Commit | Line | Data |
---|---|---|
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" |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
1da177e4 | 35 | #include <linux/mpage.h> |
10ce4444 | 36 | #include <linux/pagevec.h> |
1da177e4 LT |
37 | #include <linux/writeback.h> |
38 | ||
0b1b213f | 39 | void |
f51623b2 NS |
40 | xfs_count_page_state( |
41 | struct page *page, | |
42 | int *delalloc, | |
f51623b2 NS |
43 | int *unwritten) |
44 | { | |
45 | struct buffer_head *bh, *head; | |
46 | ||
20cb52eb | 47 | *delalloc = *unwritten = 0; |
f51623b2 NS |
48 | |
49 | bh = head = page_buffers(page); | |
50 | do { | |
20cb52eb | 51 | if (buffer_unwritten(bh)) |
f51623b2 NS |
52 | (*unwritten) = 1; |
53 | else if (buffer_delay(bh)) | |
54 | (*delalloc) = 1; | |
55 | } while ((bh = bh->b_this_page) != head); | |
56 | } | |
57 | ||
6214ed44 CH |
58 | STATIC struct block_device * |
59 | xfs_find_bdev_for_inode( | |
046f1685 | 60 | struct inode *inode) |
6214ed44 | 61 | { |
046f1685 | 62 | struct xfs_inode *ip = XFS_I(inode); |
6214ed44 CH |
63 | struct xfs_mount *mp = ip->i_mount; |
64 | ||
71ddabb9 | 65 | if (XFS_IS_REALTIME_INODE(ip)) |
6214ed44 CH |
66 | return mp->m_rtdev_targp->bt_bdev; |
67 | else | |
68 | return mp->m_ddev_targp->bt_bdev; | |
69 | } | |
70 | ||
f6d6d4fc CH |
71 | /* |
72 | * We're now finished for good with this ioend structure. | |
73 | * Update the page state via the associated buffer_heads, | |
74 | * release holds on the inode and bio, and finally free | |
75 | * up memory. Do not use the ioend after this. | |
76 | */ | |
0829c360 CH |
77 | STATIC void |
78 | xfs_destroy_ioend( | |
79 | xfs_ioend_t *ioend) | |
80 | { | |
f6d6d4fc CH |
81 | struct buffer_head *bh, *next; |
82 | ||
83 | for (bh = ioend->io_buffer_head; bh; bh = next) { | |
84 | next = bh->b_private; | |
7d04a335 | 85 | bh->b_end_io(bh, !ioend->io_error); |
f6d6d4fc | 86 | } |
583fa586 | 87 | |
c859cdd1 | 88 | if (ioend->io_iocb) { |
4b05d09c | 89 | inode_dio_done(ioend->io_inode); |
04f658ee CH |
90 | if (ioend->io_isasync) { |
91 | aio_complete(ioend->io_iocb, ioend->io_error ? | |
92 | ioend->io_error : ioend->io_result, 0); | |
93 | } | |
c859cdd1 | 94 | } |
4a06fd26 | 95 | |
0829c360 CH |
96 | mempool_free(ioend, xfs_ioend_pool); |
97 | } | |
98 | ||
fc0063c4 CH |
99 | /* |
100 | * Fast and loose check if this write could update the on-disk inode size. | |
101 | */ | |
102 | static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend) | |
103 | { | |
104 | return ioend->io_offset + ioend->io_size > | |
105 | XFS_I(ioend->io_inode)->i_d.di_size; | |
106 | } | |
107 | ||
281627df CH |
108 | STATIC int |
109 | xfs_setfilesize_trans_alloc( | |
110 | struct xfs_ioend *ioend) | |
111 | { | |
112 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; | |
113 | struct xfs_trans *tp; | |
114 | int error; | |
115 | ||
116 | tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); | |
117 | ||
118 | error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0); | |
119 | if (error) { | |
120 | xfs_trans_cancel(tp, 0); | |
121 | return error; | |
122 | } | |
123 | ||
124 | ioend->io_append_trans = tp; | |
125 | ||
d9457dc0 | 126 | /* |
437a255a | 127 | * We may pass freeze protection with a transaction. So tell lockdep |
d9457dc0 JK |
128 | * we released it. |
129 | */ | |
130 | rwsem_release(&ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], | |
131 | 1, _THIS_IP_); | |
281627df CH |
132 | /* |
133 | * We hand off the transaction to the completion thread now, so | |
134 | * clear the flag here. | |
135 | */ | |
136 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
137 | return 0; | |
138 | } | |
139 | ||
ba87ea69 | 140 | /* |
2813d682 | 141 | * Update on-disk file size now that data has been written to disk. |
ba87ea69 | 142 | */ |
281627df | 143 | STATIC int |
ba87ea69 | 144 | xfs_setfilesize( |
aa6bf01d | 145 | struct xfs_ioend *ioend) |
ba87ea69 | 146 | { |
aa6bf01d | 147 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
281627df | 148 | struct xfs_trans *tp = ioend->io_append_trans; |
ba87ea69 | 149 | xfs_fsize_t isize; |
ba87ea69 | 150 | |
281627df | 151 | /* |
437a255a DC |
152 | * The transaction may have been allocated in the I/O submission thread, |
153 | * thus we need to mark ourselves as beeing in a transaction manually. | |
154 | * Similarly for freeze protection. | |
281627df CH |
155 | */ |
156 | current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
437a255a DC |
157 | rwsem_acquire_read(&VFS_I(ip)->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], |
158 | 0, 1, _THIS_IP_); | |
281627df | 159 | |
aa6bf01d | 160 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
6923e686 | 161 | isize = xfs_new_eof(ip, ioend->io_offset + ioend->io_size); |
281627df CH |
162 | if (!isize) { |
163 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
164 | xfs_trans_cancel(tp, 0); | |
165 | return 0; | |
ba87ea69 LM |
166 | } |
167 | ||
281627df CH |
168 | trace_xfs_setfilesize(ip, ioend->io_offset, ioend->io_size); |
169 | ||
170 | ip->i_d.di_size = isize; | |
171 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
172 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
173 | ||
174 | return xfs_trans_commit(tp, 0); | |
77d7a0c2 DC |
175 | } |
176 | ||
177 | /* | |
209fb87a | 178 | * Schedule IO completion handling on the final put of an ioend. |
fc0063c4 CH |
179 | * |
180 | * If there is no work to do we might as well call it a day and free the | |
181 | * ioend right now. | |
77d7a0c2 DC |
182 | */ |
183 | STATIC void | |
184 | xfs_finish_ioend( | |
209fb87a | 185 | struct xfs_ioend *ioend) |
77d7a0c2 DC |
186 | { |
187 | if (atomic_dec_and_test(&ioend->io_remaining)) { | |
aa6bf01d CH |
188 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
189 | ||
0d882a36 | 190 | if (ioend->io_type == XFS_IO_UNWRITTEN) |
aa6bf01d | 191 | queue_work(mp->m_unwritten_workqueue, &ioend->io_work); |
437a255a DC |
192 | else if (ioend->io_append_trans || |
193 | (ioend->io_isdirect && xfs_ioend_is_append(ioend))) | |
aa6bf01d | 194 | queue_work(mp->m_data_workqueue, &ioend->io_work); |
fc0063c4 CH |
195 | else |
196 | xfs_destroy_ioend(ioend); | |
77d7a0c2 | 197 | } |
ba87ea69 LM |
198 | } |
199 | ||
0829c360 | 200 | /* |
5ec4fabb | 201 | * IO write completion. |
f6d6d4fc CH |
202 | */ |
203 | STATIC void | |
5ec4fabb | 204 | xfs_end_io( |
77d7a0c2 | 205 | struct work_struct *work) |
0829c360 | 206 | { |
77d7a0c2 DC |
207 | xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work); |
208 | struct xfs_inode *ip = XFS_I(ioend->io_inode); | |
69418932 | 209 | int error = 0; |
ba87ea69 | 210 | |
04f658ee | 211 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
810627d9 | 212 | ioend->io_error = -EIO; |
04f658ee CH |
213 | goto done; |
214 | } | |
215 | if (ioend->io_error) | |
216 | goto done; | |
217 | ||
5ec4fabb CH |
218 | /* |
219 | * For unwritten extents we need to issue transactions to convert a | |
220 | * range to normal written extens after the data I/O has finished. | |
221 | */ | |
0d882a36 | 222 | if (ioend->io_type == XFS_IO_UNWRITTEN) { |
437a255a DC |
223 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, |
224 | ioend->io_size); | |
225 | } else if (ioend->io_isdirect && xfs_ioend_is_append(ioend)) { | |
281627df | 226 | /* |
437a255a DC |
227 | * For direct I/O we do not know if we need to allocate blocks |
228 | * or not so we can't preallocate an append transaction as that | |
229 | * results in nested reservations and log space deadlocks. Hence | |
230 | * allocate the transaction here. While this is sub-optimal and | |
231 | * can block IO completion for some time, we're stuck with doing | |
232 | * it this way until we can pass the ioend to the direct IO | |
233 | * allocation callbacks and avoid nesting that way. | |
281627df | 234 | */ |
437a255a DC |
235 | error = xfs_setfilesize_trans_alloc(ioend); |
236 | if (error) | |
04f658ee | 237 | goto done; |
437a255a | 238 | error = xfs_setfilesize(ioend); |
281627df CH |
239 | } else if (ioend->io_append_trans) { |
240 | error = xfs_setfilesize(ioend); | |
84803fb7 | 241 | } else { |
281627df | 242 | ASSERT(!xfs_ioend_is_append(ioend)); |
5ec4fabb | 243 | } |
ba87ea69 | 244 | |
04f658ee | 245 | done: |
437a255a DC |
246 | if (error) |
247 | ioend->io_error = -error; | |
aa6bf01d | 248 | xfs_destroy_ioend(ioend); |
c626d174 DC |
249 | } |
250 | ||
209fb87a CH |
251 | /* |
252 | * Call IO completion handling in caller context on the final put of an ioend. | |
253 | */ | |
254 | STATIC void | |
255 | xfs_finish_ioend_sync( | |
256 | struct xfs_ioend *ioend) | |
257 | { | |
258 | if (atomic_dec_and_test(&ioend->io_remaining)) | |
259 | xfs_end_io(&ioend->io_work); | |
260 | } | |
261 | ||
0829c360 CH |
262 | /* |
263 | * Allocate and initialise an IO completion structure. | |
264 | * We need to track unwritten extent write completion here initially. | |
265 | * We'll need to extend this for updating the ondisk inode size later | |
266 | * (vs. incore size). | |
267 | */ | |
268 | STATIC xfs_ioend_t * | |
269 | xfs_alloc_ioend( | |
f6d6d4fc CH |
270 | struct inode *inode, |
271 | unsigned int type) | |
0829c360 CH |
272 | { |
273 | xfs_ioend_t *ioend; | |
274 | ||
275 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); | |
276 | ||
277 | /* | |
278 | * Set the count to 1 initially, which will prevent an I/O | |
279 | * completion callback from happening before we have started | |
280 | * all the I/O from calling the completion routine too early. | |
281 | */ | |
282 | atomic_set(&ioend->io_remaining, 1); | |
c859cdd1 | 283 | ioend->io_isasync = 0; |
281627df | 284 | ioend->io_isdirect = 0; |
7d04a335 | 285 | ioend->io_error = 0; |
f6d6d4fc CH |
286 | ioend->io_list = NULL; |
287 | ioend->io_type = type; | |
b677c210 | 288 | ioend->io_inode = inode; |
c1a073bd | 289 | ioend->io_buffer_head = NULL; |
f6d6d4fc | 290 | ioend->io_buffer_tail = NULL; |
0829c360 CH |
291 | ioend->io_offset = 0; |
292 | ioend->io_size = 0; | |
fb511f21 CH |
293 | ioend->io_iocb = NULL; |
294 | ioend->io_result = 0; | |
281627df | 295 | ioend->io_append_trans = NULL; |
0829c360 | 296 | |
5ec4fabb | 297 | INIT_WORK(&ioend->io_work, xfs_end_io); |
0829c360 CH |
298 | return ioend; |
299 | } | |
300 | ||
1da177e4 LT |
301 | STATIC int |
302 | xfs_map_blocks( | |
303 | struct inode *inode, | |
304 | loff_t offset, | |
207d0416 | 305 | struct xfs_bmbt_irec *imap, |
a206c817 CH |
306 | int type, |
307 | int nonblocking) | |
1da177e4 | 308 | { |
a206c817 CH |
309 | struct xfs_inode *ip = XFS_I(inode); |
310 | struct xfs_mount *mp = ip->i_mount; | |
ed1e7b7e | 311 | ssize_t count = 1 << inode->i_blkbits; |
a206c817 CH |
312 | xfs_fileoff_t offset_fsb, end_fsb; |
313 | int error = 0; | |
a206c817 CH |
314 | int bmapi_flags = XFS_BMAPI_ENTIRE; |
315 | int nimaps = 1; | |
316 | ||
317 | if (XFS_FORCED_SHUTDOWN(mp)) | |
318 | return -XFS_ERROR(EIO); | |
319 | ||
0d882a36 | 320 | if (type == XFS_IO_UNWRITTEN) |
a206c817 | 321 | bmapi_flags |= XFS_BMAPI_IGSTATE; |
8ff2957d CH |
322 | |
323 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { | |
324 | if (nonblocking) | |
325 | return -XFS_ERROR(EAGAIN); | |
326 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
a206c817 CH |
327 | } |
328 | ||
8ff2957d CH |
329 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
330 | (ip->i_df.if_flags & XFS_IFEXTENTS)); | |
d2c28191 | 331 | ASSERT(offset <= mp->m_super->s_maxbytes); |
8ff2957d | 332 | |
d2c28191 DC |
333 | if (offset + count > mp->m_super->s_maxbytes) |
334 | count = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
335 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
336 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
5c8ed202 DC |
337 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
338 | imap, &nimaps, bmapi_flags); | |
8ff2957d | 339 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
a206c817 | 340 | |
8ff2957d CH |
341 | if (error) |
342 | return -XFS_ERROR(error); | |
a206c817 | 343 | |
0d882a36 | 344 | if (type == XFS_IO_DELALLOC && |
8ff2957d | 345 | (!nimaps || isnullstartblock(imap->br_startblock))) { |
a206c817 CH |
346 | error = xfs_iomap_write_allocate(ip, offset, count, imap); |
347 | if (!error) | |
348 | trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); | |
8ff2957d | 349 | return -XFS_ERROR(error); |
a206c817 CH |
350 | } |
351 | ||
8ff2957d | 352 | #ifdef DEBUG |
0d882a36 | 353 | if (type == XFS_IO_UNWRITTEN) { |
8ff2957d CH |
354 | ASSERT(nimaps); |
355 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); | |
356 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
357 | } | |
358 | #endif | |
359 | if (nimaps) | |
360 | trace_xfs_map_blocks_found(ip, offset, count, type, imap); | |
361 | return 0; | |
1da177e4 LT |
362 | } |
363 | ||
b8f82a4a | 364 | STATIC int |
558e6891 | 365 | xfs_imap_valid( |
8699bb0a | 366 | struct inode *inode, |
207d0416 | 367 | struct xfs_bmbt_irec *imap, |
558e6891 | 368 | xfs_off_t offset) |
1da177e4 | 369 | { |
558e6891 | 370 | offset >>= inode->i_blkbits; |
8699bb0a | 371 | |
558e6891 CH |
372 | return offset >= imap->br_startoff && |
373 | offset < imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
374 | } |
375 | ||
f6d6d4fc CH |
376 | /* |
377 | * BIO completion handler for buffered IO. | |
378 | */ | |
782e3b3b | 379 | STATIC void |
f6d6d4fc CH |
380 | xfs_end_bio( |
381 | struct bio *bio, | |
f6d6d4fc CH |
382 | int error) |
383 | { | |
384 | xfs_ioend_t *ioend = bio->bi_private; | |
385 | ||
f6d6d4fc | 386 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
7d04a335 | 387 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
f6d6d4fc CH |
388 | |
389 | /* Toss bio and pass work off to an xfsdatad thread */ | |
f6d6d4fc CH |
390 | bio->bi_private = NULL; |
391 | bio->bi_end_io = NULL; | |
f6d6d4fc | 392 | bio_put(bio); |
7d04a335 | 393 | |
209fb87a | 394 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
395 | } |
396 | ||
397 | STATIC void | |
398 | xfs_submit_ioend_bio( | |
06342cf8 CH |
399 | struct writeback_control *wbc, |
400 | xfs_ioend_t *ioend, | |
401 | struct bio *bio) | |
f6d6d4fc CH |
402 | { |
403 | atomic_inc(&ioend->io_remaining); | |
f6d6d4fc CH |
404 | bio->bi_private = ioend; |
405 | bio->bi_end_io = xfs_end_bio; | |
721a9602 | 406 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio); |
f6d6d4fc CH |
407 | } |
408 | ||
409 | STATIC struct bio * | |
410 | xfs_alloc_ioend_bio( | |
411 | struct buffer_head *bh) | |
412 | { | |
f6d6d4fc | 413 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
221cb251 | 414 | struct bio *bio = bio_alloc(GFP_NOIO, nvecs); |
f6d6d4fc CH |
415 | |
416 | ASSERT(bio->bi_private == NULL); | |
417 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); | |
418 | bio->bi_bdev = bh->b_bdev; | |
f6d6d4fc CH |
419 | return bio; |
420 | } | |
421 | ||
422 | STATIC void | |
423 | xfs_start_buffer_writeback( | |
424 | struct buffer_head *bh) | |
425 | { | |
426 | ASSERT(buffer_mapped(bh)); | |
427 | ASSERT(buffer_locked(bh)); | |
428 | ASSERT(!buffer_delay(bh)); | |
429 | ASSERT(!buffer_unwritten(bh)); | |
430 | ||
431 | mark_buffer_async_write(bh); | |
432 | set_buffer_uptodate(bh); | |
433 | clear_buffer_dirty(bh); | |
434 | } | |
435 | ||
436 | STATIC void | |
437 | xfs_start_page_writeback( | |
438 | struct page *page, | |
f6d6d4fc CH |
439 | int clear_dirty, |
440 | int buffers) | |
441 | { | |
442 | ASSERT(PageLocked(page)); | |
443 | ASSERT(!PageWriteback(page)); | |
f6d6d4fc | 444 | if (clear_dirty) |
92132021 DC |
445 | clear_page_dirty_for_io(page); |
446 | set_page_writeback(page); | |
f6d6d4fc | 447 | unlock_page(page); |
1f7decf6 FW |
448 | /* If no buffers on the page are to be written, finish it here */ |
449 | if (!buffers) | |
f6d6d4fc | 450 | end_page_writeback(page); |
f6d6d4fc CH |
451 | } |
452 | ||
453 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) | |
454 | { | |
455 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
456 | } | |
457 | ||
458 | /* | |
d88992f6 DC |
459 | * Submit all of the bios for all of the ioends we have saved up, covering the |
460 | * initial writepage page and also any probed pages. | |
461 | * | |
462 | * Because we may have multiple ioends spanning a page, we need to start | |
463 | * writeback on all the buffers before we submit them for I/O. If we mark the | |
464 | * buffers as we got, then we can end up with a page that only has buffers | |
465 | * marked async write and I/O complete on can occur before we mark the other | |
466 | * buffers async write. | |
467 | * | |
468 | * The end result of this is that we trip a bug in end_page_writeback() because | |
469 | * we call it twice for the one page as the code in end_buffer_async_write() | |
470 | * assumes that all buffers on the page are started at the same time. | |
471 | * | |
472 | * The fix is two passes across the ioend list - one to start writeback on the | |
c41564b5 | 473 | * buffer_heads, and then submit them for I/O on the second pass. |
7bf7f352 DC |
474 | * |
475 | * If @fail is non-zero, it means that we have a situation where some part of | |
476 | * the submission process has failed after we have marked paged for writeback | |
477 | * and unlocked them. In this situation, we need to fail the ioend chain rather | |
478 | * than submit it to IO. This typically only happens on a filesystem shutdown. | |
f6d6d4fc CH |
479 | */ |
480 | STATIC void | |
481 | xfs_submit_ioend( | |
06342cf8 | 482 | struct writeback_control *wbc, |
7bf7f352 DC |
483 | xfs_ioend_t *ioend, |
484 | int fail) | |
f6d6d4fc | 485 | { |
d88992f6 | 486 | xfs_ioend_t *head = ioend; |
f6d6d4fc CH |
487 | xfs_ioend_t *next; |
488 | struct buffer_head *bh; | |
489 | struct bio *bio; | |
490 | sector_t lastblock = 0; | |
491 | ||
d88992f6 DC |
492 | /* Pass 1 - start writeback */ |
493 | do { | |
494 | next = ioend->io_list; | |
221cb251 | 495 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) |
d88992f6 | 496 | xfs_start_buffer_writeback(bh); |
d88992f6 DC |
497 | } while ((ioend = next) != NULL); |
498 | ||
499 | /* Pass 2 - submit I/O */ | |
500 | ioend = head; | |
f6d6d4fc CH |
501 | do { |
502 | next = ioend->io_list; | |
503 | bio = NULL; | |
504 | ||
7bf7f352 DC |
505 | /* |
506 | * If we are failing the IO now, just mark the ioend with an | |
507 | * error and finish it. This will run IO completion immediately | |
508 | * as there is only one reference to the ioend at this point in | |
509 | * time. | |
510 | */ | |
511 | if (fail) { | |
512 | ioend->io_error = -fail; | |
513 | xfs_finish_ioend(ioend); | |
514 | continue; | |
515 | } | |
516 | ||
f6d6d4fc | 517 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { |
f6d6d4fc CH |
518 | |
519 | if (!bio) { | |
520 | retry: | |
521 | bio = xfs_alloc_ioend_bio(bh); | |
522 | } else if (bh->b_blocknr != lastblock + 1) { | |
06342cf8 | 523 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
524 | goto retry; |
525 | } | |
526 | ||
527 | if (bio_add_buffer(bio, bh) != bh->b_size) { | |
06342cf8 | 528 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
529 | goto retry; |
530 | } | |
531 | ||
532 | lastblock = bh->b_blocknr; | |
533 | } | |
534 | if (bio) | |
06342cf8 | 535 | xfs_submit_ioend_bio(wbc, ioend, bio); |
209fb87a | 536 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
537 | } while ((ioend = next) != NULL); |
538 | } | |
539 | ||
540 | /* | |
541 | * Cancel submission of all buffer_heads so far in this endio. | |
542 | * Toss the endio too. Only ever called for the initial page | |
543 | * in a writepage request, so only ever one page. | |
544 | */ | |
545 | STATIC void | |
546 | xfs_cancel_ioend( | |
547 | xfs_ioend_t *ioend) | |
548 | { | |
549 | xfs_ioend_t *next; | |
550 | struct buffer_head *bh, *next_bh; | |
551 | ||
552 | do { | |
553 | next = ioend->io_list; | |
554 | bh = ioend->io_buffer_head; | |
555 | do { | |
556 | next_bh = bh->b_private; | |
557 | clear_buffer_async_write(bh); | |
558 | unlock_buffer(bh); | |
559 | } while ((bh = next_bh) != NULL); | |
560 | ||
f6d6d4fc CH |
561 | mempool_free(ioend, xfs_ioend_pool); |
562 | } while ((ioend = next) != NULL); | |
563 | } | |
564 | ||
565 | /* | |
566 | * Test to see if we've been building up a completion structure for | |
567 | * earlier buffers -- if so, we try to append to this ioend if we | |
568 | * can, otherwise we finish off any current ioend and start another. | |
569 | * Return true if we've finished the given ioend. | |
570 | */ | |
571 | STATIC void | |
572 | xfs_add_to_ioend( | |
573 | struct inode *inode, | |
574 | struct buffer_head *bh, | |
7336cea8 | 575 | xfs_off_t offset, |
f6d6d4fc CH |
576 | unsigned int type, |
577 | xfs_ioend_t **result, | |
578 | int need_ioend) | |
579 | { | |
580 | xfs_ioend_t *ioend = *result; | |
581 | ||
582 | if (!ioend || need_ioend || type != ioend->io_type) { | |
583 | xfs_ioend_t *previous = *result; | |
f6d6d4fc | 584 | |
f6d6d4fc CH |
585 | ioend = xfs_alloc_ioend(inode, type); |
586 | ioend->io_offset = offset; | |
587 | ioend->io_buffer_head = bh; | |
588 | ioend->io_buffer_tail = bh; | |
589 | if (previous) | |
590 | previous->io_list = ioend; | |
591 | *result = ioend; | |
592 | } else { | |
593 | ioend->io_buffer_tail->b_private = bh; | |
594 | ioend->io_buffer_tail = bh; | |
595 | } | |
596 | ||
597 | bh->b_private = NULL; | |
598 | ioend->io_size += bh->b_size; | |
599 | } | |
600 | ||
87cbc49c NS |
601 | STATIC void |
602 | xfs_map_buffer( | |
046f1685 | 603 | struct inode *inode, |
87cbc49c | 604 | struct buffer_head *bh, |
207d0416 | 605 | struct xfs_bmbt_irec *imap, |
046f1685 | 606 | xfs_off_t offset) |
87cbc49c NS |
607 | { |
608 | sector_t bn; | |
8699bb0a | 609 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
207d0416 CH |
610 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff); |
611 | xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), imap->br_startblock); | |
87cbc49c | 612 | |
207d0416 CH |
613 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
614 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
87cbc49c | 615 | |
e513182d | 616 | bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) + |
8699bb0a | 617 | ((offset - iomap_offset) >> inode->i_blkbits); |
87cbc49c | 618 | |
046f1685 | 619 | ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode))); |
87cbc49c NS |
620 | |
621 | bh->b_blocknr = bn; | |
622 | set_buffer_mapped(bh); | |
623 | } | |
624 | ||
1da177e4 LT |
625 | STATIC void |
626 | xfs_map_at_offset( | |
046f1685 | 627 | struct inode *inode, |
1da177e4 | 628 | struct buffer_head *bh, |
207d0416 | 629 | struct xfs_bmbt_irec *imap, |
046f1685 | 630 | xfs_off_t offset) |
1da177e4 | 631 | { |
207d0416 CH |
632 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
633 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
1da177e4 | 634 | |
207d0416 | 635 | xfs_map_buffer(inode, bh, imap, offset); |
1da177e4 LT |
636 | set_buffer_mapped(bh); |
637 | clear_buffer_delay(bh); | |
f6d6d4fc | 638 | clear_buffer_unwritten(bh); |
1da177e4 LT |
639 | } |
640 | ||
1da177e4 | 641 | /* |
10ce4444 CH |
642 | * Test if a given page is suitable for writing as part of an unwritten |
643 | * or delayed allocate extent. | |
1da177e4 | 644 | */ |
10ce4444 | 645 | STATIC int |
6ffc4db5 | 646 | xfs_check_page_type( |
10ce4444 | 647 | struct page *page, |
f6d6d4fc | 648 | unsigned int type) |
1da177e4 | 649 | { |
1da177e4 | 650 | if (PageWriteback(page)) |
10ce4444 | 651 | return 0; |
1da177e4 LT |
652 | |
653 | if (page->mapping && page_has_buffers(page)) { | |
654 | struct buffer_head *bh, *head; | |
655 | int acceptable = 0; | |
656 | ||
657 | bh = head = page_buffers(page); | |
658 | do { | |
f6d6d4fc | 659 | if (buffer_unwritten(bh)) |
0d882a36 | 660 | acceptable += (type == XFS_IO_UNWRITTEN); |
f6d6d4fc | 661 | else if (buffer_delay(bh)) |
0d882a36 | 662 | acceptable += (type == XFS_IO_DELALLOC); |
2ddee844 | 663 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
0d882a36 | 664 | acceptable += (type == XFS_IO_OVERWRITE); |
f6d6d4fc | 665 | else |
1da177e4 | 666 | break; |
1da177e4 LT |
667 | } while ((bh = bh->b_this_page) != head); |
668 | ||
669 | if (acceptable) | |
10ce4444 | 670 | return 1; |
1da177e4 LT |
671 | } |
672 | ||
10ce4444 | 673 | return 0; |
1da177e4 LT |
674 | } |
675 | ||
1da177e4 LT |
676 | /* |
677 | * Allocate & map buffers for page given the extent map. Write it out. | |
678 | * except for the original page of a writepage, this is called on | |
679 | * delalloc/unwritten pages only, for the original page it is possible | |
680 | * that the page has no mapping at all. | |
681 | */ | |
f6d6d4fc | 682 | STATIC int |
1da177e4 LT |
683 | xfs_convert_page( |
684 | struct inode *inode, | |
685 | struct page *page, | |
10ce4444 | 686 | loff_t tindex, |
207d0416 | 687 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 688 | xfs_ioend_t **ioendp, |
2fa24f92 | 689 | struct writeback_control *wbc) |
1da177e4 | 690 | { |
f6d6d4fc | 691 | struct buffer_head *bh, *head; |
9260dc6b CH |
692 | xfs_off_t end_offset; |
693 | unsigned long p_offset; | |
f6d6d4fc | 694 | unsigned int type; |
24e17b5f | 695 | int len, page_dirty; |
f6d6d4fc | 696 | int count = 0, done = 0, uptodate = 1; |
9260dc6b | 697 | xfs_off_t offset = page_offset(page); |
1da177e4 | 698 | |
10ce4444 CH |
699 | if (page->index != tindex) |
700 | goto fail; | |
529ae9aa | 701 | if (!trylock_page(page)) |
10ce4444 CH |
702 | goto fail; |
703 | if (PageWriteback(page)) | |
704 | goto fail_unlock_page; | |
705 | if (page->mapping != inode->i_mapping) | |
706 | goto fail_unlock_page; | |
6ffc4db5 | 707 | if (!xfs_check_page_type(page, (*ioendp)->io_type)) |
10ce4444 CH |
708 | goto fail_unlock_page; |
709 | ||
24e17b5f NS |
710 | /* |
711 | * page_dirty is initially a count of buffers on the page before | |
c41564b5 | 712 | * EOF and is decremented as we move each into a cleanable state. |
9260dc6b CH |
713 | * |
714 | * Derivation: | |
715 | * | |
716 | * End offset is the highest offset that this page should represent. | |
717 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
718 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
719 | * hence give us the correct page_dirty count. On any other page, | |
720 | * it will be zero and in that case we need page_dirty to be the | |
721 | * count of buffers on the page. | |
24e17b5f | 722 | */ |
9260dc6b CH |
723 | end_offset = min_t(unsigned long long, |
724 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, | |
725 | i_size_read(inode)); | |
726 | ||
24e17b5f | 727 | len = 1 << inode->i_blkbits; |
9260dc6b CH |
728 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
729 | PAGE_CACHE_SIZE); | |
730 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
731 | page_dirty = p_offset / len; | |
24e17b5f | 732 | |
1da177e4 LT |
733 | bh = head = page_buffers(page); |
734 | do { | |
9260dc6b | 735 | if (offset >= end_offset) |
1da177e4 | 736 | break; |
f6d6d4fc CH |
737 | if (!buffer_uptodate(bh)) |
738 | uptodate = 0; | |
739 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { | |
740 | done = 1; | |
1da177e4 | 741 | continue; |
f6d6d4fc CH |
742 | } |
743 | ||
2fa24f92 CH |
744 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
745 | buffer_mapped(bh)) { | |
9260dc6b | 746 | if (buffer_unwritten(bh)) |
0d882a36 | 747 | type = XFS_IO_UNWRITTEN; |
2fa24f92 | 748 | else if (buffer_delay(bh)) |
0d882a36 | 749 | type = XFS_IO_DELALLOC; |
2fa24f92 | 750 | else |
0d882a36 | 751 | type = XFS_IO_OVERWRITE; |
9260dc6b | 752 | |
558e6891 | 753 | if (!xfs_imap_valid(inode, imap, offset)) { |
f6d6d4fc | 754 | done = 1; |
9260dc6b CH |
755 | continue; |
756 | } | |
757 | ||
ecff71e6 | 758 | lock_buffer(bh); |
0d882a36 | 759 | if (type != XFS_IO_OVERWRITE) |
2fa24f92 | 760 | xfs_map_at_offset(inode, bh, imap, offset); |
89f3b363 CH |
761 | xfs_add_to_ioend(inode, bh, offset, type, |
762 | ioendp, done); | |
763 | ||
9260dc6b CH |
764 | page_dirty--; |
765 | count++; | |
766 | } else { | |
2fa24f92 | 767 | done = 1; |
1da177e4 | 768 | } |
7336cea8 | 769 | } while (offset += len, (bh = bh->b_this_page) != head); |
1da177e4 | 770 | |
f6d6d4fc CH |
771 | if (uptodate && bh == head) |
772 | SetPageUptodate(page); | |
773 | ||
89f3b363 | 774 | if (count) { |
efceab1d DC |
775 | if (--wbc->nr_to_write <= 0 && |
776 | wbc->sync_mode == WB_SYNC_NONE) | |
89f3b363 | 777 | done = 1; |
1da177e4 | 778 | } |
89f3b363 | 779 | xfs_start_page_writeback(page, !page_dirty, count); |
f6d6d4fc CH |
780 | |
781 | return done; | |
10ce4444 CH |
782 | fail_unlock_page: |
783 | unlock_page(page); | |
784 | fail: | |
785 | return 1; | |
1da177e4 LT |
786 | } |
787 | ||
788 | /* | |
789 | * Convert & write out a cluster of pages in the same extent as defined | |
790 | * by mp and following the start page. | |
791 | */ | |
792 | STATIC void | |
793 | xfs_cluster_write( | |
794 | struct inode *inode, | |
795 | pgoff_t tindex, | |
207d0416 | 796 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 797 | xfs_ioend_t **ioendp, |
1da177e4 | 798 | struct writeback_control *wbc, |
1da177e4 LT |
799 | pgoff_t tlast) |
800 | { | |
10ce4444 CH |
801 | struct pagevec pvec; |
802 | int done = 0, i; | |
1da177e4 | 803 | |
10ce4444 CH |
804 | pagevec_init(&pvec, 0); |
805 | while (!done && tindex <= tlast) { | |
806 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
807 | ||
808 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
1da177e4 | 809 | break; |
10ce4444 CH |
810 | |
811 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
812 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, | |
2fa24f92 | 813 | imap, ioendp, wbc); |
10ce4444 CH |
814 | if (done) |
815 | break; | |
816 | } | |
817 | ||
818 | pagevec_release(&pvec); | |
819 | cond_resched(); | |
1da177e4 LT |
820 | } |
821 | } | |
822 | ||
3ed3a434 DC |
823 | STATIC void |
824 | xfs_vm_invalidatepage( | |
825 | struct page *page, | |
826 | unsigned long offset) | |
827 | { | |
828 | trace_xfs_invalidatepage(page->mapping->host, page, offset); | |
829 | block_invalidatepage(page, offset); | |
830 | } | |
831 | ||
832 | /* | |
833 | * If the page has delalloc buffers on it, we need to punch them out before we | |
834 | * invalidate the page. If we don't, we leave a stale delalloc mapping on the | |
835 | * inode that can trip a BUG() in xfs_get_blocks() later on if a direct IO read | |
836 | * is done on that same region - the delalloc extent is returned when none is | |
837 | * supposed to be there. | |
838 | * | |
839 | * We prevent this by truncating away the delalloc regions on the page before | |
840 | * invalidating it. Because they are delalloc, we can do this without needing a | |
841 | * transaction. Indeed - if we get ENOSPC errors, we have to be able to do this | |
842 | * truncation without a transaction as there is no space left for block | |
843 | * reservation (typically why we see a ENOSPC in writeback). | |
844 | * | |
845 | * This is not a performance critical path, so for now just do the punching a | |
846 | * buffer head at a time. | |
847 | */ | |
848 | STATIC void | |
849 | xfs_aops_discard_page( | |
850 | struct page *page) | |
851 | { | |
852 | struct inode *inode = page->mapping->host; | |
853 | struct xfs_inode *ip = XFS_I(inode); | |
854 | struct buffer_head *bh, *head; | |
855 | loff_t offset = page_offset(page); | |
3ed3a434 | 856 | |
0d882a36 | 857 | if (!xfs_check_page_type(page, XFS_IO_DELALLOC)) |
3ed3a434 DC |
858 | goto out_invalidate; |
859 | ||
e8c3753c DC |
860 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
861 | goto out_invalidate; | |
862 | ||
4f10700a | 863 | xfs_alert(ip->i_mount, |
3ed3a434 DC |
864 | "page discard on page %p, inode 0x%llx, offset %llu.", |
865 | page, ip->i_ino, offset); | |
866 | ||
867 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
868 | bh = head = page_buffers(page); | |
869 | do { | |
3ed3a434 | 870 | int error; |
c726de44 | 871 | xfs_fileoff_t start_fsb; |
3ed3a434 DC |
872 | |
873 | if (!buffer_delay(bh)) | |
874 | goto next_buffer; | |
875 | ||
c726de44 DC |
876 | start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); |
877 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1); | |
3ed3a434 DC |
878 | if (error) { |
879 | /* something screwed, just bail */ | |
e8c3753c | 880 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
4f10700a | 881 | xfs_alert(ip->i_mount, |
3ed3a434 | 882 | "page discard unable to remove delalloc mapping."); |
e8c3753c | 883 | } |
3ed3a434 DC |
884 | break; |
885 | } | |
886 | next_buffer: | |
c726de44 | 887 | offset += 1 << inode->i_blkbits; |
3ed3a434 DC |
888 | |
889 | } while ((bh = bh->b_this_page) != head); | |
890 | ||
891 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
892 | out_invalidate: | |
893 | xfs_vm_invalidatepage(page, 0); | |
894 | return; | |
895 | } | |
896 | ||
1da177e4 | 897 | /* |
89f3b363 CH |
898 | * Write out a dirty page. |
899 | * | |
900 | * For delalloc space on the page we need to allocate space and flush it. | |
901 | * For unwritten space on the page we need to start the conversion to | |
902 | * regular allocated space. | |
89f3b363 | 903 | * For any other dirty buffer heads on the page we should flush them. |
1da177e4 | 904 | */ |
1da177e4 | 905 | STATIC int |
89f3b363 CH |
906 | xfs_vm_writepage( |
907 | struct page *page, | |
908 | struct writeback_control *wbc) | |
1da177e4 | 909 | { |
89f3b363 | 910 | struct inode *inode = page->mapping->host; |
f6d6d4fc | 911 | struct buffer_head *bh, *head; |
207d0416 | 912 | struct xfs_bmbt_irec imap; |
f6d6d4fc | 913 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
1da177e4 | 914 | loff_t offset; |
f6d6d4fc | 915 | unsigned int type; |
1da177e4 | 916 | __uint64_t end_offset; |
bd1556a1 | 917 | pgoff_t end_index, last_index; |
ed1e7b7e | 918 | ssize_t len; |
a206c817 | 919 | int err, imap_valid = 0, uptodate = 1; |
89f3b363 | 920 | int count = 0; |
a206c817 | 921 | int nonblocking = 0; |
89f3b363 CH |
922 | |
923 | trace_xfs_writepage(inode, page, 0); | |
924 | ||
20cb52eb CH |
925 | ASSERT(page_has_buffers(page)); |
926 | ||
89f3b363 CH |
927 | /* |
928 | * Refuse to write the page out if we are called from reclaim context. | |
929 | * | |
d4f7a5cb CH |
930 | * This avoids stack overflows when called from deeply used stacks in |
931 | * random callers for direct reclaim or memcg reclaim. We explicitly | |
932 | * allow reclaim from kswapd as the stack usage there is relatively low. | |
89f3b363 | 933 | * |
94054fa3 MG |
934 | * This should never happen except in the case of a VM regression so |
935 | * warn about it. | |
89f3b363 | 936 | */ |
94054fa3 MG |
937 | if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == |
938 | PF_MEMALLOC)) | |
b5420f23 | 939 | goto redirty; |
1da177e4 | 940 | |
89f3b363 | 941 | /* |
680a647b CH |
942 | * Given that we do not allow direct reclaim to call us, we should |
943 | * never be called while in a filesystem transaction. | |
89f3b363 | 944 | */ |
680a647b | 945 | if (WARN_ON(current->flags & PF_FSTRANS)) |
b5420f23 | 946 | goto redirty; |
89f3b363 | 947 | |
1da177e4 LT |
948 | /* Is this page beyond the end of the file? */ |
949 | offset = i_size_read(inode); | |
950 | end_index = offset >> PAGE_CACHE_SHIFT; | |
951 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; | |
952 | if (page->index >= end_index) { | |
6b7a03f0 CH |
953 | unsigned offset_into_page = offset & (PAGE_CACHE_SIZE - 1); |
954 | ||
955 | /* | |
956 | * Just skip the page if it is fully outside i_size, e.g. due | |
957 | * to a truncate operation that is in progress. | |
958 | */ | |
959 | if (page->index >= end_index + 1 || offset_into_page == 0) { | |
89f3b363 | 960 | unlock_page(page); |
19d5bcf3 | 961 | return 0; |
1da177e4 | 962 | } |
6b7a03f0 CH |
963 | |
964 | /* | |
965 | * The page straddles i_size. It must be zeroed out on each | |
966 | * and every writepage invocation because it may be mmapped. | |
967 | * "A file is mapped in multiples of the page size. For a file | |
968 | * that is not a multiple of the page size, the remaining | |
969 | * memory is zeroed when mapped, and writes to that region are | |
970 | * not written out to the file." | |
971 | */ | |
972 | zero_user_segment(page, offset_into_page, PAGE_CACHE_SIZE); | |
1da177e4 LT |
973 | } |
974 | ||
f6d6d4fc | 975 | end_offset = min_t(unsigned long long, |
20cb52eb CH |
976 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
977 | offset); | |
24e17b5f | 978 | len = 1 << inode->i_blkbits; |
24e17b5f | 979 | |
24e17b5f | 980 | bh = head = page_buffers(page); |
f6d6d4fc | 981 | offset = page_offset(page); |
0d882a36 | 982 | type = XFS_IO_OVERWRITE; |
a206c817 | 983 | |
dbcdde3e | 984 | if (wbc->sync_mode == WB_SYNC_NONE) |
a206c817 | 985 | nonblocking = 1; |
f6d6d4fc | 986 | |
1da177e4 | 987 | do { |
6ac7248e CH |
988 | int new_ioend = 0; |
989 | ||
1da177e4 LT |
990 | if (offset >= end_offset) |
991 | break; | |
992 | if (!buffer_uptodate(bh)) | |
993 | uptodate = 0; | |
1da177e4 | 994 | |
3d9b02e3 | 995 | /* |
ece413f5 CH |
996 | * set_page_dirty dirties all buffers in a page, independent |
997 | * of their state. The dirty state however is entirely | |
998 | * meaningless for holes (!mapped && uptodate), so skip | |
999 | * buffers covering holes here. | |
3d9b02e3 ES |
1000 | */ |
1001 | if (!buffer_mapped(bh) && buffer_uptodate(bh)) { | |
3d9b02e3 ES |
1002 | imap_valid = 0; |
1003 | continue; | |
1004 | } | |
1005 | ||
aeea1b1f | 1006 | if (buffer_unwritten(bh)) { |
0d882a36 AR |
1007 | if (type != XFS_IO_UNWRITTEN) { |
1008 | type = XFS_IO_UNWRITTEN; | |
aeea1b1f | 1009 | imap_valid = 0; |
1da177e4 | 1010 | } |
aeea1b1f | 1011 | } else if (buffer_delay(bh)) { |
0d882a36 AR |
1012 | if (type != XFS_IO_DELALLOC) { |
1013 | type = XFS_IO_DELALLOC; | |
aeea1b1f | 1014 | imap_valid = 0; |
1da177e4 | 1015 | } |
89f3b363 | 1016 | } else if (buffer_uptodate(bh)) { |
0d882a36 AR |
1017 | if (type != XFS_IO_OVERWRITE) { |
1018 | type = XFS_IO_OVERWRITE; | |
85da94c6 CH |
1019 | imap_valid = 0; |
1020 | } | |
aeea1b1f | 1021 | } else { |
7d0fa3ec | 1022 | if (PageUptodate(page)) |
aeea1b1f | 1023 | ASSERT(buffer_mapped(bh)); |
7d0fa3ec AR |
1024 | /* |
1025 | * This buffer is not uptodate and will not be | |
1026 | * written to disk. Ensure that we will put any | |
1027 | * subsequent writeable buffers into a new | |
1028 | * ioend. | |
1029 | */ | |
1030 | imap_valid = 0; | |
aeea1b1f CH |
1031 | continue; |
1032 | } | |
d5cb48aa | 1033 | |
aeea1b1f CH |
1034 | if (imap_valid) |
1035 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1036 | if (!imap_valid) { | |
1037 | /* | |
1038 | * If we didn't have a valid mapping then we need to | |
1039 | * put the new mapping into a separate ioend structure. | |
1040 | * This ensures non-contiguous extents always have | |
1041 | * separate ioends, which is particularly important | |
1042 | * for unwritten extent conversion at I/O completion | |
1043 | * time. | |
1044 | */ | |
1045 | new_ioend = 1; | |
1046 | err = xfs_map_blocks(inode, offset, &imap, type, | |
1047 | nonblocking); | |
1048 | if (err) | |
1049 | goto error; | |
1050 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1051 | } | |
1052 | if (imap_valid) { | |
ecff71e6 | 1053 | lock_buffer(bh); |
0d882a36 | 1054 | if (type != XFS_IO_OVERWRITE) |
aeea1b1f CH |
1055 | xfs_map_at_offset(inode, bh, &imap, offset); |
1056 | xfs_add_to_ioend(inode, bh, offset, type, &ioend, | |
1057 | new_ioend); | |
1058 | count++; | |
1da177e4 | 1059 | } |
f6d6d4fc CH |
1060 | |
1061 | if (!iohead) | |
1062 | iohead = ioend; | |
1063 | ||
1064 | } while (offset += len, ((bh = bh->b_this_page) != head)); | |
1da177e4 LT |
1065 | |
1066 | if (uptodate && bh == head) | |
1067 | SetPageUptodate(page); | |
1068 | ||
89f3b363 | 1069 | xfs_start_page_writeback(page, 1, count); |
1da177e4 | 1070 | |
7bf7f352 DC |
1071 | /* if there is no IO to be submitted for this page, we are done */ |
1072 | if (!ioend) | |
1073 | return 0; | |
1074 | ||
1075 | ASSERT(iohead); | |
1076 | ||
1077 | /* | |
1078 | * Any errors from this point onwards need tobe reported through the IO | |
1079 | * completion path as we have marked the initial page as under writeback | |
1080 | * and unlocked it. | |
1081 | */ | |
1082 | if (imap_valid) { | |
bd1556a1 CH |
1083 | xfs_off_t end_index; |
1084 | ||
1085 | end_index = imap.br_startoff + imap.br_blockcount; | |
1086 | ||
1087 | /* to bytes */ | |
1088 | end_index <<= inode->i_blkbits; | |
1089 | ||
1090 | /* to pages */ | |
1091 | end_index = (end_index - 1) >> PAGE_CACHE_SHIFT; | |
1092 | ||
1093 | /* check against file size */ | |
1094 | if (end_index > last_index) | |
1095 | end_index = last_index; | |
8699bb0a | 1096 | |
207d0416 | 1097 | xfs_cluster_write(inode, page->index + 1, &imap, &ioend, |
2fa24f92 | 1098 | wbc, end_index); |
1da177e4 LT |
1099 | } |
1100 | ||
281627df | 1101 | |
7bf7f352 DC |
1102 | /* |
1103 | * Reserve log space if we might write beyond the on-disk inode size. | |
1104 | */ | |
1105 | err = 0; | |
1106 | if (ioend->io_type != XFS_IO_UNWRITTEN && xfs_ioend_is_append(ioend)) | |
1107 | err = xfs_setfilesize_trans_alloc(ioend); | |
1108 | ||
1109 | xfs_submit_ioend(wbc, iohead, err); | |
f6d6d4fc | 1110 | |
89f3b363 | 1111 | return 0; |
1da177e4 LT |
1112 | |
1113 | error: | |
f6d6d4fc CH |
1114 | if (iohead) |
1115 | xfs_cancel_ioend(iohead); | |
1da177e4 | 1116 | |
b5420f23 CH |
1117 | if (err == -EAGAIN) |
1118 | goto redirty; | |
1119 | ||
20cb52eb | 1120 | xfs_aops_discard_page(page); |
89f3b363 CH |
1121 | ClearPageUptodate(page); |
1122 | unlock_page(page); | |
1da177e4 | 1123 | return err; |
f51623b2 | 1124 | |
b5420f23 | 1125 | redirty: |
f51623b2 NS |
1126 | redirty_page_for_writepage(wbc, page); |
1127 | unlock_page(page); | |
1128 | return 0; | |
f51623b2 NS |
1129 | } |
1130 | ||
7d4fb40a NS |
1131 | STATIC int |
1132 | xfs_vm_writepages( | |
1133 | struct address_space *mapping, | |
1134 | struct writeback_control *wbc) | |
1135 | { | |
b3aea4ed | 1136 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
7d4fb40a NS |
1137 | return generic_writepages(mapping, wbc); |
1138 | } | |
1139 | ||
f51623b2 NS |
1140 | /* |
1141 | * Called to move a page into cleanable state - and from there | |
89f3b363 | 1142 | * to be released. The page should already be clean. We always |
f51623b2 NS |
1143 | * have buffer heads in this call. |
1144 | * | |
89f3b363 | 1145 | * Returns 1 if the page is ok to release, 0 otherwise. |
f51623b2 NS |
1146 | */ |
1147 | STATIC int | |
238f4c54 | 1148 | xfs_vm_releasepage( |
f51623b2 NS |
1149 | struct page *page, |
1150 | gfp_t gfp_mask) | |
1151 | { | |
20cb52eb | 1152 | int delalloc, unwritten; |
f51623b2 | 1153 | |
89f3b363 | 1154 | trace_xfs_releasepage(page->mapping->host, page, 0); |
238f4c54 | 1155 | |
20cb52eb | 1156 | xfs_count_page_state(page, &delalloc, &unwritten); |
f51623b2 | 1157 | |
89f3b363 | 1158 | if (WARN_ON(delalloc)) |
f51623b2 | 1159 | return 0; |
89f3b363 | 1160 | if (WARN_ON(unwritten)) |
f51623b2 NS |
1161 | return 0; |
1162 | ||
f51623b2 NS |
1163 | return try_to_free_buffers(page); |
1164 | } | |
1165 | ||
1da177e4 | 1166 | STATIC int |
c2536668 | 1167 | __xfs_get_blocks( |
1da177e4 LT |
1168 | struct inode *inode, |
1169 | sector_t iblock, | |
1da177e4 LT |
1170 | struct buffer_head *bh_result, |
1171 | int create, | |
f2bde9b8 | 1172 | int direct) |
1da177e4 | 1173 | { |
a206c817 CH |
1174 | struct xfs_inode *ip = XFS_I(inode); |
1175 | struct xfs_mount *mp = ip->i_mount; | |
1176 | xfs_fileoff_t offset_fsb, end_fsb; | |
1177 | int error = 0; | |
1178 | int lockmode = 0; | |
207d0416 | 1179 | struct xfs_bmbt_irec imap; |
a206c817 | 1180 | int nimaps = 1; |
fdc7ed75 NS |
1181 | xfs_off_t offset; |
1182 | ssize_t size; | |
207d0416 | 1183 | int new = 0; |
a206c817 CH |
1184 | |
1185 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1186 | return -XFS_ERROR(EIO); | |
1da177e4 | 1187 | |
fdc7ed75 | 1188 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
c2536668 NS |
1189 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
1190 | size = bh_result->b_size; | |
364f358a LM |
1191 | |
1192 | if (!create && direct && offset >= i_size_read(inode)) | |
1193 | return 0; | |
1194 | ||
507630b2 DC |
1195 | /* |
1196 | * Direct I/O is usually done on preallocated files, so try getting | |
1197 | * a block mapping without an exclusive lock first. For buffered | |
1198 | * writes we already have the exclusive iolock anyway, so avoiding | |
1199 | * a lock roundtrip here by taking the ilock exclusive from the | |
1200 | * beginning is a useful micro optimization. | |
1201 | */ | |
1202 | if (create && !direct) { | |
a206c817 CH |
1203 | lockmode = XFS_ILOCK_EXCL; |
1204 | xfs_ilock(ip, lockmode); | |
1205 | } else { | |
1206 | lockmode = xfs_ilock_map_shared(ip); | |
1207 | } | |
f2bde9b8 | 1208 | |
d2c28191 DC |
1209 | ASSERT(offset <= mp->m_super->s_maxbytes); |
1210 | if (offset + size > mp->m_super->s_maxbytes) | |
1211 | size = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
1212 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); |
1213 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1214 | ||
5c8ed202 DC |
1215 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
1216 | &imap, &nimaps, XFS_BMAPI_ENTIRE); | |
1da177e4 | 1217 | if (error) |
a206c817 CH |
1218 | goto out_unlock; |
1219 | ||
1220 | if (create && | |
1221 | (!nimaps || | |
1222 | (imap.br_startblock == HOLESTARTBLOCK || | |
1223 | imap.br_startblock == DELAYSTARTBLOCK))) { | |
aff3a9ed | 1224 | if (direct || xfs_get_extsz_hint(ip)) { |
507630b2 DC |
1225 | /* |
1226 | * Drop the ilock in preparation for starting the block | |
1227 | * allocation transaction. It will be retaken | |
1228 | * exclusively inside xfs_iomap_write_direct for the | |
1229 | * actual allocation. | |
1230 | */ | |
1231 | xfs_iunlock(ip, lockmode); | |
a206c817 CH |
1232 | error = xfs_iomap_write_direct(ip, offset, size, |
1233 | &imap, nimaps); | |
507630b2 DC |
1234 | if (error) |
1235 | return -error; | |
d3bc815a | 1236 | new = 1; |
a206c817 | 1237 | } else { |
507630b2 DC |
1238 | /* |
1239 | * Delalloc reservations do not require a transaction, | |
d3bc815a DC |
1240 | * we can go on without dropping the lock here. If we |
1241 | * are allocating a new delalloc block, make sure that | |
1242 | * we set the new flag so that we mark the buffer new so | |
1243 | * that we know that it is newly allocated if the write | |
1244 | * fails. | |
507630b2 | 1245 | */ |
d3bc815a DC |
1246 | if (nimaps && imap.br_startblock == HOLESTARTBLOCK) |
1247 | new = 1; | |
a206c817 | 1248 | error = xfs_iomap_write_delay(ip, offset, size, &imap); |
507630b2 DC |
1249 | if (error) |
1250 | goto out_unlock; | |
1251 | ||
1252 | xfs_iunlock(ip, lockmode); | |
a206c817 | 1253 | } |
a206c817 CH |
1254 | |
1255 | trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap); | |
1256 | } else if (nimaps) { | |
1257 | trace_xfs_get_blocks_found(ip, offset, size, 0, &imap); | |
507630b2 | 1258 | xfs_iunlock(ip, lockmode); |
a206c817 CH |
1259 | } else { |
1260 | trace_xfs_get_blocks_notfound(ip, offset, size); | |
1261 | goto out_unlock; | |
1262 | } | |
1da177e4 | 1263 | |
207d0416 CH |
1264 | if (imap.br_startblock != HOLESTARTBLOCK && |
1265 | imap.br_startblock != DELAYSTARTBLOCK) { | |
87cbc49c NS |
1266 | /* |
1267 | * For unwritten extents do not report a disk address on | |
1da177e4 LT |
1268 | * the read case (treat as if we're reading into a hole). |
1269 | */ | |
207d0416 CH |
1270 | if (create || !ISUNWRITTEN(&imap)) |
1271 | xfs_map_buffer(inode, bh_result, &imap, offset); | |
1272 | if (create && ISUNWRITTEN(&imap)) { | |
1da177e4 LT |
1273 | if (direct) |
1274 | bh_result->b_private = inode; | |
1275 | set_buffer_unwritten(bh_result); | |
1da177e4 LT |
1276 | } |
1277 | } | |
1278 | ||
c2536668 NS |
1279 | /* |
1280 | * If this is a realtime file, data may be on a different device. | |
1281 | * to that pointed to from the buffer_head b_bdev currently. | |
1282 | */ | |
046f1685 | 1283 | bh_result->b_bdev = xfs_find_bdev_for_inode(inode); |
1da177e4 | 1284 | |
c2536668 | 1285 | /* |
549054af DC |
1286 | * If we previously allocated a block out beyond eof and we are now |
1287 | * coming back to use it then we will need to flag it as new even if it | |
1288 | * has a disk address. | |
1289 | * | |
1290 | * With sub-block writes into unwritten extents we also need to mark | |
1291 | * the buffer as new so that the unwritten parts of the buffer gets | |
1292 | * correctly zeroed. | |
1da177e4 LT |
1293 | */ |
1294 | if (create && | |
1295 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || | |
549054af | 1296 | (offset >= i_size_read(inode)) || |
207d0416 | 1297 | (new || ISUNWRITTEN(&imap)))) |
1da177e4 | 1298 | set_buffer_new(bh_result); |
1da177e4 | 1299 | |
207d0416 | 1300 | if (imap.br_startblock == DELAYSTARTBLOCK) { |
1da177e4 LT |
1301 | BUG_ON(direct); |
1302 | if (create) { | |
1303 | set_buffer_uptodate(bh_result); | |
1304 | set_buffer_mapped(bh_result); | |
1305 | set_buffer_delay(bh_result); | |
1306 | } | |
1307 | } | |
1308 | ||
2b8f12b7 CH |
1309 | /* |
1310 | * If this is O_DIRECT or the mpage code calling tell them how large | |
1311 | * the mapping is, so that we can avoid repeated get_blocks calls. | |
1312 | */ | |
c2536668 | 1313 | if (direct || size > (1 << inode->i_blkbits)) { |
2b8f12b7 CH |
1314 | xfs_off_t mapping_size; |
1315 | ||
1316 | mapping_size = imap.br_startoff + imap.br_blockcount - iblock; | |
1317 | mapping_size <<= inode->i_blkbits; | |
1318 | ||
1319 | ASSERT(mapping_size > 0); | |
1320 | if (mapping_size > size) | |
1321 | mapping_size = size; | |
1322 | if (mapping_size > LONG_MAX) | |
1323 | mapping_size = LONG_MAX; | |
1324 | ||
1325 | bh_result->b_size = mapping_size; | |
1da177e4 LT |
1326 | } |
1327 | ||
1328 | return 0; | |
a206c817 CH |
1329 | |
1330 | out_unlock: | |
1331 | xfs_iunlock(ip, lockmode); | |
1332 | return -error; | |
1da177e4 LT |
1333 | } |
1334 | ||
1335 | int | |
c2536668 | 1336 | xfs_get_blocks( |
1da177e4 LT |
1337 | struct inode *inode, |
1338 | sector_t iblock, | |
1339 | struct buffer_head *bh_result, | |
1340 | int create) | |
1341 | { | |
f2bde9b8 | 1342 | return __xfs_get_blocks(inode, iblock, bh_result, create, 0); |
1da177e4 LT |
1343 | } |
1344 | ||
1345 | STATIC int | |
e4c573bb | 1346 | xfs_get_blocks_direct( |
1da177e4 LT |
1347 | struct inode *inode, |
1348 | sector_t iblock, | |
1da177e4 LT |
1349 | struct buffer_head *bh_result, |
1350 | int create) | |
1351 | { | |
f2bde9b8 | 1352 | return __xfs_get_blocks(inode, iblock, bh_result, create, 1); |
1da177e4 LT |
1353 | } |
1354 | ||
209fb87a CH |
1355 | /* |
1356 | * Complete a direct I/O write request. | |
1357 | * | |
1358 | * If the private argument is non-NULL __xfs_get_blocks signals us that we | |
1359 | * need to issue a transaction to convert the range from unwritten to written | |
1360 | * extents. In case this is regular synchronous I/O we just call xfs_end_io | |
25985edc | 1361 | * to do this and we are done. But in case this was a successful AIO |
209fb87a CH |
1362 | * request this handler is called from interrupt context, from which we |
1363 | * can't start transactions. In that case offload the I/O completion to | |
1364 | * the workqueues we also use for buffered I/O completion. | |
1365 | */ | |
f0973863 | 1366 | STATIC void |
209fb87a CH |
1367 | xfs_end_io_direct_write( |
1368 | struct kiocb *iocb, | |
1369 | loff_t offset, | |
1370 | ssize_t size, | |
1371 | void *private, | |
1372 | int ret, | |
1373 | bool is_async) | |
f0973863 | 1374 | { |
209fb87a | 1375 | struct xfs_ioend *ioend = iocb->private; |
f0973863 | 1376 | |
2813d682 CH |
1377 | /* |
1378 | * While the generic direct I/O code updates the inode size, it does | |
1379 | * so only after the end_io handler is called, which means our | |
1380 | * end_io handler thinks the on-disk size is outside the in-core | |
1381 | * size. To prevent this just update it a little bit earlier here. | |
1382 | */ | |
1383 | if (offset + size > i_size_read(ioend->io_inode)) | |
1384 | i_size_write(ioend->io_inode, offset + size); | |
1385 | ||
f0973863 | 1386 | /* |
209fb87a CH |
1387 | * blockdev_direct_IO can return an error even after the I/O |
1388 | * completion handler was called. Thus we need to protect | |
1389 | * against double-freeing. | |
f0973863 | 1390 | */ |
209fb87a CH |
1391 | iocb->private = NULL; |
1392 | ||
ba87ea69 LM |
1393 | ioend->io_offset = offset; |
1394 | ioend->io_size = size; | |
c859cdd1 CH |
1395 | ioend->io_iocb = iocb; |
1396 | ioend->io_result = ret; | |
209fb87a | 1397 | if (private && size > 0) |
0d882a36 | 1398 | ioend->io_type = XFS_IO_UNWRITTEN; |
209fb87a CH |
1399 | |
1400 | if (is_async) { | |
c859cdd1 | 1401 | ioend->io_isasync = 1; |
209fb87a | 1402 | xfs_finish_ioend(ioend); |
f0973863 | 1403 | } else { |
209fb87a | 1404 | xfs_finish_ioend_sync(ioend); |
f0973863 | 1405 | } |
f0973863 CH |
1406 | } |
1407 | ||
1da177e4 | 1408 | STATIC ssize_t |
e4c573bb | 1409 | xfs_vm_direct_IO( |
1da177e4 LT |
1410 | int rw, |
1411 | struct kiocb *iocb, | |
1412 | const struct iovec *iov, | |
1413 | loff_t offset, | |
1414 | unsigned long nr_segs) | |
1415 | { | |
209fb87a CH |
1416 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
1417 | struct block_device *bdev = xfs_find_bdev_for_inode(inode); | |
281627df | 1418 | struct xfs_ioend *ioend = NULL; |
209fb87a CH |
1419 | ssize_t ret; |
1420 | ||
1421 | if (rw & WRITE) { | |
281627df CH |
1422 | size_t size = iov_length(iov, nr_segs); |
1423 | ||
1424 | /* | |
437a255a DC |
1425 | * We cannot preallocate a size update transaction here as we |
1426 | * don't know whether allocation is necessary or not. Hence we | |
1427 | * can only tell IO completion that one is necessary if we are | |
1428 | * not doing unwritten extent conversion. | |
281627df | 1429 | */ |
0d882a36 | 1430 | iocb->private = ioend = xfs_alloc_ioend(inode, XFS_IO_DIRECT); |
437a255a | 1431 | if (offset + size > XFS_I(inode)->i_d.di_size) |
281627df | 1432 | ioend->io_isdirect = 1; |
209fb87a | 1433 | |
eafdc7d1 CH |
1434 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
1435 | offset, nr_segs, | |
1436 | xfs_get_blocks_direct, | |
1437 | xfs_end_io_direct_write, NULL, 0); | |
209fb87a | 1438 | if (ret != -EIOCBQUEUED && iocb->private) |
437a255a | 1439 | goto out_destroy_ioend; |
209fb87a | 1440 | } else { |
eafdc7d1 CH |
1441 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
1442 | offset, nr_segs, | |
1443 | xfs_get_blocks_direct, | |
1444 | NULL, NULL, 0); | |
209fb87a | 1445 | } |
f0973863 | 1446 | |
f0973863 | 1447 | return ret; |
281627df | 1448 | |
281627df CH |
1449 | out_destroy_ioend: |
1450 | xfs_destroy_ioend(ioend); | |
1451 | return ret; | |
1da177e4 LT |
1452 | } |
1453 | ||
d3bc815a DC |
1454 | /* |
1455 | * Punch out the delalloc blocks we have already allocated. | |
1456 | * | |
1457 | * Don't bother with xfs_setattr given that nothing can have made it to disk yet | |
1458 | * as the page is still locked at this point. | |
1459 | */ | |
1460 | STATIC void | |
1461 | xfs_vm_kill_delalloc_range( | |
1462 | struct inode *inode, | |
1463 | loff_t start, | |
1464 | loff_t end) | |
1465 | { | |
1466 | struct xfs_inode *ip = XFS_I(inode); | |
1467 | xfs_fileoff_t start_fsb; | |
1468 | xfs_fileoff_t end_fsb; | |
1469 | int error; | |
1470 | ||
1471 | start_fsb = XFS_B_TO_FSB(ip->i_mount, start); | |
1472 | end_fsb = XFS_B_TO_FSB(ip->i_mount, end); | |
1473 | if (end_fsb <= start_fsb) | |
1474 | return; | |
1475 | ||
1476 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1477 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, | |
1478 | end_fsb - start_fsb); | |
1479 | if (error) { | |
1480 | /* something screwed, just bail */ | |
1481 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
1482 | xfs_alert(ip->i_mount, | |
1483 | "xfs_vm_write_failed: unable to clean up ino %lld", | |
1484 | ip->i_ino); | |
1485 | } | |
1486 | } | |
1487 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1488 | } | |
1489 | ||
fa9b227e CH |
1490 | STATIC void |
1491 | xfs_vm_write_failed( | |
d3bc815a DC |
1492 | struct inode *inode, |
1493 | struct page *page, | |
1494 | loff_t pos, | |
1495 | unsigned len) | |
fa9b227e | 1496 | { |
d3bc815a DC |
1497 | loff_t block_offset = pos & PAGE_MASK; |
1498 | loff_t block_start; | |
1499 | loff_t block_end; | |
1500 | loff_t from = pos & (PAGE_CACHE_SIZE - 1); | |
1501 | loff_t to = from + len; | |
1502 | struct buffer_head *bh, *head; | |
fa9b227e | 1503 | |
d3bc815a | 1504 | ASSERT(block_offset + from == pos); |
c726de44 | 1505 | |
d3bc815a DC |
1506 | head = page_buffers(page); |
1507 | block_start = 0; | |
1508 | for (bh = head; bh != head || !block_start; | |
1509 | bh = bh->b_this_page, block_start = block_end, | |
1510 | block_offset += bh->b_size) { | |
1511 | block_end = block_start + bh->b_size; | |
c726de44 | 1512 | |
d3bc815a DC |
1513 | /* skip buffers before the write */ |
1514 | if (block_end <= from) | |
1515 | continue; | |
1516 | ||
1517 | /* if the buffer is after the write, we're done */ | |
1518 | if (block_start >= to) | |
1519 | break; | |
1520 | ||
1521 | if (!buffer_delay(bh)) | |
1522 | continue; | |
1523 | ||
1524 | if (!buffer_new(bh) && block_offset < i_size_read(inode)) | |
1525 | continue; | |
1526 | ||
1527 | xfs_vm_kill_delalloc_range(inode, block_offset, | |
1528 | block_offset + bh->b_size); | |
fa9b227e | 1529 | } |
d3bc815a | 1530 | |
fa9b227e CH |
1531 | } |
1532 | ||
d3bc815a DC |
1533 | /* |
1534 | * This used to call block_write_begin(), but it unlocks and releases the page | |
1535 | * on error, and we need that page to be able to punch stale delalloc blocks out | |
1536 | * on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at | |
1537 | * the appropriate point. | |
1538 | */ | |
f51623b2 | 1539 | STATIC int |
d79689c7 | 1540 | xfs_vm_write_begin( |
f51623b2 | 1541 | struct file *file, |
d79689c7 NP |
1542 | struct address_space *mapping, |
1543 | loff_t pos, | |
1544 | unsigned len, | |
1545 | unsigned flags, | |
1546 | struct page **pagep, | |
1547 | void **fsdata) | |
f51623b2 | 1548 | { |
d3bc815a DC |
1549 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
1550 | struct page *page; | |
1551 | int status; | |
155130a4 | 1552 | |
d3bc815a DC |
1553 | ASSERT(len <= PAGE_CACHE_SIZE); |
1554 | ||
1555 | page = grab_cache_page_write_begin(mapping, index, | |
1556 | flags | AOP_FLAG_NOFS); | |
1557 | if (!page) | |
1558 | return -ENOMEM; | |
1559 | ||
1560 | status = __block_write_begin(page, pos, len, xfs_get_blocks); | |
1561 | if (unlikely(status)) { | |
1562 | struct inode *inode = mapping->host; | |
1563 | ||
1564 | xfs_vm_write_failed(inode, page, pos, len); | |
1565 | unlock_page(page); | |
1566 | ||
1567 | if (pos + len > i_size_read(inode)) | |
1568 | truncate_pagecache(inode, pos + len, i_size_read(inode)); | |
1569 | ||
1570 | page_cache_release(page); | |
1571 | page = NULL; | |
1572 | } | |
1573 | ||
1574 | *pagep = page; | |
1575 | return status; | |
fa9b227e CH |
1576 | } |
1577 | ||
d3bc815a DC |
1578 | /* |
1579 | * On failure, we only need to kill delalloc blocks beyond EOF because they | |
1580 | * will never be written. For blocks within EOF, generic_write_end() zeros them | |
1581 | * so they are safe to leave alone and be written with all the other valid data. | |
1582 | */ | |
fa9b227e CH |
1583 | STATIC int |
1584 | xfs_vm_write_end( | |
1585 | struct file *file, | |
1586 | struct address_space *mapping, | |
1587 | loff_t pos, | |
1588 | unsigned len, | |
1589 | unsigned copied, | |
1590 | struct page *page, | |
1591 | void *fsdata) | |
1592 | { | |
1593 | int ret; | |
155130a4 | 1594 | |
d3bc815a DC |
1595 | ASSERT(len <= PAGE_CACHE_SIZE); |
1596 | ||
fa9b227e | 1597 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
d3bc815a DC |
1598 | if (unlikely(ret < len)) { |
1599 | struct inode *inode = mapping->host; | |
1600 | size_t isize = i_size_read(inode); | |
1601 | loff_t to = pos + len; | |
1602 | ||
1603 | if (to > isize) { | |
1604 | truncate_pagecache(inode, to, isize); | |
1605 | xfs_vm_kill_delalloc_range(inode, isize, to); | |
1606 | } | |
1607 | } | |
155130a4 | 1608 | return ret; |
f51623b2 | 1609 | } |
1da177e4 LT |
1610 | |
1611 | STATIC sector_t | |
e4c573bb | 1612 | xfs_vm_bmap( |
1da177e4 LT |
1613 | struct address_space *mapping, |
1614 | sector_t block) | |
1615 | { | |
1616 | struct inode *inode = (struct inode *)mapping->host; | |
739bfb2a | 1617 | struct xfs_inode *ip = XFS_I(inode); |
1da177e4 | 1618 | |
cca28fb8 | 1619 | trace_xfs_vm_bmap(XFS_I(inode)); |
126468b1 | 1620 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
4bc1ea6b | 1621 | filemap_write_and_wait(mapping); |
126468b1 | 1622 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
c2536668 | 1623 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
1da177e4 LT |
1624 | } |
1625 | ||
1626 | STATIC int | |
e4c573bb | 1627 | xfs_vm_readpage( |
1da177e4 LT |
1628 | struct file *unused, |
1629 | struct page *page) | |
1630 | { | |
c2536668 | 1631 | return mpage_readpage(page, xfs_get_blocks); |
1da177e4 LT |
1632 | } |
1633 | ||
1634 | STATIC int | |
e4c573bb | 1635 | xfs_vm_readpages( |
1da177e4 LT |
1636 | struct file *unused, |
1637 | struct address_space *mapping, | |
1638 | struct list_head *pages, | |
1639 | unsigned nr_pages) | |
1640 | { | |
c2536668 | 1641 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
1da177e4 LT |
1642 | } |
1643 | ||
f5e54d6e | 1644 | const struct address_space_operations xfs_address_space_operations = { |
e4c573bb NS |
1645 | .readpage = xfs_vm_readpage, |
1646 | .readpages = xfs_vm_readpages, | |
1647 | .writepage = xfs_vm_writepage, | |
7d4fb40a | 1648 | .writepages = xfs_vm_writepages, |
238f4c54 NS |
1649 | .releasepage = xfs_vm_releasepage, |
1650 | .invalidatepage = xfs_vm_invalidatepage, | |
d79689c7 | 1651 | .write_begin = xfs_vm_write_begin, |
fa9b227e | 1652 | .write_end = xfs_vm_write_end, |
e4c573bb NS |
1653 | .bmap = xfs_vm_bmap, |
1654 | .direct_IO = xfs_vm_direct_IO, | |
e965f963 | 1655 | .migratepage = buffer_migrate_page, |
bddaafa1 | 1656 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1657 | .error_remove_page = generic_error_remove_page, |
1da177e4 | 1658 | }; |