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Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
7fab479b | 3 | * Copyright (C) International Business Machines Corp., 2000-2005 |
1da177e4 | 4 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
1da177e4 LT |
5 | */ |
6 | ||
7 | #include <linux/fs.h> | |
7fab479b | 8 | #include <linux/mm.h> |
b2e03ca7 | 9 | #include <linux/module.h> |
7fab479b | 10 | #include <linux/bio.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
1da177e4 LT |
12 | #include <linux/init.h> |
13 | #include <linux/buffer_head.h> | |
14 | #include <linux/mempool.h> | |
b2e03ca7 | 15 | #include <linux/seq_file.h> |
cd78ab11 | 16 | #include <linux/writeback.h> |
1da177e4 LT |
17 | #include "jfs_incore.h" |
18 | #include "jfs_superblock.h" | |
19 | #include "jfs_filsys.h" | |
20 | #include "jfs_metapage.h" | |
21 | #include "jfs_txnmgr.h" | |
22 | #include "jfs_debug.h" | |
23 | ||
1da177e4 LT |
24 | #ifdef CONFIG_JFS_STATISTICS |
25 | static struct { | |
26 | uint pagealloc; /* # of page allocations */ | |
27 | uint pagefree; /* # of page frees */ | |
28 | uint lockwait; /* # of sleeping lock_metapage() calls */ | |
29 | } mpStat; | |
30 | #endif | |
31 | ||
7fab479b | 32 | #define metapage_locked(mp) test_bit(META_locked, &(mp)->flag) |
54af6233 | 33 | #define trylock_metapage(mp) test_and_set_bit_lock(META_locked, &(mp)->flag) |
1da177e4 LT |
34 | |
35 | static inline void unlock_metapage(struct metapage *mp) | |
36 | { | |
54af6233 | 37 | clear_bit_unlock(META_locked, &mp->flag); |
1da177e4 LT |
38 | wake_up(&mp->wait); |
39 | } | |
40 | ||
7fab479b | 41 | static inline void __lock_metapage(struct metapage *mp) |
1da177e4 LT |
42 | { |
43 | DECLARE_WAITQUEUE(wait, current); | |
1da177e4 | 44 | INCREMENT(mpStat.lockwait); |
1da177e4 LT |
45 | add_wait_queue_exclusive(&mp->wait, &wait); |
46 | do { | |
47 | set_current_state(TASK_UNINTERRUPTIBLE); | |
48 | if (metapage_locked(mp)) { | |
7fab479b | 49 | unlock_page(mp->page); |
4aa0d230 | 50 | io_schedule(); |
7fab479b | 51 | lock_page(mp->page); |
1da177e4 LT |
52 | } |
53 | } while (trylock_metapage(mp)); | |
54 | __set_current_state(TASK_RUNNING); | |
55 | remove_wait_queue(&mp->wait, &wait); | |
56 | } | |
57 | ||
7fab479b DK |
58 | /* |
59 | * Must have mp->page locked | |
60 | */ | |
1da177e4 LT |
61 | static inline void lock_metapage(struct metapage *mp) |
62 | { | |
63 | if (trylock_metapage(mp)) | |
64 | __lock_metapage(mp); | |
65 | } | |
66 | ||
67 | #define METAPOOL_MIN_PAGES 32 | |
e18b890b | 68 | static struct kmem_cache *metapage_cache; |
1da177e4 LT |
69 | static mempool_t *metapage_mempool; |
70 | ||
09cbfeaf | 71 | #define MPS_PER_PAGE (PAGE_SIZE >> L2PSIZE) |
7fab479b DK |
72 | |
73 | #if MPS_PER_PAGE > 1 | |
74 | ||
75 | struct meta_anchor { | |
76 | int mp_count; | |
77 | atomic_t io_count; | |
78 | struct metapage *mp[MPS_PER_PAGE]; | |
79 | }; | |
4c21e2f2 | 80 | #define mp_anchor(page) ((struct meta_anchor *)page_private(page)) |
7fab479b | 81 | |
967c9ec4 | 82 | static inline struct metapage *page_to_mp(struct page *page, int offset) |
7fab479b DK |
83 | { |
84 | if (!PagePrivate(page)) | |
85 | return NULL; | |
86 | return mp_anchor(page)->mp[offset >> L2PSIZE]; | |
87 | } | |
88 | ||
89 | static inline int insert_metapage(struct page *page, struct metapage *mp) | |
90 | { | |
91 | struct meta_anchor *a; | |
92 | int index; | |
93 | int l2mp_blocks; /* log2 blocks per metapage */ | |
94 | ||
95 | if (PagePrivate(page)) | |
96 | a = mp_anchor(page); | |
97 | else { | |
5b3030e3 | 98 | a = kzalloc(sizeof(struct meta_anchor), GFP_NOFS); |
7fab479b DK |
99 | if (!a) |
100 | return -ENOMEM; | |
4c21e2f2 | 101 | set_page_private(page, (unsigned long)a); |
7fab479b DK |
102 | SetPagePrivate(page); |
103 | kmap(page); | |
104 | } | |
105 | ||
106 | if (mp) { | |
107 | l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; | |
108 | index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); | |
109 | a->mp_count++; | |
110 | a->mp[index] = mp; | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static inline void remove_metapage(struct page *page, struct metapage *mp) | |
117 | { | |
118 | struct meta_anchor *a = mp_anchor(page); | |
119 | int l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; | |
120 | int index; | |
121 | ||
122 | index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); | |
123 | ||
124 | BUG_ON(a->mp[index] != mp); | |
125 | ||
126 | a->mp[index] = NULL; | |
127 | if (--a->mp_count == 0) { | |
128 | kfree(a); | |
4c21e2f2 | 129 | set_page_private(page, 0); |
7fab479b DK |
130 | ClearPagePrivate(page); |
131 | kunmap(page); | |
132 | } | |
133 | } | |
134 | ||
135 | static inline void inc_io(struct page *page) | |
136 | { | |
137 | atomic_inc(&mp_anchor(page)->io_count); | |
138 | } | |
139 | ||
140 | static inline void dec_io(struct page *page, void (*handler) (struct page *)) | |
141 | { | |
142 | if (atomic_dec_and_test(&mp_anchor(page)->io_count)) | |
143 | handler(page); | |
144 | } | |
145 | ||
146 | #else | |
967c9ec4 | 147 | static inline struct metapage *page_to_mp(struct page *page, int offset) |
7fab479b | 148 | { |
4c21e2f2 | 149 | return PagePrivate(page) ? (struct metapage *)page_private(page) : NULL; |
7fab479b DK |
150 | } |
151 | ||
152 | static inline int insert_metapage(struct page *page, struct metapage *mp) | |
153 | { | |
154 | if (mp) { | |
4c21e2f2 | 155 | set_page_private(page, (unsigned long)mp); |
7fab479b DK |
156 | SetPagePrivate(page); |
157 | kmap(page); | |
158 | } | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static inline void remove_metapage(struct page *page, struct metapage *mp) | |
163 | { | |
4c21e2f2 | 164 | set_page_private(page, 0); |
7fab479b DK |
165 | ClearPagePrivate(page); |
166 | kunmap(page); | |
167 | } | |
168 | ||
169 | #define inc_io(page) do {} while(0) | |
170 | #define dec_io(page, handler) handler(page) | |
171 | ||
172 | #endif | |
173 | ||
27496a8c | 174 | static inline struct metapage *alloc_metapage(gfp_t gfp_mask) |
1da177e4 | 175 | { |
ee146245 DR |
176 | struct metapage *mp = mempool_alloc(metapage_mempool, gfp_mask); |
177 | ||
178 | if (mp) { | |
179 | mp->lid = 0; | |
180 | mp->lsn = 0; | |
181 | mp->data = NULL; | |
182 | mp->clsn = 0; | |
183 | mp->log = NULL; | |
184 | init_waitqueue_head(&mp->wait); | |
185 | } | |
186 | return mp; | |
1da177e4 LT |
187 | } |
188 | ||
189 | static inline void free_metapage(struct metapage *mp) | |
190 | { | |
1da177e4 LT |
191 | mempool_free(mp, metapage_mempool); |
192 | } | |
193 | ||
194 | int __init metapage_init(void) | |
195 | { | |
196 | /* | |
197 | * Allocate the metapage structures | |
198 | */ | |
199 | metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage), | |
ee146245 | 200 | 0, 0, NULL); |
1da177e4 LT |
201 | if (metapage_cache == NULL) |
202 | return -ENOMEM; | |
203 | ||
93d2341c MD |
204 | metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES, |
205 | metapage_cache); | |
1da177e4 LT |
206 | |
207 | if (metapage_mempool == NULL) { | |
208 | kmem_cache_destroy(metapage_cache); | |
209 | return -ENOMEM; | |
210 | } | |
1da177e4 LT |
211 | |
212 | return 0; | |
213 | } | |
214 | ||
215 | void metapage_exit(void) | |
216 | { | |
217 | mempool_destroy(metapage_mempool); | |
218 | kmem_cache_destroy(metapage_cache); | |
219 | } | |
220 | ||
7fab479b DK |
221 | static inline void drop_metapage(struct page *page, struct metapage *mp) |
222 | { | |
223 | if (mp->count || mp->nohomeok || test_bit(META_dirty, &mp->flag) || | |
224 | test_bit(META_io, &mp->flag)) | |
225 | return; | |
226 | remove_metapage(page, mp); | |
227 | INCREMENT(mpStat.pagefree); | |
228 | free_metapage(mp); | |
229 | } | |
230 | ||
1da177e4 | 231 | /* |
7fab479b | 232 | * Metapage address space operations |
1da177e4 | 233 | */ |
7fab479b DK |
234 | |
235 | static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock, | |
967c9ec4 | 236 | int *len) |
1da177e4 | 237 | { |
7fab479b DK |
238 | int rc = 0; |
239 | int xflag; | |
240 | s64 xaddr; | |
ba52de12 | 241 | sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
7fab479b DK |
242 | inode->i_blkbits; |
243 | ||
244 | if (lblock >= file_blocks) | |
245 | return 0; | |
246 | if (lblock + *len > file_blocks) | |
247 | *len = file_blocks - lblock; | |
248 | ||
249 | if (inode->i_ino) { | |
250 | rc = xtLookup(inode, (s64)lblock, *len, &xflag, &xaddr, len, 0); | |
251 | if ((rc == 0) && *len) | |
252 | lblock = (sector_t)xaddr; | |
253 | else | |
254 | lblock = 0; | |
255 | } /* else no mapping */ | |
256 | ||
257 | return lblock; | |
1da177e4 LT |
258 | } |
259 | ||
7fab479b | 260 | static void last_read_complete(struct page *page) |
1da177e4 | 261 | { |
7fab479b DK |
262 | if (!PageError(page)) |
263 | SetPageUptodate(page); | |
264 | unlock_page(page); | |
265 | } | |
266 | ||
4246a0b6 | 267 | static void metapage_read_end_io(struct bio *bio) |
7fab479b DK |
268 | { |
269 | struct page *page = bio->bi_private; | |
270 | ||
4e4cbee9 | 271 | if (bio->bi_status) { |
7fab479b DK |
272 | printk(KERN_ERR "metapage_read_end_io: I/O error\n"); |
273 | SetPageError(page); | |
1da177e4 LT |
274 | } |
275 | ||
7fab479b DK |
276 | dec_io(page, last_read_complete); |
277 | bio_put(bio); | |
1da177e4 LT |
278 | } |
279 | ||
7fab479b | 280 | static void remove_from_logsync(struct metapage *mp) |
1da177e4 | 281 | { |
7fab479b DK |
282 | struct jfs_log *log = mp->log; |
283 | unsigned long flags; | |
284 | /* | |
285 | * This can race. Recheck that log hasn't been set to null, and after | |
286 | * acquiring logsync lock, recheck lsn | |
287 | */ | |
288 | if (!log) | |
289 | return; | |
290 | ||
291 | LOGSYNC_LOCK(log, flags); | |
292 | if (mp->lsn) { | |
293 | mp->log = NULL; | |
294 | mp->lsn = 0; | |
295 | mp->clsn = 0; | |
296 | log->count--; | |
297 | list_del(&mp->synclist); | |
298 | } | |
299 | LOGSYNC_UNLOCK(log, flags); | |
300 | } | |
1da177e4 | 301 | |
7fab479b DK |
302 | static void last_write_complete(struct page *page) |
303 | { | |
304 | struct metapage *mp; | |
305 | unsigned int offset; | |
306 | ||
09cbfeaf | 307 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
7fab479b DK |
308 | mp = page_to_mp(page, offset); |
309 | if (mp && test_bit(META_io, &mp->flag)) { | |
310 | if (mp->lsn) | |
311 | remove_from_logsync(mp); | |
312 | clear_bit(META_io, &mp->flag); | |
313 | } | |
314 | /* | |
315 | * I'd like to call drop_metapage here, but I don't think it's | |
316 | * safe unless I have the page locked | |
317 | */ | |
318 | } | |
319 | end_page_writeback(page); | |
1da177e4 LT |
320 | } |
321 | ||
4246a0b6 | 322 | static void metapage_write_end_io(struct bio *bio) |
1da177e4 | 323 | { |
7fab479b DK |
324 | struct page *page = bio->bi_private; |
325 | ||
326 | BUG_ON(!PagePrivate(page)); | |
327 | ||
4e4cbee9 | 328 | if (bio->bi_status) { |
7fab479b DK |
329 | printk(KERN_ERR "metapage_write_end_io: I/O error\n"); |
330 | SetPageError(page); | |
331 | } | |
332 | dec_io(page, last_write_complete); | |
333 | bio_put(bio); | |
7fab479b DK |
334 | } |
335 | ||
336 | static int metapage_writepage(struct page *page, struct writeback_control *wbc) | |
337 | { | |
338 | struct bio *bio = NULL; | |
967c9ec4 | 339 | int block_offset; /* block offset of mp within page */ |
7fab479b | 340 | struct inode *inode = page->mapping->host; |
967c9ec4 DK |
341 | int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage; |
342 | int len; | |
343 | int xlen; | |
7fab479b DK |
344 | struct metapage *mp; |
345 | int redirty = 0; | |
346 | sector_t lblock; | |
29a424f2 | 347 | int nr_underway = 0; |
7fab479b DK |
348 | sector_t pblock; |
349 | sector_t next_block = 0; | |
350 | sector_t page_start; | |
351 | unsigned long bio_bytes = 0; | |
352 | unsigned long bio_offset = 0; | |
967c9ec4 | 353 | int offset; |
1ad53a98 | 354 | int bad_blocks = 0; |
7fab479b DK |
355 | |
356 | page_start = (sector_t)page->index << | |
09cbfeaf | 357 | (PAGE_SHIFT - inode->i_blkbits); |
7fab479b DK |
358 | BUG_ON(!PageLocked(page)); |
359 | BUG_ON(PageWriteback(page)); | |
29a424f2 | 360 | set_page_writeback(page); |
7fab479b | 361 | |
09cbfeaf | 362 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
7fab479b DK |
363 | mp = page_to_mp(page, offset); |
364 | ||
365 | if (!mp || !test_bit(META_dirty, &mp->flag)) | |
366 | continue; | |
367 | ||
368 | if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) { | |
369 | redirty = 1; | |
ac17b8b5 DK |
370 | /* |
371 | * Make sure this page isn't blocked indefinitely. | |
372 | * If the journal isn't undergoing I/O, push it | |
373 | */ | |
374 | if (mp->log && !(mp->log->cflag & logGC_PAGEOUT)) | |
375 | jfs_flush_journal(mp->log, 0); | |
7fab479b DK |
376 | continue; |
377 | } | |
378 | ||
379 | clear_bit(META_dirty, &mp->flag); | |
1ad53a98 | 380 | set_bit(META_io, &mp->flag); |
7fab479b DK |
381 | block_offset = offset >> inode->i_blkbits; |
382 | lblock = page_start + block_offset; | |
383 | if (bio) { | |
384 | if (xlen && lblock == next_block) { | |
385 | /* Contiguous, in memory & on disk */ | |
386 | len = min(xlen, blocks_per_mp); | |
387 | xlen -= len; | |
388 | bio_bytes += len << inode->i_blkbits; | |
7fab479b DK |
389 | continue; |
390 | } | |
391 | /* Not contiguous */ | |
392 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < | |
393 | bio_bytes) | |
394 | goto add_failed; | |
395 | /* | |
396 | * Increment counter before submitting i/o to keep | |
397 | * count from hitting zero before we're through | |
398 | */ | |
399 | inc_io(page); | |
4f024f37 | 400 | if (!bio->bi_iter.bi_size) |
7fab479b | 401 | goto dump_bio; |
4e49ea4a | 402 | submit_bio(bio); |
29a424f2 | 403 | nr_underway++; |
7fab479b | 404 | bio = NULL; |
29a424f2 | 405 | } else |
7fab479b | 406 | inc_io(page); |
09cbfeaf | 407 | xlen = (PAGE_SIZE - offset) >> inode->i_blkbits; |
7fab479b DK |
408 | pblock = metapage_get_blocks(inode, lblock, &xlen); |
409 | if (!pblock) { | |
7fab479b | 410 | printk(KERN_ERR "JFS: metapage_get_blocks failed\n"); |
1ad53a98 DK |
411 | /* |
412 | * We already called inc_io(), but can't cancel it | |
413 | * with dec_io() until we're done with the page | |
414 | */ | |
415 | bad_blocks++; | |
7fab479b DK |
416 | continue; |
417 | } | |
967c9ec4 | 418 | len = min(xlen, (int)JFS_SBI(inode->i_sb)->nbperpage); |
7fab479b DK |
419 | |
420 | bio = bio_alloc(GFP_NOFS, 1); | |
74d46992 | 421 | bio_set_dev(bio, inode->i_sb->s_bdev); |
4f024f37 | 422 | bio->bi_iter.bi_sector = pblock << (inode->i_blkbits - 9); |
7fab479b DK |
423 | bio->bi_end_io = metapage_write_end_io; |
424 | bio->bi_private = page; | |
95fe6c1a | 425 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
7fab479b DK |
426 | |
427 | /* Don't call bio_add_page yet, we may add to this vec */ | |
428 | bio_offset = offset; | |
429 | bio_bytes = len << inode->i_blkbits; | |
430 | ||
431 | xlen -= len; | |
432 | next_block = lblock + len; | |
433 | } | |
434 | if (bio) { | |
435 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes) | |
436 | goto add_failed; | |
4f024f37 | 437 | if (!bio->bi_iter.bi_size) |
7fab479b | 438 | goto dump_bio; |
63f83c9f | 439 | |
4e49ea4a | 440 | submit_bio(bio); |
29a424f2 | 441 | nr_underway++; |
7fab479b DK |
442 | } |
443 | if (redirty) | |
444 | redirty_page_for_writepage(wbc, page); | |
445 | ||
446 | unlock_page(page); | |
447 | ||
1ad53a98 DK |
448 | if (bad_blocks) |
449 | goto err_out; | |
450 | ||
29a424f2 DK |
451 | if (nr_underway == 0) |
452 | end_page_writeback(page); | |
453 | ||
7fab479b DK |
454 | return 0; |
455 | add_failed: | |
456 | /* We should never reach here, since we're only adding one vec */ | |
457 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
458 | goto skip; | |
459 | dump_bio: | |
288e4d83 DK |
460 | print_hex_dump(KERN_ERR, "JFS: dump of bio: ", DUMP_PREFIX_ADDRESS, 16, |
461 | 4, bio, sizeof(*bio), 0); | |
7fab479b DK |
462 | skip: |
463 | bio_put(bio); | |
464 | unlock_page(page); | |
465 | dec_io(page, last_write_complete); | |
1ad53a98 DK |
466 | err_out: |
467 | while (bad_blocks--) | |
468 | dec_io(page, last_write_complete); | |
7fab479b DK |
469 | return -EIO; |
470 | } | |
471 | ||
472 | static int metapage_readpage(struct file *fp, struct page *page) | |
473 | { | |
474 | struct inode *inode = page->mapping->host; | |
475 | struct bio *bio = NULL; | |
967c9ec4 | 476 | int block_offset; |
24addd84 | 477 | int blocks_per_page = i_blocks_per_page(inode, page); |
7fab479b DK |
478 | sector_t page_start; /* address of page in fs blocks */ |
479 | sector_t pblock; | |
967c9ec4 | 480 | int xlen; |
7fab479b | 481 | unsigned int len; |
967c9ec4 | 482 | int offset; |
7fab479b DK |
483 | |
484 | BUG_ON(!PageLocked(page)); | |
485 | page_start = (sector_t)page->index << | |
09cbfeaf | 486 | (PAGE_SHIFT - inode->i_blkbits); |
7fab479b DK |
487 | |
488 | block_offset = 0; | |
489 | while (block_offset < blocks_per_page) { | |
490 | xlen = blocks_per_page - block_offset; | |
491 | pblock = metapage_get_blocks(inode, page_start + block_offset, | |
492 | &xlen); | |
493 | if (pblock) { | |
494 | if (!PagePrivate(page)) | |
495 | insert_metapage(page, NULL); | |
496 | inc_io(page); | |
497 | if (bio) | |
4e49ea4a | 498 | submit_bio(bio); |
7fab479b DK |
499 | |
500 | bio = bio_alloc(GFP_NOFS, 1); | |
74d46992 | 501 | bio_set_dev(bio, inode->i_sb->s_bdev); |
4f024f37 KO |
502 | bio->bi_iter.bi_sector = |
503 | pblock << (inode->i_blkbits - 9); | |
7fab479b DK |
504 | bio->bi_end_io = metapage_read_end_io; |
505 | bio->bi_private = page; | |
95fe6c1a | 506 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
7fab479b DK |
507 | len = xlen << inode->i_blkbits; |
508 | offset = block_offset << inode->i_blkbits; | |
509 | if (bio_add_page(bio, page, len, offset) < len) | |
510 | goto add_failed; | |
511 | block_offset += xlen; | |
512 | } else | |
513 | block_offset++; | |
1da177e4 | 514 | } |
7fab479b | 515 | if (bio) |
4e49ea4a | 516 | submit_bio(bio); |
7fab479b DK |
517 | else |
518 | unlock_page(page); | |
519 | ||
520 | return 0; | |
1da177e4 | 521 | |
7fab479b DK |
522 | add_failed: |
523 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
524 | bio_put(bio); | |
525 | dec_io(page, last_read_complete); | |
526 | return -EIO; | |
1da177e4 LT |
527 | } |
528 | ||
27496a8c | 529 | static int metapage_releasepage(struct page *page, gfp_t gfp_mask) |
7fab479b DK |
530 | { |
531 | struct metapage *mp; | |
b964638f | 532 | int ret = 1; |
967c9ec4 | 533 | int offset; |
7fab479b | 534 | |
09cbfeaf | 535 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
7fab479b DK |
536 | mp = page_to_mp(page, offset); |
537 | ||
538 | if (!mp) | |
539 | continue; | |
540 | ||
541 | jfs_info("metapage_releasepage: mp = 0x%p", mp); | |
b964638f DK |
542 | if (mp->count || mp->nohomeok || |
543 | test_bit(META_dirty, &mp->flag)) { | |
7fab479b DK |
544 | jfs_info("count = %ld, nohomeok = %d", mp->count, |
545 | mp->nohomeok); | |
b964638f | 546 | ret = 0; |
7fab479b DK |
547 | continue; |
548 | } | |
7fab479b DK |
549 | if (mp->lsn) |
550 | remove_from_logsync(mp); | |
551 | remove_metapage(page, mp); | |
552 | INCREMENT(mpStat.pagefree); | |
553 | free_metapage(mp); | |
554 | } | |
b964638f | 555 | return ret; |
7fab479b DK |
556 | } |
557 | ||
d47992f8 LC |
558 | static void metapage_invalidatepage(struct page *page, unsigned int offset, |
559 | unsigned int length) | |
7fab479b | 560 | { |
09cbfeaf | 561 | BUG_ON(offset || length < PAGE_SIZE); |
7fab479b | 562 | |
2ff28e22 | 563 | BUG_ON(PageWriteback(page)); |
7fab479b | 564 | |
2ff28e22 | 565 | metapage_releasepage(page, 0); |
7fab479b DK |
566 | } |
567 | ||
f5e54d6e | 568 | const struct address_space_operations jfs_metapage_aops = { |
7fab479b DK |
569 | .readpage = metapage_readpage, |
570 | .writepage = metapage_writepage, | |
7fab479b DK |
571 | .releasepage = metapage_releasepage, |
572 | .invalidatepage = metapage_invalidatepage, | |
573 | .set_page_dirty = __set_page_dirty_nobuffers, | |
574 | }; | |
575 | ||
1da177e4 LT |
576 | struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, |
577 | unsigned int size, int absolute, | |
578 | unsigned long new) | |
579 | { | |
1da177e4 LT |
580 | int l2BlocksPerPage; |
581 | int l2bsize; | |
582 | struct address_space *mapping; | |
7fab479b DK |
583 | struct metapage *mp = NULL; |
584 | struct page *page; | |
1da177e4 LT |
585 | unsigned long page_index; |
586 | unsigned long page_offset; | |
587 | ||
7fab479b DK |
588 | jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d", |
589 | inode->i_ino, lblock, absolute); | |
590 | ||
591 | l2bsize = inode->i_blkbits; | |
09cbfeaf | 592 | l2BlocksPerPage = PAGE_SHIFT - l2bsize; |
7fab479b DK |
593 | page_index = lblock >> l2BlocksPerPage; |
594 | page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; | |
09cbfeaf | 595 | if ((page_offset + size) > PAGE_SIZE) { |
7fab479b DK |
596 | jfs_err("MetaData crosses page boundary!!"); |
597 | jfs_err("lblock = %lx, size = %d", lblock, size); | |
598 | dump_stack(); | |
599 | return NULL; | |
600 | } | |
1da177e4 | 601 | if (absolute) |
7fab479b | 602 | mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping; |
1da177e4 LT |
603 | else { |
604 | /* | |
605 | * If an nfs client tries to read an inode that is larger | |
606 | * than any existing inodes, we may try to read past the | |
607 | * end of the inode map | |
608 | */ | |
609 | if ((lblock << inode->i_blkbits) >= inode->i_size) | |
610 | return NULL; | |
611 | mapping = inode->i_mapping; | |
612 | } | |
613 | ||
09cbfeaf | 614 | if (new && (PSIZE == PAGE_SIZE)) { |
7fab479b DK |
615 | page = grab_cache_page(mapping, page_index); |
616 | if (!page) { | |
617 | jfs_err("grab_cache_page failed!"); | |
618 | return NULL; | |
619 | } | |
620 | SetPageUptodate(page); | |
621 | } else { | |
090d2b18 | 622 | page = read_mapping_page(mapping, page_index, NULL); |
c40c2024 | 623 | if (IS_ERR(page) || !PageUptodate(page)) { |
090d2b18 | 624 | jfs_err("read_mapping_page failed!"); |
7fab479b DK |
625 | return NULL; |
626 | } | |
627 | lock_page(page); | |
628 | } | |
629 | ||
630 | mp = page_to_mp(page, page_offset); | |
1da177e4 | 631 | if (mp) { |
7fab479b DK |
632 | if (mp->logical_size != size) { |
633 | jfs_error(inode->i_sb, | |
eb8630d7 | 634 | "get_mp->logical_size != size\n"); |
7fab479b DK |
635 | jfs_err("logical_size = %d, size = %d", |
636 | mp->logical_size, size); | |
637 | dump_stack(); | |
63f83c9f | 638 | goto unlock; |
1da177e4 LT |
639 | } |
640 | mp->count++; | |
641 | lock_metapage(mp); | |
1da177e4 LT |
642 | if (test_bit(META_discard, &mp->flag)) { |
643 | if (!new) { | |
644 | jfs_error(inode->i_sb, | |
eb8630d7 | 645 | "using a discarded metapage\n"); |
7fab479b | 646 | discard_metapage(mp); |
63f83c9f | 647 | goto unlock; |
1da177e4 LT |
648 | } |
649 | clear_bit(META_discard, &mp->flag); | |
650 | } | |
1da177e4 | 651 | } else { |
7fab479b DK |
652 | INCREMENT(mpStat.pagealloc); |
653 | mp = alloc_metapage(GFP_NOFS); | |
88a96fa8 JH |
654 | if (!mp) |
655 | goto unlock; | |
7fab479b | 656 | mp->page = page; |
11ab8319 | 657 | mp->sb = inode->i_sb; |
1da177e4 | 658 | mp->flag = 0; |
1da177e4 LT |
659 | mp->xflag = COMMIT_PAGE; |
660 | mp->count = 1; | |
7fab479b | 661 | mp->nohomeok = 0; |
1da177e4 | 662 | mp->logical_size = size; |
7fab479b DK |
663 | mp->data = page_address(page) + page_offset; |
664 | mp->index = lblock; | |
665 | if (unlikely(insert_metapage(page, mp))) { | |
666 | free_metapage(mp); | |
667 | goto unlock; | |
1da177e4 | 668 | } |
7fab479b | 669 | lock_metapage(mp); |
1da177e4 LT |
670 | } |
671 | ||
7fab479b DK |
672 | if (new) { |
673 | jfs_info("zeroing mp = 0x%p", mp); | |
1da177e4 | 674 | memset(mp->data, 0, PSIZE); |
7fab479b | 675 | } |
1da177e4 | 676 | |
7fab479b DK |
677 | unlock_page(page); |
678 | jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data); | |
1da177e4 LT |
679 | return mp; |
680 | ||
7fab479b DK |
681 | unlock: |
682 | unlock_page(page); | |
1da177e4 LT |
683 | return NULL; |
684 | } | |
685 | ||
7fab479b | 686 | void grab_metapage(struct metapage * mp) |
1da177e4 | 687 | { |
7fab479b | 688 | jfs_info("grab_metapage: mp = 0x%p", mp); |
09cbfeaf | 689 | get_page(mp->page); |
7fab479b | 690 | lock_page(mp->page); |
1da177e4 | 691 | mp->count++; |
7fab479b DK |
692 | lock_metapage(mp); |
693 | unlock_page(mp->page); | |
1da177e4 LT |
694 | } |
695 | ||
7fab479b | 696 | void force_metapage(struct metapage *mp) |
1da177e4 | 697 | { |
7fab479b DK |
698 | struct page *page = mp->page; |
699 | jfs_info("force_metapage: mp = 0x%p", mp); | |
700 | set_bit(META_forcewrite, &mp->flag); | |
701 | clear_bit(META_sync, &mp->flag); | |
09cbfeaf | 702 | get_page(page); |
7fab479b DK |
703 | lock_page(page); |
704 | set_page_dirty(page); | |
11ab8319 DK |
705 | if (write_one_page(page)) |
706 | jfs_error(mp->sb, "write_one_page() failed\n"); | |
7fab479b | 707 | clear_bit(META_forcewrite, &mp->flag); |
09cbfeaf | 708 | put_page(page); |
7fab479b | 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 | } | |
09cbfeaf | 723 | get_page(mp->page); |
7fab479b DK |
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); | |
09cbfeaf | 743 | put_page(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); |
11ab8319 DK |
751 | if (write_one_page(page)) |
752 | jfs_error(mp->sb, "write_one_page() failed\n"); | |
7fab479b | 753 | lock_page(page); /* write_one_page unlocks the page */ |
1da177e4 | 754 | } |
7fab479b DK |
755 | } else if (mp->lsn) /* discard_metapage doesn't remove it */ |
756 | remove_from_logsync(mp); | |
1da177e4 | 757 | |
7fab479b DK |
758 | /* Try to keep metapages from using up too much memory */ |
759 | drop_metapage(page, mp); | |
d0e671a9 | 760 | |
7fab479b | 761 | unlock_page(page); |
09cbfeaf | 762 | put_page(page); |
1da177e4 LT |
763 | } |
764 | ||
765 | void __invalidate_metapages(struct inode *ip, s64 addr, int len) | |
766 | { | |
7fab479b | 767 | sector_t lblock; |
09cbfeaf | 768 | int l2BlocksPerPage = PAGE_SHIFT - ip->i_blkbits; |
7fab479b | 769 | int BlocksPerPage = 1 << l2BlocksPerPage; |
1da177e4 | 770 | /* All callers are interested in block device's mapping */ |
7fab479b DK |
771 | struct address_space *mapping = |
772 | JFS_SBI(ip->i_sb)->direct_inode->i_mapping; | |
1da177e4 LT |
773 | struct metapage *mp; |
774 | struct page *page; | |
7fab479b | 775 | unsigned int offset; |
1da177e4 LT |
776 | |
777 | /* | |
7fab479b | 778 | * Mark metapages to discard. They will eventually be |
1da177e4 LT |
779 | * released, but should not be written. |
780 | */ | |
7fab479b DK |
781 | for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len; |
782 | lblock += BlocksPerPage) { | |
783 | page = find_lock_page(mapping, lblock >> l2BlocksPerPage); | |
784 | if (!page) | |
785 | continue; | |
09cbfeaf | 786 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
7fab479b DK |
787 | mp = page_to_mp(page, offset); |
788 | if (!mp) | |
789 | continue; | |
790 | if (mp->index < addr) | |
791 | continue; | |
792 | if (mp->index >= addr + len) | |
793 | break; | |
1da177e4 LT |
794 | |
795 | clear_bit(META_dirty, &mp->flag); | |
796 | set_bit(META_discard, &mp->flag); | |
7fab479b DK |
797 | if (mp->lsn) |
798 | remove_from_logsync(mp); | |
1da177e4 | 799 | } |
7fab479b | 800 | unlock_page(page); |
09cbfeaf | 801 | put_page(page); |
1da177e4 LT |
802 | } |
803 | } | |
804 | ||
805 | #ifdef CONFIG_JFS_STATISTICS | |
07a3b8ed | 806 | int jfs_mpstat_proc_show(struct seq_file *m, void *v) |
1da177e4 | 807 | { |
b2e03ca7 | 808 | seq_printf(m, |
1da177e4 LT |
809 | "JFS Metapage statistics\n" |
810 | "=======================\n" | |
811 | "page allocations = %d\n" | |
812 | "page frees = %d\n" | |
813 | "lock waits = %d\n", | |
814 | mpStat.pagealloc, | |
815 | mpStat.pagefree, | |
816 | mpStat.lockwait); | |
b2e03ca7 AD |
817 | return 0; |
818 | } | |
1da177e4 | 819 | #endif |