Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
16 | #include "jfs_incore.h" |
17 | #include "jfs_superblock.h" | |
18 | #include "jfs_filsys.h" | |
19 | #include "jfs_metapage.h" | |
20 | #include "jfs_txnmgr.h" | |
21 | #include "jfs_debug.h" | |
22 | ||
1da177e4 LT |
23 | #ifdef CONFIG_JFS_STATISTICS |
24 | static struct { | |
25 | uint pagealloc; /* # of page allocations */ | |
26 | uint pagefree; /* # of page frees */ | |
27 | uint lockwait; /* # of sleeping lock_metapage() calls */ | |
28 | } mpStat; | |
29 | #endif | |
30 | ||
7fab479b | 31 | #define metapage_locked(mp) test_bit(META_locked, &(mp)->flag) |
54af6233 | 32 | #define trylock_metapage(mp) test_and_set_bit_lock(META_locked, &(mp)->flag) |
1da177e4 LT |
33 | |
34 | static inline void unlock_metapage(struct metapage *mp) | |
35 | { | |
54af6233 | 36 | clear_bit_unlock(META_locked, &mp->flag); |
1da177e4 LT |
37 | wake_up(&mp->wait); |
38 | } | |
39 | ||
7fab479b | 40 | static inline void __lock_metapage(struct metapage *mp) |
1da177e4 LT |
41 | { |
42 | DECLARE_WAITQUEUE(wait, current); | |
1da177e4 | 43 | INCREMENT(mpStat.lockwait); |
1da177e4 LT |
44 | add_wait_queue_exclusive(&mp->wait, &wait); |
45 | do { | |
46 | set_current_state(TASK_UNINTERRUPTIBLE); | |
47 | if (metapage_locked(mp)) { | |
7fab479b | 48 | unlock_page(mp->page); |
4aa0d230 | 49 | io_schedule(); |
7fab479b | 50 | lock_page(mp->page); |
1da177e4 LT |
51 | } |
52 | } while (trylock_metapage(mp)); | |
53 | __set_current_state(TASK_RUNNING); | |
54 | remove_wait_queue(&mp->wait, &wait); | |
55 | } | |
56 | ||
7fab479b DK |
57 | /* |
58 | * Must have mp->page locked | |
59 | */ | |
1da177e4 LT |
60 | static inline void lock_metapage(struct metapage *mp) |
61 | { | |
62 | if (trylock_metapage(mp)) | |
63 | __lock_metapage(mp); | |
64 | } | |
65 | ||
66 | #define METAPOOL_MIN_PAGES 32 | |
e18b890b | 67 | static struct kmem_cache *metapage_cache; |
1da177e4 LT |
68 | static mempool_t *metapage_mempool; |
69 | ||
09cbfeaf | 70 | #define MPS_PER_PAGE (PAGE_SIZE >> L2PSIZE) |
7fab479b DK |
71 | |
72 | #if MPS_PER_PAGE > 1 | |
73 | ||
74 | struct meta_anchor { | |
75 | int mp_count; | |
76 | atomic_t io_count; | |
77 | struct metapage *mp[MPS_PER_PAGE]; | |
78 | }; | |
4c21e2f2 | 79 | #define mp_anchor(page) ((struct meta_anchor *)page_private(page)) |
7fab479b | 80 | |
967c9ec4 | 81 | static inline struct metapage *page_to_mp(struct page *page, int offset) |
7fab479b DK |
82 | { |
83 | if (!PagePrivate(page)) | |
84 | return NULL; | |
85 | return mp_anchor(page)->mp[offset >> L2PSIZE]; | |
86 | } | |
87 | ||
88 | static inline int insert_metapage(struct page *page, struct metapage *mp) | |
89 | { | |
90 | struct meta_anchor *a; | |
91 | int index; | |
92 | int l2mp_blocks; /* log2 blocks per metapage */ | |
93 | ||
94 | if (PagePrivate(page)) | |
95 | a = mp_anchor(page); | |
96 | else { | |
5b3030e3 | 97 | a = kzalloc(sizeof(struct meta_anchor), GFP_NOFS); |
7fab479b DK |
98 | if (!a) |
99 | return -ENOMEM; | |
4c21e2f2 | 100 | set_page_private(page, (unsigned long)a); |
7fab479b DK |
101 | SetPagePrivate(page); |
102 | kmap(page); | |
103 | } | |
104 | ||
105 | if (mp) { | |
106 | l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; | |
107 | index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); | |
108 | a->mp_count++; | |
109 | a->mp[index] = mp; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static inline void remove_metapage(struct page *page, struct metapage *mp) | |
116 | { | |
117 | struct meta_anchor *a = mp_anchor(page); | |
118 | int l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; | |
119 | int index; | |
120 | ||
121 | index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); | |
122 | ||
123 | BUG_ON(a->mp[index] != mp); | |
124 | ||
125 | a->mp[index] = NULL; | |
126 | if (--a->mp_count == 0) { | |
127 | kfree(a); | |
4c21e2f2 | 128 | set_page_private(page, 0); |
7fab479b DK |
129 | ClearPagePrivate(page); |
130 | kunmap(page); | |
131 | } | |
132 | } | |
133 | ||
134 | static inline void inc_io(struct page *page) | |
135 | { | |
136 | atomic_inc(&mp_anchor(page)->io_count); | |
137 | } | |
138 | ||
139 | static inline void dec_io(struct page *page, void (*handler) (struct page *)) | |
140 | { | |
141 | if (atomic_dec_and_test(&mp_anchor(page)->io_count)) | |
142 | handler(page); | |
143 | } | |
144 | ||
145 | #else | |
967c9ec4 | 146 | static inline struct metapage *page_to_mp(struct page *page, int offset) |
7fab479b | 147 | { |
4c21e2f2 | 148 | return PagePrivate(page) ? (struct metapage *)page_private(page) : NULL; |
7fab479b DK |
149 | } |
150 | ||
151 | static inline int insert_metapage(struct page *page, struct metapage *mp) | |
152 | { | |
153 | if (mp) { | |
4c21e2f2 | 154 | set_page_private(page, (unsigned long)mp); |
7fab479b DK |
155 | SetPagePrivate(page); |
156 | kmap(page); | |
157 | } | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static inline void remove_metapage(struct page *page, struct metapage *mp) | |
162 | { | |
4c21e2f2 | 163 | set_page_private(page, 0); |
7fab479b DK |
164 | ClearPagePrivate(page); |
165 | kunmap(page); | |
166 | } | |
167 | ||
168 | #define inc_io(page) do {} while(0) | |
169 | #define dec_io(page, handler) handler(page) | |
170 | ||
171 | #endif | |
172 | ||
27496a8c | 173 | static inline struct metapage *alloc_metapage(gfp_t gfp_mask) |
1da177e4 | 174 | { |
ee146245 DR |
175 | struct metapage *mp = mempool_alloc(metapage_mempool, gfp_mask); |
176 | ||
177 | if (mp) { | |
178 | mp->lid = 0; | |
179 | mp->lsn = 0; | |
180 | mp->data = NULL; | |
181 | mp->clsn = 0; | |
182 | mp->log = NULL; | |
183 | init_waitqueue_head(&mp->wait); | |
184 | } | |
185 | return mp; | |
1da177e4 LT |
186 | } |
187 | ||
188 | static inline void free_metapage(struct metapage *mp) | |
189 | { | |
1da177e4 LT |
190 | mempool_free(mp, metapage_mempool); |
191 | } | |
192 | ||
193 | int __init metapage_init(void) | |
194 | { | |
195 | /* | |
196 | * Allocate the metapage structures | |
197 | */ | |
198 | metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage), | |
ee146245 | 199 | 0, 0, NULL); |
1da177e4 LT |
200 | if (metapage_cache == NULL) |
201 | return -ENOMEM; | |
202 | ||
93d2341c MD |
203 | metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES, |
204 | metapage_cache); | |
1da177e4 LT |
205 | |
206 | if (metapage_mempool == NULL) { | |
207 | kmem_cache_destroy(metapage_cache); | |
208 | return -ENOMEM; | |
209 | } | |
1da177e4 LT |
210 | |
211 | return 0; | |
212 | } | |
213 | ||
214 | void metapage_exit(void) | |
215 | { | |
216 | mempool_destroy(metapage_mempool); | |
217 | kmem_cache_destroy(metapage_cache); | |
218 | } | |
219 | ||
7fab479b DK |
220 | static inline void drop_metapage(struct page *page, struct metapage *mp) |
221 | { | |
222 | if (mp->count || mp->nohomeok || test_bit(META_dirty, &mp->flag) || | |
223 | test_bit(META_io, &mp->flag)) | |
224 | return; | |
225 | remove_metapage(page, mp); | |
226 | INCREMENT(mpStat.pagefree); | |
227 | free_metapage(mp); | |
228 | } | |
229 | ||
1da177e4 | 230 | /* |
7fab479b | 231 | * Metapage address space operations |
1da177e4 | 232 | */ |
7fab479b DK |
233 | |
234 | static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock, | |
967c9ec4 | 235 | int *len) |
1da177e4 | 236 | { |
7fab479b DK |
237 | int rc = 0; |
238 | int xflag; | |
239 | s64 xaddr; | |
ba52de12 | 240 | sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
7fab479b DK |
241 | inode->i_blkbits; |
242 | ||
243 | if (lblock >= file_blocks) | |
244 | return 0; | |
245 | if (lblock + *len > file_blocks) | |
246 | *len = file_blocks - lblock; | |
247 | ||
248 | if (inode->i_ino) { | |
249 | rc = xtLookup(inode, (s64)lblock, *len, &xflag, &xaddr, len, 0); | |
250 | if ((rc == 0) && *len) | |
251 | lblock = (sector_t)xaddr; | |
252 | else | |
253 | lblock = 0; | |
254 | } /* else no mapping */ | |
255 | ||
256 | return lblock; | |
1da177e4 LT |
257 | } |
258 | ||
7fab479b | 259 | static void last_read_complete(struct page *page) |
1da177e4 | 260 | { |
7fab479b DK |
261 | if (!PageError(page)) |
262 | SetPageUptodate(page); | |
263 | unlock_page(page); | |
264 | } | |
265 | ||
4246a0b6 | 266 | static void metapage_read_end_io(struct bio *bio) |
7fab479b DK |
267 | { |
268 | struct page *page = bio->bi_private; | |
269 | ||
4e4cbee9 | 270 | if (bio->bi_status) { |
7fab479b DK |
271 | printk(KERN_ERR "metapage_read_end_io: I/O error\n"); |
272 | SetPageError(page); | |
1da177e4 LT |
273 | } |
274 | ||
7fab479b DK |
275 | dec_io(page, last_read_complete); |
276 | bio_put(bio); | |
1da177e4 LT |
277 | } |
278 | ||
7fab479b | 279 | static void remove_from_logsync(struct metapage *mp) |
1da177e4 | 280 | { |
7fab479b DK |
281 | struct jfs_log *log = mp->log; |
282 | unsigned long flags; | |
283 | /* | |
284 | * This can race. Recheck that log hasn't been set to null, and after | |
285 | * acquiring logsync lock, recheck lsn | |
286 | */ | |
287 | if (!log) | |
288 | return; | |
289 | ||
290 | LOGSYNC_LOCK(log, flags); | |
291 | if (mp->lsn) { | |
292 | mp->log = NULL; | |
293 | mp->lsn = 0; | |
294 | mp->clsn = 0; | |
295 | log->count--; | |
296 | list_del(&mp->synclist); | |
297 | } | |
298 | LOGSYNC_UNLOCK(log, flags); | |
299 | } | |
1da177e4 | 300 | |
7fab479b DK |
301 | static void last_write_complete(struct page *page) |
302 | { | |
303 | struct metapage *mp; | |
304 | unsigned int offset; | |
305 | ||
09cbfeaf | 306 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
7fab479b DK |
307 | mp = page_to_mp(page, offset); |
308 | if (mp && test_bit(META_io, &mp->flag)) { | |
309 | if (mp->lsn) | |
310 | remove_from_logsync(mp); | |
311 | clear_bit(META_io, &mp->flag); | |
312 | } | |
313 | /* | |
314 | * I'd like to call drop_metapage here, but I don't think it's | |
315 | * safe unless I have the page locked | |
316 | */ | |
317 | } | |
318 | end_page_writeback(page); | |
1da177e4 LT |
319 | } |
320 | ||
4246a0b6 | 321 | static void metapage_write_end_io(struct bio *bio) |
1da177e4 | 322 | { |
7fab479b DK |
323 | struct page *page = bio->bi_private; |
324 | ||
325 | BUG_ON(!PagePrivate(page)); | |
326 | ||
4e4cbee9 | 327 | if (bio->bi_status) { |
7fab479b DK |
328 | printk(KERN_ERR "metapage_write_end_io: I/O error\n"); |
329 | SetPageError(page); | |
330 | } | |
331 | dec_io(page, last_write_complete); | |
332 | bio_put(bio); | |
7fab479b DK |
333 | } |
334 | ||
335 | static int metapage_writepage(struct page *page, struct writeback_control *wbc) | |
336 | { | |
337 | struct bio *bio = NULL; | |
967c9ec4 | 338 | int block_offset; /* block offset of mp within page */ |
7fab479b | 339 | struct inode *inode = page->mapping->host; |
967c9ec4 DK |
340 | int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage; |
341 | int len; | |
342 | int xlen; | |
7fab479b DK |
343 | struct metapage *mp; |
344 | int redirty = 0; | |
345 | sector_t lblock; | |
29a424f2 | 346 | int nr_underway = 0; |
7fab479b DK |
347 | sector_t pblock; |
348 | sector_t next_block = 0; | |
349 | sector_t page_start; | |
350 | unsigned long bio_bytes = 0; | |
351 | unsigned long bio_offset = 0; | |
967c9ec4 | 352 | int offset; |
1ad53a98 | 353 | int bad_blocks = 0; |
7fab479b DK |
354 | |
355 | page_start = (sector_t)page->index << | |
09cbfeaf | 356 | (PAGE_SHIFT - inode->i_blkbits); |
7fab479b DK |
357 | BUG_ON(!PageLocked(page)); |
358 | BUG_ON(PageWriteback(page)); | |
29a424f2 | 359 | set_page_writeback(page); |
7fab479b | 360 | |
09cbfeaf | 361 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
7fab479b DK |
362 | mp = page_to_mp(page, offset); |
363 | ||
364 | if (!mp || !test_bit(META_dirty, &mp->flag)) | |
365 | continue; | |
366 | ||
367 | if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) { | |
368 | redirty = 1; | |
ac17b8b5 DK |
369 | /* |
370 | * Make sure this page isn't blocked indefinitely. | |
371 | * If the journal isn't undergoing I/O, push it | |
372 | */ | |
373 | if (mp->log && !(mp->log->cflag & logGC_PAGEOUT)) | |
374 | jfs_flush_journal(mp->log, 0); | |
7fab479b DK |
375 | continue; |
376 | } | |
377 | ||
378 | clear_bit(META_dirty, &mp->flag); | |
1ad53a98 | 379 | set_bit(META_io, &mp->flag); |
7fab479b DK |
380 | block_offset = offset >> inode->i_blkbits; |
381 | lblock = page_start + block_offset; | |
382 | if (bio) { | |
383 | if (xlen && lblock == next_block) { | |
384 | /* Contiguous, in memory & on disk */ | |
385 | len = min(xlen, blocks_per_mp); | |
386 | xlen -= len; | |
387 | bio_bytes += len << inode->i_blkbits; | |
7fab479b DK |
388 | continue; |
389 | } | |
390 | /* Not contiguous */ | |
391 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < | |
392 | bio_bytes) | |
393 | goto add_failed; | |
394 | /* | |
395 | * Increment counter before submitting i/o to keep | |
396 | * count from hitting zero before we're through | |
397 | */ | |
398 | inc_io(page); | |
4f024f37 | 399 | if (!bio->bi_iter.bi_size) |
7fab479b | 400 | goto dump_bio; |
4e49ea4a | 401 | submit_bio(bio); |
29a424f2 | 402 | nr_underway++; |
7fab479b | 403 | bio = NULL; |
29a424f2 | 404 | } else |
7fab479b | 405 | inc_io(page); |
09cbfeaf | 406 | xlen = (PAGE_SIZE - offset) >> inode->i_blkbits; |
7fab479b DK |
407 | pblock = metapage_get_blocks(inode, lblock, &xlen); |
408 | if (!pblock) { | |
7fab479b | 409 | printk(KERN_ERR "JFS: metapage_get_blocks failed\n"); |
1ad53a98 DK |
410 | /* |
411 | * We already called inc_io(), but can't cancel it | |
412 | * with dec_io() until we're done with the page | |
413 | */ | |
414 | bad_blocks++; | |
7fab479b DK |
415 | continue; |
416 | } | |
967c9ec4 | 417 | len = min(xlen, (int)JFS_SBI(inode->i_sb)->nbperpage); |
7fab479b DK |
418 | |
419 | bio = bio_alloc(GFP_NOFS, 1); | |
74d46992 | 420 | bio_set_dev(bio, inode->i_sb->s_bdev); |
4f024f37 | 421 | bio->bi_iter.bi_sector = pblock << (inode->i_blkbits - 9); |
7fab479b DK |
422 | bio->bi_end_io = metapage_write_end_io; |
423 | bio->bi_private = page; | |
95fe6c1a | 424 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
7fab479b DK |
425 | |
426 | /* Don't call bio_add_page yet, we may add to this vec */ | |
427 | bio_offset = offset; | |
428 | bio_bytes = len << inode->i_blkbits; | |
429 | ||
430 | xlen -= len; | |
431 | next_block = lblock + len; | |
432 | } | |
433 | if (bio) { | |
434 | if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes) | |
435 | goto add_failed; | |
4f024f37 | 436 | if (!bio->bi_iter.bi_size) |
7fab479b | 437 | goto dump_bio; |
63f83c9f | 438 | |
4e49ea4a | 439 | submit_bio(bio); |
29a424f2 | 440 | nr_underway++; |
7fab479b DK |
441 | } |
442 | if (redirty) | |
443 | redirty_page_for_writepage(wbc, page); | |
444 | ||
445 | unlock_page(page); | |
446 | ||
1ad53a98 DK |
447 | if (bad_blocks) |
448 | goto err_out; | |
449 | ||
29a424f2 DK |
450 | if (nr_underway == 0) |
451 | end_page_writeback(page); | |
452 | ||
7fab479b DK |
453 | return 0; |
454 | add_failed: | |
455 | /* We should never reach here, since we're only adding one vec */ | |
456 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
457 | goto skip; | |
458 | dump_bio: | |
288e4d83 DK |
459 | print_hex_dump(KERN_ERR, "JFS: dump of bio: ", DUMP_PREFIX_ADDRESS, 16, |
460 | 4, bio, sizeof(*bio), 0); | |
7fab479b DK |
461 | skip: |
462 | bio_put(bio); | |
463 | unlock_page(page); | |
464 | dec_io(page, last_write_complete); | |
1ad53a98 DK |
465 | err_out: |
466 | while (bad_blocks--) | |
467 | dec_io(page, last_write_complete); | |
7fab479b DK |
468 | return -EIO; |
469 | } | |
470 | ||
471 | static int metapage_readpage(struct file *fp, struct page *page) | |
472 | { | |
473 | struct inode *inode = page->mapping->host; | |
474 | struct bio *bio = NULL; | |
967c9ec4 | 475 | int block_offset; |
09cbfeaf | 476 | int blocks_per_page = PAGE_SIZE >> inode->i_blkbits; |
7fab479b DK |
477 | sector_t page_start; /* address of page in fs blocks */ |
478 | sector_t pblock; | |
967c9ec4 | 479 | int xlen; |
7fab479b | 480 | unsigned int len; |
967c9ec4 | 481 | int offset; |
7fab479b DK |
482 | |
483 | BUG_ON(!PageLocked(page)); | |
484 | page_start = (sector_t)page->index << | |
09cbfeaf | 485 | (PAGE_SHIFT - inode->i_blkbits); |
7fab479b DK |
486 | |
487 | block_offset = 0; | |
488 | while (block_offset < blocks_per_page) { | |
489 | xlen = blocks_per_page - block_offset; | |
490 | pblock = metapage_get_blocks(inode, page_start + block_offset, | |
491 | &xlen); | |
492 | if (pblock) { | |
493 | if (!PagePrivate(page)) | |
494 | insert_metapage(page, NULL); | |
495 | inc_io(page); | |
496 | if (bio) | |
4e49ea4a | 497 | submit_bio(bio); |
7fab479b DK |
498 | |
499 | bio = bio_alloc(GFP_NOFS, 1); | |
74d46992 | 500 | bio_set_dev(bio, inode->i_sb->s_bdev); |
4f024f37 KO |
501 | bio->bi_iter.bi_sector = |
502 | pblock << (inode->i_blkbits - 9); | |
7fab479b DK |
503 | bio->bi_end_io = metapage_read_end_io; |
504 | bio->bi_private = page; | |
95fe6c1a | 505 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
7fab479b DK |
506 | len = xlen << inode->i_blkbits; |
507 | offset = block_offset << inode->i_blkbits; | |
508 | if (bio_add_page(bio, page, len, offset) < len) | |
509 | goto add_failed; | |
510 | block_offset += xlen; | |
511 | } else | |
512 | block_offset++; | |
1da177e4 | 513 | } |
7fab479b | 514 | if (bio) |
4e49ea4a | 515 | submit_bio(bio); |
7fab479b DK |
516 | else |
517 | unlock_page(page); | |
518 | ||
519 | return 0; | |
1da177e4 | 520 | |
7fab479b DK |
521 | add_failed: |
522 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); | |
523 | bio_put(bio); | |
524 | dec_io(page, last_read_complete); | |
525 | return -EIO; | |
1da177e4 LT |
526 | } |
527 | ||
27496a8c | 528 | static int metapage_releasepage(struct page *page, gfp_t gfp_mask) |
7fab479b DK |
529 | { |
530 | struct metapage *mp; | |
b964638f | 531 | int ret = 1; |
967c9ec4 | 532 | int offset; |
7fab479b | 533 | |
09cbfeaf | 534 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
7fab479b DK |
535 | mp = page_to_mp(page, offset); |
536 | ||
537 | if (!mp) | |
538 | continue; | |
539 | ||
540 | jfs_info("metapage_releasepage: mp = 0x%p", mp); | |
b964638f DK |
541 | if (mp->count || mp->nohomeok || |
542 | test_bit(META_dirty, &mp->flag)) { | |
7fab479b DK |
543 | jfs_info("count = %ld, nohomeok = %d", mp->count, |
544 | mp->nohomeok); | |
b964638f | 545 | ret = 0; |
7fab479b DK |
546 | continue; |
547 | } | |
7fab479b DK |
548 | if (mp->lsn) |
549 | remove_from_logsync(mp); | |
550 | remove_metapage(page, mp); | |
551 | INCREMENT(mpStat.pagefree); | |
552 | free_metapage(mp); | |
553 | } | |
b964638f | 554 | return ret; |
7fab479b DK |
555 | } |
556 | ||
d47992f8 LC |
557 | static void metapage_invalidatepage(struct page *page, unsigned int offset, |
558 | unsigned int length) | |
7fab479b | 559 | { |
09cbfeaf | 560 | BUG_ON(offset || length < PAGE_SIZE); |
7fab479b | 561 | |
2ff28e22 | 562 | BUG_ON(PageWriteback(page)); |
7fab479b | 563 | |
2ff28e22 | 564 | metapage_releasepage(page, 0); |
7fab479b DK |
565 | } |
566 | ||
f5e54d6e | 567 | const struct address_space_operations jfs_metapage_aops = { |
7fab479b DK |
568 | .readpage = metapage_readpage, |
569 | .writepage = metapage_writepage, | |
7fab479b DK |
570 | .releasepage = metapage_releasepage, |
571 | .invalidatepage = metapage_invalidatepage, | |
572 | .set_page_dirty = __set_page_dirty_nobuffers, | |
573 | }; | |
574 | ||
1da177e4 LT |
575 | struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, |
576 | unsigned int size, int absolute, | |
577 | unsigned long new) | |
578 | { | |
1da177e4 LT |
579 | int l2BlocksPerPage; |
580 | int l2bsize; | |
581 | struct address_space *mapping; | |
7fab479b DK |
582 | struct metapage *mp = NULL; |
583 | struct page *page; | |
1da177e4 LT |
584 | unsigned long page_index; |
585 | unsigned long page_offset; | |
586 | ||
7fab479b DK |
587 | jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d", |
588 | inode->i_ino, lblock, absolute); | |
589 | ||
590 | l2bsize = inode->i_blkbits; | |
09cbfeaf | 591 | l2BlocksPerPage = PAGE_SHIFT - l2bsize; |
7fab479b DK |
592 | page_index = lblock >> l2BlocksPerPage; |
593 | page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; | |
09cbfeaf | 594 | if ((page_offset + size) > PAGE_SIZE) { |
7fab479b DK |
595 | jfs_err("MetaData crosses page boundary!!"); |
596 | jfs_err("lblock = %lx, size = %d", lblock, size); | |
597 | dump_stack(); | |
598 | return NULL; | |
599 | } | |
1da177e4 | 600 | if (absolute) |
7fab479b | 601 | mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping; |
1da177e4 LT |
602 | else { |
603 | /* | |
604 | * If an nfs client tries to read an inode that is larger | |
605 | * than any existing inodes, we may try to read past the | |
606 | * end of the inode map | |
607 | */ | |
608 | if ((lblock << inode->i_blkbits) >= inode->i_size) | |
609 | return NULL; | |
610 | mapping = inode->i_mapping; | |
611 | } | |
612 | ||
09cbfeaf | 613 | if (new && (PSIZE == PAGE_SIZE)) { |
7fab479b DK |
614 | page = grab_cache_page(mapping, page_index); |
615 | if (!page) { | |
616 | jfs_err("grab_cache_page failed!"); | |
617 | return NULL; | |
618 | } | |
619 | SetPageUptodate(page); | |
620 | } else { | |
090d2b18 | 621 | page = read_mapping_page(mapping, page_index, NULL); |
c40c2024 | 622 | if (IS_ERR(page) || !PageUptodate(page)) { |
090d2b18 | 623 | jfs_err("read_mapping_page failed!"); |
7fab479b DK |
624 | return NULL; |
625 | } | |
626 | lock_page(page); | |
627 | } | |
628 | ||
629 | mp = page_to_mp(page, page_offset); | |
1da177e4 | 630 | if (mp) { |
7fab479b DK |
631 | if (mp->logical_size != size) { |
632 | jfs_error(inode->i_sb, | |
eb8630d7 | 633 | "get_mp->logical_size != size\n"); |
7fab479b DK |
634 | jfs_err("logical_size = %d, size = %d", |
635 | mp->logical_size, size); | |
636 | dump_stack(); | |
63f83c9f | 637 | goto unlock; |
1da177e4 LT |
638 | } |
639 | mp->count++; | |
640 | lock_metapage(mp); | |
1da177e4 LT |
641 | if (test_bit(META_discard, &mp->flag)) { |
642 | if (!new) { | |
643 | jfs_error(inode->i_sb, | |
eb8630d7 | 644 | "using a discarded metapage\n"); |
7fab479b | 645 | discard_metapage(mp); |
63f83c9f | 646 | goto unlock; |
1da177e4 LT |
647 | } |
648 | clear_bit(META_discard, &mp->flag); | |
649 | } | |
1da177e4 | 650 | } else { |
7fab479b DK |
651 | INCREMENT(mpStat.pagealloc); |
652 | mp = alloc_metapage(GFP_NOFS); | |
88a96fa8 JH |
653 | if (!mp) |
654 | goto unlock; | |
7fab479b | 655 | mp->page = page; |
11ab8319 | 656 | mp->sb = inode->i_sb; |
1da177e4 | 657 | mp->flag = 0; |
1da177e4 LT |
658 | mp->xflag = COMMIT_PAGE; |
659 | mp->count = 1; | |
7fab479b | 660 | mp->nohomeok = 0; |
1da177e4 | 661 | mp->logical_size = size; |
7fab479b DK |
662 | mp->data = page_address(page) + page_offset; |
663 | mp->index = lblock; | |
664 | if (unlikely(insert_metapage(page, mp))) { | |
665 | free_metapage(mp); | |
666 | goto unlock; | |
1da177e4 | 667 | } |
7fab479b | 668 | lock_metapage(mp); |
1da177e4 LT |
669 | } |
670 | ||
7fab479b DK |
671 | if (new) { |
672 | jfs_info("zeroing mp = 0x%p", mp); | |
1da177e4 | 673 | memset(mp->data, 0, PSIZE); |
7fab479b | 674 | } |
1da177e4 | 675 | |
7fab479b DK |
676 | unlock_page(page); |
677 | jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data); | |
1da177e4 LT |
678 | return mp; |
679 | ||
7fab479b DK |
680 | unlock: |
681 | unlock_page(page); | |
1da177e4 LT |
682 | return NULL; |
683 | } | |
684 | ||
7fab479b | 685 | void grab_metapage(struct metapage * mp) |
1da177e4 | 686 | { |
7fab479b | 687 | jfs_info("grab_metapage: mp = 0x%p", mp); |
09cbfeaf | 688 | get_page(mp->page); |
7fab479b | 689 | lock_page(mp->page); |
1da177e4 | 690 | mp->count++; |
7fab479b DK |
691 | lock_metapage(mp); |
692 | unlock_page(mp->page); | |
1da177e4 LT |
693 | } |
694 | ||
7fab479b | 695 | void force_metapage(struct metapage *mp) |
1da177e4 | 696 | { |
7fab479b DK |
697 | struct page *page = mp->page; |
698 | jfs_info("force_metapage: mp = 0x%p", mp); | |
699 | set_bit(META_forcewrite, &mp->flag); | |
700 | clear_bit(META_sync, &mp->flag); | |
09cbfeaf | 701 | get_page(page); |
7fab479b DK |
702 | lock_page(page); |
703 | set_page_dirty(page); | |
11ab8319 DK |
704 | if (write_one_page(page)) |
705 | jfs_error(mp->sb, "write_one_page() failed\n"); | |
7fab479b | 706 | clear_bit(META_forcewrite, &mp->flag); |
09cbfeaf | 707 | put_page(page); |
7fab479b | 708 | } |
1da177e4 | 709 | |
1868f4aa | 710 | void hold_metapage(struct metapage *mp) |
7fab479b | 711 | { |
1da177e4 | 712 | lock_page(mp->page); |
7fab479b DK |
713 | } |
714 | ||
1868f4aa | 715 | void put_metapage(struct metapage *mp) |
7fab479b DK |
716 | { |
717 | if (mp->count || mp->nohomeok) { | |
718 | /* Someone else will release this */ | |
1da177e4 | 719 | unlock_page(mp->page); |
1da177e4 LT |
720 | return; |
721 | } | |
09cbfeaf | 722 | get_page(mp->page); |
7fab479b DK |
723 | mp->count++; |
724 | lock_metapage(mp); | |
1da177e4 | 725 | unlock_page(mp->page); |
7fab479b | 726 | release_metapage(mp); |
1da177e4 LT |
727 | } |
728 | ||
729 | void release_metapage(struct metapage * mp) | |
730 | { | |
7fab479b | 731 | struct page *page = mp->page; |
1da177e4 LT |
732 | jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag); |
733 | ||
7fab479b DK |
734 | BUG_ON(!page); |
735 | ||
736 | lock_page(page); | |
737 | unlock_metapage(mp); | |
1da177e4 LT |
738 | |
739 | assert(mp->count); | |
7fab479b DK |
740 | if (--mp->count || mp->nohomeok) { |
741 | unlock_page(page); | |
09cbfeaf | 742 | put_page(page); |
1da177e4 LT |
743 | return; |
744 | } | |
745 | ||
7fab479b DK |
746 | if (test_bit(META_dirty, &mp->flag)) { |
747 | set_page_dirty(page); | |
1da177e4 | 748 | if (test_bit(META_sync, &mp->flag)) { |
1da177e4 | 749 | clear_bit(META_sync, &mp->flag); |
11ab8319 DK |
750 | if (write_one_page(page)) |
751 | jfs_error(mp->sb, "write_one_page() failed\n"); | |
7fab479b | 752 | lock_page(page); /* write_one_page unlocks the page */ |
1da177e4 | 753 | } |
7fab479b DK |
754 | } else if (mp->lsn) /* discard_metapage doesn't remove it */ |
755 | remove_from_logsync(mp); | |
1da177e4 | 756 | |
7fab479b DK |
757 | /* Try to keep metapages from using up too much memory */ |
758 | drop_metapage(page, mp); | |
d0e671a9 | 759 | |
7fab479b | 760 | unlock_page(page); |
09cbfeaf | 761 | put_page(page); |
1da177e4 LT |
762 | } |
763 | ||
764 | void __invalidate_metapages(struct inode *ip, s64 addr, int len) | |
765 | { | |
7fab479b | 766 | sector_t lblock; |
09cbfeaf | 767 | int l2BlocksPerPage = PAGE_SHIFT - ip->i_blkbits; |
7fab479b | 768 | int BlocksPerPage = 1 << l2BlocksPerPage; |
1da177e4 | 769 | /* All callers are interested in block device's mapping */ |
7fab479b DK |
770 | struct address_space *mapping = |
771 | JFS_SBI(ip->i_sb)->direct_inode->i_mapping; | |
1da177e4 LT |
772 | struct metapage *mp; |
773 | struct page *page; | |
7fab479b | 774 | unsigned int offset; |
1da177e4 LT |
775 | |
776 | /* | |
7fab479b | 777 | * Mark metapages to discard. They will eventually be |
1da177e4 LT |
778 | * released, but should not be written. |
779 | */ | |
7fab479b DK |
780 | for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len; |
781 | lblock += BlocksPerPage) { | |
782 | page = find_lock_page(mapping, lblock >> l2BlocksPerPage); | |
783 | if (!page) | |
784 | continue; | |
09cbfeaf | 785 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
7fab479b DK |
786 | mp = page_to_mp(page, offset); |
787 | if (!mp) | |
788 | continue; | |
789 | if (mp->index < addr) | |
790 | continue; | |
791 | if (mp->index >= addr + len) | |
792 | break; | |
1da177e4 LT |
793 | |
794 | clear_bit(META_dirty, &mp->flag); | |
795 | set_bit(META_discard, &mp->flag); | |
7fab479b DK |
796 | if (mp->lsn) |
797 | remove_from_logsync(mp); | |
1da177e4 | 798 | } |
7fab479b | 799 | unlock_page(page); |
09cbfeaf | 800 | put_page(page); |
1da177e4 LT |
801 | } |
802 | } | |
803 | ||
804 | #ifdef CONFIG_JFS_STATISTICS | |
07a3b8ed | 805 | int jfs_mpstat_proc_show(struct seq_file *m, void *v) |
1da177e4 | 806 | { |
b2e03ca7 | 807 | seq_printf(m, |
1da177e4 LT |
808 | "JFS Metapage statistics\n" |
809 | "=======================\n" | |
810 | "page allocations = %d\n" | |
811 | "page frees = %d\n" | |
812 | "lock waits = %d\n", | |
813 | mpStat.pagealloc, | |
814 | mpStat.pagefree, | |
815 | mpStat.lockwait); | |
b2e03ca7 AD |
816 | return 0; |
817 | } | |
1da177e4 | 818 | #endif |