David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 3 | * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 4 | * |
| 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 Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 7 | * of the GNU General Public License version 2. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 8 | */ |
| 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 Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 16 | #include <linux/pagevec.h> |
Steven Whitehouse | 9b124fb | 2006-01-30 11:55:32 +0000 | [diff] [blame] | 17 | #include <linux/mpage.h> |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 18 | #include <linux/fs.h> |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 19 | #include <linux/writeback.h> |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 20 | #include <linux/swap.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 21 | #include <linux/gfs2_ondisk.h> |
Fabio Massimo Di Nitto | 7d30859 | 2006-09-19 07:56:29 +0200 | [diff] [blame] | 22 | #include <linux/lm_interface.h> |
Steven Whitehouse | 47e83b5 | 2007-10-18 11:15:50 +0100 | [diff] [blame] | 23 | #include <linux/backing-dev.h> |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 24 | #include <linux/pagevec.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 25 | |
| 26 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 27 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 28 | #include "bmap.h" |
| 29 | #include "glock.h" |
| 30 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 31 | #include "log.h" |
| 32 | #include "meta_io.h" |
| 33 | #include "ops_address.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 34 | #include "quota.h" |
| 35 | #include "trans.h" |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 36 | #include "rgrp.h" |
Robert Peterson | cd81a4b | 2007-05-14 12:42:18 -0500 | [diff] [blame] | 37 | #include "super.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 38 | #include "util.h" |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 39 | #include "glops.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 40 | |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 41 | |
| 42 | static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, |
| 43 | unsigned int from, unsigned int to) |
| 44 | { |
| 45 | struct buffer_head *head = page_buffers(page); |
| 46 | unsigned int bsize = head->b_size; |
| 47 | struct buffer_head *bh; |
| 48 | unsigned int start, end; |
| 49 | |
| 50 | for (bh = head, start = 0; bh != head || !start; |
| 51 | bh = bh->b_this_page, start = end) { |
| 52 | end = start + bsize; |
| 53 | if (end <= from || start >= to) |
| 54 | continue; |
Benjamin Marzinski | ddf4b42 | 2007-06-01 14:21:38 -0500 | [diff] [blame] | 55 | if (gfs2_is_jdata(ip)) |
| 56 | set_buffer_uptodate(bh); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 57 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
| 58 | } |
| 59 | } |
| 60 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 61 | /** |
Steven Whitehouse | 4ff1467 | 2006-01-30 09:39:10 +0000 | [diff] [blame] | 62 | * gfs2_get_block - Fills in a buffer head with details about a block |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 63 | * @inode: The inode |
| 64 | * @lblock: The block number to look up |
| 65 | * @bh_result: The buffer head to return the result in |
| 66 | * @create: Non-zero if we may add block to the file |
| 67 | * |
| 68 | * Returns: errno |
| 69 | */ |
| 70 | |
Steven Whitehouse | 4ff1467 | 2006-01-30 09:39:10 +0000 | [diff] [blame] | 71 | int gfs2_get_block(struct inode *inode, sector_t lblock, |
| 72 | struct buffer_head *bh_result, int create) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 73 | { |
Steven Whitehouse | 2359125 | 2006-10-13 17:25:45 -0400 | [diff] [blame] | 74 | return gfs2_block_map(inode, lblock, create, bh_result); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | /** |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 78 | * gfs2_get_block_noalloc - Fills in a buffer head with details about a block |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 79 | * @inode: The inode |
| 80 | * @lblock: The block number to look up |
| 81 | * @bh_result: The buffer head to return the result in |
| 82 | * @create: Non-zero if we may add block to the file |
| 83 | * |
| 84 | * Returns: errno |
| 85 | */ |
| 86 | |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 87 | static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, |
| 88 | struct buffer_head *bh_result, int create) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 89 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 90 | int error; |
| 91 | |
Steven Whitehouse | 2359125 | 2006-10-13 17:25:45 -0400 | [diff] [blame] | 92 | error = gfs2_block_map(inode, lblock, 0, bh_result); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 93 | if (error) |
| 94 | return error; |
Wendy Cheng | de986e8 | 2007-09-18 09:19:13 -0400 | [diff] [blame] | 95 | if (!buffer_mapped(bh_result)) |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 96 | return -EIO; |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 97 | return 0; |
| 98 | } |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 99 | |
| 100 | static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, |
| 101 | struct buffer_head *bh_result, int create) |
| 102 | { |
Steven Whitehouse | 2359125 | 2006-10-13 17:25:45 -0400 | [diff] [blame] | 103 | return gfs2_block_map(inode, lblock, 0, bh_result); |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 104 | } |
| 105 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 106 | /** |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 107 | * gfs2_writepage_common - Common bits of writepage |
| 108 | * @page: The page to be written |
| 109 | * @wbc: The writeback control |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 110 | * |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 111 | * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 112 | */ |
| 113 | |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 114 | static int gfs2_writepage_common(struct page *page, |
| 115 | struct writeback_control *wbc) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 116 | { |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 117 | struct inode *inode = page->mapping->host; |
Steven Whitehouse | f438714 | 2006-08-08 13:23:19 -0400 | [diff] [blame] | 118 | struct gfs2_inode *ip = GFS2_I(inode); |
| 119 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 120 | loff_t i_size = i_size_read(inode); |
| 121 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
| 122 | unsigned offset; |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 123 | int ret = -EIO; |
| 124 | |
| 125 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) |
| 126 | goto out; |
| 127 | ret = 0; |
| 128 | if (current->journal_info) |
| 129 | goto redirty; |
| 130 | /* Is the page fully outside i_size? (truncate in progress) */ |
| 131 | offset = i_size & (PAGE_CACHE_SIZE-1); |
| 132 | if (page->index > end_index || (page->index == end_index && !offset)) { |
| 133 | page->mapping->a_ops->invalidatepage(page, 0); |
| 134 | goto out; |
| 135 | } |
| 136 | return 1; |
| 137 | redirty: |
| 138 | redirty_page_for_writepage(wbc, page); |
| 139 | out: |
| 140 | unlock_page(page); |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * gfs2_writeback_writepage - Write page for writeback mappings |
| 146 | * @page: The page |
| 147 | * @wbc: The writeback control |
| 148 | * |
| 149 | */ |
| 150 | |
| 151 | static int gfs2_writeback_writepage(struct page *page, |
| 152 | struct writeback_control *wbc) |
| 153 | { |
| 154 | int ret; |
| 155 | |
| 156 | ret = gfs2_writepage_common(page, wbc); |
| 157 | if (ret <= 0) |
| 158 | return ret; |
| 159 | |
| 160 | ret = mpage_writepage(page, gfs2_get_block_noalloc, wbc); |
| 161 | if (ret == -EAGAIN) |
| 162 | ret = block_write_full_page(page, gfs2_get_block_noalloc, wbc); |
| 163 | return ret; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * gfs2_ordered_writepage - Write page for ordered data files |
| 168 | * @page: The page to write |
| 169 | * @wbc: The writeback control |
| 170 | * |
| 171 | */ |
| 172 | |
| 173 | static int gfs2_ordered_writepage(struct page *page, |
| 174 | struct writeback_control *wbc) |
| 175 | { |
| 176 | struct inode *inode = page->mapping->host; |
| 177 | struct gfs2_inode *ip = GFS2_I(inode); |
| 178 | int ret; |
| 179 | |
| 180 | ret = gfs2_writepage_common(page, wbc); |
| 181 | if (ret <= 0) |
| 182 | return ret; |
| 183 | |
| 184 | if (!page_has_buffers(page)) { |
| 185 | create_empty_buffers(page, inode->i_sb->s_blocksize, |
| 186 | (1 << BH_Dirty)|(1 << BH_Uptodate)); |
| 187 | } |
| 188 | gfs2_page_add_databufs(ip, page, 0, inode->i_sb->s_blocksize-1); |
| 189 | return block_write_full_page(page, gfs2_get_block_noalloc, wbc); |
| 190 | } |
| 191 | |
| 192 | /** |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 193 | * __gfs2_jdata_writepage - The core of jdata writepage |
| 194 | * @page: The page to write |
| 195 | * @wbc: The writeback control |
| 196 | * |
| 197 | * This is shared between writepage and writepages and implements the |
| 198 | * core of the writepage operation. If a transaction is required then |
| 199 | * PageChecked will have been set and the transaction will have |
| 200 | * already been started before this is called. |
| 201 | */ |
| 202 | |
| 203 | static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) |
| 204 | { |
| 205 | struct inode *inode = page->mapping->host; |
| 206 | struct gfs2_inode *ip = GFS2_I(inode); |
| 207 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 208 | |
| 209 | if (PageChecked(page)) { |
| 210 | ClearPageChecked(page); |
| 211 | if (!page_has_buffers(page)) { |
| 212 | create_empty_buffers(page, inode->i_sb->s_blocksize, |
| 213 | (1 << BH_Dirty)|(1 << BH_Uptodate)); |
| 214 | } |
| 215 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); |
| 216 | } |
| 217 | return block_write_full_page(page, gfs2_get_block_noalloc, wbc); |
| 218 | } |
| 219 | |
| 220 | /** |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 221 | * gfs2_jdata_writepage - Write complete page |
| 222 | * @page: Page to write |
| 223 | * |
| 224 | * Returns: errno |
| 225 | * |
| 226 | */ |
| 227 | |
| 228 | static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) |
| 229 | { |
| 230 | struct inode *inode = page->mapping->host; |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 231 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 232 | int error; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 233 | int done_trans = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 234 | |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 235 | error = gfs2_writepage_common(page, wbc); |
| 236 | if (error <= 0) |
| 237 | return error; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 238 | |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 239 | if (PageChecked(page)) { |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 240 | if (wbc->sync_mode != WB_SYNC_ALL) |
| 241 | goto out_ignore; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 242 | error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); |
| 243 | if (error) |
| 244 | goto out_ignore; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 245 | done_trans = 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 246 | } |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 247 | error = __gfs2_jdata_writepage(page, wbc); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 248 | if (done_trans) |
| 249 | gfs2_trans_end(sdp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 250 | return error; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 251 | |
| 252 | out_ignore: |
| 253 | redirty_page_for_writepage(wbc, page); |
| 254 | unlock_page(page); |
| 255 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | /** |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 259 | * gfs2_writeback_writepages - Write a bunch of dirty pages back to disk |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 260 | * @mapping: The mapping to write |
| 261 | * @wbc: Write-back control |
| 262 | * |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 263 | * For the data=writeback case we can already ignore buffer heads |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 264 | * and write whole extents at once. This is a big reduction in the |
| 265 | * number of I/O requests we send and the bmap calls we make in this case. |
| 266 | */ |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 267 | static int gfs2_writeback_writepages(struct address_space *mapping, |
| 268 | struct writeback_control *wbc) |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 269 | { |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 270 | return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | /** |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 274 | * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages |
| 275 | * @mapping: The mapping |
| 276 | * @wbc: The writeback control |
| 277 | * @writepage: The writepage function to call for each page |
| 278 | * @pvec: The vector of pages |
| 279 | * @nr_pages: The number of pages to write |
| 280 | * |
| 281 | * Returns: non-zero if loop should terminate, zero otherwise |
| 282 | */ |
| 283 | |
| 284 | static int gfs2_write_jdata_pagevec(struct address_space *mapping, |
| 285 | struct writeback_control *wbc, |
| 286 | struct pagevec *pvec, |
| 287 | int nr_pages, pgoff_t end) |
| 288 | { |
| 289 | struct inode *inode = mapping->host; |
| 290 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 291 | loff_t i_size = i_size_read(inode); |
| 292 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
| 293 | unsigned offset = i_size & (PAGE_CACHE_SIZE-1); |
| 294 | unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); |
| 295 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
| 296 | int i; |
| 297 | int ret; |
| 298 | |
| 299 | ret = gfs2_trans_begin(sdp, nrblocks, 0); |
| 300 | if (ret < 0) |
| 301 | return ret; |
| 302 | |
| 303 | for(i = 0; i < nr_pages; i++) { |
| 304 | struct page *page = pvec->pages[i]; |
| 305 | |
| 306 | lock_page(page); |
| 307 | |
| 308 | if (unlikely(page->mapping != mapping)) { |
| 309 | unlock_page(page); |
| 310 | continue; |
| 311 | } |
| 312 | |
| 313 | if (!wbc->range_cyclic && page->index > end) { |
| 314 | ret = 1; |
| 315 | unlock_page(page); |
| 316 | continue; |
| 317 | } |
| 318 | |
| 319 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 320 | wait_on_page_writeback(page); |
| 321 | |
| 322 | if (PageWriteback(page) || |
| 323 | !clear_page_dirty_for_io(page)) { |
| 324 | unlock_page(page); |
| 325 | continue; |
| 326 | } |
| 327 | |
| 328 | /* Is the page fully outside i_size? (truncate in progress) */ |
| 329 | if (page->index > end_index || (page->index == end_index && !offset)) { |
| 330 | page->mapping->a_ops->invalidatepage(page, 0); |
| 331 | unlock_page(page); |
| 332 | continue; |
| 333 | } |
| 334 | |
| 335 | ret = __gfs2_jdata_writepage(page, wbc); |
| 336 | |
| 337 | if (ret || (--(wbc->nr_to_write) <= 0)) |
| 338 | ret = 1; |
| 339 | if (wbc->nonblocking && bdi_write_congested(bdi)) { |
| 340 | wbc->encountered_congestion = 1; |
| 341 | ret = 1; |
| 342 | } |
| 343 | |
| 344 | } |
| 345 | gfs2_trans_end(sdp); |
| 346 | return ret; |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * gfs2_write_cache_jdata - Like write_cache_pages but different |
| 351 | * @mapping: The mapping to write |
| 352 | * @wbc: The writeback control |
| 353 | * @writepage: The writepage function to call |
| 354 | * @data: The data to pass to writepage |
| 355 | * |
| 356 | * The reason that we use our own function here is that we need to |
| 357 | * start transactions before we grab page locks. This allows us |
| 358 | * to get the ordering right. |
| 359 | */ |
| 360 | |
| 361 | static int gfs2_write_cache_jdata(struct address_space *mapping, |
| 362 | struct writeback_control *wbc) |
| 363 | { |
| 364 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
| 365 | int ret = 0; |
| 366 | int done = 0; |
| 367 | struct pagevec pvec; |
| 368 | int nr_pages; |
| 369 | pgoff_t index; |
| 370 | pgoff_t end; |
| 371 | int scanned = 0; |
| 372 | int range_whole = 0; |
| 373 | |
| 374 | if (wbc->nonblocking && bdi_write_congested(bdi)) { |
| 375 | wbc->encountered_congestion = 1; |
| 376 | return 0; |
| 377 | } |
| 378 | |
| 379 | pagevec_init(&pvec, 0); |
| 380 | if (wbc->range_cyclic) { |
| 381 | index = mapping->writeback_index; /* Start from prev offset */ |
| 382 | end = -1; |
| 383 | } else { |
| 384 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 385 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 386 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 387 | range_whole = 1; |
| 388 | scanned = 1; |
| 389 | } |
| 390 | |
| 391 | retry: |
| 392 | while (!done && (index <= end) && |
| 393 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
| 394 | PAGECACHE_TAG_DIRTY, |
| 395 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { |
| 396 | scanned = 1; |
| 397 | ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end); |
| 398 | if (ret) |
| 399 | done = 1; |
| 400 | if (ret > 0) |
| 401 | ret = 0; |
| 402 | |
| 403 | pagevec_release(&pvec); |
| 404 | cond_resched(); |
| 405 | } |
| 406 | |
| 407 | if (!scanned && !done) { |
| 408 | /* |
| 409 | * We hit the last page and there is more work to be done: wrap |
| 410 | * back to the start of the file |
| 411 | */ |
| 412 | scanned = 1; |
| 413 | index = 0; |
| 414 | goto retry; |
| 415 | } |
| 416 | |
| 417 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
| 418 | mapping->writeback_index = index; |
| 419 | return ret; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | /** |
| 424 | * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk |
| 425 | * @mapping: The mapping to write |
| 426 | * @wbc: The writeback control |
| 427 | * |
| 428 | */ |
| 429 | |
| 430 | static int gfs2_jdata_writepages(struct address_space *mapping, |
| 431 | struct writeback_control *wbc) |
| 432 | { |
| 433 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
| 434 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); |
| 435 | int ret; |
| 436 | |
| 437 | ret = gfs2_write_cache_jdata(mapping, wbc); |
| 438 | if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { |
| 439 | gfs2_log_flush(sdp, ip->i_gl); |
| 440 | ret = gfs2_write_cache_jdata(mapping, wbc); |
| 441 | } |
| 442 | return ret; |
| 443 | } |
| 444 | |
| 445 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 446 | * stuffed_readpage - Fill in a Linux page with stuffed file data |
| 447 | * @ip: the inode |
| 448 | * @page: the page |
| 449 | * |
| 450 | * Returns: errno |
| 451 | */ |
| 452 | |
| 453 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) |
| 454 | { |
| 455 | struct buffer_head *dibh; |
| 456 | void *kaddr; |
| 457 | int error; |
| 458 | |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 459 | /* |
| 460 | * Due to the order of unstuffing files and ->nopage(), we can be |
| 461 | * asked for a zero page in the case of a stuffed file being extended, |
| 462 | * so we need to supply one here. It doesn't happen often. |
| 463 | */ |
| 464 | if (unlikely(page->index)) { |
Steven Whitehouse | 2840501 | 2007-06-18 16:31:42 +0100 | [diff] [blame] | 465 | zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0); |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 466 | return 0; |
| 467 | } |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 468 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 469 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 470 | if (error) |
| 471 | return error; |
| 472 | |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 473 | kaddr = kmap_atomic(page, KM_USER0); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 474 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 475 | ip->i_di.di_size); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 476 | memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size); |
Russell Cattelan | c312c4f | 2006-10-12 09:23:41 -0400 | [diff] [blame] | 477 | kunmap_atomic(kaddr, KM_USER0); |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 478 | flush_dcache_page(page); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 479 | brelse(dibh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 480 | SetPageUptodate(page); |
| 481 | |
| 482 | return 0; |
| 483 | } |
| 484 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 485 | |
| 486 | /** |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 487 | * __gfs2_readpage - readpage |
| 488 | * @file: The file to read a page for |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 489 | * @page: The page to read |
| 490 | * |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 491 | * This is the core of gfs2's readpage. Its used by the internal file |
| 492 | * reading code as in that case we already hold the glock. Also its |
| 493 | * called by gfs2_readpage() once the required lock has been granted. |
| 494 | * |
| 495 | */ |
| 496 | |
| 497 | static int __gfs2_readpage(void *file, struct page *page) |
| 498 | { |
| 499 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
| 500 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
| 501 | int error; |
| 502 | |
| 503 | if (gfs2_is_stuffed(ip)) { |
| 504 | error = stuffed_readpage(ip, page); |
| 505 | unlock_page(page); |
| 506 | } else { |
| 507 | error = mpage_readpage(page, gfs2_get_block); |
| 508 | } |
| 509 | |
| 510 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 511 | return -EIO; |
| 512 | |
| 513 | return error; |
| 514 | } |
| 515 | |
| 516 | /** |
| 517 | * gfs2_readpage - read a page of a file |
| 518 | * @file: The file to read |
| 519 | * @page: The page of the file |
| 520 | * |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 521 | * This deals with the locking required. We use a trylock in order to |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 522 | * avoid the page lock / glock ordering problems returning AOP_TRUNCATED_PAGE |
| 523 | * in the event that we are unable to get the lock. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 524 | */ |
| 525 | |
| 526 | static int gfs2_readpage(struct file *file, struct page *page) |
| 527 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 528 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 529 | struct gfs2_holder gh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 530 | int error; |
| 531 | |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 532 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh); |
| 533 | error = gfs2_glock_nq_atime(&gh); |
| 534 | if (unlikely(error)) { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 535 | unlock_page(page); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 536 | goto out; |
Steven Whitehouse | 61a30dc | 2006-02-15 10:15:18 +0000 | [diff] [blame] | 537 | } |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 538 | error = __gfs2_readpage(file, page); |
| 539 | gfs2_glock_dq(&gh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 540 | out: |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 541 | gfs2_holder_uninit(&gh); |
Josef Whiter | a13cbe3 | 2007-02-23 12:49:51 -0500 | [diff] [blame] | 542 | if (error == GLR_TRYFAILED) { |
Josef Whiter | a13cbe3 | 2007-02-23 12:49:51 -0500 | [diff] [blame] | 543 | yield(); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 544 | return AOP_TRUNCATED_PAGE; |
Josef Whiter | a13cbe3 | 2007-02-23 12:49:51 -0500 | [diff] [blame] | 545 | } |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 546 | return error; |
| 547 | } |
| 548 | |
| 549 | /** |
| 550 | * gfs2_internal_read - read an internal file |
| 551 | * @ip: The gfs2 inode |
| 552 | * @ra_state: The readahead state (or NULL for no readahead) |
| 553 | * @buf: The buffer to fill |
| 554 | * @pos: The file position |
| 555 | * @size: The amount to read |
| 556 | * |
| 557 | */ |
| 558 | |
| 559 | int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, |
| 560 | char *buf, loff_t *pos, unsigned size) |
| 561 | { |
| 562 | struct address_space *mapping = ip->i_inode.i_mapping; |
| 563 | unsigned long index = *pos / PAGE_CACHE_SIZE; |
| 564 | unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); |
| 565 | unsigned copied = 0; |
| 566 | unsigned amt; |
| 567 | struct page *page; |
| 568 | void *p; |
| 569 | |
| 570 | do { |
| 571 | amt = size - copied; |
| 572 | if (offset + size > PAGE_CACHE_SIZE) |
| 573 | amt = PAGE_CACHE_SIZE - offset; |
| 574 | page = read_cache_page(mapping, index, __gfs2_readpage, NULL); |
| 575 | if (IS_ERR(page)) |
| 576 | return PTR_ERR(page); |
| 577 | p = kmap_atomic(page, KM_USER0); |
| 578 | memcpy(buf + copied, p + offset, amt); |
| 579 | kunmap_atomic(p, KM_USER0); |
| 580 | mark_page_accessed(page); |
| 581 | page_cache_release(page); |
| 582 | copied += amt; |
| 583 | index++; |
| 584 | offset = 0; |
| 585 | } while(copied < size); |
| 586 | (*pos) += size; |
| 587 | return size; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 588 | } |
| 589 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 590 | /** |
| 591 | * gfs2_readpages - Read a bunch of pages at once |
| 592 | * |
| 593 | * Some notes: |
| 594 | * 1. This is only for readahead, so we can simply ignore any things |
| 595 | * which are slightly inconvenient (such as locking conflicts between |
| 596 | * the page lock and the glock) and return having done no I/O. Its |
| 597 | * obviously not something we'd want to do on too regular a basis. |
| 598 | * Any I/O we ignore at this time will be done via readpage later. |
Steven Whitehouse | e1d5b18 | 2006-12-15 16:49:51 -0500 | [diff] [blame] | 599 | * 2. We don't handle stuffed files here we let readpage do the honours. |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 600 | * 3. mpage_readpages() does most of the heavy lifting in the common case. |
| 601 | * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places. |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 602 | */ |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 603 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 604 | static int gfs2_readpages(struct file *file, struct address_space *mapping, |
| 605 | struct list_head *pages, unsigned nr_pages) |
| 606 | { |
| 607 | struct inode *inode = mapping->host; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 608 | struct gfs2_inode *ip = GFS2_I(inode); |
| 609 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 610 | struct gfs2_holder gh; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 611 | int ret; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 612 | |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 613 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 614 | ret = gfs2_glock_nq_atime(&gh); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 615 | if (unlikely(ret)) |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 616 | goto out_uninit; |
Steven Whitehouse | e1d5b18 | 2006-12-15 16:49:51 -0500 | [diff] [blame] | 617 | if (!gfs2_is_stuffed(ip)) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 618 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 619 | gfs2_glock_dq(&gh); |
| 620 | out_uninit: |
| 621 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 622 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 623 | ret = -EIO; |
| 624 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | /** |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 628 | * gfs2_write_begin - Begin to write to a file |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 629 | * @file: The file to write to |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 630 | * @mapping: The mapping in which to write |
| 631 | * @pos: The file offset at which to start writing |
| 632 | * @len: Length of the write |
| 633 | * @flags: Various flags |
| 634 | * @pagep: Pointer to return the page |
| 635 | * @fsdata: Pointer to return fs data (unused by GFS2) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 636 | * |
| 637 | * Returns: errno |
| 638 | */ |
| 639 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 640 | static int gfs2_write_begin(struct file *file, struct address_space *mapping, |
| 641 | loff_t pos, unsigned len, unsigned flags, |
| 642 | struct page **pagep, void **fsdata) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 643 | { |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 644 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
| 645 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 646 | unsigned int data_blocks, ind_blocks, rblocks; |
| 647 | int alloc_required; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 648 | int error = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 649 | struct gfs2_alloc *al; |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 650 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
| 651 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); |
| 652 | unsigned to = from + len; |
| 653 | struct page *page; |
Russell Cattelan | 52ae7b7 | 2006-10-09 12:11:54 -0500 | [diff] [blame] | 654 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 655 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &ip->i_gh); |
Steven Whitehouse | dcd2479 | 2006-11-16 11:08:16 -0500 | [diff] [blame] | 656 | error = gfs2_glock_nq_atime(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 657 | if (unlikely(error)) |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 658 | goto out_uninit; |
| 659 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 660 | gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 661 | error = gfs2_write_alloc_required(ip, pos, len, &alloc_required); |
| 662 | if (error) |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 663 | goto out_unlock; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 664 | |
Steven Whitehouse | f5c5480 | 2006-10-10 13:45:15 -0400 | [diff] [blame] | 665 | ip->i_alloc.al_requested = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 666 | if (alloc_required) { |
| 667 | al = gfs2_alloc_get(ip); |
| 668 | |
| 669 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 670 | if (error) |
| 671 | goto out_alloc_put; |
| 672 | |
Steven Whitehouse | 2933f92 | 2006-11-01 13:23:29 -0500 | [diff] [blame] | 673 | error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 674 | if (error) |
| 675 | goto out_qunlock; |
| 676 | |
| 677 | al->al_requested = data_blocks + ind_blocks; |
| 678 | error = gfs2_inplace_reserve(ip); |
| 679 | if (error) |
| 680 | goto out_qunlock; |
| 681 | } |
| 682 | |
| 683 | rblocks = RES_DINODE + ind_blocks; |
| 684 | if (gfs2_is_jdata(ip)) |
| 685 | rblocks += data_blocks ? data_blocks : 1; |
| 686 | if (ind_blocks || data_blocks) |
| 687 | rblocks += RES_STATFS + RES_QUOTA; |
| 688 | |
Steven Whitehouse | 16615be | 2007-09-17 10:59:52 +0100 | [diff] [blame] | 689 | error = gfs2_trans_begin(sdp, rblocks, |
| 690 | PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 691 | if (error) |
Steven Whitehouse | a867bb2 | 2007-07-17 10:29:02 +0100 | [diff] [blame] | 692 | goto out_trans_fail; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 693 | |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 694 | error = -ENOMEM; |
| 695 | page = __grab_cache_page(mapping, index); |
| 696 | *pagep = page; |
| 697 | if (unlikely(!page)) |
| 698 | goto out_endtrans; |
| 699 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 700 | if (gfs2_is_stuffed(ip)) { |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 701 | error = 0; |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 702 | if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 703 | error = gfs2_unstuff_dinode(ip, page); |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 704 | if (error == 0) |
| 705 | goto prepare_write; |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 706 | } else if (!PageUptodate(page)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 707 | error = stuffed_readpage(ip, page); |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 708 | } |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 709 | goto out; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 710 | } |
| 711 | |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 712 | prepare_write: |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 713 | error = block_prepare_write(page, from, to, gfs2_get_block); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 714 | out: |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 715 | if (error == 0) |
| 716 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 717 | |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 718 | page_cache_release(page); |
| 719 | if (pos + len > ip->i_inode.i_size) |
| 720 | vmtruncate(&ip->i_inode, ip->i_inode.i_size); |
| 721 | out_endtrans: |
| 722 | gfs2_trans_end(sdp); |
| 723 | out_trans_fail: |
| 724 | if (alloc_required) { |
| 725 | gfs2_inplace_release(ip); |
| 726 | out_qunlock: |
| 727 | gfs2_quota_unlock(ip); |
| 728 | out_alloc_put: |
| 729 | gfs2_alloc_put(ip); |
| 730 | } |
| 731 | out_unlock: |
| 732 | gfs2_glock_dq(&ip->i_gh); |
| 733 | out_uninit: |
| 734 | gfs2_holder_uninit(&ip->i_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 735 | return error; |
| 736 | } |
| 737 | |
| 738 | /** |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 739 | * adjust_fs_space - Adjusts the free space available due to gfs2_grow |
| 740 | * @inode: the rindex inode |
| 741 | */ |
| 742 | static void adjust_fs_space(struct inode *inode) |
| 743 | { |
| 744 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
| 745 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
| 746 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
| 747 | u64 fs_total, new_free; |
| 748 | |
| 749 | /* Total up the file system space, according to the latest rindex. */ |
| 750 | fs_total = gfs2_ri_total(sdp); |
| 751 | |
| 752 | spin_lock(&sdp->sd_statfs_spin); |
| 753 | if (fs_total > (m_sc->sc_total + l_sc->sc_total)) |
| 754 | new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); |
| 755 | else |
| 756 | new_free = 0; |
| 757 | spin_unlock(&sdp->sd_statfs_spin); |
Robert Peterson | 6c53267 | 2007-05-10 16:54:38 -0500 | [diff] [blame] | 758 | fs_warn(sdp, "File system extended by %llu blocks.\n", |
| 759 | (unsigned long long)new_free); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 760 | gfs2_statfs_change(sdp, new_free, new_free, 0); |
| 761 | } |
| 762 | |
| 763 | /** |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 764 | * gfs2_stuffed_write_end - Write end for stuffed files |
| 765 | * @inode: The inode |
| 766 | * @dibh: The buffer_head containing the on-disk inode |
| 767 | * @pos: The file position |
| 768 | * @len: The length of the write |
| 769 | * @copied: How much was actually copied by the VFS |
| 770 | * @page: The page |
| 771 | * |
| 772 | * This copies the data from the page into the inode block after |
| 773 | * the inode data structure itself. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 774 | * |
| 775 | * Returns: errno |
| 776 | */ |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 777 | static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, |
| 778 | loff_t pos, unsigned len, unsigned copied, |
| 779 | struct page *page) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 780 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 781 | struct gfs2_inode *ip = GFS2_I(inode); |
| 782 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 783 | u64 to = pos + copied; |
| 784 | void *kaddr; |
| 785 | unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); |
| 786 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 787 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 788 | BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); |
| 789 | kaddr = kmap_atomic(page, KM_USER0); |
| 790 | memcpy(buf + pos, kaddr + pos, copied); |
| 791 | memset(kaddr + pos + copied, 0, len - copied); |
| 792 | flush_dcache_page(page); |
| 793 | kunmap_atomic(kaddr, KM_USER0); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 794 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 795 | if (!PageUptodate(page)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 796 | SetPageUptodate(page); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 797 | unlock_page(page); |
| 798 | page_cache_release(page); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 799 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 800 | if (inode->i_size < to) { |
| 801 | i_size_write(inode, to); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 802 | ip->i_di.di_size = inode->i_size; |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 803 | di->di_size = cpu_to_be64(inode->i_size); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 804 | mark_inode_dirty(inode); |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 805 | } |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 806 | |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 807 | if (inode == sdp->sd_rindex) |
| 808 | adjust_fs_space(inode); |
| 809 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 810 | brelse(dibh); |
| 811 | gfs2_trans_end(sdp); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 812 | gfs2_glock_dq(&ip->i_gh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 813 | gfs2_holder_uninit(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 814 | return copied; |
| 815 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 816 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 817 | /** |
| 818 | * gfs2_write_end |
| 819 | * @file: The file to write to |
| 820 | * @mapping: The address space to write to |
| 821 | * @pos: The file position |
| 822 | * @len: The length of the data |
| 823 | * @copied: |
| 824 | * @page: The page that has been written |
| 825 | * @fsdata: The fsdata (unused in GFS2) |
| 826 | * |
| 827 | * The main write_end function for GFS2. We have a separate one for |
| 828 | * stuffed files as they are slightly different, otherwise we just |
| 829 | * put our locking around the VFS provided functions. |
| 830 | * |
| 831 | * Returns: errno |
| 832 | */ |
| 833 | |
| 834 | static int gfs2_write_end(struct file *file, struct address_space *mapping, |
| 835 | loff_t pos, unsigned len, unsigned copied, |
| 836 | struct page *page, void *fsdata) |
| 837 | { |
| 838 | struct inode *inode = page->mapping->host; |
| 839 | struct gfs2_inode *ip = GFS2_I(inode); |
| 840 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 841 | struct buffer_head *dibh; |
| 842 | struct gfs2_alloc *al = &ip->i_alloc; |
| 843 | struct gfs2_dinode *di; |
| 844 | unsigned int from = pos & (PAGE_CACHE_SIZE - 1); |
| 845 | unsigned int to = from + len; |
| 846 | int ret; |
| 847 | |
| 848 | BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == 0); |
| 849 | |
| 850 | ret = gfs2_meta_inode_buffer(ip, &dibh); |
| 851 | if (unlikely(ret)) { |
| 852 | unlock_page(page); |
| 853 | page_cache_release(page); |
| 854 | goto failed; |
| 855 | } |
| 856 | |
| 857 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 858 | |
| 859 | if (gfs2_is_stuffed(ip)) |
| 860 | return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); |
| 861 | |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 862 | if (!gfs2_is_writeback(ip)) |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 863 | gfs2_page_add_databufs(ip, page, from, to); |
| 864 | |
| 865 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
| 866 | |
| 867 | if (likely(ret >= 0)) { |
| 868 | copied = ret; |
| 869 | if ((pos + copied) > inode->i_size) { |
| 870 | di = (struct gfs2_dinode *)dibh->b_data; |
| 871 | ip->i_di.di_size = inode->i_size; |
| 872 | di->di_size = cpu_to_be64(inode->i_size); |
| 873 | mark_inode_dirty(inode); |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | if (inode == sdp->sd_rindex) |
| 878 | adjust_fs_space(inode); |
| 879 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 880 | brelse(dibh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 881 | gfs2_trans_end(sdp); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 882 | failed: |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 883 | if (al->al_requested) { |
| 884 | gfs2_inplace_release(ip); |
| 885 | gfs2_quota_unlock(ip); |
| 886 | gfs2_alloc_put(ip); |
| 887 | } |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 888 | gfs2_glock_dq(&ip->i_gh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 889 | gfs2_holder_uninit(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 890 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 891 | } |
| 892 | |
| 893 | /** |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 894 | * gfs2_set_page_dirty - Page dirtying function |
| 895 | * @page: The page to dirty |
| 896 | * |
| 897 | * Returns: 1 if it dirtyed the page, or 0 otherwise |
| 898 | */ |
| 899 | |
| 900 | static int gfs2_set_page_dirty(struct page *page) |
| 901 | { |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 902 | SetPageChecked(page); |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 903 | return __set_page_dirty_buffers(page); |
| 904 | } |
| 905 | |
| 906 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 907 | * gfs2_bmap - Block map function |
| 908 | * @mapping: Address space info |
| 909 | * @lblock: The block to map |
| 910 | * |
| 911 | * Returns: The disk address for the block or 0 on hole or error |
| 912 | */ |
| 913 | |
| 914 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) |
| 915 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 916 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 917 | struct gfs2_holder i_gh; |
| 918 | sector_t dblock = 0; |
| 919 | int error; |
| 920 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 921 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
| 922 | if (error) |
| 923 | return 0; |
| 924 | |
| 925 | if (!gfs2_is_stuffed(ip)) |
Steven Whitehouse | 4ff1467 | 2006-01-30 09:39:10 +0000 | [diff] [blame] | 926 | dblock = generic_block_bmap(mapping, lblock, gfs2_get_block); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 927 | |
| 928 | gfs2_glock_dq_uninit(&i_gh); |
| 929 | |
| 930 | return dblock; |
| 931 | } |
| 932 | |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 933 | static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) |
| 934 | { |
| 935 | struct gfs2_bufdata *bd; |
| 936 | |
| 937 | lock_buffer(bh); |
| 938 | gfs2_log_lock(sdp); |
| 939 | clear_buffer_dirty(bh); |
| 940 | bd = bh->b_private; |
| 941 | if (bd) { |
Steven Whitehouse | 16615be | 2007-09-17 10:59:52 +0100 | [diff] [blame] | 942 | if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh)) |
| 943 | list_del_init(&bd->bd_le.le_list); |
| 944 | else |
| 945 | gfs2_remove_from_journal(bh, current->journal_info, 0); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 946 | } |
| 947 | bh->b_bdev = NULL; |
| 948 | clear_buffer_mapped(bh); |
| 949 | clear_buffer_req(bh); |
| 950 | clear_buffer_new(bh); |
| 951 | gfs2_log_unlock(sdp); |
| 952 | unlock_buffer(bh); |
| 953 | } |
| 954 | |
Steven Whitehouse | 8628de0 | 2006-03-31 16:48:41 -0500 | [diff] [blame] | 955 | static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 956 | { |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 957 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
| 958 | struct buffer_head *bh, *head; |
| 959 | unsigned long pos = 0; |
| 960 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 961 | BUG_ON(!PageLocked(page)); |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 962 | if (offset == 0) |
| 963 | ClearPageChecked(page); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 964 | if (!page_has_buffers(page)) |
| 965 | goto out; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 966 | |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 967 | bh = head = page_buffers(page); |
| 968 | do { |
| 969 | if (offset <= pos) |
| 970 | gfs2_discard(sdp, bh); |
| 971 | pos += bh->b_size; |
| 972 | bh = bh->b_this_page; |
| 973 | } while (bh != head); |
| 974 | out: |
| 975 | if (offset == 0) |
| 976 | try_to_release_page(page, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 977 | } |
| 978 | |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 979 | /** |
| 980 | * gfs2_ok_for_dio - check that dio is valid on this file |
| 981 | * @ip: The inode |
| 982 | * @rw: READ or WRITE |
| 983 | * @offset: The offset at which we are reading or writing |
| 984 | * |
| 985 | * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) |
| 986 | * 1 (to accept the i/o request) |
| 987 | */ |
| 988 | static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) |
| 989 | { |
| 990 | /* |
| 991 | * Should we return an error here? I can't see that O_DIRECT for |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 992 | * a stuffed file makes any sense. For now we'll silently fall |
| 993 | * back to buffered I/O |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 994 | */ |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 995 | if (gfs2_is_stuffed(ip)) |
| 996 | return 0; |
| 997 | |
| 998 | if (offset > i_size_read(&ip->i_inode)) |
| 999 | return 0; |
| 1000 | return 1; |
| 1001 | } |
| 1002 | |
| 1003 | |
| 1004 | |
Steven Whitehouse | a9e5f4d | 2006-07-25 17:24:12 -0400 | [diff] [blame] | 1005 | static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, |
| 1006 | const struct iovec *iov, loff_t offset, |
| 1007 | unsigned long nr_segs) |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1008 | { |
| 1009 | struct file *file = iocb->ki_filp; |
| 1010 | struct inode *inode = file->f_mapping->host; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1011 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1012 | struct gfs2_holder gh; |
| 1013 | int rv; |
| 1014 | |
| 1015 | /* |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1016 | * Deferred lock, even if its a write, since we do no allocation |
| 1017 | * on this path. All we need change is atime, and this lock mode |
| 1018 | * ensures that other nodes have flushed their buffered read caches |
| 1019 | * (i.e. their page cache entries for this inode). We do not, |
| 1020 | * unfortunately have the option of only flushing a range like |
| 1021 | * the VFS does. |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1022 | */ |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1023 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, GL_ATIME, &gh); |
Steven Whitehouse | dcd2479 | 2006-11-16 11:08:16 -0500 | [diff] [blame] | 1024 | rv = gfs2_glock_nq_atime(&gh); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1025 | if (rv) |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1026 | return rv; |
| 1027 | rv = gfs2_ok_for_dio(ip, rw, offset); |
| 1028 | if (rv != 1) |
| 1029 | goto out; /* dio not valid, fall back to buffered i/o */ |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1030 | |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1031 | rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev, |
| 1032 | iov, offset, nr_segs, |
| 1033 | gfs2_get_block_direct, NULL); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1034 | out: |
| 1035 | gfs2_glock_dq_m(1, &gh); |
| 1036 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1037 | return rv; |
| 1038 | } |
| 1039 | |
| 1040 | /** |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1041 | * gfs2_releasepage - free the metadata associated with a page |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1042 | * @page: the page that's being released |
| 1043 | * @gfp_mask: passed from Linux VFS, ignored by us |
| 1044 | * |
| 1045 | * Call try_to_free_buffers() if the buffers in this page can be |
| 1046 | * released. |
| 1047 | * |
| 1048 | * Returns: 0 |
| 1049 | */ |
| 1050 | |
| 1051 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) |
| 1052 | { |
| 1053 | struct inode *aspace = page->mapping->host; |
| 1054 | struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info; |
| 1055 | struct buffer_head *bh, *head; |
| 1056 | struct gfs2_bufdata *bd; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1057 | |
| 1058 | if (!page_has_buffers(page)) |
Steven Whitehouse | 891ba6d | 2007-09-20 15:26:33 +0100 | [diff] [blame] | 1059 | return 0; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1060 | |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1061 | gfs2_log_lock(sdp); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1062 | head = bh = page_buffers(page); |
| 1063 | do { |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1064 | if (atomic_read(&bh->b_count)) |
| 1065 | goto cannot_release; |
| 1066 | bd = bh->b_private; |
| 1067 | if (bd && bd->bd_ail) |
| 1068 | goto cannot_release; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1069 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1070 | gfs2_assert_warn(sdp, !buffer_dirty(bh)); |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1071 | bh = bh->b_this_page; |
| 1072 | } while(bh != head); |
| 1073 | gfs2_log_unlock(sdp); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1074 | |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1075 | head = bh = page_buffers(page); |
| 1076 | do { |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1077 | gfs2_log_lock(sdp); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1078 | bd = bh->b_private; |
| 1079 | if (bd) { |
| 1080 | gfs2_assert_warn(sdp, bd->bd_bh == bh); |
| 1081 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 1082 | if (!list_empty(&bd->bd_le.le_list)) { |
| 1083 | if (!buffer_pinned(bh)) |
| 1084 | list_del_init(&bd->bd_le.le_list); |
| 1085 | else |
| 1086 | bd = NULL; |
| 1087 | } |
| 1088 | if (bd) |
| 1089 | bd->bd_bh = NULL; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1090 | bh->b_private = NULL; |
| 1091 | } |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1092 | gfs2_log_unlock(sdp); |
| 1093 | if (bd) |
| 1094 | kmem_cache_free(gfs2_bufdata_cachep, bd); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1095 | |
| 1096 | bh = bh->b_this_page; |
Steven Whitehouse | 166afcc | 2006-08-24 15:59:40 -0400 | [diff] [blame] | 1097 | } while (bh != head); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1098 | |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1099 | return try_to_free_buffers(page); |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1100 | cannot_release: |
| 1101 | gfs2_log_unlock(sdp); |
| 1102 | return 0; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1103 | } |
| 1104 | |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1105 | static const struct address_space_operations gfs2_writeback_aops = { |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 1106 | .writepage = gfs2_writeback_writepage, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1107 | .writepages = gfs2_writeback_writepages, |
| 1108 | .readpage = gfs2_readpage, |
| 1109 | .readpages = gfs2_readpages, |
| 1110 | .sync_page = block_sync_page, |
| 1111 | .write_begin = gfs2_write_begin, |
| 1112 | .write_end = gfs2_write_end, |
| 1113 | .bmap = gfs2_bmap, |
| 1114 | .invalidatepage = gfs2_invalidatepage, |
| 1115 | .releasepage = gfs2_releasepage, |
| 1116 | .direct_IO = gfs2_direct_IO, |
| 1117 | }; |
| 1118 | |
| 1119 | static const struct address_space_operations gfs2_ordered_aops = { |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 1120 | .writepage = gfs2_ordered_writepage, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1121 | .readpage = gfs2_readpage, |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 1122 | .readpages = gfs2_readpages, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1123 | .sync_page = block_sync_page, |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 1124 | .write_begin = gfs2_write_begin, |
| 1125 | .write_end = gfs2_write_end, |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 1126 | .set_page_dirty = gfs2_set_page_dirty, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1127 | .bmap = gfs2_bmap, |
| 1128 | .invalidatepage = gfs2_invalidatepage, |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1129 | .releasepage = gfs2_releasepage, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1130 | .direct_IO = gfs2_direct_IO, |
| 1131 | }; |
| 1132 | |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1133 | static const struct address_space_operations gfs2_jdata_aops = { |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 1134 | .writepage = gfs2_jdata_writepage, |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 1135 | .writepages = gfs2_jdata_writepages, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1136 | .readpage = gfs2_readpage, |
| 1137 | .readpages = gfs2_readpages, |
| 1138 | .sync_page = block_sync_page, |
| 1139 | .write_begin = gfs2_write_begin, |
| 1140 | .write_end = gfs2_write_end, |
| 1141 | .set_page_dirty = gfs2_set_page_dirty, |
| 1142 | .bmap = gfs2_bmap, |
| 1143 | .invalidatepage = gfs2_invalidatepage, |
| 1144 | .releasepage = gfs2_releasepage, |
| 1145 | }; |
| 1146 | |
| 1147 | void gfs2_set_aops(struct inode *inode) |
| 1148 | { |
| 1149 | struct gfs2_inode *ip = GFS2_I(inode); |
| 1150 | |
| 1151 | if (gfs2_is_writeback(ip)) |
| 1152 | inode->i_mapping->a_ops = &gfs2_writeback_aops; |
| 1153 | else if (gfs2_is_ordered(ip)) |
| 1154 | inode->i_mapping->a_ops = &gfs2_ordered_aops; |
| 1155 | else if (gfs2_is_jdata(ip)) |
| 1156 | inode->i_mapping->a_ops = &gfs2_jdata_aops; |
| 1157 | else |
| 1158 | BUG(); |
| 1159 | } |
| 1160 | |