]>
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 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 | 41 | #define metapage_locked(mp) test_bit(META_locked, &(mp)->flag) |
54af6233 | 42 | #define trylock_metapage(mp) test_and_set_bit_lock(META_locked, &(mp)->flag) |
1da177e4 LT |
43 | |
44 | static inline void unlock_metapage(struct metapage *mp) | |
45 | { | |
54af6233 | 46 | clear_bit_unlock(META_locked, &mp->flag); |
1da177e4 LT |
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 | ||
4ba9b9d0 | 183 | static void init_once(struct kmem_cache *cachep, void *foo) |
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); | |
1da177e4 LT |
294 | } |
295 | ||
7fab479b | 296 | static void remove_from_logsync(struct metapage *mp) |
1da177e4 | 297 | { |
7fab479b DK |
298 | struct jfs_log *log = mp->log; |
299 | unsigned long flags; | |
300 | /* | |
301 | * This can race. Recheck that log hasn't been set to null, and after | |
302 | * acquiring logsync lock, recheck lsn | |
303 | */ | |
304 | if (!log) | |
305 | return; | |
306 | ||
307 | LOGSYNC_LOCK(log, flags); | |
308 | if (mp->lsn) { | |
309 | mp->log = NULL; | |
310 | mp->lsn = 0; | |
311 | mp->clsn = 0; | |
312 | log->count--; | |
313 | list_del(&mp->synclist); | |
314 | } | |
315 | LOGSYNC_UNLOCK(log, flags); | |
316 | } | |
1da177e4 | 317 | |
7fab479b DK |
318 | static void last_write_complete(struct page *page) |
319 | { | |
320 | struct metapage *mp; | |
321 | unsigned int offset; | |
322 | ||
323 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
324 | mp = page_to_mp(page, offset); | |
325 | if (mp && test_bit(META_io, &mp->flag)) { | |
326 | if (mp->lsn) | |
327 | remove_from_logsync(mp); | |
328 | clear_bit(META_io, &mp->flag); | |
329 | } | |
330 | /* | |
331 | * I'd like to call drop_metapage here, but I don't think it's | |
332 | * safe unless I have the page locked | |
333 | */ | |
334 | } | |
335 | end_page_writeback(page); | |
1da177e4 LT |
336 | } |
337 | ||
6712ecf8 | 338 | static void metapage_write_end_io(struct bio *bio, int err) |
1da177e4 | 339 | { |
7fab479b DK |
340 | struct page *page = bio->bi_private; |
341 | ||
342 | BUG_ON(!PagePrivate(page)); | |
343 | ||
7fab479b DK |
344 | if (! test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
345 | printk(KERN_ERR "metapage_write_end_io: I/O error\n"); | |
346 | SetPageError(page); | |
347 | } | |
348 | dec_io(page, last_write_complete); | |
349 | bio_put(bio); | |
7fab479b DK |
350 | } |
351 | ||
352 | static int metapage_writepage(struct page *page, struct writeback_control *wbc) | |
353 | { | |
354 | struct bio *bio = NULL; | |
355 | unsigned int block_offset; /* block offset of mp within page */ | |
356 | struct inode *inode = page->mapping->host; | |
357 | unsigned int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage; | |
358 | unsigned int len; | |
359 | unsigned int xlen; | |
360 | struct metapage *mp; | |
361 | int redirty = 0; | |
362 | sector_t lblock; | |
29a424f2 | 363 | int nr_underway = 0; |
7fab479b DK |
364 | sector_t pblock; |
365 | sector_t next_block = 0; | |
366 | sector_t page_start; | |
367 | unsigned long bio_bytes = 0; | |
368 | unsigned long bio_offset = 0; | |
369 | unsigned int offset; | |
370 | ||
371 | page_start = (sector_t)page->index << | |
372 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
373 | BUG_ON(!PageLocked(page)); | |
374 | BUG_ON(PageWriteback(page)); | |
29a424f2 | 375 | set_page_writeback(page); |
7fab479b DK |
376 | |
377 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
378 | mp = page_to_mp(page, offset); | |
379 | ||
380 | if (!mp || !test_bit(META_dirty, &mp->flag)) | |
381 | continue; | |
382 | ||
383 | if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) { | |
384 | redirty = 1; | |
ac17b8b5 DK |
385 | /* |
386 | * Make sure this page isn't blocked indefinitely. | |
387 | * If the journal isn't undergoing I/O, push it | |
388 | */ | |
389 | if (mp->log && !(mp->log->cflag & logGC_PAGEOUT)) | |
390 | jfs_flush_journal(mp->log, 0); | |
7fab479b DK |
391 | continue; |
392 | } | |
393 | ||
394 | clear_bit(META_dirty, &mp->flag); | |
395 | block_offset = offset >> inode->i_blkbits; | |
396 | lblock = page_start + block_offset; | |
397 | if (bio) { | |
398 | if (xlen && lblock == next_block) { | |
399 | /* Contiguous, in memory & on disk */ | |
400 | len = min(xlen, blocks_per_mp); | |
401 | xlen -= len; | |
402 | bio_bytes += len << inode->i_blkbits; | |
403 | set_bit(META_io, &mp->flag); | |
404 | continue; | |
405 | } | |
406 | /* Not contiguous */ | |
407 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < | |
408 | bio_bytes) | |
409 | goto add_failed; | |
410 | /* | |
411 | * Increment counter before submitting i/o to keep | |
412 | * count from hitting zero before we're through | |
413 | */ | |
414 | inc_io(page); | |
415 | if (!bio->bi_size) | |
416 | goto dump_bio; | |
417 | submit_bio(WRITE, bio); | |
29a424f2 | 418 | nr_underway++; |
7fab479b | 419 | bio = NULL; |
29a424f2 | 420 | } else |
7fab479b | 421 | inc_io(page); |
7fab479b DK |
422 | xlen = (PAGE_CACHE_SIZE - offset) >> inode->i_blkbits; |
423 | pblock = metapage_get_blocks(inode, lblock, &xlen); | |
424 | if (!pblock) { | |
425 | /* Need better error handling */ | |
426 | printk(KERN_ERR "JFS: metapage_get_blocks failed\n"); | |
427 | dec_io(page, last_write_complete); | |
428 | continue; | |
429 | } | |
430 | set_bit(META_io, &mp->flag); | |
431 | len = min(xlen, (uint) JFS_SBI(inode->i_sb)->nbperpage); | |
432 | ||
433 | bio = bio_alloc(GFP_NOFS, 1); | |
434 | bio->bi_bdev = inode->i_sb->s_bdev; | |
435 | bio->bi_sector = pblock << (inode->i_blkbits - 9); | |
436 | bio->bi_end_io = metapage_write_end_io; | |
437 | bio->bi_private = page; | |
438 | ||
439 | /* Don't call bio_add_page yet, we may add to this vec */ | |
440 | bio_offset = offset; | |
441 | bio_bytes = len << inode->i_blkbits; | |
442 | ||
443 | xlen -= len; | |
444 | next_block = lblock + len; | |
445 | } | |
446 | if (bio) { | |
447 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes) | |
448 | goto add_failed; | |
449 | if (!bio->bi_size) | |
450 | goto dump_bio; | |
63f83c9f | 451 | |
7fab479b | 452 | submit_bio(WRITE, bio); |
29a424f2 | 453 | nr_underway++; |
7fab479b DK |
454 | } |
455 | if (redirty) | |
456 | redirty_page_for_writepage(wbc, page); | |
457 | ||
458 | unlock_page(page); | |
459 | ||
29a424f2 DK |
460 | if (nr_underway == 0) |
461 | end_page_writeback(page); | |
462 | ||
7fab479b DK |
463 | return 0; |
464 | add_failed: | |
465 | /* We should never reach here, since we're only adding one vec */ | |
466 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
467 | goto skip; | |
468 | dump_bio: | |
288e4d83 DK |
469 | print_hex_dump(KERN_ERR, "JFS: dump of bio: ", DUMP_PREFIX_ADDRESS, 16, |
470 | 4, bio, sizeof(*bio), 0); | |
7fab479b DK |
471 | skip: |
472 | bio_put(bio); | |
473 | unlock_page(page); | |
474 | dec_io(page, last_write_complete); | |
475 | ||
476 | return -EIO; | |
477 | } | |
478 | ||
479 | static int metapage_readpage(struct file *fp, struct page *page) | |
480 | { | |
481 | struct inode *inode = page->mapping->host; | |
482 | struct bio *bio = NULL; | |
483 | unsigned int block_offset; | |
484 | unsigned int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits; | |
485 | sector_t page_start; /* address of page in fs blocks */ | |
486 | sector_t pblock; | |
487 | unsigned int xlen; | |
488 | unsigned int len; | |
489 | unsigned int offset; | |
490 | ||
491 | BUG_ON(!PageLocked(page)); | |
492 | page_start = (sector_t)page->index << | |
493 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
494 | ||
495 | block_offset = 0; | |
496 | while (block_offset < blocks_per_page) { | |
497 | xlen = blocks_per_page - block_offset; | |
498 | pblock = metapage_get_blocks(inode, page_start + block_offset, | |
499 | &xlen); | |
500 | if (pblock) { | |
501 | if (!PagePrivate(page)) | |
502 | insert_metapage(page, NULL); | |
503 | inc_io(page); | |
504 | if (bio) | |
505 | submit_bio(READ, bio); | |
506 | ||
507 | bio = bio_alloc(GFP_NOFS, 1); | |
508 | bio->bi_bdev = inode->i_sb->s_bdev; | |
509 | bio->bi_sector = pblock << (inode->i_blkbits - 9); | |
510 | bio->bi_end_io = metapage_read_end_io; | |
511 | bio->bi_private = page; | |
512 | len = xlen << inode->i_blkbits; | |
513 | offset = block_offset << inode->i_blkbits; | |
514 | if (bio_add_page(bio, page, len, offset) < len) | |
515 | goto add_failed; | |
516 | block_offset += xlen; | |
517 | } else | |
518 | block_offset++; | |
1da177e4 | 519 | } |
7fab479b DK |
520 | if (bio) |
521 | submit_bio(READ, bio); | |
522 | else | |
523 | unlock_page(page); | |
524 | ||
525 | return 0; | |
1da177e4 | 526 | |
7fab479b DK |
527 | add_failed: |
528 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
529 | bio_put(bio); | |
530 | dec_io(page, last_read_complete); | |
531 | return -EIO; | |
1da177e4 LT |
532 | } |
533 | ||
27496a8c | 534 | static int metapage_releasepage(struct page *page, gfp_t gfp_mask) |
7fab479b DK |
535 | { |
536 | struct metapage *mp; | |
b964638f | 537 | int ret = 1; |
7fab479b DK |
538 | unsigned int offset; |
539 | ||
540 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
541 | mp = page_to_mp(page, offset); | |
542 | ||
543 | if (!mp) | |
544 | continue; | |
545 | ||
546 | jfs_info("metapage_releasepage: mp = 0x%p", mp); | |
b964638f DK |
547 | if (mp->count || mp->nohomeok || |
548 | test_bit(META_dirty, &mp->flag)) { | |
7fab479b DK |
549 | jfs_info("count = %ld, nohomeok = %d", mp->count, |
550 | mp->nohomeok); | |
b964638f | 551 | ret = 0; |
7fab479b DK |
552 | continue; |
553 | } | |
7fab479b DK |
554 | if (mp->lsn) |
555 | remove_from_logsync(mp); | |
556 | remove_metapage(page, mp); | |
557 | INCREMENT(mpStat.pagefree); | |
558 | free_metapage(mp); | |
559 | } | |
b964638f | 560 | return ret; |
7fab479b DK |
561 | } |
562 | ||
2ff28e22 | 563 | static void metapage_invalidatepage(struct page *page, unsigned long offset) |
7fab479b DK |
564 | { |
565 | BUG_ON(offset); | |
566 | ||
2ff28e22 | 567 | BUG_ON(PageWriteback(page)); |
7fab479b | 568 | |
2ff28e22 | 569 | metapage_releasepage(page, 0); |
7fab479b DK |
570 | } |
571 | ||
f5e54d6e | 572 | const struct address_space_operations jfs_metapage_aops = { |
7fab479b DK |
573 | .readpage = metapage_readpage, |
574 | .writepage = metapage_writepage, | |
575 | .sync_page = block_sync_page, | |
576 | .releasepage = metapage_releasepage, | |
577 | .invalidatepage = metapage_invalidatepage, | |
578 | .set_page_dirty = __set_page_dirty_nobuffers, | |
579 | }; | |
580 | ||
1da177e4 LT |
581 | struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, |
582 | unsigned int size, int absolute, | |
583 | unsigned long new) | |
584 | { | |
1da177e4 LT |
585 | int l2BlocksPerPage; |
586 | int l2bsize; | |
587 | struct address_space *mapping; | |
7fab479b DK |
588 | struct metapage *mp = NULL; |
589 | struct page *page; | |
1da177e4 LT |
590 | unsigned long page_index; |
591 | unsigned long page_offset; | |
592 | ||
7fab479b DK |
593 | jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d", |
594 | inode->i_ino, lblock, absolute); | |
595 | ||
596 | l2bsize = inode->i_blkbits; | |
597 | l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize; | |
598 | page_index = lblock >> l2BlocksPerPage; | |
599 | page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; | |
600 | if ((page_offset + size) > PAGE_CACHE_SIZE) { | |
601 | jfs_err("MetaData crosses page boundary!!"); | |
602 | jfs_err("lblock = %lx, size = %d", lblock, size); | |
603 | dump_stack(); | |
604 | return NULL; | |
605 | } | |
1da177e4 | 606 | if (absolute) |
7fab479b | 607 | mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping; |
1da177e4 LT |
608 | else { |
609 | /* | |
610 | * If an nfs client tries to read an inode that is larger | |
611 | * than any existing inodes, we may try to read past the | |
612 | * end of the inode map | |
613 | */ | |
614 | if ((lblock << inode->i_blkbits) >= inode->i_size) | |
615 | return NULL; | |
616 | mapping = inode->i_mapping; | |
617 | } | |
618 | ||
7fab479b DK |
619 | if (new && (PSIZE == PAGE_CACHE_SIZE)) { |
620 | page = grab_cache_page(mapping, page_index); | |
621 | if (!page) { | |
622 | jfs_err("grab_cache_page failed!"); | |
623 | return NULL; | |
624 | } | |
625 | SetPageUptodate(page); | |
626 | } else { | |
090d2b18 | 627 | page = read_mapping_page(mapping, page_index, NULL); |
c40c2024 | 628 | if (IS_ERR(page) || !PageUptodate(page)) { |
090d2b18 | 629 | jfs_err("read_mapping_page failed!"); |
7fab479b DK |
630 | return NULL; |
631 | } | |
632 | lock_page(page); | |
633 | } | |
634 | ||
635 | mp = page_to_mp(page, page_offset); | |
1da177e4 | 636 | if (mp) { |
7fab479b DK |
637 | if (mp->logical_size != size) { |
638 | jfs_error(inode->i_sb, | |
639 | "__get_metapage: mp->logical_size != size"); | |
640 | jfs_err("logical_size = %d, size = %d", | |
641 | mp->logical_size, size); | |
642 | dump_stack(); | |
63f83c9f | 643 | goto unlock; |
1da177e4 LT |
644 | } |
645 | mp->count++; | |
646 | lock_metapage(mp); | |
1da177e4 LT |
647 | if (test_bit(META_discard, &mp->flag)) { |
648 | if (!new) { | |
649 | jfs_error(inode->i_sb, | |
650 | "__get_metapage: using a " | |
651 | "discarded metapage"); | |
7fab479b | 652 | discard_metapage(mp); |
63f83c9f | 653 | goto unlock; |
1da177e4 LT |
654 | } |
655 | clear_bit(META_discard, &mp->flag); | |
656 | } | |
1da177e4 | 657 | } else { |
7fab479b DK |
658 | INCREMENT(mpStat.pagealloc); |
659 | mp = alloc_metapage(GFP_NOFS); | |
660 | mp->page = page; | |
1da177e4 | 661 | mp->flag = 0; |
1da177e4 LT |
662 | mp->xflag = COMMIT_PAGE; |
663 | mp->count = 1; | |
7fab479b | 664 | mp->nohomeok = 0; |
1da177e4 | 665 | mp->logical_size = size; |
7fab479b DK |
666 | mp->data = page_address(page) + page_offset; |
667 | mp->index = lblock; | |
668 | if (unlikely(insert_metapage(page, mp))) { | |
669 | free_metapage(mp); | |
670 | goto unlock; | |
1da177e4 | 671 | } |
7fab479b | 672 | lock_metapage(mp); |
1da177e4 LT |
673 | } |
674 | ||
7fab479b DK |
675 | if (new) { |
676 | jfs_info("zeroing mp = 0x%p", mp); | |
1da177e4 | 677 | memset(mp->data, 0, PSIZE); |
7fab479b | 678 | } |
1da177e4 | 679 | |
7fab479b DK |
680 | unlock_page(page); |
681 | jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data); | |
1da177e4 LT |
682 | return mp; |
683 | ||
7fab479b DK |
684 | unlock: |
685 | unlock_page(page); | |
1da177e4 LT |
686 | return NULL; |
687 | } | |
688 | ||
7fab479b | 689 | void grab_metapage(struct metapage * mp) |
1da177e4 | 690 | { |
7fab479b DK |
691 | jfs_info("grab_metapage: mp = 0x%p", mp); |
692 | page_cache_get(mp->page); | |
693 | lock_page(mp->page); | |
1da177e4 | 694 | mp->count++; |
7fab479b DK |
695 | lock_metapage(mp); |
696 | unlock_page(mp->page); | |
1da177e4 LT |
697 | } |
698 | ||
7fab479b | 699 | void force_metapage(struct metapage *mp) |
1da177e4 | 700 | { |
7fab479b DK |
701 | struct page *page = mp->page; |
702 | jfs_info("force_metapage: mp = 0x%p", mp); | |
703 | set_bit(META_forcewrite, &mp->flag); | |
704 | clear_bit(META_sync, &mp->flag); | |
705 | page_cache_get(page); | |
706 | lock_page(page); | |
707 | set_page_dirty(page); | |
708 | write_one_page(page, 1); | |
709 | clear_bit(META_forcewrite, &mp->flag); | |
710 | page_cache_release(page); | |
711 | } | |
1da177e4 | 712 | |
1868f4aa | 713 | void hold_metapage(struct metapage *mp) |
7fab479b | 714 | { |
1da177e4 | 715 | lock_page(mp->page); |
7fab479b DK |
716 | } |
717 | ||
1868f4aa | 718 | void put_metapage(struct metapage *mp) |
7fab479b DK |
719 | { |
720 | if (mp->count || mp->nohomeok) { | |
721 | /* Someone else will release this */ | |
1da177e4 | 722 | unlock_page(mp->page); |
1da177e4 LT |
723 | return; |
724 | } | |
7fab479b DK |
725 | page_cache_get(mp->page); |
726 | mp->count++; | |
727 | lock_metapage(mp); | |
1da177e4 | 728 | unlock_page(mp->page); |
7fab479b | 729 | release_metapage(mp); |
1da177e4 LT |
730 | } |
731 | ||
732 | void release_metapage(struct metapage * mp) | |
733 | { | |
7fab479b | 734 | struct page *page = mp->page; |
1da177e4 LT |
735 | jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag); |
736 | ||
7fab479b DK |
737 | BUG_ON(!page); |
738 | ||
739 | lock_page(page); | |
740 | unlock_metapage(mp); | |
1da177e4 LT |
741 | |
742 | assert(mp->count); | |
7fab479b DK |
743 | if (--mp->count || mp->nohomeok) { |
744 | unlock_page(page); | |
745 | page_cache_release(page); | |
1da177e4 LT |
746 | return; |
747 | } | |
748 | ||
7fab479b DK |
749 | if (test_bit(META_dirty, &mp->flag)) { |
750 | set_page_dirty(page); | |
1da177e4 | 751 | if (test_bit(META_sync, &mp->flag)) { |
1da177e4 | 752 | clear_bit(META_sync, &mp->flag); |
7fab479b DK |
753 | write_one_page(page, 1); |
754 | lock_page(page); /* write_one_page unlocks the page */ | |
1da177e4 | 755 | } |
7fab479b DK |
756 | } else if (mp->lsn) /* discard_metapage doesn't remove it */ |
757 | remove_from_logsync(mp); | |
1da177e4 | 758 | |
7fab479b DK |
759 | /* Try to keep metapages from using up too much memory */ |
760 | drop_metapage(page, mp); | |
d0e671a9 | 761 | |
7fab479b DK |
762 | unlock_page(page); |
763 | page_cache_release(page); | |
1da177e4 LT |
764 | } |
765 | ||
766 | void __invalidate_metapages(struct inode *ip, s64 addr, int len) | |
767 | { | |
7fab479b | 768 | sector_t lblock; |
1da177e4 | 769 | int l2BlocksPerPage = PAGE_CACHE_SHIFT - ip->i_blkbits; |
7fab479b | 770 | int BlocksPerPage = 1 << l2BlocksPerPage; |
1da177e4 | 771 | /* All callers are interested in block device's mapping */ |
7fab479b DK |
772 | struct address_space *mapping = |
773 | JFS_SBI(ip->i_sb)->direct_inode->i_mapping; | |
1da177e4 LT |
774 | struct metapage *mp; |
775 | struct page *page; | |
7fab479b | 776 | unsigned int offset; |
1da177e4 LT |
777 | |
778 | /* | |
7fab479b | 779 | * Mark metapages to discard. They will eventually be |
1da177e4 LT |
780 | * released, but should not be written. |
781 | */ | |
7fab479b DK |
782 | for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len; |
783 | lblock += BlocksPerPage) { | |
784 | page = find_lock_page(mapping, lblock >> l2BlocksPerPage); | |
785 | if (!page) | |
786 | continue; | |
787 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
788 | mp = page_to_mp(page, offset); | |
789 | if (!mp) | |
790 | continue; | |
791 | if (mp->index < addr) | |
792 | continue; | |
793 | if (mp->index >= addr + len) | |
794 | break; | |
1da177e4 LT |
795 | |
796 | clear_bit(META_dirty, &mp->flag); | |
797 | set_bit(META_discard, &mp->flag); | |
7fab479b DK |
798 | if (mp->lsn) |
799 | remove_from_logsync(mp); | |
1da177e4 | 800 | } |
7fab479b DK |
801 | unlock_page(page); |
802 | page_cache_release(page); | |
1da177e4 LT |
803 | } |
804 | } | |
805 | ||
806 | #ifdef CONFIG_JFS_STATISTICS | |
807 | int jfs_mpstat_read(char *buffer, char **start, off_t offset, int length, | |
808 | int *eof, void *data) | |
809 | { | |
810 | int len = 0; | |
811 | off_t begin; | |
812 | ||
813 | len += sprintf(buffer, | |
814 | "JFS Metapage statistics\n" | |
815 | "=======================\n" | |
816 | "page allocations = %d\n" | |
817 | "page frees = %d\n" | |
818 | "lock waits = %d\n", | |
819 | mpStat.pagealloc, | |
820 | mpStat.pagefree, | |
821 | mpStat.lockwait); | |
822 | ||
823 | begin = offset; | |
824 | *start = buffer + begin; | |
825 | len -= begin; | |
826 | ||
827 | if (len > length) | |
828 | len = length; | |
829 | else | |
830 | *eof = 1; | |
831 | ||
832 | if (len < 0) | |
833 | len = 0; | |
834 | ||
835 | return len; | |
836 | } | |
837 | #endif |