blob: 49436fa7cd4fdcf87fb9f9dae13743173df2ab52 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Bob Peterson7eabb772008-01-28 11:24:35 -06003 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/pagemap.h>
Steven Whitehousefd88de562006-05-05 16:59:11 -040016#include <linux/pagevec.h>
Steven Whitehouse9b124fb2006-01-30 11:55:32 +000017#include <linux/mpage.h>
Steven Whitehoused1665e42006-02-14 11:54:42 +000018#include <linux/fs.h>
Steven Whitehousea8d638e2007-01-15 13:52:17 +000019#include <linux/writeback.h>
Steven Whitehouse7765ec22007-10-16 01:25:07 -070020#include <linux/swap.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050021#include <linux/gfs2_ondisk.h>
Steven Whitehouse47e83b52007-10-18 11:15:50 +010022#include <linux/backing-dev.h>
Kent Overstreeta27bb332013-05-07 16:19:08 -070023#include <linux/aio.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000024
25#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050026#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000027#include "bmap.h"
28#include "glock.h"
29#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000030#include "log.h"
31#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000032#include "quota.h"
33#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000034#include "rgrp.h"
Robert Petersoncd81a4b2007-05-14 12:42:18 -050035#include "super.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050036#include "util.h"
Steven Whitehouse4340fe62006-07-11 09:46:33 -040037#include "glops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000038
Steven Whitehouseba7f7292006-07-26 11:27:10 -040039
Bob Petersonb1201932012-04-11 12:58:07 -040040static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
41 unsigned int from, unsigned int to)
Steven Whitehouseba7f7292006-07-26 11:27:10 -040042{
43 struct buffer_head *head = page_buffers(page);
44 unsigned int bsize = head->b_size;
45 struct buffer_head *bh;
46 unsigned int start, end;
47
48 for (bh = head, start = 0; bh != head || !start;
49 bh = bh->b_this_page, start = end) {
50 end = start + bsize;
51 if (end <= from || start >= to)
52 continue;
Benjamin Marzinskiddf4b422007-06-01 14:21:38 -050053 if (gfs2_is_jdata(ip))
54 set_buffer_uptodate(bh);
Steven Whitehouse350a9b02012-12-14 12:36:02 +000055 gfs2_trans_add_data(ip->i_gl, bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -040056 }
57}
58
David Teiglandb3b94fa2006-01-16 16:50:04 +000059/**
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040060 * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
David Teiglandb3b94fa2006-01-16 16:50:04 +000061 * @inode: The inode
62 * @lblock: The block number to look up
63 * @bh_result: The buffer head to return the result in
64 * @create: Non-zero if we may add block to the file
65 *
66 * Returns: errno
67 */
68
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040069static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
70 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000071{
David Teiglandb3b94fa2006-01-16 16:50:04 +000072 int error;
73
Bob Petersone9e1ef22007-12-10 14:13:27 -060074 error = gfs2_block_map(inode, lblock, bh_result, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +000075 if (error)
76 return error;
Wendy Chengde986e82007-09-18 09:19:13 -040077 if (!buffer_mapped(bh_result))
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040078 return -EIO;
Steven Whitehouse623d9352006-08-31 12:14:44 -040079 return 0;
80}
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040081
82static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
83 struct buffer_head *bh_result, int create)
84{
Bob Petersone9e1ef22007-12-10 14:13:27 -060085 return gfs2_block_map(inode, lblock, bh_result, 0);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040086}
87
David Teiglandb3b94fa2006-01-16 16:50:04 +000088/**
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010089 * gfs2_writepage_common - Common bits of writepage
90 * @page: The page to be written
91 * @wbc: The writeback control
David Teiglandb3b94fa2006-01-16 16:50:04 +000092 *
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010093 * Returns: 1 if writepage is ok, otherwise an error code or zero if no error.
David Teiglandb3b94fa2006-01-16 16:50:04 +000094 */
95
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +010096static int gfs2_writepage_common(struct page *page,
97 struct writeback_control *wbc)
David Teiglandb3b94fa2006-01-16 16:50:04 +000098{
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000099 struct inode *inode = page->mapping->host;
Steven Whitehousef4387142006-08-08 13:23:19 -0400100 struct gfs2_inode *ip = GFS2_I(inode);
101 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000102 loff_t i_size = i_size_read(inode);
103 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
104 unsigned offset;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100105
106 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
107 goto out;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100108 if (current->journal_info)
109 goto redirty;
110 /* Is the page fully outside i_size? (truncate in progress) */
111 offset = i_size & (PAGE_CACHE_SIZE-1);
112 if (page->index > end_index || (page->index == end_index && !offset)) {
Lukas Czernerd47992f2013-05-21 23:17:23 -0400113 page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE);
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100114 goto out;
115 }
116 return 1;
117redirty:
118 redirty_page_for_writepage(wbc, page);
119out:
120 unlock_page(page);
121 return 0;
122}
123
124/**
Steven Whitehouse9d358142013-08-27 21:22:07 +0100125 * gfs2_writepage - Write page for writeback mappings
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100126 * @page: The page
127 * @wbc: The writeback control
128 *
129 */
130
Steven Whitehouse9d358142013-08-27 21:22:07 +0100131static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100132{
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/**
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100143 * __gfs2_jdata_writepage - The core of jdata writepage
144 * @page: The page to write
145 * @wbc: The writeback control
146 *
147 * This is shared between writepage and writepages and implements the
148 * core of the writepage operation. If a transaction is required then
149 * PageChecked will have been set and the transaction will have
150 * already been started before this is called.
151 */
152
153static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
154{
155 struct inode *inode = page->mapping->host;
156 struct gfs2_inode *ip = GFS2_I(inode);
157 struct gfs2_sbd *sdp = GFS2_SB(inode);
158
159 if (PageChecked(page)) {
160 ClearPageChecked(page);
161 if (!page_has_buffers(page)) {
162 create_empty_buffers(page, inode->i_sb->s_blocksize,
163 (1 << BH_Dirty)|(1 << BH_Uptodate));
164 }
165 gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
166 }
167 return block_write_full_page(page, gfs2_get_block_noalloc, wbc);
168}
169
170/**
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100171 * gfs2_jdata_writepage - Write complete page
172 * @page: Page to write
173 *
174 * Returns: errno
175 *
176 */
177
178static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
179{
180 struct inode *inode = page->mapping->host;
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +0100181 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100182 int ret;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000183 int done_trans = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000184
Steven Whitehousebf36a712007-10-17 08:35:19 +0100185 if (PageChecked(page)) {
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100186 if (wbc->sync_mode != WB_SYNC_ALL)
187 goto out_ignore;
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100188 ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
189 if (ret)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000190 goto out_ignore;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000191 done_trans = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000192 }
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100193 ret = gfs2_writepage_common(page, wbc);
194 if (ret > 0)
195 ret = __gfs2_jdata_writepage(page, wbc);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000196 if (done_trans)
197 gfs2_trans_end(sdp);
Steven Whitehouse1bb73222008-10-15 09:46:39 +0100198 return ret;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000199
200out_ignore:
201 redirty_page_for_writepage(wbc, page);
202 unlock_page(page);
203 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000204}
205
206/**
Steven Whitehouse45138992013-01-28 09:30:07 +0000207 * gfs2_writepages - Write a bunch of dirty pages back to disk
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000208 * @mapping: The mapping to write
209 * @wbc: Write-back control
210 *
Steven Whitehouse45138992013-01-28 09:30:07 +0000211 * Used for both ordered and writeback modes.
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000212 */
Steven Whitehouse45138992013-01-28 09:30:07 +0000213static int gfs2_writepages(struct address_space *mapping,
214 struct writeback_control *wbc)
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000215{
Steven Whitehouse55610932007-10-17 08:47:38 +0100216 return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000217}
218
219/**
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100220 * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages
221 * @mapping: The mapping
222 * @wbc: The writeback control
223 * @writepage: The writepage function to call for each page
224 * @pvec: The vector of pages
225 * @nr_pages: The number of pages to write
226 *
227 * Returns: non-zero if loop should terminate, zero otherwise
228 */
229
230static int gfs2_write_jdata_pagevec(struct address_space *mapping,
231 struct writeback_control *wbc,
232 struct pagevec *pvec,
233 int nr_pages, pgoff_t end)
234{
235 struct inode *inode = mapping->host;
236 struct gfs2_sbd *sdp = GFS2_SB(inode);
237 loff_t i_size = i_size_read(inode);
238 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
239 unsigned offset = i_size & (PAGE_CACHE_SIZE-1);
240 unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100241 int i;
242 int ret;
243
Abhijith Das20b95bf2008-03-06 17:43:52 -0600244 ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100245 if (ret < 0)
246 return ret;
247
248 for(i = 0; i < nr_pages; i++) {
249 struct page *page = pvec->pages[i];
250
251 lock_page(page);
252
253 if (unlikely(page->mapping != mapping)) {
254 unlock_page(page);
255 continue;
256 }
257
258 if (!wbc->range_cyclic && page->index > end) {
259 ret = 1;
260 unlock_page(page);
261 continue;
262 }
263
264 if (wbc->sync_mode != WB_SYNC_NONE)
265 wait_on_page_writeback(page);
266
267 if (PageWriteback(page) ||
268 !clear_page_dirty_for_io(page)) {
269 unlock_page(page);
270 continue;
271 }
272
273 /* Is the page fully outside i_size? (truncate in progress) */
274 if (page->index > end_index || (page->index == end_index && !offset)) {
Lukas Czernerd47992f2013-05-21 23:17:23 -0400275 page->mapping->a_ops->invalidatepage(page, 0,
276 PAGE_CACHE_SIZE);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100277 unlock_page(page);
278 continue;
279 }
280
281 ret = __gfs2_jdata_writepage(page, wbc);
282
283 if (ret || (--(wbc->nr_to_write) <= 0))
284 ret = 1;
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100285 }
286 gfs2_trans_end(sdp);
287 return ret;
288}
289
290/**
291 * gfs2_write_cache_jdata - Like write_cache_pages but different
292 * @mapping: The mapping to write
293 * @wbc: The writeback control
294 * @writepage: The writepage function to call
295 * @data: The data to pass to writepage
296 *
297 * The reason that we use our own function here is that we need to
298 * start transactions before we grab page locks. This allows us
299 * to get the ordering right.
300 */
301
302static int gfs2_write_cache_jdata(struct address_space *mapping,
303 struct writeback_control *wbc)
304{
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100305 int ret = 0;
306 int done = 0;
307 struct pagevec pvec;
308 int nr_pages;
309 pgoff_t index;
310 pgoff_t end;
311 int scanned = 0;
312 int range_whole = 0;
313
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100314 pagevec_init(&pvec, 0);
315 if (wbc->range_cyclic) {
316 index = mapping->writeback_index; /* Start from prev offset */
317 end = -1;
318 } else {
319 index = wbc->range_start >> PAGE_CACHE_SHIFT;
320 end = wbc->range_end >> PAGE_CACHE_SHIFT;
321 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
322 range_whole = 1;
323 scanned = 1;
324 }
325
326retry:
327 while (!done && (index <= end) &&
328 (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
329 PAGECACHE_TAG_DIRTY,
330 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
331 scanned = 1;
332 ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end);
333 if (ret)
334 done = 1;
335 if (ret > 0)
336 ret = 0;
337
338 pagevec_release(&pvec);
339 cond_resched();
340 }
341
342 if (!scanned && !done) {
343 /*
344 * We hit the last page and there is more work to be done: wrap
345 * back to the start of the file
346 */
347 scanned = 1;
348 index = 0;
349 goto retry;
350 }
351
352 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
353 mapping->writeback_index = index;
354 return ret;
355}
356
357
358/**
359 * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
360 * @mapping: The mapping to write
361 * @wbc: The writeback control
362 *
363 */
364
365static int gfs2_jdata_writepages(struct address_space *mapping,
366 struct writeback_control *wbc)
367{
368 struct gfs2_inode *ip = GFS2_I(mapping->host);
369 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
370 int ret;
371
372 ret = gfs2_write_cache_jdata(mapping, wbc);
373 if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
374 gfs2_log_flush(sdp, ip->i_gl);
375 ret = gfs2_write_cache_jdata(mapping, wbc);
376 }
377 return ret;
378}
379
380/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000381 * stuffed_readpage - Fill in a Linux page with stuffed file data
382 * @ip: the inode
383 * @page: the page
384 *
385 * Returns: errno
386 */
387
388static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
389{
390 struct buffer_head *dibh;
Steven Whitehouse602c89d2010-03-25 14:32:43 +0000391 u64 dsize = i_size_read(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000392 void *kaddr;
393 int error;
394
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100395 /*
Nick Piggin3c18ddd2008-04-28 02:12:10 -0700396 * Due to the order of unstuffing files and ->fault(), we can be
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100397 * asked for a zero page in the case of a stuffed file being extended,
398 * so we need to supply one here. It doesn't happen often.
399 */
400 if (unlikely(page->index)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800401 zero_user(page, 0, PAGE_CACHE_SIZE);
Abhijith Das0a7ab792009-01-07 16:03:37 -0600402 SetPageUptodate(page);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100403 return 0;
404 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400405
David Teiglandb3b94fa2006-01-16 16:50:04 +0000406 error = gfs2_meta_inode_buffer(ip, &dibh);
407 if (error)
408 return error;
409
Cong Wangd9349282011-11-25 23:14:30 +0800410 kaddr = kmap_atomic(page);
Steven Whitehouse602c89d2010-03-25 14:32:43 +0000411 if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
412 dsize = (dibh->b_size - sizeof(struct gfs2_dinode));
413 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
414 memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize);
Cong Wangd9349282011-11-25 23:14:30 +0800415 kunmap_atomic(kaddr);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100416 flush_dcache_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000417 brelse(dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000418 SetPageUptodate(page);
419
420 return 0;
421}
422
David Teiglandb3b94fa2006-01-16 16:50:04 +0000423
424/**
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100425 * __gfs2_readpage - readpage
426 * @file: The file to read a page for
David Teiglandb3b94fa2006-01-16 16:50:04 +0000427 * @page: The page to read
428 *
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100429 * This is the core of gfs2's readpage. Its used by the internal file
430 * reading code as in that case we already hold the glock. Also its
431 * called by gfs2_readpage() once the required lock has been granted.
432 *
433 */
434
435static int __gfs2_readpage(void *file, struct page *page)
436{
437 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
438 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
439 int error;
440
441 if (gfs2_is_stuffed(ip)) {
442 error = stuffed_readpage(ip, page);
443 unlock_page(page);
444 } else {
Bob Petersone9e1ef22007-12-10 14:13:27 -0600445 error = mpage_readpage(page, gfs2_block_map);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100446 }
447
448 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
449 return -EIO;
450
451 return error;
452}
453
454/**
455 * gfs2_readpage - read a page of a file
456 * @file: The file to read
457 * @page: The page of the file
458 *
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100459 * This deals with the locking required. We have to unlock and
460 * relock the page in order to get the locking in the right
461 * order.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000462 */
463
464static int gfs2_readpage(struct file *file, struct page *page)
465{
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100466 struct address_space *mapping = page->mapping;
467 struct gfs2_inode *ip = GFS2_I(mapping->host);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100468 struct gfs2_holder gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000469 int error;
470
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100471 unlock_page(page);
Steven Whitehouse719ee342008-09-18 13:53:59 +0100472 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
473 error = gfs2_glock_nq(&gh);
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100474 if (unlikely(error))
Steven Whitehouse6802e342008-05-21 17:03:22 +0100475 goto out;
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100476 error = AOP_TRUNCATED_PAGE;
477 lock_page(page);
478 if (page->mapping == mapping && !PageUptodate(page))
479 error = __gfs2_readpage(file, page);
480 else
481 unlock_page(page);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100482 gfs2_glock_dq(&gh);
Steven Whitehouse7afd88d2008-02-22 16:07:18 +0000483out:
Steven Whitehouse6802e342008-05-21 17:03:22 +0100484 gfs2_holder_uninit(&gh);
Steven Whitehouse01b7c7a2008-06-02 09:14:54 +0100485 if (error && error != AOP_TRUNCATED_PAGE)
486 lock_page(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100487 return error;
488}
489
490/**
491 * gfs2_internal_read - read an internal file
492 * @ip: The gfs2 inode
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100493 * @buf: The buffer to fill
494 * @pos: The file position
495 * @size: The amount to read
496 *
497 */
498
Andrew Price43066292012-04-16 16:40:55 +0100499int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
500 unsigned size)
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100501{
502 struct address_space *mapping = ip->i_inode.i_mapping;
503 unsigned long index = *pos / PAGE_CACHE_SIZE;
504 unsigned offset = *pos & (PAGE_CACHE_SIZE - 1);
505 unsigned copied = 0;
506 unsigned amt;
507 struct page *page;
508 void *p;
509
510 do {
511 amt = size - copied;
512 if (offset + size > PAGE_CACHE_SIZE)
513 amt = PAGE_CACHE_SIZE - offset;
514 page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
515 if (IS_ERR(page))
516 return PTR_ERR(page);
Cong Wangd9349282011-11-25 23:14:30 +0800517 p = kmap_atomic(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100518 memcpy(buf + copied, p + offset, amt);
Cong Wangd9349282011-11-25 23:14:30 +0800519 kunmap_atomic(p);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100520 mark_page_accessed(page);
521 page_cache_release(page);
522 copied += amt;
523 index++;
524 offset = 0;
525 } while(copied < size);
526 (*pos) += size;
527 return size;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400528}
529
Steven Whitehousefd88de562006-05-05 16:59:11 -0400530/**
531 * gfs2_readpages - Read a bunch of pages at once
532 *
533 * Some notes:
534 * 1. This is only for readahead, so we can simply ignore any things
535 * which are slightly inconvenient (such as locking conflicts between
536 * the page lock and the glock) and return having done no I/O. Its
537 * obviously not something we'd want to do on too regular a basis.
538 * Any I/O we ignore at this time will be done via readpage later.
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500539 * 2. We don't handle stuffed files here we let readpage do the honours.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400540 * 3. mpage_readpages() does most of the heavy lifting in the common case.
Bob Petersone9e1ef22007-12-10 14:13:27 -0600541 * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400542 */
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100543
Steven Whitehousefd88de562006-05-05 16:59:11 -0400544static int gfs2_readpages(struct file *file, struct address_space *mapping,
545 struct list_head *pages, unsigned nr_pages)
546{
547 struct inode *inode = mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400548 struct gfs2_inode *ip = GFS2_I(inode);
549 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400550 struct gfs2_holder gh;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100551 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400552
Steven Whitehouse719ee342008-09-18 13:53:59 +0100553 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
554 ret = gfs2_glock_nq(&gh);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100555 if (unlikely(ret))
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100556 goto out_uninit;
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500557 if (!gfs2_is_stuffed(ip))
Bob Petersone9e1ef22007-12-10 14:13:27 -0600558 ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100559 gfs2_glock_dq(&gh);
560out_uninit:
561 gfs2_holder_uninit(&gh);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400562 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
563 ret = -EIO;
564 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000565}
566
567/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700568 * gfs2_write_begin - Begin to write to a file
David Teiglandb3b94fa2006-01-16 16:50:04 +0000569 * @file: The file to write to
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700570 * @mapping: The mapping in which to write
571 * @pos: The file offset at which to start writing
572 * @len: Length of the write
573 * @flags: Various flags
574 * @pagep: Pointer to return the page
575 * @fsdata: Pointer to return fs data (unused by GFS2)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000576 *
577 * Returns: errno
578 */
579
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700580static int gfs2_write_begin(struct file *file, struct address_space *mapping,
581 loff_t pos, unsigned len, unsigned flags,
582 struct page **pagep, void **fsdata)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000583{
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700584 struct gfs2_inode *ip = GFS2_I(mapping->host);
585 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500586 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000587 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100588 unsigned requested = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000589 int alloc_required;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000590 int error = 0;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700591 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
592 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700593 struct page *page;
Russell Cattelan52ae7b72006-10-09 12:11:54 -0500594
Steven Whitehouse719ee342008-09-18 13:53:59 +0100595 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
596 error = gfs2_glock_nq(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700597 if (unlikely(error))
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000598 goto out_uninit;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500599 if (&ip->i_inode == sdp->sd_rindex) {
600 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
601 GL_NOCACHE, &m_ip->i_gh);
602 if (unlikely(error)) {
603 gfs2_glock_dq(&ip->i_gh);
604 goto out_uninit;
605 }
606 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000607
Bob Peterson461cb412010-06-24 19:21:20 -0400608 alloc_required = gfs2_write_alloc_required(ip, pos, len);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000609
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000610 if (alloc_required || gfs2_is_jdata(ip))
611 gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
612
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000613 if (alloc_required) {
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100614 struct gfs2_alloc_parms ap = { .aflags = 0, };
Steven Whitehoused82661d2008-03-10 15:34:50 +0000615 error = gfs2_quota_lock_check(ip);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000616 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -0400617 goto out_unlock;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000618
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100619 requested = data_blocks + ind_blocks;
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100620 ap.target = requested;
621 error = gfs2_inplace_reserve(ip, &ap);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000622 if (error)
623 goto out_qunlock;
624 }
625
626 rblocks = RES_DINODE + ind_blocks;
627 if (gfs2_is_jdata(ip))
628 rblocks += data_blocks ? data_blocks : 1;
629 if (ind_blocks || data_blocks)
630 rblocks += RES_STATFS + RES_QUOTA;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500631 if (&ip->i_inode == sdp->sd_rindex)
632 rblocks += 2 * RES_STATFS;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500633 if (alloc_required)
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100634 rblocks += gfs2_rg_blocks(ip, requested);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000635
Steven Whitehouse16615be2007-09-17 10:59:52 +0100636 error = gfs2_trans_begin(sdp, rblocks,
637 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000638 if (error)
Steven Whitehousea867bb22007-07-17 10:29:02 +0100639 goto out_trans_fail;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000640
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100641 error = -ENOMEM;
Steven Whitehousee4fefba2009-01-06 10:08:33 +0000642 flags |= AOP_FLAG_NOFS;
Nick Piggin54566b22009-01-04 12:00:53 -0800643 page = grab_cache_page_write_begin(mapping, index, flags);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100644 *pagep = page;
645 if (unlikely(!page))
646 goto out_endtrans;
647
David Teiglandb3b94fa2006-01-16 16:50:04 +0000648 if (gfs2_is_stuffed(ip)) {
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100649 error = 0;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700650 if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400651 error = gfs2_unstuff_dinode(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000652 if (error == 0)
653 goto prepare_write;
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100654 } else if (!PageUptodate(page)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000655 error = stuffed_readpage(ip, page);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100656 }
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000657 goto out;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000658 }
659
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000660prepare_write:
Christoph Hellwigebdec242010-10-06 10:47:23 +0200661 error = __block_write_begin(page, from, len, gfs2_block_map);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000662out:
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100663 if (error == 0)
664 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000665
Maxim6c474f72011-03-14 13:19:21 +0000666 unlock_page(page);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100667 page_cache_release(page);
npiggin@suse.de15c6fd92010-05-27 01:05:34 +1000668
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100669 gfs2_trans_end(sdp);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100670 if (pos + len > ip->i_inode.i_size)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100671 gfs2_trim_blocks(&ip->i_inode);
672 goto out_trans_fail;
673
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100674out_endtrans:
675 gfs2_trans_end(sdp);
676out_trans_fail:
677 if (alloc_required) {
678 gfs2_inplace_release(ip);
679out_qunlock:
680 gfs2_quota_unlock(ip);
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100681 }
682out_unlock:
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500683 if (&ip->i_inode == sdp->sd_rindex) {
684 gfs2_glock_dq(&m_ip->i_gh);
685 gfs2_holder_uninit(&m_ip->i_gh);
686 }
Steven Whitehousec41d4f02007-10-17 14:05:41 +0100687 gfs2_glock_dq(&ip->i_gh);
688out_uninit:
689 gfs2_holder_uninit(&ip->i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000690 return error;
691}
692
693/**
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500694 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
695 * @inode: the rindex inode
696 */
697static void adjust_fs_space(struct inode *inode)
698{
699 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500700 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
701 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500702 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
703 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500704 struct buffer_head *m_bh, *l_bh;
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500705 u64 fs_total, new_free;
706
707 /* Total up the file system space, according to the latest rindex. */
708 fs_total = gfs2_ri_total(sdp);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500709 if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
710 return;
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500711
712 spin_lock(&sdp->sd_statfs_spin);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500713 gfs2_statfs_change_in(m_sc, m_bh->b_data +
714 sizeof(struct gfs2_dinode));
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500715 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
716 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
717 else
718 new_free = 0;
719 spin_unlock(&sdp->sd_statfs_spin);
Robert Peterson6c532672007-05-10 16:54:38 -0500720 fs_warn(sdp, "File system extended by %llu blocks.\n",
721 (unsigned long long)new_free);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500722 gfs2_statfs_change(sdp, new_free, new_free, 0);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500723
724 if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0)
725 goto out;
726 update_statfs(sdp, m_bh, l_bh);
727 brelse(l_bh);
728out:
729 brelse(m_bh);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500730}
731
732/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700733 * gfs2_stuffed_write_end - Write end for stuffed files
734 * @inode: The inode
735 * @dibh: The buffer_head containing the on-disk inode
736 * @pos: The file position
737 * @len: The length of the write
738 * @copied: How much was actually copied by the VFS
739 * @page: The page
740 *
741 * This copies the data from the page into the inode block after
742 * the inode data structure itself.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000743 *
744 * Returns: errno
745 */
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700746static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
747 loff_t pos, unsigned len, unsigned copied,
748 struct page *page)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000749{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400750 struct gfs2_inode *ip = GFS2_I(inode);
751 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500752 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700753 u64 to = pos + copied;
754 void *kaddr;
755 unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000756
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700757 BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode)));
Cong Wangd9349282011-11-25 23:14:30 +0800758 kaddr = kmap_atomic(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700759 memcpy(buf + pos, kaddr + pos, copied);
760 memset(kaddr + pos + copied, 0, len - copied);
761 flush_dcache_page(page);
Cong Wangd9349282011-11-25 23:14:30 +0800762 kunmap_atomic(kaddr);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000763
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700764 if (!PageUptodate(page))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000765 SetPageUptodate(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700766 unlock_page(page);
767 page_cache_release(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000768
Abhijith Das7537d81a2009-05-12 11:16:20 -0500769 if (copied) {
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100770 if (inode->i_size < to)
Abhijith Das7537d81a2009-05-12 11:16:20 -0500771 i_size_write(inode, to);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700772 mark_inode_dirty(inode);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400773 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000774
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600775 if (inode == sdp->sd_rindex) {
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500776 adjust_fs_space(inode);
Bob Petersonca9248d2012-04-10 08:56:04 -0400777 sdp->sd_rindex_uptodate = 0;
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600778 }
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500779
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000780 brelse(dibh);
781 gfs2_trans_end(sdp);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500782 if (inode == sdp->sd_rindex) {
783 gfs2_glock_dq(&m_ip->i_gh);
784 gfs2_holder_uninit(&m_ip->i_gh);
785 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700786 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000787 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700788 return copied;
789}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000790
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700791/**
792 * gfs2_write_end
793 * @file: The file to write to
794 * @mapping: The address space to write to
795 * @pos: The file position
796 * @len: The length of the data
797 * @copied:
798 * @page: The page that has been written
799 * @fsdata: The fsdata (unused in GFS2)
800 *
801 * The main write_end function for GFS2. We have a separate one for
802 * stuffed files as they are slightly different, otherwise we just
803 * put our locking around the VFS provided functions.
804 *
805 * Returns: errno
806 */
807
808static int gfs2_write_end(struct file *file, struct address_space *mapping,
809 loff_t pos, unsigned len, unsigned copied,
810 struct page *page, void *fsdata)
811{
812 struct inode *inode = page->mapping->host;
813 struct gfs2_inode *ip = GFS2_I(inode);
814 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500815 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700816 struct buffer_head *dibh;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700817 unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
818 unsigned int to = from + len;
819 int ret;
Benjamin Marzinski0c901802013-09-03 16:59:42 -0500820 struct gfs2_trans *tr = current->journal_info;
821 BUG_ON(!tr);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700822
Steven Whitehouse7afd88d2008-02-22 16:07:18 +0000823 BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700824
825 ret = gfs2_meta_inode_buffer(ip, &dibh);
826 if (unlikely(ret)) {
827 unlock_page(page);
828 page_cache_release(page);
829 goto failed;
830 }
831
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700832 if (gfs2_is_stuffed(ip))
833 return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
834
Steven Whitehousebf36a712007-10-17 08:35:19 +0100835 if (!gfs2_is_writeback(ip))
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700836 gfs2_page_add_databufs(ip, page, from, to);
837
838 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
Benjamin Marzinski0c901802013-09-03 16:59:42 -0500839 if (tr->tr_num_buf_new)
840 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
841 else
842 gfs2_trans_add_meta(ip->i_gl, dibh);
843
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700844
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600845 if (inode == sdp->sd_rindex) {
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700846 adjust_fs_space(inode);
Bob Petersonca9248d2012-04-10 08:56:04 -0400847 sdp->sd_rindex_uptodate = 0;
Benjamin Marzinski9ae3c6d2009-11-10 12:54:56 -0600848 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700849
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000850 brelse(dibh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700851failed:
Bob Petersondeab72d2011-03-16 16:32:39 -0400852 gfs2_trans_end(sdp);
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100853 gfs2_inplace_release(ip);
Bob Peterson5407e242012-05-18 09:28:23 -0400854 if (ip->i_res->rs_qa_qd_num)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000855 gfs2_quota_unlock(ip);
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500856 if (inode == sdp->sd_rindex) {
857 gfs2_glock_dq(&m_ip->i_gh);
858 gfs2_holder_uninit(&m_ip->i_gh);
859 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700860 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000861 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700862 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000863}
864
865/**
Robert Peterson8fb68592007-06-12 11:24:36 -0500866 * gfs2_set_page_dirty - Page dirtying function
867 * @page: The page to dirty
868 *
869 * Returns: 1 if it dirtyed the page, or 0 otherwise
870 */
871
872static int gfs2_set_page_dirty(struct page *page)
873{
Steven Whitehouse55610932007-10-17 08:47:38 +0100874 SetPageChecked(page);
Robert Peterson8fb68592007-06-12 11:24:36 -0500875 return __set_page_dirty_buffers(page);
876}
877
878/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000879 * gfs2_bmap - Block map function
880 * @mapping: Address space info
881 * @lblock: The block to map
882 *
883 * Returns: The disk address for the block or 0 on hole or error
884 */
885
886static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
887{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400888 struct gfs2_inode *ip = GFS2_I(mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000889 struct gfs2_holder i_gh;
890 sector_t dblock = 0;
891 int error;
892
David Teiglandb3b94fa2006-01-16 16:50:04 +0000893 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
894 if (error)
895 return 0;
896
897 if (!gfs2_is_stuffed(ip))
Bob Petersone9e1ef22007-12-10 14:13:27 -0600898 dblock = generic_block_bmap(mapping, lblock, gfs2_block_map);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000899
900 gfs2_glock_dq_uninit(&i_gh);
901
902 return dblock;
903}
904
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100905static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
906{
907 struct gfs2_bufdata *bd;
908
909 lock_buffer(bh);
910 gfs2_log_lock(sdp);
911 clear_buffer_dirty(bh);
912 bd = bh->b_private;
913 if (bd) {
Bob Petersonc0752aa2012-05-01 12:00:34 -0400914 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
915 list_del_init(&bd->bd_list);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100916 else
917 gfs2_remove_from_journal(bh, current->journal_info, 0);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100918 }
919 bh->b_bdev = NULL;
920 clear_buffer_mapped(bh);
921 clear_buffer_req(bh);
922 clear_buffer_new(bh);
923 gfs2_log_unlock(sdp);
924 unlock_buffer(bh);
925}
926
Lukas Czernerd47992f2013-05-21 23:17:23 -0400927static void gfs2_invalidatepage(struct page *page, unsigned int offset,
928 unsigned int length)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000929{
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100930 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
Lukas Czerner5c0bb972013-05-21 23:58:49 -0400931 unsigned int stop = offset + length;
932 int partial_page = (offset || length < PAGE_CACHE_SIZE);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100933 struct buffer_head *bh, *head;
934 unsigned long pos = 0;
935
David Teiglandb3b94fa2006-01-16 16:50:04 +0000936 BUG_ON(!PageLocked(page));
Lukas Czerner5c0bb972013-05-21 23:58:49 -0400937 if (!partial_page)
Robert Peterson8fb68592007-06-12 11:24:36 -0500938 ClearPageChecked(page);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100939 if (!page_has_buffers(page))
940 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000941
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100942 bh = head = page_buffers(page);
943 do {
Lukas Czerner5c0bb972013-05-21 23:58:49 -0400944 if (pos + bh->b_size > stop)
945 return;
946
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100947 if (offset <= pos)
948 gfs2_discard(sdp, bh);
949 pos += bh->b_size;
950 bh = bh->b_this_page;
951 } while (bh != head);
952out:
Lukas Czerner5c0bb972013-05-21 23:58:49 -0400953 if (!partial_page)
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100954 try_to_release_page(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000955}
956
Steven Whitehousec7b33832006-12-14 18:24:26 +0000957/**
958 * gfs2_ok_for_dio - check that dio is valid on this file
959 * @ip: The inode
960 * @rw: READ or WRITE
961 * @offset: The offset at which we are reading or writing
962 *
963 * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
964 * 1 (to accept the i/o request)
965 */
966static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset)
967{
968 /*
969 * Should we return an error here? I can't see that O_DIRECT for
Steven Whitehouse55610932007-10-17 08:47:38 +0100970 * a stuffed file makes any sense. For now we'll silently fall
971 * back to buffered I/O
Steven Whitehousec7b33832006-12-14 18:24:26 +0000972 */
Steven Whitehousec7b33832006-12-14 18:24:26 +0000973 if (gfs2_is_stuffed(ip))
974 return 0;
975
Bob Petersonacb57a32008-09-11 15:35:37 -0400976 if (offset >= i_size_read(&ip->i_inode))
Steven Whitehousec7b33832006-12-14 18:24:26 +0000977 return 0;
978 return 1;
979}
980
981
982
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400983static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
984 const struct iovec *iov, loff_t offset,
985 unsigned long nr_segs)
Steven Whitehoused1665e42006-02-14 11:54:42 +0000986{
987 struct file *file = iocb->ki_filp;
988 struct inode *inode = file->f_mapping->host;
Steven Whitehousedfd11182013-12-18 14:14:52 +0000989 struct address_space *mapping = inode->i_mapping;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400990 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000991 struct gfs2_holder gh;
992 int rv;
993
994 /*
Steven Whitehousec7b33832006-12-14 18:24:26 +0000995 * Deferred lock, even if its a write, since we do no allocation
996 * on this path. All we need change is atime, and this lock mode
997 * ensures that other nodes have flushed their buffered read caches
998 * (i.e. their page cache entries for this inode). We do not,
999 * unfortunately have the option of only flushing a range like
1000 * the VFS does.
Steven Whitehoused1665e42006-02-14 11:54:42 +00001001 */
Steven Whitehouse719ee342008-09-18 13:53:59 +01001002 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
1003 rv = gfs2_glock_nq(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001004 if (rv)
Steven Whitehousec7b33832006-12-14 18:24:26 +00001005 return rv;
1006 rv = gfs2_ok_for_dio(ip, rw, offset);
1007 if (rv != 1)
1008 goto out; /* dio not valid, fall back to buffered i/o */
Steven Whitehoused1665e42006-02-14 11:54:42 +00001009
Steven Whitehousedfd11182013-12-18 14:14:52 +00001010 /*
1011 * Now since we are holding a deferred (CW) lock at this point, you
1012 * might be wondering why this is ever needed. There is a case however
1013 * where we've granted a deferred local lock against a cached exclusive
1014 * glock. That is ok provided all granted local locks are deferred, but
1015 * it also means that it is possible to encounter pages which are
1016 * cached and possibly also mapped. So here we check for that and sort
1017 * them out ahead of the dio. The glock state machine will take care of
1018 * everything else.
1019 *
1020 * If in fact the cached glock state (gl->gl_state) is deferred (CW) in
1021 * the first place, mapping->nr_pages will always be zero.
1022 */
1023 if (mapping->nrpages) {
1024 loff_t lstart = offset & (PAGE_CACHE_SIZE - 1);
1025 loff_t len = iov_length(iov, nr_segs);
1026 loff_t end = PAGE_ALIGN(offset + len) - 1;
1027
1028 rv = 0;
1029 if (len == 0)
1030 goto out;
1031 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
1032 unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len);
1033 rv = filemap_write_and_wait_range(mapping, lstart, end);
1034 if (rv)
Steven Whitehouse086352f2014-01-14 13:46:51 +00001035 goto out;
1036 if (rw == WRITE)
1037 truncate_inode_pages_range(mapping, lstart, end);
Steven Whitehousedfd11182013-12-18 14:14:52 +00001038 }
1039
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +02001040 rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
1041 offset, nr_segs, gfs2_get_block_direct,
1042 NULL, NULL, 0);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001043out:
Bob Peterson8e711e102012-08-09 12:48:42 -05001044 gfs2_glock_dq(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001045 gfs2_holder_uninit(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +00001046 return rv;
1047}
1048
1049/**
Steven Whitehouse623d9352006-08-31 12:14:44 -04001050 * gfs2_releasepage - free the metadata associated with a page
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001051 * @page: the page that's being released
1052 * @gfp_mask: passed from Linux VFS, ignored by us
1053 *
1054 * Call try_to_free_buffers() if the buffers in this page can be
1055 * released.
1056 *
1057 * Returns: 0
1058 */
1059
1060int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
1061{
Steven Whitehouse009d8512009-12-08 12:12:13 +00001062 struct address_space *mapping = page->mapping;
1063 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001064 struct buffer_head *bh, *head;
1065 struct gfs2_bufdata *bd;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001066
1067 if (!page_has_buffers(page))
Steven Whitehouse891ba6d2007-09-20 15:26:33 +01001068 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001069
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001070 gfs2_log_lock(sdp);
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001071 spin_lock(&sdp->sd_ail_lock);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001072 head = bh = page_buffers(page);
1073 do {
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001074 if (atomic_read(&bh->b_count))
1075 goto cannot_release;
1076 bd = bh->b_private;
Benjamin Marzinski16ca9412013-04-05 20:31:46 -05001077 if (bd && bd->bd_tr)
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001078 goto cannot_release;
Steven Whitehouse8f065d32011-05-03 11:49:19 +01001079 if (buffer_pinned(bh) || buffer_dirty(bh))
1080 goto not_possible;
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001081 bh = bh->b_this_page;
1082 } while(bh != head);
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001083 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001084
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001085 head = bh = page_buffers(page);
1086 do {
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001087 bd = bh->b_private;
1088 if (bd) {
1089 gfs2_assert_warn(sdp, bd->bd_bh == bh);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001090 if (!list_empty(&bd->bd_list))
1091 list_del_init(&bd->bd_list);
1092 bd->bd_bh = NULL;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001093 bh->b_private = NULL;
Steven Whitehouse623d9352006-08-31 12:14:44 -04001094 kmem_cache_free(gfs2_bufdata_cachep, bd);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001095 }
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001096
1097 bh = bh->b_this_page;
Steven Whitehouse166afcc2006-08-24 15:59:40 -04001098 } while (bh != head);
Steven Whitehousee4f29202013-11-26 13:21:08 +00001099 gfs2_log_unlock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001100
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001101 return try_to_free_buffers(page);
Steven Whitehouse8f065d32011-05-03 11:49:19 +01001102
1103not_possible: /* Should never happen */
1104 WARN_ON(buffer_dirty(bh));
1105 WARN_ON(buffer_pinned(bh));
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001106cannot_release:
Steven Whitehouse380f7c62011-07-14 08:59:44 +01001107 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehousebb3b0e32007-08-16 16:03:57 +01001108 gfs2_log_unlock(sdp);
1109 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001110}
1111
Steven Whitehouse55610932007-10-17 08:47:38 +01001112static const struct address_space_operations gfs2_writeback_aops = {
Steven Whitehouse9d358142013-08-27 21:22:07 +01001113 .writepage = gfs2_writepage,
Steven Whitehouse45138992013-01-28 09:30:07 +00001114 .writepages = gfs2_writepages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001115 .readpage = gfs2_readpage,
1116 .readpages = gfs2_readpages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001117 .write_begin = gfs2_write_begin,
1118 .write_end = gfs2_write_end,
1119 .bmap = gfs2_bmap,
1120 .invalidatepage = gfs2_invalidatepage,
1121 .releasepage = gfs2_releasepage,
1122 .direct_IO = gfs2_direct_IO,
Steven Whitehousee5d9dc22008-01-03 11:31:38 +00001123 .migratepage = buffer_migrate_page,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001124 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001125 .error_remove_page = generic_error_remove_page,
Steven Whitehouse55610932007-10-17 08:47:38 +01001126};
1127
1128static const struct address_space_operations gfs2_ordered_aops = {
Steven Whitehouse9d358142013-08-27 21:22:07 +01001129 .writepage = gfs2_writepage,
Steven Whitehouse45138992013-01-28 09:30:07 +00001130 .writepages = gfs2_writepages,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001131 .readpage = gfs2_readpage,
Steven Whitehousefd88de562006-05-05 16:59:11 -04001132 .readpages = gfs2_readpages,
Steven Whitehouse7765ec22007-10-16 01:25:07 -07001133 .write_begin = gfs2_write_begin,
1134 .write_end = gfs2_write_end,
Robert Peterson8fb68592007-06-12 11:24:36 -05001135 .set_page_dirty = gfs2_set_page_dirty,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001136 .bmap = gfs2_bmap,
1137 .invalidatepage = gfs2_invalidatepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001138 .releasepage = gfs2_releasepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001139 .direct_IO = gfs2_direct_IO,
Steven Whitehousee5d9dc22008-01-03 11:31:38 +00001140 .migratepage = buffer_migrate_page,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001141 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001142 .error_remove_page = generic_error_remove_page,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001143};
1144
Steven Whitehouse55610932007-10-17 08:47:38 +01001145static const struct address_space_operations gfs2_jdata_aops = {
Steven Whitehouse9ff8ec32007-09-28 13:49:05 +01001146 .writepage = gfs2_jdata_writepage,
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +01001147 .writepages = gfs2_jdata_writepages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001148 .readpage = gfs2_readpage,
1149 .readpages = gfs2_readpages,
Steven Whitehouse55610932007-10-17 08:47:38 +01001150 .write_begin = gfs2_write_begin,
1151 .write_end = gfs2_write_end,
1152 .set_page_dirty = gfs2_set_page_dirty,
1153 .bmap = gfs2_bmap,
1154 .invalidatepage = gfs2_invalidatepage,
1155 .releasepage = gfs2_releasepage,
Hisashi Hifumi229615d2009-03-03 11:45:20 +09001156 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02001157 .error_remove_page = generic_error_remove_page,
Steven Whitehouse55610932007-10-17 08:47:38 +01001158};
1159
1160void gfs2_set_aops(struct inode *inode)
1161{
1162 struct gfs2_inode *ip = GFS2_I(inode);
1163
1164 if (gfs2_is_writeback(ip))
1165 inode->i_mapping->a_ops = &gfs2_writeback_aops;
1166 else if (gfs2_is_ordered(ip))
1167 inode->i_mapping->a_ops = &gfs2_ordered_aops;
1168 else if (gfs2_is_jdata(ip))
1169 inode->i_mapping->a_ops = &gfs2_jdata_aops;
1170 else
1171 BUG();
1172}
1173