Commit | Line | Data |
---|---|---|
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 | 21 | #include <linux/mm.h> |
b2e03ca7 | 22 | #include <linux/module.h> |
7fab479b | 23 | #include <linux/bio.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/buffer_head.h> | |
26 | #include <linux/mempool.h> | |
b2e03ca7 | 27 | #include <linux/seq_file.h> |
1da177e4 LT |
28 | #include "jfs_incore.h" |
29 | #include "jfs_superblock.h" | |
30 | #include "jfs_filsys.h" | |
31 | #include "jfs_metapage.h" | |
32 | #include "jfs_txnmgr.h" | |
33 | #include "jfs_debug.h" | |
34 | ||
1da177e4 LT |
35 | #ifdef CONFIG_JFS_STATISTICS |
36 | static struct { | |
37 | uint pagealloc; /* # of page allocations */ | |
38 | uint pagefree; /* # of page frees */ | |
39 | uint lockwait; /* # of sleeping lock_metapage() calls */ | |
40 | } mpStat; | |
41 | #endif | |
42 | ||
7fab479b | 43 | #define metapage_locked(mp) test_bit(META_locked, &(mp)->flag) |
54af6233 | 44 | #define trylock_metapage(mp) test_and_set_bit_lock(META_locked, &(mp)->flag) |
1da177e4 LT |
45 | |
46 | static inline void unlock_metapage(struct metapage *mp) | |
47 | { | |
54af6233 | 48 | clear_bit_unlock(META_locked, &mp->flag); |
1da177e4 LT |
49 | wake_up(&mp->wait); |
50 | } | |
51 | ||
7fab479b | 52 | static inline void __lock_metapage(struct metapage *mp) |
1da177e4 LT |
53 | { |
54 | DECLARE_WAITQUEUE(wait, current); | |
1da177e4 | 55 | INCREMENT(mpStat.lockwait); |
1da177e4 LT |
56 | add_wait_queue_exclusive(&mp->wait, &wait); |
57 | do { | |
58 | set_current_state(TASK_UNINTERRUPTIBLE); | |
59 | if (metapage_locked(mp)) { | |
7fab479b | 60 | unlock_page(mp->page); |
4aa0d230 | 61 | io_schedule(); |
7fab479b | 62 | lock_page(mp->page); |
1da177e4 LT |
63 | } |
64 | } while (trylock_metapage(mp)); | |
65 | __set_current_state(TASK_RUNNING); | |
66 | remove_wait_queue(&mp->wait, &wait); | |
67 | } | |
68 | ||
7fab479b DK |
69 | /* |
70 | * Must have mp->page locked | |
71 | */ | |
1da177e4 LT |
72 | static inline void lock_metapage(struct metapage *mp) |
73 | { | |
74 | if (trylock_metapage(mp)) | |
75 | __lock_metapage(mp); | |
76 | } | |
77 | ||
78 | #define METAPOOL_MIN_PAGES 32 | |
e18b890b | 79 | static struct kmem_cache *metapage_cache; |
1da177e4 LT |
80 | static mempool_t *metapage_mempool; |
81 | ||
7fab479b DK |
82 | #define MPS_PER_PAGE (PAGE_CACHE_SIZE >> L2PSIZE) |
83 | ||
84 | #if MPS_PER_PAGE > 1 | |
85 | ||
86 | struct meta_anchor { | |
87 | int mp_count; | |
88 | atomic_t io_count; | |
89 | struct metapage *mp[MPS_PER_PAGE]; | |
90 | }; | |
4c21e2f2 | 91 | #define mp_anchor(page) ((struct meta_anchor *)page_private(page)) |
7fab479b | 92 | |
967c9ec4 | 93 | static inline struct metapage *page_to_mp(struct page *page, int offset) |
7fab479b DK |
94 | { |
95 | if (!PagePrivate(page)) | |
96 | return NULL; | |
97 | return mp_anchor(page)->mp[offset >> L2PSIZE]; | |
98 | } | |
99 | ||
100 | static inline int insert_metapage(struct page *page, struct metapage *mp) | |
101 | { | |
102 | struct meta_anchor *a; | |
103 | int index; | |
104 | int l2mp_blocks; /* log2 blocks per metapage */ | |
105 | ||
106 | if (PagePrivate(page)) | |
107 | a = mp_anchor(page); | |
108 | else { | |
5b3030e3 | 109 | a = kzalloc(sizeof(struct meta_anchor), GFP_NOFS); |
7fab479b DK |
110 | if (!a) |
111 | return -ENOMEM; | |
4c21e2f2 | 112 | set_page_private(page, (unsigned long)a); |
7fab479b DK |
113 | SetPagePrivate(page); |
114 | kmap(page); | |
115 | } | |
116 | ||
117 | if (mp) { | |
118 | l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; | |
119 | index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); | |
120 | a->mp_count++; | |
121 | a->mp[index] = mp; | |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static inline void remove_metapage(struct page *page, struct metapage *mp) | |
128 | { | |
129 | struct meta_anchor *a = mp_anchor(page); | |
130 | int l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; | |
131 | int index; | |
132 | ||
133 | index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); | |
134 | ||
135 | BUG_ON(a->mp[index] != mp); | |
136 | ||
137 | a->mp[index] = NULL; | |
138 | if (--a->mp_count == 0) { | |
139 | kfree(a); | |
4c21e2f2 | 140 | set_page_private(page, 0); |
7fab479b DK |
141 | ClearPagePrivate(page); |
142 | kunmap(page); | |
143 | } | |
144 | } | |
145 | ||
146 | static inline void inc_io(struct page *page) | |
147 | { | |
148 | atomic_inc(&mp_anchor(page)->io_count); | |
149 | } | |
150 | ||
151 | static inline void dec_io(struct page *page, void (*handler) (struct page *)) | |
152 | { | |
153 | if (atomic_dec_and_test(&mp_anchor(page)->io_count)) | |
154 | handler(page); | |
155 | } | |
156 | ||
157 | #else | |
967c9ec4 | 158 | static inline struct metapage *page_to_mp(struct page *page, int offset) |
7fab479b | 159 | { |
4c21e2f2 | 160 | return PagePrivate(page) ? (struct metapage *)page_private(page) : NULL; |
7fab479b DK |
161 | } |
162 | ||
163 | static inline int insert_metapage(struct page *page, struct metapage *mp) | |
164 | { | |
165 | if (mp) { | |
4c21e2f2 | 166 | set_page_private(page, (unsigned long)mp); |
7fab479b DK |
167 | SetPagePrivate(page); |
168 | kmap(page); | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static inline void remove_metapage(struct page *page, struct metapage *mp) | |
174 | { | |
4c21e2f2 | 175 | set_page_private(page, 0); |
7fab479b DK |
176 | ClearPagePrivate(page); |
177 | kunmap(page); | |
178 | } | |
179 | ||
180 | #define inc_io(page) do {} while(0) | |
181 | #define dec_io(page, handler) handler(page) | |
182 | ||
183 | #endif | |
184 | ||
51cc5068 | 185 | static void init_once(void *foo) |
1da177e4 LT |
186 | { |
187 | struct metapage *mp = (struct metapage *)foo; | |
188 | ||
a35afb83 CL |
189 | mp->lid = 0; |
190 | mp->lsn = 0; | |
191 | mp->flag = 0; | |
192 | mp->data = NULL; | |
193 | mp->clsn = 0; | |
194 | mp->log = NULL; | |
195 | set_bit(META_free, &mp->flag); | |
196 | init_waitqueue_head(&mp->wait); | |
1da177e4 LT |
197 | } |
198 | ||
27496a8c | 199 | static inline struct metapage *alloc_metapage(gfp_t gfp_mask) |
1da177e4 LT |
200 | { |
201 | return mempool_alloc(metapage_mempool, gfp_mask); | |
202 | } | |
203 | ||
204 | static inline void free_metapage(struct metapage *mp) | |
205 | { | |
206 | mp->flag = 0; | |
207 | set_bit(META_free, &mp->flag); | |
208 | ||
209 | mempool_free(mp, metapage_mempool); | |
210 | } | |
211 | ||
212 | int __init metapage_init(void) | |
213 | { | |
214 | /* | |
215 | * Allocate the metapage structures | |
216 | */ | |
217 | metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage), | |
20c2df83 | 218 | 0, 0, init_once); |
1da177e4 LT |
219 | if (metapage_cache == NULL) |
220 | return -ENOMEM; | |
221 | ||
93d2341c MD |
222 | metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES, |
223 | metapage_cache); | |
1da177e4 LT |
224 | |
225 | if (metapage_mempool == NULL) { | |
226 | kmem_cache_destroy(metapage_cache); | |
227 | return -ENOMEM; | |
228 | } | |
1da177e4 LT |
229 | |
230 | return 0; | |
231 | } | |
232 | ||
233 | void metapage_exit(void) | |
234 | { | |
235 | mempool_destroy(metapage_mempool); | |
236 | kmem_cache_destroy(metapage_cache); | |
237 | } | |
238 | ||
7fab479b DK |
239 | static inline void drop_metapage(struct page *page, struct metapage *mp) |
240 | { | |
241 | if (mp->count || mp->nohomeok || test_bit(META_dirty, &mp->flag) || | |
242 | test_bit(META_io, &mp->flag)) | |
243 | return; | |
244 | remove_metapage(page, mp); | |
245 | INCREMENT(mpStat.pagefree); | |
246 | free_metapage(mp); | |
247 | } | |
248 | ||
1da177e4 | 249 | /* |
7fab479b | 250 | * Metapage address space operations |
1da177e4 | 251 | */ |
7fab479b DK |
252 | |
253 | static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock, | |
967c9ec4 | 254 | int *len) |
1da177e4 | 255 | { |
7fab479b DK |
256 | int rc = 0; |
257 | int xflag; | |
258 | s64 xaddr; | |
ba52de12 | 259 | sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
7fab479b DK |
260 | inode->i_blkbits; |
261 | ||
262 | if (lblock >= file_blocks) | |
263 | return 0; | |
264 | if (lblock + *len > file_blocks) | |
265 | *len = file_blocks - lblock; | |
266 | ||
267 | if (inode->i_ino) { | |
268 | rc = xtLookup(inode, (s64)lblock, *len, &xflag, &xaddr, len, 0); | |
269 | if ((rc == 0) && *len) | |
270 | lblock = (sector_t)xaddr; | |
271 | else | |
272 | lblock = 0; | |
273 | } /* else no mapping */ | |
274 | ||
275 | return lblock; | |
1da177e4 LT |
276 | } |
277 | ||
7fab479b | 278 | static void last_read_complete(struct page *page) |
1da177e4 | 279 | { |
7fab479b DK |
280 | if (!PageError(page)) |
281 | SetPageUptodate(page); | |
282 | unlock_page(page); | |
283 | } | |
284 | ||
6712ecf8 | 285 | static void metapage_read_end_io(struct bio *bio, int err) |
7fab479b DK |
286 | { |
287 | struct page *page = bio->bi_private; | |
288 | ||
7fab479b DK |
289 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
290 | printk(KERN_ERR "metapage_read_end_io: I/O error\n"); | |
291 | SetPageError(page); | |
1da177e4 LT |
292 | } |
293 | ||
7fab479b DK |
294 | dec_io(page, last_read_complete); |
295 | bio_put(bio); | |
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); | |
7fab479b DK |
352 | } |
353 | ||
354 | static int metapage_writepage(struct page *page, struct writeback_control *wbc) | |
355 | { | |
356 | struct bio *bio = NULL; | |
967c9ec4 | 357 | int block_offset; /* block offset of mp within page */ |
7fab479b | 358 | struct inode *inode = page->mapping->host; |
967c9ec4 DK |
359 | int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage; |
360 | int len; | |
361 | int xlen; | |
7fab479b DK |
362 | struct metapage *mp; |
363 | int redirty = 0; | |
364 | sector_t lblock; | |
29a424f2 | 365 | int nr_underway = 0; |
7fab479b DK |
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; | |
967c9ec4 | 371 | int offset; |
1ad53a98 | 372 | int bad_blocks = 0; |
7fab479b DK |
373 | |
374 | page_start = (sector_t)page->index << | |
375 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
376 | BUG_ON(!PageLocked(page)); | |
377 | BUG_ON(PageWriteback(page)); | |
29a424f2 | 378 | set_page_writeback(page); |
7fab479b DK |
379 | |
380 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
381 | mp = page_to_mp(page, offset); | |
382 | ||
383 | if (!mp || !test_bit(META_dirty, &mp->flag)) | |
384 | continue; | |
385 | ||
386 | if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) { | |
387 | redirty = 1; | |
ac17b8b5 DK |
388 | /* |
389 | * Make sure this page isn't blocked indefinitely. | |
390 | * If the journal isn't undergoing I/O, push it | |
391 | */ | |
392 | if (mp->log && !(mp->log->cflag & logGC_PAGEOUT)) | |
393 | jfs_flush_journal(mp->log, 0); | |
7fab479b DK |
394 | continue; |
395 | } | |
396 | ||
397 | clear_bit(META_dirty, &mp->flag); | |
1ad53a98 | 398 | set_bit(META_io, &mp->flag); |
7fab479b DK |
399 | block_offset = offset >> inode->i_blkbits; |
400 | lblock = page_start + block_offset; | |
401 | if (bio) { | |
402 | if (xlen && lblock == next_block) { | |
403 | /* Contiguous, in memory & on disk */ | |
404 | len = min(xlen, blocks_per_mp); | |
405 | xlen -= len; | |
406 | bio_bytes += len << inode->i_blkbits; | |
7fab479b DK |
407 | continue; |
408 | } | |
409 | /* Not contiguous */ | |
410 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < | |
411 | bio_bytes) | |
412 | goto add_failed; | |
413 | /* | |
414 | * Increment counter before submitting i/o to keep | |
415 | * count from hitting zero before we're through | |
416 | */ | |
417 | inc_io(page); | |
418 | if (!bio->bi_size) | |
419 | goto dump_bio; | |
420 | submit_bio(WRITE, bio); | |
29a424f2 | 421 | nr_underway++; |
7fab479b | 422 | bio = NULL; |
29a424f2 | 423 | } else |
7fab479b | 424 | inc_io(page); |
7fab479b DK |
425 | xlen = (PAGE_CACHE_SIZE - offset) >> inode->i_blkbits; |
426 | pblock = metapage_get_blocks(inode, lblock, &xlen); | |
427 | if (!pblock) { | |
7fab479b | 428 | printk(KERN_ERR "JFS: metapage_get_blocks failed\n"); |
1ad53a98 DK |
429 | /* |
430 | * We already called inc_io(), but can't cancel it | |
431 | * with dec_io() until we're done with the page | |
432 | */ | |
433 | bad_blocks++; | |
7fab479b DK |
434 | continue; |
435 | } | |
967c9ec4 | 436 | len = min(xlen, (int)JFS_SBI(inode->i_sb)->nbperpage); |
7fab479b DK |
437 | |
438 | bio = bio_alloc(GFP_NOFS, 1); | |
439 | bio->bi_bdev = inode->i_sb->s_bdev; | |
440 | bio->bi_sector = pblock << (inode->i_blkbits - 9); | |
441 | bio->bi_end_io = metapage_write_end_io; | |
442 | bio->bi_private = page; | |
443 | ||
444 | /* Don't call bio_add_page yet, we may add to this vec */ | |
445 | bio_offset = offset; | |
446 | bio_bytes = len << inode->i_blkbits; | |
447 | ||
448 | xlen -= len; | |
449 | next_block = lblock + len; | |
450 | } | |
451 | if (bio) { | |
452 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes) | |
453 | goto add_failed; | |
454 | if (!bio->bi_size) | |
455 | goto dump_bio; | |
63f83c9f | 456 | |
7fab479b | 457 | submit_bio(WRITE, bio); |
29a424f2 | 458 | nr_underway++; |
7fab479b DK |
459 | } |
460 | if (redirty) | |
461 | redirty_page_for_writepage(wbc, page); | |
462 | ||
463 | unlock_page(page); | |
464 | ||
1ad53a98 DK |
465 | if (bad_blocks) |
466 | goto err_out; | |
467 | ||
29a424f2 DK |
468 | if (nr_underway == 0) |
469 | end_page_writeback(page); | |
470 | ||
7fab479b DK |
471 | return 0; |
472 | add_failed: | |
473 | /* We should never reach here, since we're only adding one vec */ | |
474 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
475 | goto skip; | |
476 | dump_bio: | |
288e4d83 DK |
477 | print_hex_dump(KERN_ERR, "JFS: dump of bio: ", DUMP_PREFIX_ADDRESS, 16, |
478 | 4, bio, sizeof(*bio), 0); | |
7fab479b DK |
479 | skip: |
480 | bio_put(bio); | |
481 | unlock_page(page); | |
482 | dec_io(page, last_write_complete); | |
1ad53a98 DK |
483 | err_out: |
484 | while (bad_blocks--) | |
485 | dec_io(page, last_write_complete); | |
7fab479b DK |
486 | return -EIO; |
487 | } | |
488 | ||
489 | static int metapage_readpage(struct file *fp, struct page *page) | |
490 | { | |
491 | struct inode *inode = page->mapping->host; | |
492 | struct bio *bio = NULL; | |
967c9ec4 DK |
493 | int block_offset; |
494 | int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits; | |
7fab479b DK |
495 | sector_t page_start; /* address of page in fs blocks */ |
496 | sector_t pblock; | |
967c9ec4 | 497 | int xlen; |
7fab479b | 498 | unsigned int len; |
967c9ec4 | 499 | int offset; |
7fab479b DK |
500 | |
501 | BUG_ON(!PageLocked(page)); | |
502 | page_start = (sector_t)page->index << | |
503 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
504 | ||
505 | block_offset = 0; | |
506 | while (block_offset < blocks_per_page) { | |
507 | xlen = blocks_per_page - block_offset; | |
508 | pblock = metapage_get_blocks(inode, page_start + block_offset, | |
509 | &xlen); | |
510 | if (pblock) { | |
511 | if (!PagePrivate(page)) | |
512 | insert_metapage(page, NULL); | |
513 | inc_io(page); | |
514 | if (bio) | |
515 | submit_bio(READ, bio); | |
516 | ||
517 | bio = bio_alloc(GFP_NOFS, 1); | |
518 | bio->bi_bdev = inode->i_sb->s_bdev; | |
519 | bio->bi_sector = pblock << (inode->i_blkbits - 9); | |
520 | bio->bi_end_io = metapage_read_end_io; | |
521 | bio->bi_private = page; | |
522 | len = xlen << inode->i_blkbits; | |
523 | offset = block_offset << inode->i_blkbits; | |
524 | if (bio_add_page(bio, page, len, offset) < len) | |
525 | goto add_failed; | |
526 | block_offset += xlen; | |
527 | } else | |
528 | block_offset++; | |
1da177e4 | 529 | } |
7fab479b DK |
530 | if (bio) |
531 | submit_bio(READ, bio); | |
532 | else | |
533 | unlock_page(page); | |
534 | ||
535 | return 0; | |
1da177e4 | 536 | |
7fab479b DK |
537 | add_failed: |
538 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
539 | bio_put(bio); | |
540 | dec_io(page, last_read_complete); | |
541 | return -EIO; | |
1da177e4 LT |
542 | } |
543 | ||
27496a8c | 544 | static int metapage_releasepage(struct page *page, gfp_t gfp_mask) |
7fab479b DK |
545 | { |
546 | struct metapage *mp; | |
b964638f | 547 | int ret = 1; |
967c9ec4 | 548 | int offset; |
7fab479b DK |
549 | |
550 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
551 | mp = page_to_mp(page, offset); | |
552 | ||
553 | if (!mp) | |
554 | continue; | |
555 | ||
556 | jfs_info("metapage_releasepage: mp = 0x%p", mp); | |
b964638f DK |
557 | if (mp->count || mp->nohomeok || |
558 | test_bit(META_dirty, &mp->flag)) { | |
7fab479b DK |
559 | jfs_info("count = %ld, nohomeok = %d", mp->count, |
560 | mp->nohomeok); | |
b964638f | 561 | ret = 0; |
7fab479b DK |
562 | continue; |
563 | } | |
7fab479b DK |
564 | if (mp->lsn) |
565 | remove_from_logsync(mp); | |
566 | remove_metapage(page, mp); | |
567 | INCREMENT(mpStat.pagefree); | |
568 | free_metapage(mp); | |
569 | } | |
b964638f | 570 | return ret; |
7fab479b DK |
571 | } |
572 | ||
2ff28e22 | 573 | static void metapage_invalidatepage(struct page *page, unsigned long offset) |
7fab479b DK |
574 | { |
575 | BUG_ON(offset); | |
576 | ||
2ff28e22 | 577 | BUG_ON(PageWriteback(page)); |
7fab479b | 578 | |
2ff28e22 | 579 | metapage_releasepage(page, 0); |
7fab479b DK |
580 | } |
581 | ||
f5e54d6e | 582 | const struct address_space_operations jfs_metapage_aops = { |
7fab479b DK |
583 | .readpage = metapage_readpage, |
584 | .writepage = metapage_writepage, | |
585 | .sync_page = block_sync_page, | |
586 | .releasepage = metapage_releasepage, | |
587 | .invalidatepage = metapage_invalidatepage, | |
588 | .set_page_dirty = __set_page_dirty_nobuffers, | |
589 | }; | |
590 | ||
1da177e4 LT |
591 | struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, |
592 | unsigned int size, int absolute, | |
593 | unsigned long new) | |
594 | { | |
1da177e4 LT |
595 | int l2BlocksPerPage; |
596 | int l2bsize; | |
597 | struct address_space *mapping; | |
7fab479b DK |
598 | struct metapage *mp = NULL; |
599 | struct page *page; | |
1da177e4 LT |
600 | unsigned long page_index; |
601 | unsigned long page_offset; | |
602 | ||
7fab479b DK |
603 | jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d", |
604 | inode->i_ino, lblock, absolute); | |
605 | ||
606 | l2bsize = inode->i_blkbits; | |
607 | l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize; | |
608 | page_index = lblock >> l2BlocksPerPage; | |
609 | page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; | |
610 | if ((page_offset + size) > PAGE_CACHE_SIZE) { | |
611 | jfs_err("MetaData crosses page boundary!!"); | |
612 | jfs_err("lblock = %lx, size = %d", lblock, size); | |
613 | dump_stack(); | |
614 | return NULL; | |
615 | } | |
1da177e4 | 616 | if (absolute) |
7fab479b | 617 | mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping; |
1da177e4 LT |
618 | else { |
619 | /* | |
620 | * If an nfs client tries to read an inode that is larger | |
621 | * than any existing inodes, we may try to read past the | |
622 | * end of the inode map | |
623 | */ | |
624 | if ((lblock << inode->i_blkbits) >= inode->i_size) | |
625 | return NULL; | |
626 | mapping = inode->i_mapping; | |
627 | } | |
628 | ||
7fab479b DK |
629 | if (new && (PSIZE == PAGE_CACHE_SIZE)) { |
630 | page = grab_cache_page(mapping, page_index); | |
631 | if (!page) { | |
632 | jfs_err("grab_cache_page failed!"); | |
633 | return NULL; | |
634 | } | |
635 | SetPageUptodate(page); | |
636 | } else { | |
090d2b18 | 637 | page = read_mapping_page(mapping, page_index, NULL); |
c40c2024 | 638 | if (IS_ERR(page) || !PageUptodate(page)) { |
090d2b18 | 639 | jfs_err("read_mapping_page failed!"); |
7fab479b DK |
640 | return NULL; |
641 | } | |
642 | lock_page(page); | |
643 | } | |
644 | ||
645 | mp = page_to_mp(page, page_offset); | |
1da177e4 | 646 | if (mp) { |
7fab479b DK |
647 | if (mp->logical_size != size) { |
648 | jfs_error(inode->i_sb, | |
649 | "__get_metapage: mp->logical_size != size"); | |
650 | jfs_err("logical_size = %d, size = %d", | |
651 | mp->logical_size, size); | |
652 | dump_stack(); | |
63f83c9f | 653 | goto unlock; |
1da177e4 LT |
654 | } |
655 | mp->count++; | |
656 | lock_metapage(mp); | |
1da177e4 LT |
657 | if (test_bit(META_discard, &mp->flag)) { |
658 | if (!new) { | |
659 | jfs_error(inode->i_sb, | |
660 | "__get_metapage: using a " | |
661 | "discarded metapage"); | |
7fab479b | 662 | discard_metapage(mp); |
63f83c9f | 663 | goto unlock; |
1da177e4 LT |
664 | } |
665 | clear_bit(META_discard, &mp->flag); | |
666 | } | |
1da177e4 | 667 | } else { |
7fab479b DK |
668 | INCREMENT(mpStat.pagealloc); |
669 | mp = alloc_metapage(GFP_NOFS); | |
670 | mp->page = page; | |
1da177e4 | 671 | mp->flag = 0; |
1da177e4 LT |
672 | mp->xflag = COMMIT_PAGE; |
673 | mp->count = 1; | |
7fab479b | 674 | mp->nohomeok = 0; |
1da177e4 | 675 | mp->logical_size = size; |
7fab479b DK |
676 | mp->data = page_address(page) + page_offset; |
677 | mp->index = lblock; | |
678 | if (unlikely(insert_metapage(page, mp))) { | |
679 | free_metapage(mp); | |
680 | goto unlock; | |
1da177e4 | 681 | } |
7fab479b | 682 | lock_metapage(mp); |
1da177e4 LT |
683 | } |
684 | ||
7fab479b DK |
685 | if (new) { |
686 | jfs_info("zeroing mp = 0x%p", mp); | |
1da177e4 | 687 | memset(mp->data, 0, PSIZE); |
7fab479b | 688 | } |
1da177e4 | 689 | |
7fab479b DK |
690 | unlock_page(page); |
691 | jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data); | |
1da177e4 LT |
692 | return mp; |
693 | ||
7fab479b DK |
694 | unlock: |
695 | unlock_page(page); | |
1da177e4 LT |
696 | return NULL; |
697 | } | |
698 | ||
7fab479b | 699 | void grab_metapage(struct metapage * mp) |
1da177e4 | 700 | { |
7fab479b DK |
701 | jfs_info("grab_metapage: mp = 0x%p", mp); |
702 | page_cache_get(mp->page); | |
703 | lock_page(mp->page); | |
1da177e4 | 704 | mp->count++; |
7fab479b DK |
705 | lock_metapage(mp); |
706 | unlock_page(mp->page); | |
1da177e4 LT |
707 | } |
708 | ||
7fab479b | 709 | void force_metapage(struct metapage *mp) |
1da177e4 | 710 | { |
7fab479b DK |
711 | struct page *page = mp->page; |
712 | jfs_info("force_metapage: mp = 0x%p", mp); | |
713 | set_bit(META_forcewrite, &mp->flag); | |
714 | clear_bit(META_sync, &mp->flag); | |
715 | page_cache_get(page); | |
716 | lock_page(page); | |
717 | set_page_dirty(page); | |
718 | write_one_page(page, 1); | |
719 | clear_bit(META_forcewrite, &mp->flag); | |
720 | page_cache_release(page); | |
721 | } | |
1da177e4 | 722 | |
1868f4aa | 723 | void hold_metapage(struct metapage *mp) |
7fab479b | 724 | { |
1da177e4 | 725 | lock_page(mp->page); |
7fab479b DK |
726 | } |
727 | ||
1868f4aa | 728 | void put_metapage(struct metapage *mp) |
7fab479b DK |
729 | { |
730 | if (mp->count || mp->nohomeok) { | |
731 | /* Someone else will release this */ | |
1da177e4 | 732 | unlock_page(mp->page); |
1da177e4 LT |
733 | return; |
734 | } | |
7fab479b DK |
735 | page_cache_get(mp->page); |
736 | mp->count++; | |
737 | lock_metapage(mp); | |
1da177e4 | 738 | unlock_page(mp->page); |
7fab479b | 739 | release_metapage(mp); |
1da177e4 LT |
740 | } |
741 | ||
742 | void release_metapage(struct metapage * mp) | |
743 | { | |
7fab479b | 744 | struct page *page = mp->page; |
1da177e4 LT |
745 | jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag); |
746 | ||
7fab479b DK |
747 | BUG_ON(!page); |
748 | ||
749 | lock_page(page); | |
750 | unlock_metapage(mp); | |
1da177e4 LT |
751 | |
752 | assert(mp->count); | |
7fab479b DK |
753 | if (--mp->count || mp->nohomeok) { |
754 | unlock_page(page); | |
755 | page_cache_release(page); | |
1da177e4 LT |
756 | return; |
757 | } | |
758 | ||
7fab479b DK |
759 | if (test_bit(META_dirty, &mp->flag)) { |
760 | set_page_dirty(page); | |
1da177e4 | 761 | if (test_bit(META_sync, &mp->flag)) { |
1da177e4 | 762 | clear_bit(META_sync, &mp->flag); |
7fab479b DK |
763 | write_one_page(page, 1); |
764 | lock_page(page); /* write_one_page unlocks the page */ | |
1da177e4 | 765 | } |
7fab479b DK |
766 | } else if (mp->lsn) /* discard_metapage doesn't remove it */ |
767 | remove_from_logsync(mp); | |
1da177e4 | 768 | |
7fab479b DK |
769 | /* Try to keep metapages from using up too much memory */ |
770 | drop_metapage(page, mp); | |
d0e671a9 | 771 | |
7fab479b DK |
772 | unlock_page(page); |
773 | page_cache_release(page); | |
1da177e4 LT |
774 | } |
775 | ||
776 | void __invalidate_metapages(struct inode *ip, s64 addr, int len) | |
777 | { | |
7fab479b | 778 | sector_t lblock; |
1da177e4 | 779 | int l2BlocksPerPage = PAGE_CACHE_SHIFT - ip->i_blkbits; |
7fab479b | 780 | int BlocksPerPage = 1 << l2BlocksPerPage; |
1da177e4 | 781 | /* All callers are interested in block device's mapping */ |
7fab479b DK |
782 | struct address_space *mapping = |
783 | JFS_SBI(ip->i_sb)->direct_inode->i_mapping; | |
1da177e4 LT |
784 | struct metapage *mp; |
785 | struct page *page; | |
7fab479b | 786 | unsigned int offset; |
1da177e4 LT |
787 | |
788 | /* | |
7fab479b | 789 | * Mark metapages to discard. They will eventually be |
1da177e4 LT |
790 | * released, but should not be written. |
791 | */ | |
7fab479b DK |
792 | for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len; |
793 | lblock += BlocksPerPage) { | |
794 | page = find_lock_page(mapping, lblock >> l2BlocksPerPage); | |
795 | if (!page) | |
796 | continue; | |
797 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
798 | mp = page_to_mp(page, offset); | |
799 | if (!mp) | |
800 | continue; | |
801 | if (mp->index < addr) | |
802 | continue; | |
803 | if (mp->index >= addr + len) | |
804 | break; | |
1da177e4 LT |
805 | |
806 | clear_bit(META_dirty, &mp->flag); | |
807 | set_bit(META_discard, &mp->flag); | |
7fab479b DK |
808 | if (mp->lsn) |
809 | remove_from_logsync(mp); | |
1da177e4 | 810 | } |
7fab479b DK |
811 | unlock_page(page); |
812 | page_cache_release(page); | |
1da177e4 LT |
813 | } |
814 | } | |
815 | ||
816 | #ifdef CONFIG_JFS_STATISTICS | |
b2e03ca7 | 817 | static int jfs_mpstat_proc_show(struct seq_file *m, void *v) |
1da177e4 | 818 | { |
b2e03ca7 | 819 | seq_printf(m, |
1da177e4 LT |
820 | "JFS Metapage statistics\n" |
821 | "=======================\n" | |
822 | "page allocations = %d\n" | |
823 | "page frees = %d\n" | |
824 | "lock waits = %d\n", | |
825 | mpStat.pagealloc, | |
826 | mpStat.pagefree, | |
827 | mpStat.lockwait); | |
b2e03ca7 AD |
828 | return 0; |
829 | } | |
1da177e4 | 830 | |
b2e03ca7 AD |
831 | static int jfs_mpstat_proc_open(struct inode *inode, struct file *file) |
832 | { | |
833 | return single_open(file, jfs_mpstat_proc_show, NULL); | |
1da177e4 | 834 | } |
b2e03ca7 AD |
835 | |
836 | const struct file_operations jfs_mpstat_proc_fops = { | |
837 | .owner = THIS_MODULE, | |
838 | .open = jfs_mpstat_proc_open, | |
839 | .read = seq_read, | |
840 | .llseek = seq_lseek, | |
841 | .release = single_release, | |
842 | }; | |
1da177e4 | 843 | #endif |