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> |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 23 | #include <linux/uio.h> |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 24 | #include <trace/events/writeback.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" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 33 | #include "quota.h" |
| 34 | #include "trans.h" |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 35 | #include "rgrp.h" |
Robert Peterson | cd81a4b | 2007-05-14 12:42:18 -0500 | [diff] [blame] | 36 | #include "super.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 37 | #include "util.h" |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 38 | #include "glops.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 39 | |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 40 | |
Bob Peterson | b120193 | 2012-04-11 12:58:07 -0400 | [diff] [blame] | 41 | static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, |
| 42 | unsigned int from, unsigned int to) |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 43 | { |
| 44 | struct buffer_head *head = page_buffers(page); |
| 45 | unsigned int bsize = head->b_size; |
| 46 | struct buffer_head *bh; |
| 47 | unsigned int start, end; |
| 48 | |
| 49 | for (bh = head, start = 0; bh != head || !start; |
| 50 | bh = bh->b_this_page, start = end) { |
| 51 | end = start + bsize; |
| 52 | if (end <= from || start >= to) |
| 53 | continue; |
Benjamin Marzinski | ddf4b42 | 2007-06-01 14:21:38 -0500 | [diff] [blame] | 54 | if (gfs2_is_jdata(ip)) |
| 55 | set_buffer_uptodate(bh); |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 56 | gfs2_trans_add_data(ip->i_gl, bh); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 57 | } |
| 58 | } |
| 59 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 60 | /** |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 61 | * 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] | 62 | * @inode: The inode |
| 63 | * @lblock: The block number to look up |
| 64 | * @bh_result: The buffer head to return the result in |
| 65 | * @create: Non-zero if we may add block to the file |
| 66 | * |
| 67 | * Returns: errno |
| 68 | */ |
| 69 | |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 70 | static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, |
| 71 | struct buffer_head *bh_result, int create) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 72 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 73 | int error; |
| 74 | |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 75 | error = gfs2_block_map(inode, lblock, bh_result, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 76 | if (error) |
| 77 | return error; |
Wendy Cheng | de986e8 | 2007-09-18 09:19:13 -0400 | [diff] [blame] | 78 | if (!buffer_mapped(bh_result)) |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 79 | return -EIO; |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 80 | return 0; |
| 81 | } |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 82 | |
| 83 | static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, |
| 84 | struct buffer_head *bh_result, int create) |
| 85 | { |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 86 | return gfs2_block_map(inode, lblock, bh_result, 0); |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 87 | } |
| 88 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 89 | /** |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 90 | * gfs2_writepage_common - Common bits of writepage |
| 91 | * @page: The page to be written |
| 92 | * @wbc: The writeback control |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 93 | * |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 94 | * 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] | 95 | */ |
| 96 | |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 97 | static int gfs2_writepage_common(struct page *page, |
| 98 | struct writeback_control *wbc) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 99 | { |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 100 | struct inode *inode = page->mapping->host; |
Steven Whitehouse | f438714 | 2006-08-08 13:23:19 -0400 | [diff] [blame] | 101 | struct gfs2_inode *ip = GFS2_I(inode); |
| 102 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 103 | loff_t i_size = i_size_read(inode); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 104 | pgoff_t end_index = i_size >> PAGE_SHIFT; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 105 | unsigned offset; |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 106 | |
| 107 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) |
| 108 | goto out; |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 109 | if (current->journal_info) |
| 110 | goto redirty; |
| 111 | /* Is the page fully outside i_size? (truncate in progress) */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 112 | offset = i_size & (PAGE_SIZE-1); |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 113 | if (page->index > end_index || (page->index == end_index && !offset)) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 114 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 115 | goto out; |
| 116 | } |
| 117 | return 1; |
| 118 | redirty: |
| 119 | redirty_page_for_writepage(wbc, page); |
| 120 | out: |
| 121 | unlock_page(page); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | /** |
Steven Whitehouse | 9d35814 | 2013-08-27 21:22:07 +0100 | [diff] [blame] | 126 | * gfs2_writepage - Write page for writeback mappings |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 127 | * @page: The page |
| 128 | * @wbc: The writeback control |
| 129 | * |
| 130 | */ |
| 131 | |
Steven Whitehouse | 9d35814 | 2013-08-27 21:22:07 +0100 | [diff] [blame] | 132 | static int gfs2_writepage(struct page *page, struct writeback_control *wbc) |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 133 | { |
| 134 | int ret; |
| 135 | |
| 136 | ret = gfs2_writepage_common(page, wbc); |
| 137 | if (ret <= 0) |
| 138 | return ret; |
| 139 | |
Steven Whitehouse | 30116ff | 2010-06-14 09:58:41 +0100 | [diff] [blame] | 140 | return nobh_writepage(page, gfs2_get_block_noalloc, wbc); |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 141 | } |
| 142 | |
Benjamin Marzinski | fd4c574 | 2016-06-27 10:01:06 -0500 | [diff] [blame] | 143 | /* This is the same as calling block_write_full_page, but it also |
| 144 | * writes pages outside of i_size |
| 145 | */ |
Andrew Price | c548a1c | 2017-02-03 08:23:47 -0500 | [diff] [blame] | 146 | static int gfs2_write_full_page(struct page *page, get_block_t *get_block, |
| 147 | struct writeback_control *wbc) |
Benjamin Marzinski | fd4c574 | 2016-06-27 10:01:06 -0500 | [diff] [blame] | 148 | { |
| 149 | struct inode * const inode = page->mapping->host; |
| 150 | loff_t i_size = i_size_read(inode); |
| 151 | const pgoff_t end_index = i_size >> PAGE_SHIFT; |
| 152 | unsigned offset; |
| 153 | |
| 154 | /* |
| 155 | * The page straddles i_size. It must be zeroed out on each and every |
| 156 | * writepage invocation because it may be mmapped. "A file is mapped |
| 157 | * in multiples of the page size. For a file that is not a multiple of |
| 158 | * the page size, the remaining memory is zeroed when mapped, and |
| 159 | * writes to that region are not written out to the file." |
| 160 | */ |
| 161 | offset = i_size & (PAGE_SIZE-1); |
| 162 | if (page->index == end_index && offset) |
| 163 | zero_user_segment(page, offset, PAGE_SIZE); |
| 164 | |
| 165 | return __block_write_full_page(inode, page, get_block, wbc, |
| 166 | end_buffer_async_write); |
| 167 | } |
| 168 | |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 169 | /** |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 170 | * __gfs2_jdata_writepage - The core of jdata writepage |
| 171 | * @page: The page to write |
| 172 | * @wbc: The writeback control |
| 173 | * |
| 174 | * This is shared between writepage and writepages and implements the |
| 175 | * core of the writepage operation. If a transaction is required then |
| 176 | * PageChecked will have been set and the transaction will have |
| 177 | * already been started before this is called. |
| 178 | */ |
| 179 | |
| 180 | static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) |
| 181 | { |
| 182 | struct inode *inode = page->mapping->host; |
| 183 | struct gfs2_inode *ip = GFS2_I(inode); |
| 184 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 185 | |
| 186 | if (PageChecked(page)) { |
| 187 | ClearPageChecked(page); |
| 188 | if (!page_has_buffers(page)) { |
| 189 | create_empty_buffers(page, inode->i_sb->s_blocksize, |
Fabian Frederick | 47a9a52 | 2016-08-02 12:05:27 -0500 | [diff] [blame] | 190 | BIT(BH_Dirty)|BIT(BH_Uptodate)); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 191 | } |
| 192 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); |
| 193 | } |
Benjamin Marzinski | fd4c574 | 2016-06-27 10:01:06 -0500 | [diff] [blame] | 194 | return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | /** |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 198 | * gfs2_jdata_writepage - Write complete page |
| 199 | * @page: Page to write |
Fabian Frederick | 1272574 | 2015-05-05 13:29:54 -0500 | [diff] [blame] | 200 | * @wbc: The writeback control |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 201 | * |
| 202 | * Returns: errno |
| 203 | * |
| 204 | */ |
| 205 | |
| 206 | static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) |
| 207 | { |
| 208 | struct inode *inode = page->mapping->host; |
Benjamin Marzinski | fd4c574 | 2016-06-27 10:01:06 -0500 | [diff] [blame] | 209 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 210 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 1bb7322 | 2008-10-15 09:46:39 +0100 | [diff] [blame] | 211 | int ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 212 | |
Benjamin Marzinski | fd4c574 | 2016-06-27 10:01:06 -0500 | [diff] [blame] | 213 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) |
| 214 | goto out; |
| 215 | if (PageChecked(page) || current->journal_info) |
| 216 | goto out_ignore; |
| 217 | ret = __gfs2_jdata_writepage(page, wbc); |
Steven Whitehouse | 1bb7322 | 2008-10-15 09:46:39 +0100 | [diff] [blame] | 218 | return ret; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 219 | |
| 220 | out_ignore: |
| 221 | redirty_page_for_writepage(wbc, page); |
Benjamin Marzinski | fd4c574 | 2016-06-27 10:01:06 -0500 | [diff] [blame] | 222 | out: |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 223 | unlock_page(page); |
| 224 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | /** |
Steven Whitehouse | 4513899 | 2013-01-28 09:30:07 +0000 | [diff] [blame] | 228 | * gfs2_writepages - Write a bunch of dirty pages back to disk |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 229 | * @mapping: The mapping to write |
| 230 | * @wbc: Write-back control |
| 231 | * |
Steven Whitehouse | 4513899 | 2013-01-28 09:30:07 +0000 | [diff] [blame] | 232 | * Used for both ordered and writeback modes. |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 233 | */ |
Steven Whitehouse | 4513899 | 2013-01-28 09:30:07 +0000 | [diff] [blame] | 234 | static int gfs2_writepages(struct address_space *mapping, |
| 235 | struct writeback_control *wbc) |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 236 | { |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 237 | return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); |
Steven Whitehouse | a8d638e | 2007-01-15 13:52:17 +0000 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /** |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 241 | * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages |
| 242 | * @mapping: The mapping |
| 243 | * @wbc: The writeback control |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 244 | * @pvec: The vector of pages |
| 245 | * @nr_pages: The number of pages to write |
Fabian Frederick | 1272574 | 2015-05-05 13:29:54 -0500 | [diff] [blame] | 246 | * @end: End position |
| 247 | * @done_index: Page index |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 248 | * |
| 249 | * Returns: non-zero if loop should terminate, zero otherwise |
| 250 | */ |
| 251 | |
| 252 | static int gfs2_write_jdata_pagevec(struct address_space *mapping, |
| 253 | struct writeback_control *wbc, |
| 254 | struct pagevec *pvec, |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 255 | int nr_pages, pgoff_t end, |
| 256 | pgoff_t *done_index) |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 257 | { |
| 258 | struct inode *inode = mapping->host; |
| 259 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 260 | unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 261 | int i; |
| 262 | int ret; |
| 263 | |
Abhijith Das | 20b95bf | 2008-03-06 17:43:52 -0600 | [diff] [blame] | 264 | ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 265 | if (ret < 0) |
| 266 | return ret; |
| 267 | |
| 268 | for(i = 0; i < nr_pages; i++) { |
| 269 | struct page *page = pvec->pages[i]; |
| 270 | |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 271 | /* |
| 272 | * At this point, the page may be truncated or |
| 273 | * invalidated (changing page->mapping to NULL), or |
| 274 | * even swizzled back from swapper_space to tmpfs file |
| 275 | * mapping. However, page->index will not change |
| 276 | * because we have a reference on the page. |
| 277 | */ |
| 278 | if (page->index > end) { |
| 279 | /* |
| 280 | * can't be range_cyclic (1st pass) because |
| 281 | * end == -1 in that case. |
| 282 | */ |
| 283 | ret = 1; |
| 284 | break; |
| 285 | } |
| 286 | |
| 287 | *done_index = page->index; |
| 288 | |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 289 | lock_page(page); |
| 290 | |
| 291 | if (unlikely(page->mapping != mapping)) { |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 292 | continue_unlock: |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 293 | unlock_page(page); |
| 294 | continue; |
| 295 | } |
| 296 | |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 297 | if (!PageDirty(page)) { |
| 298 | /* someone wrote it for us */ |
| 299 | goto continue_unlock; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 300 | } |
| 301 | |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 302 | if (PageWriteback(page)) { |
| 303 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 304 | wait_on_page_writeback(page); |
| 305 | else |
| 306 | goto continue_unlock; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 307 | } |
| 308 | |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 309 | BUG_ON(PageWriteback(page)); |
| 310 | if (!clear_page_dirty_for_io(page)) |
| 311 | goto continue_unlock; |
| 312 | |
Christoph Hellwig | de1414a | 2015-01-14 10:42:36 +0100 | [diff] [blame] | 313 | trace_wbc_writepage(wbc, inode_to_bdi(inode)); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 314 | |
| 315 | ret = __gfs2_jdata_writepage(page, wbc); |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 316 | if (unlikely(ret)) { |
| 317 | if (ret == AOP_WRITEPAGE_ACTIVATE) { |
| 318 | unlock_page(page); |
| 319 | ret = 0; |
| 320 | } else { |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 321 | |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 322 | /* |
| 323 | * done_index is set past this page, |
| 324 | * so media errors will not choke |
| 325 | * background writeout for the entire |
| 326 | * file. This has consequences for |
| 327 | * range_cyclic semantics (ie. it may |
| 328 | * not be suitable for data integrity |
| 329 | * writeout). |
| 330 | */ |
| 331 | *done_index = page->index + 1; |
| 332 | ret = 1; |
| 333 | break; |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * We stop writing back only if we are not doing |
| 339 | * integrity sync. In case of integrity sync we have to |
| 340 | * keep going until we have written all the pages |
| 341 | * we tagged for writeback prior to entering this loop. |
| 342 | */ |
| 343 | if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 344 | ret = 1; |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 345 | break; |
| 346 | } |
| 347 | |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 348 | } |
| 349 | gfs2_trans_end(sdp); |
| 350 | return ret; |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * gfs2_write_cache_jdata - Like write_cache_pages but different |
| 355 | * @mapping: The mapping to write |
| 356 | * @wbc: The writeback control |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 357 | * |
| 358 | * The reason that we use our own function here is that we need to |
| 359 | * start transactions before we grab page locks. This allows us |
| 360 | * to get the ordering right. |
| 361 | */ |
| 362 | |
| 363 | static int gfs2_write_cache_jdata(struct address_space *mapping, |
| 364 | struct writeback_control *wbc) |
| 365 | { |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 366 | int ret = 0; |
| 367 | int done = 0; |
| 368 | struct pagevec pvec; |
| 369 | int nr_pages; |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 370 | pgoff_t uninitialized_var(writeback_index); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 371 | pgoff_t index; |
| 372 | pgoff_t end; |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 373 | pgoff_t done_index; |
| 374 | int cycled; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 375 | int range_whole = 0; |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 376 | int tag; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 377 | |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 378 | pagevec_init(&pvec, 0); |
| 379 | if (wbc->range_cyclic) { |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 380 | writeback_index = mapping->writeback_index; /* prev offset */ |
| 381 | index = writeback_index; |
| 382 | if (index == 0) |
| 383 | cycled = 1; |
| 384 | else |
| 385 | cycled = 0; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 386 | end = -1; |
| 387 | } else { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 388 | index = wbc->range_start >> PAGE_SHIFT; |
| 389 | end = wbc->range_end >> PAGE_SHIFT; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 390 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 391 | range_whole = 1; |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 392 | cycled = 1; /* ignore range_cyclic tests */ |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 393 | } |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 394 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
| 395 | tag = PAGECACHE_TAG_TOWRITE; |
| 396 | else |
| 397 | tag = PAGECACHE_TAG_DIRTY; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 398 | |
| 399 | retry: |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 400 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
| 401 | tag_pages_for_writeback(mapping, index, end); |
| 402 | done_index = index; |
| 403 | while (!done && (index <= end)) { |
| 404 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
| 405 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); |
| 406 | if (nr_pages == 0) |
| 407 | break; |
| 408 | |
| 409 | ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end, &done_index); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 410 | if (ret) |
| 411 | done = 1; |
| 412 | if (ret > 0) |
| 413 | ret = 0; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 414 | pagevec_release(&pvec); |
| 415 | cond_resched(); |
| 416 | } |
| 417 | |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 418 | if (!cycled && !done) { |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 419 | /* |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 420 | * range_cyclic: |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 421 | * We hit the last page and there is more work to be done: wrap |
| 422 | * back to the start of the file |
| 423 | */ |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 424 | cycled = 1; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 425 | index = 0; |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 426 | end = writeback_index - 1; |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 427 | goto retry; |
| 428 | } |
| 429 | |
| 430 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
Steven Whitehouse | 774016b | 2014-02-06 15:47:47 +0000 | [diff] [blame] | 431 | mapping->writeback_index = done_index; |
| 432 | |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 433 | return ret; |
| 434 | } |
| 435 | |
| 436 | |
| 437 | /** |
| 438 | * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk |
| 439 | * @mapping: The mapping to write |
| 440 | * @wbc: The writeback control |
| 441 | * |
| 442 | */ |
| 443 | |
| 444 | static int gfs2_jdata_writepages(struct address_space *mapping, |
| 445 | struct writeback_control *wbc) |
| 446 | { |
| 447 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
| 448 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); |
| 449 | int ret; |
| 450 | |
| 451 | ret = gfs2_write_cache_jdata(mapping, wbc); |
| 452 | if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { |
Benjamin Marzinski | 2497255 | 2014-05-01 22:26:55 -0500 | [diff] [blame] | 453 | gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH); |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 454 | ret = gfs2_write_cache_jdata(mapping, wbc); |
| 455 | } |
| 456 | return ret; |
| 457 | } |
| 458 | |
| 459 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 460 | * stuffed_readpage - Fill in a Linux page with stuffed file data |
| 461 | * @ip: the inode |
| 462 | * @page: the page |
| 463 | * |
| 464 | * Returns: errno |
| 465 | */ |
| 466 | |
| 467 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) |
| 468 | { |
| 469 | struct buffer_head *dibh; |
Steven Whitehouse | 602c89d | 2010-03-25 14:32:43 +0000 | [diff] [blame] | 470 | u64 dsize = i_size_read(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 471 | void *kaddr; |
| 472 | int error; |
| 473 | |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 474 | /* |
Nick Piggin | 3c18ddd | 2008-04-28 02:12:10 -0700 | [diff] [blame] | 475 | * Due to the order of unstuffing files and ->fault(), we can be |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 476 | * asked for a zero page in the case of a stuffed file being extended, |
| 477 | * so we need to supply one here. It doesn't happen often. |
| 478 | */ |
| 479 | if (unlikely(page->index)) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 480 | zero_user(page, 0, PAGE_SIZE); |
Abhijith Das | 0a7ab79 | 2009-01-07 16:03:37 -0600 | [diff] [blame] | 481 | SetPageUptodate(page); |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 482 | return 0; |
| 483 | } |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 484 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 485 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 486 | if (error) |
| 487 | return error; |
| 488 | |
Cong Wang | d934928 | 2011-11-25 23:14:30 +0800 | [diff] [blame] | 489 | kaddr = kmap_atomic(page); |
Steven Whitehouse | 602c89d | 2010-03-25 14:32:43 +0000 | [diff] [blame] | 490 | if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) |
| 491 | dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); |
| 492 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 493 | memset(kaddr + dsize, 0, PAGE_SIZE - dsize); |
Cong Wang | d934928 | 2011-11-25 23:14:30 +0800 | [diff] [blame] | 494 | kunmap_atomic(kaddr); |
Steven Whitehouse | bf126ae | 2007-04-20 09:18:30 +0100 | [diff] [blame] | 495 | flush_dcache_page(page); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 496 | brelse(dibh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 497 | SetPageUptodate(page); |
| 498 | |
| 499 | return 0; |
| 500 | } |
| 501 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 502 | |
| 503 | /** |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 504 | * __gfs2_readpage - readpage |
| 505 | * @file: The file to read a page for |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 506 | * @page: The page to read |
| 507 | * |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 508 | * This is the core of gfs2's readpage. Its used by the internal file |
| 509 | * reading code as in that case we already hold the glock. Also its |
| 510 | * called by gfs2_readpage() once the required lock has been granted. |
| 511 | * |
| 512 | */ |
| 513 | |
| 514 | static int __gfs2_readpage(void *file, struct page *page) |
| 515 | { |
| 516 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
| 517 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
| 518 | int error; |
| 519 | |
| 520 | if (gfs2_is_stuffed(ip)) { |
| 521 | error = stuffed_readpage(ip, page); |
| 522 | unlock_page(page); |
| 523 | } else { |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 524 | error = mpage_readpage(page, gfs2_block_map); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 525 | } |
| 526 | |
| 527 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 528 | return -EIO; |
| 529 | |
| 530 | return error; |
| 531 | } |
| 532 | |
| 533 | /** |
| 534 | * gfs2_readpage - read a page of a file |
| 535 | * @file: The file to read |
| 536 | * @page: The page of the file |
| 537 | * |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 538 | * This deals with the locking required. We have to unlock and |
| 539 | * relock the page in order to get the locking in the right |
| 540 | * order. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 541 | */ |
| 542 | |
| 543 | static int gfs2_readpage(struct file *file, struct page *page) |
| 544 | { |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 545 | struct address_space *mapping = page->mapping; |
| 546 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 547 | struct gfs2_holder gh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 548 | int error; |
| 549 | |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 550 | unlock_page(page); |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 551 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
| 552 | error = gfs2_glock_nq(&gh); |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 553 | if (unlikely(error)) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 554 | goto out; |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 555 | error = AOP_TRUNCATED_PAGE; |
| 556 | lock_page(page); |
| 557 | if (page->mapping == mapping && !PageUptodate(page)) |
| 558 | error = __gfs2_readpage(file, page); |
| 559 | else |
| 560 | unlock_page(page); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 561 | gfs2_glock_dq(&gh); |
Steven Whitehouse | 7afd88d | 2008-02-22 16:07:18 +0000 | [diff] [blame] | 562 | out: |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 563 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | 01b7c7a | 2008-06-02 09:14:54 +0100 | [diff] [blame] | 564 | if (error && error != AOP_TRUNCATED_PAGE) |
| 565 | lock_page(page); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 566 | return error; |
| 567 | } |
| 568 | |
| 569 | /** |
| 570 | * gfs2_internal_read - read an internal file |
| 571 | * @ip: The gfs2 inode |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 572 | * @buf: The buffer to fill |
| 573 | * @pos: The file position |
| 574 | * @size: The amount to read |
| 575 | * |
| 576 | */ |
| 577 | |
Andrew Price | 4306629 | 2012-04-16 16:40:55 +0100 | [diff] [blame] | 578 | int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, |
| 579 | unsigned size) |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 580 | { |
| 581 | struct address_space *mapping = ip->i_inode.i_mapping; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 582 | unsigned long index = *pos / PAGE_SIZE; |
| 583 | unsigned offset = *pos & (PAGE_SIZE - 1); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 584 | unsigned copied = 0; |
| 585 | unsigned amt; |
| 586 | struct page *page; |
| 587 | void *p; |
| 588 | |
| 589 | do { |
| 590 | amt = size - copied; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 591 | if (offset + size > PAGE_SIZE) |
| 592 | amt = PAGE_SIZE - offset; |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 593 | page = read_cache_page(mapping, index, __gfs2_readpage, NULL); |
| 594 | if (IS_ERR(page)) |
| 595 | return PTR_ERR(page); |
Cong Wang | d934928 | 2011-11-25 23:14:30 +0800 | [diff] [blame] | 596 | p = kmap_atomic(page); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 597 | memcpy(buf + copied, p + offset, amt); |
Cong Wang | d934928 | 2011-11-25 23:14:30 +0800 | [diff] [blame] | 598 | kunmap_atomic(p); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 599 | put_page(page); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 600 | copied += amt; |
| 601 | index++; |
| 602 | offset = 0; |
| 603 | } while(copied < size); |
| 604 | (*pos) += size; |
| 605 | return size; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 606 | } |
| 607 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 608 | /** |
| 609 | * gfs2_readpages - Read a bunch of pages at once |
Fabian Frederick | 1272574 | 2015-05-05 13:29:54 -0500 | [diff] [blame] | 610 | * @file: The file to read from |
| 611 | * @mapping: Address space info |
| 612 | * @pages: List of pages to read |
| 613 | * @nr_pages: Number of pages to read |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 614 | * |
| 615 | * Some notes: |
| 616 | * 1. This is only for readahead, so we can simply ignore any things |
| 617 | * which are slightly inconvenient (such as locking conflicts between |
| 618 | * the page lock and the glock) and return having done no I/O. Its |
| 619 | * obviously not something we'd want to do on too regular a basis. |
| 620 | * 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] | 621 | * 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] | 622 | * 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] | 623 | * 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] | 624 | */ |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 625 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 626 | static int gfs2_readpages(struct file *file, struct address_space *mapping, |
| 627 | struct list_head *pages, unsigned nr_pages) |
| 628 | { |
| 629 | struct inode *inode = mapping->host; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 630 | struct gfs2_inode *ip = GFS2_I(inode); |
| 631 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 632 | struct gfs2_holder gh; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 633 | int ret; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 634 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 635 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
| 636 | ret = gfs2_glock_nq(&gh); |
Steven Whitehouse | 51ff87b | 2007-10-15 14:42:35 +0100 | [diff] [blame] | 637 | if (unlikely(ret)) |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 638 | goto out_uninit; |
Steven Whitehouse | e1d5b18 | 2006-12-15 16:49:51 -0500 | [diff] [blame] | 639 | if (!gfs2_is_stuffed(ip)) |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 640 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 641 | gfs2_glock_dq(&gh); |
| 642 | out_uninit: |
| 643 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 644 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 645 | ret = -EIO; |
| 646 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | /** |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 650 | * gfs2_write_begin - Begin to write to a file |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 651 | * @file: The file to write to |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 652 | * @mapping: The mapping in which to write |
| 653 | * @pos: The file offset at which to start writing |
| 654 | * @len: Length of the write |
| 655 | * @flags: Various flags |
| 656 | * @pagep: Pointer to return the page |
| 657 | * @fsdata: Pointer to return fs data (unused by GFS2) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 658 | * |
| 659 | * Returns: errno |
| 660 | */ |
| 661 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 662 | static int gfs2_write_begin(struct file *file, struct address_space *mapping, |
| 663 | loff_t pos, unsigned len, unsigned flags, |
| 664 | struct page **pagep, void **fsdata) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 665 | { |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 666 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
| 667 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 668 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
Steven Whitehouse | 7ed122e | 2008-12-10 10:28:10 +0000 | [diff] [blame] | 669 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; |
Steven Whitehouse | 71f890f | 2012-07-30 14:53:19 +0100 | [diff] [blame] | 670 | unsigned requested = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 671 | int alloc_required; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 672 | int error = 0; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 673 | pgoff_t index = pos >> PAGE_SHIFT; |
| 674 | unsigned from = pos & (PAGE_SIZE - 1); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 675 | struct page *page; |
Russell Cattelan | 52ae7b7 | 2006-10-09 12:11:54 -0500 | [diff] [blame] | 676 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 677 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); |
| 678 | error = gfs2_glock_nq(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 679 | if (unlikely(error)) |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 680 | goto out_uninit; |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 681 | if (&ip->i_inode == sdp->sd_rindex) { |
| 682 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, |
| 683 | GL_NOCACHE, &m_ip->i_gh); |
| 684 | if (unlikely(error)) { |
| 685 | gfs2_glock_dq(&ip->i_gh); |
| 686 | goto out_uninit; |
| 687 | } |
| 688 | } |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 689 | |
Bob Peterson | 461cb41 | 2010-06-24 19:21:20 -0400 | [diff] [blame] | 690 | alloc_required = gfs2_write_alloc_required(ip, pos, len); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 691 | |
Steven Whitehouse | 7ed122e | 2008-12-10 10:28:10 +0000 | [diff] [blame] | 692 | if (alloc_required || gfs2_is_jdata(ip)) |
| 693 | gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); |
| 694 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 695 | if (alloc_required) { |
Steven Whitehouse | 7b9cff4 | 2013-10-02 11:13:25 +0100 | [diff] [blame] | 696 | struct gfs2_alloc_parms ap = { .aflags = 0, }; |
Abhi Das | b8fbf47 | 2015-03-18 12:03:41 -0500 | [diff] [blame] | 697 | requested = data_blocks + ind_blocks; |
| 698 | ap.target = requested; |
| 699 | error = gfs2_quota_lock_check(ip, &ap); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 700 | if (error) |
Bob Peterson | 5407e24 | 2012-05-18 09:28:23 -0400 | [diff] [blame] | 701 | goto out_unlock; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 702 | |
Steven Whitehouse | 7b9cff4 | 2013-10-02 11:13:25 +0100 | [diff] [blame] | 703 | error = gfs2_inplace_reserve(ip, &ap); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 704 | if (error) |
| 705 | goto out_qunlock; |
| 706 | } |
| 707 | |
| 708 | rblocks = RES_DINODE + ind_blocks; |
| 709 | if (gfs2_is_jdata(ip)) |
| 710 | rblocks += data_blocks ? data_blocks : 1; |
| 711 | if (ind_blocks || data_blocks) |
| 712 | rblocks += RES_STATFS + RES_QUOTA; |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 713 | if (&ip->i_inode == sdp->sd_rindex) |
| 714 | rblocks += 2 * RES_STATFS; |
Benjamin Marzinski | bf97b67 | 2010-09-27 16:00:04 -0500 | [diff] [blame] | 715 | if (alloc_required) |
Steven Whitehouse | 71f890f | 2012-07-30 14:53:19 +0100 | [diff] [blame] | 716 | rblocks += gfs2_rg_blocks(ip, requested); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 717 | |
Steven Whitehouse | 16615be | 2007-09-17 10:59:52 +0100 | [diff] [blame] | 718 | error = gfs2_trans_begin(sdp, rblocks, |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 719 | PAGE_SIZE/sdp->sd_sb.sb_bsize); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 720 | if (error) |
Steven Whitehouse | a867bb2 | 2007-07-17 10:29:02 +0100 | [diff] [blame] | 721 | goto out_trans_fail; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 722 | |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 723 | error = -ENOMEM; |
Steven Whitehouse | e4fefba | 2009-01-06 10:08:33 +0000 | [diff] [blame] | 724 | flags |= AOP_FLAG_NOFS; |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 725 | page = grab_cache_page_write_begin(mapping, index, flags); |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 726 | *pagep = page; |
| 727 | if (unlikely(!page)) |
| 728 | goto out_endtrans; |
| 729 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 730 | if (gfs2_is_stuffed(ip)) { |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 731 | error = 0; |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 732 | if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 733 | error = gfs2_unstuff_dinode(ip, page); |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 734 | if (error == 0) |
| 735 | goto prepare_write; |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 736 | } else if (!PageUptodate(page)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 737 | error = stuffed_readpage(ip, page); |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 738 | } |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 739 | goto out; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 740 | } |
| 741 | |
Steven Whitehouse | 5c4e9e0 | 2006-02-15 12:26:19 +0000 | [diff] [blame] | 742 | prepare_write: |
Christoph Hellwig | ebdec24 | 2010-10-06 10:47:23 +0200 | [diff] [blame] | 743 | error = __block_write_begin(page, from, len, gfs2_block_map); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 744 | out: |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 745 | if (error == 0) |
| 746 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 747 | |
Maxim | 6c474f7 | 2011-03-14 13:19:21 +0000 | [diff] [blame] | 748 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 749 | put_page(page); |
npiggin@suse.de | 15c6fd9 | 2010-05-27 01:05:34 +1000 | [diff] [blame] | 750 | |
Steven Whitehouse | ff8f33c | 2010-08-11 09:37:53 +0100 | [diff] [blame] | 751 | gfs2_trans_end(sdp); |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 752 | if (pos + len > ip->i_inode.i_size) |
Steven Whitehouse | ff8f33c | 2010-08-11 09:37:53 +0100 | [diff] [blame] | 753 | gfs2_trim_blocks(&ip->i_inode); |
| 754 | goto out_trans_fail; |
| 755 | |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 756 | out_endtrans: |
| 757 | gfs2_trans_end(sdp); |
| 758 | out_trans_fail: |
| 759 | if (alloc_required) { |
| 760 | gfs2_inplace_release(ip); |
| 761 | out_qunlock: |
| 762 | gfs2_quota_unlock(ip); |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 763 | } |
| 764 | out_unlock: |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 765 | if (&ip->i_inode == sdp->sd_rindex) { |
| 766 | gfs2_glock_dq(&m_ip->i_gh); |
| 767 | gfs2_holder_uninit(&m_ip->i_gh); |
| 768 | } |
Steven Whitehouse | c41d4f0 | 2007-10-17 14:05:41 +0100 | [diff] [blame] | 769 | gfs2_glock_dq(&ip->i_gh); |
| 770 | out_uninit: |
| 771 | gfs2_holder_uninit(&ip->i_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 772 | return error; |
| 773 | } |
| 774 | |
| 775 | /** |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 776 | * adjust_fs_space - Adjusts the free space available due to gfs2_grow |
| 777 | * @inode: the rindex inode |
| 778 | */ |
| 779 | static void adjust_fs_space(struct inode *inode) |
| 780 | { |
| 781 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 782 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
| 783 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 784 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
| 785 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 786 | struct buffer_head *m_bh, *l_bh; |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 787 | u64 fs_total, new_free; |
| 788 | |
| 789 | /* Total up the file system space, according to the latest rindex. */ |
| 790 | fs_total = gfs2_ri_total(sdp); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 791 | if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) |
| 792 | return; |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 793 | |
| 794 | spin_lock(&sdp->sd_statfs_spin); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 795 | gfs2_statfs_change_in(m_sc, m_bh->b_data + |
| 796 | sizeof(struct gfs2_dinode)); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 797 | if (fs_total > (m_sc->sc_total + l_sc->sc_total)) |
| 798 | new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); |
| 799 | else |
| 800 | new_free = 0; |
| 801 | spin_unlock(&sdp->sd_statfs_spin); |
Robert Peterson | 6c53267 | 2007-05-10 16:54:38 -0500 | [diff] [blame] | 802 | fs_warn(sdp, "File system extended by %llu blocks.\n", |
| 803 | (unsigned long long)new_free); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 804 | gfs2_statfs_change(sdp, new_free, new_free, 0); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 805 | |
| 806 | if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) |
| 807 | goto out; |
| 808 | update_statfs(sdp, m_bh, l_bh); |
| 809 | brelse(l_bh); |
| 810 | out: |
| 811 | brelse(m_bh); |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 812 | } |
| 813 | |
| 814 | /** |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 815 | * gfs2_stuffed_write_end - Write end for stuffed files |
| 816 | * @inode: The inode |
| 817 | * @dibh: The buffer_head containing the on-disk inode |
| 818 | * @pos: The file position |
| 819 | * @len: The length of the write |
| 820 | * @copied: How much was actually copied by the VFS |
| 821 | * @page: The page |
| 822 | * |
| 823 | * This copies the data from the page into the inode block after |
| 824 | * the inode data structure itself. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 825 | * |
| 826 | * Returns: errno |
| 827 | */ |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 828 | static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, |
| 829 | loff_t pos, unsigned len, unsigned copied, |
| 830 | struct page *page) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 831 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 832 | struct gfs2_inode *ip = GFS2_I(inode); |
| 833 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 834 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 835 | u64 to = pos + copied; |
| 836 | void *kaddr; |
| 837 | unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 838 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 839 | BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); |
Cong Wang | d934928 | 2011-11-25 23:14:30 +0800 | [diff] [blame] | 840 | kaddr = kmap_atomic(page); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 841 | memcpy(buf + pos, kaddr + pos, copied); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 842 | flush_dcache_page(page); |
Cong Wang | d934928 | 2011-11-25 23:14:30 +0800 | [diff] [blame] | 843 | kunmap_atomic(kaddr); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 844 | |
Al Viro | 43388b2 | 2016-09-05 22:06:35 -0400 | [diff] [blame] | 845 | WARN_ON(!PageUptodate(page)); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 846 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 847 | put_page(page); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 848 | |
Abhijith Das | 7537d81a | 2009-05-12 11:16:20 -0500 | [diff] [blame] | 849 | if (copied) { |
Steven Whitehouse | a2e0f79 | 2010-08-11 09:53:11 +0100 | [diff] [blame] | 850 | if (inode->i_size < to) |
Abhijith Das | 7537d81a | 2009-05-12 11:16:20 -0500 | [diff] [blame] | 851 | i_size_write(inode, to); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 852 | mark_inode_dirty(inode); |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 853 | } |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 854 | |
Benjamin Marzinski | 9ae3c6d | 2009-11-10 12:54:56 -0600 | [diff] [blame] | 855 | if (inode == sdp->sd_rindex) { |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 856 | adjust_fs_space(inode); |
Bob Peterson | ca9248d | 2012-04-10 08:56:04 -0400 | [diff] [blame] | 857 | sdp->sd_rindex_uptodate = 0; |
Benjamin Marzinski | 9ae3c6d | 2009-11-10 12:54:56 -0600 | [diff] [blame] | 858 | } |
Robert Peterson | 7ae8fa8 | 2007-05-09 09:37:57 -0500 | [diff] [blame] | 859 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 860 | brelse(dibh); |
| 861 | gfs2_trans_end(sdp); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 862 | if (inode == sdp->sd_rindex) { |
| 863 | gfs2_glock_dq(&m_ip->i_gh); |
| 864 | gfs2_holder_uninit(&m_ip->i_gh); |
| 865 | } |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 866 | gfs2_glock_dq(&ip->i_gh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 867 | gfs2_holder_uninit(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 868 | return copied; |
| 869 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 870 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 871 | /** |
| 872 | * gfs2_write_end |
| 873 | * @file: The file to write to |
| 874 | * @mapping: The address space to write to |
| 875 | * @pos: The file position |
| 876 | * @len: The length of the data |
Fabian Frederick | 1272574 | 2015-05-05 13:29:54 -0500 | [diff] [blame] | 877 | * @copied: How much was actually copied by the VFS |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 878 | * @page: The page that has been written |
| 879 | * @fsdata: The fsdata (unused in GFS2) |
| 880 | * |
| 881 | * The main write_end function for GFS2. We have a separate one for |
| 882 | * stuffed files as they are slightly different, otherwise we just |
| 883 | * put our locking around the VFS provided functions. |
| 884 | * |
| 885 | * Returns: errno |
| 886 | */ |
| 887 | |
| 888 | static int gfs2_write_end(struct file *file, struct address_space *mapping, |
| 889 | loff_t pos, unsigned len, unsigned copied, |
| 890 | struct page *page, void *fsdata) |
| 891 | { |
| 892 | struct inode *inode = page->mapping->host; |
| 893 | struct gfs2_inode *ip = GFS2_I(inode); |
| 894 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 895 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 896 | struct buffer_head *dibh; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 897 | unsigned int from = pos & (PAGE_SIZE - 1); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 898 | unsigned int to = from + len; |
| 899 | int ret; |
Benjamin Marzinski | 0c90180 | 2013-09-03 16:59:42 -0500 | [diff] [blame] | 900 | struct gfs2_trans *tr = current->journal_info; |
| 901 | BUG_ON(!tr); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 902 | |
Steven Whitehouse | 7afd88d | 2008-02-22 16:07:18 +0000 | [diff] [blame] | 903 | BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 904 | |
| 905 | ret = gfs2_meta_inode_buffer(ip, &dibh); |
| 906 | if (unlikely(ret)) { |
| 907 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 908 | put_page(page); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 909 | goto failed; |
| 910 | } |
| 911 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 912 | if (gfs2_is_stuffed(ip)) |
| 913 | return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); |
| 914 | |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 915 | if (!gfs2_is_writeback(ip)) |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 916 | gfs2_page_add_databufs(ip, page, from, to); |
| 917 | |
| 918 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
Benjamin Marzinski | 0c90180 | 2013-09-03 16:59:42 -0500 | [diff] [blame] | 919 | if (tr->tr_num_buf_new) |
| 920 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
| 921 | else |
| 922 | gfs2_trans_add_meta(ip->i_gl, dibh); |
| 923 | |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 924 | |
Benjamin Marzinski | 9ae3c6d | 2009-11-10 12:54:56 -0600 | [diff] [blame] | 925 | if (inode == sdp->sd_rindex) { |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 926 | adjust_fs_space(inode); |
Bob Peterson | ca9248d | 2012-04-10 08:56:04 -0400 | [diff] [blame] | 927 | sdp->sd_rindex_uptodate = 0; |
Benjamin Marzinski | 9ae3c6d | 2009-11-10 12:54:56 -0600 | [diff] [blame] | 928 | } |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 929 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 930 | brelse(dibh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 931 | failed: |
Bob Peterson | deab72d | 2011-03-16 16:32:39 -0400 | [diff] [blame] | 932 | gfs2_trans_end(sdp); |
Steven Whitehouse | 71f890f | 2012-07-30 14:53:19 +0100 | [diff] [blame] | 933 | gfs2_inplace_release(ip); |
Bob Peterson | b54e9a0 | 2015-10-26 10:40:28 -0500 | [diff] [blame] | 934 | if (ip->i_qadata && ip->i_qadata->qa_qd_num) |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 935 | gfs2_quota_unlock(ip); |
Benjamin Marzinski | 1946f70 | 2009-06-25 15:09:51 -0500 | [diff] [blame] | 936 | if (inode == sdp->sd_rindex) { |
| 937 | gfs2_glock_dq(&m_ip->i_gh); |
| 938 | gfs2_holder_uninit(&m_ip->i_gh); |
| 939 | } |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 940 | gfs2_glock_dq(&ip->i_gh); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 941 | gfs2_holder_uninit(&ip->i_gh); |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 942 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 943 | } |
| 944 | |
| 945 | /** |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 946 | * gfs2_set_page_dirty - Page dirtying function |
| 947 | * @page: The page to dirty |
| 948 | * |
| 949 | * Returns: 1 if it dirtyed the page, or 0 otherwise |
| 950 | */ |
| 951 | |
| 952 | static int gfs2_set_page_dirty(struct page *page) |
| 953 | { |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 954 | SetPageChecked(page); |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 955 | return __set_page_dirty_buffers(page); |
| 956 | } |
| 957 | |
| 958 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 959 | * gfs2_bmap - Block map function |
| 960 | * @mapping: Address space info |
| 961 | * @lblock: The block to map |
| 962 | * |
| 963 | * Returns: The disk address for the block or 0 on hole or error |
| 964 | */ |
| 965 | |
| 966 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) |
| 967 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 968 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 969 | struct gfs2_holder i_gh; |
| 970 | sector_t dblock = 0; |
| 971 | int error; |
| 972 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 973 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
| 974 | if (error) |
| 975 | return 0; |
| 976 | |
| 977 | if (!gfs2_is_stuffed(ip)) |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 978 | dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 979 | |
| 980 | gfs2_glock_dq_uninit(&i_gh); |
| 981 | |
| 982 | return dblock; |
| 983 | } |
| 984 | |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 985 | static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) |
| 986 | { |
| 987 | struct gfs2_bufdata *bd; |
| 988 | |
| 989 | lock_buffer(bh); |
| 990 | gfs2_log_lock(sdp); |
| 991 | clear_buffer_dirty(bh); |
| 992 | bd = bh->b_private; |
| 993 | if (bd) { |
Bob Peterson | c0752aa | 2012-05-01 12:00:34 -0400 | [diff] [blame] | 994 | if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) |
| 995 | list_del_init(&bd->bd_list); |
Steven Whitehouse | 16615be | 2007-09-17 10:59:52 +0100 | [diff] [blame] | 996 | else |
Bob Peterson | 68cd4ce | 2016-05-02 11:53:35 -0500 | [diff] [blame] | 997 | gfs2_remove_from_journal(bh, REMOVE_JDATA); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 998 | } |
| 999 | bh->b_bdev = NULL; |
| 1000 | clear_buffer_mapped(bh); |
| 1001 | clear_buffer_req(bh); |
| 1002 | clear_buffer_new(bh); |
| 1003 | gfs2_log_unlock(sdp); |
| 1004 | unlock_buffer(bh); |
| 1005 | } |
| 1006 | |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 1007 | static void gfs2_invalidatepage(struct page *page, unsigned int offset, |
| 1008 | unsigned int length) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1009 | { |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 1010 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
Lukas Czerner | 5c0bb97 | 2013-05-21 23:58:49 -0400 | [diff] [blame] | 1011 | unsigned int stop = offset + length; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1012 | int partial_page = (offset || length < PAGE_SIZE); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 1013 | struct buffer_head *bh, *head; |
| 1014 | unsigned long pos = 0; |
| 1015 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1016 | BUG_ON(!PageLocked(page)); |
Lukas Czerner | 5c0bb97 | 2013-05-21 23:58:49 -0400 | [diff] [blame] | 1017 | if (!partial_page) |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 1018 | ClearPageChecked(page); |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 1019 | if (!page_has_buffers(page)) |
| 1020 | goto out; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1021 | |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 1022 | bh = head = page_buffers(page); |
| 1023 | do { |
Lukas Czerner | 5c0bb97 | 2013-05-21 23:58:49 -0400 | [diff] [blame] | 1024 | if (pos + bh->b_size > stop) |
| 1025 | return; |
| 1026 | |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 1027 | if (offset <= pos) |
| 1028 | gfs2_discard(sdp, bh); |
| 1029 | pos += bh->b_size; |
| 1030 | bh = bh->b_this_page; |
| 1031 | } while (bh != head); |
| 1032 | out: |
Lukas Czerner | 5c0bb97 | 2013-05-21 23:58:49 -0400 | [diff] [blame] | 1033 | if (!partial_page) |
Steven Whitehouse | d7b616e | 2007-09-02 10:48:13 +0100 | [diff] [blame] | 1034 | try_to_release_page(page, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1035 | } |
| 1036 | |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1037 | /** |
| 1038 | * gfs2_ok_for_dio - check that dio is valid on this file |
| 1039 | * @ip: The inode |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1040 | * @offset: The offset at which we are reading or writing |
| 1041 | * |
| 1042 | * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) |
| 1043 | * 1 (to accept the i/o request) |
| 1044 | */ |
Omar Sandoval | 6f67376 | 2015-03-16 04:33:52 -0700 | [diff] [blame] | 1045 | static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset) |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1046 | { |
| 1047 | /* |
| 1048 | * 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] | 1049 | * a stuffed file makes any sense. For now we'll silently fall |
| 1050 | * back to buffered I/O |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1051 | */ |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1052 | if (gfs2_is_stuffed(ip)) |
| 1053 | return 0; |
| 1054 | |
Bob Peterson | acb57a3 | 2008-09-11 15:35:37 -0400 | [diff] [blame] | 1055 | if (offset >= i_size_read(&ip->i_inode)) |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1056 | return 0; |
| 1057 | return 1; |
| 1058 | } |
| 1059 | |
| 1060 | |
| 1061 | |
Christoph Hellwig | c8b8e32 | 2016-04-07 08:51:58 -0700 | [diff] [blame] | 1062 | static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1063 | { |
| 1064 | struct file *file = iocb->ki_filp; |
| 1065 | struct inode *inode = file->f_mapping->host; |
Steven Whitehouse | dfd1118 | 2013-12-18 14:14:52 +0000 | [diff] [blame] | 1066 | struct address_space *mapping = inode->i_mapping; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1067 | struct gfs2_inode *ip = GFS2_I(inode); |
Christoph Hellwig | c8b8e32 | 2016-04-07 08:51:58 -0700 | [diff] [blame] | 1068 | loff_t offset = iocb->ki_pos; |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1069 | struct gfs2_holder gh; |
| 1070 | int rv; |
| 1071 | |
| 1072 | /* |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1073 | * Deferred lock, even if its a write, since we do no allocation |
| 1074 | * on this path. All we need change is atime, and this lock mode |
| 1075 | * ensures that other nodes have flushed their buffered read caches |
| 1076 | * (i.e. their page cache entries for this inode). We do not, |
| 1077 | * unfortunately have the option of only flushing a range like |
| 1078 | * the VFS does. |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1079 | */ |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 1080 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); |
| 1081 | rv = gfs2_glock_nq(&gh); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1082 | if (rv) |
Daniel DeFreez | 9c7fe83 | 2016-04-19 19:57:45 -0400 | [diff] [blame] | 1083 | goto out_uninit; |
Omar Sandoval | 6f67376 | 2015-03-16 04:33:52 -0700 | [diff] [blame] | 1084 | rv = gfs2_ok_for_dio(ip, offset); |
Steven Whitehouse | c7b3383 | 2006-12-14 18:24:26 +0000 | [diff] [blame] | 1085 | if (rv != 1) |
| 1086 | goto out; /* dio not valid, fall back to buffered i/o */ |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1087 | |
Steven Whitehouse | dfd1118 | 2013-12-18 14:14:52 +0000 | [diff] [blame] | 1088 | /* |
| 1089 | * Now since we are holding a deferred (CW) lock at this point, you |
| 1090 | * might be wondering why this is ever needed. There is a case however |
| 1091 | * where we've granted a deferred local lock against a cached exclusive |
| 1092 | * glock. That is ok provided all granted local locks are deferred, but |
| 1093 | * it also means that it is possible to encounter pages which are |
| 1094 | * cached and possibly also mapped. So here we check for that and sort |
| 1095 | * them out ahead of the dio. The glock state machine will take care of |
| 1096 | * everything else. |
| 1097 | * |
| 1098 | * If in fact the cached glock state (gl->gl_state) is deferred (CW) in |
| 1099 | * the first place, mapping->nr_pages will always be zero. |
| 1100 | */ |
| 1101 | if (mapping->nrpages) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1102 | loff_t lstart = offset & ~(PAGE_SIZE - 1); |
Al Viro | a6cbcd4 | 2014-03-04 22:38:00 -0500 | [diff] [blame] | 1103 | loff_t len = iov_iter_count(iter); |
Steven Whitehouse | dfd1118 | 2013-12-18 14:14:52 +0000 | [diff] [blame] | 1104 | loff_t end = PAGE_ALIGN(offset + len) - 1; |
| 1105 | |
| 1106 | rv = 0; |
| 1107 | if (len == 0) |
| 1108 | goto out; |
| 1109 | if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) |
| 1110 | unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len); |
| 1111 | rv = filemap_write_and_wait_range(mapping, lstart, end); |
| 1112 | if (rv) |
Steven Whitehouse | 086352f | 2014-01-14 13:46:51 +0000 | [diff] [blame] | 1113 | goto out; |
Omar Sandoval | 6f67376 | 2015-03-16 04:33:52 -0700 | [diff] [blame] | 1114 | if (iov_iter_rw(iter) == WRITE) |
Steven Whitehouse | 086352f | 2014-01-14 13:46:51 +0000 | [diff] [blame] | 1115 | truncate_inode_pages_range(mapping, lstart, end); |
Steven Whitehouse | dfd1118 | 2013-12-18 14:14:52 +0000 | [diff] [blame] | 1116 | } |
| 1117 | |
Omar Sandoval | 17f8c84 | 2015-03-16 04:33:50 -0700 | [diff] [blame] | 1118 | rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
Christoph Hellwig | c8b8e32 | 2016-04-07 08:51:58 -0700 | [diff] [blame] | 1119 | gfs2_get_block_direct, NULL, NULL, 0); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1120 | out: |
Bob Peterson | 8e711e10 | 2012-08-09 12:48:42 -0500 | [diff] [blame] | 1121 | gfs2_glock_dq(&gh); |
Daniel DeFreez | 9c7fe83 | 2016-04-19 19:57:45 -0400 | [diff] [blame] | 1122 | out_uninit: |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1123 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | d1665e4 | 2006-02-14 11:54:42 +0000 | [diff] [blame] | 1124 | return rv; |
| 1125 | } |
| 1126 | |
| 1127 | /** |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1128 | * gfs2_releasepage - free the metadata associated with a page |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1129 | * @page: the page that's being released |
| 1130 | * @gfp_mask: passed from Linux VFS, ignored by us |
| 1131 | * |
| 1132 | * Call try_to_free_buffers() if the buffers in this page can be |
| 1133 | * released. |
| 1134 | * |
| 1135 | * Returns: 0 |
| 1136 | */ |
| 1137 | |
| 1138 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) |
| 1139 | { |
Steven Whitehouse | 009d851 | 2009-12-08 12:12:13 +0000 | [diff] [blame] | 1140 | struct address_space *mapping = page->mapping; |
| 1141 | struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1142 | struct buffer_head *bh, *head; |
| 1143 | struct gfs2_bufdata *bd; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1144 | |
| 1145 | if (!page_has_buffers(page)) |
Steven Whitehouse | 891ba6d | 2007-09-20 15:26:33 +0100 | [diff] [blame] | 1146 | return 0; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1147 | |
Andreas Gruenbacher | 1c185c0 | 2016-08-18 08:57:04 -0500 | [diff] [blame] | 1148 | /* |
| 1149 | * From xfs_vm_releasepage: mm accommodates an old ext3 case where |
| 1150 | * clean pages might not have had the dirty bit cleared. Thus, it can |
| 1151 | * send actual dirty pages to ->releasepage() via shrink_active_list(). |
| 1152 | * |
| 1153 | * As a workaround, we skip pages that contain dirty buffers below. |
| 1154 | * Once ->releasepage isn't called on dirty pages anymore, we can warn |
| 1155 | * on dirty buffers like we used to here again. |
| 1156 | */ |
| 1157 | |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1158 | gfs2_log_lock(sdp); |
Steven Whitehouse | 380f7c6 | 2011-07-14 08:59:44 +0100 | [diff] [blame] | 1159 | spin_lock(&sdp->sd_ail_lock); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1160 | head = bh = page_buffers(page); |
| 1161 | do { |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1162 | if (atomic_read(&bh->b_count)) |
| 1163 | goto cannot_release; |
| 1164 | bd = bh->b_private; |
Benjamin Marzinski | 16ca941 | 2013-04-05 20:31:46 -0500 | [diff] [blame] | 1165 | if (bd && bd->bd_tr) |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1166 | goto cannot_release; |
Andreas Gruenbacher | 1c185c0 | 2016-08-18 08:57:04 -0500 | [diff] [blame] | 1167 | if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) |
| 1168 | goto cannot_release; |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1169 | bh = bh->b_this_page; |
| 1170 | } while(bh != head); |
Steven Whitehouse | 380f7c6 | 2011-07-14 08:59:44 +0100 | [diff] [blame] | 1171 | spin_unlock(&sdp->sd_ail_lock); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1172 | |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1173 | head = bh = page_buffers(page); |
| 1174 | do { |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1175 | bd = bh->b_private; |
| 1176 | if (bd) { |
| 1177 | gfs2_assert_warn(sdp, bd->bd_bh == bh); |
Steven Whitehouse | e4f2920 | 2013-11-26 13:21:08 +0000 | [diff] [blame] | 1178 | if (!list_empty(&bd->bd_list)) |
| 1179 | list_del_init(&bd->bd_list); |
| 1180 | bd->bd_bh = NULL; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1181 | bh->b_private = NULL; |
Steven Whitehouse | 623d935 | 2006-08-31 12:14:44 -0400 | [diff] [blame] | 1182 | kmem_cache_free(gfs2_bufdata_cachep, bd); |
Steven Whitehouse | e4f2920 | 2013-11-26 13:21:08 +0000 | [diff] [blame] | 1183 | } |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1184 | |
| 1185 | bh = bh->b_this_page; |
Steven Whitehouse | 166afcc | 2006-08-24 15:59:40 -0400 | [diff] [blame] | 1186 | } while (bh != head); |
Steven Whitehouse | e4f2920 | 2013-11-26 13:21:08 +0000 | [diff] [blame] | 1187 | gfs2_log_unlock(sdp); |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1188 | |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1189 | return try_to_free_buffers(page); |
Steven Whitehouse | 8f065d3 | 2011-05-03 11:49:19 +0100 | [diff] [blame] | 1190 | |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1191 | cannot_release: |
Steven Whitehouse | 380f7c6 | 2011-07-14 08:59:44 +0100 | [diff] [blame] | 1192 | spin_unlock(&sdp->sd_ail_lock); |
Steven Whitehouse | bb3b0e3 | 2007-08-16 16:03:57 +0100 | [diff] [blame] | 1193 | gfs2_log_unlock(sdp); |
| 1194 | return 0; |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1195 | } |
| 1196 | |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1197 | static const struct address_space_operations gfs2_writeback_aops = { |
Steven Whitehouse | 9d35814 | 2013-08-27 21:22:07 +0100 | [diff] [blame] | 1198 | .writepage = gfs2_writepage, |
Steven Whitehouse | 4513899 | 2013-01-28 09:30:07 +0000 | [diff] [blame] | 1199 | .writepages = gfs2_writepages, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1200 | .readpage = gfs2_readpage, |
| 1201 | .readpages = gfs2_readpages, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1202 | .write_begin = gfs2_write_begin, |
| 1203 | .write_end = gfs2_write_end, |
| 1204 | .bmap = gfs2_bmap, |
| 1205 | .invalidatepage = gfs2_invalidatepage, |
| 1206 | .releasepage = gfs2_releasepage, |
| 1207 | .direct_IO = gfs2_direct_IO, |
Steven Whitehouse | e5d9dc2 | 2008-01-03 11:31:38 +0000 | [diff] [blame] | 1208 | .migratepage = buffer_migrate_page, |
Hisashi Hifumi | 229615d | 2009-03-03 11:45:20 +0900 | [diff] [blame] | 1209 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1210 | .error_remove_page = generic_error_remove_page, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1211 | }; |
| 1212 | |
| 1213 | static const struct address_space_operations gfs2_ordered_aops = { |
Steven Whitehouse | 9d35814 | 2013-08-27 21:22:07 +0100 | [diff] [blame] | 1214 | .writepage = gfs2_writepage, |
Steven Whitehouse | 4513899 | 2013-01-28 09:30:07 +0000 | [diff] [blame] | 1215 | .writepages = gfs2_writepages, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1216 | .readpage = gfs2_readpage, |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 1217 | .readpages = gfs2_readpages, |
Steven Whitehouse | 7765ec2 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 1218 | .write_begin = gfs2_write_begin, |
| 1219 | .write_end = gfs2_write_end, |
Robert Peterson | 8fb6859 | 2007-06-12 11:24:36 -0500 | [diff] [blame] | 1220 | .set_page_dirty = gfs2_set_page_dirty, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1221 | .bmap = gfs2_bmap, |
| 1222 | .invalidatepage = gfs2_invalidatepage, |
Steven Whitehouse | 4340fe6 | 2006-07-11 09:46:33 -0400 | [diff] [blame] | 1223 | .releasepage = gfs2_releasepage, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1224 | .direct_IO = gfs2_direct_IO, |
Steven Whitehouse | e5d9dc2 | 2008-01-03 11:31:38 +0000 | [diff] [blame] | 1225 | .migratepage = buffer_migrate_page, |
Hisashi Hifumi | 229615d | 2009-03-03 11:45:20 +0900 | [diff] [blame] | 1226 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1227 | .error_remove_page = generic_error_remove_page, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1228 | }; |
| 1229 | |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1230 | static const struct address_space_operations gfs2_jdata_aops = { |
Steven Whitehouse | 9ff8ec3 | 2007-09-28 13:49:05 +0100 | [diff] [blame] | 1231 | .writepage = gfs2_jdata_writepage, |
Steven Whitehouse | b8e7cbb | 2007-10-17 09:04:24 +0100 | [diff] [blame] | 1232 | .writepages = gfs2_jdata_writepages, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1233 | .readpage = gfs2_readpage, |
| 1234 | .readpages = gfs2_readpages, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1235 | .write_begin = gfs2_write_begin, |
| 1236 | .write_end = gfs2_write_end, |
| 1237 | .set_page_dirty = gfs2_set_page_dirty, |
| 1238 | .bmap = gfs2_bmap, |
| 1239 | .invalidatepage = gfs2_invalidatepage, |
| 1240 | .releasepage = gfs2_releasepage, |
Hisashi Hifumi | 229615d | 2009-03-03 11:45:20 +0900 | [diff] [blame] | 1241 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1242 | .error_remove_page = generic_error_remove_page, |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 1243 | }; |
| 1244 | |
| 1245 | void gfs2_set_aops(struct inode *inode) |
| 1246 | { |
| 1247 | struct gfs2_inode *ip = GFS2_I(inode); |
| 1248 | |
| 1249 | if (gfs2_is_writeback(ip)) |
| 1250 | inode->i_mapping->a_ops = &gfs2_writeback_aops; |
| 1251 | else if (gfs2_is_ordered(ip)) |
| 1252 | inode->i_mapping->a_ops = &gfs2_ordered_aops; |
| 1253 | else if (gfs2_is_jdata(ip)) |
| 1254 | inode->i_mapping->a_ops = &gfs2_jdata_aops; |
| 1255 | else |
| 1256 | BUG(); |
| 1257 | } |
| 1258 | |