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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | ||
33 | /* | |
34 | * xfs_dir2_leaf.c | |
35 | * XFS directory version 2 implementation - single leaf form | |
36 | * see xfs_dir2_leaf.h for data structures. | |
37 | * These directories have multiple XFS_DIR2_DATA blocks and one | |
38 | * XFS_DIR2_LEAF1 block containing the hash table and freespace map. | |
39 | */ | |
40 | ||
41 | #include "xfs.h" | |
42 | ||
43 | #include "xfs_macros.h" | |
44 | #include "xfs_types.h" | |
45 | #include "xfs_inum.h" | |
46 | #include "xfs_log.h" | |
47 | #include "xfs_trans.h" | |
48 | #include "xfs_sb.h" | |
49 | #include "xfs_ag.h" | |
50 | #include "xfs_dir.h" | |
51 | #include "xfs_dir2.h" | |
52 | #include "xfs_dmapi.h" | |
53 | #include "xfs_mount.h" | |
54 | #include "xfs_bmap_btree.h" | |
55 | #include "xfs_attr_sf.h" | |
56 | #include "xfs_dir_sf.h" | |
57 | #include "xfs_dir2_sf.h" | |
58 | #include "xfs_dinode.h" | |
59 | #include "xfs_inode.h" | |
60 | #include "xfs_bmap.h" | |
61 | #include "xfs_da_btree.h" | |
62 | #include "xfs_dir2_data.h" | |
63 | #include "xfs_dir2_leaf.h" | |
64 | #include "xfs_dir2_block.h" | |
65 | #include "xfs_dir2_node.h" | |
66 | #include "xfs_dir2_trace.h" | |
67 | #include "xfs_error.h" | |
68 | #include "xfs_bit.h" | |
69 | ||
70 | /* | |
71 | * Local function declarations. | |
72 | */ | |
73 | #ifdef DEBUG | |
74 | static void xfs_dir2_leaf_check(xfs_inode_t *dp, xfs_dabuf_t *bp); | |
75 | #else | |
76 | #define xfs_dir2_leaf_check(dp, bp) | |
77 | #endif | |
78 | static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **lbpp, | |
79 | int *indexp, xfs_dabuf_t **dbpp); | |
ba0f32d4 CH |
80 | static void xfs_dir2_leaf_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp, |
81 | int first, int last); | |
82 | extern void xfs_dir2_leaf_log_tail(struct xfs_trans *tp, struct xfs_dabuf *bp); | |
83 | ||
1da177e4 LT |
84 | |
85 | /* | |
86 | * Convert a block form directory to a leaf form directory. | |
87 | */ | |
88 | int /* error */ | |
89 | xfs_dir2_block_to_leaf( | |
90 | xfs_da_args_t *args, /* operation arguments */ | |
91 | xfs_dabuf_t *dbp) /* input block's buffer */ | |
92 | { | |
93 | xfs_dir2_data_off_t *bestsp; /* leaf's bestsp entries */ | |
94 | xfs_dablk_t blkno; /* leaf block's bno */ | |
95 | xfs_dir2_block_t *block; /* block structure */ | |
96 | xfs_dir2_leaf_entry_t *blp; /* block's leaf entries */ | |
97 | xfs_dir2_block_tail_t *btp; /* block's tail */ | |
98 | xfs_inode_t *dp; /* incore directory inode */ | |
99 | int error; /* error return code */ | |
100 | xfs_dabuf_t *lbp; /* leaf block's buffer */ | |
101 | xfs_dir2_db_t ldb; /* leaf block's bno */ | |
102 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
103 | xfs_dir2_leaf_tail_t *ltp; /* leaf's tail */ | |
104 | xfs_mount_t *mp; /* filesystem mount point */ | |
105 | int needlog; /* need to log block header */ | |
106 | int needscan; /* need to rescan bestfree */ | |
107 | xfs_trans_t *tp; /* transaction pointer */ | |
108 | ||
109 | xfs_dir2_trace_args_b("block_to_leaf", args, dbp); | |
110 | dp = args->dp; | |
111 | mp = dp->i_mount; | |
112 | tp = args->trans; | |
113 | /* | |
114 | * Add the leaf block to the inode. | |
115 | * This interface will only put blocks in the leaf/node range. | |
116 | * Since that's empty now, we'll get the root (block 0 in range). | |
117 | */ | |
118 | if ((error = xfs_da_grow_inode(args, &blkno))) { | |
119 | return error; | |
120 | } | |
121 | ldb = XFS_DIR2_DA_TO_DB(mp, blkno); | |
122 | ASSERT(ldb == XFS_DIR2_LEAF_FIRSTDB(mp)); | |
123 | /* | |
124 | * Initialize the leaf block, get a buffer for it. | |
125 | */ | |
126 | if ((error = xfs_dir2_leaf_init(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC))) { | |
127 | return error; | |
128 | } | |
129 | ASSERT(lbp != NULL); | |
130 | leaf = lbp->data; | |
131 | block = dbp->data; | |
132 | xfs_dir2_data_check(dp, dbp); | |
133 | btp = XFS_DIR2_BLOCK_TAIL_P(mp, block); | |
134 | blp = XFS_DIR2_BLOCK_LEAF_P(btp); | |
135 | /* | |
136 | * Set the counts in the leaf header. | |
137 | */ | |
138 | INT_COPY(leaf->hdr.count, btp->count, ARCH_CONVERT); /* INT_: type change */ | |
139 | INT_COPY(leaf->hdr.stale, btp->stale, ARCH_CONVERT); /* INT_: type change */ | |
140 | /* | |
141 | * Could compact these but I think we always do the conversion | |
142 | * after squeezing out stale entries. | |
143 | */ | |
144 | memcpy(leaf->ents, blp, INT_GET(btp->count, ARCH_CONVERT) * sizeof(xfs_dir2_leaf_entry_t)); | |
145 | xfs_dir2_leaf_log_ents(tp, lbp, 0, INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1); | |
146 | needscan = 0; | |
147 | needlog = 1; | |
148 | /* | |
149 | * Make the space formerly occupied by the leaf entries and block | |
150 | * tail be free. | |
151 | */ | |
152 | xfs_dir2_data_make_free(tp, dbp, | |
153 | (xfs_dir2_data_aoff_t)((char *)blp - (char *)block), | |
154 | (xfs_dir2_data_aoff_t)((char *)block + mp->m_dirblksize - | |
155 | (char *)blp), | |
156 | &needlog, &needscan); | |
157 | /* | |
158 | * Fix up the block header, make it a data block. | |
159 | */ | |
160 | INT_SET(block->hdr.magic, ARCH_CONVERT, XFS_DIR2_DATA_MAGIC); | |
161 | if (needscan) | |
162 | xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog, | |
163 | NULL); | |
164 | /* | |
165 | * Set up leaf tail and bests table. | |
166 | */ | |
167 | ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); | |
168 | INT_SET(ltp->bestcount, ARCH_CONVERT, 1); | |
169 | bestsp = XFS_DIR2_LEAF_BESTS_P(ltp); | |
170 | INT_COPY(bestsp[0], block->hdr.bestfree[0].length, ARCH_CONVERT); | |
171 | /* | |
172 | * Log the data header and leaf bests table. | |
173 | */ | |
174 | if (needlog) | |
175 | xfs_dir2_data_log_header(tp, dbp); | |
176 | xfs_dir2_leaf_check(dp, lbp); | |
177 | xfs_dir2_data_check(dp, dbp); | |
178 | xfs_dir2_leaf_log_bests(tp, lbp, 0, 0); | |
179 | xfs_da_buf_done(lbp); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Add an entry to a leaf form directory. | |
185 | */ | |
186 | int /* error */ | |
187 | xfs_dir2_leaf_addname( | |
188 | xfs_da_args_t *args) /* operation arguments */ | |
189 | { | |
190 | xfs_dir2_data_off_t *bestsp; /* freespace table in leaf */ | |
191 | int compact; /* need to compact leaves */ | |
192 | xfs_dir2_data_t *data; /* data block structure */ | |
193 | xfs_dabuf_t *dbp; /* data block buffer */ | |
194 | xfs_dir2_data_entry_t *dep; /* data block entry */ | |
195 | xfs_inode_t *dp; /* incore directory inode */ | |
196 | xfs_dir2_data_unused_t *dup; /* data unused entry */ | |
197 | int error; /* error return value */ | |
198 | int grown; /* allocated new data block */ | |
199 | int highstale; /* index of next stale leaf */ | |
200 | int i; /* temporary, index */ | |
201 | int index; /* leaf table position */ | |
202 | xfs_dabuf_t *lbp; /* leaf's buffer */ | |
203 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
204 | int length; /* length of new entry */ | |
205 | xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */ | |
206 | int lfloglow; /* low leaf logging index */ | |
207 | int lfloghigh; /* high leaf logging index */ | |
208 | int lowstale; /* index of prev stale leaf */ | |
209 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */ | |
210 | xfs_mount_t *mp; /* filesystem mount point */ | |
211 | int needbytes; /* leaf block bytes needed */ | |
212 | int needlog; /* need to log data header */ | |
213 | int needscan; /* need to rescan data free */ | |
214 | xfs_dir2_data_off_t *tagp; /* end of data entry */ | |
215 | xfs_trans_t *tp; /* transaction pointer */ | |
216 | xfs_dir2_db_t use_block; /* data block number */ | |
217 | ||
218 | xfs_dir2_trace_args("leaf_addname", args); | |
219 | dp = args->dp; | |
220 | tp = args->trans; | |
221 | mp = dp->i_mount; | |
222 | /* | |
223 | * Read the leaf block. | |
224 | */ | |
225 | error = xfs_da_read_buf(tp, dp, mp->m_dirleafblk, -1, &lbp, | |
226 | XFS_DATA_FORK); | |
227 | if (error) { | |
228 | return error; | |
229 | } | |
230 | ASSERT(lbp != NULL); | |
231 | /* | |
232 | * Look up the entry by hash value and name. | |
233 | * We know it's not there, our caller has already done a lookup. | |
234 | * So the index is of the entry to insert in front of. | |
235 | * But if there are dup hash values the index is of the first of those. | |
236 | */ | |
237 | index = xfs_dir2_leaf_search_hash(args, lbp); | |
238 | leaf = lbp->data; | |
239 | ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); | |
240 | bestsp = XFS_DIR2_LEAF_BESTS_P(ltp); | |
241 | length = XFS_DIR2_DATA_ENTSIZE(args->namelen); | |
242 | /* | |
243 | * See if there are any entries with the same hash value | |
244 | * and space in their block for the new entry. | |
245 | * This is good because it puts multiple same-hash value entries | |
246 | * in a data block, improving the lookup of those entries. | |
247 | */ | |
248 | for (use_block = -1, lep = &leaf->ents[index]; | |
249 | index < INT_GET(leaf->hdr.count, ARCH_CONVERT) && INT_GET(lep->hashval, ARCH_CONVERT) == args->hashval; | |
250 | index++, lep++) { | |
251 | if (INT_GET(lep->address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) | |
252 | continue; | |
253 | i = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT)); | |
254 | ASSERT(i < INT_GET(ltp->bestcount, ARCH_CONVERT)); | |
255 | ASSERT(INT_GET(bestsp[i], ARCH_CONVERT) != NULLDATAOFF); | |
256 | if (INT_GET(bestsp[i], ARCH_CONVERT) >= length) { | |
257 | use_block = i; | |
258 | break; | |
259 | } | |
260 | } | |
261 | /* | |
262 | * Didn't find a block yet, linear search all the data blocks. | |
263 | */ | |
264 | if (use_block == -1) { | |
265 | for (i = 0; i < INT_GET(ltp->bestcount, ARCH_CONVERT); i++) { | |
266 | /* | |
267 | * Remember a block we see that's missing. | |
268 | */ | |
269 | if (INT_GET(bestsp[i], ARCH_CONVERT) == NULLDATAOFF && use_block == -1) | |
270 | use_block = i; | |
271 | else if (INT_GET(bestsp[i], ARCH_CONVERT) >= length) { | |
272 | use_block = i; | |
273 | break; | |
274 | } | |
275 | } | |
276 | } | |
277 | /* | |
278 | * How many bytes do we need in the leaf block? | |
279 | */ | |
280 | needbytes = | |
281 | (leaf->hdr.stale ? 0 : (uint)sizeof(leaf->ents[0])) + | |
282 | (use_block != -1 ? 0 : (uint)sizeof(leaf->bests[0])); | |
283 | /* | |
284 | * Now kill use_block if it refers to a missing block, so we | |
285 | * can use it as an indication of allocation needed. | |
286 | */ | |
287 | if (use_block != -1 && INT_GET(bestsp[use_block], ARCH_CONVERT) == NULLDATAOFF) | |
288 | use_block = -1; | |
289 | /* | |
290 | * If we don't have enough free bytes but we can make enough | |
291 | * by compacting out stale entries, we'll do that. | |
292 | */ | |
293 | if ((char *)bestsp - (char *)&leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT)] < needbytes && | |
294 | INT_GET(leaf->hdr.stale, ARCH_CONVERT) > 1) { | |
295 | compact = 1; | |
296 | } | |
297 | /* | |
298 | * Otherwise if we don't have enough free bytes we need to | |
299 | * convert to node form. | |
300 | */ | |
301 | else if ((char *)bestsp - (char *)&leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT)] < | |
302 | needbytes) { | |
303 | /* | |
304 | * Just checking or no space reservation, give up. | |
305 | */ | |
306 | if (args->justcheck || args->total == 0) { | |
307 | xfs_da_brelse(tp, lbp); | |
308 | return XFS_ERROR(ENOSPC); | |
309 | } | |
310 | /* | |
311 | * Convert to node form. | |
312 | */ | |
313 | error = xfs_dir2_leaf_to_node(args, lbp); | |
314 | xfs_da_buf_done(lbp); | |
315 | if (error) | |
316 | return error; | |
317 | /* | |
318 | * Then add the new entry. | |
319 | */ | |
320 | return xfs_dir2_node_addname(args); | |
321 | } | |
322 | /* | |
323 | * Otherwise it will fit without compaction. | |
324 | */ | |
325 | else | |
326 | compact = 0; | |
327 | /* | |
328 | * If just checking, then it will fit unless we needed to allocate | |
329 | * a new data block. | |
330 | */ | |
331 | if (args->justcheck) { | |
332 | xfs_da_brelse(tp, lbp); | |
333 | return use_block == -1 ? XFS_ERROR(ENOSPC) : 0; | |
334 | } | |
335 | /* | |
336 | * If no allocations are allowed, return now before we've | |
337 | * changed anything. | |
338 | */ | |
339 | if (args->total == 0 && use_block == -1) { | |
340 | xfs_da_brelse(tp, lbp); | |
341 | return XFS_ERROR(ENOSPC); | |
342 | } | |
343 | /* | |
344 | * Need to compact the leaf entries, removing stale ones. | |
345 | * Leave one stale entry behind - the one closest to our | |
346 | * insertion index - and we'll shift that one to our insertion | |
347 | * point later. | |
348 | */ | |
349 | if (compact) { | |
350 | xfs_dir2_leaf_compact_x1(lbp, &index, &lowstale, &highstale, | |
351 | &lfloglow, &lfloghigh); | |
352 | } | |
353 | /* | |
354 | * There are stale entries, so we'll need log-low and log-high | |
355 | * impossibly bad values later. | |
356 | */ | |
357 | else if (INT_GET(leaf->hdr.stale, ARCH_CONVERT)) { | |
358 | lfloglow = INT_GET(leaf->hdr.count, ARCH_CONVERT); | |
359 | lfloghigh = -1; | |
360 | } | |
361 | /* | |
362 | * If there was no data block space found, we need to allocate | |
363 | * a new one. | |
364 | */ | |
365 | if (use_block == -1) { | |
366 | /* | |
367 | * Add the new data block. | |
368 | */ | |
369 | if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, | |
370 | &use_block))) { | |
371 | xfs_da_brelse(tp, lbp); | |
372 | return error; | |
373 | } | |
374 | /* | |
375 | * Initialize the block. | |
376 | */ | |
377 | if ((error = xfs_dir2_data_init(args, use_block, &dbp))) { | |
378 | xfs_da_brelse(tp, lbp); | |
379 | return error; | |
380 | } | |
381 | /* | |
382 | * If we're adding a new data block on the end we need to | |
383 | * extend the bests table. Copy it up one entry. | |
384 | */ | |
385 | if (use_block >= INT_GET(ltp->bestcount, ARCH_CONVERT)) { | |
386 | bestsp--; | |
387 | memmove(&bestsp[0], &bestsp[1], | |
388 | INT_GET(ltp->bestcount, ARCH_CONVERT) * sizeof(bestsp[0])); | |
389 | INT_MOD(ltp->bestcount, ARCH_CONVERT, +1); | |
390 | xfs_dir2_leaf_log_tail(tp, lbp); | |
391 | xfs_dir2_leaf_log_bests(tp, lbp, 0, INT_GET(ltp->bestcount, ARCH_CONVERT) - 1); | |
392 | } | |
393 | /* | |
394 | * If we're filling in a previously empty block just log it. | |
395 | */ | |
396 | else | |
397 | xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block); | |
398 | data = dbp->data; | |
399 | INT_COPY(bestsp[use_block], data->hdr.bestfree[0].length, ARCH_CONVERT); | |
400 | grown = 1; | |
401 | } | |
402 | /* | |
403 | * Already had space in some data block. | |
404 | * Just read that one in. | |
405 | */ | |
406 | else { | |
407 | if ((error = | |
408 | xfs_da_read_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, use_block), | |
409 | -1, &dbp, XFS_DATA_FORK))) { | |
410 | xfs_da_brelse(tp, lbp); | |
411 | return error; | |
412 | } | |
413 | data = dbp->data; | |
414 | grown = 0; | |
415 | } | |
416 | xfs_dir2_data_check(dp, dbp); | |
417 | /* | |
418 | * Point to the biggest freespace in our data block. | |
419 | */ | |
420 | dup = (xfs_dir2_data_unused_t *) | |
421 | ((char *)data + INT_GET(data->hdr.bestfree[0].offset, ARCH_CONVERT)); | |
422 | ASSERT(INT_GET(dup->length, ARCH_CONVERT) >= length); | |
423 | needscan = needlog = 0; | |
424 | /* | |
425 | * Mark the initial part of our freespace in use for the new entry. | |
426 | */ | |
427 | xfs_dir2_data_use_free(tp, dbp, dup, | |
428 | (xfs_dir2_data_aoff_t)((char *)dup - (char *)data), length, | |
429 | &needlog, &needscan); | |
430 | /* | |
431 | * Initialize our new entry (at last). | |
432 | */ | |
433 | dep = (xfs_dir2_data_entry_t *)dup; | |
434 | INT_SET(dep->inumber, ARCH_CONVERT, args->inumber); | |
435 | dep->namelen = args->namelen; | |
436 | memcpy(dep->name, args->name, dep->namelen); | |
437 | tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep); | |
438 | INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)data)); | |
439 | /* | |
440 | * Need to scan fix up the bestfree table. | |
441 | */ | |
442 | if (needscan) | |
443 | xfs_dir2_data_freescan(mp, data, &needlog, NULL); | |
444 | /* | |
445 | * Need to log the data block's header. | |
446 | */ | |
447 | if (needlog) | |
448 | xfs_dir2_data_log_header(tp, dbp); | |
449 | xfs_dir2_data_log_entry(tp, dbp, dep); | |
450 | /* | |
451 | * If the bests table needs to be changed, do it. | |
452 | * Log the change unless we've already done that. | |
453 | */ | |
454 | if (INT_GET(bestsp[use_block], ARCH_CONVERT) != INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT)) { | |
455 | INT_COPY(bestsp[use_block], data->hdr.bestfree[0].length, ARCH_CONVERT); | |
456 | if (!grown) | |
457 | xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block); | |
458 | } | |
459 | /* | |
460 | * Now we need to make room to insert the leaf entry. | |
461 | * If there are no stale entries, we just insert a hole at index. | |
462 | */ | |
463 | if (!leaf->hdr.stale) { | |
464 | /* | |
465 | * lep is still good as the index leaf entry. | |
466 | */ | |
467 | if (index < INT_GET(leaf->hdr.count, ARCH_CONVERT)) | |
468 | memmove(lep + 1, lep, | |
469 | (INT_GET(leaf->hdr.count, ARCH_CONVERT) - index) * sizeof(*lep)); | |
470 | /* | |
471 | * Record low and high logging indices for the leaf. | |
472 | */ | |
473 | lfloglow = index; | |
474 | lfloghigh = INT_GET(leaf->hdr.count, ARCH_CONVERT); | |
475 | INT_MOD(leaf->hdr.count, ARCH_CONVERT, +1); | |
476 | } | |
477 | /* | |
478 | * There are stale entries. | |
479 | * We will use one of them for the new entry. | |
480 | * It's probably not at the right location, so we'll have to | |
481 | * shift some up or down first. | |
482 | */ | |
483 | else { | |
484 | /* | |
485 | * If we didn't compact before, we need to find the nearest | |
486 | * stale entries before and after our insertion point. | |
487 | */ | |
488 | if (compact == 0) { | |
489 | /* | |
490 | * Find the first stale entry before the insertion | |
491 | * point, if any. | |
492 | */ | |
493 | for (lowstale = index - 1; | |
494 | lowstale >= 0 && | |
495 | INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) != | |
496 | XFS_DIR2_NULL_DATAPTR; | |
497 | lowstale--) | |
498 | continue; | |
499 | /* | |
500 | * Find the next stale entry at or after the insertion | |
501 | * point, if any. Stop if we go so far that the | |
502 | * lowstale entry would be better. | |
503 | */ | |
504 | for (highstale = index; | |
505 | highstale < INT_GET(leaf->hdr.count, ARCH_CONVERT) && | |
506 | INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) != | |
507 | XFS_DIR2_NULL_DATAPTR && | |
508 | (lowstale < 0 || | |
509 | index - lowstale - 1 >= highstale - index); | |
510 | highstale++) | |
511 | continue; | |
512 | } | |
513 | /* | |
514 | * If the low one is better, use it. | |
515 | */ | |
516 | if (lowstale >= 0 && | |
517 | (highstale == INT_GET(leaf->hdr.count, ARCH_CONVERT) || | |
518 | index - lowstale - 1 < highstale - index)) { | |
519 | ASSERT(index - lowstale - 1 >= 0); | |
520 | ASSERT(INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) == | |
521 | XFS_DIR2_NULL_DATAPTR); | |
522 | /* | |
523 | * Copy entries up to cover the stale entry | |
524 | * and make room for the new entry. | |
525 | */ | |
526 | if (index - lowstale - 1 > 0) | |
527 | memmove(&leaf->ents[lowstale], | |
528 | &leaf->ents[lowstale + 1], | |
529 | (index - lowstale - 1) * sizeof(*lep)); | |
530 | lep = &leaf->ents[index - 1]; | |
531 | lfloglow = MIN(lowstale, lfloglow); | |
532 | lfloghigh = MAX(index - 1, lfloghigh); | |
533 | } | |
534 | /* | |
535 | * The high one is better, so use that one. | |
536 | */ | |
537 | else { | |
538 | ASSERT(highstale - index >= 0); | |
539 | ASSERT(INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) == | |
540 | XFS_DIR2_NULL_DATAPTR); | |
541 | /* | |
542 | * Copy entries down to copver the stale entry | |
543 | * and make room for the new entry. | |
544 | */ | |
545 | if (highstale - index > 0) | |
546 | memmove(&leaf->ents[index + 1], | |
547 | &leaf->ents[index], | |
548 | (highstale - index) * sizeof(*lep)); | |
549 | lep = &leaf->ents[index]; | |
550 | lfloglow = MIN(index, lfloglow); | |
551 | lfloghigh = MAX(highstale, lfloghigh); | |
552 | } | |
553 | INT_MOD(leaf->hdr.stale, ARCH_CONVERT, -1); | |
554 | } | |
555 | /* | |
556 | * Fill in the new leaf entry. | |
557 | */ | |
558 | INT_SET(lep->hashval, ARCH_CONVERT, args->hashval); | |
559 | INT_SET(lep->address, ARCH_CONVERT, XFS_DIR2_DB_OFF_TO_DATAPTR(mp, use_block, INT_GET(*tagp, ARCH_CONVERT))); | |
560 | /* | |
561 | * Log the leaf fields and give up the buffers. | |
562 | */ | |
563 | xfs_dir2_leaf_log_header(tp, lbp); | |
564 | xfs_dir2_leaf_log_ents(tp, lbp, lfloglow, lfloghigh); | |
565 | xfs_dir2_leaf_check(dp, lbp); | |
566 | xfs_da_buf_done(lbp); | |
567 | xfs_dir2_data_check(dp, dbp); | |
568 | xfs_da_buf_done(dbp); | |
569 | return 0; | |
570 | } | |
571 | ||
572 | #ifdef DEBUG | |
573 | /* | |
574 | * Check the internal consistency of a leaf1 block. | |
575 | * Pop an assert if something is wrong. | |
576 | */ | |
577 | void | |
578 | xfs_dir2_leaf_check( | |
579 | xfs_inode_t *dp, /* incore directory inode */ | |
580 | xfs_dabuf_t *bp) /* leaf's buffer */ | |
581 | { | |
582 | int i; /* leaf index */ | |
583 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
584 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */ | |
585 | xfs_mount_t *mp; /* filesystem mount point */ | |
586 | int stale; /* count of stale leaves */ | |
587 | ||
588 | leaf = bp->data; | |
589 | mp = dp->i_mount; | |
590 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC); | |
591 | /* | |
592 | * This value is not restrictive enough. | |
593 | * Should factor in the size of the bests table as well. | |
594 | * We can deduce a value for that from di_size. | |
595 | */ | |
596 | ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) <= XFS_DIR2_MAX_LEAF_ENTS(mp)); | |
597 | ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); | |
598 | /* | |
599 | * Leaves and bests don't overlap. | |
600 | */ | |
601 | ASSERT((char *)&leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT)] <= | |
602 | (char *)XFS_DIR2_LEAF_BESTS_P(ltp)); | |
603 | /* | |
604 | * Check hash value order, count stale entries. | |
605 | */ | |
606 | for (i = stale = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); i++) { | |
607 | if (i + 1 < INT_GET(leaf->hdr.count, ARCH_CONVERT)) | |
608 | ASSERT(INT_GET(leaf->ents[i].hashval, ARCH_CONVERT) <= | |
609 | INT_GET(leaf->ents[i + 1].hashval, ARCH_CONVERT)); | |
610 | if (INT_GET(leaf->ents[i].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) | |
611 | stale++; | |
612 | } | |
613 | ASSERT(INT_GET(leaf->hdr.stale, ARCH_CONVERT) == stale); | |
614 | } | |
615 | #endif /* DEBUG */ | |
616 | ||
617 | /* | |
618 | * Compact out any stale entries in the leaf. | |
619 | * Log the header and changed leaf entries, if any. | |
620 | */ | |
621 | void | |
622 | xfs_dir2_leaf_compact( | |
623 | xfs_da_args_t *args, /* operation arguments */ | |
624 | xfs_dabuf_t *bp) /* leaf buffer */ | |
625 | { | |
626 | int from; /* source leaf index */ | |
627 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
628 | int loglow; /* first leaf entry to log */ | |
629 | int to; /* target leaf index */ | |
630 | ||
631 | leaf = bp->data; | |
632 | if (!leaf->hdr.stale) { | |
633 | return; | |
634 | } | |
635 | /* | |
636 | * Compress out the stale entries in place. | |
637 | */ | |
638 | for (from = to = 0, loglow = -1; from < INT_GET(leaf->hdr.count, ARCH_CONVERT); from++) { | |
639 | if (INT_GET(leaf->ents[from].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) | |
640 | continue; | |
641 | /* | |
642 | * Only actually copy the entries that are different. | |
643 | */ | |
644 | if (from > to) { | |
645 | if (loglow == -1) | |
646 | loglow = to; | |
647 | leaf->ents[to] = leaf->ents[from]; | |
648 | } | |
649 | to++; | |
650 | } | |
651 | /* | |
652 | * Update and log the header, log the leaf entries. | |
653 | */ | |
654 | ASSERT(INT_GET(leaf->hdr.stale, ARCH_CONVERT) == from - to); | |
655 | INT_MOD(leaf->hdr.count, ARCH_CONVERT, -(INT_GET(leaf->hdr.stale, ARCH_CONVERT))); | |
656 | leaf->hdr.stale = 0; | |
657 | xfs_dir2_leaf_log_header(args->trans, bp); | |
658 | if (loglow != -1) | |
659 | xfs_dir2_leaf_log_ents(args->trans, bp, loglow, to - 1); | |
660 | } | |
661 | ||
662 | /* | |
663 | * Compact the leaf entries, removing stale ones. | |
664 | * Leave one stale entry behind - the one closest to our | |
665 | * insertion index - and the caller will shift that one to our insertion | |
666 | * point later. | |
667 | * Return new insertion index, where the remaining stale entry is, | |
668 | * and leaf logging indices. | |
669 | */ | |
670 | void | |
671 | xfs_dir2_leaf_compact_x1( | |
672 | xfs_dabuf_t *bp, /* leaf buffer */ | |
673 | int *indexp, /* insertion index */ | |
674 | int *lowstalep, /* out: stale entry before us */ | |
675 | int *highstalep, /* out: stale entry after us */ | |
676 | int *lowlogp, /* out: low log index */ | |
677 | int *highlogp) /* out: high log index */ | |
678 | { | |
679 | int from; /* source copy index */ | |
680 | int highstale; /* stale entry at/after index */ | |
681 | int index; /* insertion index */ | |
682 | int keepstale; /* source index of kept stale */ | |
683 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
684 | int lowstale; /* stale entry before index */ | |
685 | int newindex=0; /* new insertion index */ | |
686 | int to; /* destination copy index */ | |
687 | ||
688 | leaf = bp->data; | |
689 | ASSERT(INT_GET(leaf->hdr.stale, ARCH_CONVERT) > 1); | |
690 | index = *indexp; | |
691 | /* | |
692 | * Find the first stale entry before our index, if any. | |
693 | */ | |
694 | for (lowstale = index - 1; | |
695 | lowstale >= 0 && | |
696 | INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) != XFS_DIR2_NULL_DATAPTR; | |
697 | lowstale--) | |
698 | continue; | |
699 | /* | |
700 | * Find the first stale entry at or after our index, if any. | |
701 | * Stop if the answer would be worse than lowstale. | |
702 | */ | |
703 | for (highstale = index; | |
704 | highstale < INT_GET(leaf->hdr.count, ARCH_CONVERT) && | |
705 | INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) != XFS_DIR2_NULL_DATAPTR && | |
706 | (lowstale < 0 || index - lowstale > highstale - index); | |
707 | highstale++) | |
708 | continue; | |
709 | /* | |
710 | * Pick the better of lowstale and highstale. | |
711 | */ | |
712 | if (lowstale >= 0 && | |
713 | (highstale == INT_GET(leaf->hdr.count, ARCH_CONVERT) || | |
714 | index - lowstale <= highstale - index)) | |
715 | keepstale = lowstale; | |
716 | else | |
717 | keepstale = highstale; | |
718 | /* | |
719 | * Copy the entries in place, removing all the stale entries | |
720 | * except keepstale. | |
721 | */ | |
722 | for (from = to = 0; from < INT_GET(leaf->hdr.count, ARCH_CONVERT); from++) { | |
723 | /* | |
724 | * Notice the new value of index. | |
725 | */ | |
726 | if (index == from) | |
727 | newindex = to; | |
728 | if (from != keepstale && | |
729 | INT_GET(leaf->ents[from].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) { | |
730 | if (from == to) | |
731 | *lowlogp = to; | |
732 | continue; | |
733 | } | |
734 | /* | |
735 | * Record the new keepstale value for the insertion. | |
736 | */ | |
737 | if (from == keepstale) | |
738 | lowstale = highstale = to; | |
739 | /* | |
740 | * Copy only the entries that have moved. | |
741 | */ | |
742 | if (from > to) | |
743 | leaf->ents[to] = leaf->ents[from]; | |
744 | to++; | |
745 | } | |
746 | ASSERT(from > to); | |
747 | /* | |
748 | * If the insertion point was past the last entry, | |
749 | * set the new insertion point accordingly. | |
750 | */ | |
751 | if (index == from) | |
752 | newindex = to; | |
753 | *indexp = newindex; | |
754 | /* | |
755 | * Adjust the leaf header values. | |
756 | */ | |
757 | INT_MOD(leaf->hdr.count, ARCH_CONVERT, -(from - to)); | |
758 | INT_SET(leaf->hdr.stale, ARCH_CONVERT, 1); | |
759 | /* | |
760 | * Remember the low/high stale value only in the "right" | |
761 | * direction. | |
762 | */ | |
763 | if (lowstale >= newindex) | |
764 | lowstale = -1; | |
765 | else | |
766 | highstale = INT_GET(leaf->hdr.count, ARCH_CONVERT); | |
767 | *highlogp = INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1; | |
768 | *lowstalep = lowstale; | |
769 | *highstalep = highstale; | |
770 | } | |
771 | ||
772 | /* | |
773 | * Getdents (readdir) for leaf and node directories. | |
774 | * This reads the data blocks only, so is the same for both forms. | |
775 | */ | |
776 | int /* error */ | |
777 | xfs_dir2_leaf_getdents( | |
778 | xfs_trans_t *tp, /* transaction pointer */ | |
779 | xfs_inode_t *dp, /* incore directory inode */ | |
780 | uio_t *uio, /* I/O control & vectors */ | |
781 | int *eofp, /* out: reached end of dir */ | |
782 | xfs_dirent_t *dbp, /* caller's buffer */ | |
783 | xfs_dir2_put_t put) /* ABI formatting routine */ | |
784 | { | |
785 | xfs_dabuf_t *bp; /* data block buffer */ | |
786 | int byteoff; /* offset in current block */ | |
787 | xfs_dir2_db_t curdb; /* db for current block */ | |
788 | xfs_dir2_off_t curoff; /* current overall offset */ | |
789 | xfs_dir2_data_t *data; /* data block structure */ | |
790 | xfs_dir2_data_entry_t *dep; /* data entry */ | |
791 | xfs_dir2_data_unused_t *dup; /* unused entry */ | |
792 | int eof; /* reached end of directory */ | |
793 | int error=0; /* error return value */ | |
794 | int i; /* temporary loop index */ | |
795 | int j; /* temporary loop index */ | |
796 | int length; /* temporary length value */ | |
797 | xfs_bmbt_irec_t *map; /* map vector for blocks */ | |
798 | xfs_extlen_t map_blocks; /* number of fsbs in map */ | |
799 | xfs_dablk_t map_off; /* last mapped file offset */ | |
800 | int map_size; /* total entries in *map */ | |
801 | int map_valid; /* valid entries in *map */ | |
802 | xfs_mount_t *mp; /* filesystem mount point */ | |
803 | xfs_dir2_off_t newoff; /* new curoff after new blk */ | |
804 | int nmap; /* mappings to ask xfs_bmapi */ | |
805 | xfs_dir2_put_args_t p; /* formatting arg bundle */ | |
806 | char *ptr=NULL; /* pointer to current data */ | |
807 | int ra_current; /* number of read-ahead blks */ | |
808 | int ra_index; /* *map index for read-ahead */ | |
809 | int ra_offset; /* map entry offset for ra */ | |
810 | int ra_want; /* readahead count wanted */ | |
811 | ||
812 | /* | |
813 | * If the offset is at or past the largest allowed value, | |
814 | * give up right away, return eof. | |
815 | */ | |
816 | if (uio->uio_offset >= XFS_DIR2_MAX_DATAPTR) { | |
817 | *eofp = 1; | |
818 | return 0; | |
819 | } | |
820 | mp = dp->i_mount; | |
821 | /* | |
822 | * Setup formatting arguments. | |
823 | */ | |
824 | p.dbp = dbp; | |
825 | p.put = put; | |
826 | p.uio = uio; | |
827 | /* | |
828 | * Set up to bmap a number of blocks based on the caller's | |
829 | * buffer size, the directory block size, and the filesystem | |
830 | * block size. | |
831 | */ | |
832 | map_size = | |
833 | howmany(uio->uio_resid + mp->m_dirblksize, | |
834 | mp->m_sb.sb_blocksize); | |
835 | map = kmem_alloc(map_size * sizeof(*map), KM_SLEEP); | |
836 | map_valid = ra_index = ra_offset = ra_current = map_blocks = 0; | |
837 | bp = NULL; | |
838 | eof = 1; | |
839 | /* | |
840 | * Inside the loop we keep the main offset value as a byte offset | |
841 | * in the directory file. | |
842 | */ | |
843 | curoff = XFS_DIR2_DATAPTR_TO_BYTE(mp, uio->uio_offset); | |
844 | /* | |
845 | * Force this conversion through db so we truncate the offset | |
846 | * down to get the start of the data block. | |
847 | */ | |
848 | map_off = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, curoff)); | |
849 | /* | |
850 | * Loop over directory entries until we reach the end offset. | |
851 | * Get more blocks and readahead as necessary. | |
852 | */ | |
853 | while (curoff < XFS_DIR2_LEAF_OFFSET) { | |
854 | /* | |
855 | * If we have no buffer, or we're off the end of the | |
856 | * current buffer, need to get another one. | |
857 | */ | |
858 | if (!bp || ptr >= (char *)bp->data + mp->m_dirblksize) { | |
859 | /* | |
860 | * If we have a buffer, we need to release it and | |
861 | * take it out of the mapping. | |
862 | */ | |
863 | if (bp) { | |
864 | xfs_da_brelse(tp, bp); | |
865 | bp = NULL; | |
866 | map_blocks -= mp->m_dirblkfsbs; | |
867 | /* | |
868 | * Loop to get rid of the extents for the | |
869 | * directory block. | |
870 | */ | |
871 | for (i = mp->m_dirblkfsbs; i > 0; ) { | |
872 | j = MIN((int)map->br_blockcount, i); | |
873 | map->br_blockcount -= j; | |
874 | map->br_startblock += j; | |
875 | map->br_startoff += j; | |
876 | /* | |
877 | * If mapping is done, pitch it from | |
878 | * the table. | |
879 | */ | |
880 | if (!map->br_blockcount && --map_valid) | |
881 | memmove(&map[0], &map[1], | |
882 | sizeof(map[0]) * | |
883 | map_valid); | |
884 | i -= j; | |
885 | } | |
886 | } | |
887 | /* | |
888 | * Recalculate the readahead blocks wanted. | |
889 | */ | |
890 | ra_want = howmany(uio->uio_resid + mp->m_dirblksize, | |
891 | mp->m_sb.sb_blocksize) - 1; | |
892 | /* | |
893 | * If we don't have as many as we want, and we haven't | |
894 | * run out of data blocks, get some more mappings. | |
895 | */ | |
896 | if (1 + ra_want > map_blocks && | |
897 | map_off < | |
898 | XFS_DIR2_BYTE_TO_DA(mp, XFS_DIR2_LEAF_OFFSET)) { | |
899 | /* | |
900 | * Get more bmaps, fill in after the ones | |
901 | * we already have in the table. | |
902 | */ | |
903 | nmap = map_size - map_valid; | |
904 | error = xfs_bmapi(tp, dp, | |
905 | map_off, | |
906 | XFS_DIR2_BYTE_TO_DA(mp, | |
907 | XFS_DIR2_LEAF_OFFSET) - map_off, | |
908 | XFS_BMAPI_METADATA, NULL, 0, | |
909 | &map[map_valid], &nmap, NULL); | |
910 | /* | |
911 | * Don't know if we should ignore this or | |
912 | * try to return an error. | |
913 | * The trouble with returning errors | |
914 | * is that readdir will just stop without | |
915 | * actually passing the error through. | |
916 | */ | |
917 | if (error) | |
918 | break; /* XXX */ | |
919 | /* | |
920 | * If we got all the mappings we asked for, | |
921 | * set the final map offset based on the | |
922 | * last bmap value received. | |
923 | * Otherwise, we've reached the end. | |
924 | */ | |
925 | if (nmap == map_size - map_valid) | |
926 | map_off = | |
927 | map[map_valid + nmap - 1].br_startoff + | |
928 | map[map_valid + nmap - 1].br_blockcount; | |
929 | else | |
930 | map_off = | |
931 | XFS_DIR2_BYTE_TO_DA(mp, | |
932 | XFS_DIR2_LEAF_OFFSET); | |
933 | /* | |
934 | * Look for holes in the mapping, and | |
935 | * eliminate them. Count up the valid blocks. | |
936 | */ | |
937 | for (i = map_valid; i < map_valid + nmap; ) { | |
938 | if (map[i].br_startblock == | |
939 | HOLESTARTBLOCK) { | |
940 | nmap--; | |
941 | length = map_valid + nmap - i; | |
942 | if (length) | |
943 | memmove(&map[i], | |
944 | &map[i + 1], | |
945 | sizeof(map[i]) * | |
946 | length); | |
947 | } else { | |
948 | map_blocks += | |
949 | map[i].br_blockcount; | |
950 | i++; | |
951 | } | |
952 | } | |
953 | map_valid += nmap; | |
954 | } | |
955 | /* | |
956 | * No valid mappings, so no more data blocks. | |
957 | */ | |
958 | if (!map_valid) { | |
959 | curoff = XFS_DIR2_DA_TO_BYTE(mp, map_off); | |
960 | break; | |
961 | } | |
962 | /* | |
963 | * Read the directory block starting at the first | |
964 | * mapping. | |
965 | */ | |
966 | curdb = XFS_DIR2_DA_TO_DB(mp, map->br_startoff); | |
967 | error = xfs_da_read_buf(tp, dp, map->br_startoff, | |
968 | map->br_blockcount >= mp->m_dirblkfsbs ? | |
969 | XFS_FSB_TO_DADDR(mp, map->br_startblock) : | |
970 | -1, | |
971 | &bp, XFS_DATA_FORK); | |
972 | /* | |
973 | * Should just skip over the data block instead | |
974 | * of giving up. | |
975 | */ | |
976 | if (error) | |
977 | break; /* XXX */ | |
978 | /* | |
979 | * Adjust the current amount of read-ahead: we just | |
980 | * read a block that was previously ra. | |
981 | */ | |
982 | if (ra_current) | |
983 | ra_current -= mp->m_dirblkfsbs; | |
984 | /* | |
985 | * Do we need more readahead? | |
986 | */ | |
987 | for (ra_index = ra_offset = i = 0; | |
988 | ra_want > ra_current && i < map_blocks; | |
989 | i += mp->m_dirblkfsbs) { | |
990 | ASSERT(ra_index < map_valid); | |
991 | /* | |
992 | * Read-ahead a contiguous directory block. | |
993 | */ | |
994 | if (i > ra_current && | |
995 | map[ra_index].br_blockcount >= | |
996 | mp->m_dirblkfsbs) { | |
997 | xfs_baread(mp->m_ddev_targp, | |
998 | XFS_FSB_TO_DADDR(mp, | |
999 | map[ra_index].br_startblock + | |
1000 | ra_offset), | |
1001 | (int)BTOBB(mp->m_dirblksize)); | |
1002 | ra_current = i; | |
1003 | } | |
1004 | /* | |
1005 | * Read-ahead a non-contiguous directory block. | |
1006 | * This doesn't use our mapping, but this | |
1007 | * is a very rare case. | |
1008 | */ | |
1009 | else if (i > ra_current) { | |
1010 | (void)xfs_da_reada_buf(tp, dp, | |
1011 | map[ra_index].br_startoff + | |
1012 | ra_offset, XFS_DATA_FORK); | |
1013 | ra_current = i; | |
1014 | } | |
1015 | /* | |
1016 | * Advance offset through the mapping table. | |
1017 | */ | |
1018 | for (j = 0; j < mp->m_dirblkfsbs; j++) { | |
1019 | /* | |
1020 | * The rest of this extent but not | |
1021 | * more than a dir block. | |
1022 | */ | |
1023 | length = MIN(mp->m_dirblkfsbs, | |
1024 | (int)(map[ra_index].br_blockcount - | |
1025 | ra_offset)); | |
1026 | j += length; | |
1027 | ra_offset += length; | |
1028 | /* | |
1029 | * Advance to the next mapping if | |
1030 | * this one is used up. | |
1031 | */ | |
1032 | if (ra_offset == | |
1033 | map[ra_index].br_blockcount) { | |
1034 | ra_offset = 0; | |
1035 | ra_index++; | |
1036 | } | |
1037 | } | |
1038 | } | |
1039 | /* | |
1040 | * Having done a read, we need to set a new offset. | |
1041 | */ | |
1042 | newoff = XFS_DIR2_DB_OFF_TO_BYTE(mp, curdb, 0); | |
1043 | /* | |
1044 | * Start of the current block. | |
1045 | */ | |
1046 | if (curoff < newoff) | |
1047 | curoff = newoff; | |
1048 | /* | |
1049 | * Make sure we're in the right block. | |
1050 | */ | |
1051 | else if (curoff > newoff) | |
1052 | ASSERT(XFS_DIR2_BYTE_TO_DB(mp, curoff) == | |
1053 | curdb); | |
1054 | data = bp->data; | |
1055 | xfs_dir2_data_check(dp, bp); | |
1056 | /* | |
1057 | * Find our position in the block. | |
1058 | */ | |
1059 | ptr = (char *)&data->u; | |
1060 | byteoff = XFS_DIR2_BYTE_TO_OFF(mp, curoff); | |
1061 | /* | |
1062 | * Skip past the header. | |
1063 | */ | |
1064 | if (byteoff == 0) | |
1065 | curoff += (uint)sizeof(data->hdr); | |
1066 | /* | |
1067 | * Skip past entries until we reach our offset. | |
1068 | */ | |
1069 | else { | |
1070 | while ((char *)ptr - (char *)data < byteoff) { | |
1071 | dup = (xfs_dir2_data_unused_t *)ptr; | |
1072 | ||
1073 | if (INT_GET(dup->freetag, ARCH_CONVERT) | |
1074 | == XFS_DIR2_DATA_FREE_TAG) { | |
1075 | ||
1076 | length = INT_GET(dup->length, | |
1077 | ARCH_CONVERT); | |
1078 | ptr += length; | |
1079 | continue; | |
1080 | } | |
1081 | dep = (xfs_dir2_data_entry_t *)ptr; | |
1082 | length = | |
1083 | XFS_DIR2_DATA_ENTSIZE(dep->namelen); | |
1084 | ptr += length; | |
1085 | } | |
1086 | /* | |
1087 | * Now set our real offset. | |
1088 | */ | |
1089 | curoff = | |
1090 | XFS_DIR2_DB_OFF_TO_BYTE(mp, | |
1091 | XFS_DIR2_BYTE_TO_DB(mp, curoff), | |
1092 | (char *)ptr - (char *)data); | |
1093 | if (ptr >= (char *)data + mp->m_dirblksize) { | |
1094 | continue; | |
1095 | } | |
1096 | } | |
1097 | } | |
1098 | /* | |
1099 | * We have a pointer to an entry. | |
1100 | * Is it a live one? | |
1101 | */ | |
1102 | dup = (xfs_dir2_data_unused_t *)ptr; | |
1103 | /* | |
1104 | * No, it's unused, skip over it. | |
1105 | */ | |
1106 | if (INT_GET(dup->freetag, ARCH_CONVERT) | |
1107 | == XFS_DIR2_DATA_FREE_TAG) { | |
1108 | length = INT_GET(dup->length, ARCH_CONVERT); | |
1109 | ptr += length; | |
1110 | curoff += length; | |
1111 | continue; | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * Copy the entry into the putargs, and try formatting it. | |
1116 | */ | |
1117 | dep = (xfs_dir2_data_entry_t *)ptr; | |
1118 | ||
1119 | p.namelen = dep->namelen; | |
1120 | ||
1121 | length = XFS_DIR2_DATA_ENTSIZE(p.namelen); | |
1122 | ||
1123 | p.cook = XFS_DIR2_BYTE_TO_DATAPTR(mp, curoff + length); | |
1124 | ||
1125 | p.ino = INT_GET(dep->inumber, ARCH_CONVERT); | |
1126 | #if XFS_BIG_INUMS | |
1127 | p.ino += mp->m_inoadd; | |
1128 | #endif | |
1129 | p.name = (char *)dep->name; | |
1130 | ||
1131 | error = p.put(&p); | |
1132 | ||
1133 | /* | |
1134 | * Won't fit. Return to caller. | |
1135 | */ | |
1136 | if (!p.done) { | |
1137 | eof = 0; | |
1138 | break; | |
1139 | } | |
1140 | /* | |
1141 | * Advance to next entry in the block. | |
1142 | */ | |
1143 | ptr += length; | |
1144 | curoff += length; | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * All done. Set output offset value to current offset. | |
1149 | */ | |
1150 | *eofp = eof; | |
1151 | if (curoff > XFS_DIR2_DATAPTR_TO_BYTE(mp, XFS_DIR2_MAX_DATAPTR)) | |
1152 | uio->uio_offset = XFS_DIR2_MAX_DATAPTR; | |
1153 | else | |
1154 | uio->uio_offset = XFS_DIR2_BYTE_TO_DATAPTR(mp, curoff); | |
1155 | kmem_free(map, map_size * sizeof(*map)); | |
1156 | if (bp) | |
1157 | xfs_da_brelse(tp, bp); | |
1158 | return error; | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * Initialize a new leaf block, leaf1 or leafn magic accepted. | |
1163 | */ | |
1164 | int | |
1165 | xfs_dir2_leaf_init( | |
1166 | xfs_da_args_t *args, /* operation arguments */ | |
1167 | xfs_dir2_db_t bno, /* directory block number */ | |
1168 | xfs_dabuf_t **bpp, /* out: leaf buffer */ | |
1169 | int magic) /* magic number for block */ | |
1170 | { | |
1171 | xfs_dabuf_t *bp; /* leaf buffer */ | |
1172 | xfs_inode_t *dp; /* incore directory inode */ | |
1173 | int error; /* error return code */ | |
1174 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1175 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ | |
1176 | xfs_mount_t *mp; /* filesystem mount point */ | |
1177 | xfs_trans_t *tp; /* transaction pointer */ | |
1178 | ||
1179 | dp = args->dp; | |
1180 | ASSERT(dp != NULL); | |
1181 | tp = args->trans; | |
1182 | mp = dp->i_mount; | |
1183 | ASSERT(bno >= XFS_DIR2_LEAF_FIRSTDB(mp) && | |
1184 | bno < XFS_DIR2_FREE_FIRSTDB(mp)); | |
1185 | /* | |
1186 | * Get the buffer for the block. | |
1187 | */ | |
1188 | error = xfs_da_get_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, bno), -1, &bp, | |
1189 | XFS_DATA_FORK); | |
1190 | if (error) { | |
1191 | return error; | |
1192 | } | |
1193 | ASSERT(bp != NULL); | |
1194 | leaf = bp->data; | |
1195 | /* | |
1196 | * Initialize the header. | |
1197 | */ | |
1198 | INT_SET(leaf->hdr.info.magic, ARCH_CONVERT, magic); | |
1199 | leaf->hdr.info.forw = 0; | |
1200 | leaf->hdr.info.back = 0; | |
1201 | leaf->hdr.count = 0; | |
1202 | leaf->hdr.stale = 0; | |
1203 | xfs_dir2_leaf_log_header(tp, bp); | |
1204 | /* | |
1205 | * If it's a leaf-format directory initialize the tail. | |
1206 | * In this case our caller has the real bests table to copy into | |
1207 | * the block. | |
1208 | */ | |
1209 | if (magic == XFS_DIR2_LEAF1_MAGIC) { | |
1210 | ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); | |
1211 | ltp->bestcount = 0; | |
1212 | xfs_dir2_leaf_log_tail(tp, bp); | |
1213 | } | |
1214 | *bpp = bp; | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | /* | |
1219 | * Log the bests entries indicated from a leaf1 block. | |
1220 | */ | |
ba0f32d4 | 1221 | static void |
1da177e4 LT |
1222 | xfs_dir2_leaf_log_bests( |
1223 | xfs_trans_t *tp, /* transaction pointer */ | |
1224 | xfs_dabuf_t *bp, /* leaf buffer */ | |
1225 | int first, /* first entry to log */ | |
1226 | int last) /* last entry to log */ | |
1227 | { | |
1228 | xfs_dir2_data_off_t *firstb; /* pointer to first entry */ | |
1229 | xfs_dir2_data_off_t *lastb; /* pointer to last entry */ | |
1230 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1231 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ | |
1232 | ||
1233 | leaf = bp->data; | |
1234 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC); | |
1235 | ltp = XFS_DIR2_LEAF_TAIL_P(tp->t_mountp, leaf); | |
1236 | firstb = XFS_DIR2_LEAF_BESTS_P(ltp) + first; | |
1237 | lastb = XFS_DIR2_LEAF_BESTS_P(ltp) + last; | |
1238 | xfs_da_log_buf(tp, bp, (uint)((char *)firstb - (char *)leaf), | |
1239 | (uint)((char *)lastb - (char *)leaf + sizeof(*lastb) - 1)); | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * Log the leaf entries indicated from a leaf1 or leafn block. | |
1244 | */ | |
1245 | void | |
1246 | xfs_dir2_leaf_log_ents( | |
1247 | xfs_trans_t *tp, /* transaction pointer */ | |
1248 | xfs_dabuf_t *bp, /* leaf buffer */ | |
1249 | int first, /* first entry to log */ | |
1250 | int last) /* last entry to log */ | |
1251 | { | |
1252 | xfs_dir2_leaf_entry_t *firstlep; /* pointer to first entry */ | |
1253 | xfs_dir2_leaf_entry_t *lastlep; /* pointer to last entry */ | |
1254 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1255 | ||
1256 | leaf = bp->data; | |
1257 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC || | |
1258 | INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); | |
1259 | firstlep = &leaf->ents[first]; | |
1260 | lastlep = &leaf->ents[last]; | |
1261 | xfs_da_log_buf(tp, bp, (uint)((char *)firstlep - (char *)leaf), | |
1262 | (uint)((char *)lastlep - (char *)leaf + sizeof(*lastlep) - 1)); | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Log the header of the leaf1 or leafn block. | |
1267 | */ | |
1268 | void | |
1269 | xfs_dir2_leaf_log_header( | |
1270 | xfs_trans_t *tp, /* transaction pointer */ | |
1271 | xfs_dabuf_t *bp) /* leaf buffer */ | |
1272 | { | |
1273 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1274 | ||
1275 | leaf = bp->data; | |
1276 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC || | |
1277 | INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); | |
1278 | xfs_da_log_buf(tp, bp, (uint)((char *)&leaf->hdr - (char *)leaf), | |
1279 | (uint)(sizeof(leaf->hdr) - 1)); | |
1280 | } | |
1281 | ||
1282 | /* | |
1283 | * Log the tail of the leaf1 block. | |
1284 | */ | |
ba0f32d4 | 1285 | STATIC void |
1da177e4 LT |
1286 | xfs_dir2_leaf_log_tail( |
1287 | xfs_trans_t *tp, /* transaction pointer */ | |
1288 | xfs_dabuf_t *bp) /* leaf buffer */ | |
1289 | { | |
1290 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1291 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ | |
1292 | xfs_mount_t *mp; /* filesystem mount point */ | |
1293 | ||
1294 | mp = tp->t_mountp; | |
1295 | leaf = bp->data; | |
1296 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC); | |
1297 | ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); | |
1298 | xfs_da_log_buf(tp, bp, (uint)((char *)ltp - (char *)leaf), | |
1299 | (uint)(mp->m_dirblksize - 1)); | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Look up the entry referred to by args in the leaf format directory. | |
1304 | * Most of the work is done by the xfs_dir2_leaf_lookup_int routine which | |
1305 | * is also used by the node-format code. | |
1306 | */ | |
1307 | int | |
1308 | xfs_dir2_leaf_lookup( | |
1309 | xfs_da_args_t *args) /* operation arguments */ | |
1310 | { | |
1311 | xfs_dabuf_t *dbp; /* data block buffer */ | |
1312 | xfs_dir2_data_entry_t *dep; /* data block entry */ | |
1313 | xfs_inode_t *dp; /* incore directory inode */ | |
1314 | int error; /* error return code */ | |
1315 | int index; /* found entry index */ | |
1316 | xfs_dabuf_t *lbp; /* leaf buffer */ | |
1317 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1318 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
1319 | xfs_trans_t *tp; /* transaction pointer */ | |
1320 | ||
1321 | xfs_dir2_trace_args("leaf_lookup", args); | |
1322 | /* | |
1323 | * Look up name in the leaf block, returning both buffers and index. | |
1324 | */ | |
1325 | if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) { | |
1326 | return error; | |
1327 | } | |
1328 | tp = args->trans; | |
1329 | dp = args->dp; | |
1330 | xfs_dir2_leaf_check(dp, lbp); | |
1331 | leaf = lbp->data; | |
1332 | /* | |
1333 | * Get to the leaf entry and contained data entry address. | |
1334 | */ | |
1335 | lep = &leaf->ents[index]; | |
1336 | /* | |
1337 | * Point to the data entry. | |
1338 | */ | |
1339 | dep = (xfs_dir2_data_entry_t *) | |
1340 | ((char *)dbp->data + | |
1341 | XFS_DIR2_DATAPTR_TO_OFF(dp->i_mount, INT_GET(lep->address, ARCH_CONVERT))); | |
1342 | /* | |
1343 | * Return the found inode number. | |
1344 | */ | |
1345 | args->inumber = INT_GET(dep->inumber, ARCH_CONVERT); | |
1346 | xfs_da_brelse(tp, dbp); | |
1347 | xfs_da_brelse(tp, lbp); | |
1348 | return XFS_ERROR(EEXIST); | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * Look up name/hash in the leaf block. | |
1353 | * Fill in indexp with the found index, and dbpp with the data buffer. | |
1354 | * If not found dbpp will be NULL, and ENOENT comes back. | |
1355 | * lbpp will always be filled in with the leaf buffer unless there's an error. | |
1356 | */ | |
1357 | static int /* error */ | |
1358 | xfs_dir2_leaf_lookup_int( | |
1359 | xfs_da_args_t *args, /* operation arguments */ | |
1360 | xfs_dabuf_t **lbpp, /* out: leaf buffer */ | |
1361 | int *indexp, /* out: index in leaf block */ | |
1362 | xfs_dabuf_t **dbpp) /* out: data buffer */ | |
1363 | { | |
1364 | xfs_dir2_db_t curdb; /* current data block number */ | |
1365 | xfs_dabuf_t *dbp; /* data buffer */ | |
1366 | xfs_dir2_data_entry_t *dep; /* data entry */ | |
1367 | xfs_inode_t *dp; /* incore directory inode */ | |
1368 | int error; /* error return code */ | |
1369 | int index; /* index in leaf block */ | |
1370 | xfs_dabuf_t *lbp; /* leaf buffer */ | |
1371 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
1372 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1373 | xfs_mount_t *mp; /* filesystem mount point */ | |
1374 | xfs_dir2_db_t newdb; /* new data block number */ | |
1375 | xfs_trans_t *tp; /* transaction pointer */ | |
1376 | ||
1377 | dp = args->dp; | |
1378 | tp = args->trans; | |
1379 | mp = dp->i_mount; | |
1380 | /* | |
1381 | * Read the leaf block into the buffer. | |
1382 | */ | |
1383 | if ((error = | |
1384 | xfs_da_read_buf(tp, dp, mp->m_dirleafblk, -1, &lbp, | |
1385 | XFS_DATA_FORK))) { | |
1386 | return error; | |
1387 | } | |
1388 | *lbpp = lbp; | |
1389 | leaf = lbp->data; | |
1390 | xfs_dir2_leaf_check(dp, lbp); | |
1391 | /* | |
1392 | * Look for the first leaf entry with our hash value. | |
1393 | */ | |
1394 | index = xfs_dir2_leaf_search_hash(args, lbp); | |
1395 | /* | |
1396 | * Loop over all the entries with the right hash value | |
1397 | * looking to match the name. | |
1398 | */ | |
1399 | for (lep = &leaf->ents[index], dbp = NULL, curdb = -1; | |
1400 | index < INT_GET(leaf->hdr.count, ARCH_CONVERT) && INT_GET(lep->hashval, ARCH_CONVERT) == args->hashval; | |
1401 | lep++, index++) { | |
1402 | /* | |
1403 | * Skip over stale leaf entries. | |
1404 | */ | |
1405 | if (INT_GET(lep->address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) | |
1406 | continue; | |
1407 | /* | |
1408 | * Get the new data block number. | |
1409 | */ | |
1410 | newdb = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT)); | |
1411 | /* | |
1412 | * If it's not the same as the old data block number, | |
1413 | * need to pitch the old one and read the new one. | |
1414 | */ | |
1415 | if (newdb != curdb) { | |
1416 | if (dbp) | |
1417 | xfs_da_brelse(tp, dbp); | |
1418 | if ((error = | |
1419 | xfs_da_read_buf(tp, dp, | |
1420 | XFS_DIR2_DB_TO_DA(mp, newdb), -1, &dbp, | |
1421 | XFS_DATA_FORK))) { | |
1422 | xfs_da_brelse(tp, lbp); | |
1423 | return error; | |
1424 | } | |
1425 | xfs_dir2_data_check(dp, dbp); | |
1426 | curdb = newdb; | |
1427 | } | |
1428 | /* | |
1429 | * Point to the data entry. | |
1430 | */ | |
1431 | dep = (xfs_dir2_data_entry_t *) | |
1432 | ((char *)dbp->data + | |
1433 | XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(lep->address, ARCH_CONVERT))); | |
1434 | /* | |
1435 | * If it matches then return it. | |
1436 | */ | |
1437 | if (dep->namelen == args->namelen && | |
1438 | dep->name[0] == args->name[0] && | |
1439 | memcmp(dep->name, args->name, args->namelen) == 0) { | |
1440 | *dbpp = dbp; | |
1441 | *indexp = index; | |
1442 | return 0; | |
1443 | } | |
1444 | } | |
1445 | /* | |
1446 | * No match found, return ENOENT. | |
1447 | */ | |
1448 | ASSERT(args->oknoent); | |
1449 | if (dbp) | |
1450 | xfs_da_brelse(tp, dbp); | |
1451 | xfs_da_brelse(tp, lbp); | |
1452 | return XFS_ERROR(ENOENT); | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * Remove an entry from a leaf format directory. | |
1457 | */ | |
1458 | int /* error */ | |
1459 | xfs_dir2_leaf_removename( | |
1460 | xfs_da_args_t *args) /* operation arguments */ | |
1461 | { | |
1462 | xfs_dir2_data_off_t *bestsp; /* leaf block best freespace */ | |
1463 | xfs_dir2_data_t *data; /* data block structure */ | |
1464 | xfs_dir2_db_t db; /* data block number */ | |
1465 | xfs_dabuf_t *dbp; /* data block buffer */ | |
1466 | xfs_dir2_data_entry_t *dep; /* data entry structure */ | |
1467 | xfs_inode_t *dp; /* incore directory inode */ | |
1468 | int error; /* error return code */ | |
1469 | xfs_dir2_db_t i; /* temporary data block # */ | |
1470 | int index; /* index into leaf entries */ | |
1471 | xfs_dabuf_t *lbp; /* leaf buffer */ | |
1472 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1473 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
1474 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ | |
1475 | xfs_mount_t *mp; /* filesystem mount point */ | |
1476 | int needlog; /* need to log data header */ | |
1477 | int needscan; /* need to rescan data frees */ | |
1478 | xfs_dir2_data_off_t oldbest; /* old value of best free */ | |
1479 | xfs_trans_t *tp; /* transaction pointer */ | |
1480 | ||
1481 | xfs_dir2_trace_args("leaf_removename", args); | |
1482 | /* | |
1483 | * Lookup the leaf entry, get the leaf and data blocks read in. | |
1484 | */ | |
1485 | if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) { | |
1486 | return error; | |
1487 | } | |
1488 | dp = args->dp; | |
1489 | tp = args->trans; | |
1490 | mp = dp->i_mount; | |
1491 | leaf = lbp->data; | |
1492 | data = dbp->data; | |
1493 | xfs_dir2_data_check(dp, dbp); | |
1494 | /* | |
1495 | * Point to the leaf entry, use that to point to the data entry. | |
1496 | */ | |
1497 | lep = &leaf->ents[index]; | |
1498 | db = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT)); | |
1499 | dep = (xfs_dir2_data_entry_t *) | |
1500 | ((char *)data + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(lep->address, ARCH_CONVERT))); | |
1501 | needscan = needlog = 0; | |
1502 | oldbest = INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT); | |
1503 | ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); | |
1504 | bestsp = XFS_DIR2_LEAF_BESTS_P(ltp); | |
1505 | ASSERT(INT_GET(bestsp[db], ARCH_CONVERT) == oldbest); | |
1506 | /* | |
1507 | * Mark the former data entry unused. | |
1508 | */ | |
1509 | xfs_dir2_data_make_free(tp, dbp, | |
1510 | (xfs_dir2_data_aoff_t)((char *)dep - (char *)data), | |
1511 | XFS_DIR2_DATA_ENTSIZE(dep->namelen), &needlog, &needscan); | |
1512 | /* | |
1513 | * We just mark the leaf entry stale by putting a null in it. | |
1514 | */ | |
1515 | INT_MOD(leaf->hdr.stale, ARCH_CONVERT, +1); | |
1516 | xfs_dir2_leaf_log_header(tp, lbp); | |
1517 | INT_SET(lep->address, ARCH_CONVERT, XFS_DIR2_NULL_DATAPTR); | |
1518 | xfs_dir2_leaf_log_ents(tp, lbp, index, index); | |
1519 | /* | |
1520 | * Scan the freespace in the data block again if necessary, | |
1521 | * log the data block header if necessary. | |
1522 | */ | |
1523 | if (needscan) | |
1524 | xfs_dir2_data_freescan(mp, data, &needlog, NULL); | |
1525 | if (needlog) | |
1526 | xfs_dir2_data_log_header(tp, dbp); | |
1527 | /* | |
1528 | * If the longest freespace in the data block has changed, | |
1529 | * put the new value in the bests table and log that. | |
1530 | */ | |
1531 | if (INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT) != oldbest) { | |
1532 | INT_COPY(bestsp[db], data->hdr.bestfree[0].length, ARCH_CONVERT); | |
1533 | xfs_dir2_leaf_log_bests(tp, lbp, db, db); | |
1534 | } | |
1535 | xfs_dir2_data_check(dp, dbp); | |
1536 | /* | |
1537 | * If the data block is now empty then get rid of the data block. | |
1538 | */ | |
1539 | if (INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT) == | |
1540 | mp->m_dirblksize - (uint)sizeof(data->hdr)) { | |
1541 | ASSERT(db != mp->m_dirdatablk); | |
1542 | if ((error = xfs_dir2_shrink_inode(args, db, dbp))) { | |
1543 | /* | |
1544 | * Nope, can't get rid of it because it caused | |
1545 | * allocation of a bmap btree block to do so. | |
1546 | * Just go on, returning success, leaving the | |
1547 | * empty block in place. | |
1548 | */ | |
1549 | if (error == ENOSPC && args->total == 0) { | |
1550 | xfs_da_buf_done(dbp); | |
1551 | error = 0; | |
1552 | } | |
1553 | xfs_dir2_leaf_check(dp, lbp); | |
1554 | xfs_da_buf_done(lbp); | |
1555 | return error; | |
1556 | } | |
1557 | dbp = NULL; | |
1558 | /* | |
1559 | * If this is the last data block then compact the | |
1560 | * bests table by getting rid of entries. | |
1561 | */ | |
1562 | if (db == INT_GET(ltp->bestcount, ARCH_CONVERT) - 1) { | |
1563 | /* | |
1564 | * Look for the last active entry (i). | |
1565 | */ | |
1566 | for (i = db - 1; i > 0; i--) { | |
1567 | if (INT_GET(bestsp[i], ARCH_CONVERT) != NULLDATAOFF) | |
1568 | break; | |
1569 | } | |
1570 | /* | |
1571 | * Copy the table down so inactive entries at the | |
1572 | * end are removed. | |
1573 | */ | |
1574 | memmove(&bestsp[db - i], bestsp, | |
1575 | (INT_GET(ltp->bestcount, ARCH_CONVERT) - (db - i)) * sizeof(*bestsp)); | |
1576 | INT_MOD(ltp->bestcount, ARCH_CONVERT, -(db - i)); | |
1577 | xfs_dir2_leaf_log_tail(tp, lbp); | |
1578 | xfs_dir2_leaf_log_bests(tp, lbp, 0, INT_GET(ltp->bestcount, ARCH_CONVERT) - 1); | |
1579 | } else | |
1580 | INT_SET(bestsp[db], ARCH_CONVERT, NULLDATAOFF); | |
1581 | } | |
1582 | /* | |
1583 | * If the data block was not the first one, drop it. | |
1584 | */ | |
1585 | else if (db != mp->m_dirdatablk && dbp != NULL) { | |
1586 | xfs_da_buf_done(dbp); | |
1587 | dbp = NULL; | |
1588 | } | |
1589 | xfs_dir2_leaf_check(dp, lbp); | |
1590 | /* | |
1591 | * See if we can convert to block form. | |
1592 | */ | |
1593 | return xfs_dir2_leaf_to_block(args, lbp, dbp); | |
1594 | } | |
1595 | ||
1596 | /* | |
1597 | * Replace the inode number in a leaf format directory entry. | |
1598 | */ | |
1599 | int /* error */ | |
1600 | xfs_dir2_leaf_replace( | |
1601 | xfs_da_args_t *args) /* operation arguments */ | |
1602 | { | |
1603 | xfs_dabuf_t *dbp; /* data block buffer */ | |
1604 | xfs_dir2_data_entry_t *dep; /* data block entry */ | |
1605 | xfs_inode_t *dp; /* incore directory inode */ | |
1606 | int error; /* error return code */ | |
1607 | int index; /* index of leaf entry */ | |
1608 | xfs_dabuf_t *lbp; /* leaf buffer */ | |
1609 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1610 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
1611 | xfs_trans_t *tp; /* transaction pointer */ | |
1612 | ||
1613 | xfs_dir2_trace_args("leaf_replace", args); | |
1614 | /* | |
1615 | * Look up the entry. | |
1616 | */ | |
1617 | if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) { | |
1618 | return error; | |
1619 | } | |
1620 | dp = args->dp; | |
1621 | leaf = lbp->data; | |
1622 | /* | |
1623 | * Point to the leaf entry, get data address from it. | |
1624 | */ | |
1625 | lep = &leaf->ents[index]; | |
1626 | /* | |
1627 | * Point to the data entry. | |
1628 | */ | |
1629 | dep = (xfs_dir2_data_entry_t *) | |
1630 | ((char *)dbp->data + | |
1631 | XFS_DIR2_DATAPTR_TO_OFF(dp->i_mount, INT_GET(lep->address, ARCH_CONVERT))); | |
1632 | ASSERT(args->inumber != INT_GET(dep->inumber, ARCH_CONVERT)); | |
1633 | /* | |
1634 | * Put the new inode number in, log it. | |
1635 | */ | |
1636 | INT_SET(dep->inumber, ARCH_CONVERT, args->inumber); | |
1637 | tp = args->trans; | |
1638 | xfs_dir2_data_log_entry(tp, dbp, dep); | |
1639 | xfs_da_buf_done(dbp); | |
1640 | xfs_dir2_leaf_check(dp, lbp); | |
1641 | xfs_da_brelse(tp, lbp); | |
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | /* | |
1646 | * Return index in the leaf block (lbp) which is either the first | |
1647 | * one with this hash value, or if there are none, the insert point | |
1648 | * for that hash value. | |
1649 | */ | |
1650 | int /* index value */ | |
1651 | xfs_dir2_leaf_search_hash( | |
1652 | xfs_da_args_t *args, /* operation arguments */ | |
1653 | xfs_dabuf_t *lbp) /* leaf buffer */ | |
1654 | { | |
1655 | xfs_dahash_t hash=0; /* hash from this entry */ | |
1656 | xfs_dahash_t hashwant; /* hash value looking for */ | |
1657 | int high; /* high leaf index */ | |
1658 | int low; /* low leaf index */ | |
1659 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1660 | xfs_dir2_leaf_entry_t *lep; /* leaf entry */ | |
1661 | int mid=0; /* current leaf index */ | |
1662 | ||
1663 | leaf = lbp->data; | |
1664 | #ifndef __KERNEL__ | |
1665 | if (!leaf->hdr.count) | |
1666 | return 0; | |
1667 | #endif | |
1668 | /* | |
1669 | * Note, the table cannot be empty, so we have to go through the loop. | |
1670 | * Binary search the leaf entries looking for our hash value. | |
1671 | */ | |
1672 | for (lep = leaf->ents, low = 0, high = INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1, | |
1673 | hashwant = args->hashval; | |
1674 | low <= high; ) { | |
1675 | mid = (low + high) >> 1; | |
1676 | if ((hash = INT_GET(lep[mid].hashval, ARCH_CONVERT)) == hashwant) | |
1677 | break; | |
1678 | if (hash < hashwant) | |
1679 | low = mid + 1; | |
1680 | else | |
1681 | high = mid - 1; | |
1682 | } | |
1683 | /* | |
1684 | * Found one, back up through all the equal hash values. | |
1685 | */ | |
1686 | if (hash == hashwant) { | |
1687 | while (mid > 0 && INT_GET(lep[mid - 1].hashval, ARCH_CONVERT) == hashwant) { | |
1688 | mid--; | |
1689 | } | |
1690 | } | |
1691 | /* | |
1692 | * Need to point to an entry higher than ours. | |
1693 | */ | |
1694 | else if (hash < hashwant) | |
1695 | mid++; | |
1696 | return mid; | |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | * Trim off a trailing data block. We know it's empty since the leaf | |
1701 | * freespace table says so. | |
1702 | */ | |
1703 | int /* error */ | |
1704 | xfs_dir2_leaf_trim_data( | |
1705 | xfs_da_args_t *args, /* operation arguments */ | |
1706 | xfs_dabuf_t *lbp, /* leaf buffer */ | |
1707 | xfs_dir2_db_t db) /* data block number */ | |
1708 | { | |
1709 | xfs_dir2_data_off_t *bestsp; /* leaf bests table */ | |
1710 | #ifdef DEBUG | |
1711 | xfs_dir2_data_t *data; /* data block structure */ | |
1712 | #endif | |
1713 | xfs_dabuf_t *dbp; /* data block buffer */ | |
1714 | xfs_inode_t *dp; /* incore directory inode */ | |
1715 | int error; /* error return value */ | |
1716 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1717 | xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ | |
1718 | xfs_mount_t *mp; /* filesystem mount point */ | |
1719 | xfs_trans_t *tp; /* transaction pointer */ | |
1720 | ||
1721 | dp = args->dp; | |
1722 | mp = dp->i_mount; | |
1723 | tp = args->trans; | |
1724 | /* | |
1725 | * Read the offending data block. We need its buffer. | |
1726 | */ | |
1727 | if ((error = xfs_da_read_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, db), -1, &dbp, | |
1728 | XFS_DATA_FORK))) { | |
1729 | return error; | |
1730 | } | |
1731 | #ifdef DEBUG | |
1732 | data = dbp->data; | |
1733 | ASSERT(INT_GET(data->hdr.magic, ARCH_CONVERT) == XFS_DIR2_DATA_MAGIC); | |
1734 | #endif | |
1735 | /* this seems to be an error | |
1736 | * data is only valid if DEBUG is defined? | |
1737 | * RMC 09/08/1999 | |
1738 | */ | |
1739 | ||
1740 | leaf = lbp->data; | |
1741 | ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); | |
1742 | ASSERT(INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT) == | |
1743 | mp->m_dirblksize - (uint)sizeof(data->hdr)); | |
1744 | ASSERT(db == INT_GET(ltp->bestcount, ARCH_CONVERT) - 1); | |
1745 | /* | |
1746 | * Get rid of the data block. | |
1747 | */ | |
1748 | if ((error = xfs_dir2_shrink_inode(args, db, dbp))) { | |
1749 | ASSERT(error != ENOSPC); | |
1750 | xfs_da_brelse(tp, dbp); | |
1751 | return error; | |
1752 | } | |
1753 | /* | |
1754 | * Eliminate the last bests entry from the table. | |
1755 | */ | |
1756 | bestsp = XFS_DIR2_LEAF_BESTS_P(ltp); | |
1757 | INT_MOD(ltp->bestcount, ARCH_CONVERT, -1); | |
1758 | memmove(&bestsp[1], &bestsp[0], INT_GET(ltp->bestcount, ARCH_CONVERT) * sizeof(*bestsp)); | |
1759 | xfs_dir2_leaf_log_tail(tp, lbp); | |
1760 | xfs_dir2_leaf_log_bests(tp, lbp, 0, INT_GET(ltp->bestcount, ARCH_CONVERT) - 1); | |
1761 | return 0; | |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * Convert node form directory to leaf form directory. | |
1766 | * The root of the node form dir needs to already be a LEAFN block. | |
1767 | * Just return if we can't do anything. | |
1768 | */ | |
1769 | int /* error */ | |
1770 | xfs_dir2_node_to_leaf( | |
1771 | xfs_da_state_t *state) /* directory operation state */ | |
1772 | { | |
1773 | xfs_da_args_t *args; /* operation arguments */ | |
1774 | xfs_inode_t *dp; /* incore directory inode */ | |
1775 | int error; /* error return code */ | |
1776 | xfs_dabuf_t *fbp; /* buffer for freespace block */ | |
1777 | xfs_fileoff_t fo; /* freespace file offset */ | |
1778 | xfs_dir2_free_t *free; /* freespace structure */ | |
1779 | xfs_dabuf_t *lbp; /* buffer for leaf block */ | |
1780 | xfs_dir2_leaf_tail_t *ltp; /* tail of leaf structure */ | |
1781 | xfs_dir2_leaf_t *leaf; /* leaf structure */ | |
1782 | xfs_mount_t *mp; /* filesystem mount point */ | |
1783 | int rval; /* successful free trim? */ | |
1784 | xfs_trans_t *tp; /* transaction pointer */ | |
1785 | ||
1786 | /* | |
1787 | * There's more than a leaf level in the btree, so there must | |
1788 | * be multiple leafn blocks. Give up. | |
1789 | */ | |
1790 | if (state->path.active > 1) | |
1791 | return 0; | |
1792 | args = state->args; | |
1793 | xfs_dir2_trace_args("node_to_leaf", args); | |
1794 | mp = state->mp; | |
1795 | dp = args->dp; | |
1796 | tp = args->trans; | |
1797 | /* | |
1798 | * Get the last offset in the file. | |
1799 | */ | |
1800 | if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) { | |
1801 | return error; | |
1802 | } | |
1803 | fo -= mp->m_dirblkfsbs; | |
1804 | /* | |
1805 | * If there are freespace blocks other than the first one, | |
1806 | * take this opportunity to remove trailing empty freespace blocks | |
1807 | * that may have been left behind during no-space-reservation | |
1808 | * operations. | |
1809 | */ | |
1810 | while (fo > mp->m_dirfreeblk) { | |
1811 | if ((error = xfs_dir2_node_trim_free(args, fo, &rval))) { | |
1812 | return error; | |
1813 | } | |
1814 | if (rval) | |
1815 | fo -= mp->m_dirblkfsbs; | |
1816 | else | |
1817 | return 0; | |
1818 | } | |
1819 | /* | |
1820 | * Now find the block just before the freespace block. | |
1821 | */ | |
1822 | if ((error = xfs_bmap_last_before(tp, dp, &fo, XFS_DATA_FORK))) { | |
1823 | return error; | |
1824 | } | |
1825 | /* | |
1826 | * If it's not the single leaf block, give up. | |
1827 | */ | |
1828 | if (XFS_FSB_TO_B(mp, fo) > XFS_DIR2_LEAF_OFFSET + mp->m_dirblksize) | |
1829 | return 0; | |
1830 | lbp = state->path.blk[0].bp; | |
1831 | leaf = lbp->data; | |
1832 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); | |
1833 | /* | |
1834 | * Read the freespace block. | |
1835 | */ | |
1836 | if ((error = xfs_da_read_buf(tp, dp, mp->m_dirfreeblk, -1, &fbp, | |
1837 | XFS_DATA_FORK))) { | |
1838 | return error; | |
1839 | } | |
1840 | free = fbp->data; | |
1841 | ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); | |
1842 | ASSERT(!free->hdr.firstdb); | |
1843 | /* | |
1844 | * Now see if the leafn and free data will fit in a leaf1. | |
1845 | * If not, release the buffer and give up. | |
1846 | */ | |
1847 | if ((uint)sizeof(leaf->hdr) + | |
1848 | (INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT)) * (uint)sizeof(leaf->ents[0]) + | |
1849 | INT_GET(free->hdr.nvalid, ARCH_CONVERT) * (uint)sizeof(leaf->bests[0]) + | |
1850 | (uint)sizeof(leaf->tail) > | |
1851 | mp->m_dirblksize) { | |
1852 | xfs_da_brelse(tp, fbp); | |
1853 | return 0; | |
1854 | } | |
1855 | /* | |
1856 | * If the leaf has any stale entries in it, compress them out. | |
1857 | * The compact routine will log the header. | |
1858 | */ | |
1859 | if (INT_GET(leaf->hdr.stale, ARCH_CONVERT)) | |
1860 | xfs_dir2_leaf_compact(args, lbp); | |
1861 | else | |
1862 | xfs_dir2_leaf_log_header(tp, lbp); | |
1863 | INT_SET(leaf->hdr.info.magic, ARCH_CONVERT, XFS_DIR2_LEAF1_MAGIC); | |
1864 | /* | |
1865 | * Set up the leaf tail from the freespace block. | |
1866 | */ | |
1867 | ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); | |
1868 | INT_COPY(ltp->bestcount, free->hdr.nvalid, ARCH_CONVERT); | |
1869 | /* | |
1870 | * Set up the leaf bests table. | |
1871 | */ | |
1872 | memcpy(XFS_DIR2_LEAF_BESTS_P(ltp), free->bests, | |
1873 | INT_GET(ltp->bestcount, ARCH_CONVERT) * sizeof(leaf->bests[0])); | |
1874 | xfs_dir2_leaf_log_bests(tp, lbp, 0, INT_GET(ltp->bestcount, ARCH_CONVERT) - 1); | |
1875 | xfs_dir2_leaf_log_tail(tp, lbp); | |
1876 | xfs_dir2_leaf_check(dp, lbp); | |
1877 | /* | |
1878 | * Get rid of the freespace block. | |
1879 | */ | |
1880 | error = xfs_dir2_shrink_inode(args, XFS_DIR2_FREE_FIRSTDB(mp), fbp); | |
1881 | if (error) { | |
1882 | /* | |
1883 | * This can't fail here because it can only happen when | |
1884 | * punching out the middle of an extent, and this is an | |
1885 | * isolated block. | |
1886 | */ | |
1887 | ASSERT(error != ENOSPC); | |
1888 | return error; | |
1889 | } | |
1890 | fbp = NULL; | |
1891 | /* | |
1892 | * Now see if we can convert the single-leaf directory | |
1893 | * down to a block form directory. | |
1894 | * This routine always kills the dabuf for the leaf, so | |
1895 | * eliminate it from the path. | |
1896 | */ | |
1897 | error = xfs_dir2_leaf_to_block(args, lbp, NULL); | |
1898 | state->path.blk[0].bp = NULL; | |
1899 | return error; | |
1900 | } |