blob: e80a464850c835c976853161c5ad020ba23fa7c8 [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>
David Teiglandb3b94fa2006-01-16 16:50:04 +000023
24#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050025#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026#include "bmap.h"
27#include "glock.h"
28#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000029#include "log.h"
30#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000031#include "quota.h"
32#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000033#include "rgrp.h"
Robert Petersoncd81a4b2007-05-14 12:42:18 -050034#include "super.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050035#include "util.h"
Steven Whitehouse4340fe62006-07-11 09:46:33 -040036#include "glops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000037
Steven Whitehouseba7f7292006-07-26 11:27:10 -040038
Bob Petersonb1201932012-04-11 12:58:07 -040039static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
40 unsigned int from, unsigned int to)
Steven Whitehouseba7f7292006-07-26 11:27:10 -040041{
42 struct buffer_head *head = page_buffers(page);
43 unsigned int bsize = head->b_size;
44 struct buffer_head *bh;
45 unsigned int start, end;
46
47 for (bh = head, start = 0; bh != head || !start;
48 bh = bh->b_this_page, start = end) {
49 end = start + bsize;
50 if (end <= from || start >= to)
51 continue;
Benjamin Marzinskiddf4b422007-06-01 14:21:38 -050052 if (gfs2_is_jdata(ip))
53 set_buffer_uptodate(bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -040054 gfs2_trans_add_bh(ip->i_gl, bh, 0);
55 }
56}
57
David Teiglandb3b94fa2006-01-16 16:50:04 +000058/**
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040059 * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
David Teiglandb3b94fa2006-01-16 16:50:04 +000060 * @inode: The inode
61 * @lblock: The block number to look up
62 * @bh_result: The buffer head to return the result in
63 * @create: Non-zero if we may add block to the file
64 *
65 * Returns: errno
66 */
67
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040068static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
69 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000070{
David Teiglandb3b94fa2006-01-16 16:50:04 +000071 int error;
72
Bob Petersone9e1ef22007-12-10 14:13:27 -060073 error = gfs2_block_map(inode, lblock, bh_result, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +000074 if (error)
75 return error;
Wendy Chengde986e82007-09-18 09:19:13 -040076 if (!buffer_mapped(bh_result))
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040077 return -EIO;
Steven Whitehouse623d9352006-08-31 12:14:44 -040078 return 0;
79}
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040080
81static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
82 struct buffer_head *bh_result, int create)
83{
Bob Petersone9e1ef22007-12-10 14:13:27 -060084 return gfs2_block_map(inode, lblock, bh_result, 0);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040085}
86
David Teiglandb3b94fa2006-01-16 16:50:04 +000087/**
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010088 * gfs2_writepage_common - Common bits of writepage
89 * @page: The page to be written
90 * @wbc: The writeback control
David Teiglandb3b94fa2006-01-16 16:50:04 +000091 *
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010092 * Returns: 1 if writepage is ok, otherwise an error code or zero if no error.
David Teiglandb3b94fa2006-01-16 16:50:04 +000093 */
94
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010095static int gfs2_writepage_common(struct page *page,
96 struct writeback_control *wbc)
David Teiglandb3b94fa2006-01-16 16:50:04 +000097{
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000098 struct inode *inode = page->mapping->host;
Steven Whitehousef4387142006-08-08 13:23:19 -040099 struct gfs2_inode *ip = GFS2_I(inode);
100 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000101 loff_t i_size = i_size_read(inode);
102 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
103 unsigned offset;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100104
105 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
106 goto out;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100107 if (current->journal_info)
108 goto redirty;
109 /* Is the page fully outside i_size? (truncate in progress) */
110 offset = i_size & (PAGE_CACHE_SIZE-1);
111 if (page->index > end_index || (page->index == end_index && !offset)) {
112 page->mapping->a_ops->invalidatepage(page, 0);
113 goto out;
114 }
115 return 1;
116redirty:
117 redirty_page_for_writepage(wbc, page);
118out:
119 unlock_page(page);
120 return 0;
121}
122
123/**
124 * gfs2_writeback_writepage - Write page for writeback mappings
125 * @page: The page
126 * @wbc: The writeback control
127 *
128 */
129
130static int gfs2_writeback_writepage(struct page *page,
131 struct writeback_control *wbc)
132{
133 int ret;
134
135 ret = gfs2_writepage_common(page, wbc);
136 if (ret <= 0)
137 return ret;
138
Steven Whitehouse30116ff2010-06-14 09:58:41 +0100139 return nobh_writepage(page, gfs2_get_block_noalloc, wbc);
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100140}
141
142/**
143 * gfs2_ordered_writepage - Write page for ordered data files
144 * @page: The page to write
145 * @wbc: The writeback control
146 *
147 */
148
149static int gfs2_ordered_writepage(struct page *page,
150 struct writeback_control *wbc)
151{
152 struct inode *inode = page->mapping->host;
153 struct gfs2_inode *ip = GFS2_I(inode);
154 int ret;
155
156 ret = gfs2_writepage_common(page, wbc);
157 if (ret <= 0)
158 return ret;
159
160 if (!page_has_buffers(page)) {
161 create_empty_buffers(page, inode->i_sb->s_blocksize,
162 (1 << BH_Dirty)|(1 << BH_Uptodate));
163 }
164 gfs2_page_add_databufs(ip, page, 0, inode->i_sb->s_blocksize-1);
165 return block_write_full_page(page, gfs2_get_block_noalloc, wbc);
166}
167
168/**
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100169 * __gfs2_jdata_writepage - The core of jdata writepage
170 * @page: The page to write
171 * @wbc: The writeback control
172 *
173 * This is shared between writepage and writepages and implements the
174 * core of the writepage operation. If a transaction is required then
175 * PageChecked will have been set and the transaction will have
176 * already been started before this is called.
177 */
178
179static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
180{
181 struct inode *inode = page->mapping->host;
182 struct gfs2_inode *ip = GFS2_I(inode);
183 struct gfs2_sbd *sdp = GFS2_SB(inode);
184
185 if (PageChecked(page)) {
186 ClearPageChecked(page);
187 if (!page_has_buffers(page)) {
188 create_empty_buffers(page, inode->i_sb->s_blocksize,
189 (1 << BH_Dirty)|(1 << BH_Uptodate));
190 }
191 gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
192 }
193 return block_write_full_page(page, gfs2_get_block_noalloc, wbc);
194}
195
196/**
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100197 * gfs2_jdata_writepage - Write complete page
198 * @page: Page to write
199 *
200 * Returns: errno
201 *
202 */
203
204static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
205{
206 struct inode *inode = page->mapping->host;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100207 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100208 int ret;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000209 int done_trans = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000210
Steven Whitehousebf36a712007-10-17 08:35:19 +0100211 if (PageChecked(page)) {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100212 if (wbc->sync_mode != WB_SYNC_ALL)
213 goto out_ignore;
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100214 ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
215 if (ret)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000216 goto out_ignore;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000217 done_trans = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000218 }
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100219 ret = gfs2_writepage_common(page, wbc);
220 if (ret > 0)
221 ret = __gfs2_jdata_writepage(page, wbc);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000222 if (done_trans)
223 gfs2_trans_end(sdp);
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100224 return ret;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000225
226out_ignore:
227 redirty_page_for_writepage(wbc, page);
228 unlock_page(page);
229 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000230}
231
232/**
Steven Whitehouse55610932007-10-17 08:47:38 +0100233 * gfs2_writeback_writepages - Write a bunch of dirty pages back to disk
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000234 * @mapping: The mapping to write
235 * @wbc: Write-back control
236 *
Steven Whitehouse55610932007-10-17 08:47:38 +0100237 * For the data=writeback case we can already ignore buffer heads
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000238 * and write whole extents at once. This is a big reduction in the
239 * number of I/O requests we send and the bmap calls we make in this case.
240 */
Steven Whitehouse55610932007-10-17 08:47:38 +0100241static int gfs2_writeback_writepages(struct address_space *mapping,
242 struct writeback_control *wbc)
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000243{
Steven Whitehouse55610932007-10-17 08:47:38 +0100244 return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000245}
246
247/**
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100248 * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages
249 * @mapping: The mapping
250 * @wbc: The writeback control
251 * @writepage: The writepage function to call for each page
252 * @pvec: The vector of pages
253 * @nr_pages: The number of pages to write
254 *
255 * Returns: non-zero if loop should terminate, zero otherwise
256 */
257
258static int gfs2_write_jdata_pagevec(struct address_space *mapping,
259 struct writeback_control *wbc,
260 struct pagevec *pvec,
261 int nr_pages, pgoff_t end)
262{
263 struct inode *inode = mapping->host;
264 struct gfs2_sbd *sdp = GFS2_SB(inode);
265 loff_t i_size = i_size_read(inode);
266 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
267 unsigned offset = i_size & (PAGE_CACHE_SIZE-1);
268 unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100269 int i;
270 int ret;
271
Abhijith Das20b95bf2008-03-06 17:43:52 -0600272 ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100273 if (ret < 0)
274 return ret;
275
276 for(i = 0; i < nr_pages; i++) {
277 struct page *page = pvec->pages[i];
278
279 lock_page(page);
280
281 if (unlikely(page->mapping != mapping)) {
282 unlock_page(page);
283 continue;
284 }
285
286 if (!wbc->range_cyclic && page->index > end) {
287 ret = 1;
288 unlock_page(page);
289 continue;
290 }
291
292 if (wbc->sync_mode != WB_SYNC_NONE)
293 wait_on_page_writeback(page);
294
295 if (PageWriteback(page) ||
296 !clear_page_dirty_for_io(page)) {
297 unlock_page(page);
298 continue;
299 }
300
301 /* Is the page fully outside i_size? (truncate in progress) */
302 if (page->index > end_index || (page->index == end_index && !offset)) {
303 page->mapping->a_ops->invalidatepage(page, 0);
304 unlock_page(page);
305 continue;
306 }
307
308 ret = __gfs2_jdata_writepage(page, wbc);
309
310 if (ret || (--(wbc->nr_to_write) <= 0))
311 ret = 1;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100312 }
313 gfs2_trans_end(sdp);
314 return ret;
315}
316
317/**
318 * gfs2_write_cache_jdata - Like write_cache_pages but different
319 * @mapping: The mapping to write
320 * @wbc: The writeback control
321 * @writepage: The writepage function to call
322 * @data: The data to pass to writepage
323 *
324 * The reason that we use our own function here is that we need to
325 * start transactions before we grab page locks. This allows us
326 * to get the ordering right.
327 */
328
329static int gfs2_write_cache_jdata(struct address_space *mapping,
330 struct writeback_control *wbc)
331{
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100332 int ret = 0;
333 int done = 0;
334 struct pagevec pvec;
335 int nr_pages;
336 pgoff_t index;
337 pgoff_t end;
338 int scanned = 0;
339 int range_whole = 0;
340
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100341 pagevec_init(&pvec, 0);
342 if (wbc->range_cyclic) {
343 index = mapping->writeback_index; /* Start from prev offset */
344 end = -1;
345 } else {
346 index = wbc->range_start >> PAGE_CACHE_SHIFT;
347 end = wbc->range_end >> PAGE_CACHE_SHIFT;
348 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
349 range_whole = 1;
350 scanned = 1;
351 }
352
353retry:
354 while (!done && (index <= end) &&
355 (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
356 PAGECACHE_TAG_DIRTY,
357 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
358 scanned = 1;
359 ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end);
360 if (ret)
361 done = 1;
362 if (ret > 0)
363 ret = 0;
364
365 pagevec_release(&pvec);
366 cond_resched();
367 }
368
369 if (!scanned && !done) {
370 /*
371 * We hit the last page and there is more work to be done: wrap
372 * back to the start of the file
373 */
374 scanned = 1;
375 index = 0;
376 goto retry;
377 }
378
379 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
380 mapping->writeback_index = index;
381 return ret;
382}
383
384
385/**
386 * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
387 * @mapping: The mapping to write
388 * @wbc: The writeback control
389 *
390 */
391
392static int gfs2_jdata_writepages(struct address_space *mapping,
393 struct writeback_control *wbc)
394{
395 struct gfs2_inode *ip = GFS2_I(mapping->host);
396 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
397 int ret;
398
399 ret = gfs2_write_cache_jdata(mapping, wbc);
400 if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
401 gfs2_log_flush(sdp, ip->i_gl);
402 ret = gfs2_write_cache_jdata(mapping, wbc);
403 }
404 return ret;
405}
406
407/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000408 * stuffed_readpage - Fill in a Linux page with stuffed file data
409 * @ip: the inode
410 * @page: the page
411 *
412 * Returns: errno
413 */
414
415static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
416{
417 struct buffer_head *dibh;
Steven Whitehouse602c89d2010-03-25 14:32:43 +0000418 u64 dsize = i_size_read(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000419 void *kaddr;
420 int error;
421
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100422 /*
Nick Piggin3c18ddd2008-04-28 02:12:10 -0700423 * Due to the order of unstuffing files and ->fault(), we can be
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100424 * asked for a zero page in the case of a stuffed file being extended,
425 * so we need to supply one here. It doesn't happen often.
426 */
427 if (unlikely(page->index)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800428 zero_user(page, 0, PAGE_CACHE_SIZE);
Abhijith Das0a7ab792009-01-07 16:03:37 -0600429 SetPageUptodate(page);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100430 return 0;
431 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400432
David Teiglandb3b94fa2006-01-16 16:50:04 +0000433 error = gfs2_meta_inode_buffer(ip, &dibh);
434 if (error)
435 return error;
436
Cong Wangd9349282011-11-25 23:14:30 +0800437 kaddr = kmap_atomic(page);
Steven Whitehouse602c89d2010-03-25 14:32:43 +0000438 if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
439 dsize = (dibh->b_size - sizeof(struct gfs2_dinode));
440 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
441 memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize);
Cong Wangd9349282011-11-25 23:14:30 +0800442 kunmap_atomic(kaddr);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100443 flush_dcache_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000444 brelse(dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000445 SetPageUptodate(page);
446
447 return 0;
448}
449
David Teiglandb3b94fa2006-01-16 16:50:04 +0000450
451/**
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100452 * __gfs2_readpage - readpage
453 * @file: The file to read a page for
David Teiglandb3b94fa2006-01-16 16:50:04 +0000454 * @page: The page to read
455 *
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100456 * This is the core of gfs2's readpage. Its used by the internal file
457 * reading code as in that case we already hold the glock. Also its
458 * called by gfs2_readpage() once the required lock has been granted.
459 *
460 */
461
462static int __gfs2_readpage(void *file, struct page *page)
463{
464 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
465 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
466 int error;
467
468 if (gfs2_is_stuffed(ip)) {
469 error = stuffed_readpage(ip, page);
470 unlock_page(page);
471 } else {
Bob Petersone9e1ef22007-12-10 14:13:27 -0600472 error = mpage_readpage(page, gfs2_block_map);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100473 }
474
475 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
476 return -EIO;
477
478 return error;
479}
480
481/**
482 * gfs2_readpage - read a page of a file
483 * @file: The file to read
484 * @page: The page of the file
485 *
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100486 * This deals with the locking required. We have to unlock and
487 * relock the page in order to get the locking in the right
488 * order.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000489 */
490
491static int gfs2_readpage(struct file *file, struct page *page)
492{
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100493 struct address_space *mapping = page->mapping;
494 struct gfs2_inode *ip = GFS2_I(mapping->host);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100495 struct gfs2_holder gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000496 int error;
497
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100498 unlock_page(page);
Steven Whitehouse719ee342008-09-18 13:53:59 +0100499 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
500 error = gfs2_glock_nq(&gh);
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100501 if (unlikely(error))
Steven Whitehouse6802e342008-05-21 17:03:22 +0100502 goto out;
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100503 error = AOP_TRUNCATED_PAGE;
504 lock_page(page);
505 if (page->mapping == mapping && !PageUptodate(page))
506 error = __gfs2_readpage(file, page);
507 else
508 unlock_page(page);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100509 gfs2_glock_dq(&gh);
Steven Whitehouse7afd88d2008-02-22 16:07:18 +0000510out:
Steven Whitehouse6802e342008-05-21 17:03:22 +0100511 gfs2_holder_uninit(&gh);
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100512 if (error && error != AOP_TRUNCATED_PAGE)
513 lock_page(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100514 return error;
515}
516
517/**
518 * gfs2_internal_read - read an internal file
519 * @ip: The gfs2 inode
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100520 * @buf: The buffer to fill
521 * @pos: The file position
522 * @size: The amount to read
523 *
524 */
525
Andrew Price43066292012-04-16 16:40:55 +0100526int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
527 unsigned size)
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100528{
529 struct address_space *mapping = ip->i_inode.i_mapping;
530 unsigned long index = *pos / PAGE_CACHE_SIZE;
531 unsigned offset = *pos & (PAGE_CACHE_SIZE - 1);
532 unsigned copied = 0;
533 unsigned amt;
534 struct page *page;
535 void *p;
536
537 do {
538 amt = size - copied;
539 if (offset + size > PAGE_CACHE_SIZE)
540 amt = PAGE_CACHE_SIZE - offset;
541 page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
542 if (IS_ERR(page))
543 return PTR_ERR(page);
Cong Wangd9349282011-11-25 23:14:30 +0800544 p = kmap_atomic(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100545 memcpy(buf + copied, p + offset, amt);
Cong Wangd9349282011-11-25 23:14:30 +0800546 kunmap_atomic(p);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100547 mark_page_accessed(page);
548 page_cache_release(page);
549 copied += amt;
550 index++;
551 offset = 0;
552 } while(copied < size);
553 (*pos) += size;
554 return size;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400555}
556
Steven Whitehousefd88de562006-05-05 16:59:11 -0400557/**
558 * gfs2_readpages - Read a bunch of pages at once
559 *
560 * Some notes:
561 * 1. This is only for readahead, so we can simply ignore any things
562 * which are slightly inconvenient (such as locking conflicts between
563 * the page lock and the glock) and return having done no I/O. Its
564 * obviously not something we'd want to do on too regular a basis.
565 * Any I/O we ignore at this time will be done via readpage later.
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500566 * 2. We don't handle stuffed files here we let readpage do the honours.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400567 * 3. mpage_readpages() does most of the heavy lifting in the common case.
Bob Petersone9e1ef22007-12-10 14:13:27 -0600568 * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400569 */
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100570
Steven Whitehousefd88de562006-05-05 16:59:11 -0400571static int gfs2_readpages(struct file *file, struct address_space *mapping,
572 struct list_head *pages, unsigned nr_pages)
573{
574 struct inode *inode = mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400575 struct gfs2_inode *ip = GFS2_I(inode);
576 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400577 struct gfs2_holder gh;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100578 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400579
Steven Whitehouse719ee342008-09-18 13:53:59 +0100580 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
581 ret = gfs2_glock_nq(&gh);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100582 if (unlikely(ret))
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100583 goto out_uninit;
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500584 if (!gfs2_is_stuffed(ip))
Bob Petersone9e1ef22007-12-10 14:13:27 -0600585 ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100586 gfs2_glock_dq(&gh);
587out_uninit:
588 gfs2_holder_uninit(&gh);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400589 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
590 ret = -EIO;
591 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000592}
593
594/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700595 * gfs2_write_begin - Begin to write to a file
David Teiglandb3b94fa2006-01-16 16:50:04 +0000596 * @file: The file to write to
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700597 * @mapping: The mapping in which to write
598 * @pos: The file offset at which to start writing
599 * @len: Length of the write
600 * @flags: Various flags
601 * @pagep: Pointer to return the page
602 * @fsdata: Pointer to return fs data (unused by GFS2)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000603 *
604 * Returns: errno
605 */
606
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700607static int gfs2_write_begin(struct file *file, struct address_space *mapping,
608 loff_t pos, unsigned len, unsigned flags,
609 struct page **pagep, void **fsdata)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000610{
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700611 struct gfs2_inode *ip = GFS2_I(mapping->host);
612 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500613 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000614 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000615 int alloc_required;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000616 int error = 0;
Bob Peterson564e12b2011-11-21 13:36:17 -0500617 struct gfs2_qadata *qa = NULL;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700618 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
619 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700620 struct page *page;
Russell Cattelan52ae7b72006-10-09 12:11:54 -0500621
Steven Whitehouse719ee342008-09-18 13:53:59 +0100622 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
623 error = gfs2_glock_nq(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700624 if (unlikely(error))
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000625 goto out_uninit;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500626 if (&ip->i_inode == sdp->sd_rindex) {
627 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
628 GL_NOCACHE, &m_ip->i_gh);
629 if (unlikely(error)) {
630 gfs2_glock_dq(&ip->i_gh);
631 goto out_uninit;
632 }
633 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000634
Bob Peterson461cb412010-06-24 19:21:20 -0400635 alloc_required = gfs2_write_alloc_required(ip, pos, len);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000636
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000637 if (alloc_required || gfs2_is_jdata(ip))
638 gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
639
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000640 if (alloc_required) {
Bob Peterson564e12b2011-11-21 13:36:17 -0500641 qa = gfs2_qadata_get(ip);
642 if (!qa) {
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +0300643 error = -ENOMEM;
644 goto out_unlock;
645 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000646
Steven Whitehoused82661d2008-03-10 15:34:50 +0000647 error = gfs2_quota_lock_check(ip);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000648 if (error)
649 goto out_alloc_put;
650
Bob Peterson564e12b2011-11-21 13:36:17 -0500651 error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000652 if (error)
653 goto out_qunlock;
654 }
655
656 rblocks = RES_DINODE + ind_blocks;
657 if (gfs2_is_jdata(ip))
658 rblocks += data_blocks ? data_blocks : 1;
659 if (ind_blocks || data_blocks)
660 rblocks += RES_STATFS + RES_QUOTA;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500661 if (&ip->i_inode == sdp->sd_rindex)
662 rblocks += 2 * RES_STATFS;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500663 if (alloc_required)
Steven Whitehouse54335b12011-09-01 13:31:59 +0100664 rblocks += gfs2_rg_blocks(ip);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000665
Steven Whitehouse16615be2007-09-17 10:59:52 +0100666 error = gfs2_trans_begin(sdp, rblocks,
667 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000668 if (error)
Steven Whitehousea867bb22007-07-17 10:29:02 +0100669 goto out_trans_fail;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000670
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100671 error = -ENOMEM;
Steven Whitehousee4fefba2009-01-06 10:08:33 +0000672 flags |= AOP_FLAG_NOFS;
Nick Piggin54566b22009-01-04 12:00:53 -0800673 page = grab_cache_page_write_begin(mapping, index, flags);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100674 *pagep = page;
675 if (unlikely(!page))
676 goto out_endtrans;
677
David Teiglandb3b94fa2006-01-16 16:50:04 +0000678 if (gfs2_is_stuffed(ip)) {
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100679 error = 0;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700680 if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400681 error = gfs2_unstuff_dinode(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000682 if (error == 0)
683 goto prepare_write;
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100684 } else if (!PageUptodate(page)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000685 error = stuffed_readpage(ip, page);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100686 }
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000687 goto out;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000688 }
689
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000690prepare_write:
Christoph Hellwigebdec242010-10-06 10:47:23 +0200691 error = __block_write_begin(page, from, len, gfs2_block_map);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000692out:
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100693 if (error == 0)
694 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000695
Maxim6c474f72011-03-14 13:19:21 +0000696 unlock_page(page);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100697 page_cache_release(page);
npiggin@suse.de15c6fd92010-05-27 01:05:34 +1000698
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100699 gfs2_trans_end(sdp);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100700 if (pos + len > ip->i_inode.i_size)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100701 gfs2_trim_blocks(&ip->i_inode);
702 goto out_trans_fail;
703
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100704out_endtrans:
705 gfs2_trans_end(sdp);
706out_trans_fail:
707 if (alloc_required) {
708 gfs2_inplace_release(ip);
709out_qunlock:
710 gfs2_quota_unlock(ip);
711out_alloc_put:
Bob Peterson564e12b2011-11-21 13:36:17 -0500712 gfs2_qadata_put(ip);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100713 }
714out_unlock:
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500715 if (&ip->i_inode == sdp->sd_rindex) {
716 gfs2_glock_dq(&m_ip->i_gh);
717 gfs2_holder_uninit(&m_ip->i_gh);
718 }
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100719 gfs2_glock_dq(&ip->i_gh);
720out_uninit:
721 gfs2_holder_uninit(&ip->i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000722 return error;
723}
724
725/**
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500726 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
727 * @inode: the rindex inode
728 */
729static void adjust_fs_space(struct inode *inode)
730{
731 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500732 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
733 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500734 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
735 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500736 struct buffer_head *m_bh, *l_bh;
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500737 u64 fs_total, new_free;
738
739 /* Total up the file system space, according to the latest rindex. */
740 fs_total = gfs2_ri_total(sdp);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500741 if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
742 return;
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500743
744 spin_lock(&sdp->sd_statfs_spin);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500745 gfs2_statfs_change_in(m_sc, m_bh->b_data +
746 sizeof(struct gfs2_dinode));
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500747 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
748 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
749 else
750 new_free = 0;
751 spin_unlock(&sdp->sd_statfs_spin);
Robert Peterson6c532672007-05-10 16:54:38 -0500752 fs_warn(sdp, "File system extended by %llu blocks.\n",
753 (unsigned long long)new_free);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500754 gfs2_statfs_change(sdp, new_free, new_free, 0);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500755
756 if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0)
757 goto out;
758 update_statfs(sdp, m_bh, l_bh);
759 brelse(l_bh);
760out:
761 brelse(m_bh);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500762}
763
764/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700765 * gfs2_stuffed_write_end - Write end for stuffed files
766 * @inode: The inode
767 * @dibh: The buffer_head containing the on-disk inode
768 * @pos: The file position
769 * @len: The length of the write
770 * @copied: How much was actually copied by the VFS
771 * @page: The page
772 *
773 * This copies the data from the page into the inode block after
774 * the inode data structure itself.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000775 *
776 * Returns: errno
777 */
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700778static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
779 loff_t pos, unsigned len, unsigned copied,
780 struct page *page)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000781{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400782 struct gfs2_inode *ip = GFS2_I(inode);
783 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500784 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700785 u64 to = pos + copied;
786 void *kaddr;
787 unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000788
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700789 BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode)));
Cong Wangd9349282011-11-25 23:14:30 +0800790 kaddr = kmap_atomic(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700791 memcpy(buf + pos, kaddr + pos, copied);
792 memset(kaddr + pos + copied, 0, len - copied);
793 flush_dcache_page(page);
Cong Wangd9349282011-11-25 23:14:30 +0800794 kunmap_atomic(kaddr);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000795
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700796 if (!PageUptodate(page))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000797 SetPageUptodate(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700798 unlock_page(page);
799 page_cache_release(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000800
Abhijith Das7537d81a2009-05-12 11:16:20 -0500801 if (copied) {
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100802 if (inode->i_size < to)
Abhijith Das7537d81a2009-05-12 11:16:20 -0500803 i_size_write(inode, to);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700804 mark_inode_dirty(inode);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400805 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000806
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600807 if (inode == sdp->sd_rindex) {
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500808 adjust_fs_space(inode);
Bob Petersonca9248d2012-04-10 08:56:04 -0400809 sdp->sd_rindex_uptodate = 0;
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600810 }
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500811
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000812 brelse(dibh);
813 gfs2_trans_end(sdp);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500814 if (inode == sdp->sd_rindex) {
815 gfs2_glock_dq(&m_ip->i_gh);
816 gfs2_holder_uninit(&m_ip->i_gh);
817 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700818 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000819 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700820 return copied;
821}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000822
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700823/**
824 * gfs2_write_end
825 * @file: The file to write to
826 * @mapping: The address space to write to
827 * @pos: The file position
828 * @len: The length of the data
829 * @copied:
830 * @page: The page that has been written
831 * @fsdata: The fsdata (unused in GFS2)
832 *
833 * The main write_end function for GFS2. We have a separate one for
834 * stuffed files as they are slightly different, otherwise we just
835 * put our locking around the VFS provided functions.
836 *
837 * Returns: errno
838 */
839
840static int gfs2_write_end(struct file *file, struct address_space *mapping,
841 loff_t pos, unsigned len, unsigned copied,
842 struct page *page, void *fsdata)
843{
844 struct inode *inode = page->mapping->host;
845 struct gfs2_inode *ip = GFS2_I(inode);
846 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500847 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700848 struct buffer_head *dibh;
Bob Peterson564e12b2011-11-21 13:36:17 -0500849 struct gfs2_qadata *qa = ip->i_qadata;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700850 unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
851 unsigned int to = from + len;
852 int ret;
853
Steven Whitehouse7afd88d2008-02-22 16:07:18 +0000854 BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700855
856 ret = gfs2_meta_inode_buffer(ip, &dibh);
857 if (unlikely(ret)) {
858 unlock_page(page);
859 page_cache_release(page);
860 goto failed;
861 }
862
863 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
864
865 if (gfs2_is_stuffed(ip))
866 return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
867
Steven Whitehousebf36a712007-10-17 08:35:19 +0100868 if (!gfs2_is_writeback(ip))
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700869 gfs2_page_add_databufs(ip, page, from, to);
870
871 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700872
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600873 if (inode == sdp->sd_rindex) {
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700874 adjust_fs_space(inode);
Bob Petersonca9248d2012-04-10 08:56:04 -0400875 sdp->sd_rindex_uptodate = 0;
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600876 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700877
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000878 brelse(dibh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700879failed:
Bob Petersondeab72d2011-03-16 16:32:39 -0400880 gfs2_trans_end(sdp);
Bob Peterson564e12b2011-11-21 13:36:17 -0500881 if (ip->i_res)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000882 gfs2_inplace_release(ip);
Bob Peterson564e12b2011-11-21 13:36:17 -0500883 if (qa) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000884 gfs2_quota_unlock(ip);
Bob Peterson564e12b2011-11-21 13:36:17 -0500885 gfs2_qadata_put(ip);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000886 }
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500887 if (inode == sdp->sd_rindex) {
888 gfs2_glock_dq(&m_ip->i_gh);
889 gfs2_holder_uninit(&m_ip->i_gh);
890 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700891 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000892 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700893 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000894}
895
896/**
Robert Peterson8fb68592007-06-12 11:24:36 -0500897 * gfs2_set_page_dirty - Page dirtying function
898 * @page: The page to dirty
899 *
900 * Returns: 1 if it dirtyed the page, or 0 otherwise
901 */
902
903static int gfs2_set_page_dirty(struct page *page)
904{
Steven Whitehouse55610932007-10-17 08:47:38 +0100905 SetPageChecked(page);
Robert Peterson8fb68592007-06-12 11:24:36 -0500906 return __set_page_dirty_buffers(page);
907}
908
909/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000910 * gfs2_bmap - Block map function
911 * @mapping: Address space info
912 * @lblock: The block to map
913 *
914 * Returns: The disk address for the block or 0 on hole or error
915 */
916
917static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
918{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400919 struct gfs2_inode *ip = GFS2_I(mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000920 struct gfs2_holder i_gh;
921 sector_t dblock = 0;
922 int error;
923
David Teiglandb3b94fa2006-01-16 16:50:04 +0000924 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
925 if (error)
926 return 0;
927
928 if (!gfs2_is_stuffed(ip))
Bob Petersone9e1ef22007-12-10 14:13:27 -0600929 dblock = generic_block_bmap(mapping, lblock, gfs2_block_map);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000930
931 gfs2_glock_dq_uninit(&i_gh);
932
933 return dblock;
934}
935
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100936static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
937{
938 struct gfs2_bufdata *bd;
939
940 lock_buffer(bh);
941 gfs2_log_lock(sdp);
942 clear_buffer_dirty(bh);
943 bd = bh->b_private;
944 if (bd) {
Bob Petersonc0752aa2012-05-01 12:00:34 -0400945 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
946 list_del_init(&bd->bd_list);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100947 else
948 gfs2_remove_from_journal(bh, current->journal_info, 0);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100949 }
950 bh->b_bdev = NULL;
951 clear_buffer_mapped(bh);
952 clear_buffer_req(bh);
953 clear_buffer_new(bh);
954 gfs2_log_unlock(sdp);
955 unlock_buffer(bh);
956}
957
Steven Whitehouse8628de02006-03-31 16:48:41 -0500958static void gfs2_invalidatepage(struct page *page, unsigned long offset)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000959{
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100960 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
961 struct buffer_head *bh, *head;
962 unsigned long pos = 0;
963
David Teiglandb3b94fa2006-01-16 16:50:04 +0000964 BUG_ON(!PageLocked(page));
Robert Peterson8fb68592007-06-12 11:24:36 -0500965 if (offset == 0)
966 ClearPageChecked(page);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100967 if (!page_has_buffers(page))
968 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000969
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100970 bh = head = page_buffers(page);
971 do {
972 if (offset <= pos)
973 gfs2_discard(sdp, bh);
974 pos += bh->b_size;
975 bh = bh->b_this_page;
976 } while (bh != head);
977out:
978 if (offset == 0)
979 try_to_release_page(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000980}
981
Steven Whitehousec7b33832006-12-14 18:24:26 +0000982/**
983 * gfs2_ok_for_dio - check that dio is valid on this file
984 * @ip: The inode
985 * @rw: READ or WRITE
986 * @offset: The offset at which we are reading or writing
987 *
988 * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
989 * 1 (to accept the i/o request)
990 */
991static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset)
992{
993 /*
994 * Should we return an error here? I can't see that O_DIRECT for
Steven Whitehouse55610932007-10-17 08:47:38 +0100995 * a stuffed file makes any sense. For now we'll silently fall
996 * back to buffered I/O
Steven Whitehousec7b33832006-12-14 18:24:26 +0000997 */
Steven Whitehousec7b33832006-12-14 18:24:26 +0000998 if (gfs2_is_stuffed(ip))
999 return 0;
1000
Bob Petersonacb57a32008-09-11 15:35:37 -04001001 if (offset >= i_size_read(&ip->i_inode))
Steven Whitehousec7b33832006-12-14 18:24:26 +00001002 return 0;
1003 return 1;
1004}
1005
1006
1007
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -04001008static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
1009 const struct iovec *iov, loff_t offset,
1010 unsigned long nr_segs)
Steven Whitehoused1665e42006-02-14 11:54:42 +00001011{
1012 struct file *file = iocb->ki_filp;
1013 struct inode *inode = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001014 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001015 struct gfs2_holder gh;
1016 int rv;
1017
1018 /*
Steven Whitehousec7b33832006-12-14 18:24:26 +00001019 * Deferred lock, even if its a write, since we do no allocation
1020 * on this path. All we need change is atime, and this lock mode
1021 * ensures that other nodes have flushed their buffered read caches
1022 * (i.e. their page cache entries for this inode). We do not,
1023 * unfortunately have the option of only flushing a range like
1024 * the VFS does.
Steven Whitehoused1665e42006-02-14 11:54:42 +00001025 */
Steven Whitehouse719ee342008-09-18 13:53:59 +01001026 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
1027 rv = gfs2_glock_nq(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001028 if (rv)
Steven Whitehousec7b33832006-12-14 18:24:26 +00001029 return rv;
1030 rv = gfs2_ok_for_dio(ip, rw, offset);
1031 if (rv != 1)
1032 goto out; /* dio not valid, fall back to buffered i/o */
Steven Whitehoused1665e42006-02-14 11:54:42 +00001033
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +02001034 rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
1035 offset, nr_segs, gfs2_get_block_direct,
1036 NULL, NULL, 0);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001037out:
1038 gfs2_glock_dq_m(1, &gh);
1039 gfs2_holder_uninit(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001040 return rv;
1041}
1042
1043/**
Steven Whitehouse623d9352006-08-31 12:14:44 -04001044 * gfs2_releasepage - free the metadata associated with a page
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001045 * @page: the page that's being released
1046 * @gfp_mask: passed from Linux VFS, ignored by us
1047 *
1048 * Call try_to_free_buffers() if the buffers in this page can be
1049 * released.
1050 *
1051 * Returns: 0
1052 */
1053
1054int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
1055{
Steven Whitehouse009d8512009-12-08 12:12:13 +00001056 struct address_space *mapping = page->mapping;
1057 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001058 struct buffer_head *bh, *head;
1059 struct gfs2_bufdata *bd;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001060
1061 if (!page_has_buffers(page))
Steven Whitehouse891ba6d2007-09-20 15:26:33 +01001062 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001063
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001064 gfs2_log_lock(sdp);
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001065 spin_lock(&sdp->sd_ail_lock);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001066 head = bh = page_buffers(page);
1067 do {
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001068 if (atomic_read(&bh->b_count))
1069 goto cannot_release;
1070 bd = bh->b_private;
1071 if (bd && bd->bd_ail)
1072 goto cannot_release;
Steven Whitehouse8f065d32011-05-03 11:49:19 +01001073 if (buffer_pinned(bh) || buffer_dirty(bh))
1074 goto not_possible;
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001075 bh = bh->b_this_page;
1076 } while(bh != head);
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001077 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001078 gfs2_log_unlock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001079
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001080 head = bh = page_buffers(page);
1081 do {
Steven Whitehouse623d9352006-08-31 12:14:44 -04001082 gfs2_log_lock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001083 bd = bh->b_private;
1084 if (bd) {
1085 gfs2_assert_warn(sdp, bd->bd_bh == bh);
Bob Petersonc0752aa2012-05-01 12:00:34 -04001086 if (!list_empty(&bd->bd_list)) {
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001087 if (!buffer_pinned(bh))
Bob Petersonc0752aa2012-05-01 12:00:34 -04001088 list_del_init(&bd->bd_list);
Steven Whitehoused7b616e2007-09-02 10:48:13 +01001089 else
1090 bd = NULL;
1091 }
1092 if (bd)
1093 bd->bd_bh = NULL;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001094 bh->b_private = NULL;
1095 }
Steven Whitehouse623d9352006-08-31 12:14:44 -04001096 gfs2_log_unlock(sdp);
1097 if (bd)
1098 kmem_cache_free(gfs2_bufdata_cachep, bd);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001099
1100 bh = bh->b_this_page;
Steven Whitehouse166afcc2006-08-24 15:59:40 -04001101 } while (bh != head);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001102
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001103 return try_to_free_buffers(page);
Steven Whitehouse8f065d32011-05-03 11:49:19 +01001104
1105not_possible: /* Should never happen */
1106 WARN_ON(buffer_dirty(bh));
1107 WARN_ON(buffer_pinned(bh));
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001108cannot_release:
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001109 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001110 gfs2_log_unlock(sdp);
1111 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001112}
1113
Steven Whitehouse55610932007-10-17 08:47:38 +01001114static const struct address_space_operations gfs2_writeback_aops = {
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +01001115 .writepage = gfs2_writeback_writepage,
Steven Whitehouse55610932007-10-17 08:47:38 +01001116 .writepages = gfs2_writeback_writepages,
1117 .readpage = gfs2_readpage,
1118 .readpages = gfs2_readpages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001119 .write_begin = gfs2_write_begin,
1120 .write_end = gfs2_write_end,
1121 .bmap = gfs2_bmap,
1122 .invalidatepage = gfs2_invalidatepage,
1123 .releasepage = gfs2_releasepage,
1124 .direct_IO = gfs2_direct_IO,
Steven Whitehousee5d9dc22008-01-03 11:31:38 +00001125 .migratepage = buffer_migrate_page,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001126 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001127 .error_remove_page = generic_error_remove_page,
Steven Whitehouse55610932007-10-17 08:47:38 +01001128};
1129
1130static const struct address_space_operations gfs2_ordered_aops = {
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +01001131 .writepage = gfs2_ordered_writepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001132 .readpage = gfs2_readpage,
Steven Whitehousefd88de562006-05-05 16:59:11 -04001133 .readpages = gfs2_readpages,
Steven Whitehouse7765ec22007-10-16 01:25:07 -07001134 .write_begin = gfs2_write_begin,
1135 .write_end = gfs2_write_end,
Robert Peterson8fb68592007-06-12 11:24:36 -05001136 .set_page_dirty = gfs2_set_page_dirty,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001137 .bmap = gfs2_bmap,
1138 .invalidatepage = gfs2_invalidatepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001139 .releasepage = gfs2_releasepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001140 .direct_IO = gfs2_direct_IO,
Steven Whitehousee5d9dc22008-01-03 11:31:38 +00001141 .migratepage = buffer_migrate_page,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001142 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001143 .error_remove_page = generic_error_remove_page,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001144};
1145
Steven Whitehouse55610932007-10-17 08:47:38 +01001146static const struct address_space_operations gfs2_jdata_aops = {
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +01001147 .writepage = gfs2_jdata_writepage,
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +01001148 .writepages = gfs2_jdata_writepages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001149 .readpage = gfs2_readpage,
1150 .readpages = gfs2_readpages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001151 .write_begin = gfs2_write_begin,
1152 .write_end = gfs2_write_end,
1153 .set_page_dirty = gfs2_set_page_dirty,
1154 .bmap = gfs2_bmap,
1155 .invalidatepage = gfs2_invalidatepage,
1156 .releasepage = gfs2_releasepage,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001157 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001158 .error_remove_page = generic_error_remove_page,
Steven Whitehouse55610932007-10-17 08:47:38 +01001159};
1160
1161void gfs2_set_aops(struct inode *inode)
1162{
1163 struct gfs2_inode *ip = GFS2_I(inode);
1164
1165 if (gfs2_is_writeback(ip))
1166 inode->i_mapping->a_ops = &gfs2_writeback_aops;
1167 else if (gfs2_is_ordered(ip))
1168 inode->i_mapping->a_ops = &gfs2_ordered_aops;
1169 else if (gfs2_is_jdata(ip))
1170 inode->i_mapping->a_ops = &gfs2_jdata_aops;
1171 else
1172 BUG();
1173}
1174