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Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
1da177e4 LT |
19 | #include "xfs_log.h" |
20 | #include "xfs_sb.h" | |
a844f451 | 21 | #include "xfs_ag.h" |
1da177e4 | 22 | #include "xfs_trans.h" |
1da177e4 LT |
23 | #include "xfs_mount.h" |
24 | #include "xfs_bmap_btree.h" | |
1da177e4 LT |
25 | #include "xfs_dinode.h" |
26 | #include "xfs_inode.h" | |
281627df | 27 | #include "xfs_inode_item.h" |
a844f451 | 28 | #include "xfs_alloc.h" |
1da177e4 | 29 | #include "xfs_error.h" |
1da177e4 | 30 | #include "xfs_iomap.h" |
739bfb2a | 31 | #include "xfs_vnodeops.h" |
0b1b213f | 32 | #include "xfs_trace.h" |
3ed3a434 | 33 | #include "xfs_bmap.h" |
a27bb332 | 34 | #include <linux/aio.h> |
5a0e3ad6 | 35 | #include <linux/gfp.h> |
1da177e4 | 36 | #include <linux/mpage.h> |
10ce4444 | 37 | #include <linux/pagevec.h> |
1da177e4 LT |
38 | #include <linux/writeback.h> |
39 | ||
0b1b213f | 40 | void |
f51623b2 NS |
41 | xfs_count_page_state( |
42 | struct page *page, | |
43 | int *delalloc, | |
f51623b2 NS |
44 | int *unwritten) |
45 | { | |
46 | struct buffer_head *bh, *head; | |
47 | ||
20cb52eb | 48 | *delalloc = *unwritten = 0; |
f51623b2 NS |
49 | |
50 | bh = head = page_buffers(page); | |
51 | do { | |
20cb52eb | 52 | if (buffer_unwritten(bh)) |
f51623b2 NS |
53 | (*unwritten) = 1; |
54 | else if (buffer_delay(bh)) | |
55 | (*delalloc) = 1; | |
56 | } while ((bh = bh->b_this_page) != head); | |
57 | } | |
58 | ||
6214ed44 CH |
59 | STATIC struct block_device * |
60 | xfs_find_bdev_for_inode( | |
046f1685 | 61 | struct inode *inode) |
6214ed44 | 62 | { |
046f1685 | 63 | struct xfs_inode *ip = XFS_I(inode); |
6214ed44 CH |
64 | struct xfs_mount *mp = ip->i_mount; |
65 | ||
71ddabb9 | 66 | if (XFS_IS_REALTIME_INODE(ip)) |
6214ed44 CH |
67 | return mp->m_rtdev_targp->bt_bdev; |
68 | else | |
69 | return mp->m_ddev_targp->bt_bdev; | |
70 | } | |
71 | ||
f6d6d4fc CH |
72 | /* |
73 | * We're now finished for good with this ioend structure. | |
74 | * Update the page state via the associated buffer_heads, | |
75 | * release holds on the inode and bio, and finally free | |
76 | * up memory. Do not use the ioend after this. | |
77 | */ | |
0829c360 CH |
78 | STATIC void |
79 | xfs_destroy_ioend( | |
80 | xfs_ioend_t *ioend) | |
81 | { | |
f6d6d4fc CH |
82 | struct buffer_head *bh, *next; |
83 | ||
84 | for (bh = ioend->io_buffer_head; bh; bh = next) { | |
85 | next = bh->b_private; | |
7d04a335 | 86 | bh->b_end_io(bh, !ioend->io_error); |
f6d6d4fc | 87 | } |
583fa586 | 88 | |
c859cdd1 | 89 | if (ioend->io_iocb) { |
4b05d09c | 90 | inode_dio_done(ioend->io_inode); |
04f658ee CH |
91 | if (ioend->io_isasync) { |
92 | aio_complete(ioend->io_iocb, ioend->io_error ? | |
93 | ioend->io_error : ioend->io_result, 0); | |
94 | } | |
c859cdd1 | 95 | } |
4a06fd26 | 96 | |
0829c360 CH |
97 | mempool_free(ioend, xfs_ioend_pool); |
98 | } | |
99 | ||
fc0063c4 CH |
100 | /* |
101 | * Fast and loose check if this write could update the on-disk inode size. | |
102 | */ | |
103 | static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend) | |
104 | { | |
105 | return ioend->io_offset + ioend->io_size > | |
106 | XFS_I(ioend->io_inode)->i_d.di_size; | |
107 | } | |
108 | ||
281627df CH |
109 | STATIC int |
110 | xfs_setfilesize_trans_alloc( | |
111 | struct xfs_ioend *ioend) | |
112 | { | |
113 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; | |
114 | struct xfs_trans *tp; | |
115 | int error; | |
116 | ||
117 | tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); | |
118 | ||
119 | error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0); | |
120 | if (error) { | |
121 | xfs_trans_cancel(tp, 0); | |
122 | return error; | |
123 | } | |
124 | ||
125 | ioend->io_append_trans = tp; | |
126 | ||
d9457dc0 | 127 | /* |
437a255a | 128 | * We may pass freeze protection with a transaction. So tell lockdep |
d9457dc0 JK |
129 | * we released it. |
130 | */ | |
131 | rwsem_release(&ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], | |
132 | 1, _THIS_IP_); | |
281627df CH |
133 | /* |
134 | * We hand off the transaction to the completion thread now, so | |
135 | * clear the flag here. | |
136 | */ | |
137 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
138 | return 0; | |
139 | } | |
140 | ||
ba87ea69 | 141 | /* |
2813d682 | 142 | * Update on-disk file size now that data has been written to disk. |
ba87ea69 | 143 | */ |
281627df | 144 | STATIC int |
ba87ea69 | 145 | xfs_setfilesize( |
aa6bf01d | 146 | struct xfs_ioend *ioend) |
ba87ea69 | 147 | { |
aa6bf01d | 148 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
281627df | 149 | struct xfs_trans *tp = ioend->io_append_trans; |
ba87ea69 | 150 | xfs_fsize_t isize; |
ba87ea69 | 151 | |
281627df | 152 | /* |
437a255a DC |
153 | * The transaction may have been allocated in the I/O submission thread, |
154 | * thus we need to mark ourselves as beeing in a transaction manually. | |
155 | * Similarly for freeze protection. | |
281627df CH |
156 | */ |
157 | current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
437a255a DC |
158 | rwsem_acquire_read(&VFS_I(ip)->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], |
159 | 0, 1, _THIS_IP_); | |
281627df | 160 | |
aa6bf01d | 161 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
6923e686 | 162 | isize = xfs_new_eof(ip, ioend->io_offset + ioend->io_size); |
281627df CH |
163 | if (!isize) { |
164 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
165 | xfs_trans_cancel(tp, 0); | |
166 | return 0; | |
ba87ea69 LM |
167 | } |
168 | ||
281627df CH |
169 | trace_xfs_setfilesize(ip, ioend->io_offset, ioend->io_size); |
170 | ||
171 | ip->i_d.di_size = isize; | |
172 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
173 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
174 | ||
175 | return xfs_trans_commit(tp, 0); | |
77d7a0c2 DC |
176 | } |
177 | ||
178 | /* | |
209fb87a | 179 | * Schedule IO completion handling on the final put of an ioend. |
fc0063c4 CH |
180 | * |
181 | * If there is no work to do we might as well call it a day and free the | |
182 | * ioend right now. | |
77d7a0c2 DC |
183 | */ |
184 | STATIC void | |
185 | xfs_finish_ioend( | |
209fb87a | 186 | struct xfs_ioend *ioend) |
77d7a0c2 DC |
187 | { |
188 | if (atomic_dec_and_test(&ioend->io_remaining)) { | |
aa6bf01d CH |
189 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
190 | ||
0d882a36 | 191 | if (ioend->io_type == XFS_IO_UNWRITTEN) |
aa6bf01d | 192 | queue_work(mp->m_unwritten_workqueue, &ioend->io_work); |
437a255a DC |
193 | else if (ioend->io_append_trans || |
194 | (ioend->io_isdirect && xfs_ioend_is_append(ioend))) | |
aa6bf01d | 195 | queue_work(mp->m_data_workqueue, &ioend->io_work); |
fc0063c4 CH |
196 | else |
197 | xfs_destroy_ioend(ioend); | |
77d7a0c2 | 198 | } |
ba87ea69 LM |
199 | } |
200 | ||
0829c360 | 201 | /* |
5ec4fabb | 202 | * IO write completion. |
f6d6d4fc CH |
203 | */ |
204 | STATIC void | |
5ec4fabb | 205 | xfs_end_io( |
77d7a0c2 | 206 | struct work_struct *work) |
0829c360 | 207 | { |
77d7a0c2 DC |
208 | xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work); |
209 | struct xfs_inode *ip = XFS_I(ioend->io_inode); | |
69418932 | 210 | int error = 0; |
ba87ea69 | 211 | |
04f658ee | 212 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
810627d9 | 213 | ioend->io_error = -EIO; |
04f658ee CH |
214 | goto done; |
215 | } | |
216 | if (ioend->io_error) | |
217 | goto done; | |
218 | ||
5ec4fabb CH |
219 | /* |
220 | * For unwritten extents we need to issue transactions to convert a | |
221 | * range to normal written extens after the data I/O has finished. | |
222 | */ | |
0d882a36 | 223 | if (ioend->io_type == XFS_IO_UNWRITTEN) { |
437a255a DC |
224 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, |
225 | ioend->io_size); | |
226 | } else if (ioend->io_isdirect && xfs_ioend_is_append(ioend)) { | |
281627df | 227 | /* |
437a255a DC |
228 | * For direct I/O we do not know if we need to allocate blocks |
229 | * or not so we can't preallocate an append transaction as that | |
230 | * results in nested reservations and log space deadlocks. Hence | |
231 | * allocate the transaction here. While this is sub-optimal and | |
232 | * can block IO completion for some time, we're stuck with doing | |
233 | * it this way until we can pass the ioend to the direct IO | |
234 | * allocation callbacks and avoid nesting that way. | |
281627df | 235 | */ |
437a255a DC |
236 | error = xfs_setfilesize_trans_alloc(ioend); |
237 | if (error) | |
04f658ee | 238 | goto done; |
437a255a | 239 | error = xfs_setfilesize(ioend); |
281627df CH |
240 | } else if (ioend->io_append_trans) { |
241 | error = xfs_setfilesize(ioend); | |
84803fb7 | 242 | } else { |
281627df | 243 | ASSERT(!xfs_ioend_is_append(ioend)); |
5ec4fabb | 244 | } |
ba87ea69 | 245 | |
04f658ee | 246 | done: |
437a255a DC |
247 | if (error) |
248 | ioend->io_error = -error; | |
aa6bf01d | 249 | xfs_destroy_ioend(ioend); |
c626d174 DC |
250 | } |
251 | ||
209fb87a CH |
252 | /* |
253 | * Call IO completion handling in caller context on the final put of an ioend. | |
254 | */ | |
255 | STATIC void | |
256 | xfs_finish_ioend_sync( | |
257 | struct xfs_ioend *ioend) | |
258 | { | |
259 | if (atomic_dec_and_test(&ioend->io_remaining)) | |
260 | xfs_end_io(&ioend->io_work); | |
261 | } | |
262 | ||
0829c360 CH |
263 | /* |
264 | * Allocate and initialise an IO completion structure. | |
265 | * We need to track unwritten extent write completion here initially. | |
266 | * We'll need to extend this for updating the ondisk inode size later | |
267 | * (vs. incore size). | |
268 | */ | |
269 | STATIC xfs_ioend_t * | |
270 | xfs_alloc_ioend( | |
f6d6d4fc CH |
271 | struct inode *inode, |
272 | unsigned int type) | |
0829c360 CH |
273 | { |
274 | xfs_ioend_t *ioend; | |
275 | ||
276 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); | |
277 | ||
278 | /* | |
279 | * Set the count to 1 initially, which will prevent an I/O | |
280 | * completion callback from happening before we have started | |
281 | * all the I/O from calling the completion routine too early. | |
282 | */ | |
283 | atomic_set(&ioend->io_remaining, 1); | |
c859cdd1 | 284 | ioend->io_isasync = 0; |
281627df | 285 | ioend->io_isdirect = 0; |
7d04a335 | 286 | ioend->io_error = 0; |
f6d6d4fc CH |
287 | ioend->io_list = NULL; |
288 | ioend->io_type = type; | |
b677c210 | 289 | ioend->io_inode = inode; |
c1a073bd | 290 | ioend->io_buffer_head = NULL; |
f6d6d4fc | 291 | ioend->io_buffer_tail = NULL; |
0829c360 CH |
292 | ioend->io_offset = 0; |
293 | ioend->io_size = 0; | |
fb511f21 CH |
294 | ioend->io_iocb = NULL; |
295 | ioend->io_result = 0; | |
281627df | 296 | ioend->io_append_trans = NULL; |
0829c360 | 297 | |
5ec4fabb | 298 | INIT_WORK(&ioend->io_work, xfs_end_io); |
0829c360 CH |
299 | return ioend; |
300 | } | |
301 | ||
1da177e4 LT |
302 | STATIC int |
303 | xfs_map_blocks( | |
304 | struct inode *inode, | |
305 | loff_t offset, | |
207d0416 | 306 | struct xfs_bmbt_irec *imap, |
a206c817 CH |
307 | int type, |
308 | int nonblocking) | |
1da177e4 | 309 | { |
a206c817 CH |
310 | struct xfs_inode *ip = XFS_I(inode); |
311 | struct xfs_mount *mp = ip->i_mount; | |
ed1e7b7e | 312 | ssize_t count = 1 << inode->i_blkbits; |
a206c817 CH |
313 | xfs_fileoff_t offset_fsb, end_fsb; |
314 | int error = 0; | |
a206c817 CH |
315 | int bmapi_flags = XFS_BMAPI_ENTIRE; |
316 | int nimaps = 1; | |
317 | ||
318 | if (XFS_FORCED_SHUTDOWN(mp)) | |
319 | return -XFS_ERROR(EIO); | |
320 | ||
0d882a36 | 321 | if (type == XFS_IO_UNWRITTEN) |
a206c817 | 322 | bmapi_flags |= XFS_BMAPI_IGSTATE; |
8ff2957d CH |
323 | |
324 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { | |
325 | if (nonblocking) | |
326 | return -XFS_ERROR(EAGAIN); | |
327 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
a206c817 CH |
328 | } |
329 | ||
8ff2957d CH |
330 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
331 | (ip->i_df.if_flags & XFS_IFEXTENTS)); | |
d2c28191 | 332 | ASSERT(offset <= mp->m_super->s_maxbytes); |
8ff2957d | 333 | |
d2c28191 DC |
334 | if (offset + count > mp->m_super->s_maxbytes) |
335 | count = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
336 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
337 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
5c8ed202 DC |
338 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
339 | imap, &nimaps, bmapi_flags); | |
8ff2957d | 340 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
a206c817 | 341 | |
8ff2957d CH |
342 | if (error) |
343 | return -XFS_ERROR(error); | |
a206c817 | 344 | |
0d882a36 | 345 | if (type == XFS_IO_DELALLOC && |
8ff2957d | 346 | (!nimaps || isnullstartblock(imap->br_startblock))) { |
a206c817 CH |
347 | error = xfs_iomap_write_allocate(ip, offset, count, imap); |
348 | if (!error) | |
349 | trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); | |
8ff2957d | 350 | return -XFS_ERROR(error); |
a206c817 CH |
351 | } |
352 | ||
8ff2957d | 353 | #ifdef DEBUG |
0d882a36 | 354 | if (type == XFS_IO_UNWRITTEN) { |
8ff2957d CH |
355 | ASSERT(nimaps); |
356 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); | |
357 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
358 | } | |
359 | #endif | |
360 | if (nimaps) | |
361 | trace_xfs_map_blocks_found(ip, offset, count, type, imap); | |
362 | return 0; | |
1da177e4 LT |
363 | } |
364 | ||
b8f82a4a | 365 | STATIC int |
558e6891 | 366 | xfs_imap_valid( |
8699bb0a | 367 | struct inode *inode, |
207d0416 | 368 | struct xfs_bmbt_irec *imap, |
558e6891 | 369 | xfs_off_t offset) |
1da177e4 | 370 | { |
558e6891 | 371 | offset >>= inode->i_blkbits; |
8699bb0a | 372 | |
558e6891 CH |
373 | return offset >= imap->br_startoff && |
374 | offset < imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
375 | } |
376 | ||
f6d6d4fc CH |
377 | /* |
378 | * BIO completion handler for buffered IO. | |
379 | */ | |
782e3b3b | 380 | STATIC void |
f6d6d4fc CH |
381 | xfs_end_bio( |
382 | struct bio *bio, | |
f6d6d4fc CH |
383 | int error) |
384 | { | |
385 | xfs_ioend_t *ioend = bio->bi_private; | |
386 | ||
f6d6d4fc | 387 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
7d04a335 | 388 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
f6d6d4fc CH |
389 | |
390 | /* Toss bio and pass work off to an xfsdatad thread */ | |
f6d6d4fc CH |
391 | bio->bi_private = NULL; |
392 | bio->bi_end_io = NULL; | |
f6d6d4fc | 393 | bio_put(bio); |
7d04a335 | 394 | |
209fb87a | 395 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
396 | } |
397 | ||
398 | STATIC void | |
399 | xfs_submit_ioend_bio( | |
06342cf8 CH |
400 | struct writeback_control *wbc, |
401 | xfs_ioend_t *ioend, | |
402 | struct bio *bio) | |
f6d6d4fc CH |
403 | { |
404 | atomic_inc(&ioend->io_remaining); | |
f6d6d4fc CH |
405 | bio->bi_private = ioend; |
406 | bio->bi_end_io = xfs_end_bio; | |
721a9602 | 407 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio); |
f6d6d4fc CH |
408 | } |
409 | ||
410 | STATIC struct bio * | |
411 | xfs_alloc_ioend_bio( | |
412 | struct buffer_head *bh) | |
413 | { | |
f6d6d4fc | 414 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
221cb251 | 415 | struct bio *bio = bio_alloc(GFP_NOIO, nvecs); |
f6d6d4fc CH |
416 | |
417 | ASSERT(bio->bi_private == NULL); | |
418 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); | |
419 | bio->bi_bdev = bh->b_bdev; | |
f6d6d4fc CH |
420 | return bio; |
421 | } | |
422 | ||
423 | STATIC void | |
424 | xfs_start_buffer_writeback( | |
425 | struct buffer_head *bh) | |
426 | { | |
427 | ASSERT(buffer_mapped(bh)); | |
428 | ASSERT(buffer_locked(bh)); | |
429 | ASSERT(!buffer_delay(bh)); | |
430 | ASSERT(!buffer_unwritten(bh)); | |
431 | ||
432 | mark_buffer_async_write(bh); | |
433 | set_buffer_uptodate(bh); | |
434 | clear_buffer_dirty(bh); | |
435 | } | |
436 | ||
437 | STATIC void | |
438 | xfs_start_page_writeback( | |
439 | struct page *page, | |
f6d6d4fc CH |
440 | int clear_dirty, |
441 | int buffers) | |
442 | { | |
443 | ASSERT(PageLocked(page)); | |
444 | ASSERT(!PageWriteback(page)); | |
f6d6d4fc | 445 | if (clear_dirty) |
92132021 DC |
446 | clear_page_dirty_for_io(page); |
447 | set_page_writeback(page); | |
f6d6d4fc | 448 | unlock_page(page); |
1f7decf6 FW |
449 | /* If no buffers on the page are to be written, finish it here */ |
450 | if (!buffers) | |
f6d6d4fc | 451 | end_page_writeback(page); |
f6d6d4fc CH |
452 | } |
453 | ||
454 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) | |
455 | { | |
456 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
457 | } | |
458 | ||
459 | /* | |
d88992f6 DC |
460 | * Submit all of the bios for all of the ioends we have saved up, covering the |
461 | * initial writepage page and also any probed pages. | |
462 | * | |
463 | * Because we may have multiple ioends spanning a page, we need to start | |
464 | * writeback on all the buffers before we submit them for I/O. If we mark the | |
465 | * buffers as we got, then we can end up with a page that only has buffers | |
466 | * marked async write and I/O complete on can occur before we mark the other | |
467 | * buffers async write. | |
468 | * | |
469 | * The end result of this is that we trip a bug in end_page_writeback() because | |
470 | * we call it twice for the one page as the code in end_buffer_async_write() | |
471 | * assumes that all buffers on the page are started at the same time. | |
472 | * | |
473 | * The fix is two passes across the ioend list - one to start writeback on the | |
c41564b5 | 474 | * buffer_heads, and then submit them for I/O on the second pass. |
7bf7f352 DC |
475 | * |
476 | * If @fail is non-zero, it means that we have a situation where some part of | |
477 | * the submission process has failed after we have marked paged for writeback | |
478 | * and unlocked them. In this situation, we need to fail the ioend chain rather | |
479 | * than submit it to IO. This typically only happens on a filesystem shutdown. | |
f6d6d4fc CH |
480 | */ |
481 | STATIC void | |
482 | xfs_submit_ioend( | |
06342cf8 | 483 | struct writeback_control *wbc, |
7bf7f352 DC |
484 | xfs_ioend_t *ioend, |
485 | int fail) | |
f6d6d4fc | 486 | { |
d88992f6 | 487 | xfs_ioend_t *head = ioend; |
f6d6d4fc CH |
488 | xfs_ioend_t *next; |
489 | struct buffer_head *bh; | |
490 | struct bio *bio; | |
491 | sector_t lastblock = 0; | |
492 | ||
d88992f6 DC |
493 | /* Pass 1 - start writeback */ |
494 | do { | |
495 | next = ioend->io_list; | |
221cb251 | 496 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) |
d88992f6 | 497 | xfs_start_buffer_writeback(bh); |
d88992f6 DC |
498 | } while ((ioend = next) != NULL); |
499 | ||
500 | /* Pass 2 - submit I/O */ | |
501 | ioend = head; | |
f6d6d4fc CH |
502 | do { |
503 | next = ioend->io_list; | |
504 | bio = NULL; | |
505 | ||
7bf7f352 DC |
506 | /* |
507 | * If we are failing the IO now, just mark the ioend with an | |
508 | * error and finish it. This will run IO completion immediately | |
509 | * as there is only one reference to the ioend at this point in | |
510 | * time. | |
511 | */ | |
512 | if (fail) { | |
513 | ioend->io_error = -fail; | |
514 | xfs_finish_ioend(ioend); | |
515 | continue; | |
516 | } | |
517 | ||
f6d6d4fc | 518 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { |
f6d6d4fc CH |
519 | |
520 | if (!bio) { | |
521 | retry: | |
522 | bio = xfs_alloc_ioend_bio(bh); | |
523 | } else if (bh->b_blocknr != lastblock + 1) { | |
06342cf8 | 524 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
525 | goto retry; |
526 | } | |
527 | ||
528 | if (bio_add_buffer(bio, bh) != bh->b_size) { | |
06342cf8 | 529 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
530 | goto retry; |
531 | } | |
532 | ||
533 | lastblock = bh->b_blocknr; | |
534 | } | |
535 | if (bio) | |
06342cf8 | 536 | xfs_submit_ioend_bio(wbc, ioend, bio); |
209fb87a | 537 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
538 | } while ((ioend = next) != NULL); |
539 | } | |
540 | ||
541 | /* | |
542 | * Cancel submission of all buffer_heads so far in this endio. | |
543 | * Toss the endio too. Only ever called for the initial page | |
544 | * in a writepage request, so only ever one page. | |
545 | */ | |
546 | STATIC void | |
547 | xfs_cancel_ioend( | |
548 | xfs_ioend_t *ioend) | |
549 | { | |
550 | xfs_ioend_t *next; | |
551 | struct buffer_head *bh, *next_bh; | |
552 | ||
553 | do { | |
554 | next = ioend->io_list; | |
555 | bh = ioend->io_buffer_head; | |
556 | do { | |
557 | next_bh = bh->b_private; | |
558 | clear_buffer_async_write(bh); | |
559 | unlock_buffer(bh); | |
560 | } while ((bh = next_bh) != NULL); | |
561 | ||
f6d6d4fc CH |
562 | mempool_free(ioend, xfs_ioend_pool); |
563 | } while ((ioend = next) != NULL); | |
564 | } | |
565 | ||
566 | /* | |
567 | * Test to see if we've been building up a completion structure for | |
568 | * earlier buffers -- if so, we try to append to this ioend if we | |
569 | * can, otherwise we finish off any current ioend and start another. | |
570 | * Return true if we've finished the given ioend. | |
571 | */ | |
572 | STATIC void | |
573 | xfs_add_to_ioend( | |
574 | struct inode *inode, | |
575 | struct buffer_head *bh, | |
7336cea8 | 576 | xfs_off_t offset, |
f6d6d4fc CH |
577 | unsigned int type, |
578 | xfs_ioend_t **result, | |
579 | int need_ioend) | |
580 | { | |
581 | xfs_ioend_t *ioend = *result; | |
582 | ||
583 | if (!ioend || need_ioend || type != ioend->io_type) { | |
584 | xfs_ioend_t *previous = *result; | |
f6d6d4fc | 585 | |
f6d6d4fc CH |
586 | ioend = xfs_alloc_ioend(inode, type); |
587 | ioend->io_offset = offset; | |
588 | ioend->io_buffer_head = bh; | |
589 | ioend->io_buffer_tail = bh; | |
590 | if (previous) | |
591 | previous->io_list = ioend; | |
592 | *result = ioend; | |
593 | } else { | |
594 | ioend->io_buffer_tail->b_private = bh; | |
595 | ioend->io_buffer_tail = bh; | |
596 | } | |
597 | ||
598 | bh->b_private = NULL; | |
599 | ioend->io_size += bh->b_size; | |
600 | } | |
601 | ||
87cbc49c NS |
602 | STATIC void |
603 | xfs_map_buffer( | |
046f1685 | 604 | struct inode *inode, |
87cbc49c | 605 | struct buffer_head *bh, |
207d0416 | 606 | struct xfs_bmbt_irec *imap, |
046f1685 | 607 | xfs_off_t offset) |
87cbc49c NS |
608 | { |
609 | sector_t bn; | |
8699bb0a | 610 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
207d0416 CH |
611 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff); |
612 | xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), imap->br_startblock); | |
87cbc49c | 613 | |
207d0416 CH |
614 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
615 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
87cbc49c | 616 | |
e513182d | 617 | bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) + |
8699bb0a | 618 | ((offset - iomap_offset) >> inode->i_blkbits); |
87cbc49c | 619 | |
046f1685 | 620 | ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode))); |
87cbc49c NS |
621 | |
622 | bh->b_blocknr = bn; | |
623 | set_buffer_mapped(bh); | |
624 | } | |
625 | ||
1da177e4 LT |
626 | STATIC void |
627 | xfs_map_at_offset( | |
046f1685 | 628 | struct inode *inode, |
1da177e4 | 629 | struct buffer_head *bh, |
207d0416 | 630 | struct xfs_bmbt_irec *imap, |
046f1685 | 631 | xfs_off_t offset) |
1da177e4 | 632 | { |
207d0416 CH |
633 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
634 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
1da177e4 | 635 | |
207d0416 | 636 | xfs_map_buffer(inode, bh, imap, offset); |
1da177e4 LT |
637 | set_buffer_mapped(bh); |
638 | clear_buffer_delay(bh); | |
f6d6d4fc | 639 | clear_buffer_unwritten(bh); |
1da177e4 LT |
640 | } |
641 | ||
1da177e4 | 642 | /* |
10ce4444 CH |
643 | * Test if a given page is suitable for writing as part of an unwritten |
644 | * or delayed allocate extent. | |
1da177e4 | 645 | */ |
10ce4444 | 646 | STATIC int |
6ffc4db5 | 647 | xfs_check_page_type( |
10ce4444 | 648 | struct page *page, |
f6d6d4fc | 649 | unsigned int type) |
1da177e4 | 650 | { |
1da177e4 | 651 | if (PageWriteback(page)) |
10ce4444 | 652 | return 0; |
1da177e4 LT |
653 | |
654 | if (page->mapping && page_has_buffers(page)) { | |
655 | struct buffer_head *bh, *head; | |
656 | int acceptable = 0; | |
657 | ||
658 | bh = head = page_buffers(page); | |
659 | do { | |
f6d6d4fc | 660 | if (buffer_unwritten(bh)) |
0d882a36 | 661 | acceptable += (type == XFS_IO_UNWRITTEN); |
f6d6d4fc | 662 | else if (buffer_delay(bh)) |
0d882a36 | 663 | acceptable += (type == XFS_IO_DELALLOC); |
2ddee844 | 664 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
0d882a36 | 665 | acceptable += (type == XFS_IO_OVERWRITE); |
f6d6d4fc | 666 | else |
1da177e4 | 667 | break; |
1da177e4 LT |
668 | } while ((bh = bh->b_this_page) != head); |
669 | ||
670 | if (acceptable) | |
10ce4444 | 671 | return 1; |
1da177e4 LT |
672 | } |
673 | ||
10ce4444 | 674 | return 0; |
1da177e4 LT |
675 | } |
676 | ||
1da177e4 LT |
677 | /* |
678 | * Allocate & map buffers for page given the extent map. Write it out. | |
679 | * except for the original page of a writepage, this is called on | |
680 | * delalloc/unwritten pages only, for the original page it is possible | |
681 | * that the page has no mapping at all. | |
682 | */ | |
f6d6d4fc | 683 | STATIC int |
1da177e4 LT |
684 | xfs_convert_page( |
685 | struct inode *inode, | |
686 | struct page *page, | |
10ce4444 | 687 | loff_t tindex, |
207d0416 | 688 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 689 | xfs_ioend_t **ioendp, |
2fa24f92 | 690 | struct writeback_control *wbc) |
1da177e4 | 691 | { |
f6d6d4fc | 692 | struct buffer_head *bh, *head; |
9260dc6b CH |
693 | xfs_off_t end_offset; |
694 | unsigned long p_offset; | |
f6d6d4fc | 695 | unsigned int type; |
24e17b5f | 696 | int len, page_dirty; |
f6d6d4fc | 697 | int count = 0, done = 0, uptodate = 1; |
9260dc6b | 698 | xfs_off_t offset = page_offset(page); |
1da177e4 | 699 | |
10ce4444 CH |
700 | if (page->index != tindex) |
701 | goto fail; | |
529ae9aa | 702 | if (!trylock_page(page)) |
10ce4444 CH |
703 | goto fail; |
704 | if (PageWriteback(page)) | |
705 | goto fail_unlock_page; | |
706 | if (page->mapping != inode->i_mapping) | |
707 | goto fail_unlock_page; | |
6ffc4db5 | 708 | if (!xfs_check_page_type(page, (*ioendp)->io_type)) |
10ce4444 CH |
709 | goto fail_unlock_page; |
710 | ||
24e17b5f NS |
711 | /* |
712 | * page_dirty is initially a count of buffers on the page before | |
c41564b5 | 713 | * EOF and is decremented as we move each into a cleanable state. |
9260dc6b CH |
714 | * |
715 | * Derivation: | |
716 | * | |
717 | * End offset is the highest offset that this page should represent. | |
718 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
719 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
720 | * hence give us the correct page_dirty count. On any other page, | |
721 | * it will be zero and in that case we need page_dirty to be the | |
722 | * count of buffers on the page. | |
24e17b5f | 723 | */ |
9260dc6b CH |
724 | end_offset = min_t(unsigned long long, |
725 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, | |
726 | i_size_read(inode)); | |
727 | ||
24e17b5f | 728 | len = 1 << inode->i_blkbits; |
9260dc6b CH |
729 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
730 | PAGE_CACHE_SIZE); | |
731 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
732 | page_dirty = p_offset / len; | |
24e17b5f | 733 | |
1da177e4 LT |
734 | bh = head = page_buffers(page); |
735 | do { | |
9260dc6b | 736 | if (offset >= end_offset) |
1da177e4 | 737 | break; |
f6d6d4fc CH |
738 | if (!buffer_uptodate(bh)) |
739 | uptodate = 0; | |
740 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { | |
741 | done = 1; | |
1da177e4 | 742 | continue; |
f6d6d4fc CH |
743 | } |
744 | ||
2fa24f92 CH |
745 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
746 | buffer_mapped(bh)) { | |
9260dc6b | 747 | if (buffer_unwritten(bh)) |
0d882a36 | 748 | type = XFS_IO_UNWRITTEN; |
2fa24f92 | 749 | else if (buffer_delay(bh)) |
0d882a36 | 750 | type = XFS_IO_DELALLOC; |
2fa24f92 | 751 | else |
0d882a36 | 752 | type = XFS_IO_OVERWRITE; |
9260dc6b | 753 | |
558e6891 | 754 | if (!xfs_imap_valid(inode, imap, offset)) { |
f6d6d4fc | 755 | done = 1; |
9260dc6b CH |
756 | continue; |
757 | } | |
758 | ||
ecff71e6 | 759 | lock_buffer(bh); |
0d882a36 | 760 | if (type != XFS_IO_OVERWRITE) |
2fa24f92 | 761 | xfs_map_at_offset(inode, bh, imap, offset); |
89f3b363 CH |
762 | xfs_add_to_ioend(inode, bh, offset, type, |
763 | ioendp, done); | |
764 | ||
9260dc6b CH |
765 | page_dirty--; |
766 | count++; | |
767 | } else { | |
2fa24f92 | 768 | done = 1; |
1da177e4 | 769 | } |
7336cea8 | 770 | } while (offset += len, (bh = bh->b_this_page) != head); |
1da177e4 | 771 | |
f6d6d4fc CH |
772 | if (uptodate && bh == head) |
773 | SetPageUptodate(page); | |
774 | ||
89f3b363 | 775 | if (count) { |
efceab1d DC |
776 | if (--wbc->nr_to_write <= 0 && |
777 | wbc->sync_mode == WB_SYNC_NONE) | |
89f3b363 | 778 | done = 1; |
1da177e4 | 779 | } |
89f3b363 | 780 | xfs_start_page_writeback(page, !page_dirty, count); |
f6d6d4fc CH |
781 | |
782 | return done; | |
10ce4444 CH |
783 | fail_unlock_page: |
784 | unlock_page(page); | |
785 | fail: | |
786 | return 1; | |
1da177e4 LT |
787 | } |
788 | ||
789 | /* | |
790 | * Convert & write out a cluster of pages in the same extent as defined | |
791 | * by mp and following the start page. | |
792 | */ | |
793 | STATIC void | |
794 | xfs_cluster_write( | |
795 | struct inode *inode, | |
796 | pgoff_t tindex, | |
207d0416 | 797 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 798 | xfs_ioend_t **ioendp, |
1da177e4 | 799 | struct writeback_control *wbc, |
1da177e4 LT |
800 | pgoff_t tlast) |
801 | { | |
10ce4444 CH |
802 | struct pagevec pvec; |
803 | int done = 0, i; | |
1da177e4 | 804 | |
10ce4444 CH |
805 | pagevec_init(&pvec, 0); |
806 | while (!done && tindex <= tlast) { | |
807 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
808 | ||
809 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
1da177e4 | 810 | break; |
10ce4444 CH |
811 | |
812 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
813 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, | |
2fa24f92 | 814 | imap, ioendp, wbc); |
10ce4444 CH |
815 | if (done) |
816 | break; | |
817 | } | |
818 | ||
819 | pagevec_release(&pvec); | |
820 | cond_resched(); | |
1da177e4 LT |
821 | } |
822 | } | |
823 | ||
3ed3a434 DC |
824 | STATIC void |
825 | xfs_vm_invalidatepage( | |
826 | struct page *page, | |
827 | unsigned long offset) | |
828 | { | |
829 | trace_xfs_invalidatepage(page->mapping->host, page, offset); | |
830 | block_invalidatepage(page, offset); | |
831 | } | |
832 | ||
833 | /* | |
834 | * If the page has delalloc buffers on it, we need to punch them out before we | |
835 | * invalidate the page. If we don't, we leave a stale delalloc mapping on the | |
836 | * inode that can trip a BUG() in xfs_get_blocks() later on if a direct IO read | |
837 | * is done on that same region - the delalloc extent is returned when none is | |
838 | * supposed to be there. | |
839 | * | |
840 | * We prevent this by truncating away the delalloc regions on the page before | |
841 | * invalidating it. Because they are delalloc, we can do this without needing a | |
842 | * transaction. Indeed - if we get ENOSPC errors, we have to be able to do this | |
843 | * truncation without a transaction as there is no space left for block | |
844 | * reservation (typically why we see a ENOSPC in writeback). | |
845 | * | |
846 | * This is not a performance critical path, so for now just do the punching a | |
847 | * buffer head at a time. | |
848 | */ | |
849 | STATIC void | |
850 | xfs_aops_discard_page( | |
851 | struct page *page) | |
852 | { | |
853 | struct inode *inode = page->mapping->host; | |
854 | struct xfs_inode *ip = XFS_I(inode); | |
855 | struct buffer_head *bh, *head; | |
856 | loff_t offset = page_offset(page); | |
3ed3a434 | 857 | |
0d882a36 | 858 | if (!xfs_check_page_type(page, XFS_IO_DELALLOC)) |
3ed3a434 DC |
859 | goto out_invalidate; |
860 | ||
e8c3753c DC |
861 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
862 | goto out_invalidate; | |
863 | ||
4f10700a | 864 | xfs_alert(ip->i_mount, |
3ed3a434 DC |
865 | "page discard on page %p, inode 0x%llx, offset %llu.", |
866 | page, ip->i_ino, offset); | |
867 | ||
868 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
869 | bh = head = page_buffers(page); | |
870 | do { | |
3ed3a434 | 871 | int error; |
c726de44 | 872 | xfs_fileoff_t start_fsb; |
3ed3a434 DC |
873 | |
874 | if (!buffer_delay(bh)) | |
875 | goto next_buffer; | |
876 | ||
c726de44 DC |
877 | start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); |
878 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1); | |
3ed3a434 DC |
879 | if (error) { |
880 | /* something screwed, just bail */ | |
e8c3753c | 881 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
4f10700a | 882 | xfs_alert(ip->i_mount, |
3ed3a434 | 883 | "page discard unable to remove delalloc mapping."); |
e8c3753c | 884 | } |
3ed3a434 DC |
885 | break; |
886 | } | |
887 | next_buffer: | |
c726de44 | 888 | offset += 1 << inode->i_blkbits; |
3ed3a434 DC |
889 | |
890 | } while ((bh = bh->b_this_page) != head); | |
891 | ||
892 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
893 | out_invalidate: | |
894 | xfs_vm_invalidatepage(page, 0); | |
895 | return; | |
896 | } | |
897 | ||
1da177e4 | 898 | /* |
89f3b363 CH |
899 | * Write out a dirty page. |
900 | * | |
901 | * For delalloc space on the page we need to allocate space and flush it. | |
902 | * For unwritten space on the page we need to start the conversion to | |
903 | * regular allocated space. | |
89f3b363 | 904 | * For any other dirty buffer heads on the page we should flush them. |
1da177e4 | 905 | */ |
1da177e4 | 906 | STATIC int |
89f3b363 CH |
907 | xfs_vm_writepage( |
908 | struct page *page, | |
909 | struct writeback_control *wbc) | |
1da177e4 | 910 | { |
89f3b363 | 911 | struct inode *inode = page->mapping->host; |
f6d6d4fc | 912 | struct buffer_head *bh, *head; |
207d0416 | 913 | struct xfs_bmbt_irec imap; |
f6d6d4fc | 914 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
1da177e4 | 915 | loff_t offset; |
f6d6d4fc | 916 | unsigned int type; |
1da177e4 | 917 | __uint64_t end_offset; |
bd1556a1 | 918 | pgoff_t end_index, last_index; |
ed1e7b7e | 919 | ssize_t len; |
a206c817 | 920 | int err, imap_valid = 0, uptodate = 1; |
89f3b363 | 921 | int count = 0; |
a206c817 | 922 | int nonblocking = 0; |
89f3b363 CH |
923 | |
924 | trace_xfs_writepage(inode, page, 0); | |
925 | ||
20cb52eb CH |
926 | ASSERT(page_has_buffers(page)); |
927 | ||
89f3b363 CH |
928 | /* |
929 | * Refuse to write the page out if we are called from reclaim context. | |
930 | * | |
d4f7a5cb CH |
931 | * This avoids stack overflows when called from deeply used stacks in |
932 | * random callers for direct reclaim or memcg reclaim. We explicitly | |
933 | * allow reclaim from kswapd as the stack usage there is relatively low. | |
89f3b363 | 934 | * |
94054fa3 MG |
935 | * This should never happen except in the case of a VM regression so |
936 | * warn about it. | |
89f3b363 | 937 | */ |
94054fa3 MG |
938 | if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == |
939 | PF_MEMALLOC)) | |
b5420f23 | 940 | goto redirty; |
1da177e4 | 941 | |
89f3b363 | 942 | /* |
680a647b CH |
943 | * Given that we do not allow direct reclaim to call us, we should |
944 | * never be called while in a filesystem transaction. | |
89f3b363 | 945 | */ |
680a647b | 946 | if (WARN_ON(current->flags & PF_FSTRANS)) |
b5420f23 | 947 | goto redirty; |
89f3b363 | 948 | |
1da177e4 LT |
949 | /* Is this page beyond the end of the file? */ |
950 | offset = i_size_read(inode); | |
951 | end_index = offset >> PAGE_CACHE_SHIFT; | |
952 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; | |
953 | if (page->index >= end_index) { | |
6b7a03f0 CH |
954 | unsigned offset_into_page = offset & (PAGE_CACHE_SIZE - 1); |
955 | ||
956 | /* | |
ff9a28f6 JK |
957 | * Skip the page if it is fully outside i_size, e.g. due to a |
958 | * truncate operation that is in progress. We must redirty the | |
959 | * page so that reclaim stops reclaiming it. Otherwise | |
960 | * xfs_vm_releasepage() is called on it and gets confused. | |
6b7a03f0 | 961 | */ |
ff9a28f6 JK |
962 | if (page->index >= end_index + 1 || offset_into_page == 0) |
963 | goto redirty; | |
6b7a03f0 CH |
964 | |
965 | /* | |
966 | * The page straddles i_size. It must be zeroed out on each | |
967 | * and every writepage invocation because it may be mmapped. | |
968 | * "A file is mapped in multiples of the page size. For a file | |
969 | * that is not a multiple of the page size, the remaining | |
970 | * memory is zeroed when mapped, and writes to that region are | |
971 | * not written out to the file." | |
972 | */ | |
973 | zero_user_segment(page, offset_into_page, PAGE_CACHE_SIZE); | |
1da177e4 LT |
974 | } |
975 | ||
f6d6d4fc | 976 | end_offset = min_t(unsigned long long, |
20cb52eb CH |
977 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
978 | offset); | |
24e17b5f | 979 | len = 1 << inode->i_blkbits; |
24e17b5f | 980 | |
24e17b5f | 981 | bh = head = page_buffers(page); |
f6d6d4fc | 982 | offset = page_offset(page); |
0d882a36 | 983 | type = XFS_IO_OVERWRITE; |
a206c817 | 984 | |
dbcdde3e | 985 | if (wbc->sync_mode == WB_SYNC_NONE) |
a206c817 | 986 | nonblocking = 1; |
f6d6d4fc | 987 | |
1da177e4 | 988 | do { |
6ac7248e CH |
989 | int new_ioend = 0; |
990 | ||
1da177e4 LT |
991 | if (offset >= end_offset) |
992 | break; | |
993 | if (!buffer_uptodate(bh)) | |
994 | uptodate = 0; | |
1da177e4 | 995 | |
3d9b02e3 | 996 | /* |
ece413f5 CH |
997 | * set_page_dirty dirties all buffers in a page, independent |
998 | * of their state. The dirty state however is entirely | |
999 | * meaningless for holes (!mapped && uptodate), so skip | |
1000 | * buffers covering holes here. | |
3d9b02e3 ES |
1001 | */ |
1002 | if (!buffer_mapped(bh) && buffer_uptodate(bh)) { | |
3d9b02e3 ES |
1003 | imap_valid = 0; |
1004 | continue; | |
1005 | } | |
1006 | ||
aeea1b1f | 1007 | if (buffer_unwritten(bh)) { |
0d882a36 AR |
1008 | if (type != XFS_IO_UNWRITTEN) { |
1009 | type = XFS_IO_UNWRITTEN; | |
aeea1b1f | 1010 | imap_valid = 0; |
1da177e4 | 1011 | } |
aeea1b1f | 1012 | } else if (buffer_delay(bh)) { |
0d882a36 AR |
1013 | if (type != XFS_IO_DELALLOC) { |
1014 | type = XFS_IO_DELALLOC; | |
aeea1b1f | 1015 | imap_valid = 0; |
1da177e4 | 1016 | } |
89f3b363 | 1017 | } else if (buffer_uptodate(bh)) { |
0d882a36 AR |
1018 | if (type != XFS_IO_OVERWRITE) { |
1019 | type = XFS_IO_OVERWRITE; | |
85da94c6 CH |
1020 | imap_valid = 0; |
1021 | } | |
aeea1b1f | 1022 | } else { |
7d0fa3ec | 1023 | if (PageUptodate(page)) |
aeea1b1f | 1024 | ASSERT(buffer_mapped(bh)); |
7d0fa3ec AR |
1025 | /* |
1026 | * This buffer is not uptodate and will not be | |
1027 | * written to disk. Ensure that we will put any | |
1028 | * subsequent writeable buffers into a new | |
1029 | * ioend. | |
1030 | */ | |
1031 | imap_valid = 0; | |
aeea1b1f CH |
1032 | continue; |
1033 | } | |
d5cb48aa | 1034 | |
aeea1b1f CH |
1035 | if (imap_valid) |
1036 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1037 | if (!imap_valid) { | |
1038 | /* | |
1039 | * If we didn't have a valid mapping then we need to | |
1040 | * put the new mapping into a separate ioend structure. | |
1041 | * This ensures non-contiguous extents always have | |
1042 | * separate ioends, which is particularly important | |
1043 | * for unwritten extent conversion at I/O completion | |
1044 | * time. | |
1045 | */ | |
1046 | new_ioend = 1; | |
1047 | err = xfs_map_blocks(inode, offset, &imap, type, | |
1048 | nonblocking); | |
1049 | if (err) | |
1050 | goto error; | |
1051 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1052 | } | |
1053 | if (imap_valid) { | |
ecff71e6 | 1054 | lock_buffer(bh); |
0d882a36 | 1055 | if (type != XFS_IO_OVERWRITE) |
aeea1b1f CH |
1056 | xfs_map_at_offset(inode, bh, &imap, offset); |
1057 | xfs_add_to_ioend(inode, bh, offset, type, &ioend, | |
1058 | new_ioend); | |
1059 | count++; | |
1da177e4 | 1060 | } |
f6d6d4fc CH |
1061 | |
1062 | if (!iohead) | |
1063 | iohead = ioend; | |
1064 | ||
1065 | } while (offset += len, ((bh = bh->b_this_page) != head)); | |
1da177e4 LT |
1066 | |
1067 | if (uptodate && bh == head) | |
1068 | SetPageUptodate(page); | |
1069 | ||
89f3b363 | 1070 | xfs_start_page_writeback(page, 1, count); |
1da177e4 | 1071 | |
7bf7f352 DC |
1072 | /* if there is no IO to be submitted for this page, we are done */ |
1073 | if (!ioend) | |
1074 | return 0; | |
1075 | ||
1076 | ASSERT(iohead); | |
1077 | ||
1078 | /* | |
1079 | * Any errors from this point onwards need tobe reported through the IO | |
1080 | * completion path as we have marked the initial page as under writeback | |
1081 | * and unlocked it. | |
1082 | */ | |
1083 | if (imap_valid) { | |
bd1556a1 CH |
1084 | xfs_off_t end_index; |
1085 | ||
1086 | end_index = imap.br_startoff + imap.br_blockcount; | |
1087 | ||
1088 | /* to bytes */ | |
1089 | end_index <<= inode->i_blkbits; | |
1090 | ||
1091 | /* to pages */ | |
1092 | end_index = (end_index - 1) >> PAGE_CACHE_SHIFT; | |
1093 | ||
1094 | /* check against file size */ | |
1095 | if (end_index > last_index) | |
1096 | end_index = last_index; | |
8699bb0a | 1097 | |
207d0416 | 1098 | xfs_cluster_write(inode, page->index + 1, &imap, &ioend, |
2fa24f92 | 1099 | wbc, end_index); |
1da177e4 LT |
1100 | } |
1101 | ||
281627df | 1102 | |
7bf7f352 DC |
1103 | /* |
1104 | * Reserve log space if we might write beyond the on-disk inode size. | |
1105 | */ | |
1106 | err = 0; | |
1107 | if (ioend->io_type != XFS_IO_UNWRITTEN && xfs_ioend_is_append(ioend)) | |
1108 | err = xfs_setfilesize_trans_alloc(ioend); | |
1109 | ||
1110 | xfs_submit_ioend(wbc, iohead, err); | |
f6d6d4fc | 1111 | |
89f3b363 | 1112 | return 0; |
1da177e4 LT |
1113 | |
1114 | error: | |
f6d6d4fc CH |
1115 | if (iohead) |
1116 | xfs_cancel_ioend(iohead); | |
1da177e4 | 1117 | |
b5420f23 CH |
1118 | if (err == -EAGAIN) |
1119 | goto redirty; | |
1120 | ||
20cb52eb | 1121 | xfs_aops_discard_page(page); |
89f3b363 CH |
1122 | ClearPageUptodate(page); |
1123 | unlock_page(page); | |
1da177e4 | 1124 | return err; |
f51623b2 | 1125 | |
b5420f23 | 1126 | redirty: |
f51623b2 NS |
1127 | redirty_page_for_writepage(wbc, page); |
1128 | unlock_page(page); | |
1129 | return 0; | |
f51623b2 NS |
1130 | } |
1131 | ||
7d4fb40a NS |
1132 | STATIC int |
1133 | xfs_vm_writepages( | |
1134 | struct address_space *mapping, | |
1135 | struct writeback_control *wbc) | |
1136 | { | |
b3aea4ed | 1137 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
7d4fb40a NS |
1138 | return generic_writepages(mapping, wbc); |
1139 | } | |
1140 | ||
f51623b2 NS |
1141 | /* |
1142 | * Called to move a page into cleanable state - and from there | |
89f3b363 | 1143 | * to be released. The page should already be clean. We always |
f51623b2 NS |
1144 | * have buffer heads in this call. |
1145 | * | |
89f3b363 | 1146 | * Returns 1 if the page is ok to release, 0 otherwise. |
f51623b2 NS |
1147 | */ |
1148 | STATIC int | |
238f4c54 | 1149 | xfs_vm_releasepage( |
f51623b2 NS |
1150 | struct page *page, |
1151 | gfp_t gfp_mask) | |
1152 | { | |
20cb52eb | 1153 | int delalloc, unwritten; |
f51623b2 | 1154 | |
89f3b363 | 1155 | trace_xfs_releasepage(page->mapping->host, page, 0); |
238f4c54 | 1156 | |
20cb52eb | 1157 | xfs_count_page_state(page, &delalloc, &unwritten); |
f51623b2 | 1158 | |
89f3b363 | 1159 | if (WARN_ON(delalloc)) |
f51623b2 | 1160 | return 0; |
89f3b363 | 1161 | if (WARN_ON(unwritten)) |
f51623b2 NS |
1162 | return 0; |
1163 | ||
f51623b2 NS |
1164 | return try_to_free_buffers(page); |
1165 | } | |
1166 | ||
1da177e4 | 1167 | STATIC int |
c2536668 | 1168 | __xfs_get_blocks( |
1da177e4 LT |
1169 | struct inode *inode, |
1170 | sector_t iblock, | |
1da177e4 LT |
1171 | struct buffer_head *bh_result, |
1172 | int create, | |
f2bde9b8 | 1173 | int direct) |
1da177e4 | 1174 | { |
a206c817 CH |
1175 | struct xfs_inode *ip = XFS_I(inode); |
1176 | struct xfs_mount *mp = ip->i_mount; | |
1177 | xfs_fileoff_t offset_fsb, end_fsb; | |
1178 | int error = 0; | |
1179 | int lockmode = 0; | |
207d0416 | 1180 | struct xfs_bmbt_irec imap; |
a206c817 | 1181 | int nimaps = 1; |
fdc7ed75 NS |
1182 | xfs_off_t offset; |
1183 | ssize_t size; | |
207d0416 | 1184 | int new = 0; |
a206c817 CH |
1185 | |
1186 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1187 | return -XFS_ERROR(EIO); | |
1da177e4 | 1188 | |
fdc7ed75 | 1189 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
c2536668 NS |
1190 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
1191 | size = bh_result->b_size; | |
364f358a LM |
1192 | |
1193 | if (!create && direct && offset >= i_size_read(inode)) | |
1194 | return 0; | |
1195 | ||
507630b2 DC |
1196 | /* |
1197 | * Direct I/O is usually done on preallocated files, so try getting | |
1198 | * a block mapping without an exclusive lock first. For buffered | |
1199 | * writes we already have the exclusive iolock anyway, so avoiding | |
1200 | * a lock roundtrip here by taking the ilock exclusive from the | |
1201 | * beginning is a useful micro optimization. | |
1202 | */ | |
1203 | if (create && !direct) { | |
a206c817 CH |
1204 | lockmode = XFS_ILOCK_EXCL; |
1205 | xfs_ilock(ip, lockmode); | |
1206 | } else { | |
1207 | lockmode = xfs_ilock_map_shared(ip); | |
1208 | } | |
f2bde9b8 | 1209 | |
d2c28191 DC |
1210 | ASSERT(offset <= mp->m_super->s_maxbytes); |
1211 | if (offset + size > mp->m_super->s_maxbytes) | |
1212 | size = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
1213 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); |
1214 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1215 | ||
5c8ed202 DC |
1216 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
1217 | &imap, &nimaps, XFS_BMAPI_ENTIRE); | |
1da177e4 | 1218 | if (error) |
a206c817 CH |
1219 | goto out_unlock; |
1220 | ||
1221 | if (create && | |
1222 | (!nimaps || | |
1223 | (imap.br_startblock == HOLESTARTBLOCK || | |
1224 | imap.br_startblock == DELAYSTARTBLOCK))) { | |
aff3a9ed | 1225 | if (direct || xfs_get_extsz_hint(ip)) { |
507630b2 DC |
1226 | /* |
1227 | * Drop the ilock in preparation for starting the block | |
1228 | * allocation transaction. It will be retaken | |
1229 | * exclusively inside xfs_iomap_write_direct for the | |
1230 | * actual allocation. | |
1231 | */ | |
1232 | xfs_iunlock(ip, lockmode); | |
a206c817 CH |
1233 | error = xfs_iomap_write_direct(ip, offset, size, |
1234 | &imap, nimaps); | |
507630b2 DC |
1235 | if (error) |
1236 | return -error; | |
d3bc815a | 1237 | new = 1; |
a206c817 | 1238 | } else { |
507630b2 DC |
1239 | /* |
1240 | * Delalloc reservations do not require a transaction, | |
d3bc815a DC |
1241 | * we can go on without dropping the lock here. If we |
1242 | * are allocating a new delalloc block, make sure that | |
1243 | * we set the new flag so that we mark the buffer new so | |
1244 | * that we know that it is newly allocated if the write | |
1245 | * fails. | |
507630b2 | 1246 | */ |
d3bc815a DC |
1247 | if (nimaps && imap.br_startblock == HOLESTARTBLOCK) |
1248 | new = 1; | |
a206c817 | 1249 | error = xfs_iomap_write_delay(ip, offset, size, &imap); |
507630b2 DC |
1250 | if (error) |
1251 | goto out_unlock; | |
1252 | ||
1253 | xfs_iunlock(ip, lockmode); | |
a206c817 | 1254 | } |
a206c817 CH |
1255 | |
1256 | trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap); | |
1257 | } else if (nimaps) { | |
1258 | trace_xfs_get_blocks_found(ip, offset, size, 0, &imap); | |
507630b2 | 1259 | xfs_iunlock(ip, lockmode); |
a206c817 CH |
1260 | } else { |
1261 | trace_xfs_get_blocks_notfound(ip, offset, size); | |
1262 | goto out_unlock; | |
1263 | } | |
1da177e4 | 1264 | |
207d0416 CH |
1265 | if (imap.br_startblock != HOLESTARTBLOCK && |
1266 | imap.br_startblock != DELAYSTARTBLOCK) { | |
87cbc49c NS |
1267 | /* |
1268 | * For unwritten extents do not report a disk address on | |
1da177e4 LT |
1269 | * the read case (treat as if we're reading into a hole). |
1270 | */ | |
207d0416 CH |
1271 | if (create || !ISUNWRITTEN(&imap)) |
1272 | xfs_map_buffer(inode, bh_result, &imap, offset); | |
1273 | if (create && ISUNWRITTEN(&imap)) { | |
1da177e4 LT |
1274 | if (direct) |
1275 | bh_result->b_private = inode; | |
1276 | set_buffer_unwritten(bh_result); | |
1da177e4 LT |
1277 | } |
1278 | } | |
1279 | ||
c2536668 NS |
1280 | /* |
1281 | * If this is a realtime file, data may be on a different device. | |
1282 | * to that pointed to from the buffer_head b_bdev currently. | |
1283 | */ | |
046f1685 | 1284 | bh_result->b_bdev = xfs_find_bdev_for_inode(inode); |
1da177e4 | 1285 | |
c2536668 | 1286 | /* |
549054af DC |
1287 | * If we previously allocated a block out beyond eof and we are now |
1288 | * coming back to use it then we will need to flag it as new even if it | |
1289 | * has a disk address. | |
1290 | * | |
1291 | * With sub-block writes into unwritten extents we also need to mark | |
1292 | * the buffer as new so that the unwritten parts of the buffer gets | |
1293 | * correctly zeroed. | |
1da177e4 LT |
1294 | */ |
1295 | if (create && | |
1296 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || | |
549054af | 1297 | (offset >= i_size_read(inode)) || |
207d0416 | 1298 | (new || ISUNWRITTEN(&imap)))) |
1da177e4 | 1299 | set_buffer_new(bh_result); |
1da177e4 | 1300 | |
207d0416 | 1301 | if (imap.br_startblock == DELAYSTARTBLOCK) { |
1da177e4 LT |
1302 | BUG_ON(direct); |
1303 | if (create) { | |
1304 | set_buffer_uptodate(bh_result); | |
1305 | set_buffer_mapped(bh_result); | |
1306 | set_buffer_delay(bh_result); | |
1307 | } | |
1308 | } | |
1309 | ||
2b8f12b7 CH |
1310 | /* |
1311 | * If this is O_DIRECT or the mpage code calling tell them how large | |
1312 | * the mapping is, so that we can avoid repeated get_blocks calls. | |
1313 | */ | |
c2536668 | 1314 | if (direct || size > (1 << inode->i_blkbits)) { |
2b8f12b7 CH |
1315 | xfs_off_t mapping_size; |
1316 | ||
1317 | mapping_size = imap.br_startoff + imap.br_blockcount - iblock; | |
1318 | mapping_size <<= inode->i_blkbits; | |
1319 | ||
1320 | ASSERT(mapping_size > 0); | |
1321 | if (mapping_size > size) | |
1322 | mapping_size = size; | |
1323 | if (mapping_size > LONG_MAX) | |
1324 | mapping_size = LONG_MAX; | |
1325 | ||
1326 | bh_result->b_size = mapping_size; | |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | return 0; | |
a206c817 CH |
1330 | |
1331 | out_unlock: | |
1332 | xfs_iunlock(ip, lockmode); | |
1333 | return -error; | |
1da177e4 LT |
1334 | } |
1335 | ||
1336 | int | |
c2536668 | 1337 | xfs_get_blocks( |
1da177e4 LT |
1338 | struct inode *inode, |
1339 | sector_t iblock, | |
1340 | struct buffer_head *bh_result, | |
1341 | int create) | |
1342 | { | |
f2bde9b8 | 1343 | return __xfs_get_blocks(inode, iblock, bh_result, create, 0); |
1da177e4 LT |
1344 | } |
1345 | ||
1346 | STATIC int | |
e4c573bb | 1347 | xfs_get_blocks_direct( |
1da177e4 LT |
1348 | struct inode *inode, |
1349 | sector_t iblock, | |
1da177e4 LT |
1350 | struct buffer_head *bh_result, |
1351 | int create) | |
1352 | { | |
f2bde9b8 | 1353 | return __xfs_get_blocks(inode, iblock, bh_result, create, 1); |
1da177e4 LT |
1354 | } |
1355 | ||
209fb87a CH |
1356 | /* |
1357 | * Complete a direct I/O write request. | |
1358 | * | |
1359 | * If the private argument is non-NULL __xfs_get_blocks signals us that we | |
1360 | * need to issue a transaction to convert the range from unwritten to written | |
1361 | * extents. In case this is regular synchronous I/O we just call xfs_end_io | |
25985edc | 1362 | * to do this and we are done. But in case this was a successful AIO |
209fb87a CH |
1363 | * request this handler is called from interrupt context, from which we |
1364 | * can't start transactions. In that case offload the I/O completion to | |
1365 | * the workqueues we also use for buffered I/O completion. | |
1366 | */ | |
f0973863 | 1367 | STATIC void |
209fb87a CH |
1368 | xfs_end_io_direct_write( |
1369 | struct kiocb *iocb, | |
1370 | loff_t offset, | |
1371 | ssize_t size, | |
1372 | void *private, | |
1373 | int ret, | |
1374 | bool is_async) | |
f0973863 | 1375 | { |
209fb87a | 1376 | struct xfs_ioend *ioend = iocb->private; |
f0973863 | 1377 | |
2813d682 CH |
1378 | /* |
1379 | * While the generic direct I/O code updates the inode size, it does | |
1380 | * so only after the end_io handler is called, which means our | |
1381 | * end_io handler thinks the on-disk size is outside the in-core | |
1382 | * size. To prevent this just update it a little bit earlier here. | |
1383 | */ | |
1384 | if (offset + size > i_size_read(ioend->io_inode)) | |
1385 | i_size_write(ioend->io_inode, offset + size); | |
1386 | ||
f0973863 | 1387 | /* |
209fb87a CH |
1388 | * blockdev_direct_IO can return an error even after the I/O |
1389 | * completion handler was called. Thus we need to protect | |
1390 | * against double-freeing. | |
f0973863 | 1391 | */ |
209fb87a CH |
1392 | iocb->private = NULL; |
1393 | ||
ba87ea69 LM |
1394 | ioend->io_offset = offset; |
1395 | ioend->io_size = size; | |
c859cdd1 CH |
1396 | ioend->io_iocb = iocb; |
1397 | ioend->io_result = ret; | |
209fb87a | 1398 | if (private && size > 0) |
0d882a36 | 1399 | ioend->io_type = XFS_IO_UNWRITTEN; |
209fb87a CH |
1400 | |
1401 | if (is_async) { | |
c859cdd1 | 1402 | ioend->io_isasync = 1; |
209fb87a | 1403 | xfs_finish_ioend(ioend); |
f0973863 | 1404 | } else { |
209fb87a | 1405 | xfs_finish_ioend_sync(ioend); |
f0973863 | 1406 | } |
f0973863 CH |
1407 | } |
1408 | ||
1da177e4 | 1409 | STATIC ssize_t |
e4c573bb | 1410 | xfs_vm_direct_IO( |
1da177e4 LT |
1411 | int rw, |
1412 | struct kiocb *iocb, | |
1413 | const struct iovec *iov, | |
1414 | loff_t offset, | |
1415 | unsigned long nr_segs) | |
1416 | { | |
209fb87a CH |
1417 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
1418 | struct block_device *bdev = xfs_find_bdev_for_inode(inode); | |
281627df | 1419 | struct xfs_ioend *ioend = NULL; |
209fb87a CH |
1420 | ssize_t ret; |
1421 | ||
1422 | if (rw & WRITE) { | |
281627df CH |
1423 | size_t size = iov_length(iov, nr_segs); |
1424 | ||
1425 | /* | |
437a255a DC |
1426 | * We cannot preallocate a size update transaction here as we |
1427 | * don't know whether allocation is necessary or not. Hence we | |
1428 | * can only tell IO completion that one is necessary if we are | |
1429 | * not doing unwritten extent conversion. | |
281627df | 1430 | */ |
0d882a36 | 1431 | iocb->private = ioend = xfs_alloc_ioend(inode, XFS_IO_DIRECT); |
437a255a | 1432 | if (offset + size > XFS_I(inode)->i_d.di_size) |
281627df | 1433 | ioend->io_isdirect = 1; |
209fb87a | 1434 | |
eafdc7d1 CH |
1435 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
1436 | offset, nr_segs, | |
1437 | xfs_get_blocks_direct, | |
1438 | xfs_end_io_direct_write, NULL, 0); | |
209fb87a | 1439 | if (ret != -EIOCBQUEUED && iocb->private) |
437a255a | 1440 | goto out_destroy_ioend; |
209fb87a | 1441 | } else { |
eafdc7d1 CH |
1442 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
1443 | offset, nr_segs, | |
1444 | xfs_get_blocks_direct, | |
1445 | NULL, NULL, 0); | |
209fb87a | 1446 | } |
f0973863 | 1447 | |
f0973863 | 1448 | return ret; |
281627df | 1449 | |
281627df CH |
1450 | out_destroy_ioend: |
1451 | xfs_destroy_ioend(ioend); | |
1452 | return ret; | |
1da177e4 LT |
1453 | } |
1454 | ||
d3bc815a DC |
1455 | /* |
1456 | * Punch out the delalloc blocks we have already allocated. | |
1457 | * | |
1458 | * Don't bother with xfs_setattr given that nothing can have made it to disk yet | |
1459 | * as the page is still locked at this point. | |
1460 | */ | |
1461 | STATIC void | |
1462 | xfs_vm_kill_delalloc_range( | |
1463 | struct inode *inode, | |
1464 | loff_t start, | |
1465 | loff_t end) | |
1466 | { | |
1467 | struct xfs_inode *ip = XFS_I(inode); | |
1468 | xfs_fileoff_t start_fsb; | |
1469 | xfs_fileoff_t end_fsb; | |
1470 | int error; | |
1471 | ||
1472 | start_fsb = XFS_B_TO_FSB(ip->i_mount, start); | |
1473 | end_fsb = XFS_B_TO_FSB(ip->i_mount, end); | |
1474 | if (end_fsb <= start_fsb) | |
1475 | return; | |
1476 | ||
1477 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1478 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, | |
1479 | end_fsb - start_fsb); | |
1480 | if (error) { | |
1481 | /* something screwed, just bail */ | |
1482 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
1483 | xfs_alert(ip->i_mount, | |
1484 | "xfs_vm_write_failed: unable to clean up ino %lld", | |
1485 | ip->i_ino); | |
1486 | } | |
1487 | } | |
1488 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1489 | } | |
1490 | ||
fa9b227e CH |
1491 | STATIC void |
1492 | xfs_vm_write_failed( | |
d3bc815a DC |
1493 | struct inode *inode, |
1494 | struct page *page, | |
1495 | loff_t pos, | |
1496 | unsigned len) | |
fa9b227e | 1497 | { |
d3bc815a DC |
1498 | loff_t block_offset = pos & PAGE_MASK; |
1499 | loff_t block_start; | |
1500 | loff_t block_end; | |
1501 | loff_t from = pos & (PAGE_CACHE_SIZE - 1); | |
1502 | loff_t to = from + len; | |
1503 | struct buffer_head *bh, *head; | |
fa9b227e | 1504 | |
d3bc815a | 1505 | ASSERT(block_offset + from == pos); |
c726de44 | 1506 | |
d3bc815a DC |
1507 | head = page_buffers(page); |
1508 | block_start = 0; | |
1509 | for (bh = head; bh != head || !block_start; | |
1510 | bh = bh->b_this_page, block_start = block_end, | |
1511 | block_offset += bh->b_size) { | |
1512 | block_end = block_start + bh->b_size; | |
c726de44 | 1513 | |
d3bc815a DC |
1514 | /* skip buffers before the write */ |
1515 | if (block_end <= from) | |
1516 | continue; | |
1517 | ||
1518 | /* if the buffer is after the write, we're done */ | |
1519 | if (block_start >= to) | |
1520 | break; | |
1521 | ||
1522 | if (!buffer_delay(bh)) | |
1523 | continue; | |
1524 | ||
1525 | if (!buffer_new(bh) && block_offset < i_size_read(inode)) | |
1526 | continue; | |
1527 | ||
1528 | xfs_vm_kill_delalloc_range(inode, block_offset, | |
1529 | block_offset + bh->b_size); | |
fa9b227e | 1530 | } |
d3bc815a | 1531 | |
fa9b227e CH |
1532 | } |
1533 | ||
d3bc815a DC |
1534 | /* |
1535 | * This used to call block_write_begin(), but it unlocks and releases the page | |
1536 | * on error, and we need that page to be able to punch stale delalloc blocks out | |
1537 | * on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at | |
1538 | * the appropriate point. | |
1539 | */ | |
f51623b2 | 1540 | STATIC int |
d79689c7 | 1541 | xfs_vm_write_begin( |
f51623b2 | 1542 | struct file *file, |
d79689c7 NP |
1543 | struct address_space *mapping, |
1544 | loff_t pos, | |
1545 | unsigned len, | |
1546 | unsigned flags, | |
1547 | struct page **pagep, | |
1548 | void **fsdata) | |
f51623b2 | 1549 | { |
d3bc815a DC |
1550 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
1551 | struct page *page; | |
1552 | int status; | |
155130a4 | 1553 | |
d3bc815a DC |
1554 | ASSERT(len <= PAGE_CACHE_SIZE); |
1555 | ||
1556 | page = grab_cache_page_write_begin(mapping, index, | |
1557 | flags | AOP_FLAG_NOFS); | |
1558 | if (!page) | |
1559 | return -ENOMEM; | |
1560 | ||
1561 | status = __block_write_begin(page, pos, len, xfs_get_blocks); | |
1562 | if (unlikely(status)) { | |
1563 | struct inode *inode = mapping->host; | |
1564 | ||
1565 | xfs_vm_write_failed(inode, page, pos, len); | |
1566 | unlock_page(page); | |
1567 | ||
1568 | if (pos + len > i_size_read(inode)) | |
1569 | truncate_pagecache(inode, pos + len, i_size_read(inode)); | |
1570 | ||
1571 | page_cache_release(page); | |
1572 | page = NULL; | |
1573 | } | |
1574 | ||
1575 | *pagep = page; | |
1576 | return status; | |
fa9b227e CH |
1577 | } |
1578 | ||
d3bc815a DC |
1579 | /* |
1580 | * On failure, we only need to kill delalloc blocks beyond EOF because they | |
1581 | * will never be written. For blocks within EOF, generic_write_end() zeros them | |
1582 | * so they are safe to leave alone and be written with all the other valid data. | |
1583 | */ | |
fa9b227e CH |
1584 | STATIC int |
1585 | xfs_vm_write_end( | |
1586 | struct file *file, | |
1587 | struct address_space *mapping, | |
1588 | loff_t pos, | |
1589 | unsigned len, | |
1590 | unsigned copied, | |
1591 | struct page *page, | |
1592 | void *fsdata) | |
1593 | { | |
1594 | int ret; | |
155130a4 | 1595 | |
d3bc815a DC |
1596 | ASSERT(len <= PAGE_CACHE_SIZE); |
1597 | ||
fa9b227e | 1598 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
d3bc815a DC |
1599 | if (unlikely(ret < len)) { |
1600 | struct inode *inode = mapping->host; | |
1601 | size_t isize = i_size_read(inode); | |
1602 | loff_t to = pos + len; | |
1603 | ||
1604 | if (to > isize) { | |
1605 | truncate_pagecache(inode, to, isize); | |
1606 | xfs_vm_kill_delalloc_range(inode, isize, to); | |
1607 | } | |
1608 | } | |
155130a4 | 1609 | return ret; |
f51623b2 | 1610 | } |
1da177e4 LT |
1611 | |
1612 | STATIC sector_t | |
e4c573bb | 1613 | xfs_vm_bmap( |
1da177e4 LT |
1614 | struct address_space *mapping, |
1615 | sector_t block) | |
1616 | { | |
1617 | struct inode *inode = (struct inode *)mapping->host; | |
739bfb2a | 1618 | struct xfs_inode *ip = XFS_I(inode); |
1da177e4 | 1619 | |
cca28fb8 | 1620 | trace_xfs_vm_bmap(XFS_I(inode)); |
126468b1 | 1621 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
4bc1ea6b | 1622 | filemap_write_and_wait(mapping); |
126468b1 | 1623 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
c2536668 | 1624 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
1da177e4 LT |
1625 | } |
1626 | ||
1627 | STATIC int | |
e4c573bb | 1628 | xfs_vm_readpage( |
1da177e4 LT |
1629 | struct file *unused, |
1630 | struct page *page) | |
1631 | { | |
c2536668 | 1632 | return mpage_readpage(page, xfs_get_blocks); |
1da177e4 LT |
1633 | } |
1634 | ||
1635 | STATIC int | |
e4c573bb | 1636 | xfs_vm_readpages( |
1da177e4 LT |
1637 | struct file *unused, |
1638 | struct address_space *mapping, | |
1639 | struct list_head *pages, | |
1640 | unsigned nr_pages) | |
1641 | { | |
c2536668 | 1642 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
1da177e4 LT |
1643 | } |
1644 | ||
f5e54d6e | 1645 | const struct address_space_operations xfs_address_space_operations = { |
e4c573bb NS |
1646 | .readpage = xfs_vm_readpage, |
1647 | .readpages = xfs_vm_readpages, | |
1648 | .writepage = xfs_vm_writepage, | |
7d4fb40a | 1649 | .writepages = xfs_vm_writepages, |
238f4c54 NS |
1650 | .releasepage = xfs_vm_releasepage, |
1651 | .invalidatepage = xfs_vm_invalidatepage, | |
d79689c7 | 1652 | .write_begin = xfs_vm_write_begin, |
fa9b227e | 1653 | .write_end = xfs_vm_write_end, |
e4c573bb NS |
1654 | .bmap = xfs_vm_bmap, |
1655 | .direct_IO = xfs_vm_direct_IO, | |
e965f963 | 1656 | .migratepage = buffer_migrate_page, |
bddaafa1 | 1657 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1658 | .error_remove_page = generic_error_remove_page, |
1da177e4 | 1659 | }; |