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Commit | Line | Data |
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1da177e4 | 1 | /* |
7fab479b | 2 | * Copyright (C) International Business Machines Corp., 2000-2005 |
1da177e4 LT |
3 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
63f83c9f | 7 | * the Free Software Foundation; either version 2 of the License, or |
1da177e4 | 8 | * (at your option) any later version. |
63f83c9f | 9 | * |
1da177e4 LT |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
63f83c9f | 16 | * along with this program; if not, write to the Free Software |
1da177e4 LT |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ | |
19 | ||
20 | #include <linux/fs.h> | |
7fab479b DK |
21 | #include <linux/mm.h> |
22 | #include <linux/bio.h> | |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/buffer_head.h> | |
25 | #include <linux/mempool.h> | |
1da177e4 LT |
26 | #include "jfs_incore.h" |
27 | #include "jfs_superblock.h" | |
28 | #include "jfs_filsys.h" | |
29 | #include "jfs_metapage.h" | |
30 | #include "jfs_txnmgr.h" | |
31 | #include "jfs_debug.h" | |
32 | ||
1da177e4 LT |
33 | #ifdef CONFIG_JFS_STATISTICS |
34 | static struct { | |
35 | uint pagealloc; /* # of page allocations */ | |
36 | uint pagefree; /* # of page frees */ | |
37 | uint lockwait; /* # of sleeping lock_metapage() calls */ | |
38 | } mpStat; | |
39 | #endif | |
40 | ||
7fab479b DK |
41 | #define metapage_locked(mp) test_bit(META_locked, &(mp)->flag) |
42 | #define trylock_metapage(mp) test_and_set_bit(META_locked, &(mp)->flag) | |
1da177e4 LT |
43 | |
44 | static inline void unlock_metapage(struct metapage *mp) | |
45 | { | |
46 | clear_bit(META_locked, &mp->flag); | |
47 | wake_up(&mp->wait); | |
48 | } | |
49 | ||
7fab479b | 50 | static inline void __lock_metapage(struct metapage *mp) |
1da177e4 LT |
51 | { |
52 | DECLARE_WAITQUEUE(wait, current); | |
1da177e4 | 53 | INCREMENT(mpStat.lockwait); |
1da177e4 LT |
54 | add_wait_queue_exclusive(&mp->wait, &wait); |
55 | do { | |
56 | set_current_state(TASK_UNINTERRUPTIBLE); | |
57 | if (metapage_locked(mp)) { | |
7fab479b | 58 | unlock_page(mp->page); |
4aa0d230 | 59 | io_schedule(); |
7fab479b | 60 | lock_page(mp->page); |
1da177e4 LT |
61 | } |
62 | } while (trylock_metapage(mp)); | |
63 | __set_current_state(TASK_RUNNING); | |
64 | remove_wait_queue(&mp->wait, &wait); | |
65 | } | |
66 | ||
7fab479b DK |
67 | /* |
68 | * Must have mp->page locked | |
69 | */ | |
1da177e4 LT |
70 | static inline void lock_metapage(struct metapage *mp) |
71 | { | |
72 | if (trylock_metapage(mp)) | |
73 | __lock_metapage(mp); | |
74 | } | |
75 | ||
76 | #define METAPOOL_MIN_PAGES 32 | |
e18b890b | 77 | static struct kmem_cache *metapage_cache; |
1da177e4 LT |
78 | static mempool_t *metapage_mempool; |
79 | ||
7fab479b DK |
80 | #define MPS_PER_PAGE (PAGE_CACHE_SIZE >> L2PSIZE) |
81 | ||
82 | #if MPS_PER_PAGE > 1 | |
83 | ||
84 | struct meta_anchor { | |
85 | int mp_count; | |
86 | atomic_t io_count; | |
87 | struct metapage *mp[MPS_PER_PAGE]; | |
88 | }; | |
4c21e2f2 | 89 | #define mp_anchor(page) ((struct meta_anchor *)page_private(page)) |
7fab479b DK |
90 | |
91 | static inline struct metapage *page_to_mp(struct page *page, uint offset) | |
92 | { | |
93 | if (!PagePrivate(page)) | |
94 | return NULL; | |
95 | return mp_anchor(page)->mp[offset >> L2PSIZE]; | |
96 | } | |
97 | ||
98 | static inline int insert_metapage(struct page *page, struct metapage *mp) | |
99 | { | |
100 | struct meta_anchor *a; | |
101 | int index; | |
102 | int l2mp_blocks; /* log2 blocks per metapage */ | |
103 | ||
104 | if (PagePrivate(page)) | |
105 | a = mp_anchor(page); | |
106 | else { | |
5b3030e3 | 107 | a = kzalloc(sizeof(struct meta_anchor), GFP_NOFS); |
7fab479b DK |
108 | if (!a) |
109 | return -ENOMEM; | |
4c21e2f2 | 110 | set_page_private(page, (unsigned long)a); |
7fab479b DK |
111 | SetPagePrivate(page); |
112 | kmap(page); | |
113 | } | |
114 | ||
115 | if (mp) { | |
116 | l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; | |
117 | index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); | |
118 | a->mp_count++; | |
119 | a->mp[index] = mp; | |
120 | } | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static inline void remove_metapage(struct page *page, struct metapage *mp) | |
126 | { | |
127 | struct meta_anchor *a = mp_anchor(page); | |
128 | int l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; | |
129 | int index; | |
130 | ||
131 | index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); | |
132 | ||
133 | BUG_ON(a->mp[index] != mp); | |
134 | ||
135 | a->mp[index] = NULL; | |
136 | if (--a->mp_count == 0) { | |
137 | kfree(a); | |
4c21e2f2 | 138 | set_page_private(page, 0); |
7fab479b DK |
139 | ClearPagePrivate(page); |
140 | kunmap(page); | |
141 | } | |
142 | } | |
143 | ||
144 | static inline void inc_io(struct page *page) | |
145 | { | |
146 | atomic_inc(&mp_anchor(page)->io_count); | |
147 | } | |
148 | ||
149 | static inline void dec_io(struct page *page, void (*handler) (struct page *)) | |
150 | { | |
151 | if (atomic_dec_and_test(&mp_anchor(page)->io_count)) | |
152 | handler(page); | |
153 | } | |
154 | ||
155 | #else | |
156 | static inline struct metapage *page_to_mp(struct page *page, uint offset) | |
157 | { | |
4c21e2f2 | 158 | return PagePrivate(page) ? (struct metapage *)page_private(page) : NULL; |
7fab479b DK |
159 | } |
160 | ||
161 | static inline int insert_metapage(struct page *page, struct metapage *mp) | |
162 | { | |
163 | if (mp) { | |
4c21e2f2 | 164 | set_page_private(page, (unsigned long)mp); |
7fab479b DK |
165 | SetPagePrivate(page); |
166 | kmap(page); | |
167 | } | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static inline void remove_metapage(struct page *page, struct metapage *mp) | |
172 | { | |
4c21e2f2 | 173 | set_page_private(page, 0); |
7fab479b DK |
174 | ClearPagePrivate(page); |
175 | kunmap(page); | |
176 | } | |
177 | ||
178 | #define inc_io(page) do {} while(0) | |
179 | #define dec_io(page, handler) handler(page) | |
180 | ||
181 | #endif | |
182 | ||
e18b890b | 183 | static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags) |
1da177e4 LT |
184 | { |
185 | struct metapage *mp = (struct metapage *)foo; | |
186 | ||
a35afb83 CL |
187 | mp->lid = 0; |
188 | mp->lsn = 0; | |
189 | mp->flag = 0; | |
190 | mp->data = NULL; | |
191 | mp->clsn = 0; | |
192 | mp->log = NULL; | |
193 | set_bit(META_free, &mp->flag); | |
194 | init_waitqueue_head(&mp->wait); | |
1da177e4 LT |
195 | } |
196 | ||
27496a8c | 197 | static inline struct metapage *alloc_metapage(gfp_t gfp_mask) |
1da177e4 LT |
198 | { |
199 | return mempool_alloc(metapage_mempool, gfp_mask); | |
200 | } | |
201 | ||
202 | static inline void free_metapage(struct metapage *mp) | |
203 | { | |
204 | mp->flag = 0; | |
205 | set_bit(META_free, &mp->flag); | |
206 | ||
207 | mempool_free(mp, metapage_mempool); | |
208 | } | |
209 | ||
210 | int __init metapage_init(void) | |
211 | { | |
212 | /* | |
213 | * Allocate the metapage structures | |
214 | */ | |
215 | metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage), | |
20c2df83 | 216 | 0, 0, init_once); |
1da177e4 LT |
217 | if (metapage_cache == NULL) |
218 | return -ENOMEM; | |
219 | ||
93d2341c MD |
220 | metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES, |
221 | metapage_cache); | |
1da177e4 LT |
222 | |
223 | if (metapage_mempool == NULL) { | |
224 | kmem_cache_destroy(metapage_cache); | |
225 | return -ENOMEM; | |
226 | } | |
1da177e4 LT |
227 | |
228 | return 0; | |
229 | } | |
230 | ||
231 | void metapage_exit(void) | |
232 | { | |
233 | mempool_destroy(metapage_mempool); | |
234 | kmem_cache_destroy(metapage_cache); | |
235 | } | |
236 | ||
7fab479b DK |
237 | static inline void drop_metapage(struct page *page, struct metapage *mp) |
238 | { | |
239 | if (mp->count || mp->nohomeok || test_bit(META_dirty, &mp->flag) || | |
240 | test_bit(META_io, &mp->flag)) | |
241 | return; | |
242 | remove_metapage(page, mp); | |
243 | INCREMENT(mpStat.pagefree); | |
244 | free_metapage(mp); | |
245 | } | |
246 | ||
1da177e4 | 247 | /* |
7fab479b | 248 | * Metapage address space operations |
1da177e4 | 249 | */ |
7fab479b DK |
250 | |
251 | static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock, | |
252 | unsigned int *len) | |
1da177e4 | 253 | { |
7fab479b DK |
254 | int rc = 0; |
255 | int xflag; | |
256 | s64 xaddr; | |
ba52de12 | 257 | sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
7fab479b DK |
258 | inode->i_blkbits; |
259 | ||
260 | if (lblock >= file_blocks) | |
261 | return 0; | |
262 | if (lblock + *len > file_blocks) | |
263 | *len = file_blocks - lblock; | |
264 | ||
265 | if (inode->i_ino) { | |
266 | rc = xtLookup(inode, (s64)lblock, *len, &xflag, &xaddr, len, 0); | |
267 | if ((rc == 0) && *len) | |
268 | lblock = (sector_t)xaddr; | |
269 | else | |
270 | lblock = 0; | |
271 | } /* else no mapping */ | |
272 | ||
273 | return lblock; | |
1da177e4 LT |
274 | } |
275 | ||
7fab479b | 276 | static void last_read_complete(struct page *page) |
1da177e4 | 277 | { |
7fab479b DK |
278 | if (!PageError(page)) |
279 | SetPageUptodate(page); | |
280 | unlock_page(page); | |
281 | } | |
282 | ||
6712ecf8 | 283 | static void metapage_read_end_io(struct bio *bio, int err) |
7fab479b DK |
284 | { |
285 | struct page *page = bio->bi_private; | |
286 | ||
7fab479b DK |
287 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
288 | printk(KERN_ERR "metapage_read_end_io: I/O error\n"); | |
289 | SetPageError(page); | |
1da177e4 LT |
290 | } |
291 | ||
7fab479b DK |
292 | dec_io(page, last_read_complete); |
293 | bio_put(bio); | |
294 | ||
295 | return 0; | |
1da177e4 LT |
296 | } |
297 | ||
7fab479b | 298 | static void remove_from_logsync(struct metapage *mp) |
1da177e4 | 299 | { |
7fab479b DK |
300 | struct jfs_log *log = mp->log; |
301 | unsigned long flags; | |
302 | /* | |
303 | * This can race. Recheck that log hasn't been set to null, and after | |
304 | * acquiring logsync lock, recheck lsn | |
305 | */ | |
306 | if (!log) | |
307 | return; | |
308 | ||
309 | LOGSYNC_LOCK(log, flags); | |
310 | if (mp->lsn) { | |
311 | mp->log = NULL; | |
312 | mp->lsn = 0; | |
313 | mp->clsn = 0; | |
314 | log->count--; | |
315 | list_del(&mp->synclist); | |
316 | } | |
317 | LOGSYNC_UNLOCK(log, flags); | |
318 | } | |
1da177e4 | 319 | |
7fab479b DK |
320 | static void last_write_complete(struct page *page) |
321 | { | |
322 | struct metapage *mp; | |
323 | unsigned int offset; | |
324 | ||
325 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
326 | mp = page_to_mp(page, offset); | |
327 | if (mp && test_bit(META_io, &mp->flag)) { | |
328 | if (mp->lsn) | |
329 | remove_from_logsync(mp); | |
330 | clear_bit(META_io, &mp->flag); | |
331 | } | |
332 | /* | |
333 | * I'd like to call drop_metapage here, but I don't think it's | |
334 | * safe unless I have the page locked | |
335 | */ | |
336 | } | |
337 | end_page_writeback(page); | |
1da177e4 LT |
338 | } |
339 | ||
6712ecf8 | 340 | static void metapage_write_end_io(struct bio *bio, int err) |
1da177e4 | 341 | { |
7fab479b DK |
342 | struct page *page = bio->bi_private; |
343 | ||
344 | BUG_ON(!PagePrivate(page)); | |
345 | ||
7fab479b DK |
346 | if (! test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
347 | printk(KERN_ERR "metapage_write_end_io: I/O error\n"); | |
348 | SetPageError(page); | |
349 | } | |
350 | dec_io(page, last_write_complete); | |
351 | bio_put(bio); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static int metapage_writepage(struct page *page, struct writeback_control *wbc) | |
356 | { | |
357 | struct bio *bio = NULL; | |
358 | unsigned int block_offset; /* block offset of mp within page */ | |
359 | struct inode *inode = page->mapping->host; | |
360 | unsigned int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage; | |
361 | unsigned int len; | |
362 | unsigned int xlen; | |
363 | struct metapage *mp; | |
364 | int redirty = 0; | |
365 | sector_t lblock; | |
366 | sector_t pblock; | |
367 | sector_t next_block = 0; | |
368 | sector_t page_start; | |
369 | unsigned long bio_bytes = 0; | |
370 | unsigned long bio_offset = 0; | |
371 | unsigned int offset; | |
372 | ||
373 | page_start = (sector_t)page->index << | |
374 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
375 | BUG_ON(!PageLocked(page)); | |
376 | BUG_ON(PageWriteback(page)); | |
377 | ||
378 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
379 | mp = page_to_mp(page, offset); | |
380 | ||
381 | if (!mp || !test_bit(META_dirty, &mp->flag)) | |
382 | continue; | |
383 | ||
384 | if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) { | |
385 | redirty = 1; | |
ac17b8b5 DK |
386 | /* |
387 | * Make sure this page isn't blocked indefinitely. | |
388 | * If the journal isn't undergoing I/O, push it | |
389 | */ | |
390 | if (mp->log && !(mp->log->cflag & logGC_PAGEOUT)) | |
391 | jfs_flush_journal(mp->log, 0); | |
7fab479b DK |
392 | continue; |
393 | } | |
394 | ||
395 | clear_bit(META_dirty, &mp->flag); | |
396 | block_offset = offset >> inode->i_blkbits; | |
397 | lblock = page_start + block_offset; | |
398 | if (bio) { | |
399 | if (xlen && lblock == next_block) { | |
400 | /* Contiguous, in memory & on disk */ | |
401 | len = min(xlen, blocks_per_mp); | |
402 | xlen -= len; | |
403 | bio_bytes += len << inode->i_blkbits; | |
404 | set_bit(META_io, &mp->flag); | |
405 | continue; | |
406 | } | |
407 | /* Not contiguous */ | |
408 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < | |
409 | bio_bytes) | |
410 | goto add_failed; | |
411 | /* | |
412 | * Increment counter before submitting i/o to keep | |
413 | * count from hitting zero before we're through | |
414 | */ | |
415 | inc_io(page); | |
416 | if (!bio->bi_size) | |
417 | goto dump_bio; | |
418 | submit_bio(WRITE, bio); | |
419 | bio = NULL; | |
420 | } else { | |
421 | set_page_writeback(page); | |
422 | inc_io(page); | |
423 | } | |
424 | xlen = (PAGE_CACHE_SIZE - offset) >> inode->i_blkbits; | |
425 | pblock = metapage_get_blocks(inode, lblock, &xlen); | |
426 | if (!pblock) { | |
427 | /* Need better error handling */ | |
428 | printk(KERN_ERR "JFS: metapage_get_blocks failed\n"); | |
429 | dec_io(page, last_write_complete); | |
430 | continue; | |
431 | } | |
432 | set_bit(META_io, &mp->flag); | |
433 | len = min(xlen, (uint) JFS_SBI(inode->i_sb)->nbperpage); | |
434 | ||
435 | bio = bio_alloc(GFP_NOFS, 1); | |
436 | bio->bi_bdev = inode->i_sb->s_bdev; | |
437 | bio->bi_sector = pblock << (inode->i_blkbits - 9); | |
438 | bio->bi_end_io = metapage_write_end_io; | |
439 | bio->bi_private = page; | |
440 | ||
441 | /* Don't call bio_add_page yet, we may add to this vec */ | |
442 | bio_offset = offset; | |
443 | bio_bytes = len << inode->i_blkbits; | |
444 | ||
445 | xlen -= len; | |
446 | next_block = lblock + len; | |
447 | } | |
448 | if (bio) { | |
449 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes) | |
450 | goto add_failed; | |
451 | if (!bio->bi_size) | |
452 | goto dump_bio; | |
63f83c9f | 453 | |
7fab479b DK |
454 | submit_bio(WRITE, bio); |
455 | } | |
456 | if (redirty) | |
457 | redirty_page_for_writepage(wbc, page); | |
458 | ||
459 | unlock_page(page); | |
460 | ||
461 | return 0; | |
462 | add_failed: | |
463 | /* We should never reach here, since we're only adding one vec */ | |
464 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
465 | goto skip; | |
466 | dump_bio: | |
288e4d83 DK |
467 | print_hex_dump(KERN_ERR, "JFS: dump of bio: ", DUMP_PREFIX_ADDRESS, 16, |
468 | 4, bio, sizeof(*bio), 0); | |
7fab479b DK |
469 | skip: |
470 | bio_put(bio); | |
471 | unlock_page(page); | |
472 | dec_io(page, last_write_complete); | |
473 | ||
474 | return -EIO; | |
475 | } | |
476 | ||
477 | static int metapage_readpage(struct file *fp, struct page *page) | |
478 | { | |
479 | struct inode *inode = page->mapping->host; | |
480 | struct bio *bio = NULL; | |
481 | unsigned int block_offset; | |
482 | unsigned int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits; | |
483 | sector_t page_start; /* address of page in fs blocks */ | |
484 | sector_t pblock; | |
485 | unsigned int xlen; | |
486 | unsigned int len; | |
487 | unsigned int offset; | |
488 | ||
489 | BUG_ON(!PageLocked(page)); | |
490 | page_start = (sector_t)page->index << | |
491 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
492 | ||
493 | block_offset = 0; | |
494 | while (block_offset < blocks_per_page) { | |
495 | xlen = blocks_per_page - block_offset; | |
496 | pblock = metapage_get_blocks(inode, page_start + block_offset, | |
497 | &xlen); | |
498 | if (pblock) { | |
499 | if (!PagePrivate(page)) | |
500 | insert_metapage(page, NULL); | |
501 | inc_io(page); | |
502 | if (bio) | |
503 | submit_bio(READ, bio); | |
504 | ||
505 | bio = bio_alloc(GFP_NOFS, 1); | |
506 | bio->bi_bdev = inode->i_sb->s_bdev; | |
507 | bio->bi_sector = pblock << (inode->i_blkbits - 9); | |
508 | bio->bi_end_io = metapage_read_end_io; | |
509 | bio->bi_private = page; | |
510 | len = xlen << inode->i_blkbits; | |
511 | offset = block_offset << inode->i_blkbits; | |
512 | if (bio_add_page(bio, page, len, offset) < len) | |
513 | goto add_failed; | |
514 | block_offset += xlen; | |
515 | } else | |
516 | block_offset++; | |
1da177e4 | 517 | } |
7fab479b DK |
518 | if (bio) |
519 | submit_bio(READ, bio); | |
520 | else | |
521 | unlock_page(page); | |
522 | ||
523 | return 0; | |
1da177e4 | 524 | |
7fab479b DK |
525 | add_failed: |
526 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
527 | bio_put(bio); | |
528 | dec_io(page, last_read_complete); | |
529 | return -EIO; | |
1da177e4 LT |
530 | } |
531 | ||
27496a8c | 532 | static int metapage_releasepage(struct page *page, gfp_t gfp_mask) |
7fab479b DK |
533 | { |
534 | struct metapage *mp; | |
b964638f | 535 | int ret = 1; |
7fab479b DK |
536 | unsigned int offset; |
537 | ||
538 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
539 | mp = page_to_mp(page, offset); | |
540 | ||
541 | if (!mp) | |
542 | continue; | |
543 | ||
544 | jfs_info("metapage_releasepage: mp = 0x%p", mp); | |
b964638f DK |
545 | if (mp->count || mp->nohomeok || |
546 | test_bit(META_dirty, &mp->flag)) { | |
7fab479b DK |
547 | jfs_info("count = %ld, nohomeok = %d", mp->count, |
548 | mp->nohomeok); | |
b964638f | 549 | ret = 0; |
7fab479b DK |
550 | continue; |
551 | } | |
7fab479b DK |
552 | if (mp->lsn) |
553 | remove_from_logsync(mp); | |
554 | remove_metapage(page, mp); | |
555 | INCREMENT(mpStat.pagefree); | |
556 | free_metapage(mp); | |
557 | } | |
b964638f | 558 | return ret; |
7fab479b DK |
559 | } |
560 | ||
2ff28e22 | 561 | static void metapage_invalidatepage(struct page *page, unsigned long offset) |
7fab479b DK |
562 | { |
563 | BUG_ON(offset); | |
564 | ||
2ff28e22 | 565 | BUG_ON(PageWriteback(page)); |
7fab479b | 566 | |
2ff28e22 | 567 | metapage_releasepage(page, 0); |
7fab479b DK |
568 | } |
569 | ||
f5e54d6e | 570 | const struct address_space_operations jfs_metapage_aops = { |
7fab479b DK |
571 | .readpage = metapage_readpage, |
572 | .writepage = metapage_writepage, | |
573 | .sync_page = block_sync_page, | |
574 | .releasepage = metapage_releasepage, | |
575 | .invalidatepage = metapage_invalidatepage, | |
576 | .set_page_dirty = __set_page_dirty_nobuffers, | |
577 | }; | |
578 | ||
1da177e4 LT |
579 | struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, |
580 | unsigned int size, int absolute, | |
581 | unsigned long new) | |
582 | { | |
1da177e4 LT |
583 | int l2BlocksPerPage; |
584 | int l2bsize; | |
585 | struct address_space *mapping; | |
7fab479b DK |
586 | struct metapage *mp = NULL; |
587 | struct page *page; | |
1da177e4 LT |
588 | unsigned long page_index; |
589 | unsigned long page_offset; | |
590 | ||
7fab479b DK |
591 | jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d", |
592 | inode->i_ino, lblock, absolute); | |
593 | ||
594 | l2bsize = inode->i_blkbits; | |
595 | l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize; | |
596 | page_index = lblock >> l2BlocksPerPage; | |
597 | page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; | |
598 | if ((page_offset + size) > PAGE_CACHE_SIZE) { | |
599 | jfs_err("MetaData crosses page boundary!!"); | |
600 | jfs_err("lblock = %lx, size = %d", lblock, size); | |
601 | dump_stack(); | |
602 | return NULL; | |
603 | } | |
1da177e4 | 604 | if (absolute) |
7fab479b | 605 | mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping; |
1da177e4 LT |
606 | else { |
607 | /* | |
608 | * If an nfs client tries to read an inode that is larger | |
609 | * than any existing inodes, we may try to read past the | |
610 | * end of the inode map | |
611 | */ | |
612 | if ((lblock << inode->i_blkbits) >= inode->i_size) | |
613 | return NULL; | |
614 | mapping = inode->i_mapping; | |
615 | } | |
616 | ||
7fab479b DK |
617 | if (new && (PSIZE == PAGE_CACHE_SIZE)) { |
618 | page = grab_cache_page(mapping, page_index); | |
619 | if (!page) { | |
620 | jfs_err("grab_cache_page failed!"); | |
621 | return NULL; | |
622 | } | |
623 | SetPageUptodate(page); | |
624 | } else { | |
090d2b18 | 625 | page = read_mapping_page(mapping, page_index, NULL); |
c40c2024 | 626 | if (IS_ERR(page) || !PageUptodate(page)) { |
090d2b18 | 627 | jfs_err("read_mapping_page failed!"); |
7fab479b DK |
628 | return NULL; |
629 | } | |
630 | lock_page(page); | |
631 | } | |
632 | ||
633 | mp = page_to_mp(page, page_offset); | |
1da177e4 | 634 | if (mp) { |
7fab479b DK |
635 | if (mp->logical_size != size) { |
636 | jfs_error(inode->i_sb, | |
637 | "__get_metapage: mp->logical_size != size"); | |
638 | jfs_err("logical_size = %d, size = %d", | |
639 | mp->logical_size, size); | |
640 | dump_stack(); | |
63f83c9f | 641 | goto unlock; |
1da177e4 LT |
642 | } |
643 | mp->count++; | |
644 | lock_metapage(mp); | |
1da177e4 LT |
645 | if (test_bit(META_discard, &mp->flag)) { |
646 | if (!new) { | |
647 | jfs_error(inode->i_sb, | |
648 | "__get_metapage: using a " | |
649 | "discarded metapage"); | |
7fab479b | 650 | discard_metapage(mp); |
63f83c9f | 651 | goto unlock; |
1da177e4 LT |
652 | } |
653 | clear_bit(META_discard, &mp->flag); | |
654 | } | |
1da177e4 | 655 | } else { |
7fab479b DK |
656 | INCREMENT(mpStat.pagealloc); |
657 | mp = alloc_metapage(GFP_NOFS); | |
658 | mp->page = page; | |
1da177e4 | 659 | mp->flag = 0; |
1da177e4 LT |
660 | mp->xflag = COMMIT_PAGE; |
661 | mp->count = 1; | |
7fab479b | 662 | mp->nohomeok = 0; |
1da177e4 | 663 | mp->logical_size = size; |
7fab479b DK |
664 | mp->data = page_address(page) + page_offset; |
665 | mp->index = lblock; | |
666 | if (unlikely(insert_metapage(page, mp))) { | |
667 | free_metapage(mp); | |
668 | goto unlock; | |
1da177e4 | 669 | } |
7fab479b | 670 | lock_metapage(mp); |
1da177e4 LT |
671 | } |
672 | ||
7fab479b DK |
673 | if (new) { |
674 | jfs_info("zeroing mp = 0x%p", mp); | |
1da177e4 | 675 | memset(mp->data, 0, PSIZE); |
7fab479b | 676 | } |
1da177e4 | 677 | |
7fab479b DK |
678 | unlock_page(page); |
679 | jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data); | |
1da177e4 LT |
680 | return mp; |
681 | ||
7fab479b DK |
682 | unlock: |
683 | unlock_page(page); | |
1da177e4 LT |
684 | return NULL; |
685 | } | |
686 | ||
7fab479b | 687 | void grab_metapage(struct metapage * mp) |
1da177e4 | 688 | { |
7fab479b DK |
689 | jfs_info("grab_metapage: mp = 0x%p", mp); |
690 | page_cache_get(mp->page); | |
691 | lock_page(mp->page); | |
1da177e4 | 692 | mp->count++; |
7fab479b DK |
693 | lock_metapage(mp); |
694 | unlock_page(mp->page); | |
1da177e4 LT |
695 | } |
696 | ||
7fab479b | 697 | void force_metapage(struct metapage *mp) |
1da177e4 | 698 | { |
7fab479b DK |
699 | struct page *page = mp->page; |
700 | jfs_info("force_metapage: mp = 0x%p", mp); | |
701 | set_bit(META_forcewrite, &mp->flag); | |
702 | clear_bit(META_sync, &mp->flag); | |
703 | page_cache_get(page); | |
704 | lock_page(page); | |
705 | set_page_dirty(page); | |
706 | write_one_page(page, 1); | |
707 | clear_bit(META_forcewrite, &mp->flag); | |
708 | page_cache_release(page); | |
709 | } | |
1da177e4 | 710 | |
1868f4aa | 711 | void hold_metapage(struct metapage *mp) |
7fab479b | 712 | { |
1da177e4 | 713 | lock_page(mp->page); |
7fab479b DK |
714 | } |
715 | ||
1868f4aa | 716 | void put_metapage(struct metapage *mp) |
7fab479b DK |
717 | { |
718 | if (mp->count || mp->nohomeok) { | |
719 | /* Someone else will release this */ | |
1da177e4 | 720 | unlock_page(mp->page); |
1da177e4 LT |
721 | return; |
722 | } | |
7fab479b DK |
723 | page_cache_get(mp->page); |
724 | mp->count++; | |
725 | lock_metapage(mp); | |
1da177e4 | 726 | unlock_page(mp->page); |
7fab479b | 727 | release_metapage(mp); |
1da177e4 LT |
728 | } |
729 | ||
730 | void release_metapage(struct metapage * mp) | |
731 | { | |
7fab479b | 732 | struct page *page = mp->page; |
1da177e4 LT |
733 | jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag); |
734 | ||
7fab479b DK |
735 | BUG_ON(!page); |
736 | ||
737 | lock_page(page); | |
738 | unlock_metapage(mp); | |
1da177e4 LT |
739 | |
740 | assert(mp->count); | |
7fab479b DK |
741 | if (--mp->count || mp->nohomeok) { |
742 | unlock_page(page); | |
743 | page_cache_release(page); | |
1da177e4 LT |
744 | return; |
745 | } | |
746 | ||
7fab479b DK |
747 | if (test_bit(META_dirty, &mp->flag)) { |
748 | set_page_dirty(page); | |
1da177e4 | 749 | if (test_bit(META_sync, &mp->flag)) { |
1da177e4 | 750 | clear_bit(META_sync, &mp->flag); |
7fab479b DK |
751 | write_one_page(page, 1); |
752 | lock_page(page); /* write_one_page unlocks the page */ | |
1da177e4 | 753 | } |
7fab479b DK |
754 | } else if (mp->lsn) /* discard_metapage doesn't remove it */ |
755 | remove_from_logsync(mp); | |
1da177e4 | 756 | |
7fab479b DK |
757 | /* Try to keep metapages from using up too much memory */ |
758 | drop_metapage(page, mp); | |
d0e671a9 | 759 | |
7fab479b DK |
760 | unlock_page(page); |
761 | page_cache_release(page); | |
1da177e4 LT |
762 | } |
763 | ||
764 | void __invalidate_metapages(struct inode *ip, s64 addr, int len) | |
765 | { | |
7fab479b | 766 | sector_t lblock; |
1da177e4 | 767 | int l2BlocksPerPage = PAGE_CACHE_SHIFT - ip->i_blkbits; |
7fab479b | 768 | int BlocksPerPage = 1 << l2BlocksPerPage; |
1da177e4 | 769 | /* All callers are interested in block device's mapping */ |
7fab479b DK |
770 | struct address_space *mapping = |
771 | JFS_SBI(ip->i_sb)->direct_inode->i_mapping; | |
1da177e4 LT |
772 | struct metapage *mp; |
773 | struct page *page; | |
7fab479b | 774 | unsigned int offset; |
1da177e4 LT |
775 | |
776 | /* | |
7fab479b | 777 | * Mark metapages to discard. They will eventually be |
1da177e4 LT |
778 | * released, but should not be written. |
779 | */ | |
7fab479b DK |
780 | for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len; |
781 | lblock += BlocksPerPage) { | |
782 | page = find_lock_page(mapping, lblock >> l2BlocksPerPage); | |
783 | if (!page) | |
784 | continue; | |
785 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
786 | mp = page_to_mp(page, offset); | |
787 | if (!mp) | |
788 | continue; | |
789 | if (mp->index < addr) | |
790 | continue; | |
791 | if (mp->index >= addr + len) | |
792 | break; | |
1da177e4 LT |
793 | |
794 | clear_bit(META_dirty, &mp->flag); | |
795 | set_bit(META_discard, &mp->flag); | |
7fab479b DK |
796 | if (mp->lsn) |
797 | remove_from_logsync(mp); | |
1da177e4 | 798 | } |
7fab479b DK |
799 | unlock_page(page); |
800 | page_cache_release(page); | |
1da177e4 LT |
801 | } |
802 | } | |
803 | ||
804 | #ifdef CONFIG_JFS_STATISTICS | |
805 | int jfs_mpstat_read(char *buffer, char **start, off_t offset, int length, | |
806 | int *eof, void *data) | |
807 | { | |
808 | int len = 0; | |
809 | off_t begin; | |
810 | ||
811 | len += sprintf(buffer, | |
812 | "JFS Metapage statistics\n" | |
813 | "=======================\n" | |
814 | "page allocations = %d\n" | |
815 | "page frees = %d\n" | |
816 | "lock waits = %d\n", | |
817 | mpStat.pagealloc, | |
818 | mpStat.pagefree, | |
819 | mpStat.lockwait); | |
820 | ||
821 | begin = offset; | |
822 | *start = buffer + begin; | |
823 | len -= begin; | |
824 | ||
825 | if (len > length) | |
826 | len = length; | |
827 | else | |
828 | *eof = 1; | |
829 | ||
830 | if (len < 0) | |
831 | len = 0; | |
832 | ||
833 | return len; | |
834 | } | |
835 | #endif |