Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include "xfs_log.h" |
| 20 | #include "xfs_sb.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 21 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include "xfs_trans.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "xfs_mount.h" |
| 24 | #include "xfs_bmap_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "xfs_dinode.h" |
| 26 | #include "xfs_inode.h" |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 27 | #include "xfs_inode_item.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 28 | #include "xfs_alloc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "xfs_error.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "xfs_iomap.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 31 | #include "xfs_trace.h" |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 32 | #include "xfs_bmap.h" |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 33 | #include "xfs_bmap_util.h" |
Kent Overstreet | a27bb33 | 2013-05-07 16:19:08 -0700 | [diff] [blame] | 34 | #include <linux/aio.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 35 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/mpage.h> |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 37 | #include <linux/pagevec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/writeback.h> |
| 39 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 40 | void |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 41 | xfs_count_page_state( |
| 42 | struct page *page, |
| 43 | int *delalloc, |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 44 | int *unwritten) |
| 45 | { |
| 46 | struct buffer_head *bh, *head; |
| 47 | |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 48 | *delalloc = *unwritten = 0; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 49 | |
| 50 | bh = head = page_buffers(page); |
| 51 | do { |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 52 | if (buffer_unwritten(bh)) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 53 | (*unwritten) = 1; |
| 54 | else if (buffer_delay(bh)) |
| 55 | (*delalloc) = 1; |
| 56 | } while ((bh = bh->b_this_page) != head); |
| 57 | } |
| 58 | |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 59 | STATIC struct block_device * |
| 60 | xfs_find_bdev_for_inode( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 61 | struct inode *inode) |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 62 | { |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 63 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 64 | struct xfs_mount *mp = ip->i_mount; |
| 65 | |
Eric Sandeen | 71ddabb | 2007-11-23 16:29:42 +1100 | [diff] [blame] | 66 | if (XFS_IS_REALTIME_INODE(ip)) |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 67 | return mp->m_rtdev_targp->bt_bdev; |
| 68 | else |
| 69 | return mp->m_ddev_targp->bt_bdev; |
| 70 | } |
| 71 | |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 72 | /* |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 73 | * We're now finished for good with this ioend structure. |
| 74 | * Update the page state via the associated buffer_heads, |
| 75 | * release holds on the inode and bio, and finally free |
| 76 | * up memory. Do not use the ioend after this. |
| 77 | */ |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 78 | STATIC void |
| 79 | xfs_destroy_ioend( |
| 80 | xfs_ioend_t *ioend) |
| 81 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 82 | struct buffer_head *bh, *next; |
| 83 | |
| 84 | for (bh = ioend->io_buffer_head; bh; bh = next) { |
| 85 | next = bh->b_private; |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 86 | bh->b_end_io(bh, !ioend->io_error); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 87 | } |
Christoph Hellwig | 583fa58 | 2008-12-03 12:20:38 +0100 | [diff] [blame] | 88 | |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 89 | mempool_free(ioend, xfs_ioend_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | /* |
Christoph Hellwig | fc0063c | 2011-08-23 08:28:11 +0000 | [diff] [blame] | 93 | * Fast and loose check if this write could update the on-disk inode size. |
| 94 | */ |
| 95 | static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend) |
| 96 | { |
| 97 | return ioend->io_offset + ioend->io_size > |
| 98 | XFS_I(ioend->io_inode)->i_d.di_size; |
| 99 | } |
| 100 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 101 | STATIC int |
| 102 | xfs_setfilesize_trans_alloc( |
| 103 | struct xfs_ioend *ioend) |
| 104 | { |
| 105 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
| 106 | struct xfs_trans *tp; |
| 107 | int error; |
| 108 | |
| 109 | tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); |
| 110 | |
Jie Liu | 3d3c8b5 | 2013-08-12 20:49:59 +1000 | [diff] [blame] | 111 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 112 | if (error) { |
| 113 | xfs_trans_cancel(tp, 0); |
| 114 | return error; |
| 115 | } |
| 116 | |
| 117 | ioend->io_append_trans = tp; |
| 118 | |
| 119 | /* |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 120 | * We may pass freeze protection with a transaction. So tell lockdep |
Jan Kara | d9457dc | 2012-06-12 16:20:39 +0200 | [diff] [blame] | 121 | * we released it. |
| 122 | */ |
| 123 | rwsem_release(&ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], |
| 124 | 1, _THIS_IP_); |
| 125 | /* |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 126 | * We hand off the transaction to the completion thread now, so |
| 127 | * clear the flag here. |
| 128 | */ |
| 129 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); |
| 130 | return 0; |
| 131 | } |
| 132 | |
Christoph Hellwig | fc0063c | 2011-08-23 08:28:11 +0000 | [diff] [blame] | 133 | /* |
Christoph Hellwig | 2813d68 | 2011-12-18 20:00:12 +0000 | [diff] [blame] | 134 | * Update on-disk file size now that data has been written to disk. |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 135 | */ |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 136 | STATIC int |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 137 | xfs_setfilesize( |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 138 | struct xfs_ioend *ioend) |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 139 | { |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 140 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 141 | struct xfs_trans *tp = ioend->io_append_trans; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 142 | xfs_fsize_t isize; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 143 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 144 | /* |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 145 | * The transaction may have been allocated in the I/O submission thread, |
| 146 | * thus we need to mark ourselves as beeing in a transaction manually. |
| 147 | * Similarly for freeze protection. |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 148 | */ |
| 149 | current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 150 | rwsem_acquire_read(&VFS_I(ip)->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], |
| 151 | 0, 1, _THIS_IP_); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 152 | |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 153 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
Christoph Hellwig | 6923e68 | 2012-02-29 09:53:49 +0000 | [diff] [blame] | 154 | isize = xfs_new_eof(ip, ioend->io_offset + ioend->io_size); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 155 | if (!isize) { |
| 156 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 157 | xfs_trans_cancel(tp, 0); |
| 158 | return 0; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 159 | } |
| 160 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 161 | trace_xfs_setfilesize(ip, ioend->io_offset, ioend->io_size); |
| 162 | |
| 163 | ip->i_d.di_size = isize; |
| 164 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
| 165 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| 166 | |
| 167 | return xfs_trans_commit(tp, 0); |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | /* |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 171 | * Schedule IO completion handling on the final put of an ioend. |
Christoph Hellwig | fc0063c | 2011-08-23 08:28:11 +0000 | [diff] [blame] | 172 | * |
| 173 | * If there is no work to do we might as well call it a day and free the |
| 174 | * ioend right now. |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 175 | */ |
| 176 | STATIC void |
| 177 | xfs_finish_ioend( |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 178 | struct xfs_ioend *ioend) |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 179 | { |
| 180 | if (atomic_dec_and_test(&ioend->io_remaining)) { |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 181 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
| 182 | |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 183 | if (ioend->io_type == XFS_IO_UNWRITTEN) |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 184 | queue_work(mp->m_unwritten_workqueue, &ioend->io_work); |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 185 | else if (ioend->io_append_trans || |
| 186 | (ioend->io_isdirect && xfs_ioend_is_append(ioend))) |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 187 | queue_work(mp->m_data_workqueue, &ioend->io_work); |
Christoph Hellwig | fc0063c | 2011-08-23 08:28:11 +0000 | [diff] [blame] | 188 | else |
| 189 | xfs_destroy_ioend(ioend); |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 190 | } |
| 191 | } |
| 192 | |
| 193 | /* |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 194 | * IO write completion. |
| 195 | */ |
| 196 | STATIC void |
| 197 | xfs_end_io( |
| 198 | struct work_struct *work) |
| 199 | { |
| 200 | xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work); |
| 201 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
Dave Chinner | 6941893 | 2010-03-04 00:57:09 +0000 | [diff] [blame] | 202 | int error = 0; |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 203 | |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 204 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
Christoph Hellwig | 810627d | 2011-11-08 08:56:15 +0000 | [diff] [blame] | 205 | ioend->io_error = -EIO; |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 206 | goto done; |
| 207 | } |
| 208 | if (ioend->io_error) |
| 209 | goto done; |
| 210 | |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 211 | /* |
| 212 | * For unwritten extents we need to issue transactions to convert a |
| 213 | * range to normal written extens after the data I/O has finished. |
| 214 | */ |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 215 | if (ioend->io_type == XFS_IO_UNWRITTEN) { |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 216 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 217 | ioend->io_size); |
| 218 | } else if (ioend->io_isdirect && xfs_ioend_is_append(ioend)) { |
| 219 | /* |
| 220 | * For direct I/O we do not know if we need to allocate blocks |
| 221 | * or not so we can't preallocate an append transaction as that |
| 222 | * results in nested reservations and log space deadlocks. Hence |
| 223 | * allocate the transaction here. While this is sub-optimal and |
| 224 | * can block IO completion for some time, we're stuck with doing |
| 225 | * it this way until we can pass the ioend to the direct IO |
| 226 | * allocation callbacks and avoid nesting that way. |
| 227 | */ |
| 228 | error = xfs_setfilesize_trans_alloc(ioend); |
| 229 | if (error) |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 230 | goto done; |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 231 | error = xfs_setfilesize(ioend); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 232 | } else if (ioend->io_append_trans) { |
| 233 | error = xfs_setfilesize(ioend); |
Christoph Hellwig | 84803fb | 2012-02-29 09:53:50 +0000 | [diff] [blame] | 234 | } else { |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 235 | ASSERT(!xfs_ioend_is_append(ioend)); |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 236 | } |
| 237 | |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 238 | done: |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 239 | if (error) |
| 240 | ioend->io_error = -error; |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 241 | xfs_destroy_ioend(ioend); |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | /* |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 245 | * Call IO completion handling in caller context on the final put of an ioend. |
| 246 | */ |
| 247 | STATIC void |
| 248 | xfs_finish_ioend_sync( |
| 249 | struct xfs_ioend *ioend) |
| 250 | { |
| 251 | if (atomic_dec_and_test(&ioend->io_remaining)) |
| 252 | xfs_end_io(&ioend->io_work); |
| 253 | } |
| 254 | |
| 255 | /* |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 256 | * Allocate and initialise an IO completion structure. |
| 257 | * We need to track unwritten extent write completion here initially. |
| 258 | * We'll need to extend this for updating the ondisk inode size later |
| 259 | * (vs. incore size). |
| 260 | */ |
| 261 | STATIC xfs_ioend_t * |
| 262 | xfs_alloc_ioend( |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 263 | struct inode *inode, |
| 264 | unsigned int type) |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 265 | { |
| 266 | xfs_ioend_t *ioend; |
| 267 | |
| 268 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); |
| 269 | |
| 270 | /* |
| 271 | * Set the count to 1 initially, which will prevent an I/O |
| 272 | * completion callback from happening before we have started |
| 273 | * all the I/O from calling the completion routine too early. |
| 274 | */ |
| 275 | atomic_set(&ioend->io_remaining, 1); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 276 | ioend->io_isdirect = 0; |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 277 | ioend->io_error = 0; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 278 | ioend->io_list = NULL; |
| 279 | ioend->io_type = type; |
Christoph Hellwig | b677c21 | 2007-08-29 11:46:28 +1000 | [diff] [blame] | 280 | ioend->io_inode = inode; |
Christoph Hellwig | c1a073b | 2005-09-05 08:23:35 +1000 | [diff] [blame] | 281 | ioend->io_buffer_head = NULL; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 282 | ioend->io_buffer_tail = NULL; |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 283 | ioend->io_offset = 0; |
| 284 | ioend->io_size = 0; |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 285 | ioend->io_append_trans = NULL; |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 286 | |
Christoph Hellwig | 5ec4fab | 2009-10-30 09:11:47 +0000 | [diff] [blame] | 287 | INIT_WORK(&ioend->io_work, xfs_end_io); |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 288 | return ioend; |
| 289 | } |
| 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | STATIC int |
| 292 | xfs_map_blocks( |
| 293 | struct inode *inode, |
| 294 | loff_t offset, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 295 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 296 | int type, |
| 297 | int nonblocking) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | { |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 299 | struct xfs_inode *ip = XFS_I(inode); |
| 300 | struct xfs_mount *mp = ip->i_mount; |
Christoph Hellwig | ed1e7b7 | 2010-12-10 08:42:22 +0000 | [diff] [blame] | 301 | ssize_t count = 1 << inode->i_blkbits; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 302 | xfs_fileoff_t offset_fsb, end_fsb; |
| 303 | int error = 0; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 304 | int bmapi_flags = XFS_BMAPI_ENTIRE; |
| 305 | int nimaps = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 307 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 308 | return -XFS_ERROR(EIO); |
| 309 | |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 310 | if (type == XFS_IO_UNWRITTEN) |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 311 | bmapi_flags |= XFS_BMAPI_IGSTATE; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 312 | |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 313 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { |
| 314 | if (nonblocking) |
| 315 | return -XFS_ERROR(EAGAIN); |
| 316 | xfs_ilock(ip, XFS_ILOCK_SHARED); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 317 | } |
| 318 | |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 319 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
| 320 | (ip->i_df.if_flags & XFS_IFEXTENTS)); |
Dave Chinner | d2c2819 | 2012-06-08 15:44:53 +1000 | [diff] [blame] | 321 | ASSERT(offset <= mp->m_super->s_maxbytes); |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 322 | |
Dave Chinner | d2c2819 | 2012-06-08 15:44:53 +1000 | [diff] [blame] | 323 | if (offset + count > mp->m_super->s_maxbytes) |
| 324 | count = mp->m_super->s_maxbytes - offset; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 325 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
| 326 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
Dave Chinner | 5c8ed20 | 2011-09-18 20:40:45 +0000 | [diff] [blame] | 327 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
| 328 | imap, &nimaps, bmapi_flags); |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 329 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
| 330 | |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 331 | if (error) |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 332 | return -XFS_ERROR(error); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 333 | |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 334 | if (type == XFS_IO_DELALLOC && |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 335 | (!nimaps || isnullstartblock(imap->br_startblock))) { |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 336 | error = xfs_iomap_write_allocate(ip, offset, count, imap); |
| 337 | if (!error) |
| 338 | trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 339 | return -XFS_ERROR(error); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 340 | } |
| 341 | |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 342 | #ifdef DEBUG |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 343 | if (type == XFS_IO_UNWRITTEN) { |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 344 | ASSERT(nimaps); |
| 345 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
| 346 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); |
| 347 | } |
| 348 | #endif |
| 349 | if (nimaps) |
| 350 | trace_xfs_map_blocks_found(ip, offset, count, type, imap); |
| 351 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
| 353 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 354 | STATIC int |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 355 | xfs_imap_valid( |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 356 | struct inode *inode, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 357 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 358 | xfs_off_t offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | { |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 360 | offset >>= inode->i_blkbits; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 361 | |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 362 | return offset >= imap->br_startoff && |
| 363 | offset < imap->br_startoff + imap->br_blockcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | } |
| 365 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 366 | /* |
| 367 | * BIO completion handler for buffered IO. |
| 368 | */ |
Al Viro | 782e3b3 | 2007-10-12 07:17:47 +0100 | [diff] [blame] | 369 | STATIC void |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 370 | xfs_end_bio( |
| 371 | struct bio *bio, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 372 | int error) |
| 373 | { |
| 374 | xfs_ioend_t *ioend = bio->bi_private; |
| 375 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 376 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 377 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 378 | |
| 379 | /* Toss bio and pass work off to an xfsdatad thread */ |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 380 | bio->bi_private = NULL; |
| 381 | bio->bi_end_io = NULL; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 382 | bio_put(bio); |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 383 | |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 384 | xfs_finish_ioend(ioend); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | STATIC void |
| 388 | xfs_submit_ioend_bio( |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 389 | struct writeback_control *wbc, |
| 390 | xfs_ioend_t *ioend, |
| 391 | struct bio *bio) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 392 | { |
| 393 | atomic_inc(&ioend->io_remaining); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 394 | bio->bi_private = ioend; |
| 395 | bio->bi_end_io = xfs_end_bio; |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 396 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | STATIC struct bio * |
| 400 | xfs_alloc_ioend_bio( |
| 401 | struct buffer_head *bh) |
| 402 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 403 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
Christoph Hellwig | 221cb25 | 2010-12-10 08:42:17 +0000 | [diff] [blame] | 404 | struct bio *bio = bio_alloc(GFP_NOIO, nvecs); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 405 | |
| 406 | ASSERT(bio->bi_private == NULL); |
| 407 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
| 408 | bio->bi_bdev = bh->b_bdev; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 409 | return bio; |
| 410 | } |
| 411 | |
| 412 | STATIC void |
| 413 | xfs_start_buffer_writeback( |
| 414 | struct buffer_head *bh) |
| 415 | { |
| 416 | ASSERT(buffer_mapped(bh)); |
| 417 | ASSERT(buffer_locked(bh)); |
| 418 | ASSERT(!buffer_delay(bh)); |
| 419 | ASSERT(!buffer_unwritten(bh)); |
| 420 | |
| 421 | mark_buffer_async_write(bh); |
| 422 | set_buffer_uptodate(bh); |
| 423 | clear_buffer_dirty(bh); |
| 424 | } |
| 425 | |
| 426 | STATIC void |
| 427 | xfs_start_page_writeback( |
| 428 | struct page *page, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 429 | int clear_dirty, |
| 430 | int buffers) |
| 431 | { |
| 432 | ASSERT(PageLocked(page)); |
| 433 | ASSERT(!PageWriteback(page)); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 434 | if (clear_dirty) |
David Chinner | 9213202 | 2006-12-21 10:24:01 +1100 | [diff] [blame] | 435 | clear_page_dirty_for_io(page); |
| 436 | set_page_writeback(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 437 | unlock_page(page); |
Fengguang Wu | 1f7decf | 2007-10-16 23:30:42 -0700 | [diff] [blame] | 438 | /* If no buffers on the page are to be written, finish it here */ |
| 439 | if (!buffers) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 440 | end_page_writeback(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 441 | } |
| 442 | |
Zhi Yong Wu | c7c1a7d | 2013-08-07 10:11:09 +0000 | [diff] [blame] | 443 | static inline int xfs_bio_add_buffer(struct bio *bio, struct buffer_head *bh) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 444 | { |
| 445 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); |
| 446 | } |
| 447 | |
| 448 | /* |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 449 | * Submit all of the bios for all of the ioends we have saved up, covering the |
| 450 | * initial writepage page and also any probed pages. |
| 451 | * |
| 452 | * Because we may have multiple ioends spanning a page, we need to start |
| 453 | * writeback on all the buffers before we submit them for I/O. If we mark the |
| 454 | * buffers as we got, then we can end up with a page that only has buffers |
| 455 | * marked async write and I/O complete on can occur before we mark the other |
| 456 | * buffers async write. |
| 457 | * |
| 458 | * The end result of this is that we trip a bug in end_page_writeback() because |
| 459 | * we call it twice for the one page as the code in end_buffer_async_write() |
| 460 | * assumes that all buffers on the page are started at the same time. |
| 461 | * |
| 462 | * The fix is two passes across the ioend list - one to start writeback on the |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 463 | * buffer_heads, and then submit them for I/O on the second pass. |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 464 | * |
| 465 | * If @fail is non-zero, it means that we have a situation where some part of |
| 466 | * the submission process has failed after we have marked paged for writeback |
| 467 | * and unlocked them. In this situation, we need to fail the ioend chain rather |
| 468 | * than submit it to IO. This typically only happens on a filesystem shutdown. |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 469 | */ |
| 470 | STATIC void |
| 471 | xfs_submit_ioend( |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 472 | struct writeback_control *wbc, |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 473 | xfs_ioend_t *ioend, |
| 474 | int fail) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 475 | { |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 476 | xfs_ioend_t *head = ioend; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 477 | xfs_ioend_t *next; |
| 478 | struct buffer_head *bh; |
| 479 | struct bio *bio; |
| 480 | sector_t lastblock = 0; |
| 481 | |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 482 | /* Pass 1 - start writeback */ |
| 483 | do { |
| 484 | next = ioend->io_list; |
Christoph Hellwig | 221cb25 | 2010-12-10 08:42:17 +0000 | [diff] [blame] | 485 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 486 | xfs_start_buffer_writeback(bh); |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 487 | } while ((ioend = next) != NULL); |
| 488 | |
| 489 | /* Pass 2 - submit I/O */ |
| 490 | ioend = head; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 491 | do { |
| 492 | next = ioend->io_list; |
| 493 | bio = NULL; |
| 494 | |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 495 | /* |
| 496 | * If we are failing the IO now, just mark the ioend with an |
| 497 | * error and finish it. This will run IO completion immediately |
| 498 | * as there is only one reference to the ioend at this point in |
| 499 | * time. |
| 500 | */ |
| 501 | if (fail) { |
| 502 | ioend->io_error = -fail; |
| 503 | xfs_finish_ioend(ioend); |
| 504 | continue; |
| 505 | } |
| 506 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 507 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 508 | |
| 509 | if (!bio) { |
| 510 | retry: |
| 511 | bio = xfs_alloc_ioend_bio(bh); |
| 512 | } else if (bh->b_blocknr != lastblock + 1) { |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 513 | xfs_submit_ioend_bio(wbc, ioend, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 514 | goto retry; |
| 515 | } |
| 516 | |
Zhi Yong Wu | c7c1a7d | 2013-08-07 10:11:09 +0000 | [diff] [blame] | 517 | if (xfs_bio_add_buffer(bio, bh) != bh->b_size) { |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 518 | xfs_submit_ioend_bio(wbc, ioend, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 519 | goto retry; |
| 520 | } |
| 521 | |
| 522 | lastblock = bh->b_blocknr; |
| 523 | } |
| 524 | if (bio) |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 525 | xfs_submit_ioend_bio(wbc, ioend, bio); |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 526 | xfs_finish_ioend(ioend); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 527 | } while ((ioend = next) != NULL); |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * Cancel submission of all buffer_heads so far in this endio. |
| 532 | * Toss the endio too. Only ever called for the initial page |
| 533 | * in a writepage request, so only ever one page. |
| 534 | */ |
| 535 | STATIC void |
| 536 | xfs_cancel_ioend( |
| 537 | xfs_ioend_t *ioend) |
| 538 | { |
| 539 | xfs_ioend_t *next; |
| 540 | struct buffer_head *bh, *next_bh; |
| 541 | |
| 542 | do { |
| 543 | next = ioend->io_list; |
| 544 | bh = ioend->io_buffer_head; |
| 545 | do { |
| 546 | next_bh = bh->b_private; |
| 547 | clear_buffer_async_write(bh); |
| 548 | unlock_buffer(bh); |
| 549 | } while ((bh = next_bh) != NULL); |
| 550 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 551 | mempool_free(ioend, xfs_ioend_pool); |
| 552 | } while ((ioend = next) != NULL); |
| 553 | } |
| 554 | |
| 555 | /* |
| 556 | * Test to see if we've been building up a completion structure for |
| 557 | * earlier buffers -- if so, we try to append to this ioend if we |
| 558 | * can, otherwise we finish off any current ioend and start another. |
| 559 | * Return true if we've finished the given ioend. |
| 560 | */ |
| 561 | STATIC void |
| 562 | xfs_add_to_ioend( |
| 563 | struct inode *inode, |
| 564 | struct buffer_head *bh, |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 565 | xfs_off_t offset, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 566 | unsigned int type, |
| 567 | xfs_ioend_t **result, |
| 568 | int need_ioend) |
| 569 | { |
| 570 | xfs_ioend_t *ioend = *result; |
| 571 | |
| 572 | if (!ioend || need_ioend || type != ioend->io_type) { |
| 573 | xfs_ioend_t *previous = *result; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 574 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 575 | ioend = xfs_alloc_ioend(inode, type); |
| 576 | ioend->io_offset = offset; |
| 577 | ioend->io_buffer_head = bh; |
| 578 | ioend->io_buffer_tail = bh; |
| 579 | if (previous) |
| 580 | previous->io_list = ioend; |
| 581 | *result = ioend; |
| 582 | } else { |
| 583 | ioend->io_buffer_tail->b_private = bh; |
| 584 | ioend->io_buffer_tail = bh; |
| 585 | } |
| 586 | |
| 587 | bh->b_private = NULL; |
| 588 | ioend->io_size += bh->b_size; |
| 589 | } |
| 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | STATIC void |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 592 | xfs_map_buffer( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 593 | struct inode *inode, |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 594 | struct buffer_head *bh, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 595 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 596 | xfs_off_t offset) |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 597 | { |
| 598 | sector_t bn; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 599 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 600 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff); |
| 601 | xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), imap->br_startblock); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 602 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 603 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
| 604 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 605 | |
Christoph Hellwig | e513182 | 2010-04-28 12:28:55 +0000 | [diff] [blame] | 606 | bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) + |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 607 | ((offset - iomap_offset) >> inode->i_blkbits); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 608 | |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 609 | ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode))); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 610 | |
| 611 | bh->b_blocknr = bn; |
| 612 | set_buffer_mapped(bh); |
| 613 | } |
| 614 | |
| 615 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | xfs_map_at_offset( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 617 | struct inode *inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | struct buffer_head *bh, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 619 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 620 | xfs_off_t offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | { |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 622 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
| 623 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 625 | xfs_map_buffer(inode, bh, imap, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | set_buffer_mapped(bh); |
| 627 | clear_buffer_delay(bh); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 628 | clear_buffer_unwritten(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
| 630 | |
| 631 | /* |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 632 | * Test if a given page is suitable for writing as part of an unwritten |
| 633 | * or delayed allocate extent. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | */ |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 635 | STATIC int |
Dave Chinner | 6ffc4db | 2012-04-23 15:58:43 +1000 | [diff] [blame] | 636 | xfs_check_page_type( |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 637 | struct page *page, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 638 | unsigned int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | if (PageWriteback(page)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 641 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
| 643 | if (page->mapping && page_has_buffers(page)) { |
| 644 | struct buffer_head *bh, *head; |
| 645 | int acceptable = 0; |
| 646 | |
| 647 | bh = head = page_buffers(page); |
| 648 | do { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 649 | if (buffer_unwritten(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 650 | acceptable += (type == XFS_IO_UNWRITTEN); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 651 | else if (buffer_delay(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 652 | acceptable += (type == XFS_IO_DELALLOC); |
David Chinner | 2ddee84 | 2006-03-22 12:47:40 +1100 | [diff] [blame] | 653 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 654 | acceptable += (type == XFS_IO_OVERWRITE); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 655 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } while ((bh = bh->b_this_page) != head); |
| 658 | |
| 659 | if (acceptable) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 660 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
| 662 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 663 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
| 665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | /* |
| 667 | * Allocate & map buffers for page given the extent map. Write it out. |
| 668 | * except for the original page of a writepage, this is called on |
| 669 | * delalloc/unwritten pages only, for the original page it is possible |
| 670 | * that the page has no mapping at all. |
| 671 | */ |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 672 | STATIC int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | xfs_convert_page( |
| 674 | struct inode *inode, |
| 675 | struct page *page, |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 676 | loff_t tindex, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 677 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 678 | xfs_ioend_t **ioendp, |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 679 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 681 | struct buffer_head *bh, *head; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 682 | xfs_off_t end_offset; |
| 683 | unsigned long p_offset; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 684 | unsigned int type; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 685 | int len, page_dirty; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 686 | int count = 0, done = 0, uptodate = 1; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 687 | xfs_off_t offset = page_offset(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 689 | if (page->index != tindex) |
| 690 | goto fail; |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 691 | if (!trylock_page(page)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 692 | goto fail; |
| 693 | if (PageWriteback(page)) |
| 694 | goto fail_unlock_page; |
| 695 | if (page->mapping != inode->i_mapping) |
| 696 | goto fail_unlock_page; |
Dave Chinner | 6ffc4db | 2012-04-23 15:58:43 +1000 | [diff] [blame] | 697 | if (!xfs_check_page_type(page, (*ioendp)->io_type)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 698 | goto fail_unlock_page; |
| 699 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 700 | /* |
| 701 | * page_dirty is initially a count of buffers on the page before |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 702 | * EOF and is decremented as we move each into a cleanable state. |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 703 | * |
| 704 | * Derivation: |
| 705 | * |
| 706 | * End offset is the highest offset that this page should represent. |
| 707 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) |
| 708 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and |
| 709 | * hence give us the correct page_dirty count. On any other page, |
| 710 | * it will be zero and in that case we need page_dirty to be the |
| 711 | * count of buffers on the page. |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 712 | */ |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 713 | end_offset = min_t(unsigned long long, |
| 714 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
| 715 | i_size_read(inode)); |
| 716 | |
Dave Chinner | 480d746 | 2013-05-20 09:51:08 +1000 | [diff] [blame] | 717 | /* |
| 718 | * If the current map does not span the entire page we are about to try |
| 719 | * to write, then give up. The only way we can write a page that spans |
| 720 | * multiple mappings in a single writeback iteration is via the |
| 721 | * xfs_vm_writepage() function. Data integrity writeback requires the |
| 722 | * entire page to be written in a single attempt, otherwise the part of |
| 723 | * the page we don't write here doesn't get written as part of the data |
| 724 | * integrity sync. |
| 725 | * |
| 726 | * For normal writeback, we also don't attempt to write partial pages |
| 727 | * here as it simply means that write_cache_pages() will see it under |
| 728 | * writeback and ignore the page until some point in the future, at |
| 729 | * which time this will be the only page in the file that needs |
| 730 | * writeback. Hence for more optimal IO patterns, we should always |
| 731 | * avoid partial page writeback due to multiple mappings on a page here. |
| 732 | */ |
| 733 | if (!xfs_imap_valid(inode, imap, end_offset)) |
| 734 | goto fail_unlock_page; |
| 735 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 736 | len = 1 << inode->i_blkbits; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 737 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
| 738 | PAGE_CACHE_SIZE); |
| 739 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; |
| 740 | page_dirty = p_offset / len; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | bh = head = page_buffers(page); |
| 743 | do { |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 744 | if (offset >= end_offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | break; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 746 | if (!buffer_uptodate(bh)) |
| 747 | uptodate = 0; |
| 748 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { |
| 749 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | continue; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 751 | } |
| 752 | |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 753 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
| 754 | buffer_mapped(bh)) { |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 755 | if (buffer_unwritten(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 756 | type = XFS_IO_UNWRITTEN; |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 757 | else if (buffer_delay(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 758 | type = XFS_IO_DELALLOC; |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 759 | else |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 760 | type = XFS_IO_OVERWRITE; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 761 | |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 762 | if (!xfs_imap_valid(inode, imap, offset)) { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 763 | done = 1; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 764 | continue; |
| 765 | } |
| 766 | |
Christoph Hellwig | ecff71e | 2010-12-10 08:42:25 +0000 | [diff] [blame] | 767 | lock_buffer(bh); |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 768 | if (type != XFS_IO_OVERWRITE) |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 769 | xfs_map_at_offset(inode, bh, imap, offset); |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 770 | xfs_add_to_ioend(inode, bh, offset, type, |
| 771 | ioendp, done); |
| 772 | |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 773 | page_dirty--; |
| 774 | count++; |
| 775 | } else { |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 776 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | } |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 778 | } while (offset += len, (bh = bh->b_this_page) != head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 780 | if (uptodate && bh == head) |
| 781 | SetPageUptodate(page); |
| 782 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 783 | if (count) { |
Dave Chinner | efceab1 | 2010-08-24 11:44:56 +1000 | [diff] [blame] | 784 | if (--wbc->nr_to_write <= 0 && |
| 785 | wbc->sync_mode == WB_SYNC_NONE) |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 786 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 788 | xfs_start_page_writeback(page, !page_dirty, count); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 789 | |
| 790 | return done; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 791 | fail_unlock_page: |
| 792 | unlock_page(page); |
| 793 | fail: |
| 794 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | /* |
| 798 | * Convert & write out a cluster of pages in the same extent as defined |
| 799 | * by mp and following the start page. |
| 800 | */ |
| 801 | STATIC void |
| 802 | xfs_cluster_write( |
| 803 | struct inode *inode, |
| 804 | pgoff_t tindex, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 805 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 806 | xfs_ioend_t **ioendp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | struct writeback_control *wbc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | pgoff_t tlast) |
| 809 | { |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 810 | struct pagevec pvec; |
| 811 | int done = 0, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 813 | pagevec_init(&pvec, 0); |
| 814 | while (!done && tindex <= tlast) { |
| 815 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); |
| 816 | |
| 817 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | break; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 819 | |
| 820 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 821 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 822 | imap, ioendp, wbc); |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 823 | if (done) |
| 824 | break; |
| 825 | } |
| 826 | |
| 827 | pagevec_release(&pvec); |
| 828 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
| 830 | } |
| 831 | |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 832 | STATIC void |
| 833 | xfs_vm_invalidatepage( |
| 834 | struct page *page, |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 835 | unsigned int offset, |
| 836 | unsigned int length) |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 837 | { |
Lukas Czerner | 34097df | 2013-05-21 23:58:01 -0400 | [diff] [blame] | 838 | trace_xfs_invalidatepage(page->mapping->host, page, offset, |
| 839 | length); |
| 840 | block_invalidatepage(page, offset, length); |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 841 | } |
| 842 | |
| 843 | /* |
| 844 | * If the page has delalloc buffers on it, we need to punch them out before we |
| 845 | * invalidate the page. If we don't, we leave a stale delalloc mapping on the |
| 846 | * inode that can trip a BUG() in xfs_get_blocks() later on if a direct IO read |
| 847 | * is done on that same region - the delalloc extent is returned when none is |
| 848 | * supposed to be there. |
| 849 | * |
| 850 | * We prevent this by truncating away the delalloc regions on the page before |
| 851 | * invalidating it. Because they are delalloc, we can do this without needing a |
| 852 | * transaction. Indeed - if we get ENOSPC errors, we have to be able to do this |
| 853 | * truncation without a transaction as there is no space left for block |
| 854 | * reservation (typically why we see a ENOSPC in writeback). |
| 855 | * |
| 856 | * This is not a performance critical path, so for now just do the punching a |
| 857 | * buffer head at a time. |
| 858 | */ |
| 859 | STATIC void |
| 860 | xfs_aops_discard_page( |
| 861 | struct page *page) |
| 862 | { |
| 863 | struct inode *inode = page->mapping->host; |
| 864 | struct xfs_inode *ip = XFS_I(inode); |
| 865 | struct buffer_head *bh, *head; |
| 866 | loff_t offset = page_offset(page); |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 867 | |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 868 | if (!xfs_check_page_type(page, XFS_IO_DELALLOC)) |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 869 | goto out_invalidate; |
| 870 | |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 871 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 872 | goto out_invalidate; |
| 873 | |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 874 | xfs_alert(ip->i_mount, |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 875 | "page discard on page %p, inode 0x%llx, offset %llu.", |
| 876 | page, ip->i_ino, offset); |
| 877 | |
| 878 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 879 | bh = head = page_buffers(page); |
| 880 | do { |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 881 | int error; |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 882 | xfs_fileoff_t start_fsb; |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 883 | |
| 884 | if (!buffer_delay(bh)) |
| 885 | goto next_buffer; |
| 886 | |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 887 | start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); |
| 888 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1); |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 889 | if (error) { |
| 890 | /* something screwed, just bail */ |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 891 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 892 | xfs_alert(ip->i_mount, |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 893 | "page discard unable to remove delalloc mapping."); |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 894 | } |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 895 | break; |
| 896 | } |
| 897 | next_buffer: |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 898 | offset += 1 << inode->i_blkbits; |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 899 | |
| 900 | } while ((bh = bh->b_this_page) != head); |
| 901 | |
| 902 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 903 | out_invalidate: |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 904 | xfs_vm_invalidatepage(page, 0, PAGE_CACHE_SIZE); |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 905 | return; |
| 906 | } |
| 907 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | /* |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 909 | * Write out a dirty page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | * |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 911 | * For delalloc space on the page we need to allocate space and flush it. |
| 912 | * For unwritten space on the page we need to start the conversion to |
| 913 | * regular allocated space. |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 914 | * For any other dirty buffer heads on the page we should flush them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | STATIC int |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 917 | xfs_vm_writepage( |
| 918 | struct page *page, |
| 919 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | { |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 921 | struct inode *inode = page->mapping->host; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 922 | struct buffer_head *bh, *head; |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 923 | struct xfs_bmbt_irec imap; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 924 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | loff_t offset; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 926 | unsigned int type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | __uint64_t end_offset; |
Christoph Hellwig | bd1556a | 2010-04-28 12:29:00 +0000 | [diff] [blame] | 928 | pgoff_t end_index, last_index; |
Christoph Hellwig | ed1e7b7 | 2010-12-10 08:42:22 +0000 | [diff] [blame] | 929 | ssize_t len; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 930 | int err, imap_valid = 0, uptodate = 1; |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 931 | int count = 0; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 932 | int nonblocking = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
Lukas Czerner | 34097df | 2013-05-21 23:58:01 -0400 | [diff] [blame] | 934 | trace_xfs_writepage(inode, page, 0, 0); |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 935 | |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 936 | ASSERT(page_has_buffers(page)); |
| 937 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 938 | /* |
| 939 | * Refuse to write the page out if we are called from reclaim context. |
| 940 | * |
Christoph Hellwig | d4f7a5c | 2010-06-28 10:34:44 -0400 | [diff] [blame] | 941 | * This avoids stack overflows when called from deeply used stacks in |
| 942 | * random callers for direct reclaim or memcg reclaim. We explicitly |
| 943 | * allow reclaim from kswapd as the stack usage there is relatively low. |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 944 | * |
Mel Gorman | 94054fa | 2011-10-31 17:07:45 -0700 | [diff] [blame] | 945 | * This should never happen except in the case of a VM regression so |
| 946 | * warn about it. |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 947 | */ |
Mel Gorman | 94054fa | 2011-10-31 17:07:45 -0700 | [diff] [blame] | 948 | if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == |
| 949 | PF_MEMALLOC)) |
Christoph Hellwig | b5420f2 | 2010-08-24 11:47:51 +1000 | [diff] [blame] | 950 | goto redirty; |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 951 | |
| 952 | /* |
Christoph Hellwig | 680a647 | 2011-07-08 14:34:05 +0200 | [diff] [blame] | 953 | * Given that we do not allow direct reclaim to call us, we should |
| 954 | * never be called while in a filesystem transaction. |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 955 | */ |
Christoph Hellwig | 680a647 | 2011-07-08 14:34:05 +0200 | [diff] [blame] | 956 | if (WARN_ON(current->flags & PF_FSTRANS)) |
Christoph Hellwig | b5420f2 | 2010-08-24 11:47:51 +1000 | [diff] [blame] | 957 | goto redirty; |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | /* Is this page beyond the end of the file? */ |
| 960 | offset = i_size_read(inode); |
| 961 | end_index = offset >> PAGE_CACHE_SHIFT; |
| 962 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; |
| 963 | if (page->index >= end_index) { |
Christoph Hellwig | 6b7a03f | 2012-07-03 12:20:00 -0400 | [diff] [blame] | 964 | unsigned offset_into_page = offset & (PAGE_CACHE_SIZE - 1); |
| 965 | |
| 966 | /* |
Jan Kara | ff9a28f | 2013-03-14 14:30:54 +0100 | [diff] [blame] | 967 | * Skip the page if it is fully outside i_size, e.g. due to a |
| 968 | * truncate operation that is in progress. We must redirty the |
| 969 | * page so that reclaim stops reclaiming it. Otherwise |
| 970 | * xfs_vm_releasepage() is called on it and gets confused. |
Christoph Hellwig | 6b7a03f | 2012-07-03 12:20:00 -0400 | [diff] [blame] | 971 | */ |
Jan Kara | ff9a28f | 2013-03-14 14:30:54 +0100 | [diff] [blame] | 972 | if (page->index >= end_index + 1 || offset_into_page == 0) |
| 973 | goto redirty; |
Christoph Hellwig | 6b7a03f | 2012-07-03 12:20:00 -0400 | [diff] [blame] | 974 | |
| 975 | /* |
| 976 | * The page straddles i_size. It must be zeroed out on each |
| 977 | * and every writepage invocation because it may be mmapped. |
| 978 | * "A file is mapped in multiples of the page size. For a file |
| 979 | * that is not a multiple of the page size, the remaining |
| 980 | * memory is zeroed when mapped, and writes to that region are |
| 981 | * not written out to the file." |
| 982 | */ |
| 983 | zero_user_segment(page, offset_into_page, PAGE_CACHE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | } |
| 985 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 986 | end_offset = min_t(unsigned long long, |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 987 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
| 988 | offset); |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 989 | len = 1 << inode->i_blkbits; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 990 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 991 | bh = head = page_buffers(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 992 | offset = page_offset(page); |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 993 | type = XFS_IO_OVERWRITE; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 994 | |
Christoph Hellwig | dbcdde3 | 2011-07-08 14:34:14 +0200 | [diff] [blame] | 995 | if (wbc->sync_mode == WB_SYNC_NONE) |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 996 | nonblocking = 1; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 997 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | do { |
Christoph Hellwig | 6ac7248 | 2010-12-10 08:42:18 +0000 | [diff] [blame] | 999 | int new_ioend = 0; |
| 1000 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | if (offset >= end_offset) |
| 1002 | break; |
| 1003 | if (!buffer_uptodate(bh)) |
| 1004 | uptodate = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
Eric Sandeen | 3d9b02e | 2010-06-24 09:45:30 +1000 | [diff] [blame] | 1006 | /* |
Christoph Hellwig | ece413f | 2010-11-10 21:39:11 +0000 | [diff] [blame] | 1007 | * set_page_dirty dirties all buffers in a page, independent |
| 1008 | * of their state. The dirty state however is entirely |
| 1009 | * meaningless for holes (!mapped && uptodate), so skip |
| 1010 | * buffers covering holes here. |
Eric Sandeen | 3d9b02e | 2010-06-24 09:45:30 +1000 | [diff] [blame] | 1011 | */ |
| 1012 | if (!buffer_mapped(bh) && buffer_uptodate(bh)) { |
Eric Sandeen | 3d9b02e | 2010-06-24 09:45:30 +1000 | [diff] [blame] | 1013 | imap_valid = 0; |
| 1014 | continue; |
| 1015 | } |
| 1016 | |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1017 | if (buffer_unwritten(bh)) { |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1018 | if (type != XFS_IO_UNWRITTEN) { |
| 1019 | type = XFS_IO_UNWRITTEN; |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1020 | imap_valid = 0; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1021 | } |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1022 | } else if (buffer_delay(bh)) { |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1023 | if (type != XFS_IO_DELALLOC) { |
| 1024 | type = XFS_IO_DELALLOC; |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1025 | imap_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | } |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1027 | } else if (buffer_uptodate(bh)) { |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1028 | if (type != XFS_IO_OVERWRITE) { |
| 1029 | type = XFS_IO_OVERWRITE; |
Christoph Hellwig | 85da94c | 2010-12-10 08:42:16 +0000 | [diff] [blame] | 1030 | imap_valid = 0; |
| 1031 | } |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1032 | } else { |
Alain Renaud | 7d0fa3e | 2012-06-08 15:34:46 -0400 | [diff] [blame] | 1033 | if (PageUptodate(page)) |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1034 | ASSERT(buffer_mapped(bh)); |
Alain Renaud | 7d0fa3e | 2012-06-08 15:34:46 -0400 | [diff] [blame] | 1035 | /* |
| 1036 | * This buffer is not uptodate and will not be |
| 1037 | * written to disk. Ensure that we will put any |
| 1038 | * subsequent writeable buffers into a new |
| 1039 | * ioend. |
| 1040 | */ |
| 1041 | imap_valid = 0; |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1042 | continue; |
| 1043 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1045 | if (imap_valid) |
| 1046 | imap_valid = xfs_imap_valid(inode, &imap, offset); |
| 1047 | if (!imap_valid) { |
| 1048 | /* |
| 1049 | * If we didn't have a valid mapping then we need to |
| 1050 | * put the new mapping into a separate ioend structure. |
| 1051 | * This ensures non-contiguous extents always have |
| 1052 | * separate ioends, which is particularly important |
| 1053 | * for unwritten extent conversion at I/O completion |
| 1054 | * time. |
| 1055 | */ |
| 1056 | new_ioend = 1; |
| 1057 | err = xfs_map_blocks(inode, offset, &imap, type, |
| 1058 | nonblocking); |
| 1059 | if (err) |
| 1060 | goto error; |
| 1061 | imap_valid = xfs_imap_valid(inode, &imap, offset); |
| 1062 | } |
| 1063 | if (imap_valid) { |
Christoph Hellwig | ecff71e | 2010-12-10 08:42:25 +0000 | [diff] [blame] | 1064 | lock_buffer(bh); |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1065 | if (type != XFS_IO_OVERWRITE) |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1066 | xfs_map_at_offset(inode, bh, &imap, offset); |
| 1067 | xfs_add_to_ioend(inode, bh, offset, type, &ioend, |
| 1068 | new_ioend); |
| 1069 | count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | } |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1071 | |
| 1072 | if (!iohead) |
| 1073 | iohead = ioend; |
| 1074 | |
| 1075 | } while (offset += len, ((bh = bh->b_this_page) != head)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | |
| 1077 | if (uptodate && bh == head) |
| 1078 | SetPageUptodate(page); |
| 1079 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1080 | xfs_start_page_writeback(page, 1, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 1082 | /* if there is no IO to be submitted for this page, we are done */ |
| 1083 | if (!ioend) |
| 1084 | return 0; |
| 1085 | |
| 1086 | ASSERT(iohead); |
| 1087 | |
| 1088 | /* |
| 1089 | * Any errors from this point onwards need tobe reported through the IO |
| 1090 | * completion path as we have marked the initial page as under writeback |
| 1091 | * and unlocked it. |
| 1092 | */ |
| 1093 | if (imap_valid) { |
Christoph Hellwig | bd1556a | 2010-04-28 12:29:00 +0000 | [diff] [blame] | 1094 | xfs_off_t end_index; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 1095 | |
Christoph Hellwig | bd1556a | 2010-04-28 12:29:00 +0000 | [diff] [blame] | 1096 | end_index = imap.br_startoff + imap.br_blockcount; |
| 1097 | |
| 1098 | /* to bytes */ |
| 1099 | end_index <<= inode->i_blkbits; |
| 1100 | |
| 1101 | /* to pages */ |
| 1102 | end_index = (end_index - 1) >> PAGE_CACHE_SHIFT; |
| 1103 | |
| 1104 | /* check against file size */ |
| 1105 | if (end_index > last_index) |
| 1106 | end_index = last_index; |
| 1107 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1108 | xfs_cluster_write(inode, page->index + 1, &imap, &ioend, |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 1109 | wbc, end_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | } |
| 1111 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1112 | |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 1113 | /* |
| 1114 | * Reserve log space if we might write beyond the on-disk inode size. |
| 1115 | */ |
| 1116 | err = 0; |
| 1117 | if (ioend->io_type != XFS_IO_UNWRITTEN && xfs_ioend_is_append(ioend)) |
| 1118 | err = xfs_setfilesize_trans_alloc(ioend); |
| 1119 | |
| 1120 | xfs_submit_ioend(wbc, iohead, err); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1121 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1122 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | |
| 1124 | error: |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1125 | if (iohead) |
| 1126 | xfs_cancel_ioend(iohead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | |
Christoph Hellwig | b5420f2 | 2010-08-24 11:47:51 +1000 | [diff] [blame] | 1128 | if (err == -EAGAIN) |
| 1129 | goto redirty; |
| 1130 | |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 1131 | xfs_aops_discard_page(page); |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1132 | ClearPageUptodate(page); |
| 1133 | unlock_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | return err; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1135 | |
Christoph Hellwig | b5420f2 | 2010-08-24 11:47:51 +1000 | [diff] [blame] | 1136 | redirty: |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1137 | redirty_page_for_writepage(wbc, page); |
| 1138 | unlock_page(page); |
| 1139 | return 0; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1140 | } |
| 1141 | |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1142 | STATIC int |
| 1143 | xfs_vm_writepages( |
| 1144 | struct address_space *mapping, |
| 1145 | struct writeback_control *wbc) |
| 1146 | { |
Christoph Hellwig | b3aea4e | 2007-08-29 11:44:37 +1000 | [diff] [blame] | 1147 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1148 | return generic_writepages(mapping, wbc); |
| 1149 | } |
| 1150 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1151 | /* |
| 1152 | * Called to move a page into cleanable state - and from there |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1153 | * to be released. The page should already be clean. We always |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1154 | * have buffer heads in this call. |
| 1155 | * |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1156 | * Returns 1 if the page is ok to release, 0 otherwise. |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1157 | */ |
| 1158 | STATIC int |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1159 | xfs_vm_releasepage( |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1160 | struct page *page, |
| 1161 | gfp_t gfp_mask) |
| 1162 | { |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 1163 | int delalloc, unwritten; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1164 | |
Lukas Czerner | 34097df | 2013-05-21 23:58:01 -0400 | [diff] [blame] | 1165 | trace_xfs_releasepage(page->mapping->host, page, 0, 0); |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1166 | |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 1167 | xfs_count_page_state(page, &delalloc, &unwritten); |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1168 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1169 | if (WARN_ON(delalloc)) |
| 1170 | return 0; |
| 1171 | if (WARN_ON(unwritten)) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1172 | return 0; |
| 1173 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1174 | return try_to_free_buffers(page); |
| 1175 | } |
| 1176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | STATIC int |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1178 | __xfs_get_blocks( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | struct inode *inode, |
| 1180 | sector_t iblock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | struct buffer_head *bh_result, |
| 1182 | int create, |
Christoph Hellwig | f2bde9b | 2010-06-24 11:44:35 +1000 | [diff] [blame] | 1183 | int direct) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | { |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1185 | struct xfs_inode *ip = XFS_I(inode); |
| 1186 | struct xfs_mount *mp = ip->i_mount; |
| 1187 | xfs_fileoff_t offset_fsb, end_fsb; |
| 1188 | int error = 0; |
| 1189 | int lockmode = 0; |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1190 | struct xfs_bmbt_irec imap; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1191 | int nimaps = 1; |
Nathan Scott | fdc7ed7 | 2005-11-02 15:13:13 +1100 | [diff] [blame] | 1192 | xfs_off_t offset; |
| 1193 | ssize_t size; |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1194 | int new = 0; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1195 | |
| 1196 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 1197 | return -XFS_ERROR(EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | |
Nathan Scott | fdc7ed7 | 2005-11-02 15:13:13 +1100 | [diff] [blame] | 1199 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1200 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
| 1201 | size = bh_result->b_size; |
Lachlan McIlroy | 364f358 | 2008-09-17 16:50:14 +1000 | [diff] [blame] | 1202 | |
| 1203 | if (!create && direct && offset >= i_size_read(inode)) |
| 1204 | return 0; |
| 1205 | |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1206 | /* |
| 1207 | * Direct I/O is usually done on preallocated files, so try getting |
| 1208 | * a block mapping without an exclusive lock first. For buffered |
| 1209 | * writes we already have the exclusive iolock anyway, so avoiding |
| 1210 | * a lock roundtrip here by taking the ilock exclusive from the |
| 1211 | * beginning is a useful micro optimization. |
| 1212 | */ |
| 1213 | if (create && !direct) { |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1214 | lockmode = XFS_ILOCK_EXCL; |
| 1215 | xfs_ilock(ip, lockmode); |
| 1216 | } else { |
| 1217 | lockmode = xfs_ilock_map_shared(ip); |
| 1218 | } |
Christoph Hellwig | f2bde9b | 2010-06-24 11:44:35 +1000 | [diff] [blame] | 1219 | |
Dave Chinner | d2c2819 | 2012-06-08 15:44:53 +1000 | [diff] [blame] | 1220 | ASSERT(offset <= mp->m_super->s_maxbytes); |
| 1221 | if (offset + size > mp->m_super->s_maxbytes) |
| 1222 | size = mp->m_super->s_maxbytes - offset; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1223 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); |
| 1224 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
| 1225 | |
Dave Chinner | 5c8ed20 | 2011-09-18 20:40:45 +0000 | [diff] [blame] | 1226 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
| 1227 | &imap, &nimaps, XFS_BMAPI_ENTIRE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | if (error) |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1229 | goto out_unlock; |
| 1230 | |
| 1231 | if (create && |
| 1232 | (!nimaps || |
| 1233 | (imap.br_startblock == HOLESTARTBLOCK || |
| 1234 | imap.br_startblock == DELAYSTARTBLOCK))) { |
Dave Chinner | aff3a9e | 2012-04-23 15:58:44 +1000 | [diff] [blame] | 1235 | if (direct || xfs_get_extsz_hint(ip)) { |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1236 | /* |
| 1237 | * Drop the ilock in preparation for starting the block |
| 1238 | * allocation transaction. It will be retaken |
| 1239 | * exclusively inside xfs_iomap_write_direct for the |
| 1240 | * actual allocation. |
| 1241 | */ |
| 1242 | xfs_iunlock(ip, lockmode); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1243 | error = xfs_iomap_write_direct(ip, offset, size, |
| 1244 | &imap, nimaps); |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1245 | if (error) |
| 1246 | return -error; |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1247 | new = 1; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1248 | } else { |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1249 | /* |
| 1250 | * Delalloc reservations do not require a transaction, |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1251 | * we can go on without dropping the lock here. If we |
| 1252 | * are allocating a new delalloc block, make sure that |
| 1253 | * we set the new flag so that we mark the buffer new so |
| 1254 | * that we know that it is newly allocated if the write |
| 1255 | * fails. |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1256 | */ |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1257 | if (nimaps && imap.br_startblock == HOLESTARTBLOCK) |
| 1258 | new = 1; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1259 | error = xfs_iomap_write_delay(ip, offset, size, &imap); |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1260 | if (error) |
| 1261 | goto out_unlock; |
| 1262 | |
| 1263 | xfs_iunlock(ip, lockmode); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1264 | } |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1265 | |
| 1266 | trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap); |
| 1267 | } else if (nimaps) { |
| 1268 | trace_xfs_get_blocks_found(ip, offset, size, 0, &imap); |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1269 | xfs_iunlock(ip, lockmode); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1270 | } else { |
| 1271 | trace_xfs_get_blocks_notfound(ip, offset, size); |
| 1272 | goto out_unlock; |
| 1273 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1275 | if (imap.br_startblock != HOLESTARTBLOCK && |
| 1276 | imap.br_startblock != DELAYSTARTBLOCK) { |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 1277 | /* |
| 1278 | * For unwritten extents do not report a disk address on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | * the read case (treat as if we're reading into a hole). |
| 1280 | */ |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1281 | if (create || !ISUNWRITTEN(&imap)) |
| 1282 | xfs_map_buffer(inode, bh_result, &imap, offset); |
| 1283 | if (create && ISUNWRITTEN(&imap)) { |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 1284 | if (direct) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | bh_result->b_private = inode; |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 1286 | set_buffer_defer_completion(bh_result); |
| 1287 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | set_buffer_unwritten(bh_result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | } |
| 1290 | } |
| 1291 | |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1292 | /* |
| 1293 | * If this is a realtime file, data may be on a different device. |
| 1294 | * to that pointed to from the buffer_head b_bdev currently. |
| 1295 | */ |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 1296 | bh_result->b_bdev = xfs_find_bdev_for_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1298 | /* |
David Chinner | 549054a | 2007-02-10 18:36:35 +1100 | [diff] [blame] | 1299 | * If we previously allocated a block out beyond eof and we are now |
| 1300 | * coming back to use it then we will need to flag it as new even if it |
| 1301 | * has a disk address. |
| 1302 | * |
| 1303 | * With sub-block writes into unwritten extents we also need to mark |
| 1304 | * the buffer as new so that the unwritten parts of the buffer gets |
| 1305 | * correctly zeroed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | */ |
| 1307 | if (create && |
| 1308 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || |
David Chinner | 549054a | 2007-02-10 18:36:35 +1100 | [diff] [blame] | 1309 | (offset >= i_size_read(inode)) || |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1310 | (new || ISUNWRITTEN(&imap)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | set_buffer_new(bh_result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1313 | if (imap.br_startblock == DELAYSTARTBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | BUG_ON(direct); |
| 1315 | if (create) { |
| 1316 | set_buffer_uptodate(bh_result); |
| 1317 | set_buffer_mapped(bh_result); |
| 1318 | set_buffer_delay(bh_result); |
| 1319 | } |
| 1320 | } |
| 1321 | |
Christoph Hellwig | 2b8f12b | 2010-04-28 12:28:59 +0000 | [diff] [blame] | 1322 | /* |
| 1323 | * If this is O_DIRECT or the mpage code calling tell them how large |
| 1324 | * the mapping is, so that we can avoid repeated get_blocks calls. |
| 1325 | */ |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1326 | if (direct || size > (1 << inode->i_blkbits)) { |
Christoph Hellwig | 2b8f12b | 2010-04-28 12:28:59 +0000 | [diff] [blame] | 1327 | xfs_off_t mapping_size; |
Christoph Hellwig | 9563b3d | 2010-04-28 12:28:53 +0000 | [diff] [blame] | 1328 | |
Christoph Hellwig | 2b8f12b | 2010-04-28 12:28:59 +0000 | [diff] [blame] | 1329 | mapping_size = imap.br_startoff + imap.br_blockcount - iblock; |
| 1330 | mapping_size <<= inode->i_blkbits; |
| 1331 | |
| 1332 | ASSERT(mapping_size > 0); |
| 1333 | if (mapping_size > size) |
| 1334 | mapping_size = size; |
| 1335 | if (mapping_size > LONG_MAX) |
| 1336 | mapping_size = LONG_MAX; |
| 1337 | |
| 1338 | bh_result->b_size = mapping_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | } |
| 1340 | |
| 1341 | return 0; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1342 | |
| 1343 | out_unlock: |
| 1344 | xfs_iunlock(ip, lockmode); |
| 1345 | return -error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | } |
| 1347 | |
| 1348 | int |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1349 | xfs_get_blocks( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | struct inode *inode, |
| 1351 | sector_t iblock, |
| 1352 | struct buffer_head *bh_result, |
| 1353 | int create) |
| 1354 | { |
Christoph Hellwig | f2bde9b | 2010-06-24 11:44:35 +1000 | [diff] [blame] | 1355 | return __xfs_get_blocks(inode, iblock, bh_result, create, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | } |
| 1357 | |
| 1358 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1359 | xfs_get_blocks_direct( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | struct inode *inode, |
| 1361 | sector_t iblock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | struct buffer_head *bh_result, |
| 1363 | int create) |
| 1364 | { |
Christoph Hellwig | f2bde9b | 2010-06-24 11:44:35 +1000 | [diff] [blame] | 1365 | return __xfs_get_blocks(inode, iblock, bh_result, create, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | } |
| 1367 | |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1368 | /* |
| 1369 | * Complete a direct I/O write request. |
| 1370 | * |
| 1371 | * If the private argument is non-NULL __xfs_get_blocks signals us that we |
| 1372 | * need to issue a transaction to convert the range from unwritten to written |
| 1373 | * extents. In case this is regular synchronous I/O we just call xfs_end_io |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1374 | * to do this and we are done. But in case this was a successful AIO |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1375 | * request this handler is called from interrupt context, from which we |
| 1376 | * can't start transactions. In that case offload the I/O completion to |
| 1377 | * the workqueues we also use for buffered I/O completion. |
| 1378 | */ |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1379 | STATIC void |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1380 | xfs_end_io_direct_write( |
| 1381 | struct kiocb *iocb, |
| 1382 | loff_t offset, |
| 1383 | ssize_t size, |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 1384 | void *private) |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1385 | { |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1386 | struct xfs_ioend *ioend = iocb->private; |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1387 | |
| 1388 | /* |
Christoph Hellwig | 2813d68 | 2011-12-18 20:00:12 +0000 | [diff] [blame] | 1389 | * While the generic direct I/O code updates the inode size, it does |
| 1390 | * so only after the end_io handler is called, which means our |
| 1391 | * end_io handler thinks the on-disk size is outside the in-core |
| 1392 | * size. To prevent this just update it a little bit earlier here. |
| 1393 | */ |
| 1394 | if (offset + size > i_size_read(ioend->io_inode)) |
| 1395 | i_size_write(ioend->io_inode, offset + size); |
| 1396 | |
| 1397 | /* |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 1398 | * blockdev_direct_IO can return an error even after the I/O |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1399 | * completion handler was called. Thus we need to protect |
| 1400 | * against double-freeing. |
| 1401 | */ |
| 1402 | iocb->private = NULL; |
Christoph Hellwig | 40e2e97 | 2010-07-18 21:17:09 +0000 | [diff] [blame] | 1403 | |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1404 | ioend->io_offset = offset; |
| 1405 | ioend->io_size = size; |
| 1406 | if (private && size > 0) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1407 | ioend->io_type = XFS_IO_UNWRITTEN; |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1408 | |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 1409 | xfs_finish_ioend_sync(ioend); |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1410 | } |
| 1411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | STATIC ssize_t |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1413 | xfs_vm_direct_IO( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | int rw, |
| 1415 | struct kiocb *iocb, |
| 1416 | const struct iovec *iov, |
| 1417 | loff_t offset, |
| 1418 | unsigned long nr_segs) |
| 1419 | { |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1420 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
| 1421 | struct block_device *bdev = xfs_find_bdev_for_inode(inode); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1422 | struct xfs_ioend *ioend = NULL; |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1423 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1425 | if (rw & WRITE) { |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1426 | size_t size = iov_length(iov, nr_segs); |
| 1427 | |
| 1428 | /* |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 1429 | * We cannot preallocate a size update transaction here as we |
| 1430 | * don't know whether allocation is necessary or not. Hence we |
| 1431 | * can only tell IO completion that one is necessary if we are |
| 1432 | * not doing unwritten extent conversion. |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1433 | */ |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1434 | iocb->private = ioend = xfs_alloc_ioend(inode, XFS_IO_DIRECT); |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 1435 | if (offset + size > XFS_I(inode)->i_d.di_size) |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1436 | ioend->io_isdirect = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 1438 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
| 1439 | offset, nr_segs, |
| 1440 | xfs_get_blocks_direct, |
| 1441 | xfs_end_io_direct_write, NULL, 0); |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1442 | if (ret != -EIOCBQUEUED && iocb->private) |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 1443 | goto out_destroy_ioend; |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1444 | } else { |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 1445 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
| 1446 | offset, nr_segs, |
| 1447 | xfs_get_blocks_direct, |
| 1448 | NULL, NULL, 0); |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1449 | } |
Christoph Hellwig | 5fe878a | 2009-12-15 16:47:50 -0800 | [diff] [blame] | 1450 | |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1451 | return ret; |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1452 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1453 | out_destroy_ioend: |
| 1454 | xfs_destroy_ioend(ioend); |
| 1455 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | } |
| 1457 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1458 | /* |
| 1459 | * Punch out the delalloc blocks we have already allocated. |
| 1460 | * |
| 1461 | * Don't bother with xfs_setattr given that nothing can have made it to disk yet |
| 1462 | * as the page is still locked at this point. |
| 1463 | */ |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1464 | STATIC void |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1465 | xfs_vm_kill_delalloc_range( |
| 1466 | struct inode *inode, |
| 1467 | loff_t start, |
| 1468 | loff_t end) |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1469 | { |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1470 | struct xfs_inode *ip = XFS_I(inode); |
| 1471 | xfs_fileoff_t start_fsb; |
| 1472 | xfs_fileoff_t end_fsb; |
| 1473 | int error; |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1474 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1475 | start_fsb = XFS_B_TO_FSB(ip->i_mount, start); |
| 1476 | end_fsb = XFS_B_TO_FSB(ip->i_mount, end); |
| 1477 | if (end_fsb <= start_fsb) |
| 1478 | return; |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 1479 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1480 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 1481 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, |
| 1482 | end_fsb - start_fsb); |
| 1483 | if (error) { |
| 1484 | /* something screwed, just bail */ |
| 1485 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
| 1486 | xfs_alert(ip->i_mount, |
| 1487 | "xfs_vm_write_failed: unable to clean up ino %lld", |
| 1488 | ip->i_ino); |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 1489 | } |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1490 | } |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1491 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1492 | } |
| 1493 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1494 | STATIC void |
| 1495 | xfs_vm_write_failed( |
| 1496 | struct inode *inode, |
| 1497 | struct page *page, |
| 1498 | loff_t pos, |
| 1499 | unsigned len) |
| 1500 | { |
Jie Liu | 58e5985 | 2013-07-16 13:11:16 +0800 | [diff] [blame] | 1501 | loff_t block_offset; |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1502 | loff_t block_start; |
| 1503 | loff_t block_end; |
| 1504 | loff_t from = pos & (PAGE_CACHE_SIZE - 1); |
| 1505 | loff_t to = from + len; |
| 1506 | struct buffer_head *bh, *head; |
| 1507 | |
Jie Liu | 58e5985 | 2013-07-16 13:11:16 +0800 | [diff] [blame] | 1508 | /* |
| 1509 | * The request pos offset might be 32 or 64 bit, this is all fine |
| 1510 | * on 64-bit platform. However, for 64-bit pos request on 32-bit |
| 1511 | * platform, the high 32-bit will be masked off if we evaluate the |
| 1512 | * block_offset via (pos & PAGE_MASK) because the PAGE_MASK is |
| 1513 | * 0xfffff000 as an unsigned long, hence the result is incorrect |
| 1514 | * which could cause the following ASSERT failed in most cases. |
| 1515 | * In order to avoid this, we can evaluate the block_offset of the |
| 1516 | * start of the page by using shifts rather than masks the mismatch |
| 1517 | * problem. |
| 1518 | */ |
| 1519 | block_offset = (pos >> PAGE_CACHE_SHIFT) << PAGE_CACHE_SHIFT; |
| 1520 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1521 | ASSERT(block_offset + from == pos); |
| 1522 | |
| 1523 | head = page_buffers(page); |
| 1524 | block_start = 0; |
| 1525 | for (bh = head; bh != head || !block_start; |
| 1526 | bh = bh->b_this_page, block_start = block_end, |
| 1527 | block_offset += bh->b_size) { |
| 1528 | block_end = block_start + bh->b_size; |
| 1529 | |
| 1530 | /* skip buffers before the write */ |
| 1531 | if (block_end <= from) |
| 1532 | continue; |
| 1533 | |
| 1534 | /* if the buffer is after the write, we're done */ |
| 1535 | if (block_start >= to) |
| 1536 | break; |
| 1537 | |
| 1538 | if (!buffer_delay(bh)) |
| 1539 | continue; |
| 1540 | |
| 1541 | if (!buffer_new(bh) && block_offset < i_size_read(inode)) |
| 1542 | continue; |
| 1543 | |
| 1544 | xfs_vm_kill_delalloc_range(inode, block_offset, |
| 1545 | block_offset + bh->b_size); |
| 1546 | } |
| 1547 | |
| 1548 | } |
| 1549 | |
| 1550 | /* |
| 1551 | * This used to call block_write_begin(), but it unlocks and releases the page |
| 1552 | * on error, and we need that page to be able to punch stale delalloc blocks out |
| 1553 | * on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at |
| 1554 | * the appropriate point. |
| 1555 | */ |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1556 | STATIC int |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1557 | xfs_vm_write_begin( |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1558 | struct file *file, |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1559 | struct address_space *mapping, |
| 1560 | loff_t pos, |
| 1561 | unsigned len, |
| 1562 | unsigned flags, |
| 1563 | struct page **pagep, |
| 1564 | void **fsdata) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1565 | { |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1566 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
| 1567 | struct page *page; |
| 1568 | int status; |
Christoph Hellwig | 155130a | 2010-06-04 11:29:58 +0200 | [diff] [blame] | 1569 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1570 | ASSERT(len <= PAGE_CACHE_SIZE); |
| 1571 | |
| 1572 | page = grab_cache_page_write_begin(mapping, index, |
| 1573 | flags | AOP_FLAG_NOFS); |
| 1574 | if (!page) |
| 1575 | return -ENOMEM; |
| 1576 | |
| 1577 | status = __block_write_begin(page, pos, len, xfs_get_blocks); |
| 1578 | if (unlikely(status)) { |
| 1579 | struct inode *inode = mapping->host; |
| 1580 | |
| 1581 | xfs_vm_write_failed(inode, page, pos, len); |
| 1582 | unlock_page(page); |
| 1583 | |
| 1584 | if (pos + len > i_size_read(inode)) |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame^] | 1585 | truncate_pagecache(inode, i_size_read(inode)); |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1586 | |
| 1587 | page_cache_release(page); |
| 1588 | page = NULL; |
| 1589 | } |
| 1590 | |
| 1591 | *pagep = page; |
| 1592 | return status; |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1593 | } |
Christoph Hellwig | 155130a | 2010-06-04 11:29:58 +0200 | [diff] [blame] | 1594 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1595 | /* |
| 1596 | * On failure, we only need to kill delalloc blocks beyond EOF because they |
| 1597 | * will never be written. For blocks within EOF, generic_write_end() zeros them |
| 1598 | * so they are safe to leave alone and be written with all the other valid data. |
| 1599 | */ |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1600 | STATIC int |
| 1601 | xfs_vm_write_end( |
| 1602 | struct file *file, |
| 1603 | struct address_space *mapping, |
| 1604 | loff_t pos, |
| 1605 | unsigned len, |
| 1606 | unsigned copied, |
| 1607 | struct page *page, |
| 1608 | void *fsdata) |
| 1609 | { |
| 1610 | int ret; |
| 1611 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1612 | ASSERT(len <= PAGE_CACHE_SIZE); |
| 1613 | |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1614 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1615 | if (unlikely(ret < len)) { |
| 1616 | struct inode *inode = mapping->host; |
| 1617 | size_t isize = i_size_read(inode); |
| 1618 | loff_t to = pos + len; |
| 1619 | |
| 1620 | if (to > isize) { |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame^] | 1621 | truncate_pagecache(inode, isize); |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1622 | xfs_vm_kill_delalloc_range(inode, isize, to); |
| 1623 | } |
| 1624 | } |
Christoph Hellwig | 155130a | 2010-06-04 11:29:58 +0200 | [diff] [blame] | 1625 | return ret; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1626 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | |
| 1628 | STATIC sector_t |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1629 | xfs_vm_bmap( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | struct address_space *mapping, |
| 1631 | sector_t block) |
| 1632 | { |
| 1633 | struct inode *inode = (struct inode *)mapping->host; |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 1634 | struct xfs_inode *ip = XFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | |
Christoph Hellwig | cca28fb | 2010-06-24 11:57:09 +1000 | [diff] [blame] | 1636 | trace_xfs_vm_bmap(XFS_I(inode)); |
Christoph Hellwig | 126468b | 2008-03-06 13:44:57 +1100 | [diff] [blame] | 1637 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
Dave Chinner | 4bc1ea6 | 2012-11-12 22:53:56 +1100 | [diff] [blame] | 1638 | filemap_write_and_wait(mapping); |
Christoph Hellwig | 126468b | 2008-03-06 13:44:57 +1100 | [diff] [blame] | 1639 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1640 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | } |
| 1642 | |
| 1643 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1644 | xfs_vm_readpage( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | struct file *unused, |
| 1646 | struct page *page) |
| 1647 | { |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1648 | return mpage_readpage(page, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | } |
| 1650 | |
| 1651 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1652 | xfs_vm_readpages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | struct file *unused, |
| 1654 | struct address_space *mapping, |
| 1655 | struct list_head *pages, |
| 1656 | unsigned nr_pages) |
| 1657 | { |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1658 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | } |
| 1660 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1661 | const struct address_space_operations xfs_address_space_operations = { |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1662 | .readpage = xfs_vm_readpage, |
| 1663 | .readpages = xfs_vm_readpages, |
| 1664 | .writepage = xfs_vm_writepage, |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1665 | .writepages = xfs_vm_writepages, |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1666 | .releasepage = xfs_vm_releasepage, |
| 1667 | .invalidatepage = xfs_vm_invalidatepage, |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1668 | .write_begin = xfs_vm_write_begin, |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1669 | .write_end = xfs_vm_write_end, |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1670 | .bmap = xfs_vm_bmap, |
| 1671 | .direct_IO = xfs_vm_direct_IO, |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 1672 | .migratepage = buffer_migrate_page, |
Hisashi Hifumi | bddaafa | 2009-03-29 09:53:38 +0200 | [diff] [blame] | 1673 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1674 | .error_remove_page = generic_error_remove_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | }; |