]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) International Business Machines Corp., 2000-2004 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
19 | /* | |
20 | * jfs_dtree.c: directory B+-tree manager | |
21 | * | |
22 | * B+-tree with variable length key directory: | |
23 | * | |
24 | * each directory page is structured as an array of 32-byte | |
25 | * directory entry slots initialized as a freelist | |
26 | * to avoid search/compaction of free space at insertion. | |
27 | * when an entry is inserted, a number of slots are allocated | |
28 | * from the freelist as required to store variable length data | |
29 | * of the entry; when the entry is deleted, slots of the entry | |
30 | * are returned to freelist. | |
31 | * | |
32 | * leaf entry stores full name as key and file serial number | |
33 | * (aka inode number) as data. | |
34 | * internal/router entry stores sufffix compressed name | |
35 | * as key and simple extent descriptor as data. | |
36 | * | |
37 | * each directory page maintains a sorted entry index table | |
38 | * which stores the start slot index of sorted entries | |
39 | * to allow binary search on the table. | |
40 | * | |
41 | * directory starts as a root/leaf page in on-disk inode | |
42 | * inline data area. | |
43 | * when it becomes full, it starts a leaf of a external extent | |
44 | * of length of 1 block. each time the first leaf becomes full, | |
45 | * it is extended rather than split (its size is doubled), | |
46 | * until its length becoms 4 KBytes, from then the extent is split | |
47 | * with new 4 Kbyte extent when it becomes full | |
48 | * to reduce external fragmentation of small directories. | |
49 | * | |
50 | * blah, blah, blah, for linear scan of directory in pieces by | |
51 | * readdir(). | |
52 | * | |
53 | * | |
54 | * case-insensitive directory file system | |
55 | * | |
56 | * names are stored in case-sensitive way in leaf entry. | |
57 | * but stored, searched and compared in case-insensitive (uppercase) order | |
58 | * (i.e., both search key and entry key are folded for search/compare): | |
59 | * (note that case-sensitive order is BROKEN in storage, e.g., | |
60 | * sensitive: Ad, aB, aC, aD -> insensitive: aB, aC, aD, Ad | |
61 | * | |
62 | * entries which folds to the same key makes up a equivalent class | |
63 | * whose members are stored as contiguous cluster (may cross page boundary) | |
64 | * but whose order is arbitrary and acts as duplicate, e.g., | |
65 | * abc, Abc, aBc, abC) | |
66 | * | |
67 | * once match is found at leaf, requires scan forward/backward | |
68 | * either for, in case-insensitive search, duplicate | |
69 | * or for, in case-sensitive search, for exact match | |
70 | * | |
71 | * router entry must be created/stored in case-insensitive way | |
72 | * in internal entry: | |
73 | * (right most key of left page and left most key of right page | |
74 | * are folded, and its suffix compression is propagated as router | |
75 | * key in parent) | |
76 | * (e.g., if split occurs <abc> and <aBd>, <ABD> trather than <aB> | |
77 | * should be made the router key for the split) | |
78 | * | |
79 | * case-insensitive search: | |
80 | * | |
81 | * fold search key; | |
82 | * | |
83 | * case-insensitive search of B-tree: | |
84 | * for internal entry, router key is already folded; | |
85 | * for leaf entry, fold the entry key before comparison. | |
86 | * | |
87 | * if (leaf entry case-insensitive match found) | |
88 | * if (next entry satisfies case-insensitive match) | |
89 | * return EDUPLICATE; | |
90 | * if (prev entry satisfies case-insensitive match) | |
91 | * return EDUPLICATE; | |
92 | * return match; | |
93 | * else | |
94 | * return no match; | |
95 | * | |
96 | * serialization: | |
97 | * target directory inode lock is being held on entry/exit | |
98 | * of all main directory service routines. | |
99 | * | |
100 | * log based recovery: | |
101 | */ | |
102 | ||
103 | #include <linux/fs.h> | |
104 | #include <linux/quotaops.h> | |
105 | #include "jfs_incore.h" | |
106 | #include "jfs_superblock.h" | |
107 | #include "jfs_filsys.h" | |
108 | #include "jfs_metapage.h" | |
109 | #include "jfs_dmap.h" | |
110 | #include "jfs_unicode.h" | |
111 | #include "jfs_debug.h" | |
112 | ||
113 | /* dtree split parameter */ | |
114 | struct dtsplit { | |
115 | struct metapage *mp; | |
116 | s16 index; | |
117 | s16 nslot; | |
118 | struct component_name *key; | |
119 | ddata_t *data; | |
120 | struct pxdlist *pxdlist; | |
121 | }; | |
122 | ||
123 | #define DT_PAGE(IP, MP) BT_PAGE(IP, MP, dtpage_t, i_dtroot) | |
124 | ||
125 | /* get page buffer for specified block address */ | |
126 | #define DT_GETPAGE(IP, BN, MP, SIZE, P, RC)\ | |
127 | {\ | |
128 | BT_GETPAGE(IP, BN, MP, dtpage_t, SIZE, P, RC, i_dtroot)\ | |
129 | if (!(RC))\ | |
130 | {\ | |
131 | if (((P)->header.nextindex > (((BN)==0)?DTROOTMAXSLOT:(P)->header.maxslot)) ||\ | |
132 | ((BN) && ((P)->header.maxslot > DTPAGEMAXSLOT)))\ | |
133 | {\ | |
134 | BT_PUTPAGE(MP);\ | |
135 | jfs_error((IP)->i_sb, "DT_GETPAGE: dtree page corrupt");\ | |
136 | MP = NULL;\ | |
137 | RC = -EIO;\ | |
138 | }\ | |
139 | }\ | |
140 | } | |
141 | ||
142 | /* for consistency */ | |
143 | #define DT_PUTPAGE(MP) BT_PUTPAGE(MP) | |
144 | ||
145 | #define DT_GETSEARCH(IP, LEAF, BN, MP, P, INDEX) \ | |
146 | BT_GETSEARCH(IP, LEAF, BN, MP, dtpage_t, P, INDEX, i_dtroot) | |
147 | ||
148 | /* | |
149 | * forward references | |
150 | */ | |
151 | static int dtSplitUp(tid_t tid, struct inode *ip, | |
152 | struct dtsplit * split, struct btstack * btstack); | |
153 | ||
154 | static int dtSplitPage(tid_t tid, struct inode *ip, struct dtsplit * split, | |
155 | struct metapage ** rmpp, dtpage_t ** rpp, pxd_t * rxdp); | |
156 | ||
157 | static int dtExtendPage(tid_t tid, struct inode *ip, | |
158 | struct dtsplit * split, struct btstack * btstack); | |
159 | ||
160 | static int dtSplitRoot(tid_t tid, struct inode *ip, | |
161 | struct dtsplit * split, struct metapage ** rmpp); | |
162 | ||
163 | static int dtDeleteUp(tid_t tid, struct inode *ip, struct metapage * fmp, | |
164 | dtpage_t * fp, struct btstack * btstack); | |
165 | ||
166 | static int dtRelink(tid_t tid, struct inode *ip, dtpage_t * p); | |
167 | ||
168 | static int dtReadFirst(struct inode *ip, struct btstack * btstack); | |
169 | ||
170 | static int dtReadNext(struct inode *ip, | |
171 | loff_t * offset, struct btstack * btstack); | |
172 | ||
173 | static int dtCompare(struct component_name * key, dtpage_t * p, int si); | |
174 | ||
175 | static int ciCompare(struct component_name * key, dtpage_t * p, int si, | |
176 | int flag); | |
177 | ||
178 | static void dtGetKey(dtpage_t * p, int i, struct component_name * key, | |
179 | int flag); | |
180 | ||
181 | static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp, | |
182 | int ri, struct component_name * key, int flag); | |
183 | ||
184 | static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key, | |
185 | ddata_t * data, struct dt_lock **); | |
186 | ||
187 | static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp, | |
188 | struct dt_lock ** sdtlock, struct dt_lock ** ddtlock, | |
189 | int do_index); | |
190 | ||
191 | static void dtDeleteEntry(dtpage_t * p, int fi, struct dt_lock ** dtlock); | |
192 | ||
193 | static void dtTruncateEntry(dtpage_t * p, int ti, struct dt_lock ** dtlock); | |
194 | ||
195 | static void dtLinelockFreelist(dtpage_t * p, int m, struct dt_lock ** dtlock); | |
196 | ||
197 | #define ciToUpper(c) UniStrupr((c)->name) | |
198 | ||
199 | /* | |
200 | * read_index_page() | |
201 | * | |
202 | * Reads a page of a directory's index table. | |
203 | * Having metadata mapped into the directory inode's address space | |
204 | * presents a multitude of problems. We avoid this by mapping to | |
205 | * the absolute address space outside of the *_metapage routines | |
206 | */ | |
207 | static struct metapage *read_index_page(struct inode *inode, s64 blkno) | |
208 | { | |
209 | int rc; | |
210 | s64 xaddr; | |
211 | int xflag; | |
212 | s32 xlen; | |
213 | ||
214 | rc = xtLookup(inode, blkno, 1, &xflag, &xaddr, &xlen, 1); | |
215 | if (rc || (xlen == 0)) | |
216 | return NULL; | |
217 | ||
218 | return read_metapage(inode, xaddr, PSIZE, 1); | |
219 | } | |
220 | ||
221 | /* | |
222 | * get_index_page() | |
223 | * | |
224 | * Same as get_index_page(), but get's a new page without reading | |
225 | */ | |
226 | static struct metapage *get_index_page(struct inode *inode, s64 blkno) | |
227 | { | |
228 | int rc; | |
229 | s64 xaddr; | |
230 | int xflag; | |
231 | s32 xlen; | |
232 | ||
233 | rc = xtLookup(inode, blkno, 1, &xflag, &xaddr, &xlen, 1); | |
234 | if (rc || (xlen == 0)) | |
235 | return NULL; | |
236 | ||
237 | return get_metapage(inode, xaddr, PSIZE, 1); | |
238 | } | |
239 | ||
240 | /* | |
241 | * find_index() | |
242 | * | |
243 | * Returns dtree page containing directory table entry for specified | |
244 | * index and pointer to its entry. | |
245 | * | |
246 | * mp must be released by caller. | |
247 | */ | |
248 | static struct dir_table_slot *find_index(struct inode *ip, u32 index, | |
249 | struct metapage ** mp, s64 *lblock) | |
250 | { | |
251 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); | |
252 | s64 blkno; | |
253 | s64 offset; | |
254 | int page_offset; | |
255 | struct dir_table_slot *slot; | |
256 | static int maxWarnings = 10; | |
257 | ||
258 | if (index < 2) { | |
259 | if (maxWarnings) { | |
260 | jfs_warn("find_entry called with index = %d", index); | |
261 | maxWarnings--; | |
262 | } | |
263 | return NULL; | |
264 | } | |
265 | ||
266 | if (index >= jfs_ip->next_index) { | |
267 | jfs_warn("find_entry called with index >= next_index"); | |
268 | return NULL; | |
269 | } | |
270 | ||
271 | if (jfs_dirtable_inline(ip)) { | |
272 | /* | |
273 | * Inline directory table | |
274 | */ | |
275 | *mp = NULL; | |
276 | slot = &jfs_ip->i_dirtable[index - 2]; | |
277 | } else { | |
278 | offset = (index - 2) * sizeof(struct dir_table_slot); | |
279 | page_offset = offset & (PSIZE - 1); | |
280 | blkno = ((offset + 1) >> L2PSIZE) << | |
281 | JFS_SBI(ip->i_sb)->l2nbperpage; | |
282 | ||
283 | if (*mp && (*lblock != blkno)) { | |
284 | release_metapage(*mp); | |
285 | *mp = NULL; | |
286 | } | |
287 | if (*mp == 0) { | |
288 | *lblock = blkno; | |
289 | *mp = read_index_page(ip, blkno); | |
290 | } | |
291 | if (*mp == 0) { | |
292 | jfs_err("free_index: error reading directory table"); | |
293 | return NULL; | |
294 | } | |
295 | ||
296 | slot = | |
297 | (struct dir_table_slot *) ((char *) (*mp)->data + | |
298 | page_offset); | |
299 | } | |
300 | return slot; | |
301 | } | |
302 | ||
303 | static inline void lock_index(tid_t tid, struct inode *ip, struct metapage * mp, | |
304 | u32 index) | |
305 | { | |
306 | struct tlock *tlck; | |
307 | struct linelock *llck; | |
308 | struct lv *lv; | |
309 | ||
310 | tlck = txLock(tid, ip, mp, tlckDATA); | |
311 | llck = (struct linelock *) tlck->lock; | |
312 | ||
313 | if (llck->index >= llck->maxcnt) | |
314 | llck = txLinelock(llck); | |
315 | lv = &llck->lv[llck->index]; | |
316 | ||
317 | /* | |
318 | * Linelock slot size is twice the size of directory table | |
319 | * slot size. 512 entries per page. | |
320 | */ | |
321 | lv->offset = ((index - 2) & 511) >> 1; | |
322 | lv->length = 1; | |
323 | llck->index++; | |
324 | } | |
325 | ||
326 | /* | |
327 | * add_index() | |
328 | * | |
329 | * Adds an entry to the directory index table. This is used to provide | |
330 | * each directory entry with a persistent index in which to resume | |
331 | * directory traversals | |
332 | */ | |
333 | static u32 add_index(tid_t tid, struct inode *ip, s64 bn, int slot) | |
334 | { | |
335 | struct super_block *sb = ip->i_sb; | |
336 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
337 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); | |
338 | u64 blkno; | |
339 | struct dir_table_slot *dirtab_slot; | |
340 | u32 index; | |
341 | struct linelock *llck; | |
342 | struct lv *lv; | |
343 | struct metapage *mp; | |
344 | s64 offset; | |
345 | uint page_offset; | |
346 | struct tlock *tlck; | |
347 | s64 xaddr; | |
348 | ||
349 | ASSERT(DO_INDEX(ip)); | |
350 | ||
351 | if (jfs_ip->next_index < 2) { | |
352 | jfs_warn("add_index: next_index = %d. Resetting!", | |
353 | jfs_ip->next_index); | |
354 | jfs_ip->next_index = 2; | |
355 | } | |
356 | ||
357 | index = jfs_ip->next_index++; | |
358 | ||
359 | if (index <= MAX_INLINE_DIRTABLE_ENTRY) { | |
360 | /* | |
361 | * i_size reflects size of index table, or 8 bytes per entry. | |
362 | */ | |
363 | ip->i_size = (loff_t) (index - 1) << 3; | |
364 | ||
365 | /* | |
366 | * dir table fits inline within inode | |
367 | */ | |
368 | dirtab_slot = &jfs_ip->i_dirtable[index-2]; | |
369 | dirtab_slot->flag = DIR_INDEX_VALID; | |
370 | dirtab_slot->slot = slot; | |
371 | DTSaddress(dirtab_slot, bn); | |
372 | ||
373 | set_cflag(COMMIT_Dirtable, ip); | |
374 | ||
375 | return index; | |
376 | } | |
377 | if (index == (MAX_INLINE_DIRTABLE_ENTRY + 1)) { | |
378 | struct dir_table_slot temp_table[12]; | |
379 | ||
380 | /* | |
381 | * It's time to move the inline table to an external | |
382 | * page and begin to build the xtree | |
383 | */ | |
384 | if (DQUOT_ALLOC_BLOCK(ip, sbi->nbperpage) || | |
385 | dbAlloc(ip, 0, sbi->nbperpage, &xaddr)) | |
386 | goto clean_up; /* No space */ | |
387 | ||
388 | /* | |
389 | * Save the table, we're going to overwrite it with the | |
390 | * xtree root | |
391 | */ | |
392 | memcpy(temp_table, &jfs_ip->i_dirtable, sizeof(temp_table)); | |
393 | ||
394 | /* | |
395 | * Initialize empty x-tree | |
396 | */ | |
397 | xtInitRoot(tid, ip); | |
398 | ||
399 | /* | |
400 | * Allocate the first block & add it to the xtree | |
401 | */ | |
402 | if (xtInsert(tid, ip, 0, 0, sbi->nbperpage, &xaddr, 0)) { | |
403 | /* This really shouldn't fail */ | |
404 | jfs_warn("add_index: xtInsert failed!"); | |
405 | memcpy(&jfs_ip->i_dirtable, temp_table, | |
406 | sizeof (temp_table)); | |
407 | goto clean_up; | |
408 | } | |
409 | ip->i_size = PSIZE; | |
410 | ||
411 | if ((mp = get_index_page(ip, 0)) == 0) { | |
412 | jfs_err("add_index: get_metapage failed!"); | |
413 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
414 | memcpy(&jfs_ip->i_dirtable, temp_table, | |
415 | sizeof (temp_table)); | |
416 | goto clean_up; | |
417 | } | |
418 | tlck = txLock(tid, ip, mp, tlckDATA); | |
419 | llck = (struct linelock *) & tlck->lock; | |
420 | ASSERT(llck->index == 0); | |
421 | lv = &llck->lv[0]; | |
422 | ||
423 | lv->offset = 0; | |
424 | lv->length = 6; /* tlckDATA slot size is 16 bytes */ | |
425 | llck->index++; | |
426 | ||
427 | memcpy(mp->data, temp_table, sizeof(temp_table)); | |
428 | ||
429 | mark_metapage_dirty(mp); | |
430 | release_metapage(mp); | |
431 | ||
432 | /* | |
433 | * Logging is now directed by xtree tlocks | |
434 | */ | |
435 | clear_cflag(COMMIT_Dirtable, ip); | |
436 | } | |
437 | ||
438 | offset = (index - 2) * sizeof(struct dir_table_slot); | |
439 | page_offset = offset & (PSIZE - 1); | |
440 | blkno = ((offset + 1) >> L2PSIZE) << sbi->l2nbperpage; | |
441 | if (page_offset == 0) { | |
442 | /* | |
443 | * This will be the beginning of a new page | |
444 | */ | |
445 | xaddr = 0; | |
446 | if (xtInsert(tid, ip, 0, blkno, sbi->nbperpage, &xaddr, 0)) { | |
447 | jfs_warn("add_index: xtInsert failed!"); | |
448 | goto clean_up; | |
449 | } | |
450 | ip->i_size += PSIZE; | |
451 | ||
452 | if ((mp = get_index_page(ip, blkno))) | |
453 | memset(mp->data, 0, PSIZE); /* Just looks better */ | |
454 | else | |
455 | xtTruncate(tid, ip, offset, COMMIT_PWMAP); | |
456 | } else | |
457 | mp = read_index_page(ip, blkno); | |
458 | ||
459 | if (mp == 0) { | |
460 | jfs_err("add_index: get/read_metapage failed!"); | |
461 | goto clean_up; | |
462 | } | |
463 | ||
464 | lock_index(tid, ip, mp, index); | |
465 | ||
466 | dirtab_slot = | |
467 | (struct dir_table_slot *) ((char *) mp->data + page_offset); | |
468 | dirtab_slot->flag = DIR_INDEX_VALID; | |
469 | dirtab_slot->slot = slot; | |
470 | DTSaddress(dirtab_slot, bn); | |
471 | ||
472 | mark_metapage_dirty(mp); | |
473 | release_metapage(mp); | |
474 | ||
475 | return index; | |
476 | ||
477 | clean_up: | |
478 | ||
479 | jfs_ip->next_index--; | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | /* | |
485 | * free_index() | |
486 | * | |
487 | * Marks an entry to the directory index table as free. | |
488 | */ | |
489 | static void free_index(tid_t tid, struct inode *ip, u32 index, u32 next) | |
490 | { | |
491 | struct dir_table_slot *dirtab_slot; | |
492 | s64 lblock; | |
493 | struct metapage *mp = NULL; | |
494 | ||
495 | dirtab_slot = find_index(ip, index, &mp, &lblock); | |
496 | ||
497 | if (dirtab_slot == 0) | |
498 | return; | |
499 | ||
500 | dirtab_slot->flag = DIR_INDEX_FREE; | |
501 | dirtab_slot->slot = dirtab_slot->addr1 = 0; | |
502 | dirtab_slot->addr2 = cpu_to_le32(next); | |
503 | ||
504 | if (mp) { | |
505 | lock_index(tid, ip, mp, index); | |
506 | mark_metapage_dirty(mp); | |
507 | release_metapage(mp); | |
508 | } else | |
509 | set_cflag(COMMIT_Dirtable, ip); | |
510 | } | |
511 | ||
512 | /* | |
513 | * modify_index() | |
514 | * | |
515 | * Changes an entry in the directory index table | |
516 | */ | |
517 | static void modify_index(tid_t tid, struct inode *ip, u32 index, s64 bn, | |
518 | int slot, struct metapage ** mp, u64 *lblock) | |
519 | { | |
520 | struct dir_table_slot *dirtab_slot; | |
521 | ||
522 | dirtab_slot = find_index(ip, index, mp, lblock); | |
523 | ||
524 | if (dirtab_slot == 0) | |
525 | return; | |
526 | ||
527 | DTSaddress(dirtab_slot, bn); | |
528 | dirtab_slot->slot = slot; | |
529 | ||
530 | if (*mp) { | |
531 | lock_index(tid, ip, *mp, index); | |
532 | mark_metapage_dirty(*mp); | |
533 | } else | |
534 | set_cflag(COMMIT_Dirtable, ip); | |
535 | } | |
536 | ||
537 | /* | |
538 | * read_index() | |
539 | * | |
540 | * reads a directory table slot | |
541 | */ | |
542 | static int read_index(struct inode *ip, u32 index, | |
543 | struct dir_table_slot * dirtab_slot) | |
544 | { | |
545 | s64 lblock; | |
546 | struct metapage *mp = NULL; | |
547 | struct dir_table_slot *slot; | |
548 | ||
549 | slot = find_index(ip, index, &mp, &lblock); | |
550 | if (slot == 0) { | |
551 | return -EIO; | |
552 | } | |
553 | ||
554 | memcpy(dirtab_slot, slot, sizeof(struct dir_table_slot)); | |
555 | ||
556 | if (mp) | |
557 | release_metapage(mp); | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | /* | |
563 | * dtSearch() | |
564 | * | |
565 | * function: | |
566 | * Search for the entry with specified key | |
567 | * | |
568 | * parameter: | |
569 | * | |
570 | * return: 0 - search result on stack, leaf page pinned; | |
571 | * errno - I/O error | |
572 | */ | |
573 | int dtSearch(struct inode *ip, struct component_name * key, ino_t * data, | |
574 | struct btstack * btstack, int flag) | |
575 | { | |
576 | int rc = 0; | |
577 | int cmp = 1; /* init for empty page */ | |
578 | s64 bn; | |
579 | struct metapage *mp; | |
580 | dtpage_t *p; | |
581 | s8 *stbl; | |
582 | int base, index, lim; | |
583 | struct btframe *btsp; | |
584 | pxd_t *pxd; | |
585 | int psize = 288; /* initial in-line directory */ | |
586 | ino_t inumber; | |
587 | struct component_name ciKey; | |
588 | struct super_block *sb = ip->i_sb; | |
589 | ||
590 | ciKey.name = | |
591 | (wchar_t *) kmalloc((JFS_NAME_MAX + 1) * sizeof(wchar_t), | |
592 | GFP_NOFS); | |
593 | if (ciKey.name == 0) { | |
594 | rc = -ENOMEM; | |
595 | goto dtSearch_Exit2; | |
596 | } | |
597 | ||
598 | ||
599 | /* uppercase search key for c-i directory */ | |
600 | UniStrcpy(ciKey.name, key->name); | |
601 | ciKey.namlen = key->namlen; | |
602 | ||
603 | /* only uppercase if case-insensitive support is on */ | |
604 | if ((JFS_SBI(sb)->mntflag & JFS_OS2) == JFS_OS2) { | |
605 | ciToUpper(&ciKey); | |
606 | } | |
607 | BT_CLR(btstack); /* reset stack */ | |
608 | ||
609 | /* init level count for max pages to split */ | |
610 | btstack->nsplit = 1; | |
611 | ||
612 | /* | |
613 | * search down tree from root: | |
614 | * | |
615 | * between two consecutive entries of <Ki, Pi> and <Kj, Pj> of | |
616 | * internal page, child page Pi contains entry with k, Ki <= K < Kj. | |
617 | * | |
618 | * if entry with search key K is not found | |
619 | * internal page search find the entry with largest key Ki | |
620 | * less than K which point to the child page to search; | |
621 | * leaf page search find the entry with smallest key Kj | |
622 | * greater than K so that the returned index is the position of | |
623 | * the entry to be shifted right for insertion of new entry. | |
624 | * for empty tree, search key is greater than any key of the tree. | |
625 | * | |
626 | * by convention, root bn = 0. | |
627 | */ | |
628 | for (bn = 0;;) { | |
629 | /* get/pin the page to search */ | |
630 | DT_GETPAGE(ip, bn, mp, psize, p, rc); | |
631 | if (rc) | |
632 | goto dtSearch_Exit1; | |
633 | ||
634 | /* get sorted entry table of the page */ | |
635 | stbl = DT_GETSTBL(p); | |
636 | ||
637 | /* | |
638 | * binary search with search key K on the current page. | |
639 | */ | |
640 | for (base = 0, lim = p->header.nextindex; lim; lim >>= 1) { | |
641 | index = base + (lim >> 1); | |
642 | ||
643 | if (p->header.flag & BT_LEAF) { | |
644 | /* uppercase leaf name to compare */ | |
645 | cmp = | |
646 | ciCompare(&ciKey, p, stbl[index], | |
647 | JFS_SBI(sb)->mntflag); | |
648 | } else { | |
649 | /* router key is in uppercase */ | |
650 | ||
651 | cmp = dtCompare(&ciKey, p, stbl[index]); | |
652 | ||
653 | ||
654 | } | |
655 | if (cmp == 0) { | |
656 | /* | |
657 | * search hit | |
658 | */ | |
659 | /* search hit - leaf page: | |
660 | * return the entry found | |
661 | */ | |
662 | if (p->header.flag & BT_LEAF) { | |
663 | inumber = le32_to_cpu( | |
664 | ((struct ldtentry *) & p->slot[stbl[index]])->inumber); | |
665 | ||
666 | /* | |
667 | * search for JFS_LOOKUP | |
668 | */ | |
669 | if (flag == JFS_LOOKUP) { | |
670 | *data = inumber; | |
671 | rc = 0; | |
672 | goto out; | |
673 | } | |
674 | ||
675 | /* | |
676 | * search for JFS_CREATE | |
677 | */ | |
678 | if (flag == JFS_CREATE) { | |
679 | *data = inumber; | |
680 | rc = -EEXIST; | |
681 | goto out; | |
682 | } | |
683 | ||
684 | /* | |
685 | * search for JFS_REMOVE or JFS_RENAME | |
686 | */ | |
687 | if ((flag == JFS_REMOVE || | |
688 | flag == JFS_RENAME) && | |
689 | *data != inumber) { | |
690 | rc = -ESTALE; | |
691 | goto out; | |
692 | } | |
693 | ||
694 | /* | |
695 | * JFS_REMOVE|JFS_FINDDIR|JFS_RENAME | |
696 | */ | |
697 | /* save search result */ | |
698 | *data = inumber; | |
699 | btsp = btstack->top; | |
700 | btsp->bn = bn; | |
701 | btsp->index = index; | |
702 | btsp->mp = mp; | |
703 | ||
704 | rc = 0; | |
705 | goto dtSearch_Exit1; | |
706 | } | |
707 | ||
708 | /* search hit - internal page: | |
709 | * descend/search its child page | |
710 | */ | |
711 | goto getChild; | |
712 | } | |
713 | ||
714 | if (cmp > 0) { | |
715 | base = index + 1; | |
716 | --lim; | |
717 | } | |
718 | } | |
719 | ||
720 | /* | |
721 | * search miss | |
722 | * | |
723 | * base is the smallest index with key (Kj) greater than | |
724 | * search key (K) and may be zero or (maxindex + 1) index. | |
725 | */ | |
726 | /* | |
727 | * search miss - leaf page | |
728 | * | |
729 | * return location of entry (base) where new entry with | |
730 | * search key K is to be inserted. | |
731 | */ | |
732 | if (p->header.flag & BT_LEAF) { | |
733 | /* | |
734 | * search for JFS_LOOKUP, JFS_REMOVE, or JFS_RENAME | |
735 | */ | |
736 | if (flag == JFS_LOOKUP || flag == JFS_REMOVE || | |
737 | flag == JFS_RENAME) { | |
738 | rc = -ENOENT; | |
739 | goto out; | |
740 | } | |
741 | ||
742 | /* | |
743 | * search for JFS_CREATE|JFS_FINDDIR: | |
744 | * | |
745 | * save search result | |
746 | */ | |
747 | *data = 0; | |
748 | btsp = btstack->top; | |
749 | btsp->bn = bn; | |
750 | btsp->index = base; | |
751 | btsp->mp = mp; | |
752 | ||
753 | rc = 0; | |
754 | goto dtSearch_Exit1; | |
755 | } | |
756 | ||
757 | /* | |
758 | * search miss - internal page | |
759 | * | |
760 | * if base is non-zero, decrement base by one to get the parent | |
761 | * entry of the child page to search. | |
762 | */ | |
763 | index = base ? base - 1 : base; | |
764 | ||
765 | /* | |
766 | * go down to child page | |
767 | */ | |
768 | getChild: | |
769 | /* update max. number of pages to split */ | |
770 | if (BT_STACK_FULL(btstack)) { | |
771 | /* Something's corrupted, mark filesytem dirty so | |
772 | * chkdsk will fix it. | |
773 | */ | |
774 | jfs_error(sb, "stack overrun in dtSearch!"); | |
775 | BT_STACK_DUMP(btstack); | |
776 | rc = -EIO; | |
777 | goto out; | |
778 | } | |
779 | btstack->nsplit++; | |
780 | ||
781 | /* push (bn, index) of the parent page/entry */ | |
782 | BT_PUSH(btstack, bn, index); | |
783 | ||
784 | /* get the child page block number */ | |
785 | pxd = (pxd_t *) & p->slot[stbl[index]]; | |
786 | bn = addressPXD(pxd); | |
787 | psize = lengthPXD(pxd) << JFS_SBI(ip->i_sb)->l2bsize; | |
788 | ||
789 | /* unpin the parent page */ | |
790 | DT_PUTPAGE(mp); | |
791 | } | |
792 | ||
793 | out: | |
794 | DT_PUTPAGE(mp); | |
795 | ||
796 | dtSearch_Exit1: | |
797 | ||
798 | kfree(ciKey.name); | |
799 | ||
800 | dtSearch_Exit2: | |
801 | ||
802 | return rc; | |
803 | } | |
804 | ||
805 | ||
806 | /* | |
807 | * dtInsert() | |
808 | * | |
809 | * function: insert an entry to directory tree | |
810 | * | |
811 | * parameter: | |
812 | * | |
813 | * return: 0 - success; | |
814 | * errno - failure; | |
815 | */ | |
816 | int dtInsert(tid_t tid, struct inode *ip, | |
817 | struct component_name * name, ino_t * fsn, struct btstack * btstack) | |
818 | { | |
819 | int rc = 0; | |
820 | struct metapage *mp; /* meta-page buffer */ | |
821 | dtpage_t *p; /* base B+-tree index page */ | |
822 | s64 bn; | |
823 | int index; | |
824 | struct dtsplit split; /* split information */ | |
825 | ddata_t data; | |
826 | struct dt_lock *dtlck; | |
827 | int n; | |
828 | struct tlock *tlck; | |
829 | struct lv *lv; | |
830 | ||
831 | /* | |
832 | * retrieve search result | |
833 | * | |
834 | * dtSearch() returns (leaf page pinned, index at which to insert). | |
835 | * n.b. dtSearch() may return index of (maxindex + 1) of | |
836 | * the full page. | |
837 | */ | |
838 | DT_GETSEARCH(ip, btstack->top, bn, mp, p, index); | |
839 | ||
840 | /* | |
841 | * insert entry for new key | |
842 | */ | |
843 | if (DO_INDEX(ip)) { | |
844 | if (JFS_IP(ip)->next_index == DIREND) { | |
845 | DT_PUTPAGE(mp); | |
846 | return -EMLINK; | |
847 | } | |
848 | n = NDTLEAF(name->namlen); | |
849 | data.leaf.tid = tid; | |
850 | data.leaf.ip = ip; | |
851 | } else { | |
852 | n = NDTLEAF_LEGACY(name->namlen); | |
853 | data.leaf.ip = NULL; /* signifies legacy directory format */ | |
854 | } | |
855 | data.leaf.ino = *fsn; | |
856 | ||
857 | /* | |
858 | * leaf page does not have enough room for new entry: | |
859 | * | |
860 | * extend/split the leaf page; | |
861 | * | |
862 | * dtSplitUp() will insert the entry and unpin the leaf page. | |
863 | */ | |
864 | if (n > p->header.freecnt) { | |
865 | split.mp = mp; | |
866 | split.index = index; | |
867 | split.nslot = n; | |
868 | split.key = name; | |
869 | split.data = &data; | |
870 | rc = dtSplitUp(tid, ip, &split, btstack); | |
871 | return rc; | |
872 | } | |
873 | ||
874 | /* | |
875 | * leaf page does have enough room for new entry: | |
876 | * | |
877 | * insert the new data entry into the leaf page; | |
878 | */ | |
879 | BT_MARK_DIRTY(mp, ip); | |
880 | /* | |
881 | * acquire a transaction lock on the leaf page | |
882 | */ | |
883 | tlck = txLock(tid, ip, mp, tlckDTREE | tlckENTRY); | |
884 | dtlck = (struct dt_lock *) & tlck->lock; | |
885 | ASSERT(dtlck->index == 0); | |
886 | lv = & dtlck->lv[0]; | |
887 | ||
888 | /* linelock header */ | |
889 | lv->offset = 0; | |
890 | lv->length = 1; | |
891 | dtlck->index++; | |
892 | ||
893 | dtInsertEntry(p, index, name, &data, &dtlck); | |
894 | ||
895 | /* linelock stbl of non-root leaf page */ | |
896 | if (!(p->header.flag & BT_ROOT)) { | |
897 | if (dtlck->index >= dtlck->maxcnt) | |
898 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
899 | lv = & dtlck->lv[dtlck->index]; | |
900 | n = index >> L2DTSLOTSIZE; | |
901 | lv->offset = p->header.stblindex + n; | |
902 | lv->length = | |
903 | ((p->header.nextindex - 1) >> L2DTSLOTSIZE) - n + 1; | |
904 | dtlck->index++; | |
905 | } | |
906 | ||
907 | /* unpin the leaf page */ | |
908 | DT_PUTPAGE(mp); | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
913 | ||
914 | /* | |
915 | * dtSplitUp() | |
916 | * | |
917 | * function: propagate insertion bottom up; | |
918 | * | |
919 | * parameter: | |
920 | * | |
921 | * return: 0 - success; | |
922 | * errno - failure; | |
923 | * leaf page unpinned; | |
924 | */ | |
925 | static int dtSplitUp(tid_t tid, | |
926 | struct inode *ip, struct dtsplit * split, struct btstack * btstack) | |
927 | { | |
928 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); | |
929 | int rc = 0; | |
930 | struct metapage *smp; | |
931 | dtpage_t *sp; /* split page */ | |
932 | struct metapage *rmp; | |
933 | dtpage_t *rp; /* new right page split from sp */ | |
934 | pxd_t rpxd; /* new right page extent descriptor */ | |
935 | struct metapage *lmp; | |
936 | dtpage_t *lp; /* left child page */ | |
937 | int skip; /* index of entry of insertion */ | |
938 | struct btframe *parent; /* parent page entry on traverse stack */ | |
939 | s64 xaddr, nxaddr; | |
940 | int xlen, xsize; | |
941 | struct pxdlist pxdlist; | |
942 | pxd_t *pxd; | |
943 | struct component_name key = { 0, NULL }; | |
944 | ddata_t *data = split->data; | |
945 | int n; | |
946 | struct dt_lock *dtlck; | |
947 | struct tlock *tlck; | |
948 | struct lv *lv; | |
949 | int quota_allocation = 0; | |
950 | ||
951 | /* get split page */ | |
952 | smp = split->mp; | |
953 | sp = DT_PAGE(ip, smp); | |
954 | ||
955 | key.name = | |
956 | (wchar_t *) kmalloc((JFS_NAME_MAX + 2) * sizeof(wchar_t), | |
957 | GFP_NOFS); | |
958 | if (key.name == 0) { | |
959 | DT_PUTPAGE(smp); | |
960 | rc = -ENOMEM; | |
961 | goto dtSplitUp_Exit; | |
962 | } | |
963 | ||
964 | /* | |
965 | * split leaf page | |
966 | * | |
967 | * The split routines insert the new entry, and | |
968 | * acquire txLock as appropriate. | |
969 | */ | |
970 | /* | |
971 | * split root leaf page: | |
972 | */ | |
973 | if (sp->header.flag & BT_ROOT) { | |
974 | /* | |
975 | * allocate a single extent child page | |
976 | */ | |
977 | xlen = 1; | |
978 | n = sbi->bsize >> L2DTSLOTSIZE; | |
979 | n -= (n + 31) >> L2DTSLOTSIZE; /* stbl size */ | |
980 | n -= DTROOTMAXSLOT - sp->header.freecnt; /* header + entries */ | |
981 | if (n <= split->nslot) | |
982 | xlen++; | |
983 | if ((rc = dbAlloc(ip, 0, (s64) xlen, &xaddr))) { | |
984 | DT_PUTPAGE(smp); | |
985 | goto freeKeyName; | |
986 | } | |
987 | ||
988 | pxdlist.maxnpxd = 1; | |
989 | pxdlist.npxd = 0; | |
990 | pxd = &pxdlist.pxd[0]; | |
991 | PXDaddress(pxd, xaddr); | |
992 | PXDlength(pxd, xlen); | |
993 | split->pxdlist = &pxdlist; | |
994 | rc = dtSplitRoot(tid, ip, split, &rmp); | |
995 | ||
996 | if (rc) | |
997 | dbFree(ip, xaddr, xlen); | |
998 | else | |
999 | DT_PUTPAGE(rmp); | |
1000 | ||
1001 | DT_PUTPAGE(smp); | |
1002 | ||
1003 | goto freeKeyName; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * extend first leaf page | |
1008 | * | |
1009 | * extend the 1st extent if less than buffer page size | |
1010 | * (dtExtendPage() reurns leaf page unpinned) | |
1011 | */ | |
1012 | pxd = &sp->header.self; | |
1013 | xlen = lengthPXD(pxd); | |
1014 | xsize = xlen << sbi->l2bsize; | |
1015 | if (xsize < PSIZE) { | |
1016 | xaddr = addressPXD(pxd); | |
1017 | n = xsize >> L2DTSLOTSIZE; | |
1018 | n -= (n + 31) >> L2DTSLOTSIZE; /* stbl size */ | |
1019 | if ((n + sp->header.freecnt) <= split->nslot) | |
1020 | n = xlen + (xlen << 1); | |
1021 | else | |
1022 | n = xlen; | |
1023 | ||
1024 | /* Allocate blocks to quota. */ | |
1025 | if (DQUOT_ALLOC_BLOCK(ip, n)) { | |
1026 | rc = -EDQUOT; | |
1027 | goto extendOut; | |
1028 | } | |
1029 | quota_allocation += n; | |
1030 | ||
1031 | if ((rc = dbReAlloc(sbi->ipbmap, xaddr, (s64) xlen, | |
1032 | (s64) n, &nxaddr))) | |
1033 | goto extendOut; | |
1034 | ||
1035 | pxdlist.maxnpxd = 1; | |
1036 | pxdlist.npxd = 0; | |
1037 | pxd = &pxdlist.pxd[0]; | |
1038 | PXDaddress(pxd, nxaddr) | |
1039 | PXDlength(pxd, xlen + n); | |
1040 | split->pxdlist = &pxdlist; | |
1041 | if ((rc = dtExtendPage(tid, ip, split, btstack))) { | |
1042 | nxaddr = addressPXD(pxd); | |
1043 | if (xaddr != nxaddr) { | |
1044 | /* free relocated extent */ | |
1045 | xlen = lengthPXD(pxd); | |
1046 | dbFree(ip, nxaddr, (s64) xlen); | |
1047 | } else { | |
1048 | /* free extended delta */ | |
1049 | xlen = lengthPXD(pxd) - n; | |
1050 | xaddr = addressPXD(pxd) + xlen; | |
1051 | dbFree(ip, xaddr, (s64) n); | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | extendOut: | |
1056 | DT_PUTPAGE(smp); | |
1057 | goto freeKeyName; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * split leaf page <sp> into <sp> and a new right page <rp>. | |
1062 | * | |
1063 | * return <rp> pinned and its extent descriptor <rpxd> | |
1064 | */ | |
1065 | /* | |
1066 | * allocate new directory page extent and | |
1067 | * new index page(s) to cover page split(s) | |
1068 | * | |
1069 | * allocation hint: ? | |
1070 | */ | |
1071 | n = btstack->nsplit; | |
1072 | pxdlist.maxnpxd = pxdlist.npxd = 0; | |
1073 | xlen = sbi->nbperpage; | |
1074 | for (pxd = pxdlist.pxd; n > 0; n--, pxd++) { | |
1075 | if ((rc = dbAlloc(ip, 0, (s64) xlen, &xaddr)) == 0) { | |
1076 | PXDaddress(pxd, xaddr); | |
1077 | PXDlength(pxd, xlen); | |
1078 | pxdlist.maxnpxd++; | |
1079 | continue; | |
1080 | } | |
1081 | ||
1082 | DT_PUTPAGE(smp); | |
1083 | ||
1084 | /* undo allocation */ | |
1085 | goto splitOut; | |
1086 | } | |
1087 | ||
1088 | split->pxdlist = &pxdlist; | |
1089 | if ((rc = dtSplitPage(tid, ip, split, &rmp, &rp, &rpxd))) { | |
1090 | DT_PUTPAGE(smp); | |
1091 | ||
1092 | /* undo allocation */ | |
1093 | goto splitOut; | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * propagate up the router entry for the leaf page just split | |
1098 | * | |
1099 | * insert a router entry for the new page into the parent page, | |
1100 | * propagate the insert/split up the tree by walking back the stack | |
1101 | * of (bn of parent page, index of child page entry in parent page) | |
1102 | * that were traversed during the search for the page that split. | |
1103 | * | |
1104 | * the propagation of insert/split up the tree stops if the root | |
1105 | * splits or the page inserted into doesn't have to split to hold | |
1106 | * the new entry. | |
1107 | * | |
1108 | * the parent entry for the split page remains the same, and | |
1109 | * a new entry is inserted at its right with the first key and | |
1110 | * block number of the new right page. | |
1111 | * | |
1112 | * There are a maximum of 4 pages pinned at any time: | |
1113 | * two children, left parent and right parent (when the parent splits). | |
1114 | * keep the child pages pinned while working on the parent. | |
1115 | * make sure that all pins are released at exit. | |
1116 | */ | |
1117 | while ((parent = BT_POP(btstack)) != NULL) { | |
1118 | /* parent page specified by stack frame <parent> */ | |
1119 | ||
1120 | /* keep current child pages (<lp>, <rp>) pinned */ | |
1121 | lmp = smp; | |
1122 | lp = sp; | |
1123 | ||
1124 | /* | |
1125 | * insert router entry in parent for new right child page <rp> | |
1126 | */ | |
1127 | /* get the parent page <sp> */ | |
1128 | DT_GETPAGE(ip, parent->bn, smp, PSIZE, sp, rc); | |
1129 | if (rc) { | |
1130 | DT_PUTPAGE(lmp); | |
1131 | DT_PUTPAGE(rmp); | |
1132 | goto splitOut; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * The new key entry goes ONE AFTER the index of parent entry, | |
1137 | * because the split was to the right. | |
1138 | */ | |
1139 | skip = parent->index + 1; | |
1140 | ||
1141 | /* | |
1142 | * compute the key for the router entry | |
1143 | * | |
1144 | * key suffix compression: | |
1145 | * for internal pages that have leaf pages as children, | |
1146 | * retain only what's needed to distinguish between | |
1147 | * the new entry and the entry on the page to its left. | |
1148 | * If the keys compare equal, retain the entire key. | |
1149 | * | |
1150 | * note that compression is performed only at computing | |
1151 | * router key at the lowest internal level. | |
1152 | * further compression of the key between pairs of higher | |
1153 | * level internal pages loses too much information and | |
1154 | * the search may fail. | |
1155 | * (e.g., two adjacent leaf pages of {a, ..., x} {xx, ...,} | |
1156 | * results in two adjacent parent entries (a)(xx). | |
1157 | * if split occurs between these two entries, and | |
1158 | * if compression is applied, the router key of parent entry | |
1159 | * of right page (x) will divert search for x into right | |
1160 | * subtree and miss x in the left subtree.) | |
1161 | * | |
1162 | * the entire key must be retained for the next-to-leftmost | |
1163 | * internal key at any level of the tree, or search may fail | |
1164 | * (e.g., ?) | |
1165 | */ | |
1166 | switch (rp->header.flag & BT_TYPE) { | |
1167 | case BT_LEAF: | |
1168 | /* | |
1169 | * compute the length of prefix for suffix compression | |
1170 | * between last entry of left page and first entry | |
1171 | * of right page | |
1172 | */ | |
1173 | if ((sp->header.flag & BT_ROOT && skip > 1) || | |
1174 | sp->header.prev != 0 || skip > 1) { | |
1175 | /* compute uppercase router prefix key */ | |
1176 | rc = ciGetLeafPrefixKey(lp, | |
1177 | lp->header.nextindex-1, | |
1178 | rp, 0, &key, | |
1179 | sbi->mntflag); | |
1180 | if (rc) { | |
1181 | DT_PUTPAGE(lmp); | |
1182 | DT_PUTPAGE(rmp); | |
1183 | DT_PUTPAGE(smp); | |
1184 | goto splitOut; | |
1185 | } | |
1186 | } else { | |
1187 | /* next to leftmost entry of | |
1188 | lowest internal level */ | |
1189 | ||
1190 | /* compute uppercase router key */ | |
1191 | dtGetKey(rp, 0, &key, sbi->mntflag); | |
1192 | key.name[key.namlen] = 0; | |
1193 | ||
1194 | if ((sbi->mntflag & JFS_OS2) == JFS_OS2) | |
1195 | ciToUpper(&key); | |
1196 | } | |
1197 | ||
1198 | n = NDTINTERNAL(key.namlen); | |
1199 | break; | |
1200 | ||
1201 | case BT_INTERNAL: | |
1202 | dtGetKey(rp, 0, &key, sbi->mntflag); | |
1203 | n = NDTINTERNAL(key.namlen); | |
1204 | break; | |
1205 | ||
1206 | default: | |
1207 | jfs_err("dtSplitUp(): UFO!"); | |
1208 | break; | |
1209 | } | |
1210 | ||
1211 | /* unpin left child page */ | |
1212 | DT_PUTPAGE(lmp); | |
1213 | ||
1214 | /* | |
1215 | * compute the data for the router entry | |
1216 | */ | |
1217 | data->xd = rpxd; /* child page xd */ | |
1218 | ||
1219 | /* | |
1220 | * parent page is full - split the parent page | |
1221 | */ | |
1222 | if (n > sp->header.freecnt) { | |
1223 | /* init for parent page split */ | |
1224 | split->mp = smp; | |
1225 | split->index = skip; /* index at insert */ | |
1226 | split->nslot = n; | |
1227 | split->key = &key; | |
1228 | /* split->data = data; */ | |
1229 | ||
1230 | /* unpin right child page */ | |
1231 | DT_PUTPAGE(rmp); | |
1232 | ||
1233 | /* The split routines insert the new entry, | |
1234 | * acquire txLock as appropriate. | |
1235 | * return <rp> pinned and its block number <rbn>. | |
1236 | */ | |
1237 | rc = (sp->header.flag & BT_ROOT) ? | |
1238 | dtSplitRoot(tid, ip, split, &rmp) : | |
1239 | dtSplitPage(tid, ip, split, &rmp, &rp, &rpxd); | |
1240 | if (rc) { | |
1241 | DT_PUTPAGE(smp); | |
1242 | goto splitOut; | |
1243 | } | |
1244 | ||
1245 | /* smp and rmp are pinned */ | |
1246 | } | |
1247 | /* | |
1248 | * parent page is not full - insert router entry in parent page | |
1249 | */ | |
1250 | else { | |
1251 | BT_MARK_DIRTY(smp, ip); | |
1252 | /* | |
1253 | * acquire a transaction lock on the parent page | |
1254 | */ | |
1255 | tlck = txLock(tid, ip, smp, tlckDTREE | tlckENTRY); | |
1256 | dtlck = (struct dt_lock *) & tlck->lock; | |
1257 | ASSERT(dtlck->index == 0); | |
1258 | lv = & dtlck->lv[0]; | |
1259 | ||
1260 | /* linelock header */ | |
1261 | lv->offset = 0; | |
1262 | lv->length = 1; | |
1263 | dtlck->index++; | |
1264 | ||
1265 | /* linelock stbl of non-root parent page */ | |
1266 | if (!(sp->header.flag & BT_ROOT)) { | |
1267 | lv++; | |
1268 | n = skip >> L2DTSLOTSIZE; | |
1269 | lv->offset = sp->header.stblindex + n; | |
1270 | lv->length = | |
1271 | ((sp->header.nextindex - | |
1272 | 1) >> L2DTSLOTSIZE) - n + 1; | |
1273 | dtlck->index++; | |
1274 | } | |
1275 | ||
1276 | dtInsertEntry(sp, skip, &key, data, &dtlck); | |
1277 | ||
1278 | /* exit propagate up */ | |
1279 | break; | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | /* unpin current split and its right page */ | |
1284 | DT_PUTPAGE(smp); | |
1285 | DT_PUTPAGE(rmp); | |
1286 | ||
1287 | /* | |
1288 | * free remaining extents allocated for split | |
1289 | */ | |
1290 | splitOut: | |
1291 | n = pxdlist.npxd; | |
1292 | pxd = &pxdlist.pxd[n]; | |
1293 | for (; n < pxdlist.maxnpxd; n++, pxd++) | |
1294 | dbFree(ip, addressPXD(pxd), (s64) lengthPXD(pxd)); | |
1295 | ||
1296 | freeKeyName: | |
1297 | kfree(key.name); | |
1298 | ||
1299 | /* Rollback quota allocation */ | |
1300 | if (rc && quota_allocation) | |
1301 | DQUOT_FREE_BLOCK(ip, quota_allocation); | |
1302 | ||
1303 | dtSplitUp_Exit: | |
1304 | ||
1305 | return rc; | |
1306 | } | |
1307 | ||
1308 | ||
1309 | /* | |
1310 | * dtSplitPage() | |
1311 | * | |
1312 | * function: Split a non-root page of a btree. | |
1313 | * | |
1314 | * parameter: | |
1315 | * | |
1316 | * return: 0 - success; | |
1317 | * errno - failure; | |
1318 | * return split and new page pinned; | |
1319 | */ | |
1320 | static int dtSplitPage(tid_t tid, struct inode *ip, struct dtsplit * split, | |
1321 | struct metapage ** rmpp, dtpage_t ** rpp, pxd_t * rpxdp) | |
1322 | { | |
1323 | int rc = 0; | |
1324 | struct metapage *smp; | |
1325 | dtpage_t *sp; | |
1326 | struct metapage *rmp; | |
1327 | dtpage_t *rp; /* new right page allocated */ | |
1328 | s64 rbn; /* new right page block number */ | |
1329 | struct metapage *mp; | |
1330 | dtpage_t *p; | |
1331 | s64 nextbn; | |
1332 | struct pxdlist *pxdlist; | |
1333 | pxd_t *pxd; | |
1334 | int skip, nextindex, half, left, nxt, off, si; | |
1335 | struct ldtentry *ldtentry; | |
1336 | struct idtentry *idtentry; | |
1337 | u8 *stbl; | |
1338 | struct dtslot *f; | |
1339 | int fsi, stblsize; | |
1340 | int n; | |
1341 | struct dt_lock *sdtlck, *rdtlck; | |
1342 | struct tlock *tlck; | |
1343 | struct dt_lock *dtlck; | |
1344 | struct lv *slv, *rlv, *lv; | |
1345 | ||
1346 | /* get split page */ | |
1347 | smp = split->mp; | |
1348 | sp = DT_PAGE(ip, smp); | |
1349 | ||
1350 | /* | |
1351 | * allocate the new right page for the split | |
1352 | */ | |
1353 | pxdlist = split->pxdlist; | |
1354 | pxd = &pxdlist->pxd[pxdlist->npxd]; | |
1355 | pxdlist->npxd++; | |
1356 | rbn = addressPXD(pxd); | |
1357 | rmp = get_metapage(ip, rbn, PSIZE, 1); | |
1358 | if (rmp == NULL) | |
1359 | return -EIO; | |
1360 | ||
1361 | /* Allocate blocks to quota. */ | |
1362 | if (DQUOT_ALLOC_BLOCK(ip, lengthPXD(pxd))) { | |
1363 | release_metapage(rmp); | |
1364 | return -EDQUOT; | |
1365 | } | |
1366 | ||
1367 | jfs_info("dtSplitPage: ip:0x%p smp:0x%p rmp:0x%p", ip, smp, rmp); | |
1368 | ||
1369 | BT_MARK_DIRTY(rmp, ip); | |
1370 | /* | |
1371 | * acquire a transaction lock on the new right page | |
1372 | */ | |
1373 | tlck = txLock(tid, ip, rmp, tlckDTREE | tlckNEW); | |
1374 | rdtlck = (struct dt_lock *) & tlck->lock; | |
1375 | ||
1376 | rp = (dtpage_t *) rmp->data; | |
1377 | *rpp = rp; | |
1378 | rp->header.self = *pxd; | |
1379 | ||
1380 | BT_MARK_DIRTY(smp, ip); | |
1381 | /* | |
1382 | * acquire a transaction lock on the split page | |
1383 | * | |
1384 | * action: | |
1385 | */ | |
1386 | tlck = txLock(tid, ip, smp, tlckDTREE | tlckENTRY); | |
1387 | sdtlck = (struct dt_lock *) & tlck->lock; | |
1388 | ||
1389 | /* linelock header of split page */ | |
1390 | ASSERT(sdtlck->index == 0); | |
1391 | slv = & sdtlck->lv[0]; | |
1392 | slv->offset = 0; | |
1393 | slv->length = 1; | |
1394 | sdtlck->index++; | |
1395 | ||
1396 | /* | |
1397 | * initialize/update sibling pointers between sp and rp | |
1398 | */ | |
1399 | nextbn = le64_to_cpu(sp->header.next); | |
1400 | rp->header.next = cpu_to_le64(nextbn); | |
1401 | rp->header.prev = cpu_to_le64(addressPXD(&sp->header.self)); | |
1402 | sp->header.next = cpu_to_le64(rbn); | |
1403 | ||
1404 | /* | |
1405 | * initialize new right page | |
1406 | */ | |
1407 | rp->header.flag = sp->header.flag; | |
1408 | ||
1409 | /* compute sorted entry table at start of extent data area */ | |
1410 | rp->header.nextindex = 0; | |
1411 | rp->header.stblindex = 1; | |
1412 | ||
1413 | n = PSIZE >> L2DTSLOTSIZE; | |
1414 | rp->header.maxslot = n; | |
1415 | stblsize = (n + 31) >> L2DTSLOTSIZE; /* in unit of slot */ | |
1416 | ||
1417 | /* init freelist */ | |
1418 | fsi = rp->header.stblindex + stblsize; | |
1419 | rp->header.freelist = fsi; | |
1420 | rp->header.freecnt = rp->header.maxslot - fsi; | |
1421 | ||
1422 | /* | |
1423 | * sequential append at tail: append without split | |
1424 | * | |
1425 | * If splitting the last page on a level because of appending | |
1426 | * a entry to it (skip is maxentry), it's likely that the access is | |
1427 | * sequential. Adding an empty page on the side of the level is less | |
1428 | * work and can push the fill factor much higher than normal. | |
1429 | * If we're wrong it's no big deal, we'll just do the split the right | |
1430 | * way next time. | |
1431 | * (It may look like it's equally easy to do a similar hack for | |
1432 | * reverse sorted data, that is, split the tree left, | |
1433 | * but it's not. Be my guest.) | |
1434 | */ | |
1435 | if (nextbn == 0 && split->index == sp->header.nextindex) { | |
1436 | /* linelock header + stbl (first slot) of new page */ | |
1437 | rlv = & rdtlck->lv[rdtlck->index]; | |
1438 | rlv->offset = 0; | |
1439 | rlv->length = 2; | |
1440 | rdtlck->index++; | |
1441 | ||
1442 | /* | |
1443 | * initialize freelist of new right page | |
1444 | */ | |
1445 | f = &rp->slot[fsi]; | |
1446 | for (fsi++; fsi < rp->header.maxslot; f++, fsi++) | |
1447 | f->next = fsi; | |
1448 | f->next = -1; | |
1449 | ||
1450 | /* insert entry at the first entry of the new right page */ | |
1451 | dtInsertEntry(rp, 0, split->key, split->data, &rdtlck); | |
1452 | ||
1453 | goto out; | |
1454 | } | |
1455 | ||
1456 | /* | |
1457 | * non-sequential insert (at possibly middle page) | |
1458 | */ | |
1459 | ||
1460 | /* | |
1461 | * update prev pointer of previous right sibling page; | |
1462 | */ | |
1463 | if (nextbn != 0) { | |
1464 | DT_GETPAGE(ip, nextbn, mp, PSIZE, p, rc); | |
1465 | if (rc) { | |
1466 | discard_metapage(rmp); | |
1467 | return rc; | |
1468 | } | |
1469 | ||
1470 | BT_MARK_DIRTY(mp, ip); | |
1471 | /* | |
1472 | * acquire a transaction lock on the next page | |
1473 | */ | |
1474 | tlck = txLock(tid, ip, mp, tlckDTREE | tlckRELINK); | |
1475 | jfs_info("dtSplitPage: tlck = 0x%p, ip = 0x%p, mp=0x%p", | |
1476 | tlck, ip, mp); | |
1477 | dtlck = (struct dt_lock *) & tlck->lock; | |
1478 | ||
1479 | /* linelock header of previous right sibling page */ | |
1480 | lv = & dtlck->lv[dtlck->index]; | |
1481 | lv->offset = 0; | |
1482 | lv->length = 1; | |
1483 | dtlck->index++; | |
1484 | ||
1485 | p->header.prev = cpu_to_le64(rbn); | |
1486 | ||
1487 | DT_PUTPAGE(mp); | |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * split the data between the split and right pages. | |
1492 | */ | |
1493 | skip = split->index; | |
1494 | half = (PSIZE >> L2DTSLOTSIZE) >> 1; /* swag */ | |
1495 | left = 0; | |
1496 | ||
1497 | /* | |
1498 | * compute fill factor for split pages | |
1499 | * | |
1500 | * <nxt> traces the next entry to move to rp | |
1501 | * <off> traces the next entry to stay in sp | |
1502 | */ | |
1503 | stbl = (u8 *) & sp->slot[sp->header.stblindex]; | |
1504 | nextindex = sp->header.nextindex; | |
1505 | for (nxt = off = 0; nxt < nextindex; ++off) { | |
1506 | if (off == skip) | |
1507 | /* check for fill factor with new entry size */ | |
1508 | n = split->nslot; | |
1509 | else { | |
1510 | si = stbl[nxt]; | |
1511 | switch (sp->header.flag & BT_TYPE) { | |
1512 | case BT_LEAF: | |
1513 | ldtentry = (struct ldtentry *) & sp->slot[si]; | |
1514 | if (DO_INDEX(ip)) | |
1515 | n = NDTLEAF(ldtentry->namlen); | |
1516 | else | |
1517 | n = NDTLEAF_LEGACY(ldtentry-> | |
1518 | namlen); | |
1519 | break; | |
1520 | ||
1521 | case BT_INTERNAL: | |
1522 | idtentry = (struct idtentry *) & sp->slot[si]; | |
1523 | n = NDTINTERNAL(idtentry->namlen); | |
1524 | break; | |
1525 | ||
1526 | default: | |
1527 | break; | |
1528 | } | |
1529 | ||
1530 | ++nxt; /* advance to next entry to move in sp */ | |
1531 | } | |
1532 | ||
1533 | left += n; | |
1534 | if (left >= half) | |
1535 | break; | |
1536 | } | |
1537 | ||
1538 | /* <nxt> poins to the 1st entry to move */ | |
1539 | ||
1540 | /* | |
1541 | * move entries to right page | |
1542 | * | |
1543 | * dtMoveEntry() initializes rp and reserves entry for insertion | |
1544 | * | |
1545 | * split page moved out entries are linelocked; | |
1546 | * new/right page moved in entries are linelocked; | |
1547 | */ | |
1548 | /* linelock header + stbl of new right page */ | |
1549 | rlv = & rdtlck->lv[rdtlck->index]; | |
1550 | rlv->offset = 0; | |
1551 | rlv->length = 5; | |
1552 | rdtlck->index++; | |
1553 | ||
1554 | dtMoveEntry(sp, nxt, rp, &sdtlck, &rdtlck, DO_INDEX(ip)); | |
1555 | ||
1556 | sp->header.nextindex = nxt; | |
1557 | ||
1558 | /* | |
1559 | * finalize freelist of new right page | |
1560 | */ | |
1561 | fsi = rp->header.freelist; | |
1562 | f = &rp->slot[fsi]; | |
1563 | for (fsi++; fsi < rp->header.maxslot; f++, fsi++) | |
1564 | f->next = fsi; | |
1565 | f->next = -1; | |
1566 | ||
1567 | /* | |
1568 | * Update directory index table for entries now in right page | |
1569 | */ | |
1570 | if ((rp->header.flag & BT_LEAF) && DO_INDEX(ip)) { | |
1571 | s64 lblock; | |
1572 | ||
1573 | mp = NULL; | |
1574 | stbl = DT_GETSTBL(rp); | |
1575 | for (n = 0; n < rp->header.nextindex; n++) { | |
1576 | ldtentry = (struct ldtentry *) & rp->slot[stbl[n]]; | |
1577 | modify_index(tid, ip, le32_to_cpu(ldtentry->index), | |
1578 | rbn, n, &mp, &lblock); | |
1579 | } | |
1580 | if (mp) | |
1581 | release_metapage(mp); | |
1582 | } | |
1583 | ||
1584 | /* | |
1585 | * the skipped index was on the left page, | |
1586 | */ | |
1587 | if (skip <= off) { | |
1588 | /* insert the new entry in the split page */ | |
1589 | dtInsertEntry(sp, skip, split->key, split->data, &sdtlck); | |
1590 | ||
1591 | /* linelock stbl of split page */ | |
1592 | if (sdtlck->index >= sdtlck->maxcnt) | |
1593 | sdtlck = (struct dt_lock *) txLinelock(sdtlck); | |
1594 | slv = & sdtlck->lv[sdtlck->index]; | |
1595 | n = skip >> L2DTSLOTSIZE; | |
1596 | slv->offset = sp->header.stblindex + n; | |
1597 | slv->length = | |
1598 | ((sp->header.nextindex - 1) >> L2DTSLOTSIZE) - n + 1; | |
1599 | sdtlck->index++; | |
1600 | } | |
1601 | /* | |
1602 | * the skipped index was on the right page, | |
1603 | */ | |
1604 | else { | |
1605 | /* adjust the skip index to reflect the new position */ | |
1606 | skip -= nxt; | |
1607 | ||
1608 | /* insert the new entry in the right page */ | |
1609 | dtInsertEntry(rp, skip, split->key, split->data, &rdtlck); | |
1610 | } | |
1611 | ||
1612 | out: | |
1613 | *rmpp = rmp; | |
1614 | *rpxdp = *pxd; | |
1615 | ||
1616 | return rc; | |
1617 | } | |
1618 | ||
1619 | ||
1620 | /* | |
1621 | * dtExtendPage() | |
1622 | * | |
1623 | * function: extend 1st/only directory leaf page | |
1624 | * | |
1625 | * parameter: | |
1626 | * | |
1627 | * return: 0 - success; | |
1628 | * errno - failure; | |
1629 | * return extended page pinned; | |
1630 | */ | |
1631 | static int dtExtendPage(tid_t tid, | |
1632 | struct inode *ip, struct dtsplit * split, struct btstack * btstack) | |
1633 | { | |
1634 | struct super_block *sb = ip->i_sb; | |
1635 | int rc; | |
1636 | struct metapage *smp, *pmp, *mp; | |
1637 | dtpage_t *sp, *pp; | |
1638 | struct pxdlist *pxdlist; | |
1639 | pxd_t *pxd, *tpxd; | |
1640 | int xlen, xsize; | |
1641 | int newstblindex, newstblsize; | |
1642 | int oldstblindex, oldstblsize; | |
1643 | int fsi, last; | |
1644 | struct dtslot *f; | |
1645 | struct btframe *parent; | |
1646 | int n; | |
1647 | struct dt_lock *dtlck; | |
1648 | s64 xaddr, txaddr; | |
1649 | struct tlock *tlck; | |
1650 | struct pxd_lock *pxdlock; | |
1651 | struct lv *lv; | |
1652 | uint type; | |
1653 | struct ldtentry *ldtentry; | |
1654 | u8 *stbl; | |
1655 | ||
1656 | /* get page to extend */ | |
1657 | smp = split->mp; | |
1658 | sp = DT_PAGE(ip, smp); | |
1659 | ||
1660 | /* get parent/root page */ | |
1661 | parent = BT_POP(btstack); | |
1662 | DT_GETPAGE(ip, parent->bn, pmp, PSIZE, pp, rc); | |
1663 | if (rc) | |
1664 | return (rc); | |
1665 | ||
1666 | /* | |
1667 | * extend the extent | |
1668 | */ | |
1669 | pxdlist = split->pxdlist; | |
1670 | pxd = &pxdlist->pxd[pxdlist->npxd]; | |
1671 | pxdlist->npxd++; | |
1672 | ||
1673 | xaddr = addressPXD(pxd); | |
1674 | tpxd = &sp->header.self; | |
1675 | txaddr = addressPXD(tpxd); | |
1676 | /* in-place extension */ | |
1677 | if (xaddr == txaddr) { | |
1678 | type = tlckEXTEND; | |
1679 | } | |
1680 | /* relocation */ | |
1681 | else { | |
1682 | type = tlckNEW; | |
1683 | ||
1684 | /* save moved extent descriptor for later free */ | |
1685 | tlck = txMaplock(tid, ip, tlckDTREE | tlckRELOCATE); | |
1686 | pxdlock = (struct pxd_lock *) & tlck->lock; | |
1687 | pxdlock->flag = mlckFREEPXD; | |
1688 | pxdlock->pxd = sp->header.self; | |
1689 | pxdlock->index = 1; | |
1690 | ||
1691 | /* | |
1692 | * Update directory index table to reflect new page address | |
1693 | */ | |
1694 | if (DO_INDEX(ip)) { | |
1695 | s64 lblock; | |
1696 | ||
1697 | mp = NULL; | |
1698 | stbl = DT_GETSTBL(sp); | |
1699 | for (n = 0; n < sp->header.nextindex; n++) { | |
1700 | ldtentry = | |
1701 | (struct ldtentry *) & sp->slot[stbl[n]]; | |
1702 | modify_index(tid, ip, | |
1703 | le32_to_cpu(ldtentry->index), | |
1704 | xaddr, n, &mp, &lblock); | |
1705 | } | |
1706 | if (mp) | |
1707 | release_metapage(mp); | |
1708 | } | |
1709 | } | |
1710 | ||
1711 | /* | |
1712 | * extend the page | |
1713 | */ | |
1714 | sp->header.self = *pxd; | |
1715 | ||
1716 | jfs_info("dtExtendPage: ip:0x%p smp:0x%p sp:0x%p", ip, smp, sp); | |
1717 | ||
1718 | BT_MARK_DIRTY(smp, ip); | |
1719 | /* | |
1720 | * acquire a transaction lock on the extended/leaf page | |
1721 | */ | |
1722 | tlck = txLock(tid, ip, smp, tlckDTREE | type); | |
1723 | dtlck = (struct dt_lock *) & tlck->lock; | |
1724 | lv = & dtlck->lv[0]; | |
1725 | ||
1726 | /* update buffer extent descriptor of extended page */ | |
1727 | xlen = lengthPXD(pxd); | |
1728 | xsize = xlen << JFS_SBI(sb)->l2bsize; | |
1729 | #ifdef _STILL_TO_PORT | |
1730 | bmSetXD(smp, xaddr, xsize); | |
1731 | #endif /* _STILL_TO_PORT */ | |
1732 | ||
1733 | /* | |
1734 | * copy old stbl to new stbl at start of extended area | |
1735 | */ | |
1736 | oldstblindex = sp->header.stblindex; | |
1737 | oldstblsize = (sp->header.maxslot + 31) >> L2DTSLOTSIZE; | |
1738 | newstblindex = sp->header.maxslot; | |
1739 | n = xsize >> L2DTSLOTSIZE; | |
1740 | newstblsize = (n + 31) >> L2DTSLOTSIZE; | |
1741 | memcpy(&sp->slot[newstblindex], &sp->slot[oldstblindex], | |
1742 | sp->header.nextindex); | |
1743 | ||
1744 | /* | |
1745 | * in-line extension: linelock old area of extended page | |
1746 | */ | |
1747 | if (type == tlckEXTEND) { | |
1748 | /* linelock header */ | |
1749 | lv->offset = 0; | |
1750 | lv->length = 1; | |
1751 | dtlck->index++; | |
1752 | lv++; | |
1753 | ||
1754 | /* linelock new stbl of extended page */ | |
1755 | lv->offset = newstblindex; | |
1756 | lv->length = newstblsize; | |
1757 | } | |
1758 | /* | |
1759 | * relocation: linelock whole relocated area | |
1760 | */ | |
1761 | else { | |
1762 | lv->offset = 0; | |
1763 | lv->length = sp->header.maxslot + newstblsize; | |
1764 | } | |
1765 | ||
1766 | dtlck->index++; | |
1767 | ||
1768 | sp->header.maxslot = n; | |
1769 | sp->header.stblindex = newstblindex; | |
1770 | /* sp->header.nextindex remains the same */ | |
1771 | ||
1772 | /* | |
1773 | * add old stbl region at head of freelist | |
1774 | */ | |
1775 | fsi = oldstblindex; | |
1776 | f = &sp->slot[fsi]; | |
1777 | last = sp->header.freelist; | |
1778 | for (n = 0; n < oldstblsize; n++, fsi++, f++) { | |
1779 | f->next = last; | |
1780 | last = fsi; | |
1781 | } | |
1782 | sp->header.freelist = last; | |
1783 | sp->header.freecnt += oldstblsize; | |
1784 | ||
1785 | /* | |
1786 | * append free region of newly extended area at tail of freelist | |
1787 | */ | |
1788 | /* init free region of newly extended area */ | |
1789 | fsi = n = newstblindex + newstblsize; | |
1790 | f = &sp->slot[fsi]; | |
1791 | for (fsi++; fsi < sp->header.maxslot; f++, fsi++) | |
1792 | f->next = fsi; | |
1793 | f->next = -1; | |
1794 | ||
1795 | /* append new free region at tail of old freelist */ | |
1796 | fsi = sp->header.freelist; | |
1797 | if (fsi == -1) | |
1798 | sp->header.freelist = n; | |
1799 | else { | |
1800 | do { | |
1801 | f = &sp->slot[fsi]; | |
1802 | fsi = f->next; | |
1803 | } while (fsi != -1); | |
1804 | ||
1805 | f->next = n; | |
1806 | } | |
1807 | ||
1808 | sp->header.freecnt += sp->header.maxslot - n; | |
1809 | ||
1810 | /* | |
1811 | * insert the new entry | |
1812 | */ | |
1813 | dtInsertEntry(sp, split->index, split->key, split->data, &dtlck); | |
1814 | ||
1815 | BT_MARK_DIRTY(pmp, ip); | |
1816 | /* | |
1817 | * linelock any freeslots residing in old extent | |
1818 | */ | |
1819 | if (type == tlckEXTEND) { | |
1820 | n = sp->header.maxslot >> 2; | |
1821 | if (sp->header.freelist < n) | |
1822 | dtLinelockFreelist(sp, n, &dtlck); | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * update parent entry on the parent/root page | |
1827 | */ | |
1828 | /* | |
1829 | * acquire a transaction lock on the parent/root page | |
1830 | */ | |
1831 | tlck = txLock(tid, ip, pmp, tlckDTREE | tlckENTRY); | |
1832 | dtlck = (struct dt_lock *) & tlck->lock; | |
1833 | lv = & dtlck->lv[dtlck->index]; | |
1834 | ||
1835 | /* linelock parent entry - 1st slot */ | |
1836 | lv->offset = 1; | |
1837 | lv->length = 1; | |
1838 | dtlck->index++; | |
1839 | ||
1840 | /* update the parent pxd for page extension */ | |
1841 | tpxd = (pxd_t *) & pp->slot[1]; | |
1842 | *tpxd = *pxd; | |
1843 | ||
1844 | DT_PUTPAGE(pmp); | |
1845 | return 0; | |
1846 | } | |
1847 | ||
1848 | ||
1849 | /* | |
1850 | * dtSplitRoot() | |
1851 | * | |
1852 | * function: | |
1853 | * split the full root page into | |
1854 | * original/root/split page and new right page | |
1855 | * i.e., root remains fixed in tree anchor (inode) and | |
1856 | * the root is copied to a single new right child page | |
1857 | * since root page << non-root page, and | |
1858 | * the split root page contains a single entry for the | |
1859 | * new right child page. | |
1860 | * | |
1861 | * parameter: | |
1862 | * | |
1863 | * return: 0 - success; | |
1864 | * errno - failure; | |
1865 | * return new page pinned; | |
1866 | */ | |
1867 | static int dtSplitRoot(tid_t tid, | |
1868 | struct inode *ip, struct dtsplit * split, struct metapage ** rmpp) | |
1869 | { | |
1870 | struct super_block *sb = ip->i_sb; | |
1871 | struct metapage *smp; | |
1872 | dtroot_t *sp; | |
1873 | struct metapage *rmp; | |
1874 | dtpage_t *rp; | |
1875 | s64 rbn; | |
1876 | int xlen; | |
1877 | int xsize; | |
1878 | struct dtslot *f; | |
1879 | s8 *stbl; | |
1880 | int fsi, stblsize, n; | |
1881 | struct idtentry *s; | |
1882 | pxd_t *ppxd; | |
1883 | struct pxdlist *pxdlist; | |
1884 | pxd_t *pxd; | |
1885 | struct dt_lock *dtlck; | |
1886 | struct tlock *tlck; | |
1887 | struct lv *lv; | |
1888 | ||
1889 | /* get split root page */ | |
1890 | smp = split->mp; | |
1891 | sp = &JFS_IP(ip)->i_dtroot; | |
1892 | ||
1893 | /* | |
1894 | * allocate/initialize a single (right) child page | |
1895 | * | |
1896 | * N.B. at first split, a one (or two) block to fit new entry | |
1897 | * is allocated; at subsequent split, a full page is allocated; | |
1898 | */ | |
1899 | pxdlist = split->pxdlist; | |
1900 | pxd = &pxdlist->pxd[pxdlist->npxd]; | |
1901 | pxdlist->npxd++; | |
1902 | rbn = addressPXD(pxd); | |
1903 | xlen = lengthPXD(pxd); | |
1904 | xsize = xlen << JFS_SBI(sb)->l2bsize; | |
1905 | rmp = get_metapage(ip, rbn, xsize, 1); | |
1906 | if (!rmp) | |
1907 | return -EIO; | |
1908 | ||
1909 | rp = rmp->data; | |
1910 | ||
1911 | /* Allocate blocks to quota. */ | |
1912 | if (DQUOT_ALLOC_BLOCK(ip, lengthPXD(pxd))) { | |
1913 | release_metapage(rmp); | |
1914 | return -EDQUOT; | |
1915 | } | |
1916 | ||
1917 | BT_MARK_DIRTY(rmp, ip); | |
1918 | /* | |
1919 | * acquire a transaction lock on the new right page | |
1920 | */ | |
1921 | tlck = txLock(tid, ip, rmp, tlckDTREE | tlckNEW); | |
1922 | dtlck = (struct dt_lock *) & tlck->lock; | |
1923 | ||
1924 | rp->header.flag = | |
1925 | (sp->header.flag & BT_LEAF) ? BT_LEAF : BT_INTERNAL; | |
1926 | rp->header.self = *pxd; | |
1927 | ||
1928 | /* initialize sibling pointers */ | |
1929 | rp->header.next = 0; | |
1930 | rp->header.prev = 0; | |
1931 | ||
1932 | /* | |
1933 | * move in-line root page into new right page extent | |
1934 | */ | |
1935 | /* linelock header + copied entries + new stbl (1st slot) in new page */ | |
1936 | ASSERT(dtlck->index == 0); | |
1937 | lv = & dtlck->lv[0]; | |
1938 | lv->offset = 0; | |
1939 | lv->length = 10; /* 1 + 8 + 1 */ | |
1940 | dtlck->index++; | |
1941 | ||
1942 | n = xsize >> L2DTSLOTSIZE; | |
1943 | rp->header.maxslot = n; | |
1944 | stblsize = (n + 31) >> L2DTSLOTSIZE; | |
1945 | ||
1946 | /* copy old stbl to new stbl at start of extended area */ | |
1947 | rp->header.stblindex = DTROOTMAXSLOT; | |
1948 | stbl = (s8 *) & rp->slot[DTROOTMAXSLOT]; | |
1949 | memcpy(stbl, sp->header.stbl, sp->header.nextindex); | |
1950 | rp->header.nextindex = sp->header.nextindex; | |
1951 | ||
1952 | /* copy old data area to start of new data area */ | |
1953 | memcpy(&rp->slot[1], &sp->slot[1], IDATASIZE); | |
1954 | ||
1955 | /* | |
1956 | * append free region of newly extended area at tail of freelist | |
1957 | */ | |
1958 | /* init free region of newly extended area */ | |
1959 | fsi = n = DTROOTMAXSLOT + stblsize; | |
1960 | f = &rp->slot[fsi]; | |
1961 | for (fsi++; fsi < rp->header.maxslot; f++, fsi++) | |
1962 | f->next = fsi; | |
1963 | f->next = -1; | |
1964 | ||
1965 | /* append new free region at tail of old freelist */ | |
1966 | fsi = sp->header.freelist; | |
1967 | if (fsi == -1) | |
1968 | rp->header.freelist = n; | |
1969 | else { | |
1970 | rp->header.freelist = fsi; | |
1971 | ||
1972 | do { | |
1973 | f = &rp->slot[fsi]; | |
1974 | fsi = f->next; | |
1975 | } while (fsi != -1); | |
1976 | ||
1977 | f->next = n; | |
1978 | } | |
1979 | ||
1980 | rp->header.freecnt = sp->header.freecnt + rp->header.maxslot - n; | |
1981 | ||
1982 | /* | |
1983 | * Update directory index table for entries now in right page | |
1984 | */ | |
1985 | if ((rp->header.flag & BT_LEAF) && DO_INDEX(ip)) { | |
1986 | s64 lblock; | |
1987 | struct metapage *mp = NULL; | |
1988 | struct ldtentry *ldtentry; | |
1989 | ||
1990 | stbl = DT_GETSTBL(rp); | |
1991 | for (n = 0; n < rp->header.nextindex; n++) { | |
1992 | ldtentry = (struct ldtentry *) & rp->slot[stbl[n]]; | |
1993 | modify_index(tid, ip, le32_to_cpu(ldtentry->index), | |
1994 | rbn, n, &mp, &lblock); | |
1995 | } | |
1996 | if (mp) | |
1997 | release_metapage(mp); | |
1998 | } | |
1999 | /* | |
2000 | * insert the new entry into the new right/child page | |
2001 | * (skip index in the new right page will not change) | |
2002 | */ | |
2003 | dtInsertEntry(rp, split->index, split->key, split->data, &dtlck); | |
2004 | ||
2005 | /* | |
2006 | * reset parent/root page | |
2007 | * | |
2008 | * set the 1st entry offset to 0, which force the left-most key | |
2009 | * at any level of the tree to be less than any search key. | |
2010 | * | |
2011 | * The btree comparison code guarantees that the left-most key on any | |
2012 | * level of the tree is never used, so it doesn't need to be filled in. | |
2013 | */ | |
2014 | BT_MARK_DIRTY(smp, ip); | |
2015 | /* | |
2016 | * acquire a transaction lock on the root page (in-memory inode) | |
2017 | */ | |
2018 | tlck = txLock(tid, ip, smp, tlckDTREE | tlckNEW | tlckBTROOT); | |
2019 | dtlck = (struct dt_lock *) & tlck->lock; | |
2020 | ||
2021 | /* linelock root */ | |
2022 | ASSERT(dtlck->index == 0); | |
2023 | lv = & dtlck->lv[0]; | |
2024 | lv->offset = 0; | |
2025 | lv->length = DTROOTMAXSLOT; | |
2026 | dtlck->index++; | |
2027 | ||
2028 | /* update page header of root */ | |
2029 | if (sp->header.flag & BT_LEAF) { | |
2030 | sp->header.flag &= ~BT_LEAF; | |
2031 | sp->header.flag |= BT_INTERNAL; | |
2032 | } | |
2033 | ||
2034 | /* init the first entry */ | |
2035 | s = (struct idtentry *) & sp->slot[DTENTRYSTART]; | |
2036 | ppxd = (pxd_t *) s; | |
2037 | *ppxd = *pxd; | |
2038 | s->next = -1; | |
2039 | s->namlen = 0; | |
2040 | ||
2041 | stbl = sp->header.stbl; | |
2042 | stbl[0] = DTENTRYSTART; | |
2043 | sp->header.nextindex = 1; | |
2044 | ||
2045 | /* init freelist */ | |
2046 | fsi = DTENTRYSTART + 1; | |
2047 | f = &sp->slot[fsi]; | |
2048 | ||
2049 | /* init free region of remaining area */ | |
2050 | for (fsi++; fsi < DTROOTMAXSLOT; f++, fsi++) | |
2051 | f->next = fsi; | |
2052 | f->next = -1; | |
2053 | ||
2054 | sp->header.freelist = DTENTRYSTART + 1; | |
2055 | sp->header.freecnt = DTROOTMAXSLOT - (DTENTRYSTART + 1); | |
2056 | ||
2057 | *rmpp = rmp; | |
2058 | ||
2059 | return 0; | |
2060 | } | |
2061 | ||
2062 | ||
2063 | /* | |
2064 | * dtDelete() | |
2065 | * | |
2066 | * function: delete the entry(s) referenced by a key. | |
2067 | * | |
2068 | * parameter: | |
2069 | * | |
2070 | * return: | |
2071 | */ | |
2072 | int dtDelete(tid_t tid, | |
2073 | struct inode *ip, struct component_name * key, ino_t * ino, int flag) | |
2074 | { | |
2075 | int rc = 0; | |
2076 | s64 bn; | |
2077 | struct metapage *mp, *imp; | |
2078 | dtpage_t *p; | |
2079 | int index; | |
2080 | struct btstack btstack; | |
2081 | struct dt_lock *dtlck; | |
2082 | struct tlock *tlck; | |
2083 | struct lv *lv; | |
2084 | int i; | |
2085 | struct ldtentry *ldtentry; | |
2086 | u8 *stbl; | |
2087 | u32 table_index, next_index; | |
2088 | struct metapage *nmp; | |
2089 | dtpage_t *np; | |
2090 | ||
2091 | /* | |
2092 | * search for the entry to delete: | |
2093 | * | |
2094 | * dtSearch() returns (leaf page pinned, index at which to delete). | |
2095 | */ | |
2096 | if ((rc = dtSearch(ip, key, ino, &btstack, flag))) | |
2097 | return rc; | |
2098 | ||
2099 | /* retrieve search result */ | |
2100 | DT_GETSEARCH(ip, btstack.top, bn, mp, p, index); | |
2101 | ||
2102 | /* | |
2103 | * We need to find put the index of the next entry into the | |
2104 | * directory index table in order to resume a readdir from this | |
2105 | * entry. | |
2106 | */ | |
2107 | if (DO_INDEX(ip)) { | |
2108 | stbl = DT_GETSTBL(p); | |
2109 | ldtentry = (struct ldtentry *) & p->slot[stbl[index]]; | |
2110 | table_index = le32_to_cpu(ldtentry->index); | |
2111 | if (index == (p->header.nextindex - 1)) { | |
2112 | /* | |
2113 | * Last entry in this leaf page | |
2114 | */ | |
2115 | if ((p->header.flag & BT_ROOT) | |
2116 | || (p->header.next == 0)) | |
2117 | next_index = -1; | |
2118 | else { | |
2119 | /* Read next leaf page */ | |
2120 | DT_GETPAGE(ip, le64_to_cpu(p->header.next), | |
2121 | nmp, PSIZE, np, rc); | |
2122 | if (rc) | |
2123 | next_index = -1; | |
2124 | else { | |
2125 | stbl = DT_GETSTBL(np); | |
2126 | ldtentry = | |
2127 | (struct ldtentry *) & np-> | |
2128 | slot[stbl[0]]; | |
2129 | next_index = | |
2130 | le32_to_cpu(ldtentry->index); | |
2131 | DT_PUTPAGE(nmp); | |
2132 | } | |
2133 | } | |
2134 | } else { | |
2135 | ldtentry = | |
2136 | (struct ldtentry *) & p->slot[stbl[index + 1]]; | |
2137 | next_index = le32_to_cpu(ldtentry->index); | |
2138 | } | |
2139 | free_index(tid, ip, table_index, next_index); | |
2140 | } | |
2141 | /* | |
2142 | * the leaf page becomes empty, delete the page | |
2143 | */ | |
2144 | if (p->header.nextindex == 1) { | |
2145 | /* delete empty page */ | |
2146 | rc = dtDeleteUp(tid, ip, mp, p, &btstack); | |
2147 | } | |
2148 | /* | |
2149 | * the leaf page has other entries remaining: | |
2150 | * | |
2151 | * delete the entry from the leaf page. | |
2152 | */ | |
2153 | else { | |
2154 | BT_MARK_DIRTY(mp, ip); | |
2155 | /* | |
2156 | * acquire a transaction lock on the leaf page | |
2157 | */ | |
2158 | tlck = txLock(tid, ip, mp, tlckDTREE | tlckENTRY); | |
2159 | dtlck = (struct dt_lock *) & tlck->lock; | |
2160 | ||
2161 | /* | |
2162 | * Do not assume that dtlck->index will be zero. During a | |
2163 | * rename within a directory, this transaction may have | |
2164 | * modified this page already when adding the new entry. | |
2165 | */ | |
2166 | ||
2167 | /* linelock header */ | |
2168 | if (dtlck->index >= dtlck->maxcnt) | |
2169 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
2170 | lv = & dtlck->lv[dtlck->index]; | |
2171 | lv->offset = 0; | |
2172 | lv->length = 1; | |
2173 | dtlck->index++; | |
2174 | ||
2175 | /* linelock stbl of non-root leaf page */ | |
2176 | if (!(p->header.flag & BT_ROOT)) { | |
2177 | if (dtlck->index >= dtlck->maxcnt) | |
2178 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
2179 | lv = & dtlck->lv[dtlck->index]; | |
2180 | i = index >> L2DTSLOTSIZE; | |
2181 | lv->offset = p->header.stblindex + i; | |
2182 | lv->length = | |
2183 | ((p->header.nextindex - 1) >> L2DTSLOTSIZE) - | |
2184 | i + 1; | |
2185 | dtlck->index++; | |
2186 | } | |
2187 | ||
2188 | /* free the leaf entry */ | |
2189 | dtDeleteEntry(p, index, &dtlck); | |
2190 | ||
2191 | /* | |
2192 | * Update directory index table for entries moved in stbl | |
2193 | */ | |
2194 | if (DO_INDEX(ip) && index < p->header.nextindex) { | |
2195 | s64 lblock; | |
2196 | ||
2197 | imp = NULL; | |
2198 | stbl = DT_GETSTBL(p); | |
2199 | for (i = index; i < p->header.nextindex; i++) { | |
2200 | ldtentry = | |
2201 | (struct ldtentry *) & p->slot[stbl[i]]; | |
2202 | modify_index(tid, ip, | |
2203 | le32_to_cpu(ldtentry->index), | |
2204 | bn, i, &imp, &lblock); | |
2205 | } | |
2206 | if (imp) | |
2207 | release_metapage(imp); | |
2208 | } | |
2209 | ||
2210 | DT_PUTPAGE(mp); | |
2211 | } | |
2212 | ||
2213 | return rc; | |
2214 | } | |
2215 | ||
2216 | ||
2217 | /* | |
2218 | * dtDeleteUp() | |
2219 | * | |
2220 | * function: | |
2221 | * free empty pages as propagating deletion up the tree | |
2222 | * | |
2223 | * parameter: | |
2224 | * | |
2225 | * return: | |
2226 | */ | |
2227 | static int dtDeleteUp(tid_t tid, struct inode *ip, | |
2228 | struct metapage * fmp, dtpage_t * fp, struct btstack * btstack) | |
2229 | { | |
2230 | int rc = 0; | |
2231 | struct metapage *mp; | |
2232 | dtpage_t *p; | |
2233 | int index, nextindex; | |
2234 | int xlen; | |
2235 | struct btframe *parent; | |
2236 | struct dt_lock *dtlck; | |
2237 | struct tlock *tlck; | |
2238 | struct lv *lv; | |
2239 | struct pxd_lock *pxdlock; | |
2240 | int i; | |
2241 | ||
2242 | /* | |
2243 | * keep the root leaf page which has become empty | |
2244 | */ | |
2245 | if (BT_IS_ROOT(fmp)) { | |
2246 | /* | |
2247 | * reset the root | |
2248 | * | |
2249 | * dtInitRoot() acquires txlock on the root | |
2250 | */ | |
2251 | dtInitRoot(tid, ip, PARENT(ip)); | |
2252 | ||
2253 | DT_PUTPAGE(fmp); | |
2254 | ||
2255 | return 0; | |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * free the non-root leaf page | |
2260 | */ | |
2261 | /* | |
2262 | * acquire a transaction lock on the page | |
2263 | * | |
2264 | * write FREEXTENT|NOREDOPAGE log record | |
2265 | * N.B. linelock is overlaid as freed extent descriptor, and | |
2266 | * the buffer page is freed; | |
2267 | */ | |
2268 | tlck = txMaplock(tid, ip, tlckDTREE | tlckFREE); | |
2269 | pxdlock = (struct pxd_lock *) & tlck->lock; | |
2270 | pxdlock->flag = mlckFREEPXD; | |
2271 | pxdlock->pxd = fp->header.self; | |
2272 | pxdlock->index = 1; | |
2273 | ||
2274 | /* update sibling pointers */ | |
2275 | if ((rc = dtRelink(tid, ip, fp))) { | |
2276 | BT_PUTPAGE(fmp); | |
2277 | return rc; | |
2278 | } | |
2279 | ||
2280 | xlen = lengthPXD(&fp->header.self); | |
2281 | ||
2282 | /* Free quota allocation. */ | |
2283 | DQUOT_FREE_BLOCK(ip, xlen); | |
2284 | ||
2285 | /* free/invalidate its buffer page */ | |
2286 | discard_metapage(fmp); | |
2287 | ||
2288 | /* | |
2289 | * propagate page deletion up the directory tree | |
2290 | * | |
2291 | * If the delete from the parent page makes it empty, | |
2292 | * continue all the way up the tree. | |
2293 | * stop if the root page is reached (which is never deleted) or | |
2294 | * if the entry deletion does not empty the page. | |
2295 | */ | |
2296 | while ((parent = BT_POP(btstack)) != NULL) { | |
2297 | /* pin the parent page <sp> */ | |
2298 | DT_GETPAGE(ip, parent->bn, mp, PSIZE, p, rc); | |
2299 | if (rc) | |
2300 | return rc; | |
2301 | ||
2302 | /* | |
2303 | * free the extent of the child page deleted | |
2304 | */ | |
2305 | index = parent->index; | |
2306 | ||
2307 | /* | |
2308 | * delete the entry for the child page from parent | |
2309 | */ | |
2310 | nextindex = p->header.nextindex; | |
2311 | ||
2312 | /* | |
2313 | * the parent has the single entry being deleted: | |
2314 | * | |
2315 | * free the parent page which has become empty. | |
2316 | */ | |
2317 | if (nextindex == 1) { | |
2318 | /* | |
2319 | * keep the root internal page which has become empty | |
2320 | */ | |
2321 | if (p->header.flag & BT_ROOT) { | |
2322 | /* | |
2323 | * reset the root | |
2324 | * | |
2325 | * dtInitRoot() acquires txlock on the root | |
2326 | */ | |
2327 | dtInitRoot(tid, ip, PARENT(ip)); | |
2328 | ||
2329 | DT_PUTPAGE(mp); | |
2330 | ||
2331 | return 0; | |
2332 | } | |
2333 | /* | |
2334 | * free the parent page | |
2335 | */ | |
2336 | else { | |
2337 | /* | |
2338 | * acquire a transaction lock on the page | |
2339 | * | |
2340 | * write FREEXTENT|NOREDOPAGE log record | |
2341 | */ | |
2342 | tlck = | |
2343 | txMaplock(tid, ip, | |
2344 | tlckDTREE | tlckFREE); | |
2345 | pxdlock = (struct pxd_lock *) & tlck->lock; | |
2346 | pxdlock->flag = mlckFREEPXD; | |
2347 | pxdlock->pxd = p->header.self; | |
2348 | pxdlock->index = 1; | |
2349 | ||
2350 | /* update sibling pointers */ | |
2351 | if ((rc = dtRelink(tid, ip, p))) { | |
2352 | DT_PUTPAGE(mp); | |
2353 | return rc; | |
2354 | } | |
2355 | ||
2356 | xlen = lengthPXD(&p->header.self); | |
2357 | ||
2358 | /* Free quota allocation */ | |
2359 | DQUOT_FREE_BLOCK(ip, xlen); | |
2360 | ||
2361 | /* free/invalidate its buffer page */ | |
2362 | discard_metapage(mp); | |
2363 | ||
2364 | /* propagate up */ | |
2365 | continue; | |
2366 | } | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * the parent has other entries remaining: | |
2371 | * | |
2372 | * delete the router entry from the parent page. | |
2373 | */ | |
2374 | BT_MARK_DIRTY(mp, ip); | |
2375 | /* | |
2376 | * acquire a transaction lock on the page | |
2377 | * | |
2378 | * action: router entry deletion | |
2379 | */ | |
2380 | tlck = txLock(tid, ip, mp, tlckDTREE | tlckENTRY); | |
2381 | dtlck = (struct dt_lock *) & tlck->lock; | |
2382 | ||
2383 | /* linelock header */ | |
2384 | if (dtlck->index >= dtlck->maxcnt) | |
2385 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
2386 | lv = & dtlck->lv[dtlck->index]; | |
2387 | lv->offset = 0; | |
2388 | lv->length = 1; | |
2389 | dtlck->index++; | |
2390 | ||
2391 | /* linelock stbl of non-root leaf page */ | |
2392 | if (!(p->header.flag & BT_ROOT)) { | |
2393 | if (dtlck->index < dtlck->maxcnt) | |
2394 | lv++; | |
2395 | else { | |
2396 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
2397 | lv = & dtlck->lv[0]; | |
2398 | } | |
2399 | i = index >> L2DTSLOTSIZE; | |
2400 | lv->offset = p->header.stblindex + i; | |
2401 | lv->length = | |
2402 | ((p->header.nextindex - 1) >> L2DTSLOTSIZE) - | |
2403 | i + 1; | |
2404 | dtlck->index++; | |
2405 | } | |
2406 | ||
2407 | /* free the router entry */ | |
2408 | dtDeleteEntry(p, index, &dtlck); | |
2409 | ||
2410 | /* reset key of new leftmost entry of level (for consistency) */ | |
2411 | if (index == 0 && | |
2412 | ((p->header.flag & BT_ROOT) || p->header.prev == 0)) | |
2413 | dtTruncateEntry(p, 0, &dtlck); | |
2414 | ||
2415 | /* unpin the parent page */ | |
2416 | DT_PUTPAGE(mp); | |
2417 | ||
2418 | /* exit propagation up */ | |
2419 | break; | |
2420 | } | |
2421 | ||
2422 | return 0; | |
2423 | } | |
2424 | ||
2425 | #ifdef _NOTYET | |
2426 | /* | |
2427 | * NAME: dtRelocate() | |
2428 | * | |
2429 | * FUNCTION: relocate dtpage (internal or leaf) of directory; | |
2430 | * This function is mainly used by defragfs utility. | |
2431 | */ | |
2432 | int dtRelocate(tid_t tid, struct inode *ip, s64 lmxaddr, pxd_t * opxd, | |
2433 | s64 nxaddr) | |
2434 | { | |
2435 | int rc = 0; | |
2436 | struct metapage *mp, *pmp, *lmp, *rmp; | |
2437 | dtpage_t *p, *pp, *rp = 0, *lp= 0; | |
2438 | s64 bn; | |
2439 | int index; | |
2440 | struct btstack btstack; | |
2441 | pxd_t *pxd; | |
2442 | s64 oxaddr, nextbn, prevbn; | |
2443 | int xlen, xsize; | |
2444 | struct tlock *tlck; | |
2445 | struct dt_lock *dtlck; | |
2446 | struct pxd_lock *pxdlock; | |
2447 | s8 *stbl; | |
2448 | struct lv *lv; | |
2449 | ||
2450 | oxaddr = addressPXD(opxd); | |
2451 | xlen = lengthPXD(opxd); | |
2452 | ||
2453 | jfs_info("dtRelocate: lmxaddr:%Ld xaddr:%Ld:%Ld xlen:%d", | |
2454 | (long long)lmxaddr, (long long)oxaddr, (long long)nxaddr, | |
2455 | xlen); | |
2456 | ||
2457 | /* | |
2458 | * 1. get the internal parent dtpage covering | |
2459 | * router entry for the tartget page to be relocated; | |
2460 | */ | |
2461 | rc = dtSearchNode(ip, lmxaddr, opxd, &btstack); | |
2462 | if (rc) | |
2463 | return rc; | |
2464 | ||
2465 | /* retrieve search result */ | |
2466 | DT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index); | |
2467 | jfs_info("dtRelocate: parent router entry validated."); | |
2468 | ||
2469 | /* | |
2470 | * 2. relocate the target dtpage | |
2471 | */ | |
2472 | /* read in the target page from src extent */ | |
2473 | DT_GETPAGE(ip, oxaddr, mp, PSIZE, p, rc); | |
2474 | if (rc) { | |
2475 | /* release the pinned parent page */ | |
2476 | DT_PUTPAGE(pmp); | |
2477 | return rc; | |
2478 | } | |
2479 | ||
2480 | /* | |
2481 | * read in sibling pages if any to update sibling pointers; | |
2482 | */ | |
2483 | rmp = NULL; | |
2484 | if (p->header.next) { | |
2485 | nextbn = le64_to_cpu(p->header.next); | |
2486 | DT_GETPAGE(ip, nextbn, rmp, PSIZE, rp, rc); | |
2487 | if (rc) { | |
2488 | DT_PUTPAGE(mp); | |
2489 | DT_PUTPAGE(pmp); | |
2490 | return (rc); | |
2491 | } | |
2492 | } | |
2493 | ||
2494 | lmp = NULL; | |
2495 | if (p->header.prev) { | |
2496 | prevbn = le64_to_cpu(p->header.prev); | |
2497 | DT_GETPAGE(ip, prevbn, lmp, PSIZE, lp, rc); | |
2498 | if (rc) { | |
2499 | DT_PUTPAGE(mp); | |
2500 | DT_PUTPAGE(pmp); | |
2501 | if (rmp) | |
2502 | DT_PUTPAGE(rmp); | |
2503 | return (rc); | |
2504 | } | |
2505 | } | |
2506 | ||
2507 | /* at this point, all xtpages to be updated are in memory */ | |
2508 | ||
2509 | /* | |
2510 | * update sibling pointers of sibling dtpages if any; | |
2511 | */ | |
2512 | if (lmp) { | |
2513 | tlck = txLock(tid, ip, lmp, tlckDTREE | tlckRELINK); | |
2514 | dtlck = (struct dt_lock *) & tlck->lock; | |
2515 | /* linelock header */ | |
2516 | ASSERT(dtlck->index == 0); | |
2517 | lv = & dtlck->lv[0]; | |
2518 | lv->offset = 0; | |
2519 | lv->length = 1; | |
2520 | dtlck->index++; | |
2521 | ||
2522 | lp->header.next = cpu_to_le64(nxaddr); | |
2523 | DT_PUTPAGE(lmp); | |
2524 | } | |
2525 | ||
2526 | if (rmp) { | |
2527 | tlck = txLock(tid, ip, rmp, tlckDTREE | tlckRELINK); | |
2528 | dtlck = (struct dt_lock *) & tlck->lock; | |
2529 | /* linelock header */ | |
2530 | ASSERT(dtlck->index == 0); | |
2531 | lv = & dtlck->lv[0]; | |
2532 | lv->offset = 0; | |
2533 | lv->length = 1; | |
2534 | dtlck->index++; | |
2535 | ||
2536 | rp->header.prev = cpu_to_le64(nxaddr); | |
2537 | DT_PUTPAGE(rmp); | |
2538 | } | |
2539 | ||
2540 | /* | |
2541 | * update the target dtpage to be relocated | |
2542 | * | |
2543 | * write LOG_REDOPAGE of LOG_NEW type for dst page | |
2544 | * for the whole target page (logredo() will apply | |
2545 | * after image and update bmap for allocation of the | |
2546 | * dst extent), and update bmap for allocation of | |
2547 | * the dst extent; | |
2548 | */ | |
2549 | tlck = txLock(tid, ip, mp, tlckDTREE | tlckNEW); | |
2550 | dtlck = (struct dt_lock *) & tlck->lock; | |
2551 | /* linelock header */ | |
2552 | ASSERT(dtlck->index == 0); | |
2553 | lv = & dtlck->lv[0]; | |
2554 | ||
2555 | /* update the self address in the dtpage header */ | |
2556 | pxd = &p->header.self; | |
2557 | PXDaddress(pxd, nxaddr); | |
2558 | ||
2559 | /* the dst page is the same as the src page, i.e., | |
2560 | * linelock for afterimage of the whole page; | |
2561 | */ | |
2562 | lv->offset = 0; | |
2563 | lv->length = p->header.maxslot; | |
2564 | dtlck->index++; | |
2565 | ||
2566 | /* update the buffer extent descriptor of the dtpage */ | |
2567 | xsize = xlen << JFS_SBI(ip->i_sb)->l2bsize; | |
2568 | #ifdef _STILL_TO_PORT | |
2569 | bmSetXD(mp, nxaddr, xsize); | |
2570 | #endif /* _STILL_TO_PORT */ | |
2571 | /* unpin the relocated page */ | |
2572 | DT_PUTPAGE(mp); | |
2573 | jfs_info("dtRelocate: target dtpage relocated."); | |
2574 | ||
2575 | /* the moved extent is dtpage, then a LOG_NOREDOPAGE log rec | |
2576 | * needs to be written (in logredo(), the LOG_NOREDOPAGE log rec | |
2577 | * will also force a bmap update ). | |
2578 | */ | |
2579 | ||
2580 | /* | |
2581 | * 3. acquire maplock for the source extent to be freed; | |
2582 | */ | |
2583 | /* for dtpage relocation, write a LOG_NOREDOPAGE record | |
2584 | * for the source dtpage (logredo() will init NoRedoPage | |
2585 | * filter and will also update bmap for free of the source | |
2586 | * dtpage), and upadte bmap for free of the source dtpage; | |
2587 | */ | |
2588 | tlck = txMaplock(tid, ip, tlckDTREE | tlckFREE); | |
2589 | pxdlock = (struct pxd_lock *) & tlck->lock; | |
2590 | pxdlock->flag = mlckFREEPXD; | |
2591 | PXDaddress(&pxdlock->pxd, oxaddr); | |
2592 | PXDlength(&pxdlock->pxd, xlen); | |
2593 | pxdlock->index = 1; | |
2594 | ||
2595 | /* | |
2596 | * 4. update the parent router entry for relocation; | |
2597 | * | |
2598 | * acquire tlck for the parent entry covering the target dtpage; | |
2599 | * write LOG_REDOPAGE to apply after image only; | |
2600 | */ | |
2601 | jfs_info("dtRelocate: update parent router entry."); | |
2602 | tlck = txLock(tid, ip, pmp, tlckDTREE | tlckENTRY); | |
2603 | dtlck = (struct dt_lock *) & tlck->lock; | |
2604 | lv = & dtlck->lv[dtlck->index]; | |
2605 | ||
2606 | /* update the PXD with the new address */ | |
2607 | stbl = DT_GETSTBL(pp); | |
2608 | pxd = (pxd_t *) & pp->slot[stbl[index]]; | |
2609 | PXDaddress(pxd, nxaddr); | |
2610 | lv->offset = stbl[index]; | |
2611 | lv->length = 1; | |
2612 | dtlck->index++; | |
2613 | ||
2614 | /* unpin the parent dtpage */ | |
2615 | DT_PUTPAGE(pmp); | |
2616 | ||
2617 | return rc; | |
2618 | } | |
2619 | ||
2620 | /* | |
2621 | * NAME: dtSearchNode() | |
2622 | * | |
2623 | * FUNCTION: Search for an dtpage containing a specified address | |
2624 | * This function is mainly used by defragfs utility. | |
2625 | * | |
2626 | * NOTE: Search result on stack, the found page is pinned at exit. | |
2627 | * The result page must be an internal dtpage. | |
2628 | * lmxaddr give the address of the left most page of the | |
2629 | * dtree level, in which the required dtpage resides. | |
2630 | */ | |
2631 | static int dtSearchNode(struct inode *ip, s64 lmxaddr, pxd_t * kpxd, | |
2632 | struct btstack * btstack) | |
2633 | { | |
2634 | int rc = 0; | |
2635 | s64 bn; | |
2636 | struct metapage *mp; | |
2637 | dtpage_t *p; | |
2638 | int psize = 288; /* initial in-line directory */ | |
2639 | s8 *stbl; | |
2640 | int i; | |
2641 | pxd_t *pxd; | |
2642 | struct btframe *btsp; | |
2643 | ||
2644 | BT_CLR(btstack); /* reset stack */ | |
2645 | ||
2646 | /* | |
2647 | * descend tree to the level with specified leftmost page | |
2648 | * | |
2649 | * by convention, root bn = 0. | |
2650 | */ | |
2651 | for (bn = 0;;) { | |
2652 | /* get/pin the page to search */ | |
2653 | DT_GETPAGE(ip, bn, mp, psize, p, rc); | |
2654 | if (rc) | |
2655 | return rc; | |
2656 | ||
2657 | /* does the xaddr of leftmost page of the levevl | |
2658 | * matches levevl search key ? | |
2659 | */ | |
2660 | if (p->header.flag & BT_ROOT) { | |
2661 | if (lmxaddr == 0) | |
2662 | break; | |
2663 | } else if (addressPXD(&p->header.self) == lmxaddr) | |
2664 | break; | |
2665 | ||
2666 | /* | |
2667 | * descend down to leftmost child page | |
2668 | */ | |
2669 | if (p->header.flag & BT_LEAF) { | |
2670 | DT_PUTPAGE(mp); | |
2671 | return -ESTALE; | |
2672 | } | |
2673 | ||
2674 | /* get the leftmost entry */ | |
2675 | stbl = DT_GETSTBL(p); | |
2676 | pxd = (pxd_t *) & p->slot[stbl[0]]; | |
2677 | ||
2678 | /* get the child page block address */ | |
2679 | bn = addressPXD(pxd); | |
2680 | psize = lengthPXD(pxd) << JFS_SBI(ip->i_sb)->l2bsize; | |
2681 | /* unpin the parent page */ | |
2682 | DT_PUTPAGE(mp); | |
2683 | } | |
2684 | ||
2685 | /* | |
2686 | * search each page at the current levevl | |
2687 | */ | |
2688 | loop: | |
2689 | stbl = DT_GETSTBL(p); | |
2690 | for (i = 0; i < p->header.nextindex; i++) { | |
2691 | pxd = (pxd_t *) & p->slot[stbl[i]]; | |
2692 | ||
2693 | /* found the specified router entry */ | |
2694 | if (addressPXD(pxd) == addressPXD(kpxd) && | |
2695 | lengthPXD(pxd) == lengthPXD(kpxd)) { | |
2696 | btsp = btstack->top; | |
2697 | btsp->bn = bn; | |
2698 | btsp->index = i; | |
2699 | btsp->mp = mp; | |
2700 | ||
2701 | return 0; | |
2702 | } | |
2703 | } | |
2704 | ||
2705 | /* get the right sibling page if any */ | |
2706 | if (p->header.next) | |
2707 | bn = le64_to_cpu(p->header.next); | |
2708 | else { | |
2709 | DT_PUTPAGE(mp); | |
2710 | return -ESTALE; | |
2711 | } | |
2712 | ||
2713 | /* unpin current page */ | |
2714 | DT_PUTPAGE(mp); | |
2715 | ||
2716 | /* get the right sibling page */ | |
2717 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
2718 | if (rc) | |
2719 | return rc; | |
2720 | ||
2721 | goto loop; | |
2722 | } | |
2723 | #endif /* _NOTYET */ | |
2724 | ||
2725 | /* | |
2726 | * dtRelink() | |
2727 | * | |
2728 | * function: | |
2729 | * link around a freed page. | |
2730 | * | |
2731 | * parameter: | |
2732 | * fp: page to be freed | |
2733 | * | |
2734 | * return: | |
2735 | */ | |
2736 | static int dtRelink(tid_t tid, struct inode *ip, dtpage_t * p) | |
2737 | { | |
2738 | int rc; | |
2739 | struct metapage *mp; | |
2740 | s64 nextbn, prevbn; | |
2741 | struct tlock *tlck; | |
2742 | struct dt_lock *dtlck; | |
2743 | struct lv *lv; | |
2744 | ||
2745 | nextbn = le64_to_cpu(p->header.next); | |
2746 | prevbn = le64_to_cpu(p->header.prev); | |
2747 | ||
2748 | /* update prev pointer of the next page */ | |
2749 | if (nextbn != 0) { | |
2750 | DT_GETPAGE(ip, nextbn, mp, PSIZE, p, rc); | |
2751 | if (rc) | |
2752 | return rc; | |
2753 | ||
2754 | BT_MARK_DIRTY(mp, ip); | |
2755 | /* | |
2756 | * acquire a transaction lock on the next page | |
2757 | * | |
2758 | * action: update prev pointer; | |
2759 | */ | |
2760 | tlck = txLock(tid, ip, mp, tlckDTREE | tlckRELINK); | |
2761 | jfs_info("dtRelink nextbn: tlck = 0x%p, ip = 0x%p, mp=0x%p", | |
2762 | tlck, ip, mp); | |
2763 | dtlck = (struct dt_lock *) & tlck->lock; | |
2764 | ||
2765 | /* linelock header */ | |
2766 | if (dtlck->index >= dtlck->maxcnt) | |
2767 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
2768 | lv = & dtlck->lv[dtlck->index]; | |
2769 | lv->offset = 0; | |
2770 | lv->length = 1; | |
2771 | dtlck->index++; | |
2772 | ||
2773 | p->header.prev = cpu_to_le64(prevbn); | |
2774 | DT_PUTPAGE(mp); | |
2775 | } | |
2776 | ||
2777 | /* update next pointer of the previous page */ | |
2778 | if (prevbn != 0) { | |
2779 | DT_GETPAGE(ip, prevbn, mp, PSIZE, p, rc); | |
2780 | if (rc) | |
2781 | return rc; | |
2782 | ||
2783 | BT_MARK_DIRTY(mp, ip); | |
2784 | /* | |
2785 | * acquire a transaction lock on the prev page | |
2786 | * | |
2787 | * action: update next pointer; | |
2788 | */ | |
2789 | tlck = txLock(tid, ip, mp, tlckDTREE | tlckRELINK); | |
2790 | jfs_info("dtRelink prevbn: tlck = 0x%p, ip = 0x%p, mp=0x%p", | |
2791 | tlck, ip, mp); | |
2792 | dtlck = (struct dt_lock *) & tlck->lock; | |
2793 | ||
2794 | /* linelock header */ | |
2795 | if (dtlck->index >= dtlck->maxcnt) | |
2796 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
2797 | lv = & dtlck->lv[dtlck->index]; | |
2798 | lv->offset = 0; | |
2799 | lv->length = 1; | |
2800 | dtlck->index++; | |
2801 | ||
2802 | p->header.next = cpu_to_le64(nextbn); | |
2803 | DT_PUTPAGE(mp); | |
2804 | } | |
2805 | ||
2806 | return 0; | |
2807 | } | |
2808 | ||
2809 | ||
2810 | /* | |
2811 | * dtInitRoot() | |
2812 | * | |
2813 | * initialize directory root (inline in inode) | |
2814 | */ | |
2815 | void dtInitRoot(tid_t tid, struct inode *ip, u32 idotdot) | |
2816 | { | |
2817 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); | |
2818 | dtroot_t *p; | |
2819 | int fsi; | |
2820 | struct dtslot *f; | |
2821 | struct tlock *tlck; | |
2822 | struct dt_lock *dtlck; | |
2823 | struct lv *lv; | |
2824 | u16 xflag_save; | |
2825 | ||
2826 | /* | |
2827 | * If this was previously an non-empty directory, we need to remove | |
2828 | * the old directory table. | |
2829 | */ | |
2830 | if (DO_INDEX(ip)) { | |
2831 | if (!jfs_dirtable_inline(ip)) { | |
2832 | struct tblock *tblk = tid_to_tblock(tid); | |
2833 | /* | |
2834 | * We're playing games with the tid's xflag. If | |
2835 | * we're removing a regular file, the file's xtree | |
2836 | * is committed with COMMIT_PMAP, but we always | |
2837 | * commit the directories xtree with COMMIT_PWMAP. | |
2838 | */ | |
2839 | xflag_save = tblk->xflag; | |
2840 | tblk->xflag = 0; | |
2841 | /* | |
2842 | * xtTruncate isn't guaranteed to fully truncate | |
2843 | * the xtree. The caller needs to check i_size | |
2844 | * after committing the transaction to see if | |
2845 | * additional truncation is needed. The | |
2846 | * COMMIT_Stale flag tells caller that we | |
2847 | * initiated the truncation. | |
2848 | */ | |
2849 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
2850 | set_cflag(COMMIT_Stale, ip); | |
2851 | ||
2852 | tblk->xflag = xflag_save; | |
2853 | } else | |
2854 | ip->i_size = 1; | |
2855 | ||
2856 | jfs_ip->next_index = 2; | |
2857 | } else | |
2858 | ip->i_size = IDATASIZE; | |
2859 | ||
2860 | /* | |
2861 | * acquire a transaction lock on the root | |
2862 | * | |
2863 | * action: directory initialization; | |
2864 | */ | |
2865 | tlck = txLock(tid, ip, (struct metapage *) & jfs_ip->bxflag, | |
2866 | tlckDTREE | tlckENTRY | tlckBTROOT); | |
2867 | dtlck = (struct dt_lock *) & tlck->lock; | |
2868 | ||
2869 | /* linelock root */ | |
2870 | ASSERT(dtlck->index == 0); | |
2871 | lv = & dtlck->lv[0]; | |
2872 | lv->offset = 0; | |
2873 | lv->length = DTROOTMAXSLOT; | |
2874 | dtlck->index++; | |
2875 | ||
2876 | p = &jfs_ip->i_dtroot; | |
2877 | ||
2878 | p->header.flag = DXD_INDEX | BT_ROOT | BT_LEAF; | |
2879 | ||
2880 | p->header.nextindex = 0; | |
2881 | ||
2882 | /* init freelist */ | |
2883 | fsi = 1; | |
2884 | f = &p->slot[fsi]; | |
2885 | ||
2886 | /* init data area of root */ | |
2887 | for (fsi++; fsi < DTROOTMAXSLOT; f++, fsi++) | |
2888 | f->next = fsi; | |
2889 | f->next = -1; | |
2890 | ||
2891 | p->header.freelist = 1; | |
2892 | p->header.freecnt = 8; | |
2893 | ||
2894 | /* init '..' entry */ | |
2895 | p->header.idotdot = cpu_to_le32(idotdot); | |
2896 | ||
2897 | return; | |
2898 | } | |
2899 | ||
2900 | /* | |
2901 | * add_missing_indices() | |
2902 | * | |
2903 | * function: Fix dtree page in which one or more entries has an invalid index. | |
2904 | * fsck.jfs should really fix this, but it currently does not. | |
2905 | * Called from jfs_readdir when bad index is detected. | |
2906 | */ | |
2907 | static void add_missing_indices(struct inode *inode, s64 bn) | |
2908 | { | |
2909 | struct ldtentry *d; | |
2910 | struct dt_lock *dtlck; | |
2911 | int i; | |
2912 | uint index; | |
2913 | struct lv *lv; | |
2914 | struct metapage *mp; | |
2915 | dtpage_t *p; | |
2916 | int rc; | |
2917 | s8 *stbl; | |
2918 | tid_t tid; | |
2919 | struct tlock *tlck; | |
2920 | ||
2921 | tid = txBegin(inode->i_sb, 0); | |
2922 | ||
2923 | DT_GETPAGE(inode, bn, mp, PSIZE, p, rc); | |
2924 | ||
2925 | if (rc) { | |
2926 | printk(KERN_ERR "DT_GETPAGE failed!\n"); | |
2927 | goto end; | |
2928 | } | |
2929 | BT_MARK_DIRTY(mp, inode); | |
2930 | ||
2931 | ASSERT(p->header.flag & BT_LEAF); | |
2932 | ||
2933 | tlck = txLock(tid, inode, mp, tlckDTREE | tlckENTRY); | |
2934 | dtlck = (struct dt_lock *) &tlck->lock; | |
2935 | ||
2936 | stbl = DT_GETSTBL(p); | |
2937 | for (i = 0; i < p->header.nextindex; i++) { | |
2938 | d = (struct ldtentry *) &p->slot[stbl[i]]; | |
2939 | index = le32_to_cpu(d->index); | |
2940 | if ((index < 2) || (index >= JFS_IP(inode)->next_index)) { | |
2941 | d->index = cpu_to_le32(add_index(tid, inode, bn, i)); | |
2942 | if (dtlck->index >= dtlck->maxcnt) | |
2943 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
2944 | lv = &dtlck->lv[dtlck->index]; | |
2945 | lv->offset = stbl[i]; | |
2946 | lv->length = 1; | |
2947 | dtlck->index++; | |
2948 | } | |
2949 | } | |
2950 | ||
2951 | DT_PUTPAGE(mp); | |
2952 | (void) txCommit(tid, 1, &inode, 0); | |
2953 | end: | |
2954 | txEnd(tid); | |
2955 | } | |
2956 | ||
2957 | /* | |
2958 | * Buffer to hold directory entry info while traversing a dtree page | |
2959 | * before being fed to the filldir function | |
2960 | */ | |
2961 | struct jfs_dirent { | |
2962 | loff_t position; | |
2963 | int ino; | |
2964 | u16 name_len; | |
2965 | char name[0]; | |
2966 | }; | |
2967 | ||
2968 | /* | |
2969 | * function to determine next variable-sized jfs_dirent in buffer | |
2970 | */ | |
2971 | static inline struct jfs_dirent *next_jfs_dirent(struct jfs_dirent *dirent) | |
2972 | { | |
2973 | return (struct jfs_dirent *) | |
2974 | ((char *)dirent + | |
2975 | ((sizeof (struct jfs_dirent) + dirent->name_len + 1 + | |
2976 | sizeof (loff_t) - 1) & | |
2977 | ~(sizeof (loff_t) - 1))); | |
2978 | } | |
2979 | ||
2980 | /* | |
2981 | * jfs_readdir() | |
2982 | * | |
2983 | * function: read directory entries sequentially | |
2984 | * from the specified entry offset | |
2985 | * | |
2986 | * parameter: | |
2987 | * | |
2988 | * return: offset = (pn, index) of start entry | |
2989 | * of next jfs_readdir()/dtRead() | |
2990 | */ | |
2991 | int jfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
2992 | { | |
2993 | struct inode *ip = filp->f_dentry->d_inode; | |
2994 | struct nls_table *codepage = JFS_SBI(ip->i_sb)->nls_tab; | |
2995 | int rc = 0; | |
2996 | loff_t dtpos; /* legacy OS/2 style position */ | |
2997 | struct dtoffset { | |
2998 | s16 pn; | |
2999 | s16 index; | |
3000 | s32 unused; | |
3001 | } *dtoffset = (struct dtoffset *) &dtpos; | |
3002 | s64 bn; | |
3003 | struct metapage *mp; | |
3004 | dtpage_t *p; | |
3005 | int index; | |
3006 | s8 *stbl; | |
3007 | struct btstack btstack; | |
3008 | int i, next; | |
3009 | struct ldtentry *d; | |
3010 | struct dtslot *t; | |
3011 | int d_namleft, len, outlen; | |
3012 | unsigned long dirent_buf; | |
3013 | char *name_ptr; | |
3014 | u32 dir_index; | |
3015 | int do_index = 0; | |
3016 | uint loop_count = 0; | |
3017 | struct jfs_dirent *jfs_dirent; | |
3018 | int jfs_dirents; | |
3019 | int overflow, fix_page, page_fixed = 0; | |
3020 | static int unique_pos = 2; /* If we can't fix broken index */ | |
3021 | ||
3022 | if (filp->f_pos == DIREND) | |
3023 | return 0; | |
3024 | ||
3025 | if (DO_INDEX(ip)) { | |
3026 | /* | |
3027 | * persistent index is stored in directory entries. | |
3028 | * Special cases: 0 = . | |
3029 | * 1 = .. | |
3030 | * -1 = End of directory | |
3031 | */ | |
3032 | do_index = 1; | |
3033 | ||
3034 | dir_index = (u32) filp->f_pos; | |
3035 | ||
3036 | if (dir_index > 1) { | |
3037 | struct dir_table_slot dirtab_slot; | |
3038 | ||
3039 | if (dtEmpty(ip) || | |
3040 | (dir_index >= JFS_IP(ip)->next_index)) { | |
3041 | /* Stale position. Directory has shrunk */ | |
3042 | filp->f_pos = DIREND; | |
3043 | return 0; | |
3044 | } | |
3045 | repeat: | |
3046 | rc = read_index(ip, dir_index, &dirtab_slot); | |
3047 | if (rc) { | |
3048 | filp->f_pos = DIREND; | |
3049 | return rc; | |
3050 | } | |
3051 | if (dirtab_slot.flag == DIR_INDEX_FREE) { | |
3052 | if (loop_count++ > JFS_IP(ip)->next_index) { | |
3053 | jfs_err("jfs_readdir detected " | |
3054 | "infinite loop!"); | |
3055 | filp->f_pos = DIREND; | |
3056 | return 0; | |
3057 | } | |
3058 | dir_index = le32_to_cpu(dirtab_slot.addr2); | |
3059 | if (dir_index == -1) { | |
3060 | filp->f_pos = DIREND; | |
3061 | return 0; | |
3062 | } | |
3063 | goto repeat; | |
3064 | } | |
3065 | bn = addressDTS(&dirtab_slot); | |
3066 | index = dirtab_slot.slot; | |
3067 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
3068 | if (rc) { | |
3069 | filp->f_pos = DIREND; | |
3070 | return 0; | |
3071 | } | |
3072 | if (p->header.flag & BT_INTERNAL) { | |
3073 | jfs_err("jfs_readdir: bad index table"); | |
3074 | DT_PUTPAGE(mp); | |
3075 | filp->f_pos = -1; | |
3076 | return 0; | |
3077 | } | |
3078 | } else { | |
3079 | if (dir_index == 0) { | |
3080 | /* | |
3081 | * self "." | |
3082 | */ | |
3083 | filp->f_pos = 0; | |
3084 | if (filldir(dirent, ".", 1, 0, ip->i_ino, | |
3085 | DT_DIR)) | |
3086 | return 0; | |
3087 | } | |
3088 | /* | |
3089 | * parent ".." | |
3090 | */ | |
3091 | filp->f_pos = 1; | |
3092 | if (filldir(dirent, "..", 2, 1, PARENT(ip), DT_DIR)) | |
3093 | return 0; | |
3094 | ||
3095 | /* | |
3096 | * Find first entry of left-most leaf | |
3097 | */ | |
3098 | if (dtEmpty(ip)) { | |
3099 | filp->f_pos = DIREND; | |
3100 | return 0; | |
3101 | } | |
3102 | ||
3103 | if ((rc = dtReadFirst(ip, &btstack))) | |
3104 | return rc; | |
3105 | ||
3106 | DT_GETSEARCH(ip, btstack.top, bn, mp, p, index); | |
3107 | } | |
3108 | } else { | |
3109 | /* | |
3110 | * Legacy filesystem - OS/2 & Linux JFS < 0.3.6 | |
3111 | * | |
3112 | * pn = index = 0: First entry "." | |
3113 | * pn = 0; index = 1: Second entry ".." | |
3114 | * pn > 0: Real entries, pn=1 -> leftmost page | |
3115 | * pn = index = -1: No more entries | |
3116 | */ | |
3117 | dtpos = filp->f_pos; | |
3118 | if (dtpos == 0) { | |
3119 | /* build "." entry */ | |
3120 | ||
3121 | if (filldir(dirent, ".", 1, filp->f_pos, ip->i_ino, | |
3122 | DT_DIR)) | |
3123 | return 0; | |
3124 | dtoffset->index = 1; | |
3125 | filp->f_pos = dtpos; | |
3126 | } | |
3127 | ||
3128 | if (dtoffset->pn == 0) { | |
3129 | if (dtoffset->index == 1) { | |
3130 | /* build ".." entry */ | |
3131 | ||
3132 | if (filldir(dirent, "..", 2, filp->f_pos, | |
3133 | PARENT(ip), DT_DIR)) | |
3134 | return 0; | |
3135 | } else { | |
3136 | jfs_err("jfs_readdir called with " | |
3137 | "invalid offset!"); | |
3138 | } | |
3139 | dtoffset->pn = 1; | |
3140 | dtoffset->index = 0; | |
3141 | filp->f_pos = dtpos; | |
3142 | } | |
3143 | ||
3144 | if (dtEmpty(ip)) { | |
3145 | filp->f_pos = DIREND; | |
3146 | return 0; | |
3147 | } | |
3148 | ||
3149 | if ((rc = dtReadNext(ip, &filp->f_pos, &btstack))) { | |
3150 | jfs_err("jfs_readdir: unexpected rc = %d " | |
3151 | "from dtReadNext", rc); | |
3152 | filp->f_pos = DIREND; | |
3153 | return 0; | |
3154 | } | |
3155 | /* get start leaf page and index */ | |
3156 | DT_GETSEARCH(ip, btstack.top, bn, mp, p, index); | |
3157 | ||
3158 | /* offset beyond directory eof ? */ | |
3159 | if (bn < 0) { | |
3160 | filp->f_pos = DIREND; | |
3161 | return 0; | |
3162 | } | |
3163 | } | |
3164 | ||
3165 | dirent_buf = __get_free_page(GFP_KERNEL); | |
3166 | if (dirent_buf == 0) { | |
3167 | DT_PUTPAGE(mp); | |
3168 | jfs_warn("jfs_readdir: __get_free_page failed!"); | |
3169 | filp->f_pos = DIREND; | |
3170 | return -ENOMEM; | |
3171 | } | |
3172 | ||
3173 | while (1) { | |
3174 | jfs_dirent = (struct jfs_dirent *) dirent_buf; | |
3175 | jfs_dirents = 0; | |
3176 | overflow = fix_page = 0; | |
3177 | ||
3178 | stbl = DT_GETSTBL(p); | |
3179 | ||
3180 | for (i = index; i < p->header.nextindex; i++) { | |
3181 | d = (struct ldtentry *) & p->slot[stbl[i]]; | |
3182 | ||
3183 | if (((long) jfs_dirent + d->namlen + 1) > | |
3184 | (dirent_buf + PSIZE)) { | |
3185 | /* DBCS codepages could overrun dirent_buf */ | |
3186 | index = i; | |
3187 | overflow = 1; | |
3188 | break; | |
3189 | } | |
3190 | ||
3191 | d_namleft = d->namlen; | |
3192 | name_ptr = jfs_dirent->name; | |
3193 | jfs_dirent->ino = le32_to_cpu(d->inumber); | |
3194 | ||
3195 | if (do_index) { | |
3196 | len = min(d_namleft, DTLHDRDATALEN); | |
3197 | jfs_dirent->position = le32_to_cpu(d->index); | |
3198 | /* | |
3199 | * d->index should always be valid, but it | |
3200 | * isn't. fsck.jfs doesn't create the | |
3201 | * directory index for the lost+found | |
3202 | * directory. Rather than let it go, | |
3203 | * we can try to fix it. | |
3204 | */ | |
3205 | if ((jfs_dirent->position < 2) || | |
3206 | (jfs_dirent->position >= | |
3207 | JFS_IP(ip)->next_index)) { | |
3208 | if (!page_fixed && !isReadOnly(ip)) { | |
3209 | fix_page = 1; | |
3210 | /* | |
3211 | * setting overflow and setting | |
3212 | * index to i will cause the | |
3213 | * same page to be processed | |
3214 | * again starting here | |
3215 | */ | |
3216 | overflow = 1; | |
3217 | index = i; | |
3218 | break; | |
3219 | } | |
3220 | jfs_dirent->position = unique_pos++; | |
3221 | } | |
3222 | } else { | |
3223 | jfs_dirent->position = dtpos; | |
3224 | len = min(d_namleft, DTLHDRDATALEN_LEGACY); | |
3225 | } | |
3226 | ||
3227 | /* copy the name of head/only segment */ | |
3228 | outlen = jfs_strfromUCS_le(name_ptr, d->name, len, | |
3229 | codepage); | |
3230 | jfs_dirent->name_len = outlen; | |
3231 | ||
3232 | /* copy name in the additional segment(s) */ | |
3233 | next = d->next; | |
3234 | while (next >= 0) { | |
3235 | t = (struct dtslot *) & p->slot[next]; | |
3236 | name_ptr += outlen; | |
3237 | d_namleft -= len; | |
3238 | /* Sanity Check */ | |
3239 | if (d_namleft == 0) { | |
3240 | jfs_error(ip->i_sb, | |
3241 | "JFS:Dtree error: ino = " | |
3242 | "%ld, bn=%Ld, index = %d", | |
3243 | (long)ip->i_ino, | |
3244 | (long long)bn, | |
3245 | i); | |
3246 | goto skip_one; | |
3247 | } | |
3248 | len = min(d_namleft, DTSLOTDATALEN); | |
3249 | outlen = jfs_strfromUCS_le(name_ptr, t->name, | |
3250 | len, codepage); | |
3251 | jfs_dirent->name_len += outlen; | |
3252 | ||
3253 | next = t->next; | |
3254 | } | |
3255 | ||
3256 | jfs_dirents++; | |
3257 | jfs_dirent = next_jfs_dirent(jfs_dirent); | |
3258 | skip_one: | |
3259 | if (!do_index) | |
3260 | dtoffset->index++; | |
3261 | } | |
3262 | ||
3263 | if (!overflow) { | |
3264 | /* Point to next leaf page */ | |
3265 | if (p->header.flag & BT_ROOT) | |
3266 | bn = 0; | |
3267 | else { | |
3268 | bn = le64_to_cpu(p->header.next); | |
3269 | index = 0; | |
3270 | /* update offset (pn:index) for new page */ | |
3271 | if (!do_index) { | |
3272 | dtoffset->pn++; | |
3273 | dtoffset->index = 0; | |
3274 | } | |
3275 | } | |
3276 | page_fixed = 0; | |
3277 | } | |
3278 | ||
3279 | /* unpin previous leaf page */ | |
3280 | DT_PUTPAGE(mp); | |
3281 | ||
3282 | jfs_dirent = (struct jfs_dirent *) dirent_buf; | |
3283 | while (jfs_dirents--) { | |
3284 | filp->f_pos = jfs_dirent->position; | |
3285 | if (filldir(dirent, jfs_dirent->name, | |
3286 | jfs_dirent->name_len, filp->f_pos, | |
3287 | jfs_dirent->ino, DT_UNKNOWN)) | |
3288 | goto out; | |
3289 | jfs_dirent = next_jfs_dirent(jfs_dirent); | |
3290 | } | |
3291 | ||
3292 | if (fix_page) { | |
3293 | add_missing_indices(ip, bn); | |
3294 | page_fixed = 1; | |
3295 | } | |
3296 | ||
3297 | if (!overflow && (bn == 0)) { | |
3298 | filp->f_pos = DIREND; | |
3299 | break; | |
3300 | } | |
3301 | ||
3302 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
3303 | if (rc) { | |
3304 | free_page(dirent_buf); | |
3305 | return rc; | |
3306 | } | |
3307 | } | |
3308 | ||
3309 | out: | |
3310 | free_page(dirent_buf); | |
3311 | ||
3312 | return rc; | |
3313 | } | |
3314 | ||
3315 | ||
3316 | /* | |
3317 | * dtReadFirst() | |
3318 | * | |
3319 | * function: get the leftmost page of the directory | |
3320 | */ | |
3321 | static int dtReadFirst(struct inode *ip, struct btstack * btstack) | |
3322 | { | |
3323 | int rc = 0; | |
3324 | s64 bn; | |
3325 | int psize = 288; /* initial in-line directory */ | |
3326 | struct metapage *mp; | |
3327 | dtpage_t *p; | |
3328 | s8 *stbl; | |
3329 | struct btframe *btsp; | |
3330 | pxd_t *xd; | |
3331 | ||
3332 | BT_CLR(btstack); /* reset stack */ | |
3333 | ||
3334 | /* | |
3335 | * descend leftmost path of the tree | |
3336 | * | |
3337 | * by convention, root bn = 0. | |
3338 | */ | |
3339 | for (bn = 0;;) { | |
3340 | DT_GETPAGE(ip, bn, mp, psize, p, rc); | |
3341 | if (rc) | |
3342 | return rc; | |
3343 | ||
3344 | /* | |
3345 | * leftmost leaf page | |
3346 | */ | |
3347 | if (p->header.flag & BT_LEAF) { | |
3348 | /* return leftmost entry */ | |
3349 | btsp = btstack->top; | |
3350 | btsp->bn = bn; | |
3351 | btsp->index = 0; | |
3352 | btsp->mp = mp; | |
3353 | ||
3354 | return 0; | |
3355 | } | |
3356 | ||
3357 | /* | |
3358 | * descend down to leftmost child page | |
3359 | */ | |
3360 | if (BT_STACK_FULL(btstack)) { | |
3361 | DT_PUTPAGE(mp); | |
3362 | jfs_error(ip->i_sb, "dtReadFirst: btstack overrun"); | |
3363 | BT_STACK_DUMP(btstack); | |
3364 | return -EIO; | |
3365 | } | |
3366 | /* push (bn, index) of the parent page/entry */ | |
3367 | BT_PUSH(btstack, bn, 0); | |
3368 | ||
3369 | /* get the leftmost entry */ | |
3370 | stbl = DT_GETSTBL(p); | |
3371 | xd = (pxd_t *) & p->slot[stbl[0]]; | |
3372 | ||
3373 | /* get the child page block address */ | |
3374 | bn = addressPXD(xd); | |
3375 | psize = lengthPXD(xd) << JFS_SBI(ip->i_sb)->l2bsize; | |
3376 | ||
3377 | /* unpin the parent page */ | |
3378 | DT_PUTPAGE(mp); | |
3379 | } | |
3380 | } | |
3381 | ||
3382 | ||
3383 | /* | |
3384 | * dtReadNext() | |
3385 | * | |
3386 | * function: get the page of the specified offset (pn:index) | |
3387 | * | |
3388 | * return: if (offset > eof), bn = -1; | |
3389 | * | |
3390 | * note: if index > nextindex of the target leaf page, | |
3391 | * start with 1st entry of next leaf page; | |
3392 | */ | |
3393 | static int dtReadNext(struct inode *ip, loff_t * offset, | |
3394 | struct btstack * btstack) | |
3395 | { | |
3396 | int rc = 0; | |
3397 | struct dtoffset { | |
3398 | s16 pn; | |
3399 | s16 index; | |
3400 | s32 unused; | |
3401 | } *dtoffset = (struct dtoffset *) offset; | |
3402 | s64 bn; | |
3403 | struct metapage *mp; | |
3404 | dtpage_t *p; | |
3405 | int index; | |
3406 | int pn; | |
3407 | s8 *stbl; | |
3408 | struct btframe *btsp, *parent; | |
3409 | pxd_t *xd; | |
3410 | ||
3411 | /* | |
3412 | * get leftmost leaf page pinned | |
3413 | */ | |
3414 | if ((rc = dtReadFirst(ip, btstack))) | |
3415 | return rc; | |
3416 | ||
3417 | /* get leaf page */ | |
3418 | DT_GETSEARCH(ip, btstack->top, bn, mp, p, index); | |
3419 | ||
3420 | /* get the start offset (pn:index) */ | |
3421 | pn = dtoffset->pn - 1; /* Now pn = 0 represents leftmost leaf */ | |
3422 | index = dtoffset->index; | |
3423 | ||
3424 | /* start at leftmost page ? */ | |
3425 | if (pn == 0) { | |
3426 | /* offset beyond eof ? */ | |
3427 | if (index < p->header.nextindex) | |
3428 | goto out; | |
3429 | ||
3430 | if (p->header.flag & BT_ROOT) { | |
3431 | bn = -1; | |
3432 | goto out; | |
3433 | } | |
3434 | ||
3435 | /* start with 1st entry of next leaf page */ | |
3436 | dtoffset->pn++; | |
3437 | dtoffset->index = index = 0; | |
3438 | goto a; | |
3439 | } | |
3440 | ||
3441 | /* start at non-leftmost page: scan parent pages for large pn */ | |
3442 | if (p->header.flag & BT_ROOT) { | |
3443 | bn = -1; | |
3444 | goto out; | |
3445 | } | |
3446 | ||
3447 | /* start after next leaf page ? */ | |
3448 | if (pn > 1) | |
3449 | goto b; | |
3450 | ||
3451 | /* get leaf page pn = 1 */ | |
3452 | a: | |
3453 | bn = le64_to_cpu(p->header.next); | |
3454 | ||
3455 | /* unpin leaf page */ | |
3456 | DT_PUTPAGE(mp); | |
3457 | ||
3458 | /* offset beyond eof ? */ | |
3459 | if (bn == 0) { | |
3460 | bn = -1; | |
3461 | goto out; | |
3462 | } | |
3463 | ||
3464 | goto c; | |
3465 | ||
3466 | /* | |
3467 | * scan last internal page level to get target leaf page | |
3468 | */ | |
3469 | b: | |
3470 | /* unpin leftmost leaf page */ | |
3471 | DT_PUTPAGE(mp); | |
3472 | ||
3473 | /* get left most parent page */ | |
3474 | btsp = btstack->top; | |
3475 | parent = btsp - 1; | |
3476 | bn = parent->bn; | |
3477 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
3478 | if (rc) | |
3479 | return rc; | |
3480 | ||
3481 | /* scan parent pages at last internal page level */ | |
3482 | while (pn >= p->header.nextindex) { | |
3483 | pn -= p->header.nextindex; | |
3484 | ||
3485 | /* get next parent page address */ | |
3486 | bn = le64_to_cpu(p->header.next); | |
3487 | ||
3488 | /* unpin current parent page */ | |
3489 | DT_PUTPAGE(mp); | |
3490 | ||
3491 | /* offset beyond eof ? */ | |
3492 | if (bn == 0) { | |
3493 | bn = -1; | |
3494 | goto out; | |
3495 | } | |
3496 | ||
3497 | /* get next parent page */ | |
3498 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
3499 | if (rc) | |
3500 | return rc; | |
3501 | ||
3502 | /* update parent page stack frame */ | |
3503 | parent->bn = bn; | |
3504 | } | |
3505 | ||
3506 | /* get leaf page address */ | |
3507 | stbl = DT_GETSTBL(p); | |
3508 | xd = (pxd_t *) & p->slot[stbl[pn]]; | |
3509 | bn = addressPXD(xd); | |
3510 | ||
3511 | /* unpin parent page */ | |
3512 | DT_PUTPAGE(mp); | |
3513 | ||
3514 | /* | |
3515 | * get target leaf page | |
3516 | */ | |
3517 | c: | |
3518 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
3519 | if (rc) | |
3520 | return rc; | |
3521 | ||
3522 | /* | |
3523 | * leaf page has been completed: | |
3524 | * start with 1st entry of next leaf page | |
3525 | */ | |
3526 | if (index >= p->header.nextindex) { | |
3527 | bn = le64_to_cpu(p->header.next); | |
3528 | ||
3529 | /* unpin leaf page */ | |
3530 | DT_PUTPAGE(mp); | |
3531 | ||
3532 | /* offset beyond eof ? */ | |
3533 | if (bn == 0) { | |
3534 | bn = -1; | |
3535 | goto out; | |
3536 | } | |
3537 | ||
3538 | /* get next leaf page */ | |
3539 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
3540 | if (rc) | |
3541 | return rc; | |
3542 | ||
3543 | /* start with 1st entry of next leaf page */ | |
3544 | dtoffset->pn++; | |
3545 | dtoffset->index = 0; | |
3546 | } | |
3547 | ||
3548 | out: | |
3549 | /* return target leaf page pinned */ | |
3550 | btsp = btstack->top; | |
3551 | btsp->bn = bn; | |
3552 | btsp->index = dtoffset->index; | |
3553 | btsp->mp = mp; | |
3554 | ||
3555 | return 0; | |
3556 | } | |
3557 | ||
3558 | ||
3559 | /* | |
3560 | * dtCompare() | |
3561 | * | |
3562 | * function: compare search key with an internal entry | |
3563 | * | |
3564 | * return: | |
3565 | * < 0 if k is < record | |
3566 | * = 0 if k is = record | |
3567 | * > 0 if k is > record | |
3568 | */ | |
3569 | static int dtCompare(struct component_name * key, /* search key */ | |
3570 | dtpage_t * p, /* directory page */ | |
3571 | int si) | |
3572 | { /* entry slot index */ | |
3573 | wchar_t *kname; | |
3574 | __le16 *name; | |
3575 | int klen, namlen, len, rc; | |
3576 | struct idtentry *ih; | |
3577 | struct dtslot *t; | |
3578 | ||
3579 | /* | |
3580 | * force the left-most key on internal pages, at any level of | |
3581 | * the tree, to be less than any search key. | |
3582 | * this obviates having to update the leftmost key on an internal | |
3583 | * page when the user inserts a new key in the tree smaller than | |
3584 | * anything that has been stored. | |
3585 | * | |
3586 | * (? if/when dtSearch() narrows down to 1st entry (index = 0), | |
3587 | * at any internal page at any level of the tree, | |
3588 | * it descends to child of the entry anyway - | |
3589 | * ? make the entry as min size dummy entry) | |
3590 | * | |
3591 | * if (e->index == 0 && h->prevpg == P_INVALID && !(h->flags & BT_LEAF)) | |
3592 | * return (1); | |
3593 | */ | |
3594 | ||
3595 | kname = key->name; | |
3596 | klen = key->namlen; | |
3597 | ||
3598 | ih = (struct idtentry *) & p->slot[si]; | |
3599 | si = ih->next; | |
3600 | name = ih->name; | |
3601 | namlen = ih->namlen; | |
3602 | len = min(namlen, DTIHDRDATALEN); | |
3603 | ||
3604 | /* compare with head/only segment */ | |
3605 | len = min(klen, len); | |
3606 | if ((rc = UniStrncmp_le(kname, name, len))) | |
3607 | return rc; | |
3608 | ||
3609 | klen -= len; | |
3610 | namlen -= len; | |
3611 | ||
3612 | /* compare with additional segment(s) */ | |
3613 | kname += len; | |
3614 | while (klen > 0 && namlen > 0) { | |
3615 | /* compare with next name segment */ | |
3616 | t = (struct dtslot *) & p->slot[si]; | |
3617 | len = min(namlen, DTSLOTDATALEN); | |
3618 | len = min(klen, len); | |
3619 | name = t->name; | |
3620 | if ((rc = UniStrncmp_le(kname, name, len))) | |
3621 | return rc; | |
3622 | ||
3623 | klen -= len; | |
3624 | namlen -= len; | |
3625 | kname += len; | |
3626 | si = t->next; | |
3627 | } | |
3628 | ||
3629 | return (klen - namlen); | |
3630 | } | |
3631 | ||
3632 | ||
3633 | ||
3634 | ||
3635 | /* | |
3636 | * ciCompare() | |
3637 | * | |
3638 | * function: compare search key with an (leaf/internal) entry | |
3639 | * | |
3640 | * return: | |
3641 | * < 0 if k is < record | |
3642 | * = 0 if k is = record | |
3643 | * > 0 if k is > record | |
3644 | */ | |
3645 | static int ciCompare(struct component_name * key, /* search key */ | |
3646 | dtpage_t * p, /* directory page */ | |
3647 | int si, /* entry slot index */ | |
3648 | int flag) | |
3649 | { | |
3650 | wchar_t *kname, x; | |
3651 | __le16 *name; | |
3652 | int klen, namlen, len, rc; | |
3653 | struct ldtentry *lh; | |
3654 | struct idtentry *ih; | |
3655 | struct dtslot *t; | |
3656 | int i; | |
3657 | ||
3658 | /* | |
3659 | * force the left-most key on internal pages, at any level of | |
3660 | * the tree, to be less than any search key. | |
3661 | * this obviates having to update the leftmost key on an internal | |
3662 | * page when the user inserts a new key in the tree smaller than | |
3663 | * anything that has been stored. | |
3664 | * | |
3665 | * (? if/when dtSearch() narrows down to 1st entry (index = 0), | |
3666 | * at any internal page at any level of the tree, | |
3667 | * it descends to child of the entry anyway - | |
3668 | * ? make the entry as min size dummy entry) | |
3669 | * | |
3670 | * if (e->index == 0 && h->prevpg == P_INVALID && !(h->flags & BT_LEAF)) | |
3671 | * return (1); | |
3672 | */ | |
3673 | ||
3674 | kname = key->name; | |
3675 | klen = key->namlen; | |
3676 | ||
3677 | /* | |
3678 | * leaf page entry | |
3679 | */ | |
3680 | if (p->header.flag & BT_LEAF) { | |
3681 | lh = (struct ldtentry *) & p->slot[si]; | |
3682 | si = lh->next; | |
3683 | name = lh->name; | |
3684 | namlen = lh->namlen; | |
3685 | if (flag & JFS_DIR_INDEX) | |
3686 | len = min(namlen, DTLHDRDATALEN); | |
3687 | else | |
3688 | len = min(namlen, DTLHDRDATALEN_LEGACY); | |
3689 | } | |
3690 | /* | |
3691 | * internal page entry | |
3692 | */ | |
3693 | else { | |
3694 | ih = (struct idtentry *) & p->slot[si]; | |
3695 | si = ih->next; | |
3696 | name = ih->name; | |
3697 | namlen = ih->namlen; | |
3698 | len = min(namlen, DTIHDRDATALEN); | |
3699 | } | |
3700 | ||
3701 | /* compare with head/only segment */ | |
3702 | len = min(klen, len); | |
3703 | for (i = 0; i < len; i++, kname++, name++) { | |
3704 | /* only uppercase if case-insensitive support is on */ | |
3705 | if ((flag & JFS_OS2) == JFS_OS2) | |
3706 | x = UniToupper(le16_to_cpu(*name)); | |
3707 | else | |
3708 | x = le16_to_cpu(*name); | |
3709 | if ((rc = *kname - x)) | |
3710 | return rc; | |
3711 | } | |
3712 | ||
3713 | klen -= len; | |
3714 | namlen -= len; | |
3715 | ||
3716 | /* compare with additional segment(s) */ | |
3717 | while (klen > 0 && namlen > 0) { | |
3718 | /* compare with next name segment */ | |
3719 | t = (struct dtslot *) & p->slot[si]; | |
3720 | len = min(namlen, DTSLOTDATALEN); | |
3721 | len = min(klen, len); | |
3722 | name = t->name; | |
3723 | for (i = 0; i < len; i++, kname++, name++) { | |
3724 | /* only uppercase if case-insensitive support is on */ | |
3725 | if ((flag & JFS_OS2) == JFS_OS2) | |
3726 | x = UniToupper(le16_to_cpu(*name)); | |
3727 | else | |
3728 | x = le16_to_cpu(*name); | |
3729 | ||
3730 | if ((rc = *kname - x)) | |
3731 | return rc; | |
3732 | } | |
3733 | ||
3734 | klen -= len; | |
3735 | namlen -= len; | |
3736 | si = t->next; | |
3737 | } | |
3738 | ||
3739 | return (klen - namlen); | |
3740 | } | |
3741 | ||
3742 | ||
3743 | /* | |
3744 | * ciGetLeafPrefixKey() | |
3745 | * | |
3746 | * function: compute prefix of suffix compression | |
3747 | * from two adjacent leaf entries | |
3748 | * across page boundary | |
3749 | * | |
3750 | * return: non-zero on error | |
3751 | * | |
3752 | */ | |
3753 | static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp, | |
3754 | int ri, struct component_name * key, int flag) | |
3755 | { | |
3756 | int klen, namlen; | |
3757 | wchar_t *pl, *pr, *kname; | |
3758 | struct component_name lkey; | |
3759 | struct component_name rkey; | |
3760 | ||
3761 | lkey.name = (wchar_t *) kmalloc((JFS_NAME_MAX + 1) * sizeof(wchar_t), | |
3762 | GFP_KERNEL); | |
3763 | if (lkey.name == NULL) | |
3764 | return -ENOSPC; | |
3765 | ||
3766 | rkey.name = (wchar_t *) kmalloc((JFS_NAME_MAX + 1) * sizeof(wchar_t), | |
3767 | GFP_KERNEL); | |
3768 | if (rkey.name == NULL) { | |
3769 | kfree(lkey.name); | |
3770 | return -ENOSPC; | |
3771 | } | |
3772 | ||
3773 | /* get left and right key */ | |
3774 | dtGetKey(lp, li, &lkey, flag); | |
3775 | lkey.name[lkey.namlen] = 0; | |
3776 | ||
3777 | if ((flag & JFS_OS2) == JFS_OS2) | |
3778 | ciToUpper(&lkey); | |
3779 | ||
3780 | dtGetKey(rp, ri, &rkey, flag); | |
3781 | rkey.name[rkey.namlen] = 0; | |
3782 | ||
3783 | ||
3784 | if ((flag & JFS_OS2) == JFS_OS2) | |
3785 | ciToUpper(&rkey); | |
3786 | ||
3787 | /* compute prefix */ | |
3788 | klen = 0; | |
3789 | kname = key->name; | |
3790 | namlen = min(lkey.namlen, rkey.namlen); | |
3791 | for (pl = lkey.name, pr = rkey.name; | |
3792 | namlen; pl++, pr++, namlen--, klen++, kname++) { | |
3793 | *kname = *pr; | |
3794 | if (*pl != *pr) { | |
3795 | key->namlen = klen + 1; | |
3796 | goto free_names; | |
3797 | } | |
3798 | } | |
3799 | ||
3800 | /* l->namlen <= r->namlen since l <= r */ | |
3801 | if (lkey.namlen < rkey.namlen) { | |
3802 | *kname = *pr; | |
3803 | key->namlen = klen + 1; | |
3804 | } else /* l->namelen == r->namelen */ | |
3805 | key->namlen = klen; | |
3806 | ||
3807 | free_names: | |
3808 | kfree(lkey.name); | |
3809 | kfree(rkey.name); | |
3810 | return 0; | |
3811 | } | |
3812 | ||
3813 | ||
3814 | ||
3815 | /* | |
3816 | * dtGetKey() | |
3817 | * | |
3818 | * function: get key of the entry | |
3819 | */ | |
3820 | static void dtGetKey(dtpage_t * p, int i, /* entry index */ | |
3821 | struct component_name * key, int flag) | |
3822 | { | |
3823 | int si; | |
3824 | s8 *stbl; | |
3825 | struct ldtentry *lh; | |
3826 | struct idtentry *ih; | |
3827 | struct dtslot *t; | |
3828 | int namlen, len; | |
3829 | wchar_t *kname; | |
3830 | __le16 *name; | |
3831 | ||
3832 | /* get entry */ | |
3833 | stbl = DT_GETSTBL(p); | |
3834 | si = stbl[i]; | |
3835 | if (p->header.flag & BT_LEAF) { | |
3836 | lh = (struct ldtentry *) & p->slot[si]; | |
3837 | si = lh->next; | |
3838 | namlen = lh->namlen; | |
3839 | name = lh->name; | |
3840 | if (flag & JFS_DIR_INDEX) | |
3841 | len = min(namlen, DTLHDRDATALEN); | |
3842 | else | |
3843 | len = min(namlen, DTLHDRDATALEN_LEGACY); | |
3844 | } else { | |
3845 | ih = (struct idtentry *) & p->slot[si]; | |
3846 | si = ih->next; | |
3847 | namlen = ih->namlen; | |
3848 | name = ih->name; | |
3849 | len = min(namlen, DTIHDRDATALEN); | |
3850 | } | |
3851 | ||
3852 | key->namlen = namlen; | |
3853 | kname = key->name; | |
3854 | ||
3855 | /* | |
3856 | * move head/only segment | |
3857 | */ | |
3858 | UniStrncpy_from_le(kname, name, len); | |
3859 | ||
3860 | /* | |
3861 | * move additional segment(s) | |
3862 | */ | |
3863 | while (si >= 0) { | |
3864 | /* get next segment */ | |
3865 | t = &p->slot[si]; | |
3866 | kname += len; | |
3867 | namlen -= len; | |
3868 | len = min(namlen, DTSLOTDATALEN); | |
3869 | UniStrncpy_from_le(kname, t->name, len); | |
3870 | ||
3871 | si = t->next; | |
3872 | } | |
3873 | } | |
3874 | ||
3875 | ||
3876 | /* | |
3877 | * dtInsertEntry() | |
3878 | * | |
3879 | * function: allocate free slot(s) and | |
3880 | * write a leaf/internal entry | |
3881 | * | |
3882 | * return: entry slot index | |
3883 | */ | |
3884 | static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key, | |
3885 | ddata_t * data, struct dt_lock ** dtlock) | |
3886 | { | |
3887 | struct dtslot *h, *t; | |
3888 | struct ldtentry *lh = NULL; | |
3889 | struct idtentry *ih = NULL; | |
3890 | int hsi, fsi, klen, len, nextindex; | |
3891 | wchar_t *kname; | |
3892 | __le16 *name; | |
3893 | s8 *stbl; | |
3894 | pxd_t *xd; | |
3895 | struct dt_lock *dtlck = *dtlock; | |
3896 | struct lv *lv; | |
3897 | int xsi, n; | |
3898 | s64 bn = 0; | |
3899 | struct metapage *mp = NULL; | |
3900 | ||
3901 | klen = key->namlen; | |
3902 | kname = key->name; | |
3903 | ||
3904 | /* allocate a free slot */ | |
3905 | hsi = fsi = p->header.freelist; | |
3906 | h = &p->slot[fsi]; | |
3907 | p->header.freelist = h->next; | |
3908 | --p->header.freecnt; | |
3909 | ||
3910 | /* open new linelock */ | |
3911 | if (dtlck->index >= dtlck->maxcnt) | |
3912 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
3913 | ||
3914 | lv = & dtlck->lv[dtlck->index]; | |
3915 | lv->offset = hsi; | |
3916 | ||
3917 | /* write head/only segment */ | |
3918 | if (p->header.flag & BT_LEAF) { | |
3919 | lh = (struct ldtentry *) h; | |
3920 | lh->next = h->next; | |
3921 | lh->inumber = cpu_to_le32(data->leaf.ino); | |
3922 | lh->namlen = klen; | |
3923 | name = lh->name; | |
3924 | if (data->leaf.ip) { | |
3925 | len = min(klen, DTLHDRDATALEN); | |
3926 | if (!(p->header.flag & BT_ROOT)) | |
3927 | bn = addressPXD(&p->header.self); | |
3928 | lh->index = cpu_to_le32(add_index(data->leaf.tid, | |
3929 | data->leaf.ip, | |
3930 | bn, index)); | |
3931 | } else | |
3932 | len = min(klen, DTLHDRDATALEN_LEGACY); | |
3933 | } else { | |
3934 | ih = (struct idtentry *) h; | |
3935 | ih->next = h->next; | |
3936 | xd = (pxd_t *) ih; | |
3937 | *xd = data->xd; | |
3938 | ih->namlen = klen; | |
3939 | name = ih->name; | |
3940 | len = min(klen, DTIHDRDATALEN); | |
3941 | } | |
3942 | ||
3943 | UniStrncpy_to_le(name, kname, len); | |
3944 | ||
3945 | n = 1; | |
3946 | xsi = hsi; | |
3947 | ||
3948 | /* write additional segment(s) */ | |
3949 | t = h; | |
3950 | klen -= len; | |
3951 | while (klen) { | |
3952 | /* get free slot */ | |
3953 | fsi = p->header.freelist; | |
3954 | t = &p->slot[fsi]; | |
3955 | p->header.freelist = t->next; | |
3956 | --p->header.freecnt; | |
3957 | ||
3958 | /* is next slot contiguous ? */ | |
3959 | if (fsi != xsi + 1) { | |
3960 | /* close current linelock */ | |
3961 | lv->length = n; | |
3962 | dtlck->index++; | |
3963 | ||
3964 | /* open new linelock */ | |
3965 | if (dtlck->index < dtlck->maxcnt) | |
3966 | lv++; | |
3967 | else { | |
3968 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
3969 | lv = & dtlck->lv[0]; | |
3970 | } | |
3971 | ||
3972 | lv->offset = fsi; | |
3973 | n = 0; | |
3974 | } | |
3975 | ||
3976 | kname += len; | |
3977 | len = min(klen, DTSLOTDATALEN); | |
3978 | UniStrncpy_to_le(t->name, kname, len); | |
3979 | ||
3980 | n++; | |
3981 | xsi = fsi; | |
3982 | klen -= len; | |
3983 | } | |
3984 | ||
3985 | /* close current linelock */ | |
3986 | lv->length = n; | |
3987 | dtlck->index++; | |
3988 | ||
3989 | *dtlock = dtlck; | |
3990 | ||
3991 | /* terminate last/only segment */ | |
3992 | if (h == t) { | |
3993 | /* single segment entry */ | |
3994 | if (p->header.flag & BT_LEAF) | |
3995 | lh->next = -1; | |
3996 | else | |
3997 | ih->next = -1; | |
3998 | } else | |
3999 | /* multi-segment entry */ | |
4000 | t->next = -1; | |
4001 | ||
4002 | /* if insert into middle, shift right succeeding entries in stbl */ | |
4003 | stbl = DT_GETSTBL(p); | |
4004 | nextindex = p->header.nextindex; | |
4005 | if (index < nextindex) { | |
4006 | memmove(stbl + index + 1, stbl + index, nextindex - index); | |
4007 | ||
4008 | if ((p->header.flag & BT_LEAF) && data->leaf.ip) { | |
4009 | s64 lblock; | |
4010 | ||
4011 | /* | |
4012 | * Need to update slot number for entries that moved | |
4013 | * in the stbl | |
4014 | */ | |
4015 | mp = NULL; | |
4016 | for (n = index + 1; n <= nextindex; n++) { | |
4017 | lh = (struct ldtentry *) & (p->slot[stbl[n]]); | |
4018 | modify_index(data->leaf.tid, data->leaf.ip, | |
4019 | le32_to_cpu(lh->index), bn, n, | |
4020 | &mp, &lblock); | |
4021 | } | |
4022 | if (mp) | |
4023 | release_metapage(mp); | |
4024 | } | |
4025 | } | |
4026 | ||
4027 | stbl[index] = hsi; | |
4028 | ||
4029 | /* advance next available entry index of stbl */ | |
4030 | ++p->header.nextindex; | |
4031 | } | |
4032 | ||
4033 | ||
4034 | /* | |
4035 | * dtMoveEntry() | |
4036 | * | |
4037 | * function: move entries from split/left page to new/right page | |
4038 | * | |
4039 | * nextindex of dst page and freelist/freecnt of both pages | |
4040 | * are updated. | |
4041 | */ | |
4042 | static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp, | |
4043 | struct dt_lock ** sdtlock, struct dt_lock ** ddtlock, | |
4044 | int do_index) | |
4045 | { | |
4046 | int ssi, next; /* src slot index */ | |
4047 | int di; /* dst entry index */ | |
4048 | int dsi; /* dst slot index */ | |
4049 | s8 *sstbl, *dstbl; /* sorted entry table */ | |
4050 | int snamlen, len; | |
4051 | struct ldtentry *slh, *dlh = NULL; | |
4052 | struct idtentry *sih, *dih = NULL; | |
4053 | struct dtslot *h, *s, *d; | |
4054 | struct dt_lock *sdtlck = *sdtlock, *ddtlck = *ddtlock; | |
4055 | struct lv *slv, *dlv; | |
4056 | int xssi, ns, nd; | |
4057 | int sfsi; | |
4058 | ||
4059 | sstbl = (s8 *) & sp->slot[sp->header.stblindex]; | |
4060 | dstbl = (s8 *) & dp->slot[dp->header.stblindex]; | |
4061 | ||
4062 | dsi = dp->header.freelist; /* first (whole page) free slot */ | |
4063 | sfsi = sp->header.freelist; | |
4064 | ||
4065 | /* linelock destination entry slot */ | |
4066 | dlv = & ddtlck->lv[ddtlck->index]; | |
4067 | dlv->offset = dsi; | |
4068 | ||
4069 | /* linelock source entry slot */ | |
4070 | slv = & sdtlck->lv[sdtlck->index]; | |
4071 | slv->offset = sstbl[si]; | |
4072 | xssi = slv->offset - 1; | |
4073 | ||
4074 | /* | |
4075 | * move entries | |
4076 | */ | |
4077 | ns = nd = 0; | |
4078 | for (di = 0; si < sp->header.nextindex; si++, di++) { | |
4079 | ssi = sstbl[si]; | |
4080 | dstbl[di] = dsi; | |
4081 | ||
4082 | /* is next slot contiguous ? */ | |
4083 | if (ssi != xssi + 1) { | |
4084 | /* close current linelock */ | |
4085 | slv->length = ns; | |
4086 | sdtlck->index++; | |
4087 | ||
4088 | /* open new linelock */ | |
4089 | if (sdtlck->index < sdtlck->maxcnt) | |
4090 | slv++; | |
4091 | else { | |
4092 | sdtlck = (struct dt_lock *) txLinelock(sdtlck); | |
4093 | slv = & sdtlck->lv[0]; | |
4094 | } | |
4095 | ||
4096 | slv->offset = ssi; | |
4097 | ns = 0; | |
4098 | } | |
4099 | ||
4100 | /* | |
4101 | * move head/only segment of an entry | |
4102 | */ | |
4103 | /* get dst slot */ | |
4104 | h = d = &dp->slot[dsi]; | |
4105 | ||
4106 | /* get src slot and move */ | |
4107 | s = &sp->slot[ssi]; | |
4108 | if (sp->header.flag & BT_LEAF) { | |
4109 | /* get source entry */ | |
4110 | slh = (struct ldtentry *) s; | |
4111 | dlh = (struct ldtentry *) h; | |
4112 | snamlen = slh->namlen; | |
4113 | ||
4114 | if (do_index) { | |
4115 | len = min(snamlen, DTLHDRDATALEN); | |
4116 | dlh->index = slh->index; /* little-endian */ | |
4117 | } else | |
4118 | len = min(snamlen, DTLHDRDATALEN_LEGACY); | |
4119 | ||
4120 | memcpy(dlh, slh, 6 + len * 2); | |
4121 | ||
4122 | next = slh->next; | |
4123 | ||
4124 | /* update dst head/only segment next field */ | |
4125 | dsi++; | |
4126 | dlh->next = dsi; | |
4127 | } else { | |
4128 | sih = (struct idtentry *) s; | |
4129 | snamlen = sih->namlen; | |
4130 | ||
4131 | len = min(snamlen, DTIHDRDATALEN); | |
4132 | dih = (struct idtentry *) h; | |
4133 | memcpy(dih, sih, 10 + len * 2); | |
4134 | next = sih->next; | |
4135 | ||
4136 | dsi++; | |
4137 | dih->next = dsi; | |
4138 | } | |
4139 | ||
4140 | /* free src head/only segment */ | |
4141 | s->next = sfsi; | |
4142 | s->cnt = 1; | |
4143 | sfsi = ssi; | |
4144 | ||
4145 | ns++; | |
4146 | nd++; | |
4147 | xssi = ssi; | |
4148 | ||
4149 | /* | |
4150 | * move additional segment(s) of the entry | |
4151 | */ | |
4152 | snamlen -= len; | |
4153 | while ((ssi = next) >= 0) { | |
4154 | /* is next slot contiguous ? */ | |
4155 | if (ssi != xssi + 1) { | |
4156 | /* close current linelock */ | |
4157 | slv->length = ns; | |
4158 | sdtlck->index++; | |
4159 | ||
4160 | /* open new linelock */ | |
4161 | if (sdtlck->index < sdtlck->maxcnt) | |
4162 | slv++; | |
4163 | else { | |
4164 | sdtlck = | |
4165 | (struct dt_lock *) | |
4166 | txLinelock(sdtlck); | |
4167 | slv = & sdtlck->lv[0]; | |
4168 | } | |
4169 | ||
4170 | slv->offset = ssi; | |
4171 | ns = 0; | |
4172 | } | |
4173 | ||
4174 | /* get next source segment */ | |
4175 | s = &sp->slot[ssi]; | |
4176 | ||
4177 | /* get next destination free slot */ | |
4178 | d++; | |
4179 | ||
4180 | len = min(snamlen, DTSLOTDATALEN); | |
4181 | UniStrncpy_le(d->name, s->name, len); | |
4182 | ||
4183 | ns++; | |
4184 | nd++; | |
4185 | xssi = ssi; | |
4186 | ||
4187 | dsi++; | |
4188 | d->next = dsi; | |
4189 | ||
4190 | /* free source segment */ | |
4191 | next = s->next; | |
4192 | s->next = sfsi; | |
4193 | s->cnt = 1; | |
4194 | sfsi = ssi; | |
4195 | ||
4196 | snamlen -= len; | |
4197 | } /* end while */ | |
4198 | ||
4199 | /* terminate dst last/only segment */ | |
4200 | if (h == d) { | |
4201 | /* single segment entry */ | |
4202 | if (dp->header.flag & BT_LEAF) | |
4203 | dlh->next = -1; | |
4204 | else | |
4205 | dih->next = -1; | |
4206 | } else | |
4207 | /* multi-segment entry */ | |
4208 | d->next = -1; | |
4209 | } /* end for */ | |
4210 | ||
4211 | /* close current linelock */ | |
4212 | slv->length = ns; | |
4213 | sdtlck->index++; | |
4214 | *sdtlock = sdtlck; | |
4215 | ||
4216 | dlv->length = nd; | |
4217 | ddtlck->index++; | |
4218 | *ddtlock = ddtlck; | |
4219 | ||
4220 | /* update source header */ | |
4221 | sp->header.freelist = sfsi; | |
4222 | sp->header.freecnt += nd; | |
4223 | ||
4224 | /* update destination header */ | |
4225 | dp->header.nextindex = di; | |
4226 | ||
4227 | dp->header.freelist = dsi; | |
4228 | dp->header.freecnt -= nd; | |
4229 | } | |
4230 | ||
4231 | ||
4232 | /* | |
4233 | * dtDeleteEntry() | |
4234 | * | |
4235 | * function: free a (leaf/internal) entry | |
4236 | * | |
4237 | * log freelist header, stbl, and each segment slot of entry | |
4238 | * (even though last/only segment next field is modified, | |
4239 | * physical image logging requires all segment slots of | |
4240 | * the entry logged to avoid applying previous updates | |
4241 | * to the same slots) | |
4242 | */ | |
4243 | static void dtDeleteEntry(dtpage_t * p, int fi, struct dt_lock ** dtlock) | |
4244 | { | |
4245 | int fsi; /* free entry slot index */ | |
4246 | s8 *stbl; | |
4247 | struct dtslot *t; | |
4248 | int si, freecnt; | |
4249 | struct dt_lock *dtlck = *dtlock; | |
4250 | struct lv *lv; | |
4251 | int xsi, n; | |
4252 | ||
4253 | /* get free entry slot index */ | |
4254 | stbl = DT_GETSTBL(p); | |
4255 | fsi = stbl[fi]; | |
4256 | ||
4257 | /* open new linelock */ | |
4258 | if (dtlck->index >= dtlck->maxcnt) | |
4259 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
4260 | lv = & dtlck->lv[dtlck->index]; | |
4261 | ||
4262 | lv->offset = fsi; | |
4263 | ||
4264 | /* get the head/only segment */ | |
4265 | t = &p->slot[fsi]; | |
4266 | if (p->header.flag & BT_LEAF) | |
4267 | si = ((struct ldtentry *) t)->next; | |
4268 | else | |
4269 | si = ((struct idtentry *) t)->next; | |
4270 | t->next = si; | |
4271 | t->cnt = 1; | |
4272 | ||
4273 | n = freecnt = 1; | |
4274 | xsi = fsi; | |
4275 | ||
4276 | /* find the last/only segment */ | |
4277 | while (si >= 0) { | |
4278 | /* is next slot contiguous ? */ | |
4279 | if (si != xsi + 1) { | |
4280 | /* close current linelock */ | |
4281 | lv->length = n; | |
4282 | dtlck->index++; | |
4283 | ||
4284 | /* open new linelock */ | |
4285 | if (dtlck->index < dtlck->maxcnt) | |
4286 | lv++; | |
4287 | else { | |
4288 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
4289 | lv = & dtlck->lv[0]; | |
4290 | } | |
4291 | ||
4292 | lv->offset = si; | |
4293 | n = 0; | |
4294 | } | |
4295 | ||
4296 | n++; | |
4297 | xsi = si; | |
4298 | freecnt++; | |
4299 | ||
4300 | t = &p->slot[si]; | |
4301 | t->cnt = 1; | |
4302 | si = t->next; | |
4303 | } | |
4304 | ||
4305 | /* close current linelock */ | |
4306 | lv->length = n; | |
4307 | dtlck->index++; | |
4308 | ||
4309 | *dtlock = dtlck; | |
4310 | ||
4311 | /* update freelist */ | |
4312 | t->next = p->header.freelist; | |
4313 | p->header.freelist = fsi; | |
4314 | p->header.freecnt += freecnt; | |
4315 | ||
4316 | /* if delete from middle, | |
4317 | * shift left the succedding entries in the stbl | |
4318 | */ | |
4319 | si = p->header.nextindex; | |
4320 | if (fi < si - 1) | |
4321 | memmove(&stbl[fi], &stbl[fi + 1], si - fi - 1); | |
4322 | ||
4323 | p->header.nextindex--; | |
4324 | } | |
4325 | ||
4326 | ||
4327 | /* | |
4328 | * dtTruncateEntry() | |
4329 | * | |
4330 | * function: truncate a (leaf/internal) entry | |
4331 | * | |
4332 | * log freelist header, stbl, and each segment slot of entry | |
4333 | * (even though last/only segment next field is modified, | |
4334 | * physical image logging requires all segment slots of | |
4335 | * the entry logged to avoid applying previous updates | |
4336 | * to the same slots) | |
4337 | */ | |
4338 | static void dtTruncateEntry(dtpage_t * p, int ti, struct dt_lock ** dtlock) | |
4339 | { | |
4340 | int tsi; /* truncate entry slot index */ | |
4341 | s8 *stbl; | |
4342 | struct dtslot *t; | |
4343 | int si, freecnt; | |
4344 | struct dt_lock *dtlck = *dtlock; | |
4345 | struct lv *lv; | |
4346 | int fsi, xsi, n; | |
4347 | ||
4348 | /* get free entry slot index */ | |
4349 | stbl = DT_GETSTBL(p); | |
4350 | tsi = stbl[ti]; | |
4351 | ||
4352 | /* open new linelock */ | |
4353 | if (dtlck->index >= dtlck->maxcnt) | |
4354 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
4355 | lv = & dtlck->lv[dtlck->index]; | |
4356 | ||
4357 | lv->offset = tsi; | |
4358 | ||
4359 | /* get the head/only segment */ | |
4360 | t = &p->slot[tsi]; | |
4361 | ASSERT(p->header.flag & BT_INTERNAL); | |
4362 | ((struct idtentry *) t)->namlen = 0; | |
4363 | si = ((struct idtentry *) t)->next; | |
4364 | ((struct idtentry *) t)->next = -1; | |
4365 | ||
4366 | n = 1; | |
4367 | freecnt = 0; | |
4368 | fsi = si; | |
4369 | xsi = tsi; | |
4370 | ||
4371 | /* find the last/only segment */ | |
4372 | while (si >= 0) { | |
4373 | /* is next slot contiguous ? */ | |
4374 | if (si != xsi + 1) { | |
4375 | /* close current linelock */ | |
4376 | lv->length = n; | |
4377 | dtlck->index++; | |
4378 | ||
4379 | /* open new linelock */ | |
4380 | if (dtlck->index < dtlck->maxcnt) | |
4381 | lv++; | |
4382 | else { | |
4383 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
4384 | lv = & dtlck->lv[0]; | |
4385 | } | |
4386 | ||
4387 | lv->offset = si; | |
4388 | n = 0; | |
4389 | } | |
4390 | ||
4391 | n++; | |
4392 | xsi = si; | |
4393 | freecnt++; | |
4394 | ||
4395 | t = &p->slot[si]; | |
4396 | t->cnt = 1; | |
4397 | si = t->next; | |
4398 | } | |
4399 | ||
4400 | /* close current linelock */ | |
4401 | lv->length = n; | |
4402 | dtlck->index++; | |
4403 | ||
4404 | *dtlock = dtlck; | |
4405 | ||
4406 | /* update freelist */ | |
4407 | if (freecnt == 0) | |
4408 | return; | |
4409 | t->next = p->header.freelist; | |
4410 | p->header.freelist = fsi; | |
4411 | p->header.freecnt += freecnt; | |
4412 | } | |
4413 | ||
4414 | ||
4415 | /* | |
4416 | * dtLinelockFreelist() | |
4417 | */ | |
4418 | static void dtLinelockFreelist(dtpage_t * p, /* directory page */ | |
4419 | int m, /* max slot index */ | |
4420 | struct dt_lock ** dtlock) | |
4421 | { | |
4422 | int fsi; /* free entry slot index */ | |
4423 | struct dtslot *t; | |
4424 | int si; | |
4425 | struct dt_lock *dtlck = *dtlock; | |
4426 | struct lv *lv; | |
4427 | int xsi, n; | |
4428 | ||
4429 | /* get free entry slot index */ | |
4430 | fsi = p->header.freelist; | |
4431 | ||
4432 | /* open new linelock */ | |
4433 | if (dtlck->index >= dtlck->maxcnt) | |
4434 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
4435 | lv = & dtlck->lv[dtlck->index]; | |
4436 | ||
4437 | lv->offset = fsi; | |
4438 | ||
4439 | n = 1; | |
4440 | xsi = fsi; | |
4441 | ||
4442 | t = &p->slot[fsi]; | |
4443 | si = t->next; | |
4444 | ||
4445 | /* find the last/only segment */ | |
4446 | while (si < m && si >= 0) { | |
4447 | /* is next slot contiguous ? */ | |
4448 | if (si != xsi + 1) { | |
4449 | /* close current linelock */ | |
4450 | lv->length = n; | |
4451 | dtlck->index++; | |
4452 | ||
4453 | /* open new linelock */ | |
4454 | if (dtlck->index < dtlck->maxcnt) | |
4455 | lv++; | |
4456 | else { | |
4457 | dtlck = (struct dt_lock *) txLinelock(dtlck); | |
4458 | lv = & dtlck->lv[0]; | |
4459 | } | |
4460 | ||
4461 | lv->offset = si; | |
4462 | n = 0; | |
4463 | } | |
4464 | ||
4465 | n++; | |
4466 | xsi = si; | |
4467 | ||
4468 | t = &p->slot[si]; | |
4469 | si = t->next; | |
4470 | } | |
4471 | ||
4472 | /* close current linelock */ | |
4473 | lv->length = n; | |
4474 | dtlck->index++; | |
4475 | ||
4476 | *dtlock = dtlck; | |
4477 | } | |
4478 | ||
4479 | ||
4480 | /* | |
4481 | * NAME: dtModify | |
4482 | * | |
4483 | * FUNCTION: Modify the inode number part of a directory entry | |
4484 | * | |
4485 | * PARAMETERS: | |
4486 | * tid - Transaction id | |
4487 | * ip - Inode of parent directory | |
4488 | * key - Name of entry to be modified | |
4489 | * orig_ino - Original inode number expected in entry | |
4490 | * new_ino - New inode number to put into entry | |
4491 | * flag - JFS_RENAME | |
4492 | * | |
4493 | * RETURNS: | |
4494 | * -ESTALE - If entry found does not match orig_ino passed in | |
4495 | * -ENOENT - If no entry can be found to match key | |
4496 | * 0 - If successfully modified entry | |
4497 | */ | |
4498 | int dtModify(tid_t tid, struct inode *ip, | |
4499 | struct component_name * key, ino_t * orig_ino, ino_t new_ino, int flag) | |
4500 | { | |
4501 | int rc; | |
4502 | s64 bn; | |
4503 | struct metapage *mp; | |
4504 | dtpage_t *p; | |
4505 | int index; | |
4506 | struct btstack btstack; | |
4507 | struct tlock *tlck; | |
4508 | struct dt_lock *dtlck; | |
4509 | struct lv *lv; | |
4510 | s8 *stbl; | |
4511 | int entry_si; /* entry slot index */ | |
4512 | struct ldtentry *entry; | |
4513 | ||
4514 | /* | |
4515 | * search for the entry to modify: | |
4516 | * | |
4517 | * dtSearch() returns (leaf page pinned, index at which to modify). | |
4518 | */ | |
4519 | if ((rc = dtSearch(ip, key, orig_ino, &btstack, flag))) | |
4520 | return rc; | |
4521 | ||
4522 | /* retrieve search result */ | |
4523 | DT_GETSEARCH(ip, btstack.top, bn, mp, p, index); | |
4524 | ||
4525 | BT_MARK_DIRTY(mp, ip); | |
4526 | /* | |
4527 | * acquire a transaction lock on the leaf page of named entry | |
4528 | */ | |
4529 | tlck = txLock(tid, ip, mp, tlckDTREE | tlckENTRY); | |
4530 | dtlck = (struct dt_lock *) & tlck->lock; | |
4531 | ||
4532 | /* get slot index of the entry */ | |
4533 | stbl = DT_GETSTBL(p); | |
4534 | entry_si = stbl[index]; | |
4535 | ||
4536 | /* linelock entry */ | |
4537 | ASSERT(dtlck->index == 0); | |
4538 | lv = & dtlck->lv[0]; | |
4539 | lv->offset = entry_si; | |
4540 | lv->length = 1; | |
4541 | dtlck->index++; | |
4542 | ||
4543 | /* get the head/only segment */ | |
4544 | entry = (struct ldtentry *) & p->slot[entry_si]; | |
4545 | ||
4546 | /* substitute the inode number of the entry */ | |
4547 | entry->inumber = cpu_to_le32(new_ino); | |
4548 | ||
4549 | /* unpin the leaf page */ | |
4550 | DT_PUTPAGE(mp); | |
4551 | ||
4552 | return 0; | |
4553 | } | |
4554 | ||
4555 | #ifdef _JFS_DEBUG_DTREE | |
4556 | /* | |
4557 | * dtDisplayTree() | |
4558 | * | |
4559 | * function: traverse forward | |
4560 | */ | |
4561 | int dtDisplayTree(struct inode *ip) | |
4562 | { | |
4563 | int rc; | |
4564 | struct metapage *mp; | |
4565 | dtpage_t *p; | |
4566 | s64 bn, pbn; | |
4567 | int index, lastindex, v, h; | |
4568 | pxd_t *xd; | |
4569 | struct btstack btstack; | |
4570 | struct btframe *btsp; | |
4571 | struct btframe *parent; | |
4572 | u8 *stbl; | |
4573 | int psize = 256; | |
4574 | ||
4575 | printk("display B+-tree.\n"); | |
4576 | ||
4577 | /* clear stack */ | |
4578 | btsp = btstack.stack; | |
4579 | ||
4580 | /* | |
4581 | * start with root | |
4582 | * | |
4583 | * root resides in the inode | |
4584 | */ | |
4585 | bn = 0; | |
4586 | v = h = 0; | |
4587 | ||
4588 | /* | |
4589 | * first access of each page: | |
4590 | */ | |
4591 | newPage: | |
4592 | DT_GETPAGE(ip, bn, mp, psize, p, rc); | |
4593 | if (rc) | |
4594 | return rc; | |
4595 | ||
4596 | /* process entries forward from first index */ | |
4597 | index = 0; | |
4598 | lastindex = p->header.nextindex - 1; | |
4599 | ||
4600 | if (p->header.flag & BT_INTERNAL) { | |
4601 | /* | |
4602 | * first access of each internal page | |
4603 | */ | |
4604 | printf("internal page "); | |
4605 | dtDisplayPage(ip, bn, p); | |
4606 | ||
4607 | goto getChild; | |
4608 | } else { /* (p->header.flag & BT_LEAF) */ | |
4609 | ||
4610 | /* | |
4611 | * first access of each leaf page | |
4612 | */ | |
4613 | printf("leaf page "); | |
4614 | dtDisplayPage(ip, bn, p); | |
4615 | ||
4616 | /* | |
4617 | * process leaf page entries | |
4618 | * | |
4619 | for ( ; index <= lastindex; index++) | |
4620 | { | |
4621 | } | |
4622 | */ | |
4623 | ||
4624 | /* unpin the leaf page */ | |
4625 | DT_PUTPAGE(mp); | |
4626 | } | |
4627 | ||
4628 | /* | |
4629 | * go back up to the parent page | |
4630 | */ | |
4631 | getParent: | |
4632 | /* pop/restore parent entry for the current child page */ | |
4633 | if ((parent = (btsp == btstack.stack ? NULL : --btsp)) == NULL) | |
4634 | /* current page must have been root */ | |
4635 | return; | |
4636 | ||
4637 | /* | |
4638 | * parent page scan completed | |
4639 | */ | |
4640 | if ((index = parent->index) == (lastindex = parent->lastindex)) { | |
4641 | /* go back up to the parent page */ | |
4642 | goto getParent; | |
4643 | } | |
4644 | ||
4645 | /* | |
4646 | * parent page has entries remaining | |
4647 | */ | |
4648 | /* get back the parent page */ | |
4649 | bn = parent->bn; | |
4650 | /* v = parent->level; */ | |
4651 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
4652 | if (rc) | |
4653 | return rc; | |
4654 | ||
4655 | /* get next parent entry */ | |
4656 | index++; | |
4657 | ||
4658 | /* | |
4659 | * internal page: go down to child page of current entry | |
4660 | */ | |
4661 | getChild: | |
4662 | /* push/save current parent entry for the child page */ | |
4663 | btsp->bn = pbn = bn; | |
4664 | btsp->index = index; | |
4665 | btsp->lastindex = lastindex; | |
4666 | /* btsp->level = v; */ | |
4667 | /* btsp->node = h; */ | |
4668 | ++btsp; | |
4669 | ||
4670 | /* get current entry for the child page */ | |
4671 | stbl = DT_GETSTBL(p); | |
4672 | xd = (pxd_t *) & p->slot[stbl[index]]; | |
4673 | ||
4674 | /* | |
4675 | * first access of each internal entry: | |
4676 | */ | |
4677 | ||
4678 | /* get child page */ | |
4679 | bn = addressPXD(xd); | |
4680 | psize = lengthPXD(xd) << ip->i_ipmnt->i_l2bsize; | |
4681 | ||
4682 | printk("traverse down 0x%Lx[%d]->0x%Lx\n", pbn, index, bn); | |
4683 | v++; | |
4684 | h = index; | |
4685 | ||
4686 | /* release parent page */ | |
4687 | DT_PUTPAGE(mp); | |
4688 | ||
4689 | /* process the child page */ | |
4690 | goto newPage; | |
4691 | } | |
4692 | ||
4693 | ||
4694 | /* | |
4695 | * dtDisplayPage() | |
4696 | * | |
4697 | * function: display page | |
4698 | */ | |
4699 | int dtDisplayPage(struct inode *ip, s64 bn, dtpage_t * p) | |
4700 | { | |
4701 | int rc; | |
4702 | struct metapage *mp; | |
4703 | struct ldtentry *lh; | |
4704 | struct idtentry *ih; | |
4705 | pxd_t *xd; | |
4706 | int i, j; | |
4707 | u8 *stbl; | |
4708 | wchar_t name[JFS_NAME_MAX + 1]; | |
4709 | struct component_name key = { 0, name }; | |
4710 | int freepage = 0; | |
4711 | ||
4712 | if (p == NULL) { | |
4713 | freepage = 1; | |
4714 | DT_GETPAGE(ip, bn, mp, PSIZE, p, rc); | |
4715 | if (rc) | |
4716 | return rc; | |
4717 | } | |
4718 | ||
4719 | /* display page control */ | |
4720 | printk("bn:0x%Lx flag:0x%08x nextindex:%d\n", | |
4721 | bn, p->header.flag, p->header.nextindex); | |
4722 | ||
4723 | /* display entries */ | |
4724 | stbl = DT_GETSTBL(p); | |
4725 | for (i = 0, j = 1; i < p->header.nextindex; i++, j++) { | |
4726 | dtGetKey(p, i, &key, JFS_SBI(ip->i_sb)->mntflag); | |
4727 | key.name[key.namlen] = '\0'; | |
4728 | if (p->header.flag & BT_LEAF) { | |
4729 | lh = (struct ldtentry *) & p->slot[stbl[i]]; | |
4730 | printf("\t[%d] %s:%d", i, key.name, | |
4731 | le32_to_cpu(lh->inumber)); | |
4732 | } else { | |
4733 | ih = (struct idtentry *) & p->slot[stbl[i]]; | |
4734 | xd = (pxd_t *) ih; | |
4735 | bn = addressPXD(xd); | |
4736 | printf("\t[%d] %s:0x%Lx", i, key.name, bn); | |
4737 | } | |
4738 | ||
4739 | if (j == 4) { | |
4740 | printf("\n"); | |
4741 | j = 0; | |
4742 | } | |
4743 | } | |
4744 | ||
4745 | printf("\n"); | |
4746 | ||
4747 | if (freepage) | |
4748 | DT_PUTPAGE(mp); | |
4749 | ||
4750 | return 0; | |
4751 | } | |
4752 | #endif /* _JFS_DEBUG_DTREE */ |