blob: 26c888890c245bf562931a2ddd54619ac582d36c [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 Whitehouse5c676f62006-02-27 17:23:27 -050020#include <linux/gfs2_ondisk.h>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020021#include <linux/lm_interface.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000022
23#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050024#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000025#include "bmap.h"
26#include "glock.h"
27#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000028#include "log.h"
29#include "meta_io.h"
30#include "ops_address.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000031#include "quota.h"
32#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000033#include "rgrp.h"
Steven Whitehouse61a30dc2006-02-15 10:15:18 +000034#include "ops_file.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
40static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
41 unsigned int from, unsigned int to)
42{
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 Whitehouseba7f7292006-07-26 11:27:10 -040055 gfs2_trans_add_bh(ip->i_gl, bh, 0);
56 }
57}
58
David Teiglandb3b94fa2006-01-16 16:50:04 +000059/**
Steven Whitehouse4ff14672006-01-30 09:39:10 +000060 * gfs2_get_block - 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 Whitehouse4ff14672006-01-30 09:39:10 +000069int gfs2_get_block(struct inode *inode, sector_t lblock,
70 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000071{
Steven Whitehouse23591252006-10-13 17:25:45 -040072 return gfs2_block_map(inode, lblock, create, bh_result);
David Teiglandb3b94fa2006-01-16 16:50:04 +000073}
74
75/**
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040076 * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
David Teiglandb3b94fa2006-01-16 16:50:04 +000077 * @inode: The inode
78 * @lblock: The block number to look up
79 * @bh_result: The buffer head to return the result in
80 * @create: Non-zero if we may add block to the file
81 *
82 * Returns: errno
83 */
84
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040085static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
86 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000087{
David Teiglandb3b94fa2006-01-16 16:50:04 +000088 int error;
89
Steven Whitehouse23591252006-10-13 17:25:45 -040090 error = gfs2_block_map(inode, lblock, 0, bh_result);
David Teiglandb3b94fa2006-01-16 16:50:04 +000091 if (error)
92 return error;
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040093 if (bh_result->b_blocknr == 0)
94 return -EIO;
Steven Whitehouse623d9352006-08-31 12:14:44 -040095 return 0;
96}
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040097
98static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
99 struct buffer_head *bh_result, int create)
100{
Steven Whitehouse23591252006-10-13 17:25:45 -0400101 return gfs2_block_map(inode, lblock, 0, bh_result);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400102}
103
David Teiglandb3b94fa2006-01-16 16:50:04 +0000104/**
105 * gfs2_writepage - Write complete page
106 * @page: Page to write
107 *
108 * Returns: errno
109 *
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000110 * Some of this is copied from block_write_full_page() although we still
111 * call it to do most of the work.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000112 */
113
114static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
115{
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000116 struct inode *inode = page->mapping->host;
Steven Whitehousef4387142006-08-08 13:23:19 -0400117 struct gfs2_inode *ip = GFS2_I(inode);
118 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000119 loff_t i_size = i_size_read(inode);
120 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
121 unsigned offset;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000122 int error;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000123 int done_trans = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000124
David Teiglandb3b94fa2006-01-16 16:50:04 +0000125 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) {
126 unlock_page(page);
127 return -EIO;
128 }
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500129 if (current->journal_info)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000130 goto out_ignore;
131
132 /* Is the page fully outside i_size? (truncate in progress) */
133 offset = i_size & (PAGE_CACHE_SIZE-1);
Steven Whitehoused2d7b8a2006-05-02 12:09:42 -0400134 if (page->index > end_index || (page->index == end_index && !offset)) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000135 page->mapping->a_ops->invalidatepage(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000136 unlock_page(page);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000137 return 0; /* don't care */
138 }
139
Robert Peterson8fb68592007-06-12 11:24:36 -0500140 if ((sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) &&
141 PageChecked(page)) {
142 ClearPageChecked(page);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000143 error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
144 if (error)
145 goto out_ignore;
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 gfs2_meta_cache_flush(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000157 return error;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000158
159out_ignore:
160 redirty_page_for_writepage(wbc, page);
161 unlock_page(page);
162 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000163}
164
165/**
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000166 * gfs2_writepages - Write a bunch of dirty pages back to disk
167 * @mapping: The mapping to write
168 * @wbc: Write-back control
169 *
170 * For journaled files and/or ordered writes this just falls back to the
171 * kernel's default writepages path for now. We will probably want to change
172 * that eventually (i.e. when we look at allocate on flush).
173 *
174 * For the data=writeback case though we can already ignore buffer heads
175 * and write whole extents at once. This is a big reduction in the
176 * number of I/O requests we send and the bmap calls we make in this case.
177 */
Adrian Bunka2cf8222007-02-06 23:12:49 +0100178static int gfs2_writepages(struct address_space *mapping,
179 struct writeback_control *wbc)
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000180{
181 struct inode *inode = mapping->host;
182 struct gfs2_inode *ip = GFS2_I(inode);
183 struct gfs2_sbd *sdp = GFS2_SB(inode);
184
185 if (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK && !gfs2_is_jdata(ip))
186 return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
187
188 return generic_writepages(mapping, wbc);
189}
190
191/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000192 * stuffed_readpage - Fill in a Linux page with stuffed file data
193 * @ip: the inode
194 * @page: the page
195 *
196 * Returns: errno
197 */
198
199static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
200{
201 struct buffer_head *dibh;
202 void *kaddr;
203 int error;
204
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100205 /*
206 * Due to the order of unstuffing files and ->nopage(), we can be
207 * asked for a zero page in the case of a stuffed file being extended,
208 * so we need to supply one here. It doesn't happen often.
209 */
210 if (unlikely(page->index)) {
Steven Whitehouse28405012007-06-18 16:31:42 +0100211 zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100212 return 0;
213 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400214
David Teiglandb3b94fa2006-01-16 16:50:04 +0000215 error = gfs2_meta_inode_buffer(ip, &dibh);
216 if (error)
217 return error;
218
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000219 kaddr = kmap_atomic(page, KM_USER0);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400220 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
David Teiglandb3b94fa2006-01-16 16:50:04 +0000221 ip->i_di.di_size);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400222 memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size);
Russell Cattelanc312c4f2006-10-12 09:23:41 -0400223 kunmap_atomic(kaddr, KM_USER0);
Steven Whitehousebf126ae2007-04-20 09:18:30 +0100224 flush_dcache_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000225 brelse(dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000226 SetPageUptodate(page);
227
228 return 0;
229}
230
David Teiglandb3b94fa2006-01-16 16:50:04 +0000231
232/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000233 * gfs2_readpage - readpage with locking
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000234 * @file: The file to read a page for. N.B. This may be NULL if we are
235 * reading an internal file.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000236 * @page: The page to read
237 *
238 * Returns: errno
239 */
240
241static int gfs2_readpage(struct file *file, struct page *page)
242{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400243 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
244 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
Russell Cattelandc41aee2006-09-18 17:26:48 -0400245 struct gfs2_file *gf = NULL;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000246 struct gfs2_holder gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000247 int error;
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400248 int do_unlock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000249
Steven Whitehousedd538c82006-09-04 14:53:30 -0400250 if (likely(file != &gfs2_internal_file_sentinel)) {
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400251 if (file) {
Russell Cattelandc41aee2006-09-18 17:26:48 -0400252 gf = file->private_data;
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400253 if (test_bit(GFF_EXLOCK, &gf->f_flags))
Russell Cattelandc41aee2006-09-18 17:26:48 -0400254 /* gfs2_sharewrite_nopage has grabbed the ip->i_gl already */
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400255 goto skip_lock;
256 }
Steven Whitehouse2ca99502006-11-08 10:26:54 -0500257 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh);
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400258 do_unlock = 1;
Steven Whitehousedcd24792006-11-16 11:08:16 -0500259 error = gfs2_glock_nq_atime(&gh);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400260 if (unlikely(error))
Steven Whitehouse61a30dc2006-02-15 10:15:18 +0000261 goto out_unlock;
262 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000263
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400264skip_lock:
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000265 if (gfs2_is_stuffed(ip)) {
Steven Whitehousefd88de562006-05-05 16:59:11 -0400266 error = stuffed_readpage(ip, page);
267 unlock_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000268 } else
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000269 error = mpage_readpage(page, gfs2_get_block);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000270
271 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
272 error = -EIO;
273
Steven Whitehouse07903c02006-09-18 17:30:05 -0400274 if (do_unlock) {
Steven Whitehouse61a30dc2006-02-15 10:15:18 +0000275 gfs2_glock_dq_m(1, &gh);
276 gfs2_holder_uninit(&gh);
277 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000278out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000279 return error;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000280out_unlock:
281 unlock_page(page);
Josef Whitera13cbe32007-02-23 12:49:51 -0500282 if (error == GLR_TRYFAILED) {
283 error = AOP_TRUNCATED_PAGE;
284 yield();
285 }
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400286 if (do_unlock)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400287 gfs2_holder_uninit(&gh);
288 goto out;
289}
290
Steven Whitehousefd88de562006-05-05 16:59:11 -0400291/**
292 * gfs2_readpages - Read a bunch of pages at once
293 *
294 * Some notes:
295 * 1. This is only for readahead, so we can simply ignore any things
296 * which are slightly inconvenient (such as locking conflicts between
297 * the page lock and the glock) and return having done no I/O. Its
298 * obviously not something we'd want to do on too regular a basis.
299 * Any I/O we ignore at this time will be done via readpage later.
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500300 * 2. We don't handle stuffed files here we let readpage do the honours.
Steven Whitehousefd88de562006-05-05 16:59:11 -0400301 * 3. mpage_readpages() does most of the heavy lifting in the common case.
302 * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places.
303 * 5. We use LM_FLAG_TRY_1CB here, effectively we then have lock-ahead as
304 * well as read-ahead.
305 */
306static int gfs2_readpages(struct file *file, struct address_space *mapping,
307 struct list_head *pages, unsigned nr_pages)
308{
309 struct inode *inode = mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400310 struct gfs2_inode *ip = GFS2_I(inode);
311 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400312 struct gfs2_holder gh;
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500313 int ret = 0;
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400314 int do_unlock = 0;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400315
Steven Whitehousedd538c82006-09-04 14:53:30 -0400316 if (likely(file != &gfs2_internal_file_sentinel)) {
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400317 if (file) {
318 struct gfs2_file *gf = file->private_data;
319 if (test_bit(GFF_EXLOCK, &gf->f_flags))
320 goto skip_lock;
321 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400322 gfs2_holder_init(ip->i_gl, LM_ST_SHARED,
Steven Whitehouse2ca99502006-11-08 10:26:54 -0500323 LM_FLAG_TRY_1CB|GL_ATIME, &gh);
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400324 do_unlock = 1;
Steven Whitehousedcd24792006-11-16 11:08:16 -0500325 ret = gfs2_glock_nq_atime(&gh);
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400326 if (ret == GLR_TRYFAILED)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400327 goto out_noerror;
328 if (unlikely(ret))
329 goto out_unlock;
330 }
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400331skip_lock:
Steven Whitehousee1d5b182006-12-15 16:49:51 -0500332 if (!gfs2_is_stuffed(ip))
Steven Whitehousefd88de562006-05-05 16:59:11 -0400333 ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400334
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400335 if (do_unlock) {
Steven Whitehousefd88de562006-05-05 16:59:11 -0400336 gfs2_glock_dq_m(1, &gh);
337 gfs2_holder_uninit(&gh);
338 }
339out:
340 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
341 ret = -EIO;
342 return ret;
343out_noerror:
344 ret = 0;
345out_unlock:
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400346 if (do_unlock)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400347 gfs2_holder_uninit(&gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000348 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000349}
350
351/**
352 * gfs2_prepare_write - Prepare to write a page to a file
353 * @file: The file to write to
354 * @page: The page which is to be prepared for writing
355 * @from: From (byte range within page)
356 * @to: To (byte range within page)
357 *
358 * Returns: errno
359 */
360
361static int gfs2_prepare_write(struct file *file, struct page *page,
362 unsigned from, unsigned to)
363{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400364 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
365 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000366 unsigned int data_blocks, ind_blocks, rblocks;
367 int alloc_required;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000368 int error = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000369 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from;
370 loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
371 struct gfs2_alloc *al;
Russell Cattelan52ae7b72006-10-09 12:11:54 -0500372 unsigned int write_len = to - from;
373
David Teiglandb3b94fa2006-01-16 16:50:04 +0000374
Steven Whitehouse2ca99502006-11-08 10:26:54 -0500375 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|LM_FLAG_TRY_1CB, &ip->i_gh);
Steven Whitehousedcd24792006-11-16 11:08:16 -0500376 error = gfs2_glock_nq_atime(&ip->i_gh);
Steven Whitehouse2ca99502006-11-08 10:26:54 -0500377 if (unlikely(error)) {
Steven Whitehouse2d72e712007-02-07 10:25:59 -0500378 if (error == GLR_TRYFAILED) {
379 unlock_page(page);
Steven Whitehouse2ca99502006-11-08 10:26:54 -0500380 error = AOP_TRUNCATED_PAGE;
Josef Whitera13cbe32007-02-23 12:49:51 -0500381 yield();
Steven Whitehouse2d72e712007-02-07 10:25:59 -0500382 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000383 goto out_uninit;
Steven Whitehouse2ca99502006-11-08 10:26:54 -0500384 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000385
Russell Cattelan52ae7b72006-10-09 12:11:54 -0500386 gfs2_write_calc_reserv(ip, write_len, &data_blocks, &ind_blocks);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000387
Russell Cattelan52ae7b72006-10-09 12:11:54 -0500388 error = gfs2_write_alloc_required(ip, pos, write_len, &alloc_required);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000389 if (error)
390 goto out_unlock;
391
392
Steven Whitehousef5c54802006-10-10 13:45:15 -0400393 ip->i_alloc.al_requested = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000394 if (alloc_required) {
395 al = gfs2_alloc_get(ip);
396
397 error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
398 if (error)
399 goto out_alloc_put;
400
Steven Whitehouse2933f922006-11-01 13:23:29 -0500401 error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000402 if (error)
403 goto out_qunlock;
404
405 al->al_requested = data_blocks + ind_blocks;
406 error = gfs2_inplace_reserve(ip);
407 if (error)
408 goto out_qunlock;
409 }
410
411 rblocks = RES_DINODE + ind_blocks;
412 if (gfs2_is_jdata(ip))
413 rblocks += data_blocks ? data_blocks : 1;
414 if (ind_blocks || data_blocks)
415 rblocks += RES_STATFS + RES_QUOTA;
416
417 error = gfs2_trans_begin(sdp, rblocks, 0);
418 if (error)
419 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000420
421 if (gfs2_is_stuffed(ip)) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000422 if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400423 error = gfs2_unstuff_dinode(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000424 if (error == 0)
425 goto prepare_write;
426 } else if (!PageUptodate(page))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000427 error = stuffed_readpage(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000428 goto out;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000429 }
430
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000431prepare_write:
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000432 error = block_prepare_write(page, from, to, gfs2_get_block);
433
434out:
435 if (error) {
436 gfs2_trans_end(sdp);
437 if (alloc_required) {
438 gfs2_inplace_release(ip);
439out_qunlock:
440 gfs2_quota_unlock(ip);
441out_alloc_put:
442 gfs2_alloc_put(ip);
443 }
444out_unlock:
445 gfs2_glock_dq_m(1, &ip->i_gh);
446out_uninit:
447 gfs2_holder_uninit(&ip->i_gh);
448 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000449
450 return error;
451}
452
453/**
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500454 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
455 * @inode: the rindex inode
456 */
457static void adjust_fs_space(struct inode *inode)
458{
459 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
460 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
461 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
462 u64 fs_total, new_free;
463
464 /* Total up the file system space, according to the latest rindex. */
465 fs_total = gfs2_ri_total(sdp);
466
467 spin_lock(&sdp->sd_statfs_spin);
468 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
469 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
470 else
471 new_free = 0;
472 spin_unlock(&sdp->sd_statfs_spin);
Robert Peterson6c532672007-05-10 16:54:38 -0500473 fs_warn(sdp, "File system extended by %llu blocks.\n",
474 (unsigned long long)new_free);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500475 gfs2_statfs_change(sdp, new_free, new_free, 0);
476}
477
478/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000479 * gfs2_commit_write - Commit write to a file
480 * @file: The file to write to
481 * @page: The page containing the data
482 * @from: From (byte range within page)
483 * @to: To (byte range within page)
484 *
485 * Returns: errno
486 */
487
488static int gfs2_commit_write(struct file *file, struct page *page,
489 unsigned from, unsigned to)
490{
491 struct inode *inode = page->mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400492 struct gfs2_inode *ip = GFS2_I(inode);
493 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000494 int error = -EOPNOTSUPP;
495 struct buffer_head *dibh;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400496 struct gfs2_alloc *al = &ip->i_alloc;
497 struct gfs2_dinode *di;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000498
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000499 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)))
500 goto fail_nounlock;
501
502 error = gfs2_meta_inode_buffer(ip, &dibh);
503 if (error)
504 goto fail_endtrans;
505
506 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400507 di = (struct gfs2_dinode *)dibh->b_data;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000508
David Teiglandb3b94fa2006-01-16 16:50:04 +0000509 if (gfs2_is_stuffed(ip)) {
Steven Whitehousecd915492006-09-04 12:49:07 -0400510 u64 file_size;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000511 void *kaddr;
512
Steven Whitehousecd915492006-09-04 12:49:07 -0400513 file_size = ((u64)page->index << PAGE_CACHE_SHIFT) + to;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000514
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000515 kaddr = kmap_atomic(page, KM_USER0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000516 memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from,
Steven Whitehouse0bd59962006-09-04 14:59:35 -0400517 kaddr + from, to - from);
Russell Cattelanc312c4f2006-10-12 09:23:41 -0400518 kunmap_atomic(kaddr, KM_USER0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000519
520 SetPageUptodate(page);
521
Steven Whitehouseae619322006-11-22 11:28:47 -0500522 if (inode->i_size < file_size) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000523 i_size_write(inode, file_size);
Steven Whitehouseae619322006-11-22 11:28:47 -0500524 mark_inode_dirty(inode);
525 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000526 } else {
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500527 if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED ||
528 gfs2_is_jdata(ip))
Steven Whitehouse257f9b42006-01-31 10:00:25 +0000529 gfs2_page_add_databufs(ip, page, from, to);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000530 error = generic_commit_write(file, page, from, to);
531 if (error)
532 goto fail;
533 }
534
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400535 if (ip->i_di.di_size < inode->i_size) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000536 ip->i_di.di_size = inode->i_size;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400537 di->di_size = cpu_to_be64(inode->i_size);
538 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000539
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500540 if (inode == sdp->sd_rindex)
541 adjust_fs_space(inode);
542
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000543 brelse(dibh);
544 gfs2_trans_end(sdp);
545 if (al->al_requested) {
546 gfs2_inplace_release(ip);
547 gfs2_quota_unlock(ip);
548 gfs2_alloc_put(ip);
549 }
Josef Whiter1de91392007-03-12 16:55:07 -0500550 unlock_page(page);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000551 gfs2_glock_dq_m(1, &ip->i_gh);
Josef Whiter1de91392007-03-12 16:55:07 -0500552 lock_page(page);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000553 gfs2_holder_uninit(&ip->i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000554 return 0;
555
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000556fail:
557 brelse(dibh);
558fail_endtrans:
559 gfs2_trans_end(sdp);
560 if (al->al_requested) {
561 gfs2_inplace_release(ip);
562 gfs2_quota_unlock(ip);
563 gfs2_alloc_put(ip);
564 }
Josef Whiter1de91392007-03-12 16:55:07 -0500565 unlock_page(page);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000566 gfs2_glock_dq_m(1, &ip->i_gh);
Josef Whiter1de91392007-03-12 16:55:07 -0500567 lock_page(page);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000568 gfs2_holder_uninit(&ip->i_gh);
569fail_nounlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000570 ClearPageUptodate(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000571 return error;
572}
573
574/**
Robert Peterson8fb68592007-06-12 11:24:36 -0500575 * gfs2_set_page_dirty - Page dirtying function
576 * @page: The page to dirty
577 *
578 * Returns: 1 if it dirtyed the page, or 0 otherwise
579 */
580
581static int gfs2_set_page_dirty(struct page *page)
582{
583 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
584 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
585
586 if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
587 SetPageChecked(page);
588 return __set_page_dirty_buffers(page);
589}
590
591/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000592 * gfs2_bmap - Block map function
593 * @mapping: Address space info
594 * @lblock: The block to map
595 *
596 * Returns: The disk address for the block or 0 on hole or error
597 */
598
599static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
600{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400601 struct gfs2_inode *ip = GFS2_I(mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000602 struct gfs2_holder i_gh;
603 sector_t dblock = 0;
604 int error;
605
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
607 if (error)
608 return 0;
609
610 if (!gfs2_is_stuffed(ip))
Steven Whitehouse4ff14672006-01-30 09:39:10 +0000611 dblock = generic_block_bmap(mapping, lblock, gfs2_get_block);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000612
613 gfs2_glock_dq_uninit(&i_gh);
614
615 return dblock;
616}
617
618static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh)
619{
Steven Whitehouse64fb4eb2006-01-18 13:14:40 +0000620 struct gfs2_bufdata *bd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000621
622 gfs2_log_lock(sdp);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500623 bd = bh->b_private;
Steven Whitehouse64fb4eb2006-01-18 13:14:40 +0000624 if (bd) {
625 bd->bd_bh = NULL;
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500626 bh->b_private = NULL;
Robert Peterson8fb68592007-06-12 11:24:36 -0500627 if (!bd->bd_ail && list_empty(&bd->bd_le.le_list))
628 kmem_cache_free(gfs2_bufdata_cachep, bd);
Steven Whitehouse15d00c02006-08-18 15:51:09 -0400629 }
630 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000631
632 lock_buffer(bh);
633 clear_buffer_dirty(bh);
634 bh->b_bdev = NULL;
635 clear_buffer_mapped(bh);
636 clear_buffer_req(bh);
637 clear_buffer_new(bh);
638 clear_buffer_delay(bh);
639 unlock_buffer(bh);
640}
641
Steven Whitehouse8628de02006-03-31 16:48:41 -0500642static void gfs2_invalidatepage(struct page *page, unsigned long offset)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000643{
Steven Whitehouse15d00c02006-08-18 15:51:09 -0400644 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000645 struct buffer_head *head, *bh, *next;
646 unsigned int curr_off = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000647
648 BUG_ON(!PageLocked(page));
Robert Peterson8fb68592007-06-12 11:24:36 -0500649 if (offset == 0)
650 ClearPageChecked(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000651 if (!page_has_buffers(page))
Steven Whitehouse8628de02006-03-31 16:48:41 -0500652 return;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000653
654 bh = head = page_buffers(page);
655 do {
656 unsigned int next_off = curr_off + bh->b_size;
657 next = bh->b_this_page;
658
659 if (offset <= curr_off)
660 discard_buffer(sdp, bh);
661
662 curr_off = next_off;
663 bh = next;
664 } while (bh != head);
665
666 if (!offset)
Steven Whitehouse8628de02006-03-31 16:48:41 -0500667 try_to_release_page(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000668
Steven Whitehouse8628de02006-03-31 16:48:41 -0500669 return;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000670}
671
Steven Whitehousec7b33832006-12-14 18:24:26 +0000672/**
673 * gfs2_ok_for_dio - check that dio is valid on this file
674 * @ip: The inode
675 * @rw: READ or WRITE
676 * @offset: The offset at which we are reading or writing
677 *
678 * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
679 * 1 (to accept the i/o request)
680 */
681static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset)
682{
683 /*
684 * Should we return an error here? I can't see that O_DIRECT for
685 * a journaled file makes any sense. For now we'll silently fall
686 * back to buffered I/O, likewise we do the same for stuffed
687 * files since they are (a) small and (b) unaligned.
688 */
689 if (gfs2_is_jdata(ip))
690 return 0;
691
692 if (gfs2_is_stuffed(ip))
693 return 0;
694
695 if (offset > i_size_read(&ip->i_inode))
696 return 0;
697 return 1;
698}
699
700
701
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400702static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
703 const struct iovec *iov, loff_t offset,
704 unsigned long nr_segs)
Steven Whitehoused1665e42006-02-14 11:54:42 +0000705{
706 struct file *file = iocb->ki_filp;
707 struct inode *inode = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400708 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000709 struct gfs2_holder gh;
710 int rv;
711
712 /*
Steven Whitehousec7b33832006-12-14 18:24:26 +0000713 * Deferred lock, even if its a write, since we do no allocation
714 * on this path. All we need change is atime, and this lock mode
715 * ensures that other nodes have flushed their buffered read caches
716 * (i.e. their page cache entries for this inode). We do not,
717 * unfortunately have the option of only flushing a range like
718 * the VFS does.
Steven Whitehoused1665e42006-02-14 11:54:42 +0000719 */
Steven Whitehousec7b33832006-12-14 18:24:26 +0000720 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, GL_ATIME, &gh);
Steven Whitehousedcd24792006-11-16 11:08:16 -0500721 rv = gfs2_glock_nq_atime(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000722 if (rv)
Steven Whitehousec7b33832006-12-14 18:24:26 +0000723 return rv;
724 rv = gfs2_ok_for_dio(ip, rw, offset);
725 if (rv != 1)
726 goto out; /* dio not valid, fall back to buffered i/o */
Steven Whitehoused1665e42006-02-14 11:54:42 +0000727
Steven Whitehousec7b33832006-12-14 18:24:26 +0000728 rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev,
729 iov, offset, nr_segs,
730 gfs2_get_block_direct, NULL);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000731out:
732 gfs2_glock_dq_m(1, &gh);
733 gfs2_holder_uninit(&gh);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000734 return rv;
735}
736
737/**
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400738 * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out.
739 * @bh: the buffer we're stuck on
740 *
741 */
742
743static void stuck_releasepage(struct buffer_head *bh)
744{
745 struct inode *inode = bh->b_page->mapping->host;
746 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
747 struct gfs2_bufdata *bd = bh->b_private;
748 struct gfs2_glock *gl;
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400749static unsigned limit = 0;
750
Steven Whitehouse0bd59962006-09-04 14:59:35 -0400751 if (limit > 3)
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400752 return;
Steven Whitehouse0bd59962006-09-04 14:59:35 -0400753 limit++;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400754
755 fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode);
756 fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n",
757 (unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count));
758 fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh));
759 fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL");
760
761 if (!bd)
762 return;
763
764 gl = bd->bd_gl;
765
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400766 fs_warn(sdp, "gl = (%u, %llu)\n",
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400767 gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number);
768
769 fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n",
770 (list_empty(&bd->bd_list_tr)) ? "no" : "yes",
771 (list_empty(&bd->bd_le.le_list)) ? "no" : "yes");
772
773 if (gl->gl_ops == &gfs2_inode_glops) {
774 struct gfs2_inode *ip = gl->gl_object;
775 unsigned int x;
776
777 if (!ip)
778 return;
779
780 fs_warn(sdp, "ip = %llu %llu\n",
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100781 (unsigned long long)ip->i_no_formal_ino,
782 (unsigned long long)ip->i_no_addr);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400783
784 for (x = 0; x < GFS2_MAX_META_HEIGHT; x++)
785 fs_warn(sdp, "ip->i_cache[%u] = %s\n",
786 x, (ip->i_cache[x]) ? "!NULL" : "NULL");
787 }
788}
789
790/**
Steven Whitehouse623d9352006-08-31 12:14:44 -0400791 * gfs2_releasepage - free the metadata associated with a page
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400792 * @page: the page that's being released
793 * @gfp_mask: passed from Linux VFS, ignored by us
794 *
795 * Call try_to_free_buffers() if the buffers in this page can be
796 * released.
797 *
798 * Returns: 0
799 */
800
801int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
802{
803 struct inode *aspace = page->mapping->host;
804 struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info;
805 struct buffer_head *bh, *head;
806 struct gfs2_bufdata *bd;
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400807 unsigned long t = jiffies + gfs2_tune_get(sdp, gt_stall_secs) * HZ;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400808
809 if (!page_has_buffers(page))
810 goto out;
811
812 head = bh = page_buffers(page);
813 do {
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400814 while (atomic_read(&bh->b_count)) {
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400815 if (!atomic_read(&aspace->i_writecount))
816 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400817
Russell Cattelan61057c62006-11-09 11:42:33 -0500818 if (!(gfp_mask & __GFP_WAIT))
819 return 0;
820
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400821 if (time_after_eq(jiffies, t)) {
822 stuck_releasepage(bh);
823 /* should we withdraw here? */
824 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400825 }
826
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400827 yield();
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400828 }
829
830 gfs2_assert_warn(sdp, !buffer_pinned(bh));
Steven Whitehouse623d9352006-08-31 12:14:44 -0400831 gfs2_assert_warn(sdp, !buffer_dirty(bh));
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400832
Steven Whitehouse623d9352006-08-31 12:14:44 -0400833 gfs2_log_lock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400834 bd = bh->b_private;
835 if (bd) {
836 gfs2_assert_warn(sdp, bd->bd_bh == bh);
837 gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr));
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400838 gfs2_assert_warn(sdp, !bd->bd_ail);
Steven Whitehouse623d9352006-08-31 12:14:44 -0400839 bd->bd_bh = NULL;
840 if (!list_empty(&bd->bd_le.le_list))
841 bd = NULL;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400842 bh->b_private = NULL;
843 }
Steven Whitehouse623d9352006-08-31 12:14:44 -0400844 gfs2_log_unlock(sdp);
845 if (bd)
846 kmem_cache_free(gfs2_bufdata_cachep, bd);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400847
848 bh = bh->b_this_page;
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400849 } while (bh != head);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400850
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400851out:
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400852 return try_to_free_buffers(page);
853}
854
Steven Whitehouse66de0452006-07-03 13:37:30 -0400855const struct address_space_operations gfs2_file_aops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000856 .writepage = gfs2_writepage,
Steven Whitehousea8d638e2007-01-15 13:52:17 +0000857 .writepages = gfs2_writepages,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000858 .readpage = gfs2_readpage,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400859 .readpages = gfs2_readpages,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000860 .sync_page = block_sync_page,
861 .prepare_write = gfs2_prepare_write,
862 .commit_write = gfs2_commit_write,
Robert Peterson8fb68592007-06-12 11:24:36 -0500863 .set_page_dirty = gfs2_set_page_dirty,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000864 .bmap = gfs2_bmap,
865 .invalidatepage = gfs2_invalidatepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400866 .releasepage = gfs2_releasepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000867 .direct_IO = gfs2_direct_IO,
868};
869