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 | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 31 | #include "xfs_vnodeops.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 32 | #include "xfs_trace.h" |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 33 | #include "xfs_bmap.h" |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/mpage.h> |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 36 | #include <linux/pagevec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/writeback.h> |
| 38 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 39 | void |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 40 | xfs_count_page_state( |
| 41 | struct page *page, |
| 42 | int *delalloc, |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 43 | int *unwritten) |
| 44 | { |
| 45 | struct buffer_head *bh, *head; |
| 46 | |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 47 | *delalloc = *unwritten = 0; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 48 | |
| 49 | bh = head = page_buffers(page); |
| 50 | do { |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 51 | if (buffer_unwritten(bh)) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 52 | (*unwritten) = 1; |
| 53 | else if (buffer_delay(bh)) |
| 54 | (*delalloc) = 1; |
| 55 | } while ((bh = bh->b_this_page) != head); |
| 56 | } |
| 57 | |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 58 | STATIC struct block_device * |
| 59 | xfs_find_bdev_for_inode( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 60 | struct inode *inode) |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 61 | { |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 62 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 63 | struct xfs_mount *mp = ip->i_mount; |
| 64 | |
Eric Sandeen | 71ddabb | 2007-11-23 16:29:42 +1100 | [diff] [blame] | 65 | if (XFS_IS_REALTIME_INODE(ip)) |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 66 | return mp->m_rtdev_targp->bt_bdev; |
| 67 | else |
| 68 | return mp->m_ddev_targp->bt_bdev; |
| 69 | } |
| 70 | |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 71 | /* |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 72 | * We're now finished for good with this ioend structure. |
| 73 | * Update the page state via the associated buffer_heads, |
| 74 | * release holds on the inode and bio, and finally free |
| 75 | * up memory. Do not use the ioend after this. |
| 76 | */ |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 77 | STATIC void |
| 78 | xfs_destroy_ioend( |
| 79 | xfs_ioend_t *ioend) |
| 80 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 81 | struct buffer_head *bh, *next; |
| 82 | |
| 83 | for (bh = ioend->io_buffer_head; bh; bh = next) { |
| 84 | next = bh->b_private; |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 85 | bh->b_end_io(bh, !ioend->io_error); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 86 | } |
Christoph Hellwig | 583fa58 | 2008-12-03 12:20:38 +0100 | [diff] [blame] | 87 | |
Christoph Hellwig | c859cdd | 2011-08-23 08:28:10 +0000 | [diff] [blame] | 88 | if (ioend->io_iocb) { |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 89 | if (ioend->io_isasync) { |
| 90 | aio_complete(ioend->io_iocb, ioend->io_error ? |
| 91 | ioend->io_error : ioend->io_result, 0); |
| 92 | } |
Christoph Hellwig | c859cdd | 2011-08-23 08:28:10 +0000 | [diff] [blame] | 93 | inode_dio_done(ioend->io_inode); |
| 94 | } |
Christoph Hellwig | 4a06fd2 | 2011-08-23 08:28:13 +0000 | [diff] [blame] | 95 | |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 96 | mempool_free(ioend, xfs_ioend_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | /* |
Christoph Hellwig | fc0063c | 2011-08-23 08:28:11 +0000 | [diff] [blame] | 100 | * Fast and loose check if this write could update the on-disk inode size. |
| 101 | */ |
| 102 | static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend) |
| 103 | { |
| 104 | return ioend->io_offset + ioend->io_size > |
| 105 | XFS_I(ioend->io_inode)->i_d.di_size; |
| 106 | } |
| 107 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 108 | STATIC int |
| 109 | xfs_setfilesize_trans_alloc( |
| 110 | struct xfs_ioend *ioend) |
| 111 | { |
| 112 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
| 113 | struct xfs_trans *tp; |
| 114 | int error; |
| 115 | |
| 116 | tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); |
| 117 | |
| 118 | error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0); |
| 119 | if (error) { |
| 120 | xfs_trans_cancel(tp, 0); |
| 121 | return error; |
| 122 | } |
| 123 | |
| 124 | ioend->io_append_trans = tp; |
| 125 | |
| 126 | /* |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 127 | * We may pass freeze protection with a transaction. So tell lockdep |
Jan Kara | d9457dc | 2012-06-12 16:20:39 +0200 | [diff] [blame] | 128 | * we released it. |
| 129 | */ |
| 130 | rwsem_release(&ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], |
| 131 | 1, _THIS_IP_); |
| 132 | /* |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 133 | * We hand off the transaction to the completion thread now, so |
| 134 | * clear the flag here. |
| 135 | */ |
| 136 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); |
| 137 | return 0; |
| 138 | } |
| 139 | |
Christoph Hellwig | fc0063c | 2011-08-23 08:28:11 +0000 | [diff] [blame] | 140 | /* |
Christoph Hellwig | 2813d68 | 2011-12-18 20:00:12 +0000 | [diff] [blame] | 141 | * 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] | 142 | */ |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 143 | STATIC int |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 144 | xfs_setfilesize( |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 145 | struct xfs_ioend *ioend) |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 146 | { |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 147 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 148 | struct xfs_trans *tp = ioend->io_append_trans; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 149 | xfs_fsize_t isize; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 150 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 151 | /* |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 152 | * The transaction may have been allocated in the I/O submission thread, |
| 153 | * thus we need to mark ourselves as beeing in a transaction manually. |
| 154 | * Similarly for freeze protection. |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 155 | */ |
| 156 | current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 157 | rwsem_acquire_read(&VFS_I(ip)->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], |
| 158 | 0, 1, _THIS_IP_); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 159 | |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 160 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
Christoph Hellwig | 6923e68 | 2012-02-29 09:53:49 +0000 | [diff] [blame] | 161 | isize = xfs_new_eof(ip, ioend->io_offset + ioend->io_size); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 162 | if (!isize) { |
| 163 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 164 | xfs_trans_cancel(tp, 0); |
| 165 | return 0; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 166 | } |
| 167 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 168 | trace_xfs_setfilesize(ip, ioend->io_offset, ioend->io_size); |
| 169 | |
| 170 | ip->i_d.di_size = isize; |
| 171 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
| 172 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| 173 | |
| 174 | return xfs_trans_commit(tp, 0); |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | /* |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 178 | * Schedule IO completion handling on the final put of an ioend. |
Christoph Hellwig | fc0063c | 2011-08-23 08:28:11 +0000 | [diff] [blame] | 179 | * |
| 180 | * If there is no work to do we might as well call it a day and free the |
| 181 | * ioend right now. |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 182 | */ |
| 183 | STATIC void |
| 184 | xfs_finish_ioend( |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 185 | struct xfs_ioend *ioend) |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 186 | { |
| 187 | if (atomic_dec_and_test(&ioend->io_remaining)) { |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 188 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
| 189 | |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 190 | if (ioend->io_type == XFS_IO_UNWRITTEN) |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 191 | queue_work(mp->m_unwritten_workqueue, &ioend->io_work); |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 192 | else if (ioend->io_append_trans || |
| 193 | (ioend->io_isdirect && xfs_ioend_is_append(ioend))) |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 194 | queue_work(mp->m_data_workqueue, &ioend->io_work); |
Christoph Hellwig | fc0063c | 2011-08-23 08:28:11 +0000 | [diff] [blame] | 195 | else |
| 196 | xfs_destroy_ioend(ioend); |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 197 | } |
| 198 | } |
| 199 | |
| 200 | /* |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 201 | * IO write completion. |
| 202 | */ |
| 203 | STATIC void |
| 204 | xfs_end_io( |
| 205 | struct work_struct *work) |
| 206 | { |
| 207 | xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work); |
| 208 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
Dave Chinner | 6941893 | 2010-03-04 00:57:09 +0000 | [diff] [blame] | 209 | int error = 0; |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 210 | |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 211 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
Christoph Hellwig | 810627d | 2011-11-08 08:56:15 +0000 | [diff] [blame] | 212 | ioend->io_error = -EIO; |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 213 | goto done; |
| 214 | } |
| 215 | if (ioend->io_error) |
| 216 | goto done; |
| 217 | |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 218 | /* |
| 219 | * For unwritten extents we need to issue transactions to convert a |
| 220 | * range to normal written extens after the data I/O has finished. |
| 221 | */ |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 222 | if (ioend->io_type == XFS_IO_UNWRITTEN) { |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 223 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 224 | ioend->io_size); |
| 225 | } else if (ioend->io_isdirect && xfs_ioend_is_append(ioend)) { |
| 226 | /* |
| 227 | * For direct I/O we do not know if we need to allocate blocks |
| 228 | * or not so we can't preallocate an append transaction as that |
| 229 | * results in nested reservations and log space deadlocks. Hence |
| 230 | * allocate the transaction here. While this is sub-optimal and |
| 231 | * can block IO completion for some time, we're stuck with doing |
| 232 | * it this way until we can pass the ioend to the direct IO |
| 233 | * allocation callbacks and avoid nesting that way. |
| 234 | */ |
| 235 | error = xfs_setfilesize_trans_alloc(ioend); |
| 236 | if (error) |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 237 | goto done; |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 238 | error = xfs_setfilesize(ioend); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 239 | } else if (ioend->io_append_trans) { |
| 240 | error = xfs_setfilesize(ioend); |
Christoph Hellwig | 84803fb | 2012-02-29 09:53:50 +0000 | [diff] [blame] | 241 | } else { |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 242 | ASSERT(!xfs_ioend_is_append(ioend)); |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 243 | } |
| 244 | |
Christoph Hellwig | 04f658e | 2011-08-24 05:59:25 +0000 | [diff] [blame] | 245 | done: |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 246 | if (error) |
| 247 | ioend->io_error = -error; |
Christoph Hellwig | aa6bf01 | 2012-02-29 09:53:48 +0000 | [diff] [blame] | 248 | xfs_destroy_ioend(ioend); |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | /* |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 252 | * Call IO completion handling in caller context on the final put of an ioend. |
| 253 | */ |
| 254 | STATIC void |
| 255 | xfs_finish_ioend_sync( |
| 256 | struct xfs_ioend *ioend) |
| 257 | { |
| 258 | if (atomic_dec_and_test(&ioend->io_remaining)) |
| 259 | xfs_end_io(&ioend->io_work); |
| 260 | } |
| 261 | |
| 262 | /* |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 263 | * Allocate and initialise an IO completion structure. |
| 264 | * We need to track unwritten extent write completion here initially. |
| 265 | * We'll need to extend this for updating the ondisk inode size later |
| 266 | * (vs. incore size). |
| 267 | */ |
| 268 | STATIC xfs_ioend_t * |
| 269 | xfs_alloc_ioend( |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 270 | struct inode *inode, |
| 271 | unsigned int type) |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 272 | { |
| 273 | xfs_ioend_t *ioend; |
| 274 | |
| 275 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); |
| 276 | |
| 277 | /* |
| 278 | * Set the count to 1 initially, which will prevent an I/O |
| 279 | * completion callback from happening before we have started |
| 280 | * all the I/O from calling the completion routine too early. |
| 281 | */ |
| 282 | atomic_set(&ioend->io_remaining, 1); |
Christoph Hellwig | c859cdd | 2011-08-23 08:28:10 +0000 | [diff] [blame] | 283 | ioend->io_isasync = 0; |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 284 | ioend->io_isdirect = 0; |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 285 | ioend->io_error = 0; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 286 | ioend->io_list = NULL; |
| 287 | ioend->io_type = type; |
Christoph Hellwig | b677c21 | 2007-08-29 11:46:28 +1000 | [diff] [blame] | 288 | ioend->io_inode = inode; |
Christoph Hellwig | c1a073b | 2005-09-05 08:23:35 +1000 | [diff] [blame] | 289 | ioend->io_buffer_head = NULL; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 290 | ioend->io_buffer_tail = NULL; |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 291 | ioend->io_offset = 0; |
| 292 | ioend->io_size = 0; |
Christoph Hellwig | fb511f2 | 2010-07-18 21:17:10 +0000 | [diff] [blame] | 293 | ioend->io_iocb = NULL; |
| 294 | ioend->io_result = 0; |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 295 | ioend->io_append_trans = NULL; |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 296 | |
Christoph Hellwig | 5ec4fab | 2009-10-30 09:11:47 +0000 | [diff] [blame] | 297 | INIT_WORK(&ioend->io_work, xfs_end_io); |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 298 | return ioend; |
| 299 | } |
| 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | STATIC int |
| 302 | xfs_map_blocks( |
| 303 | struct inode *inode, |
| 304 | loff_t offset, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 305 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 306 | int type, |
| 307 | int nonblocking) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 309 | struct xfs_inode *ip = XFS_I(inode); |
| 310 | struct xfs_mount *mp = ip->i_mount; |
Christoph Hellwig | ed1e7b7 | 2010-12-10 08:42:22 +0000 | [diff] [blame] | 311 | ssize_t count = 1 << inode->i_blkbits; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 312 | xfs_fileoff_t offset_fsb, end_fsb; |
| 313 | int error = 0; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 314 | int bmapi_flags = XFS_BMAPI_ENTIRE; |
| 315 | int nimaps = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 317 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 318 | return -XFS_ERROR(EIO); |
| 319 | |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 320 | if (type == XFS_IO_UNWRITTEN) |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 321 | bmapi_flags |= XFS_BMAPI_IGSTATE; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 322 | |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 323 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { |
| 324 | if (nonblocking) |
| 325 | return -XFS_ERROR(EAGAIN); |
| 326 | xfs_ilock(ip, XFS_ILOCK_SHARED); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 327 | } |
| 328 | |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 329 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
| 330 | (ip->i_df.if_flags & XFS_IFEXTENTS)); |
Dave Chinner | d2c2819 | 2012-06-08 15:44:53 +1000 | [diff] [blame] | 331 | ASSERT(offset <= mp->m_super->s_maxbytes); |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 332 | |
Dave Chinner | d2c2819 | 2012-06-08 15:44:53 +1000 | [diff] [blame] | 333 | if (offset + count > mp->m_super->s_maxbytes) |
| 334 | count = mp->m_super->s_maxbytes - offset; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 335 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
| 336 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
Dave Chinner | 5c8ed20 | 2011-09-18 20:40:45 +0000 | [diff] [blame] | 337 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
| 338 | imap, &nimaps, bmapi_flags); |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 339 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
| 340 | |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 341 | if (error) |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 342 | return -XFS_ERROR(error); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 343 | |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 344 | if (type == XFS_IO_DELALLOC && |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 345 | (!nimaps || isnullstartblock(imap->br_startblock))) { |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 346 | error = xfs_iomap_write_allocate(ip, offset, count, imap); |
| 347 | if (!error) |
| 348 | trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 349 | return -XFS_ERROR(error); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 350 | } |
| 351 | |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 352 | #ifdef DEBUG |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 353 | if (type == XFS_IO_UNWRITTEN) { |
Christoph Hellwig | 8ff2957 | 2010-12-10 08:42:21 +0000 | [diff] [blame] | 354 | ASSERT(nimaps); |
| 355 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
| 356 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); |
| 357 | } |
| 358 | #endif |
| 359 | if (nimaps) |
| 360 | trace_xfs_map_blocks_found(ip, offset, count, type, imap); |
| 361 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 364 | STATIC int |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 365 | xfs_imap_valid( |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 366 | struct inode *inode, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 367 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 368 | xfs_off_t offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 370 | offset >>= inode->i_blkbits; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 371 | |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 372 | return offset >= imap->br_startoff && |
| 373 | offset < imap->br_startoff + imap->br_blockcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 376 | /* |
| 377 | * BIO completion handler for buffered IO. |
| 378 | */ |
Al Viro | 782e3b3 | 2007-10-12 07:17:47 +0100 | [diff] [blame] | 379 | STATIC void |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 380 | xfs_end_bio( |
| 381 | struct bio *bio, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 382 | int error) |
| 383 | { |
| 384 | xfs_ioend_t *ioend = bio->bi_private; |
| 385 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 386 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 387 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 388 | |
| 389 | /* Toss bio and pass work off to an xfsdatad thread */ |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 390 | bio->bi_private = NULL; |
| 391 | bio->bi_end_io = NULL; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 392 | bio_put(bio); |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 393 | |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 394 | xfs_finish_ioend(ioend); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | STATIC void |
| 398 | xfs_submit_ioend_bio( |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 399 | struct writeback_control *wbc, |
| 400 | xfs_ioend_t *ioend, |
| 401 | struct bio *bio) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 402 | { |
| 403 | atomic_inc(&ioend->io_remaining); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 404 | bio->bi_private = ioend; |
| 405 | bio->bi_end_io = xfs_end_bio; |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 406 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | STATIC struct bio * |
| 410 | xfs_alloc_ioend_bio( |
| 411 | struct buffer_head *bh) |
| 412 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 413 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
Christoph Hellwig | 221cb25 | 2010-12-10 08:42:17 +0000 | [diff] [blame] | 414 | struct bio *bio = bio_alloc(GFP_NOIO, nvecs); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 415 | |
| 416 | ASSERT(bio->bi_private == NULL); |
| 417 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
| 418 | bio->bi_bdev = bh->b_bdev; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 419 | return bio; |
| 420 | } |
| 421 | |
| 422 | STATIC void |
| 423 | xfs_start_buffer_writeback( |
| 424 | struct buffer_head *bh) |
| 425 | { |
| 426 | ASSERT(buffer_mapped(bh)); |
| 427 | ASSERT(buffer_locked(bh)); |
| 428 | ASSERT(!buffer_delay(bh)); |
| 429 | ASSERT(!buffer_unwritten(bh)); |
| 430 | |
| 431 | mark_buffer_async_write(bh); |
| 432 | set_buffer_uptodate(bh); |
| 433 | clear_buffer_dirty(bh); |
| 434 | } |
| 435 | |
| 436 | STATIC void |
| 437 | xfs_start_page_writeback( |
| 438 | struct page *page, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 439 | int clear_dirty, |
| 440 | int buffers) |
| 441 | { |
| 442 | ASSERT(PageLocked(page)); |
| 443 | ASSERT(!PageWriteback(page)); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 444 | if (clear_dirty) |
David Chinner | 9213202 | 2006-12-21 10:24:01 +1100 | [diff] [blame] | 445 | clear_page_dirty_for_io(page); |
| 446 | set_page_writeback(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 447 | unlock_page(page); |
Fengguang Wu | 1f7decf | 2007-10-16 23:30:42 -0700 | [diff] [blame] | 448 | /* If no buffers on the page are to be written, finish it here */ |
| 449 | if (!buffers) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 450 | end_page_writeback(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) |
| 454 | { |
| 455 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); |
| 456 | } |
| 457 | |
| 458 | /* |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 459 | * Submit all of the bios for all of the ioends we have saved up, covering the |
| 460 | * initial writepage page and also any probed pages. |
| 461 | * |
| 462 | * Because we may have multiple ioends spanning a page, we need to start |
| 463 | * writeback on all the buffers before we submit them for I/O. If we mark the |
| 464 | * buffers as we got, then we can end up with a page that only has buffers |
| 465 | * marked async write and I/O complete on can occur before we mark the other |
| 466 | * buffers async write. |
| 467 | * |
| 468 | * The end result of this is that we trip a bug in end_page_writeback() because |
| 469 | * we call it twice for the one page as the code in end_buffer_async_write() |
| 470 | * assumes that all buffers on the page are started at the same time. |
| 471 | * |
| 472 | * 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] | 473 | * 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] | 474 | * |
| 475 | * If @fail is non-zero, it means that we have a situation where some part of |
| 476 | * the submission process has failed after we have marked paged for writeback |
| 477 | * and unlocked them. In this situation, we need to fail the ioend chain rather |
| 478 | * 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] | 479 | */ |
| 480 | STATIC void |
| 481 | xfs_submit_ioend( |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 482 | struct writeback_control *wbc, |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 483 | xfs_ioend_t *ioend, |
| 484 | int fail) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 485 | { |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 486 | xfs_ioend_t *head = ioend; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 487 | xfs_ioend_t *next; |
| 488 | struct buffer_head *bh; |
| 489 | struct bio *bio; |
| 490 | sector_t lastblock = 0; |
| 491 | |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 492 | /* Pass 1 - start writeback */ |
| 493 | do { |
| 494 | next = ioend->io_list; |
Christoph Hellwig | 221cb25 | 2010-12-10 08:42:17 +0000 | [diff] [blame] | 495 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 496 | xfs_start_buffer_writeback(bh); |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 497 | } while ((ioend = next) != NULL); |
| 498 | |
| 499 | /* Pass 2 - submit I/O */ |
| 500 | ioend = head; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 501 | do { |
| 502 | next = ioend->io_list; |
| 503 | bio = NULL; |
| 504 | |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 505 | /* |
| 506 | * If we are failing the IO now, just mark the ioend with an |
| 507 | * error and finish it. This will run IO completion immediately |
| 508 | * as there is only one reference to the ioend at this point in |
| 509 | * time. |
| 510 | */ |
| 511 | if (fail) { |
| 512 | ioend->io_error = -fail; |
| 513 | xfs_finish_ioend(ioend); |
| 514 | continue; |
| 515 | } |
| 516 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 517 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 518 | |
| 519 | if (!bio) { |
| 520 | retry: |
| 521 | bio = xfs_alloc_ioend_bio(bh); |
| 522 | } else if (bh->b_blocknr != lastblock + 1) { |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 523 | xfs_submit_ioend_bio(wbc, ioend, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 524 | goto retry; |
| 525 | } |
| 526 | |
| 527 | if (bio_add_buffer(bio, bh) != bh->b_size) { |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 528 | xfs_submit_ioend_bio(wbc, ioend, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 529 | goto retry; |
| 530 | } |
| 531 | |
| 532 | lastblock = bh->b_blocknr; |
| 533 | } |
| 534 | if (bio) |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 535 | xfs_submit_ioend_bio(wbc, ioend, bio); |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 536 | xfs_finish_ioend(ioend); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 537 | } while ((ioend = next) != NULL); |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * Cancel submission of all buffer_heads so far in this endio. |
| 542 | * Toss the endio too. Only ever called for the initial page |
| 543 | * in a writepage request, so only ever one page. |
| 544 | */ |
| 545 | STATIC void |
| 546 | xfs_cancel_ioend( |
| 547 | xfs_ioend_t *ioend) |
| 548 | { |
| 549 | xfs_ioend_t *next; |
| 550 | struct buffer_head *bh, *next_bh; |
| 551 | |
| 552 | do { |
| 553 | next = ioend->io_list; |
| 554 | bh = ioend->io_buffer_head; |
| 555 | do { |
| 556 | next_bh = bh->b_private; |
| 557 | clear_buffer_async_write(bh); |
| 558 | unlock_buffer(bh); |
| 559 | } while ((bh = next_bh) != NULL); |
| 560 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 561 | mempool_free(ioend, xfs_ioend_pool); |
| 562 | } while ((ioend = next) != NULL); |
| 563 | } |
| 564 | |
| 565 | /* |
| 566 | * Test to see if we've been building up a completion structure for |
| 567 | * earlier buffers -- if so, we try to append to this ioend if we |
| 568 | * can, otherwise we finish off any current ioend and start another. |
| 569 | * Return true if we've finished the given ioend. |
| 570 | */ |
| 571 | STATIC void |
| 572 | xfs_add_to_ioend( |
| 573 | struct inode *inode, |
| 574 | struct buffer_head *bh, |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 575 | xfs_off_t offset, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 576 | unsigned int type, |
| 577 | xfs_ioend_t **result, |
| 578 | int need_ioend) |
| 579 | { |
| 580 | xfs_ioend_t *ioend = *result; |
| 581 | |
| 582 | if (!ioend || need_ioend || type != ioend->io_type) { |
| 583 | xfs_ioend_t *previous = *result; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 584 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 585 | ioend = xfs_alloc_ioend(inode, type); |
| 586 | ioend->io_offset = offset; |
| 587 | ioend->io_buffer_head = bh; |
| 588 | ioend->io_buffer_tail = bh; |
| 589 | if (previous) |
| 590 | previous->io_list = ioend; |
| 591 | *result = ioend; |
| 592 | } else { |
| 593 | ioend->io_buffer_tail->b_private = bh; |
| 594 | ioend->io_buffer_tail = bh; |
| 595 | } |
| 596 | |
| 597 | bh->b_private = NULL; |
| 598 | ioend->io_size += bh->b_size; |
| 599 | } |
| 600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | STATIC void |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 602 | xfs_map_buffer( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 603 | struct inode *inode, |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 604 | struct buffer_head *bh, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 605 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 606 | xfs_off_t offset) |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 607 | { |
| 608 | sector_t bn; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 609 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 610 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff); |
| 611 | 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] | 612 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 613 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
| 614 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 615 | |
Christoph Hellwig | e513182 | 2010-04-28 12:28:55 +0000 | [diff] [blame] | 616 | bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) + |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 617 | ((offset - iomap_offset) >> inode->i_blkbits); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 618 | |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 619 | ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode))); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 620 | |
| 621 | bh->b_blocknr = bn; |
| 622 | set_buffer_mapped(bh); |
| 623 | } |
| 624 | |
| 625 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | xfs_map_at_offset( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 627 | struct inode *inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | struct buffer_head *bh, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 629 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 630 | xfs_off_t offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | { |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 632 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
| 633 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 635 | xfs_map_buffer(inode, bh, imap, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | set_buffer_mapped(bh); |
| 637 | clear_buffer_delay(bh); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 638 | clear_buffer_unwritten(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | /* |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 642 | * Test if a given page is suitable for writing as part of an unwritten |
| 643 | * or delayed allocate extent. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | */ |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 645 | STATIC int |
Dave Chinner | 6ffc4db | 2012-04-23 15:58:43 +1000 | [diff] [blame] | 646 | xfs_check_page_type( |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 647 | struct page *page, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 648 | unsigned int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | if (PageWriteback(page)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 651 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
| 653 | if (page->mapping && page_has_buffers(page)) { |
| 654 | struct buffer_head *bh, *head; |
| 655 | int acceptable = 0; |
| 656 | |
| 657 | bh = head = page_buffers(page); |
| 658 | do { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 659 | if (buffer_unwritten(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 660 | acceptable += (type == XFS_IO_UNWRITTEN); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 661 | else if (buffer_delay(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 662 | acceptable += (type == XFS_IO_DELALLOC); |
David Chinner | 2ddee84 | 2006-03-22 12:47:40 +1100 | [diff] [blame] | 663 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 664 | acceptable += (type == XFS_IO_OVERWRITE); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 665 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | } while ((bh = bh->b_this_page) != head); |
| 668 | |
| 669 | if (acceptable) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 670 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | } |
| 672 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 673 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | } |
| 675 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | /* |
| 677 | * Allocate & map buffers for page given the extent map. Write it out. |
| 678 | * except for the original page of a writepage, this is called on |
| 679 | * delalloc/unwritten pages only, for the original page it is possible |
| 680 | * that the page has no mapping at all. |
| 681 | */ |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 682 | STATIC int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | xfs_convert_page( |
| 684 | struct inode *inode, |
| 685 | struct page *page, |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 686 | loff_t tindex, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 687 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 688 | xfs_ioend_t **ioendp, |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 689 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 691 | struct buffer_head *bh, *head; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 692 | xfs_off_t end_offset; |
| 693 | unsigned long p_offset; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 694 | unsigned int type; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 695 | int len, page_dirty; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 696 | int count = 0, done = 0, uptodate = 1; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 697 | xfs_off_t offset = page_offset(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 699 | if (page->index != tindex) |
| 700 | goto fail; |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 701 | if (!trylock_page(page)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 702 | goto fail; |
| 703 | if (PageWriteback(page)) |
| 704 | goto fail_unlock_page; |
| 705 | if (page->mapping != inode->i_mapping) |
| 706 | goto fail_unlock_page; |
Dave Chinner | 6ffc4db | 2012-04-23 15:58:43 +1000 | [diff] [blame] | 707 | if (!xfs_check_page_type(page, (*ioendp)->io_type)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 708 | goto fail_unlock_page; |
| 709 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 710 | /* |
| 711 | * page_dirty is initially a count of buffers on the page before |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 712 | * EOF and is decremented as we move each into a cleanable state. |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 713 | * |
| 714 | * Derivation: |
| 715 | * |
| 716 | * End offset is the highest offset that this page should represent. |
| 717 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) |
| 718 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and |
| 719 | * hence give us the correct page_dirty count. On any other page, |
| 720 | * it will be zero and in that case we need page_dirty to be the |
| 721 | * count of buffers on the page. |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 722 | */ |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 723 | end_offset = min_t(unsigned long long, |
| 724 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
| 725 | i_size_read(inode)); |
| 726 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 727 | len = 1 << inode->i_blkbits; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 728 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
| 729 | PAGE_CACHE_SIZE); |
| 730 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; |
| 731 | page_dirty = p_offset / len; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 732 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | bh = head = page_buffers(page); |
| 734 | do { |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 735 | if (offset >= end_offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | break; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 737 | if (!buffer_uptodate(bh)) |
| 738 | uptodate = 0; |
| 739 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { |
| 740 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | continue; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 742 | } |
| 743 | |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 744 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
| 745 | buffer_mapped(bh)) { |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 746 | if (buffer_unwritten(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 747 | type = XFS_IO_UNWRITTEN; |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 748 | else if (buffer_delay(bh)) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 749 | type = XFS_IO_DELALLOC; |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 750 | else |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 751 | type = XFS_IO_OVERWRITE; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 752 | |
Christoph Hellwig | 558e689 | 2010-04-28 12:28:58 +0000 | [diff] [blame] | 753 | if (!xfs_imap_valid(inode, imap, offset)) { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 754 | done = 1; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 755 | continue; |
| 756 | } |
| 757 | |
Christoph Hellwig | ecff71e | 2010-12-10 08:42:25 +0000 | [diff] [blame] | 758 | lock_buffer(bh); |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 759 | if (type != XFS_IO_OVERWRITE) |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 760 | xfs_map_at_offset(inode, bh, imap, offset); |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 761 | xfs_add_to_ioend(inode, bh, offset, type, |
| 762 | ioendp, done); |
| 763 | |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 764 | page_dirty--; |
| 765 | count++; |
| 766 | } else { |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 767 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 769 | } while (offset += len, (bh = bh->b_this_page) != head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 771 | if (uptodate && bh == head) |
| 772 | SetPageUptodate(page); |
| 773 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 774 | if (count) { |
Dave Chinner | efceab1 | 2010-08-24 11:44:56 +1000 | [diff] [blame] | 775 | if (--wbc->nr_to_write <= 0 && |
| 776 | wbc->sync_mode == WB_SYNC_NONE) |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 777 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | } |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 779 | xfs_start_page_writeback(page, !page_dirty, count); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 780 | |
| 781 | return done; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 782 | fail_unlock_page: |
| 783 | unlock_page(page); |
| 784 | fail: |
| 785 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | } |
| 787 | |
| 788 | /* |
| 789 | * Convert & write out a cluster of pages in the same extent as defined |
| 790 | * by mp and following the start page. |
| 791 | */ |
| 792 | STATIC void |
| 793 | xfs_cluster_write( |
| 794 | struct inode *inode, |
| 795 | pgoff_t tindex, |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 796 | struct xfs_bmbt_irec *imap, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 797 | xfs_ioend_t **ioendp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | struct writeback_control *wbc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | pgoff_t tlast) |
| 800 | { |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 801 | struct pagevec pvec; |
| 802 | int done = 0, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 804 | pagevec_init(&pvec, 0); |
| 805 | while (!done && tindex <= tlast) { |
| 806 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); |
| 807 | |
| 808 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | break; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 810 | |
| 811 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 812 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 813 | imap, ioendp, wbc); |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 814 | if (done) |
| 815 | break; |
| 816 | } |
| 817 | |
| 818 | pagevec_release(&pvec); |
| 819 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
| 821 | } |
| 822 | |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 823 | STATIC void |
| 824 | xfs_vm_invalidatepage( |
| 825 | struct page *page, |
| 826 | unsigned long offset) |
| 827 | { |
| 828 | trace_xfs_invalidatepage(page->mapping->host, page, offset); |
| 829 | block_invalidatepage(page, offset); |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | * If the page has delalloc buffers on it, we need to punch them out before we |
| 834 | * invalidate the page. If we don't, we leave a stale delalloc mapping on the |
| 835 | * inode that can trip a BUG() in xfs_get_blocks() later on if a direct IO read |
| 836 | * is done on that same region - the delalloc extent is returned when none is |
| 837 | * supposed to be there. |
| 838 | * |
| 839 | * We prevent this by truncating away the delalloc regions on the page before |
| 840 | * invalidating it. Because they are delalloc, we can do this without needing a |
| 841 | * transaction. Indeed - if we get ENOSPC errors, we have to be able to do this |
| 842 | * truncation without a transaction as there is no space left for block |
| 843 | * reservation (typically why we see a ENOSPC in writeback). |
| 844 | * |
| 845 | * This is not a performance critical path, so for now just do the punching a |
| 846 | * buffer head at a time. |
| 847 | */ |
| 848 | STATIC void |
| 849 | xfs_aops_discard_page( |
| 850 | struct page *page) |
| 851 | { |
| 852 | struct inode *inode = page->mapping->host; |
| 853 | struct xfs_inode *ip = XFS_I(inode); |
| 854 | struct buffer_head *bh, *head; |
| 855 | loff_t offset = page_offset(page); |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 856 | |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 857 | if (!xfs_check_page_type(page, XFS_IO_DELALLOC)) |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 858 | goto out_invalidate; |
| 859 | |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 860 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 861 | goto out_invalidate; |
| 862 | |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 863 | xfs_alert(ip->i_mount, |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 864 | "page discard on page %p, inode 0x%llx, offset %llu.", |
| 865 | page, ip->i_ino, offset); |
| 866 | |
| 867 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 868 | bh = head = page_buffers(page); |
| 869 | do { |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 870 | int error; |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 871 | xfs_fileoff_t start_fsb; |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 872 | |
| 873 | if (!buffer_delay(bh)) |
| 874 | goto next_buffer; |
| 875 | |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 876 | start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); |
| 877 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1); |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 878 | if (error) { |
| 879 | /* something screwed, just bail */ |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 880 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 881 | xfs_alert(ip->i_mount, |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 882 | "page discard unable to remove delalloc mapping."); |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 883 | } |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 884 | break; |
| 885 | } |
| 886 | next_buffer: |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 887 | offset += 1 << inode->i_blkbits; |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 888 | |
| 889 | } while ((bh = bh->b_this_page) != head); |
| 890 | |
| 891 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 892 | out_invalidate: |
| 893 | xfs_vm_invalidatepage(page, 0); |
| 894 | return; |
| 895 | } |
| 896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | /* |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 898 | * Write out a dirty page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | * |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 900 | * For delalloc space on the page we need to allocate space and flush it. |
| 901 | * For unwritten space on the page we need to start the conversion to |
| 902 | * regular allocated space. |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 903 | * 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] | 904 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | STATIC int |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 906 | xfs_vm_writepage( |
| 907 | struct page *page, |
| 908 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | { |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 910 | struct inode *inode = page->mapping->host; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 911 | struct buffer_head *bh, *head; |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 912 | struct xfs_bmbt_irec imap; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 913 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | loff_t offset; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 915 | unsigned int type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | __uint64_t end_offset; |
Christoph Hellwig | bd1556a | 2010-04-28 12:29:00 +0000 | [diff] [blame] | 917 | pgoff_t end_index, last_index; |
Christoph Hellwig | ed1e7b7 | 2010-12-10 08:42:22 +0000 | [diff] [blame] | 918 | ssize_t len; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 919 | int err, imap_valid = 0, uptodate = 1; |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 920 | int count = 0; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 921 | int nonblocking = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 923 | trace_xfs_writepage(inode, page, 0); |
| 924 | |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 925 | ASSERT(page_has_buffers(page)); |
| 926 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 927 | /* |
| 928 | * Refuse to write the page out if we are called from reclaim context. |
| 929 | * |
Christoph Hellwig | d4f7a5c | 2010-06-28 10:34:44 -0400 | [diff] [blame] | 930 | * This avoids stack overflows when called from deeply used stacks in |
| 931 | * random callers for direct reclaim or memcg reclaim. We explicitly |
| 932 | * allow reclaim from kswapd as the stack usage there is relatively low. |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 933 | * |
Mel Gorman | 94054fa | 2011-10-31 17:07:45 -0700 | [diff] [blame] | 934 | * This should never happen except in the case of a VM regression so |
| 935 | * warn about it. |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 936 | */ |
Mel Gorman | 94054fa | 2011-10-31 17:07:45 -0700 | [diff] [blame] | 937 | if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == |
| 938 | PF_MEMALLOC)) |
Christoph Hellwig | b5420f2 | 2010-08-24 11:47:51 +1000 | [diff] [blame] | 939 | goto redirty; |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 940 | |
| 941 | /* |
Christoph Hellwig | 680a647 | 2011-07-08 14:34:05 +0200 | [diff] [blame] | 942 | * Given that we do not allow direct reclaim to call us, we should |
| 943 | * never be called while in a filesystem transaction. |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 944 | */ |
Christoph Hellwig | 680a647 | 2011-07-08 14:34:05 +0200 | [diff] [blame] | 945 | if (WARN_ON(current->flags & PF_FSTRANS)) |
Christoph Hellwig | b5420f2 | 2010-08-24 11:47:51 +1000 | [diff] [blame] | 946 | goto redirty; |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 947 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | /* Is this page beyond the end of the file? */ |
| 949 | offset = i_size_read(inode); |
| 950 | end_index = offset >> PAGE_CACHE_SHIFT; |
| 951 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; |
| 952 | if (page->index >= end_index) { |
Christoph Hellwig | 6b7a03f | 2012-07-03 12:20:00 -0400 | [diff] [blame] | 953 | unsigned offset_into_page = offset & (PAGE_CACHE_SIZE - 1); |
| 954 | |
| 955 | /* |
| 956 | * Just skip the page if it is fully outside i_size, e.g. due |
| 957 | * to a truncate operation that is in progress. |
| 958 | */ |
| 959 | if (page->index >= end_index + 1 || offset_into_page == 0) { |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 960 | unlock_page(page); |
Nathan Scott | 19d5bcf | 2005-11-02 15:14:09 +1100 | [diff] [blame] | 961 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | } |
Christoph Hellwig | 6b7a03f | 2012-07-03 12:20:00 -0400 | [diff] [blame] | 963 | |
| 964 | /* |
| 965 | * The page straddles i_size. It must be zeroed out on each |
| 966 | * and every writepage invocation because it may be mmapped. |
| 967 | * "A file is mapped in multiples of the page size. For a file |
| 968 | * that is not a multiple of the page size, the remaining |
| 969 | * memory is zeroed when mapped, and writes to that region are |
| 970 | * not written out to the file." |
| 971 | */ |
| 972 | zero_user_segment(page, offset_into_page, PAGE_CACHE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | } |
| 974 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 975 | end_offset = min_t(unsigned long long, |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 976 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
| 977 | offset); |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 978 | len = 1 << inode->i_blkbits; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 979 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 980 | bh = head = page_buffers(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 981 | offset = page_offset(page); |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 982 | type = XFS_IO_OVERWRITE; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 983 | |
Christoph Hellwig | dbcdde3 | 2011-07-08 14:34:14 +0200 | [diff] [blame] | 984 | if (wbc->sync_mode == WB_SYNC_NONE) |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 985 | nonblocking = 1; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 986 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | do { |
Christoph Hellwig | 6ac7248 | 2010-12-10 08:42:18 +0000 | [diff] [blame] | 988 | int new_ioend = 0; |
| 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | if (offset >= end_offset) |
| 991 | break; |
| 992 | if (!buffer_uptodate(bh)) |
| 993 | uptodate = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | |
Eric Sandeen | 3d9b02e | 2010-06-24 09:45:30 +1000 | [diff] [blame] | 995 | /* |
Christoph Hellwig | ece413f | 2010-11-10 21:39:11 +0000 | [diff] [blame] | 996 | * set_page_dirty dirties all buffers in a page, independent |
| 997 | * of their state. The dirty state however is entirely |
| 998 | * meaningless for holes (!mapped && uptodate), so skip |
| 999 | * buffers covering holes here. |
Eric Sandeen | 3d9b02e | 2010-06-24 09:45:30 +1000 | [diff] [blame] | 1000 | */ |
| 1001 | if (!buffer_mapped(bh) && buffer_uptodate(bh)) { |
Eric Sandeen | 3d9b02e | 2010-06-24 09:45:30 +1000 | [diff] [blame] | 1002 | imap_valid = 0; |
| 1003 | continue; |
| 1004 | } |
| 1005 | |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1006 | if (buffer_unwritten(bh)) { |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1007 | if (type != XFS_IO_UNWRITTEN) { |
| 1008 | type = XFS_IO_UNWRITTEN; |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1009 | imap_valid = 0; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1010 | } |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1011 | } else if (buffer_delay(bh)) { |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1012 | if (type != XFS_IO_DELALLOC) { |
| 1013 | type = XFS_IO_DELALLOC; |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1014 | imap_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | } |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1016 | } else if (buffer_uptodate(bh)) { |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1017 | if (type != XFS_IO_OVERWRITE) { |
| 1018 | type = XFS_IO_OVERWRITE; |
Christoph Hellwig | 85da94c | 2010-12-10 08:42:16 +0000 | [diff] [blame] | 1019 | imap_valid = 0; |
| 1020 | } |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1021 | } else { |
Alain Renaud | 7d0fa3e | 2012-06-08 15:34:46 -0400 | [diff] [blame] | 1022 | if (PageUptodate(page)) |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1023 | ASSERT(buffer_mapped(bh)); |
Alain Renaud | 7d0fa3e | 2012-06-08 15:34:46 -0400 | [diff] [blame] | 1024 | /* |
| 1025 | * This buffer is not uptodate and will not be |
| 1026 | * written to disk. Ensure that we will put any |
| 1027 | * subsequent writeable buffers into a new |
| 1028 | * ioend. |
| 1029 | */ |
| 1030 | imap_valid = 0; |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1031 | continue; |
| 1032 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1034 | if (imap_valid) |
| 1035 | imap_valid = xfs_imap_valid(inode, &imap, offset); |
| 1036 | if (!imap_valid) { |
| 1037 | /* |
| 1038 | * If we didn't have a valid mapping then we need to |
| 1039 | * put the new mapping into a separate ioend structure. |
| 1040 | * This ensures non-contiguous extents always have |
| 1041 | * separate ioends, which is particularly important |
| 1042 | * for unwritten extent conversion at I/O completion |
| 1043 | * time. |
| 1044 | */ |
| 1045 | new_ioend = 1; |
| 1046 | err = xfs_map_blocks(inode, offset, &imap, type, |
| 1047 | nonblocking); |
| 1048 | if (err) |
| 1049 | goto error; |
| 1050 | imap_valid = xfs_imap_valid(inode, &imap, offset); |
| 1051 | } |
| 1052 | if (imap_valid) { |
Christoph Hellwig | ecff71e | 2010-12-10 08:42:25 +0000 | [diff] [blame] | 1053 | lock_buffer(bh); |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1054 | if (type != XFS_IO_OVERWRITE) |
Christoph Hellwig | aeea1b1 | 2010-12-10 08:42:24 +0000 | [diff] [blame] | 1055 | xfs_map_at_offset(inode, bh, &imap, offset); |
| 1056 | xfs_add_to_ioend(inode, bh, offset, type, &ioend, |
| 1057 | new_ioend); |
| 1058 | count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | } |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1060 | |
| 1061 | if (!iohead) |
| 1062 | iohead = ioend; |
| 1063 | |
| 1064 | } while (offset += len, ((bh = bh->b_this_page) != head)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
| 1066 | if (uptodate && bh == head) |
| 1067 | SetPageUptodate(page); |
| 1068 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1069 | xfs_start_page_writeback(page, 1, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 1071 | /* if there is no IO to be submitted for this page, we are done */ |
| 1072 | if (!ioend) |
| 1073 | return 0; |
| 1074 | |
| 1075 | ASSERT(iohead); |
| 1076 | |
| 1077 | /* |
| 1078 | * Any errors from this point onwards need tobe reported through the IO |
| 1079 | * completion path as we have marked the initial page as under writeback |
| 1080 | * and unlocked it. |
| 1081 | */ |
| 1082 | if (imap_valid) { |
Christoph Hellwig | bd1556a | 2010-04-28 12:29:00 +0000 | [diff] [blame] | 1083 | xfs_off_t end_index; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame] | 1084 | |
Christoph Hellwig | bd1556a | 2010-04-28 12:29:00 +0000 | [diff] [blame] | 1085 | end_index = imap.br_startoff + imap.br_blockcount; |
| 1086 | |
| 1087 | /* to bytes */ |
| 1088 | end_index <<= inode->i_blkbits; |
| 1089 | |
| 1090 | /* to pages */ |
| 1091 | end_index = (end_index - 1) >> PAGE_CACHE_SHIFT; |
| 1092 | |
| 1093 | /* check against file size */ |
| 1094 | if (end_index > last_index) |
| 1095 | end_index = last_index; |
| 1096 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1097 | xfs_cluster_write(inode, page->index + 1, &imap, &ioend, |
Christoph Hellwig | 2fa24f9 | 2010-12-10 08:42:23 +0000 | [diff] [blame] | 1098 | wbc, end_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | } |
| 1100 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1101 | |
Dave Chinner | 7bf7f35 | 2012-11-12 22:09:45 +1100 | [diff] [blame] | 1102 | /* |
| 1103 | * Reserve log space if we might write beyond the on-disk inode size. |
| 1104 | */ |
| 1105 | err = 0; |
| 1106 | if (ioend->io_type != XFS_IO_UNWRITTEN && xfs_ioend_is_append(ioend)) |
| 1107 | err = xfs_setfilesize_trans_alloc(ioend); |
| 1108 | |
| 1109 | xfs_submit_ioend(wbc, iohead, err); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1110 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1111 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
| 1113 | error: |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1114 | if (iohead) |
| 1115 | xfs_cancel_ioend(iohead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | |
Christoph Hellwig | b5420f2 | 2010-08-24 11:47:51 +1000 | [diff] [blame] | 1117 | if (err == -EAGAIN) |
| 1118 | goto redirty; |
| 1119 | |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 1120 | xfs_aops_discard_page(page); |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1121 | ClearPageUptodate(page); |
| 1122 | unlock_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | return err; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1124 | |
Christoph Hellwig | b5420f2 | 2010-08-24 11:47:51 +1000 | [diff] [blame] | 1125 | redirty: |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1126 | redirty_page_for_writepage(wbc, page); |
| 1127 | unlock_page(page); |
| 1128 | return 0; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1129 | } |
| 1130 | |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1131 | STATIC int |
| 1132 | xfs_vm_writepages( |
| 1133 | struct address_space *mapping, |
| 1134 | struct writeback_control *wbc) |
| 1135 | { |
Christoph Hellwig | b3aea4e | 2007-08-29 11:44:37 +1000 | [diff] [blame] | 1136 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1137 | return generic_writepages(mapping, wbc); |
| 1138 | } |
| 1139 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1140 | /* |
| 1141 | * Called to move a page into cleanable state - and from there |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1142 | * to be released. The page should already be clean. We always |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1143 | * have buffer heads in this call. |
| 1144 | * |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1145 | * Returns 1 if the page is ok to release, 0 otherwise. |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1146 | */ |
| 1147 | STATIC int |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1148 | xfs_vm_releasepage( |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1149 | struct page *page, |
| 1150 | gfp_t gfp_mask) |
| 1151 | { |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 1152 | int delalloc, unwritten; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1153 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1154 | trace_xfs_releasepage(page->mapping->host, page, 0); |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1155 | |
Christoph Hellwig | 20cb52e | 2010-06-24 09:46:01 +1000 | [diff] [blame] | 1156 | xfs_count_page_state(page, &delalloc, &unwritten); |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1157 | |
Christoph Hellwig | 89f3b363 | 2010-06-24 09:45:48 +1000 | [diff] [blame] | 1158 | if (WARN_ON(delalloc)) |
| 1159 | return 0; |
| 1160 | if (WARN_ON(unwritten)) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1161 | return 0; |
| 1162 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1163 | return try_to_free_buffers(page); |
| 1164 | } |
| 1165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | STATIC int |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1167 | __xfs_get_blocks( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | struct inode *inode, |
| 1169 | sector_t iblock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | struct buffer_head *bh_result, |
| 1171 | int create, |
Christoph Hellwig | f2bde9b | 2010-06-24 11:44:35 +1000 | [diff] [blame] | 1172 | int direct) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | { |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1174 | struct xfs_inode *ip = XFS_I(inode); |
| 1175 | struct xfs_mount *mp = ip->i_mount; |
| 1176 | xfs_fileoff_t offset_fsb, end_fsb; |
| 1177 | int error = 0; |
| 1178 | int lockmode = 0; |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1179 | struct xfs_bmbt_irec imap; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1180 | int nimaps = 1; |
Nathan Scott | fdc7ed7 | 2005-11-02 15:13:13 +1100 | [diff] [blame] | 1181 | xfs_off_t offset; |
| 1182 | ssize_t size; |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1183 | int new = 0; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1184 | |
| 1185 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 1186 | return -XFS_ERROR(EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
Nathan Scott | fdc7ed7 | 2005-11-02 15:13:13 +1100 | [diff] [blame] | 1188 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1189 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
| 1190 | size = bh_result->b_size; |
Lachlan McIlroy | 364f358 | 2008-09-17 16:50:14 +1000 | [diff] [blame] | 1191 | |
| 1192 | if (!create && direct && offset >= i_size_read(inode)) |
| 1193 | return 0; |
| 1194 | |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1195 | /* |
| 1196 | * Direct I/O is usually done on preallocated files, so try getting |
| 1197 | * a block mapping without an exclusive lock first. For buffered |
| 1198 | * writes we already have the exclusive iolock anyway, so avoiding |
| 1199 | * a lock roundtrip here by taking the ilock exclusive from the |
| 1200 | * beginning is a useful micro optimization. |
| 1201 | */ |
| 1202 | if (create && !direct) { |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1203 | lockmode = XFS_ILOCK_EXCL; |
| 1204 | xfs_ilock(ip, lockmode); |
| 1205 | } else { |
| 1206 | lockmode = xfs_ilock_map_shared(ip); |
| 1207 | } |
Christoph Hellwig | f2bde9b | 2010-06-24 11:44:35 +1000 | [diff] [blame] | 1208 | |
Dave Chinner | d2c2819 | 2012-06-08 15:44:53 +1000 | [diff] [blame] | 1209 | ASSERT(offset <= mp->m_super->s_maxbytes); |
| 1210 | if (offset + size > mp->m_super->s_maxbytes) |
| 1211 | size = mp->m_super->s_maxbytes - offset; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1212 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); |
| 1213 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
| 1214 | |
Dave Chinner | 5c8ed20 | 2011-09-18 20:40:45 +0000 | [diff] [blame] | 1215 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
| 1216 | &imap, &nimaps, XFS_BMAPI_ENTIRE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | if (error) |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1218 | goto out_unlock; |
| 1219 | |
| 1220 | if (create && |
| 1221 | (!nimaps || |
| 1222 | (imap.br_startblock == HOLESTARTBLOCK || |
| 1223 | imap.br_startblock == DELAYSTARTBLOCK))) { |
Dave Chinner | aff3a9e | 2012-04-23 15:58:44 +1000 | [diff] [blame] | 1224 | if (direct || xfs_get_extsz_hint(ip)) { |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1225 | /* |
| 1226 | * Drop the ilock in preparation for starting the block |
| 1227 | * allocation transaction. It will be retaken |
| 1228 | * exclusively inside xfs_iomap_write_direct for the |
| 1229 | * actual allocation. |
| 1230 | */ |
| 1231 | xfs_iunlock(ip, lockmode); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1232 | error = xfs_iomap_write_direct(ip, offset, size, |
| 1233 | &imap, nimaps); |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1234 | if (error) |
| 1235 | return -error; |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1236 | new = 1; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1237 | } else { |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1238 | /* |
| 1239 | * Delalloc reservations do not require a transaction, |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1240 | * we can go on without dropping the lock here. If we |
| 1241 | * are allocating a new delalloc block, make sure that |
| 1242 | * we set the new flag so that we mark the buffer new so |
| 1243 | * that we know that it is newly allocated if the write |
| 1244 | * fails. |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1245 | */ |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1246 | if (nimaps && imap.br_startblock == HOLESTARTBLOCK) |
| 1247 | new = 1; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1248 | error = xfs_iomap_write_delay(ip, offset, size, &imap); |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1249 | if (error) |
| 1250 | goto out_unlock; |
| 1251 | |
| 1252 | xfs_iunlock(ip, lockmode); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1253 | } |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1254 | |
| 1255 | trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap); |
| 1256 | } else if (nimaps) { |
| 1257 | trace_xfs_get_blocks_found(ip, offset, size, 0, &imap); |
Dave Chinner | 507630b | 2012-03-27 10:34:50 -0400 | [diff] [blame] | 1258 | xfs_iunlock(ip, lockmode); |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1259 | } else { |
| 1260 | trace_xfs_get_blocks_notfound(ip, offset, size); |
| 1261 | goto out_unlock; |
| 1262 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1264 | if (imap.br_startblock != HOLESTARTBLOCK && |
| 1265 | imap.br_startblock != DELAYSTARTBLOCK) { |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 1266 | /* |
| 1267 | * For unwritten extents do not report a disk address on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | * the read case (treat as if we're reading into a hole). |
| 1269 | */ |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1270 | if (create || !ISUNWRITTEN(&imap)) |
| 1271 | xfs_map_buffer(inode, bh_result, &imap, offset); |
| 1272 | if (create && ISUNWRITTEN(&imap)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | if (direct) |
| 1274 | bh_result->b_private = inode; |
| 1275 | set_buffer_unwritten(bh_result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | } |
| 1277 | } |
| 1278 | |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1279 | /* |
| 1280 | * If this is a realtime file, data may be on a different device. |
| 1281 | * to that pointed to from the buffer_head b_bdev currently. |
| 1282 | */ |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 1283 | bh_result->b_bdev = xfs_find_bdev_for_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1285 | /* |
David Chinner | 549054a | 2007-02-10 18:36:35 +1100 | [diff] [blame] | 1286 | * If we previously allocated a block out beyond eof and we are now |
| 1287 | * coming back to use it then we will need to flag it as new even if it |
| 1288 | * has a disk address. |
| 1289 | * |
| 1290 | * With sub-block writes into unwritten extents we also need to mark |
| 1291 | * the buffer as new so that the unwritten parts of the buffer gets |
| 1292 | * correctly zeroed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | */ |
| 1294 | if (create && |
| 1295 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || |
David Chinner | 549054a | 2007-02-10 18:36:35 +1100 | [diff] [blame] | 1296 | (offset >= i_size_read(inode)) || |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1297 | (new || ISUNWRITTEN(&imap)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | set_buffer_new(bh_result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
Christoph Hellwig | 207d041 | 2010-04-28 12:28:56 +0000 | [diff] [blame] | 1300 | if (imap.br_startblock == DELAYSTARTBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | BUG_ON(direct); |
| 1302 | if (create) { |
| 1303 | set_buffer_uptodate(bh_result); |
| 1304 | set_buffer_mapped(bh_result); |
| 1305 | set_buffer_delay(bh_result); |
| 1306 | } |
| 1307 | } |
| 1308 | |
Christoph Hellwig | 2b8f12b | 2010-04-28 12:28:59 +0000 | [diff] [blame] | 1309 | /* |
| 1310 | * If this is O_DIRECT or the mpage code calling tell them how large |
| 1311 | * the mapping is, so that we can avoid repeated get_blocks calls. |
| 1312 | */ |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1313 | if (direct || size > (1 << inode->i_blkbits)) { |
Christoph Hellwig | 2b8f12b | 2010-04-28 12:28:59 +0000 | [diff] [blame] | 1314 | xfs_off_t mapping_size; |
Christoph Hellwig | 9563b3d | 2010-04-28 12:28:53 +0000 | [diff] [blame] | 1315 | |
Christoph Hellwig | 2b8f12b | 2010-04-28 12:28:59 +0000 | [diff] [blame] | 1316 | mapping_size = imap.br_startoff + imap.br_blockcount - iblock; |
| 1317 | mapping_size <<= inode->i_blkbits; |
| 1318 | |
| 1319 | ASSERT(mapping_size > 0); |
| 1320 | if (mapping_size > size) |
| 1321 | mapping_size = size; |
| 1322 | if (mapping_size > LONG_MAX) |
| 1323 | mapping_size = LONG_MAX; |
| 1324 | |
| 1325 | bh_result->b_size = mapping_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | } |
| 1327 | |
| 1328 | return 0; |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 1329 | |
| 1330 | out_unlock: |
| 1331 | xfs_iunlock(ip, lockmode); |
| 1332 | return -error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | } |
| 1334 | |
| 1335 | int |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1336 | xfs_get_blocks( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | struct inode *inode, |
| 1338 | sector_t iblock, |
| 1339 | struct buffer_head *bh_result, |
| 1340 | int create) |
| 1341 | { |
Christoph Hellwig | f2bde9b | 2010-06-24 11:44:35 +1000 | [diff] [blame] | 1342 | return __xfs_get_blocks(inode, iblock, bh_result, create, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | } |
| 1344 | |
| 1345 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1346 | xfs_get_blocks_direct( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | struct inode *inode, |
| 1348 | sector_t iblock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | struct buffer_head *bh_result, |
| 1350 | int create) |
| 1351 | { |
Christoph Hellwig | f2bde9b | 2010-06-24 11:44:35 +1000 | [diff] [blame] | 1352 | return __xfs_get_blocks(inode, iblock, bh_result, create, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | } |
| 1354 | |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1355 | /* |
| 1356 | * Complete a direct I/O write request. |
| 1357 | * |
| 1358 | * If the private argument is non-NULL __xfs_get_blocks signals us that we |
| 1359 | * need to issue a transaction to convert the range from unwritten to written |
| 1360 | * 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] | 1361 | * 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] | 1362 | * request this handler is called from interrupt context, from which we |
| 1363 | * can't start transactions. In that case offload the I/O completion to |
| 1364 | * the workqueues we also use for buffered I/O completion. |
| 1365 | */ |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1366 | STATIC void |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1367 | xfs_end_io_direct_write( |
| 1368 | struct kiocb *iocb, |
| 1369 | loff_t offset, |
| 1370 | ssize_t size, |
| 1371 | void *private, |
| 1372 | int ret, |
| 1373 | bool is_async) |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1374 | { |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1375 | struct xfs_ioend *ioend = iocb->private; |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1376 | |
| 1377 | /* |
Christoph Hellwig | 2813d68 | 2011-12-18 20:00:12 +0000 | [diff] [blame] | 1378 | * While the generic direct I/O code updates the inode size, it does |
| 1379 | * so only after the end_io handler is called, which means our |
| 1380 | * end_io handler thinks the on-disk size is outside the in-core |
| 1381 | * size. To prevent this just update it a little bit earlier here. |
| 1382 | */ |
| 1383 | if (offset + size > i_size_read(ioend->io_inode)) |
| 1384 | i_size_write(ioend->io_inode, offset + size); |
| 1385 | |
| 1386 | /* |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 1387 | * blockdev_direct_IO can return an error even after the I/O |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1388 | * completion handler was called. Thus we need to protect |
| 1389 | * against double-freeing. |
| 1390 | */ |
| 1391 | iocb->private = NULL; |
Christoph Hellwig | 40e2e97 | 2010-07-18 21:17:09 +0000 | [diff] [blame] | 1392 | |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1393 | ioend->io_offset = offset; |
| 1394 | ioend->io_size = size; |
Christoph Hellwig | c859cdd | 2011-08-23 08:28:10 +0000 | [diff] [blame] | 1395 | ioend->io_iocb = iocb; |
| 1396 | ioend->io_result = ret; |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1397 | if (private && size > 0) |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1398 | ioend->io_type = XFS_IO_UNWRITTEN; |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1399 | |
| 1400 | if (is_async) { |
Christoph Hellwig | c859cdd | 2011-08-23 08:28:10 +0000 | [diff] [blame] | 1401 | ioend->io_isasync = 1; |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1402 | xfs_finish_ioend(ioend); |
| 1403 | } else { |
| 1404 | xfs_finish_ioend_sync(ioend); |
| 1405 | } |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1406 | } |
| 1407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | STATIC ssize_t |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1409 | xfs_vm_direct_IO( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | int rw, |
| 1411 | struct kiocb *iocb, |
| 1412 | const struct iovec *iov, |
| 1413 | loff_t offset, |
| 1414 | unsigned long nr_segs) |
| 1415 | { |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1416 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
| 1417 | struct block_device *bdev = xfs_find_bdev_for_inode(inode); |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1418 | struct xfs_ioend *ioend = NULL; |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1419 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1421 | if (rw & WRITE) { |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1422 | size_t size = iov_length(iov, nr_segs); |
| 1423 | |
| 1424 | /* |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 1425 | * We cannot preallocate a size update transaction here as we |
| 1426 | * don't know whether allocation is necessary or not. Hence we |
| 1427 | * can only tell IO completion that one is necessary if we are |
| 1428 | * not doing unwritten extent conversion. |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1429 | */ |
Alain Renaud | 0d882a3 | 2012-05-22 15:56:21 -0500 | [diff] [blame] | 1430 | iocb->private = ioend = xfs_alloc_ioend(inode, XFS_IO_DIRECT); |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 1431 | if (offset + size > XFS_I(inode)->i_d.di_size) |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1432 | ioend->io_isdirect = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 1434 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
| 1435 | offset, nr_segs, |
| 1436 | xfs_get_blocks_direct, |
| 1437 | xfs_end_io_direct_write, NULL, 0); |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1438 | if (ret != -EIOCBQUEUED && iocb->private) |
Dave Chinner | 437a255 | 2012-11-28 13:01:00 +1100 | [diff] [blame] | 1439 | goto out_destroy_ioend; |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1440 | } else { |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 1441 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
| 1442 | offset, nr_segs, |
| 1443 | xfs_get_blocks_direct, |
| 1444 | NULL, NULL, 0); |
Christoph Hellwig | 209fb87 | 2010-07-18 21:17:11 +0000 | [diff] [blame] | 1445 | } |
Christoph Hellwig | 5fe878ae | 2009-12-15 16:47:50 -0800 | [diff] [blame] | 1446 | |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1447 | return ret; |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1448 | |
Christoph Hellwig | 281627d | 2012-03-13 08:41:05 +0000 | [diff] [blame] | 1449 | out_destroy_ioend: |
| 1450 | xfs_destroy_ioend(ioend); |
| 1451 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1454 | /* |
| 1455 | * Punch out the delalloc blocks we have already allocated. |
| 1456 | * |
| 1457 | * Don't bother with xfs_setattr given that nothing can have made it to disk yet |
| 1458 | * as the page is still locked at this point. |
| 1459 | */ |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1460 | STATIC void |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1461 | xfs_vm_kill_delalloc_range( |
| 1462 | struct inode *inode, |
| 1463 | loff_t start, |
| 1464 | loff_t end) |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1465 | { |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1466 | struct xfs_inode *ip = XFS_I(inode); |
| 1467 | xfs_fileoff_t start_fsb; |
| 1468 | xfs_fileoff_t end_fsb; |
| 1469 | int error; |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1470 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1471 | start_fsb = XFS_B_TO_FSB(ip->i_mount, start); |
| 1472 | end_fsb = XFS_B_TO_FSB(ip->i_mount, end); |
| 1473 | if (end_fsb <= start_fsb) |
| 1474 | return; |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 1475 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1476 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 1477 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, |
| 1478 | end_fsb - start_fsb); |
| 1479 | if (error) { |
| 1480 | /* something screwed, just bail */ |
| 1481 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
| 1482 | xfs_alert(ip->i_mount, |
| 1483 | "xfs_vm_write_failed: unable to clean up ino %lld", |
| 1484 | ip->i_ino); |
Dave Chinner | c726de4 | 2010-11-30 15:14:39 +1100 | [diff] [blame] | 1485 | } |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1486 | } |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1487 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1488 | } |
| 1489 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1490 | STATIC void |
| 1491 | xfs_vm_write_failed( |
| 1492 | struct inode *inode, |
| 1493 | struct page *page, |
| 1494 | loff_t pos, |
| 1495 | unsigned len) |
| 1496 | { |
| 1497 | loff_t block_offset = pos & PAGE_MASK; |
| 1498 | loff_t block_start; |
| 1499 | loff_t block_end; |
| 1500 | loff_t from = pos & (PAGE_CACHE_SIZE - 1); |
| 1501 | loff_t to = from + len; |
| 1502 | struct buffer_head *bh, *head; |
| 1503 | |
| 1504 | ASSERT(block_offset + from == pos); |
| 1505 | |
| 1506 | head = page_buffers(page); |
| 1507 | block_start = 0; |
| 1508 | for (bh = head; bh != head || !block_start; |
| 1509 | bh = bh->b_this_page, block_start = block_end, |
| 1510 | block_offset += bh->b_size) { |
| 1511 | block_end = block_start + bh->b_size; |
| 1512 | |
| 1513 | /* skip buffers before the write */ |
| 1514 | if (block_end <= from) |
| 1515 | continue; |
| 1516 | |
| 1517 | /* if the buffer is after the write, we're done */ |
| 1518 | if (block_start >= to) |
| 1519 | break; |
| 1520 | |
| 1521 | if (!buffer_delay(bh)) |
| 1522 | continue; |
| 1523 | |
| 1524 | if (!buffer_new(bh) && block_offset < i_size_read(inode)) |
| 1525 | continue; |
| 1526 | |
| 1527 | xfs_vm_kill_delalloc_range(inode, block_offset, |
| 1528 | block_offset + bh->b_size); |
| 1529 | } |
| 1530 | |
| 1531 | } |
| 1532 | |
| 1533 | /* |
| 1534 | * This used to call block_write_begin(), but it unlocks and releases the page |
| 1535 | * on error, and we need that page to be able to punch stale delalloc blocks out |
| 1536 | * on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at |
| 1537 | * the appropriate point. |
| 1538 | */ |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1539 | STATIC int |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1540 | xfs_vm_write_begin( |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1541 | struct file *file, |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1542 | struct address_space *mapping, |
| 1543 | loff_t pos, |
| 1544 | unsigned len, |
| 1545 | unsigned flags, |
| 1546 | struct page **pagep, |
| 1547 | void **fsdata) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1548 | { |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1549 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
| 1550 | struct page *page; |
| 1551 | int status; |
Christoph Hellwig | 155130a | 2010-06-04 11:29:58 +0200 | [diff] [blame] | 1552 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1553 | ASSERT(len <= PAGE_CACHE_SIZE); |
| 1554 | |
| 1555 | page = grab_cache_page_write_begin(mapping, index, |
| 1556 | flags | AOP_FLAG_NOFS); |
| 1557 | if (!page) |
| 1558 | return -ENOMEM; |
| 1559 | |
| 1560 | status = __block_write_begin(page, pos, len, xfs_get_blocks); |
| 1561 | if (unlikely(status)) { |
| 1562 | struct inode *inode = mapping->host; |
| 1563 | |
| 1564 | xfs_vm_write_failed(inode, page, pos, len); |
| 1565 | unlock_page(page); |
| 1566 | |
| 1567 | if (pos + len > i_size_read(inode)) |
| 1568 | truncate_pagecache(inode, pos + len, i_size_read(inode)); |
| 1569 | |
| 1570 | page_cache_release(page); |
| 1571 | page = NULL; |
| 1572 | } |
| 1573 | |
| 1574 | *pagep = page; |
| 1575 | return status; |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1576 | } |
Christoph Hellwig | 155130a | 2010-06-04 11:29:58 +0200 | [diff] [blame] | 1577 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1578 | /* |
| 1579 | * On failure, we only need to kill delalloc blocks beyond EOF because they |
| 1580 | * will never be written. For blocks within EOF, generic_write_end() zeros them |
| 1581 | * so they are safe to leave alone and be written with all the other valid data. |
| 1582 | */ |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1583 | STATIC int |
| 1584 | xfs_vm_write_end( |
| 1585 | struct file *file, |
| 1586 | struct address_space *mapping, |
| 1587 | loff_t pos, |
| 1588 | unsigned len, |
| 1589 | unsigned copied, |
| 1590 | struct page *page, |
| 1591 | void *fsdata) |
| 1592 | { |
| 1593 | int ret; |
| 1594 | |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1595 | ASSERT(len <= PAGE_CACHE_SIZE); |
| 1596 | |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1597 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
Dave Chinner | d3bc815 | 2012-04-27 19:45:21 +1000 | [diff] [blame] | 1598 | if (unlikely(ret < len)) { |
| 1599 | struct inode *inode = mapping->host; |
| 1600 | size_t isize = i_size_read(inode); |
| 1601 | loff_t to = pos + len; |
| 1602 | |
| 1603 | if (to > isize) { |
| 1604 | truncate_pagecache(inode, to, isize); |
| 1605 | xfs_vm_kill_delalloc_range(inode, isize, to); |
| 1606 | } |
| 1607 | } |
Christoph Hellwig | 155130a | 2010-06-04 11:29:58 +0200 | [diff] [blame] | 1608 | return ret; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1609 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | |
| 1611 | STATIC sector_t |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1612 | xfs_vm_bmap( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | struct address_space *mapping, |
| 1614 | sector_t block) |
| 1615 | { |
| 1616 | struct inode *inode = (struct inode *)mapping->host; |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 1617 | struct xfs_inode *ip = XFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | |
Christoph Hellwig | cca28fb | 2010-06-24 11:57:09 +1000 | [diff] [blame] | 1619 | trace_xfs_vm_bmap(XFS_I(inode)); |
Christoph Hellwig | 126468b | 2008-03-06 13:44:57 +1100 | [diff] [blame] | 1620 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
Dave Chinner | 4bc1ea6 | 2012-11-12 22:53:56 +1100 | [diff] [blame] | 1621 | filemap_write_and_wait(mapping); |
Christoph Hellwig | 126468b | 2008-03-06 13:44:57 +1100 | [diff] [blame] | 1622 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1623 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | } |
| 1625 | |
| 1626 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1627 | xfs_vm_readpage( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | struct file *unused, |
| 1629 | struct page *page) |
| 1630 | { |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1631 | return mpage_readpage(page, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | } |
| 1633 | |
| 1634 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1635 | xfs_vm_readpages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | struct file *unused, |
| 1637 | struct address_space *mapping, |
| 1638 | struct list_head *pages, |
| 1639 | unsigned nr_pages) |
| 1640 | { |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1641 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | } |
| 1643 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1644 | const struct address_space_operations xfs_address_space_operations = { |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1645 | .readpage = xfs_vm_readpage, |
| 1646 | .readpages = xfs_vm_readpages, |
| 1647 | .writepage = xfs_vm_writepage, |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1648 | .writepages = xfs_vm_writepages, |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1649 | .releasepage = xfs_vm_releasepage, |
| 1650 | .invalidatepage = xfs_vm_invalidatepage, |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1651 | .write_begin = xfs_vm_write_begin, |
Christoph Hellwig | fa9b227 | 2010-06-14 05:17:31 -0400 | [diff] [blame] | 1652 | .write_end = xfs_vm_write_end, |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1653 | .bmap = xfs_vm_bmap, |
| 1654 | .direct_IO = xfs_vm_direct_IO, |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 1655 | .migratepage = buffer_migrate_page, |
Hisashi Hifumi | bddaafa | 2009-03-29 09:53:38 +0200 | [diff] [blame] | 1656 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1657 | .error_remove_page = generic_error_remove_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | }; |