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" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 19 | #include "xfs_bit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "xfs_log.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 21 | #include "xfs_inum.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include "xfs_sb.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 23 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "xfs_dir2.h" |
| 25 | #include "xfs_trans.h" |
| 26 | #include "xfs_dmapi.h" |
| 27 | #include "xfs_mount.h" |
| 28 | #include "xfs_bmap_btree.h" |
| 29 | #include "xfs_alloc_btree.h" |
| 30 | #include "xfs_ialloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "xfs_dir2_sf.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 32 | #include "xfs_attr_sf.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include "xfs_dinode.h" |
| 34 | #include "xfs_inode.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 35 | #include "xfs_alloc.h" |
| 36 | #include "xfs_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include "xfs_error.h" |
| 38 | #include "xfs_rw.h" |
| 39 | #include "xfs_iomap.h" |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 40 | #include "xfs_vnodeops.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 41 | #include "xfs_trace.h" |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 42 | #include "xfs_bmap.h" |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 43 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/mpage.h> |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 45 | #include <linux/pagevec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/writeback.h> |
| 47 | |
Christoph Hellwig | 25e41b3 | 2008-12-03 12:20:39 +0100 | [diff] [blame] | 48 | |
| 49 | /* |
| 50 | * Prime number of hash buckets since address is used as the key. |
| 51 | */ |
| 52 | #define NVSYNC 37 |
| 53 | #define to_ioend_wq(v) (&xfs_ioend_wq[((unsigned long)v) % NVSYNC]) |
| 54 | static wait_queue_head_t xfs_ioend_wq[NVSYNC]; |
| 55 | |
| 56 | void __init |
| 57 | xfs_ioend_init(void) |
| 58 | { |
| 59 | int i; |
| 60 | |
| 61 | for (i = 0; i < NVSYNC; i++) |
| 62 | init_waitqueue_head(&xfs_ioend_wq[i]); |
| 63 | } |
| 64 | |
| 65 | void |
| 66 | xfs_ioend_wait( |
| 67 | xfs_inode_t *ip) |
| 68 | { |
| 69 | wait_queue_head_t *wq = to_ioend_wq(ip); |
| 70 | |
| 71 | wait_event(*wq, (atomic_read(&ip->i_iocount) == 0)); |
| 72 | } |
| 73 | |
| 74 | STATIC void |
| 75 | xfs_ioend_wake( |
| 76 | xfs_inode_t *ip) |
| 77 | { |
| 78 | if (atomic_dec_and_test(&ip->i_iocount)) |
| 79 | wake_up(to_ioend_wq(ip)); |
| 80 | } |
| 81 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 82 | void |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 83 | xfs_count_page_state( |
| 84 | struct page *page, |
| 85 | int *delalloc, |
| 86 | int *unmapped, |
| 87 | int *unwritten) |
| 88 | { |
| 89 | struct buffer_head *bh, *head; |
| 90 | |
| 91 | *delalloc = *unmapped = *unwritten = 0; |
| 92 | |
| 93 | bh = head = page_buffers(page); |
| 94 | do { |
| 95 | if (buffer_uptodate(bh) && !buffer_mapped(bh)) |
| 96 | (*unmapped) = 1; |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 97 | else if (buffer_unwritten(bh)) |
| 98 | (*unwritten) = 1; |
| 99 | else if (buffer_delay(bh)) |
| 100 | (*delalloc) = 1; |
| 101 | } while ((bh = bh->b_this_page) != head); |
| 102 | } |
| 103 | |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 104 | STATIC struct block_device * |
| 105 | xfs_find_bdev_for_inode( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 106 | struct inode *inode) |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 107 | { |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 108 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 109 | struct xfs_mount *mp = ip->i_mount; |
| 110 | |
Eric Sandeen | 71ddabb | 2007-11-23 16:29:42 +1100 | [diff] [blame] | 111 | if (XFS_IS_REALTIME_INODE(ip)) |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 112 | return mp->m_rtdev_targp->bt_bdev; |
| 113 | else |
| 114 | return mp->m_ddev_targp->bt_bdev; |
| 115 | } |
| 116 | |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 117 | /* |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 118 | * We're now finished for good with this ioend structure. |
| 119 | * Update the page state via the associated buffer_heads, |
| 120 | * release holds on the inode and bio, and finally free |
| 121 | * up memory. Do not use the ioend after this. |
| 122 | */ |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 123 | STATIC void |
| 124 | xfs_destroy_ioend( |
| 125 | xfs_ioend_t *ioend) |
| 126 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 127 | struct buffer_head *bh, *next; |
Christoph Hellwig | 583fa58 | 2008-12-03 12:20:38 +0100 | [diff] [blame] | 128 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 129 | |
| 130 | for (bh = ioend->io_buffer_head; bh; bh = next) { |
| 131 | next = bh->b_private; |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 132 | bh->b_end_io(bh, !ioend->io_error); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 133 | } |
Christoph Hellwig | 583fa58 | 2008-12-03 12:20:38 +0100 | [diff] [blame] | 134 | |
| 135 | /* |
| 136 | * Volume managers supporting multiple paths can send back ENODEV |
| 137 | * when the final path disappears. In this case continuing to fill |
| 138 | * the page cache with dirty data which cannot be written out is |
| 139 | * evil, so prevent that. |
| 140 | */ |
| 141 | if (unlikely(ioend->io_error == -ENODEV)) { |
| 142 | xfs_do_force_shutdown(ip->i_mount, SHUTDOWN_DEVICE_REQ, |
| 143 | __FILE__, __LINE__); |
Christoph Hellwig | b677c21 | 2007-08-29 11:46:28 +1000 | [diff] [blame] | 144 | } |
Christoph Hellwig | 583fa58 | 2008-12-03 12:20:38 +0100 | [diff] [blame] | 145 | |
Christoph Hellwig | 25e41b3 | 2008-12-03 12:20:39 +0100 | [diff] [blame] | 146 | xfs_ioend_wake(ip); |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 147 | mempool_free(ioend, xfs_ioend_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | /* |
Dave Chinner | 932640e | 2009-10-06 20:29:29 +0000 | [diff] [blame] | 151 | * If the end of the current ioend is beyond the current EOF, |
| 152 | * return the new EOF value, otherwise zero. |
| 153 | */ |
| 154 | STATIC xfs_fsize_t |
| 155 | xfs_ioend_new_eof( |
| 156 | xfs_ioend_t *ioend) |
| 157 | { |
| 158 | xfs_inode_t *ip = XFS_I(ioend->io_inode); |
| 159 | xfs_fsize_t isize; |
| 160 | xfs_fsize_t bsize; |
| 161 | |
| 162 | bsize = ioend->io_offset + ioend->io_size; |
| 163 | isize = MAX(ip->i_size, ip->i_new_size); |
| 164 | isize = MIN(isize, bsize); |
| 165 | return isize > ip->i_d.di_size ? isize : 0; |
| 166 | } |
| 167 | |
| 168 | /* |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 169 | * Update on-disk file size now that data has been written to disk. The |
| 170 | * current in-memory file size is i_size. If a write is beyond eof i_new_size |
| 171 | * will be the intended file size until i_size is updated. If this write does |
| 172 | * not extend all the way to the valid file size then restrict this update to |
| 173 | * the end of the write. |
| 174 | * |
| 175 | * This function does not block as blocking on the inode lock in IO completion |
| 176 | * can lead to IO completion order dependency deadlocks.. If it can't get the |
| 177 | * inode ilock it will return EAGAIN. Callers must handle this. |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 178 | */ |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 179 | STATIC int |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 180 | xfs_setfilesize( |
| 181 | xfs_ioend_t *ioend) |
| 182 | { |
Christoph Hellwig | b677c21 | 2007-08-29 11:46:28 +1000 | [diff] [blame] | 183 | xfs_inode_t *ip = XFS_I(ioend->io_inode); |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 184 | xfs_fsize_t isize; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 185 | |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 186 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG); |
| 187 | ASSERT(ioend->io_type != IOMAP_READ); |
| 188 | |
| 189 | if (unlikely(ioend->io_error)) |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 190 | return 0; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 191 | |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 192 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) |
| 193 | return EAGAIN; |
| 194 | |
Dave Chinner | 932640e | 2009-10-06 20:29:29 +0000 | [diff] [blame] | 195 | isize = xfs_ioend_new_eof(ioend); |
| 196 | if (isize) { |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 197 | ip->i_d.di_size = isize; |
Christoph Hellwig | 66d834e | 2010-02-15 09:44:49 +0000 | [diff] [blame] | 198 | xfs_mark_inode_dirty(ip); |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 202 | return 0; |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | /* |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 206 | * Schedule IO completion handling on a xfsdatad if this was |
| 207 | * the final hold on this ioend. If we are asked to wait, |
| 208 | * flush the workqueue. |
| 209 | */ |
| 210 | STATIC void |
| 211 | xfs_finish_ioend( |
| 212 | xfs_ioend_t *ioend, |
| 213 | int wait) |
| 214 | { |
| 215 | if (atomic_dec_and_test(&ioend->io_remaining)) { |
Christoph Hellwig | 5ec4fab | 2009-10-30 09:11:47 +0000 | [diff] [blame] | 216 | struct workqueue_struct *wq; |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 217 | |
Christoph Hellwig | 5ec4fab | 2009-10-30 09:11:47 +0000 | [diff] [blame] | 218 | wq = (ioend->io_type == IOMAP_UNWRITTEN) ? |
| 219 | xfsconvertd_workqueue : xfsdatad_workqueue; |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 220 | queue_work(wq, &ioend->io_work); |
| 221 | if (wait) |
| 222 | flush_workqueue(wq); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | /* |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 227 | * IO write completion. |
| 228 | */ |
| 229 | STATIC void |
| 230 | xfs_end_io( |
| 231 | struct work_struct *work) |
| 232 | { |
| 233 | xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work); |
| 234 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
Dave Chinner | 6941893 | 2010-03-04 00:57:09 +0000 | [diff] [blame] | 235 | int error = 0; |
Dave Chinner | 77d7a0c | 2010-02-17 05:36:29 +0000 | [diff] [blame] | 236 | |
| 237 | /* |
| 238 | * For unwritten extents we need to issue transactions to convert a |
| 239 | * range to normal written extens after the data I/O has finished. |
| 240 | */ |
| 241 | if (ioend->io_type == IOMAP_UNWRITTEN && |
| 242 | likely(!ioend->io_error && !XFS_FORCED_SHUTDOWN(ip->i_mount))) { |
| 243 | |
| 244 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, |
| 245 | ioend->io_size); |
| 246 | if (error) |
| 247 | ioend->io_error = error; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * We might have to update the on-disk file size after extending |
| 252 | * writes. |
| 253 | */ |
| 254 | if (ioend->io_type != IOMAP_READ) { |
| 255 | error = xfs_setfilesize(ioend); |
| 256 | ASSERT(!error || error == EAGAIN); |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * If we didn't complete processing of the ioend, requeue it to the |
| 261 | * tail of the workqueue for another attempt later. Otherwise destroy |
| 262 | * it. |
| 263 | */ |
| 264 | if (error == EAGAIN) { |
| 265 | atomic_inc(&ioend->io_remaining); |
| 266 | xfs_finish_ioend(ioend, 0); |
| 267 | /* ensure we don't spin on blocked ioends */ |
| 268 | delay(1); |
| 269 | } else |
| 270 | xfs_destroy_ioend(ioend); |
| 271 | } |
| 272 | |
| 273 | /* |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 274 | * Allocate and initialise an IO completion structure. |
| 275 | * We need to track unwritten extent write completion here initially. |
| 276 | * We'll need to extend this for updating the ondisk inode size later |
| 277 | * (vs. incore size). |
| 278 | */ |
| 279 | STATIC xfs_ioend_t * |
| 280 | xfs_alloc_ioend( |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 281 | struct inode *inode, |
| 282 | unsigned int type) |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 283 | { |
| 284 | xfs_ioend_t *ioend; |
| 285 | |
| 286 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); |
| 287 | |
| 288 | /* |
| 289 | * Set the count to 1 initially, which will prevent an I/O |
| 290 | * completion callback from happening before we have started |
| 291 | * all the I/O from calling the completion routine too early. |
| 292 | */ |
| 293 | atomic_set(&ioend->io_remaining, 1); |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 294 | ioend->io_error = 0; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 295 | ioend->io_list = NULL; |
| 296 | ioend->io_type = type; |
Christoph Hellwig | b677c21 | 2007-08-29 11:46:28 +1000 | [diff] [blame] | 297 | ioend->io_inode = inode; |
Christoph Hellwig | c1a073b | 2005-09-05 08:23:35 +1000 | [diff] [blame] | 298 | ioend->io_buffer_head = NULL; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 299 | ioend->io_buffer_tail = NULL; |
Christoph Hellwig | b677c21 | 2007-08-29 11:46:28 +1000 | [diff] [blame] | 300 | atomic_inc(&XFS_I(ioend->io_inode)->i_iocount); |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 301 | ioend->io_offset = 0; |
| 302 | ioend->io_size = 0; |
| 303 | |
Christoph Hellwig | 5ec4fab | 2009-10-30 09:11:47 +0000 | [diff] [blame] | 304 | INIT_WORK(&ioend->io_work, xfs_end_io); |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 305 | return ioend; |
| 306 | } |
| 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | STATIC int |
| 309 | xfs_map_blocks( |
| 310 | struct inode *inode, |
| 311 | loff_t offset, |
| 312 | ssize_t count, |
| 313 | xfs_iomap_t *mapp, |
| 314 | int flags) |
| 315 | { |
Christoph Hellwig | 6bd16ff | 2008-12-03 12:20:32 +0100 | [diff] [blame] | 316 | int nmaps = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Christoph Hellwig | 6bd16ff | 2008-12-03 12:20:32 +0100 | [diff] [blame] | 318 | return -xfs_iomap(XFS_I(inode), offset, count, flags, mapp, &nmaps); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
| 320 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 321 | STATIC int |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 322 | xfs_iomap_valid( |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 323 | struct inode *inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | xfs_iomap_t *iomapp, |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 325 | loff_t offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | { |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 327 | struct xfs_mount *mp = XFS_I(inode)->i_mount; |
| 328 | xfs_off_t iomap_offset = XFS_FSB_TO_B(mp, iomapp->iomap_offset); |
| 329 | xfs_off_t iomap_bsize = XFS_FSB_TO_B(mp, iomapp->iomap_bsize); |
| 330 | |
| 331 | return offset >= iomap_offset && |
| 332 | offset < iomap_offset + iomap_bsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 335 | /* |
| 336 | * BIO completion handler for buffered IO. |
| 337 | */ |
Al Viro | 782e3b3 | 2007-10-12 07:17:47 +0100 | [diff] [blame] | 338 | STATIC void |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 339 | xfs_end_bio( |
| 340 | struct bio *bio, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 341 | int error) |
| 342 | { |
| 343 | xfs_ioend_t *ioend = bio->bi_private; |
| 344 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 345 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 346 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 347 | |
| 348 | /* Toss bio and pass work off to an xfsdatad thread */ |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 349 | bio->bi_private = NULL; |
| 350 | bio->bi_end_io = NULL; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 351 | bio_put(bio); |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 352 | |
David Chinner | e927af9 | 2007-06-05 16:24:36 +1000 | [diff] [blame] | 353 | xfs_finish_ioend(ioend, 0); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | STATIC void |
| 357 | xfs_submit_ioend_bio( |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 358 | struct writeback_control *wbc, |
| 359 | xfs_ioend_t *ioend, |
| 360 | struct bio *bio) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 361 | { |
| 362 | atomic_inc(&ioend->io_remaining); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 363 | bio->bi_private = ioend; |
| 364 | bio->bi_end_io = xfs_end_bio; |
| 365 | |
Dave Chinner | 932640e | 2009-10-06 20:29:29 +0000 | [diff] [blame] | 366 | /* |
| 367 | * If the I/O is beyond EOF we mark the inode dirty immediately |
| 368 | * but don't update the inode size until I/O completion. |
| 369 | */ |
| 370 | if (xfs_ioend_new_eof(ioend)) |
Christoph Hellwig | 66d834e | 2010-02-15 09:44:49 +0000 | [diff] [blame] | 371 | xfs_mark_inode_dirty(XFS_I(ioend->io_inode)); |
Dave Chinner | 932640e | 2009-10-06 20:29:29 +0000 | [diff] [blame] | 372 | |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 373 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? |
| 374 | WRITE_SYNC_PLUG : WRITE, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 375 | ASSERT(!bio_flagged(bio, BIO_EOPNOTSUPP)); |
| 376 | bio_put(bio); |
| 377 | } |
| 378 | |
| 379 | STATIC struct bio * |
| 380 | xfs_alloc_ioend_bio( |
| 381 | struct buffer_head *bh) |
| 382 | { |
| 383 | struct bio *bio; |
| 384 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
| 385 | |
| 386 | do { |
| 387 | bio = bio_alloc(GFP_NOIO, nvecs); |
| 388 | nvecs >>= 1; |
| 389 | } while (!bio); |
| 390 | |
| 391 | ASSERT(bio->bi_private == NULL); |
| 392 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
| 393 | bio->bi_bdev = bh->b_bdev; |
| 394 | bio_get(bio); |
| 395 | return bio; |
| 396 | } |
| 397 | |
| 398 | STATIC void |
| 399 | xfs_start_buffer_writeback( |
| 400 | struct buffer_head *bh) |
| 401 | { |
| 402 | ASSERT(buffer_mapped(bh)); |
| 403 | ASSERT(buffer_locked(bh)); |
| 404 | ASSERT(!buffer_delay(bh)); |
| 405 | ASSERT(!buffer_unwritten(bh)); |
| 406 | |
| 407 | mark_buffer_async_write(bh); |
| 408 | set_buffer_uptodate(bh); |
| 409 | clear_buffer_dirty(bh); |
| 410 | } |
| 411 | |
| 412 | STATIC void |
| 413 | xfs_start_page_writeback( |
| 414 | struct page *page, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 415 | int clear_dirty, |
| 416 | int buffers) |
| 417 | { |
| 418 | ASSERT(PageLocked(page)); |
| 419 | ASSERT(!PageWriteback(page)); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 420 | if (clear_dirty) |
David Chinner | 9213202 | 2006-12-21 10:24:01 +1100 | [diff] [blame] | 421 | clear_page_dirty_for_io(page); |
| 422 | set_page_writeback(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 423 | unlock_page(page); |
Fengguang Wu | 1f7decf | 2007-10-16 23:30:42 -0700 | [diff] [blame] | 424 | /* If no buffers on the page are to be written, finish it here */ |
| 425 | if (!buffers) |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 426 | end_page_writeback(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) |
| 430 | { |
| 431 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); |
| 432 | } |
| 433 | |
| 434 | /* |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 435 | * Submit all of the bios for all of the ioends we have saved up, covering the |
| 436 | * initial writepage page and also any probed pages. |
| 437 | * |
| 438 | * Because we may have multiple ioends spanning a page, we need to start |
| 439 | * writeback on all the buffers before we submit them for I/O. If we mark the |
| 440 | * buffers as we got, then we can end up with a page that only has buffers |
| 441 | * marked async write and I/O complete on can occur before we mark the other |
| 442 | * buffers async write. |
| 443 | * |
| 444 | * The end result of this is that we trip a bug in end_page_writeback() because |
| 445 | * we call it twice for the one page as the code in end_buffer_async_write() |
| 446 | * assumes that all buffers on the page are started at the same time. |
| 447 | * |
| 448 | * 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] | 449 | * buffer_heads, and then submit them for I/O on the second pass. |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 450 | */ |
| 451 | STATIC void |
| 452 | xfs_submit_ioend( |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 453 | struct writeback_control *wbc, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 454 | xfs_ioend_t *ioend) |
| 455 | { |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 456 | xfs_ioend_t *head = ioend; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 457 | xfs_ioend_t *next; |
| 458 | struct buffer_head *bh; |
| 459 | struct bio *bio; |
| 460 | sector_t lastblock = 0; |
| 461 | |
David Chinner | d88992f | 2006-01-18 13:38:12 +1100 | [diff] [blame] | 462 | /* Pass 1 - start writeback */ |
| 463 | do { |
| 464 | next = ioend->io_list; |
| 465 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { |
| 466 | xfs_start_buffer_writeback(bh); |
| 467 | } |
| 468 | } while ((ioend = next) != NULL); |
| 469 | |
| 470 | /* Pass 2 - submit I/O */ |
| 471 | ioend = head; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 472 | do { |
| 473 | next = ioend->io_list; |
| 474 | bio = NULL; |
| 475 | |
| 476 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 477 | |
| 478 | if (!bio) { |
| 479 | retry: |
| 480 | bio = xfs_alloc_ioend_bio(bh); |
| 481 | } else if (bh->b_blocknr != lastblock + 1) { |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 482 | xfs_submit_ioend_bio(wbc, ioend, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 483 | goto retry; |
| 484 | } |
| 485 | |
| 486 | if (bio_add_buffer(bio, bh) != bh->b_size) { |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 487 | xfs_submit_ioend_bio(wbc, ioend, bio); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 488 | goto retry; |
| 489 | } |
| 490 | |
| 491 | lastblock = bh->b_blocknr; |
| 492 | } |
| 493 | if (bio) |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 494 | xfs_submit_ioend_bio(wbc, ioend, bio); |
David Chinner | e927af9 | 2007-06-05 16:24:36 +1000 | [diff] [blame] | 495 | xfs_finish_ioend(ioend, 0); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 496 | } while ((ioend = next) != NULL); |
| 497 | } |
| 498 | |
| 499 | /* |
| 500 | * Cancel submission of all buffer_heads so far in this endio. |
| 501 | * Toss the endio too. Only ever called for the initial page |
| 502 | * in a writepage request, so only ever one page. |
| 503 | */ |
| 504 | STATIC void |
| 505 | xfs_cancel_ioend( |
| 506 | xfs_ioend_t *ioend) |
| 507 | { |
| 508 | xfs_ioend_t *next; |
| 509 | struct buffer_head *bh, *next_bh; |
| 510 | |
| 511 | do { |
| 512 | next = ioend->io_list; |
| 513 | bh = ioend->io_buffer_head; |
| 514 | do { |
| 515 | next_bh = bh->b_private; |
| 516 | clear_buffer_async_write(bh); |
| 517 | unlock_buffer(bh); |
| 518 | } while ((bh = next_bh) != NULL); |
| 519 | |
Christoph Hellwig | 25e41b3 | 2008-12-03 12:20:39 +0100 | [diff] [blame] | 520 | xfs_ioend_wake(XFS_I(ioend->io_inode)); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 521 | mempool_free(ioend, xfs_ioend_pool); |
| 522 | } while ((ioend = next) != NULL); |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | * Test to see if we've been building up a completion structure for |
| 527 | * earlier buffers -- if so, we try to append to this ioend if we |
| 528 | * can, otherwise we finish off any current ioend and start another. |
| 529 | * Return true if we've finished the given ioend. |
| 530 | */ |
| 531 | STATIC void |
| 532 | xfs_add_to_ioend( |
| 533 | struct inode *inode, |
| 534 | struct buffer_head *bh, |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 535 | xfs_off_t offset, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 536 | unsigned int type, |
| 537 | xfs_ioend_t **result, |
| 538 | int need_ioend) |
| 539 | { |
| 540 | xfs_ioend_t *ioend = *result; |
| 541 | |
| 542 | if (!ioend || need_ioend || type != ioend->io_type) { |
| 543 | xfs_ioend_t *previous = *result; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 544 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 545 | ioend = xfs_alloc_ioend(inode, type); |
| 546 | ioend->io_offset = offset; |
| 547 | ioend->io_buffer_head = bh; |
| 548 | ioend->io_buffer_tail = bh; |
| 549 | if (previous) |
| 550 | previous->io_list = ioend; |
| 551 | *result = ioend; |
| 552 | } else { |
| 553 | ioend->io_buffer_tail->b_private = bh; |
| 554 | ioend->io_buffer_tail = bh; |
| 555 | } |
| 556 | |
| 557 | bh->b_private = NULL; |
| 558 | ioend->io_size += bh->b_size; |
| 559 | } |
| 560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | STATIC void |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 562 | xfs_map_buffer( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 563 | struct inode *inode, |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 564 | struct buffer_head *bh, |
| 565 | xfs_iomap_t *mp, |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 566 | xfs_off_t offset) |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 567 | { |
| 568 | sector_t bn; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 569 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
| 570 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, mp->iomap_offset); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 571 | |
| 572 | ASSERT(mp->iomap_bn != IOMAP_DADDR_NULL); |
| 573 | |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 574 | bn = (mp->iomap_bn >> (inode->i_blkbits - BBSHIFT)) + |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 575 | ((offset - iomap_offset) >> inode->i_blkbits); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 576 | |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 577 | ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode))); |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 578 | |
| 579 | bh->b_blocknr = bn; |
| 580 | set_buffer_mapped(bh); |
| 581 | } |
| 582 | |
| 583 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | xfs_map_at_offset( |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 585 | struct inode *inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | struct buffer_head *bh, |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 587 | xfs_iomap_t *iomapp, |
| 588 | xfs_off_t offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | ASSERT(!(iomapp->iomap_flags & IOMAP_HOLE)); |
| 591 | ASSERT(!(iomapp->iomap_flags & IOMAP_DELAY)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
| 593 | lock_buffer(bh); |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 594 | xfs_map_buffer(inode, bh, iomapp, offset); |
| 595 | bh->b_bdev = xfs_find_bdev_for_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | set_buffer_mapped(bh); |
| 597 | clear_buffer_delay(bh); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 598 | clear_buffer_unwritten(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |
| 600 | |
| 601 | /* |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 602 | * Look for a page at index that is suitable for clustering. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | */ |
| 604 | STATIC unsigned int |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 605 | xfs_probe_page( |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 606 | struct page *page, |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 607 | unsigned int pg_offset, |
| 608 | int mapped) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | int ret = 0; |
| 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | if (PageWriteback(page)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 613 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
| 615 | if (page->mapping && PageDirty(page)) { |
| 616 | if (page_has_buffers(page)) { |
| 617 | struct buffer_head *bh, *head; |
| 618 | |
| 619 | bh = head = page_buffers(page); |
| 620 | do { |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 621 | if (!buffer_uptodate(bh)) |
| 622 | break; |
| 623 | if (mapped != buffer_mapped(bh)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | break; |
| 625 | ret += bh->b_size; |
| 626 | if (ret >= pg_offset) |
| 627 | break; |
| 628 | } while ((bh = bh->b_this_page) != head); |
| 629 | } else |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 630 | ret = mapped ? 0 : PAGE_CACHE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |
| 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | return ret; |
| 634 | } |
| 635 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 636 | STATIC size_t |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 637 | xfs_probe_cluster( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | struct inode *inode, |
| 639 | struct page *startpage, |
| 640 | struct buffer_head *bh, |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 641 | struct buffer_head *head, |
| 642 | int mapped) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 644 | struct pagevec pvec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | pgoff_t tindex, tlast, tloff; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 646 | size_t total = 0; |
| 647 | int done = 0, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
| 649 | /* First sum forwards in this page */ |
| 650 | do { |
Eric Sandeen | 2353e8e | 2006-02-28 12:30:30 +1100 | [diff] [blame] | 651 | if (!buffer_uptodate(bh) || (mapped != buffer_mapped(bh))) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 652 | return total; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | total += bh->b_size; |
| 654 | } while ((bh = bh->b_this_page) != head); |
| 655 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 656 | /* if we reached the end of the page, sum forwards in following pages */ |
| 657 | tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT; |
| 658 | tindex = startpage->index + 1; |
| 659 | |
| 660 | /* Prune this back to avoid pathological behavior */ |
| 661 | tloff = min(tlast, startpage->index + 64); |
| 662 | |
| 663 | pagevec_init(&pvec, 0); |
| 664 | while (!done && tindex <= tloff) { |
| 665 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); |
| 666 | |
| 667 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) |
| 668 | break; |
| 669 | |
| 670 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 671 | struct page *page = pvec.pages[i]; |
Christoph Hellwig | 265c1fa | 2007-08-16 15:38:19 +1000 | [diff] [blame] | 672 | size_t pg_offset, pg_len = 0; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 673 | |
| 674 | if (tindex == tlast) { |
| 675 | pg_offset = |
| 676 | i_size_read(inode) & (PAGE_CACHE_SIZE - 1); |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 677 | if (!pg_offset) { |
| 678 | done = 1; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 679 | break; |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 680 | } |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 681 | } else |
| 682 | pg_offset = PAGE_CACHE_SIZE; |
| 683 | |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 684 | if (page->index == tindex && trylock_page(page)) { |
Christoph Hellwig | 265c1fa | 2007-08-16 15:38:19 +1000 | [diff] [blame] | 685 | pg_len = xfs_probe_page(page, pg_offset, mapped); |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 686 | unlock_page(page); |
| 687 | } |
| 688 | |
Christoph Hellwig | 265c1fa | 2007-08-16 15:38:19 +1000 | [diff] [blame] | 689 | if (!pg_len) { |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 690 | done = 1; |
| 691 | break; |
| 692 | } |
| 693 | |
Christoph Hellwig | 265c1fa | 2007-08-16 15:38:19 +1000 | [diff] [blame] | 694 | total += pg_len; |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 695 | tindex++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | } |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 697 | |
| 698 | pagevec_release(&pvec); |
| 699 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | } |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | return total; |
| 703 | } |
| 704 | |
| 705 | /* |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 706 | * Test if a given page is suitable for writing as part of an unwritten |
| 707 | * or delayed allocate extent. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | */ |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 709 | STATIC int |
| 710 | xfs_is_delayed_page( |
| 711 | struct page *page, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 712 | unsigned int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | if (PageWriteback(page)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 715 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
| 717 | if (page->mapping && page_has_buffers(page)) { |
| 718 | struct buffer_head *bh, *head; |
| 719 | int acceptable = 0; |
| 720 | |
| 721 | bh = head = page_buffers(page); |
| 722 | do { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 723 | if (buffer_unwritten(bh)) |
| 724 | acceptable = (type == IOMAP_UNWRITTEN); |
| 725 | else if (buffer_delay(bh)) |
| 726 | acceptable = (type == IOMAP_DELAY); |
David Chinner | 2ddee84 | 2006-03-22 12:47:40 +1100 | [diff] [blame] | 727 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
David Chinner | df3c724 | 2007-05-24 15:27:03 +1000 | [diff] [blame] | 728 | acceptable = (type == IOMAP_NEW); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 729 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | } while ((bh = bh->b_this_page) != head); |
| 732 | |
| 733 | if (acceptable) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 734 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | } |
| 736 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 737 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
| 739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | /* |
| 741 | * Allocate & map buffers for page given the extent map. Write it out. |
| 742 | * except for the original page of a writepage, this is called on |
| 743 | * delalloc/unwritten pages only, for the original page it is possible |
| 744 | * that the page has no mapping at all. |
| 745 | */ |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 746 | STATIC int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | xfs_convert_page( |
| 748 | struct inode *inode, |
| 749 | struct page *page, |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 750 | loff_t tindex, |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 751 | xfs_iomap_t *mp, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 752 | xfs_ioend_t **ioendp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | struct writeback_control *wbc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | int startio, |
| 755 | int all_bh) |
| 756 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 757 | struct buffer_head *bh, *head; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 758 | xfs_off_t end_offset; |
| 759 | unsigned long p_offset; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 760 | unsigned int type; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 761 | int len, page_dirty; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 762 | int count = 0, done = 0, uptodate = 1; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 763 | xfs_off_t offset = page_offset(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 765 | if (page->index != tindex) |
| 766 | goto fail; |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 767 | if (!trylock_page(page)) |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 768 | goto fail; |
| 769 | if (PageWriteback(page)) |
| 770 | goto fail_unlock_page; |
| 771 | if (page->mapping != inode->i_mapping) |
| 772 | goto fail_unlock_page; |
| 773 | if (!xfs_is_delayed_page(page, (*ioendp)->io_type)) |
| 774 | goto fail_unlock_page; |
| 775 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 776 | /* |
| 777 | * page_dirty is initially a count of buffers on the page before |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 778 | * EOF and is decremented as we move each into a cleanable state. |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 779 | * |
| 780 | * Derivation: |
| 781 | * |
| 782 | * End offset is the highest offset that this page should represent. |
| 783 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) |
| 784 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and |
| 785 | * hence give us the correct page_dirty count. On any other page, |
| 786 | * it will be zero and in that case we need page_dirty to be the |
| 787 | * count of buffers on the page. |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 788 | */ |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 789 | end_offset = min_t(unsigned long long, |
| 790 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
| 791 | i_size_read(inode)); |
| 792 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 793 | len = 1 << inode->i_blkbits; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 794 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
| 795 | PAGE_CACHE_SIZE); |
| 796 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; |
| 797 | page_dirty = p_offset / len; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | bh = head = page_buffers(page); |
| 800 | do { |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 801 | if (offset >= end_offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | break; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 803 | if (!buffer_uptodate(bh)) |
| 804 | uptodate = 0; |
| 805 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { |
| 806 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | continue; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 808 | } |
| 809 | |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 810 | if (buffer_unwritten(bh) || buffer_delay(bh)) { |
| 811 | if (buffer_unwritten(bh)) |
| 812 | type = IOMAP_UNWRITTEN; |
| 813 | else |
| 814 | type = IOMAP_DELAY; |
| 815 | |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 816 | if (!xfs_iomap_valid(inode, mp, offset)) { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 817 | done = 1; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 818 | continue; |
| 819 | } |
| 820 | |
| 821 | ASSERT(!(mp->iomap_flags & IOMAP_HOLE)); |
| 822 | ASSERT(!(mp->iomap_flags & IOMAP_DELAY)); |
| 823 | |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 824 | xfs_map_at_offset(inode, bh, mp, offset); |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 825 | if (startio) { |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 826 | xfs_add_to_ioend(inode, bh, offset, |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 827 | type, ioendp, done); |
| 828 | } else { |
| 829 | set_buffer_dirty(bh); |
| 830 | unlock_buffer(bh); |
| 831 | mark_buffer_dirty(bh); |
| 832 | } |
| 833 | page_dirty--; |
| 834 | count++; |
| 835 | } else { |
David Chinner | df3c724 | 2007-05-24 15:27:03 +1000 | [diff] [blame] | 836 | type = IOMAP_NEW; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 837 | if (buffer_mapped(bh) && all_bh && startio) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | lock_buffer(bh); |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 839 | xfs_add_to_ioend(inode, bh, offset, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 840 | type, ioendp, done); |
| 841 | count++; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 842 | page_dirty--; |
Christoph Hellwig | 9260dc6 | 2006-01-11 20:48:47 +1100 | [diff] [blame] | 843 | } else { |
| 844 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 847 | } while (offset += len, (bh = bh->b_this_page) != head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 849 | if (uptodate && bh == head) |
| 850 | SetPageUptodate(page); |
| 851 | |
| 852 | if (startio) { |
Christoph Hellwig | f5e596b | 2006-01-11 20:49:42 +1100 | [diff] [blame] | 853 | if (count) { |
David Chinner | 9fddaca | 2006-02-07 20:27:24 +1100 | [diff] [blame] | 854 | wbc->nr_to_write--; |
Wu Fengguang | 0d99519 | 2009-12-03 13:54:25 +0100 | [diff] [blame] | 855 | if (wbc->nr_to_write <= 0) |
Christoph Hellwig | f5e596b | 2006-01-11 20:49:42 +1100 | [diff] [blame] | 856 | done = 1; |
Christoph Hellwig | f5e596b | 2006-01-11 20:49:42 +1100 | [diff] [blame] | 857 | } |
Denys Vlasenko | b41759c | 2008-05-19 16:34:11 +1000 | [diff] [blame] | 858 | xfs_start_page_writeback(page, !page_dirty, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 860 | |
| 861 | return done; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 862 | fail_unlock_page: |
| 863 | unlock_page(page); |
| 864 | fail: |
| 865 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | /* |
| 869 | * Convert & write out a cluster of pages in the same extent as defined |
| 870 | * by mp and following the start page. |
| 871 | */ |
| 872 | STATIC void |
| 873 | xfs_cluster_write( |
| 874 | struct inode *inode, |
| 875 | pgoff_t tindex, |
| 876 | xfs_iomap_t *iomapp, |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 877 | xfs_ioend_t **ioendp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | struct writeback_control *wbc, |
| 879 | int startio, |
| 880 | int all_bh, |
| 881 | pgoff_t tlast) |
| 882 | { |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 883 | struct pagevec pvec; |
| 884 | int done = 0, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 886 | pagevec_init(&pvec, 0); |
| 887 | while (!done && tindex <= tlast) { |
| 888 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); |
| 889 | |
| 890 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | break; |
Christoph Hellwig | 10ce444 | 2006-01-11 20:48:14 +1100 | [diff] [blame] | 892 | |
| 893 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 894 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, |
| 895 | iomapp, ioendp, wbc, startio, all_bh); |
| 896 | if (done) |
| 897 | break; |
| 898 | } |
| 899 | |
| 900 | pagevec_release(&pvec); |
| 901 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | } |
| 903 | } |
| 904 | |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 905 | STATIC void |
| 906 | xfs_vm_invalidatepage( |
| 907 | struct page *page, |
| 908 | unsigned long offset) |
| 909 | { |
| 910 | trace_xfs_invalidatepage(page->mapping->host, page, offset); |
| 911 | block_invalidatepage(page, offset); |
| 912 | } |
| 913 | |
| 914 | /* |
| 915 | * If the page has delalloc buffers on it, we need to punch them out before we |
| 916 | * invalidate the page. If we don't, we leave a stale delalloc mapping on the |
| 917 | * inode that can trip a BUG() in xfs_get_blocks() later on if a direct IO read |
| 918 | * is done on that same region - the delalloc extent is returned when none is |
| 919 | * supposed to be there. |
| 920 | * |
| 921 | * We prevent this by truncating away the delalloc regions on the page before |
| 922 | * invalidating it. Because they are delalloc, we can do this without needing a |
| 923 | * transaction. Indeed - if we get ENOSPC errors, we have to be able to do this |
| 924 | * truncation without a transaction as there is no space left for block |
| 925 | * reservation (typically why we see a ENOSPC in writeback). |
| 926 | * |
| 927 | * This is not a performance critical path, so for now just do the punching a |
| 928 | * buffer head at a time. |
| 929 | */ |
| 930 | STATIC void |
| 931 | xfs_aops_discard_page( |
| 932 | struct page *page) |
| 933 | { |
| 934 | struct inode *inode = page->mapping->host; |
| 935 | struct xfs_inode *ip = XFS_I(inode); |
| 936 | struct buffer_head *bh, *head; |
| 937 | loff_t offset = page_offset(page); |
| 938 | ssize_t len = 1 << inode->i_blkbits; |
| 939 | |
| 940 | if (!xfs_is_delayed_page(page, IOMAP_DELAY)) |
| 941 | goto out_invalidate; |
| 942 | |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 943 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 944 | goto out_invalidate; |
| 945 | |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 946 | xfs_fs_cmn_err(CE_ALERT, ip->i_mount, |
| 947 | "page discard on page %p, inode 0x%llx, offset %llu.", |
| 948 | page, ip->i_ino, offset); |
| 949 | |
| 950 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 951 | bh = head = page_buffers(page); |
| 952 | do { |
| 953 | int done; |
| 954 | xfs_fileoff_t offset_fsb; |
| 955 | xfs_bmbt_irec_t imap; |
| 956 | int nimaps = 1; |
| 957 | int error; |
| 958 | xfs_fsblock_t firstblock; |
| 959 | xfs_bmap_free_t flist; |
| 960 | |
| 961 | if (!buffer_delay(bh)) |
| 962 | goto next_buffer; |
| 963 | |
| 964 | offset_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); |
| 965 | |
| 966 | /* |
| 967 | * Map the range first and check that it is a delalloc extent |
| 968 | * before trying to unmap the range. Otherwise we will be |
| 969 | * trying to remove a real extent (which requires a |
| 970 | * transaction) or a hole, which is probably a bad idea... |
| 971 | */ |
| 972 | error = xfs_bmapi(NULL, ip, offset_fsb, 1, |
| 973 | XFS_BMAPI_ENTIRE, NULL, 0, &imap, |
| 974 | &nimaps, NULL, NULL); |
| 975 | |
| 976 | if (error) { |
| 977 | /* something screwed, just bail */ |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 978 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
| 979 | xfs_fs_cmn_err(CE_ALERT, ip->i_mount, |
| 980 | "page discard failed delalloc mapping lookup."); |
| 981 | } |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 982 | break; |
| 983 | } |
| 984 | if (!nimaps) { |
| 985 | /* nothing there */ |
| 986 | goto next_buffer; |
| 987 | } |
| 988 | if (imap.br_startblock != DELAYSTARTBLOCK) { |
| 989 | /* been converted, ignore */ |
| 990 | goto next_buffer; |
| 991 | } |
| 992 | WARN_ON(imap.br_blockcount == 0); |
| 993 | |
| 994 | /* |
| 995 | * Note: while we initialise the firstblock/flist pair, they |
| 996 | * should never be used because blocks should never be |
| 997 | * allocated or freed for a delalloc extent and hence we need |
| 998 | * don't cancel or finish them after the xfs_bunmapi() call. |
| 999 | */ |
| 1000 | xfs_bmap_init(&flist, &firstblock); |
| 1001 | error = xfs_bunmapi(NULL, ip, offset_fsb, 1, 0, 1, &firstblock, |
| 1002 | &flist, NULL, &done); |
| 1003 | |
| 1004 | ASSERT(!flist.xbf_count && !flist.xbf_first); |
| 1005 | if (error) { |
| 1006 | /* something screwed, just bail */ |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 1007 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
| 1008 | xfs_fs_cmn_err(CE_ALERT, ip->i_mount, |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 1009 | "page discard unable to remove delalloc mapping."); |
Dave Chinner | e8c3753 | 2010-03-15 02:36:35 +0000 | [diff] [blame] | 1010 | } |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 1011 | break; |
| 1012 | } |
| 1013 | next_buffer: |
| 1014 | offset += len; |
| 1015 | |
| 1016 | } while ((bh = bh->b_this_page) != head); |
| 1017 | |
| 1018 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 1019 | out_invalidate: |
| 1020 | xfs_vm_invalidatepage(page, 0); |
| 1021 | return; |
| 1022 | } |
| 1023 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | /* |
| 1025 | * Calling this without startio set means we are being asked to make a dirty |
| 1026 | * page ready for freeing it's buffers. When called with startio set then |
| 1027 | * we are coming from writepage. |
| 1028 | * |
| 1029 | * When called with startio set it is important that we write the WHOLE |
| 1030 | * page if possible. |
| 1031 | * The bh->b_state's cannot know if any of the blocks or which block for |
| 1032 | * that matter are dirty due to mmap writes, and therefore bh uptodate is |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 1033 | * only valid if the page itself isn't completely uptodate. Some layers |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | * may clear the page dirty flag prior to calling write page, under the |
| 1035 | * assumption the entire page will be written out; by not writing out the |
| 1036 | * whole page the page can be reused before all valid dirty data is |
| 1037 | * written out. Note: in the case of a page that has been dirty'd by |
| 1038 | * mapwrite and but partially setup by block_prepare_write the |
| 1039 | * bh->b_states's will not agree and only ones setup by BPW/BCW will have |
| 1040 | * valid state, thus the whole page must be written out thing. |
| 1041 | */ |
| 1042 | |
| 1043 | STATIC int |
| 1044 | xfs_page_state_convert( |
| 1045 | struct inode *inode, |
| 1046 | struct page *page, |
| 1047 | struct writeback_control *wbc, |
| 1048 | int startio, |
| 1049 | int unmapped) /* also implies page uptodate */ |
| 1050 | { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1051 | struct buffer_head *bh, *head; |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1052 | xfs_iomap_t iomap; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1053 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | loff_t offset; |
| 1055 | unsigned long p_offset = 0; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1056 | unsigned int type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | __uint64_t end_offset; |
| 1058 | pgoff_t end_index, last_index, tlast; |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1059 | ssize_t size, len; |
| 1060 | int flags, err, iomap_valid = 0, uptodate = 1; |
Nathan Scott | 8272145 | 2006-04-11 15:10:55 +1000 | [diff] [blame] | 1061 | int page_dirty, count = 0; |
| 1062 | int trylock = 0; |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1063 | int all_bh = unmapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
Nathan Scott | 8272145 | 2006-04-11 15:10:55 +1000 | [diff] [blame] | 1065 | if (startio) { |
| 1066 | if (wbc->sync_mode == WB_SYNC_NONE && wbc->nonblocking) |
| 1067 | trylock |= BMAPI_TRYLOCK; |
| 1068 | } |
Daniel Moore | 3ba0815 | 2005-05-05 13:31:34 -0700 | [diff] [blame] | 1069 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | /* Is this page beyond the end of the file? */ |
| 1071 | offset = i_size_read(inode); |
| 1072 | end_index = offset >> PAGE_CACHE_SHIFT; |
| 1073 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; |
| 1074 | if (page->index >= end_index) { |
| 1075 | if ((page->index >= end_index + 1) || |
| 1076 | !(i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) { |
Nathan Scott | 19d5bcf | 2005-11-02 15:14:09 +1100 | [diff] [blame] | 1077 | if (startio) |
| 1078 | unlock_page(page); |
| 1079 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } |
| 1081 | } |
| 1082 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | /* |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 1084 | * page_dirty is initially a count of buffers on the page before |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 1085 | * EOF and is decremented as we move each into a cleanable state. |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1086 | * |
| 1087 | * Derivation: |
| 1088 | * |
| 1089 | * End offset is the highest offset that this page should represent. |
| 1090 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) |
| 1091 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and |
| 1092 | * hence give us the correct page_dirty count. On any other page, |
| 1093 | * it will be zero and in that case we need page_dirty to be the |
| 1094 | * count of buffers on the page. |
| 1095 | */ |
| 1096 | end_offset = min_t(unsigned long long, |
| 1097 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, offset); |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 1098 | len = 1 << inode->i_blkbits; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1099 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
| 1100 | PAGE_CACHE_SIZE); |
| 1101 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 1102 | page_dirty = p_offset / len; |
| 1103 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 1104 | bh = head = page_buffers(page); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1105 | offset = page_offset(page); |
David Chinner | df3c724 | 2007-05-24 15:27:03 +1000 | [diff] [blame] | 1106 | flags = BMAPI_READ; |
| 1107 | type = IOMAP_NEW; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1108 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1109 | /* TODO: cleanup count and page_dirty */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | |
| 1111 | do { |
| 1112 | if (offset >= end_offset) |
| 1113 | break; |
| 1114 | if (!buffer_uptodate(bh)) |
| 1115 | uptodate = 0; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1116 | if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio) { |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1117 | /* |
| 1118 | * the iomap is actually still valid, but the ioend |
| 1119 | * isn't. shouldn't happen too often. |
| 1120 | */ |
| 1121 | iomap_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | continue; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1123 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1125 | if (iomap_valid) |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 1126 | iomap_valid = xfs_iomap_valid(inode, &iomap, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | |
| 1128 | /* |
| 1129 | * First case, map an unwritten extent and prepare for |
| 1130 | * extent state conversion transaction on completion. |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1131 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | * Second case, allocate space for a delalloc buffer. |
| 1133 | * We can return EAGAIN here in the release page case. |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1134 | * |
| 1135 | * Third case, an unmapped buffer was found, and we are |
| 1136 | * in a path where we need to write the whole page out. |
David Chinner | df3c724 | 2007-05-24 15:27:03 +1000 | [diff] [blame] | 1137 | */ |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1138 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
| 1139 | ((buffer_uptodate(bh) || PageUptodate(page)) && |
| 1140 | !buffer_mapped(bh) && (unmapped || startio))) { |
David Chinner | effd120 | 2007-06-18 16:49:58 +1000 | [diff] [blame] | 1141 | int new_ioend = 0; |
| 1142 | |
David Chinner | df3c724 | 2007-05-24 15:27:03 +1000 | [diff] [blame] | 1143 | /* |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1144 | * Make sure we don't use a read-only iomap |
| 1145 | */ |
David Chinner | df3c724 | 2007-05-24 15:27:03 +1000 | [diff] [blame] | 1146 | if (flags == BMAPI_READ) |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1147 | iomap_valid = 0; |
| 1148 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1149 | if (buffer_unwritten(bh)) { |
| 1150 | type = IOMAP_UNWRITTEN; |
Nathan Scott | 8272145 | 2006-04-11 15:10:55 +1000 | [diff] [blame] | 1151 | flags = BMAPI_WRITE | BMAPI_IGNSTATE; |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1152 | } else if (buffer_delay(bh)) { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1153 | type = IOMAP_DELAY; |
Nathan Scott | 8272145 | 2006-04-11 15:10:55 +1000 | [diff] [blame] | 1154 | flags = BMAPI_ALLOCATE | trylock; |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1155 | } else { |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1156 | type = IOMAP_NEW; |
Nathan Scott | 8272145 | 2006-04-11 15:10:55 +1000 | [diff] [blame] | 1157 | flags = BMAPI_WRITE | BMAPI_MMAP; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1158 | } |
| 1159 | |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1160 | if (!iomap_valid) { |
David Chinner | effd120 | 2007-06-18 16:49:58 +1000 | [diff] [blame] | 1161 | /* |
| 1162 | * if we didn't have a valid mapping then we |
| 1163 | * need to ensure that we put the new mapping |
| 1164 | * in a new ioend structure. This needs to be |
| 1165 | * done to ensure that the ioends correctly |
| 1166 | * reflect the block mappings at io completion |
| 1167 | * for unwritten extent conversion. |
| 1168 | */ |
| 1169 | new_ioend = 1; |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1170 | if (type == IOMAP_NEW) { |
| 1171 | size = xfs_probe_cluster(inode, |
| 1172 | page, bh, head, 0); |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1173 | } else { |
| 1174 | size = len; |
| 1175 | } |
| 1176 | |
| 1177 | err = xfs_map_blocks(inode, offset, size, |
| 1178 | &iomap, flags); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1179 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | goto error; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 1181 | iomap_valid = xfs_iomap_valid(inode, &iomap, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | } |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1183 | if (iomap_valid) { |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 1184 | xfs_map_at_offset(inode, bh, &iomap, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | if (startio) { |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 1186 | xfs_add_to_ioend(inode, bh, offset, |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1187 | type, &ioend, |
David Chinner | effd120 | 2007-06-18 16:49:58 +1000 | [diff] [blame] | 1188 | new_ioend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | } else { |
| 1190 | set_buffer_dirty(bh); |
| 1191 | unlock_buffer(bh); |
| 1192 | mark_buffer_dirty(bh); |
| 1193 | } |
| 1194 | page_dirty--; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1195 | count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | } |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1197 | } else if (buffer_uptodate(bh) && startio) { |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1198 | /* |
| 1199 | * we got here because the buffer is already mapped. |
| 1200 | * That means it must already have extents allocated |
| 1201 | * underneath it. Map the extent by reading it. |
| 1202 | */ |
David Chinner | df3c724 | 2007-05-24 15:27:03 +1000 | [diff] [blame] | 1203 | if (!iomap_valid || flags != BMAPI_READ) { |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1204 | flags = BMAPI_READ; |
| 1205 | size = xfs_probe_cluster(inode, page, bh, |
| 1206 | head, 1); |
| 1207 | err = xfs_map_blocks(inode, offset, size, |
| 1208 | &iomap, flags); |
| 1209 | if (err) |
| 1210 | goto error; |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 1211 | iomap_valid = xfs_iomap_valid(inode, &iomap, offset); |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | |
David Chinner | df3c724 | 2007-05-24 15:27:03 +1000 | [diff] [blame] | 1214 | /* |
| 1215 | * We set the type to IOMAP_NEW in case we are doing a |
| 1216 | * small write at EOF that is extending the file but |
| 1217 | * without needing an allocation. We need to update the |
| 1218 | * file size on I/O completion in this case so it is |
| 1219 | * the same case as having just allocated a new extent |
| 1220 | * that we are writing into for the first time. |
| 1221 | */ |
| 1222 | type = IOMAP_NEW; |
Nick Piggin | ca5de40 | 2008-08-02 12:02:13 +0200 | [diff] [blame] | 1223 | if (trylock_buffer(bh)) { |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1224 | ASSERT(buffer_mapped(bh)); |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1225 | if (iomap_valid) |
| 1226 | all_bh = 1; |
Christoph Hellwig | 7336cea | 2006-01-11 20:49:16 +1100 | [diff] [blame] | 1227 | xfs_add_to_ioend(inode, bh, offset, type, |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1228 | &ioend, !iomap_valid); |
| 1229 | page_dirty--; |
| 1230 | count++; |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1231 | } else { |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1232 | iomap_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | } |
Christoph Hellwig | d5cb48a | 2006-01-11 20:49:02 +1100 | [diff] [blame] | 1234 | } else if ((buffer_uptodate(bh) || PageUptodate(page)) && |
| 1235 | (unmapped || startio)) { |
| 1236 | iomap_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | } |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1238 | |
| 1239 | if (!iohead) |
| 1240 | iohead = ioend; |
| 1241 | |
| 1242 | } while (offset += len, ((bh = bh->b_this_page) != head)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | |
| 1244 | if (uptodate && bh == head) |
| 1245 | SetPageUptodate(page); |
| 1246 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1247 | if (startio) |
Denys Vlasenko | b41759c | 2008-05-19 16:34:11 +1000 | [diff] [blame] | 1248 | xfs_start_page_writeback(page, 1, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1250 | if (ioend && iomap_valid) { |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 1251 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
| 1252 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, iomap.iomap_offset); |
| 1253 | xfs_off_t iomap_bsize = XFS_FSB_TO_B(m, iomap.iomap_bsize); |
| 1254 | |
| 1255 | offset = (iomap_offset + iomap_bsize - 1) >> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | PAGE_CACHE_SHIFT; |
Nathan Scott | 775bf6c | 2005-05-05 13:33:01 -0700 | [diff] [blame] | 1257 | tlast = min_t(pgoff_t, offset, last_index); |
Christoph Hellwig | 1defeac | 2006-01-11 20:48:33 +1100 | [diff] [blame] | 1258 | xfs_cluster_write(inode, page->index + 1, &iomap, &ioend, |
Christoph Hellwig | 6c4fe19 | 2006-01-11 20:49:28 +1100 | [diff] [blame] | 1259 | wbc, startio, all_bh, tlast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | } |
| 1261 | |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1262 | if (iohead) |
Christoph Hellwig | 06342cf | 2009-10-30 09:09:15 +0000 | [diff] [blame] | 1263 | xfs_submit_ioend(wbc, iohead); |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | return page_dirty; |
| 1266 | |
| 1267 | error: |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1268 | if (iohead) |
| 1269 | xfs_cancel_ioend(iohead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | |
| 1271 | /* |
| 1272 | * If it's delalloc and we have nowhere to put it, |
| 1273 | * throw it away, unless the lower layers told |
| 1274 | * us to try again. |
| 1275 | */ |
| 1276 | if (err != -EAGAIN) { |
Christoph Hellwig | f6d6d4f | 2006-01-11 15:40:13 +1100 | [diff] [blame] | 1277 | if (!unmapped) |
Dave Chinner | 3ed3a43 | 2010-03-05 02:00:42 +0000 | [diff] [blame] | 1278 | xfs_aops_discard_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | ClearPageUptodate(page); |
| 1280 | } |
| 1281 | return err; |
| 1282 | } |
| 1283 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1284 | /* |
| 1285 | * writepage: Called from one of two places: |
| 1286 | * |
| 1287 | * 1. we are flushing a delalloc buffer head. |
| 1288 | * |
| 1289 | * 2. we are writing out a dirty page. Typically the page dirty |
| 1290 | * state is cleared before we get here. In this case is it |
| 1291 | * conceivable we have no buffer heads. |
| 1292 | * |
| 1293 | * For delalloc space on the page we need to allocate space and |
| 1294 | * flush it. For unmapped buffer heads on the page we should |
| 1295 | * allocate space if the page is uptodate. For any other dirty |
| 1296 | * buffer heads on the page we should flush them. |
| 1297 | * |
| 1298 | * If we detect that a transaction would be required to flush |
| 1299 | * the page, we have to check the process flags first, if we |
| 1300 | * are already in a transaction or disk I/O during allocations |
| 1301 | * is off, we need to fail the writepage and redirty the page. |
| 1302 | */ |
| 1303 | |
| 1304 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1305 | xfs_vm_writepage( |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1306 | struct page *page, |
| 1307 | struct writeback_control *wbc) |
| 1308 | { |
| 1309 | int error; |
| 1310 | int need_trans; |
| 1311 | int delalloc, unmapped, unwritten; |
| 1312 | struct inode *inode = page->mapping->host; |
| 1313 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1314 | trace_xfs_writepage(inode, page, 0); |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1315 | |
| 1316 | /* |
| 1317 | * We need a transaction if: |
| 1318 | * 1. There are delalloc buffers on the page |
| 1319 | * 2. The page is uptodate and we have unmapped buffers |
| 1320 | * 3. The page is uptodate and we have no buffers |
| 1321 | * 4. There are unwritten buffers on the page |
| 1322 | */ |
| 1323 | |
| 1324 | if (!page_has_buffers(page)) { |
| 1325 | unmapped = 1; |
| 1326 | need_trans = 1; |
| 1327 | } else { |
| 1328 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); |
| 1329 | if (!PageUptodate(page)) |
| 1330 | unmapped = 0; |
| 1331 | need_trans = delalloc + unmapped + unwritten; |
| 1332 | } |
| 1333 | |
| 1334 | /* |
| 1335 | * If we need a transaction and the process flags say |
| 1336 | * we are already in a transaction, or no IO is allowed |
| 1337 | * then mark the page dirty again and leave the page |
| 1338 | * as is. |
| 1339 | */ |
Nathan Scott | 59c1b08 | 2006-06-09 14:59:13 +1000 | [diff] [blame] | 1340 | if (current_test_flags(PF_FSTRANS) && need_trans) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1341 | goto out_fail; |
| 1342 | |
| 1343 | /* |
| 1344 | * Delay hooking up buffer heads until we have |
| 1345 | * made our go/no-go decision. |
| 1346 | */ |
| 1347 | if (!page_has_buffers(page)) |
| 1348 | create_empty_buffers(page, 1 << inode->i_blkbits, 0); |
| 1349 | |
Eric Sandeen | c8a4051 | 2009-07-31 00:02:17 -0500 | [diff] [blame] | 1350 | |
| 1351 | /* |
| 1352 | * VM calculation for nr_to_write seems off. Bump it way |
| 1353 | * up, this gets simple streaming writes zippy again. |
| 1354 | * To be reviewed again after Jens' writeback changes. |
| 1355 | */ |
| 1356 | wbc->nr_to_write *= 4; |
| 1357 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1358 | /* |
| 1359 | * Convert delayed allocate, unwritten or unmapped space |
| 1360 | * to real space and flush out to disk. |
| 1361 | */ |
| 1362 | error = xfs_page_state_convert(inode, page, wbc, 1, unmapped); |
| 1363 | if (error == -EAGAIN) |
| 1364 | goto out_fail; |
| 1365 | if (unlikely(error < 0)) |
| 1366 | goto out_unlock; |
| 1367 | |
| 1368 | return 0; |
| 1369 | |
| 1370 | out_fail: |
| 1371 | redirty_page_for_writepage(wbc, page); |
| 1372 | unlock_page(page); |
| 1373 | return 0; |
| 1374 | out_unlock: |
| 1375 | unlock_page(page); |
| 1376 | return error; |
| 1377 | } |
| 1378 | |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1379 | STATIC int |
| 1380 | xfs_vm_writepages( |
| 1381 | struct address_space *mapping, |
| 1382 | struct writeback_control *wbc) |
| 1383 | { |
Christoph Hellwig | b3aea4e | 2007-08-29 11:44:37 +1000 | [diff] [blame] | 1384 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1385 | return generic_writepages(mapping, wbc); |
| 1386 | } |
| 1387 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1388 | /* |
| 1389 | * Called to move a page into cleanable state - and from there |
| 1390 | * to be released. Possibly the page is already clean. We always |
| 1391 | * have buffer heads in this call. |
| 1392 | * |
| 1393 | * Returns 0 if the page is ok to release, 1 otherwise. |
| 1394 | * |
| 1395 | * Possible scenarios are: |
| 1396 | * |
| 1397 | * 1. We are being called to release a page which has been written |
| 1398 | * to via regular I/O. buffer heads will be dirty and possibly |
| 1399 | * delalloc. If no delalloc buffer heads in this case then we |
| 1400 | * can just return zero. |
| 1401 | * |
| 1402 | * 2. We are called to release a page which has been written via |
| 1403 | * mmap, all we need to do is ensure there is no delalloc |
| 1404 | * state in the buffer heads, if not we can let the caller |
| 1405 | * free them and we should come back later via writepage. |
| 1406 | */ |
| 1407 | STATIC int |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1408 | xfs_vm_releasepage( |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1409 | struct page *page, |
| 1410 | gfp_t gfp_mask) |
| 1411 | { |
| 1412 | struct inode *inode = page->mapping->host; |
| 1413 | int dirty, delalloc, unmapped, unwritten; |
| 1414 | struct writeback_control wbc = { |
| 1415 | .sync_mode = WB_SYNC_ALL, |
| 1416 | .nr_to_write = 1, |
| 1417 | }; |
| 1418 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1419 | trace_xfs_releasepage(inode, page, 0); |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1420 | |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1421 | if (!page_has_buffers(page)) |
| 1422 | return 0; |
| 1423 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1424 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); |
| 1425 | if (!delalloc && !unwritten) |
| 1426 | goto free_buffers; |
| 1427 | |
| 1428 | if (!(gfp_mask & __GFP_FS)) |
| 1429 | return 0; |
| 1430 | |
| 1431 | /* If we are already inside a transaction or the thread cannot |
| 1432 | * do I/O, we cannot release this page. |
| 1433 | */ |
Nathan Scott | 59c1b08 | 2006-06-09 14:59:13 +1000 | [diff] [blame] | 1434 | if (current_test_flags(PF_FSTRANS)) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1435 | return 0; |
| 1436 | |
| 1437 | /* |
| 1438 | * Convert delalloc space to real space, do not flush the |
| 1439 | * data out to disk, that will be done by the caller. |
| 1440 | * Never need to allocate space here - we will always |
| 1441 | * come back to writepage in that case. |
| 1442 | */ |
| 1443 | dirty = xfs_page_state_convert(inode, page, &wbc, 0, 0); |
| 1444 | if (dirty == 0 && !unwritten) |
| 1445 | goto free_buffers; |
| 1446 | return 0; |
| 1447 | |
| 1448 | free_buffers: |
| 1449 | return try_to_free_buffers(page); |
| 1450 | } |
| 1451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | STATIC int |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1453 | __xfs_get_blocks( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | struct inode *inode, |
| 1455 | sector_t iblock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | struct buffer_head *bh_result, |
| 1457 | int create, |
| 1458 | int direct, |
| 1459 | bmapi_flags_t flags) |
| 1460 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | xfs_iomap_t iomap; |
Nathan Scott | fdc7ed7 | 2005-11-02 15:13:13 +1100 | [diff] [blame] | 1462 | xfs_off_t offset; |
| 1463 | ssize_t size; |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1464 | int niomap = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | |
Nathan Scott | fdc7ed7 | 2005-11-02 15:13:13 +1100 | [diff] [blame] | 1467 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1468 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
| 1469 | size = bh_result->b_size; |
Lachlan McIlroy | 364f358 | 2008-09-17 16:50:14 +1000 | [diff] [blame] | 1470 | |
| 1471 | if (!create && direct && offset >= i_size_read(inode)) |
| 1472 | return 0; |
| 1473 | |
Lachlan McIlroy | 541d7d3 | 2007-10-11 17:34:33 +1000 | [diff] [blame] | 1474 | error = xfs_iomap(XFS_I(inode), offset, size, |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1475 | create ? flags : BMAPI_READ, &iomap, &niomap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | if (error) |
| 1477 | return -error; |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1478 | if (niomap == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | return 0; |
| 1480 | |
| 1481 | if (iomap.iomap_bn != IOMAP_DADDR_NULL) { |
Nathan Scott | 87cbc49 | 2006-03-14 13:26:43 +1100 | [diff] [blame] | 1482 | /* |
| 1483 | * For unwritten extents do not report a disk address on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | * the read case (treat as if we're reading into a hole). |
| 1485 | */ |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 1486 | if (create || !(iomap.iomap_flags & IOMAP_UNWRITTEN)) |
| 1487 | xfs_map_buffer(inode, bh_result, &iomap, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | if (create && (iomap.iomap_flags & IOMAP_UNWRITTEN)) { |
| 1489 | if (direct) |
| 1490 | bh_result->b_private = inode; |
| 1491 | set_buffer_unwritten(bh_result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | } |
| 1493 | } |
| 1494 | |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1495 | /* |
| 1496 | * If this is a realtime file, data may be on a different device. |
| 1497 | * to that pointed to from the buffer_head b_bdev currently. |
| 1498 | */ |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 1499 | bh_result->b_bdev = xfs_find_bdev_for_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1501 | /* |
David Chinner | 549054a | 2007-02-10 18:36:35 +1100 | [diff] [blame] | 1502 | * If we previously allocated a block out beyond eof and we are now |
| 1503 | * coming back to use it then we will need to flag it as new even if it |
| 1504 | * has a disk address. |
| 1505 | * |
| 1506 | * With sub-block writes into unwritten extents we also need to mark |
| 1507 | * the buffer as new so that the unwritten parts of the buffer gets |
| 1508 | * correctly zeroed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | */ |
| 1510 | if (create && |
| 1511 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || |
David Chinner | 549054a | 2007-02-10 18:36:35 +1100 | [diff] [blame] | 1512 | (offset >= i_size_read(inode)) || |
| 1513 | (iomap.iomap_flags & (IOMAP_NEW|IOMAP_UNWRITTEN)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | set_buffer_new(bh_result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | |
| 1516 | if (iomap.iomap_flags & IOMAP_DELAY) { |
| 1517 | BUG_ON(direct); |
| 1518 | if (create) { |
| 1519 | set_buffer_uptodate(bh_result); |
| 1520 | set_buffer_mapped(bh_result); |
| 1521 | set_buffer_delay(bh_result); |
| 1522 | } |
| 1523 | } |
| 1524 | |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1525 | if (direct || size > (1 << inode->i_blkbits)) { |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 1526 | struct xfs_mount *mp = XFS_I(inode)->i_mount; |
| 1527 | xfs_off_t iomap_offset = XFS_FSB_TO_B(mp, iomap.iomap_offset); |
| 1528 | xfs_off_t iomap_delta = offset - iomap_offset; |
| 1529 | xfs_off_t iomap_bsize = XFS_FSB_TO_B(mp, iomap.iomap_bsize); |
Christoph Hellwig | 9563b3d | 2010-04-28 12:28:53 +0000 | [diff] [blame] | 1530 | |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 1531 | ASSERT(iomap_bsize - iomap_delta > 0); |
Nathan Scott | fdc7ed7 | 2005-11-02 15:13:13 +1100 | [diff] [blame] | 1532 | offset = min_t(xfs_off_t, |
Christoph Hellwig | 8699bb0 | 2010-04-28 12:28:54 +0000 | [diff] [blame^] | 1533 | iomap_bsize - iomap_delta, size); |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1534 | bh_result->b_size = (ssize_t)min_t(xfs_off_t, LONG_MAX, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | } |
| 1536 | |
| 1537 | return 0; |
| 1538 | } |
| 1539 | |
| 1540 | int |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1541 | xfs_get_blocks( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | struct inode *inode, |
| 1543 | sector_t iblock, |
| 1544 | struct buffer_head *bh_result, |
| 1545 | int create) |
| 1546 | { |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1547 | return __xfs_get_blocks(inode, iblock, |
Badari Pulavarty | fa30bd0 | 2006-03-26 01:38:01 -0800 | [diff] [blame] | 1548 | bh_result, create, 0, BMAPI_WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | } |
| 1550 | |
| 1551 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1552 | xfs_get_blocks_direct( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | struct inode *inode, |
| 1554 | sector_t iblock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | struct buffer_head *bh_result, |
| 1556 | int create) |
| 1557 | { |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1558 | return __xfs_get_blocks(inode, iblock, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 1559 | bh_result, create, 1, BMAPI_WRITE|BMAPI_DIRECT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | } |
| 1561 | |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1562 | STATIC void |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1563 | xfs_end_io_direct( |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1564 | struct kiocb *iocb, |
| 1565 | loff_t offset, |
| 1566 | ssize_t size, |
| 1567 | void *private) |
| 1568 | { |
| 1569 | xfs_ioend_t *ioend = iocb->private; |
| 1570 | |
| 1571 | /* |
| 1572 | * Non-NULL private data means we need to issue a transaction to |
| 1573 | * convert a range from unwritten to written extents. This needs |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 1574 | * to happen from process context but aio+dio I/O completion |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1575 | * happens from irq context so we need to defer it to a workqueue. |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 1576 | * This is not necessary for synchronous direct I/O, but we do |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1577 | * it anyway to keep the code uniform and simpler. |
| 1578 | * |
David Chinner | e927af9 | 2007-06-05 16:24:36 +1000 | [diff] [blame] | 1579 | * Well, if only it were that simple. Because synchronous direct I/O |
| 1580 | * requires extent conversion to occur *before* we return to userspace, |
| 1581 | * we have to wait for extent conversion to complete. Look at the |
| 1582 | * iocb that has been passed to us to determine if this is AIO or |
| 1583 | * not. If it is synchronous, tell xfs_finish_ioend() to kick the |
| 1584 | * workqueue and wait for it to complete. |
| 1585 | * |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1586 | * The core direct I/O code might be changed to always call the |
| 1587 | * completion handler in the future, in which case all this can |
| 1588 | * go away. |
| 1589 | */ |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 1590 | ioend->io_offset = offset; |
| 1591 | ioend->io_size = size; |
| 1592 | if (ioend->io_type == IOMAP_READ) { |
David Chinner | e927af9 | 2007-06-05 16:24:36 +1000 | [diff] [blame] | 1593 | xfs_finish_ioend(ioend, 0); |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 1594 | } else if (private && size > 0) { |
David Chinner | e927af9 | 2007-06-05 16:24:36 +1000 | [diff] [blame] | 1595 | xfs_finish_ioend(ioend, is_sync_kiocb(iocb)); |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1596 | } else { |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 1597 | /* |
| 1598 | * A direct I/O write ioend starts it's life in unwritten |
| 1599 | * state in case they map an unwritten extent. This write |
| 1600 | * didn't map an unwritten extent so switch it's completion |
| 1601 | * handler. |
| 1602 | */ |
Christoph Hellwig | 5ec4fab | 2009-10-30 09:11:47 +0000 | [diff] [blame] | 1603 | ioend->io_type = IOMAP_NEW; |
David Chinner | e927af9 | 2007-06-05 16:24:36 +1000 | [diff] [blame] | 1604 | xfs_finish_ioend(ioend, 0); |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1605 | } |
| 1606 | |
| 1607 | /* |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 1608 | * blockdev_direct_IO can return an error even after the I/O |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1609 | * completion handler was called. Thus we need to protect |
| 1610 | * against double-freeing. |
| 1611 | */ |
| 1612 | iocb->private = NULL; |
| 1613 | } |
| 1614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | STATIC ssize_t |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1616 | xfs_vm_direct_IO( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | int rw, |
| 1618 | struct kiocb *iocb, |
| 1619 | const struct iovec *iov, |
| 1620 | loff_t offset, |
| 1621 | unsigned long nr_segs) |
| 1622 | { |
| 1623 | struct file *file = iocb->ki_filp; |
| 1624 | struct inode *inode = file->f_mapping->host; |
Christoph Hellwig | 6214ed4 | 2007-09-14 15:23:17 +1000 | [diff] [blame] | 1625 | struct block_device *bdev; |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1626 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | |
Christoph Hellwig | 046f168 | 2010-04-28 12:28:52 +0000 | [diff] [blame] | 1628 | bdev = xfs_find_bdev_for_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | |
Christoph Hellwig | 5fe878a | 2009-12-15 16:47:50 -0800 | [diff] [blame] | 1630 | iocb->private = xfs_alloc_ioend(inode, rw == WRITE ? |
| 1631 | IOMAP_UNWRITTEN : IOMAP_READ); |
| 1632 | |
| 1633 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, bdev, iov, |
| 1634 | offset, nr_segs, |
| 1635 | xfs_get_blocks_direct, |
| 1636 | xfs_end_io_direct); |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1637 | |
Zach Brown | 8459d86 | 2006-12-10 02:21:05 -0800 | [diff] [blame] | 1638 | if (unlikely(ret != -EIOCBQUEUED && iocb->private)) |
Christoph Hellwig | f097386 | 2005-09-05 08:22:52 +1000 | [diff] [blame] | 1639 | xfs_destroy_ioend(iocb->private); |
| 1640 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | } |
| 1642 | |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1643 | STATIC int |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1644 | xfs_vm_write_begin( |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1645 | struct file *file, |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1646 | struct address_space *mapping, |
| 1647 | loff_t pos, |
| 1648 | unsigned len, |
| 1649 | unsigned flags, |
| 1650 | struct page **pagep, |
| 1651 | void **fsdata) |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1652 | { |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1653 | *pagep = NULL; |
| 1654 | return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
| 1655 | xfs_get_blocks); |
Nathan Scott | f51623b | 2006-03-14 13:26:27 +1100 | [diff] [blame] | 1656 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | |
| 1658 | STATIC sector_t |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1659 | xfs_vm_bmap( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | struct address_space *mapping, |
| 1661 | sector_t block) |
| 1662 | { |
| 1663 | struct inode *inode = (struct inode *)mapping->host; |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 1664 | struct xfs_inode *ip = XFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | |
Lachlan McIlroy | cf441ee | 2008-02-07 16:42:19 +1100 | [diff] [blame] | 1666 | xfs_itrace_entry(XFS_I(inode)); |
Christoph Hellwig | 126468b | 2008-03-06 13:44:57 +1100 | [diff] [blame] | 1667 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 1668 | xfs_flush_pages(ip, (xfs_off_t)0, -1, 0, FI_REMAPF); |
Christoph Hellwig | 126468b | 2008-03-06 13:44:57 +1100 | [diff] [blame] | 1669 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1670 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | } |
| 1672 | |
| 1673 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1674 | xfs_vm_readpage( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | struct file *unused, |
| 1676 | struct page *page) |
| 1677 | { |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1678 | return mpage_readpage(page, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | } |
| 1680 | |
| 1681 | STATIC int |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1682 | xfs_vm_readpages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | struct file *unused, |
| 1684 | struct address_space *mapping, |
| 1685 | struct list_head *pages, |
| 1686 | unsigned nr_pages) |
| 1687 | { |
Nathan Scott | c253666 | 2006-03-29 10:44:40 +1000 | [diff] [blame] | 1688 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | } |
| 1690 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1691 | const struct address_space_operations xfs_address_space_operations = { |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1692 | .readpage = xfs_vm_readpage, |
| 1693 | .readpages = xfs_vm_readpages, |
| 1694 | .writepage = xfs_vm_writepage, |
Nathan Scott | 7d4fb40 | 2006-06-09 15:27:16 +1000 | [diff] [blame] | 1695 | .writepages = xfs_vm_writepages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | .sync_page = block_sync_page, |
Nathan Scott | 238f4c5 | 2006-03-17 17:26:25 +1100 | [diff] [blame] | 1697 | .releasepage = xfs_vm_releasepage, |
| 1698 | .invalidatepage = xfs_vm_invalidatepage, |
Nick Piggin | d79689c | 2007-10-16 01:25:06 -0700 | [diff] [blame] | 1699 | .write_begin = xfs_vm_write_begin, |
| 1700 | .write_end = generic_write_end, |
Nathan Scott | e4c573b | 2006-03-14 13:54:26 +1100 | [diff] [blame] | 1701 | .bmap = xfs_vm_bmap, |
| 1702 | .direct_IO = xfs_vm_direct_IO, |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 1703 | .migratepage = buffer_migrate_page, |
Hisashi Hifumi | bddaafa | 2009-03-29 09:53:38 +0200 | [diff] [blame] | 1704 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1705 | .error_remove_page = generic_error_remove_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | }; |