Commit | Line | Data |
---|---|---|
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 LT |
21 | #include "xfs_log.h" |
22 | #include "xfs_trans.h" | |
23 | #include "xfs_sb.h" | |
da353b0d | 24 | #include "xfs_ag.h" |
1da177e4 | 25 | #include "xfs_mount.h" |
a844f451 | 26 | #include "xfs_da_btree.h" |
1da177e4 | 27 | #include "xfs_bmap_btree.h" |
1da177e4 LT |
28 | #include "xfs_dinode.h" |
29 | #include "xfs_inode.h" | |
30 | #include "xfs_bmap.h" | |
57926640 CH |
31 | #include "xfs_dir2_format.h" |
32 | #include "xfs_dir2_priv.h" | |
1da177e4 | 33 | #include "xfs_error.h" |
0b1b213f | 34 | #include "xfs_trace.h" |
1da177e4 LT |
35 | |
36 | /* | |
37 | * Function declarations. | |
38 | */ | |
1d9025e5 DC |
39 | static int xfs_dir2_leafn_add(struct xfs_buf *bp, xfs_da_args_t *args, |
40 | int index); | |
1da177e4 | 41 | #ifdef DEBUG |
1d9025e5 | 42 | static void xfs_dir2_leafn_check(struct xfs_inode *dp, struct xfs_buf *bp); |
1da177e4 LT |
43 | #else |
44 | #define xfs_dir2_leafn_check(dp, bp) | |
45 | #endif | |
1d9025e5 DC |
46 | static void xfs_dir2_leafn_moveents(xfs_da_args_t *args, struct xfs_buf *bp_s, |
47 | int start_s, struct xfs_buf *bp_d, | |
48 | int start_d, int count); | |
1da177e4 LT |
49 | static void xfs_dir2_leafn_rebalance(xfs_da_state_t *state, |
50 | xfs_da_state_blk_t *blk1, | |
51 | xfs_da_state_blk_t *blk2); | |
1d9025e5 | 52 | static int xfs_dir2_leafn_remove(xfs_da_args_t *args, struct xfs_buf *bp, |
1da177e4 LT |
53 | int index, xfs_da_state_blk_t *dblk, |
54 | int *rval); | |
55 | static int xfs_dir2_node_addname_int(xfs_da_args_t *args, | |
56 | xfs_da_state_blk_t *fblk); | |
57 | ||
2025207c DC |
58 | static void |
59 | xfs_dir2_free_verify( | |
60 | struct xfs_buf *bp) | |
61 | { | |
62 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
63 | struct xfs_dir2_free_hdr *hdr = bp->b_addr; | |
64 | int block_ok = 0; | |
65 | ||
66 | block_ok = hdr->magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC); | |
67 | if (!block_ok) { | |
68 | XFS_CORRUPTION_ERROR("xfs_dir2_free_verify magic", | |
69 | XFS_ERRLEVEL_LOW, mp, hdr); | |
70 | xfs_buf_ioerror(bp, EFSCORRUPTED); | |
71 | } | |
612cfbfe | 72 | } |
2025207c | 73 | |
612cfbfe DC |
74 | static void |
75 | xfs_dir2_free_write_verify( | |
76 | struct xfs_buf *bp) | |
77 | { | |
78 | xfs_dir2_free_verify(bp); | |
79 | } | |
80 | ||
81 | void | |
82 | xfs_dir2_free_read_verify( | |
83 | struct xfs_buf *bp) | |
84 | { | |
85 | xfs_dir2_free_verify(bp); | |
86 | bp->b_pre_io = xfs_dir2_free_write_verify; | |
2025207c DC |
87 | bp->b_iodone = NULL; |
88 | xfs_buf_ioend(bp, 0); | |
89 | } | |
90 | ||
612cfbfe | 91 | |
2025207c DC |
92 | static int |
93 | __xfs_dir2_free_read( | |
94 | struct xfs_trans *tp, | |
95 | struct xfs_inode *dp, | |
96 | xfs_dablk_t fbno, | |
97 | xfs_daddr_t mappedbno, | |
98 | struct xfs_buf **bpp) | |
99 | { | |
100 | return xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp, | |
612cfbfe | 101 | XFS_DATA_FORK, xfs_dir2_free_read_verify); |
2025207c DC |
102 | } |
103 | ||
104 | int | |
105 | xfs_dir2_free_read( | |
106 | struct xfs_trans *tp, | |
107 | struct xfs_inode *dp, | |
108 | xfs_dablk_t fbno, | |
109 | struct xfs_buf **bpp) | |
110 | { | |
111 | return __xfs_dir2_free_read(tp, dp, fbno, -1, bpp); | |
112 | } | |
113 | ||
114 | static int | |
115 | xfs_dir2_free_try_read( | |
116 | struct xfs_trans *tp, | |
117 | struct xfs_inode *dp, | |
118 | xfs_dablk_t fbno, | |
119 | struct xfs_buf **bpp) | |
120 | { | |
121 | return __xfs_dir2_free_read(tp, dp, fbno, -2, bpp); | |
122 | } | |
123 | ||
1da177e4 LT |
124 | /* |
125 | * Log entries from a freespace block. | |
126 | */ | |
5d77c0dc | 127 | STATIC void |
1da177e4 | 128 | xfs_dir2_free_log_bests( |
1d9025e5 DC |
129 | struct xfs_trans *tp, |
130 | struct xfs_buf *bp, | |
1da177e4 LT |
131 | int first, /* first entry to log */ |
132 | int last) /* last entry to log */ | |
133 | { | |
134 | xfs_dir2_free_t *free; /* freespace structure */ | |
135 | ||
1d9025e5 | 136 | free = bp->b_addr; |
69ef921b | 137 | ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); |
1d9025e5 | 138 | xfs_trans_log_buf(tp, bp, |
1da177e4 LT |
139 | (uint)((char *)&free->bests[first] - (char *)free), |
140 | (uint)((char *)&free->bests[last] - (char *)free + | |
141 | sizeof(free->bests[0]) - 1)); | |
142 | } | |
143 | ||
144 | /* | |
145 | * Log header from a freespace block. | |
146 | */ | |
147 | static void | |
148 | xfs_dir2_free_log_header( | |
1d9025e5 DC |
149 | struct xfs_trans *tp, |
150 | struct xfs_buf *bp) | |
1da177e4 LT |
151 | { |
152 | xfs_dir2_free_t *free; /* freespace structure */ | |
153 | ||
1d9025e5 | 154 | free = bp->b_addr; |
69ef921b | 155 | ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); |
1d9025e5 | 156 | xfs_trans_log_buf(tp, bp, (uint)((char *)&free->hdr - (char *)free), |
1da177e4 LT |
157 | (uint)(sizeof(xfs_dir2_free_hdr_t) - 1)); |
158 | } | |
159 | ||
160 | /* | |
161 | * Convert a leaf-format directory to a node-format directory. | |
162 | * We need to change the magic number of the leaf block, and copy | |
163 | * the freespace table out of the leaf block into its own block. | |
164 | */ | |
165 | int /* error */ | |
166 | xfs_dir2_leaf_to_node( | |
167 | xfs_da_args_t *args, /* operation arguments */ | |
1d9025e5 | 168 | struct xfs_buf *lbp) /* leaf buffer */ |
1da177e4 LT |
169 | { |
170 | xfs_inode_t *dp; /* incore directory inode */ | |
171 | int error; /* error return value */ | |
1d9025e5 | 172 | struct xfs_buf *fbp; /* freespace buffer */ |
1da177e4 LT |
173 | xfs_dir2_db_t fdb; /* freespace block number */ |
174 | xfs_dir2_free_t *free; /* freespace structure */ | |
68b3a102 | 175 | __be16 *from; /* pointer to freespace entry */ |
1da177e4 LT |
176 | int i; /* leaf freespace index */ |
177 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
178 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ | |
179 | xfs_mount_t *mp; /* filesystem mount point */ | |
180 | int n; /* count of live freespc ents */ | |
181 | xfs_dir2_data_off_t off; /* freespace entry value */ | |
0ba962ef | 182 | __be16 *to; /* pointer to freespace entry */ |
1da177e4 LT |
183 | xfs_trans_t *tp; /* transaction pointer */ |
184 | ||
0b1b213f CH |
185 | trace_xfs_dir2_leaf_to_node(args); |
186 | ||
1da177e4 LT |
187 | dp = args->dp; |
188 | mp = dp->i_mount; | |
189 | tp = args->trans; | |
190 | /* | |
191 | * Add a freespace block to the directory. | |
192 | */ | |
193 | if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, &fdb))) { | |
194 | return error; | |
195 | } | |
196 | ASSERT(fdb == XFS_DIR2_FREE_FIRSTDB(mp)); | |
197 | /* | |
198 | * Get the buffer for the new freespace block. | |
199 | */ | |
b0f539de DC |
200 | error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, fdb), -1, &fbp, |
201 | XFS_DATA_FORK); | |
202 | if (error) | |
1da177e4 | 203 | return error; |
b0f539de DC |
204 | fbp->b_pre_io = xfs_dir2_free_write_verify; |
205 | ||
1d9025e5 DC |
206 | free = fbp->b_addr; |
207 | leaf = lbp->b_addr; | |
bbaaf538 | 208 | ltp = xfs_dir2_leaf_tail_p(mp, leaf); |
1da177e4 LT |
209 | /* |
210 | * Initialize the freespace block header. | |
211 | */ | |
0ba962ef | 212 | free->hdr.magic = cpu_to_be32(XFS_DIR2_FREE_MAGIC); |
1da177e4 | 213 | free->hdr.firstdb = 0; |
afbcb3f9 | 214 | ASSERT(be32_to_cpu(ltp->bestcount) <= (uint)dp->i_d.di_size / mp->m_dirblksize); |
0ba962ef | 215 | free->hdr.nvalid = ltp->bestcount; |
1da177e4 LT |
216 | /* |
217 | * Copy freespace entries from the leaf block to the new block. | |
218 | * Count active entries. | |
219 | */ | |
bbaaf538 | 220 | for (i = n = 0, from = xfs_dir2_leaf_bests_p(ltp), to = free->bests; |
afbcb3f9 | 221 | i < be32_to_cpu(ltp->bestcount); i++, from++, to++) { |
68b3a102 | 222 | if ((off = be16_to_cpu(*from)) != NULLDATAOFF) |
1da177e4 | 223 | n++; |
0ba962ef | 224 | *to = cpu_to_be16(off); |
1da177e4 | 225 | } |
0ba962ef | 226 | free->hdr.nused = cpu_to_be32(n); |
b0f539de DC |
227 | |
228 | lbp->b_pre_io = xfs_dir2_leafn_write_verify; | |
89da0544 | 229 | leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAFN_MAGIC); |
b0f539de | 230 | |
1da177e4 LT |
231 | /* |
232 | * Log everything. | |
233 | */ | |
234 | xfs_dir2_leaf_log_header(tp, lbp); | |
235 | xfs_dir2_free_log_header(tp, fbp); | |
0ba962ef | 236 | xfs_dir2_free_log_bests(tp, fbp, 0, be32_to_cpu(free->hdr.nvalid) - 1); |
1da177e4 LT |
237 | xfs_dir2_leafn_check(dp, lbp); |
238 | return 0; | |
239 | } | |
240 | ||
241 | /* | |
242 | * Add a leaf entry to a leaf block in a node-form directory. | |
243 | * The other work necessary is done from the caller. | |
244 | */ | |
245 | static int /* error */ | |
246 | xfs_dir2_leafn_add( | |
1d9025e5 | 247 | struct xfs_buf *bp, /* leaf buffer */ |
1da177e4 LT |
248 | xfs_da_args_t *args, /* operation arguments */ |
249 | int index) /* insertion pt for new entry */ | |
250 | { | |
251 | int compact; /* compacting stale leaves */ | |
252 | xfs_inode_t *dp; /* incore directory inode */ | |
253 | int highstale; /* next stale entry */ | |
254 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
255 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
256 | int lfloghigh; /* high leaf entry logging */ | |
257 | int lfloglow; /* low leaf entry logging */ | |
258 | int lowstale; /* previous stale entry */ | |
259 | xfs_mount_t *mp; /* filesystem mount point */ | |
260 | xfs_trans_t *tp; /* transaction pointer */ | |
261 | ||
0b1b213f CH |
262 | trace_xfs_dir2_leafn_add(args, index); |
263 | ||
1da177e4 LT |
264 | dp = args->dp; |
265 | mp = dp->i_mount; | |
266 | tp = args->trans; | |
1d9025e5 | 267 | leaf = bp->b_addr; |
1da177e4 LT |
268 | |
269 | /* | |
270 | * Quick check just to make sure we are not going to index | |
271 | * into other peoples memory | |
272 | */ | |
273 | if (index < 0) | |
274 | return XFS_ERROR(EFSCORRUPTED); | |
275 | ||
276 | /* | |
277 | * If there are already the maximum number of leaf entries in | |
278 | * the block, if there are no stale entries it won't fit. | |
279 | * Caller will do a split. If there are stale entries we'll do | |
280 | * a compact. | |
281 | */ | |
282 | ||
bbaaf538 | 283 | if (be16_to_cpu(leaf->hdr.count) == xfs_dir2_max_leaf_ents(mp)) { |
1da177e4 LT |
284 | if (!leaf->hdr.stale) |
285 | return XFS_ERROR(ENOSPC); | |
a818e5de | 286 | compact = be16_to_cpu(leaf->hdr.stale) > 1; |
1da177e4 LT |
287 | } else |
288 | compact = 0; | |
3c1f9c15 | 289 | ASSERT(index == 0 || be32_to_cpu(leaf->ents[index - 1].hashval) <= args->hashval); |
a818e5de | 290 | ASSERT(index == be16_to_cpu(leaf->hdr.count) || |
3c1f9c15 | 291 | be32_to_cpu(leaf->ents[index].hashval) >= args->hashval); |
1da177e4 | 292 | |
6a178100 | 293 | if (args->op_flags & XFS_DA_OP_JUSTCHECK) |
1da177e4 LT |
294 | return 0; |
295 | ||
296 | /* | |
297 | * Compact out all but one stale leaf entry. Leaves behind | |
298 | * the entry closest to index. | |
299 | */ | |
300 | if (compact) { | |
301 | xfs_dir2_leaf_compact_x1(bp, &index, &lowstale, &highstale, | |
302 | &lfloglow, &lfloghigh); | |
303 | } | |
304 | /* | |
305 | * Set impossible logging indices for this case. | |
306 | */ | |
307 | else if (leaf->hdr.stale) { | |
a818e5de | 308 | lfloglow = be16_to_cpu(leaf->hdr.count); |
1da177e4 LT |
309 | lfloghigh = -1; |
310 | } | |
4fb44c82 | 311 | |
1da177e4 LT |
312 | /* |
313 | * Insert the new entry, log everything. | |
314 | */ | |
4fb44c82 CH |
315 | lep = xfs_dir2_leaf_find_entry(leaf, index, compact, lowstale, |
316 | highstale, &lfloglow, &lfloghigh); | |
317 | ||
3c1f9c15 | 318 | lep->hashval = cpu_to_be32(args->hashval); |
bbaaf538 | 319 | lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(mp, |
3c1f9c15 | 320 | args->blkno, args->index)); |
1da177e4 LT |
321 | xfs_dir2_leaf_log_header(tp, bp); |
322 | xfs_dir2_leaf_log_ents(tp, bp, lfloglow, lfloghigh); | |
323 | xfs_dir2_leafn_check(dp, bp); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | #ifdef DEBUG | |
328 | /* | |
329 | * Check internal consistency of a leafn block. | |
330 | */ | |
331 | void | |
332 | xfs_dir2_leafn_check( | |
1d9025e5 DC |
333 | struct xfs_inode *dp, |
334 | struct xfs_buf *bp) | |
1da177e4 LT |
335 | { |
336 | int i; /* leaf index */ | |
337 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
338 | xfs_mount_t *mp; /* filesystem mount point */ | |
339 | int stale; /* count of stale leaves */ | |
340 | ||
1d9025e5 | 341 | leaf = bp->b_addr; |
1da177e4 | 342 | mp = dp->i_mount; |
69ef921b | 343 | ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
bbaaf538 | 344 | ASSERT(be16_to_cpu(leaf->hdr.count) <= xfs_dir2_max_leaf_ents(mp)); |
a818e5de NS |
345 | for (i = stale = 0; i < be16_to_cpu(leaf->hdr.count); i++) { |
346 | if (i + 1 < be16_to_cpu(leaf->hdr.count)) { | |
3c1f9c15 NS |
347 | ASSERT(be32_to_cpu(leaf->ents[i].hashval) <= |
348 | be32_to_cpu(leaf->ents[i + 1].hashval)); | |
1da177e4 | 349 | } |
69ef921b | 350 | if (leaf->ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) |
1da177e4 LT |
351 | stale++; |
352 | } | |
a818e5de | 353 | ASSERT(be16_to_cpu(leaf->hdr.stale) == stale); |
1da177e4 LT |
354 | } |
355 | #endif /* DEBUG */ | |
356 | ||
357 | /* | |
358 | * Return the last hash value in the leaf. | |
359 | * Stale entries are ok. | |
360 | */ | |
361 | xfs_dahash_t /* hash value */ | |
362 | xfs_dir2_leafn_lasthash( | |
1d9025e5 | 363 | struct xfs_buf *bp, /* leaf buffer */ |
1da177e4 LT |
364 | int *count) /* count of entries in leaf */ |
365 | { | |
366 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
367 | ||
1d9025e5 | 368 | leaf = bp->b_addr; |
69ef921b | 369 | ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
1da177e4 | 370 | if (count) |
a818e5de | 371 | *count = be16_to_cpu(leaf->hdr.count); |
1da177e4 LT |
372 | if (!leaf->hdr.count) |
373 | return 0; | |
3c1f9c15 | 374 | return be32_to_cpu(leaf->ents[be16_to_cpu(leaf->hdr.count) - 1].hashval); |
1da177e4 LT |
375 | } |
376 | ||
377 | /* | |
f9f6dce0 BN |
378 | * Look up a leaf entry for space to add a name in a node-format leaf block. |
379 | * The extrablk in state is a freespace block. | |
1da177e4 | 380 | */ |
f9f6dce0 BN |
381 | STATIC int |
382 | xfs_dir2_leafn_lookup_for_addname( | |
1d9025e5 | 383 | struct xfs_buf *bp, /* leaf buffer */ |
1da177e4 LT |
384 | xfs_da_args_t *args, /* operation arguments */ |
385 | int *indexp, /* out: leaf entry index */ | |
386 | xfs_da_state_t *state) /* state to fill in */ | |
387 | { | |
1d9025e5 | 388 | struct xfs_buf *curbp = NULL; /* current data/free buffer */ |
f9f6dce0 BN |
389 | xfs_dir2_db_t curdb = -1; /* current data block number */ |
390 | xfs_dir2_db_t curfdb = -1; /* current free block number */ | |
1da177e4 LT |
391 | xfs_inode_t *dp; /* incore directory inode */ |
392 | int error; /* error return value */ | |
393 | int fi; /* free entry index */ | |
f9f6dce0 | 394 | xfs_dir2_free_t *free = NULL; /* free block structure */ |
1da177e4 LT |
395 | int index; /* leaf entry index */ |
396 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
f9f6dce0 | 397 | int length; /* length of new data entry */ |
1da177e4 LT |
398 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ |
399 | xfs_mount_t *mp; /* filesystem mount point */ | |
400 | xfs_dir2_db_t newdb; /* new data block number */ | |
401 | xfs_dir2_db_t newfdb; /* new free block number */ | |
402 | xfs_trans_t *tp; /* transaction pointer */ | |
403 | ||
404 | dp = args->dp; | |
405 | tp = args->trans; | |
406 | mp = dp->i_mount; | |
1d9025e5 | 407 | leaf = bp->b_addr; |
69ef921b | 408 | ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
1da177e4 | 409 | #ifdef __KERNEL__ |
a818e5de | 410 | ASSERT(be16_to_cpu(leaf->hdr.count) > 0); |
1da177e4 LT |
411 | #endif |
412 | xfs_dir2_leafn_check(dp, bp); | |
413 | /* | |
414 | * Look up the hash value in the leaf entries. | |
415 | */ | |
416 | index = xfs_dir2_leaf_search_hash(args, bp); | |
417 | /* | |
418 | * Do we have a buffer coming in? | |
419 | */ | |
f9f6dce0 BN |
420 | if (state->extravalid) { |
421 | /* If so, it's a free block buffer, get the block number. */ | |
1da177e4 | 422 | curbp = state->extrablk.bp; |
f9f6dce0 | 423 | curfdb = state->extrablk.blkno; |
1d9025e5 | 424 | free = curbp->b_addr; |
69ef921b | 425 | ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); |
1da177e4 | 426 | } |
f9f6dce0 | 427 | length = xfs_dir2_data_entsize(args->namelen); |
1da177e4 LT |
428 | /* |
429 | * Loop over leaf entries with the right hash value. | |
430 | */ | |
f9f6dce0 BN |
431 | for (lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) && |
432 | be32_to_cpu(lep->hashval) == args->hashval; | |
433 | lep++, index++) { | |
1da177e4 LT |
434 | /* |
435 | * Skip stale leaf entries. | |
436 | */ | |
3c1f9c15 | 437 | if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR) |
1da177e4 LT |
438 | continue; |
439 | /* | |
440 | * Pull the data block number from the entry. | |
441 | */ | |
bbaaf538 | 442 | newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); |
1da177e4 LT |
443 | /* |
444 | * For addname, we're looking for a place to put the new entry. | |
445 | * We want to use a data block with an entry of equal | |
446 | * hash value to ours if there is one with room. | |
f9f6dce0 BN |
447 | * |
448 | * If this block isn't the data block we already have | |
449 | * in hand, take a look at it. | |
1da177e4 | 450 | */ |
f9f6dce0 BN |
451 | if (newdb != curdb) { |
452 | curdb = newdb; | |
1da177e4 | 453 | /* |
f9f6dce0 BN |
454 | * Convert the data block to the free block |
455 | * holding its freespace information. | |
1da177e4 | 456 | */ |
f9f6dce0 | 457 | newfdb = xfs_dir2_db_to_fdb(mp, newdb); |
1da177e4 | 458 | /* |
f9f6dce0 | 459 | * If it's not the one we have in hand, read it in. |
1da177e4 | 460 | */ |
f9f6dce0 | 461 | if (newfdb != curfdb) { |
1da177e4 | 462 | /* |
f9f6dce0 | 463 | * If we had one before, drop it. |
1da177e4 LT |
464 | */ |
465 | if (curbp) | |
1d9025e5 | 466 | xfs_trans_brelse(tp, curbp); |
2025207c DC |
467 | |
468 | error = xfs_dir2_free_read(tp, dp, | |
f9f6dce0 | 469 | xfs_dir2_db_to_da(mp, newfdb), |
2025207c | 470 | &curbp); |
f9f6dce0 | 471 | if (error) |
1da177e4 | 472 | return error; |
1d9025e5 | 473 | free = curbp->b_addr; |
f9f6dce0 BN |
474 | ASSERT(be32_to_cpu(free->hdr.magic) == |
475 | XFS_DIR2_FREE_MAGIC); | |
476 | ASSERT((be32_to_cpu(free->hdr.firstdb) % | |
a00b7745 | 477 | xfs_dir2_free_max_bests(mp)) == 0); |
f9f6dce0 BN |
478 | ASSERT(be32_to_cpu(free->hdr.firstdb) <= curdb); |
479 | ASSERT(curdb < be32_to_cpu(free->hdr.firstdb) + | |
480 | be32_to_cpu(free->hdr.nvalid)); | |
1da177e4 LT |
481 | } |
482 | /* | |
f9f6dce0 | 483 | * Get the index for our entry. |
1da177e4 | 484 | */ |
f9f6dce0 | 485 | fi = xfs_dir2_db_to_fdindex(mp, curdb); |
1da177e4 | 486 | /* |
f9f6dce0 | 487 | * If it has room, return it. |
1da177e4 | 488 | */ |
69ef921b CH |
489 | if (unlikely(free->bests[fi] == |
490 | cpu_to_be16(NULLDATAOFF))) { | |
f9f6dce0 BN |
491 | XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int", |
492 | XFS_ERRLEVEL_LOW, mp); | |
493 | if (curfdb != newfdb) | |
1d9025e5 | 494 | xfs_trans_brelse(tp, curbp); |
f9f6dce0 | 495 | return XFS_ERROR(EFSCORRUPTED); |
1da177e4 | 496 | } |
f9f6dce0 BN |
497 | curfdb = newfdb; |
498 | if (be16_to_cpu(free->bests[fi]) >= length) | |
499 | goto out; | |
1da177e4 LT |
500 | } |
501 | } | |
f9f6dce0 BN |
502 | /* Didn't find any space */ |
503 | fi = -1; | |
504 | out: | |
6a178100 | 505 | ASSERT(args->op_flags & XFS_DA_OP_OKNOENT); |
f9f6dce0 BN |
506 | if (curbp) { |
507 | /* Giving back a free block. */ | |
508 | state->extravalid = 1; | |
509 | state->extrablk.bp = curbp; | |
510 | state->extrablk.index = fi; | |
511 | state->extrablk.blkno = curfdb; | |
512 | state->extrablk.magic = XFS_DIR2_FREE_MAGIC; | |
513 | } else { | |
514 | state->extravalid = 0; | |
515 | } | |
1da177e4 | 516 | /* |
f9f6dce0 | 517 | * Return the index, that will be the insertion point. |
1da177e4 | 518 | */ |
f9f6dce0 BN |
519 | *indexp = index; |
520 | return XFS_ERROR(ENOENT); | |
521 | } | |
522 | ||
523 | /* | |
524 | * Look up a leaf entry in a node-format leaf block. | |
525 | * The extrablk in state a data block. | |
526 | */ | |
527 | STATIC int | |
528 | xfs_dir2_leafn_lookup_for_entry( | |
1d9025e5 | 529 | struct xfs_buf *bp, /* leaf buffer */ |
f9f6dce0 BN |
530 | xfs_da_args_t *args, /* operation arguments */ |
531 | int *indexp, /* out: leaf entry index */ | |
532 | xfs_da_state_t *state) /* state to fill in */ | |
533 | { | |
1d9025e5 | 534 | struct xfs_buf *curbp = NULL; /* current data/free buffer */ |
f9f6dce0 BN |
535 | xfs_dir2_db_t curdb = -1; /* current data block number */ |
536 | xfs_dir2_data_entry_t *dep; /* data block entry */ | |
537 | xfs_inode_t *dp; /* incore directory inode */ | |
538 | int error; /* error return value */ | |
f9f6dce0 BN |
539 | int index; /* leaf entry index */ |
540 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
541 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
542 | xfs_mount_t *mp; /* filesystem mount point */ | |
543 | xfs_dir2_db_t newdb; /* new data block number */ | |
544 | xfs_trans_t *tp; /* transaction pointer */ | |
5163f95a | 545 | enum xfs_dacmp cmp; /* comparison result */ |
f9f6dce0 BN |
546 | |
547 | dp = args->dp; | |
548 | tp = args->trans; | |
549 | mp = dp->i_mount; | |
1d9025e5 | 550 | leaf = bp->b_addr; |
69ef921b | 551 | ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
f9f6dce0 BN |
552 | #ifdef __KERNEL__ |
553 | ASSERT(be16_to_cpu(leaf->hdr.count) > 0); | |
554 | #endif | |
555 | xfs_dir2_leafn_check(dp, bp); | |
556 | /* | |
557 | * Look up the hash value in the leaf entries. | |
558 | */ | |
559 | index = xfs_dir2_leaf_search_hash(args, bp); | |
560 | /* | |
561 | * Do we have a buffer coming in? | |
562 | */ | |
563 | if (state->extravalid) { | |
564 | curbp = state->extrablk.bp; | |
565 | curdb = state->extrablk.blkno; | |
566 | } | |
567 | /* | |
568 | * Loop over leaf entries with the right hash value. | |
569 | */ | |
570 | for (lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) && | |
571 | be32_to_cpu(lep->hashval) == args->hashval; | |
572 | lep++, index++) { | |
573 | /* | |
574 | * Skip stale leaf entries. | |
575 | */ | |
576 | if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR) | |
577 | continue; | |
1da177e4 | 578 | /* |
f9f6dce0 BN |
579 | * Pull the data block number from the entry. |
580 | */ | |
581 | newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); | |
582 | /* | |
583 | * Not adding a new entry, so we really want to find | |
584 | * the name given to us. | |
585 | * | |
586 | * If it's a different data block, go get it. | |
1da177e4 | 587 | */ |
f9f6dce0 BN |
588 | if (newdb != curdb) { |
589 | /* | |
90bb7ab0 BN |
590 | * If we had a block before that we aren't saving |
591 | * for a CI name, drop it | |
f9f6dce0 | 592 | */ |
90bb7ab0 BN |
593 | if (curbp && (args->cmpresult == XFS_CMP_DIFFERENT || |
594 | curdb != state->extrablk.blkno)) | |
1d9025e5 | 595 | xfs_trans_brelse(tp, curbp); |
f9f6dce0 | 596 | /* |
90bb7ab0 BN |
597 | * If needing the block that is saved with a CI match, |
598 | * use it otherwise read in the new data block. | |
f9f6dce0 | 599 | */ |
90bb7ab0 BN |
600 | if (args->cmpresult != XFS_CMP_DIFFERENT && |
601 | newdb == state->extrablk.blkno) { | |
602 | ASSERT(state->extravalid); | |
603 | curbp = state->extrablk.bp; | |
604 | } else { | |
e4813572 | 605 | error = xfs_dir2_data_read(tp, dp, |
90bb7ab0 | 606 | xfs_dir2_db_to_da(mp, newdb), |
e4813572 | 607 | -1, &curbp); |
90bb7ab0 BN |
608 | if (error) |
609 | return error; | |
610 | } | |
f9f6dce0 BN |
611 | xfs_dir2_data_check(dp, curbp); |
612 | curdb = newdb; | |
1da177e4 LT |
613 | } |
614 | /* | |
f9f6dce0 | 615 | * Point to the data entry. |
1da177e4 | 616 | */ |
1d9025e5 | 617 | dep = (xfs_dir2_data_entry_t *)((char *)curbp->b_addr + |
f9f6dce0 BN |
618 | xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address))); |
619 | /* | |
5163f95a BN |
620 | * Compare the entry and if it's an exact match, return |
621 | * EEXIST immediately. If it's the first case-insensitive | |
90bb7ab0 | 622 | * match, store the block & inode number and continue looking. |
f9f6dce0 | 623 | */ |
5163f95a BN |
624 | cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen); |
625 | if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) { | |
90bb7ab0 BN |
626 | /* If there is a CI match block, drop it */ |
627 | if (args->cmpresult != XFS_CMP_DIFFERENT && | |
628 | curdb != state->extrablk.blkno) | |
1d9025e5 | 629 | xfs_trans_brelse(tp, state->extrablk.bp); |
5163f95a | 630 | args->cmpresult = cmp; |
f9f6dce0 | 631 | args->inumber = be64_to_cpu(dep->inumber); |
90bb7ab0 BN |
632 | *indexp = index; |
633 | state->extravalid = 1; | |
634 | state->extrablk.bp = curbp; | |
635 | state->extrablk.blkno = curdb; | |
636 | state->extrablk.index = (int)((char *)dep - | |
1d9025e5 | 637 | (char *)curbp->b_addr); |
90bb7ab0 | 638 | state->extrablk.magic = XFS_DIR2_DATA_MAGIC; |
b0f539de | 639 | curbp->b_pre_io = xfs_dir2_data_write_verify; |
5163f95a | 640 | if (cmp == XFS_CMP_EXACT) |
90bb7ab0 | 641 | return XFS_ERROR(EEXIST); |
1da177e4 LT |
642 | } |
643 | } | |
6a178100 BN |
644 | ASSERT(index == be16_to_cpu(leaf->hdr.count) || |
645 | (args->op_flags & XFS_DA_OP_OKNOENT)); | |
f9f6dce0 | 646 | if (curbp) { |
90bb7ab0 BN |
647 | if (args->cmpresult == XFS_CMP_DIFFERENT) { |
648 | /* Giving back last used data block. */ | |
649 | state->extravalid = 1; | |
650 | state->extrablk.bp = curbp; | |
651 | state->extrablk.index = -1; | |
652 | state->extrablk.blkno = curdb; | |
653 | state->extrablk.magic = XFS_DIR2_DATA_MAGIC; | |
b0f539de | 654 | curbp->b_pre_io = xfs_dir2_data_write_verify; |
90bb7ab0 BN |
655 | } else { |
656 | /* If the curbp is not the CI match block, drop it */ | |
657 | if (state->extrablk.bp != curbp) | |
1d9025e5 | 658 | xfs_trans_brelse(tp, curbp); |
90bb7ab0 | 659 | } |
f9f6dce0 BN |
660 | } else { |
661 | state->extravalid = 0; | |
662 | } | |
1da177e4 | 663 | *indexp = index; |
90bb7ab0 | 664 | return XFS_ERROR(ENOENT); |
f9f6dce0 BN |
665 | } |
666 | ||
667 | /* | |
668 | * Look up a leaf entry in a node-format leaf block. | |
669 | * If this is an addname then the extrablk in state is a freespace block, | |
670 | * otherwise it's a data block. | |
671 | */ | |
672 | int | |
673 | xfs_dir2_leafn_lookup_int( | |
1d9025e5 | 674 | struct xfs_buf *bp, /* leaf buffer */ |
f9f6dce0 BN |
675 | xfs_da_args_t *args, /* operation arguments */ |
676 | int *indexp, /* out: leaf entry index */ | |
677 | xfs_da_state_t *state) /* state to fill in */ | |
678 | { | |
6a178100 | 679 | if (args->op_flags & XFS_DA_OP_ADDNAME) |
f9f6dce0 BN |
680 | return xfs_dir2_leafn_lookup_for_addname(bp, args, indexp, |
681 | state); | |
682 | return xfs_dir2_leafn_lookup_for_entry(bp, args, indexp, state); | |
1da177e4 LT |
683 | } |
684 | ||
685 | /* | |
686 | * Move count leaf entries from source to destination leaf. | |
687 | * Log entries and headers. Stale entries are preserved. | |
688 | */ | |
689 | static void | |
690 | xfs_dir2_leafn_moveents( | |
691 | xfs_da_args_t *args, /* operation arguments */ | |
1d9025e5 | 692 | struct xfs_buf *bp_s, /* source leaf buffer */ |
1da177e4 | 693 | int start_s, /* source leaf index */ |
1d9025e5 | 694 | struct xfs_buf *bp_d, /* destination leaf buffer */ |
1da177e4 LT |
695 | int start_d, /* destination leaf index */ |
696 | int count) /* count of leaves to copy */ | |
697 | { | |
698 | xfs_dir2_leaf_t *leaf_d; /* destination leaf structure */ | |
699 | xfs_dir2_leaf_t *leaf_s; /* source leaf structure */ | |
700 | int stale; /* count stale leaves copied */ | |
701 | xfs_trans_t *tp; /* transaction pointer */ | |
702 | ||
0b1b213f CH |
703 | trace_xfs_dir2_leafn_moveents(args, start_s, start_d, count); |
704 | ||
1da177e4 LT |
705 | /* |
706 | * Silently return if nothing to do. | |
707 | */ | |
708 | if (count == 0) { | |
709 | return; | |
710 | } | |
711 | tp = args->trans; | |
1d9025e5 DC |
712 | leaf_s = bp_s->b_addr; |
713 | leaf_d = bp_d->b_addr; | |
1da177e4 LT |
714 | /* |
715 | * If the destination index is not the end of the current | |
716 | * destination leaf entries, open up a hole in the destination | |
717 | * to hold the new entries. | |
718 | */ | |
a818e5de | 719 | if (start_d < be16_to_cpu(leaf_d->hdr.count)) { |
1da177e4 | 720 | memmove(&leaf_d->ents[start_d + count], &leaf_d->ents[start_d], |
a818e5de | 721 | (be16_to_cpu(leaf_d->hdr.count) - start_d) * |
1da177e4 LT |
722 | sizeof(xfs_dir2_leaf_entry_t)); |
723 | xfs_dir2_leaf_log_ents(tp, bp_d, start_d + count, | |
a818e5de | 724 | count + be16_to_cpu(leaf_d->hdr.count) - 1); |
1da177e4 LT |
725 | } |
726 | /* | |
727 | * If the source has stale leaves, count the ones in the copy range | |
728 | * so we can update the header correctly. | |
729 | */ | |
730 | if (leaf_s->hdr.stale) { | |
731 | int i; /* temp leaf index */ | |
732 | ||
733 | for (i = start_s, stale = 0; i < start_s + count; i++) { | |
69ef921b CH |
734 | if (leaf_s->ents[i].address == |
735 | cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) | |
1da177e4 LT |
736 | stale++; |
737 | } | |
738 | } else | |
739 | stale = 0; | |
740 | /* | |
741 | * Copy the leaf entries from source to destination. | |
742 | */ | |
743 | memcpy(&leaf_d->ents[start_d], &leaf_s->ents[start_s], | |
744 | count * sizeof(xfs_dir2_leaf_entry_t)); | |
745 | xfs_dir2_leaf_log_ents(tp, bp_d, start_d, start_d + count - 1); | |
746 | /* | |
747 | * If there are source entries after the ones we copied, | |
748 | * delete the ones we copied by sliding the next ones down. | |
749 | */ | |
a818e5de | 750 | if (start_s + count < be16_to_cpu(leaf_s->hdr.count)) { |
1da177e4 LT |
751 | memmove(&leaf_s->ents[start_s], &leaf_s->ents[start_s + count], |
752 | count * sizeof(xfs_dir2_leaf_entry_t)); | |
753 | xfs_dir2_leaf_log_ents(tp, bp_s, start_s, start_s + count - 1); | |
754 | } | |
755 | /* | |
756 | * Update the headers and log them. | |
757 | */ | |
413d57c9 MS |
758 | be16_add_cpu(&leaf_s->hdr.count, -(count)); |
759 | be16_add_cpu(&leaf_s->hdr.stale, -(stale)); | |
760 | be16_add_cpu(&leaf_d->hdr.count, count); | |
761 | be16_add_cpu(&leaf_d->hdr.stale, stale); | |
1da177e4 LT |
762 | xfs_dir2_leaf_log_header(tp, bp_s); |
763 | xfs_dir2_leaf_log_header(tp, bp_d); | |
764 | xfs_dir2_leafn_check(args->dp, bp_s); | |
765 | xfs_dir2_leafn_check(args->dp, bp_d); | |
766 | } | |
767 | ||
768 | /* | |
769 | * Determine the sort order of two leaf blocks. | |
770 | * Returns 1 if both are valid and leaf2 should be before leaf1, else 0. | |
771 | */ | |
772 | int /* sort order */ | |
773 | xfs_dir2_leafn_order( | |
1d9025e5 DC |
774 | struct xfs_buf *leaf1_bp, /* leaf1 buffer */ |
775 | struct xfs_buf *leaf2_bp) /* leaf2 buffer */ | |
1da177e4 LT |
776 | { |
777 | xfs_dir2_leaf_t *leaf1; /* leaf1 structure */ | |
778 | xfs_dir2_leaf_t *leaf2; /* leaf2 structure */ | |
779 | ||
1d9025e5 DC |
780 | leaf1 = leaf1_bp->b_addr; |
781 | leaf2 = leaf2_bp->b_addr; | |
69ef921b CH |
782 | ASSERT(leaf1->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
783 | ASSERT(leaf2->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); | |
a818e5de NS |
784 | if (be16_to_cpu(leaf1->hdr.count) > 0 && |
785 | be16_to_cpu(leaf2->hdr.count) > 0 && | |
3c1f9c15 NS |
786 | (be32_to_cpu(leaf2->ents[0].hashval) < be32_to_cpu(leaf1->ents[0].hashval) || |
787 | be32_to_cpu(leaf2->ents[be16_to_cpu(leaf2->hdr.count) - 1].hashval) < | |
788 | be32_to_cpu(leaf1->ents[be16_to_cpu(leaf1->hdr.count) - 1].hashval))) | |
1da177e4 LT |
789 | return 1; |
790 | return 0; | |
791 | } | |
792 | ||
793 | /* | |
794 | * Rebalance leaf entries between two leaf blocks. | |
795 | * This is actually only called when the second block is new, | |
796 | * though the code deals with the general case. | |
797 | * A new entry will be inserted in one of the blocks, and that | |
798 | * entry is taken into account when balancing. | |
799 | */ | |
800 | static void | |
801 | xfs_dir2_leafn_rebalance( | |
802 | xfs_da_state_t *state, /* btree cursor */ | |
803 | xfs_da_state_blk_t *blk1, /* first btree block */ | |
804 | xfs_da_state_blk_t *blk2) /* second btree block */ | |
805 | { | |
806 | xfs_da_args_t *args; /* operation arguments */ | |
807 | int count; /* count (& direction) leaves */ | |
808 | int isleft; /* new goes in left leaf */ | |
809 | xfs_dir2_leaf_t *leaf1; /* first leaf structure */ | |
810 | xfs_dir2_leaf_t *leaf2; /* second leaf structure */ | |
811 | int mid; /* midpoint leaf index */ | |
812 | #ifdef DEBUG | |
813 | int oldstale; /* old count of stale leaves */ | |
814 | #endif | |
815 | int oldsum; /* old total leaf count */ | |
816 | int swap; /* swapped leaf blocks */ | |
817 | ||
818 | args = state->args; | |
819 | /* | |
820 | * If the block order is wrong, swap the arguments. | |
821 | */ | |
822 | if ((swap = xfs_dir2_leafn_order(blk1->bp, blk2->bp))) { | |
823 | xfs_da_state_blk_t *tmp; /* temp for block swap */ | |
824 | ||
825 | tmp = blk1; | |
826 | blk1 = blk2; | |
827 | blk2 = tmp; | |
828 | } | |
1d9025e5 DC |
829 | leaf1 = blk1->bp->b_addr; |
830 | leaf2 = blk2->bp->b_addr; | |
a818e5de | 831 | oldsum = be16_to_cpu(leaf1->hdr.count) + be16_to_cpu(leaf2->hdr.count); |
1da177e4 | 832 | #ifdef DEBUG |
a818e5de | 833 | oldstale = be16_to_cpu(leaf1->hdr.stale) + be16_to_cpu(leaf2->hdr.stale); |
1da177e4 LT |
834 | #endif |
835 | mid = oldsum >> 1; | |
836 | /* | |
837 | * If the old leaf count was odd then the new one will be even, | |
838 | * so we need to divide the new count evenly. | |
839 | */ | |
840 | if (oldsum & 1) { | |
841 | xfs_dahash_t midhash; /* middle entry hash value */ | |
842 | ||
a818e5de | 843 | if (mid >= be16_to_cpu(leaf1->hdr.count)) |
3c1f9c15 | 844 | midhash = be32_to_cpu(leaf2->ents[mid - be16_to_cpu(leaf1->hdr.count)].hashval); |
1da177e4 | 845 | else |
3c1f9c15 | 846 | midhash = be32_to_cpu(leaf1->ents[mid].hashval); |
1da177e4 LT |
847 | isleft = args->hashval <= midhash; |
848 | } | |
849 | /* | |
850 | * If the old count is even then the new count is odd, so there's | |
851 | * no preferred side for the new entry. | |
852 | * Pick the left one. | |
853 | */ | |
854 | else | |
855 | isleft = 1; | |
856 | /* | |
857 | * Calculate moved entry count. Positive means left-to-right, | |
858 | * negative means right-to-left. Then move the entries. | |
859 | */ | |
a818e5de | 860 | count = be16_to_cpu(leaf1->hdr.count) - mid + (isleft == 0); |
1da177e4 LT |
861 | if (count > 0) |
862 | xfs_dir2_leafn_moveents(args, blk1->bp, | |
a818e5de | 863 | be16_to_cpu(leaf1->hdr.count) - count, blk2->bp, 0, count); |
1da177e4 LT |
864 | else if (count < 0) |
865 | xfs_dir2_leafn_moveents(args, blk2->bp, 0, blk1->bp, | |
a818e5de NS |
866 | be16_to_cpu(leaf1->hdr.count), count); |
867 | ASSERT(be16_to_cpu(leaf1->hdr.count) + be16_to_cpu(leaf2->hdr.count) == oldsum); | |
868 | ASSERT(be16_to_cpu(leaf1->hdr.stale) + be16_to_cpu(leaf2->hdr.stale) == oldstale); | |
1da177e4 LT |
869 | /* |
870 | * Mark whether we're inserting into the old or new leaf. | |
871 | */ | |
a818e5de | 872 | if (be16_to_cpu(leaf1->hdr.count) < be16_to_cpu(leaf2->hdr.count)) |
1da177e4 | 873 | state->inleaf = swap; |
a818e5de | 874 | else if (be16_to_cpu(leaf1->hdr.count) > be16_to_cpu(leaf2->hdr.count)) |
1da177e4 LT |
875 | state->inleaf = !swap; |
876 | else | |
877 | state->inleaf = | |
a818e5de | 878 | swap ^ (blk1->index <= be16_to_cpu(leaf1->hdr.count)); |
1da177e4 LT |
879 | /* |
880 | * Adjust the expected index for insertion. | |
881 | */ | |
882 | if (!state->inleaf) | |
a818e5de | 883 | blk2->index = blk1->index - be16_to_cpu(leaf1->hdr.count); |
f9f6dce0 BN |
884 | |
885 | /* | |
886 | * Finally sanity check just to make sure we are not returning a | |
887 | * negative index | |
1da177e4 LT |
888 | */ |
889 | if(blk2->index < 0) { | |
890 | state->inleaf = 1; | |
891 | blk2->index = 0; | |
0b932ccc DC |
892 | xfs_alert(args->dp->i_mount, |
893 | "%s: picked the wrong leaf? reverting original leaf: blk1->index %d\n", | |
894 | __func__, blk1->index); | |
1da177e4 LT |
895 | } |
896 | } | |
897 | ||
2025207c DC |
898 | static int |
899 | xfs_dir2_data_block_free( | |
900 | xfs_da_args_t *args, | |
901 | struct xfs_dir2_data_hdr *hdr, | |
902 | struct xfs_dir2_free *free, | |
903 | xfs_dir2_db_t fdb, | |
904 | int findex, | |
905 | struct xfs_buf *fbp, | |
906 | int longest) | |
907 | { | |
908 | struct xfs_trans *tp = args->trans; | |
909 | int logfree = 0; | |
910 | ||
911 | if (!hdr) { | |
912 | /* One less used entry in the free table. */ | |
913 | be32_add_cpu(&free->hdr.nused, -1); | |
914 | xfs_dir2_free_log_header(tp, fbp); | |
915 | ||
916 | /* | |
917 | * If this was the last entry in the table, we can trim the | |
918 | * table size back. There might be other entries at the end | |
919 | * referring to non-existent data blocks, get those too. | |
920 | */ | |
921 | if (findex == be32_to_cpu(free->hdr.nvalid) - 1) { | |
922 | int i; /* free entry index */ | |
923 | ||
924 | for (i = findex - 1; i >= 0; i--) { | |
925 | if (free->bests[i] != cpu_to_be16(NULLDATAOFF)) | |
926 | break; | |
927 | } | |
928 | free->hdr.nvalid = cpu_to_be32(i + 1); | |
929 | logfree = 0; | |
930 | } else { | |
931 | /* Not the last entry, just punch it out. */ | |
932 | free->bests[findex] = cpu_to_be16(NULLDATAOFF); | |
933 | logfree = 1; | |
934 | } | |
935 | /* | |
936 | * If there are no useful entries left in the block, | |
937 | * get rid of the block if we can. | |
938 | */ | |
939 | if (!free->hdr.nused) { | |
940 | int error; | |
941 | ||
942 | error = xfs_dir2_shrink_inode(args, fdb, fbp); | |
943 | if (error == 0) { | |
944 | fbp = NULL; | |
945 | logfree = 0; | |
946 | } else if (error != ENOSPC || args->total != 0) | |
947 | return error; | |
948 | /* | |
949 | * It's possible to get ENOSPC if there is no | |
950 | * space reservation. In this case some one | |
951 | * else will eventually get rid of this block. | |
952 | */ | |
953 | } | |
954 | } else { | |
955 | /* | |
956 | * Data block is not empty, just set the free entry to the new | |
957 | * value. | |
958 | */ | |
959 | free->bests[findex] = cpu_to_be16(longest); | |
960 | logfree = 1; | |
961 | } | |
962 | ||
963 | /* Log the free entry that changed, unless we got rid of it. */ | |
964 | if (logfree) | |
965 | xfs_dir2_free_log_bests(tp, fbp, findex, findex); | |
966 | return 0; | |
967 | } | |
968 | ||
1da177e4 LT |
969 | /* |
970 | * Remove an entry from a node directory. | |
971 | * This removes the leaf entry and the data entry, | |
972 | * and updates the free block if necessary. | |
973 | */ | |
974 | static int /* error */ | |
975 | xfs_dir2_leafn_remove( | |
976 | xfs_da_args_t *args, /* operation arguments */ | |
1d9025e5 | 977 | struct xfs_buf *bp, /* leaf buffer */ |
1da177e4 LT |
978 | int index, /* leaf entry index */ |
979 | xfs_da_state_blk_t *dblk, /* data block */ | |
980 | int *rval) /* resulting block needs join */ | |
981 | { | |
c2066e26 | 982 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
1da177e4 | 983 | xfs_dir2_db_t db; /* data block number */ |
1d9025e5 | 984 | struct xfs_buf *dbp; /* data block buffer */ |
1da177e4 LT |
985 | xfs_dir2_data_entry_t *dep; /* data block entry */ |
986 | xfs_inode_t *dp; /* incore directory inode */ | |
987 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
988 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
989 | int longest; /* longest data free entry */ | |
990 | int off; /* data block entry offset */ | |
991 | xfs_mount_t *mp; /* filesystem mount point */ | |
992 | int needlog; /* need to log data header */ | |
993 | int needscan; /* need to rescan data frees */ | |
994 | xfs_trans_t *tp; /* transaction pointer */ | |
995 | ||
0b1b213f CH |
996 | trace_xfs_dir2_leafn_remove(args, index); |
997 | ||
1da177e4 LT |
998 | dp = args->dp; |
999 | tp = args->trans; | |
1000 | mp = dp->i_mount; | |
1d9025e5 | 1001 | leaf = bp->b_addr; |
69ef921b | 1002 | ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
1da177e4 LT |
1003 | /* |
1004 | * Point to the entry we're removing. | |
1005 | */ | |
1006 | lep = &leaf->ents[index]; | |
1007 | /* | |
1008 | * Extract the data block and offset from the entry. | |
1009 | */ | |
bbaaf538 | 1010 | db = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); |
1da177e4 | 1011 | ASSERT(dblk->blkno == db); |
bbaaf538 | 1012 | off = xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)); |
1da177e4 LT |
1013 | ASSERT(dblk->index == off); |
1014 | /* | |
1015 | * Kill the leaf entry by marking it stale. | |
1016 | * Log the leaf block changes. | |
1017 | */ | |
413d57c9 | 1018 | be16_add_cpu(&leaf->hdr.stale, 1); |
1da177e4 | 1019 | xfs_dir2_leaf_log_header(tp, bp); |
3c1f9c15 | 1020 | lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR); |
1da177e4 LT |
1021 | xfs_dir2_leaf_log_ents(tp, bp, index, index); |
1022 | /* | |
1023 | * Make the data entry free. Keep track of the longest freespace | |
1024 | * in the data block in case it changes. | |
1025 | */ | |
1026 | dbp = dblk->bp; | |
1d9025e5 | 1027 | hdr = dbp->b_addr; |
c2066e26 CH |
1028 | dep = (xfs_dir2_data_entry_t *)((char *)hdr + off); |
1029 | longest = be16_to_cpu(hdr->bestfree[0].length); | |
1da177e4 LT |
1030 | needlog = needscan = 0; |
1031 | xfs_dir2_data_make_free(tp, dbp, off, | |
bbaaf538 | 1032 | xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan); |
1da177e4 LT |
1033 | /* |
1034 | * Rescan the data block freespaces for bestfree. | |
1035 | * Log the data block header if needed. | |
1036 | */ | |
1037 | if (needscan) | |
c2066e26 | 1038 | xfs_dir2_data_freescan(mp, hdr, &needlog); |
1da177e4 LT |
1039 | if (needlog) |
1040 | xfs_dir2_data_log_header(tp, dbp); | |
1041 | xfs_dir2_data_check(dp, dbp); | |
1042 | /* | |
1043 | * If the longest data block freespace changes, need to update | |
1044 | * the corresponding freeblock entry. | |
1045 | */ | |
c2066e26 | 1046 | if (longest < be16_to_cpu(hdr->bestfree[0].length)) { |
1da177e4 | 1047 | int error; /* error return value */ |
1d9025e5 | 1048 | struct xfs_buf *fbp; /* freeblock buffer */ |
1da177e4 LT |
1049 | xfs_dir2_db_t fdb; /* freeblock block number */ |
1050 | int findex; /* index in freeblock entries */ | |
1051 | xfs_dir2_free_t *free; /* freeblock structure */ | |
1da177e4 LT |
1052 | |
1053 | /* | |
1054 | * Convert the data block number to a free block, | |
1055 | * read in the free block. | |
1056 | */ | |
bbaaf538 | 1057 | fdb = xfs_dir2_db_to_fdb(mp, db); |
2025207c DC |
1058 | error = xfs_dir2_free_read(tp, dp, xfs_dir2_db_to_da(mp, fdb), |
1059 | &fbp); | |
4bb20a83 | 1060 | if (error) |
1da177e4 | 1061 | return error; |
1d9025e5 | 1062 | free = fbp->b_addr; |
69ef921b | 1063 | ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); |
0ba962ef | 1064 | ASSERT(be32_to_cpu(free->hdr.firstdb) == |
a00b7745 | 1065 | xfs_dir2_free_max_bests(mp) * |
1da177e4 LT |
1066 | (fdb - XFS_DIR2_FREE_FIRSTDB(mp))); |
1067 | /* | |
1068 | * Calculate which entry we need to fix. | |
1069 | */ | |
bbaaf538 | 1070 | findex = xfs_dir2_db_to_fdindex(mp, db); |
c2066e26 | 1071 | longest = be16_to_cpu(hdr->bestfree[0].length); |
1da177e4 LT |
1072 | /* |
1073 | * If the data block is now empty we can get rid of it | |
1074 | * (usually). | |
1075 | */ | |
c2066e26 | 1076 | if (longest == mp->m_dirblksize - (uint)sizeof(*hdr)) { |
1da177e4 LT |
1077 | /* |
1078 | * Try to punch out the data block. | |
1079 | */ | |
1080 | error = xfs_dir2_shrink_inode(args, db, dbp); | |
1081 | if (error == 0) { | |
1082 | dblk->bp = NULL; | |
c2066e26 | 1083 | hdr = NULL; |
1da177e4 LT |
1084 | } |
1085 | /* | |
1086 | * We can get ENOSPC if there's no space reservation. | |
1087 | * In this case just drop the buffer and some one else | |
1088 | * will eventually get rid of the empty block. | |
1089 | */ | |
1d9025e5 | 1090 | else if (!(error == ENOSPC && args->total == 0)) |
1da177e4 LT |
1091 | return error; |
1092 | } | |
1093 | /* | |
1094 | * If we got rid of the data block, we can eliminate that entry | |
1095 | * in the free block. | |
1096 | */ | |
2025207c DC |
1097 | error = xfs_dir2_data_block_free(args, hdr, free, |
1098 | fdb, findex, fbp, longest); | |
1099 | if (error) | |
1100 | return error; | |
1da177e4 | 1101 | } |
2025207c | 1102 | |
1da177e4 LT |
1103 | xfs_dir2_leafn_check(dp, bp); |
1104 | /* | |
9da096fd | 1105 | * Return indication of whether this leaf block is empty enough |
1da177e4 LT |
1106 | * to justify trying to join it with a neighbor. |
1107 | */ | |
1108 | *rval = | |
1109 | ((uint)sizeof(leaf->hdr) + | |
1110 | (uint)sizeof(leaf->ents[0]) * | |
a818e5de | 1111 | (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale))) < |
1da177e4 LT |
1112 | mp->m_dir_magicpct; |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Split the leaf entries in the old block into old and new blocks. | |
1118 | */ | |
1119 | int /* error */ | |
1120 | xfs_dir2_leafn_split( | |
1121 | xfs_da_state_t *state, /* btree cursor */ | |
1122 | xfs_da_state_blk_t *oldblk, /* original block */ | |
1123 | xfs_da_state_blk_t *newblk) /* newly created block */ | |
1124 | { | |
1125 | xfs_da_args_t *args; /* operation arguments */ | |
1126 | xfs_dablk_t blkno; /* new leaf block number */ | |
1127 | int error; /* error return value */ | |
1128 | xfs_mount_t *mp; /* filesystem mount point */ | |
1129 | ||
1130 | /* | |
1131 | * Allocate space for a new leaf node. | |
1132 | */ | |
1133 | args = state->args; | |
1134 | mp = args->dp->i_mount; | |
1135 | ASSERT(args != NULL); | |
1136 | ASSERT(oldblk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1137 | error = xfs_da_grow_inode(args, &blkno); | |
1138 | if (error) { | |
1139 | return error; | |
1140 | } | |
1141 | /* | |
1142 | * Initialize the new leaf block. | |
1143 | */ | |
bbaaf538 | 1144 | error = xfs_dir2_leaf_init(args, xfs_dir2_da_to_db(mp, blkno), |
1da177e4 LT |
1145 | &newblk->bp, XFS_DIR2_LEAFN_MAGIC); |
1146 | if (error) { | |
1147 | return error; | |
1148 | } | |
1149 | newblk->blkno = blkno; | |
1150 | newblk->magic = XFS_DIR2_LEAFN_MAGIC; | |
1151 | /* | |
1152 | * Rebalance the entries across the two leaves, link the new | |
1153 | * block into the leaves. | |
1154 | */ | |
1155 | xfs_dir2_leafn_rebalance(state, oldblk, newblk); | |
1156 | error = xfs_da_blk_link(state, oldblk, newblk); | |
1157 | if (error) { | |
1158 | return error; | |
1159 | } | |
1160 | /* | |
1161 | * Insert the new entry in the correct block. | |
1162 | */ | |
1163 | if (state->inleaf) | |
1164 | error = xfs_dir2_leafn_add(oldblk->bp, args, oldblk->index); | |
1165 | else | |
1166 | error = xfs_dir2_leafn_add(newblk->bp, args, newblk->index); | |
1167 | /* | |
1168 | * Update last hashval in each block since we added the name. | |
1169 | */ | |
1170 | oldblk->hashval = xfs_dir2_leafn_lasthash(oldblk->bp, NULL); | |
1171 | newblk->hashval = xfs_dir2_leafn_lasthash(newblk->bp, NULL); | |
1172 | xfs_dir2_leafn_check(args->dp, oldblk->bp); | |
1173 | xfs_dir2_leafn_check(args->dp, newblk->bp); | |
1174 | return error; | |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * Check a leaf block and its neighbors to see if the block should be | |
1179 | * collapsed into one or the other neighbor. Always keep the block | |
1180 | * with the smaller block number. | |
1181 | * If the current block is over 50% full, don't try to join it, return 0. | |
1182 | * If the block is empty, fill in the state structure and return 2. | |
1183 | * If it can be collapsed, fill in the state structure and return 1. | |
1184 | * If nothing can be done, return 0. | |
1185 | */ | |
1186 | int /* error */ | |
1187 | xfs_dir2_leafn_toosmall( | |
1188 | xfs_da_state_t *state, /* btree cursor */ | |
1189 | int *action) /* resulting action to take */ | |
1190 | { | |
1191 | xfs_da_state_blk_t *blk; /* leaf block */ | |
1192 | xfs_dablk_t blkno; /* leaf block number */ | |
1d9025e5 | 1193 | struct xfs_buf *bp; /* leaf buffer */ |
1da177e4 LT |
1194 | int bytes; /* bytes in use */ |
1195 | int count; /* leaf live entry count */ | |
1196 | int error; /* error return value */ | |
1197 | int forward; /* sibling block direction */ | |
1198 | int i; /* sibling counter */ | |
1199 | xfs_da_blkinfo_t *info; /* leaf block header */ | |
1200 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1201 | int rval; /* result from path_shift */ | |
1202 | ||
1203 | /* | |
1204 | * Check for the degenerate case of the block being over 50% full. | |
1205 | * If so, it's not worth even looking to see if we might be able | |
1206 | * to coalesce with a sibling. | |
1207 | */ | |
1208 | blk = &state->path.blk[state->path.active - 1]; | |
1d9025e5 | 1209 | info = blk->bp->b_addr; |
69ef921b | 1210 | ASSERT(info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
1da177e4 | 1211 | leaf = (xfs_dir2_leaf_t *)info; |
a818e5de | 1212 | count = be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); |
1da177e4 LT |
1213 | bytes = (uint)sizeof(leaf->hdr) + count * (uint)sizeof(leaf->ents[0]); |
1214 | if (bytes > (state->blocksize >> 1)) { | |
1215 | /* | |
1216 | * Blk over 50%, don't try to join. | |
1217 | */ | |
1218 | *action = 0; | |
1219 | return 0; | |
1220 | } | |
1221 | /* | |
1222 | * Check for the degenerate case of the block being empty. | |
1223 | * If the block is empty, we'll simply delete it, no need to | |
1224 | * coalesce it with a sibling block. We choose (arbitrarily) | |
1225 | * to merge with the forward block unless it is NULL. | |
1226 | */ | |
1227 | if (count == 0) { | |
1228 | /* | |
1229 | * Make altpath point to the block we want to keep and | |
1230 | * path point to the block we want to drop (this one). | |
1231 | */ | |
89da0544 | 1232 | forward = (info->forw != 0); |
1da177e4 LT |
1233 | memcpy(&state->altpath, &state->path, sizeof(state->path)); |
1234 | error = xfs_da_path_shift(state, &state->altpath, forward, 0, | |
1235 | &rval); | |
1236 | if (error) | |
1237 | return error; | |
1238 | *action = rval ? 2 : 0; | |
1239 | return 0; | |
1240 | } | |
1241 | /* | |
1242 | * Examine each sibling block to see if we can coalesce with | |
1243 | * at least 25% free space to spare. We need to figure out | |
1244 | * whether to merge with the forward or the backward block. | |
1245 | * We prefer coalescing with the lower numbered sibling so as | |
1246 | * to shrink a directory over time. | |
1247 | */ | |
89da0544 | 1248 | forward = be32_to_cpu(info->forw) < be32_to_cpu(info->back); |
1da177e4 | 1249 | for (i = 0, bp = NULL; i < 2; forward = !forward, i++) { |
89da0544 | 1250 | blkno = forward ? be32_to_cpu(info->forw) : be32_to_cpu(info->back); |
1da177e4 LT |
1251 | if (blkno == 0) |
1252 | continue; | |
1253 | /* | |
1254 | * Read the sibling leaf block. | |
1255 | */ | |
e6f7667c DC |
1256 | error = xfs_dir2_leafn_read(state->args->trans, state->args->dp, |
1257 | blkno, -1, &bp); | |
4bb20a83 | 1258 | if (error) |
1da177e4 | 1259 | return error; |
e6f7667c | 1260 | |
1da177e4 LT |
1261 | /* |
1262 | * Count bytes in the two blocks combined. | |
1263 | */ | |
1264 | leaf = (xfs_dir2_leaf_t *)info; | |
a818e5de | 1265 | count = be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); |
1da177e4 | 1266 | bytes = state->blocksize - (state->blocksize >> 2); |
1d9025e5 | 1267 | leaf = bp->b_addr; |
69ef921b | 1268 | ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
a818e5de | 1269 | count += be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); |
1da177e4 LT |
1270 | bytes -= count * (uint)sizeof(leaf->ents[0]); |
1271 | /* | |
1272 | * Fits with at least 25% to spare. | |
1273 | */ | |
1274 | if (bytes >= 0) | |
1275 | break; | |
1d9025e5 | 1276 | xfs_trans_brelse(state->args->trans, bp); |
1da177e4 LT |
1277 | } |
1278 | /* | |
1279 | * Didn't like either block, give up. | |
1280 | */ | |
1281 | if (i >= 2) { | |
1282 | *action = 0; | |
1283 | return 0; | |
1284 | } | |
1d9025e5 | 1285 | |
1da177e4 LT |
1286 | /* |
1287 | * Make altpath point to the block we want to keep (the lower | |
1288 | * numbered block) and path point to the block we want to drop. | |
1289 | */ | |
1290 | memcpy(&state->altpath, &state->path, sizeof(state->path)); | |
1291 | if (blkno < blk->blkno) | |
1292 | error = xfs_da_path_shift(state, &state->altpath, forward, 0, | |
1293 | &rval); | |
1294 | else | |
1295 | error = xfs_da_path_shift(state, &state->path, forward, 0, | |
1296 | &rval); | |
1297 | if (error) { | |
1298 | return error; | |
1299 | } | |
1300 | *action = rval ? 0 : 1; | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Move all the leaf entries from drop_blk to save_blk. | |
1306 | * This is done as part of a join operation. | |
1307 | */ | |
1308 | void | |
1309 | xfs_dir2_leafn_unbalance( | |
1310 | xfs_da_state_t *state, /* cursor */ | |
1311 | xfs_da_state_blk_t *drop_blk, /* dead block */ | |
1312 | xfs_da_state_blk_t *save_blk) /* surviving block */ | |
1313 | { | |
1314 | xfs_da_args_t *args; /* operation arguments */ | |
1315 | xfs_dir2_leaf_t *drop_leaf; /* dead leaf structure */ | |
1316 | xfs_dir2_leaf_t *save_leaf; /* surviving leaf structure */ | |
1317 | ||
1318 | args = state->args; | |
1319 | ASSERT(drop_blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1320 | ASSERT(save_blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1d9025e5 DC |
1321 | drop_leaf = drop_blk->bp->b_addr; |
1322 | save_leaf = save_blk->bp->b_addr; | |
69ef921b CH |
1323 | ASSERT(drop_leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
1324 | ASSERT(save_leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); | |
1da177e4 LT |
1325 | /* |
1326 | * If there are any stale leaf entries, take this opportunity | |
1327 | * to purge them. | |
1328 | */ | |
a818e5de | 1329 | if (drop_leaf->hdr.stale) |
1da177e4 | 1330 | xfs_dir2_leaf_compact(args, drop_blk->bp); |
a818e5de | 1331 | if (save_leaf->hdr.stale) |
1da177e4 LT |
1332 | xfs_dir2_leaf_compact(args, save_blk->bp); |
1333 | /* | |
1334 | * Move the entries from drop to the appropriate end of save. | |
1335 | */ | |
3c1f9c15 | 1336 | drop_blk->hashval = be32_to_cpu(drop_leaf->ents[be16_to_cpu(drop_leaf->hdr.count) - 1].hashval); |
1da177e4 LT |
1337 | if (xfs_dir2_leafn_order(save_blk->bp, drop_blk->bp)) |
1338 | xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, 0, | |
a818e5de | 1339 | be16_to_cpu(drop_leaf->hdr.count)); |
1da177e4 LT |
1340 | else |
1341 | xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, | |
a818e5de | 1342 | be16_to_cpu(save_leaf->hdr.count), be16_to_cpu(drop_leaf->hdr.count)); |
3c1f9c15 | 1343 | save_blk->hashval = be32_to_cpu(save_leaf->ents[be16_to_cpu(save_leaf->hdr.count) - 1].hashval); |
1da177e4 LT |
1344 | xfs_dir2_leafn_check(args->dp, save_blk->bp); |
1345 | } | |
1346 | ||
1347 | /* | |
1348 | * Top-level node form directory addname routine. | |
1349 | */ | |
1350 | int /* error */ | |
1351 | xfs_dir2_node_addname( | |
1352 | xfs_da_args_t *args) /* operation arguments */ | |
1353 | { | |
1354 | xfs_da_state_blk_t *blk; /* leaf block for insert */ | |
1355 | int error; /* error return value */ | |
1356 | int rval; /* sub-return value */ | |
1357 | xfs_da_state_t *state; /* btree cursor */ | |
1358 | ||
0b1b213f CH |
1359 | trace_xfs_dir2_node_addname(args); |
1360 | ||
1da177e4 LT |
1361 | /* |
1362 | * Allocate and initialize the state (btree cursor). | |
1363 | */ | |
1364 | state = xfs_da_state_alloc(); | |
1365 | state->args = args; | |
1366 | state->mp = args->dp->i_mount; | |
1367 | state->blocksize = state->mp->m_dirblksize; | |
1368 | state->node_ents = state->mp->m_dir_node_ents; | |
1369 | /* | |
1370 | * Look up the name. We're not supposed to find it, but | |
1371 | * this gives us the insertion point. | |
1372 | */ | |
1373 | error = xfs_da_node_lookup_int(state, &rval); | |
1374 | if (error) | |
1375 | rval = error; | |
1376 | if (rval != ENOENT) { | |
1377 | goto done; | |
1378 | } | |
1379 | /* | |
1380 | * Add the data entry to a data block. | |
1381 | * Extravalid is set to a freeblock found by lookup. | |
1382 | */ | |
1383 | rval = xfs_dir2_node_addname_int(args, | |
1384 | state->extravalid ? &state->extrablk : NULL); | |
1385 | if (rval) { | |
1386 | goto done; | |
1387 | } | |
1388 | blk = &state->path.blk[state->path.active - 1]; | |
1389 | ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1390 | /* | |
1391 | * Add the new leaf entry. | |
1392 | */ | |
1393 | rval = xfs_dir2_leafn_add(blk->bp, args, blk->index); | |
1394 | if (rval == 0) { | |
1395 | /* | |
1396 | * It worked, fix the hash values up the btree. | |
1397 | */ | |
6a178100 | 1398 | if (!(args->op_flags & XFS_DA_OP_JUSTCHECK)) |
1da177e4 LT |
1399 | xfs_da_fixhashpath(state, &state->path); |
1400 | } else { | |
1401 | /* | |
1402 | * It didn't work, we need to split the leaf block. | |
1403 | */ | |
1404 | if (args->total == 0) { | |
1405 | ASSERT(rval == ENOSPC); | |
1406 | goto done; | |
1407 | } | |
1408 | /* | |
1409 | * Split the leaf block and insert the new entry. | |
1410 | */ | |
1411 | rval = xfs_da_split(state); | |
1412 | } | |
1413 | done: | |
1414 | xfs_da_state_free(state); | |
1415 | return rval; | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * Add the data entry for a node-format directory name addition. | |
1420 | * The leaf entry is added in xfs_dir2_leafn_add. | |
1421 | * We may enter with a freespace block that the lookup found. | |
1422 | */ | |
1423 | static int /* error */ | |
1424 | xfs_dir2_node_addname_int( | |
1425 | xfs_da_args_t *args, /* operation arguments */ | |
1426 | xfs_da_state_blk_t *fblk) /* optional freespace block */ | |
1427 | { | |
c2066e26 | 1428 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
1da177e4 | 1429 | xfs_dir2_db_t dbno; /* data block number */ |
1d9025e5 | 1430 | struct xfs_buf *dbp; /* data block buffer */ |
1da177e4 LT |
1431 | xfs_dir2_data_entry_t *dep; /* data entry pointer */ |
1432 | xfs_inode_t *dp; /* incore directory inode */ | |
1433 | xfs_dir2_data_unused_t *dup; /* data unused entry pointer */ | |
1434 | int error; /* error return value */ | |
1435 | xfs_dir2_db_t fbno; /* freespace block number */ | |
1d9025e5 | 1436 | struct xfs_buf *fbp; /* freespace buffer */ |
1da177e4 LT |
1437 | int findex; /* freespace entry index */ |
1438 | xfs_dir2_free_t *free=NULL; /* freespace block structure */ | |
1439 | xfs_dir2_db_t ifbno; /* initial freespace block no */ | |
1440 | xfs_dir2_db_t lastfbno=0; /* highest freespace block no */ | |
1441 | int length; /* length of the new entry */ | |
1442 | int logfree; /* need to log free entry */ | |
1443 | xfs_mount_t *mp; /* filesystem mount point */ | |
1444 | int needlog; /* need to log data header */ | |
1445 | int needscan; /* need to rescan data frees */ | |
3d693c6e | 1446 | __be16 *tagp; /* data entry tag pointer */ |
1da177e4 LT |
1447 | xfs_trans_t *tp; /* transaction pointer */ |
1448 | ||
1449 | dp = args->dp; | |
1450 | mp = dp->i_mount; | |
1451 | tp = args->trans; | |
bbaaf538 | 1452 | length = xfs_dir2_data_entsize(args->namelen); |
1da177e4 LT |
1453 | /* |
1454 | * If we came in with a freespace block that means that lookup | |
1455 | * found an entry with our hash value. This is the freespace | |
1456 | * block for that data entry. | |
1457 | */ | |
1458 | if (fblk) { | |
1459 | fbp = fblk->bp; | |
1460 | /* | |
1461 | * Remember initial freespace block number. | |
1462 | */ | |
1463 | ifbno = fblk->blkno; | |
1d9025e5 | 1464 | free = fbp->b_addr; |
69ef921b | 1465 | ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); |
1da177e4 LT |
1466 | findex = fblk->index; |
1467 | /* | |
1468 | * This means the free entry showed that the data block had | |
1469 | * space for our entry, so we remembered it. | |
1470 | * Use that data block. | |
1471 | */ | |
1472 | if (findex >= 0) { | |
0ba962ef NS |
1473 | ASSERT(findex < be32_to_cpu(free->hdr.nvalid)); |
1474 | ASSERT(be16_to_cpu(free->bests[findex]) != NULLDATAOFF); | |
1475 | ASSERT(be16_to_cpu(free->bests[findex]) >= length); | |
1476 | dbno = be32_to_cpu(free->hdr.firstdb) + findex; | |
1da177e4 LT |
1477 | } |
1478 | /* | |
1479 | * The data block looked at didn't have enough room. | |
1480 | * We'll start at the beginning of the freespace entries. | |
1481 | */ | |
1482 | else { | |
1483 | dbno = -1; | |
1484 | findex = 0; | |
1485 | } | |
1486 | } | |
1487 | /* | |
1488 | * Didn't come in with a freespace block, so don't have a data block. | |
1489 | */ | |
1490 | else { | |
1491 | ifbno = dbno = -1; | |
1492 | fbp = NULL; | |
1493 | findex = 0; | |
1494 | } | |
1495 | /* | |
1496 | * If we don't have a data block yet, we're going to scan the | |
1497 | * freespace blocks looking for one. Figure out what the | |
1498 | * highest freespace block number is. | |
1499 | */ | |
1500 | if (dbno == -1) { | |
1501 | xfs_fileoff_t fo; /* freespace block number */ | |
1502 | ||
1503 | if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) | |
1504 | return error; | |
bbaaf538 | 1505 | lastfbno = xfs_dir2_da_to_db(mp, (xfs_dablk_t)fo); |
1da177e4 LT |
1506 | fbno = ifbno; |
1507 | } | |
1508 | /* | |
1509 | * While we haven't identified a data block, search the freeblock | |
1510 | * data for a good data block. If we find a null freeblock entry, | |
1511 | * indicating a hole in the data blocks, remember that. | |
1512 | */ | |
1513 | while (dbno == -1) { | |
1514 | /* | |
1515 | * If we don't have a freeblock in hand, get the next one. | |
1516 | */ | |
1517 | if (fbp == NULL) { | |
1518 | /* | |
1519 | * Happens the first time through unless lookup gave | |
1520 | * us a freespace block to start with. | |
1521 | */ | |
1522 | if (++fbno == 0) | |
1523 | fbno = XFS_DIR2_FREE_FIRSTDB(mp); | |
1524 | /* | |
1525 | * If it's ifbno we already looked at it. | |
1526 | */ | |
1527 | if (fbno == ifbno) | |
1528 | fbno++; | |
1529 | /* | |
1530 | * If it's off the end we're done. | |
1531 | */ | |
1532 | if (fbno >= lastfbno) | |
1533 | break; | |
1534 | /* | |
1535 | * Read the block. There can be holes in the | |
1536 | * freespace blocks, so this might not succeed. | |
1537 | * This should be really rare, so there's no reason | |
1538 | * to avoid it. | |
1539 | */ | |
2025207c DC |
1540 | error = xfs_dir2_free_try_read(tp, dp, |
1541 | xfs_dir2_db_to_da(mp, fbno), | |
1542 | &fbp); | |
4bb20a83 | 1543 | if (error) |
1da177e4 | 1544 | return error; |
4bb20a83 | 1545 | if (!fbp) |
1da177e4 | 1546 | continue; |
1d9025e5 | 1547 | free = fbp->b_addr; |
69ef921b | 1548 | ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); |
1da177e4 LT |
1549 | findex = 0; |
1550 | } | |
1551 | /* | |
1552 | * Look at the current free entry. Is it good enough? | |
1553 | */ | |
0ba962ef NS |
1554 | if (be16_to_cpu(free->bests[findex]) != NULLDATAOFF && |
1555 | be16_to_cpu(free->bests[findex]) >= length) | |
1556 | dbno = be32_to_cpu(free->hdr.firstdb) + findex; | |
1da177e4 LT |
1557 | else { |
1558 | /* | |
1559 | * Are we done with the freeblock? | |
1560 | */ | |
0ba962ef | 1561 | if (++findex == be32_to_cpu(free->hdr.nvalid)) { |
1da177e4 LT |
1562 | /* |
1563 | * Drop the block. | |
1564 | */ | |
1d9025e5 | 1565 | xfs_trans_brelse(tp, fbp); |
1da177e4 LT |
1566 | fbp = NULL; |
1567 | if (fblk && fblk->bp) | |
1568 | fblk->bp = NULL; | |
1569 | } | |
1570 | } | |
1571 | } | |
1572 | /* | |
1573 | * If we don't have a data block, we need to allocate one and make | |
1574 | * the freespace entries refer to it. | |
1575 | */ | |
1576 | if (unlikely(dbno == -1)) { | |
1577 | /* | |
1578 | * Not allowed to allocate, return failure. | |
1579 | */ | |
1d9025e5 | 1580 | if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0) |
1da177e4 | 1581 | return XFS_ERROR(ENOSPC); |
1d9025e5 | 1582 | |
1da177e4 LT |
1583 | /* |
1584 | * Allocate and initialize the new data block. | |
1585 | */ | |
1586 | if (unlikely((error = xfs_dir2_grow_inode(args, | |
1587 | XFS_DIR2_DATA_SPACE, | |
1588 | &dbno)) || | |
1d9025e5 | 1589 | (error = xfs_dir2_data_init(args, dbno, &dbp)))) |
1da177e4 | 1590 | return error; |
1d9025e5 | 1591 | |
1da177e4 LT |
1592 | /* |
1593 | * If (somehow) we have a freespace block, get rid of it. | |
1594 | */ | |
1595 | if (fbp) | |
1d9025e5 | 1596 | xfs_trans_brelse(tp, fbp); |
1da177e4 LT |
1597 | if (fblk && fblk->bp) |
1598 | fblk->bp = NULL; | |
1599 | ||
1600 | /* | |
1601 | * Get the freespace block corresponding to the data block | |
1602 | * that was just allocated. | |
1603 | */ | |
bbaaf538 | 1604 | fbno = xfs_dir2_db_to_fdb(mp, dbno); |
2025207c DC |
1605 | error = xfs_dir2_free_try_read(tp, dp, |
1606 | xfs_dir2_db_to_da(mp, fbno), | |
1607 | &fbp); | |
4bb20a83 | 1608 | if (error) |
1da177e4 | 1609 | return error; |
1d9025e5 | 1610 | |
1da177e4 LT |
1611 | /* |
1612 | * If there wasn't a freespace block, the read will | |
1613 | * return a NULL fbp. Allocate and initialize a new one. | |
1614 | */ | |
1615 | if( fbp == NULL ) { | |
1616 | if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, | |
1617 | &fbno))) { | |
1618 | return error; | |
1619 | } | |
1620 | ||
bbaaf538 | 1621 | if (unlikely(xfs_dir2_db_to_fdb(mp, dbno) != fbno)) { |
0b932ccc | 1622 | xfs_alert(mp, |
df2e301f | 1623 | "%s: dir ino %llu needed freesp block %lld for\n" |
0b932ccc DC |
1624 | " data block %lld, got %lld ifbno %llu lastfbno %d", |
1625 | __func__, (unsigned long long)dp->i_ino, | |
bbaaf538 | 1626 | (long long)xfs_dir2_db_to_fdb(mp, dbno), |
1da177e4 LT |
1627 | (long long)dbno, (long long)fbno, |
1628 | (unsigned long long)ifbno, lastfbno); | |
1629 | if (fblk) { | |
0b932ccc DC |
1630 | xfs_alert(mp, |
1631 | " fblk 0x%p blkno %llu index %d magic 0x%x", | |
1da177e4 LT |
1632 | fblk, |
1633 | (unsigned long long)fblk->blkno, | |
1634 | fblk->index, | |
1635 | fblk->magic); | |
1636 | } else { | |
0b932ccc | 1637 | xfs_alert(mp, " ... fblk is NULL"); |
1da177e4 LT |
1638 | } |
1639 | XFS_ERROR_REPORT("xfs_dir2_node_addname_int", | |
1640 | XFS_ERRLEVEL_LOW, mp); | |
1641 | return XFS_ERROR(EFSCORRUPTED); | |
1642 | } | |
1643 | ||
1644 | /* | |
1645 | * Get a buffer for the new block. | |
1646 | */ | |
b0f539de DC |
1647 | error = xfs_da_get_buf(tp, dp, |
1648 | xfs_dir2_db_to_da(mp, fbno), | |
1649 | -1, &fbp, XFS_DATA_FORK); | |
1650 | if (error) | |
1da177e4 | 1651 | return error; |
b0f539de | 1652 | fbp->b_pre_io = xfs_dir2_free_write_verify; |
1da177e4 LT |
1653 | |
1654 | /* | |
1655 | * Initialize the new block to be empty, and remember | |
1656 | * its first slot as our empty slot. | |
1657 | */ | |
1d9025e5 | 1658 | free = fbp->b_addr; |
0ba962ef NS |
1659 | free->hdr.magic = cpu_to_be32(XFS_DIR2_FREE_MAGIC); |
1660 | free->hdr.firstdb = cpu_to_be32( | |
1da177e4 | 1661 | (fbno - XFS_DIR2_FREE_FIRSTDB(mp)) * |
a00b7745 | 1662 | xfs_dir2_free_max_bests(mp)); |
1da177e4 LT |
1663 | free->hdr.nvalid = 0; |
1664 | free->hdr.nused = 0; | |
1665 | } else { | |
1d9025e5 | 1666 | free = fbp->b_addr; |
69ef921b | 1667 | ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); |
1da177e4 LT |
1668 | } |
1669 | ||
1670 | /* | |
1671 | * Set the freespace block index from the data block number. | |
1672 | */ | |
bbaaf538 | 1673 | findex = xfs_dir2_db_to_fdindex(mp, dbno); |
1da177e4 LT |
1674 | /* |
1675 | * If it's after the end of the current entries in the | |
1676 | * freespace block, extend that table. | |
1677 | */ | |
0ba962ef | 1678 | if (findex >= be32_to_cpu(free->hdr.nvalid)) { |
a00b7745 | 1679 | ASSERT(findex < xfs_dir2_free_max_bests(mp)); |
0ba962ef | 1680 | free->hdr.nvalid = cpu_to_be32(findex + 1); |
1da177e4 LT |
1681 | /* |
1682 | * Tag new entry so nused will go up. | |
1683 | */ | |
0ba962ef | 1684 | free->bests[findex] = cpu_to_be16(NULLDATAOFF); |
1da177e4 LT |
1685 | } |
1686 | /* | |
1687 | * If this entry was for an empty data block | |
1688 | * (this should always be true) then update the header. | |
1689 | */ | |
69ef921b | 1690 | if (free->bests[findex] == cpu_to_be16(NULLDATAOFF)) { |
413d57c9 | 1691 | be32_add_cpu(&free->hdr.nused, 1); |
1da177e4 LT |
1692 | xfs_dir2_free_log_header(tp, fbp); |
1693 | } | |
1694 | /* | |
1695 | * Update the real value in the table. | |
1696 | * We haven't allocated the data entry yet so this will | |
1697 | * change again. | |
1698 | */ | |
1d9025e5 | 1699 | hdr = dbp->b_addr; |
c2066e26 | 1700 | free->bests[findex] = hdr->bestfree[0].length; |
1da177e4 LT |
1701 | logfree = 1; |
1702 | } | |
1703 | /* | |
1704 | * We had a data block so we don't have to make a new one. | |
1705 | */ | |
1706 | else { | |
1707 | /* | |
1708 | * If just checking, we succeeded. | |
1709 | */ | |
1d9025e5 | 1710 | if (args->op_flags & XFS_DA_OP_JUSTCHECK) |
1da177e4 | 1711 | return 0; |
1d9025e5 | 1712 | |
1da177e4 LT |
1713 | /* |
1714 | * Read the data block in. | |
1715 | */ | |
e4813572 DC |
1716 | error = xfs_dir2_data_read(tp, dp, xfs_dir2_db_to_da(mp, dbno), |
1717 | -1, &dbp); | |
1d9025e5 | 1718 | if (error) |
1da177e4 | 1719 | return error; |
1d9025e5 | 1720 | hdr = dbp->b_addr; |
1da177e4 LT |
1721 | logfree = 0; |
1722 | } | |
c2066e26 | 1723 | ASSERT(be16_to_cpu(hdr->bestfree[0].length) >= length); |
1da177e4 LT |
1724 | /* |
1725 | * Point to the existing unused space. | |
1726 | */ | |
1727 | dup = (xfs_dir2_data_unused_t *) | |
c2066e26 | 1728 | ((char *)hdr + be16_to_cpu(hdr->bestfree[0].offset)); |
1da177e4 LT |
1729 | needscan = needlog = 0; |
1730 | /* | |
1731 | * Mark the first part of the unused space, inuse for us. | |
1732 | */ | |
1733 | xfs_dir2_data_use_free(tp, dbp, dup, | |
c2066e26 | 1734 | (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length, |
1da177e4 LT |
1735 | &needlog, &needscan); |
1736 | /* | |
1737 | * Fill in the new entry and log it. | |
1738 | */ | |
1739 | dep = (xfs_dir2_data_entry_t *)dup; | |
ff9901c1 | 1740 | dep->inumber = cpu_to_be64(args->inumber); |
1da177e4 LT |
1741 | dep->namelen = args->namelen; |
1742 | memcpy(dep->name, args->name, dep->namelen); | |
bbaaf538 | 1743 | tagp = xfs_dir2_data_entry_tag_p(dep); |
c2066e26 | 1744 | *tagp = cpu_to_be16((char *)dep - (char *)hdr); |
1da177e4 LT |
1745 | xfs_dir2_data_log_entry(tp, dbp, dep); |
1746 | /* | |
1747 | * Rescan the block for bestfree if needed. | |
1748 | */ | |
1749 | if (needscan) | |
c2066e26 | 1750 | xfs_dir2_data_freescan(mp, hdr, &needlog); |
1da177e4 LT |
1751 | /* |
1752 | * Log the data block header if needed. | |
1753 | */ | |
1754 | if (needlog) | |
1755 | xfs_dir2_data_log_header(tp, dbp); | |
1756 | /* | |
1757 | * If the freespace entry is now wrong, update it. | |
1758 | */ | |
c2066e26 CH |
1759 | if (be16_to_cpu(free->bests[findex]) != be16_to_cpu(hdr->bestfree[0].length)) { |
1760 | free->bests[findex] = hdr->bestfree[0].length; | |
1da177e4 LT |
1761 | logfree = 1; |
1762 | } | |
1763 | /* | |
1764 | * Log the freespace entry if needed. | |
1765 | */ | |
1766 | if (logfree) | |
1767 | xfs_dir2_free_log_bests(tp, fbp, findex, findex); | |
1da177e4 LT |
1768 | /* |
1769 | * Return the data block and offset in args, then drop the data block. | |
1770 | */ | |
1771 | args->blkno = (xfs_dablk_t)dbno; | |
3d693c6e | 1772 | args->index = be16_to_cpu(*tagp); |
1da177e4 LT |
1773 | return 0; |
1774 | } | |
1775 | ||
1776 | /* | |
1777 | * Lookup an entry in a node-format directory. | |
1778 | * All the real work happens in xfs_da_node_lookup_int. | |
1779 | * The only real output is the inode number of the entry. | |
1780 | */ | |
1781 | int /* error */ | |
1782 | xfs_dir2_node_lookup( | |
1783 | xfs_da_args_t *args) /* operation arguments */ | |
1784 | { | |
1785 | int error; /* error return value */ | |
1786 | int i; /* btree level */ | |
1787 | int rval; /* operation return value */ | |
1788 | xfs_da_state_t *state; /* btree cursor */ | |
1789 | ||
0b1b213f CH |
1790 | trace_xfs_dir2_node_lookup(args); |
1791 | ||
1da177e4 LT |
1792 | /* |
1793 | * Allocate and initialize the btree cursor. | |
1794 | */ | |
1795 | state = xfs_da_state_alloc(); | |
1796 | state->args = args; | |
1797 | state->mp = args->dp->i_mount; | |
1798 | state->blocksize = state->mp->m_dirblksize; | |
1799 | state->node_ents = state->mp->m_dir_node_ents; | |
1800 | /* | |
1801 | * Fill in the path to the entry in the cursor. | |
1802 | */ | |
1803 | error = xfs_da_node_lookup_int(state, &rval); | |
1804 | if (error) | |
1805 | rval = error; | |
384f3ced BN |
1806 | else if (rval == ENOENT && args->cmpresult == XFS_CMP_CASE) { |
1807 | /* If a CI match, dup the actual name and return EEXIST */ | |
1808 | xfs_dir2_data_entry_t *dep; | |
1809 | ||
1d9025e5 DC |
1810 | dep = (xfs_dir2_data_entry_t *) |
1811 | ((char *)state->extrablk.bp->b_addr + | |
1812 | state->extrablk.index); | |
384f3ced BN |
1813 | rval = xfs_dir_cilookup_result(args, dep->name, dep->namelen); |
1814 | } | |
1da177e4 LT |
1815 | /* |
1816 | * Release the btree blocks and leaf block. | |
1817 | */ | |
1818 | for (i = 0; i < state->path.active; i++) { | |
1d9025e5 | 1819 | xfs_trans_brelse(args->trans, state->path.blk[i].bp); |
1da177e4 LT |
1820 | state->path.blk[i].bp = NULL; |
1821 | } | |
1822 | /* | |
1823 | * Release the data block if we have it. | |
1824 | */ | |
1825 | if (state->extravalid && state->extrablk.bp) { | |
1d9025e5 | 1826 | xfs_trans_brelse(args->trans, state->extrablk.bp); |
1da177e4 LT |
1827 | state->extrablk.bp = NULL; |
1828 | } | |
1829 | xfs_da_state_free(state); | |
1830 | return rval; | |
1831 | } | |
1832 | ||
1833 | /* | |
1834 | * Remove an entry from a node-format directory. | |
1835 | */ | |
1836 | int /* error */ | |
1837 | xfs_dir2_node_removename( | |
1838 | xfs_da_args_t *args) /* operation arguments */ | |
1839 | { | |
1840 | xfs_da_state_blk_t *blk; /* leaf block */ | |
1841 | int error; /* error return value */ | |
1842 | int rval; /* operation return value */ | |
1843 | xfs_da_state_t *state; /* btree cursor */ | |
1844 | ||
0b1b213f CH |
1845 | trace_xfs_dir2_node_removename(args); |
1846 | ||
1da177e4 LT |
1847 | /* |
1848 | * Allocate and initialize the btree cursor. | |
1849 | */ | |
1850 | state = xfs_da_state_alloc(); | |
1851 | state->args = args; | |
1852 | state->mp = args->dp->i_mount; | |
1853 | state->blocksize = state->mp->m_dirblksize; | |
1854 | state->node_ents = state->mp->m_dir_node_ents; | |
1855 | /* | |
1856 | * Look up the entry we're deleting, set up the cursor. | |
1857 | */ | |
1858 | error = xfs_da_node_lookup_int(state, &rval); | |
5163f95a | 1859 | if (error) |
1da177e4 | 1860 | rval = error; |
1da177e4 LT |
1861 | /* |
1862 | * Didn't find it, upper layer screwed up. | |
1863 | */ | |
1864 | if (rval != EEXIST) { | |
1865 | xfs_da_state_free(state); | |
1866 | return rval; | |
1867 | } | |
1868 | blk = &state->path.blk[state->path.active - 1]; | |
1869 | ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1870 | ASSERT(state->extravalid); | |
1871 | /* | |
1872 | * Remove the leaf and data entries. | |
1873 | * Extrablk refers to the data block. | |
1874 | */ | |
1875 | error = xfs_dir2_leafn_remove(args, blk->bp, blk->index, | |
1876 | &state->extrablk, &rval); | |
5163f95a | 1877 | if (error) |
1da177e4 | 1878 | return error; |
1da177e4 LT |
1879 | /* |
1880 | * Fix the hash values up the btree. | |
1881 | */ | |
1882 | xfs_da_fixhashpath(state, &state->path); | |
1883 | /* | |
1884 | * If we need to join leaf blocks, do it. | |
1885 | */ | |
1886 | if (rval && state->path.active > 1) | |
1887 | error = xfs_da_join(state); | |
1888 | /* | |
1889 | * If no errors so far, try conversion to leaf format. | |
1890 | */ | |
1891 | if (!error) | |
1892 | error = xfs_dir2_node_to_leaf(state); | |
1893 | xfs_da_state_free(state); | |
1894 | return error; | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * Replace an entry's inode number in a node-format directory. | |
1899 | */ | |
1900 | int /* error */ | |
1901 | xfs_dir2_node_replace( | |
1902 | xfs_da_args_t *args) /* operation arguments */ | |
1903 | { | |
1904 | xfs_da_state_blk_t *blk; /* leaf block */ | |
c2066e26 | 1905 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
1da177e4 LT |
1906 | xfs_dir2_data_entry_t *dep; /* data entry changed */ |
1907 | int error; /* error return value */ | |
1908 | int i; /* btree level */ | |
1909 | xfs_ino_t inum; /* new inode number */ | |
1910 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1911 | xfs_dir2_leaf_entry_t *lep; /* leaf entry being changed */ | |
1912 | int rval; /* internal return value */ | |
1913 | xfs_da_state_t *state; /* btree cursor */ | |
1914 | ||
0b1b213f CH |
1915 | trace_xfs_dir2_node_replace(args); |
1916 | ||
1da177e4 LT |
1917 | /* |
1918 | * Allocate and initialize the btree cursor. | |
1919 | */ | |
1920 | state = xfs_da_state_alloc(); | |
1921 | state->args = args; | |
1922 | state->mp = args->dp->i_mount; | |
1923 | state->blocksize = state->mp->m_dirblksize; | |
1924 | state->node_ents = state->mp->m_dir_node_ents; | |
1925 | inum = args->inumber; | |
1926 | /* | |
1927 | * Lookup the entry to change in the btree. | |
1928 | */ | |
1929 | error = xfs_da_node_lookup_int(state, &rval); | |
1930 | if (error) { | |
1931 | rval = error; | |
1932 | } | |
1933 | /* | |
1934 | * It should be found, since the vnodeops layer has looked it up | |
1935 | * and locked it. But paranoia is good. | |
1936 | */ | |
1937 | if (rval == EEXIST) { | |
1938 | /* | |
1939 | * Find the leaf entry. | |
1940 | */ | |
1941 | blk = &state->path.blk[state->path.active - 1]; | |
1942 | ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); | |
1d9025e5 | 1943 | leaf = blk->bp->b_addr; |
1da177e4 LT |
1944 | lep = &leaf->ents[blk->index]; |
1945 | ASSERT(state->extravalid); | |
1946 | /* | |
1947 | * Point to the data entry. | |
1948 | */ | |
1d9025e5 | 1949 | hdr = state->extrablk.bp->b_addr; |
69ef921b | 1950 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC)); |
1da177e4 | 1951 | dep = (xfs_dir2_data_entry_t *) |
c2066e26 | 1952 | ((char *)hdr + |
bbaaf538 | 1953 | xfs_dir2_dataptr_to_off(state->mp, be32_to_cpu(lep->address))); |
ff9901c1 | 1954 | ASSERT(inum != be64_to_cpu(dep->inumber)); |
1da177e4 LT |
1955 | /* |
1956 | * Fill in the new inode number and log the entry. | |
1957 | */ | |
ff9901c1 | 1958 | dep->inumber = cpu_to_be64(inum); |
1da177e4 LT |
1959 | xfs_dir2_data_log_entry(args->trans, state->extrablk.bp, dep); |
1960 | rval = 0; | |
1961 | } | |
1962 | /* | |
1963 | * Didn't find it, and we're holding a data block. Drop it. | |
1964 | */ | |
1965 | else if (state->extravalid) { | |
1d9025e5 | 1966 | xfs_trans_brelse(args->trans, state->extrablk.bp); |
1da177e4 LT |
1967 | state->extrablk.bp = NULL; |
1968 | } | |
1969 | /* | |
1970 | * Release all the buffers in the cursor. | |
1971 | */ | |
1972 | for (i = 0; i < state->path.active; i++) { | |
1d9025e5 | 1973 | xfs_trans_brelse(args->trans, state->path.blk[i].bp); |
1da177e4 LT |
1974 | state->path.blk[i].bp = NULL; |
1975 | } | |
1976 | xfs_da_state_free(state); | |
1977 | return rval; | |
1978 | } | |
1979 | ||
1980 | /* | |
1981 | * Trim off a trailing empty freespace block. | |
1982 | * Return (in rvalp) 1 if we did it, 0 if not. | |
1983 | */ | |
1984 | int /* error */ | |
1985 | xfs_dir2_node_trim_free( | |
1986 | xfs_da_args_t *args, /* operation arguments */ | |
1987 | xfs_fileoff_t fo, /* free block number */ | |
1988 | int *rvalp) /* out: did something */ | |
1989 | { | |
1d9025e5 | 1990 | struct xfs_buf *bp; /* freespace buffer */ |
1da177e4 LT |
1991 | xfs_inode_t *dp; /* incore directory inode */ |
1992 | int error; /* error return code */ | |
1993 | xfs_dir2_free_t *free; /* freespace structure */ | |
1994 | xfs_mount_t *mp; /* filesystem mount point */ | |
1995 | xfs_trans_t *tp; /* transaction pointer */ | |
1996 | ||
1997 | dp = args->dp; | |
1998 | mp = dp->i_mount; | |
1999 | tp = args->trans; | |
2000 | /* | |
2001 | * Read the freespace block. | |
2002 | */ | |
2025207c | 2003 | error = xfs_dir2_free_try_read(tp, dp, fo, &bp); |
4bb20a83 | 2004 | if (error) |
1da177e4 | 2005 | return error; |
1da177e4 LT |
2006 | /* |
2007 | * There can be holes in freespace. If fo is a hole, there's | |
2008 | * nothing to do. | |
2009 | */ | |
2025207c | 2010 | if (!bp) |
1da177e4 | 2011 | return 0; |
1d9025e5 | 2012 | free = bp->b_addr; |
69ef921b | 2013 | ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); |
1da177e4 LT |
2014 | /* |
2015 | * If there are used entries, there's nothing to do. | |
2016 | */ | |
0ba962ef | 2017 | if (be32_to_cpu(free->hdr.nused) > 0) { |
1d9025e5 | 2018 | xfs_trans_brelse(tp, bp); |
1da177e4 LT |
2019 | *rvalp = 0; |
2020 | return 0; | |
2021 | } | |
2022 | /* | |
2023 | * Blow the block away. | |
2024 | */ | |
2025 | if ((error = | |
bbaaf538 | 2026 | xfs_dir2_shrink_inode(args, xfs_dir2_da_to_db(mp, (xfs_dablk_t)fo), |
1da177e4 LT |
2027 | bp))) { |
2028 | /* | |
2029 | * Can't fail with ENOSPC since that only happens with no | |
2030 | * space reservation, when breaking up an extent into two | |
2031 | * pieces. This is the last block of an extent. | |
2032 | */ | |
2033 | ASSERT(error != ENOSPC); | |
1d9025e5 | 2034 | xfs_trans_brelse(tp, bp); |
1da177e4 LT |
2035 | return error; |
2036 | } | |
2037 | /* | |
2038 | * Return that we succeeded. | |
2039 | */ | |
2040 | *rvalp = 1; | |
2041 | return 0; | |
2042 | } |