1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) International Business Machines Corp., 2000-2005 |
4 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
5 | */ |
6 | |
7 | #include <linux/fs.h> |
8 | #include <linux/mm.h> |
9 | #include <linux/module.h> |
10 | #include <linux/bio.h> |
11 | #include <linux/slab.h> |
12 | #include <linux/init.h> |
13 | #include <linux/buffer_head.h> |
14 | #include <linux/mempool.h> |
15 | #include <linux/seq_file.h> |
16 | #include <linux/writeback.h> |
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 | |
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 | |
32 | #define metapage_locked(mp) test_bit(META_locked, &(mp)->flag) |
33 | #define trylock_metapage(mp) test_and_set_bit_lock(META_locked, &(mp)->flag) |
34 | |
35 | static inline void unlock_metapage(struct metapage *mp) |
36 | { |
37 | clear_bit_unlock(META_locked, addr: &mp->flag); |
38 | wake_up(&mp->wait); |
39 | } |
40 | |
41 | static inline void __lock_metapage(struct metapage *mp) |
42 | { |
43 | DECLARE_WAITQUEUE(wait, current); |
44 | INCREMENT(mpStat.lockwait); |
45 | add_wait_queue_exclusive(wq_head: &mp->wait, wq_entry: &wait); |
46 | do { |
47 | set_current_state(TASK_UNINTERRUPTIBLE); |
48 | if (metapage_locked(mp)) { |
49 | unlock_page(page: mp->page); |
50 | io_schedule(); |
51 | lock_page(page: mp->page); |
52 | } |
53 | } while (trylock_metapage(mp)); |
54 | __set_current_state(TASK_RUNNING); |
55 | remove_wait_queue(wq_head: &mp->wait, wq_entry: &wait); |
56 | } |
57 | |
58 | /* |
59 | * Must have mp->page locked |
60 | */ |
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 |
68 | static struct kmem_cache *metapage_cache; |
69 | static mempool_t *metapage_mempool; |
70 | |
71 | #define MPS_PER_PAGE (PAGE_SIZE >> L2PSIZE) |
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 | }; |
80 | #define mp_anchor(page) ((struct meta_anchor *)page_private(page)) |
81 | |
82 | static inline struct metapage *page_to_mp(struct page *page, int offset) |
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 { |
98 | a = kzalloc(sizeof(struct meta_anchor), GFP_NOFS); |
99 | if (!a) |
100 | return -ENOMEM; |
101 | set_page_private(page, (unsigned long)a); |
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); |
129 | set_page_private(page, 0); |
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 |
147 | static inline struct metapage *page_to_mp(struct page *page, int offset) |
148 | { |
149 | return PagePrivate(page) ? (struct metapage *)page_private(page) : NULL; |
150 | } |
151 | |
152 | static inline int insert_metapage(struct page *page, struct metapage *mp) |
153 | { |
154 | if (mp) { |
155 | set_page_private(page, private: (unsigned long)mp); |
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 | { |
164 | set_page_private(page, private: 0); |
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 | |
174 | static inline struct metapage *alloc_metapage(gfp_t gfp_mask) |
175 | { |
176 | struct metapage *mp = mempool_alloc(pool: 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; |
187 | } |
188 | |
189 | static inline void free_metapage(struct metapage *mp) |
190 | { |
191 | mempool_free(element: mp, pool: metapage_mempool); |
192 | } |
193 | |
194 | int __init metapage_init(void) |
195 | { |
196 | /* |
197 | * Allocate the metapage structures |
198 | */ |
199 | metapage_cache = kmem_cache_create(name: "jfs_mp" , size: sizeof(struct metapage), |
200 | align: 0, flags: 0, NULL); |
201 | if (metapage_cache == NULL) |
202 | return -ENOMEM; |
203 | |
204 | metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES, |
205 | kc: metapage_cache); |
206 | |
207 | if (metapage_mempool == NULL) { |
208 | kmem_cache_destroy(s: metapage_cache); |
209 | return -ENOMEM; |
210 | } |
211 | |
212 | return 0; |
213 | } |
214 | |
215 | void metapage_exit(void) |
216 | { |
217 | mempool_destroy(pool: metapage_mempool); |
218 | kmem_cache_destroy(s: metapage_cache); |
219 | } |
220 | |
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 | |
231 | /* |
232 | * Metapage address space operations |
233 | */ |
234 | |
235 | static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock, |
236 | int *len) |
237 | { |
238 | int rc = 0; |
239 | int xflag; |
240 | s64 xaddr; |
241 | sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
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(ip: inode, lstart: (s64)lblock, llen: *len, pflag: &xflag, paddr: &xaddr, plen: len, flag: 0); |
251 | if ((rc == 0) && *len) |
252 | lblock = (sector_t)xaddr; |
253 | else |
254 | lblock = 0; |
255 | } /* else no mapping */ |
256 | |
257 | return lblock; |
258 | } |
259 | |
260 | static void last_read_complete(struct page *page) |
261 | { |
262 | if (!PageError(page)) |
263 | SetPageUptodate(page); |
264 | unlock_page(page); |
265 | } |
266 | |
267 | static void metapage_read_end_io(struct bio *bio) |
268 | { |
269 | struct page *page = bio->bi_private; |
270 | |
271 | if (bio->bi_status) { |
272 | printk(KERN_ERR "metapage_read_end_io: I/O error\n" ); |
273 | SetPageError(page); |
274 | } |
275 | |
276 | dec_io(page, last_read_complete); |
277 | bio_put(bio); |
278 | } |
279 | |
280 | static void remove_from_logsync(struct metapage *mp) |
281 | { |
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(entry: &mp->synclist); |
298 | } |
299 | LOGSYNC_UNLOCK(log, flags); |
300 | } |
301 | |
302 | static void last_write_complete(struct page *page) |
303 | { |
304 | struct metapage *mp; |
305 | unsigned int offset; |
306 | |
307 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
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, addr: &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); |
320 | } |
321 | |
322 | static void metapage_write_end_io(struct bio *bio) |
323 | { |
324 | struct page *page = bio->bi_private; |
325 | |
326 | BUG_ON(!PagePrivate(page)); |
327 | |
328 | if (bio->bi_status) { |
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); |
334 | } |
335 | |
336 | static int metapage_writepage(struct page *page, struct writeback_control *wbc) |
337 | { |
338 | struct bio *bio = NULL; |
339 | int block_offset; /* block offset of mp within page */ |
340 | struct inode *inode = page->mapping->host; |
341 | int blocks_per_mp = JFS_SBI(sb: inode->i_sb)->nbperpage; |
342 | int len; |
343 | int xlen; |
344 | struct metapage *mp; |
345 | int redirty = 0; |
346 | sector_t lblock; |
347 | int nr_underway = 0; |
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; |
353 | int offset; |
354 | int bad_blocks = 0; |
355 | |
356 | page_start = (sector_t)page->index << |
357 | (PAGE_SHIFT - inode->i_blkbits); |
358 | BUG_ON(!PageLocked(page)); |
359 | BUG_ON(PageWriteback(page)); |
360 | set_page_writeback(page); |
361 | |
362 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
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; |
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(log: mp->log, wait: 0); |
376 | continue; |
377 | } |
378 | |
379 | clear_bit(META_dirty, addr: &mp->flag); |
380 | set_bit(META_io, addr: &mp->flag); |
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; |
389 | continue; |
390 | } |
391 | /* Not contiguous */ |
392 | if (bio_add_page(bio, page, len: bio_bytes, off: 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); |
400 | if (!bio->bi_iter.bi_size) |
401 | goto dump_bio; |
402 | submit_bio(bio); |
403 | nr_underway++; |
404 | bio = NULL; |
405 | } else |
406 | inc_io(page); |
407 | xlen = (PAGE_SIZE - offset) >> inode->i_blkbits; |
408 | pblock = metapage_get_blocks(inode, lblock, len: &xlen); |
409 | if (!pblock) { |
410 | printk(KERN_ERR "JFS: metapage_get_blocks failed\n" ); |
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++; |
416 | continue; |
417 | } |
418 | len = min(xlen, (int)JFS_SBI(inode->i_sb)->nbperpage); |
419 | |
420 | bio = bio_alloc(bdev: inode->i_sb->s_bdev, nr_vecs: 1, opf: REQ_OP_WRITE, GFP_NOFS); |
421 | bio->bi_iter.bi_sector = pblock << (inode->i_blkbits - 9); |
422 | bio->bi_end_io = metapage_write_end_io; |
423 | bio->bi_private = page; |
424 | |
425 | /* Don't call bio_add_page yet, we may add to this vec */ |
426 | bio_offset = offset; |
427 | bio_bytes = len << inode->i_blkbits; |
428 | |
429 | xlen -= len; |
430 | next_block = lblock + len; |
431 | } |
432 | if (bio) { |
433 | if (bio_add_page(bio, page, len: bio_bytes, off: bio_offset) < bio_bytes) |
434 | goto add_failed; |
435 | if (!bio->bi_iter.bi_size) |
436 | goto dump_bio; |
437 | |
438 | submit_bio(bio); |
439 | nr_underway++; |
440 | } |
441 | if (redirty) |
442 | redirty_page_for_writepage(wbc, page); |
443 | |
444 | unlock_page(page); |
445 | |
446 | if (bad_blocks) |
447 | goto err_out; |
448 | |
449 | if (nr_underway == 0) |
450 | end_page_writeback(page); |
451 | |
452 | return 0; |
453 | add_failed: |
454 | /* We should never reach here, since we're only adding one vec */ |
455 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n" ); |
456 | goto skip; |
457 | dump_bio: |
458 | print_hex_dump(KERN_ERR, prefix_str: "JFS: dump of bio: " , prefix_type: DUMP_PREFIX_ADDRESS, rowsize: 16, |
459 | groupsize: 4, buf: bio, len: sizeof(*bio), ascii: 0); |
460 | skip: |
461 | bio_put(bio); |
462 | unlock_page(page); |
463 | dec_io(page, last_write_complete); |
464 | err_out: |
465 | while (bad_blocks--) |
466 | dec_io(page, last_write_complete); |
467 | return -EIO; |
468 | } |
469 | |
470 | static int metapage_read_folio(struct file *fp, struct folio *folio) |
471 | { |
472 | struct page *page = &folio->page; |
473 | struct inode *inode = page->mapping->host; |
474 | struct bio *bio = NULL; |
475 | int block_offset; |
476 | int blocks_per_page = i_blocks_per_page(inode, page); |
477 | sector_t page_start; /* address of page in fs blocks */ |
478 | sector_t pblock; |
479 | int xlen; |
480 | unsigned int len; |
481 | int offset; |
482 | |
483 | BUG_ON(!PageLocked(page)); |
484 | page_start = (sector_t)page->index << |
485 | (PAGE_SHIFT - inode->i_blkbits); |
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, lblock: page_start + block_offset, |
491 | len: &xlen); |
492 | if (pblock) { |
493 | if (!PagePrivate(page)) |
494 | insert_metapage(page, NULL); |
495 | inc_io(page); |
496 | if (bio) |
497 | submit_bio(bio); |
498 | |
499 | bio = bio_alloc(bdev: inode->i_sb->s_bdev, nr_vecs: 1, opf: REQ_OP_READ, |
500 | GFP_NOFS); |
501 | bio->bi_iter.bi_sector = |
502 | pblock << (inode->i_blkbits - 9); |
503 | bio->bi_end_io = metapage_read_end_io; |
504 | bio->bi_private = page; |
505 | len = xlen << inode->i_blkbits; |
506 | offset = block_offset << inode->i_blkbits; |
507 | if (bio_add_page(bio, page, len, off: offset) < len) |
508 | goto add_failed; |
509 | block_offset += xlen; |
510 | } else |
511 | block_offset++; |
512 | } |
513 | if (bio) |
514 | submit_bio(bio); |
515 | else |
516 | unlock_page(page); |
517 | |
518 | return 0; |
519 | |
520 | add_failed: |
521 | printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n" ); |
522 | bio_put(bio); |
523 | dec_io(page, last_read_complete); |
524 | return -EIO; |
525 | } |
526 | |
527 | static bool metapage_release_folio(struct folio *folio, gfp_t gfp_mask) |
528 | { |
529 | struct metapage *mp; |
530 | bool ret = true; |
531 | int offset; |
532 | |
533 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
534 | mp = page_to_mp(page: &folio->page, offset); |
535 | |
536 | if (!mp) |
537 | continue; |
538 | |
539 | jfs_info("metapage_release_folio: mp = 0x%p" , mp); |
540 | if (mp->count || mp->nohomeok || |
541 | test_bit(META_dirty, &mp->flag)) { |
542 | jfs_info("count = %ld, nohomeok = %d" , mp->count, |
543 | mp->nohomeok); |
544 | ret = false; |
545 | continue; |
546 | } |
547 | if (mp->lsn) |
548 | remove_from_logsync(mp); |
549 | remove_metapage(page: &folio->page, mp); |
550 | INCREMENT(mpStat.pagefree); |
551 | free_metapage(mp); |
552 | } |
553 | return ret; |
554 | } |
555 | |
556 | static void metapage_invalidate_folio(struct folio *folio, size_t offset, |
557 | size_t length) |
558 | { |
559 | BUG_ON(offset || length < folio_size(folio)); |
560 | |
561 | BUG_ON(folio_test_writeback(folio)); |
562 | |
563 | metapage_release_folio(folio, gfp_mask: 0); |
564 | } |
565 | |
566 | const struct address_space_operations jfs_metapage_aops = { |
567 | .read_folio = metapage_read_folio, |
568 | .writepage = metapage_writepage, |
569 | .release_folio = metapage_release_folio, |
570 | .invalidate_folio = metapage_invalidate_folio, |
571 | .dirty_folio = filemap_dirty_folio, |
572 | }; |
573 | |
574 | struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, |
575 | unsigned int size, int absolute, |
576 | unsigned long new) |
577 | { |
578 | int l2BlocksPerPage; |
579 | int l2bsize; |
580 | struct address_space *mapping; |
581 | struct metapage *mp = NULL; |
582 | struct page *page; |
583 | unsigned long page_index; |
584 | unsigned long page_offset; |
585 | |
586 | jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d" , |
587 | inode->i_ino, lblock, absolute); |
588 | |
589 | l2bsize = inode->i_blkbits; |
590 | l2BlocksPerPage = PAGE_SHIFT - l2bsize; |
591 | page_index = lblock >> l2BlocksPerPage; |
592 | page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; |
593 | if ((page_offset + size) > PAGE_SIZE) { |
594 | jfs_err("MetaData crosses page boundary!!" ); |
595 | jfs_err("lblock = %lx, size = %d" , lblock, size); |
596 | dump_stack(); |
597 | return NULL; |
598 | } |
599 | if (absolute) |
600 | mapping = JFS_SBI(sb: inode->i_sb)->direct_inode->i_mapping; |
601 | else { |
602 | /* |
603 | * If an nfs client tries to read an inode that is larger |
604 | * than any existing inodes, we may try to read past the |
605 | * end of the inode map |
606 | */ |
607 | if ((lblock << inode->i_blkbits) >= inode->i_size) |
608 | return NULL; |
609 | mapping = inode->i_mapping; |
610 | } |
611 | |
612 | if (new && (PSIZE == PAGE_SIZE)) { |
613 | page = grab_cache_page(mapping, index: page_index); |
614 | if (!page) { |
615 | jfs_err("grab_cache_page failed!" ); |
616 | return NULL; |
617 | } |
618 | SetPageUptodate(page); |
619 | } else { |
620 | page = read_mapping_page(mapping, index: page_index, NULL); |
621 | if (IS_ERR(ptr: page)) { |
622 | jfs_err("read_mapping_page failed!" ); |
623 | return NULL; |
624 | } |
625 | lock_page(page); |
626 | } |
627 | |
628 | mp = page_to_mp(page, offset: page_offset); |
629 | if (mp) { |
630 | if (mp->logical_size != size) { |
631 | jfs_error(inode->i_sb, |
632 | "get_mp->logical_size != size\n" ); |
633 | jfs_err("logical_size = %d, size = %d" , |
634 | mp->logical_size, size); |
635 | dump_stack(); |
636 | goto unlock; |
637 | } |
638 | mp->count++; |
639 | lock_metapage(mp); |
640 | if (test_bit(META_discard, &mp->flag)) { |
641 | if (!new) { |
642 | jfs_error(inode->i_sb, |
643 | "using a discarded metapage\n" ); |
644 | discard_metapage(mp); |
645 | goto unlock; |
646 | } |
647 | clear_bit(META_discard, addr: &mp->flag); |
648 | } |
649 | } else { |
650 | INCREMENT(mpStat.pagealloc); |
651 | mp = alloc_metapage(GFP_NOFS); |
652 | if (!mp) |
653 | goto unlock; |
654 | mp->page = page; |
655 | mp->sb = inode->i_sb; |
656 | mp->flag = 0; |
657 | mp->xflag = COMMIT_PAGE; |
658 | mp->count = 1; |
659 | mp->nohomeok = 0; |
660 | mp->logical_size = size; |
661 | mp->data = page_address(page) + page_offset; |
662 | mp->index = lblock; |
663 | if (unlikely(insert_metapage(page, mp))) { |
664 | free_metapage(mp); |
665 | goto unlock; |
666 | } |
667 | lock_metapage(mp); |
668 | } |
669 | |
670 | if (new) { |
671 | jfs_info("zeroing mp = 0x%p" , mp); |
672 | memset(mp->data, 0, PSIZE); |
673 | } |
674 | |
675 | unlock_page(page); |
676 | jfs_info("__get_metapage: returning = 0x%p data = 0x%p" , mp, mp->data); |
677 | return mp; |
678 | |
679 | unlock: |
680 | unlock_page(page); |
681 | return NULL; |
682 | } |
683 | |
684 | void grab_metapage(struct metapage * mp) |
685 | { |
686 | jfs_info("grab_metapage: mp = 0x%p" , mp); |
687 | get_page(page: mp->page); |
688 | lock_page(page: mp->page); |
689 | mp->count++; |
690 | lock_metapage(mp); |
691 | unlock_page(page: mp->page); |
692 | } |
693 | |
694 | static int metapage_write_one(struct page *page) |
695 | { |
696 | struct folio *folio = page_folio(page); |
697 | struct address_space *mapping = folio->mapping; |
698 | struct writeback_control wbc = { |
699 | .sync_mode = WB_SYNC_ALL, |
700 | .nr_to_write = folio_nr_pages(folio), |
701 | }; |
702 | int ret = 0; |
703 | |
704 | BUG_ON(!folio_test_locked(folio)); |
705 | |
706 | folio_wait_writeback(folio); |
707 | |
708 | if (folio_clear_dirty_for_io(folio)) { |
709 | folio_get(folio); |
710 | ret = metapage_writepage(page, wbc: &wbc); |
711 | if (ret == 0) |
712 | folio_wait_writeback(folio); |
713 | folio_put(folio); |
714 | } else { |
715 | folio_unlock(folio); |
716 | } |
717 | |
718 | if (!ret) |
719 | ret = filemap_check_errors(mapping); |
720 | return ret; |
721 | } |
722 | |
723 | void force_metapage(struct metapage *mp) |
724 | { |
725 | struct page *page = mp->page; |
726 | jfs_info("force_metapage: mp = 0x%p" , mp); |
727 | set_bit(META_forcewrite, addr: &mp->flag); |
728 | clear_bit(META_sync, addr: &mp->flag); |
729 | get_page(page); |
730 | lock_page(page); |
731 | set_page_dirty(page); |
732 | if (metapage_write_one(page)) |
733 | jfs_error(mp->sb, "metapage_write_one() failed\n" ); |
734 | clear_bit(META_forcewrite, addr: &mp->flag); |
735 | put_page(page); |
736 | } |
737 | |
738 | void hold_metapage(struct metapage *mp) |
739 | { |
740 | lock_page(page: mp->page); |
741 | } |
742 | |
743 | void put_metapage(struct metapage *mp) |
744 | { |
745 | if (mp->count || mp->nohomeok) { |
746 | /* Someone else will release this */ |
747 | unlock_page(page: mp->page); |
748 | return; |
749 | } |
750 | get_page(page: mp->page); |
751 | mp->count++; |
752 | lock_metapage(mp); |
753 | unlock_page(page: mp->page); |
754 | release_metapage(mp); |
755 | } |
756 | |
757 | void release_metapage(struct metapage * mp) |
758 | { |
759 | struct page *page = mp->page; |
760 | jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx" , mp, mp->flag); |
761 | |
762 | BUG_ON(!page); |
763 | |
764 | lock_page(page); |
765 | unlock_metapage(mp); |
766 | |
767 | assert(mp->count); |
768 | if (--mp->count || mp->nohomeok) { |
769 | unlock_page(page); |
770 | put_page(page); |
771 | return; |
772 | } |
773 | |
774 | if (test_bit(META_dirty, &mp->flag)) { |
775 | set_page_dirty(page); |
776 | if (test_bit(META_sync, &mp->flag)) { |
777 | clear_bit(META_sync, addr: &mp->flag); |
778 | if (metapage_write_one(page)) |
779 | jfs_error(mp->sb, "metapage_write_one() failed\n" ); |
780 | lock_page(page); |
781 | } |
782 | } else if (mp->lsn) /* discard_metapage doesn't remove it */ |
783 | remove_from_logsync(mp); |
784 | |
785 | /* Try to keep metapages from using up too much memory */ |
786 | drop_metapage(page, mp); |
787 | |
788 | unlock_page(page); |
789 | put_page(page); |
790 | } |
791 | |
792 | void __invalidate_metapages(struct inode *ip, s64 addr, int len) |
793 | { |
794 | sector_t lblock; |
795 | int l2BlocksPerPage = PAGE_SHIFT - ip->i_blkbits; |
796 | int BlocksPerPage = 1 << l2BlocksPerPage; |
797 | /* All callers are interested in block device's mapping */ |
798 | struct address_space *mapping = |
799 | JFS_SBI(sb: ip->i_sb)->direct_inode->i_mapping; |
800 | struct metapage *mp; |
801 | struct page *page; |
802 | unsigned int offset; |
803 | |
804 | /* |
805 | * Mark metapages to discard. They will eventually be |
806 | * released, but should not be written. |
807 | */ |
808 | for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len; |
809 | lblock += BlocksPerPage) { |
810 | page = find_lock_page(mapping, index: lblock >> l2BlocksPerPage); |
811 | if (!page) |
812 | continue; |
813 | for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) { |
814 | mp = page_to_mp(page, offset); |
815 | if (!mp) |
816 | continue; |
817 | if (mp->index < addr) |
818 | continue; |
819 | if (mp->index >= addr + len) |
820 | break; |
821 | |
822 | clear_bit(META_dirty, addr: &mp->flag); |
823 | set_bit(META_discard, addr: &mp->flag); |
824 | if (mp->lsn) |
825 | remove_from_logsync(mp); |
826 | } |
827 | unlock_page(page); |
828 | put_page(page); |
829 | } |
830 | } |
831 | |
832 | #ifdef CONFIG_JFS_STATISTICS |
833 | int jfs_mpstat_proc_show(struct seq_file *m, void *v) |
834 | { |
835 | seq_printf(m, |
836 | fmt: "JFS Metapage statistics\n" |
837 | "=======================\n" |
838 | "page allocations = %d\n" |
839 | "page frees = %d\n" |
840 | "lock waits = %d\n" , |
841 | mpStat.pagealloc, |
842 | mpStat.pagefree, |
843 | mpStat.lockwait); |
844 | return 0; |
845 | } |
846 | #endif |
847 | |