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2bd0ea18 | 1 | /* |
0d3e0b37 | 2 | * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved. |
5000d01d | 3 | * |
2bd0ea18 NS |
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. | |
5000d01d | 7 | * |
2bd0ea18 NS |
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. | |
5000d01d | 11 | * |
2bd0ea18 NS |
12 | * Further, this software is distributed without any warranty that it is |
13 | * free of the rightful claim of any third person regarding infringement | |
5000d01d | 14 | * or the like. Any license provided herein, whether implied or |
2bd0ea18 NS |
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. | |
5000d01d | 18 | * |
2bd0ea18 NS |
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. | |
5000d01d | 22 | * |
2bd0ea18 NS |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, |
24 | * Mountain View, CA 94043, or: | |
5000d01d SL |
25 | * |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
2bd0ea18 NS |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ |
31 | */ | |
32 | ||
33 | #include <xfs.h> | |
34 | ||
35 | /* | |
36 | * xfs_da_btree.c | |
37 | * | |
38 | * Routines to implement directories as Btrees of hashed names. | |
39 | */ | |
40 | ||
41 | ||
42 | /*======================================================================== | |
43 | * Routines used for growing the Btree. | |
44 | *========================================================================*/ | |
45 | ||
46 | /* | |
47 | * Create the initial contents of an intermediate node. | |
48 | */ | |
49 | int | |
50 | xfs_da_node_create(xfs_da_args_t *args, xfs_dablk_t blkno, int level, | |
51 | xfs_dabuf_t **bpp, int whichfork) | |
52 | { | |
53 | xfs_da_intnode_t *node; | |
54 | xfs_dabuf_t *bp; | |
55 | int error; | |
56 | xfs_trans_t *tp; | |
57 | ||
58 | tp = args->trans; | |
59 | error = xfs_da_get_buf(tp, args->dp, blkno, -1, &bp, whichfork); | |
60 | if (error) | |
61 | return(error); | |
62 | ASSERT(bp != NULL); | |
63 | node = bp->data; | |
64 | INT_ZERO(node->hdr.info.forw, ARCH_CONVERT); | |
5000d01d | 65 | INT_ZERO(node->hdr.info.back, ARCH_CONVERT); |
2bd0ea18 NS |
66 | INT_SET(node->hdr.info.magic, ARCH_CONVERT, XFS_DA_NODE_MAGIC); |
67 | INT_ZERO(node->hdr.info.pad, ARCH_CONVERT); | |
68 | INT_ZERO(node->hdr.count, ARCH_CONVERT); | |
69 | INT_SET(node->hdr.level, ARCH_CONVERT, level); | |
70 | ||
71 | xfs_da_log_buf(tp, bp, | |
72 | XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr))); | |
73 | ||
74 | *bpp = bp; | |
75 | return(0); | |
76 | } | |
77 | ||
78 | /* | |
79 | * Split a leaf node, rebalance, then possibly split | |
80 | * intermediate nodes, rebalance, etc. | |
81 | */ | |
82 | int /* error */ | |
83 | xfs_da_split(xfs_da_state_t *state) | |
84 | { | |
85 | xfs_da_state_blk_t *oldblk, *newblk, *addblk; | |
86 | xfs_da_intnode_t *node; | |
87 | xfs_dabuf_t *bp; | |
88 | int max, action, error, i; | |
89 | ||
90 | /* | |
91 | * Walk back up the tree splitting/inserting/adjusting as necessary. | |
92 | * If we need to insert and there isn't room, split the node, then | |
93 | * decide which fragment to insert the new block from below into. | |
94 | * Note that we may split the root this way, but we need more fixup. | |
95 | */ | |
96 | max = state->path.active - 1; | |
97 | ASSERT((max >= 0) && (max < XFS_DA_NODE_MAXDEPTH)); | |
98 | ASSERT(state->path.blk[max].magic == XFS_ATTR_LEAF_MAGIC || | |
99 | state->path.blk[max].magic == XFS_DIRX_LEAF_MAGIC(state->mp)); | |
100 | ||
101 | addblk = &state->path.blk[max]; /* initial dummy value */ | |
102 | for (i = max; (i >= 0) && addblk; state->path.active--, i--) { | |
103 | oldblk = &state->path.blk[i]; | |
104 | newblk = &state->altpath.blk[i]; | |
105 | ||
106 | /* | |
107 | * If a leaf node then | |
108 | * Allocate a new leaf node, then rebalance across them. | |
109 | * else if an intermediate node then | |
110 | * We split on the last layer, must we split the node? | |
111 | */ | |
112 | switch (oldblk->magic) { | |
113 | case XFS_ATTR_LEAF_MAGIC: | |
114 | #ifndef __KERNEL__ | |
115 | return(ENOTTY); | |
116 | #else | |
117 | error = xfs_attr_leaf_split(state, oldblk, newblk); | |
118 | if ((error != 0) && (error != ENOSPC)) { | |
119 | return(error); /* GROT: attr is inconsistent */ | |
120 | } | |
121 | if (!error) { | |
122 | addblk = newblk; | |
123 | break; | |
124 | } | |
125 | /* | |
126 | * Entry wouldn't fit, split the leaf again. | |
127 | */ | |
128 | state->extravalid = 1; | |
129 | if (state->inleaf) { | |
130 | state->extraafter = 0; /* before newblk */ | |
131 | error = xfs_attr_leaf_split(state, oldblk, | |
132 | &state->extrablk); | |
133 | } else { | |
134 | state->extraafter = 1; /* after newblk */ | |
135 | error = xfs_attr_leaf_split(state, newblk, | |
136 | &state->extrablk); | |
137 | } | |
138 | if (error) | |
139 | return(error); /* GROT: attr inconsistent */ | |
140 | addblk = newblk; | |
141 | break; | |
142 | #endif | |
143 | case XFS_DIR_LEAF_MAGIC: | |
144 | ASSERT(XFS_DIR_IS_V1(state->mp)); | |
145 | error = xfs_dir_leaf_split(state, oldblk, newblk); | |
146 | if ((error != 0) && (error != ENOSPC)) { | |
147 | return(error); /* GROT: dir is inconsistent */ | |
148 | } | |
149 | if (!error) { | |
150 | addblk = newblk; | |
151 | break; | |
152 | } | |
153 | /* | |
154 | * Entry wouldn't fit, split the leaf again. | |
155 | */ | |
156 | state->extravalid = 1; | |
157 | if (state->inleaf) { | |
158 | state->extraafter = 0; /* before newblk */ | |
159 | error = xfs_dir_leaf_split(state, oldblk, | |
160 | &state->extrablk); | |
161 | if (error) | |
162 | return(error); /* GROT: dir incon. */ | |
163 | addblk = newblk; | |
164 | } else { | |
165 | state->extraafter = 1; /* after newblk */ | |
166 | error = xfs_dir_leaf_split(state, newblk, | |
167 | &state->extrablk); | |
168 | if (error) | |
169 | return(error); /* GROT: dir incon. */ | |
170 | addblk = newblk; | |
171 | } | |
172 | break; | |
173 | case XFS_DIR2_LEAFN_MAGIC: | |
174 | ASSERT(XFS_DIR_IS_V2(state->mp)); | |
175 | error = xfs_dir2_leafn_split(state, oldblk, newblk); | |
176 | if (error) | |
177 | return error; | |
178 | addblk = newblk; | |
179 | break; | |
180 | case XFS_DA_NODE_MAGIC: | |
181 | error = xfs_da_node_split(state, oldblk, newblk, addblk, | |
182 | max - i, &action); | |
183 | xfs_da_buf_done(addblk->bp); | |
184 | addblk->bp = NULL; | |
185 | if (error) | |
186 | return(error); /* GROT: dir is inconsistent */ | |
187 | /* | |
188 | * Record the newly split block for the next time thru? | |
189 | */ | |
190 | if (action) | |
191 | addblk = newblk; | |
192 | else | |
193 | addblk = NULL; | |
194 | break; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Update the btree to show the new hashval for this child. | |
199 | */ | |
200 | xfs_da_fixhashpath(state, &state->path); | |
201 | /* | |
202 | * If we won't need this block again, it's getting dropped | |
203 | * from the active path by the loop control, so we need | |
204 | * to mark it done now. | |
205 | */ | |
206 | if (i > 0 || !addblk) | |
207 | xfs_da_buf_done(oldblk->bp); | |
208 | } | |
209 | if (!addblk) | |
210 | return(0); | |
211 | ||
212 | /* | |
213 | * Split the root node. | |
214 | */ | |
215 | ASSERT(state->path.active == 0); | |
216 | oldblk = &state->path.blk[0]; | |
217 | error = xfs_da_root_split(state, oldblk, addblk); | |
218 | if (error) { | |
219 | xfs_da_buf_done(oldblk->bp); | |
220 | xfs_da_buf_done(addblk->bp); | |
221 | addblk->bp = NULL; | |
222 | return(error); /* GROT: dir is inconsistent */ | |
223 | } | |
224 | ||
225 | /* | |
226 | * Update pointers to the node which used to be block 0 and | |
227 | * just got bumped because of the addition of a new root node. | |
228 | * There might be three blocks involved if a double split occurred, | |
229 | * and the original block 0 could be at any position in the list. | |
230 | */ | |
231 | ||
232 | node = oldblk->bp->data; | |
233 | if (!INT_ISZERO(node->hdr.info.forw, ARCH_CONVERT)) { | |
234 | if (INT_GET(node->hdr.info.forw, ARCH_CONVERT) == addblk->blkno) { | |
235 | bp = addblk->bp; | |
236 | } else { | |
237 | ASSERT(state->extravalid); | |
238 | bp = state->extrablk.bp; | |
239 | } | |
240 | node = bp->data; | |
241 | INT_SET(node->hdr.info.back, ARCH_CONVERT, oldblk->blkno); | |
242 | xfs_da_log_buf(state->args->trans, bp, | |
243 | XFS_DA_LOGRANGE(node, &node->hdr.info, | |
244 | sizeof(node->hdr.info))); | |
245 | } | |
246 | node = oldblk->bp->data; | |
247 | if (INT_GET(node->hdr.info.back, ARCH_CONVERT)) { | |
248 | if (INT_GET(node->hdr.info.back, ARCH_CONVERT) == addblk->blkno) { | |
249 | bp = addblk->bp; | |
250 | } else { | |
251 | ASSERT(state->extravalid); | |
252 | bp = state->extrablk.bp; | |
253 | } | |
254 | node = bp->data; | |
255 | INT_SET(node->hdr.info.forw, ARCH_CONVERT, oldblk->blkno); | |
256 | xfs_da_log_buf(state->args->trans, bp, | |
257 | XFS_DA_LOGRANGE(node, &node->hdr.info, | |
258 | sizeof(node->hdr.info))); | |
259 | } | |
260 | xfs_da_buf_done(oldblk->bp); | |
261 | xfs_da_buf_done(addblk->bp); | |
262 | addblk->bp = NULL; | |
263 | return(0); | |
264 | } | |
265 | ||
266 | /* | |
267 | * Split the root. We have to create a new root and point to the two | |
268 | * parts (the split old root) that we just created. Copy block zero to | |
269 | * the EOF, extending the inode in process. | |
270 | */ | |
271 | STATIC int /* error */ | |
272 | xfs_da_root_split(xfs_da_state_t *state, xfs_da_state_blk_t *blk1, | |
273 | xfs_da_state_blk_t *blk2) | |
274 | { | |
275 | xfs_da_intnode_t *node, *oldroot; | |
276 | xfs_da_args_t *args; | |
277 | xfs_dablk_t blkno; | |
278 | xfs_dabuf_t *bp; | |
279 | int error, size; | |
280 | xfs_inode_t *dp; | |
281 | xfs_trans_t *tp; | |
282 | xfs_mount_t *mp; | |
283 | xfs_dir2_leaf_t *leaf; | |
284 | ||
285 | /* | |
286 | * Copy the existing (incorrect) block from the root node position | |
287 | * to a free space somewhere. | |
288 | */ | |
289 | args = state->args; | |
290 | ASSERT(args != NULL); | |
291 | error = xfs_da_grow_inode(args, &blkno); | |
292 | if (error) | |
293 | return(error); | |
294 | dp = args->dp; | |
295 | tp = args->trans; | |
296 | mp = state->mp; | |
297 | error = xfs_da_get_buf(tp, dp, blkno, -1, &bp, args->whichfork); | |
298 | if (error) | |
299 | return(error); | |
300 | ASSERT(bp != NULL); | |
301 | node = bp->data; | |
302 | oldroot = blk1->bp->data; | |
303 | if (INT_GET(oldroot->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) { | |
304 | size = (int)((char *)&oldroot->btree[INT_GET(oldroot->hdr.count, ARCH_CONVERT)] - | |
305 | (char *)oldroot); | |
306 | } else { | |
307 | ASSERT(XFS_DIR_IS_V2(mp)); | |
308 | ASSERT(INT_GET(oldroot->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); | |
309 | leaf = (xfs_dir2_leaf_t *)oldroot; | |
310 | size = (int)((char *)&leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT)] - | |
311 | (char *)leaf); | |
312 | } | |
313 | bcopy(oldroot, node, size); | |
314 | xfs_da_log_buf(tp, bp, 0, size - 1); | |
315 | xfs_da_buf_done(blk1->bp); | |
316 | blk1->bp = bp; | |
317 | blk1->blkno = blkno; | |
318 | ||
319 | /* | |
320 | * Set up the new root node. | |
321 | */ | |
322 | error = xfs_da_node_create(args, | |
323 | args->whichfork == XFS_DATA_FORK && | |
324 | XFS_DIR_IS_V2(mp) ? mp->m_dirleafblk : 0, | |
325 | INT_GET(node->hdr.level, ARCH_CONVERT) + 1, &bp, args->whichfork); | |
326 | if (error) | |
327 | return(error); | |
328 | node = bp->data; | |
329 | INT_SET(node->btree[0].hashval, ARCH_CONVERT, blk1->hashval); | |
330 | INT_SET(node->btree[0].before, ARCH_CONVERT, blk1->blkno); | |
331 | INT_SET(node->btree[1].hashval, ARCH_CONVERT, blk2->hashval); | |
332 | INT_SET(node->btree[1].before, ARCH_CONVERT, blk2->blkno); | |
333 | INT_SET(node->hdr.count, ARCH_CONVERT, 2); | |
334 | if (XFS_DIR_IS_V2(mp)) { | |
335 | ASSERT(blk1->blkno >= mp->m_dirleafblk && | |
336 | blk1->blkno < mp->m_dirfreeblk); | |
337 | ASSERT(blk2->blkno >= mp->m_dirleafblk && | |
338 | blk2->blkno < mp->m_dirfreeblk); | |
339 | } | |
340 | /* Header is already logged by xfs_da_node_create */ | |
341 | xfs_da_log_buf(tp, bp, | |
342 | XFS_DA_LOGRANGE(node, node->btree, | |
343 | sizeof(xfs_da_node_entry_t) * 2)); | |
344 | xfs_da_buf_done(bp); | |
345 | ||
346 | return(0); | |
347 | } | |
348 | ||
349 | /* | |
350 | * Split the node, rebalance, then add the new entry. | |
351 | */ | |
352 | STATIC int /* error */ | |
353 | xfs_da_node_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk, | |
354 | xfs_da_state_blk_t *newblk, | |
355 | xfs_da_state_blk_t *addblk, | |
356 | int treelevel, int *result) | |
357 | { | |
358 | xfs_da_intnode_t *node; | |
359 | xfs_dablk_t blkno; | |
360 | int newcount, error; | |
361 | int useextra; | |
362 | ||
363 | node = oldblk->bp->data; | |
364 | ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
365 | ||
366 | /* | |
367 | * With V2 the extra block is data or freespace. | |
368 | */ | |
369 | useextra = state->extravalid && XFS_DIR_IS_V1(state->mp); | |
370 | newcount = 1 + useextra; | |
371 | /* | |
372 | * Do we have to split the node? | |
373 | */ | |
374 | if ((INT_GET(node->hdr.count, ARCH_CONVERT) + newcount) > XFS_DA_NODE_ENTRIES(state->mp)) { | |
375 | /* | |
376 | * Allocate a new node, add to the doubly linked chain of | |
377 | * nodes, then move some of our excess entries into it. | |
378 | */ | |
379 | error = xfs_da_grow_inode(state->args, &blkno); | |
380 | if (error) | |
381 | return(error); /* GROT: dir is inconsistent */ | |
5000d01d | 382 | |
2bd0ea18 NS |
383 | error = xfs_da_node_create(state->args, blkno, treelevel, |
384 | &newblk->bp, state->args->whichfork); | |
385 | if (error) | |
386 | return(error); /* GROT: dir is inconsistent */ | |
387 | newblk->blkno = blkno; | |
388 | newblk->magic = XFS_DA_NODE_MAGIC; | |
389 | xfs_da_node_rebalance(state, oldblk, newblk); | |
390 | error = xfs_da_blk_link(state, oldblk, newblk); | |
391 | if (error) | |
392 | return(error); | |
393 | *result = 1; | |
394 | } else { | |
395 | *result = 0; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Insert the new entry(s) into the correct block | |
400 | * (updating last hashval in the process). | |
401 | * | |
402 | * xfs_da_node_add() inserts BEFORE the given index, | |
403 | * and as a result of using node_lookup_int() we always | |
404 | * point to a valid entry (not after one), but a split | |
405 | * operation always results in a new block whose hashvals | |
406 | * FOLLOW the current block. | |
407 | * | |
408 | * If we had double-split op below us, then add the extra block too. | |
409 | */ | |
410 | node = oldblk->bp->data; | |
411 | if (oldblk->index <= INT_GET(node->hdr.count, ARCH_CONVERT)) { | |
412 | oldblk->index++; | |
413 | xfs_da_node_add(state, oldblk, addblk); | |
414 | if (useextra) { | |
415 | if (state->extraafter) | |
416 | oldblk->index++; | |
417 | xfs_da_node_add(state, oldblk, &state->extrablk); | |
418 | state->extravalid = 0; | |
419 | } | |
420 | } else { | |
421 | newblk->index++; | |
422 | xfs_da_node_add(state, newblk, addblk); | |
423 | if (useextra) { | |
424 | if (state->extraafter) | |
425 | newblk->index++; | |
426 | xfs_da_node_add(state, newblk, &state->extrablk); | |
427 | state->extravalid = 0; | |
428 | } | |
429 | } | |
430 | ||
431 | return(0); | |
432 | } | |
433 | ||
434 | /* | |
435 | * Balance the btree elements between two intermediate nodes, | |
436 | * usually one full and one empty. | |
437 | * | |
438 | * NOTE: if blk2 is empty, then it will get the upper half of blk1. | |
439 | */ | |
440 | STATIC void | |
441 | xfs_da_node_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1, | |
442 | xfs_da_state_blk_t *blk2) | |
443 | { | |
444 | xfs_da_intnode_t *node1, *node2, *tmpnode; | |
445 | xfs_da_node_entry_t *btree_s, *btree_d; | |
446 | int count, tmp; | |
447 | xfs_trans_t *tp; | |
448 | ||
449 | node1 = blk1->bp->data; | |
450 | node2 = blk2->bp->data; | |
451 | /* | |
452 | * Figure out how many entries need to move, and in which direction. | |
453 | * Swap the nodes around if that makes it simpler. | |
454 | */ | |
455 | if ((INT_GET(node1->hdr.count, ARCH_CONVERT) > 0) && (INT_GET(node2->hdr.count, ARCH_CONVERT) > 0) && | |
456 | ((INT_GET(node2->btree[ 0 ].hashval, ARCH_CONVERT) < INT_GET(node1->btree[ 0 ].hashval, ARCH_CONVERT)) || | |
457 | (INT_GET(node2->btree[ INT_GET(node2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) < | |
458 | INT_GET(node1->btree[ INT_GET(node1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)))) { | |
459 | tmpnode = node1; | |
460 | node1 = node2; | |
461 | node2 = tmpnode; | |
462 | } | |
463 | ASSERT(INT_GET(node1->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
464 | ASSERT(INT_GET(node2->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
465 | count = (INT_GET(node1->hdr.count, ARCH_CONVERT) - INT_GET(node2->hdr.count, ARCH_CONVERT)) / 2; | |
466 | if (count == 0) | |
467 | return; | |
468 | tp = state->args->trans; | |
469 | /* | |
470 | * Two cases: high-to-low and low-to-high. | |
471 | */ | |
472 | if (count > 0) { | |
473 | /* | |
474 | * Move elements in node2 up to make a hole. | |
475 | */ | |
476 | if ((tmp = INT_GET(node2->hdr.count, ARCH_CONVERT)) > 0) { | |
477 | tmp *= (uint)sizeof(xfs_da_node_entry_t); | |
478 | btree_s = &node2->btree[0]; | |
479 | btree_d = &node2->btree[count]; | |
480 | ovbcopy(btree_s, btree_d, tmp); | |
481 | } | |
482 | ||
483 | /* | |
484 | * Move the req'd B-tree elements from high in node1 to | |
485 | * low in node2. | |
486 | */ | |
487 | INT_MOD(node2->hdr.count, ARCH_CONVERT, count); | |
488 | tmp = count * (uint)sizeof(xfs_da_node_entry_t); | |
489 | btree_s = &node1->btree[INT_GET(node1->hdr.count, ARCH_CONVERT) - count]; | |
490 | btree_d = &node2->btree[0]; | |
491 | bcopy(btree_s, btree_d, tmp); | |
492 | INT_MOD(node1->hdr.count, ARCH_CONVERT, -(count)); | |
493 | ||
494 | } else { | |
495 | /* | |
496 | * Move the req'd B-tree elements from low in node2 to | |
497 | * high in node1. | |
498 | */ | |
499 | count = -count; | |
500 | tmp = count * (uint)sizeof(xfs_da_node_entry_t); | |
501 | btree_s = &node2->btree[0]; | |
502 | btree_d = &node1->btree[INT_GET(node1->hdr.count, ARCH_CONVERT)]; | |
503 | bcopy(btree_s, btree_d, tmp); | |
504 | INT_MOD(node1->hdr.count, ARCH_CONVERT, count); | |
505 | xfs_da_log_buf(tp, blk1->bp, | |
506 | XFS_DA_LOGRANGE(node1, btree_d, tmp)); | |
507 | ||
508 | /* | |
509 | * Move elements in node2 down to fill the hole. | |
510 | */ | |
511 | tmp = INT_GET(node2->hdr.count, ARCH_CONVERT) - count; | |
512 | tmp *= (uint)sizeof(xfs_da_node_entry_t); | |
513 | btree_s = &node2->btree[count]; | |
514 | btree_d = &node2->btree[0]; | |
515 | ovbcopy(btree_s, btree_d, tmp); | |
516 | INT_MOD(node2->hdr.count, ARCH_CONVERT, -(count)); | |
517 | } | |
518 | ||
519 | /* | |
520 | * Log header of node 1 and all current bits of node 2. | |
521 | */ | |
522 | xfs_da_log_buf(tp, blk1->bp, | |
523 | XFS_DA_LOGRANGE(node1, &node1->hdr, sizeof(node1->hdr))); | |
524 | xfs_da_log_buf(tp, blk2->bp, | |
525 | XFS_DA_LOGRANGE(node2, &node2->hdr, | |
526 | sizeof(node2->hdr) + | |
527 | sizeof(node2->btree[0]) * INT_GET(node2->hdr.count, ARCH_CONVERT))); | |
528 | ||
529 | /* | |
530 | * Record the last hashval from each block for upward propagation. | |
531 | * (note: don't use the swapped node pointers) | |
532 | */ | |
533 | node1 = blk1->bp->data; | |
534 | node2 = blk2->bp->data; | |
535 | blk1->hashval = INT_GET(node1->btree[ INT_GET(node1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT); | |
536 | blk2->hashval = INT_GET(node2->btree[ INT_GET(node2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT); | |
537 | ||
538 | /* | |
539 | * Adjust the expected index for insertion. | |
540 | */ | |
541 | if (blk1->index >= INT_GET(node1->hdr.count, ARCH_CONVERT)) { | |
542 | blk2->index = blk1->index - INT_GET(node1->hdr.count, ARCH_CONVERT); | |
543 | blk1->index = INT_GET(node1->hdr.count, ARCH_CONVERT) + 1; /* make it invalid */ | |
544 | } | |
545 | } | |
546 | ||
547 | /* | |
548 | * Add a new entry to an intermediate node. | |
549 | */ | |
550 | STATIC void | |
551 | xfs_da_node_add(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk, | |
552 | xfs_da_state_blk_t *newblk) | |
553 | { | |
554 | xfs_da_intnode_t *node; | |
555 | xfs_da_node_entry_t *btree; | |
556 | int tmp; | |
557 | xfs_mount_t *mp; | |
558 | ||
559 | node = oldblk->bp->data; | |
560 | mp = state->mp; | |
561 | ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
562 | ASSERT((oldblk->index >= 0) && (oldblk->index <= INT_GET(node->hdr.count, ARCH_CONVERT))); | |
563 | ASSERT(newblk->blkno != 0); | |
564 | if (state->args->whichfork == XFS_DATA_FORK && XFS_DIR_IS_V2(mp)) | |
565 | ASSERT(newblk->blkno >= mp->m_dirleafblk && | |
566 | newblk->blkno < mp->m_dirfreeblk); | |
567 | ||
568 | /* | |
569 | * We may need to make some room before we insert the new node. | |
570 | */ | |
571 | tmp = 0; | |
572 | btree = &node->btree[ oldblk->index ]; | |
573 | if (oldblk->index < INT_GET(node->hdr.count, ARCH_CONVERT)) { | |
574 | tmp = (INT_GET(node->hdr.count, ARCH_CONVERT) - oldblk->index) * (uint)sizeof(*btree); | |
575 | ovbcopy(btree, btree + 1, tmp); | |
576 | } | |
577 | INT_SET(btree->hashval, ARCH_CONVERT, newblk->hashval); | |
578 | INT_SET(btree->before, ARCH_CONVERT, newblk->blkno); | |
579 | xfs_da_log_buf(state->args->trans, oldblk->bp, | |
580 | XFS_DA_LOGRANGE(node, btree, tmp + sizeof(*btree))); | |
581 | INT_MOD(node->hdr.count, ARCH_CONVERT, +1); | |
582 | xfs_da_log_buf(state->args->trans, oldblk->bp, | |
583 | XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr))); | |
584 | ||
585 | /* | |
586 | * Copy the last hash value from the oldblk to propagate upwards. | |
587 | */ | |
588 | oldblk->hashval = INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT); | |
589 | } | |
590 | ||
591 | /*======================================================================== | |
592 | * Routines used for shrinking the Btree. | |
593 | *========================================================================*/ | |
594 | ||
595 | /* | |
596 | * Deallocate an empty leaf node, remove it from its parent, | |
597 | * possibly deallocating that block, etc... | |
598 | */ | |
599 | int | |
600 | xfs_da_join(xfs_da_state_t *state) | |
601 | { | |
602 | xfs_da_state_blk_t *drop_blk, *save_blk; | |
603 | int action, error; | |
604 | ||
605 | action = 0; | |
606 | drop_blk = &state->path.blk[ state->path.active-1 ]; | |
607 | save_blk = &state->altpath.blk[ state->path.active-1 ]; | |
608 | ASSERT(state->path.blk[0].magic == XFS_DA_NODE_MAGIC); | |
609 | ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC || | |
610 | drop_blk->magic == XFS_DIRX_LEAF_MAGIC(state->mp)); | |
611 | ||
612 | /* | |
613 | * Walk back up the tree joining/deallocating as necessary. | |
614 | * When we stop dropping blocks, break out. | |
615 | */ | |
616 | for ( ; state->path.active >= 2; drop_blk--, save_blk--, | |
617 | state->path.active--) { | |
618 | /* | |
619 | * See if we can combine the block with a neighbor. | |
620 | * (action == 0) => no options, just leave | |
621 | * (action == 1) => coalesce, then unlink | |
622 | * (action == 2) => block empty, unlink it | |
623 | */ | |
624 | switch (drop_blk->magic) { | |
625 | case XFS_ATTR_LEAF_MAGIC: | |
626 | #ifndef __KERNEL__ | |
627 | error = ENOTTY; | |
628 | #else | |
629 | error = xfs_attr_leaf_toosmall(state, &action); | |
630 | #endif | |
631 | if (error) | |
632 | return(error); | |
633 | if (action == 0) | |
634 | return(0); | |
635 | #ifdef __KERNEL__ | |
636 | xfs_attr_leaf_unbalance(state, drop_blk, save_blk); | |
637 | #endif | |
638 | break; | |
639 | case XFS_DIR_LEAF_MAGIC: | |
640 | ASSERT(XFS_DIR_IS_V1(state->mp)); | |
641 | error = xfs_dir_leaf_toosmall(state, &action); | |
642 | if (error) | |
643 | return(error); | |
644 | if (action == 0) | |
645 | return(0); | |
646 | xfs_dir_leaf_unbalance(state, drop_blk, save_blk); | |
647 | break; | |
648 | case XFS_DIR2_LEAFN_MAGIC: | |
649 | ASSERT(XFS_DIR_IS_V2(state->mp)); | |
650 | error = xfs_dir2_leafn_toosmall(state, &action); | |
651 | if (error) | |
652 | return error; | |
653 | if (action == 0) | |
654 | return 0; | |
655 | xfs_dir2_leafn_unbalance(state, drop_blk, save_blk); | |
656 | break; | |
657 | case XFS_DA_NODE_MAGIC: | |
658 | /* | |
659 | * Remove the offending node, fixup hashvals, | |
660 | * check for a toosmall neighbor. | |
661 | */ | |
662 | xfs_da_node_remove(state, drop_blk); | |
663 | xfs_da_fixhashpath(state, &state->path); | |
664 | error = xfs_da_node_toosmall(state, &action); | |
665 | if (error) | |
666 | return(error); | |
667 | if (action == 0) | |
668 | return 0; | |
669 | xfs_da_node_unbalance(state, drop_blk, save_blk); | |
670 | break; | |
671 | } | |
672 | xfs_da_fixhashpath(state, &state->altpath); | |
673 | error = xfs_da_blk_unlink(state, drop_blk, save_blk); | |
674 | xfs_da_state_kill_altpath(state); | |
675 | if (error) | |
676 | return(error); | |
677 | error = xfs_da_shrink_inode(state->args, drop_blk->blkno, | |
678 | drop_blk->bp); | |
679 | drop_blk->bp = NULL; | |
680 | if (error) | |
681 | return(error); | |
682 | } | |
683 | /* | |
684 | * We joined all the way to the top. If it turns out that | |
685 | * we only have one entry in the root, make the child block | |
686 | * the new root. | |
687 | */ | |
688 | xfs_da_node_remove(state, drop_blk); | |
689 | xfs_da_fixhashpath(state, &state->path); | |
690 | error = xfs_da_root_join(state, &state->path.blk[0]); | |
691 | return(error); | |
692 | } | |
693 | ||
694 | /* | |
5000d01d | 695 | * We have only one entry in the root. Copy the only remaining child of |
2bd0ea18 NS |
696 | * the old root to block 0 as the new root node. |
697 | */ | |
698 | STATIC int | |
699 | xfs_da_root_join(xfs_da_state_t *state, xfs_da_state_blk_t *root_blk) | |
700 | { | |
701 | xfs_da_intnode_t *oldroot; | |
702 | /* REFERENCED */ | |
703 | xfs_da_blkinfo_t *blkinfo; | |
704 | xfs_da_args_t *args; | |
705 | xfs_dablk_t child; | |
706 | xfs_dabuf_t *bp; | |
707 | int error; | |
708 | ||
709 | args = state->args; | |
710 | ASSERT(args != NULL); | |
711 | ASSERT(root_blk->magic == XFS_DA_NODE_MAGIC); | |
712 | oldroot = root_blk->bp->data; | |
713 | ASSERT(INT_GET(oldroot->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
714 | ASSERT(INT_ISZERO(oldroot->hdr.info.forw, ARCH_CONVERT)); | |
715 | ASSERT(INT_ISZERO(oldroot->hdr.info.back, ARCH_CONVERT)); | |
716 | ||
717 | /* | |
718 | * If the root has more than one child, then don't do anything. | |
719 | */ | |
720 | if (INT_GET(oldroot->hdr.count, ARCH_CONVERT) > 1) | |
721 | return(0); | |
722 | ||
723 | /* | |
724 | * Read in the (only) child block, then copy those bytes into | |
725 | * the root block's buffer and free the original child block. | |
726 | */ | |
727 | child = INT_GET(oldroot->btree[ 0 ].before, ARCH_CONVERT); | |
728 | ASSERT(child != 0); | |
729 | error = xfs_da_read_buf(args->trans, args->dp, child, -1, &bp, | |
730 | args->whichfork); | |
731 | if (error) | |
732 | return(error); | |
733 | ASSERT(bp != NULL); | |
734 | blkinfo = bp->data; | |
735 | if (INT_GET(oldroot->hdr.level, ARCH_CONVERT) == 1) { | |
736 | ASSERT(INT_GET(blkinfo->magic, ARCH_CONVERT) == XFS_DIRX_LEAF_MAGIC(state->mp) || | |
737 | INT_GET(blkinfo->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC); | |
738 | } else { | |
739 | ASSERT(INT_GET(blkinfo->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
740 | } | |
5ce1d1f7 NS |
741 | ASSERT(INT_ISZERO(blkinfo->forw, ARCH_CONVERT)); |
742 | ASSERT(INT_ISZERO(blkinfo->back, ARCH_CONVERT)); | |
2bd0ea18 NS |
743 | bcopy(bp->data, root_blk->bp->data, state->blocksize); |
744 | xfs_da_log_buf(args->trans, root_blk->bp, 0, state->blocksize - 1); | |
745 | error = xfs_da_shrink_inode(args, child, bp); | |
746 | return(error); | |
747 | } | |
748 | ||
749 | /* | |
750 | * Check a node block and its neighbors to see if the block should be | |
751 | * collapsed into one or the other neighbor. Always keep the block | |
752 | * with the smaller block number. | |
753 | * If the current block is over 50% full, don't try to join it, return 0. | |
754 | * If the block is empty, fill in the state structure and return 2. | |
755 | * If it can be collapsed, fill in the state structure and return 1. | |
756 | * If nothing can be done, return 0. | |
757 | */ | |
758 | STATIC int | |
759 | xfs_da_node_toosmall(xfs_da_state_t *state, int *action) | |
760 | { | |
761 | xfs_da_intnode_t *node; | |
762 | xfs_da_state_blk_t *blk; | |
763 | xfs_da_blkinfo_t *info; | |
764 | int count, forward, error, retval, i; | |
765 | xfs_dablk_t blkno; | |
766 | xfs_dabuf_t *bp; | |
767 | ||
768 | /* | |
769 | * Check for the degenerate case of the block being over 50% full. | |
770 | * If so, it's not worth even looking to see if we might be able | |
771 | * to coalesce with a sibling. | |
772 | */ | |
773 | blk = &state->path.blk[ state->path.active-1 ]; | |
774 | info = blk->bp->data; | |
775 | ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
776 | node = (xfs_da_intnode_t *)info; | |
777 | count = INT_GET(node->hdr.count, ARCH_CONVERT); | |
778 | if (count > (XFS_DA_NODE_ENTRIES(state->mp) >> 1)) { | |
779 | *action = 0; /* blk over 50%, dont try to join */ | |
780 | return(0); /* blk over 50%, dont try to join */ | |
781 | } | |
782 | ||
783 | /* | |
784 | * Check for the degenerate case of the block being empty. | |
785 | * If the block is empty, we'll simply delete it, no need to | |
786 | * coalesce it with a sibling block. We choose (aribtrarily) | |
787 | * to merge with the forward block unless it is NULL. | |
788 | */ | |
789 | if (count == 0) { | |
790 | /* | |
791 | * Make altpath point to the block we want to keep and | |
792 | * path point to the block we want to drop (this one). | |
793 | */ | |
794 | forward = (!INT_ISZERO(info->forw, ARCH_CONVERT)); | |
795 | bcopy(&state->path, &state->altpath, sizeof(state->path)); | |
796 | error = xfs_da_path_shift(state, &state->altpath, forward, | |
797 | 0, &retval); | |
798 | if (error) | |
799 | return(error); | |
800 | if (retval) { | |
801 | *action = 0; | |
802 | } else { | |
803 | *action = 2; | |
804 | } | |
805 | return(0); | |
806 | } | |
807 | ||
808 | /* | |
809 | * Examine each sibling block to see if we can coalesce with | |
810 | * at least 25% free space to spare. We need to figure out | |
811 | * whether to merge with the forward or the backward block. | |
812 | * We prefer coalescing with the lower numbered sibling so as | |
813 | * to shrink a directory over time. | |
814 | */ | |
815 | /* start with smaller blk num */ | |
816 | forward = (INT_GET(info->forw, ARCH_CONVERT) | |
817 | < INT_GET(info->back, ARCH_CONVERT)); | |
818 | for (i = 0; i < 2; forward = !forward, i++) { | |
819 | if (forward) | |
820 | blkno = INT_GET(info->forw, ARCH_CONVERT); | |
821 | else | |
822 | blkno = INT_GET(info->back, ARCH_CONVERT); | |
823 | if (blkno == 0) | |
824 | continue; | |
825 | error = xfs_da_read_buf(state->args->trans, state->args->dp, | |
826 | blkno, -1, &bp, state->args->whichfork); | |
827 | if (error) | |
828 | return(error); | |
829 | ASSERT(bp != NULL); | |
830 | ||
831 | node = (xfs_da_intnode_t *)info; | |
832 | count = XFS_DA_NODE_ENTRIES(state->mp); | |
833 | count -= XFS_DA_NODE_ENTRIES(state->mp) >> 2; | |
834 | count -= INT_GET(node->hdr.count, ARCH_CONVERT); | |
835 | node = bp->data; | |
836 | ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
837 | count -= INT_GET(node->hdr.count, ARCH_CONVERT); | |
838 | xfs_da_brelse(state->args->trans, bp); | |
839 | if (count >= 0) | |
840 | break; /* fits with at least 25% to spare */ | |
841 | } | |
842 | if (i >= 2) { | |
843 | *action = 0; | |
844 | return(0); | |
845 | } | |
846 | ||
847 | /* | |
848 | * Make altpath point to the block we want to keep (the lower | |
849 | * numbered block) and path point to the block we want to drop. | |
850 | */ | |
851 | bcopy(&state->path, &state->altpath, sizeof(state->path)); | |
852 | if (blkno < blk->blkno) { | |
853 | error = xfs_da_path_shift(state, &state->altpath, forward, | |
854 | 0, &retval); | |
855 | if (error) { | |
856 | return(error); | |
857 | } | |
858 | if (retval) { | |
859 | *action = 0; | |
860 | return(0); | |
861 | } | |
862 | } else { | |
863 | error = xfs_da_path_shift(state, &state->path, forward, | |
864 | 0, &retval); | |
865 | if (error) { | |
866 | return(error); | |
867 | } | |
868 | if (retval) { | |
869 | *action = 0; | |
870 | return(0); | |
871 | } | |
872 | } | |
873 | *action = 1; | |
874 | return(0); | |
875 | } | |
876 | ||
877 | ||
878 | /* | |
879 | * Walk back up the tree adjusting hash values as necessary, | |
880 | * when we stop making changes, return. | |
881 | */ | |
882 | void | |
883 | xfs_da_fixhashpath(xfs_da_state_t *state, xfs_da_state_path_t *path) | |
884 | { | |
885 | xfs_da_state_blk_t *blk; | |
886 | xfs_da_intnode_t *node; | |
887 | xfs_da_node_entry_t *btree; | |
0e266570 | 888 | xfs_dahash_t lasthash=0; |
2bd0ea18 NS |
889 | int level, count; |
890 | ||
891 | level = path->active-1; | |
892 | blk = &path->blk[ level ]; | |
893 | switch (blk->magic) { | |
894 | #ifdef __KERNEL__ | |
895 | case XFS_ATTR_LEAF_MAGIC: | |
896 | lasthash = xfs_attr_leaf_lasthash(blk->bp, &count); | |
897 | if (count == 0) | |
898 | return; | |
899 | break; | |
900 | #endif | |
901 | case XFS_DIR_LEAF_MAGIC: | |
902 | ASSERT(XFS_DIR_IS_V1(state->mp)); | |
903 | lasthash = xfs_dir_leaf_lasthash(blk->bp, &count); | |
904 | if (count == 0) | |
905 | return; | |
906 | break; | |
907 | case XFS_DIR2_LEAFN_MAGIC: | |
908 | ASSERT(XFS_DIR_IS_V2(state->mp)); | |
909 | lasthash = xfs_dir2_leafn_lasthash(blk->bp, &count); | |
910 | if (count == 0) | |
911 | return; | |
912 | break; | |
913 | case XFS_DA_NODE_MAGIC: | |
914 | lasthash = xfs_da_node_lasthash(blk->bp, &count); | |
915 | if (count == 0) | |
916 | return; | |
917 | break; | |
918 | } | |
919 | for (blk--, level--; level >= 0; blk--, level--) { | |
920 | node = blk->bp->data; | |
921 | ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
922 | btree = &node->btree[ blk->index ]; | |
923 | if (INT_GET(btree->hashval, ARCH_CONVERT) == lasthash) | |
924 | break; | |
925 | blk->hashval = lasthash; | |
5000d01d | 926 | INT_SET(btree->hashval, ARCH_CONVERT, lasthash); |
2bd0ea18 NS |
927 | xfs_da_log_buf(state->args->trans, blk->bp, |
928 | XFS_DA_LOGRANGE(node, btree, sizeof(*btree))); | |
929 | ||
930 | lasthash = INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT); | |
931 | } | |
932 | } | |
933 | ||
934 | ||
935 | ||
936 | /* | |
937 | * Remove an entry from an intermediate node. | |
938 | */ | |
939 | STATIC void | |
940 | xfs_da_node_remove(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk) | |
941 | { | |
942 | xfs_da_intnode_t *node; | |
943 | xfs_da_node_entry_t *btree; | |
944 | int tmp; | |
945 | ||
946 | node = drop_blk->bp->data; | |
947 | ASSERT(drop_blk->index < INT_GET(node->hdr.count, ARCH_CONVERT)); | |
948 | ASSERT(drop_blk->index >= 0); | |
949 | ||
950 | /* | |
951 | * Copy over the offending entry, or just zero it out. | |
952 | */ | |
953 | btree = &node->btree[drop_blk->index]; | |
954 | if (drop_blk->index < (INT_GET(node->hdr.count, ARCH_CONVERT)-1)) { | |
955 | tmp = INT_GET(node->hdr.count, ARCH_CONVERT) - drop_blk->index - 1; | |
956 | tmp *= (uint)sizeof(xfs_da_node_entry_t); | |
957 | ovbcopy(btree + 1, btree, tmp); | |
958 | xfs_da_log_buf(state->args->trans, drop_blk->bp, | |
959 | XFS_DA_LOGRANGE(node, btree, tmp)); | |
960 | btree = &node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ]; | |
961 | } | |
962 | bzero((char *)btree, sizeof(xfs_da_node_entry_t)); | |
963 | xfs_da_log_buf(state->args->trans, drop_blk->bp, | |
964 | XFS_DA_LOGRANGE(node, btree, sizeof(*btree))); | |
965 | INT_MOD(node->hdr.count, ARCH_CONVERT, -1); | |
966 | xfs_da_log_buf(state->args->trans, drop_blk->bp, | |
967 | XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr))); | |
968 | ||
969 | /* | |
970 | * Copy the last hash value from the block to propagate upwards. | |
971 | */ | |
972 | btree--; | |
973 | drop_blk->hashval = INT_GET(btree->hashval, ARCH_CONVERT); | |
974 | } | |
975 | ||
976 | /* | |
977 | * Unbalance the btree elements between two intermediate nodes, | |
978 | * move all Btree elements from one node into another. | |
979 | */ | |
980 | STATIC void | |
981 | xfs_da_node_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk, | |
982 | xfs_da_state_blk_t *save_blk) | |
983 | { | |
984 | xfs_da_intnode_t *drop_node, *save_node; | |
985 | xfs_da_node_entry_t *btree; | |
986 | int tmp; | |
987 | xfs_trans_t *tp; | |
988 | ||
989 | drop_node = drop_blk->bp->data; | |
990 | save_node = save_blk->bp->data; | |
991 | ASSERT(INT_GET(drop_node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
992 | ASSERT(INT_GET(save_node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
993 | tp = state->args->trans; | |
994 | ||
995 | /* | |
996 | * If the dying block has lower hashvals, then move all the | |
997 | * elements in the remaining block up to make a hole. | |
998 | */ | |
999 | if ((INT_GET(drop_node->btree[ 0 ].hashval, ARCH_CONVERT) < INT_GET(save_node->btree[ 0 ].hashval, ARCH_CONVERT)) || | |
1000 | (INT_GET(drop_node->btree[ INT_GET(drop_node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) < | |
1001 | INT_GET(save_node->btree[ INT_GET(save_node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT))) | |
1002 | { | |
1003 | btree = &save_node->btree[ INT_GET(drop_node->hdr.count, ARCH_CONVERT) ]; | |
1004 | tmp = INT_GET(save_node->hdr.count, ARCH_CONVERT) * (uint)sizeof(xfs_da_node_entry_t); | |
1005 | ovbcopy(&save_node->btree[0], btree, tmp); | |
1006 | btree = &save_node->btree[0]; | |
1007 | xfs_da_log_buf(tp, save_blk->bp, | |
1008 | XFS_DA_LOGRANGE(save_node, btree, | |
1009 | (INT_GET(save_node->hdr.count, ARCH_CONVERT) + INT_GET(drop_node->hdr.count, ARCH_CONVERT)) * | |
1010 | sizeof(xfs_da_node_entry_t))); | |
1011 | } else { | |
1012 | btree = &save_node->btree[ INT_GET(save_node->hdr.count, ARCH_CONVERT) ]; | |
1013 | xfs_da_log_buf(tp, save_blk->bp, | |
1014 | XFS_DA_LOGRANGE(save_node, btree, | |
1015 | INT_GET(drop_node->hdr.count, ARCH_CONVERT) * | |
1016 | sizeof(xfs_da_node_entry_t))); | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * Move all the B-tree elements from drop_blk to save_blk. | |
1021 | */ | |
1022 | tmp = INT_GET(drop_node->hdr.count, ARCH_CONVERT) * (uint)sizeof(xfs_da_node_entry_t); | |
1023 | bcopy(&drop_node->btree[0], btree, tmp); | |
1024 | INT_MOD(save_node->hdr.count, ARCH_CONVERT, INT_GET(drop_node->hdr.count, ARCH_CONVERT)); | |
1025 | ||
1026 | xfs_da_log_buf(tp, save_blk->bp, | |
1027 | XFS_DA_LOGRANGE(save_node, &save_node->hdr, | |
1028 | sizeof(save_node->hdr))); | |
1029 | ||
1030 | /* | |
1031 | * Save the last hashval in the remaining block for upward propagation. | |
1032 | */ | |
1033 | save_blk->hashval = INT_GET(save_node->btree[ INT_GET(save_node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT); | |
1034 | } | |
1035 | ||
1036 | ||
1037 | /*======================================================================== | |
1038 | * Routines used for finding things in the Btree. | |
1039 | *========================================================================*/ | |
1040 | ||
1041 | /* | |
1042 | * Walk down the Btree looking for a particular filename, filling | |
1043 | * in the state structure as we go. | |
1044 | * | |
1045 | * We will set the state structure to point to each of the elements | |
1046 | * in each of the nodes where either the hashval is or should be. | |
1047 | * | |
1048 | * We support duplicate hashval's so for each entry in the current | |
1049 | * node that could contain the desired hashval, descend. This is a | |
1050 | * pruned depth-first tree search. | |
1051 | */ | |
1052 | int /* error */ | |
1053 | xfs_da_node_lookup_int(xfs_da_state_t *state, int *result) | |
1054 | { | |
1055 | xfs_da_state_blk_t *blk; | |
1056 | xfs_da_blkinfo_t *curr; | |
1057 | xfs_da_intnode_t *node; | |
1058 | xfs_da_node_entry_t *btree; | |
1059 | xfs_dablk_t blkno; | |
1060 | int probe, span, max, error, retval; | |
1061 | xfs_dahash_t hashval; | |
1062 | xfs_da_args_t *args; | |
1063 | ||
1064 | args = state->args; | |
1065 | /* | |
1066 | * Descend thru the B-tree searching each level for the right | |
1067 | * node to use, until the right hashval is found. | |
1068 | */ | |
1069 | if (args->whichfork == XFS_DATA_FORK && XFS_DIR_IS_V2(state->mp)) | |
1070 | blkno = state->mp->m_dirleafblk; | |
1071 | else | |
1072 | blkno = 0; | |
1073 | for (blk = &state->path.blk[0], state->path.active = 1; | |
1074 | state->path.active <= XFS_DA_NODE_MAXDEPTH; | |
1075 | blk++, state->path.active++) { | |
1076 | /* | |
1077 | * Read the next node down in the tree. | |
1078 | */ | |
1079 | blk->blkno = blkno; | |
1080 | error = xfs_da_read_buf(state->args->trans, state->args->dp, | |
1081 | blkno, -1, &blk->bp, | |
1082 | state->args->whichfork); | |
1083 | if (error) { | |
1084 | blk->blkno = 0; | |
1085 | state->path.active--; | |
1086 | return(error); | |
1087 | } | |
1088 | ASSERT(blk->bp != NULL); | |
1089 | curr = blk->bp->data; | |
1090 | ASSERT(INT_GET(curr->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC || | |
1091 | INT_GET(curr->magic, ARCH_CONVERT) == XFS_DIRX_LEAF_MAGIC(state->mp) || | |
1092 | INT_GET(curr->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC); | |
1093 | ||
1094 | /* | |
1095 | * Search an intermediate node for a match. | |
1096 | */ | |
1097 | blk->magic = INT_GET(curr->magic, ARCH_CONVERT); | |
1098 | if (INT_GET(curr->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) { | |
1099 | node = blk->bp->data; | |
1100 | blk->hashval = INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT); | |
1101 | ||
1102 | /* | |
1103 | * Binary search. (note: small blocks will skip loop) | |
1104 | */ | |
1105 | max = INT_GET(node->hdr.count, ARCH_CONVERT); | |
1106 | probe = span = max / 2; | |
1107 | hashval = state->args->hashval; | |
1108 | for (btree = &node->btree[probe]; span > 4; | |
1109 | btree = &node->btree[probe]) { | |
1110 | span /= 2; | |
1111 | if (INT_GET(btree->hashval, ARCH_CONVERT) < hashval) | |
1112 | probe += span; | |
1113 | else if (INT_GET(btree->hashval, ARCH_CONVERT) > hashval) | |
1114 | probe -= span; | |
1115 | else | |
1116 | break; | |
1117 | } | |
1118 | ASSERT((probe >= 0) && (probe < max)); | |
1119 | ASSERT((span <= 4) || (INT_GET(btree->hashval, ARCH_CONVERT) == hashval)); | |
1120 | ||
1121 | /* | |
1122 | * Since we may have duplicate hashval's, find the first | |
1123 | * matching hashval in the node. | |
1124 | */ | |
1125 | while ((probe > 0) && (INT_GET(btree->hashval, ARCH_CONVERT) >= hashval)) { | |
1126 | btree--; | |
1127 | probe--; | |
1128 | } | |
1129 | while ((probe < max) && (INT_GET(btree->hashval, ARCH_CONVERT) < hashval)) { | |
1130 | btree++; | |
1131 | probe++; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Pick the right block to descend on. | |
1136 | */ | |
1137 | if (probe == max) { | |
1138 | blk->index = max-1; | |
1139 | blkno = INT_GET(node->btree[ max-1 ].before, ARCH_CONVERT); | |
1140 | } else { | |
1141 | blk->index = probe; | |
5000d01d | 1142 | blkno = INT_GET(btree->before, ARCH_CONVERT); |
2bd0ea18 NS |
1143 | } |
1144 | } | |
1145 | #ifdef __KERNEL__ | |
1146 | else if (INT_GET(curr->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC) { | |
1147 | blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL); | |
1148 | break; | |
1149 | } | |
1150 | #endif | |
1151 | else if (INT_GET(curr->magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC) { | |
1152 | blk->hashval = xfs_dir_leaf_lasthash(blk->bp, NULL); | |
1153 | break; | |
1154 | } | |
1155 | else if (INT_GET(curr->magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC) { | |
1156 | blk->hashval = xfs_dir2_leafn_lasthash(blk->bp, NULL); | |
1157 | break; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * A leaf block that ends in the hashval that we are interested in | |
1163 | * (final hashval == search hashval) means that the next block may | |
1164 | * contain more entries with the same hashval, shift upward to the | |
1165 | * next leaf and keep searching. | |
1166 | */ | |
1167 | for (;;) { | |
1168 | if (blk->magic == XFS_DIR_LEAF_MAGIC) { | |
1169 | ASSERT(XFS_DIR_IS_V1(state->mp)); | |
1170 | retval = xfs_dir_leaf_lookup_int(blk->bp, state->args, | |
1171 | &blk->index); | |
1172 | } else if (blk->magic == XFS_DIR2_LEAFN_MAGIC) { | |
1173 | ASSERT(XFS_DIR_IS_V2(state->mp)); | |
1174 | retval = xfs_dir2_leafn_lookup_int(blk->bp, state->args, | |
1175 | &blk->index, state); | |
1176 | } | |
1177 | #ifdef __KERNEL__ | |
1178 | else if (blk->magic == XFS_ATTR_LEAF_MAGIC) { | |
1179 | retval = xfs_attr_leaf_lookup_int(blk->bp, state->args); | |
1180 | blk->index = state->args->index; | |
1181 | state->args->blkno = blk->blkno; | |
1182 | } | |
1183 | #endif | |
1184 | if (((retval == ENOENT) || (retval == ENOATTR)) && | |
1185 | (blk->hashval == state->args->hashval)) { | |
1186 | error = xfs_da_path_shift(state, &state->path, 1, 1, | |
1187 | &retval); | |
1188 | if (error) | |
1189 | return(error); | |
1190 | if (retval == 0) { | |
1191 | continue; | |
1192 | } | |
1193 | #ifdef __KERNEL__ | |
1194 | else if (blk->magic == XFS_ATTR_LEAF_MAGIC) { | |
1195 | /* path_shift() gives ENOENT */ | |
1196 | retval = XFS_ERROR(ENOATTR); | |
1197 | } | |
1198 | #endif | |
1199 | } | |
1200 | break; | |
1201 | } | |
1202 | *result = retval; | |
5000d01d | 1203 | return(0); |
2bd0ea18 NS |
1204 | } |
1205 | ||
1206 | ||
1207 | /*======================================================================== | |
1208 | * Utility routines. | |
1209 | *========================================================================*/ | |
1210 | ||
1211 | /* | |
1212 | * Link a new block into a doubly linked list of blocks (of whatever type). | |
1213 | */ | |
1214 | int /* error */ | |
1215 | xfs_da_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk, | |
1216 | xfs_da_state_blk_t *new_blk) | |
1217 | { | |
1218 | xfs_da_blkinfo_t *old_info, *new_info, *tmp_info; | |
1219 | xfs_da_args_t *args; | |
0e266570 | 1220 | int before=0, error; |
2bd0ea18 NS |
1221 | xfs_dabuf_t *bp; |
1222 | ||
1223 | /* | |
1224 | * Set up environment. | |
1225 | */ | |
1226 | args = state->args; | |
1227 | ASSERT(args != NULL); | |
1228 | old_info = old_blk->bp->data; | |
1229 | new_info = new_blk->bp->data; | |
1230 | ASSERT(old_blk->magic == XFS_DA_NODE_MAGIC || | |
1231 | old_blk->magic == XFS_DIRX_LEAF_MAGIC(state->mp) || | |
1232 | old_blk->magic == XFS_ATTR_LEAF_MAGIC); | |
1233 | ASSERT(old_blk->magic == INT_GET(old_info->magic, ARCH_CONVERT)); | |
1234 | ASSERT(new_blk->magic == INT_GET(new_info->magic, ARCH_CONVERT)); | |
1235 | ASSERT(old_blk->magic == new_blk->magic); | |
1236 | ||
1237 | switch (old_blk->magic) { | |
1238 | #ifdef __KERNEL__ | |
1239 | case XFS_ATTR_LEAF_MAGIC: | |
1240 | before = xfs_attr_leaf_order(old_blk->bp, new_blk->bp); | |
1241 | break; | |
1242 | #endif | |
1243 | case XFS_DIR_LEAF_MAGIC: | |
1244 | ASSERT(XFS_DIR_IS_V1(state->mp)); | |
1245 | before = xfs_dir_leaf_order(old_blk->bp, new_blk->bp); | |
1246 | break; | |
1247 | case XFS_DIR2_LEAFN_MAGIC: | |
1248 | ASSERT(XFS_DIR_IS_V2(state->mp)); | |
1249 | before = xfs_dir2_leafn_order(old_blk->bp, new_blk->bp); | |
1250 | break; | |
1251 | case XFS_DA_NODE_MAGIC: | |
1252 | before = xfs_da_node_order(old_blk->bp, new_blk->bp); | |
1253 | break; | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * Link blocks in appropriate order. | |
1258 | */ | |
1259 | if (before) { | |
1260 | /* | |
1261 | * Link new block in before existing block. | |
1262 | */ | |
1263 | INT_SET(new_info->forw, ARCH_CONVERT, old_blk->blkno); | |
1264 | new_info->back = old_info->back; /* INT_: direct copy */ | |
1265 | if (INT_GET(old_info->back, ARCH_CONVERT)) { | |
1266 | error = xfs_da_read_buf(args->trans, args->dp, | |
1267 | INT_GET(old_info->back, | |
1268 | ARCH_CONVERT), -1, &bp, | |
1269 | args->whichfork); | |
1270 | if (error) | |
1271 | return(error); | |
1272 | ASSERT(bp != NULL); | |
1273 | tmp_info = bp->data; | |
1274 | ASSERT(INT_GET(tmp_info->magic, ARCH_CONVERT) == INT_GET(old_info->magic, ARCH_CONVERT)); | |
1275 | ASSERT(INT_GET(tmp_info->forw, ARCH_CONVERT) == old_blk->blkno); | |
1276 | INT_SET(tmp_info->forw, ARCH_CONVERT, new_blk->blkno); | |
1277 | xfs_da_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1); | |
1278 | xfs_da_buf_done(bp); | |
1279 | } | |
1280 | INT_SET(old_info->back, ARCH_CONVERT, new_blk->blkno); | |
1281 | } else { | |
1282 | /* | |
1283 | * Link new block in after existing block. | |
1284 | */ | |
1285 | new_info->forw = old_info->forw; /* INT_: direct copy */ | |
1286 | INT_SET(new_info->back, ARCH_CONVERT, old_blk->blkno); | |
1287 | if (INT_GET(old_info->forw, ARCH_CONVERT)) { | |
1288 | error = xfs_da_read_buf(args->trans, args->dp, | |
1289 | INT_GET(old_info->forw, ARCH_CONVERT), -1, &bp, | |
1290 | args->whichfork); | |
1291 | if (error) | |
1292 | return(error); | |
1293 | ASSERT(bp != NULL); | |
1294 | tmp_info = bp->data; | |
1295 | ASSERT(INT_GET(tmp_info->magic, ARCH_CONVERT) | |
1296 | == INT_GET(old_info->magic, ARCH_CONVERT)); | |
1297 | ASSERT(INT_GET(tmp_info->back, ARCH_CONVERT) | |
1298 | == old_blk->blkno); | |
1299 | INT_SET(tmp_info->back, ARCH_CONVERT, new_blk->blkno); | |
1300 | xfs_da_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1); | |
1301 | xfs_da_buf_done(bp); | |
1302 | } | |
1303 | INT_SET(old_info->forw, ARCH_CONVERT, new_blk->blkno); | |
1304 | } | |
1305 | ||
1306 | xfs_da_log_buf(args->trans, old_blk->bp, 0, sizeof(*tmp_info) - 1); | |
1307 | xfs_da_log_buf(args->trans, new_blk->bp, 0, sizeof(*tmp_info) - 1); | |
1308 | return(0); | |
1309 | } | |
1310 | ||
1311 | ||
1312 | /* | |
1313 | * Compare two intermediate nodes for "order". | |
1314 | */ | |
1315 | STATIC int | |
1316 | xfs_da_node_order(xfs_dabuf_t *node1_bp, xfs_dabuf_t *node2_bp) | |
1317 | { | |
1318 | xfs_da_intnode_t *node1, *node2; | |
1319 | ||
1320 | node1 = node1_bp->data; | |
1321 | node2 = node2_bp->data; | |
1322 | ASSERT((INT_GET(node1->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) && | |
1323 | (INT_GET(node2->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC)); | |
5000d01d | 1324 | if ((INT_GET(node1->hdr.count, ARCH_CONVERT) > 0) && (INT_GET(node2->hdr.count, ARCH_CONVERT) > 0) && |
2bd0ea18 NS |
1325 | ((INT_GET(node2->btree[ 0 ].hashval, ARCH_CONVERT) < |
1326 | INT_GET(node1->btree[ 0 ].hashval, ARCH_CONVERT)) || | |
1327 | (INT_GET(node2->btree[ INT_GET(node2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) < | |
1328 | INT_GET(node1->btree[ INT_GET(node1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)))) { | |
1329 | return(1); | |
1330 | } | |
1331 | return(0); | |
1332 | } | |
1333 | ||
1334 | ||
1335 | /* | |
1336 | * Pick up the last hashvalue from an intermediate node. | |
1337 | */ | |
1338 | STATIC uint | |
1339 | xfs_da_node_lasthash(xfs_dabuf_t *bp, int *count) | |
1340 | { | |
1341 | xfs_da_intnode_t *node; | |
1342 | ||
1343 | node = bp->data; | |
1344 | ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
1345 | if (count) | |
1346 | *count = INT_GET(node->hdr.count, ARCH_CONVERT); | |
5ce1d1f7 | 1347 | if (INT_ISZERO(node->hdr.count, ARCH_CONVERT)) |
2bd0ea18 NS |
1348 | return(0); |
1349 | return(INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)); | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Unlink a block from a doubly linked list of blocks. | |
1354 | */ | |
1355 | int /* error */ | |
1356 | xfs_da_blk_unlink(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk, | |
1357 | xfs_da_state_blk_t *save_blk) | |
1358 | { | |
1359 | xfs_da_blkinfo_t *drop_info, *save_info, *tmp_info; | |
1360 | xfs_da_args_t *args; | |
1361 | xfs_dabuf_t *bp; | |
1362 | int error; | |
1363 | ||
1364 | /* | |
1365 | * Set up environment. | |
1366 | */ | |
1367 | args = state->args; | |
1368 | ASSERT(args != NULL); | |
1369 | save_info = save_blk->bp->data; | |
1370 | drop_info = drop_blk->bp->data; | |
1371 | ASSERT(save_blk->magic == XFS_DA_NODE_MAGIC || | |
1372 | save_blk->magic == XFS_DIRX_LEAF_MAGIC(state->mp) || | |
1373 | save_blk->magic == XFS_ATTR_LEAF_MAGIC); | |
1374 | ASSERT(save_blk->magic == INT_GET(save_info->magic, ARCH_CONVERT)); | |
1375 | ASSERT(drop_blk->magic == INT_GET(drop_info->magic, ARCH_CONVERT)); | |
1376 | ASSERT(save_blk->magic == drop_blk->magic); | |
1377 | ASSERT((INT_GET(save_info->forw, ARCH_CONVERT) == drop_blk->blkno) || | |
1378 | (INT_GET(save_info->back, ARCH_CONVERT) == drop_blk->blkno)); | |
1379 | ASSERT((INT_GET(drop_info->forw, ARCH_CONVERT) == save_blk->blkno) || | |
1380 | (INT_GET(drop_info->back, ARCH_CONVERT) == save_blk->blkno)); | |
1381 | ||
1382 | /* | |
1383 | * Unlink the leaf block from the doubly linked chain of leaves. | |
1384 | */ | |
1385 | if (INT_GET(save_info->back, ARCH_CONVERT) == drop_blk->blkno) { | |
1386 | save_info->back = drop_info->back; /* INT_: direct copy */ | |
1387 | if (INT_GET(drop_info->back, ARCH_CONVERT)) { | |
1388 | error = xfs_da_read_buf(args->trans, args->dp, | |
1389 | INT_GET(drop_info->back, | |
1390 | ARCH_CONVERT), -1, &bp, | |
1391 | args->whichfork); | |
1392 | if (error) | |
1393 | return(error); | |
1394 | ASSERT(bp != NULL); | |
1395 | tmp_info = bp->data; | |
1396 | ASSERT(INT_GET(tmp_info->magic, ARCH_CONVERT) == INT_GET(save_info->magic, ARCH_CONVERT)); | |
1397 | ASSERT(INT_GET(tmp_info->forw, ARCH_CONVERT) == drop_blk->blkno); | |
1398 | INT_SET(tmp_info->forw, ARCH_CONVERT, save_blk->blkno); | |
1399 | xfs_da_log_buf(args->trans, bp, 0, | |
1400 | sizeof(*tmp_info) - 1); | |
1401 | xfs_da_buf_done(bp); | |
1402 | } | |
1403 | } else { | |
1404 | save_info->forw = drop_info->forw; /* INT_: direct copy */ | |
1405 | if (INT_GET(drop_info->forw, ARCH_CONVERT)) { | |
1406 | error = xfs_da_read_buf(args->trans, args->dp, | |
1407 | INT_GET(drop_info->forw, ARCH_CONVERT), -1, &bp, | |
1408 | args->whichfork); | |
1409 | if (error) | |
1410 | return(error); | |
1411 | ASSERT(bp != NULL); | |
1412 | tmp_info = bp->data; | |
1413 | ASSERT(INT_GET(tmp_info->magic, ARCH_CONVERT) | |
1414 | == INT_GET(save_info->magic, ARCH_CONVERT)); | |
1415 | ASSERT(INT_GET(tmp_info->back, ARCH_CONVERT) | |
1416 | == drop_blk->blkno); | |
1417 | INT_SET(tmp_info->back, ARCH_CONVERT, save_blk->blkno); | |
1418 | xfs_da_log_buf(args->trans, bp, 0, | |
1419 | sizeof(*tmp_info) - 1); | |
1420 | xfs_da_buf_done(bp); | |
1421 | } | |
1422 | } | |
1423 | ||
1424 | xfs_da_log_buf(args->trans, save_blk->bp, 0, sizeof(*save_info) - 1); | |
1425 | return(0); | |
1426 | } | |
1427 | ||
1428 | /* | |
1429 | * Move a path "forward" or "!forward" one block at the current level. | |
1430 | * | |
1431 | * This routine will adjust a "path" to point to the next block | |
1432 | * "forward" (higher hashvalues) or "!forward" (lower hashvals) in the | |
1433 | * Btree, including updating pointers to the intermediate nodes between | |
1434 | * the new bottom and the root. | |
1435 | */ | |
1436 | int /* error */ | |
1437 | xfs_da_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path, | |
1438 | int forward, int release, int *result) | |
1439 | { | |
1440 | xfs_da_state_blk_t *blk; | |
1441 | xfs_da_blkinfo_t *info; | |
1442 | xfs_da_intnode_t *node; | |
1443 | xfs_da_args_t *args; | |
0e266570 | 1444 | xfs_dablk_t blkno=0; |
2bd0ea18 NS |
1445 | int level, error; |
1446 | ||
1447 | /* | |
1448 | * Roll up the Btree looking for the first block where our | |
1449 | * current index is not at the edge of the block. Note that | |
1450 | * we skip the bottom layer because we want the sibling block. | |
1451 | */ | |
1452 | args = state->args; | |
1453 | ASSERT(args != NULL); | |
1454 | ASSERT(path != NULL); | |
1455 | ASSERT((path->active > 0) && (path->active < XFS_DA_NODE_MAXDEPTH)); | |
1456 | level = (path->active-1) - 1; /* skip bottom layer in path */ | |
1457 | for (blk = &path->blk[level]; level >= 0; blk--, level--) { | |
1458 | ASSERT(blk->bp != NULL); | |
1459 | node = blk->bp->data; | |
1460 | ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
1461 | if (forward && (blk->index < INT_GET(node->hdr.count, ARCH_CONVERT)-1)) { | |
1462 | blk->index++; | |
1463 | blkno = INT_GET(node->btree[ blk->index ].before, ARCH_CONVERT); | |
1464 | break; | |
1465 | } else if (!forward && (blk->index > 0)) { | |
1466 | blk->index--; | |
1467 | blkno = INT_GET(node->btree[ blk->index ].before, ARCH_CONVERT); | |
1468 | break; | |
1469 | } | |
1470 | } | |
1471 | if (level < 0) { | |
1472 | *result = XFS_ERROR(ENOENT); /* we're out of our tree */ | |
1473 | ASSERT(args->oknoent); | |
1474 | return(0); | |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * Roll down the edge of the subtree until we reach the | |
1479 | * same depth we were at originally. | |
1480 | */ | |
1481 | for (blk++, level++; level < path->active; blk++, level++) { | |
1482 | /* | |
1483 | * Release the old block. | |
1484 | * (if it's dirty, trans won't actually let go) | |
1485 | */ | |
1486 | if (release) | |
1487 | xfs_da_brelse(args->trans, blk->bp); | |
1488 | ||
1489 | /* | |
1490 | * Read the next child block. | |
1491 | */ | |
1492 | blk->blkno = blkno; | |
1493 | error = xfs_da_read_buf(args->trans, args->dp, blkno, -1, | |
1494 | &blk->bp, args->whichfork); | |
1495 | if (error) | |
1496 | return(error); | |
1497 | ASSERT(blk->bp != NULL); | |
1498 | info = blk->bp->data; | |
1499 | ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC || | |
1500 | INT_GET(info->magic, ARCH_CONVERT) == XFS_DIRX_LEAF_MAGIC(state->mp) || | |
1501 | INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC); | |
1502 | blk->magic = INT_GET(info->magic, ARCH_CONVERT); | |
1503 | if (INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) { | |
1504 | node = (xfs_da_intnode_t *)info; | |
1505 | blk->hashval = INT_GET(node->btree[ INT_GET(node->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT); | |
1506 | if (forward) | |
1507 | blk->index = 0; | |
1508 | else | |
1509 | blk->index = INT_GET(node->hdr.count, ARCH_CONVERT)-1; | |
1510 | blkno = INT_GET(node->btree[ blk->index ].before, ARCH_CONVERT); | |
1511 | } else { | |
1512 | ASSERT(level == path->active-1); | |
1513 | blk->index = 0; | |
1514 | switch(blk->magic) { | |
1515 | #ifdef __KERNEL__ | |
1516 | case XFS_ATTR_LEAF_MAGIC: | |
1517 | blk->hashval = xfs_attr_leaf_lasthash(blk->bp, | |
1518 | NULL); | |
1519 | break; | |
1520 | #endif | |
1521 | case XFS_DIR_LEAF_MAGIC: | |
1522 | ASSERT(XFS_DIR_IS_V1(state->mp)); | |
1523 | blk->hashval = xfs_dir_leaf_lasthash(blk->bp, | |
1524 | NULL); | |
1525 | break; | |
1526 | case XFS_DIR2_LEAFN_MAGIC: | |
1527 | ASSERT(XFS_DIR_IS_V2(state->mp)); | |
1528 | blk->hashval = xfs_dir2_leafn_lasthash(blk->bp, | |
1529 | NULL); | |
1530 | break; | |
1531 | default: | |
1532 | ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC || | |
1533 | blk->magic == | |
1534 | XFS_DIRX_LEAF_MAGIC(state->mp)); | |
1535 | break; | |
1536 | } | |
1537 | } | |
1538 | } | |
1539 | *result = 0; | |
1540 | return(0); | |
1541 | } | |
1542 | ||
1543 | ||
1544 | /*======================================================================== | |
1545 | * Utility routines. | |
1546 | *========================================================================*/ | |
1547 | ||
1548 | /* | |
1549 | * Implement a simple hash on a character string. | |
1550 | * Rotate the hash value by 7 bits, then XOR each character in. | |
1551 | * This is implemented with some source-level loop unrolling. | |
1552 | */ | |
1553 | xfs_dahash_t | |
43a8fc1e | 1554 | xfs_da_hashname(uchar_t *name, int namelen) |
2bd0ea18 NS |
1555 | { |
1556 | xfs_dahash_t hash; | |
1557 | ||
5000d01d | 1558 | #define ROTL(x,y) (((x) << (y)) | ((x) >> (32 - (y)))) |
2bd0ea18 NS |
1559 | #ifdef SLOWVERSION |
1560 | /* | |
1561 | * This is the old one-byte-at-a-time version. | |
1562 | */ | |
1563 | for (hash = 0; namelen > 0; namelen--) { | |
1564 | hash = *name++ ^ ROTL(hash, 7); | |
1565 | } | |
1566 | return(hash); | |
1567 | #else | |
1568 | /* | |
1569 | * Do four characters at a time as long as we can. | |
1570 | */ | |
1571 | for (hash = 0; namelen >= 4; namelen -= 4, name += 4) { | |
1572 | hash = (name[0] << 21) ^ (name[1] << 14) ^ (name[2] << 7) ^ | |
1573 | (name[3] << 0) ^ ROTL(hash, 7 * 4); | |
1574 | } | |
1575 | /* | |
1576 | * Now do the rest of the characters. | |
1577 | */ | |
1578 | switch (namelen) { | |
1579 | case 3: | |
1580 | return (name[0] << 14) ^ (name[1] << 7) ^ (name[2] << 0) ^ | |
1581 | ROTL(hash, 7 * 3); | |
1582 | case 2: | |
1583 | return (name[0] << 7) ^ (name[1] << 0) ^ ROTL(hash, 7 * 2); | |
1584 | case 1: | |
1585 | return (name[0] << 0) ^ ROTL(hash, 7 * 1); | |
1586 | case 0: | |
1587 | return hash; | |
1588 | } | |
1589 | /* NOTREACHED */ | |
1590 | #endif | |
1591 | #undef ROTL | |
1592 | return 0; /* keep gcc happy */ | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * Add a block to the btree ahead of the file. | |
1597 | * Return the new block number to the caller. | |
1598 | */ | |
1599 | int | |
1600 | xfs_da_grow_inode(xfs_da_args_t *args, xfs_dablk_t *new_blkno) | |
1601 | { | |
1602 | xfs_fileoff_t bno, b; | |
1603 | xfs_bmbt_irec_t map; | |
5000d01d | 1604 | xfs_bmbt_irec_t *mapp; |
2bd0ea18 NS |
1605 | xfs_inode_t *dp; |
1606 | int nmap, error, w, count, c, got, i, mapi; | |
1607 | xfs_fsize_t size; | |
1608 | xfs_trans_t *tp; | |
1609 | xfs_mount_t *mp; | |
1610 | ||
1611 | dp = args->dp; | |
1612 | mp = dp->i_mount; | |
1613 | w = args->whichfork; | |
1614 | tp = args->trans; | |
1615 | /* | |
1616 | * For new directories adjust the file offset and block count. | |
1617 | */ | |
1618 | if (w == XFS_DATA_FORK && XFS_DIR_IS_V2(mp)) { | |
1619 | bno = mp->m_dirleafblk; | |
1620 | count = mp->m_dirblkfsbs; | |
1621 | } else { | |
1622 | bno = 0; | |
1623 | count = 1; | |
1624 | } | |
1625 | /* | |
1626 | * Find a spot in the file space to put the new block. | |
1627 | */ | |
0e266570 | 1628 | if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, w))) { |
2bd0ea18 NS |
1629 | return error; |
1630 | } | |
1631 | if (w == XFS_DATA_FORK && XFS_DIR_IS_V2(mp)) | |
1632 | ASSERT(bno >= mp->m_dirleafblk && bno < mp->m_dirfreeblk); | |
1633 | /* | |
1634 | * Try mapping it in one filesystem block. | |
1635 | */ | |
1636 | nmap = 1; | |
1637 | ASSERT(args->firstblock != NULL); | |
0e266570 | 1638 | if ((error = xfs_bmapi(tp, dp, bno, count, |
2bd0ea18 NS |
1639 | XFS_BMAPI_AFLAG(w)|XFS_BMAPI_WRITE|XFS_BMAPI_METADATA| |
1640 | XFS_BMAPI_CONTIG, | |
1641 | args->firstblock, args->total, &map, &nmap, | |
0e266570 | 1642 | args->flist))) { |
2bd0ea18 NS |
1643 | return error; |
1644 | } | |
1645 | ASSERT(nmap <= 1); | |
1646 | if (nmap == 1) { | |
1647 | mapp = ↦ | |
1648 | mapi = 1; | |
1649 | } | |
1650 | /* | |
1651 | * If we didn't get it and the block might work if fragmented, | |
5000d01d | 1652 | * try without the CONTIG flag. Loop until we get it all. |
2bd0ea18 NS |
1653 | */ |
1654 | else if (nmap == 0 && count > 1) { | |
2bd0ea18 NS |
1655 | mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP); |
1656 | for (b = bno, mapi = 0; b < bno + count; ) { | |
1657 | nmap = MIN(XFS_BMAP_MAX_NMAP, count); | |
1658 | c = (int)(bno + count - b); | |
0e266570 | 1659 | if ((error = xfs_bmapi(tp, dp, b, c, |
2bd0ea18 NS |
1660 | XFS_BMAPI_AFLAG(w)|XFS_BMAPI_WRITE| |
1661 | XFS_BMAPI_METADATA, | |
1662 | args->firstblock, args->total, | |
0e266570 | 1663 | &mapp[mapi], &nmap, args->flist))) { |
2bd0ea18 NS |
1664 | kmem_free(mapp, sizeof(*mapp) * count); |
1665 | return error; | |
1666 | } | |
1667 | if (nmap < 1) | |
1668 | break; | |
1669 | mapi += nmap; | |
1670 | b = mapp[mapi - 1].br_startoff + | |
1671 | mapp[mapi - 1].br_blockcount; | |
1672 | } | |
1673 | } else { | |
2bd0ea18 NS |
1674 | mapi = 0; |
1675 | mapp = NULL; | |
1676 | } | |
1677 | /* | |
1678 | * Count the blocks we got, make sure it matches the total. | |
1679 | */ | |
1680 | for (i = 0, got = 0; i < mapi; i++) | |
1681 | got += mapp[i].br_blockcount; | |
1682 | if (got != count || mapp[0].br_startoff != bno || | |
1683 | mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount != | |
1684 | bno + count) { | |
2bd0ea18 NS |
1685 | if (mapp != &map) |
1686 | kmem_free(mapp, sizeof(*mapp) * count); | |
1687 | return XFS_ERROR(ENOSPC); | |
1688 | } | |
1689 | if (mapp != &map) | |
1690 | kmem_free(mapp, sizeof(*mapp) * count); | |
1691 | *new_blkno = (xfs_dablk_t)bno; | |
1692 | /* | |
1693 | * For version 1 directories, adjust the file size if it changed. | |
1694 | */ | |
1695 | if (w == XFS_DATA_FORK && XFS_DIR_IS_V1(mp)) { | |
1696 | ASSERT(mapi == 1); | |
0e266570 | 1697 | if ((error = xfs_bmap_last_offset(tp, dp, &bno, w))) |
2bd0ea18 NS |
1698 | return error; |
1699 | size = XFS_FSB_TO_B(mp, bno); | |
1700 | if (size != dp->i_d.di_size) { | |
1701 | dp->i_d.di_size = size; | |
1702 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
1703 | } | |
1704 | } | |
1705 | return 0; | |
1706 | } | |
1707 | ||
1708 | ||
1709 | /* | |
5000d01d | 1710 | * Ick. We need to always be able to remove a btree block, even |
2bd0ea18 NS |
1711 | * if there's no space reservation because the filesystem is full. |
1712 | * This is called if xfs_bunmapi on a btree block fails due to ENOSPC. | |
1713 | * It swaps the target block with the last block in the file. The | |
1714 | * last block in the file can always be removed since it can't cause | |
1715 | * a bmap btree split to do that. | |
1716 | */ | |
1717 | STATIC int | |
1718 | xfs_da_swap_lastblock(xfs_da_args_t *args, xfs_dablk_t *dead_blknop, | |
1719 | xfs_dabuf_t **dead_bufp) | |
1720 | { | |
1721 | xfs_dablk_t dead_blkno, last_blkno, sib_blkno, par_blkno; | |
1722 | xfs_dabuf_t *dead_buf, *last_buf, *sib_buf, *par_buf; | |
1723 | xfs_fileoff_t lastoff; | |
1724 | xfs_inode_t *ip; | |
1725 | xfs_trans_t *tp; | |
1726 | xfs_mount_t *mp; | |
1727 | int error, w, entno, level, dead_level; | |
1728 | xfs_da_blkinfo_t *dead_info, *sib_info; | |
1729 | xfs_da_intnode_t *par_node, *dead_node; | |
1730 | xfs_dir_leafblock_t *dead_leaf; | |
1731 | xfs_dir2_leaf_t *dead_leaf2; | |
1732 | xfs_dahash_t dead_hash; | |
1733 | ||
1734 | dead_buf = *dead_bufp; | |
1735 | dead_blkno = *dead_blknop; | |
1736 | tp = args->trans; | |
1737 | ip = args->dp; | |
1738 | w = args->whichfork; | |
1739 | ASSERT(w == XFS_DATA_FORK); | |
1740 | mp = ip->i_mount; | |
1741 | if (XFS_DIR_IS_V2(mp)) { | |
1742 | lastoff = mp->m_dirfreeblk; | |
1743 | error = xfs_bmap_last_before(tp, ip, &lastoff, w); | |
1744 | } else | |
1745 | error = xfs_bmap_last_offset(tp, ip, &lastoff, w); | |
1746 | if (error) | |
1747 | return error; | |
1748 | if (lastoff == 0) | |
1749 | return XFS_ERROR(EFSCORRUPTED); | |
1750 | /* | |
1751 | * Read the last block in the btree space. | |
1752 | */ | |
1753 | last_blkno = (xfs_dablk_t)lastoff - mp->m_dirblkfsbs; | |
0e266570 | 1754 | if ((error = xfs_da_read_buf(tp, ip, last_blkno, -1, &last_buf, w))) |
2bd0ea18 NS |
1755 | return error; |
1756 | /* | |
1757 | * Copy the last block into the dead buffer and log it. | |
1758 | */ | |
1759 | bcopy(last_buf->data, dead_buf->data, mp->m_dirblksize); | |
1760 | xfs_da_log_buf(tp, dead_buf, 0, mp->m_dirblksize - 1); | |
1761 | dead_info = dead_buf->data; | |
1762 | /* | |
1763 | * Get values from the moved block. | |
1764 | */ | |
1765 | if (INT_GET(dead_info->magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC) { | |
1766 | ASSERT(XFS_DIR_IS_V1(mp)); | |
1767 | dead_leaf = (xfs_dir_leafblock_t *)dead_info; | |
1768 | dead_level = 0; | |
1769 | dead_hash = | |
1770 | INT_GET(dead_leaf->entries[INT_GET(dead_leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT); | |
1771 | } else if (INT_GET(dead_info->magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC) { | |
1772 | ASSERT(XFS_DIR_IS_V2(mp)); | |
1773 | dead_leaf2 = (xfs_dir2_leaf_t *)dead_info; | |
1774 | dead_level = 0; | |
1775 | dead_hash = INT_GET(dead_leaf2->ents[INT_GET(dead_leaf2->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT); | |
1776 | } else { | |
1777 | ASSERT(INT_GET(dead_info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC); | |
1778 | dead_node = (xfs_da_intnode_t *)dead_info; | |
1779 | dead_level = INT_GET(dead_node->hdr.level, ARCH_CONVERT); | |
1780 | dead_hash = INT_GET(dead_node->btree[INT_GET(dead_node->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT); | |
1781 | } | |
1782 | sib_buf = par_buf = NULL; | |
1783 | /* | |
1784 | * If the moved block has a left sibling, fix up the pointers. | |
1785 | */ | |
0e266570 NS |
1786 | if ((sib_blkno = INT_GET(dead_info->back, ARCH_CONVERT))) { |
1787 | if ((error = xfs_da_read_buf(tp, ip, sib_blkno, -1, &sib_buf, w))) | |
2bd0ea18 NS |
1788 | goto done; |
1789 | sib_info = sib_buf->data; | |
1790 | if (INT_GET(sib_info->forw, ARCH_CONVERT) != last_blkno || | |
1791 | INT_GET(sib_info->magic, ARCH_CONVERT) != INT_GET(dead_info->magic, ARCH_CONVERT)) { | |
1792 | error = XFS_ERROR(EFSCORRUPTED); | |
1793 | goto done; | |
1794 | } | |
1795 | INT_SET(sib_info->forw, ARCH_CONVERT, dead_blkno); | |
1796 | xfs_da_log_buf(tp, sib_buf, | |
1797 | XFS_DA_LOGRANGE(sib_info, &sib_info->forw, | |
1798 | sizeof(sib_info->forw))); | |
1799 | xfs_da_buf_done(sib_buf); | |
1800 | sib_buf = NULL; | |
1801 | } | |
1802 | /* | |
1803 | * If the moved block has a right sibling, fix up the pointers. | |
1804 | */ | |
0e266570 NS |
1805 | if ((sib_blkno = INT_GET(dead_info->forw, ARCH_CONVERT))) { |
1806 | if ((error = xfs_da_read_buf(tp, ip, sib_blkno, -1, &sib_buf, w))) | |
2bd0ea18 NS |
1807 | goto done; |
1808 | sib_info = sib_buf->data; | |
1809 | if ( INT_GET(sib_info->back, ARCH_CONVERT) != last_blkno | |
1810 | || INT_GET(sib_info->magic, ARCH_CONVERT) | |
1811 | != INT_GET(dead_info->magic, ARCH_CONVERT)) { | |
1812 | error = XFS_ERROR(EFSCORRUPTED); | |
1813 | goto done; | |
1814 | } | |
1815 | INT_SET(sib_info->back, ARCH_CONVERT, dead_blkno); | |
1816 | xfs_da_log_buf(tp, sib_buf, | |
1817 | XFS_DA_LOGRANGE(sib_info, &sib_info->back, | |
1818 | sizeof(sib_info->back))); | |
1819 | xfs_da_buf_done(sib_buf); | |
1820 | sib_buf = NULL; | |
1821 | } | |
1822 | par_blkno = XFS_DIR_IS_V1(mp) ? 0 : mp->m_dirleafblk; | |
1823 | level = -1; | |
1824 | /* | |
1825 | * Walk down the tree looking for the parent of the moved block. | |
1826 | */ | |
1827 | for (;;) { | |
0e266570 | 1828 | if ((error = xfs_da_read_buf(tp, ip, par_blkno, -1, &par_buf, w))) |
2bd0ea18 NS |
1829 | goto done; |
1830 | par_node = par_buf->data; | |
1831 | if (INT_GET(par_node->hdr.info.magic, ARCH_CONVERT) != XFS_DA_NODE_MAGIC || | |
1832 | (level >= 0 && level != INT_GET(par_node->hdr.level, ARCH_CONVERT) + 1)) { | |
1833 | error = XFS_ERROR(EFSCORRUPTED); | |
1834 | goto done; | |
1835 | } | |
1836 | level = INT_GET(par_node->hdr.level, ARCH_CONVERT); | |
1837 | for (entno = 0; | |
1838 | entno < INT_GET(par_node->hdr.count, ARCH_CONVERT) && | |
1839 | INT_GET(par_node->btree[entno].hashval, ARCH_CONVERT) < dead_hash; | |
1840 | entno++) | |
1841 | continue; | |
1842 | if (entno == INT_GET(par_node->hdr.count, ARCH_CONVERT)) { | |
1843 | error = XFS_ERROR(EFSCORRUPTED); | |
1844 | goto done; | |
1845 | } | |
1846 | par_blkno = INT_GET(par_node->btree[entno].before, ARCH_CONVERT); | |
1847 | if (level == dead_level + 1) | |
1848 | break; | |
1849 | xfs_da_brelse(tp, par_buf); | |
1850 | par_buf = NULL; | |
1851 | } | |
1852 | /* | |
1853 | * We're in the right parent block. | |
1854 | * Look for the right entry. | |
1855 | */ | |
1856 | for (;;) { | |
1857 | for (; | |
1858 | entno < INT_GET(par_node->hdr.count, ARCH_CONVERT) && | |
1859 | INT_GET(par_node->btree[entno].before, ARCH_CONVERT) != last_blkno; | |
1860 | entno++) | |
1861 | continue; | |
1862 | if (entno < INT_GET(par_node->hdr.count, ARCH_CONVERT)) | |
1863 | break; | |
1864 | par_blkno = INT_GET(par_node->hdr.info.forw, ARCH_CONVERT); | |
1865 | xfs_da_brelse(tp, par_buf); | |
1866 | par_buf = NULL; | |
1867 | if (par_blkno == 0) { | |
1868 | error = XFS_ERROR(EFSCORRUPTED); | |
1869 | goto done; | |
1870 | } | |
0e266570 | 1871 | if ((error = xfs_da_read_buf(tp, ip, par_blkno, -1, &par_buf, w))) |
2bd0ea18 NS |
1872 | goto done; |
1873 | par_node = par_buf->data; | |
1874 | if (INT_GET(par_node->hdr.level, ARCH_CONVERT) != level || | |
1875 | INT_GET(par_node->hdr.info.magic, ARCH_CONVERT) != XFS_DA_NODE_MAGIC) { | |
1876 | error = XFS_ERROR(EFSCORRUPTED); | |
1877 | goto done; | |
1878 | } | |
1879 | entno = 0; | |
1880 | } | |
1881 | /* | |
1882 | * Update the parent entry pointing to the moved block. | |
1883 | */ | |
1884 | INT_SET(par_node->btree[entno].before, ARCH_CONVERT, dead_blkno); | |
1885 | xfs_da_log_buf(tp, par_buf, | |
1886 | XFS_DA_LOGRANGE(par_node, &par_node->btree[entno].before, | |
1887 | sizeof(par_node->btree[entno].before))); | |
1888 | xfs_da_buf_done(par_buf); | |
1889 | xfs_da_buf_done(dead_buf); | |
1890 | *dead_blknop = last_blkno; | |
1891 | *dead_bufp = last_buf; | |
1892 | return 0; | |
1893 | done: | |
1894 | if (par_buf) | |
1895 | xfs_da_brelse(tp, par_buf); | |
1896 | if (sib_buf) | |
1897 | xfs_da_brelse(tp, sib_buf); | |
1898 | xfs_da_brelse(tp, last_buf); | |
1899 | return error; | |
1900 | } | |
1901 | ||
1902 | /* | |
1903 | * Remove a btree block from a directory or attribute. | |
1904 | */ | |
1905 | int | |
1906 | xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno, | |
1907 | xfs_dabuf_t *dead_buf) | |
1908 | { | |
1909 | xfs_inode_t *dp; | |
1910 | int done, error, w, count; | |
1911 | xfs_fileoff_t bno; | |
1912 | xfs_fsize_t size; | |
1913 | xfs_trans_t *tp; | |
1914 | xfs_mount_t *mp; | |
1915 | ||
1916 | dp = args->dp; | |
1917 | w = args->whichfork; | |
1918 | tp = args->trans; | |
1919 | mp = dp->i_mount; | |
1920 | if (w == XFS_DATA_FORK && XFS_DIR_IS_V2(mp)) | |
1921 | count = mp->m_dirblkfsbs; | |
1922 | else | |
1923 | count = 1; | |
1924 | for (;;) { | |
1925 | /* | |
1926 | * Remove extents. If we get ENOSPC for a dir we have to move | |
1927 | * the last block to the place we want to kill. | |
1928 | */ | |
1929 | if ((error = xfs_bunmapi(tp, dp, dead_blkno, count, | |
1930 | XFS_BMAPI_AFLAG(w)|XFS_BMAPI_METADATA, | |
1931 | 0, args->firstblock, args->flist, | |
1932 | &done)) == ENOSPC) { | |
1933 | if (w != XFS_DATA_FORK) | |
1934 | goto done; | |
0e266570 NS |
1935 | if ((error = xfs_da_swap_lastblock(args, &dead_blkno, |
1936 | &dead_buf))) | |
2bd0ea18 NS |
1937 | goto done; |
1938 | } else if (error) | |
1939 | goto done; | |
1940 | else | |
1941 | break; | |
1942 | } | |
1943 | ASSERT(done); | |
1944 | xfs_da_binval(tp, dead_buf); | |
1945 | /* | |
1946 | * Adjust the directory size for version 1. | |
1947 | */ | |
1948 | if (w == XFS_DATA_FORK && XFS_DIR_IS_V1(mp)) { | |
0e266570 | 1949 | if ((error = xfs_bmap_last_offset(tp, dp, &bno, w))) |
2bd0ea18 NS |
1950 | return error; |
1951 | size = XFS_FSB_TO_B(dp->i_mount, bno); | |
1952 | if (size != dp->i_d.di_size) { | |
1953 | dp->i_d.di_size = size; | |
1954 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
1955 | } | |
1956 | } | |
1957 | return 0; | |
1958 | done: | |
1959 | xfs_da_binval(tp, dead_buf); | |
1960 | return error; | |
1961 | } | |
1962 | ||
1963 | /* | |
1964 | * See if the mapping(s) for this btree block are valid, i.e. | |
1965 | * don't contain holes, are logically contiguous, and cover the whole range. | |
1966 | */ | |
1967 | STATIC int | |
1968 | xfs_da_map_covers_blocks( | |
1969 | int nmap, | |
5000d01d | 1970 | xfs_bmbt_irec_t *mapp, |
2bd0ea18 NS |
1971 | xfs_dablk_t bno, |
1972 | int count) | |
1973 | { | |
1974 | int i; | |
1975 | xfs_fileoff_t off; | |
1976 | ||
1977 | for (i = 0, off = bno; i < nmap; i++) { | |
1978 | if (mapp[i].br_startblock == HOLESTARTBLOCK || | |
1979 | mapp[i].br_startblock == DELAYSTARTBLOCK) { | |
2bd0ea18 NS |
1980 | return 0; |
1981 | } | |
1982 | if (off != mapp[i].br_startoff) { | |
2bd0ea18 NS |
1983 | return 0; |
1984 | } | |
1985 | off += mapp[i].br_blockcount; | |
1986 | } | |
1987 | return off == bno + count; | |
1988 | } | |
1989 | ||
1990 | /* | |
1991 | * Make a dabuf. | |
1992 | * Used for get_buf, read_buf, read_bufr, and reada_buf. | |
1993 | */ | |
1994 | STATIC int | |
1995 | xfs_da_do_buf( | |
1996 | xfs_trans_t *trans, | |
1997 | xfs_inode_t *dp, | |
1998 | xfs_dablk_t bno, | |
1999 | xfs_daddr_t *mappedbnop, | |
2000 | xfs_dabuf_t **bpp, | |
2001 | int whichfork, | |
2002 | int caller, | |
2003 | inst_t *ra) | |
2004 | { | |
0e266570 NS |
2005 | xfs_buf_t *bp = 0; |
2006 | xfs_buf_t **bplist; | |
2007 | int error=0; | |
2bd0ea18 | 2008 | int i; |
5000d01d SL |
2009 | xfs_bmbt_irec_t map; |
2010 | xfs_bmbt_irec_t *mapp; | |
2bd0ea18 NS |
2011 | xfs_daddr_t mappedbno; |
2012 | xfs_mount_t *mp; | |
0e266570 | 2013 | int nbplist=0; |
2bd0ea18 NS |
2014 | int nfsb; |
2015 | int nmap; | |
2016 | xfs_dabuf_t *rbp; | |
2017 | ||
2018 | mp = dp->i_mount; | |
2019 | if (whichfork == XFS_DATA_FORK && XFS_DIR_IS_V2(mp)) | |
2020 | nfsb = mp->m_dirblkfsbs; | |
2021 | else | |
2022 | nfsb = 1; | |
2023 | mappedbno = *mappedbnop; | |
2024 | /* | |
2025 | * Caller doesn't have a mapping. -2 means don't complain | |
2026 | * if we land in a hole. | |
2027 | */ | |
2028 | if (mappedbno == -1 || mappedbno == -2) { | |
2029 | /* | |
2030 | * Optimize the one-block case. | |
2031 | */ | |
2032 | if (nfsb == 1) { | |
2033 | xfs_fsblock_t fsb; | |
2034 | ||
0e266570 | 2035 | if ((error = |
2bd0ea18 | 2036 | xfs_bmapi_single(trans, dp, whichfork, &fsb, |
0e266570 | 2037 | (xfs_fileoff_t)bno))) { |
2bd0ea18 NS |
2038 | return error; |
2039 | } | |
2040 | mapp = ↦ | |
2041 | if (fsb == NULLFSBLOCK) { | |
2bd0ea18 NS |
2042 | nmap = 0; |
2043 | } else { | |
2044 | map.br_startblock = fsb; | |
2045 | map.br_startoff = (xfs_fileoff_t)bno; | |
2046 | map.br_blockcount = 1; | |
2047 | nmap = 1; | |
2048 | } | |
2049 | } else { | |
2bd0ea18 NS |
2050 | xfs_fsblock_t firstblock; |
2051 | ||
2052 | firstblock = NULLFSBLOCK; | |
2f8883de | 2053 | mapp = kmem_alloc(sizeof(*mapp) * nfsb, KM_SLEEP); |
2bd0ea18 | 2054 | nmap = nfsb; |
0e266570 | 2055 | if ((error = xfs_bmapi(trans, dp, (xfs_fileoff_t)bno, |
2bd0ea18 NS |
2056 | nfsb, |
2057 | XFS_BMAPI_METADATA | | |
2058 | XFS_BMAPI_AFLAG(whichfork), | |
0e266570 | 2059 | &firstblock, 0, mapp, &nmap, NULL))) |
2bd0ea18 NS |
2060 | goto exit0; |
2061 | } | |
2062 | } else { | |
2063 | map.br_startblock = XFS_DADDR_TO_FSB(mp, mappedbno); | |
2064 | map.br_startoff = (xfs_fileoff_t)bno; | |
2065 | map.br_blockcount = nfsb; | |
2066 | mapp = ↦ | |
2067 | nmap = 1; | |
2068 | } | |
2069 | if (!xfs_da_map_covers_blocks(nmap, mapp, bno, nfsb)) { | |
2bd0ea18 NS |
2070 | error = mappedbno == -2 ? 0 : XFS_ERROR(EFSCORRUPTED); |
2071 | goto exit0; | |
2072 | } | |
2073 | if (caller != 3 && nmap > 1) { | |
2f8883de | 2074 | bplist = kmem_alloc(sizeof(*bplist) * nmap, KM_SLEEP); |
2bd0ea18 NS |
2075 | nbplist = 0; |
2076 | } else | |
2077 | bplist = NULL; | |
2078 | /* | |
2079 | * Turn the mapping(s) into buffer(s). | |
2080 | */ | |
2081 | for (i = 0; i < nmap; i++) { | |
2082 | int nmapped; | |
2083 | ||
2084 | mappedbno = XFS_FSB_TO_DADDR(mp, mapp[i].br_startblock); | |
2085 | if (i == 0) | |
2086 | *mappedbnop = mappedbno; | |
2087 | nmapped = (int)XFS_FSB_TO_BB(mp, mapp[i].br_blockcount); | |
2088 | switch (caller) { | |
2089 | case 0: | |
2090 | bp = xfs_trans_get_buf(trans, mp->m_ddev_targp, | |
2091 | mappedbno, nmapped, 0); | |
2092 | error = bp ? XFS_BUF_GETERROR(bp) : XFS_ERROR(EIO); | |
2093 | break; | |
2094 | case 1: | |
2095 | #ifndef __KERNEL__ | |
2096 | case 2: | |
2097 | #endif | |
2098 | bp = NULL; | |
2099 | error = xfs_trans_read_buf(mp, trans, mp->m_ddev_targp, | |
2100 | mappedbno, nmapped, 0, &bp); | |
2101 | break; | |
2102 | #ifdef __KERNEL__ | |
2103 | case 3: | |
2104 | xfs_baread(mp->m_ddev_targp, mappedbno, nmapped); | |
2105 | error = 0; | |
2106 | bp = NULL; | |
2107 | break; | |
2108 | #endif | |
2109 | } | |
2110 | if (error) { | |
2bd0ea18 NS |
2111 | if (bp) |
2112 | xfs_trans_brelse(trans, bp); | |
2113 | goto exit1; | |
2114 | } | |
2115 | if (!bp) | |
2116 | continue; | |
2117 | if (caller == 1) { | |
2118 | if (whichfork == XFS_ATTR_FORK) { | |
5000d01d | 2119 | XFS_BUF_SET_VTYPE_REF(bp, B_FS_ATTR_BTREE, |
2bd0ea18 NS |
2120 | XFS_ATTR_BTREE_REF); |
2121 | } else { | |
2122 | XFS_BUF_SET_VTYPE_REF(bp, B_FS_DIR_BTREE, | |
2123 | XFS_DIR_BTREE_REF); | |
2124 | } | |
2125 | } | |
2126 | if (bplist) { | |
2bd0ea18 NS |
2127 | bplist[nbplist++] = bp; |
2128 | } | |
2129 | } | |
2130 | /* | |
2131 | * Build a dabuf structure. | |
2132 | */ | |
2133 | if (bplist) { | |
2f8883de | 2134 | rbp = xfs_da_buf_make(nbplist, bplist, ra); |
2bd0ea18 | 2135 | } else if (bp) |
2f8883de | 2136 | rbp = xfs_da_buf_make(1, &bp, ra); |
2bd0ea18 NS |
2137 | else |
2138 | rbp = NULL; | |
2139 | /* | |
2140 | * For read_buf, check the magic number. | |
2141 | */ | |
2142 | if (caller == 1) { | |
2143 | xfs_dir2_data_t *data; | |
2144 | xfs_dir2_free_t *free; | |
2145 | xfs_da_blkinfo_t *info; | |
87718ce2 | 2146 | uint magic, magic1; |
2bd0ea18 NS |
2147 | |
2148 | info = rbp->data; | |
2149 | data = rbp->data; | |
2150 | free = rbp->data; | |
87718ce2 NS |
2151 | magic = INT_GET(info->magic, ARCH_CONVERT); |
2152 | magic1 = INT_GET(data->hdr.magic, ARCH_CONVERT); | |
2153 | if (XFS_TEST_ERROR((magic != XFS_DA_NODE_MAGIC) && | |
2154 | (magic != XFS_DIR_LEAF_MAGIC) && | |
2155 | (magic != XFS_ATTR_LEAF_MAGIC) && | |
2156 | (magic != XFS_DIR2_LEAF1_MAGIC) && | |
2157 | (magic != XFS_DIR2_LEAFN_MAGIC) && | |
2158 | (magic1 != XFS_DIR2_BLOCK_MAGIC) && | |
2159 | (magic1 != XFS_DIR2_DATA_MAGIC) && | |
5ce1d1f7 | 2160 | (INT_GET(free->hdr.magic, ARCH_CONVERT) != XFS_DIR2_FREE_MAGIC), |
2bd0ea18 NS |
2161 | mp, XFS_ERRTAG_DA_READ_BUF, |
2162 | XFS_RANDOM_DA_READ_BUF)) { | |
2bd0ea18 NS |
2163 | xfs_buftrace("DA READ ERROR", rbp->bps[0]); |
2164 | error = XFS_ERROR(EFSCORRUPTED); | |
2165 | xfs_da_brelse(trans, rbp); | |
2166 | nbplist = 0; | |
2167 | goto exit1; | |
2168 | } | |
2169 | } | |
2170 | if (bplist) { | |
2bd0ea18 NS |
2171 | kmem_free(bplist, sizeof(*bplist) * nmap); |
2172 | } | |
2173 | if (mapp != &map) { | |
2bd0ea18 NS |
2174 | kmem_free(mapp, sizeof(*mapp) * nfsb); |
2175 | } | |
2176 | if (bpp) | |
2177 | *bpp = rbp; | |
2178 | return 0; | |
2179 | exit1: | |
2180 | if (bplist) { | |
2181 | for (i = 0; i < nbplist; i++) | |
2182 | xfs_trans_brelse(trans, bplist[i]); | |
2183 | kmem_free(bplist, sizeof(*bplist) * nmap); | |
2184 | } | |
2185 | exit0: | |
2186 | if (mapp != &map) | |
2187 | kmem_free(mapp, sizeof(*mapp) * nfsb); | |
2188 | if (bpp) | |
2189 | *bpp = NULL; | |
2190 | return error; | |
2191 | } | |
2192 | ||
2193 | /* | |
2194 | * Get a buffer for the dir/attr block. | |
2195 | */ | |
2196 | int | |
2197 | xfs_da_get_buf( | |
2198 | xfs_trans_t *trans, | |
2199 | xfs_inode_t *dp, | |
2200 | xfs_dablk_t bno, | |
2201 | xfs_daddr_t mappedbno, | |
2202 | xfs_dabuf_t **bpp, | |
2203 | int whichfork) | |
2204 | { | |
2205 | return xfs_da_do_buf(trans, dp, bno, &mappedbno, bpp, whichfork, 0, | |
2206 | (inst_t *)__return_address); | |
2207 | } | |
2208 | ||
2209 | /* | |
2210 | * Get a buffer for the dir/attr block, fill in the contents. | |
2211 | */ | |
2212 | int | |
2213 | xfs_da_read_buf( | |
2214 | xfs_trans_t *trans, | |
2215 | xfs_inode_t *dp, | |
2216 | xfs_dablk_t bno, | |
2217 | xfs_daddr_t mappedbno, | |
2218 | xfs_dabuf_t **bpp, | |
2219 | int whichfork) | |
2220 | { | |
2221 | return xfs_da_do_buf(trans, dp, bno, &mappedbno, bpp, whichfork, 1, | |
2222 | (inst_t *)__return_address); | |
2223 | } | |
2224 | ||
2225 | /* | |
2226 | * Calculate the number of bits needed to hold i different values. | |
2227 | */ | |
2228 | uint | |
2229 | xfs_da_log2_roundup(uint i) | |
2230 | { | |
2231 | uint rval; | |
2232 | ||
2233 | for (rval = 0; rval < NBBY * sizeof(i); rval++) { | |
2234 | if ((1 << rval) >= i) | |
2235 | break; | |
2236 | } | |
2237 | return(rval); | |
2238 | } | |
2239 | ||
2240 | xfs_zone_t *xfs_da_state_zone; /* anchor for state struct zone */ | |
2241 | xfs_zone_t *xfs_dabuf_zone; /* dabuf zone */ | |
2242 | ||
2243 | /* | |
2244 | * Allocate a dir-state structure. | |
2245 | * We don't put them on the stack since they're large. | |
2246 | */ | |
2247 | xfs_da_state_t * | |
2248 | xfs_da_state_alloc(void) | |
2249 | { | |
2250 | return kmem_zone_zalloc(xfs_da_state_zone, KM_SLEEP); | |
2251 | } | |
2252 | ||
2253 | /* | |
2254 | * Kill the altpath contents of a da-state structure. | |
2255 | */ | |
2256 | void | |
2257 | xfs_da_state_kill_altpath(xfs_da_state_t *state) | |
2258 | { | |
2259 | int i; | |
2260 | ||
2261 | for (i = 0; i < state->altpath.active; i++) { | |
2262 | if (state->altpath.blk[i].bp) { | |
2263 | if (state->altpath.blk[i].bp != state->path.blk[i].bp) | |
2264 | xfs_da_buf_done(state->altpath.blk[i].bp); | |
2265 | state->altpath.blk[i].bp = NULL; | |
2266 | } | |
2267 | } | |
2268 | state->altpath.active = 0; | |
2269 | } | |
2270 | ||
2271 | /* | |
2272 | * Free a da-state structure. | |
2273 | */ | |
2274 | void | |
2275 | xfs_da_state_free(xfs_da_state_t *state) | |
2276 | { | |
2277 | int i; | |
2278 | ||
2279 | xfs_da_state_kill_altpath(state); | |
2280 | for (i = 0; i < state->path.active; i++) { | |
2281 | if (state->path.blk[i].bp) | |
2282 | xfs_da_buf_done(state->path.blk[i].bp); | |
2283 | } | |
2284 | if (state->extravalid && state->extrablk.bp) | |
2285 | xfs_da_buf_done(state->extrablk.bp); | |
2286 | #ifdef DEBUG | |
2287 | bzero((char *)state, sizeof(*state)); | |
2288 | #endif /* DEBUG */ | |
2289 | kmem_zone_free(xfs_da_state_zone, state); | |
2290 | } | |
2291 | ||
2292 | #ifdef XFS_DABUF_DEBUG | |
2293 | xfs_dabuf_t *xfs_dabuf_global_list; | |
2294 | lock_t xfs_dabuf_global_lock; | |
2295 | #endif | |
2296 | ||
2297 | /* | |
2298 | * Create a dabuf. | |
2299 | */ | |
2300 | /* ARGSUSED */ | |
2301 | STATIC xfs_dabuf_t * | |
2f8883de | 2302 | xfs_da_buf_make(int nbuf, xfs_buf_t **bps, inst_t *ra) |
2bd0ea18 | 2303 | { |
9911e5dc | 2304 | xfs_buf_t *bp; |
2bd0ea18 NS |
2305 | xfs_dabuf_t *dabuf; |
2306 | int i; | |
2307 | int off; | |
2308 | ||
2309 | if (nbuf == 1) | |
2f8883de | 2310 | dabuf = kmem_zone_alloc(xfs_dabuf_zone, KM_SLEEP); |
2bd0ea18 | 2311 | else |
2f8883de | 2312 | dabuf = kmem_alloc(XFS_DA_BUF_SIZE(nbuf), KM_SLEEP); |
2bd0ea18 NS |
2313 | dabuf->dirty = 0; |
2314 | #ifdef XFS_DABUF_DEBUG | |
2315 | dabuf->ra = ra; | |
9911e5dc | 2316 | dabuf->dev = XFS_BUF_TARGET_DEV(bps[0]); |
2bd0ea18 NS |
2317 | dabuf->blkno = XFS_BUF_ADDR(bps[0]); |
2318 | #endif | |
2319 | if (nbuf == 1) { | |
2320 | dabuf->nbuf = 1; | |
2321 | bp = bps[0]; | |
2322 | dabuf->bbcount = (short)BTOBB(XFS_BUF_COUNT(bp)); | |
2323 | dabuf->data = XFS_BUF_PTR(bp); | |
2324 | dabuf->bps[0] = bp; | |
2325 | } else { | |
2326 | dabuf->nbuf = nbuf; | |
2327 | for (i = 0, dabuf->bbcount = 0; i < nbuf; i++) { | |
2328 | dabuf->bps[i] = bp = bps[i]; | |
2329 | dabuf->bbcount += BTOBB(XFS_BUF_COUNT(bp)); | |
2330 | } | |
2331 | dabuf->data = kmem_alloc(BBTOB(dabuf->bbcount), KM_SLEEP); | |
2332 | for (i = off = 0; i < nbuf; i++, off += XFS_BUF_COUNT(bp)) { | |
2333 | bp = bps[i]; | |
2334 | bcopy(XFS_BUF_PTR(bp), (char *)dabuf->data + off, | |
2335 | XFS_BUF_COUNT(bp)); | |
2336 | } | |
2337 | } | |
2338 | #ifdef XFS_DABUF_DEBUG | |
2339 | { | |
1f5ff52f | 2340 | SPLDECL(s); |
2bd0ea18 NS |
2341 | xfs_dabuf_t *p; |
2342 | ||
2343 | s = mutex_spinlock(&xfs_dabuf_global_lock); | |
2344 | for (p = xfs_dabuf_global_list; p; p = p->next) { | |
2345 | ASSERT(p->blkno != dabuf->blkno || | |
2346 | p->dev != dabuf->dev); | |
2347 | } | |
2348 | dabuf->prev = NULL; | |
2349 | if (xfs_dabuf_global_list) | |
2350 | xfs_dabuf_global_list->prev = dabuf; | |
2351 | dabuf->next = xfs_dabuf_global_list; | |
2352 | xfs_dabuf_global_list = dabuf; | |
2353 | mutex_spinunlock(&xfs_dabuf_global_lock, s); | |
2354 | } | |
2355 | #endif | |
2356 | return dabuf; | |
2357 | } | |
2358 | ||
2359 | /* | |
2360 | * Un-dirty a dabuf. | |
2361 | */ | |
2362 | STATIC void | |
2363 | xfs_da_buf_clean(xfs_dabuf_t *dabuf) | |
2364 | { | |
2365 | xfs_buf_t *bp; | |
9911e5dc ES |
2366 | int i; |
2367 | int off; | |
2bd0ea18 NS |
2368 | |
2369 | if (dabuf->dirty) { | |
2370 | ASSERT(dabuf->nbuf > 1); | |
2371 | dabuf->dirty = 0; | |
2372 | for (i = off = 0; i < dabuf->nbuf; | |
2373 | i++, off += XFS_BUF_COUNT(bp)) { | |
2374 | bp = dabuf->bps[i]; | |
2375 | bcopy((char *)dabuf->data + off, XFS_BUF_PTR(bp), | |
2376 | XFS_BUF_COUNT(bp)); | |
2377 | } | |
2378 | } | |
2379 | } | |
2380 | ||
2381 | /* | |
2382 | * Release a dabuf. | |
2383 | */ | |
2384 | void | |
2385 | xfs_da_buf_done(xfs_dabuf_t *dabuf) | |
2386 | { | |
5000d01d | 2387 | ASSERT(dabuf); |
2bd0ea18 NS |
2388 | ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]); |
2389 | if (dabuf->dirty) | |
2390 | xfs_da_buf_clean(dabuf); | |
2391 | if (dabuf->nbuf > 1) | |
2392 | kmem_free(dabuf->data, BBTOB(dabuf->bbcount)); | |
2393 | #ifdef XFS_DABUF_DEBUG | |
2394 | { | |
1f5ff52f | 2395 | SPLDECL(s); |
2bd0ea18 NS |
2396 | |
2397 | s = mutex_spinlock(&xfs_dabuf_global_lock); | |
2398 | if (dabuf->prev) | |
2399 | dabuf->prev->next = dabuf->next; | |
2400 | else | |
2401 | xfs_dabuf_global_list = dabuf->next; | |
2402 | if (dabuf->next) | |
2403 | dabuf->next->prev = dabuf->prev; | |
2404 | mutex_spinunlock(&xfs_dabuf_global_lock, s); | |
2405 | } | |
2406 | bzero(dabuf, XFS_DA_BUF_SIZE(dabuf->nbuf)); | |
2407 | #endif | |
2408 | if (dabuf->nbuf == 1) | |
2409 | kmem_zone_free(xfs_dabuf_zone, dabuf); | |
2410 | else | |
2411 | kmem_free(dabuf, XFS_DA_BUF_SIZE(dabuf->nbuf)); | |
2412 | } | |
2413 | ||
2414 | /* | |
2415 | * Log transaction from a dabuf. | |
2416 | */ | |
2417 | void | |
2418 | xfs_da_log_buf(xfs_trans_t *tp, xfs_dabuf_t *dabuf, uint first, uint last) | |
2419 | { | |
2420 | xfs_buf_t *bp; | |
9911e5dc ES |
2421 | uint f; |
2422 | int i; | |
2423 | uint l; | |
2424 | int off; | |
2bd0ea18 NS |
2425 | |
2426 | ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]); | |
2427 | if (dabuf->nbuf == 1) { | |
2428 | ASSERT(dabuf->data == (void *)XFS_BUF_PTR(dabuf->bps[0])); | |
2429 | xfs_trans_log_buf(tp, dabuf->bps[0], first, last); | |
2430 | return; | |
2431 | } | |
2432 | dabuf->dirty = 1; | |
2433 | ASSERT(first <= last); | |
2434 | for (i = off = 0; i < dabuf->nbuf; i++, off += XFS_BUF_COUNT(bp)) { | |
2435 | bp = dabuf->bps[i]; | |
2436 | f = off; | |
2437 | l = f + XFS_BUF_COUNT(bp) - 1; | |
2438 | if (f < first) | |
2439 | f = first; | |
2440 | if (l > last) | |
2441 | l = last; | |
2442 | if (f <= l) | |
2443 | xfs_trans_log_buf(tp, bp, f - off, l - off); | |
5000d01d | 2444 | /* |
2bd0ea18 NS |
2445 | * B_DONE is set by xfs_trans_log buf. |
2446 | * If we don't set it on a new buffer (get not read) | |
2447 | * then if we don't put anything in the buffer it won't | |
2448 | * be set, and at commit it it released into the cache, | |
2449 | * and then a read will fail. | |
2450 | */ | |
2451 | else if (!(XFS_BUF_ISDONE(bp))) | |
2452 | XFS_BUF_DONE(bp); | |
2453 | } | |
2454 | ASSERT(last < off); | |
2455 | } | |
2456 | ||
2457 | /* | |
2458 | * Release dabuf from a transaction. | |
2459 | * Have to free up the dabuf before the buffers are released, | |
2460 | * since the synchronization on the dabuf is really the lock on the buffer. | |
2461 | */ | |
2462 | void | |
2463 | xfs_da_brelse(xfs_trans_t *tp, xfs_dabuf_t *dabuf) | |
2464 | { | |
2465 | xfs_buf_t *bp; | |
2466 | xfs_buf_t **bplist; | |
9911e5dc ES |
2467 | int i; |
2468 | int nbuf; | |
2bd0ea18 NS |
2469 | |
2470 | ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]); | |
2471 | if ((nbuf = dabuf->nbuf) == 1) { | |
2472 | bplist = &bp; | |
2473 | bp = dabuf->bps[0]; | |
2474 | } else { | |
2475 | bplist = kmem_alloc(nbuf * sizeof(*bplist), KM_SLEEP); | |
2476 | bcopy(dabuf->bps, bplist, nbuf * sizeof(*bplist)); | |
2477 | } | |
2478 | xfs_da_buf_done(dabuf); | |
2479 | for (i = 0; i < nbuf; i++) | |
2480 | xfs_trans_brelse(tp, bplist[i]); | |
2481 | if (bplist != &bp) | |
2482 | kmem_free(bplist, nbuf * sizeof(*bplist)); | |
2483 | } | |
2484 | ||
2485 | /* | |
2486 | * Invalidate dabuf from a transaction. | |
2487 | */ | |
2488 | void | |
2489 | xfs_da_binval(xfs_trans_t *tp, xfs_dabuf_t *dabuf) | |
2490 | { | |
2491 | xfs_buf_t *bp; | |
2492 | xfs_buf_t **bplist; | |
9911e5dc ES |
2493 | int i; |
2494 | int nbuf; | |
2bd0ea18 NS |
2495 | |
2496 | ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]); | |
2497 | if ((nbuf = dabuf->nbuf) == 1) { | |
2498 | bplist = &bp; | |
2499 | bp = dabuf->bps[0]; | |
2500 | } else { | |
2501 | bplist = kmem_alloc(nbuf * sizeof(*bplist), KM_SLEEP); | |
2502 | bcopy(dabuf->bps, bplist, nbuf * sizeof(*bplist)); | |
2503 | } | |
2504 | xfs_da_buf_done(dabuf); | |
2505 | for (i = 0; i < nbuf; i++) | |
2506 | xfs_trans_binval(tp, bplist[i]); | |
2507 | if (bplist != &bp) | |
2508 | kmem_free(bplist, nbuf * sizeof(*bplist)); | |
2509 | } |