blob: 5a6f52ea272282b0c695372f11c8f8512c7ace12 [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>
Christoph Hellwige2e40f22015-02-22 08:58:50 -080023#include <linux/uio.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);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300104 pgoff_t end_index = i_size >> PAGE_SHIFT;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000105 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) */
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300112 offset = i_size & (PAGE_SIZE-1);
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100113 if (page->index > end_index || (page->index == end_index && !offset)) {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300114 page->mapping->a_ops->invalidatepage(page, 0, PAGE_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
Benjamin Marzinskifd4c5742016-06-27 10:01:06 -0500143/* This is the same as calling block_write_full_page, but it also
144 * writes pages outside of i_size
145 */
146int gfs2_write_full_page(struct page *page, get_block_t *get_block,
147 struct writeback_control *wbc)
148{
149 struct inode * const inode = page->mapping->host;
150 loff_t i_size = i_size_read(inode);
151 const pgoff_t end_index = i_size >> PAGE_SHIFT;
152 unsigned offset;
153
154 /*
155 * The page straddles i_size. It must be zeroed out on each and every
156 * writepage invocation because it may be mmapped. "A file is mapped
157 * in multiples of the page size. For a file that is not a multiple of
158 * the page size, the remaining memory is zeroed when mapped, and
159 * writes to that region are not written out to the file."
160 */
161 offset = i_size & (PAGE_SIZE-1);
162 if (page->index == end_index && offset)
163 zero_user_segment(page, offset, PAGE_SIZE);
164
165 return __block_write_full_page(inode, page, get_block, wbc,
166 end_buffer_async_write);
167}
168
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100169/**
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100170 * __gfs2_jdata_writepage - The core of jdata writepage
171 * @page: The page to write
172 * @wbc: The writeback control
173 *
174 * This is shared between writepage and writepages and implements the
175 * core of the writepage operation. If a transaction is required then
176 * PageChecked will have been set and the transaction will have
177 * already been started before this is called.
178 */
179
180static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
181{
182 struct inode *inode = page->mapping->host;
183 struct gfs2_inode *ip = GFS2_I(inode);
184 struct gfs2_sbd *sdp = GFS2_SB(inode);
185
186 if (PageChecked(page)) {
187 ClearPageChecked(page);
188 if (!page_has_buffers(page)) {
189 create_empty_buffers(page, inode->i_sb->s_blocksize,
Fabian Frederick47a9a522016-08-02 12:05:27 -0500190 BIT(BH_Dirty)|BIT(BH_Uptodate));
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100191 }
192 gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
193 }
Benjamin Marzinskifd4c5742016-06-27 10:01:06 -0500194 return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100195}
196
197/**
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100198 * gfs2_jdata_writepage - Write complete page
199 * @page: Page to write
Fabian Frederick12725742015-05-05 13:29:54 -0500200 * @wbc: The writeback control
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100201 *
202 * Returns: errno
203 *
204 */
205
206static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
207{
208 struct inode *inode = page->mapping->host;
Benjamin Marzinskifd4c5742016-06-27 10:01:06 -0500209 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100210 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100211 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000212
Benjamin Marzinskifd4c5742016-06-27 10:01:06 -0500213 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
214 goto out;
215 if (PageChecked(page) || current->journal_info)
216 goto out_ignore;
217 ret = __gfs2_jdata_writepage(page, wbc);
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100218 return ret;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000219
220out_ignore:
221 redirty_page_for_writepage(wbc, page);
Benjamin Marzinskifd4c5742016-06-27 10:01:06 -0500222out:
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000223 unlock_page(page);
224 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000225}
226
227/**
Steven Whitehouse45138992013-01-28 09:30:07 +0000228 * gfs2_writepages - Write a bunch of dirty pages back to disk
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000229 * @mapping: The mapping to write
230 * @wbc: Write-back control
231 *
Steven Whitehouse45138992013-01-28 09:30:07 +0000232 * Used for both ordered and writeback modes.
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000233 */
Steven Whitehouse45138992013-01-28 09:30:07 +0000234static int gfs2_writepages(struct address_space *mapping,
235 struct writeback_control *wbc)
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000236{
Steven Whitehouse55610932007-10-17 08:47:38 +0100237 return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000238}
239
240/**
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100241 * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages
242 * @mapping: The mapping
243 * @wbc: The writeback control
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100244 * @pvec: The vector of pages
245 * @nr_pages: The number of pages to write
Fabian Frederick12725742015-05-05 13:29:54 -0500246 * @end: End position
247 * @done_index: Page index
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100248 *
249 * Returns: non-zero if loop should terminate, zero otherwise
250 */
251
252static int gfs2_write_jdata_pagevec(struct address_space *mapping,
253 struct writeback_control *wbc,
254 struct pagevec *pvec,
Steven Whitehouse774016b2014-02-06 15:47:47 +0000255 int nr_pages, pgoff_t end,
256 pgoff_t *done_index)
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100257{
258 struct inode *inode = mapping->host;
259 struct gfs2_sbd *sdp = GFS2_SB(inode);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300260 unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100261 int i;
262 int ret;
263
Abhijith Das20b95bf2008-03-06 17:43:52 -0600264 ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100265 if (ret < 0)
266 return ret;
267
268 for(i = 0; i < nr_pages; i++) {
269 struct page *page = pvec->pages[i];
270
Steven Whitehouse774016b2014-02-06 15:47:47 +0000271 /*
272 * At this point, the page may be truncated or
273 * invalidated (changing page->mapping to NULL), or
274 * even swizzled back from swapper_space to tmpfs file
275 * mapping. However, page->index will not change
276 * because we have a reference on the page.
277 */
278 if (page->index > end) {
279 /*
280 * can't be range_cyclic (1st pass) because
281 * end == -1 in that case.
282 */
283 ret = 1;
284 break;
285 }
286
287 *done_index = page->index;
288
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100289 lock_page(page);
290
291 if (unlikely(page->mapping != mapping)) {
Steven Whitehouse774016b2014-02-06 15:47:47 +0000292continue_unlock:
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100293 unlock_page(page);
294 continue;
295 }
296
Steven Whitehouse774016b2014-02-06 15:47:47 +0000297 if (!PageDirty(page)) {
298 /* someone wrote it for us */
299 goto continue_unlock;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100300 }
301
Steven Whitehouse774016b2014-02-06 15:47:47 +0000302 if (PageWriteback(page)) {
303 if (wbc->sync_mode != WB_SYNC_NONE)
304 wait_on_page_writeback(page);
305 else
306 goto continue_unlock;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100307 }
308
Steven Whitehouse774016b2014-02-06 15:47:47 +0000309 BUG_ON(PageWriteback(page));
310 if (!clear_page_dirty_for_io(page))
311 goto continue_unlock;
312
Christoph Hellwigde1414a2015-01-14 10:42:36 +0100313 trace_wbc_writepage(wbc, inode_to_bdi(inode));
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100314
315 ret = __gfs2_jdata_writepage(page, wbc);
Steven Whitehouse774016b2014-02-06 15:47:47 +0000316 if (unlikely(ret)) {
317 if (ret == AOP_WRITEPAGE_ACTIVATE) {
318 unlock_page(page);
319 ret = 0;
320 } else {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100321
Steven Whitehouse774016b2014-02-06 15:47:47 +0000322 /*
323 * done_index is set past this page,
324 * so media errors will not choke
325 * background writeout for the entire
326 * file. This has consequences for
327 * range_cyclic semantics (ie. it may
328 * not be suitable for data integrity
329 * writeout).
330 */
331 *done_index = page->index + 1;
332 ret = 1;
333 break;
334 }
335 }
336
337 /*
338 * We stop writing back only if we are not doing
339 * integrity sync. In case of integrity sync we have to
340 * keep going until we have written all the pages
341 * we tagged for writeback prior to entering this loop.
342 */
343 if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100344 ret = 1;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000345 break;
346 }
347
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100348 }
349 gfs2_trans_end(sdp);
350 return ret;
351}
352
353/**
354 * gfs2_write_cache_jdata - Like write_cache_pages but different
355 * @mapping: The mapping to write
356 * @wbc: The writeback control
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100357 *
358 * The reason that we use our own function here is that we need to
359 * start transactions before we grab page locks. This allows us
360 * to get the ordering right.
361 */
362
363static int gfs2_write_cache_jdata(struct address_space *mapping,
364 struct writeback_control *wbc)
365{
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100366 int ret = 0;
367 int done = 0;
368 struct pagevec pvec;
369 int nr_pages;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000370 pgoff_t uninitialized_var(writeback_index);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100371 pgoff_t index;
372 pgoff_t end;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000373 pgoff_t done_index;
374 int cycled;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100375 int range_whole = 0;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000376 int tag;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100377
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100378 pagevec_init(&pvec, 0);
379 if (wbc->range_cyclic) {
Steven Whitehouse774016b2014-02-06 15:47:47 +0000380 writeback_index = mapping->writeback_index; /* prev offset */
381 index = writeback_index;
382 if (index == 0)
383 cycled = 1;
384 else
385 cycled = 0;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100386 end = -1;
387 } else {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300388 index = wbc->range_start >> PAGE_SHIFT;
389 end = wbc->range_end >> PAGE_SHIFT;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100390 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
391 range_whole = 1;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000392 cycled = 1; /* ignore range_cyclic tests */
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100393 }
Steven Whitehouse774016b2014-02-06 15:47:47 +0000394 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
395 tag = PAGECACHE_TAG_TOWRITE;
396 else
397 tag = PAGECACHE_TAG_DIRTY;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100398
399retry:
Steven Whitehouse774016b2014-02-06 15:47:47 +0000400 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
401 tag_pages_for_writeback(mapping, index, end);
402 done_index = index;
403 while (!done && (index <= end)) {
404 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
405 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
406 if (nr_pages == 0)
407 break;
408
409 ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end, &done_index);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100410 if (ret)
411 done = 1;
412 if (ret > 0)
413 ret = 0;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100414 pagevec_release(&pvec);
415 cond_resched();
416 }
417
Steven Whitehouse774016b2014-02-06 15:47:47 +0000418 if (!cycled && !done) {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100419 /*
Steven Whitehouse774016b2014-02-06 15:47:47 +0000420 * range_cyclic:
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100421 * We hit the last page and there is more work to be done: wrap
422 * back to the start of the file
423 */
Steven Whitehouse774016b2014-02-06 15:47:47 +0000424 cycled = 1;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100425 index = 0;
Steven Whitehouse774016b2014-02-06 15:47:47 +0000426 end = writeback_index - 1;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100427 goto retry;
428 }
429
430 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
Steven Whitehouse774016b2014-02-06 15:47:47 +0000431 mapping->writeback_index = done_index;
432
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100433 return ret;
434}
435
436
437/**
438 * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
439 * @mapping: The mapping to write
440 * @wbc: The writeback control
441 *
442 */
443
444static int gfs2_jdata_writepages(struct address_space *mapping,
445 struct writeback_control *wbc)
446{
447 struct gfs2_inode *ip = GFS2_I(mapping->host);
448 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
449 int ret;
450
451 ret = gfs2_write_cache_jdata(mapping, wbc);
452 if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
Benjamin Marzinski24972552014-05-01 22:26:55 -0500453 gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100454 ret = gfs2_write_cache_jdata(mapping, wbc);
455 }
456 return ret;
457}
458
459/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000460 * stuffed_readpage - Fill in a Linux page with stuffed file data
461 * @ip: the inode
462 * @page: the page
463 *
464 * Returns: errno
465 */
466
467static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
468{
469 struct buffer_head *dibh;
Steven Whitehouse602c89d2010-03-25 14:32:43 +0000470 u64 dsize = i_size_read(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000471 void *kaddr;
472 int error;
473
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100474 /*
Nick Piggin3c18ddd2008-04-28 02:12:10 -0700475 * Due to the order of unstuffing files and ->fault(), we can be
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100476 * asked for a zero page in the case of a stuffed file being extended,
477 * so we need to supply one here. It doesn't happen often.
478 */
479 if (unlikely(page->index)) {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300480 zero_user(page, 0, PAGE_SIZE);
Abhijith Das0a7ab792009-01-07 16:03:37 -0600481 SetPageUptodate(page);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100482 return 0;
483 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400484
David Teiglandb3b94fa2006-01-16 16:50:04 +0000485 error = gfs2_meta_inode_buffer(ip, &dibh);
486 if (error)
487 return error;
488
Cong Wangd9349282011-11-25 23:14:30 +0800489 kaddr = kmap_atomic(page);
Steven Whitehouse602c89d2010-03-25 14:32:43 +0000490 if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
491 dsize = (dibh->b_size - sizeof(struct gfs2_dinode));
492 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300493 memset(kaddr + dsize, 0, PAGE_SIZE - dsize);
Cong Wangd9349282011-11-25 23:14:30 +0800494 kunmap_atomic(kaddr);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100495 flush_dcache_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000496 brelse(dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000497 SetPageUptodate(page);
498
499 return 0;
500}
501
David Teiglandb3b94fa2006-01-16 16:50:04 +0000502
503/**
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100504 * __gfs2_readpage - readpage
505 * @file: The file to read a page for
David Teiglandb3b94fa2006-01-16 16:50:04 +0000506 * @page: The page to read
507 *
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100508 * This is the core of gfs2's readpage. Its used by the internal file
509 * reading code as in that case we already hold the glock. Also its
510 * called by gfs2_readpage() once the required lock has been granted.
511 *
512 */
513
514static int __gfs2_readpage(void *file, struct page *page)
515{
516 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
517 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
518 int error;
519
520 if (gfs2_is_stuffed(ip)) {
521 error = stuffed_readpage(ip, page);
522 unlock_page(page);
523 } else {
Bob Petersone9e1ef22007-12-10 14:13:27 -0600524 error = mpage_readpage(page, gfs2_block_map);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100525 }
526
527 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
528 return -EIO;
529
530 return error;
531}
532
533/**
534 * gfs2_readpage - read a page of a file
535 * @file: The file to read
536 * @page: The page of the file
537 *
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100538 * This deals with the locking required. We have to unlock and
539 * relock the page in order to get the locking in the right
540 * order.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000541 */
542
543static int gfs2_readpage(struct file *file, struct page *page)
544{
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100545 struct address_space *mapping = page->mapping;
546 struct gfs2_inode *ip = GFS2_I(mapping->host);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100547 struct gfs2_holder gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000548 int error;
549
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100550 unlock_page(page);
Steven Whitehouse719ee342008-09-18 13:53:59 +0100551 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
552 error = gfs2_glock_nq(&gh);
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100553 if (unlikely(error))
Steven Whitehouse6802e342008-05-21 17:03:22 +0100554 goto out;
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100555 error = AOP_TRUNCATED_PAGE;
556 lock_page(page);
557 if (page->mapping == mapping && !PageUptodate(page))
558 error = __gfs2_readpage(file, page);
559 else
560 unlock_page(page);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100561 gfs2_glock_dq(&gh);
Steven Whitehouse7afd88d2008-02-22 16:07:18 +0000562out:
Steven Whitehouse6802e342008-05-21 17:03:22 +0100563 gfs2_holder_uninit(&gh);
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100564 if (error && error != AOP_TRUNCATED_PAGE)
565 lock_page(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100566 return error;
567}
568
569/**
570 * gfs2_internal_read - read an internal file
571 * @ip: The gfs2 inode
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100572 * @buf: The buffer to fill
573 * @pos: The file position
574 * @size: The amount to read
575 *
576 */
577
Andrew Price43066292012-04-16 16:40:55 +0100578int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
579 unsigned size)
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100580{
581 struct address_space *mapping = ip->i_inode.i_mapping;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300582 unsigned long index = *pos / PAGE_SIZE;
583 unsigned offset = *pos & (PAGE_SIZE - 1);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100584 unsigned copied = 0;
585 unsigned amt;
586 struct page *page;
587 void *p;
588
589 do {
590 amt = size - copied;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300591 if (offset + size > PAGE_SIZE)
592 amt = PAGE_SIZE - offset;
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100593 page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
594 if (IS_ERR(page))
595 return PTR_ERR(page);
Cong Wangd9349282011-11-25 23:14:30 +0800596 p = kmap_atomic(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100597 memcpy(buf + copied, p + offset, amt);
Cong Wangd9349282011-11-25 23:14:30 +0800598 kunmap_atomic(p);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300599 put_page(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100600 copied += amt;
601 index++;
602 offset = 0;
603 } while(copied < size);
604 (*pos) += size;
605 return size;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400606}
607
Steven Whitehousefd88de562006-05-05 16:59:11 -0400608/**
609 * gfs2_readpages - Read a bunch of pages at once
Fabian Frederick12725742015-05-05 13:29:54 -0500610 * @file: The file to read from
611 * @mapping: Address space info
612 * @pages: List of pages to read
613 * @nr_pages: Number of pages to read
Steven Whitehousefd88de562006-05-05 16:59:11 -0400614 *
615 * Some notes:
616 * 1. This is only for readahead, so we can simply ignore any things
617 * which are slightly inconvenient (such as locking conflicts between
618 * the page lock and the glock) and return having done no I/O. Its
619 * obviously not something we'd want to do on too regular a basis.
620 * Any I/O we ignore at this time will be done via readpage later.
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500621 * 2. We don't handle stuffed files here we let readpage do the honours.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400622 * 3. mpage_readpages() does most of the heavy lifting in the common case.
Bob Petersone9e1ef22007-12-10 14:13:27 -0600623 * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400624 */
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100625
Steven Whitehousefd88de562006-05-05 16:59:11 -0400626static int gfs2_readpages(struct file *file, struct address_space *mapping,
627 struct list_head *pages, unsigned nr_pages)
628{
629 struct inode *inode = mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400630 struct gfs2_inode *ip = GFS2_I(inode);
631 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400632 struct gfs2_holder gh;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100633 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400634
Steven Whitehouse719ee342008-09-18 13:53:59 +0100635 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
636 ret = gfs2_glock_nq(&gh);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100637 if (unlikely(ret))
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100638 goto out_uninit;
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500639 if (!gfs2_is_stuffed(ip))
Bob Petersone9e1ef22007-12-10 14:13:27 -0600640 ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100641 gfs2_glock_dq(&gh);
642out_uninit:
643 gfs2_holder_uninit(&gh);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400644 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
645 ret = -EIO;
646 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000647}
648
649/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700650 * gfs2_write_begin - Begin to write to a file
David Teiglandb3b94fa2006-01-16 16:50:04 +0000651 * @file: The file to write to
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700652 * @mapping: The mapping in which to write
653 * @pos: The file offset at which to start writing
654 * @len: Length of the write
655 * @flags: Various flags
656 * @pagep: Pointer to return the page
657 * @fsdata: Pointer to return fs data (unused by GFS2)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000658 *
659 * Returns: errno
660 */
661
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700662static int gfs2_write_begin(struct file *file, struct address_space *mapping,
663 loff_t pos, unsigned len, unsigned flags,
664 struct page **pagep, void **fsdata)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000665{
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700666 struct gfs2_inode *ip = GFS2_I(mapping->host);
667 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500668 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000669 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100670 unsigned requested = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000671 int alloc_required;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000672 int error = 0;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300673 pgoff_t index = pos >> PAGE_SHIFT;
674 unsigned from = pos & (PAGE_SIZE - 1);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700675 struct page *page;
Russell Cattelan52ae7b72006-10-09 12:11:54 -0500676
Steven Whitehouse719ee342008-09-18 13:53:59 +0100677 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
678 error = gfs2_glock_nq(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700679 if (unlikely(error))
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000680 goto out_uninit;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500681 if (&ip->i_inode == sdp->sd_rindex) {
682 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
683 GL_NOCACHE, &m_ip->i_gh);
684 if (unlikely(error)) {
685 gfs2_glock_dq(&ip->i_gh);
686 goto out_uninit;
687 }
688 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000689
Bob Peterson461cb412010-06-24 19:21:20 -0400690 alloc_required = gfs2_write_alloc_required(ip, pos, len);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000691
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000692 if (alloc_required || gfs2_is_jdata(ip))
693 gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
694
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000695 if (alloc_required) {
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100696 struct gfs2_alloc_parms ap = { .aflags = 0, };
Abhi Dasb8fbf472015-03-18 12:03:41 -0500697 requested = data_blocks + ind_blocks;
698 ap.target = requested;
699 error = gfs2_quota_lock_check(ip, &ap);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000700 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -0400701 goto out_unlock;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000702
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100703 error = gfs2_inplace_reserve(ip, &ap);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000704 if (error)
705 goto out_qunlock;
706 }
707
708 rblocks = RES_DINODE + ind_blocks;
709 if (gfs2_is_jdata(ip))
710 rblocks += data_blocks ? data_blocks : 1;
711 if (ind_blocks || data_blocks)
712 rblocks += RES_STATFS + RES_QUOTA;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500713 if (&ip->i_inode == sdp->sd_rindex)
714 rblocks += 2 * RES_STATFS;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500715 if (alloc_required)
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100716 rblocks += gfs2_rg_blocks(ip, requested);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000717
Steven Whitehouse16615be2007-09-17 10:59:52 +0100718 error = gfs2_trans_begin(sdp, rblocks,
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300719 PAGE_SIZE/sdp->sd_sb.sb_bsize);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000720 if (error)
Steven Whitehousea867bb22007-07-17 10:29:02 +0100721 goto out_trans_fail;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000722
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100723 error = -ENOMEM;
Steven Whitehousee4fefba2009-01-06 10:08:33 +0000724 flags |= AOP_FLAG_NOFS;
Nick Piggin54566b22009-01-04 12:00:53 -0800725 page = grab_cache_page_write_begin(mapping, index, flags);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100726 *pagep = page;
727 if (unlikely(!page))
728 goto out_endtrans;
729
David Teiglandb3b94fa2006-01-16 16:50:04 +0000730 if (gfs2_is_stuffed(ip)) {
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100731 error = 0;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700732 if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400733 error = gfs2_unstuff_dinode(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000734 if (error == 0)
735 goto prepare_write;
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100736 } else if (!PageUptodate(page)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000737 error = stuffed_readpage(ip, page);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100738 }
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000739 goto out;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000740 }
741
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000742prepare_write:
Christoph Hellwigebdec242010-10-06 10:47:23 +0200743 error = __block_write_begin(page, from, len, gfs2_block_map);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000744out:
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100745 if (error == 0)
746 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000747
Maxim6c474f72011-03-14 13:19:21 +0000748 unlock_page(page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300749 put_page(page);
npiggin@suse.de15c6fd92010-05-27 01:05:34 +1000750
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100751 gfs2_trans_end(sdp);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100752 if (pos + len > ip->i_inode.i_size)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100753 gfs2_trim_blocks(&ip->i_inode);
754 goto out_trans_fail;
755
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100756out_endtrans:
757 gfs2_trans_end(sdp);
758out_trans_fail:
759 if (alloc_required) {
760 gfs2_inplace_release(ip);
761out_qunlock:
762 gfs2_quota_unlock(ip);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100763 }
764out_unlock:
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500765 if (&ip->i_inode == sdp->sd_rindex) {
766 gfs2_glock_dq(&m_ip->i_gh);
767 gfs2_holder_uninit(&m_ip->i_gh);
768 }
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100769 gfs2_glock_dq(&ip->i_gh);
770out_uninit:
771 gfs2_holder_uninit(&ip->i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000772 return error;
773}
774
775/**
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500776 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
777 * @inode: the rindex inode
778 */
779static void adjust_fs_space(struct inode *inode)
780{
781 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500782 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
783 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500784 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
785 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500786 struct buffer_head *m_bh, *l_bh;
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500787 u64 fs_total, new_free;
788
789 /* Total up the file system space, according to the latest rindex. */
790 fs_total = gfs2_ri_total(sdp);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500791 if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
792 return;
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500793
794 spin_lock(&sdp->sd_statfs_spin);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500795 gfs2_statfs_change_in(m_sc, m_bh->b_data +
796 sizeof(struct gfs2_dinode));
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500797 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
798 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
799 else
800 new_free = 0;
801 spin_unlock(&sdp->sd_statfs_spin);
Robert Peterson6c532672007-05-10 16:54:38 -0500802 fs_warn(sdp, "File system extended by %llu blocks.\n",
803 (unsigned long long)new_free);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500804 gfs2_statfs_change(sdp, new_free, new_free, 0);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500805
806 if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0)
807 goto out;
808 update_statfs(sdp, m_bh, l_bh);
809 brelse(l_bh);
810out:
811 brelse(m_bh);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500812}
813
814/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700815 * gfs2_stuffed_write_end - Write end for stuffed files
816 * @inode: The inode
817 * @dibh: The buffer_head containing the on-disk inode
818 * @pos: The file position
819 * @len: The length of the write
820 * @copied: How much was actually copied by the VFS
821 * @page: The page
822 *
823 * This copies the data from the page into the inode block after
824 * the inode data structure itself.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000825 *
826 * Returns: errno
827 */
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700828static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
829 loff_t pos, unsigned len, unsigned copied,
830 struct page *page)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000831{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400832 struct gfs2_inode *ip = GFS2_I(inode);
833 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500834 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700835 u64 to = pos + copied;
836 void *kaddr;
837 unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000838
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700839 BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode)));
Cong Wangd9349282011-11-25 23:14:30 +0800840 kaddr = kmap_atomic(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700841 memcpy(buf + pos, kaddr + pos, copied);
842 memset(kaddr + pos + copied, 0, len - copied);
843 flush_dcache_page(page);
Cong Wangd9349282011-11-25 23:14:30 +0800844 kunmap_atomic(kaddr);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000845
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700846 if (!PageUptodate(page))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000847 SetPageUptodate(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700848 unlock_page(page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300849 put_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000850
Abhijith Das7537d81a2009-05-12 11:16:20 -0500851 if (copied) {
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100852 if (inode->i_size < to)
Abhijith Das7537d81a2009-05-12 11:16:20 -0500853 i_size_write(inode, to);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700854 mark_inode_dirty(inode);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400855 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000856
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600857 if (inode == sdp->sd_rindex) {
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500858 adjust_fs_space(inode);
Bob Petersonca9248d2012-04-10 08:56:04 -0400859 sdp->sd_rindex_uptodate = 0;
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600860 }
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500861
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000862 brelse(dibh);
863 gfs2_trans_end(sdp);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500864 if (inode == sdp->sd_rindex) {
865 gfs2_glock_dq(&m_ip->i_gh);
866 gfs2_holder_uninit(&m_ip->i_gh);
867 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700868 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000869 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700870 return copied;
871}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000872
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700873/**
874 * gfs2_write_end
875 * @file: The file to write to
876 * @mapping: The address space to write to
877 * @pos: The file position
878 * @len: The length of the data
Fabian Frederick12725742015-05-05 13:29:54 -0500879 * @copied: How much was actually copied by the VFS
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700880 * @page: The page that has been written
881 * @fsdata: The fsdata (unused in GFS2)
882 *
883 * The main write_end function for GFS2. We have a separate one for
884 * stuffed files as they are slightly different, otherwise we just
885 * put our locking around the VFS provided functions.
886 *
887 * Returns: errno
888 */
889
890static int gfs2_write_end(struct file *file, struct address_space *mapping,
891 loff_t pos, unsigned len, unsigned copied,
892 struct page *page, void *fsdata)
893{
894 struct inode *inode = page->mapping->host;
895 struct gfs2_inode *ip = GFS2_I(inode);
896 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500897 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700898 struct buffer_head *dibh;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300899 unsigned int from = pos & (PAGE_SIZE - 1);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700900 unsigned int to = from + len;
901 int ret;
Benjamin Marzinski0c901802013-09-03 16:59:42 -0500902 struct gfs2_trans *tr = current->journal_info;
903 BUG_ON(!tr);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700904
Steven Whitehouse7afd88d2008-02-22 16:07:18 +0000905 BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700906
907 ret = gfs2_meta_inode_buffer(ip, &dibh);
908 if (unlikely(ret)) {
909 unlock_page(page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300910 put_page(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700911 goto failed;
912 }
913
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700914 if (gfs2_is_stuffed(ip))
915 return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
916
Steven Whitehousebf36a712007-10-17 08:35:19 +0100917 if (!gfs2_is_writeback(ip))
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700918 gfs2_page_add_databufs(ip, page, from, to);
919
920 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
Benjamin Marzinski0c901802013-09-03 16:59:42 -0500921 if (tr->tr_num_buf_new)
922 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
923 else
924 gfs2_trans_add_meta(ip->i_gl, dibh);
925
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700926
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600927 if (inode == sdp->sd_rindex) {
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700928 adjust_fs_space(inode);
Bob Petersonca9248d2012-04-10 08:56:04 -0400929 sdp->sd_rindex_uptodate = 0;
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600930 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700931
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000932 brelse(dibh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700933failed:
Bob Petersondeab72d2011-03-16 16:32:39 -0400934 gfs2_trans_end(sdp);
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100935 gfs2_inplace_release(ip);
Bob Petersonb54e9a02015-10-26 10:40:28 -0500936 if (ip->i_qadata && ip->i_qadata->qa_qd_num)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000937 gfs2_quota_unlock(ip);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500938 if (inode == sdp->sd_rindex) {
939 gfs2_glock_dq(&m_ip->i_gh);
940 gfs2_holder_uninit(&m_ip->i_gh);
941 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700942 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000943 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700944 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000945}
946
947/**
Robert Peterson8fb68592007-06-12 11:24:36 -0500948 * gfs2_set_page_dirty - Page dirtying function
949 * @page: The page to dirty
950 *
951 * Returns: 1 if it dirtyed the page, or 0 otherwise
952 */
953
954static int gfs2_set_page_dirty(struct page *page)
955{
Steven Whitehouse55610932007-10-17 08:47:38 +0100956 SetPageChecked(page);
Robert Peterson8fb68592007-06-12 11:24:36 -0500957 return __set_page_dirty_buffers(page);
958}
959
960/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000961 * gfs2_bmap - Block map function
962 * @mapping: Address space info
963 * @lblock: The block to map
964 *
965 * Returns: The disk address for the block or 0 on hole or error
966 */
967
968static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
969{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400970 struct gfs2_inode *ip = GFS2_I(mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000971 struct gfs2_holder i_gh;
972 sector_t dblock = 0;
973 int error;
974
David Teiglandb3b94fa2006-01-16 16:50:04 +0000975 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
976 if (error)
977 return 0;
978
979 if (!gfs2_is_stuffed(ip))
Bob Petersone9e1ef22007-12-10 14:13:27 -0600980 dblock = generic_block_bmap(mapping, lblock, gfs2_block_map);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000981
982 gfs2_glock_dq_uninit(&i_gh);
983
984 return dblock;
985}
986
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100987static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
988{
989 struct gfs2_bufdata *bd;
990
991 lock_buffer(bh);
992 gfs2_log_lock(sdp);
993 clear_buffer_dirty(bh);
994 bd = bh->b_private;
995 if (bd) {
Bob Petersonc0752aa2012-05-01 12:00:34 -0400996 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
997 list_del_init(&bd->bd_list);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100998 else
Bob Peterson68cd4ce2016-05-02 11:53:35 -0500999 gfs2_remove_from_journal(bh, REMOVE_JDATA);
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001000 }
1001 bh->b_bdev = NULL;
1002 clear_buffer_mapped(bh);
1003 clear_buffer_req(bh);
1004 clear_buffer_new(bh);
1005 gfs2_log_unlock(sdp);
1006 unlock_buffer(bh);
1007}
1008
Lukas Czernerd47992f2013-05-21 23:17:23 -04001009static void gfs2_invalidatepage(struct page *page, unsigned int offset,
1010 unsigned int length)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001011{
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001012 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
Lukas Czerner5c0bb972013-05-21 23:58:49 -04001013 unsigned int stop = offset + length;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001014 int partial_page = (offset || length < PAGE_SIZE);
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001015 struct buffer_head *bh, *head;
1016 unsigned long pos = 0;
1017
David Teiglandb3b94fa2006-01-16 16:50:04 +00001018 BUG_ON(!PageLocked(page));
Lukas Czerner5c0bb972013-05-21 23:58:49 -04001019 if (!partial_page)
Robert Peterson8fb68592007-06-12 11:24:36 -05001020 ClearPageChecked(page);
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001021 if (!page_has_buffers(page))
1022 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001023
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001024 bh = head = page_buffers(page);
1025 do {
Lukas Czerner5c0bb972013-05-21 23:58:49 -04001026 if (pos + bh->b_size > stop)
1027 return;
1028
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001029 if (offset <= pos)
1030 gfs2_discard(sdp, bh);
1031 pos += bh->b_size;
1032 bh = bh->b_this_page;
1033 } while (bh != head);
1034out:
Lukas Czerner5c0bb972013-05-21 23:58:49 -04001035 if (!partial_page)
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001036 try_to_release_page(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001037}
1038
Steven Whitehousec7b33832006-12-14 18:24:26 +00001039/**
1040 * gfs2_ok_for_dio - check that dio is valid on this file
1041 * @ip: The inode
Steven Whitehousec7b33832006-12-14 18:24:26 +00001042 * @offset: The offset at which we are reading or writing
1043 *
1044 * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
1045 * 1 (to accept the i/o request)
1046 */
Omar Sandoval6f673762015-03-16 04:33:52 -07001047static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset)
Steven Whitehousec7b33832006-12-14 18:24:26 +00001048{
1049 /*
1050 * Should we return an error here? I can't see that O_DIRECT for
Steven Whitehouse55610932007-10-17 08:47:38 +01001051 * a stuffed file makes any sense. For now we'll silently fall
1052 * back to buffered I/O
Steven Whitehousec7b33832006-12-14 18:24:26 +00001053 */
Steven Whitehousec7b33832006-12-14 18:24:26 +00001054 if (gfs2_is_stuffed(ip))
1055 return 0;
1056
Bob Petersonacb57a32008-09-11 15:35:37 -04001057 if (offset >= i_size_read(&ip->i_inode))
Steven Whitehousec7b33832006-12-14 18:24:26 +00001058 return 0;
1059 return 1;
1060}
1061
1062
1063
Christoph Hellwigc8b8e322016-04-07 08:51:58 -07001064static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
Steven Whitehoused1665e42006-02-14 11:54:42 +00001065{
1066 struct file *file = iocb->ki_filp;
1067 struct inode *inode = file->f_mapping->host;
Steven Whitehousedfd11182013-12-18 14:14:52 +00001068 struct address_space *mapping = inode->i_mapping;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001069 struct gfs2_inode *ip = GFS2_I(inode);
Christoph Hellwigc8b8e322016-04-07 08:51:58 -07001070 loff_t offset = iocb->ki_pos;
Steven Whitehoused1665e42006-02-14 11:54:42 +00001071 struct gfs2_holder gh;
1072 int rv;
1073
1074 /*
Steven Whitehousec7b33832006-12-14 18:24:26 +00001075 * Deferred lock, even if its a write, since we do no allocation
1076 * on this path. All we need change is atime, and this lock mode
1077 * ensures that other nodes have flushed their buffered read caches
1078 * (i.e. their page cache entries for this inode). We do not,
1079 * unfortunately have the option of only flushing a range like
1080 * the VFS does.
Steven Whitehoused1665e42006-02-14 11:54:42 +00001081 */
Steven Whitehouse719ee342008-09-18 13:53:59 +01001082 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
1083 rv = gfs2_glock_nq(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001084 if (rv)
Daniel DeFreez9c7fe832016-04-19 19:57:45 -04001085 goto out_uninit;
Omar Sandoval6f673762015-03-16 04:33:52 -07001086 rv = gfs2_ok_for_dio(ip, offset);
Steven Whitehousec7b33832006-12-14 18:24:26 +00001087 if (rv != 1)
1088 goto out; /* dio not valid, fall back to buffered i/o */
Steven Whitehoused1665e42006-02-14 11:54:42 +00001089
Steven Whitehousedfd11182013-12-18 14:14:52 +00001090 /*
1091 * Now since we are holding a deferred (CW) lock at this point, you
1092 * might be wondering why this is ever needed. There is a case however
1093 * where we've granted a deferred local lock against a cached exclusive
1094 * glock. That is ok provided all granted local locks are deferred, but
1095 * it also means that it is possible to encounter pages which are
1096 * cached and possibly also mapped. So here we check for that and sort
1097 * them out ahead of the dio. The glock state machine will take care of
1098 * everything else.
1099 *
1100 * If in fact the cached glock state (gl->gl_state) is deferred (CW) in
1101 * the first place, mapping->nr_pages will always be zero.
1102 */
1103 if (mapping->nrpages) {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001104 loff_t lstart = offset & ~(PAGE_SIZE - 1);
Al Viroa6cbcd42014-03-04 22:38:00 -05001105 loff_t len = iov_iter_count(iter);
Steven Whitehousedfd11182013-12-18 14:14:52 +00001106 loff_t end = PAGE_ALIGN(offset + len) - 1;
1107
1108 rv = 0;
1109 if (len == 0)
1110 goto out;
1111 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
1112 unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len);
1113 rv = filemap_write_and_wait_range(mapping, lstart, end);
1114 if (rv)
Steven Whitehouse086352f2014-01-14 13:46:51 +00001115 goto out;
Omar Sandoval6f673762015-03-16 04:33:52 -07001116 if (iov_iter_rw(iter) == WRITE)
Steven Whitehouse086352f2014-01-14 13:46:51 +00001117 truncate_inode_pages_range(mapping, lstart, end);
Steven Whitehousedfd11182013-12-18 14:14:52 +00001118 }
1119
Omar Sandoval17f8c842015-03-16 04:33:50 -07001120 rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
Christoph Hellwigc8b8e322016-04-07 08:51:58 -07001121 gfs2_get_block_direct, NULL, NULL, 0);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001122out:
Bob Peterson8e711e102012-08-09 12:48:42 -05001123 gfs2_glock_dq(&gh);
Daniel DeFreez9c7fe832016-04-19 19:57:45 -04001124out_uninit:
Steven Whitehoused1665e42006-02-14 11:54:42 +00001125 gfs2_holder_uninit(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001126 return rv;
1127}
1128
1129/**
Steven Whitehouse623d9352006-08-31 12:14:44 -04001130 * gfs2_releasepage - free the metadata associated with a page
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001131 * @page: the page that's being released
1132 * @gfp_mask: passed from Linux VFS, ignored by us
1133 *
1134 * Call try_to_free_buffers() if the buffers in this page can be
1135 * released.
1136 *
1137 * Returns: 0
1138 */
1139
1140int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
1141{
Steven Whitehouse009d8512009-12-08 12:12:13 +00001142 struct address_space *mapping = page->mapping;
1143 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001144 struct buffer_head *bh, *head;
1145 struct gfs2_bufdata *bd;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001146
1147 if (!page_has_buffers(page))
Steven Whitehouse891ba6d2007-09-20 15:26:33 +01001148 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001149
Andreas Gruenbacher1c185c02016-08-18 08:57:04 -05001150 /*
1151 * From xfs_vm_releasepage: mm accommodates an old ext3 case where
1152 * clean pages might not have had the dirty bit cleared. Thus, it can
1153 * send actual dirty pages to ->releasepage() via shrink_active_list().
1154 *
1155 * As a workaround, we skip pages that contain dirty buffers below.
1156 * Once ->releasepage isn't called on dirty pages anymore, we can warn
1157 * on dirty buffers like we used to here again.
1158 */
1159
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001160 gfs2_log_lock(sdp);
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001161 spin_lock(&sdp->sd_ail_lock);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001162 head = bh = page_buffers(page);
1163 do {
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001164 if (atomic_read(&bh->b_count))
1165 goto cannot_release;
1166 bd = bh->b_private;
Benjamin Marzinski16ca9412013-04-05 20:31:46 -05001167 if (bd && bd->bd_tr)
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001168 goto cannot_release;
Andreas Gruenbacher1c185c02016-08-18 08:57:04 -05001169 if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh)))
1170 goto cannot_release;
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001171 bh = bh->b_this_page;
1172 } while(bh != head);
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001173 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001174
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001175 head = bh = page_buffers(page);
1176 do {
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001177 bd = bh->b_private;
1178 if (bd) {
1179 gfs2_assert_warn(sdp, bd->bd_bh == bh);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001180 if (!list_empty(&bd->bd_list))
1181 list_del_init(&bd->bd_list);
1182 bd->bd_bh = NULL;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001183 bh->b_private = NULL;
Steven Whitehouse623d9352006-08-31 12:14:44 -04001184 kmem_cache_free(gfs2_bufdata_cachep, bd);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001185 }
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001186
1187 bh = bh->b_this_page;
Steven Whitehouse166afcc2006-08-24 15:59:40 -04001188 } while (bh != head);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001189 gfs2_log_unlock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001190
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001191 return try_to_free_buffers(page);
Steven Whitehouse8f065d32011-05-03 11:49:19 +01001192
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001193cannot_release:
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001194 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001195 gfs2_log_unlock(sdp);
1196 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001197}
1198
Steven Whitehouse55610932007-10-17 08:47:38 +01001199static const struct address_space_operations gfs2_writeback_aops = {
Steven Whitehouse9d358142013-08-27 21:22:07 +01001200 .writepage = gfs2_writepage,
Steven Whitehouse45138992013-01-28 09:30:07 +00001201 .writepages = gfs2_writepages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001202 .readpage = gfs2_readpage,
1203 .readpages = gfs2_readpages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001204 .write_begin = gfs2_write_begin,
1205 .write_end = gfs2_write_end,
1206 .bmap = gfs2_bmap,
1207 .invalidatepage = gfs2_invalidatepage,
1208 .releasepage = gfs2_releasepage,
1209 .direct_IO = gfs2_direct_IO,
Steven Whitehousee5d9dc22008-01-03 11:31:38 +00001210 .migratepage = buffer_migrate_page,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001211 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001212 .error_remove_page = generic_error_remove_page,
Steven Whitehouse55610932007-10-17 08:47:38 +01001213};
1214
1215static const struct address_space_operations gfs2_ordered_aops = {
Steven Whitehouse9d358142013-08-27 21:22:07 +01001216 .writepage = gfs2_writepage,
Steven Whitehouse45138992013-01-28 09:30:07 +00001217 .writepages = gfs2_writepages,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001218 .readpage = gfs2_readpage,
Steven Whitehousefd88de562006-05-05 16:59:11 -04001219 .readpages = gfs2_readpages,
Steven Whitehouse7765ec22007-10-16 01:25:07 -07001220 .write_begin = gfs2_write_begin,
1221 .write_end = gfs2_write_end,
Robert Peterson8fb68592007-06-12 11:24:36 -05001222 .set_page_dirty = gfs2_set_page_dirty,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001223 .bmap = gfs2_bmap,
1224 .invalidatepage = gfs2_invalidatepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001225 .releasepage = gfs2_releasepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001226 .direct_IO = gfs2_direct_IO,
Steven Whitehousee5d9dc22008-01-03 11:31:38 +00001227 .migratepage = buffer_migrate_page,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001228 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001229 .error_remove_page = generic_error_remove_page,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001230};
1231
Steven Whitehouse55610932007-10-17 08:47:38 +01001232static const struct address_space_operations gfs2_jdata_aops = {
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +01001233 .writepage = gfs2_jdata_writepage,
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +01001234 .writepages = gfs2_jdata_writepages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001235 .readpage = gfs2_readpage,
1236 .readpages = gfs2_readpages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001237 .write_begin = gfs2_write_begin,
1238 .write_end = gfs2_write_end,
1239 .set_page_dirty = gfs2_set_page_dirty,
1240 .bmap = gfs2_bmap,
1241 .invalidatepage = gfs2_invalidatepage,
1242 .releasepage = gfs2_releasepage,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001243 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001244 .error_remove_page = generic_error_remove_page,
Steven Whitehouse55610932007-10-17 08:47:38 +01001245};
1246
1247void gfs2_set_aops(struct inode *inode)
1248{
1249 struct gfs2_inode *ip = GFS2_I(inode);
1250
1251 if (gfs2_is_writeback(ip))
1252 inode->i_mapping->a_ops = &gfs2_writeback_aops;
1253 else if (gfs2_is_ordered(ip))
1254 inode->i_mapping->a_ops = &gfs2_ordered_aops;
1255 else if (gfs2_is_jdata(ip))
1256 inode->i_mapping->a_ops = &gfs2_jdata_aops;
1257 else
1258 BUG();
1259}
1260