blob: 49ba7ff1bbb9a15d8939128df2021354f2db6c52 [file] [log] [blame]
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);
Kent Overstreet4f024f32013-10-11 15:44:27 -0700419 if (!bio->bi_iter.bi_size)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600420 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;
Kent Overstreet4f024f32013-10-11 15:44:27 -0700441 bio->bi_iter.bi_sector = pblock << (inode->i_blkbits - 9);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600442 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;
Kent Overstreet4f024f32013-10-11 15:44:27 -0700455 if (!bio->bi_iter.bi_size)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600456 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;
Kent Overstreet4f024f32013-10-11 15:44:27 -0700520 bio->bi_iter.bi_sector =
521 pblock << (inode->i_blkbits - 9);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600522 bio->bi_end_io = metapage_read_end_io;
523 bio->bi_private = page;
524 len = xlen << inode->i_blkbits;
525 offset = block_offset << inode->i_blkbits;
526 if (bio_add_page(bio, page, len, offset) < len)
527 goto add_failed;
528 block_offset += xlen;
529 } else
530 block_offset++;
531 }
532 if (bio)
533 submit_bio(READ, bio);
534 else
535 unlock_page(page);
536
537 return 0;
538
539add_failed:
540 printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n");
541 bio_put(bio);
542 dec_io(page, last_read_complete);
543 return -EIO;
544}
545
Al Viro27496a82005-10-21 03:20:48 -0400546static int metapage_releasepage(struct page *page, gfp_t gfp_mask)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600547{
548 struct metapage *mp;
Dave Kleikampb9646382006-05-24 07:43:38 -0500549 int ret = 1;
Dave Kleikamp967c9ec2008-01-10 16:04:25 -0600550 int offset;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600551
552 for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
553 mp = page_to_mp(page, offset);
554
555 if (!mp)
556 continue;
557
558 jfs_info("metapage_releasepage: mp = 0x%p", mp);
Dave Kleikampb9646382006-05-24 07:43:38 -0500559 if (mp->count || mp->nohomeok ||
560 test_bit(META_dirty, &mp->flag)) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600561 jfs_info("count = %ld, nohomeok = %d", mp->count,
562 mp->nohomeok);
Dave Kleikampb9646382006-05-24 07:43:38 -0500563 ret = 0;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600564 continue;
565 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600566 if (mp->lsn)
567 remove_from_logsync(mp);
568 remove_metapage(page, mp);
569 INCREMENT(mpStat.pagefree);
570 free_metapage(mp);
571 }
Dave Kleikampb9646382006-05-24 07:43:38 -0500572 return ret;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600573}
574
Lukas Czernerd47992f2013-05-21 23:17:23 -0400575static void metapage_invalidatepage(struct page *page, unsigned int offset,
576 unsigned int length)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600577{
Lukas Czernerd47992f2013-05-21 23:17:23 -0400578 BUG_ON(offset || length < PAGE_CACHE_SIZE);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600579
NeilBrown2ff28e22006-03-26 01:37:18 -0800580 BUG_ON(PageWriteback(page));
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600581
NeilBrown2ff28e22006-03-26 01:37:18 -0800582 metapage_releasepage(page, 0);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600583}
584
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700585const struct address_space_operations jfs_metapage_aops = {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600586 .readpage = metapage_readpage,
587 .writepage = metapage_writepage,
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600588 .releasepage = metapage_releasepage,
589 .invalidatepage = metapage_invalidatepage,
590 .set_page_dirty = __set_page_dirty_nobuffers,
591};
592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593struct metapage *__get_metapage(struct inode *inode, unsigned long lblock,
594 unsigned int size, int absolute,
595 unsigned long new)
596{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 int l2BlocksPerPage;
598 int l2bsize;
599 struct address_space *mapping;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600600 struct metapage *mp = NULL;
601 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 unsigned long page_index;
603 unsigned long page_offset;
604
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600605 jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d",
606 inode->i_ino, lblock, absolute);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600608 l2bsize = inode->i_blkbits;
609 l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize;
610 page_index = lblock >> l2BlocksPerPage;
611 page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize;
612 if ((page_offset + size) > PAGE_CACHE_SIZE) {
613 jfs_err("MetaData crosses page boundary!!");
614 jfs_err("lblock = %lx, size = %d", lblock, size);
615 dump_stack();
616 return NULL;
617 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 if (absolute)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600619 mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 else {
621 /*
622 * If an nfs client tries to read an inode that is larger
623 * than any existing inodes, we may try to read past the
624 * end of the inode map
625 */
626 if ((lblock << inode->i_blkbits) >= inode->i_size)
627 return NULL;
628 mapping = inode->i_mapping;
629 }
630
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600631 if (new && (PSIZE == PAGE_CACHE_SIZE)) {
632 page = grab_cache_page(mapping, page_index);
633 if (!page) {
634 jfs_err("grab_cache_page failed!");
635 return NULL;
636 }
637 SetPageUptodate(page);
638 } else {
Pekka Enberg090d2b12006-06-23 02:05:08 -0700639 page = read_mapping_page(mapping, page_index, NULL);
Dave Kleikampc40c20242005-07-22 11:08:44 -0500640 if (IS_ERR(page) || !PageUptodate(page)) {
Pekka Enberg090d2b12006-06-23 02:05:08 -0700641 jfs_err("read_mapping_page failed!");
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600642 return NULL;
643 }
644 lock_page(page);
645 }
646
647 mp = page_to_mp(page, page_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 if (mp) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600649 if (mp->logical_size != size) {
650 jfs_error(inode->i_sb,
Joe Percheseb8630d2013-06-04 16:39:15 -0700651 "get_mp->logical_size != size\n");
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600652 jfs_err("logical_size = %d, size = %d",
653 mp->logical_size, size);
654 dump_stack();
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500655 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 }
657 mp->count++;
658 lock_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 if (test_bit(META_discard, &mp->flag)) {
660 if (!new) {
661 jfs_error(inode->i_sb,
Joe Percheseb8630d2013-06-04 16:39:15 -0700662 "using a discarded metapage\n");
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600663 discard_metapage(mp);
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500664 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 }
666 clear_bit(META_discard, &mp->flag);
667 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 } else {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600669 INCREMENT(mpStat.pagealloc);
670 mp = alloc_metapage(GFP_NOFS);
671 mp->page = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 mp->flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 mp->xflag = COMMIT_PAGE;
674 mp->count = 1;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600675 mp->nohomeok = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 mp->logical_size = size;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600677 mp->data = page_address(page) + page_offset;
678 mp->index = lblock;
679 if (unlikely(insert_metapage(page, mp))) {
680 free_metapage(mp);
681 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600683 lock_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 }
685
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600686 if (new) {
687 jfs_info("zeroing mp = 0x%p", mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 memset(mp->data, 0, PSIZE);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600689 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600691 unlock_page(page);
692 jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 return mp;
694
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600695unlock:
696 unlock_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 return NULL;
698}
699
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600700void grab_metapage(struct metapage * mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600702 jfs_info("grab_metapage: mp = 0x%p", mp);
703 page_cache_get(mp->page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 lock_page(mp->page);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600705 mp->count++;
706 lock_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 unlock_page(mp->page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708}
709
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600710void force_metapage(struct metapage *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711{
712 struct page *page = mp->page;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600713 jfs_info("force_metapage: mp = 0x%p", mp);
714 set_bit(META_forcewrite, &mp->flag);
715 clear_bit(META_sync, &mp->flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 page_cache_get(page);
717 lock_page(page);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600718 set_page_dirty(page);
719 write_one_page(page, 1);
720 clear_bit(META_forcewrite, &mp->flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 page_cache_release(page);
722}
723
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500724void hold_metapage(struct metapage *mp)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600725{
726 lock_page(mp->page);
727}
728
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500729void put_metapage(struct metapage *mp)
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600730{
731 if (mp->count || mp->nohomeok) {
732 /* Someone else will release this */
733 unlock_page(mp->page);
734 return;
735 }
736 page_cache_get(mp->page);
737 mp->count++;
738 lock_metapage(mp);
739 unlock_page(mp->page);
740 release_metapage(mp);
741}
742
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743void release_metapage(struct metapage * mp)
744{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600745 struct page *page = mp->page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag);
747
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600748 BUG_ON(!page);
749
750 lock_page(page);
751 unlock_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
753 assert(mp->count);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600754 if (--mp->count || mp->nohomeok) {
755 unlock_page(page);
756 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 return;
758 }
759
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600760 if (test_bit(META_dirty, &mp->flag)) {
761 set_page_dirty(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 if (test_bit(META_sync, &mp->flag)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 clear_bit(META_sync, &mp->flag);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600764 write_one_page(page, 1);
765 lock_page(page); /* write_one_page unlocks the page */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600767 } else if (mp->lsn) /* discard_metapage doesn't remove it */
768 remove_from_logsync(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600770 /* Try to keep metapages from using up too much memory */
771 drop_metapage(page, mp);
Dave Kleikampd0e671a2006-12-20 15:55:35 -0600772
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600773 unlock_page(page);
774 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775}
776
777void __invalidate_metapages(struct inode *ip, s64 addr, int len)
778{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600779 sector_t lblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 int l2BlocksPerPage = PAGE_CACHE_SHIFT - ip->i_blkbits;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600781 int BlocksPerPage = 1 << l2BlocksPerPage;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 /* All callers are interested in block device's mapping */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600783 struct address_space *mapping =
784 JFS_SBI(ip->i_sb)->direct_inode->i_mapping;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 struct metapage *mp;
786 struct page *page;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600787 unsigned int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
789 /*
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600790 * Mark metapages to discard. They will eventually be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 * released, but should not be written.
792 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600793 for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len;
794 lblock += BlocksPerPage) {
795 page = find_lock_page(mapping, lblock >> l2BlocksPerPage);
796 if (!page)
797 continue;
798 for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
799 mp = page_to_mp(page, offset);
800 if (!mp)
801 continue;
802 if (mp->index < addr)
803 continue;
804 if (mp->index >= addr + len)
805 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
807 clear_bit(META_dirty, &mp->flag);
808 set_bit(META_discard, &mp->flag);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600809 if (mp->lsn)
810 remove_from_logsync(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600812 unlock_page(page);
813 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 }
815}
816
817#ifdef CONFIG_JFS_STATISTICS
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -0500818static int jfs_mpstat_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819{
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -0500820 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 "JFS Metapage statistics\n"
822 "=======================\n"
823 "page allocations = %d\n"
824 "page frees = %d\n"
825 "lock waits = %d\n",
826 mpStat.pagealloc,
827 mpStat.pagefree,
828 mpStat.lockwait);
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -0500829 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -0500831
832static int jfs_mpstat_proc_open(struct inode *inode, struct file *file)
833{
834 return single_open(file, jfs_mpstat_proc_show, NULL);
835}
836
837const struct file_operations jfs_mpstat_proc_fops = {
838 .owner = THIS_MODULE,
839 .open = jfs_mpstat_proc_open,
840 .read = seq_read,
841 .llseek = seq_lseek,
842 .release = single_release,
843};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844#endif