance leaf entries between two leaf blocks. | |
736 | * This is actually only called when the second block is new, | |
737 | * though the code deals with the general case. | |
738 | * A new entry will be inserted in one of the blocks, and that | |
739 | * entry is taken into account when balancing. | |
740 | */ | |
741 | static void | |
742 | xfs_dir2_leafn_rebalance( | |
743 | xfs_da_state_t *state, /* btree cursor */ | |
744 | xfs_da_state_blk_t *blk1, /* first btree block */ | |
745 | xfs_da_state_blk_t *blk2) /* second btree block */ | |
746 | { | |
747 | xfs_da_args_t *args; /* operation arguments */ | |
748 | int count; /* count (& direction) leaves */ | |
749 | int isleft; /* new goes in left leaf */ | |
750 | xfs_dir2_leaf_t *leaf1; /* first leaf structure */ | |
751 | xfs_dir2_leaf_t *leaf2; /* second leaf structure */ | |
752 | int mid; /* midpoint leaf index */ | |
753 | #ifdef DEBUG | |
754 | int oldstale; /* old count of stale leaves */ | |
755 | #endif | |
756 | int oldsum; /* old total leaf count */ | |
757 | int swap; /* swapped leaf blocks */ | |
758 | ||
759 | args = state->args; | |
760 | /* | |
761 | * If the block order is wrong, swap the arguments. | |
762 | */ | |
763 | if ((swap = xfs_dir2_leafn_order(blk1->bp, blk2->bp))) { | |
764 | xfs_da_state_blk_t *tmp; /* temp for block swap */ | |
765 | ||
766 | tmp = blk1; | |
767 | blk1 = blk2; | |
768 | blk2 = tmp; | |
769 | } | |
770 | leaf1 = blk1->bp->data; | |
771 | leaf2 = blk2->bp->data; | |
a818e5de | 772 | oldsum = be16_to_cpu(leaf1->hdr.count) + be16_to_cpu(leaf2->hdr.count); |
1da177e4 | 773 | #ifdef DEBUG |
a818e5de | 774 | oldstale = be16_to_cpu(leaf1->hdr.stale) + be16_to_cpu(leaf2->hdr.stale); |
1da177e4 LT |
775 | #endif |
776 | mid = oldsum >> 1; | |
777 | /* | |
778 | * If the old leaf count was odd then the new one will be even, | |
779 | * so we need to divide the new count evenly. | |
780 | */ | |
781 | if (oldsum & 1) { | |
782 | xfs_dahash_t midhash; /* middle entry hash value */ | |
783 | ||
a818e5de | 784 | if (mid >= be16_to_cpu(leaf1->hdr.count)) |
3c1f9c15 | 785 | midhash = be32_to_cpu(leaf2->ents[mid - be16_to_cpu(leaf1->hdr.count)].hashval); |
1da177e4 | 786 | else |
3c1f9c15 | 787 | midhash = be32_to_cpu(leaf1->ents[mid].hashval); |
1da177e4 LT |
788 | isleft = args->hashval <= midhash; |
789 | } | |
790 | /* | |
791 | * If the old count is even then the new count is odd, so there's | |
792 | * no preferred side for the new entry. | |
793 | * Pick the left one. | |
794 | */ | |
795 | else | |
796 | isleft = 1; | |
797 | /* | |
798 | * Calculate moved entry count. Positive means left-to-right, | |
799 | * negative means right-to-left. Then move the entries. | |
800 | */ | |
a818e5de | 801 | count = be16_to_cpu(leaf1->hdr.count) - mid + (isleft == 0); |
1da177e4 LT |
802 | if (count > 0) |
803 | xfs_dir2_leafn_moveents(args, blk1->bp, | |
a818e5de | 804 | be16_to_cpu(leaf1->hdr.count) - count, blk2->bp, 0, count); |
1da177e4 LT |
805 | else if (count < 0) |
806 | xfs_dir2_leafn_moveents(args, blk2->bp, 0, blk1->bp, | |
a818e5de NS |
807 | be16_to_cpu(leaf1->hdr.count), count); |
808 | ASSERT(be16_to_cpu(leaf1->hdr.count) + be16_to_cpu(leaf2->hdr.count) == oldsum); | |
809 | ASSERT(be16_to_cpu(leaf1->hdr.stale) + be16_to_cpu(leaf2->hdr.stale) == oldstale); | |
1da177e4 LT |
810 | /* |
811 | * Mark whether we're inserting into the old or new leaf. | |
812 | */ | |
a818e5de | 813 | if (be16_to_cpu(leaf1->hdr.count) < be16_to_cpu(leaf2->hdr.count)) |
1da177e4 | 814 | state->inleaf = swap; |
a818e5de | 815 | else if (be16_to_cpu(leaf1->hdr.count) > be16_to_cpu(leaf2->hdr.count)) |
1da177e4 LT |
816 | state->inleaf = !swap; |
817 | else | |
818 | state->inleaf = | |
a818e5de | 819 | swap ^ (blk1->index <= be16_to_cpu(leaf1->hdr.count)); |
1da177e4 LT |
820 | /* |
821 | * Adjust the expected index for insertion. | |
822 | */ | |
823 | if (!state->inleaf) | |
a818e5de | 824 | blk2->index = blk1->index - be16_to_cpu(leaf1->hdr.count); |
1da177e4 LT |
825 | |
826 | /* | |
827 | * Finally sanity check just to make sure we are not returning a negative index | |
828 | */ | |
829 | if(blk2->index < 0) { | |
830 | state->inleaf = 1; | |
831 | blk2->index = 0; | |
832 | cmn_err(CE_ALERT, | |
c41564b5 | 833 | "xfs_dir2_leafn_rebalance: picked the wrong leaf? reverting original leaf: " |
1da177e4 LT |
834 | "blk1->index %d\n", |
835 | blk1->index); | |
836 | } | |
837 | } | |
838 | ||
839 | /* | |
840 | * Remove an entry from a node directory. | |
841 | * This removes the leaf entry and the data entry, | |
842 | * and updates the free block if necessary. | |
843 | */ | |
844 | static int /* error */ | |
845 | xfs_dir2_leafn_remove( | |
846 | xfs_da_args_t *args, /* operation arguments */ | |
847 | xfs_dabuf_t *bp, /* leaf buffer */ | |
848 | int index, /* leaf entry index */ | |
849 | xfs_da_state_blk_t *dblk, /* data block */ | |
850 | int *rval) /* resulting block needs join */ | |
851 | { | |
852 | xfs_dir2_data_t *data; /* data block structure */ | |
853 | xfs_dir2_db_t db; /* data block number */ | |
854 | xfs_dabuf_t *dbp; /* data block buffer */ | |
855 | xfs_dir2_data_entry_t *dep; /* data block entry */ | |
856 | xfs_inode_t *dp; /* incore directory inode */ | |
857 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
858 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
859 | int longest; /* longest data free entry */ | |
860 | int off; /* data block entry offset */ | |
861 | xfs_mount_t *mp; /* filesystem mount point */ | |
862 | int needlog; /* need to log data header */ | |
863 | int needscan; /* need to rescan data frees */ | |
864 | xfs_trans_t *tp; /* transaction pointer */ | |
865 | ||
866 | xfs_dir2_trace_args_sb("leafn_remove", args, index, bp); | |
867 | dp = args->dp; | |
868 | tp = args->trans; | |
869 | mp = dp->i_mount; | |
870 | leaf = bp->data; | |
89da0544 | 871 | ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); |
1da177e4 LT |
872 | /* |
873 | * Point to the entry we're removing. | |
874 | */ | |
875 | lep = &leaf->ents[index]; | |
876 | /* | |
877 | * Extract the data block and offset from the entry. | |
878 | */ | |
bbaaf538 | 879 | db = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); |
1da177e4 | 880 | ASSERT(dblk->blkno == db); |
bbaaf538 | 881 | off = xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)); |
1da177e4 LT |
882 | ASSERT(dblk->index == off); |
883 | /* | |
884 | * Kill the leaf entry by marking it stale. | |
885 | * Log the leaf block changes. | |
886 | */ | |
a818e5de | 887 | be16_add(&leaf->hdr.stale, 1); |
1da177e4 | 888 | xfs_dir2_leaf_log_header(tp, bp); |
3c1f9c15 | 889 | lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR); |
1da177e4 LT |
890 | xfs_dir2_leaf_log_ents(tp, bp, index, index); |
891 | /* | |
892 | * Make the data entry free. Keep track of the longest freespace | |
893 | * in the data block in case it changes. | |
894 | */ | |
895 | dbp = dblk->bp; | |
896 | data = dbp->data; | |
897 | dep = (xfs_dir2_data_entry_t *)((char *)data + off); | |
70e73f59 | 898 | longest = be16_to_cpu(data->hdr.bestfree[0].length); |
1da177e4 LT |
899 | needlog = needscan = 0; |
900 | xfs_dir2_data_make_free(tp, dbp, off, | |
bbaaf538 | 901 | xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan); |
1da177e4 LT |
902 | /* |
903 | * Rescan the data block freespaces for bestfree. | |
904 | * Log the data block header if needed. | |
905 | */ | |
906 | if (needscan) | |
ef497f8a | 907 | xfs_dir2_data_freescan(mp, data, &needlog); |
1da177e4 LT |
908 | if (needlog) |
909 | xfs_dir2_data_log_header(tp, dbp); | |
910 | xfs_dir2_data_check(dp, dbp); | |
911 | /* | |
912 | * If the longest data block freespace changes, need to update | |
913 | * the corresponding freeblock entry. | |
914 | */ | |
70e73f59 | 915 | if (longest < be16_to_cpu(data->hdr.bestfree[0].length)) { |
1da177e4 LT |
916 | int error; /* error return value */ |
917 | xfs_dabuf_t *fbp; /* freeblock buffer */ | |
918 | xfs_dir2_db_t fdb; /* freeblock block number */ | |
919 | int findex; /* index in freeblock entries */ | |
920 | xfs_dir2_free_t *free; /* freeblock structure */ | |
921 | int logfree; /* need to log free entry */ | |
922 | ||
923 | /* | |
924 | * Convert the data block number to a free block, | |
925 | * read in the free block. | |
926 | */ | |
bbaaf538 CH |
927 | fdb = xfs_dir2_db_to_fdb(mp, db); |
928 | if ((error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, fdb), | |
1da177e4 LT |
929 | -1, &fbp, XFS_DATA_FORK))) { |
930 | return error; | |
931 | } | |
932 | free = fbp->data; | |
0ba962ef NS |
933 | ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC); |
934 | ASSERT(be32_to_cpu(free->hdr.firstdb) == | |
1da177e4 LT |
935 | XFS_DIR2_MAX_FREE_BESTS(mp) * |
936 | (fdb - XFS_DIR2_FREE_FIRSTDB(mp))); | |
937 | /* | |
938 | * Calculate which entry we need to fix. | |
939 | */ | |
bbaaf538 | 940 | findex = xfs_dir2_db_to_fdindex(mp, db); |
70e73f59 | 941 | longest = be16_to_cpu(data->hdr.bestfree[0].length); |
1da177e4 LT |
942 | /* |
943 | * If the data block is now empty we can get rid of it | |
944 | * (usually). | |
945 | */ | |
946 | if (longest == mp->m_dirblksize - (uint)sizeof(data->hdr)) { | |
947 | /* | |
948 | * Try to punch out the data block. | |
949 | */ | |
950 | error = xfs_dir2_shrink_inode(args, db, dbp); | |
951 | if (error == 0) { | |
952 | dblk->bp = NULL; | |
953 | data = NULL; | |
954 | } | |
955 | /* | |
956 | * We can get ENOSPC if there's no space reservation. | |
957 | * In this case just drop the buffer and some one else | |
958 | * will eventually get rid of the empty block. | |
959 | */ | |
960 | else if (error == ENOSPC && args->total == 0) | |
961 | xfs_da_buf_done(dbp); | |
962 | else | |
963 | return error; | |
964 | } | |
965 | /* | |
966 | * If we got rid of the data block, we can eliminate that entry | |
967 | * in the free block. | |
968 | */ | |
969 | if (data == NULL) { | |
970 | /* | |
971 | * One less used entry in the free table. | |
972 | */ | |
477829ef | 973 | be32_add(&free->hdr.nused, -1); |
1da177e4 LT |
974 | xfs_dir2_free_log_header(tp, fbp); |
975 | /* | |
976 | * If this was the last entry in the table, we can | |
977 | * trim the table size back. There might be other | |
978 | * entries at the end referring to non-existent | |
979 | * data blocks, get those too. | |
980 | */ | |
0ba962ef | 981 | if (findex == be32_to_cpu(free->hdr.nvalid) - 1) { |
1da177e4 LT |
982 | int i; /* free entry index */ |
983 | ||
984 | for (i = findex - 1; | |
0ba962ef | 985 | i >= 0 && be16_to_cpu(free->bests[i]) == NULLDATAOFF; |
1da177e4 LT |
986 | i--) |
987 | continue; | |
0ba962ef | 988 | free->hdr.nvalid = cpu_to_be32(i + 1); |
1da177e4 LT |
989 | logfree = 0; |
990 | } | |
991 | /* | |
992 | * Not the last entry, just punch it out. | |
993 | */ | |
994 | else { | |
0ba962ef | 995 | free->bests[findex] = cpu_to_be16(NULLDATAOFF); |
1da177e4 LT |
996 | logfree = 1; |
997 | } | |
998 | /* | |
999 | * If there are no useful entries left in the block, | |
1000 | * get rid of the block if we can. | |
1001 | */ | |
1002 | if (!free->hdr.nused) { | |
1003 | error = xfs_dir2_shrink_inode(args, fdb, fbp); | |
1004 | if (error == 0) { | |
1005 | fbp = NULL; | |
1006 | logfree = 0; | |
1007 | } else if (error != ENOSPC || args->total != 0) | |
1008 | return error; | |
1009 | /* | |
1010 | * It's possible to get ENOSPC if there is no | |
1011 | * space reservation. In this case some one | |
1012 | * else will eventually get rid of this block. | |
1013 | */ | |
1014 | } | |
1015 | } | |
1016 | /* | |
1017 | * Data block is not empty, just set the free entry to | |
1018 | * the new value. | |
1019 | */ | |
1020 | else { | |
0ba962ef | 1021 | free->bests[findex] = cpu_to_be16(longest); |
1da177e4 LT |
1022 | logfree = 1; |
1023 | } | |
1024 | /* | |
1025 | * Log the free entry that changed, unless we got rid of it. | |
1026 | */ | |
1027 | if (logfree) | |
1028 | xfs_dir2_free_log_bests(tp, fbp, findex, findex); | |
1029 | /* | |
1030 | * Drop the buffer if we still have it. | |
1031 | */ | |
1032 | if (fbp) | |
1033 | xfs_da_buf_done(fbp); | |
1034 | } | |
1035 | xfs_dir2_leafn_check(dp, bp); | |
1036 | /* | |
1037 | * Return indication of whether this leaf block is emtpy enough | |
1038 | * to justify trying to join it with a neighbor. | |
1039 | */ | |
1040 | *rval = | |
1041 | ((uint)sizeof(leaf->hdr) + | |
1042 | (uint)sizeof(leaf->ents[0]) * | |
a818e5de | 1043 | (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale))) < |
1da177e4 LT |
1044 | mp->m_dir_magicpct; |
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * Split the leaf entries in the old block into old and new blocks. | |
1050 | */ | |
1051 | int /* error */ | |
1052 | xfs_dir2_leafn_split( | |
1053 | xfs_da_state_t *state, /* btree cursor */ | |
1054 | xfs_da_state_blk_t *oldblk, /* original block */ | |
1055 | xfs_da_state_blk_t *newblk) /* newly created block */ | |
1056 | { | |
1057 | xfs_da_args_t *args; /* operation arguments */ | |
1058 | xfs_dablk_t blkno; /* new leaf block number */ | |
1059 | int error; /* error return value */ | |
1060 | xfs_mount_t *mp; /* filesystem mount point */ | |
1061 | ||
1062 | /* | |
1063 | * Allocate space for a new leaf node. | |
1064 | */ | |
1065 | args = state->args; | |
1066 | mp = args->dp->i_mount; | |
1067 | ASSERT(args != NULL); | |
1068 | ASSERT(oldblk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1069 | error = xfs_da_grow_inode(args, &blkno); | |
1070 | if (error) { | |
1071 | return error; | |
1072 | } | |
1073 | /* | |
1074 | * Initialize the new leaf block. | |
1075 | */ | |
bbaaf538 | 1076 | error = xfs_dir2_leaf_init(args, xfs_dir2_da_to_db(mp, blkno), |
1da177e4 LT |
1077 | &newblk->bp, XFS_DIR2_LEAFN_MAGIC); |
1078 | if (error) { | |
1079 | return error; | |
1080 | } | |
1081 | newblk->blkno = blkno; | |
1082 | newblk->magic = XFS_DIR2_LEAFN_MAGIC; | |
1083 | /* | |
1084 | * Rebalance the entries across the two leaves, link the new | |
1085 | * block into the leaves. | |
1086 | */ | |
1087 | xfs_dir2_leafn_rebalance(state, oldblk, newblk); | |
1088 | error = xfs_da_blk_link(state, oldblk, newblk); | |
1089 | if (error) { | |
1090 | return error; | |
1091 | } | |
1092 | /* | |
1093 | * Insert the new entry in the correct block. | |
1094 | */ | |
1095 | if (state->inleaf) | |
1096 | error = xfs_dir2_leafn_add(oldblk->bp, args, oldblk->index); | |
1097 | else | |
1098 | error = xfs_dir2_leafn_add(newblk->bp, args, newblk->index); | |
1099 | /* | |
1100 | * Update last hashval in each block since we added the name. | |
1101 | */ | |
1102 | oldblk->hashval = xfs_dir2_leafn_lasthash(oldblk->bp, NULL); | |
1103 | newblk->hashval = xfs_dir2_leafn_lasthash(newblk->bp, NULL); | |
1104 | xfs_dir2_leafn_check(args->dp, oldblk->bp); | |
1105 | xfs_dir2_leafn_check(args->dp, newblk->bp); | |
1106 | return error; | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * Check a leaf block and its neighbors to see if the block should be | |
1111 | * collapsed into one or the other neighbor. Always keep the block | |
1112 | * with the smaller block number. | |
1113 | * If the current block is over 50% full, don't try to join it, return 0. | |
1114 | * If the block is empty, fill in the state structure and return 2. | |
1115 | * If it can be collapsed, fill in the state structure and return 1. | |
1116 | * If nothing can be done, return 0. | |
1117 | */ | |
1118 | int /* error */ | |
1119 | xfs_dir2_leafn_toosmall( | |
1120 | xfs_da_state_t *state, /* btree cursor */ | |
1121 | int *action) /* resulting action to take */ | |
1122 | { | |
1123 | xfs_da_state_blk_t *blk; /* leaf block */ | |
1124 | xfs_dablk_t blkno; /* leaf block number */ | |
1125 | xfs_dabuf_t *bp; /* leaf buffer */ | |
1126 | int bytes; /* bytes in use */ | |
1127 | int count; /* leaf live entry count */ | |
1128 | int error; /* error return value */ | |
1129 | int forward; /* sibling block direction */ | |
1130 | int i; /* sibling counter */ | |
1131 | xfs_da_blkinfo_t *info; /* leaf block header */ | |
1132 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1133 | int rval; /* result from path_shift */ | |
1134 | ||
1135 | /* | |
1136 | * Check for the degenerate case of the block being over 50% full. | |
1137 | * If so, it's not worth even looking to see if we might be able | |
1138 | * to coalesce with a sibling. | |
1139 | */ | |
1140 | blk = &state->path.blk[state->path.active - 1]; | |
1141 | info = blk->bp->data; | |
89da0544 | 1142 | ASSERT(be16_to_cpu(info->magic) == XFS_DIR2_LEAFN_MAGIC); |
1da177e4 | 1143 | leaf = (xfs_dir2_leaf_t *)info; |
a818e5de | 1144 | count = be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); |
1da177e4 LT |
1145 | bytes = (uint)sizeof(leaf->hdr) + count * (uint)sizeof(leaf->ents[0]); |
1146 | if (bytes > (state->blocksize >> 1)) { | |
1147 | /* | |
1148 | * Blk over 50%, don't try to join. | |
1149 | */ | |
1150 | *action = 0; | |
1151 | return 0; | |
1152 | } | |
1153 | /* | |
1154 | * Check for the degenerate case of the block being empty. | |
1155 | * If the block is empty, we'll simply delete it, no need to | |
1156 | * coalesce it with a sibling block. We choose (arbitrarily) | |
1157 | * to merge with the forward block unless it is NULL. | |
1158 | */ | |
1159 | if (count == 0) { | |
1160 | /* | |
1161 | * Make altpath point to the block we want to keep and | |
1162 | * path point to the block we want to drop (this one). | |
1163 | */ | |
89da0544 | 1164 | forward = (info->forw != 0); |
1da177e4 LT |
1165 | memcpy(&state->altpath, &state->path, sizeof(state->path)); |
1166 | error = xfs_da_path_shift(state, &state->altpath, forward, 0, | |
1167 | &rval); | |
1168 | if (error) | |
1169 | return error; | |
1170 | *action = rval ? 2 : 0; | |
1171 | return 0; | |
1172 | } | |
1173 | /* | |
1174 | * Examine each sibling block to see if we can coalesce with | |
1175 | * at least 25% free space to spare. We need to figure out | |
1176 | * whether to merge with the forward or the backward block. | |
1177 | * We prefer coalescing with the lower numbered sibling so as | |
1178 | * to shrink a directory over time. | |
1179 | */ | |
89da0544 | 1180 | forward = be32_to_cpu(info->forw) < be32_to_cpu(info->back); |
1da177e4 | 1181 | for (i = 0, bp = NULL; i < 2; forward = !forward, i++) { |
89da0544 | 1182 | blkno = forward ? be32_to_cpu(info->forw) : be32_to_cpu(info->back); |
1da177e4 LT |
1183 | if (blkno == 0) |
1184 | continue; | |
1185 | /* | |
1186 | * Read the sibling leaf block. | |
1187 | */ | |
1188 | if ((error = | |
1189 | xfs_da_read_buf(state->args->trans, state->args->dp, blkno, | |
1190 | -1, &bp, XFS_DATA_FORK))) { | |
1191 | return error; | |
1192 | } | |
1193 | ASSERT(bp != NULL); | |
1194 | /* | |
1195 | * Count bytes in the two blocks combined. | |
1196 | */ | |
1197 | leaf = (xfs_dir2_leaf_t *)info; | |
a818e5de | 1198 | count = be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); |
1da177e4 LT |
1199 | bytes = state->blocksize - (state->blocksize >> 2); |
1200 | leaf = bp->data; | |
89da0544 | 1201 | ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); |
a818e5de | 1202 | count += be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); |
1da177e4 LT |
1203 | bytes -= count * (uint)sizeof(leaf->ents[0]); |
1204 | /* | |
1205 | * Fits with at least 25% to spare. | |
1206 | */ | |
1207 | if (bytes >= 0) | |
1208 | break; | |
1209 | xfs_da_brelse(state->args->trans, bp); | |
1210 | } | |
1211 | /* | |
1212 | * Didn't like either block, give up. | |
1213 | */ | |
1214 | if (i >= 2) { | |
1215 | *action = 0; | |
1216 | return 0; | |
1217 | } | |
1218 | /* | |
1219 | * Done with the sibling leaf block here, drop the dabuf | |
1220 | * so path_shift can get it. | |
1221 | */ | |
1222 | xfs_da_buf_done(bp); | |
1223 | /* | |
1224 | * Make altpath point to the block we want to keep (the lower | |
1225 | * numbered block) and path point to the block we want to drop. | |
1226 | */ | |
1227 | memcpy(&state->altpath, &state->path, sizeof(state->path)); | |
1228 | if (blkno < blk->blkno) | |
1229 | error = xfs_da_path_shift(state, &state->altpath, forward, 0, | |
1230 | &rval); | |
1231 | else | |
1232 | error = xfs_da_path_shift(state, &state->path, forward, 0, | |
1233 | &rval); | |
1234 | if (error) { | |
1235 | return error; | |
1236 | } | |
1237 | *action = rval ? 0 : 1; | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Move all the leaf entries from drop_blk to save_blk. | |
1243 | * This is done as part of a join operation. | |
1244 | */ | |
1245 | void | |
1246 | xfs_dir2_leafn_unbalance( | |
1247 | xfs_da_state_t *state, /* cursor */ | |
1248 | xfs_da_state_blk_t *drop_blk, /* dead block */ | |
1249 | xfs_da_state_blk_t *save_blk) /* surviving block */ | |
1250 | { | |
1251 | xfs_da_args_t *args; /* operation arguments */ | |
1252 | xfs_dir2_leaf_t *drop_leaf; /* dead leaf structure */ | |
1253 | xfs_dir2_leaf_t *save_leaf; /* surviving leaf structure */ | |
1254 | ||
1255 | args = state->args; | |
1256 | ASSERT(drop_blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1257 | ASSERT(save_blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1258 | drop_leaf = drop_blk->bp->data; | |
1259 | save_leaf = save_blk->bp->data; | |
89da0544 NS |
1260 | ASSERT(be16_to_cpu(drop_leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); |
1261 | ASSERT(be16_to_cpu(save_leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC); | |
1da177e4 LT |
1262 | /* |
1263 | * If there are any stale leaf entries, take this opportunity | |
1264 | * to purge them. | |
1265 | */ | |
a818e5de | 1266 | if (drop_leaf->hdr.stale) |
1da177e4 | 1267 | xfs_dir2_leaf_compact(args, drop_blk->bp); |
a818e5de | 1268 | if (save_leaf->hdr.stale) |
1da177e4 LT |
1269 | xfs_dir2_leaf_compact(args, save_blk->bp); |
1270 | /* | |
1271 | * Move the entries from drop to the appropriate end of save. | |
1272 | */ | |
3c1f9c15 | 1273 | drop_blk->hashval = be32_to_cpu(drop_leaf->ents[be16_to_cpu(drop_leaf->hdr.count) - 1].hashval); |
1da177e4 LT |
1274 | if (xfs_dir2_leafn_order(save_blk->bp, drop_blk->bp)) |
1275 | xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, 0, | |
a818e5de | 1276 | be16_to_cpu(drop_leaf->hdr.count)); |
1da177e4 LT |
1277 | else |
1278 | xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, | |
a818e5de | 1279 | be16_to_cpu(save_leaf->hdr.count), be16_to_cpu(drop_leaf->hdr.count)); |
3c1f9c15 | 1280 | save_blk->hashval = be32_to_cpu(save_leaf->ents[be16_to_cpu(save_leaf->hdr.count) - 1].hashval); |
1da177e4 LT |
1281 | xfs_dir2_leafn_check(args->dp, save_blk->bp); |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * Top-level node form directory addname routine. | |
1286 | */ | |
1287 | int /* error */ | |
1288 | xfs_dir2_node_addname( | |
1289 | xfs_da_args_t *args) /* operation arguments */ | |
1290 | { | |
1291 | xfs_da_state_blk_t *blk; /* leaf block for insert */ | |
1292 | int error; /* error return value */ | |
1293 | int rval; /* sub-return value */ | |
1294 | xfs_da_state_t *state; /* btree cursor */ | |
1295 | ||
1296 | xfs_dir2_trace_args("node_addname", args); | |
1297 | /* | |
1298 | * Allocate and initialize the state (btree cursor). | |
1299 | */ | |
1300 | state = xfs_da_state_alloc(); | |
1301 | state->args = args; | |
1302 | state->mp = args->dp->i_mount; | |
1303 | state->blocksize = state->mp->m_dirblksize; | |
1304 | state->node_ents = state->mp->m_dir_node_ents; | |
1305 | /* | |
1306 | * Look up the name. We're not supposed to find it, but | |
1307 | * this gives us the insertion point. | |
1308 | */ | |
1309 | error = xfs_da_node_lookup_int(state, &rval); | |
1310 | if (error) | |
1311 | rval = error; | |
1312 | if (rval != ENOENT) { | |
1313 | goto done; | |
1314 | } | |
1315 | /* | |
1316 | * Add the data entry to a data block. | |
1317 | * Extravalid is set to a freeblock found by lookup. | |
1318 | */ | |
1319 | rval = xfs_dir2_node_addname_int(args, | |
1320 | state->extravalid ? &state->extrablk : NULL); | |
1321 | if (rval) { | |
1322 | goto done; | |
1323 | } | |
1324 | blk = &state->path.blk[state->path.active - 1]; | |
1325 | ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1326 | /* | |
1327 | * Add the new leaf entry. | |
1328 | */ | |
1329 | rval = xfs_dir2_leafn_add(blk->bp, args, blk->index); | |
1330 | if (rval == 0) { | |
1331 | /* | |
1332 | * It worked, fix the hash values up the btree. | |
1333 | */ | |
1334 | if (!args->justcheck) | |
1335 | xfs_da_fixhashpath(state, &state->path); | |
1336 | } else { | |
1337 | /* | |
1338 | * It didn't work, we need to split the leaf block. | |
1339 | */ | |
1340 | if (args->total == 0) { | |
1341 | ASSERT(rval == ENOSPC); | |
1342 | goto done; | |
1343 | } | |
1344 | /* | |
1345 | * Split the leaf block and insert the new entry. | |
1346 | */ | |
1347 | rval = xfs_da_split(state); | |
1348 | } | |
1349 | done: | |
1350 | xfs_da_state_free(state); | |
1351 | return rval; | |
1352 | } | |
1353 | ||
1354 | /* | |
1355 | * Add the data entry for a node-format directory name addition. | |
1356 | * The leaf entry is added in xfs_dir2_leafn_add. | |
1357 | * We may enter with a freespace block that the lookup found. | |
1358 | */ | |
1359 | static int /* error */ | |
1360 | xfs_dir2_node_addname_int( | |
1361 | xfs_da_args_t *args, /* operation arguments */ | |
1362 | xfs_da_state_blk_t *fblk) /* optional freespace block */ | |
1363 | { | |
1364 | xfs_dir2_data_t *data; /* data block structure */ | |
1365 | xfs_dir2_db_t dbno; /* data block number */ | |
1366 | xfs_dabuf_t *dbp; /* data block buffer */ | |
1367 | xfs_dir2_data_entry_t *dep; /* data entry pointer */ | |
1368 | xfs_inode_t *dp; /* incore directory inode */ | |
1369 | xfs_dir2_data_unused_t *dup; /* data unused entry pointer */ | |
1370 | int error; /* error return value */ | |
1371 | xfs_dir2_db_t fbno; /* freespace block number */ | |
1372 | xfs_dabuf_t *fbp; /* freespace buffer */ | |
1373 | int findex; /* freespace entry index */ | |
1374 | xfs_dir2_free_t *free=NULL; /* freespace block structure */ | |
1375 | xfs_dir2_db_t ifbno; /* initial freespace block no */ | |
1376 | xfs_dir2_db_t lastfbno=0; /* highest freespace block no */ | |
1377 | int length; /* length of the new entry */ | |
1378 | int logfree; /* need to log free entry */ | |
1379 | xfs_mount_t *mp; /* filesystem mount point */ | |
1380 | int needlog; /* need to log data header */ | |
1381 | int needscan; /* need to rescan data frees */ | |
3d693c6e | 1382 | __be16 *tagp; /* data entry tag pointer */ |
1da177e4 LT |
1383 | xfs_trans_t *tp; /* transaction pointer */ |
1384 | ||
1385 | dp = args->dp; | |
1386 | mp = dp->i_mount; | |
1387 | tp = args->trans; | |
bbaaf538 | 1388 | length = xfs_dir2_data_entsize(args->namelen); |
1da177e4 LT |
1389 | /* |
1390 | * If we came in with a freespace block that means that lookup | |
1391 | * found an entry with our hash value. This is the freespace | |
1392 | * block for that data entry. | |
1393 | */ | |
1394 | if (fblk) { | |
1395 | fbp = fblk->bp; | |
1396 | /* | |
1397 | * Remember initial freespace block number. | |
1398 | */ | |
1399 | ifbno = fblk->blkno; | |
1400 | free = fbp->data; | |
0ba962ef | 1401 | ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC); |
1da177e4 LT |
1402 | findex = fblk->index; |
1403 | /* | |
1404 | * This means the free entry showed that the data block had | |
1405 | * space for our entry, so we remembered it. | |
1406 | * Use that data block. | |
1407 | */ | |
1408 | if (findex >= 0) { | |
0ba962ef NS |
1409 | ASSERT(findex < be32_to_cpu(free->hdr.nvalid)); |
1410 | ASSERT(be16_to_cpu(free->bests[findex]) != NULLDATAOFF); | |
1411 | ASSERT(be16_to_cpu(free->bests[findex]) >= length); | |
1412 | dbno = be32_to_cpu(free->hdr.firstdb) + findex; | |
1da177e4 LT |
1413 | } |
1414 | /* | |
1415 | * The data block looked at didn't have enough room. | |
1416 | * We'll start at the beginning of the freespace entries. | |
1417 | */ | |
1418 | else { | |
1419 | dbno = -1; | |
1420 | findex = 0; | |
1421 | } | |
1422 | } | |
1423 | /* | |
1424 | * Didn't come in with a freespace block, so don't have a data block. | |
1425 | */ | |
1426 | else { | |
1427 | ifbno = dbno = -1; | |
1428 | fbp = NULL; | |
1429 | findex = 0; | |
1430 | } | |
1431 | /* | |
1432 | * If we don't have a data block yet, we're going to scan the | |
1433 | * freespace blocks looking for one. Figure out what the | |
1434 | * highest freespace block number is. | |
1435 | */ | |
1436 | if (dbno == -1) { | |
1437 | xfs_fileoff_t fo; /* freespace block number */ | |
1438 | ||
1439 | if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) | |
1440 | return error; | |
bbaaf538 | 1441 | lastfbno = xfs_dir2_da_to_db(mp, (xfs_dablk_t)fo); |
1da177e4 LT |
1442 | fbno = ifbno; |
1443 | } | |
1444 | /* | |
1445 | * While we haven't identified a data block, search the freeblock | |
1446 | * data for a good data block. If we find a null freeblock entry, | |
1447 | * indicating a hole in the data blocks, remember that. | |
1448 | */ | |
1449 | while (dbno == -1) { | |
1450 | /* | |
1451 | * If we don't have a freeblock in hand, get the next one. | |
1452 | */ | |
1453 | if (fbp == NULL) { | |
1454 | /* | |
1455 | * Happens the first time through unless lookup gave | |
1456 | * us a freespace block to start with. | |
1457 | */ | |
1458 | if (++fbno == 0) | |
1459 | fbno = XFS_DIR2_FREE_FIRSTDB(mp); | |
1460 | /* | |
1461 | * If it's ifbno we already looked at it. | |
1462 | */ | |
1463 | if (fbno == ifbno) | |
1464 | fbno++; | |
1465 | /* | |
1466 | * If it's off the end we're done. | |
1467 | */ | |
1468 | if (fbno >= lastfbno) | |
1469 | break; | |
1470 | /* | |
1471 | * Read the block. There can be holes in the | |
1472 | * freespace blocks, so this might not succeed. | |
1473 | * This should be really rare, so there's no reason | |
1474 | * to avoid it. | |
1475 | */ | |
1476 | if ((error = xfs_da_read_buf(tp, dp, | |
bbaaf538 | 1477 | xfs_dir2_db_to_da(mp, fbno), -2, &fbp, |
1da177e4 LT |
1478 | XFS_DATA_FORK))) { |
1479 | return error; | |
1480 | } | |
1481 | if (unlikely(fbp == NULL)) { | |
1482 | continue; | |
1483 | } | |
1484 | free = fbp->data; | |
0ba962ef | 1485 | ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC); |
1da177e4 LT |
1486 | findex = 0; |
1487 | } | |
1488 | /* | |
1489 | * Look at the current free entry. Is it good enough? | |
1490 | */ | |
0ba962ef NS |
1491 | if (be16_to_cpu(free->bests[findex]) != NULLDATAOFF && |
1492 | be16_to_cpu(free->bests[findex]) >= length) | |
1493 | dbno = be32_to_cpu(free->hdr.firstdb) + findex; | |
1da177e4 LT |
1494 | else { |
1495 | /* | |
1496 | * Are we done with the freeblock? | |
1497 | */ | |
0ba962ef | 1498 | if (++findex == be32_to_cpu(free->hdr.nvalid)) { |
1da177e4 LT |
1499 | /* |
1500 | * Drop the block. | |
1501 | */ | |
1502 | xfs_da_brelse(tp, fbp); | |
1503 | fbp = NULL; | |
1504 | if (fblk && fblk->bp) | |
1505 | fblk->bp = NULL; | |
1506 | } | |
1507 | } | |
1508 | } | |
1509 | /* | |
1510 | * If we don't have a data block, we need to allocate one and make | |
1511 | * the freespace entries refer to it. | |
1512 | */ | |
1513 | if (unlikely(dbno == -1)) { | |
1514 | /* | |
1515 | * Not allowed to allocate, return failure. | |
1516 | */ | |
1517 | if (args->justcheck || args->total == 0) { | |
1518 | /* | |
1519 | * Drop the freespace buffer unless it came from our | |
1520 | * caller. | |
1521 | */ | |
1522 | if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) | |
1523 | xfs_da_buf_done(fbp); | |
1524 | return XFS_ERROR(ENOSPC); | |
1525 | } | |
1526 | /* | |
1527 | * Allocate and initialize the new data block. | |
1528 | */ | |
1529 | if (unlikely((error = xfs_dir2_grow_inode(args, | |
1530 | XFS_DIR2_DATA_SPACE, | |
1531 | &dbno)) || | |
1532 | (error = xfs_dir2_data_init(args, dbno, &dbp)))) { | |
1533 | /* | |
1534 | * Drop the freespace buffer unless it came from our | |
1535 | * caller. | |
1536 | */ | |
1537 | if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) | |
1538 | xfs_da_buf_done(fbp); | |
1539 | return error; | |
1540 | } | |
1541 | /* | |
1542 | * If (somehow) we have a freespace block, get rid of it. | |
1543 | */ | |
1544 | if (fbp) | |
1545 | xfs_da_brelse(tp, fbp); | |
1546 | if (fblk && fblk->bp) | |
1547 | fblk->bp = NULL; | |
1548 | ||
1549 | /* | |
1550 | * Get the freespace block corresponding to the data block | |
1551 | * that was just allocated. | |
1552 | */ | |
bbaaf538 | 1553 | fbno = xfs_dir2_db_to_fdb(mp, dbno); |
1da177e4 | 1554 | if (unlikely(error = xfs_da_read_buf(tp, dp, |
bbaaf538 | 1555 | xfs_dir2_db_to_da(mp, fbno), -2, &fbp, |
1da177e4 LT |
1556 | XFS_DATA_FORK))) { |
1557 | xfs_da_buf_done(dbp); | |
1558 | return error; | |
1559 | } | |
1560 | /* | |
1561 | * If there wasn't a freespace block, the read will | |
1562 | * return a NULL fbp. Allocate and initialize a new one. | |
1563 | */ | |
1564 | if( fbp == NULL ) { | |
1565 | if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, | |
1566 | &fbno))) { | |
1567 | return error; | |
1568 | } | |
1569 | ||
bbaaf538 | 1570 | if (unlikely(xfs_dir2_db_to_fdb(mp, dbno) != fbno)) { |
1da177e4 LT |
1571 | cmn_err(CE_ALERT, |
1572 | "xfs_dir2_node_addname_int: dir ino " | |
1573 | "%llu needed freesp block %lld for\n" | |
1574 | " data block %lld, got %lld\n" | |
1575 | " ifbno %llu lastfbno %d\n", | |
1576 | (unsigned long long)dp->i_ino, | |
bbaaf538 | 1577 | (long long)xfs_dir2_db_to_fdb(mp, dbno), |
1da177e4 LT |
1578 | (long long)dbno, (long long)fbno, |
1579 | (unsigned long long)ifbno, lastfbno); | |
1580 | if (fblk) { | |
1581 | cmn_err(CE_ALERT, | |
1582 | " fblk 0x%p blkno %llu " | |
1583 | "index %d magic 0x%x\n", | |
1584 | fblk, | |
1585 | (unsigned long long)fblk->blkno, | |
1586 | fblk->index, | |
1587 | fblk->magic); | |
1588 | } else { | |
1589 | cmn_err(CE_ALERT, | |
1590 | " ... fblk is NULL\n"); | |
1591 | } | |
1592 | XFS_ERROR_REPORT("xfs_dir2_node_addname_int", | |
1593 | XFS_ERRLEVEL_LOW, mp); | |
1594 | return XFS_ERROR(EFSCORRUPTED); | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * Get a buffer for the new block. | |
1599 | */ | |
1600 | if ((error = xfs_da_get_buf(tp, dp, | |
bbaaf538 | 1601 | xfs_dir2_db_to_da(mp, fbno), |
1da177e4 LT |
1602 | -1, &fbp, XFS_DATA_FORK))) { |
1603 | return error; | |
1604 | } | |
1605 | ASSERT(fbp != NULL); | |
1606 | ||
1607 | /* | |
1608 | * Initialize the new block to be empty, and remember | |
1609 | * its first slot as our empty slot. | |
1610 | */ | |
1611 | free = fbp->data; | |
0ba962ef NS |
1612 | free->hdr.magic = cpu_to_be32(XFS_DIR2_FREE_MAGIC); |
1613 | free->hdr.firstdb = cpu_to_be32( | |
1da177e4 LT |
1614 | (fbno - XFS_DIR2_FREE_FIRSTDB(mp)) * |
1615 | XFS_DIR2_MAX_FREE_BESTS(mp)); | |
1616 | free->hdr.nvalid = 0; | |
1617 | free->hdr.nused = 0; | |
1618 | } else { | |
1619 | free = fbp->data; | |
0ba962ef | 1620 | ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC); |
1da177e4 LT |
1621 | } |
1622 | ||
1623 | /* | |
1624 | * Set the freespace block index from the data block number. | |
1625 | */ | |
bbaaf538 | 1626 | findex = xfs_dir2_db_to_fdindex(mp, dbno); |
1da177e4 LT |
1627 | /* |
1628 | * If it's after the end of the current entries in the | |
1629 | * freespace block, extend that table. | |
1630 | */ | |
0ba962ef | 1631 | if (findex >= be32_to_cpu(free->hdr.nvalid)) { |
1da177e4 | 1632 | ASSERT(findex < XFS_DIR2_MAX_FREE_BESTS(mp)); |
0ba962ef | 1633 | free->hdr.nvalid = cpu_to_be32(findex + 1); |
1da177e4 LT |
1634 | /* |
1635 | * Tag new entry so nused will go up. | |
1636 | */ | |
0ba962ef | 1637 | free->bests[findex] = cpu_to_be16(NULLDATAOFF); |
1da177e4 LT |
1638 | } |
1639 | /* | |
1640 | * If this entry was for an empty data block | |
1641 | * (this should always be true) then update the header. | |
1642 | */ | |
0ba962ef NS |
1643 | if (be16_to_cpu(free->bests[findex]) == NULLDATAOFF) { |
1644 | be32_add(&free->hdr.nused, 1); | |
1da177e4 LT |
1645 | xfs_dir2_free_log_header(tp, fbp); |
1646 | } | |
1647 | /* | |
1648 | * Update the real value in the table. | |
1649 | * We haven't allocated the data entry yet so this will | |
1650 | * change again. | |
1651 | */ | |
1652 | data = dbp->data; | |
70e73f59 | 1653 | free->bests[findex] = data->hdr.bestfree[0].length; |
1da177e4 LT |
1654 | logfree = 1; |
1655 | } | |
1656 | /* | |
1657 | * We had a data block so we don't have to make a new one. | |
1658 | */ | |
1659 | else { | |
1660 | /* | |
1661 | * If just checking, we succeeded. | |
1662 | */ | |
1663 | if (args->justcheck) { | |
1664 | if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) | |
1665 | xfs_da_buf_done(fbp); | |
1666 | return 0; | |
1667 | } | |
1668 | /* | |
1669 | * Read the data block in. | |
1670 | */ | |
1671 | if (unlikely( | |
bbaaf538 | 1672 | error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, dbno), |
1da177e4 LT |
1673 | -1, &dbp, XFS_DATA_FORK))) { |
1674 | if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) | |
1675 | xfs_da_buf_done(fbp); | |
1676 | return error; | |
1677 | } | |
1678 | data = dbp->data; | |
1679 | logfree = 0; | |
1680 | } | |
70e73f59 | 1681 | ASSERT(be16_to_cpu(data->hdr.bestfree[0].length) >= length); |
1da177e4 LT |
1682 | /* |
1683 | * Point to the existing unused space. | |
1684 | */ | |
1685 | dup = (xfs_dir2_data_unused_t *) | |
70e73f59 | 1686 | ((char *)data + be16_to_cpu(data->hdr.bestfree[0].offset)); |
1da177e4 LT |
1687 | needscan = needlog = 0; |
1688 | /* | |
1689 | * Mark the first part of the unused space, inuse for us. | |
1690 | */ | |
1691 | xfs_dir2_data_use_free(tp, dbp, dup, | |
1692 | (xfs_dir2_data_aoff_t)((char *)dup - (char *)data), length, | |
1693 | &needlog, &needscan); | |
1694 | /* | |
1695 | * Fill in the new entry and log it. | |
1696 | */ | |
1697 | dep = (xfs_dir2_data_entry_t *)dup; | |
ff9901c1 | 1698 | dep->inumber = cpu_to_be64(args->inumber); |
1da177e4 LT |
1699 | dep->namelen = args->namelen; |
1700 | memcpy(dep->name, args->name, dep->namelen); | |
bbaaf538 | 1701 | tagp = xfs_dir2_data_entry_tag_p(dep); |
3d693c6e | 1702 | *tagp = cpu_to_be16((char *)dep - (char *)data); |
1da177e4 LT |
1703 | xfs_dir2_data_log_entry(tp, dbp, dep); |
1704 | /* | |
1705 | * Rescan the block for bestfree if needed. | |
1706 | */ | |
1707 | if (needscan) | |
ef497f8a | 1708 | xfs_dir2_data_freescan(mp, data, &needlog); |
1da177e4 LT |
1709 | /* |
1710 | * Log the data block header if needed. | |
1711 | */ | |
1712 | if (needlog) | |
1713 | xfs_dir2_data_log_header(tp, dbp); | |
1714 | /* | |
1715 | * If the freespace entry is now wrong, update it. | |
1716 | */ | |
0ba962ef | 1717 | if (be16_to_cpu(free->bests[findex]) != be16_to_cpu(data->hdr.bestfree[0].length)) { |
70e73f59 | 1718 | free->bests[findex] = data->hdr.bestfree[0].length; |
1da177e4 LT |
1719 | logfree = 1; |
1720 | } | |
1721 | /* | |
1722 | * Log the freespace entry if needed. | |
1723 | */ | |
1724 | if (logfree) | |
1725 | xfs_dir2_free_log_bests(tp, fbp, findex, findex); | |
1726 | /* | |
1727 | * If the caller didn't hand us the freespace block, drop it. | |
1728 | */ | |
1729 | if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) | |
1730 | xfs_da_buf_done(fbp); | |
1731 | /* | |
1732 | * Return the data block and offset in args, then drop the data block. | |
1733 | */ | |
1734 | args->blkno = (xfs_dablk_t)dbno; | |
3d693c6e | 1735 | args->index = be16_to_cpu(*tagp); |
1da177e4 LT |
1736 | xfs_da_buf_done(dbp); |
1737 | return 0; | |
1738 | } | |
1739 | ||
1740 | /* | |
1741 | * Lookup an entry in a node-format directory. | |
1742 | * All the real work happens in xfs_da_node_lookup_int. | |
1743 | * The only real output is the inode number of the entry. | |
1744 | */ | |
1745 | int /* error */ | |
1746 | xfs_dir2_node_lookup( | |
1747 | xfs_da_args_t *args) /* operation arguments */ | |
1748 | { | |
1749 | int error; /* error return value */ | |
1750 | int i; /* btree level */ | |
1751 | int rval; /* operation return value */ | |
1752 | xfs_da_state_t *state; /* btree cursor */ | |
1753 | ||
1754 | xfs_dir2_trace_args("node_lookup", args); | |
1755 | /* | |
1756 | * Allocate and initialize the btree cursor. | |
1757 | */ | |
1758 | state = xfs_da_state_alloc(); | |
1759 | state->args = args; | |
1760 | state->mp = args->dp->i_mount; | |
1761 | state->blocksize = state->mp->m_dirblksize; | |
1762 | state->node_ents = state->mp->m_dir_node_ents; | |
1763 | /* | |
1764 | * Fill in the path to the entry in the cursor. | |
1765 | */ | |
1766 | error = xfs_da_node_lookup_int(state, &rval); | |
1767 | if (error) | |
1768 | rval = error; | |
1769 | /* | |
1770 | * Release the btree blocks and leaf block. | |
1771 | */ | |
1772 | for (i = 0; i < state->path.active; i++) { | |
1773 | xfs_da_brelse(args->trans, state->path.blk[i].bp); | |
1774 | state->path.blk[i].bp = NULL; | |
1775 | } | |
1776 | /* | |
1777 | * Release the data block if we have it. | |
1778 | */ | |
1779 | if (state->extravalid && state->extrablk.bp) { | |
1780 | xfs_da_brelse(args->trans, state->extrablk.bp); | |
1781 | state->extrablk.bp = NULL; | |
1782 | } | |
1783 | xfs_da_state_free(state); | |
1784 | return rval; | |
1785 | } | |
1786 | ||
1787 | /* | |
1788 | * Remove an entry from a node-format directory. | |
1789 | */ | |
1790 | int /* error */ | |
1791 | xfs_dir2_node_removename( | |
1792 | xfs_da_args_t *args) /* operation arguments */ | |
1793 | { | |
1794 | xfs_da_state_blk_t *blk; /* leaf block */ | |
1795 | int error; /* error return value */ | |
1796 | int rval; /* operation return value */ | |
1797 | xfs_da_state_t *state; /* btree cursor */ | |
1798 | ||
1799 | xfs_dir2_trace_args("node_removename", args); | |
1800 | /* | |
1801 | * Allocate and initialize the btree cursor. | |
1802 | */ | |
1803 | state = xfs_da_state_alloc(); | |
1804 | state->args = args; | |
1805 | state->mp = args->dp->i_mount; | |
1806 | state->blocksize = state->mp->m_dirblksize; | |
1807 | state->node_ents = state->mp->m_dir_node_ents; | |
1808 | /* | |
1809 | * Look up the entry we're deleting, set up the cursor. | |
1810 | */ | |
1811 | error = xfs_da_node_lookup_int(state, &rval); | |
1812 | if (error) { | |
1813 | rval = error; | |
1814 | } | |
1815 | /* | |
1816 | * Didn't find it, upper layer screwed up. | |
1817 | */ | |
1818 | if (rval != EEXIST) { | |
1819 | xfs_da_state_free(state); | |
1820 | return rval; | |
1821 | } | |
1822 | blk = &state->path.blk[state->path.active - 1]; | |
1823 | ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1824 | ASSERT(state->extravalid); | |
1825 | /* | |
1826 | * Remove the leaf and data entries. | |
1827 | * Extrablk refers to the data block. | |
1828 | */ | |
1829 | error = xfs_dir2_leafn_remove(args, blk->bp, blk->index, | |
1830 | &state->extrablk, &rval); | |
1831 | if (error) { | |
1832 | return error; | |
1833 | } | |
1834 | /* | |
1835 | * Fix the hash values up the btree. | |
1836 | */ | |
1837 | xfs_da_fixhashpath(state, &state->path); | |
1838 | /* | |
1839 | * If we need to join leaf blocks, do it. | |
1840 | */ | |
1841 | if (rval && state->path.active > 1) | |
1842 | error = xfs_da_join(state); | |
1843 | /* | |
1844 | * If no errors so far, try conversion to leaf format. | |
1845 | */ | |
1846 | if (!error) | |
1847 | error = xfs_dir2_node_to_leaf(state); | |
1848 | xfs_da_state_free(state); | |
1849 | return error; | |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * Replace an entry's inode number in a node-format directory. | |
1854 | */ | |
1855 | int /* error */ | |
1856 | xfs_dir2_node_replace( | |
1857 | xfs_da_args_t *args) /* operation arguments */ | |
1858 | { | |
1859 | xfs_da_state_blk_t *blk; /* leaf block */ | |
1860 | xfs_dir2_data_t *data; /* data block structure */ | |
1861 | xfs_dir2_data_entry_t *dep; /* data entry changed */ | |
1862 | int error; /* error return value */ | |
1863 | int i; /* btree level */ | |
1864 | xfs_ino_t inum; /* new inode number */ | |
1865 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1866 | xfs_dir2_leaf_entry_t *lep; /* leaf entry being changed */ | |
1867 | int rval; /* internal return value */ | |
1868 | xfs_da_state_t *state; /* btree cursor */ | |
1869 | ||
1870 | xfs_dir2_trace_args("node_replace", args); | |
1871 | /* | |
1872 | * Allocate and initialize the btree cursor. | |
1873 | */ | |
1874 | state = xfs_da_state_alloc(); | |
1875 | state->args = args; | |
1876 | state->mp = args->dp->i_mount; | |
1877 | state->blocksize = state->mp->m_dirblksize; | |
1878 | state->node_ents = state->mp->m_dir_node_ents; | |
1879 | inum = args->inumber; | |
1880 | /* | |
1881 | * Lookup the entry to change in the btree. | |
1882 | */ | |
1883 | error = xfs_da_node_lookup_int(state, &rval); | |
1884 | if (error) { | |
1885 | rval = error; | |
1886 | } | |
1887 | /* | |
1888 | * It should be found, since the vnodeops layer has looked it up | |
1889 | * and locked it. But paranoia is good. | |
1890 | */ | |
1891 | if (rval == EEXIST) { | |
1892 | /* | |
1893 | * Find the leaf entry. | |
1894 | */ | |
1895 | blk = &state->path.blk[state->path.active - 1]; | |
1896 | ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1897 | leaf = blk->bp->data; | |
1898 | lep = &leaf->ents[blk->index]; | |
1899 | ASSERT(state->extravalid); | |
1900 | /* | |
1901 | * Point to the data entry. | |
1902 | */ | |
1903 | data = state->extrablk.bp->data; | |
70e73f59 | 1904 | ASSERT(be32_to_cpu(data->hdr.magic) == XFS_DIR2_DATA_MAGIC); |
1da177e4 LT |
1905 | dep = (xfs_dir2_data_entry_t *) |
1906 | ((char *)data + | |
bbaaf538 | 1907 | xfs_dir2_dataptr_to_off(state->mp, be32_to_cpu(lep->address))); |
ff9901c1 | 1908 | ASSERT(inum != be64_to_cpu(dep->inumber)); |
1da177e4 LT |
1909 | /* |
1910 | * Fill in the new inode number and log the entry. | |
1911 | */ | |
ff9901c1 | 1912 | dep->inumber = cpu_to_be64(inum); |
1da177e4 LT |
1913 | xfs_dir2_data_log_entry(args->trans, state->extrablk.bp, dep); |
1914 | rval = 0; | |
1915 | } | |
1916 | /* | |
1917 | * Didn't find it, and we're holding a data block. Drop it. | |
1918 | */ | |
1919 | else if (state->extravalid) { | |
1920 | xfs_da_brelse(args->trans, state->extrablk.bp); | |
1921 | state->extrablk.bp = NULL; | |
1922 | } | |
1923 | /* | |
1924 | * Release all the buffers in the cursor. | |
1925 | */ | |
1926 | for (i = 0; i < state->path.active; i++) { | |
1927 | xfs_da_brelse(args->trans, state->path.blk[i].bp); | |
1928 | state->path.blk[i].bp = NULL; | |
1929 | } | |
1930 | xfs_da_state_free(state); | |
1931 | return rval; | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * Trim off a trailing empty freespace block. | |
1936 | * Return (in rvalp) 1 if we did it, 0 if not. | |
1937 | */ | |
1938 | int /* error */ | |
1939 | xfs_dir2_node_trim_free( | |
1940 | xfs_da_args_t *args, /* operation arguments */ | |
1941 | xfs_fileoff_t fo, /* free block number */ | |
1942 | int *rvalp) /* out: did something */ | |
1943 | { | |
1944 | xfs_dabuf_t *bp; /* freespace buffer */ | |
1945 | xfs_inode_t *dp; /* incore directory inode */ | |
1946 | int error; /* error return code */ | |
1947 | xfs_dir2_free_t *free; /* freespace structure */ | |
1948 | xfs_mount_t *mp; /* filesystem mount point */ | |
1949 | xfs_trans_t *tp; /* transaction pointer */ | |
1950 | ||
1951 | dp = args->dp; | |
1952 | mp = dp->i_mount; | |
1953 | tp = args->trans; | |
1954 | /* | |
1955 | * Read the freespace block. | |
1956 | */ | |
1957 | if (unlikely(error = xfs_da_read_buf(tp, dp, (xfs_dablk_t)fo, -2, &bp, | |
1958 | XFS_DATA_FORK))) { | |
1959 | return error; | |
1960 | } | |
1961 | ||
1962 | /* | |
1963 | * There can be holes in freespace. If fo is a hole, there's | |
1964 | * nothing to do. | |
1965 | */ | |
1966 | if (bp == NULL) { | |
1967 | return 0; | |
1968 | } | |
1969 | free = bp->data; | |
0ba962ef | 1970 | ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC); |
1da177e4 LT |
1971 | /* |
1972 | * If there are used entries, there's nothing to do. | |
1973 | */ | |
0ba962ef | 1974 | if (be32_to_cpu(free->hdr.nused) > 0) { |
1da177e4 LT |
1975 | xfs_da_brelse(tp, bp); |
1976 | *rvalp = 0; | |
1977 | return 0; | |
1978 | } | |
1979 | /* | |
1980 | * Blow the block away. | |
1981 | */ | |
1982 | if ((error = | |
bbaaf538 | 1983 | xfs_dir2_shrink_inode(args, xfs_dir2_da_to_db(mp, (xfs_dablk_t)fo), |
1da177e4 LT |
1984 | bp))) { |
1985 | /* | |
1986 | * Can't fail with ENOSPC since that only happens with no | |
1987 | * space reservation, when breaking up an extent into two | |
1988 | * pieces. This is the last block of an extent. | |
1989 | */ | |
1990 | ASSERT(error != ENOSPC); | |
1991 | xfs_da_brelse(tp, bp); | |
1992 | return error; | |
1993 | } | |
1994 | /* | |
1995 | * Return that we succeeded. | |
1996 | */ | |
1997 | *rvalp = 1; | |
1998 | return 0; | |
1999 | } |