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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Dave Kleikamp7fab4792005-05-02 12:25:02 -06002 * Copyright (C) International Business Machines Corp., 2000-2005
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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
Dave Kleikamp63f83c92006-10-02 09:55:27 -05007 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Dave Kleikamp63f83c92006-10-02 09:55:27 -050016 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/fs.h>
Dave Kleikamp7fab4792005-05-02 12:25:02 -060021#include <linux/mm.h>
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -050022#include <linux/module.h>
Dave Kleikamp7fab4792005-05-02 12:25:02 -060023#include <linux/bio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/init.h>
26#include <linux/buffer_head.h>
27#include <linux/mempool.h>
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -050028#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "jfs_incore.h"
30#include "jfs_superblock.h"
31#include "jfs_filsys.h"
32#include "jfs_metapage.h"
33#include "jfs_txnmgr.h"
34#include "jfs_debug.h"
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#ifdef CONFIG_JFS_STATISTICS
37static struct {
38 uint pagealloc; /* # of page allocations */
39 uint pagefree; /* # of page frees */
40 uint lockwait; /* # of sleeping lock_metapage() calls */
41} mpStat;
42#endif
43
Dave Kleikamp7fab4792005-05-02 12:25:02 -060044#define metapage_locked(mp) test_bit(META_locked, &(mp)->flag)
Nick Piggin54af6232007-11-26 14:58:10 -060045#define trylock_metapage(mp) test_and_set_bit_lock(META_locked, &(mp)->flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47static inline void unlock_metapage(struct metapage *mp)
48{
Nick Piggin54af6232007-11-26 14:58:10 -060049 clear_bit_unlock(META_locked, &mp->flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 wake_up(&mp->wait);
51}
52
Dave Kleikamp7fab4792005-05-02 12:25:02 -060053static inline void __lock_metapage(struct metapage *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
55 DECLARE_WAITQUEUE(wait, current);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 INCREMENT(mpStat.lockwait);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 add_wait_queue_exclusive(&mp->wait, &wait);
58 do {
59 set_current_state(TASK_UNINTERRUPTIBLE);
60 if (metapage_locked(mp)) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -060061 unlock_page(mp->page);
Dave Kleikamp4aa0d232007-01-17 21:18:35 -060062 io_schedule();
Dave Kleikamp7fab4792005-05-02 12:25:02 -060063 lock_page(mp->page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 }
65 } while (trylock_metapage(mp));
66 __set_current_state(TASK_RUNNING);
67 remove_wait_queue(&mp->wait, &wait);
68}
69
Dave Kleikamp7fab4792005-05-02 12:25:02 -060070/*
71 * Must have mp->page locked
72 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070073static inline void lock_metapage(struct metapage *mp)
74{
75 if (trylock_metapage(mp))
76 __lock_metapage(mp);
77}
78
79#define METAPOOL_MIN_PAGES 32
Christoph Lametere18b8902006-12-06 20:33:20 -080080static struct kmem_cache *metapage_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081static mempool_t *metapage_mempool;
82
Dave Kleikamp7fab4792005-05-02 12:25:02 -060083#define MPS_PER_PAGE (PAGE_CACHE_SIZE >> L2PSIZE)
84
85#if MPS_PER_PAGE > 1
86
87struct meta_anchor {
88 int mp_count;
89 atomic_t io_count;
90 struct metapage *mp[MPS_PER_PAGE];
91};
Hugh Dickins4c21e2f2005-10-29 18:16:40 -070092#define mp_anchor(page) ((struct meta_anchor *)page_private(page))
Dave Kleikamp7fab4792005-05-02 12:25:02 -060093
Dave Kleikamp967c9ec2008-01-10 16:04:25 -060094static inline struct metapage *page_to_mp(struct page *page, int offset)
Dave Kleikamp7fab4792005-05-02 12:25:02 -060095{
96 if (!PagePrivate(page))
97 return NULL;
98 return mp_anchor(page)->mp[offset >> L2PSIZE];
99}
100
101static inline int insert_metapage(struct page *page, struct metapage *mp)
102{
103 struct meta_anchor *a;
104 int index;
105 int l2mp_blocks; /* log2 blocks per metapage */
106
107 if (PagePrivate(page))
108 a = mp_anchor(page);
109 else {
Eric Sesterhenn5b3030e2006-02-23 09:47:13 -0600110 a = kzalloc(sizeof(struct meta_anchor), GFP_NOFS);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600111 if (!a)
112 return -ENOMEM;
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700113 set_page_private(page, (unsigned long)a);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600114 SetPagePrivate(page);
115 kmap(page);
116 }
117
118 if (mp) {
119 l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits;
120 index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1);
121 a->mp_count++;
122 a->mp[index] = mp;
123 }
124
125 return 0;
126}
127
128static inline void remove_metapage(struct page *page, struct metapage *mp)
129{
130 struct meta_anchor *a = mp_anchor(page);
131 int l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits;
132 int index;
133
134 index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1);
135
136 BUG_ON(a->mp[index] != mp);
137
138 a->mp[index] = NULL;
139 if (--a->mp_count == 0) {
140 kfree(a);
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700141 set_page_private(page, 0);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600142 ClearPagePrivate(page);
143 kunmap(page);
144 }
145}
146
147static inline void inc_io(struct page *page)
148{
149 atomic_inc(&mp_anchor(page)->io_count);
150}
151
152static inline void dec_io(struct page *page, void (*handler) (struct page *))
153{
154 if (atomic_dec_and_test(&mp_anchor(page)->io_count))
155 handler(page);
156}
157
158#else
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600159static inline struct metapage *page_to_mp(struct page *page, int offset)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600160{
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700161 return PagePrivate(page) ? (struct metapage *)page_private(page) : NULL;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600162}
163
164static inline int insert_metapage(struct page *page, struct metapage *mp)
165{
166 if (mp) {
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700167 set_page_private(page, (unsigned long)mp);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600168 SetPagePrivate(page);
169 kmap(page);
170 }
171 return 0;
172}
173
174static inline void remove_metapage(struct page *page, struct metapage *mp)
175{
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700176 set_page_private(page, 0);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600177 ClearPagePrivate(page);
178 kunmap(page);
179}
180
181#define inc_io(page) do {} while(0)
182#define dec_io(page, handler) handler(page)
183
184#endif
185
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700186static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
188 struct metapage *mp = (struct metapage *)foo;
189
Christoph Lametera35afb82007-05-16 22:10:57 -0700190 mp->lid = 0;
191 mp->lsn = 0;
192 mp->flag = 0;
193 mp->data = NULL;
194 mp->clsn = 0;
195 mp->log = NULL;
196 set_bit(META_free, &mp->flag);
197 init_waitqueue_head(&mp->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
Al Viro27496a82005-10-21 03:20:48 -0400200static inline struct metapage *alloc_metapage(gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
202 return mempool_alloc(metapage_mempool, gfp_mask);
203}
204
205static 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
213int __init metapage_init(void)
214{
215 /*
216 * Allocate the metapage structures
217 */
218 metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage),
Paul Mundt20c2df82007-07-20 10:11:58 +0900219 0, 0, init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 if (metapage_cache == NULL)
221 return -ENOMEM;
222
Matthew Dobson93d23412006-03-26 01:37:50 -0800223 metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES,
224 metapage_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 if (metapage_mempool == NULL) {
227 kmem_cache_destroy(metapage_cache);
228 return -ENOMEM;
229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 return 0;
232}
233
234void metapage_exit(void)
235{
236 mempool_destroy(metapage_mempool);
237 kmem_cache_destroy(metapage_cache);
238}
239
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600240static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250/*
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600251 * Metapage address space operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600253
254static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock,
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600255 int *len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600257 int rc = 0;
258 int xflag;
259 s64 xaddr;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700260 sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600261 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277}
278
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600279static void last_read_complete(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600281 if (!PageError(page))
282 SetPageUptodate(page);
283 unlock_page(page);
284}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
NeilBrown6712ecf2007-09-27 12:47:43 +0200286static void metapage_read_end_io(struct bio *bio, int err)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600287{
288 struct page *page = bio->bi_private;
289
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600290 if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
291 printk(KERN_ERR "metapage_read_end_io: I/O error\n");
292 SetPageError(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 }
294
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600295 dec_io(page, last_read_complete);
296 bio_put(bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600299static void remove_from_logsync(struct metapage *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600301 struct jfs_log *log = mp->log;
302 unsigned long flags;
303/*
304 * This can race. Recheck that log hasn't been set to null, and after
305 * acquiring logsync lock, recheck lsn
306 */
307 if (!log)
308 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600310 LOGSYNC_LOCK(log, flags);
311 if (mp->lsn) {
312 mp->log = NULL;
313 mp->lsn = 0;
314 mp->clsn = 0;
315 log->count--;
316 list_del(&mp->synclist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600318 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
320
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600321static void last_write_complete(struct page *page)
322{
323 struct metapage *mp;
324 unsigned int offset;
325
326 for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
327 mp = page_to_mp(page, offset);
328 if (mp && test_bit(META_io, &mp->flag)) {
329 if (mp->lsn)
330 remove_from_logsync(mp);
331 clear_bit(META_io, &mp->flag);
332 }
333 /*
334 * I'd like to call drop_metapage here, but I don't think it's
335 * safe unless I have the page locked
336 */
337 }
338 end_page_writeback(page);
339}
340
NeilBrown6712ecf2007-09-27 12:47:43 +0200341static void metapage_write_end_io(struct bio *bio, int err)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600342{
343 struct page *page = bio->bi_private;
344
345 BUG_ON(!PagePrivate(page));
346
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600347 if (! test_bit(BIO_UPTODATE, &bio->bi_flags)) {
348 printk(KERN_ERR "metapage_write_end_io: I/O error\n");
349 SetPageError(page);
350 }
351 dec_io(page, last_write_complete);
352 bio_put(bio);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600353}
354
355static int metapage_writepage(struct page *page, struct writeback_control *wbc)
356{
357 struct bio *bio = NULL;
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600358 int block_offset; /* block offset of mp within page */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600359 struct inode *inode = page->mapping->host;
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600360 int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage;
361 int len;
362 int xlen;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600363 struct metapage *mp;
364 int redirty = 0;
365 sector_t lblock;
Dave Kleikamp29a424f2008-01-03 13:09:33 -0600366 int nr_underway = 0;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600367 sector_t pblock;
368 sector_t next_block = 0;
369 sector_t page_start;
370 unsigned long bio_bytes = 0;
371 unsigned long bio_offset = 0;
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600372 int offset;
Dave Kleikamp1ad53a92009-01-30 14:09:06 -0600373 int bad_blocks = 0;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600374
375 page_start = (sector_t)page->index <<
376 (PAGE_CACHE_SHIFT - inode->i_blkbits);
377 BUG_ON(!PageLocked(page));
378 BUG_ON(PageWriteback(page));
Dave Kleikamp29a424f2008-01-03 13:09:33 -0600379 set_page_writeback(page);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600380
381 for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
382 mp = page_to_mp(page, offset);
383
384 if (!mp || !test_bit(META_dirty, &mp->flag))
385 continue;
386
387 if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) {
388 redirty = 1;
Dave Kleikampac17b8b2005-10-03 15:32:11 -0500389 /*
390 * Make sure this page isn't blocked indefinitely.
391 * If the journal isn't undergoing I/O, push it
392 */
393 if (mp->log && !(mp->log->cflag & logGC_PAGEOUT))
394 jfs_flush_journal(mp->log, 0);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600395 continue;
396 }
397
398 clear_bit(META_dirty, &mp->flag);
Dave Kleikamp1ad53a92009-01-30 14:09:06 -0600399 set_bit(META_io, &mp->flag);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600400 block_offset = offset >> inode->i_blkbits;
401 lblock = page_start + block_offset;
402 if (bio) {
403 if (xlen && lblock == next_block) {
404 /* Contiguous, in memory & on disk */
405 len = min(xlen, blocks_per_mp);
406 xlen -= len;
407 bio_bytes += len << inode->i_blkbits;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600408 continue;
409 }
410 /* Not contiguous */
411 if (bio_add_page(bio, page, bio_bytes, bio_offset) <
412 bio_bytes)
413 goto add_failed;
414 /*
415 * Increment counter before submitting i/o to keep
416 * count from hitting zero before we're through
417 */
418 inc_io(page);
419 if (!bio->bi_size)
420 goto dump_bio;
421 submit_bio(WRITE, bio);
Dave Kleikamp29a424f2008-01-03 13:09:33 -0600422 nr_underway++;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600423 bio = NULL;
Dave Kleikamp29a424f2008-01-03 13:09:33 -0600424 } else
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600425 inc_io(page);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600426 xlen = (PAGE_CACHE_SIZE - offset) >> inode->i_blkbits;
427 pblock = metapage_get_blocks(inode, lblock, &xlen);
428 if (!pblock) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600429 printk(KERN_ERR "JFS: metapage_get_blocks failed\n");
Dave Kleikamp1ad53a92009-01-30 14:09:06 -0600430 /*
431 * We already called inc_io(), but can't cancel it
432 * with dec_io() until we're done with the page
433 */
434 bad_blocks++;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600435 continue;
436 }
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600437 len = min(xlen, (int)JFS_SBI(inode->i_sb)->nbperpage);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600438
439 bio = bio_alloc(GFP_NOFS, 1);
440 bio->bi_bdev = inode->i_sb->s_bdev;
441 bio->bi_sector = pblock << (inode->i_blkbits - 9);
442 bio->bi_end_io = metapage_write_end_io;
443 bio->bi_private = page;
444
445 /* Don't call bio_add_page yet, we may add to this vec */
446 bio_offset = offset;
447 bio_bytes = len << inode->i_blkbits;
448
449 xlen -= len;
450 next_block = lblock + len;
451 }
452 if (bio) {
453 if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes)
454 goto add_failed;
455 if (!bio->bi_size)
456 goto dump_bio;
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500457
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600458 submit_bio(WRITE, bio);
Dave Kleikamp29a424f2008-01-03 13:09:33 -0600459 nr_underway++;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600460 }
461 if (redirty)
462 redirty_page_for_writepage(wbc, page);
463
464 unlock_page(page);
465
Dave Kleikamp1ad53a92009-01-30 14:09:06 -0600466 if (bad_blocks)
467 goto err_out;
468
Dave Kleikamp29a424f2008-01-03 13:09:33 -0600469 if (nr_underway == 0)
470 end_page_writeback(page);
471
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600472 return 0;
473add_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;
477dump_bio:
Dave Kleikamp288e4d82007-06-13 10:17:50 -0500478 print_hex_dump(KERN_ERR, "JFS: dump of bio: ", DUMP_PREFIX_ADDRESS, 16,
479 4, bio, sizeof(*bio), 0);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600480skip:
481 bio_put(bio);
482 unlock_page(page);
483 dec_io(page, last_write_complete);
Dave Kleikamp1ad53a92009-01-30 14:09:06 -0600484err_out:
485 while (bad_blocks--)
486 dec_io(page, last_write_complete);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600487 return -EIO;
488}
489
490static int metapage_readpage(struct file *fp, struct page *page)
491{
492 struct inode *inode = page->mapping->host;
493 struct bio *bio = NULL;
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600494 int block_offset;
495 int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600496 sector_t page_start; /* address of page in fs blocks */
497 sector_t pblock;
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600498 int xlen;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600499 unsigned int len;
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600500 int offset;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600501
502 BUG_ON(!PageLocked(page));
503 page_start = (sector_t)page->index <<
504 (PAGE_CACHE_SHIFT - inode->i_blkbits);
505
506 block_offset = 0;
507 while (block_offset < blocks_per_page) {
508 xlen = blocks_per_page - block_offset;
509 pblock = metapage_get_blocks(inode, page_start + block_offset,
510 &xlen);
511 if (pblock) {
512 if (!PagePrivate(page))
513 insert_metapage(page, NULL);
514 inc_io(page);
515 if (bio)
516 submit_bio(READ, bio);
517
518 bio = bio_alloc(GFP_NOFS, 1);
519 bio->bi_bdev = inode->i_sb->s_bdev;
520 bio->bi_sector = pblock << (inode->i_blkbits - 9);
521 bio->bi_end_io = metapage_read_end_io;
522 bio->bi_private = page;
523 len = xlen << inode->i_blkbits;
524 offset = block_offset << inode->i_blkbits;
525 if (bio_add_page(bio, page, len, offset) < len)
526 goto add_failed;
527 block_offset += xlen;
528 } else
529 block_offset++;
530 }
531 if (bio)
532 submit_bio(READ, bio);
533 else
534 unlock_page(page);
535
536 return 0;
537
538add_failed:
539 printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n");
540 bio_put(bio);
541 dec_io(page, last_read_complete);
542 return -EIO;
543}
544
Al Viro27496a82005-10-21 03:20:48 -0400545static int metapage_releasepage(struct page *page, gfp_t gfp_mask)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600546{
547 struct metapage *mp;
Dave Kleikampb9646382006-05-24 07:43:38 -0500548 int ret = 1;
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600549 int offset;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600550
551 for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
552 mp = page_to_mp(page, offset);
553
554 if (!mp)
555 continue;
556
557 jfs_info("metapage_releasepage: mp = 0x%p", mp);
Dave Kleikampb9646382006-05-24 07:43:38 -0500558 if (mp->count || mp->nohomeok ||
559 test_bit(META_dirty, &mp->flag)) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600560 jfs_info("count = %ld, nohomeok = %d", mp->count,
561 mp->nohomeok);
Dave Kleikampb9646382006-05-24 07:43:38 -0500562 ret = 0;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600563 continue;
564 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600565 if (mp->lsn)
566 remove_from_logsync(mp);
567 remove_metapage(page, mp);
568 INCREMENT(mpStat.pagefree);
569 free_metapage(mp);
570 }
Dave Kleikampb9646382006-05-24 07:43:38 -0500571 return ret;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600572}
573
NeilBrown2ff28e22006-03-26 01:37:18 -0800574static void metapage_invalidatepage(struct page *page, unsigned long offset)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600575{
576 BUG_ON(offset);
577
NeilBrown2ff28e22006-03-26 01:37:18 -0800578 BUG_ON(PageWriteback(page));
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600579
NeilBrown2ff28e22006-03-26 01:37:18 -0800580 metapage_releasepage(page, 0);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600581}
582
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700583const struct address_space_operations jfs_metapage_aops = {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600584 .readpage = metapage_readpage,
585 .writepage = metapage_writepage,
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600586 .releasepage = metapage_releasepage,
587 .invalidatepage = metapage_invalidatepage,
588 .set_page_dirty = __set_page_dirty_nobuffers,
589};
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591struct metapage *__get_metapage(struct inode *inode, unsigned long lblock,
592 unsigned int size, int absolute,
593 unsigned long new)
594{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 int l2BlocksPerPage;
596 int l2bsize;
597 struct address_space *mapping;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600598 struct metapage *mp = NULL;
599 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 unsigned long page_index;
601 unsigned long page_offset;
602
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600603 jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d",
604 inode->i_ino, lblock, absolute);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600606 l2bsize = inode->i_blkbits;
607 l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize;
608 page_index = lblock >> l2BlocksPerPage;
609 page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize;
610 if ((page_offset + size) > PAGE_CACHE_SIZE) {
611 jfs_err("MetaData crosses page boundary!!");
612 jfs_err("lblock = %lx, size = %d", lblock, size);
613 dump_stack();
614 return NULL;
615 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 if (absolute)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600617 mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 else {
619 /*
620 * If an nfs client tries to read an inode that is larger
621 * than any existing inodes, we may try to read past the
622 * end of the inode map
623 */
624 if ((lblock << inode->i_blkbits) >= inode->i_size)
625 return NULL;
626 mapping = inode->i_mapping;
627 }
628
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600629 if (new && (PSIZE == PAGE_CACHE_SIZE)) {
630 page = grab_cache_page(mapping, page_index);
631 if (!page) {
632 jfs_err("grab_cache_page failed!");
633 return NULL;
634 }
635 SetPageUptodate(page);
636 } else {
Pekka Enberg090d2b12006-06-23 02:05:08 -0700637 page = read_mapping_page(mapping, page_index, NULL);
Dave Kleikampc40c2022005-07-22 11:08:44 -0500638 if (IS_ERR(page) || !PageUptodate(page)) {
Pekka Enberg090d2b12006-06-23 02:05:08 -0700639 jfs_err("read_mapping_page failed!");
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600640 return NULL;
641 }
642 lock_page(page);
643 }
644
645 mp = page_to_mp(page, page_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 if (mp) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600647 if (mp->logical_size != size) {
648 jfs_error(inode->i_sb,
649 "__get_metapage: mp->logical_size != size");
650 jfs_err("logical_size = %d, size = %d",
651 mp->logical_size, size);
652 dump_stack();
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500653 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 }
655 mp->count++;
656 lock_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (test_bit(META_discard, &mp->flag)) {
658 if (!new) {
659 jfs_error(inode->i_sb,
660 "__get_metapage: using a "
661 "discarded metapage");
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600662 discard_metapage(mp);
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500663 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 }
665 clear_bit(META_discard, &mp->flag);
666 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 } else {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600668 INCREMENT(mpStat.pagealloc);
669 mp = alloc_metapage(GFP_NOFS);
670 mp->page = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 mp->flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 mp->xflag = COMMIT_PAGE;
673 mp->count = 1;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600674 mp->nohomeok = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 mp->logical_size = size;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600676 mp->data = page_address(page) + page_offset;
677 mp->index = lblock;
678 if (unlikely(insert_metapage(page, mp))) {
679 free_metapage(mp);
680 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600682 lock_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 }
684
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600685 if (new) {
686 jfs_info("zeroing mp = 0x%p", mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 memset(mp->data, 0, PSIZE);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600688 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600690 unlock_page(page);
691 jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 return mp;
693
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600694unlock:
695 unlock_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 return NULL;
697}
698
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600699void grab_metapage(struct metapage * mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600701 jfs_info("grab_metapage: mp = 0x%p", mp);
702 page_cache_get(mp->page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 lock_page(mp->page);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600704 mp->count++;
705 lock_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 unlock_page(mp->page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600709void force_metapage(struct metapage *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710{
711 struct page *page = mp->page;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600712 jfs_info("force_metapage: mp = 0x%p", mp);
713 set_bit(META_forcewrite, &mp->flag);
714 clear_bit(META_sync, &mp->flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 page_cache_get(page);
716 lock_page(page);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600717 set_page_dirty(page);
718 write_one_page(page, 1);
719 clear_bit(META_forcewrite, &mp->flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 page_cache_release(page);
721}
722
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500723void hold_metapage(struct metapage *mp)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600724{
725 lock_page(mp->page);
726}
727
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500728void put_metapage(struct metapage *mp)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600729{
730 if (mp->count || mp->nohomeok) {
731 /* Someone else will release this */
732 unlock_page(mp->page);
733 return;
734 }
735 page_cache_get(mp->page);
736 mp->count++;
737 lock_metapage(mp);
738 unlock_page(mp->page);
739 release_metapage(mp);
740}
741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742void release_metapage(struct metapage * mp)
743{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600744 struct page *page = mp->page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag);
746
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600747 BUG_ON(!page);
748
749 lock_page(page);
750 unlock_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
752 assert(mp->count);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600753 if (--mp->count || mp->nohomeok) {
754 unlock_page(page);
755 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 return;
757 }
758
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600759 if (test_bit(META_dirty, &mp->flag)) {
760 set_page_dirty(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 if (test_bit(META_sync, &mp->flag)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 clear_bit(META_sync, &mp->flag);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600763 write_one_page(page, 1);
764 lock_page(page); /* write_one_page unlocks the page */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600766 } else if (mp->lsn) /* discard_metapage doesn't remove it */
767 remove_from_logsync(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600769 /* Try to keep metapages from using up too much memory */
770 drop_metapage(page, mp);
Dave Kleikampd0e671a2006-12-20 15:55:35 -0600771
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600772 unlock_page(page);
773 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
776void __invalidate_metapages(struct inode *ip, s64 addr, int len)
777{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600778 sector_t lblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 int l2BlocksPerPage = PAGE_CACHE_SHIFT - ip->i_blkbits;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600780 int BlocksPerPage = 1 << l2BlocksPerPage;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 /* All callers are interested in block device's mapping */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600782 struct address_space *mapping =
783 JFS_SBI(ip->i_sb)->direct_inode->i_mapping;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 struct metapage *mp;
785 struct page *page;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600786 unsigned int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
788 /*
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600789 * Mark metapages to discard. They will eventually be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 * released, but should not be written.
791 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600792 for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len;
793 lblock += BlocksPerPage) {
794 page = find_lock_page(mapping, lblock >> l2BlocksPerPage);
795 if (!page)
796 continue;
797 for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
798 mp = page_to_mp(page, offset);
799 if (!mp)
800 continue;
801 if (mp->index < addr)
802 continue;
803 if (mp->index >= addr + len)
804 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
806 clear_bit(META_dirty, &mp->flag);
807 set_bit(META_discard, &mp->flag);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600808 if (mp->lsn)
809 remove_from_logsync(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600811 unlock_page(page);
812 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 }
814}
815
816#ifdef CONFIG_JFS_STATISTICS
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -0500817static int jfs_mpstat_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818{
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -0500819 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 "JFS Metapage statistics\n"
821 "=======================\n"
822 "page allocations = %d\n"
823 "page frees = %d\n"
824 "lock waits = %d\n",
825 mpStat.pagealloc,
826 mpStat.pagefree,
827 mpStat.lockwait);
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -0500828 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829}
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -0500830
831static int jfs_mpstat_proc_open(struct inode *inode, struct file *file)
832{
833 return single_open(file, jfs_mpstat_proc_show, NULL);
834}
835
836const struct file_operations jfs_mpstat_proc_fops = {
837 .owner = THIS_MODULE,
838 .open = jfs_mpstat_proc_open,
839 .read = seq_read,
840 .llseek = seq_lseek,
841 .release = single_release,
842};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843#endif