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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); |
1da177e4 | 59 | 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 | ||
187 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
188 | SLAB_CTOR_CONSTRUCTOR) { | |
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); | |
197 | } | |
198 | } | |
199 | ||
27496a8c | 200 | static inline struct metapage *alloc_metapage(gfp_t gfp_mask) |
1da177e4 LT |
201 | { |
202 | return mempool_alloc(metapage_mempool, gfp_mask); | |
203 | } | |
204 | ||
205 | static inline void free_metapage(struct metapage *mp) | |
206 | { | |
207 | mp->flag = 0; | |
208 | set_bit(META_free, &mp->flag); | |
209 | ||
210 | mempool_free(mp, metapage_mempool); | |
211 | } | |
212 | ||
213 | int __init metapage_init(void) | |
214 | { | |
215 | /* | |
216 | * Allocate the metapage structures | |
217 | */ | |
218 | metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage), | |
219 | 0, 0, init_once, NULL); | |
220 | if (metapage_cache == NULL) | |
221 | return -ENOMEM; | |
222 | ||
93d2341c MD |
223 | metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES, |
224 | metapage_cache); | |
1da177e4 LT |
225 | |
226 | if (metapage_mempool == NULL) { | |
227 | kmem_cache_destroy(metapage_cache); | |
228 | return -ENOMEM; | |
229 | } | |
1da177e4 LT |
230 | |
231 | return 0; | |
232 | } | |
233 | ||
234 | void metapage_exit(void) | |
235 | { | |
236 | mempool_destroy(metapage_mempool); | |
237 | kmem_cache_destroy(metapage_cache); | |
238 | } | |
239 | ||
7fab479b DK |
240 | static inline void drop_metapage(struct page *page, struct metapage *mp) |
241 | { | |
242 | if (mp->count || mp->nohomeok || test_bit(META_dirty, &mp->flag) || | |
243 | test_bit(META_io, &mp->flag)) | |
244 | return; | |
245 | remove_metapage(page, mp); | |
246 | INCREMENT(mpStat.pagefree); | |
247 | free_metapage(mp); | |
248 | } | |
249 | ||
1da177e4 | 250 | /* |
7fab479b | 251 | * Metapage address space operations |
1da177e4 | 252 | */ |
7fab479b DK |
253 | |
254 | static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock, | |
255 | unsigned int *len) | |
1da177e4 | 256 | { |
7fab479b DK |
257 | int rc = 0; |
258 | int xflag; | |
259 | s64 xaddr; | |
ba52de12 | 260 | sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
7fab479b DK |
261 | inode->i_blkbits; |
262 | ||
263 | if (lblock >= file_blocks) | |
264 | return 0; | |
265 | if (lblock + *len > file_blocks) | |
266 | *len = file_blocks - lblock; | |
267 | ||
268 | if (inode->i_ino) { | |
269 | rc = xtLookup(inode, (s64)lblock, *len, &xflag, &xaddr, len, 0); | |
270 | if ((rc == 0) && *len) | |
271 | lblock = (sector_t)xaddr; | |
272 | else | |
273 | lblock = 0; | |
274 | } /* else no mapping */ | |
275 | ||
276 | return lblock; | |
1da177e4 LT |
277 | } |
278 | ||
7fab479b | 279 | static void last_read_complete(struct page *page) |
1da177e4 | 280 | { |
7fab479b DK |
281 | if (!PageError(page)) |
282 | SetPageUptodate(page); | |
283 | unlock_page(page); | |
284 | } | |
285 | ||
286 | static int metapage_read_end_io(struct bio *bio, unsigned int bytes_done, | |
287 | int err) | |
288 | { | |
289 | struct page *page = bio->bi_private; | |
290 | ||
291 | if (bio->bi_size) | |
292 | return 1; | |
1da177e4 | 293 | |
7fab479b DK |
294 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
295 | printk(KERN_ERR "metapage_read_end_io: I/O error\n"); | |
296 | SetPageError(page); | |
1da177e4 LT |
297 | } |
298 | ||
7fab479b DK |
299 | dec_io(page, last_read_complete); |
300 | bio_put(bio); | |
301 | ||
302 | return 0; | |
1da177e4 LT |
303 | } |
304 | ||
7fab479b | 305 | static void remove_from_logsync(struct metapage *mp) |
1da177e4 | 306 | { |
7fab479b DK |
307 | struct jfs_log *log = mp->log; |
308 | unsigned long flags; | |
309 | /* | |
310 | * This can race. Recheck that log hasn't been set to null, and after | |
311 | * acquiring logsync lock, recheck lsn | |
312 | */ | |
313 | if (!log) | |
314 | return; | |
315 | ||
316 | LOGSYNC_LOCK(log, flags); | |
317 | if (mp->lsn) { | |
318 | mp->log = NULL; | |
319 | mp->lsn = 0; | |
320 | mp->clsn = 0; | |
321 | log->count--; | |
322 | list_del(&mp->synclist); | |
323 | } | |
324 | LOGSYNC_UNLOCK(log, flags); | |
325 | } | |
1da177e4 | 326 | |
7fab479b DK |
327 | static void last_write_complete(struct page *page) |
328 | { | |
329 | struct metapage *mp; | |
330 | unsigned int offset; | |
331 | ||
332 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
333 | mp = page_to_mp(page, offset); | |
334 | if (mp && test_bit(META_io, &mp->flag)) { | |
335 | if (mp->lsn) | |
336 | remove_from_logsync(mp); | |
337 | clear_bit(META_io, &mp->flag); | |
338 | } | |
339 | /* | |
340 | * I'd like to call drop_metapage here, but I don't think it's | |
341 | * safe unless I have the page locked | |
342 | */ | |
343 | } | |
344 | end_page_writeback(page); | |
1da177e4 LT |
345 | } |
346 | ||
7fab479b DK |
347 | static int metapage_write_end_io(struct bio *bio, unsigned int bytes_done, |
348 | int err) | |
1da177e4 | 349 | { |
7fab479b DK |
350 | struct page *page = bio->bi_private; |
351 | ||
352 | BUG_ON(!PagePrivate(page)); | |
353 | ||
354 | if (bio->bi_size) | |
355 | return 1; | |
356 | ||
357 | if (! test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
358 | printk(KERN_ERR "metapage_write_end_io: I/O error\n"); | |
359 | SetPageError(page); | |
360 | } | |
361 | dec_io(page, last_write_complete); | |
362 | bio_put(bio); | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int metapage_writepage(struct page *page, struct writeback_control *wbc) | |
367 | { | |
368 | struct bio *bio = NULL; | |
369 | unsigned int block_offset; /* block offset of mp within page */ | |
370 | struct inode *inode = page->mapping->host; | |
371 | unsigned int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage; | |
372 | unsigned int len; | |
373 | unsigned int xlen; | |
374 | struct metapage *mp; | |
375 | int redirty = 0; | |
376 | sector_t lblock; | |
377 | sector_t pblock; | |
378 | sector_t next_block = 0; | |
379 | sector_t page_start; | |
380 | unsigned long bio_bytes = 0; | |
381 | unsigned long bio_offset = 0; | |
382 | unsigned int offset; | |
383 | ||
384 | page_start = (sector_t)page->index << | |
385 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
386 | BUG_ON(!PageLocked(page)); | |
387 | BUG_ON(PageWriteback(page)); | |
388 | ||
389 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
390 | mp = page_to_mp(page, offset); | |
391 | ||
392 | if (!mp || !test_bit(META_dirty, &mp->flag)) | |
393 | continue; | |
394 | ||
395 | if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) { | |
396 | redirty = 1; | |
ac17b8b5 DK |
397 | /* |
398 | * Make sure this page isn't blocked indefinitely. | |
399 | * If the journal isn't undergoing I/O, push it | |
400 | */ | |
401 | if (mp->log && !(mp->log->cflag & logGC_PAGEOUT)) | |
402 | jfs_flush_journal(mp->log, 0); | |
7fab479b DK |
403 | continue; |
404 | } | |
405 | ||
406 | clear_bit(META_dirty, &mp->flag); | |
407 | block_offset = offset >> inode->i_blkbits; | |
408 | lblock = page_start + block_offset; | |
409 | if (bio) { | |
410 | if (xlen && lblock == next_block) { | |
411 | /* Contiguous, in memory & on disk */ | |
412 | len = min(xlen, blocks_per_mp); | |
413 | xlen -= len; | |
414 | bio_bytes += len << inode->i_blkbits; | |
415 | set_bit(META_io, &mp->flag); | |
416 | continue; | |
417 | } | |
418 | /* Not contiguous */ | |
419 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < | |
420 | bio_bytes) | |
421 | goto add_failed; | |
422 | /* | |
423 | * Increment counter before submitting i/o to keep | |
424 | * count from hitting zero before we're through | |
425 | */ | |
426 | inc_io(page); | |
427 | if (!bio->bi_size) | |
428 | goto dump_bio; | |
429 | submit_bio(WRITE, bio); | |
430 | bio = NULL; | |
431 | } else { | |
432 | set_page_writeback(page); | |
433 | inc_io(page); | |
434 | } | |
435 | xlen = (PAGE_CACHE_SIZE - offset) >> inode->i_blkbits; | |
436 | pblock = metapage_get_blocks(inode, lblock, &xlen); | |
437 | if (!pblock) { | |
438 | /* Need better error handling */ | |
439 | printk(KERN_ERR "JFS: metapage_get_blocks failed\n"); | |
440 | dec_io(page, last_write_complete); | |
441 | continue; | |
442 | } | |
443 | set_bit(META_io, &mp->flag); | |
444 | len = min(xlen, (uint) JFS_SBI(inode->i_sb)->nbperpage); | |
445 | ||
446 | bio = bio_alloc(GFP_NOFS, 1); | |
447 | bio->bi_bdev = inode->i_sb->s_bdev; | |
448 | bio->bi_sector = pblock << (inode->i_blkbits - 9); | |
449 | bio->bi_end_io = metapage_write_end_io; | |
450 | bio->bi_private = page; | |
451 | ||
452 | /* Don't call bio_add_page yet, we may add to this vec */ | |
453 | bio_offset = offset; | |
454 | bio_bytes = len << inode->i_blkbits; | |
455 | ||
456 | xlen -= len; | |
457 | next_block = lblock + len; | |
458 | } | |
459 | if (bio) { | |
460 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes) | |
461 | goto add_failed; | |
462 | if (!bio->bi_size) | |
463 | goto dump_bio; | |
63f83c9f | 464 | |
7fab479b DK |
465 | submit_bio(WRITE, bio); |
466 | } | |
467 | if (redirty) | |
468 | redirty_page_for_writepage(wbc, page); | |
469 | ||
470 | unlock_page(page); | |
471 | ||
472 | return 0; | |
473 | add_failed: | |
474 | /* We should never reach here, since we're only adding one vec */ | |
475 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
476 | goto skip; | |
477 | dump_bio: | |
478 | dump_mem("bio", bio, sizeof(*bio)); | |
479 | skip: | |
480 | bio_put(bio); | |
481 | unlock_page(page); | |
482 | dec_io(page, last_write_complete); | |
483 | ||
484 | return -EIO; | |
485 | } | |
486 | ||
487 | static int metapage_readpage(struct file *fp, struct page *page) | |
488 | { | |
489 | struct inode *inode = page->mapping->host; | |
490 | struct bio *bio = NULL; | |
491 | unsigned int block_offset; | |
492 | unsigned int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits; | |
493 | sector_t page_start; /* address of page in fs blocks */ | |
494 | sector_t pblock; | |
495 | unsigned int xlen; | |
496 | unsigned int len; | |
497 | unsigned int offset; | |
498 | ||
499 | BUG_ON(!PageLocked(page)); | |
500 | page_start = (sector_t)page->index << | |
501 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
502 | ||
503 | block_offset = 0; | |
504 | while (block_offset < blocks_per_page) { | |
505 | xlen = blocks_per_page - block_offset; | |
506 | pblock = metapage_get_blocks(inode, page_start + block_offset, | |
507 | &xlen); | |
508 | if (pblock) { | |
509 | if (!PagePrivate(page)) | |
510 | insert_metapage(page, NULL); | |
511 | inc_io(page); | |
512 | if (bio) | |
513 | submit_bio(READ, bio); | |
514 | ||
515 | bio = bio_alloc(GFP_NOFS, 1); | |
516 | bio->bi_bdev = inode->i_sb->s_bdev; | |
517 | bio->bi_sector = pblock << (inode->i_blkbits - 9); | |
518 | bio->bi_end_io = metapage_read_end_io; | |
519 | bio->bi_private = page; | |
520 | len = xlen << inode->i_blkbits; | |
521 | offset = block_offset << inode->i_blkbits; | |
522 | if (bio_add_page(bio, page, len, offset) < len) | |
523 | goto add_failed; | |
524 | block_offset += xlen; | |
525 | } else | |
526 | block_offset++; | |
1da177e4 | 527 | } |
7fab479b DK |
528 | if (bio) |
529 | submit_bio(READ, bio); | |
530 | else | |
531 | unlock_page(page); | |
532 | ||
533 | return 0; | |
1da177e4 | 534 | |
7fab479b DK |
535 | add_failed: |
536 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
537 | bio_put(bio); | |
538 | dec_io(page, last_read_complete); | |
539 | return -EIO; | |
1da177e4 LT |
540 | } |
541 | ||
27496a8c | 542 | static int metapage_releasepage(struct page *page, gfp_t gfp_mask) |
7fab479b DK |
543 | { |
544 | struct metapage *mp; | |
b964638f | 545 | int ret = 1; |
7fab479b DK |
546 | unsigned int offset; |
547 | ||
548 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
549 | mp = page_to_mp(page, offset); | |
550 | ||
551 | if (!mp) | |
552 | continue; | |
553 | ||
554 | jfs_info("metapage_releasepage: mp = 0x%p", mp); | |
b964638f DK |
555 | if (mp->count || mp->nohomeok || |
556 | test_bit(META_dirty, &mp->flag)) { | |
7fab479b DK |
557 | jfs_info("count = %ld, nohomeok = %d", mp->count, |
558 | mp->nohomeok); | |
b964638f | 559 | ret = 0; |
7fab479b DK |
560 | continue; |
561 | } | |
7fab479b DK |
562 | if (mp->lsn) |
563 | remove_from_logsync(mp); | |
564 | remove_metapage(page, mp); | |
565 | INCREMENT(mpStat.pagefree); | |
566 | free_metapage(mp); | |
567 | } | |
b964638f | 568 | return ret; |
7fab479b DK |
569 | } |
570 | ||
2ff28e22 | 571 | static void metapage_invalidatepage(struct page *page, unsigned long offset) |
7fab479b DK |
572 | { |
573 | BUG_ON(offset); | |
574 | ||
2ff28e22 | 575 | BUG_ON(PageWriteback(page)); |
7fab479b | 576 | |
2ff28e22 | 577 | metapage_releasepage(page, 0); |
7fab479b DK |
578 | } |
579 | ||
f5e54d6e | 580 | const struct address_space_operations jfs_metapage_aops = { |
7fab479b DK |
581 | .readpage = metapage_readpage, |
582 | .writepage = metapage_writepage, | |
583 | .sync_page = block_sync_page, | |
584 | .releasepage = metapage_releasepage, | |
585 | .invalidatepage = metapage_invalidatepage, | |
586 | .set_page_dirty = __set_page_dirty_nobuffers, | |
587 | }; | |
588 | ||
1da177e4 LT |
589 | struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, |
590 | unsigned int size, int absolute, | |
591 | unsigned long new) | |
592 | { | |
1da177e4 LT |
593 | int l2BlocksPerPage; |
594 | int l2bsize; | |
595 | struct address_space *mapping; | |
7fab479b DK |
596 | struct metapage *mp = NULL; |
597 | struct page *page; | |
1da177e4 LT |
598 | unsigned long page_index; |
599 | unsigned long page_offset; | |
600 | ||
7fab479b DK |
601 | jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d", |
602 | inode->i_ino, lblock, absolute); | |
603 | ||
604 | l2bsize = inode->i_blkbits; | |
605 | l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize; | |
606 | page_index = lblock >> l2BlocksPerPage; | |
607 | page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; | |
608 | if ((page_offset + size) > PAGE_CACHE_SIZE) { | |
609 | jfs_err("MetaData crosses page boundary!!"); | |
610 | jfs_err("lblock = %lx, size = %d", lblock, size); | |
611 | dump_stack(); | |
612 | return NULL; | |
613 | } | |
1da177e4 | 614 | if (absolute) |
7fab479b | 615 | mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping; |
1da177e4 LT |
616 | else { |
617 | /* | |
618 | * If an nfs client tries to read an inode that is larger | |
619 | * than any existing inodes, we may try to read past the | |
620 | * end of the inode map | |
621 | */ | |
622 | if ((lblock << inode->i_blkbits) >= inode->i_size) | |
623 | return NULL; | |
624 | mapping = inode->i_mapping; | |
625 | } | |
626 | ||
7fab479b DK |
627 | if (new && (PSIZE == PAGE_CACHE_SIZE)) { |
628 | page = grab_cache_page(mapping, page_index); | |
629 | if (!page) { | |
630 | jfs_err("grab_cache_page failed!"); | |
631 | return NULL; | |
632 | } | |
633 | SetPageUptodate(page); | |
634 | } else { | |
090d2b18 | 635 | page = read_mapping_page(mapping, page_index, NULL); |
c40c2024 | 636 | if (IS_ERR(page) || !PageUptodate(page)) { |
090d2b18 | 637 | jfs_err("read_mapping_page failed!"); |
7fab479b DK |
638 | return NULL; |
639 | } | |
640 | lock_page(page); | |
641 | } | |
642 | ||
643 | mp = page_to_mp(page, page_offset); | |
1da177e4 | 644 | if (mp) { |
7fab479b DK |
645 | if (mp->logical_size != size) { |
646 | jfs_error(inode->i_sb, | |
647 | "__get_metapage: mp->logical_size != size"); | |
648 | jfs_err("logical_size = %d, size = %d", | |
649 | mp->logical_size, size); | |
650 | dump_stack(); | |
63f83c9f | 651 | goto unlock; |
1da177e4 LT |
652 | } |
653 | mp->count++; | |
654 | lock_metapage(mp); | |
1da177e4 LT |
655 | if (test_bit(META_discard, &mp->flag)) { |
656 | if (!new) { | |
657 | jfs_error(inode->i_sb, | |
658 | "__get_metapage: using a " | |
659 | "discarded metapage"); | |
7fab479b | 660 | discard_metapage(mp); |
63f83c9f | 661 | goto unlock; |
1da177e4 LT |
662 | } |
663 | clear_bit(META_discard, &mp->flag); | |
664 | } | |
1da177e4 | 665 | } else { |
7fab479b DK |
666 | INCREMENT(mpStat.pagealloc); |
667 | mp = alloc_metapage(GFP_NOFS); | |
668 | mp->page = page; | |
1da177e4 | 669 | mp->flag = 0; |
1da177e4 LT |
670 | mp->xflag = COMMIT_PAGE; |
671 | mp->count = 1; | |
7fab479b | 672 | mp->nohomeok = 0; |
1da177e4 | 673 | mp->logical_size = size; |
7fab479b DK |
674 | mp->data = page_address(page) + page_offset; |
675 | mp->index = lblock; | |
676 | if (unlikely(insert_metapage(page, mp))) { | |
677 | free_metapage(mp); | |
678 | goto unlock; | |
1da177e4 | 679 | } |
7fab479b | 680 | lock_metapage(mp); |
1da177e4 LT |
681 | } |
682 | ||
7fab479b DK |
683 | if (new) { |
684 | jfs_info("zeroing mp = 0x%p", mp); | |
1da177e4 | 685 | memset(mp->data, 0, PSIZE); |
7fab479b | 686 | } |
1da177e4 | 687 | |
7fab479b DK |
688 | unlock_page(page); |
689 | jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data); | |
1da177e4 LT |
690 | return mp; |
691 | ||
7fab479b DK |
692 | unlock: |
693 | unlock_page(page); | |
1da177e4 LT |
694 | return NULL; |
695 | } | |
696 | ||
7fab479b | 697 | void grab_metapage(struct metapage * mp) |
1da177e4 | 698 | { |
7fab479b DK |
699 | jfs_info("grab_metapage: mp = 0x%p", mp); |
700 | page_cache_get(mp->page); | |
701 | lock_page(mp->page); | |
1da177e4 | 702 | mp->count++; |
7fab479b DK |
703 | lock_metapage(mp); |
704 | unlock_page(mp->page); | |
1da177e4 LT |
705 | } |
706 | ||
7fab479b | 707 | void force_metapage(struct metapage *mp) |
1da177e4 | 708 | { |
7fab479b DK |
709 | struct page *page = mp->page; |
710 | jfs_info("force_metapage: mp = 0x%p", mp); | |
711 | set_bit(META_forcewrite, &mp->flag); | |
712 | clear_bit(META_sync, &mp->flag); | |
713 | page_cache_get(page); | |
714 | lock_page(page); | |
715 | set_page_dirty(page); | |
716 | write_one_page(page, 1); | |
717 | clear_bit(META_forcewrite, &mp->flag); | |
718 | page_cache_release(page); | |
719 | } | |
1da177e4 | 720 | |
1868f4aa | 721 | void hold_metapage(struct metapage *mp) |
7fab479b | 722 | { |
1da177e4 | 723 | lock_page(mp->page); |
7fab479b DK |
724 | } |
725 | ||
1868f4aa | 726 | void put_metapage(struct metapage *mp) |
7fab479b DK |
727 | { |
728 | if (mp->count || mp->nohomeok) { | |
729 | /* Someone else will release this */ | |
1da177e4 | 730 | unlock_page(mp->page); |
1da177e4 LT |
731 | return; |
732 | } | |
7fab479b DK |
733 | page_cache_get(mp->page); |
734 | mp->count++; | |
735 | lock_metapage(mp); | |
1da177e4 | 736 | unlock_page(mp->page); |
7fab479b | 737 | release_metapage(mp); |
1da177e4 LT |
738 | } |
739 | ||
740 | void release_metapage(struct metapage * mp) | |
741 | { | |
7fab479b | 742 | struct page *page = mp->page; |
1da177e4 LT |
743 | jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag); |
744 | ||
7fab479b DK |
745 | BUG_ON(!page); |
746 | ||
747 | lock_page(page); | |
748 | unlock_metapage(mp); | |
1da177e4 LT |
749 | |
750 | assert(mp->count); | |
7fab479b DK |
751 | if (--mp->count || mp->nohomeok) { |
752 | unlock_page(page); | |
753 | page_cache_release(page); | |
1da177e4 LT |
754 | return; |
755 | } | |
756 | ||
7fab479b DK |
757 | if (test_bit(META_dirty, &mp->flag)) { |
758 | set_page_dirty(page); | |
1da177e4 | 759 | if (test_bit(META_sync, &mp->flag)) { |
1da177e4 | 760 | clear_bit(META_sync, &mp->flag); |
7fab479b DK |
761 | write_one_page(page, 1); |
762 | lock_page(page); /* write_one_page unlocks the page */ | |
1da177e4 | 763 | } |
7fab479b DK |
764 | } else if (mp->lsn) /* discard_metapage doesn't remove it */ |
765 | remove_from_logsync(mp); | |
1da177e4 | 766 | |
7fab479b DK |
767 | #if MPS_PER_PAGE == 1 |
768 | /* | |
769 | * If we know this is the only thing in the page, we can throw | |
770 | * the page out of the page cache. If pages are larger, we | |
771 | * don't want to do this. | |
772 | */ | |
1da177e4 | 773 | |
7fab479b DK |
774 | /* Retest mp->count since we may have released page lock */ |
775 | if (test_bit(META_discard, &mp->flag) && !mp->count) { | |
776 | clear_page_dirty(page); | |
777 | ClearPageUptodate(page); | |
1da177e4 | 778 | } |
7fab479b DK |
779 | #else |
780 | /* Try to keep metapages from using up too much memory */ | |
781 | drop_metapage(page, mp); | |
782 | #endif | |
783 | unlock_page(page); | |
784 | page_cache_release(page); | |
1da177e4 LT |
785 | } |
786 | ||
787 | void __invalidate_metapages(struct inode *ip, s64 addr, int len) | |
788 | { | |
7fab479b | 789 | sector_t lblock; |
1da177e4 | 790 | int l2BlocksPerPage = PAGE_CACHE_SHIFT - ip->i_blkbits; |
7fab479b | 791 | int BlocksPerPage = 1 << l2BlocksPerPage; |
1da177e4 | 792 | /* All callers are interested in block device's mapping */ |
7fab479b DK |
793 | struct address_space *mapping = |
794 | JFS_SBI(ip->i_sb)->direct_inode->i_mapping; | |
1da177e4 LT |
795 | struct metapage *mp; |
796 | struct page *page; | |
7fab479b | 797 | unsigned int offset; |
1da177e4 LT |
798 | |
799 | /* | |
7fab479b | 800 | * Mark metapages to discard. They will eventually be |
1da177e4 LT |
801 | * released, but should not be written. |
802 | */ | |
7fab479b DK |
803 | for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len; |
804 | lblock += BlocksPerPage) { | |
805 | page = find_lock_page(mapping, lblock >> l2BlocksPerPage); | |
806 | if (!page) | |
807 | continue; | |
808 | for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { | |
809 | mp = page_to_mp(page, offset); | |
810 | if (!mp) | |
811 | continue; | |
812 | if (mp->index < addr) | |
813 | continue; | |
814 | if (mp->index >= addr + len) | |
815 | break; | |
1da177e4 LT |
816 | |
817 | clear_bit(META_dirty, &mp->flag); | |
818 | set_bit(META_discard, &mp->flag); | |
7fab479b DK |
819 | if (mp->lsn) |
820 | remove_from_logsync(mp); | |
1da177e4 | 821 | } |
7fab479b DK |
822 | unlock_page(page); |
823 | page_cache_release(page); | |
1da177e4 LT |
824 | } |
825 | } | |
826 | ||
827 | #ifdef CONFIG_JFS_STATISTICS | |
828 | int jfs_mpstat_read(char *buffer, char **start, off_t offset, int length, | |
829 | int *eof, void *data) | |
830 | { | |
831 | int len = 0; | |
832 | off_t begin; | |
833 | ||
834 | len += sprintf(buffer, | |
835 | "JFS Metapage statistics\n" | |
836 | "=======================\n" | |
837 | "page allocations = %d\n" | |
838 | "page frees = %d\n" | |
839 | "lock waits = %d\n", | |
840 | mpStat.pagealloc, | |
841 | mpStat.pagefree, | |
842 | mpStat.lockwait); | |
843 | ||
844 | begin = offset; | |
845 | *start = buffer + begin; | |
846 | len -= begin; | |
847 | ||
848 | if (len > length) | |
849 | len = length; | |
850 | else | |
851 | *eof = 1; | |
852 | ||
853 | if (len < 0) | |
854 | len = 0; | |
855 | ||
856 | return len; | |
857 | } | |
858 | #endif |