blob: 4ad4f94edebe25cc8afa3fa7c4ec35913cb00642 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Bob Peterson7eabb772008-01-28 11:24:35 -06003 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/pagemap.h>
Steven Whitehousefd88de562006-05-05 16:59:11 -040016#include <linux/pagevec.h>
Steven Whitehouse9b124fb2006-01-30 11:55:32 +000017#include <linux/mpage.h>
Steven Whitehoused1665e42006-02-14 11:54:42 +000018#include <linux/fs.h>
Steven Whitehousea8d638e2007-01-15 13:52:17 +000019#include <linux/writeback.h>
Steven Whitehouse7765ec22007-10-16 01:25:07 -070020#include <linux/swap.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050021#include <linux/gfs2_ondisk.h>
Steven Whitehouse47e83b52007-10-18 11:15:50 +010022#include <linux/backing-dev.h>
Kent Overstreeta27bb332013-05-07 16:19:08 -070023#include <linux/aio.h>
Steven Whitehouse774016b2014-02-06 15:47:47 +000024#include <trace/events/writeback.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000025
26#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050027#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000028#include "bmap.h"
29#include "glock.h"
30#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000031#include "log.h"
32#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000033#include "quota.h"
34#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000035#include "rgrp.h"
Robert Petersoncd81a4b2007-05-14 12:42:18 -050036#include "super.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050037#include "util.h"
Steven Whitehouse4340fe62006-07-11 09:46:33 -040038#include "glops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000039
Steven Whitehouseba7f7292006-07-26 11:27:10 -040040
Bob Petersonb1201932012-04-11 12:58:07 -040041static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
42 unsigned int from, unsigned int to)
Steven Whitehouseba7f7292006-07-26 11:27:10 -040043{
44 struct buffer_head *head = page_buffers(page);
45 unsigned int bsize = head->b_size;
46 struct buffer_head *bh;
47 unsigned int start, end;
48
49 for (bh = head, start = 0; bh != head || !start;
50 bh = bh->b_this_page, start = end) {
51 end = start + bsize;
52 if (end <= from || start >= to)
53 continue;
Benjamin Marzinskiddf4b422007-06-01 14:21:38 -050054 if (gfs2_is_jdata(ip))
55 set_buffer_uptodate(bh);
Steven Whitehouse350a9b02012-12-14 12:36:02 +000056 gfs2_trans_add_data(ip->i_gl, bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -040057 }
58}
59
David Teiglandb3b94fa2006-01-16 16:50:04 +000060/**
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040061 * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
David Teiglandb3b94fa2006-01-16 16:50:04 +000062 * @inode: The inode
63 * @lblock: The block number to look up
64 * @bh_result: The buffer head to return the result in
65 * @create: Non-zero if we may add block to the file
66 *
67 * Returns: errno
68 */
69
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040070static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
71 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000072{
David Teiglandb3b94fa2006-01-16 16:50:04 +000073 int error;
74
Bob Petersone9e1ef22007-12-10 14:13:27 -060075 error = gfs2_block_map(inode, lblock, bh_result, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +000076 if (error)
77 return error;
Wendy Chengde986e82007-09-18 09:19:13 -040078 if (!buffer_mapped(bh_result))
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040079 return -EIO;
Steven Whitehouse623d9352006-08-31 12:14:44 -040080 return 0;
81}
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040082
83static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
84 struct buffer_head *bh_result, int create)
85{
Bob Petersone9e1ef22007-12-10 14:13:27 -060086 return gfs2_block_map(inode, lblock, bh_result, 0);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040087}
88
David Teiglandb3b94fa2006-01-16 16:50:04 +000089/**
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010090 * gfs2_writepage_common - Common bits of writepage
91 * @page: The page to be written
92 * @wbc: The writeback control
David Teiglandb3b94fa2006-01-16 16:50:04 +000093 *
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010094 * Returns: 1 if writepage is ok, otherwise an error code or zero if no error.
David Teiglandb3b94fa2006-01-16 16:50:04 +000095 */
96
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010097static int gfs2_writepage_common(struct page *page,
98 struct writeback_control *wbc)
David Teiglandb3b94fa2006-01-16 16:50:04 +000099{
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000100 struct inode *inode = page->mapping->host;
Steven Whitehousef4387142006-08-08 13:23:19 -0400101 struct gfs2_inode *ip = GFS2_I(inode);
102 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000103 loff_t i_size = i_size_read(inode);
104 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
105 unsigned offset;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100106
107 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
108 goto out;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100109 if (current->journal_info)
110 goto redirty;
111 /* Is the page fully outside i_size? (truncate in progress) */
112 offset = i_size & (PAGE_CACHE_SIZE-1);
113 if (page->index > end_index || (page->index == end_index && !offset)) {
Lukas Czernerd47992f2013-05-21 23:17:23 -0400114 page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE);
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100115 goto out;
116 }
117 return 1;
118redirty:
119 redirty_page_for_writepage(wbc, page);
120out:
121 unlock_page(page);
122 return 0;
123}
124
125/**
Steven Whitehouse9d358142013-08-27 21:22:07 +0100126 * gfs2_writepage - Write page for writeback mappings
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100127 * @page: The page
128 * @wbc: The writeback control
129 *
130 */
131
Steven Whitehouse9d358142013-08-27 21:22:07 +0100132static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100133{
134 int ret;
135
136 ret = gfs2_writepage_common(page, wbc);
137 if (ret <= 0)
138 return ret;
139
Steven Whitehouse30116ff2010-06-14 09:58:41 +0100140 return nobh_writepage(page, gfs2_get_block_noalloc, wbc);
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100141}
142
143/**
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100144 * __gfs2_jdata_writepage - The core of jdata writepage
145 * @page: The page to write
146 * @wbc: The writeback control
147 *
148 * This is shared between writepage and writepages and implements the
149 * core of the writepage operation. If a transaction is required then
150 * PageChecked will have been set and the transaction will have
151 * already been started before this is called.
152 */
153
154static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
155{
156 struct inode *inode = page->mapping->host;
157 struct gfs2_inode *ip = GFS2_I(inode);
158 struct gfs2_sbd *sdp = GFS2_SB(inode);
159
160 if (PageChecked(page)) {
161 ClearPageChecked(page);
162 if (!page_has_buffers(page)) {
163 create_empty_buffers(page, inode->i_sb->s_blocksize,
164 (1 << BH_Dirty)|(1 << BH_Uptodate));
165 }
166 gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
167 }
168 return block_write_full_page(page, gfs2_get_block_noalloc, wbc);
169}
170
171/**
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100172 * gfs2_jdata_writepage - Write complete page
173 * @page: Page to write
174 *
175 * Returns: errno
176 *
177 */
178
179static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
180{
181 struct inode *inode = page->mapping->host;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100182 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100183 int ret;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000184 int done_trans = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000185
Steven Whitehousebf36a712007-10-17 08:35:19 +0100186 if (PageChecked(page)) {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100187 if (wbc->sync_mode != WB_SYNC_ALL)
188 goto out_ignore;
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100189 ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
190 if (ret)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000191 goto out_ignore;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000192 done_trans = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000193 }
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100194 ret = gfs2_writepage_common(page, wbc);
195 if (ret > 0)
196 ret = __gfs2_jdata_writepage(page, wbc);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000197 if (done_trans)
198 gfs2_trans_end(sdp);
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100199 return ret;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000200
201out_ignore:
202 redirty_page_for_writepage(wbc, page);
203 unlock_page(page);
204 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000205}
206
207/**
Steven Whitehouse45138992013-01-28 09:30:07 +0000208 * gfs2_writepages - Write a bunch of dirty pages back to disk
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000209 * @mapping: The mapping to write
210 * @wbc: Write-back control
211 *
Steven Whitehouse45138992013-01-28 09:30:07 +0000212 * Used for both ordered and writeback modes.
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000213 */
Steven Whitehouse45138992013-01-28 09:30:07 +0000214static int gfs2_writepages(struct address_space *mapping,
215 struct writeback_control *wbc)
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000216{
Steven Whitehouse55610932007-10-17 08:47:38 +0100217 return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000218}
219
220/**
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100221 * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages
222 * @mapping: The mapping
223 * @wbc: The writeback control
224 * @writepage: The writepage function to call for each page
225 * @pvec: The vector of pages
226 * @nr_pages: The number of pages to write
227 *
228 * Returns: non-zero if loop should terminate, zero otherwise
229 */
230
231static int gfs2_write_jdata_pagevec(struct address_space *mapping,
232 struct writeback_control *wbc,
233 struct pagevec *pvec,
Steven Whitehouse774016b2014-02-06 15:47:47 +0000234 int nr_pages, pgoff_t end,
235 pgoff_t *done_index)
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100236{
237 struct inode *inode = mapping->host;
238 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100239 unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100240 int i;
241 int ret;
242
Abhijith Das20b95bf2008-03-06 17:43:52 -0600243 ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100244 if (ret < 0)
245 return ret;
246
247 for(i = 0; i < nr_pages; i++) {
248 struct page *page = pvec->pages[i];
249
Steven Whitehouse774016b2014-02-06 15:47:47 +0000250 /*
251 * At this point, the page may be truncated or
252 * invalidated (changing page->mapping to NULL), or
253 * even swizzled back from swapper_space to tmpfs file
254 * mapping. However, page->index will not change
255 * because we have a reference on the page.
256 */
257 if (page->index > end) {
258 /*
259 * can't be range_cyclic (1st pass) because
260 * end == -1 in that case.
261 */
262 ret = 1;
263 break;
264 }
265
266 *done_index = page->index;
267
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100268 lock_page(page);
269
270 if (unlikely(page->mapping != mapping)) {
Steven Whitehouse774016b2014-02-06 15:47:47 +0000271continue_unlock:
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100272 unlock_page(page);
273 continue;
274 }
275
Steven Whitehouse774016b2014-02-06 15:47:47 +0000276 if (!PageDirty(page)) {
277 /* someone wrote it for us */
278 goto continue_unlock;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100279 }
280
Steven Whitehouse774016b2014-02-06 15:47:47 +0000281 if (PageWriteback(page)) {
282 if (wbc->sync_mode != WB_SYNC_NONE)
283 wait_on_page_writeback(page);
284 else
285 goto continue_unlock;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100286 }
287
Steven Whitehouse774016b2014-02-06 15:47:47 +0000288 BUG_ON(PageWriteback(page));
289 if (!clear_page_dirty_for_io(page))
290 goto continue_unlock;
291
Christoph Hellwigde1414a2015-01-14 10:42:36 +0100292 trace_wbc_writepage(wbc, inode_to_bdi(inode));
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100293
294 ret = __gfs2_jdata_writepage(page, wbc);
Steven Whitehouse774016b2014-02-06 15:47:47 +0000295 if (unlikely(ret)) {
296 if (ret == AOP_WRITEPAGE_ACTIVATE) {
297 unlock_page(page);
298 ret = 0;
299 } else {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100300
Steven Whitehouse774016b2014-02-06 15:47:47 +0000301 /*
302 * done_index is set past this page,
303 * so media errors will not choke
304 * background writeout for the entire
305 * file. This has consequences for
306 * range_cyclic semantics (ie. it may
307 * not be suitable for data integrity
308 * writeout).
309 */
310 *done_index = page->index + 1;
311 ret = 1;
312 break;
313 }
314 }
315
316 /*
317 * We stop writing back only if we are not doing
318 * integrity sync. In case of integrity sync we have to
319 * keep going until we have written all the pages
320 * we tagged for writeback prior to entering this loop.
321 */
322 if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100323 ret = 1;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000324 break;
325 }
326
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100327 }
328 gfs2_trans_end(sdp);
329 return ret;
330}
331
332/**
333 * gfs2_write_cache_jdata - Like write_cache_pages but different
334 * @mapping: The mapping to write
335 * @wbc: The writeback control
336 * @writepage: The writepage function to call
337 * @data: The data to pass to writepage
338 *
339 * The reason that we use our own function here is that we need to
340 * start transactions before we grab page locks. This allows us
341 * to get the ordering right.
342 */
343
344static int gfs2_write_cache_jdata(struct address_space *mapping,
345 struct writeback_control *wbc)
346{
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100347 int ret = 0;
348 int done = 0;
349 struct pagevec pvec;
350 int nr_pages;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000351 pgoff_t uninitialized_var(writeback_index);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100352 pgoff_t index;
353 pgoff_t end;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000354 pgoff_t done_index;
355 int cycled;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100356 int range_whole = 0;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000357 int tag;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100358
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100359 pagevec_init(&pvec, 0);
360 if (wbc->range_cyclic) {
Steven Whitehouse774016b2014-02-06 15:47:47 +0000361 writeback_index = mapping->writeback_index; /* prev offset */
362 index = writeback_index;
363 if (index == 0)
364 cycled = 1;
365 else
366 cycled = 0;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100367 end = -1;
368 } else {
369 index = wbc->range_start >> PAGE_CACHE_SHIFT;
370 end = wbc->range_end >> PAGE_CACHE_SHIFT;
371 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
372 range_whole = 1;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000373 cycled = 1; /* ignore range_cyclic tests */
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100374 }
Steven Whitehouse774016b2014-02-06 15:47:47 +0000375 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
376 tag = PAGECACHE_TAG_TOWRITE;
377 else
378 tag = PAGECACHE_TAG_DIRTY;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100379
380retry:
Steven Whitehouse774016b2014-02-06 15:47:47 +0000381 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
382 tag_pages_for_writeback(mapping, index, end);
383 done_index = index;
384 while (!done && (index <= end)) {
385 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
386 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
387 if (nr_pages == 0)
388 break;
389
390 ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end, &done_index);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100391 if (ret)
392 done = 1;
393 if (ret > 0)
394 ret = 0;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100395 pagevec_release(&pvec);
396 cond_resched();
397 }
398
Steven Whitehouse774016b2014-02-06 15:47:47 +0000399 if (!cycled && !done) {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100400 /*
Steven Whitehouse774016b2014-02-06 15:47:47 +0000401 * range_cyclic:
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100402 * We hit the last page and there is more work to be done: wrap
403 * back to the start of the file
404 */
Steven Whitehouse774016b2014-02-06 15:47:47 +0000405 cycled = 1;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100406 index = 0;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000407 end = writeback_index - 1;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100408 goto retry;
409 }
410
411 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
Steven Whitehouse774016b2014-02-06 15:47:47 +0000412 mapping->writeback_index = done_index;
413
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100414 return ret;
415}
416
417
418/**
419 * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
420 * @mapping: The mapping to write
421 * @wbc: The writeback control
422 *
423 */
424
425static int gfs2_jdata_writepages(struct address_space *mapping,
426 struct writeback_control *wbc)
427{
428 struct gfs2_inode *ip = GFS2_I(mapping->host);
429 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
430 int ret;
431
432 ret = gfs2_write_cache_jdata(mapping, wbc);
433 if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
Benjamin Marzinski24972552014-05-01 22:26:55 -0500434 gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100435 ret = gfs2_write_cache_jdata(mapping, wbc);
436 }
437 return ret;
438}
439
440/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000441 * stuffed_readpage - Fill in a Linux page with stuffed file data
442 * @ip: the inode
443 * @page: the page
444 *
445 * Returns: errno
446 */
447
448static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
449{
450 struct buffer_head *dibh;
Steven Whitehouse602c89d2010-03-25 14:32:43 +0000451 u64 dsize = i_size_read(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000452 void *kaddr;
453 int error;
454
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100455 /*
Nick Piggin3c18ddd2008-04-28 02:12:10 -0700456 * Due to the order of unstuffing files and ->fault(), we can be
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100457 * asked for a zero page in the case of a stuffed file being extended,
458 * so we need to supply one here. It doesn't happen often.
459 */
460 if (unlikely(page->index)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800461 zero_user(page, 0, PAGE_CACHE_SIZE);
Abhijith Das0a7ab792009-01-07 16:03:37 -0600462 SetPageUptodate(page);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100463 return 0;
464 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400465
David Teiglandb3b94fa2006-01-16 16:50:04 +0000466 error = gfs2_meta_inode_buffer(ip, &dibh);
467 if (error)
468 return error;
469
Cong Wangd9349282011-11-25 23:14:30 +0800470 kaddr = kmap_atomic(page);
Steven Whitehouse602c89d2010-03-25 14:32:43 +0000471 if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
472 dsize = (dibh->b_size - sizeof(struct gfs2_dinode));
473 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
474 memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize);
Cong Wangd9349282011-11-25 23:14:30 +0800475 kunmap_atomic(kaddr);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100476 flush_dcache_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000477 brelse(dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000478 SetPageUptodate(page);
479
480 return 0;
481}
482
David Teiglandb3b94fa2006-01-16 16:50:04 +0000483
484/**
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100485 * __gfs2_readpage - readpage
486 * @file: The file to read a page for
David Teiglandb3b94fa2006-01-16 16:50:04 +0000487 * @page: The page to read
488 *
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100489 * This is the core of gfs2's readpage. Its used by the internal file
490 * reading code as in that case we already hold the glock. Also its
491 * called by gfs2_readpage() once the required lock has been granted.
492 *
493 */
494
495static int __gfs2_readpage(void *file, struct page *page)
496{
497 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
498 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
499 int error;
500
501 if (gfs2_is_stuffed(ip)) {
502 error = stuffed_readpage(ip, page);
503 unlock_page(page);
504 } else {
Bob Petersone9e1ef22007-12-10 14:13:27 -0600505 error = mpage_readpage(page, gfs2_block_map);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100506 }
507
508 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
509 return -EIO;
510
511 return error;
512}
513
514/**
515 * gfs2_readpage - read a page of a file
516 * @file: The file to read
517 * @page: The page of the file
518 *
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100519 * This deals with the locking required. We have to unlock and
520 * relock the page in order to get the locking in the right
521 * order.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000522 */
523
524static int gfs2_readpage(struct file *file, struct page *page)
525{
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100526 struct address_space *mapping = page->mapping;
527 struct gfs2_inode *ip = GFS2_I(mapping->host);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100528 struct gfs2_holder gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000529 int error;
530
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100531 unlock_page(page);
Steven Whitehouse719ee342008-09-18 13:53:59 +0100532 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
533 error = gfs2_glock_nq(&gh);
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100534 if (unlikely(error))
Steven Whitehouse6802e342008-05-21 17:03:22 +0100535 goto out;
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100536 error = AOP_TRUNCATED_PAGE;
537 lock_page(page);
538 if (page->mapping == mapping && !PageUptodate(page))
539 error = __gfs2_readpage(file, page);
540 else
541 unlock_page(page);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100542 gfs2_glock_dq(&gh);
Steven Whitehouse7afd88d2008-02-22 16:07:18 +0000543out:
Steven Whitehouse6802e342008-05-21 17:03:22 +0100544 gfs2_holder_uninit(&gh);
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100545 if (error && error != AOP_TRUNCATED_PAGE)
546 lock_page(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100547 return error;
548}
549
550/**
551 * gfs2_internal_read - read an internal file
552 * @ip: The gfs2 inode
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100553 * @buf: The buffer to fill
554 * @pos: The file position
555 * @size: The amount to read
556 *
557 */
558
Andrew Price43066292012-04-16 16:40:55 +0100559int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
560 unsigned size)
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100561{
562 struct address_space *mapping = ip->i_inode.i_mapping;
563 unsigned long index = *pos / PAGE_CACHE_SIZE;
564 unsigned offset = *pos & (PAGE_CACHE_SIZE - 1);
565 unsigned copied = 0;
566 unsigned amt;
567 struct page *page;
568 void *p;
569
570 do {
571 amt = size - copied;
572 if (offset + size > PAGE_CACHE_SIZE)
573 amt = PAGE_CACHE_SIZE - offset;
574 page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
575 if (IS_ERR(page))
576 return PTR_ERR(page);
Cong Wangd9349282011-11-25 23:14:30 +0800577 p = kmap_atomic(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100578 memcpy(buf + copied, p + offset, amt);
Cong Wangd9349282011-11-25 23:14:30 +0800579 kunmap_atomic(p);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100580 page_cache_release(page);
581 copied += amt;
582 index++;
583 offset = 0;
584 } while(copied < size);
585 (*pos) += size;
586 return size;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400587}
588
Steven Whitehousefd88de562006-05-05 16:59:11 -0400589/**
590 * gfs2_readpages - Read a bunch of pages at once
591 *
592 * Some notes:
593 * 1. This is only for readahead, so we can simply ignore any things
594 * which are slightly inconvenient (such as locking conflicts between
595 * the page lock and the glock) and return having done no I/O. Its
596 * obviously not something we'd want to do on too regular a basis.
597 * Any I/O we ignore at this time will be done via readpage later.
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500598 * 2. We don't handle stuffed files here we let readpage do the honours.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400599 * 3. mpage_readpages() does most of the heavy lifting in the common case.
Bob Petersone9e1ef22007-12-10 14:13:27 -0600600 * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400601 */
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100602
Steven Whitehousefd88de562006-05-05 16:59:11 -0400603static int gfs2_readpages(struct file *file, struct address_space *mapping,
604 struct list_head *pages, unsigned nr_pages)
605{
606 struct inode *inode = mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400607 struct gfs2_inode *ip = GFS2_I(inode);
608 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400609 struct gfs2_holder gh;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100610 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400611
Steven Whitehouse719ee342008-09-18 13:53:59 +0100612 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
613 ret = gfs2_glock_nq(&gh);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100614 if (unlikely(ret))
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100615 goto out_uninit;
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500616 if (!gfs2_is_stuffed(ip))
Bob Petersone9e1ef22007-12-10 14:13:27 -0600617 ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100618 gfs2_glock_dq(&gh);
619out_uninit:
620 gfs2_holder_uninit(&gh);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400621 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
622 ret = -EIO;
623 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000624}
625
626/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700627 * gfs2_write_begin - Begin to write to a file
David Teiglandb3b94fa2006-01-16 16:50:04 +0000628 * @file: The file to write to
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700629 * @mapping: The mapping in which to write
630 * @pos: The file offset at which to start writing
631 * @len: Length of the write
632 * @flags: Various flags
633 * @pagep: Pointer to return the page
634 * @fsdata: Pointer to return fs data (unused by GFS2)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000635 *
636 * Returns: errno
637 */
638
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700639static int gfs2_write_begin(struct file *file, struct address_space *mapping,
640 loff_t pos, unsigned len, unsigned flags,
641 struct page **pagep, void **fsdata)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000642{
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700643 struct gfs2_inode *ip = GFS2_I(mapping->host);
644 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500645 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000646 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100647 unsigned requested = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000648 int alloc_required;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000649 int error = 0;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700650 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
651 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700652 struct page *page;
Russell Cattelan52ae7b72006-10-09 12:11:54 -0500653
Steven Whitehouse719ee342008-09-18 13:53:59 +0100654 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
655 error = gfs2_glock_nq(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700656 if (unlikely(error))
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000657 goto out_uninit;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500658 if (&ip->i_inode == sdp->sd_rindex) {
659 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
660 GL_NOCACHE, &m_ip->i_gh);
661 if (unlikely(error)) {
662 gfs2_glock_dq(&ip->i_gh);
663 goto out_uninit;
664 }
665 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000666
Bob Peterson461cb412010-06-24 19:21:20 -0400667 alloc_required = gfs2_write_alloc_required(ip, pos, len);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000668
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000669 if (alloc_required || gfs2_is_jdata(ip))
670 gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
671
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000672 if (alloc_required) {
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100673 struct gfs2_alloc_parms ap = { .aflags = 0, };
Steven Whitehoused82661d2008-03-10 15:34:50 +0000674 error = gfs2_quota_lock_check(ip);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000675 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -0400676 goto out_unlock;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000677
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100678 requested = data_blocks + ind_blocks;
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100679 ap.target = requested;
680 error = gfs2_inplace_reserve(ip, &ap);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000681 if (error)
682 goto out_qunlock;
683 }
684
685 rblocks = RES_DINODE + ind_blocks;
686 if (gfs2_is_jdata(ip))
687 rblocks += data_blocks ? data_blocks : 1;
688 if (ind_blocks || data_blocks)
689 rblocks += RES_STATFS + RES_QUOTA;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500690 if (&ip->i_inode == sdp->sd_rindex)
691 rblocks += 2 * RES_STATFS;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500692 if (alloc_required)
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100693 rblocks += gfs2_rg_blocks(ip, requested);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000694
Steven Whitehouse16615be2007-09-17 10:59:52 +0100695 error = gfs2_trans_begin(sdp, rblocks,
696 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000697 if (error)
Steven Whitehousea867bb22007-07-17 10:29:02 +0100698 goto out_trans_fail;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000699
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100700 error = -ENOMEM;
Steven Whitehousee4fefba2009-01-06 10:08:33 +0000701 flags |= AOP_FLAG_NOFS;
Nick Piggin54566b22009-01-04 12:00:53 -0800702 page = grab_cache_page_write_begin(mapping, index, flags);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100703 *pagep = page;
704 if (unlikely(!page))
705 goto out_endtrans;
706
David Teiglandb3b94fa2006-01-16 16:50:04 +0000707 if (gfs2_is_stuffed(ip)) {
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100708 error = 0;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700709 if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400710 error = gfs2_unstuff_dinode(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000711 if (error == 0)
712 goto prepare_write;
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100713 } else if (!PageUptodate(page)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000714 error = stuffed_readpage(ip, page);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100715 }
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000716 goto out;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000717 }
718
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000719prepare_write:
Christoph Hellwigebdec242010-10-06 10:47:23 +0200720 error = __block_write_begin(page, from, len, gfs2_block_map);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000721out:
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100722 if (error == 0)
723 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000724
Maxim6c474f72011-03-14 13:19:21 +0000725 unlock_page(page);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100726 page_cache_release(page);
npiggin@suse.de15c6fd92010-05-27 01:05:34 +1000727
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100728 gfs2_trans_end(sdp);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100729 if (pos + len > ip->i_inode.i_size)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100730 gfs2_trim_blocks(&ip->i_inode);
731 goto out_trans_fail;
732
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100733out_endtrans:
734 gfs2_trans_end(sdp);
735out_trans_fail:
736 if (alloc_required) {
737 gfs2_inplace_release(ip);
738out_qunlock:
739 gfs2_quota_unlock(ip);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100740 }
741out_unlock:
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500742 if (&ip->i_inode == sdp->sd_rindex) {
743 gfs2_glock_dq(&m_ip->i_gh);
744 gfs2_holder_uninit(&m_ip->i_gh);
745 }
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100746 gfs2_glock_dq(&ip->i_gh);
747out_uninit:
748 gfs2_holder_uninit(&ip->i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000749 return error;
750}
751
752/**
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500753 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
754 * @inode: the rindex inode
755 */
756static void adjust_fs_space(struct inode *inode)
757{
758 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500759 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
760 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500761 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
762 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500763 struct buffer_head *m_bh, *l_bh;
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500764 u64 fs_total, new_free;
765
766 /* Total up the file system space, according to the latest rindex. */
767 fs_total = gfs2_ri_total(sdp);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500768 if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
769 return;
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500770
771 spin_lock(&sdp->sd_statfs_spin);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500772 gfs2_statfs_change_in(m_sc, m_bh->b_data +
773 sizeof(struct gfs2_dinode));
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500774 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
775 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
776 else
777 new_free = 0;
778 spin_unlock(&sdp->sd_statfs_spin);
Robert Peterson6c532672007-05-10 16:54:38 -0500779 fs_warn(sdp, "File system extended by %llu blocks.\n",
780 (unsigned long long)new_free);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500781 gfs2_statfs_change(sdp, new_free, new_free, 0);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500782
783 if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0)
784 goto out;
785 update_statfs(sdp, m_bh, l_bh);
786 brelse(l_bh);
787out:
788 brelse(m_bh);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500789}
790
791/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700792 * gfs2_stuffed_write_end - Write end for stuffed files
793 * @inode: The inode
794 * @dibh: The buffer_head containing the on-disk inode
795 * @pos: The file position
796 * @len: The length of the write
797 * @copied: How much was actually copied by the VFS
798 * @page: The page
799 *
800 * This copies the data from the page into the inode block after
801 * the inode data structure itself.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000802 *
803 * Returns: errno
804 */
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700805static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
806 loff_t pos, unsigned len, unsigned copied,
807 struct page *page)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000808{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400809 struct gfs2_inode *ip = GFS2_I(inode);
810 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500811 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700812 u64 to = pos + copied;
813 void *kaddr;
814 unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000815
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700816 BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode)));
Cong Wangd9349282011-11-25 23:14:30 +0800817 kaddr = kmap_atomic(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700818 memcpy(buf + pos, kaddr + pos, copied);
819 memset(kaddr + pos + copied, 0, len - copied);
820 flush_dcache_page(page);
Cong Wangd9349282011-11-25 23:14:30 +0800821 kunmap_atomic(kaddr);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000822
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700823 if (!PageUptodate(page))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000824 SetPageUptodate(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700825 unlock_page(page);
826 page_cache_release(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000827
Abhijith Das7537d81a2009-05-12 11:16:20 -0500828 if (copied) {
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100829 if (inode->i_size < to)
Abhijith Das7537d81a2009-05-12 11:16:20 -0500830 i_size_write(inode, to);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700831 mark_inode_dirty(inode);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400832 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000833
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600834 if (inode == sdp->sd_rindex) {
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500835 adjust_fs_space(inode);
Bob Petersonca9248d2012-04-10 08:56:04 -0400836 sdp->sd_rindex_uptodate = 0;
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600837 }
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500838
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000839 brelse(dibh);
840 gfs2_trans_end(sdp);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500841 if (inode == sdp->sd_rindex) {
842 gfs2_glock_dq(&m_ip->i_gh);
843 gfs2_holder_uninit(&m_ip->i_gh);
844 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700845 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000846 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700847 return copied;
848}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000849
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700850/**
851 * gfs2_write_end
852 * @file: The file to write to
853 * @mapping: The address space to write to
854 * @pos: The file position
855 * @len: The length of the data
856 * @copied:
857 * @page: The page that has been written
858 * @fsdata: The fsdata (unused in GFS2)
859 *
860 * The main write_end function for GFS2. We have a separate one for
861 * stuffed files as they are slightly different, otherwise we just
862 * put our locking around the VFS provided functions.
863 *
864 * Returns: errno
865 */
866
867static int gfs2_write_end(struct file *file, struct address_space *mapping,
868 loff_t pos, unsigned len, unsigned copied,
869 struct page *page, void *fsdata)
870{
871 struct inode *inode = page->mapping->host;
872 struct gfs2_inode *ip = GFS2_I(inode);
873 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500874 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700875 struct buffer_head *dibh;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700876 unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
877 unsigned int to = from + len;
878 int ret;
Benjamin Marzinski0c901802013-09-03 16:59:42 -0500879 struct gfs2_trans *tr = current->journal_info;
880 BUG_ON(!tr);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700881
Steven Whitehouse7afd88d2008-02-22 16:07:18 +0000882 BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700883
884 ret = gfs2_meta_inode_buffer(ip, &dibh);
885 if (unlikely(ret)) {
886 unlock_page(page);
887 page_cache_release(page);
888 goto failed;
889 }
890
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700891 if (gfs2_is_stuffed(ip))
892 return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
893
Steven Whitehousebf36a712007-10-17 08:35:19 +0100894 if (!gfs2_is_writeback(ip))
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700895 gfs2_page_add_databufs(ip, page, from, to);
896
897 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
Benjamin Marzinski0c901802013-09-03 16:59:42 -0500898 if (tr->tr_num_buf_new)
899 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
900 else
901 gfs2_trans_add_meta(ip->i_gl, dibh);
902
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700903
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600904 if (inode == sdp->sd_rindex) {
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700905 adjust_fs_space(inode);
Bob Petersonca9248d2012-04-10 08:56:04 -0400906 sdp->sd_rindex_uptodate = 0;
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600907 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700908
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000909 brelse(dibh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700910failed:
Bob Petersondeab72d2011-03-16 16:32:39 -0400911 gfs2_trans_end(sdp);
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100912 gfs2_inplace_release(ip);
Bob Peterson5407e242012-05-18 09:28:23 -0400913 if (ip->i_res->rs_qa_qd_num)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000914 gfs2_quota_unlock(ip);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500915 if (inode == sdp->sd_rindex) {
916 gfs2_glock_dq(&m_ip->i_gh);
917 gfs2_holder_uninit(&m_ip->i_gh);
918 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700919 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000920 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700921 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000922}
923
924/**
Robert Peterson8fb68592007-06-12 11:24:36 -0500925 * gfs2_set_page_dirty - Page dirtying function
926 * @page: The page to dirty
927 *
928 * Returns: 1 if it dirtyed the page, or 0 otherwise
929 */
930
931static int gfs2_set_page_dirty(struct page *page)
932{
Steven Whitehouse55610932007-10-17 08:47:38 +0100933 SetPageChecked(page);
Robert Peterson8fb68592007-06-12 11:24:36 -0500934 return __set_page_dirty_buffers(page);
935}
936
937/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000938 * gfs2_bmap - Block map function
939 * @mapping: Address space info
940 * @lblock: The block to map
941 *
942 * Returns: The disk address for the block or 0 on hole or error
943 */
944
945static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
946{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400947 struct gfs2_inode *ip = GFS2_I(mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000948 struct gfs2_holder i_gh;
949 sector_t dblock = 0;
950 int error;
951
David Teiglandb3b94fa2006-01-16 16:50:04 +0000952 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
953 if (error)
954 return 0;
955
956 if (!gfs2_is_stuffed(ip))
Bob Petersone9e1ef22007-12-10 14:13:27 -0600957 dblock = generic_block_bmap(mapping, lblock, gfs2_block_map);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000958
959 gfs2_glock_dq_uninit(&i_gh);
960
961 return dblock;
962}
963
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100964static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
965{
966 struct gfs2_bufdata *bd;
967
968 lock_buffer(bh);
969 gfs2_log_lock(sdp);
970 clear_buffer_dirty(bh);
971 bd = bh->b_private;
972 if (bd) {
Bob Petersonc0752aa2012-05-01 12:00:34 -0400973 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
974 list_del_init(&bd->bd_list);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100975 else
976 gfs2_remove_from_journal(bh, current->journal_info, 0);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100977 }
978 bh->b_bdev = NULL;
979 clear_buffer_mapped(bh);
980 clear_buffer_req(bh);
981 clear_buffer_new(bh);
982 gfs2_log_unlock(sdp);
983 unlock_buffer(bh);
984}
985
Lukas Czernerd47992f2013-05-21 23:17:23 -0400986static void gfs2_invalidatepage(struct page *page, unsigned int offset,
987 unsigned int length)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000988{
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100989 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
Lukas Czerner5c0bb972013-05-21 23:58:49 -0400990 unsigned int stop = offset + length;
991 int partial_page = (offset || length < PAGE_CACHE_SIZE);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100992 struct buffer_head *bh, *head;
993 unsigned long pos = 0;
994
David Teiglandb3b94fa2006-01-16 16:50:04 +0000995 BUG_ON(!PageLocked(page));
Lukas Czerner5c0bb972013-05-21 23:58:49 -0400996 if (!partial_page)
Robert Peterson8fb68592007-06-12 11:24:36 -0500997 ClearPageChecked(page);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100998 if (!page_has_buffers(page))
999 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001000
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001001 bh = head = page_buffers(page);
1002 do {
Lukas Czerner5c0bb972013-05-21 23:58:49 -04001003 if (pos + bh->b_size > stop)
1004 return;
1005
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001006 if (offset <= pos)
1007 gfs2_discard(sdp, bh);
1008 pos += bh->b_size;
1009 bh = bh->b_this_page;
1010 } while (bh != head);
1011out:
Lukas Czerner5c0bb972013-05-21 23:58:49 -04001012 if (!partial_page)
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001013 try_to_release_page(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001014}
1015
Steven Whitehousec7b33832006-12-14 18:24:26 +00001016/**
1017 * gfs2_ok_for_dio - check that dio is valid on this file
1018 * @ip: The inode
1019 * @rw: READ or WRITE
1020 * @offset: The offset at which we are reading or writing
1021 *
1022 * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
1023 * 1 (to accept the i/o request)
1024 */
1025static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset)
1026{
1027 /*
1028 * Should we return an error here? I can't see that O_DIRECT for
Steven Whitehouse55610932007-10-17 08:47:38 +01001029 * a stuffed file makes any sense. For now we'll silently fall
1030 * back to buffered I/O
Steven Whitehousec7b33832006-12-14 18:24:26 +00001031 */
Steven Whitehousec7b33832006-12-14 18:24:26 +00001032 if (gfs2_is_stuffed(ip))
1033 return 0;
1034
Bob Petersonacb57a32008-09-11 15:35:37 -04001035 if (offset >= i_size_read(&ip->i_inode))
Steven Whitehousec7b33832006-12-14 18:24:26 +00001036 return 0;
1037 return 1;
1038}
1039
1040
1041
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -04001042static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
Al Virod8d3d942014-03-04 21:27:34 -05001043 struct iov_iter *iter, loff_t offset)
Steven Whitehoused1665e42006-02-14 11:54:42 +00001044{
1045 struct file *file = iocb->ki_filp;
1046 struct inode *inode = file->f_mapping->host;
Steven Whitehousedfd11182013-12-18 14:14:52 +00001047 struct address_space *mapping = inode->i_mapping;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001048 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001049 struct gfs2_holder gh;
1050 int rv;
1051
1052 /*
Steven Whitehousec7b33832006-12-14 18:24:26 +00001053 * Deferred lock, even if its a write, since we do no allocation
1054 * on this path. All we need change is atime, and this lock mode
1055 * ensures that other nodes have flushed their buffered read caches
1056 * (i.e. their page cache entries for this inode). We do not,
1057 * unfortunately have the option of only flushing a range like
1058 * the VFS does.
Steven Whitehoused1665e42006-02-14 11:54:42 +00001059 */
Steven Whitehouse719ee342008-09-18 13:53:59 +01001060 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
1061 rv = gfs2_glock_nq(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001062 if (rv)
Steven Whitehousec7b33832006-12-14 18:24:26 +00001063 return rv;
1064 rv = gfs2_ok_for_dio(ip, rw, offset);
1065 if (rv != 1)
1066 goto out; /* dio not valid, fall back to buffered i/o */
Steven Whitehoused1665e42006-02-14 11:54:42 +00001067
Steven Whitehousedfd11182013-12-18 14:14:52 +00001068 /*
1069 * Now since we are holding a deferred (CW) lock at this point, you
1070 * might be wondering why this is ever needed. There is a case however
1071 * where we've granted a deferred local lock against a cached exclusive
1072 * glock. That is ok provided all granted local locks are deferred, but
1073 * it also means that it is possible to encounter pages which are
1074 * cached and possibly also mapped. So here we check for that and sort
1075 * them out ahead of the dio. The glock state machine will take care of
1076 * everything else.
1077 *
1078 * If in fact the cached glock state (gl->gl_state) is deferred (CW) in
1079 * the first place, mapping->nr_pages will always be zero.
1080 */
1081 if (mapping->nrpages) {
1082 loff_t lstart = offset & (PAGE_CACHE_SIZE - 1);
Al Viroa6cbcd42014-03-04 22:38:00 -05001083 loff_t len = iov_iter_count(iter);
Steven Whitehousedfd11182013-12-18 14:14:52 +00001084 loff_t end = PAGE_ALIGN(offset + len) - 1;
1085
1086 rv = 0;
1087 if (len == 0)
1088 goto out;
1089 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
1090 unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len);
1091 rv = filemap_write_and_wait_range(mapping, lstart, end);
1092 if (rv)
Steven Whitehouse086352f2014-01-14 13:46:51 +00001093 goto out;
1094 if (rw == WRITE)
1095 truncate_inode_pages_range(mapping, lstart, end);
Steven Whitehousedfd11182013-12-18 14:14:52 +00001096 }
1097
Al Virod8d3d942014-03-04 21:27:34 -05001098 rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
Al Viro31b14032014-03-05 01:33:16 -05001099 iter, offset,
Al Virod8d3d942014-03-04 21:27:34 -05001100 gfs2_get_block_direct, NULL, NULL, 0);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001101out:
Bob Peterson8e711e102012-08-09 12:48:42 -05001102 gfs2_glock_dq(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001103 gfs2_holder_uninit(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001104 return rv;
1105}
1106
1107/**
Steven Whitehouse623d9352006-08-31 12:14:44 -04001108 * gfs2_releasepage - free the metadata associated with a page
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001109 * @page: the page that's being released
1110 * @gfp_mask: passed from Linux VFS, ignored by us
1111 *
1112 * Call try_to_free_buffers() if the buffers in this page can be
1113 * released.
1114 *
1115 * Returns: 0
1116 */
1117
1118int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
1119{
Steven Whitehouse009d8512009-12-08 12:12:13 +00001120 struct address_space *mapping = page->mapping;
1121 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001122 struct buffer_head *bh, *head;
1123 struct gfs2_bufdata *bd;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001124
1125 if (!page_has_buffers(page))
Steven Whitehouse891ba6d2007-09-20 15:26:33 +01001126 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001127
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001128 gfs2_log_lock(sdp);
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001129 spin_lock(&sdp->sd_ail_lock);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001130 head = bh = page_buffers(page);
1131 do {
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001132 if (atomic_read(&bh->b_count))
1133 goto cannot_release;
1134 bd = bh->b_private;
Benjamin Marzinski16ca9412013-04-05 20:31:46 -05001135 if (bd && bd->bd_tr)
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001136 goto cannot_release;
Steven Whitehouse8f065d32011-05-03 11:49:19 +01001137 if (buffer_pinned(bh) || buffer_dirty(bh))
1138 goto not_possible;
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001139 bh = bh->b_this_page;
1140 } while(bh != head);
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001141 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001142
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001143 head = bh = page_buffers(page);
1144 do {
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001145 bd = bh->b_private;
1146 if (bd) {
1147 gfs2_assert_warn(sdp, bd->bd_bh == bh);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001148 if (!list_empty(&bd->bd_list))
1149 list_del_init(&bd->bd_list);
1150 bd->bd_bh = NULL;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001151 bh->b_private = NULL;
Steven Whitehouse623d9352006-08-31 12:14:44 -04001152 kmem_cache_free(gfs2_bufdata_cachep, bd);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001153 }
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001154
1155 bh = bh->b_this_page;
Steven Whitehouse166afcc2006-08-24 15:59:40 -04001156 } while (bh != head);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001157 gfs2_log_unlock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001158
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001159 return try_to_free_buffers(page);
Steven Whitehouse8f065d32011-05-03 11:49:19 +01001160
1161not_possible: /* Should never happen */
1162 WARN_ON(buffer_dirty(bh));
1163 WARN_ON(buffer_pinned(bh));
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001164cannot_release:
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001165 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001166 gfs2_log_unlock(sdp);
1167 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001168}
1169
Steven Whitehouse55610932007-10-17 08:47:38 +01001170static const struct address_space_operations gfs2_writeback_aops = {
Steven Whitehouse9d358142013-08-27 21:22:07 +01001171 .writepage = gfs2_writepage,
Steven Whitehouse45138992013-01-28 09:30:07 +00001172 .writepages = gfs2_writepages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001173 .readpage = gfs2_readpage,
1174 .readpages = gfs2_readpages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001175 .write_begin = gfs2_write_begin,
1176 .write_end = gfs2_write_end,
1177 .bmap = gfs2_bmap,
1178 .invalidatepage = gfs2_invalidatepage,
1179 .releasepage = gfs2_releasepage,
1180 .direct_IO = gfs2_direct_IO,
Steven Whitehousee5d9dc22008-01-03 11:31:38 +00001181 .migratepage = buffer_migrate_page,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001182 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001183 .error_remove_page = generic_error_remove_page,
Steven Whitehouse55610932007-10-17 08:47:38 +01001184};
1185
1186static const struct address_space_operations gfs2_ordered_aops = {
Steven Whitehouse9d358142013-08-27 21:22:07 +01001187 .writepage = gfs2_writepage,
Steven Whitehouse45138992013-01-28 09:30:07 +00001188 .writepages = gfs2_writepages,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001189 .readpage = gfs2_readpage,
Steven Whitehousefd88de562006-05-05 16:59:11 -04001190 .readpages = gfs2_readpages,
Steven Whitehouse7765ec22007-10-16 01:25:07 -07001191 .write_begin = gfs2_write_begin,
1192 .write_end = gfs2_write_end,
Robert Peterson8fb68592007-06-12 11:24:36 -05001193 .set_page_dirty = gfs2_set_page_dirty,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001194 .bmap = gfs2_bmap,
1195 .invalidatepage = gfs2_invalidatepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001196 .releasepage = gfs2_releasepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001197 .direct_IO = gfs2_direct_IO,
Steven Whitehousee5d9dc22008-01-03 11:31:38 +00001198 .migratepage = buffer_migrate_page,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001199 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001200 .error_remove_page = generic_error_remove_page,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001201};
1202
Steven Whitehouse55610932007-10-17 08:47:38 +01001203static const struct address_space_operations gfs2_jdata_aops = {
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +01001204 .writepage = gfs2_jdata_writepage,
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +01001205 .writepages = gfs2_jdata_writepages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001206 .readpage = gfs2_readpage,
1207 .readpages = gfs2_readpages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001208 .write_begin = gfs2_write_begin,
1209 .write_end = gfs2_write_end,
1210 .set_page_dirty = gfs2_set_page_dirty,
1211 .bmap = gfs2_bmap,
1212 .invalidatepage = gfs2_invalidatepage,
1213 .releasepage = gfs2_releasepage,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001214 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001215 .error_remove_page = generic_error_remove_page,
Steven Whitehouse55610932007-10-17 08:47:38 +01001216};
1217
1218void gfs2_set_aops(struct inode *inode)
1219{
1220 struct gfs2_inode *ip = GFS2_I(inode);
1221
1222 if (gfs2_is_writeback(ip))
1223 inode->i_mapping->a_ops = &gfs2_writeback_aops;
1224 else if (gfs2_is_ordered(ip))
1225 inode->i_mapping->a_ops = &gfs2_ordered_aops;
1226 else if (gfs2_is_jdata(ip))
1227 inode->i_mapping->a_ops = &gfs2_jdata_aops;
1228 else
1229 BUG();
1230}
1231