David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Bob Peterson | 7eabb77 | 2008-01-28 11:24:35 -0600 | [diff] [blame] | 3 | * Copyright (C) 2004-2008 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> |
Steven Whitehouse | 47e83b5 | 2007-10-18 11:15:50 +0100 | [diff] [blame] | 22 | #include <linux/backing-dev.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 23 | |
| 24 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 25 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 26 | #include "bmap.h" |
| 27 | #include "glock.h" |
| 28 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 29 | #include "log.h" |
| 30 | #include "meta_io.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 31 | #include "quota.h" |
| 32 | #include "trans.h" |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 33 | #include "rgrp.h" |
Robert Peterson | cd81a4b | 2007-05-14 12:42:18 -0500 | [diff] [blame] | 34 | #include "super.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 35 | #include "util.h" |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 36 | #include "glops.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 37 | |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 38 | |
| 39 | static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, |
| 40 | unsigned int from, unsigned int to) |
| 41 | { |
| 42 | struct buffer_head *head = page_buffers(page); |
| 43 | unsigned int bsize = head->b_size; |
| 44 | struct buffer_head *bh; |
| 45 | unsigned int start, end; |
| 46 | |
| 47 | for (bh = head, start = 0; bh != head || !start; |
| 48 | bh = bh->b_this_page, start = end) { |
| 49 | end = start + bsize; |
| 50 | if (end <= from || start >= to) |
| 51 | continue; |
Benjamin Marzinski | ddf4b42 | 2007-06-01 14:21:38 -0500 | [diff] [blame] | 52 | if (gfs2_is_jdata(ip)) |
| 53 | set_buffer_uptodate(bh); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 54 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
| 55 | } |
| 56 | } |
| 57 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 58 | /** |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 59 | * 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] | 60 | * @inode: The inode |
| 61 | * @lblock: The block number to look up |
| 62 | * @bh_result: The buffer head to return the result in |
| 63 | * @create: Non-zero if we may add block to the file |
| 64 | * |
| 65 | * Returns: errno |
| 66 | */ |
| 67 | |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 68 | static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, |
| 69 | struct buffer_head *bh_result, int create) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 70 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 71 | int error; |
| 72 | |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 73 | error = gfs2_block_map(inode, lblock, bh_result, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 74 | if (error) |
| 75 | return error; |
Wendy Cheng | de986e8 | 2007-09-18 09:19:13 -0400 | [diff] [blame] | 76 | if (!buffer_mapped(bh_result)) |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 77 | return -EIO; |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 78 | return 0; |
| 79 | } |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 80 | |
| 81 | static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, |
| 82 | struct buffer_head *bh_result, int create) |
| 83 | { |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 84 | return gfs2_block_map(inode, lblock, bh_result, 0); |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 85 | } |
| 86 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 87 | /** |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 88 | * gfs2_writepage_common - Common bits of writepage |
| 89 | * @page: The page to be written |
| 90 | * @wbc: The writeback control |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 91 | * |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 92 | * 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] | 93 | */ |
| 94 | |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 95 | static int gfs2_writepage_common(struct page *page, |
| 96 | struct writeback_control *wbc) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 97 | { |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 98 | struct inode *inode = page->mapping->host; |
Steven Whitehouse | f438714 | 2006-08-08 13:23:19 -0400 | [diff] [blame] | 99 | struct gfs2_inode *ip = GFS2_I(inode); |
| 100 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 101 | loff_t i_size = i_size_read(inode); |
| 102 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
| 103 | unsigned offset; |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 104 | |
| 105 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) |
| 106 | goto out; |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 107 | if (current->journal_info) |
| 108 | goto redirty; |
| 109 | /* Is the page fully outside i_size? (truncate in progress) */ |
| 110 | offset = i_size & (PAGE_CACHE_SIZE-1); |
| 111 | if (page->index > end_index || (page->index == end_index && !offset)) { |
| 112 | page->mapping->a_ops->invalidatepage(page, 0); |
| 113 | goto out; |
| 114 | } |
| 115 | return 1; |
| 116 | redirty: |
| 117 | redirty_page_for_writepage(wbc, page); |
| 118 | out: |
| 119 | unlock_page(page); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * gfs2_writeback_writepage - Write page for writeback mappings |
| 125 | * @page: The page |
| 126 | * @wbc: The writeback control |
| 127 | * |
| 128 | */ |
| 129 | |
| 130 | static int gfs2_writeback_writepage(struct page *page, |
| 131 | struct writeback_control *wbc) |
| 132 | { |
| 133 | int ret; |
| 134 | |
| 135 | ret = gfs2_writepage_common(page, wbc); |
| 136 | if (ret <= 0) |
| 137 | return ret; |
| 138 | |
Steven Whitehouse | 30116ff | 2010-06-14 09:58:41 +0100 | [diff] [blame] | 139 | return nobh_writepage(page, gfs2_get_block_noalloc, wbc); |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | /** |
| 143 | * gfs2_ordered_writepage - Write page for ordered data files |
| 144 | * @page: The page to write |
| 145 | * @wbc: The writeback control |
| 146 | * |
| 147 | */ |
| 148 | |
| 149 | static int gfs2_ordered_writepage(struct page *page, |
| 150 | struct writeback_control *wbc) |
| 151 | { |
| 152 | struct inode *inode = page->mapping->host; |
| 153 | struct gfs2_inode *ip = GFS2_I(inode); |
| 154 | int ret; |
| 155 | |
| 156 | ret = gfs2_writepage_common(page, wbc); |
| 157 | if (ret <= 0) |
| 158 | return ret; |
| 159 | |
| 160 | if (!page_has_buffers(page)) { |
| 161 | create_empty_buffers(page, inode->i_sb->s_blocksize, |
| 162 | (1 << BH_Dirty)|(1 << BH_Uptodate)); |
| 163 | } |
| 164 | gfs2_page_add_databufs(ip, page, 0, inode->i_sb->s_blocksize-1); |
| 165 | return block_write_full_page(page, gfs2_get_block_noalloc, wbc); |
| 166 | } |
| 167 | |
| 168 | /** |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 169 | * __gfs2_jdata_writepage - The core of jdata writepage |
| 170 | * @page: The page to write |
| 171 | * @wbc: The writeback control |
| 172 | * |
| 173 | * This is shared between writepage and writepages and implements the |
| 174 | * core of the writepage operation. If a transaction is required then |
| 175 | * PageChecked will have been set and the transaction will have |
| 176 | * already been started before this is called. |
| 177 | */ |
| 178 | |
| 179 | static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) |
| 180 | { |
| 181 | struct inode *inode = page->mapping->host; |
| 182 | struct gfs2_inode *ip = GFS2_I(inode); |
| 183 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 184 | |
| 185 | if (PageChecked(page)) { |
| 186 | ClearPageChecked(page); |
| 187 | if (!page_has_buffers(page)) { |
| 188 | create_empty_buffers(page, inode->i_sb->s_blocksize, |
| 189 | (1 << BH_Dirty)|(1 << BH_Uptodate)); |
| 190 | } |
| 191 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); |
| 192 | } |
| 193 | return block_write_full_page(page, gfs2_get_block_noalloc, wbc); |
| 194 | } |
| 195 | |
| 196 | /** |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 197 | * gfs2_jdata_writepage - Write complete page |
| 198 | * @page: Page to write |
| 199 | * |
| 200 | * Returns: errno |
| 201 | * |
| 202 | */ |
| 203 | |
| 204 | static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) |
| 205 | { |
| 206 | struct inode *inode = page->mapping->host; |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 207 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 1bb7322 | 2008-10-15 09:46:39 +0100 | [diff] [blame] | 208 | int ret; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 209 | int done_trans = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 210 | |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 211 | if (PageChecked(page)) { |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 212 | if (wbc->sync_mode != WB_SYNC_ALL) |
| 213 | goto out_ignore; |
Steven Whitehouse | 1bb7322 | 2008-10-15 09:46:39 +0100 | [diff] [blame] | 214 | ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); |
| 215 | if (ret) |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 216 | goto out_ignore; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 217 | done_trans = 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 218 | } |
Steven Whitehouse | 1bb7322 | 2008-10-15 09:46:39 +0100 | [diff] [blame] | 219 | ret = gfs2_writepage_common(page, wbc); |
| 220 | if (ret > 0) |
| 221 | ret = __gfs2_jdata_writepage(page, wbc); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 222 | if (done_trans) |
| 223 | gfs2_trans_end(sdp); |
Steven Whitehouse | 1bb7322 | 2008-10-15 09:46:39 +0100 | [diff] [blame] | 224 | return ret; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 225 | |
| 226 | out_ignore: |
| 227 | redirty_page_for_writepage(wbc, page); |
| 228 | unlock_page(page); |
| 229 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | /** |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 233 | * gfs2_writeback_writepages - Write a bunch of dirty pages back to disk |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 234 | * @mapping: The mapping to write |
| 235 | * @wbc: Write-back control |
| 236 | * |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 237 | * For the data=writeback case we can already ignore buffer heads |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 238 | * and write whole extents at once. This is a big reduction in the |
| 239 | * number of I/O requests we send and the bmap calls we make in this case. |
| 240 | */ |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 241 | static int gfs2_writeback_writepages(struct address_space *mapping, |
| 242 | struct writeback_control *wbc) |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 243 | { |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 244 | return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | /** |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 248 | * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages |
| 249 | * @mapping: The mapping |
| 250 | * @wbc: The writeback control |
| 251 | * @writepage: The writepage function to call for each page |
| 252 | * @pvec: The vector of pages |
| 253 | * @nr_pages: The number of pages to write |
| 254 | * |
| 255 | * Returns: non-zero if loop should terminate, zero otherwise |
| 256 | */ |
| 257 | |
| 258 | static int gfs2_write_jdata_pagevec(struct address_space *mapping, |
| 259 | struct writeback_control *wbc, |
| 260 | struct pagevec *pvec, |
| 261 | int nr_pages, pgoff_t end) |
| 262 | { |
| 263 | struct inode *inode = mapping->host; |
| 264 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 265 | loff_t i_size = i_size_read(inode); |
| 266 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
| 267 | unsigned offset = i_size & (PAGE_CACHE_SIZE-1); |
| 268 | unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 269 | int i; |
| 270 | int ret; |
| 271 | |
Abhijith Das | 20b95bf | 2008-03-06 17:43:52 -0600 | [diff] [blame] | 272 | ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 273 | if (ret < 0) |
| 274 | return ret; |
| 275 | |
| 276 | for(i = 0; i < nr_pages; i++) { |
| 277 | struct page *page = pvec->pages[i]; |
| 278 | |
| 279 | lock_page(page); |
| 280 | |
| 281 | if (unlikely(page->mapping != mapping)) { |
| 282 | unlock_page(page); |
| 283 | continue; |
| 284 | } |
| 285 | |
| 286 | if (!wbc->range_cyclic && page->index > end) { |
| 287 | ret = 1; |
| 288 | unlock_page(page); |
| 289 | continue; |
| 290 | } |
| 291 | |
| 292 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 293 | wait_on_page_writeback(page); |
| 294 | |
| 295 | if (PageWriteback(page) || |
| 296 | !clear_page_dirty_for_io(page)) { |
| 297 | unlock_page(page); |
| 298 | continue; |
| 299 | } |
| 300 | |
| 301 | /* Is the page fully outside i_size? (truncate in progress) */ |
| 302 | if (page->index > end_index || (page->index == end_index && !offset)) { |
| 303 | page->mapping->a_ops->invalidatepage(page, 0); |
| 304 | unlock_page(page); |
| 305 | continue; |
| 306 | } |
| 307 | |
| 308 | ret = __gfs2_jdata_writepage(page, wbc); |
| 309 | |
| 310 | if (ret || (--(wbc->nr_to_write) <= 0)) |
| 311 | ret = 1; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 312 | } |
| 313 | gfs2_trans_end(sdp); |
| 314 | return ret; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * gfs2_write_cache_jdata - Like write_cache_pages but different |
| 319 | * @mapping: The mapping to write |
| 320 | * @wbc: The writeback control |
| 321 | * @writepage: The writepage function to call |
| 322 | * @data: The data to pass to writepage |
| 323 | * |
| 324 | * The reason that we use our own function here is that we need to |
| 325 | * start transactions before we grab page locks. This allows us |
| 326 | * to get the ordering right. |
| 327 | */ |
| 328 | |
| 329 | static int gfs2_write_cache_jdata(struct address_space *mapping, |
| 330 | struct writeback_control *wbc) |
| 331 | { |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 332 | int ret = 0; |
| 333 | int done = 0; |
| 334 | struct pagevec pvec; |
| 335 | int nr_pages; |
| 336 | pgoff_t index; |
| 337 | pgoff_t end; |
| 338 | int scanned = 0; |
| 339 | int range_whole = 0; |
| 340 | |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 341 | pagevec_init(&pvec, 0); |
| 342 | if (wbc->range_cyclic) { |
| 343 | index = mapping->writeback_index; /* Start from prev offset */ |
| 344 | end = -1; |
| 345 | } else { |
| 346 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 347 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 348 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 349 | range_whole = 1; |
| 350 | scanned = 1; |
| 351 | } |
| 352 | |
| 353 | retry: |
| 354 | while (!done && (index <= end) && |
| 355 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
| 356 | PAGECACHE_TAG_DIRTY, |
| 357 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { |
| 358 | scanned = 1; |
| 359 | ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end); |
| 360 | if (ret) |
| 361 | done = 1; |
| 362 | if (ret > 0) |
| 363 | ret = 0; |
| 364 | |
| 365 | pagevec_release(&pvec); |
| 366 | cond_resched(); |
| 367 | } |
| 368 | |
| 369 | if (!scanned && !done) { |
| 370 | /* |
| 371 | * We hit the last page and there is more work to be done: wrap |
| 372 | * back to the start of the file |
| 373 | */ |
| 374 | scanned = 1; |
| 375 | index = 0; |
| 376 | goto retry; |
| 377 | } |
| 378 | |
| 379 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
| 380 | mapping->writeback_index = index; |
| 381 | return ret; |
| 382 | } |
| 383 | |
| 384 | |
| 385 | /** |
| 386 | * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk |
| 387 | * @mapping: The mapping to write |
| 388 | * @wbc: The writeback control |
| 389 | * |
| 390 | */ |
| 391 | |
| 392 | static int gfs2_jdata_writepages(struct address_space *mapping, |
| 393 | struct writeback_control *wbc) |
| 394 | { |
| 395 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
| 396 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); |
| 397 | int ret; |
| 398 | |
| 399 | ret = gfs2_write_cache_jdata(mapping, wbc); |
| 400 | if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { |
| 401 | gfs2_log_flush(sdp, ip->i_gl); |
| 402 | ret = gfs2_write_cache_jdata(mapping, wbc); |
| 403 | } |
| 404 | return ret; |
| 405 | } |
| 406 | |
| 407 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 408 | * stuffed_readpage - Fill in a Linux page with stuffed file data |
| 409 | * @ip: the inode |
| 410 | * @page: the page |
| 411 | * |
| 412 | * Returns: errno |
| 413 | */ |
| 414 | |
| 415 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) |
| 416 | { |
| 417 | struct buffer_head *dibh; |
Steven Whitehouse | 602c89d | 2010-03-25 14:32:43 +0000 | [diff] [blame] | 418 | u64 dsize = i_size_read(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 419 | void *kaddr; |
| 420 | int error; |
| 421 | |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 422 | /* |
Nick Piggin | 3c18ddd | 2008-04-28 02:12:10 -0700 | [diff] [blame] | 423 | * Due to the order of unstuffing files and ->fault(), we can be |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 424 | * asked for a zero page in the case of a stuffed file being extended, |
| 425 | * so we need to supply one here. It doesn't happen often. |
| 426 | */ |
| 427 | if (unlikely(page->index)) { |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 428 | zero_user(page, 0, PAGE_CACHE_SIZE); |
Abhijith Das | 0a7ab79 | 2009-01-07 16:03:37 -0600 | [diff] [blame] | 429 | SetPageUptodate(page); |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 430 | return 0; |
| 431 | } |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 432 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 433 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 434 | if (error) |
| 435 | return error; |
| 436 | |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 437 | kaddr = kmap_atomic(page, KM_USER0); |
Steven Whitehouse | 602c89d | 2010-03-25 14:32:43 +0000 | [diff] [blame] | 438 | if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) |
| 439 | dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); |
| 440 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); |
| 441 | memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize); |
Russell Cattelan | c312c4f | 2006-10-12 09:23:41 -0400 | [diff] [blame] | 442 | kunmap_atomic(kaddr, KM_USER0); |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 443 | flush_dcache_page(page); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 444 | brelse(dibh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 445 | SetPageUptodate(page); |
| 446 | |
| 447 | return 0; |
| 448 | } |
| 449 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 450 | |
| 451 | /** |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 452 | * __gfs2_readpage - readpage |
| 453 | * @file: The file to read a page for |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 454 | * @page: The page to read |
| 455 | * |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 456 | * This is the core of gfs2's readpage. Its used by the internal file |
| 457 | * reading code as in that case we already hold the glock. Also its |
| 458 | * called by gfs2_readpage() once the required lock has been granted. |
| 459 | * |
| 460 | */ |
| 461 | |
| 462 | static int __gfs2_readpage(void *file, struct page *page) |
| 463 | { |
| 464 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
| 465 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
| 466 | int error; |
| 467 | |
| 468 | if (gfs2_is_stuffed(ip)) { |
| 469 | error = stuffed_readpage(ip, page); |
| 470 | unlock_page(page); |
| 471 | } else { |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 472 | error = mpage_readpage(page, gfs2_block_map); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 476 | return -EIO; |
| 477 | |
| 478 | return error; |
| 479 | } |
| 480 | |
| 481 | /** |
| 482 | * gfs2_readpage - read a page of a file |
| 483 | * @file: The file to read |
| 484 | * @page: The page of the file |
| 485 | * |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 486 | * This deals with the locking required. We have to unlock and |
| 487 | * relock the page in order to get the locking in the right |
| 488 | * order. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 489 | */ |
| 490 | |
| 491 | static int gfs2_readpage(struct file *file, struct page *page) |
| 492 | { |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 493 | struct address_space *mapping = page->mapping; |
| 494 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 495 | struct gfs2_holder gh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 496 | int error; |
| 497 | |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 498 | unlock_page(page); |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 499 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
| 500 | error = gfs2_glock_nq(&gh); |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 501 | if (unlikely(error)) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 502 | goto out; |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 503 | error = AOP_TRUNCATED_PAGE; |
| 504 | lock_page(page); |
| 505 | if (page->mapping == mapping && !PageUptodate(page)) |
| 506 | error = __gfs2_readpage(file, page); |
| 507 | else |
| 508 | unlock_page(page); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 509 | gfs2_glock_dq(&gh); |
Steven Whitehouse | 7afd88d | 2008-02-22 16:07:18 +0000 | [diff] [blame] | 510 | out: |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 511 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 512 | if (error && error != AOP_TRUNCATED_PAGE) |
| 513 | lock_page(page); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 514 | return error; |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * gfs2_internal_read - read an internal file |
| 519 | * @ip: The gfs2 inode |
| 520 | * @ra_state: The readahead state (or NULL for no readahead) |
| 521 | * @buf: The buffer to fill |
| 522 | * @pos: The file position |
| 523 | * @size: The amount to read |
| 524 | * |
| 525 | */ |
| 526 | |
| 527 | int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, |
| 528 | char *buf, loff_t *pos, unsigned size) |
| 529 | { |
| 530 | struct address_space *mapping = ip->i_inode.i_mapping; |
| 531 | unsigned long index = *pos / PAGE_CACHE_SIZE; |
| 532 | unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); |
| 533 | unsigned copied = 0; |
| 534 | unsigned amt; |
| 535 | struct page *page; |
| 536 | void *p; |
| 537 | |
| 538 | do { |
| 539 | amt = size - copied; |
| 540 | if (offset + size > PAGE_CACHE_SIZE) |
| 541 | amt = PAGE_CACHE_SIZE - offset; |
| 542 | page = read_cache_page(mapping, index, __gfs2_readpage, NULL); |
| 543 | if (IS_ERR(page)) |
| 544 | return PTR_ERR(page); |
| 545 | p = kmap_atomic(page, KM_USER0); |
| 546 | memcpy(buf + copied, p + offset, amt); |
| 547 | kunmap_atomic(p, KM_USER0); |
| 548 | mark_page_accessed(page); |
| 549 | page_cache_release(page); |
| 550 | copied += amt; |
| 551 | index++; |
| 552 | offset = 0; |
| 553 | } while(copied < size); |
| 554 | (*pos) += size; |
| 555 | return size; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 556 | } |
| 557 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 558 | /** |
| 559 | * gfs2_readpages - Read a bunch of pages at once |
| 560 | * |
| 561 | * Some notes: |
| 562 | * 1. This is only for readahead, so we can simply ignore any things |
| 563 | * which are slightly inconvenient (such as locking conflicts between |
| 564 | * the page lock and the glock) and return having done no I/O. Its |
| 565 | * obviously not something we'd want to do on too regular a basis. |
| 566 | * 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] | 567 | * 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] | 568 | * 3. mpage_readpages() does most of the heavy lifting in the common case. |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 569 | * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 570 | */ |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 571 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 572 | static int gfs2_readpages(struct file *file, struct address_space *mapping, |
| 573 | struct list_head *pages, unsigned nr_pages) |
| 574 | { |
| 575 | struct inode *inode = mapping->host; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 576 | struct gfs2_inode *ip = GFS2_I(inode); |
| 577 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 578 | struct gfs2_holder gh; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 579 | int ret; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 580 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 581 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
| 582 | ret = gfs2_glock_nq(&gh); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 583 | if (unlikely(ret)) |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 584 | goto out_uninit; |
Steven Whitehouse | e1d5b18 | 2006-12-15 16:49:51 -0500 | [diff] [blame] | 585 | if (!gfs2_is_stuffed(ip)) |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 586 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 587 | gfs2_glock_dq(&gh); |
| 588 | out_uninit: |
| 589 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 590 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 591 | ret = -EIO; |
| 592 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 593 | } |
| 594 | |
| 595 | /** |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 596 | * gfs2_write_begin - Begin to write to a file |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 597 | * @file: The file to write to |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 598 | * @mapping: The mapping in which to write |
| 599 | * @pos: The file offset at which to start writing |
| 600 | * @len: Length of the write |
| 601 | * @flags: Various flags |
| 602 | * @pagep: Pointer to return the page |
| 603 | * @fsdata: Pointer to return fs data (unused by GFS2) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 604 | * |
| 605 | * Returns: errno |
| 606 | */ |
| 607 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 608 | static int gfs2_write_begin(struct file *file, struct address_space *mapping, |
| 609 | loff_t pos, unsigned len, unsigned flags, |
| 610 | struct page **pagep, void **fsdata) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 611 | { |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 612 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
| 613 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 614 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
Steven Whitehouse | 7ed122e | 2008-12-10 10:28:10 +0000 | [diff] [blame] | 615 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 616 | int alloc_required; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 617 | int error = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 618 | struct gfs2_alloc *al; |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 619 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
| 620 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); |
| 621 | unsigned to = from + len; |
| 622 | struct page *page; |
Russell Cattelan | 52ae7b7 | 2006-10-09 12:11:54 -0500 | [diff] [blame] | 623 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 624 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); |
| 625 | error = gfs2_glock_nq(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 626 | if (unlikely(error)) |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 627 | goto out_uninit; |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 628 | if (&ip->i_inode == sdp->sd_rindex) { |
| 629 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, |
| 630 | GL_NOCACHE, &m_ip->i_gh); |
| 631 | if (unlikely(error)) { |
| 632 | gfs2_glock_dq(&ip->i_gh); |
| 633 | goto out_uninit; |
| 634 | } |
| 635 | } |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 636 | |
Bob Peterson | 461cb41 | 2010-06-24 19:21:20 -0400 | [diff] [blame] | 637 | alloc_required = gfs2_write_alloc_required(ip, pos, len); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 638 | |
Steven Whitehouse | 7ed122e | 2008-12-10 10:28:10 +0000 | [diff] [blame] | 639 | if (alloc_required || gfs2_is_jdata(ip)) |
| 640 | gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); |
| 641 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 642 | if (alloc_required) { |
| 643 | al = gfs2_alloc_get(ip); |
Cyrill Gorcunov | 182fe5a | 2008-03-03 21:54:21 +0300 | [diff] [blame] | 644 | if (!al) { |
| 645 | error = -ENOMEM; |
| 646 | goto out_unlock; |
| 647 | } |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 648 | |
Steven Whitehouse | d82661d | 2008-03-10 15:34:50 +0000 | [diff] [blame] | 649 | error = gfs2_quota_lock_check(ip); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 650 | if (error) |
| 651 | goto out_alloc_put; |
| 652 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 653 | al->al_requested = data_blocks + ind_blocks; |
| 654 | error = gfs2_inplace_reserve(ip); |
| 655 | if (error) |
| 656 | goto out_qunlock; |
| 657 | } |
| 658 | |
| 659 | rblocks = RES_DINODE + ind_blocks; |
| 660 | if (gfs2_is_jdata(ip)) |
| 661 | rblocks += data_blocks ? data_blocks : 1; |
| 662 | if (ind_blocks || data_blocks) |
| 663 | rblocks += RES_STATFS + RES_QUOTA; |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 664 | if (&ip->i_inode == sdp->sd_rindex) |
| 665 | rblocks += 2 * RES_STATFS; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 666 | |
Steven Whitehouse | 16615be | 2007-09-17 10:59:52 +0100 | [diff] [blame] | 667 | error = gfs2_trans_begin(sdp, rblocks, |
| 668 | PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 669 | if (error) |
Steven Whitehouse | a867bb2 | 2007-07-17 10:29:02 +0100 | [diff] [blame] | 670 | goto out_trans_fail; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 671 | |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 672 | error = -ENOMEM; |
Steven Whitehouse | e4fefba | 2009-01-06 10:08:33 +0000 | [diff] [blame] | 673 | flags |= AOP_FLAG_NOFS; |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 674 | page = grab_cache_page_write_begin(mapping, index, flags); |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 675 | *pagep = page; |
| 676 | if (unlikely(!page)) |
| 677 | goto out_endtrans; |
| 678 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 679 | if (gfs2_is_stuffed(ip)) { |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 680 | error = 0; |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 681 | if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 682 | error = gfs2_unstuff_dinode(ip, page); |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 683 | if (error == 0) |
| 684 | goto prepare_write; |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 685 | } else if (!PageUptodate(page)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 686 | error = stuffed_readpage(ip, page); |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 687 | } |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 688 | goto out; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 689 | } |
| 690 | |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 691 | prepare_write: |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 692 | error = block_prepare_write(page, from, to, gfs2_block_map); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 693 | out: |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 694 | if (error == 0) |
| 695 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 696 | |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 697 | page_cache_release(page); |
npiggin@suse.de | 15c6fd9 | 2010-05-27 01:05:34 +1000 | [diff] [blame] | 698 | |
| 699 | /* |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 700 | * XXX(truncate): the call below should probably be replaced with |
npiggin@suse.de | 15c6fd9 | 2010-05-27 01:05:34 +1000 | [diff] [blame] | 701 | * a call to the gfs2-specific truncate blocks helper to actually |
| 702 | * release disk blocks.. |
| 703 | */ |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 704 | if (pos + len > ip->i_inode.i_size) |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 705 | truncate_setsize(&ip->i_inode, ip->i_inode.i_size); |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 706 | out_endtrans: |
| 707 | gfs2_trans_end(sdp); |
| 708 | out_trans_fail: |
| 709 | if (alloc_required) { |
| 710 | gfs2_inplace_release(ip); |
| 711 | out_qunlock: |
| 712 | gfs2_quota_unlock(ip); |
| 713 | out_alloc_put: |
| 714 | gfs2_alloc_put(ip); |
| 715 | } |
| 716 | out_unlock: |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 717 | if (&ip->i_inode == sdp->sd_rindex) { |
| 718 | gfs2_glock_dq(&m_ip->i_gh); |
| 719 | gfs2_holder_uninit(&m_ip->i_gh); |
| 720 | } |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 721 | gfs2_glock_dq(&ip->i_gh); |
| 722 | out_uninit: |
| 723 | gfs2_holder_uninit(&ip->i_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 724 | return error; |
| 725 | } |
| 726 | |
| 727 | /** |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 728 | * adjust_fs_space - Adjusts the free space available due to gfs2_grow |
| 729 | * @inode: the rindex inode |
| 730 | */ |
| 731 | static void adjust_fs_space(struct inode *inode) |
| 732 | { |
| 733 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 734 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
| 735 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 736 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
| 737 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 738 | struct buffer_head *m_bh, *l_bh; |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 739 | u64 fs_total, new_free; |
| 740 | |
| 741 | /* Total up the file system space, according to the latest rindex. */ |
| 742 | fs_total = gfs2_ri_total(sdp); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 743 | if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) |
| 744 | return; |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 745 | |
| 746 | spin_lock(&sdp->sd_statfs_spin); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 747 | gfs2_statfs_change_in(m_sc, m_bh->b_data + |
| 748 | sizeof(struct gfs2_dinode)); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 749 | if (fs_total > (m_sc->sc_total + l_sc->sc_total)) |
| 750 | new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); |
| 751 | else |
| 752 | new_free = 0; |
| 753 | spin_unlock(&sdp->sd_statfs_spin); |
Robert Peterson | 6c53267 | 2007-05-10 16:54:38 -0500 | [diff] [blame] | 754 | fs_warn(sdp, "File system extended by %llu blocks.\n", |
| 755 | (unsigned long long)new_free); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 756 | gfs2_statfs_change(sdp, new_free, new_free, 0); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 757 | |
| 758 | if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) |
| 759 | goto out; |
| 760 | update_statfs(sdp, m_bh, l_bh); |
| 761 | brelse(l_bh); |
| 762 | out: |
| 763 | brelse(m_bh); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | /** |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 767 | * gfs2_stuffed_write_end - Write end for stuffed files |
| 768 | * @inode: The inode |
| 769 | * @dibh: The buffer_head containing the on-disk inode |
| 770 | * @pos: The file position |
| 771 | * @len: The length of the write |
| 772 | * @copied: How much was actually copied by the VFS |
| 773 | * @page: The page |
| 774 | * |
| 775 | * This copies the data from the page into the inode block after |
| 776 | * the inode data structure itself. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 777 | * |
| 778 | * Returns: errno |
| 779 | */ |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 780 | static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, |
| 781 | loff_t pos, unsigned len, unsigned copied, |
| 782 | struct page *page) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 783 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 784 | struct gfs2_inode *ip = GFS2_I(inode); |
| 785 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 786 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 787 | u64 to = pos + copied; |
| 788 | void *kaddr; |
| 789 | unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); |
| 790 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 791 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 792 | BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); |
| 793 | kaddr = kmap_atomic(page, KM_USER0); |
| 794 | memcpy(buf + pos, kaddr + pos, copied); |
| 795 | memset(kaddr + pos + copied, 0, len - copied); |
| 796 | flush_dcache_page(page); |
| 797 | kunmap_atomic(kaddr, KM_USER0); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 798 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 799 | if (!PageUptodate(page)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 800 | SetPageUptodate(page); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 801 | unlock_page(page); |
| 802 | page_cache_release(page); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 803 | |
Abhijith Das | 7537d81a | 2009-05-12 11:16:20 -0500 | [diff] [blame] | 804 | if (copied) { |
| 805 | if (inode->i_size < to) { |
| 806 | i_size_write(inode, to); |
| 807 | ip->i_disksize = inode->i_size; |
| 808 | } |
| 809 | gfs2_dinode_out(ip, di); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 810 | mark_inode_dirty(inode); |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 811 | } |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 812 | |
Benjamin Marzinski | 9ae3c6d | 2009-11-10 12:54:56 -0600 | [diff] [blame] | 813 | if (inode == sdp->sd_rindex) { |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 814 | adjust_fs_space(inode); |
Benjamin Marzinski | 9ae3c6d | 2009-11-10 12:54:56 -0600 | [diff] [blame] | 815 | ip->i_gh.gh_flags |= GL_NOCACHE; |
| 816 | } |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 817 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 818 | brelse(dibh); |
| 819 | gfs2_trans_end(sdp); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 820 | if (inode == sdp->sd_rindex) { |
| 821 | gfs2_glock_dq(&m_ip->i_gh); |
| 822 | gfs2_holder_uninit(&m_ip->i_gh); |
| 823 | } |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 824 | gfs2_glock_dq(&ip->i_gh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 825 | gfs2_holder_uninit(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 826 | return copied; |
| 827 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 828 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 829 | /** |
| 830 | * gfs2_write_end |
| 831 | * @file: The file to write to |
| 832 | * @mapping: The address space to write to |
| 833 | * @pos: The file position |
| 834 | * @len: The length of the data |
| 835 | * @copied: |
| 836 | * @page: The page that has been written |
| 837 | * @fsdata: The fsdata (unused in GFS2) |
| 838 | * |
| 839 | * The main write_end function for GFS2. We have a separate one for |
| 840 | * stuffed files as they are slightly different, otherwise we just |
| 841 | * put our locking around the VFS provided functions. |
| 842 | * |
| 843 | * Returns: errno |
| 844 | */ |
| 845 | |
| 846 | static int gfs2_write_end(struct file *file, struct address_space *mapping, |
| 847 | loff_t pos, unsigned len, unsigned copied, |
| 848 | struct page *page, void *fsdata) |
| 849 | { |
| 850 | struct inode *inode = page->mapping->host; |
| 851 | struct gfs2_inode *ip = GFS2_I(inode); |
| 852 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 853 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 854 | struct buffer_head *dibh; |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame] | 855 | struct gfs2_alloc *al = ip->i_alloc; |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 856 | unsigned int from = pos & (PAGE_CACHE_SIZE - 1); |
| 857 | unsigned int to = from + len; |
| 858 | int ret; |
| 859 | |
Steven Whitehouse | 7afd88d | 2008-02-22 16:07:18 +0000 | [diff] [blame] | 860 | BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 861 | |
| 862 | ret = gfs2_meta_inode_buffer(ip, &dibh); |
| 863 | if (unlikely(ret)) { |
| 864 | unlock_page(page); |
| 865 | page_cache_release(page); |
| 866 | goto failed; |
| 867 | } |
| 868 | |
| 869 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 870 | |
| 871 | if (gfs2_is_stuffed(ip)) |
| 872 | return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); |
| 873 | |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 874 | if (!gfs2_is_writeback(ip)) |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 875 | gfs2_page_add_databufs(ip, page, from, to); |
| 876 | |
| 877 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
Abhijith Das | 7537d81a | 2009-05-12 11:16:20 -0500 | [diff] [blame] | 878 | if (ret > 0) { |
| 879 | if (inode->i_size > ip->i_disksize) |
| 880 | ip->i_disksize = inode->i_size; |
| 881 | gfs2_dinode_out(ip, dibh->b_data); |
Steven Whitehouse | 9656b2c | 2008-01-08 08:14:30 +0000 | [diff] [blame] | 882 | mark_inode_dirty(inode); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 883 | } |
| 884 | |
Benjamin Marzinski | 9ae3c6d | 2009-11-10 12:54:56 -0600 | [diff] [blame] | 885 | if (inode == sdp->sd_rindex) { |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 886 | adjust_fs_space(inode); |
Benjamin Marzinski | 9ae3c6d | 2009-11-10 12:54:56 -0600 | [diff] [blame] | 887 | ip->i_gh.gh_flags |= GL_NOCACHE; |
| 888 | } |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 889 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 890 | brelse(dibh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 891 | gfs2_trans_end(sdp); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 892 | failed: |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame] | 893 | if (al) { |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 894 | gfs2_inplace_release(ip); |
| 895 | gfs2_quota_unlock(ip); |
| 896 | gfs2_alloc_put(ip); |
| 897 | } |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 898 | if (inode == sdp->sd_rindex) { |
| 899 | gfs2_glock_dq(&m_ip->i_gh); |
| 900 | gfs2_holder_uninit(&m_ip->i_gh); |
| 901 | } |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 902 | gfs2_glock_dq(&ip->i_gh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 903 | gfs2_holder_uninit(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 904 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 905 | } |
| 906 | |
| 907 | /** |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 908 | * gfs2_set_page_dirty - Page dirtying function |
| 909 | * @page: The page to dirty |
| 910 | * |
| 911 | * Returns: 1 if it dirtyed the page, or 0 otherwise |
| 912 | */ |
| 913 | |
| 914 | static int gfs2_set_page_dirty(struct page *page) |
| 915 | { |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 916 | SetPageChecked(page); |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 917 | return __set_page_dirty_buffers(page); |
| 918 | } |
| 919 | |
| 920 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 921 | * gfs2_bmap - Block map function |
| 922 | * @mapping: Address space info |
| 923 | * @lblock: The block to map |
| 924 | * |
| 925 | * Returns: The disk address for the block or 0 on hole or error |
| 926 | */ |
| 927 | |
| 928 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) |
| 929 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 930 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 931 | struct gfs2_holder i_gh; |
| 932 | sector_t dblock = 0; |
| 933 | int error; |
| 934 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 935 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
| 936 | if (error) |
| 937 | return 0; |
| 938 | |
| 939 | if (!gfs2_is_stuffed(ip)) |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 940 | dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 941 | |
| 942 | gfs2_glock_dq_uninit(&i_gh); |
| 943 | |
| 944 | return dblock; |
| 945 | } |
| 946 | |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 947 | static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) |
| 948 | { |
| 949 | struct gfs2_bufdata *bd; |
| 950 | |
| 951 | lock_buffer(bh); |
| 952 | gfs2_log_lock(sdp); |
| 953 | clear_buffer_dirty(bh); |
| 954 | bd = bh->b_private; |
| 955 | if (bd) { |
Steven Whitehouse | 16615be | 2007-09-17 10:59:52 +0100 | [diff] [blame] | 956 | if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh)) |
| 957 | list_del_init(&bd->bd_le.le_list); |
| 958 | else |
| 959 | gfs2_remove_from_journal(bh, current->journal_info, 0); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 960 | } |
| 961 | bh->b_bdev = NULL; |
| 962 | clear_buffer_mapped(bh); |
| 963 | clear_buffer_req(bh); |
| 964 | clear_buffer_new(bh); |
| 965 | gfs2_log_unlock(sdp); |
| 966 | unlock_buffer(bh); |
| 967 | } |
| 968 | |
Steven Whitehouse | 8628de0 | 2006-03-31 16:48:41 -0500 | [diff] [blame] | 969 | static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 970 | { |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 971 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
| 972 | struct buffer_head *bh, *head; |
| 973 | unsigned long pos = 0; |
| 974 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 975 | BUG_ON(!PageLocked(page)); |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 976 | if (offset == 0) |
| 977 | ClearPageChecked(page); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 978 | if (!page_has_buffers(page)) |
| 979 | goto out; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 980 | |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 981 | bh = head = page_buffers(page); |
| 982 | do { |
| 983 | if (offset <= pos) |
| 984 | gfs2_discard(sdp, bh); |
| 985 | pos += bh->b_size; |
| 986 | bh = bh->b_this_page; |
| 987 | } while (bh != head); |
| 988 | out: |
| 989 | if (offset == 0) |
| 990 | try_to_release_page(page, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 991 | } |
| 992 | |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 993 | /** |
| 994 | * gfs2_ok_for_dio - check that dio is valid on this file |
| 995 | * @ip: The inode |
| 996 | * @rw: READ or WRITE |
| 997 | * @offset: The offset at which we are reading or writing |
| 998 | * |
| 999 | * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) |
| 1000 | * 1 (to accept the i/o request) |
| 1001 | */ |
| 1002 | static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) |
| 1003 | { |
| 1004 | /* |
| 1005 | * 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] | 1006 | * a stuffed file makes any sense. For now we'll silently fall |
| 1007 | * back to buffered I/O |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1008 | */ |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1009 | if (gfs2_is_stuffed(ip)) |
| 1010 | return 0; |
| 1011 | |
Bob Peterson | acb57a3 | 2008-09-11 15:35:37 -0400 | [diff] [blame] | 1012 | if (offset >= i_size_read(&ip->i_inode)) |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1013 | return 0; |
| 1014 | return 1; |
| 1015 | } |
| 1016 | |
| 1017 | |
| 1018 | |
Steven Whitehouse | a9e5f4d | 2006-07-25 17:24:12 -0400 | [diff] [blame] | 1019 | static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, |
| 1020 | const struct iovec *iov, loff_t offset, |
| 1021 | unsigned long nr_segs) |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1022 | { |
| 1023 | struct file *file = iocb->ki_filp; |
| 1024 | struct inode *inode = file->f_mapping->host; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1025 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1026 | struct gfs2_holder gh; |
| 1027 | int rv; |
| 1028 | |
| 1029 | /* |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1030 | * Deferred lock, even if its a write, since we do no allocation |
| 1031 | * on this path. All we need change is atime, and this lock mode |
| 1032 | * ensures that other nodes have flushed their buffered read caches |
| 1033 | * (i.e. their page cache entries for this inode). We do not, |
| 1034 | * unfortunately have the option of only flushing a range like |
| 1035 | * the VFS does. |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1036 | */ |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 1037 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); |
| 1038 | rv = gfs2_glock_nq(&gh); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1039 | if (rv) |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1040 | return rv; |
| 1041 | rv = gfs2_ok_for_dio(ip, rw, offset); |
| 1042 | if (rv != 1) |
| 1043 | goto out; /* dio not valid, fall back to buffered i/o */ |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1044 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 1045 | rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
| 1046 | offset, nr_segs, gfs2_get_block_direct, |
| 1047 | NULL, NULL, 0); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1048 | out: |
| 1049 | gfs2_glock_dq_m(1, &gh); |
| 1050 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1051 | return rv; |
| 1052 | } |
| 1053 | |
| 1054 | /** |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1055 | * gfs2_releasepage - free the metadata associated with a page |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1056 | * @page: the page that's being released |
| 1057 | * @gfp_mask: passed from Linux VFS, ignored by us |
| 1058 | * |
| 1059 | * Call try_to_free_buffers() if the buffers in this page can be |
| 1060 | * released. |
| 1061 | * |
| 1062 | * Returns: 0 |
| 1063 | */ |
| 1064 | |
| 1065 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) |
| 1066 | { |
Steven Whitehouse | 009d851 | 2009-12-08 12:12:13 +0000 | [diff] [blame] | 1067 | struct address_space *mapping = page->mapping; |
| 1068 | struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1069 | struct buffer_head *bh, *head; |
| 1070 | struct gfs2_bufdata *bd; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1071 | |
| 1072 | if (!page_has_buffers(page)) |
Steven Whitehouse | 891ba6d | 2007-09-20 15:26:33 +0100 | [diff] [blame] | 1073 | return 0; |
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 | gfs2_log_lock(sdp); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1076 | head = bh = page_buffers(page); |
| 1077 | do { |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1078 | if (atomic_read(&bh->b_count)) |
| 1079 | goto cannot_release; |
| 1080 | bd = bh->b_private; |
| 1081 | if (bd && bd->bd_ail) |
| 1082 | goto cannot_release; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1083 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1084 | gfs2_assert_warn(sdp, !buffer_dirty(bh)); |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1085 | bh = bh->b_this_page; |
| 1086 | } while(bh != head); |
| 1087 | gfs2_log_unlock(sdp); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1088 | |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1089 | head = bh = page_buffers(page); |
| 1090 | do { |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1091 | gfs2_log_lock(sdp); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1092 | bd = bh->b_private; |
| 1093 | if (bd) { |
| 1094 | gfs2_assert_warn(sdp, bd->bd_bh == bh); |
| 1095 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 1096 | if (!list_empty(&bd->bd_le.le_list)) { |
| 1097 | if (!buffer_pinned(bh)) |
| 1098 | list_del_init(&bd->bd_le.le_list); |
| 1099 | else |
| 1100 | bd = NULL; |
| 1101 | } |
| 1102 | if (bd) |
| 1103 | bd->bd_bh = NULL; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1104 | bh->b_private = NULL; |
| 1105 | } |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1106 | gfs2_log_unlock(sdp); |
| 1107 | if (bd) |
| 1108 | kmem_cache_free(gfs2_bufdata_cachep, bd); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1109 | |
| 1110 | bh = bh->b_this_page; |
Steven Whitehouse | 166afcc | 2006-08-24 15:59:40 -0400 | [diff] [blame] | 1111 | } while (bh != head); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1112 | |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1113 | return try_to_free_buffers(page); |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1114 | cannot_release: |
| 1115 | gfs2_log_unlock(sdp); |
| 1116 | return 0; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1117 | } |
| 1118 | |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1119 | static const struct address_space_operations gfs2_writeback_aops = { |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 1120 | .writepage = gfs2_writeback_writepage, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1121 | .writepages = gfs2_writeback_writepages, |
| 1122 | .readpage = gfs2_readpage, |
| 1123 | .readpages = gfs2_readpages, |
| 1124 | .sync_page = block_sync_page, |
| 1125 | .write_begin = gfs2_write_begin, |
| 1126 | .write_end = gfs2_write_end, |
| 1127 | .bmap = gfs2_bmap, |
| 1128 | .invalidatepage = gfs2_invalidatepage, |
| 1129 | .releasepage = gfs2_releasepage, |
| 1130 | .direct_IO = gfs2_direct_IO, |
Steven Whitehouse | e5d9dc2 | 2008-01-03 11:31:38 +0000 | [diff] [blame] | 1131 | .migratepage = buffer_migrate_page, |
Hisashi Hifumi | 229615d | 2009-03-03 11:45:20 +0900 | [diff] [blame] | 1132 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1133 | .error_remove_page = generic_error_remove_page, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1134 | }; |
| 1135 | |
| 1136 | static const struct address_space_operations gfs2_ordered_aops = { |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 1137 | .writepage = gfs2_ordered_writepage, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1138 | .readpage = gfs2_readpage, |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 1139 | .readpages = gfs2_readpages, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1140 | .sync_page = block_sync_page, |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 1141 | .write_begin = gfs2_write_begin, |
| 1142 | .write_end = gfs2_write_end, |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 1143 | .set_page_dirty = gfs2_set_page_dirty, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1144 | .bmap = gfs2_bmap, |
| 1145 | .invalidatepage = gfs2_invalidatepage, |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1146 | .releasepage = gfs2_releasepage, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1147 | .direct_IO = gfs2_direct_IO, |
Steven Whitehouse | e5d9dc2 | 2008-01-03 11:31:38 +0000 | [diff] [blame] | 1148 | .migratepage = buffer_migrate_page, |
Hisashi Hifumi | 229615d | 2009-03-03 11:45:20 +0900 | [diff] [blame] | 1149 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1150 | .error_remove_page = generic_error_remove_page, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1151 | }; |
| 1152 | |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1153 | static const struct address_space_operations gfs2_jdata_aops = { |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 1154 | .writepage = gfs2_jdata_writepage, |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 1155 | .writepages = gfs2_jdata_writepages, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1156 | .readpage = gfs2_readpage, |
| 1157 | .readpages = gfs2_readpages, |
| 1158 | .sync_page = block_sync_page, |
| 1159 | .write_begin = gfs2_write_begin, |
| 1160 | .write_end = gfs2_write_end, |
| 1161 | .set_page_dirty = gfs2_set_page_dirty, |
| 1162 | .bmap = gfs2_bmap, |
| 1163 | .invalidatepage = gfs2_invalidatepage, |
| 1164 | .releasepage = gfs2_releasepage, |
Hisashi Hifumi | 229615d | 2009-03-03 11:45:20 +0900 | [diff] [blame] | 1165 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1166 | .error_remove_page = generic_error_remove_page, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1167 | }; |
| 1168 | |
| 1169 | void gfs2_set_aops(struct inode *inode) |
| 1170 | { |
| 1171 | struct gfs2_inode *ip = GFS2_I(inode); |
| 1172 | |
| 1173 | if (gfs2_is_writeback(ip)) |
| 1174 | inode->i_mapping->a_ops = &gfs2_writeback_aops; |
| 1175 | else if (gfs2_is_ordered(ip)) |
| 1176 | inode->i_mapping->a_ops = &gfs2_ordered_aops; |
| 1177 | else if (gfs2_is_jdata(ip)) |
| 1178 | inode->i_mapping->a_ops = &gfs2_jdata_aops; |
| 1179 | else |
| 1180 | BUG(); |
| 1181 | } |
| 1182 | |