blob: 207014f363d8e26e5655e3e8b4f5ea91cbdf87a5 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Robert Peterson7ae8fa82007-05-09 09:37:57 -05003 * Copyright (C) 2004-2007 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>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020022#include <linux/lm_interface.h>
Steven Whitehouse51ff87b2007-10-15 14:42:35 +010023#include <linux/swap.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"
32#include "ops_address.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000033#include "quota.h"
34#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000035#include "rgrp.h"
Robert Petersoncd81a4b2007-05-14 12:42:18 -050036#include "super.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050037#include "util.h"
Steven Whitehouse4340fe62006-07-11 09:46:33 -040038#include "glops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000039
Steven Whitehouseba7f7292006-07-26 11:27:10 -040040
41static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
42 unsigned int from, unsigned int to)
43{
44 struct buffer_head *head = page_buffers(page);
45 unsigned int bsize = head->b_size;
46 struct buffer_head *bh;
47 unsigned int start, end;
48
49 for (bh = head, start = 0; bh != head || !start;
50 bh = bh->b_this_page, start = end) {
51 end = start + bsize;
52 if (end <= from || start >= to)
53 continue;
Benjamin Marzinskiddf4b422007-06-01 14:21:38 -050054 if (gfs2_is_jdata(ip))
55 set_buffer_uptodate(bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -040056 gfs2_trans_add_bh(ip->i_gl, bh, 0);
57 }
58}
59
David Teiglandb3b94fa2006-01-16 16:50:04 +000060/**
Steven Whitehouse4ff14672006-01-30 09:39:10 +000061 * gfs2_get_block - Fills in a buffer head with details about a block
David Teiglandb3b94fa2006-01-16 16:50:04 +000062 * @inode: The inode
63 * @lblock: The block number to look up
64 * @bh_result: The buffer head to return the result in
65 * @create: Non-zero if we may add block to the file
66 *
67 * Returns: errno
68 */
69
Steven Whitehouse4ff14672006-01-30 09:39:10 +000070int gfs2_get_block(struct inode *inode, sector_t lblock,
71 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000072{
Steven Whitehouse23591252006-10-13 17:25:45 -040073 return gfs2_block_map(inode, lblock, create, bh_result);
David Teiglandb3b94fa2006-01-16 16:50:04 +000074}
75
76/**
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040077 * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
David Teiglandb3b94fa2006-01-16 16:50:04 +000078 * @inode: The inode
79 * @lblock: The block number to look up
80 * @bh_result: The buffer head to return the result in
81 * @create: Non-zero if we may add block to the file
82 *
83 * Returns: errno
84 */
85
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040086static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
87 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000088{
David Teiglandb3b94fa2006-01-16 16:50:04 +000089 int error;
90
Steven Whitehouse23591252006-10-13 17:25:45 -040091 error = gfs2_block_map(inode, lblock, 0, bh_result);
David Teiglandb3b94fa2006-01-16 16:50:04 +000092 if (error)
93 return error;
Wendy Chengde986e82007-09-18 09:19:13 -040094 if (!buffer_mapped(bh_result))
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040095 return -EIO;
Steven Whitehouse623d9352006-08-31 12:14:44 -040096 return 0;
97}
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040098
99static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
100 struct buffer_head *bh_result, int create)
101{
Steven Whitehouse23591252006-10-13 17:25:45 -0400102 return gfs2_block_map(inode, lblock, 0, bh_result);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400103}
104
David Teiglandb3b94fa2006-01-16 16:50:04 +0000105/**
106 * gfs2_writepage - Write complete page
107 * @page: Page to write
108 *
109 * Returns: errno
110 *
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000111 * Some of this is copied from block_write_full_page() although we still
112 * call it to do most of the work.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000113 */
114
115static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
116{
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000117 struct inode *inode = page->mapping->host;
Steven Whitehousef4387142006-08-08 13:23:19 -0400118 struct gfs2_inode *ip = GFS2_I(inode);
119 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000120 loff_t i_size = i_size_read(inode);
121 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
122 unsigned offset;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000123 int error;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000124 int done_trans = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000125
David Teiglandb3b94fa2006-01-16 16:50:04 +0000126 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) {
127 unlock_page(page);
128 return -EIO;
129 }
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500130 if (current->journal_info)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000131 goto out_ignore;
132
133 /* Is the page fully outside i_size? (truncate in progress) */
134 offset = i_size & (PAGE_CACHE_SIZE-1);
Steven Whitehoused2d7b8a2006-05-02 12:09:42 -0400135 if (page->index > end_index || (page->index == end_index && !offset)) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000136 page->mapping->a_ops->invalidatepage(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000137 unlock_page(page);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000138 return 0; /* don't care */
139 }
140
Steven Whitehousebf36a712007-10-17 08:35:19 +0100141 if (PageChecked(page)) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000142 error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
143 if (error)
144 goto out_ignore;
Steven Whitehousebf36a712007-10-17 08:35:19 +0100145 ClearPageChecked(page);
Steven Whitehousef4387142006-08-08 13:23:19 -0400146 if (!page_has_buffers(page)) {
147 create_empty_buffers(page, inode->i_sb->s_blocksize,
148 (1 << BH_Dirty)|(1 << BH_Uptodate));
149 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000150 gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
151 done_trans = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000152 }
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400153 error = block_write_full_page(page, gfs2_get_block_noalloc, wbc);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000154 if (done_trans)
155 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000156 return error;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000157
158out_ignore:
159 redirty_page_for_writepage(wbc, page);
160 unlock_page(page);
161 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000162}
163
164/**
Steven Whitehouse55610932007-10-17 08:47:38 +0100165 * gfs2_writeback_writepages - Write a bunch of dirty pages back to disk
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000166 * @mapping: The mapping to write
167 * @wbc: Write-back control
168 *
Steven Whitehouse55610932007-10-17 08:47:38 +0100169 * For the data=writeback case we can already ignore buffer heads
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000170 * and write whole extents at once. This is a big reduction in the
171 * number of I/O requests we send and the bmap calls we make in this case.
172 */
Steven Whitehouse55610932007-10-17 08:47:38 +0100173static int gfs2_writeback_writepages(struct address_space *mapping,
174 struct writeback_control *wbc)
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000175{
Steven Whitehouse55610932007-10-17 08:47:38 +0100176 return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000177}
178
179/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000180 * stuffed_readpage - Fill in a Linux page with stuffed file data
181 * @ip: the inode
182 * @page: the page
183 *
184 * Returns: errno
185 */
186
187static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
188{
189 struct buffer_head *dibh;
190 void *kaddr;
191 int error;
192
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100193 /*
194 * Due to the order of unstuffing files and ->nopage(), we can be
195 * asked for a zero page in the case of a stuffed file being extended,
196 * so we need to supply one here. It doesn't happen often.
197 */
198 if (unlikely(page->index)) {
Steven Whitehouse28405012007-06-18 16:31:42 +0100199 zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100200 return 0;
201 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400202
David Teiglandb3b94fa2006-01-16 16:50:04 +0000203 error = gfs2_meta_inode_buffer(ip, &dibh);
204 if (error)
205 return error;
206
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000207 kaddr = kmap_atomic(page, KM_USER0);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400208 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
David Teiglandb3b94fa2006-01-16 16:50:04 +0000209 ip->i_di.di_size);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400210 memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size);
Russell Cattelanc312c4f2006-10-12 09:23:41 -0400211 kunmap_atomic(kaddr, KM_USER0);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100212 flush_dcache_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000213 brelse(dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000214 SetPageUptodate(page);
215
216 return 0;
217}
218
David Teiglandb3b94fa2006-01-16 16:50:04 +0000219
220/**
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100221 * __gfs2_readpage - readpage
222 * @file: The file to read a page for
David Teiglandb3b94fa2006-01-16 16:50:04 +0000223 * @page: The page to read
224 *
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100225 * This is the core of gfs2's readpage. Its used by the internal file
226 * reading code as in that case we already hold the glock. Also its
227 * called by gfs2_readpage() once the required lock has been granted.
228 *
229 */
230
231static int __gfs2_readpage(void *file, struct page *page)
232{
233 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
234 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
235 int error;
236
237 if (gfs2_is_stuffed(ip)) {
238 error = stuffed_readpage(ip, page);
239 unlock_page(page);
240 } else {
241 error = mpage_readpage(page, gfs2_get_block);
242 }
243
244 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
245 return -EIO;
246
247 return error;
248}
249
250/**
251 * gfs2_readpage - read a page of a file
252 * @file: The file to read
253 * @page: The page of the file
254 *
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100255 * This deals with the locking required. We use a trylock in order to
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100256 * avoid the page lock / glock ordering problems returning AOP_TRUNCATED_PAGE
257 * in the event that we are unable to get the lock.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000258 */
259
260static int gfs2_readpage(struct file *file, struct page *page)
261{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400262 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000263 struct gfs2_holder gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000264 int error;
265
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100266 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh);
267 error = gfs2_glock_nq_atime(&gh);
268 if (unlikely(error)) {
Steven Whitehousefd88de562006-05-05 16:59:11 -0400269 unlock_page(page);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100270 goto out;
Steven Whitehouse61a30dc2006-02-15 10:15:18 +0000271 }
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100272 error = __gfs2_readpage(file, page);
273 gfs2_glock_dq(&gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000274out:
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100275 gfs2_holder_uninit(&gh);
Josef Whitera13cbe32007-02-23 12:49:51 -0500276 if (error == GLR_TRYFAILED) {
Josef Whitera13cbe32007-02-23 12:49:51 -0500277 yield();
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100278 return AOP_TRUNCATED_PAGE;
Josef Whitera13cbe32007-02-23 12:49:51 -0500279 }
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100280 return error;
281}
282
283/**
284 * gfs2_internal_read - read an internal file
285 * @ip: The gfs2 inode
286 * @ra_state: The readahead state (or NULL for no readahead)
287 * @buf: The buffer to fill
288 * @pos: The file position
289 * @size: The amount to read
290 *
291 */
292
293int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
294 char *buf, loff_t *pos, unsigned size)
295{
296 struct address_space *mapping = ip->i_inode.i_mapping;
297 unsigned long index = *pos / PAGE_CACHE_SIZE;
298 unsigned offset = *pos & (PAGE_CACHE_SIZE - 1);
299 unsigned copied = 0;
300 unsigned amt;
301 struct page *page;
302 void *p;
303
304 do {
305 amt = size - copied;
306 if (offset + size > PAGE_CACHE_SIZE)
307 amt = PAGE_CACHE_SIZE - offset;
308 page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
309 if (IS_ERR(page))
310 return PTR_ERR(page);
311 p = kmap_atomic(page, KM_USER0);
312 memcpy(buf + copied, p + offset, amt);
313 kunmap_atomic(p, KM_USER0);
314 mark_page_accessed(page);
315 page_cache_release(page);
316 copied += amt;
317 index++;
318 offset = 0;
319 } while(copied < size);
320 (*pos) += size;
321 return size;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400322}
323
Steven Whitehousefd88de562006-05-05 16:59:11 -0400324/**
325 * gfs2_readpages - Read a bunch of pages at once
326 *
327 * Some notes:
328 * 1. This is only for readahead, so we can simply ignore any things
329 * which are slightly inconvenient (such as locking conflicts between
330 * the page lock and the glock) and return having done no I/O. Its
331 * obviously not something we'd want to do on too regular a basis.
332 * Any I/O we ignore at this time will be done via readpage later.
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500333 * 2. We don't handle stuffed files here we let readpage do the honours.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400334 * 3. mpage_readpages() does most of the heavy lifting in the common case.
335 * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400336 */
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100337
Steven Whitehousefd88de562006-05-05 16:59:11 -0400338static int gfs2_readpages(struct file *file, struct address_space *mapping,
339 struct list_head *pages, unsigned nr_pages)
340{
341 struct inode *inode = mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400342 struct gfs2_inode *ip = GFS2_I(inode);
343 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400344 struct gfs2_holder gh;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100345 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400346
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100347 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100348 ret = gfs2_glock_nq_atime(&gh);
Steven Whitehouse51ff87b2007-10-15 14:42:35 +0100349 if (unlikely(ret))
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100350 goto out_uninit;
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500351 if (!gfs2_is_stuffed(ip))
Steven Whitehousefd88de562006-05-05 16:59:11 -0400352 ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100353 gfs2_glock_dq(&gh);
354out_uninit:
355 gfs2_holder_uninit(&gh);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400356 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
357 ret = -EIO;
358 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000359}
360
361/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700362 * gfs2_write_begin - Begin to write to a file
David Teiglandb3b94fa2006-01-16 16:50:04 +0000363 * @file: The file to write to
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700364 * @mapping: The mapping in which to write
365 * @pos: The file offset at which to start writing
366 * @len: Length of the write
367 * @flags: Various flags
368 * @pagep: Pointer to return the page
369 * @fsdata: Pointer to return fs data (unused by GFS2)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000370 *
371 * Returns: errno
372 */
373
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700374static int gfs2_write_begin(struct file *file, struct address_space *mapping,
375 loff_t pos, unsigned len, unsigned flags,
376 struct page **pagep, void **fsdata)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000377{
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700378 struct gfs2_inode *ip = GFS2_I(mapping->host);
379 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000380 unsigned int data_blocks, ind_blocks, rblocks;
381 int alloc_required;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000382 int error = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000383 struct gfs2_alloc *al;
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700384 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
385 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
386 unsigned to = from + len;
387 struct page *page;
Russell Cattelan52ae7b72006-10-09 12:11:54 -0500388
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700389 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &ip->i_gh);
Steven Whitehousedcd24792006-11-16 11:08:16 -0500390 error = gfs2_glock_nq_atime(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700391 if (unlikely(error))
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000392 goto out_uninit;
393
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700394 error = -ENOMEM;
395 page = __grab_cache_page(mapping, index);
396 *pagep = page;
397 if (!page)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000398 goto out_unlock;
399
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700400 gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
401
402 error = gfs2_write_alloc_required(ip, pos, len, &alloc_required);
403 if (error)
404 goto out_putpage;
405
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000406
Steven Whitehousef5c54802006-10-10 13:45:15 -0400407 ip->i_alloc.al_requested = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000408 if (alloc_required) {
409 al = gfs2_alloc_get(ip);
410
411 error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
412 if (error)
413 goto out_alloc_put;
414
Steven Whitehouse2933f922006-11-01 13:23:29 -0500415 error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000416 if (error)
417 goto out_qunlock;
418
419 al->al_requested = data_blocks + ind_blocks;
420 error = gfs2_inplace_reserve(ip);
421 if (error)
422 goto out_qunlock;
423 }
424
425 rblocks = RES_DINODE + ind_blocks;
426 if (gfs2_is_jdata(ip))
427 rblocks += data_blocks ? data_blocks : 1;
428 if (ind_blocks || data_blocks)
429 rblocks += RES_STATFS + RES_QUOTA;
430
Steven Whitehouse16615be2007-09-17 10:59:52 +0100431 error = gfs2_trans_begin(sdp, rblocks,
432 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000433 if (error)
Steven Whitehousea867bb22007-07-17 10:29:02 +0100434 goto out_trans_fail;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000435
436 if (gfs2_is_stuffed(ip)) {
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700437 if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400438 error = gfs2_unstuff_dinode(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000439 if (error == 0)
440 goto prepare_write;
441 } else if (!PageUptodate(page))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000442 error = stuffed_readpage(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000443 goto out;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000444 }
445
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000446prepare_write:
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000447 error = block_prepare_write(page, from, to, gfs2_get_block);
448
449out:
450 if (error) {
451 gfs2_trans_end(sdp);
Steven Whitehousea867bb22007-07-17 10:29:02 +0100452out_trans_fail:
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000453 if (alloc_required) {
454 gfs2_inplace_release(ip);
455out_qunlock:
456 gfs2_quota_unlock(ip);
457out_alloc_put:
458 gfs2_alloc_put(ip);
459 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700460out_putpage:
461 page_cache_release(page);
462 if (pos + len > ip->i_inode.i_size)
463 vmtruncate(&ip->i_inode, ip->i_inode.i_size);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000464out_unlock:
465 gfs2_glock_dq_m(1, &ip->i_gh);
466out_uninit:
467 gfs2_holder_uninit(&ip->i_gh);
468 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000469
470 return error;
471}
472
473/**
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500474 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
475 * @inode: the rindex inode
476 */
477static void adjust_fs_space(struct inode *inode)
478{
479 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
480 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
481 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
482 u64 fs_total, new_free;
483
484 /* Total up the file system space, according to the latest rindex. */
485 fs_total = gfs2_ri_total(sdp);
486
487 spin_lock(&sdp->sd_statfs_spin);
488 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
489 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
490 else
491 new_free = 0;
492 spin_unlock(&sdp->sd_statfs_spin);
Robert Peterson6c532672007-05-10 16:54:38 -0500493 fs_warn(sdp, "File system extended by %llu blocks.\n",
494 (unsigned long long)new_free);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500495 gfs2_statfs_change(sdp, new_free, new_free, 0);
496}
497
498/**
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700499 * gfs2_stuffed_write_end - Write end for stuffed files
500 * @inode: The inode
501 * @dibh: The buffer_head containing the on-disk inode
502 * @pos: The file position
503 * @len: The length of the write
504 * @copied: How much was actually copied by the VFS
505 * @page: The page
506 *
507 * This copies the data from the page into the inode block after
508 * the inode data structure itself.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000509 *
510 * Returns: errno
511 */
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700512static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
513 loff_t pos, unsigned len, unsigned copied,
514 struct page *page)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000515{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400516 struct gfs2_inode *ip = GFS2_I(inode);
517 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700518 u64 to = pos + copied;
519 void *kaddr;
520 unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode);
521 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000522
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700523 BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode)));
524 kaddr = kmap_atomic(page, KM_USER0);
525 memcpy(buf + pos, kaddr + pos, copied);
526 memset(kaddr + pos + copied, 0, len - copied);
527 flush_dcache_page(page);
528 kunmap_atomic(kaddr, KM_USER0);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000529
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700530 if (!PageUptodate(page))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000531 SetPageUptodate(page);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700532 unlock_page(page);
533 page_cache_release(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000534
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700535 if (inode->i_size < to) {
536 i_size_write(inode, to);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000537 ip->i_di.di_size = inode->i_size;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400538 di->di_size = cpu_to_be64(inode->i_size);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700539 mark_inode_dirty(inode);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400540 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000541
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500542 if (inode == sdp->sd_rindex)
543 adjust_fs_space(inode);
544
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000545 brelse(dibh);
546 gfs2_trans_end(sdp);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700547 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000548 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700549 return copied;
550}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000551
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700552/**
553 * gfs2_write_end
554 * @file: The file to write to
555 * @mapping: The address space to write to
556 * @pos: The file position
557 * @len: The length of the data
558 * @copied:
559 * @page: The page that has been written
560 * @fsdata: The fsdata (unused in GFS2)
561 *
562 * The main write_end function for GFS2. We have a separate one for
563 * stuffed files as they are slightly different, otherwise we just
564 * put our locking around the VFS provided functions.
565 *
566 * Returns: errno
567 */
568
569static int gfs2_write_end(struct file *file, struct address_space *mapping,
570 loff_t pos, unsigned len, unsigned copied,
571 struct page *page, void *fsdata)
572{
573 struct inode *inode = page->mapping->host;
574 struct gfs2_inode *ip = GFS2_I(inode);
575 struct gfs2_sbd *sdp = GFS2_SB(inode);
576 struct buffer_head *dibh;
577 struct gfs2_alloc *al = &ip->i_alloc;
578 struct gfs2_dinode *di;
579 unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
580 unsigned int to = from + len;
581 int ret;
582
583 BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == 0);
584
585 ret = gfs2_meta_inode_buffer(ip, &dibh);
586 if (unlikely(ret)) {
587 unlock_page(page);
588 page_cache_release(page);
589 goto failed;
590 }
591
592 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
593
594 if (gfs2_is_stuffed(ip))
595 return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
596
Steven Whitehousebf36a712007-10-17 08:35:19 +0100597 if (!gfs2_is_writeback(ip))
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700598 gfs2_page_add_databufs(ip, page, from, to);
599
600 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
601
602 if (likely(ret >= 0)) {
603 copied = ret;
604 if ((pos + copied) > inode->i_size) {
605 di = (struct gfs2_dinode *)dibh->b_data;
606 ip->i_di.di_size = inode->i_size;
607 di->di_size = cpu_to_be64(inode->i_size);
608 mark_inode_dirty(inode);
609 }
610 }
611
612 if (inode == sdp->sd_rindex)
613 adjust_fs_space(inode);
614
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000615 brelse(dibh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000616 gfs2_trans_end(sdp);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700617failed:
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000618 if (al->al_requested) {
619 gfs2_inplace_release(ip);
620 gfs2_quota_unlock(ip);
621 gfs2_alloc_put(ip);
622 }
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700623 gfs2_glock_dq(&ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000624 gfs2_holder_uninit(&ip->i_gh);
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700625 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000626}
627
628/**
Robert Peterson8fb68592007-06-12 11:24:36 -0500629 * gfs2_set_page_dirty - Page dirtying function
630 * @page: The page to dirty
631 *
632 * Returns: 1 if it dirtyed the page, or 0 otherwise
633 */
634
635static int gfs2_set_page_dirty(struct page *page)
636{
Steven Whitehouse55610932007-10-17 08:47:38 +0100637 SetPageChecked(page);
Robert Peterson8fb68592007-06-12 11:24:36 -0500638 return __set_page_dirty_buffers(page);
639}
640
641/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000642 * gfs2_bmap - Block map function
643 * @mapping: Address space info
644 * @lblock: The block to map
645 *
646 * Returns: The disk address for the block or 0 on hole or error
647 */
648
649static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
650{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400651 struct gfs2_inode *ip = GFS2_I(mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000652 struct gfs2_holder i_gh;
653 sector_t dblock = 0;
654 int error;
655
David Teiglandb3b94fa2006-01-16 16:50:04 +0000656 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
657 if (error)
658 return 0;
659
660 if (!gfs2_is_stuffed(ip))
Steven Whitehouse4ff14672006-01-30 09:39:10 +0000661 dblock = generic_block_bmap(mapping, lblock, gfs2_get_block);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000662
663 gfs2_glock_dq_uninit(&i_gh);
664
665 return dblock;
666}
667
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100668static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
669{
670 struct gfs2_bufdata *bd;
671
672 lock_buffer(bh);
673 gfs2_log_lock(sdp);
674 clear_buffer_dirty(bh);
675 bd = bh->b_private;
676 if (bd) {
Steven Whitehouse16615be2007-09-17 10:59:52 +0100677 if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh))
678 list_del_init(&bd->bd_le.le_list);
679 else
680 gfs2_remove_from_journal(bh, current->journal_info, 0);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100681 }
682 bh->b_bdev = NULL;
683 clear_buffer_mapped(bh);
684 clear_buffer_req(bh);
685 clear_buffer_new(bh);
686 gfs2_log_unlock(sdp);
687 unlock_buffer(bh);
688}
689
Steven Whitehouse8628de02006-03-31 16:48:41 -0500690static void gfs2_invalidatepage(struct page *page, unsigned long offset)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000691{
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100692 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
693 struct buffer_head *bh, *head;
694 unsigned long pos = 0;
695
David Teiglandb3b94fa2006-01-16 16:50:04 +0000696 BUG_ON(!PageLocked(page));
Robert Peterson8fb68592007-06-12 11:24:36 -0500697 if (offset == 0)
698 ClearPageChecked(page);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100699 if (!page_has_buffers(page))
700 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000701
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100702 bh = head = page_buffers(page);
703 do {
704 if (offset <= pos)
705 gfs2_discard(sdp, bh);
706 pos += bh->b_size;
707 bh = bh->b_this_page;
708 } while (bh != head);
709out:
710 if (offset == 0)
711 try_to_release_page(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000712}
713
Steven Whitehousec7b33832006-12-14 18:24:26 +0000714/**
715 * gfs2_ok_for_dio - check that dio is valid on this file
716 * @ip: The inode
717 * @rw: READ or WRITE
718 * @offset: The offset at which we are reading or writing
719 *
720 * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
721 * 1 (to accept the i/o request)
722 */
723static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset)
724{
725 /*
726 * Should we return an error here? I can't see that O_DIRECT for
Steven Whitehouse55610932007-10-17 08:47:38 +0100727 * a stuffed file makes any sense. For now we'll silently fall
728 * back to buffered I/O
Steven Whitehousec7b33832006-12-14 18:24:26 +0000729 */
Steven Whitehousec7b33832006-12-14 18:24:26 +0000730 if (gfs2_is_stuffed(ip))
731 return 0;
732
733 if (offset > i_size_read(&ip->i_inode))
734 return 0;
735 return 1;
736}
737
738
739
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400740static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
741 const struct iovec *iov, loff_t offset,
742 unsigned long nr_segs)
Steven Whitehoused1665e42006-02-14 11:54:42 +0000743{
744 struct file *file = iocb->ki_filp;
745 struct inode *inode = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400746 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000747 struct gfs2_holder gh;
748 int rv;
749
750 /*
Steven Whitehousec7b33832006-12-14 18:24:26 +0000751 * Deferred lock, even if its a write, since we do no allocation
752 * on this path. All we need change is atime, and this lock mode
753 * ensures that other nodes have flushed their buffered read caches
754 * (i.e. their page cache entries for this inode). We do not,
755 * unfortunately have the option of only flushing a range like
756 * the VFS does.
Steven Whitehoused1665e42006-02-14 11:54:42 +0000757 */
Steven Whitehousec7b33832006-12-14 18:24:26 +0000758 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, GL_ATIME, &gh);
Steven Whitehousedcd24792006-11-16 11:08:16 -0500759 rv = gfs2_glock_nq_atime(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000760 if (rv)
Steven Whitehousec7b33832006-12-14 18:24:26 +0000761 return rv;
762 rv = gfs2_ok_for_dio(ip, rw, offset);
763 if (rv != 1)
764 goto out; /* dio not valid, fall back to buffered i/o */
Steven Whitehoused1665e42006-02-14 11:54:42 +0000765
Steven Whitehousec7b33832006-12-14 18:24:26 +0000766 rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev,
767 iov, offset, nr_segs,
768 gfs2_get_block_direct, NULL);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000769out:
770 gfs2_glock_dq_m(1, &gh);
771 gfs2_holder_uninit(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000772 return rv;
773}
774
775/**
Steven Whitehouse623d9352006-08-31 12:14:44 -0400776 * gfs2_releasepage - free the metadata associated with a page
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400777 * @page: the page that's being released
778 * @gfp_mask: passed from Linux VFS, ignored by us
779 *
780 * Call try_to_free_buffers() if the buffers in this page can be
781 * released.
782 *
783 * Returns: 0
784 */
785
786int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
787{
788 struct inode *aspace = page->mapping->host;
789 struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info;
790 struct buffer_head *bh, *head;
791 struct gfs2_bufdata *bd;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400792
793 if (!page_has_buffers(page))
Steven Whitehouse891ba6d2007-09-20 15:26:33 +0100794 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400795
Steven Whitehousebb3b0e32007-08-16 16:03:57 +0100796 gfs2_log_lock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400797 head = bh = page_buffers(page);
798 do {
Steven Whitehousebb3b0e32007-08-16 16:03:57 +0100799 if (atomic_read(&bh->b_count))
800 goto cannot_release;
801 bd = bh->b_private;
802 if (bd && bd->bd_ail)
803 goto cannot_release;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400804 gfs2_assert_warn(sdp, !buffer_pinned(bh));
Steven Whitehouse623d9352006-08-31 12:14:44 -0400805 gfs2_assert_warn(sdp, !buffer_dirty(bh));
Steven Whitehousebb3b0e32007-08-16 16:03:57 +0100806 bh = bh->b_this_page;
807 } while(bh != head);
808 gfs2_log_unlock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400809
Steven Whitehousebb3b0e32007-08-16 16:03:57 +0100810 head = bh = page_buffers(page);
811 do {
Steven Whitehouse623d9352006-08-31 12:14:44 -0400812 gfs2_log_lock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400813 bd = bh->b_private;
814 if (bd) {
815 gfs2_assert_warn(sdp, bd->bd_bh == bh);
816 gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr));
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100817 if (!list_empty(&bd->bd_le.le_list)) {
818 if (!buffer_pinned(bh))
819 list_del_init(&bd->bd_le.le_list);
820 else
821 bd = NULL;
822 }
823 if (bd)
824 bd->bd_bh = NULL;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400825 bh->b_private = NULL;
826 }
Steven Whitehouse623d9352006-08-31 12:14:44 -0400827 gfs2_log_unlock(sdp);
828 if (bd)
829 kmem_cache_free(gfs2_bufdata_cachep, bd);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400830
831 bh = bh->b_this_page;
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400832 } while (bh != head);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400833
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400834 return try_to_free_buffers(page);
Steven Whitehousebb3b0e32007-08-16 16:03:57 +0100835cannot_release:
836 gfs2_log_unlock(sdp);
837 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400838}
839
Steven Whitehouse55610932007-10-17 08:47:38 +0100840static const struct address_space_operations gfs2_writeback_aops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000841 .writepage = gfs2_writepage,
Steven Whitehouse55610932007-10-17 08:47:38 +0100842 .writepages = gfs2_writeback_writepages,
843 .readpage = gfs2_readpage,
844 .readpages = gfs2_readpages,
845 .sync_page = block_sync_page,
846 .write_begin = gfs2_write_begin,
847 .write_end = gfs2_write_end,
848 .bmap = gfs2_bmap,
849 .invalidatepage = gfs2_invalidatepage,
850 .releasepage = gfs2_releasepage,
851 .direct_IO = gfs2_direct_IO,
852};
853
854static const struct address_space_operations gfs2_ordered_aops = {
855 .writepage = gfs2_writepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000856 .readpage = gfs2_readpage,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400857 .readpages = gfs2_readpages,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000858 .sync_page = block_sync_page,
Steven Whitehouse7765ec22007-10-16 01:25:07 -0700859 .write_begin = gfs2_write_begin,
860 .write_end = gfs2_write_end,
Robert Peterson8fb68592007-06-12 11:24:36 -0500861 .set_page_dirty = gfs2_set_page_dirty,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000862 .bmap = gfs2_bmap,
863 .invalidatepage = gfs2_invalidatepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400864 .releasepage = gfs2_releasepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000865 .direct_IO = gfs2_direct_IO,
866};
867
Steven Whitehouse55610932007-10-17 08:47:38 +0100868static const struct address_space_operations gfs2_jdata_aops = {
869 .writepage = gfs2_writepage,
870 .readpage = gfs2_readpage,
871 .readpages = gfs2_readpages,
872 .sync_page = block_sync_page,
873 .write_begin = gfs2_write_begin,
874 .write_end = gfs2_write_end,
875 .set_page_dirty = gfs2_set_page_dirty,
876 .bmap = gfs2_bmap,
877 .invalidatepage = gfs2_invalidatepage,
878 .releasepage = gfs2_releasepage,
879};
880
881void gfs2_set_aops(struct inode *inode)
882{
883 struct gfs2_inode *ip = GFS2_I(inode);
884
885 if (gfs2_is_writeback(ip))
886 inode->i_mapping->a_ops = &gfs2_writeback_aops;
887 else if (gfs2_is_ordered(ip))
888 inode->i_mapping->a_ops = &gfs2_ordered_aops;
889 else if (gfs2_is_jdata(ip))
890 inode->i_mapping->a_ops = &gfs2_jdata_aops;
891 else
892 BUG();
893}
894