blob: 4fb743f4e4a42bae5cc2c585a3ae8122ed8ae983 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 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 Whitehouse5c676f62006-02-27 17:23:27 -050019#include <linux/gfs2_ondisk.h>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020020#include <linux/lm_interface.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000021
22#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050023#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000024#include "bmap.h"
25#include "glock.h"
26#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000027#include "log.h"
28#include "meta_io.h"
29#include "ops_address.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000030#include "quota.h"
31#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000032#include "rgrp.h"
Steven Whitehouse61a30dc2006-02-15 10:15:18 +000033#include "ops_file.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050034#include "util.h"
Steven Whitehouse4340fe62006-07-11 09:46:33 -040035#include "glops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000036
Steven Whitehouseba7f7292006-07-26 11:27:10 -040037
38static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
39 unsigned int from, unsigned int to)
40{
41 struct buffer_head *head = page_buffers(page);
42 unsigned int bsize = head->b_size;
43 struct buffer_head *bh;
44 unsigned int start, end;
45
46 for (bh = head, start = 0; bh != head || !start;
47 bh = bh->b_this_page, start = end) {
48 end = start + bsize;
49 if (end <= from || start >= to)
50 continue;
51 gfs2_trans_add_bh(ip->i_gl, bh, 0);
52 }
53}
54
David Teiglandb3b94fa2006-01-16 16:50:04 +000055/**
Steven Whitehouse4ff14672006-01-30 09:39:10 +000056 * gfs2_get_block - Fills in a buffer head with details about a block
David Teiglandb3b94fa2006-01-16 16:50:04 +000057 * @inode: The inode
58 * @lblock: The block number to look up
59 * @bh_result: The buffer head to return the result in
60 * @create: Non-zero if we may add block to the file
61 *
62 * Returns: errno
63 */
64
Steven Whitehouse4ff14672006-01-30 09:39:10 +000065int gfs2_get_block(struct inode *inode, sector_t lblock,
66 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000067{
Steven Whitehouse7276b3b2006-09-21 17:05:23 -040068 return gfs2_block_map(inode, lblock, create, bh_result, 32);
David Teiglandb3b94fa2006-01-16 16:50:04 +000069}
70
71/**
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040072 * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
David Teiglandb3b94fa2006-01-16 16:50:04 +000073 * @inode: The inode
74 * @lblock: The block number to look up
75 * @bh_result: The buffer head to return the result in
76 * @create: Non-zero if we may add block to the file
77 *
78 * Returns: errno
79 */
80
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040081static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
82 struct buffer_head *bh_result, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +000083{
David Teiglandb3b94fa2006-01-16 16:50:04 +000084 int error;
85
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040086 error = gfs2_block_map(inode, lblock, 0, bh_result, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +000087 if (error)
88 return error;
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040089 if (bh_result->b_blocknr == 0)
90 return -EIO;
Steven Whitehouse623d9352006-08-31 12:14:44 -040091 return 0;
92}
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040093
94static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
95 struct buffer_head *bh_result, int create)
96{
Steven Whitehouse56965532006-09-20 15:48:09 -040097 return gfs2_block_map(inode, lblock, 0, bh_result, 32);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -040098}
99
David Teiglandb3b94fa2006-01-16 16:50:04 +0000100/**
101 * gfs2_writepage - Write complete page
102 * @page: Page to write
103 *
104 * Returns: errno
105 *
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000106 * Some of this is copied from block_write_full_page() although we still
107 * call it to do most of the work.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000108 */
109
110static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
111{
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000112 struct inode *inode = page->mapping->host;
Steven Whitehousef4387142006-08-08 13:23:19 -0400113 struct gfs2_inode *ip = GFS2_I(inode);
114 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000115 loff_t i_size = i_size_read(inode);
116 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
117 unsigned offset;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000118 int error;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000119 int done_trans = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000120
David Teiglandb3b94fa2006-01-16 16:50:04 +0000121 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) {
122 unlock_page(page);
123 return -EIO;
124 }
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500125 if (current->journal_info)
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000126 goto out_ignore;
127
128 /* Is the page fully outside i_size? (truncate in progress) */
129 offset = i_size & (PAGE_CACHE_SIZE-1);
Steven Whitehoused2d7b8a2006-05-02 12:09:42 -0400130 if (page->index > end_index || (page->index == end_index && !offset)) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000131 page->mapping->a_ops->invalidatepage(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000132 unlock_page(page);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000133 return 0; /* don't care */
134 }
135
136 if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) {
137 error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
138 if (error)
139 goto out_ignore;
Steven Whitehousef4387142006-08-08 13:23:19 -0400140 if (!page_has_buffers(page)) {
141 create_empty_buffers(page, inode->i_sb->s_blocksize,
142 (1 << BH_Dirty)|(1 << BH_Uptodate));
143 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000144 gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
145 done_trans = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000146 }
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400147 error = block_write_full_page(page, gfs2_get_block_noalloc, wbc);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000148 if (done_trans)
149 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000150 gfs2_meta_cache_flush(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000151 return error;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000152
153out_ignore:
154 redirty_page_for_writepage(wbc, page);
155 unlock_page(page);
156 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000157}
158
Steven Whitehousefd88de562006-05-05 16:59:11 -0400159static int zero_readpage(struct page *page)
160{
161 void *kaddr;
162
163 kaddr = kmap_atomic(page, KM_USER0);
164 memset(kaddr, 0, PAGE_CACHE_SIZE);
165 kunmap_atomic(page, KM_USER0);
166
167 SetPageUptodate(page);
168
169 return 0;
170}
171
David Teiglandb3b94fa2006-01-16 16:50:04 +0000172/**
173 * stuffed_readpage - Fill in a Linux page with stuffed file data
174 * @ip: the inode
175 * @page: the page
176 *
177 * Returns: errno
178 */
179
180static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
181{
182 struct buffer_head *dibh;
183 void *kaddr;
184 int error;
185
Steven Whitehousefd88de562006-05-05 16:59:11 -0400186 /* Only the first page of a stuffed file might contain data */
187 if (unlikely(page->index))
188 return zero_readpage(page);
189
David Teiglandb3b94fa2006-01-16 16:50:04 +0000190 error = gfs2_meta_inode_buffer(ip, &dibh);
191 if (error)
192 return error;
193
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000194 kaddr = kmap_atomic(page, KM_USER0);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400195 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
David Teiglandb3b94fa2006-01-16 16:50:04 +0000196 ip->i_di.di_size);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400197 memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000198 kunmap_atomic(page, KM_USER0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000199
200 brelse(dibh);
201
202 SetPageUptodate(page);
203
204 return 0;
205}
206
David Teiglandb3b94fa2006-01-16 16:50:04 +0000207
208/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000209 * gfs2_readpage - readpage with locking
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000210 * @file: The file to read a page for. N.B. This may be NULL if we are
211 * reading an internal file.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000212 * @page: The page to read
213 *
214 * Returns: errno
215 */
216
217static int gfs2_readpage(struct file *file, struct page *page)
218{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400219 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
220 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
Russell Cattelandc41aee2006-09-18 17:26:48 -0400221 struct gfs2_file *gf = NULL;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000222 struct gfs2_holder gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000223 int error;
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400224 int do_unlock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000225
Steven Whitehousedd538c82006-09-04 14:53:30 -0400226 if (likely(file != &gfs2_internal_file_sentinel)) {
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400227 if (file) {
Russell Cattelandc41aee2006-09-18 17:26:48 -0400228 gf = file->private_data;
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400229 if (test_bit(GFF_EXLOCK, &gf->f_flags))
Russell Cattelandc41aee2006-09-18 17:26:48 -0400230 /* gfs2_sharewrite_nopage has grabbed the ip->i_gl already */
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400231 goto skip_lock;
232 }
Steven Whitehousefe1bded2006-04-18 10:09:15 -0400233 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|GL_AOP, &gh);
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400234 do_unlock = 1;
Steven Whitehouse61a30dc2006-02-15 10:15:18 +0000235 error = gfs2_glock_nq_m_atime(1, &gh);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400236 if (unlikely(error))
Steven Whitehouse61a30dc2006-02-15 10:15:18 +0000237 goto out_unlock;
238 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000239
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400240skip_lock:
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000241 if (gfs2_is_stuffed(ip)) {
Steven Whitehousefd88de562006-05-05 16:59:11 -0400242 error = stuffed_readpage(ip, page);
243 unlock_page(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000244 } else
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000245 error = mpage_readpage(page, gfs2_get_block);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000246
247 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
248 error = -EIO;
249
Steven Whitehouse07903c02006-09-18 17:30:05 -0400250 if (do_unlock) {
Steven Whitehouse61a30dc2006-02-15 10:15:18 +0000251 gfs2_glock_dq_m(1, &gh);
252 gfs2_holder_uninit(&gh);
253 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000254out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000255 return error;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000256out_unlock:
257 unlock_page(page);
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400258 if (do_unlock)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400259 gfs2_holder_uninit(&gh);
260 goto out;
261}
262
Steven Whitehousefd88de562006-05-05 16:59:11 -0400263/**
264 * gfs2_readpages - Read a bunch of pages at once
265 *
266 * Some notes:
267 * 1. This is only for readahead, so we can simply ignore any things
268 * which are slightly inconvenient (such as locking conflicts between
269 * the page lock and the glock) and return having done no I/O. Its
270 * obviously not something we'd want to do on too regular a basis.
271 * Any I/O we ignore at this time will be done via readpage later.
272 * 2. We have to handle stuffed files here too.
273 * 3. mpage_readpages() does most of the heavy lifting in the common case.
274 * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places.
275 * 5. We use LM_FLAG_TRY_1CB here, effectively we then have lock-ahead as
276 * well as read-ahead.
277 */
278static int gfs2_readpages(struct file *file, struct address_space *mapping,
279 struct list_head *pages, unsigned nr_pages)
280{
281 struct inode *inode = mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400282 struct gfs2_inode *ip = GFS2_I(inode);
283 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400284 struct gfs2_holder gh;
285 unsigned page_idx;
286 int ret;
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400287 int do_unlock = 0;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400288
Steven Whitehousedd538c82006-09-04 14:53:30 -0400289 if (likely(file != &gfs2_internal_file_sentinel)) {
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400290 if (file) {
291 struct gfs2_file *gf = file->private_data;
292 if (test_bit(GFF_EXLOCK, &gf->f_flags))
293 goto skip_lock;
294 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400295 gfs2_holder_init(ip->i_gl, LM_ST_SHARED,
296 LM_FLAG_TRY_1CB|GL_ATIME|GL_AOP, &gh);
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400297 do_unlock = 1;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400298 ret = gfs2_glock_nq_m_atime(1, &gh);
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400299 if (ret == GLR_TRYFAILED)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400300 goto out_noerror;
301 if (unlikely(ret))
302 goto out_unlock;
303 }
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400304skip_lock:
Steven Whitehousefd88de562006-05-05 16:59:11 -0400305 if (gfs2_is_stuffed(ip)) {
306 struct pagevec lru_pvec;
307 pagevec_init(&lru_pvec, 0);
308 for (page_idx = 0; page_idx < nr_pages; page_idx++) {
Steven Whitehouseffeb8742006-07-10 15:47:01 -0400309 struct page *page = list_entry(pages->prev, struct page, lru);
310 prefetchw(&page->flags);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400311 list_del(&page->lru);
312 if (!add_to_page_cache(page, mapping,
313 page->index, GFP_KERNEL)) {
314 ret = stuffed_readpage(ip, page);
315 unlock_page(page);
316 if (!pagevec_add(&lru_pvec, page))
317 __pagevec_lru_add(&lru_pvec);
Steven Whitehouseffeb8742006-07-10 15:47:01 -0400318 } else {
319 page_cache_release(page);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400320 }
Steven Whitehousefd88de562006-05-05 16:59:11 -0400321 }
322 pagevec_lru_add(&lru_pvec);
323 ret = 0;
324 } else {
325 /* What we really want to do .... */
326 ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block);
327 }
328
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400329 if (do_unlock) {
Steven Whitehousefd88de562006-05-05 16:59:11 -0400330 gfs2_glock_dq_m(1, &gh);
331 gfs2_holder_uninit(&gh);
332 }
333out:
334 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
335 ret = -EIO;
336 return ret;
337out_noerror:
338 ret = 0;
339out_unlock:
340 /* unlock all pages, we can't do any I/O right now */
341 for (page_idx = 0; page_idx < nr_pages; page_idx++) {
Steven Whitehouseffeb8742006-07-10 15:47:01 -0400342 struct page *page = list_entry(pages->prev, struct page, lru);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400343 list_del(&page->lru);
344 unlock_page(page);
345 page_cache_release(page);
346 }
Steven Whitehouse59a1cc62006-08-04 15:41:22 -0400347 if (do_unlock)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400348 gfs2_holder_uninit(&gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000349 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000350}
351
352/**
353 * gfs2_prepare_write - Prepare to write a page to a file
354 * @file: The file to write to
355 * @page: The page which is to be prepared for writing
356 * @from: From (byte range within page)
357 * @to: To (byte range within page)
358 *
359 * Returns: errno
360 */
361
362static int gfs2_prepare_write(struct file *file, struct page *page,
363 unsigned from, unsigned to)
364{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400365 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
366 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000367 unsigned int data_blocks, ind_blocks, rblocks;
368 int alloc_required;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000369 int error = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000370 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from;
371 loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
372 struct gfs2_alloc *al;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000373
Steven Whitehousefe1bded2006-04-18 10:09:15 -0400374 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|GL_AOP, &ip->i_gh);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000375 error = gfs2_glock_nq_m_atime(1, &ip->i_gh);
376 if (error)
377 goto out_uninit;
378
379 gfs2_write_calc_reserv(ip, to - from, &data_blocks, &ind_blocks);
380
381 error = gfs2_write_alloc_required(ip, pos, from - to, &alloc_required);
382 if (error)
383 goto out_unlock;
384
385
386 if (alloc_required) {
387 al = gfs2_alloc_get(ip);
388
389 error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
390 if (error)
391 goto out_alloc_put;
392
393 error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
394 if (error)
395 goto out_qunlock;
396
397 al->al_requested = data_blocks + ind_blocks;
398 error = gfs2_inplace_reserve(ip);
399 if (error)
400 goto out_qunlock;
401 }
402
403 rblocks = RES_DINODE + ind_blocks;
404 if (gfs2_is_jdata(ip))
405 rblocks += data_blocks ? data_blocks : 1;
406 if (ind_blocks || data_blocks)
407 rblocks += RES_STATFS + RES_QUOTA;
408
409 error = gfs2_trans_begin(sdp, rblocks, 0);
410 if (error)
411 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000412
413 if (gfs2_is_stuffed(ip)) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000414 if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400415 error = gfs2_unstuff_dinode(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000416 if (error == 0)
417 goto prepare_write;
418 } else if (!PageUptodate(page))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000419 error = stuffed_readpage(ip, page);
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000420 goto out;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000421 }
422
Steven Whitehouse5c4e9e02006-02-15 12:26:19 +0000423prepare_write:
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000424 error = block_prepare_write(page, from, to, gfs2_get_block);
425
426out:
427 if (error) {
428 gfs2_trans_end(sdp);
429 if (alloc_required) {
430 gfs2_inplace_release(ip);
431out_qunlock:
432 gfs2_quota_unlock(ip);
433out_alloc_put:
434 gfs2_alloc_put(ip);
435 }
436out_unlock:
437 gfs2_glock_dq_m(1, &ip->i_gh);
438out_uninit:
439 gfs2_holder_uninit(&ip->i_gh);
440 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000441
442 return error;
443}
444
445/**
446 * gfs2_commit_write - Commit write to a file
447 * @file: The file to write to
448 * @page: The page containing the data
449 * @from: From (byte range within page)
450 * @to: To (byte range within page)
451 *
452 * Returns: errno
453 */
454
455static int gfs2_commit_write(struct file *file, struct page *page,
456 unsigned from, unsigned to)
457{
458 struct inode *inode = page->mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400459 struct gfs2_inode *ip = GFS2_I(inode);
460 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000461 int error = -EOPNOTSUPP;
462 struct buffer_head *dibh;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400463 struct gfs2_alloc *al = &ip->i_alloc;
464 struct gfs2_dinode *di;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000465
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000466 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)))
467 goto fail_nounlock;
468
469 error = gfs2_meta_inode_buffer(ip, &dibh);
470 if (error)
471 goto fail_endtrans;
472
473 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400474 di = (struct gfs2_dinode *)dibh->b_data;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000475
David Teiglandb3b94fa2006-01-16 16:50:04 +0000476 if (gfs2_is_stuffed(ip)) {
Steven Whitehousecd915492006-09-04 12:49:07 -0400477 u64 file_size;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000478 void *kaddr;
479
Steven Whitehousecd915492006-09-04 12:49:07 -0400480 file_size = ((u64)page->index << PAGE_CACHE_SHIFT) + to;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000481
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000482 kaddr = kmap_atomic(page, KM_USER0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000483 memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from,
Steven Whitehouse0bd59962006-09-04 14:59:35 -0400484 kaddr + from, to - from);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000485 kunmap_atomic(page, KM_USER0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000486
487 SetPageUptodate(page);
488
489 if (inode->i_size < file_size)
490 i_size_write(inode, file_size);
491 } else {
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500492 if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED ||
493 gfs2_is_jdata(ip))
Steven Whitehouse257f9b42006-01-31 10:00:25 +0000494 gfs2_page_add_databufs(ip, page, from, to);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000495 error = generic_commit_write(file, page, from, to);
496 if (error)
497 goto fail;
498 }
499
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400500 if (ip->i_di.di_size < inode->i_size) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000501 ip->i_di.di_size = inode->i_size;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400502 di->di_size = cpu_to_be64(inode->i_size);
503 }
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000504
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400505 di->di_mode = cpu_to_be32(inode->i_mode);
506 di->di_atime = cpu_to_be64(inode->i_atime.tv_sec);
507 di->di_mtime = cpu_to_be64(inode->i_mtime.tv_sec);
508 di->di_ctime = cpu_to_be64(inode->i_ctime.tv_sec);
509
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000510 brelse(dibh);
511 gfs2_trans_end(sdp);
512 if (al->al_requested) {
513 gfs2_inplace_release(ip);
514 gfs2_quota_unlock(ip);
515 gfs2_alloc_put(ip);
516 }
517 gfs2_glock_dq_m(1, &ip->i_gh);
518 gfs2_holder_uninit(&ip->i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000519 return 0;
520
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000521fail:
522 brelse(dibh);
523fail_endtrans:
524 gfs2_trans_end(sdp);
525 if (al->al_requested) {
526 gfs2_inplace_release(ip);
527 gfs2_quota_unlock(ip);
528 gfs2_alloc_put(ip);
529 }
530 gfs2_glock_dq_m(1, &ip->i_gh);
531 gfs2_holder_uninit(&ip->i_gh);
532fail_nounlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000533 ClearPageUptodate(page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000534 return error;
535}
536
537/**
538 * gfs2_bmap - Block map function
539 * @mapping: Address space info
540 * @lblock: The block to map
541 *
542 * Returns: The disk address for the block or 0 on hole or error
543 */
544
545static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
546{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400547 struct gfs2_inode *ip = GFS2_I(mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000548 struct gfs2_holder i_gh;
549 sector_t dblock = 0;
550 int error;
551
David Teiglandb3b94fa2006-01-16 16:50:04 +0000552 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
553 if (error)
554 return 0;
555
556 if (!gfs2_is_stuffed(ip))
Steven Whitehouse4ff14672006-01-30 09:39:10 +0000557 dblock = generic_block_bmap(mapping, lblock, gfs2_get_block);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000558
559 gfs2_glock_dq_uninit(&i_gh);
560
561 return dblock;
562}
563
564static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh)
565{
Steven Whitehouse64fb4eb2006-01-18 13:14:40 +0000566 struct gfs2_bufdata *bd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000567
568 gfs2_log_lock(sdp);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500569 bd = bh->b_private;
Steven Whitehouse64fb4eb2006-01-18 13:14:40 +0000570 if (bd) {
571 bd->bd_bh = NULL;
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500572 bh->b_private = NULL;
Steven Whitehouse15d00c02006-08-18 15:51:09 -0400573 }
574 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000575
576 lock_buffer(bh);
577 clear_buffer_dirty(bh);
578 bh->b_bdev = NULL;
579 clear_buffer_mapped(bh);
580 clear_buffer_req(bh);
581 clear_buffer_new(bh);
582 clear_buffer_delay(bh);
583 unlock_buffer(bh);
584}
585
Steven Whitehouse8628de02006-03-31 16:48:41 -0500586static void gfs2_invalidatepage(struct page *page, unsigned long offset)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000587{
Steven Whitehouse15d00c02006-08-18 15:51:09 -0400588 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000589 struct buffer_head *head, *bh, *next;
590 unsigned int curr_off = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000591
592 BUG_ON(!PageLocked(page));
593 if (!page_has_buffers(page))
Steven Whitehouse8628de02006-03-31 16:48:41 -0500594 return;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000595
596 bh = head = page_buffers(page);
597 do {
598 unsigned int next_off = curr_off + bh->b_size;
599 next = bh->b_this_page;
600
601 if (offset <= curr_off)
602 discard_buffer(sdp, bh);
603
604 curr_off = next_off;
605 bh = next;
606 } while (bh != head);
607
608 if (!offset)
Steven Whitehouse8628de02006-03-31 16:48:41 -0500609 try_to_release_page(page, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000610
Steven Whitehouse8628de02006-03-31 16:48:41 -0500611 return;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000612}
613
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400614static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
615 const struct iovec *iov, loff_t offset,
616 unsigned long nr_segs)
Steven Whitehoused1665e42006-02-14 11:54:42 +0000617{
618 struct file *file = iocb->ki_filp;
619 struct inode *inode = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400620 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000621 struct gfs2_holder gh;
622 int rv;
623
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400624 if (rw == READ)
625 mutex_lock(&inode->i_mutex);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000626 /*
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400627 * Shared lock, even if its a write, since we do no allocation
Steven Whitehoused1665e42006-02-14 11:54:42 +0000628 * on this path. All we need change is atime.
629 */
630 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
631 rv = gfs2_glock_nq_m_atime(1, &gh);
632 if (rv)
633 goto out;
634
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400635 if (offset > i_size_read(inode))
636 goto out;
637
Steven Whitehoused1665e42006-02-14 11:54:42 +0000638 /*
639 * Should we return an error here? I can't see that O_DIRECT for
640 * a journaled file makes any sense. For now we'll silently fall
641 * back to buffered I/O, likewise we do the same for stuffed
642 * files since they are (a) small and (b) unaligned.
643 */
644 if (gfs2_is_jdata(ip))
645 goto out;
646
647 if (gfs2_is_stuffed(ip))
648 goto out;
649
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400650 rv = blockdev_direct_IO_own_locking(rw, iocb, inode,
651 inode->i_sb->s_bdev,
652 iov, offset, nr_segs,
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400653 gfs2_get_block_direct, NULL);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000654out:
655 gfs2_glock_dq_m(1, &gh);
656 gfs2_holder_uninit(&gh);
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400657 if (rw == READ)
658 mutex_unlock(&inode->i_mutex);
Steven Whitehoused1665e42006-02-14 11:54:42 +0000659
660 return rv;
661}
662
663/**
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400664 * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out.
665 * @bh: the buffer we're stuck on
666 *
667 */
668
669static void stuck_releasepage(struct buffer_head *bh)
670{
671 struct inode *inode = bh->b_page->mapping->host;
672 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
673 struct gfs2_bufdata *bd = bh->b_private;
674 struct gfs2_glock *gl;
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400675static unsigned limit = 0;
676
Steven Whitehouse0bd59962006-09-04 14:59:35 -0400677 if (limit > 3)
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400678 return;
Steven Whitehouse0bd59962006-09-04 14:59:35 -0400679 limit++;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400680
681 fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode);
682 fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n",
683 (unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count));
684 fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh));
685 fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL");
686
687 if (!bd)
688 return;
689
690 gl = bd->bd_gl;
691
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400692 fs_warn(sdp, "gl = (%u, %llu)\n",
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400693 gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number);
694
695 fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n",
696 (list_empty(&bd->bd_list_tr)) ? "no" : "yes",
697 (list_empty(&bd->bd_le.le_list)) ? "no" : "yes");
698
699 if (gl->gl_ops == &gfs2_inode_glops) {
700 struct gfs2_inode *ip = gl->gl_object;
701 unsigned int x;
702
703 if (!ip)
704 return;
705
706 fs_warn(sdp, "ip = %llu %llu\n",
707 (unsigned long long)ip->i_num.no_formal_ino,
708 (unsigned long long)ip->i_num.no_addr);
709
710 for (x = 0; x < GFS2_MAX_META_HEIGHT; x++)
711 fs_warn(sdp, "ip->i_cache[%u] = %s\n",
712 x, (ip->i_cache[x]) ? "!NULL" : "NULL");
713 }
714}
715
716/**
Steven Whitehouse623d9352006-08-31 12:14:44 -0400717 * gfs2_releasepage - free the metadata associated with a page
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400718 * @page: the page that's being released
719 * @gfp_mask: passed from Linux VFS, ignored by us
720 *
721 * Call try_to_free_buffers() if the buffers in this page can be
722 * released.
723 *
724 * Returns: 0
725 */
726
727int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
728{
729 struct inode *aspace = page->mapping->host;
730 struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info;
731 struct buffer_head *bh, *head;
732 struct gfs2_bufdata *bd;
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400733 unsigned long t = jiffies + gfs2_tune_get(sdp, gt_stall_secs) * HZ;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400734
735 if (!page_has_buffers(page))
736 goto out;
737
738 head = bh = page_buffers(page);
739 do {
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400740 while (atomic_read(&bh->b_count)) {
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400741 if (!atomic_read(&aspace->i_writecount))
742 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400743
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400744 if (time_after_eq(jiffies, t)) {
745 stuck_releasepage(bh);
746 /* should we withdraw here? */
747 return 0;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400748 }
749
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400750 yield();
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400751 }
752
753 gfs2_assert_warn(sdp, !buffer_pinned(bh));
Steven Whitehouse623d9352006-08-31 12:14:44 -0400754 gfs2_assert_warn(sdp, !buffer_dirty(bh));
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400755
Steven Whitehouse623d9352006-08-31 12:14:44 -0400756 gfs2_log_lock(sdp);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400757 bd = bh->b_private;
758 if (bd) {
759 gfs2_assert_warn(sdp, bd->bd_bh == bh);
760 gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr));
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400761 gfs2_assert_warn(sdp, !bd->bd_ail);
Steven Whitehouse623d9352006-08-31 12:14:44 -0400762 bd->bd_bh = NULL;
763 if (!list_empty(&bd->bd_le.le_list))
764 bd = NULL;
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400765 bh->b_private = NULL;
766 }
Steven Whitehouse623d9352006-08-31 12:14:44 -0400767 gfs2_log_unlock(sdp);
768 if (bd)
769 kmem_cache_free(gfs2_bufdata_cachep, bd);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400770
771 bh = bh->b_this_page;
Steven Whitehouse166afcc2006-08-24 15:59:40 -0400772 } while (bh != head);
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400773
Steven Whitehousea9e5f4d2006-07-25 17:24:12 -0400774out:
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400775 return try_to_free_buffers(page);
776}
777
Steven Whitehouse66de0452006-07-03 13:37:30 -0400778const struct address_space_operations gfs2_file_aops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000779 .writepage = gfs2_writepage,
780 .readpage = gfs2_readpage,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400781 .readpages = gfs2_readpages,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000782 .sync_page = block_sync_page,
783 .prepare_write = gfs2_prepare_write,
784 .commit_write = gfs2_commit_write,
785 .bmap = gfs2_bmap,
786 .invalidatepage = gfs2_invalidatepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -0400787 .releasepage = gfs2_releasepage,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000788 .direct_IO = gfs2_direct_IO,
789};
790