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) { |
04f658ee CH |
89 | if (ioend->io_isasync) { |
90 | aio_complete(ioend->io_iocb, ioend->io_error ? | |
91 | ioend->io_error : ioend->io_result, 0); | |
92 | } | |
c859cdd1 CH |
93 | inode_dio_done(ioend->io_inode); |
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 | ||
126 | /* | |
127 | * We hand off the transaction to the completion thread now, so | |
128 | * clear the flag here. | |
129 | */ | |
130 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
131 | return 0; | |
132 | } | |
133 | ||
ba87ea69 | 134 | /* |
2813d682 | 135 | * Update on-disk file size now that data has been written to disk. |
ba87ea69 | 136 | */ |
281627df | 137 | STATIC int |
ba87ea69 | 138 | xfs_setfilesize( |
aa6bf01d | 139 | struct xfs_ioend *ioend) |
ba87ea69 | 140 | { |
aa6bf01d | 141 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
281627df | 142 | struct xfs_trans *tp = ioend->io_append_trans; |
ba87ea69 | 143 | xfs_fsize_t isize; |
ba87ea69 | 144 | |
281627df CH |
145 | /* |
146 | * The transaction was allocated in the I/O submission thread, | |
147 | * thus we need to mark ourselves as beeing in a transaction | |
148 | * manually. | |
149 | */ | |
150 | current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
151 | ||
aa6bf01d | 152 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
6923e686 | 153 | isize = xfs_new_eof(ip, ioend->io_offset + ioend->io_size); |
281627df CH |
154 | if (!isize) { |
155 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
156 | xfs_trans_cancel(tp, 0); | |
157 | return 0; | |
ba87ea69 LM |
158 | } |
159 | ||
281627df CH |
160 | trace_xfs_setfilesize(ip, ioend->io_offset, ioend->io_size); |
161 | ||
162 | ip->i_d.di_size = isize; | |
163 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
164 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
165 | ||
166 | return xfs_trans_commit(tp, 0); | |
77d7a0c2 DC |
167 | } |
168 | ||
169 | /* | |
209fb87a | 170 | * Schedule IO completion handling on the final put of an ioend. |
fc0063c4 CH |
171 | * |
172 | * If there is no work to do we might as well call it a day and free the | |
173 | * ioend right now. | |
77d7a0c2 DC |
174 | */ |
175 | STATIC void | |
176 | xfs_finish_ioend( | |
209fb87a | 177 | struct xfs_ioend *ioend) |
77d7a0c2 DC |
178 | { |
179 | if (atomic_dec_and_test(&ioend->io_remaining)) { | |
aa6bf01d CH |
180 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
181 | ||
209fb87a | 182 | if (ioend->io_type == IO_UNWRITTEN) |
aa6bf01d | 183 | queue_work(mp->m_unwritten_workqueue, &ioend->io_work); |
281627df | 184 | else if (ioend->io_append_trans) |
aa6bf01d | 185 | queue_work(mp->m_data_workqueue, &ioend->io_work); |
fc0063c4 CH |
186 | else |
187 | xfs_destroy_ioend(ioend); | |
77d7a0c2 | 188 | } |
ba87ea69 LM |
189 | } |
190 | ||
0829c360 | 191 | /* |
5ec4fabb | 192 | * IO write completion. |
f6d6d4fc CH |
193 | */ |
194 | STATIC void | |
5ec4fabb | 195 | xfs_end_io( |
77d7a0c2 | 196 | struct work_struct *work) |
0829c360 | 197 | { |
77d7a0c2 DC |
198 | xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work); |
199 | struct xfs_inode *ip = XFS_I(ioend->io_inode); | |
69418932 | 200 | int error = 0; |
ba87ea69 | 201 | |
04f658ee | 202 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
810627d9 | 203 | ioend->io_error = -EIO; |
04f658ee CH |
204 | goto done; |
205 | } | |
206 | if (ioend->io_error) | |
207 | goto done; | |
208 | ||
5ec4fabb CH |
209 | /* |
210 | * For unwritten extents we need to issue transactions to convert a | |
211 | * range to normal written extens after the data I/O has finished. | |
212 | */ | |
04f658ee | 213 | if (ioend->io_type == IO_UNWRITTEN) { |
281627df CH |
214 | /* |
215 | * For buffered I/O we never preallocate a transaction when | |
216 | * doing the unwritten extent conversion, but for direct I/O | |
217 | * we do not know if we are converting an unwritten extent | |
218 | * or not at the point where we preallocate the transaction. | |
219 | */ | |
220 | if (ioend->io_append_trans) { | |
221 | ASSERT(ioend->io_isdirect); | |
222 | ||
223 | current_set_flags_nested( | |
224 | &ioend->io_append_trans->t_pflags, PF_FSTRANS); | |
225 | xfs_trans_cancel(ioend->io_append_trans, 0); | |
226 | } | |
227 | ||
5ec4fabb CH |
228 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, |
229 | ioend->io_size); | |
04f658ee CH |
230 | if (error) { |
231 | ioend->io_error = -error; | |
232 | goto done; | |
233 | } | |
281627df CH |
234 | } else if (ioend->io_append_trans) { |
235 | error = xfs_setfilesize(ioend); | |
236 | if (error) | |
237 | ioend->io_error = -error; | |
84803fb7 | 238 | } else { |
281627df | 239 | ASSERT(!xfs_ioend_is_append(ioend)); |
5ec4fabb | 240 | } |
ba87ea69 | 241 | |
04f658ee | 242 | done: |
aa6bf01d | 243 | xfs_destroy_ioend(ioend); |
c626d174 DC |
244 | } |
245 | ||
209fb87a CH |
246 | /* |
247 | * Call IO completion handling in caller context on the final put of an ioend. | |
248 | */ | |
249 | STATIC void | |
250 | xfs_finish_ioend_sync( | |
251 | struct xfs_ioend *ioend) | |
252 | { | |
253 | if (atomic_dec_and_test(&ioend->io_remaining)) | |
254 | xfs_end_io(&ioend->io_work); | |
255 | } | |
256 | ||
0829c360 CH |
257 | /* |
258 | * Allocate and initialise an IO completion structure. | |
259 | * We need to track unwritten extent write completion here initially. | |
260 | * We'll need to extend this for updating the ondisk inode size later | |
261 | * (vs. incore size). | |
262 | */ | |
263 | STATIC xfs_ioend_t * | |
264 | xfs_alloc_ioend( | |
f6d6d4fc CH |
265 | struct inode *inode, |
266 | unsigned int type) | |
0829c360 CH |
267 | { |
268 | xfs_ioend_t *ioend; | |
269 | ||
270 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); | |
271 | ||
272 | /* | |
273 | * Set the count to 1 initially, which will prevent an I/O | |
274 | * completion callback from happening before we have started | |
275 | * all the I/O from calling the completion routine too early. | |
276 | */ | |
277 | atomic_set(&ioend->io_remaining, 1); | |
c859cdd1 | 278 | ioend->io_isasync = 0; |
281627df | 279 | ioend->io_isdirect = 0; |
7d04a335 | 280 | ioend->io_error = 0; |
f6d6d4fc CH |
281 | ioend->io_list = NULL; |
282 | ioend->io_type = type; | |
b677c210 | 283 | ioend->io_inode = inode; |
c1a073bd | 284 | ioend->io_buffer_head = NULL; |
f6d6d4fc | 285 | ioend->io_buffer_tail = NULL; |
0829c360 CH |
286 | ioend->io_offset = 0; |
287 | ioend->io_size = 0; | |
fb511f21 CH |
288 | ioend->io_iocb = NULL; |
289 | ioend->io_result = 0; | |
281627df | 290 | ioend->io_append_trans = NULL; |
0829c360 | 291 | |
5ec4fabb | 292 | INIT_WORK(&ioend->io_work, xfs_end_io); |
0829c360 CH |
293 | return ioend; |
294 | } | |
295 | ||
1da177e4 LT |
296 | STATIC int |
297 | xfs_map_blocks( | |
298 | struct inode *inode, | |
299 | loff_t offset, | |
207d0416 | 300 | struct xfs_bmbt_irec *imap, |
a206c817 CH |
301 | int type, |
302 | int nonblocking) | |
1da177e4 | 303 | { |
a206c817 CH |
304 | struct xfs_inode *ip = XFS_I(inode); |
305 | struct xfs_mount *mp = ip->i_mount; | |
ed1e7b7e | 306 | ssize_t count = 1 << inode->i_blkbits; |
a206c817 CH |
307 | xfs_fileoff_t offset_fsb, end_fsb; |
308 | int error = 0; | |
a206c817 CH |
309 | int bmapi_flags = XFS_BMAPI_ENTIRE; |
310 | int nimaps = 1; | |
311 | ||
312 | if (XFS_FORCED_SHUTDOWN(mp)) | |
313 | return -XFS_ERROR(EIO); | |
314 | ||
8ff2957d | 315 | if (type == IO_UNWRITTEN) |
a206c817 | 316 | bmapi_flags |= XFS_BMAPI_IGSTATE; |
8ff2957d CH |
317 | |
318 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { | |
319 | if (nonblocking) | |
320 | return -XFS_ERROR(EAGAIN); | |
321 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
a206c817 CH |
322 | } |
323 | ||
8ff2957d CH |
324 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
325 | (ip->i_df.if_flags & XFS_IFEXTENTS)); | |
d2c28191 | 326 | ASSERT(offset <= mp->m_super->s_maxbytes); |
8ff2957d | 327 | |
d2c28191 DC |
328 | if (offset + count > mp->m_super->s_maxbytes) |
329 | count = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
330 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
331 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
5c8ed202 DC |
332 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
333 | imap, &nimaps, bmapi_flags); | |
8ff2957d | 334 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
a206c817 | 335 | |
8ff2957d CH |
336 | if (error) |
337 | return -XFS_ERROR(error); | |
a206c817 | 338 | |
8ff2957d CH |
339 | if (type == IO_DELALLOC && |
340 | (!nimaps || isnullstartblock(imap->br_startblock))) { | |
a206c817 CH |
341 | error = xfs_iomap_write_allocate(ip, offset, count, imap); |
342 | if (!error) | |
343 | trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); | |
8ff2957d | 344 | return -XFS_ERROR(error); |
a206c817 CH |
345 | } |
346 | ||
8ff2957d CH |
347 | #ifdef DEBUG |
348 | if (type == IO_UNWRITTEN) { | |
349 | ASSERT(nimaps); | |
350 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); | |
351 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
352 | } | |
353 | #endif | |
354 | if (nimaps) | |
355 | trace_xfs_map_blocks_found(ip, offset, count, type, imap); | |
356 | return 0; | |
1da177e4 LT |
357 | } |
358 | ||
b8f82a4a | 359 | STATIC int |
558e6891 | 360 | xfs_imap_valid( |
8699bb0a | 361 | struct inode *inode, |
207d0416 | 362 | struct xfs_bmbt_irec *imap, |
558e6891 | 363 | xfs_off_t offset) |
1da177e4 | 364 | { |
558e6891 | 365 | offset >>= inode->i_blkbits; |
8699bb0a | 366 | |
558e6891 CH |
367 | return offset >= imap->br_startoff && |
368 | offset < imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
369 | } |
370 | ||
f6d6d4fc CH |
371 | /* |
372 | * BIO completion handler for buffered IO. | |
373 | */ | |
782e3b3b | 374 | STATIC void |
f6d6d4fc CH |
375 | xfs_end_bio( |
376 | struct bio *bio, | |
f6d6d4fc CH |
377 | int error) |
378 | { | |
379 | xfs_ioend_t *ioend = bio->bi_private; | |
380 | ||
f6d6d4fc | 381 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
7d04a335 | 382 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
f6d6d4fc CH |
383 | |
384 | /* Toss bio and pass work off to an xfsdatad thread */ | |
f6d6d4fc CH |
385 | bio->bi_private = NULL; |
386 | bio->bi_end_io = NULL; | |
f6d6d4fc | 387 | bio_put(bio); |
7d04a335 | 388 | |
209fb87a | 389 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
390 | } |
391 | ||
392 | STATIC void | |
393 | xfs_submit_ioend_bio( | |
06342cf8 CH |
394 | struct writeback_control *wbc, |
395 | xfs_ioend_t *ioend, | |
396 | struct bio *bio) | |
f6d6d4fc CH |
397 | { |
398 | atomic_inc(&ioend->io_remaining); | |
f6d6d4fc CH |
399 | bio->bi_private = ioend; |
400 | bio->bi_end_io = xfs_end_bio; | |
721a9602 | 401 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio); |
f6d6d4fc CH |
402 | } |
403 | ||
404 | STATIC struct bio * | |
405 | xfs_alloc_ioend_bio( | |
406 | struct buffer_head *bh) | |
407 | { | |
f6d6d4fc | 408 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
221cb251 | 409 | struct bio *bio = bio_alloc(GFP_NOIO, nvecs); |
f6d6d4fc CH |
410 | |
411 | ASSERT(bio->bi_private == NULL); | |
412 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); | |
413 | bio->bi_bdev = bh->b_bdev; | |
f6d6d4fc CH |
414 | return bio; |
415 | } | |
416 | ||
417 | STATIC void | |
418 | xfs_start_buffer_writeback( | |
419 | struct buffer_head *bh) | |
420 | { | |
421 | ASSERT(buffer_mapped(bh)); | |
422 | ASSERT(buffer_locked(bh)); | |
423 | ASSERT(!buffer_delay(bh)); | |
424 | ASSERT(!buffer_unwritten(bh)); | |
425 | ||
426 | mark_buffer_async_write(bh); | |
427 | set_buffer_uptodate(bh); | |
428 | clear_buffer_dirty(bh); | |
429 | } | |
430 | ||
431 | STATIC void | |
432 | xfs_start_page_writeback( | |
433 | struct page *page, | |
f6d6d4fc CH |
434 | int clear_dirty, |
435 | int buffers) | |
436 | { | |
437 | ASSERT(PageLocked(page)); | |
438 | ASSERT(!PageWriteback(page)); | |
f6d6d4fc | 439 | if (clear_dirty) |
92132021 DC |
440 | clear_page_dirty_for_io(page); |
441 | set_page_writeback(page); | |
f6d6d4fc | 442 | unlock_page(page); |
1f7decf6 FW |
443 | /* If no buffers on the page are to be written, finish it here */ |
444 | if (!buffers) | |
f6d6d4fc | 445 | end_page_writeback(page); |
f6d6d4fc CH |
446 | } |
447 | ||
448 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) | |
449 | { | |
450 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
451 | } | |
452 | ||
453 | /* | |
d88992f6 DC |
454 | * Submit all of the bios for all of the ioends we have saved up, covering the |
455 | * initial writepage page and also any probed pages. | |
456 | * | |
457 | * Because we may have multiple ioends spanning a page, we need to start | |
458 | * writeback on all the buffers before we submit them for I/O. If we mark the | |
459 | * buffers as we got, then we can end up with a page that only has buffers | |
460 | * marked async write and I/O complete on can occur before we mark the other | |
461 | * buffers async write. | |
462 | * | |
463 | * The end result of this is that we trip a bug in end_page_writeback() because | |
464 | * we call it twice for the one page as the code in end_buffer_async_write() | |
465 | * assumes that all buffers on the page are started at the same time. | |
466 | * | |
467 | * The fix is two passes across the ioend list - one to start writeback on the | |
c41564b5 | 468 | * buffer_heads, and then submit them for I/O on the second pass. |
f6d6d4fc CH |
469 | */ |
470 | STATIC void | |
471 | xfs_submit_ioend( | |
06342cf8 | 472 | struct writeback_control *wbc, |
f6d6d4fc CH |
473 | xfs_ioend_t *ioend) |
474 | { | |
d88992f6 | 475 | xfs_ioend_t *head = ioend; |
f6d6d4fc CH |
476 | xfs_ioend_t *next; |
477 | struct buffer_head *bh; | |
478 | struct bio *bio; | |
479 | sector_t lastblock = 0; | |
480 | ||
d88992f6 DC |
481 | /* Pass 1 - start writeback */ |
482 | do { | |
483 | next = ioend->io_list; | |
221cb251 | 484 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) |
d88992f6 | 485 | xfs_start_buffer_writeback(bh); |
d88992f6 DC |
486 | } while ((ioend = next) != NULL); |
487 | ||
488 | /* Pass 2 - submit I/O */ | |
489 | ioend = head; | |
f6d6d4fc CH |
490 | do { |
491 | next = ioend->io_list; | |
492 | bio = NULL; | |
493 | ||
494 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { | |
f6d6d4fc CH |
495 | |
496 | if (!bio) { | |
497 | retry: | |
498 | bio = xfs_alloc_ioend_bio(bh); | |
499 | } else if (bh->b_blocknr != lastblock + 1) { | |
06342cf8 | 500 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
501 | goto retry; |
502 | } | |
503 | ||
504 | if (bio_add_buffer(bio, bh) != bh->b_size) { | |
06342cf8 | 505 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
506 | goto retry; |
507 | } | |
508 | ||
509 | lastblock = bh->b_blocknr; | |
510 | } | |
511 | if (bio) | |
06342cf8 | 512 | xfs_submit_ioend_bio(wbc, ioend, bio); |
209fb87a | 513 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
514 | } while ((ioend = next) != NULL); |
515 | } | |
516 | ||
517 | /* | |
518 | * Cancel submission of all buffer_heads so far in this endio. | |
519 | * Toss the endio too. Only ever called for the initial page | |
520 | * in a writepage request, so only ever one page. | |
521 | */ | |
522 | STATIC void | |
523 | xfs_cancel_ioend( | |
524 | xfs_ioend_t *ioend) | |
525 | { | |
526 | xfs_ioend_t *next; | |
527 | struct buffer_head *bh, *next_bh; | |
528 | ||
529 | do { | |
530 | next = ioend->io_list; | |
531 | bh = ioend->io_buffer_head; | |
532 | do { | |
533 | next_bh = bh->b_private; | |
534 | clear_buffer_async_write(bh); | |
535 | unlock_buffer(bh); | |
536 | } while ((bh = next_bh) != NULL); | |
537 | ||
f6d6d4fc CH |
538 | mempool_free(ioend, xfs_ioend_pool); |
539 | } while ((ioend = next) != NULL); | |
540 | } | |
541 | ||
542 | /* | |
543 | * Test to see if we've been building up a completion structure for | |
544 | * earlier buffers -- if so, we try to append to this ioend if we | |
545 | * can, otherwise we finish off any current ioend and start another. | |
546 | * Return true if we've finished the given ioend. | |
547 | */ | |
548 | STATIC void | |
549 | xfs_add_to_ioend( | |
550 | struct inode *inode, | |
551 | struct buffer_head *bh, | |
7336cea8 | 552 | xfs_off_t offset, |
f6d6d4fc CH |
553 | unsigned int type, |
554 | xfs_ioend_t **result, | |
555 | int need_ioend) | |
556 | { | |
557 | xfs_ioend_t *ioend = *result; | |
558 | ||
559 | if (!ioend || need_ioend || type != ioend->io_type) { | |
560 | xfs_ioend_t *previous = *result; | |
f6d6d4fc | 561 | |
f6d6d4fc CH |
562 | ioend = xfs_alloc_ioend(inode, type); |
563 | ioend->io_offset = offset; | |
564 | ioend->io_buffer_head = bh; | |
565 | ioend->io_buffer_tail = bh; | |
566 | if (previous) | |
567 | previous->io_list = ioend; | |
568 | *result = ioend; | |
569 | } else { | |
570 | ioend->io_buffer_tail->b_private = bh; | |
571 | ioend->io_buffer_tail = bh; | |
572 | } | |
573 | ||
574 | bh->b_private = NULL; | |
575 | ioend->io_size += bh->b_size; | |
576 | } | |
577 | ||
87cbc49c NS |
578 | STATIC void |
579 | xfs_map_buffer( | |
046f1685 | 580 | struct inode *inode, |
87cbc49c | 581 | struct buffer_head *bh, |
207d0416 | 582 | struct xfs_bmbt_irec *imap, |
046f1685 | 583 | xfs_off_t offset) |
87cbc49c NS |
584 | { |
585 | sector_t bn; | |
8699bb0a | 586 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
207d0416 CH |
587 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff); |
588 | xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), imap->br_startblock); | |
87cbc49c | 589 | |
207d0416 CH |
590 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
591 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
87cbc49c | 592 | |
e513182d | 593 | bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) + |
8699bb0a | 594 | ((offset - iomap_offset) >> inode->i_blkbits); |
87cbc49c | 595 | |
046f1685 | 596 | ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode))); |
87cbc49c NS |
597 | |
598 | bh->b_blocknr = bn; | |
599 | set_buffer_mapped(bh); | |
600 | } | |
601 | ||
1da177e4 LT |
602 | STATIC void |
603 | xfs_map_at_offset( | |
046f1685 | 604 | struct inode *inode, |
1da177e4 | 605 | struct buffer_head *bh, |
207d0416 | 606 | struct xfs_bmbt_irec *imap, |
046f1685 | 607 | xfs_off_t offset) |
1da177e4 | 608 | { |
207d0416 CH |
609 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
610 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
1da177e4 | 611 | |
207d0416 | 612 | xfs_map_buffer(inode, bh, imap, offset); |
1da177e4 LT |
613 | set_buffer_mapped(bh); |
614 | clear_buffer_delay(bh); | |
f6d6d4fc | 615 | clear_buffer_unwritten(bh); |
1da177e4 LT |
616 | } |
617 | ||
1da177e4 | 618 | /* |
10ce4444 CH |
619 | * Test if a given page is suitable for writing as part of an unwritten |
620 | * or delayed allocate extent. | |
1da177e4 | 621 | */ |
10ce4444 | 622 | STATIC int |
6ffc4db5 | 623 | xfs_check_page_type( |
10ce4444 | 624 | struct page *page, |
f6d6d4fc | 625 | unsigned int type) |
1da177e4 | 626 | { |
1da177e4 | 627 | if (PageWriteback(page)) |
10ce4444 | 628 | return 0; |
1da177e4 LT |
629 | |
630 | if (page->mapping && page_has_buffers(page)) { | |
631 | struct buffer_head *bh, *head; | |
632 | int acceptable = 0; | |
633 | ||
634 | bh = head = page_buffers(page); | |
635 | do { | |
f6d6d4fc | 636 | if (buffer_unwritten(bh)) |
6ffc4db5 | 637 | acceptable += (type == IO_UNWRITTEN); |
f6d6d4fc | 638 | else if (buffer_delay(bh)) |
6ffc4db5 | 639 | acceptable += (type == IO_DELALLOC); |
2ddee844 | 640 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
6ffc4db5 | 641 | acceptable += (type == IO_OVERWRITE); |
f6d6d4fc | 642 | else |
1da177e4 | 643 | break; |
1da177e4 LT |
644 | } while ((bh = bh->b_this_page) != head); |
645 | ||
646 | if (acceptable) | |
10ce4444 | 647 | return 1; |
1da177e4 LT |
648 | } |
649 | ||
10ce4444 | 650 | return 0; |
1da177e4 LT |
651 | } |
652 | ||
1da177e4 LT |
653 | /* |
654 | * Allocate & map buffers for page given the extent map. Write it out. | |
655 | * except for the original page of a writepage, this is called on | |
656 | * delalloc/unwritten pages only, for the original page it is possible | |
657 | * that the page has no mapping at all. | |
658 | */ | |
f6d6d4fc | 659 | STATIC int |
1da177e4 LT |
660 | xfs_convert_page( |
661 | struct inode *inode, | |
662 | struct page *page, | |
10ce4444 | 663 | loff_t tindex, |
207d0416 | 664 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 665 | xfs_ioend_t **ioendp, |
2fa24f92 | 666 | struct writeback_control *wbc) |
1da177e4 | 667 | { |
f6d6d4fc | 668 | struct buffer_head *bh, *head; |
9260dc6b CH |
669 | xfs_off_t end_offset; |
670 | unsigned long p_offset; | |
f6d6d4fc | 671 | unsigned int type; |
24e17b5f | 672 | int len, page_dirty; |
f6d6d4fc | 673 | int count = 0, done = 0, uptodate = 1; |
9260dc6b | 674 | xfs_off_t offset = page_offset(page); |
1da177e4 | 675 | |
10ce4444 CH |
676 | if (page->index != tindex) |
677 | goto fail; | |
529ae9aa | 678 | if (!trylock_page(page)) |
10ce4444 CH |
679 | goto fail; |
680 | if (PageWriteback(page)) | |
681 | goto fail_unlock_page; | |
682 | if (page->mapping != inode->i_mapping) | |
683 | goto fail_unlock_page; | |
6ffc4db5 | 684 | if (!xfs_check_page_type(page, (*ioendp)->io_type)) |
10ce4444 CH |
685 | goto fail_unlock_page; |
686 | ||
24e17b5f NS |
687 | /* |
688 | * page_dirty is initially a count of buffers on the page before | |
c41564b5 | 689 | * EOF and is decremented as we move each into a cleanable state. |
9260dc6b CH |
690 | * |
691 | * Derivation: | |
692 | * | |
693 | * End offset is the highest offset that this page should represent. | |
694 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
695 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
696 | * hence give us the correct page_dirty count. On any other page, | |
697 | * it will be zero and in that case we need page_dirty to be the | |
698 | * count of buffers on the page. | |
24e17b5f | 699 | */ |
9260dc6b CH |
700 | end_offset = min_t(unsigned long long, |
701 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, | |
702 | i_size_read(inode)); | |
703 | ||
24e17b5f | 704 | len = 1 << inode->i_blkbits; |
9260dc6b CH |
705 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
706 | PAGE_CACHE_SIZE); | |
707 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
708 | page_dirty = p_offset / len; | |
24e17b5f | 709 | |
1da177e4 LT |
710 | bh = head = page_buffers(page); |
711 | do { | |
9260dc6b | 712 | if (offset >= end_offset) |
1da177e4 | 713 | break; |
f6d6d4fc CH |
714 | if (!buffer_uptodate(bh)) |
715 | uptodate = 0; | |
716 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { | |
717 | done = 1; | |
1da177e4 | 718 | continue; |
f6d6d4fc CH |
719 | } |
720 | ||
2fa24f92 CH |
721 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
722 | buffer_mapped(bh)) { | |
9260dc6b | 723 | if (buffer_unwritten(bh)) |
34a52c6c | 724 | type = IO_UNWRITTEN; |
2fa24f92 | 725 | else if (buffer_delay(bh)) |
a206c817 | 726 | type = IO_DELALLOC; |
2fa24f92 CH |
727 | else |
728 | type = IO_OVERWRITE; | |
9260dc6b | 729 | |
558e6891 | 730 | if (!xfs_imap_valid(inode, imap, offset)) { |
f6d6d4fc | 731 | done = 1; |
9260dc6b CH |
732 | continue; |
733 | } | |
734 | ||
ecff71e6 CH |
735 | lock_buffer(bh); |
736 | if (type != IO_OVERWRITE) | |
2fa24f92 | 737 | xfs_map_at_offset(inode, bh, imap, offset); |
89f3b363 CH |
738 | xfs_add_to_ioend(inode, bh, offset, type, |
739 | ioendp, done); | |
740 | ||
9260dc6b CH |
741 | page_dirty--; |
742 | count++; | |
743 | } else { | |
2fa24f92 | 744 | done = 1; |
1da177e4 | 745 | } |
7336cea8 | 746 | } while (offset += len, (bh = bh->b_this_page) != head); |
1da177e4 | 747 | |
f6d6d4fc CH |
748 | if (uptodate && bh == head) |
749 | SetPageUptodate(page); | |
750 | ||
89f3b363 | 751 | if (count) { |
efceab1d DC |
752 | if (--wbc->nr_to_write <= 0 && |
753 | wbc->sync_mode == WB_SYNC_NONE) | |
89f3b363 | 754 | done = 1; |
1da177e4 | 755 | } |
89f3b363 | 756 | xfs_start_page_writeback(page, !page_dirty, count); |
f6d6d4fc CH |
757 | |
758 | return done; | |
10ce4444 CH |
759 | fail_unlock_page: |
760 | unlock_page(page); | |
761 | fail: | |
762 | return 1; | |
1da177e4 LT |
763 | } |
764 | ||
765 | /* | |
766 | * Convert & write out a cluster of pages in the same extent as defined | |
767 | * by mp and following the start page. | |
768 | */ | |
769 | STATIC void | |
770 | xfs_cluster_write( | |
771 | struct inode *inode, | |
772 | pgoff_t tindex, | |
207d0416 | 773 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 774 | xfs_ioend_t **ioendp, |
1da177e4 | 775 | struct writeback_control *wbc, |
1da177e4 LT |
776 | pgoff_t tlast) |
777 | { | |
10ce4444 CH |
778 | struct pagevec pvec; |
779 | int done = 0, i; | |
1da177e4 | 780 | |
10ce4444 CH |
781 | pagevec_init(&pvec, 0); |
782 | while (!done && tindex <= tlast) { | |
783 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
784 | ||
785 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
1da177e4 | 786 | break; |
10ce4444 CH |
787 | |
788 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
789 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, | |
2fa24f92 | 790 | imap, ioendp, wbc); |
10ce4444 CH |
791 | if (done) |
792 | break; | |
793 | } | |
794 | ||
795 | pagevec_release(&pvec); | |
796 | cond_resched(); | |
1da177e4 LT |
797 | } |
798 | } | |
799 | ||
3ed3a434 DC |
800 | STATIC void |
801 | xfs_vm_invalidatepage( | |
802 | struct page *page, | |
803 | unsigned long offset) | |
804 | { | |
805 | trace_xfs_invalidatepage(page->mapping->host, page, offset); | |
806 | block_invalidatepage(page, offset); | |
807 | } | |
808 | ||
809 | /* | |
810 | * If the page has delalloc buffers on it, we need to punch them out before we | |
811 | * invalidate the page. If we don't, we leave a stale delalloc mapping on the | |
812 | * inode that can trip a BUG() in xfs_get_blocks() later on if a direct IO read | |
813 | * is done on that same region - the delalloc extent is returned when none is | |
814 | * supposed to be there. | |
815 | * | |
816 | * We prevent this by truncating away the delalloc regions on the page before | |
817 | * invalidating it. Because they are delalloc, we can do this without needing a | |
818 | * transaction. Indeed - if we get ENOSPC errors, we have to be able to do this | |
819 | * truncation without a transaction as there is no space left for block | |
820 | * reservation (typically why we see a ENOSPC in writeback). | |
821 | * | |
822 | * This is not a performance critical path, so for now just do the punching a | |
823 | * buffer head at a time. | |
824 | */ | |
825 | STATIC void | |
826 | xfs_aops_discard_page( | |
827 | struct page *page) | |
828 | { | |
829 | struct inode *inode = page->mapping->host; | |
830 | struct xfs_inode *ip = XFS_I(inode); | |
831 | struct buffer_head *bh, *head; | |
832 | loff_t offset = page_offset(page); | |
3ed3a434 | 833 | |
6ffc4db5 | 834 | if (!xfs_check_page_type(page, IO_DELALLOC)) |
3ed3a434 DC |
835 | goto out_invalidate; |
836 | ||
e8c3753c DC |
837 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
838 | goto out_invalidate; | |
839 | ||
4f10700a | 840 | xfs_alert(ip->i_mount, |
3ed3a434 DC |
841 | "page discard on page %p, inode 0x%llx, offset %llu.", |
842 | page, ip->i_ino, offset); | |
843 | ||
844 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
845 | bh = head = page_buffers(page); | |
846 | do { | |
3ed3a434 | 847 | int error; |
c726de44 | 848 | xfs_fileoff_t start_fsb; |
3ed3a434 DC |
849 | |
850 | if (!buffer_delay(bh)) | |
851 | goto next_buffer; | |
852 | ||
c726de44 DC |
853 | start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); |
854 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1); | |
3ed3a434 DC |
855 | if (error) { |
856 | /* something screwed, just bail */ | |
e8c3753c | 857 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
4f10700a | 858 | xfs_alert(ip->i_mount, |
3ed3a434 | 859 | "page discard unable to remove delalloc mapping."); |
e8c3753c | 860 | } |
3ed3a434 DC |
861 | break; |
862 | } | |
863 | next_buffer: | |
c726de44 | 864 | offset += 1 << inode->i_blkbits; |
3ed3a434 DC |
865 | |
866 | } while ((bh = bh->b_this_page) != head); | |
867 | ||
868 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
869 | out_invalidate: | |
870 | xfs_vm_invalidatepage(page, 0); | |
871 | return; | |
872 | } | |
873 | ||
1da177e4 | 874 | /* |
89f3b363 CH |
875 | * Write out a dirty page. |
876 | * | |
877 | * For delalloc space on the page we need to allocate space and flush it. | |
878 | * For unwritten space on the page we need to start the conversion to | |
879 | * regular allocated space. | |
89f3b363 | 880 | * For any other dirty buffer heads on the page we should flush them. |
1da177e4 | 881 | */ |
1da177e4 | 882 | STATIC int |
89f3b363 CH |
883 | xfs_vm_writepage( |
884 | struct page *page, | |
885 | struct writeback_control *wbc) | |
1da177e4 | 886 | { |
89f3b363 | 887 | struct inode *inode = page->mapping->host; |
f6d6d4fc | 888 | struct buffer_head *bh, *head; |
207d0416 | 889 | struct xfs_bmbt_irec imap; |
f6d6d4fc | 890 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
1da177e4 | 891 | loff_t offset; |
f6d6d4fc | 892 | unsigned int type; |
1da177e4 | 893 | __uint64_t end_offset; |
bd1556a1 | 894 | pgoff_t end_index, last_index; |
ed1e7b7e | 895 | ssize_t len; |
a206c817 | 896 | int err, imap_valid = 0, uptodate = 1; |
89f3b363 | 897 | int count = 0; |
a206c817 | 898 | int nonblocking = 0; |
89f3b363 CH |
899 | |
900 | trace_xfs_writepage(inode, page, 0); | |
901 | ||
20cb52eb CH |
902 | ASSERT(page_has_buffers(page)); |
903 | ||
89f3b363 CH |
904 | /* |
905 | * Refuse to write the page out if we are called from reclaim context. | |
906 | * | |
d4f7a5cb CH |
907 | * This avoids stack overflows when called from deeply used stacks in |
908 | * random callers for direct reclaim or memcg reclaim. We explicitly | |
909 | * allow reclaim from kswapd as the stack usage there is relatively low. | |
89f3b363 | 910 | * |
94054fa3 MG |
911 | * This should never happen except in the case of a VM regression so |
912 | * warn about it. | |
89f3b363 | 913 | */ |
94054fa3 MG |
914 | if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == |
915 | PF_MEMALLOC)) | |
b5420f23 | 916 | goto redirty; |
1da177e4 | 917 | |
89f3b363 | 918 | /* |
680a647b CH |
919 | * Given that we do not allow direct reclaim to call us, we should |
920 | * never be called while in a filesystem transaction. | |
89f3b363 | 921 | */ |
680a647b | 922 | if (WARN_ON(current->flags & PF_FSTRANS)) |
b5420f23 | 923 | goto redirty; |
89f3b363 | 924 | |
1da177e4 LT |
925 | /* Is this page beyond the end of the file? */ |
926 | offset = i_size_read(inode); | |
927 | end_index = offset >> PAGE_CACHE_SHIFT; | |
928 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; | |
929 | if (page->index >= end_index) { | |
930 | if ((page->index >= end_index + 1) || | |
931 | !(i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) { | |
89f3b363 | 932 | unlock_page(page); |
19d5bcf3 | 933 | return 0; |
1da177e4 LT |
934 | } |
935 | } | |
936 | ||
f6d6d4fc | 937 | end_offset = min_t(unsigned long long, |
20cb52eb CH |
938 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
939 | offset); | |
24e17b5f | 940 | len = 1 << inode->i_blkbits; |
24e17b5f | 941 | |
24e17b5f | 942 | bh = head = page_buffers(page); |
f6d6d4fc | 943 | offset = page_offset(page); |
a206c817 CH |
944 | type = IO_OVERWRITE; |
945 | ||
dbcdde3e | 946 | if (wbc->sync_mode == WB_SYNC_NONE) |
a206c817 | 947 | nonblocking = 1; |
f6d6d4fc | 948 | |
1da177e4 | 949 | do { |
6ac7248e CH |
950 | int new_ioend = 0; |
951 | ||
1da177e4 LT |
952 | if (offset >= end_offset) |
953 | break; | |
954 | if (!buffer_uptodate(bh)) | |
955 | uptodate = 0; | |
1da177e4 | 956 | |
3d9b02e3 | 957 | /* |
ece413f5 CH |
958 | * set_page_dirty dirties all buffers in a page, independent |
959 | * of their state. The dirty state however is entirely | |
960 | * meaningless for holes (!mapped && uptodate), so skip | |
961 | * buffers covering holes here. | |
3d9b02e3 ES |
962 | */ |
963 | if (!buffer_mapped(bh) && buffer_uptodate(bh)) { | |
3d9b02e3 ES |
964 | imap_valid = 0; |
965 | continue; | |
966 | } | |
967 | ||
aeea1b1f CH |
968 | if (buffer_unwritten(bh)) { |
969 | if (type != IO_UNWRITTEN) { | |
970 | type = IO_UNWRITTEN; | |
971 | imap_valid = 0; | |
1da177e4 | 972 | } |
aeea1b1f CH |
973 | } else if (buffer_delay(bh)) { |
974 | if (type != IO_DELALLOC) { | |
975 | type = IO_DELALLOC; | |
976 | imap_valid = 0; | |
1da177e4 | 977 | } |
89f3b363 | 978 | } else if (buffer_uptodate(bh)) { |
a206c817 CH |
979 | if (type != IO_OVERWRITE) { |
980 | type = IO_OVERWRITE; | |
85da94c6 CH |
981 | imap_valid = 0; |
982 | } | |
aeea1b1f | 983 | } else { |
7d0fa3ec | 984 | if (PageUptodate(page)) |
aeea1b1f | 985 | ASSERT(buffer_mapped(bh)); |
7d0fa3ec AR |
986 | /* |
987 | * This buffer is not uptodate and will not be | |
988 | * written to disk. Ensure that we will put any | |
989 | * subsequent writeable buffers into a new | |
990 | * ioend. | |
991 | */ | |
992 | imap_valid = 0; | |
aeea1b1f CH |
993 | continue; |
994 | } | |
d5cb48aa | 995 | |
aeea1b1f CH |
996 | if (imap_valid) |
997 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
998 | if (!imap_valid) { | |
999 | /* | |
1000 | * If we didn't have a valid mapping then we need to | |
1001 | * put the new mapping into a separate ioend structure. | |
1002 | * This ensures non-contiguous extents always have | |
1003 | * separate ioends, which is particularly important | |
1004 | * for unwritten extent conversion at I/O completion | |
1005 | * time. | |
1006 | */ | |
1007 | new_ioend = 1; | |
1008 | err = xfs_map_blocks(inode, offset, &imap, type, | |
1009 | nonblocking); | |
1010 | if (err) | |
1011 | goto error; | |
1012 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1013 | } | |
1014 | if (imap_valid) { | |
ecff71e6 CH |
1015 | lock_buffer(bh); |
1016 | if (type != IO_OVERWRITE) | |
aeea1b1f CH |
1017 | xfs_map_at_offset(inode, bh, &imap, offset); |
1018 | xfs_add_to_ioend(inode, bh, offset, type, &ioend, | |
1019 | new_ioend); | |
1020 | count++; | |
1da177e4 | 1021 | } |
f6d6d4fc CH |
1022 | |
1023 | if (!iohead) | |
1024 | iohead = ioend; | |
1025 | ||
1026 | } while (offset += len, ((bh = bh->b_this_page) != head)); | |
1da177e4 LT |
1027 | |
1028 | if (uptodate && bh == head) | |
1029 | SetPageUptodate(page); | |
1030 | ||
89f3b363 | 1031 | xfs_start_page_writeback(page, 1, count); |
1da177e4 | 1032 | |
558e6891 | 1033 | if (ioend && imap_valid) { |
bd1556a1 CH |
1034 | xfs_off_t end_index; |
1035 | ||
1036 | end_index = imap.br_startoff + imap.br_blockcount; | |
1037 | ||
1038 | /* to bytes */ | |
1039 | end_index <<= inode->i_blkbits; | |
1040 | ||
1041 | /* to pages */ | |
1042 | end_index = (end_index - 1) >> PAGE_CACHE_SHIFT; | |
1043 | ||
1044 | /* check against file size */ | |
1045 | if (end_index > last_index) | |
1046 | end_index = last_index; | |
8699bb0a | 1047 | |
207d0416 | 1048 | xfs_cluster_write(inode, page->index + 1, &imap, &ioend, |
2fa24f92 | 1049 | wbc, end_index); |
1da177e4 LT |
1050 | } |
1051 | ||
281627df CH |
1052 | if (iohead) { |
1053 | /* | |
1054 | * Reserve log space if we might write beyond the on-disk | |
1055 | * inode size. | |
1056 | */ | |
1057 | if (ioend->io_type != IO_UNWRITTEN && | |
1058 | xfs_ioend_is_append(ioend)) { | |
1059 | err = xfs_setfilesize_trans_alloc(ioend); | |
1060 | if (err) | |
1061 | goto error; | |
1062 | } | |
1063 | ||
06342cf8 | 1064 | xfs_submit_ioend(wbc, iohead); |
281627df | 1065 | } |
f6d6d4fc | 1066 | |
89f3b363 | 1067 | return 0; |
1da177e4 LT |
1068 | |
1069 | error: | |
f6d6d4fc CH |
1070 | if (iohead) |
1071 | xfs_cancel_ioend(iohead); | |
1da177e4 | 1072 | |
b5420f23 CH |
1073 | if (err == -EAGAIN) |
1074 | goto redirty; | |
1075 | ||
20cb52eb | 1076 | xfs_aops_discard_page(page); |
89f3b363 CH |
1077 | ClearPageUptodate(page); |
1078 | unlock_page(page); | |
1da177e4 | 1079 | return err; |
f51623b2 | 1080 | |
b5420f23 | 1081 | redirty: |
f51623b2 NS |
1082 | redirty_page_for_writepage(wbc, page); |
1083 | unlock_page(page); | |
1084 | return 0; | |
f51623b2 NS |
1085 | } |
1086 | ||
7d4fb40a NS |
1087 | STATIC int |
1088 | xfs_vm_writepages( | |
1089 | struct address_space *mapping, | |
1090 | struct writeback_control *wbc) | |
1091 | { | |
b3aea4ed | 1092 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
7d4fb40a NS |
1093 | return generic_writepages(mapping, wbc); |
1094 | } | |
1095 | ||
f51623b2 NS |
1096 | /* |
1097 | * Called to move a page into cleanable state - and from there | |
89f3b363 | 1098 | * to be released. The page should already be clean. We always |
f51623b2 NS |
1099 | * have buffer heads in this call. |
1100 | * | |
89f3b363 | 1101 | * Returns 1 if the page is ok to release, 0 otherwise. |
f51623b2 NS |
1102 | */ |
1103 | STATIC int | |
238f4c54 | 1104 | xfs_vm_releasepage( |
f51623b2 NS |
1105 | struct page *page, |
1106 | gfp_t gfp_mask) | |
1107 | { | |
20cb52eb | 1108 | int delalloc, unwritten; |
f51623b2 | 1109 | |
89f3b363 | 1110 | trace_xfs_releasepage(page->mapping->host, page, 0); |
238f4c54 | 1111 | |
20cb52eb | 1112 | xfs_count_page_state(page, &delalloc, &unwritten); |
f51623b2 | 1113 | |
89f3b363 | 1114 | if (WARN_ON(delalloc)) |
f51623b2 | 1115 | return 0; |
89f3b363 | 1116 | if (WARN_ON(unwritten)) |
f51623b2 NS |
1117 | return 0; |
1118 | ||
f51623b2 NS |
1119 | return try_to_free_buffers(page); |
1120 | } | |
1121 | ||
1da177e4 | 1122 | STATIC int |
c2536668 | 1123 | __xfs_get_blocks( |
1da177e4 LT |
1124 | struct inode *inode, |
1125 | sector_t iblock, | |
1da177e4 LT |
1126 | struct buffer_head *bh_result, |
1127 | int create, | |
f2bde9b8 | 1128 | int direct) |
1da177e4 | 1129 | { |
a206c817 CH |
1130 | struct xfs_inode *ip = XFS_I(inode); |
1131 | struct xfs_mount *mp = ip->i_mount; | |
1132 | xfs_fileoff_t offset_fsb, end_fsb; | |
1133 | int error = 0; | |
1134 | int lockmode = 0; | |
207d0416 | 1135 | struct xfs_bmbt_irec imap; |
a206c817 | 1136 | int nimaps = 1; |
fdc7ed75 NS |
1137 | xfs_off_t offset; |
1138 | ssize_t size; | |
207d0416 | 1139 | int new = 0; |
a206c817 CH |
1140 | |
1141 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1142 | return -XFS_ERROR(EIO); | |
1da177e4 | 1143 | |
fdc7ed75 | 1144 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
c2536668 NS |
1145 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
1146 | size = bh_result->b_size; | |
364f358a LM |
1147 | |
1148 | if (!create && direct && offset >= i_size_read(inode)) | |
1149 | return 0; | |
1150 | ||
507630b2 DC |
1151 | /* |
1152 | * Direct I/O is usually done on preallocated files, so try getting | |
1153 | * a block mapping without an exclusive lock first. For buffered | |
1154 | * writes we already have the exclusive iolock anyway, so avoiding | |
1155 | * a lock roundtrip here by taking the ilock exclusive from the | |
1156 | * beginning is a useful micro optimization. | |
1157 | */ | |
1158 | if (create && !direct) { | |
a206c817 CH |
1159 | lockmode = XFS_ILOCK_EXCL; |
1160 | xfs_ilock(ip, lockmode); | |
1161 | } else { | |
1162 | lockmode = xfs_ilock_map_shared(ip); | |
1163 | } | |
f2bde9b8 | 1164 | |
d2c28191 DC |
1165 | ASSERT(offset <= mp->m_super->s_maxbytes); |
1166 | if (offset + size > mp->m_super->s_maxbytes) | |
1167 | size = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
1168 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); |
1169 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1170 | ||
5c8ed202 DC |
1171 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
1172 | &imap, &nimaps, XFS_BMAPI_ENTIRE); | |
1da177e4 | 1173 | if (error) |
a206c817 CH |
1174 | goto out_unlock; |
1175 | ||
1176 | if (create && | |
1177 | (!nimaps || | |
1178 | (imap.br_startblock == HOLESTARTBLOCK || | |
1179 | imap.br_startblock == DELAYSTARTBLOCK))) { | |
aff3a9ed | 1180 | if (direct || xfs_get_extsz_hint(ip)) { |
507630b2 DC |
1181 | /* |
1182 | * Drop the ilock in preparation for starting the block | |
1183 | * allocation transaction. It will be retaken | |
1184 | * exclusively inside xfs_iomap_write_direct for the | |
1185 | * actual allocation. | |
1186 | */ | |
1187 | xfs_iunlock(ip, lockmode); | |
a206c817 CH |
1188 | error = xfs_iomap_write_direct(ip, offset, size, |
1189 | &imap, nimaps); | |
507630b2 DC |
1190 | if (error) |
1191 | return -error; | |
d3bc815a | 1192 | new = 1; |
a206c817 | 1193 | } else { |
507630b2 DC |
1194 | /* |
1195 | * Delalloc reservations do not require a transaction, | |
d3bc815a DC |
1196 | * we can go on without dropping the lock here. If we |
1197 | * are allocating a new delalloc block, make sure that | |
1198 | * we set the new flag so that we mark the buffer new so | |
1199 | * that we know that it is newly allocated if the write | |
1200 | * fails. | |
507630b2 | 1201 | */ |
d3bc815a DC |
1202 | if (nimaps && imap.br_startblock == HOLESTARTBLOCK) |
1203 | new = 1; | |
a206c817 | 1204 | error = xfs_iomap_write_delay(ip, offset, size, &imap); |
507630b2 DC |
1205 | if (error) |
1206 | goto out_unlock; | |
1207 | ||
1208 | xfs_iunlock(ip, lockmode); | |
a206c817 | 1209 | } |
a206c817 CH |
1210 | |
1211 | trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap); | |
1212 | } else if (nimaps) { | |
1213 | trace_xfs_get_blocks_found(ip, offset, size, 0, &imap); | |
507630b2 | 1214 | xfs_iunlock(ip, lockmode); |
a206c817 CH |
1215 | } else { |
1216 | trace_xfs_get_blocks_notfound(ip, offset, size); | |
1217 | goto out_unlock; | |
1218 | } | |
1da177e4 | 1219 | |
207d0416 CH |
1220 | if (imap.br_startblock != HOLESTARTBLOCK && |
1221 | imap.br_startblock != DELAYSTARTBLOCK) { | |
87cbc49c NS |
1222 | /* |
1223 | * For unwritten extents do not report a disk address on | |
1da177e4 LT |
1224 | * the read case (treat as if we're reading into a hole). |
1225 | */ | |
207d0416 CH |
1226 | if (create || !ISUNWRITTEN(&imap)) |
1227 | xfs_map_buffer(inode, bh_result, &imap, offset); | |
1228 | if (create && ISUNWRITTEN(&imap)) { | |
1da177e4 LT |
1229 | if (direct) |
1230 | bh_result->b_private = inode; | |
1231 | set_buffer_unwritten(bh_result); | |
1da177e4 LT |
1232 | } |
1233 | } | |
1234 | ||
c2536668 NS |
1235 | /* |
1236 | * If this is a realtime file, data may be on a different device. | |
1237 | * to that pointed to from the buffer_head b_bdev currently. | |
1238 | */ | |
046f1685 | 1239 | bh_result->b_bdev = xfs_find_bdev_for_inode(inode); |
1da177e4 | 1240 | |
c2536668 | 1241 | /* |
549054af DC |
1242 | * If we previously allocated a block out beyond eof and we are now |
1243 | * coming back to use it then we will need to flag it as new even if it | |
1244 | * has a disk address. | |
1245 | * | |
1246 | * With sub-block writes into unwritten extents we also need to mark | |
1247 | * the buffer as new so that the unwritten parts of the buffer gets | |
1248 | * correctly zeroed. | |
1da177e4 LT |
1249 | */ |
1250 | if (create && | |
1251 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || | |
549054af | 1252 | (offset >= i_size_read(inode)) || |
207d0416 | 1253 | (new || ISUNWRITTEN(&imap)))) |
1da177e4 | 1254 | set_buffer_new(bh_result); |
1da177e4 | 1255 | |
207d0416 | 1256 | if (imap.br_startblock == DELAYSTARTBLOCK) { |
1da177e4 LT |
1257 | BUG_ON(direct); |
1258 | if (create) { | |
1259 | set_buffer_uptodate(bh_result); | |
1260 | set_buffer_mapped(bh_result); | |
1261 | set_buffer_delay(bh_result); | |
1262 | } | |
1263 | } | |
1264 | ||
2b8f12b7 CH |
1265 | /* |
1266 | * If this is O_DIRECT or the mpage code calling tell them how large | |
1267 | * the mapping is, so that we can avoid repeated get_blocks calls. | |
1268 | */ | |
c2536668 | 1269 | if (direct || size > (1 << inode->i_blkbits)) { |
2b8f12b7 CH |
1270 | xfs_off_t mapping_size; |
1271 | ||
1272 | mapping_size = imap.br_startoff + imap.br_blockcount - iblock; | |
1273 | mapping_size <<= inode->i_blkbits; | |
1274 | ||
1275 | ASSERT(mapping_size > 0); | |
1276 | if (mapping_size > size) | |
1277 | mapping_size = size; | |
1278 | if (mapping_size > LONG_MAX) | |
1279 | mapping_size = LONG_MAX; | |
1280 | ||
1281 | bh_result->b_size = mapping_size; | |
1da177e4 LT |
1282 | } |
1283 | ||
1284 | return 0; | |
a206c817 CH |
1285 | |
1286 | out_unlock: | |
1287 | xfs_iunlock(ip, lockmode); | |
1288 | return -error; | |
1da177e4 LT |
1289 | } |
1290 | ||
1291 | int | |
c2536668 | 1292 | xfs_get_blocks( |
1da177e4 LT |
1293 | struct inode *inode, |
1294 | sector_t iblock, | |
1295 | struct buffer_head *bh_result, | |
1296 | int create) | |
1297 | { | |
f2bde9b8 | 1298 | return __xfs_get_blocks(inode, iblock, bh_result, create, 0); |
1da177e4 LT |
1299 | } |
1300 | ||
1301 | STATIC int | |
e4c573bb | 1302 | xfs_get_blocks_direct( |
1da177e4 LT |
1303 | struct inode *inode, |
1304 | sector_t iblock, | |
1da177e4 LT |
1305 | struct buffer_head *bh_result, |
1306 | int create) | |
1307 | { | |
f2bde9b8 | 1308 | return __xfs_get_blocks(inode, iblock, bh_result, create, 1); |
1da177e4 LT |
1309 | } |
1310 | ||
209fb87a CH |
1311 | /* |
1312 | * Complete a direct I/O write request. | |
1313 | * | |
1314 | * If the private argument is non-NULL __xfs_get_blocks signals us that we | |
1315 | * need to issue a transaction to convert the range from unwritten to written | |
1316 | * extents. In case this is regular synchronous I/O we just call xfs_end_io | |
25985edc | 1317 | * to do this and we are done. But in case this was a successful AIO |
209fb87a CH |
1318 | * request this handler is called from interrupt context, from which we |
1319 | * can't start transactions. In that case offload the I/O completion to | |
1320 | * the workqueues we also use for buffered I/O completion. | |
1321 | */ | |
f0973863 | 1322 | STATIC void |
209fb87a CH |
1323 | xfs_end_io_direct_write( |
1324 | struct kiocb *iocb, | |
1325 | loff_t offset, | |
1326 | ssize_t size, | |
1327 | void *private, | |
1328 | int ret, | |
1329 | bool is_async) | |
f0973863 | 1330 | { |
209fb87a | 1331 | struct xfs_ioend *ioend = iocb->private; |
f0973863 | 1332 | |
2813d682 CH |
1333 | /* |
1334 | * While the generic direct I/O code updates the inode size, it does | |
1335 | * so only after the end_io handler is called, which means our | |
1336 | * end_io handler thinks the on-disk size is outside the in-core | |
1337 | * size. To prevent this just update it a little bit earlier here. | |
1338 | */ | |
1339 | if (offset + size > i_size_read(ioend->io_inode)) | |
1340 | i_size_write(ioend->io_inode, offset + size); | |
1341 | ||
f0973863 | 1342 | /* |
209fb87a CH |
1343 | * blockdev_direct_IO can return an error even after the I/O |
1344 | * completion handler was called. Thus we need to protect | |
1345 | * against double-freeing. | |
f0973863 | 1346 | */ |
209fb87a CH |
1347 | iocb->private = NULL; |
1348 | ||
ba87ea69 LM |
1349 | ioend->io_offset = offset; |
1350 | ioend->io_size = size; | |
c859cdd1 CH |
1351 | ioend->io_iocb = iocb; |
1352 | ioend->io_result = ret; | |
209fb87a CH |
1353 | if (private && size > 0) |
1354 | ioend->io_type = IO_UNWRITTEN; | |
1355 | ||
1356 | if (is_async) { | |
c859cdd1 | 1357 | ioend->io_isasync = 1; |
209fb87a | 1358 | xfs_finish_ioend(ioend); |
f0973863 | 1359 | } else { |
209fb87a | 1360 | xfs_finish_ioend_sync(ioend); |
f0973863 | 1361 | } |
f0973863 CH |
1362 | } |
1363 | ||
1da177e4 | 1364 | STATIC ssize_t |
e4c573bb | 1365 | xfs_vm_direct_IO( |
1da177e4 LT |
1366 | int rw, |
1367 | struct kiocb *iocb, | |
1368 | const struct iovec *iov, | |
1369 | loff_t offset, | |
1370 | unsigned long nr_segs) | |
1371 | { | |
209fb87a CH |
1372 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
1373 | struct block_device *bdev = xfs_find_bdev_for_inode(inode); | |
281627df | 1374 | struct xfs_ioend *ioend = NULL; |
209fb87a CH |
1375 | ssize_t ret; |
1376 | ||
1377 | if (rw & WRITE) { | |
281627df CH |
1378 | size_t size = iov_length(iov, nr_segs); |
1379 | ||
1380 | /* | |
1381 | * We need to preallocate a transaction for a size update | |
1382 | * here. In the case that this write both updates the size | |
1383 | * and converts at least on unwritten extent we will cancel | |
1384 | * the still clean transaction after the I/O has finished. | |
1385 | */ | |
1386 | iocb->private = ioend = xfs_alloc_ioend(inode, IO_DIRECT); | |
1387 | if (offset + size > XFS_I(inode)->i_d.di_size) { | |
1388 | ret = xfs_setfilesize_trans_alloc(ioend); | |
1389 | if (ret) | |
1390 | goto out_destroy_ioend; | |
1391 | ioend->io_isdirect = 1; | |
1392 | } | |
209fb87a | 1393 | |
eafdc7d1 CH |
1394 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
1395 | offset, nr_segs, | |
1396 | xfs_get_blocks_direct, | |
1397 | xfs_end_io_direct_write, NULL, 0); | |
209fb87a | 1398 | if (ret != -EIOCBQUEUED && iocb->private) |
281627df | 1399 | goto out_trans_cancel; |
209fb87a | 1400 | } else { |
eafdc7d1 CH |
1401 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
1402 | offset, nr_segs, | |
1403 | xfs_get_blocks_direct, | |
1404 | NULL, NULL, 0); | |
209fb87a | 1405 | } |
f0973863 | 1406 | |
f0973863 | 1407 | return ret; |
281627df CH |
1408 | |
1409 | out_trans_cancel: | |
1410 | if (ioend->io_append_trans) { | |
1411 | current_set_flags_nested(&ioend->io_append_trans->t_pflags, | |
1412 | PF_FSTRANS); | |
1413 | xfs_trans_cancel(ioend->io_append_trans, 0); | |
1414 | } | |
1415 | out_destroy_ioend: | |
1416 | xfs_destroy_ioend(ioend); | |
1417 | return ret; | |
1da177e4 LT |
1418 | } |
1419 | ||
d3bc815a DC |
1420 | /* |
1421 | * Punch out the delalloc blocks we have already allocated. | |
1422 | * | |
1423 | * Don't bother with xfs_setattr given that nothing can have made it to disk yet | |
1424 | * as the page is still locked at this point. | |
1425 | */ | |
1426 | STATIC void | |
1427 | xfs_vm_kill_delalloc_range( | |
1428 | struct inode *inode, | |
1429 | loff_t start, | |
1430 | loff_t end) | |
1431 | { | |
1432 | struct xfs_inode *ip = XFS_I(inode); | |
1433 | xfs_fileoff_t start_fsb; | |
1434 | xfs_fileoff_t end_fsb; | |
1435 | int error; | |
1436 | ||
1437 | start_fsb = XFS_B_TO_FSB(ip->i_mount, start); | |
1438 | end_fsb = XFS_B_TO_FSB(ip->i_mount, end); | |
1439 | if (end_fsb <= start_fsb) | |
1440 | return; | |
1441 | ||
1442 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1443 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, | |
1444 | end_fsb - start_fsb); | |
1445 | if (error) { | |
1446 | /* something screwed, just bail */ | |
1447 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
1448 | xfs_alert(ip->i_mount, | |
1449 | "xfs_vm_write_failed: unable to clean up ino %lld", | |
1450 | ip->i_ino); | |
1451 | } | |
1452 | } | |
1453 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1454 | } | |
1455 | ||
fa9b227e CH |
1456 | STATIC void |
1457 | xfs_vm_write_failed( | |
d3bc815a DC |
1458 | struct inode *inode, |
1459 | struct page *page, | |
1460 | loff_t pos, | |
1461 | unsigned len) | |
fa9b227e | 1462 | { |
d3bc815a DC |
1463 | loff_t block_offset = pos & PAGE_MASK; |
1464 | loff_t block_start; | |
1465 | loff_t block_end; | |
1466 | loff_t from = pos & (PAGE_CACHE_SIZE - 1); | |
1467 | loff_t to = from + len; | |
1468 | struct buffer_head *bh, *head; | |
fa9b227e | 1469 | |
d3bc815a | 1470 | ASSERT(block_offset + from == pos); |
c726de44 | 1471 | |
d3bc815a DC |
1472 | head = page_buffers(page); |
1473 | block_start = 0; | |
1474 | for (bh = head; bh != head || !block_start; | |
1475 | bh = bh->b_this_page, block_start = block_end, | |
1476 | block_offset += bh->b_size) { | |
1477 | block_end = block_start + bh->b_size; | |
c726de44 | 1478 | |
d3bc815a DC |
1479 | /* skip buffers before the write */ |
1480 | if (block_end <= from) | |
1481 | continue; | |
1482 | ||
1483 | /* if the buffer is after the write, we're done */ | |
1484 | if (block_start >= to) | |
1485 | break; | |
1486 | ||
1487 | if (!buffer_delay(bh)) | |
1488 | continue; | |
1489 | ||
1490 | if (!buffer_new(bh) && block_offset < i_size_read(inode)) | |
1491 | continue; | |
1492 | ||
1493 | xfs_vm_kill_delalloc_range(inode, block_offset, | |
1494 | block_offset + bh->b_size); | |
fa9b227e | 1495 | } |
d3bc815a | 1496 | |
fa9b227e CH |
1497 | } |
1498 | ||
d3bc815a DC |
1499 | /* |
1500 | * This used to call block_write_begin(), but it unlocks and releases the page | |
1501 | * on error, and we need that page to be able to punch stale delalloc blocks out | |
1502 | * on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at | |
1503 | * the appropriate point. | |
1504 | */ | |
f51623b2 | 1505 | STATIC int |
d79689c7 | 1506 | xfs_vm_write_begin( |
f51623b2 | 1507 | struct file *file, |
d79689c7 NP |
1508 | struct address_space *mapping, |
1509 | loff_t pos, | |
1510 | unsigned len, | |
1511 | unsigned flags, | |
1512 | struct page **pagep, | |
1513 | void **fsdata) | |
f51623b2 | 1514 | { |
d3bc815a DC |
1515 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
1516 | struct page *page; | |
1517 | int status; | |
155130a4 | 1518 | |
d3bc815a DC |
1519 | ASSERT(len <= PAGE_CACHE_SIZE); |
1520 | ||
1521 | page = grab_cache_page_write_begin(mapping, index, | |
1522 | flags | AOP_FLAG_NOFS); | |
1523 | if (!page) | |
1524 | return -ENOMEM; | |
1525 | ||
1526 | status = __block_write_begin(page, pos, len, xfs_get_blocks); | |
1527 | if (unlikely(status)) { | |
1528 | struct inode *inode = mapping->host; | |
1529 | ||
1530 | xfs_vm_write_failed(inode, page, pos, len); | |
1531 | unlock_page(page); | |
1532 | ||
1533 | if (pos + len > i_size_read(inode)) | |
1534 | truncate_pagecache(inode, pos + len, i_size_read(inode)); | |
1535 | ||
1536 | page_cache_release(page); | |
1537 | page = NULL; | |
1538 | } | |
1539 | ||
1540 | *pagep = page; | |
1541 | return status; | |
fa9b227e CH |
1542 | } |
1543 | ||
d3bc815a DC |
1544 | /* |
1545 | * On failure, we only need to kill delalloc blocks beyond EOF because they | |
1546 | * will never be written. For blocks within EOF, generic_write_end() zeros them | |
1547 | * so they are safe to leave alone and be written with all the other valid data. | |
1548 | */ | |
fa9b227e CH |
1549 | STATIC int |
1550 | xfs_vm_write_end( | |
1551 | struct file *file, | |
1552 | struct address_space *mapping, | |
1553 | loff_t pos, | |
1554 | unsigned len, | |
1555 | unsigned copied, | |
1556 | struct page *page, | |
1557 | void *fsdata) | |
1558 | { | |
1559 | int ret; | |
155130a4 | 1560 | |
d3bc815a DC |
1561 | ASSERT(len <= PAGE_CACHE_SIZE); |
1562 | ||
fa9b227e | 1563 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
d3bc815a DC |
1564 | if (unlikely(ret < len)) { |
1565 | struct inode *inode = mapping->host; | |
1566 | size_t isize = i_size_read(inode); | |
1567 | loff_t to = pos + len; | |
1568 | ||
1569 | if (to > isize) { | |
1570 | truncate_pagecache(inode, to, isize); | |
1571 | xfs_vm_kill_delalloc_range(inode, isize, to); | |
1572 | } | |
1573 | } | |
155130a4 | 1574 | return ret; |
f51623b2 | 1575 | } |
1da177e4 LT |
1576 | |
1577 | STATIC sector_t | |
e4c573bb | 1578 | xfs_vm_bmap( |
1da177e4 LT |
1579 | struct address_space *mapping, |
1580 | sector_t block) | |
1581 | { | |
1582 | struct inode *inode = (struct inode *)mapping->host; | |
739bfb2a | 1583 | struct xfs_inode *ip = XFS_I(inode); |
1da177e4 | 1584 | |
cca28fb8 | 1585 | trace_xfs_vm_bmap(XFS_I(inode)); |
126468b1 | 1586 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
739bfb2a | 1587 | xfs_flush_pages(ip, (xfs_off_t)0, -1, 0, FI_REMAPF); |
126468b1 | 1588 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
c2536668 | 1589 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
1da177e4 LT |
1590 | } |
1591 | ||
1592 | STATIC int | |
e4c573bb | 1593 | xfs_vm_readpage( |
1da177e4 LT |
1594 | struct file *unused, |
1595 | struct page *page) | |
1596 | { | |
c2536668 | 1597 | return mpage_readpage(page, xfs_get_blocks); |
1da177e4 LT |
1598 | } |
1599 | ||
1600 | STATIC int | |
e4c573bb | 1601 | xfs_vm_readpages( |
1da177e4 LT |
1602 | struct file *unused, |
1603 | struct address_space *mapping, | |
1604 | struct list_head *pages, | |
1605 | unsigned nr_pages) | |
1606 | { | |
c2536668 | 1607 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
1da177e4 LT |
1608 | } |
1609 | ||
f5e54d6e | 1610 | const struct address_space_operations xfs_address_space_operations = { |
e4c573bb NS |
1611 | .readpage = xfs_vm_readpage, |
1612 | .readpages = xfs_vm_readpages, | |
1613 | .writepage = xfs_vm_writepage, | |
7d4fb40a | 1614 | .writepages = xfs_vm_writepages, |
238f4c54 NS |
1615 | .releasepage = xfs_vm_releasepage, |
1616 | .invalidatepage = xfs_vm_invalidatepage, | |
d79689c7 | 1617 | .write_begin = xfs_vm_write_begin, |
fa9b227e | 1618 | .write_end = xfs_vm_write_end, |
e4c573bb NS |
1619 | .bmap = xfs_vm_bmap, |
1620 | .direct_IO = xfs_vm_direct_IO, | |
e965f963 | 1621 | .migratepage = buffer_migrate_page, |
bddaafa1 | 1622 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1623 | .error_remove_page = generic_error_remove_page, |
1da177e4 | 1624 | }; |