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" |
a844f451 | 19 | #include "xfs_bit.h" |
1da177e4 | 20 | #include "xfs_log.h" |
a844f451 | 21 | #include "xfs_inum.h" |
1da177e4 | 22 | #include "xfs_sb.h" |
a844f451 | 23 | #include "xfs_ag.h" |
1da177e4 LT |
24 | #include "xfs_dir2.h" |
25 | #include "xfs_trans.h" | |
26 | #include "xfs_dmapi.h" | |
27 | #include "xfs_mount.h" | |
28 | #include "xfs_bmap_btree.h" | |
29 | #include "xfs_alloc_btree.h" | |
30 | #include "xfs_ialloc_btree.h" | |
1da177e4 | 31 | #include "xfs_dir2_sf.h" |
a844f451 | 32 | #include "xfs_attr_sf.h" |
1da177e4 LT |
33 | #include "xfs_dinode.h" |
34 | #include "xfs_inode.h" | |
a844f451 NS |
35 | #include "xfs_alloc.h" |
36 | #include "xfs_btree.h" | |
1da177e4 LT |
37 | #include "xfs_error.h" |
38 | #include "xfs_rw.h" | |
39 | #include "xfs_iomap.h" | |
40 | #include <linux/mpage.h> | |
10ce4444 | 41 | #include <linux/pagevec.h> |
1da177e4 LT |
42 | #include <linux/writeback.h> |
43 | ||
f51623b2 NS |
44 | STATIC void |
45 | xfs_count_page_state( | |
46 | struct page *page, | |
47 | int *delalloc, | |
48 | int *unmapped, | |
49 | int *unwritten) | |
50 | { | |
51 | struct buffer_head *bh, *head; | |
52 | ||
53 | *delalloc = *unmapped = *unwritten = 0; | |
54 | ||
55 | bh = head = page_buffers(page); | |
56 | do { | |
57 | if (buffer_uptodate(bh) && !buffer_mapped(bh)) | |
58 | (*unmapped) = 1; | |
f51623b2 NS |
59 | else if (buffer_unwritten(bh)) |
60 | (*unwritten) = 1; | |
61 | else if (buffer_delay(bh)) | |
62 | (*delalloc) = 1; | |
63 | } while ((bh = bh->b_this_page) != head); | |
64 | } | |
65 | ||
1da177e4 LT |
66 | #if defined(XFS_RW_TRACE) |
67 | void | |
68 | xfs_page_trace( | |
69 | int tag, | |
70 | struct inode *inode, | |
71 | struct page *page, | |
ed9d88f7 | 72 | unsigned long pgoff) |
1da177e4 LT |
73 | { |
74 | xfs_inode_t *ip; | |
67fcaa73 | 75 | bhv_vnode_t *vp = vn_from_inode(inode); |
1da177e4 | 76 | loff_t isize = i_size_read(inode); |
f6d6d4fc | 77 | loff_t offset = page_offset(page); |
1da177e4 LT |
78 | int delalloc = -1, unmapped = -1, unwritten = -1; |
79 | ||
80 | if (page_has_buffers(page)) | |
81 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); | |
82 | ||
75e17b3c | 83 | ip = xfs_vtoi(vp); |
1da177e4 LT |
84 | if (!ip->i_rwtrace) |
85 | return; | |
86 | ||
87 | ktrace_enter(ip->i_rwtrace, | |
88 | (void *)((unsigned long)tag), | |
89 | (void *)ip, | |
90 | (void *)inode, | |
91 | (void *)page, | |
ed9d88f7 | 92 | (void *)pgoff, |
1da177e4 LT |
93 | (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), |
94 | (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), | |
95 | (void *)((unsigned long)((isize >> 32) & 0xffffffff)), | |
96 | (void *)((unsigned long)(isize & 0xffffffff)), | |
97 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
98 | (void *)((unsigned long)(offset & 0xffffffff)), | |
99 | (void *)((unsigned long)delalloc), | |
100 | (void *)((unsigned long)unmapped), | |
101 | (void *)((unsigned long)unwritten), | |
f1fdc848 | 102 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
103 | (void *)NULL); |
104 | } | |
105 | #else | |
ed9d88f7 | 106 | #define xfs_page_trace(tag, inode, page, pgoff) |
1da177e4 LT |
107 | #endif |
108 | ||
0829c360 CH |
109 | /* |
110 | * Schedule IO completion handling on a xfsdatad if this was | |
e927af90 DC |
111 | * the final hold on this ioend. If we are asked to wait, |
112 | * flush the workqueue. | |
0829c360 CH |
113 | */ |
114 | STATIC void | |
115 | xfs_finish_ioend( | |
e927af90 DC |
116 | xfs_ioend_t *ioend, |
117 | int wait) | |
0829c360 | 118 | { |
e927af90 | 119 | if (atomic_dec_and_test(&ioend->io_remaining)) { |
0829c360 | 120 | queue_work(xfsdatad_workqueue, &ioend->io_work); |
e927af90 DC |
121 | if (wait) |
122 | flush_workqueue(xfsdatad_workqueue); | |
123 | } | |
0829c360 CH |
124 | } |
125 | ||
f6d6d4fc CH |
126 | /* |
127 | * We're now finished for good with this ioend structure. | |
128 | * Update the page state via the associated buffer_heads, | |
129 | * release holds on the inode and bio, and finally free | |
130 | * up memory. Do not use the ioend after this. | |
131 | */ | |
0829c360 CH |
132 | STATIC void |
133 | xfs_destroy_ioend( | |
134 | xfs_ioend_t *ioend) | |
135 | { | |
f6d6d4fc CH |
136 | struct buffer_head *bh, *next; |
137 | ||
138 | for (bh = ioend->io_buffer_head; bh; bh = next) { | |
139 | next = bh->b_private; | |
7d04a335 | 140 | bh->b_end_io(bh, !ioend->io_error); |
f6d6d4fc | 141 | } |
7d04a335 NS |
142 | if (unlikely(ioend->io_error)) |
143 | vn_ioerror(ioend->io_vnode, ioend->io_error, __FILE__,__LINE__); | |
0829c360 CH |
144 | vn_iowake(ioend->io_vnode); |
145 | mempool_free(ioend, xfs_ioend_pool); | |
146 | } | |
147 | ||
ba87ea69 LM |
148 | /* |
149 | * Update on-disk file size now that data has been written to disk. | |
150 | * The current in-memory file size is i_size. If a write is beyond | |
151 | * eof io_new_size will be the intended file size until i_size is | |
152 | * updated. If this write does not extend all the way to the valid | |
153 | * file size then restrict this update to the end of the write. | |
154 | */ | |
155 | STATIC void | |
156 | xfs_setfilesize( | |
157 | xfs_ioend_t *ioend) | |
158 | { | |
159 | xfs_inode_t *ip; | |
160 | xfs_fsize_t isize; | |
161 | xfs_fsize_t bsize; | |
162 | ||
163 | ip = xfs_vtoi(ioend->io_vnode); | |
164 | ||
165 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG); | |
166 | ASSERT(ioend->io_type != IOMAP_READ); | |
167 | ||
168 | if (unlikely(ioend->io_error)) | |
169 | return; | |
170 | ||
171 | bsize = ioend->io_offset + ioend->io_size; | |
172 | ||
173 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
174 | ||
175 | isize = MAX(ip->i_size, ip->i_iocore.io_new_size); | |
176 | isize = MIN(isize, bsize); | |
177 | ||
178 | if (ip->i_d.di_size < isize) { | |
179 | ip->i_d.di_size = isize; | |
180 | ip->i_update_core = 1; | |
181 | ip->i_update_size = 1; | |
182 | } | |
183 | ||
184 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
185 | } | |
186 | ||
0829c360 | 187 | /* |
f6d6d4fc | 188 | * Buffered IO write completion for delayed allocate extents. |
f6d6d4fc CH |
189 | */ |
190 | STATIC void | |
191 | xfs_end_bio_delalloc( | |
c4028958 | 192 | struct work_struct *work) |
f6d6d4fc | 193 | { |
c4028958 DH |
194 | xfs_ioend_t *ioend = |
195 | container_of(work, xfs_ioend_t, io_work); | |
f6d6d4fc | 196 | |
ba87ea69 | 197 | xfs_setfilesize(ioend); |
f6d6d4fc CH |
198 | xfs_destroy_ioend(ioend); |
199 | } | |
200 | ||
201 | /* | |
202 | * Buffered IO write completion for regular, written extents. | |
203 | */ | |
204 | STATIC void | |
205 | xfs_end_bio_written( | |
c4028958 | 206 | struct work_struct *work) |
f6d6d4fc | 207 | { |
c4028958 DH |
208 | xfs_ioend_t *ioend = |
209 | container_of(work, xfs_ioend_t, io_work); | |
f6d6d4fc | 210 | |
ba87ea69 | 211 | xfs_setfilesize(ioend); |
f6d6d4fc CH |
212 | xfs_destroy_ioend(ioend); |
213 | } | |
214 | ||
215 | /* | |
216 | * IO write completion for unwritten extents. | |
217 | * | |
0829c360 | 218 | * Issue transactions to convert a buffer range from unwritten |
f0973863 | 219 | * to written extents. |
0829c360 CH |
220 | */ |
221 | STATIC void | |
222 | xfs_end_bio_unwritten( | |
c4028958 | 223 | struct work_struct *work) |
0829c360 | 224 | { |
c4028958 DH |
225 | xfs_ioend_t *ioend = |
226 | container_of(work, xfs_ioend_t, io_work); | |
67fcaa73 | 227 | bhv_vnode_t *vp = ioend->io_vnode; |
0829c360 CH |
228 | xfs_off_t offset = ioend->io_offset; |
229 | size_t size = ioend->io_size; | |
0829c360 | 230 | |
ba87ea69 | 231 | if (likely(!ioend->io_error)) { |
67fcaa73 | 232 | bhv_vop_bmap(vp, offset, size, BMAPI_UNWRITTEN, NULL, NULL); |
ba87ea69 LM |
233 | xfs_setfilesize(ioend); |
234 | } | |
235 | xfs_destroy_ioend(ioend); | |
236 | } | |
237 | ||
238 | /* | |
239 | * IO read completion for regular, written extents. | |
240 | */ | |
241 | STATIC void | |
242 | xfs_end_bio_read( | |
243 | struct work_struct *work) | |
244 | { | |
245 | xfs_ioend_t *ioend = | |
246 | container_of(work, xfs_ioend_t, io_work); | |
247 | ||
0829c360 CH |
248 | xfs_destroy_ioend(ioend); |
249 | } | |
250 | ||
251 | /* | |
252 | * Allocate and initialise an IO completion structure. | |
253 | * We need to track unwritten extent write completion here initially. | |
254 | * We'll need to extend this for updating the ondisk inode size later | |
255 | * (vs. incore size). | |
256 | */ | |
257 | STATIC xfs_ioend_t * | |
258 | xfs_alloc_ioend( | |
f6d6d4fc CH |
259 | struct inode *inode, |
260 | unsigned int type) | |
0829c360 CH |
261 | { |
262 | xfs_ioend_t *ioend; | |
263 | ||
264 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); | |
265 | ||
266 | /* | |
267 | * Set the count to 1 initially, which will prevent an I/O | |
268 | * completion callback from happening before we have started | |
269 | * all the I/O from calling the completion routine too early. | |
270 | */ | |
271 | atomic_set(&ioend->io_remaining, 1); | |
7d04a335 | 272 | ioend->io_error = 0; |
f6d6d4fc CH |
273 | ioend->io_list = NULL; |
274 | ioend->io_type = type; | |
ec86dc02 | 275 | ioend->io_vnode = vn_from_inode(inode); |
c1a073bd | 276 | ioend->io_buffer_head = NULL; |
f6d6d4fc | 277 | ioend->io_buffer_tail = NULL; |
0829c360 CH |
278 | atomic_inc(&ioend->io_vnode->v_iocount); |
279 | ioend->io_offset = 0; | |
280 | ioend->io_size = 0; | |
281 | ||
f6d6d4fc | 282 | if (type == IOMAP_UNWRITTEN) |
c4028958 | 283 | INIT_WORK(&ioend->io_work, xfs_end_bio_unwritten); |
f6d6d4fc | 284 | else if (type == IOMAP_DELAY) |
c4028958 | 285 | INIT_WORK(&ioend->io_work, xfs_end_bio_delalloc); |
ba87ea69 LM |
286 | else if (type == IOMAP_READ) |
287 | INIT_WORK(&ioend->io_work, xfs_end_bio_read); | |
f6d6d4fc | 288 | else |
c4028958 | 289 | INIT_WORK(&ioend->io_work, xfs_end_bio_written); |
0829c360 CH |
290 | |
291 | return ioend; | |
292 | } | |
293 | ||
1da177e4 LT |
294 | STATIC int |
295 | xfs_map_blocks( | |
296 | struct inode *inode, | |
297 | loff_t offset, | |
298 | ssize_t count, | |
299 | xfs_iomap_t *mapp, | |
300 | int flags) | |
301 | { | |
67fcaa73 | 302 | bhv_vnode_t *vp = vn_from_inode(inode); |
1da177e4 LT |
303 | int error, nmaps = 1; |
304 | ||
67fcaa73 | 305 | error = bhv_vop_bmap(vp, offset, count, flags, mapp, &nmaps); |
1da177e4 LT |
306 | if (!error && (flags & (BMAPI_WRITE|BMAPI_ALLOCATE))) |
307 | VMODIFY(vp); | |
308 | return -error; | |
309 | } | |
310 | ||
7989cb8e | 311 | STATIC_INLINE int |
1defeac9 | 312 | xfs_iomap_valid( |
1da177e4 | 313 | xfs_iomap_t *iomapp, |
1defeac9 | 314 | loff_t offset) |
1da177e4 | 315 | { |
1defeac9 CH |
316 | return offset >= iomapp->iomap_offset && |
317 | offset < iomapp->iomap_offset + iomapp->iomap_bsize; | |
1da177e4 LT |
318 | } |
319 | ||
f6d6d4fc CH |
320 | /* |
321 | * BIO completion handler for buffered IO. | |
322 | */ | |
323 | STATIC int | |
324 | xfs_end_bio( | |
325 | struct bio *bio, | |
326 | unsigned int bytes_done, | |
327 | int error) | |
328 | { | |
329 | xfs_ioend_t *ioend = bio->bi_private; | |
330 | ||
331 | if (bio->bi_size) | |
332 | return 1; | |
333 | ||
f6d6d4fc | 334 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
7d04a335 | 335 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
f6d6d4fc CH |
336 | |
337 | /* Toss bio and pass work off to an xfsdatad thread */ | |
f6d6d4fc CH |
338 | bio->bi_private = NULL; |
339 | bio->bi_end_io = NULL; | |
f6d6d4fc | 340 | bio_put(bio); |
7d04a335 | 341 | |
e927af90 | 342 | xfs_finish_ioend(ioend, 0); |
f6d6d4fc CH |
343 | return 0; |
344 | } | |
345 | ||
346 | STATIC void | |
347 | xfs_submit_ioend_bio( | |
348 | xfs_ioend_t *ioend, | |
349 | struct bio *bio) | |
350 | { | |
351 | atomic_inc(&ioend->io_remaining); | |
352 | ||
353 | bio->bi_private = ioend; | |
354 | bio->bi_end_io = xfs_end_bio; | |
355 | ||
356 | submit_bio(WRITE, bio); | |
357 | ASSERT(!bio_flagged(bio, BIO_EOPNOTSUPP)); | |
358 | bio_put(bio); | |
359 | } | |
360 | ||
361 | STATIC struct bio * | |
362 | xfs_alloc_ioend_bio( | |
363 | struct buffer_head *bh) | |
364 | { | |
365 | struct bio *bio; | |
366 | int nvecs = bio_get_nr_vecs(bh->b_bdev); | |
367 | ||
368 | do { | |
369 | bio = bio_alloc(GFP_NOIO, nvecs); | |
370 | nvecs >>= 1; | |
371 | } while (!bio); | |
372 | ||
373 | ASSERT(bio->bi_private == NULL); | |
374 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); | |
375 | bio->bi_bdev = bh->b_bdev; | |
376 | bio_get(bio); | |
377 | return bio; | |
378 | } | |
379 | ||
380 | STATIC void | |
381 | xfs_start_buffer_writeback( | |
382 | struct buffer_head *bh) | |
383 | { | |
384 | ASSERT(buffer_mapped(bh)); | |
385 | ASSERT(buffer_locked(bh)); | |
386 | ASSERT(!buffer_delay(bh)); | |
387 | ASSERT(!buffer_unwritten(bh)); | |
388 | ||
389 | mark_buffer_async_write(bh); | |
390 | set_buffer_uptodate(bh); | |
391 | clear_buffer_dirty(bh); | |
392 | } | |
393 | ||
394 | STATIC void | |
395 | xfs_start_page_writeback( | |
396 | struct page *page, | |
397 | struct writeback_control *wbc, | |
398 | int clear_dirty, | |
399 | int buffers) | |
400 | { | |
401 | ASSERT(PageLocked(page)); | |
402 | ASSERT(!PageWriteback(page)); | |
f6d6d4fc | 403 | if (clear_dirty) |
92132021 DC |
404 | clear_page_dirty_for_io(page); |
405 | set_page_writeback(page); | |
f6d6d4fc CH |
406 | unlock_page(page); |
407 | if (!buffers) { | |
408 | end_page_writeback(page); | |
409 | wbc->pages_skipped++; /* We didn't write this page */ | |
410 | } | |
411 | } | |
412 | ||
413 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) | |
414 | { | |
415 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
416 | } | |
417 | ||
418 | /* | |
d88992f6 DC |
419 | * Submit all of the bios for all of the ioends we have saved up, covering the |
420 | * initial writepage page and also any probed pages. | |
421 | * | |
422 | * Because we may have multiple ioends spanning a page, we need to start | |
423 | * writeback on all the buffers before we submit them for I/O. If we mark the | |
424 | * buffers as we got, then we can end up with a page that only has buffers | |
425 | * marked async write and I/O complete on can occur before we mark the other | |
426 | * buffers async write. | |
427 | * | |
428 | * The end result of this is that we trip a bug in end_page_writeback() because | |
429 | * we call it twice for the one page as the code in end_buffer_async_write() | |
430 | * assumes that all buffers on the page are started at the same time. | |
431 | * | |
432 | * The fix is two passes across the ioend list - one to start writeback on the | |
c41564b5 | 433 | * buffer_heads, and then submit them for I/O on the second pass. |
f6d6d4fc CH |
434 | */ |
435 | STATIC void | |
436 | xfs_submit_ioend( | |
437 | xfs_ioend_t *ioend) | |
438 | { | |
d88992f6 | 439 | xfs_ioend_t *head = ioend; |
f6d6d4fc CH |
440 | xfs_ioend_t *next; |
441 | struct buffer_head *bh; | |
442 | struct bio *bio; | |
443 | sector_t lastblock = 0; | |
444 | ||
d88992f6 DC |
445 | /* Pass 1 - start writeback */ |
446 | do { | |
447 | next = ioend->io_list; | |
448 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { | |
449 | xfs_start_buffer_writeback(bh); | |
450 | } | |
451 | } while ((ioend = next) != NULL); | |
452 | ||
453 | /* Pass 2 - submit I/O */ | |
454 | ioend = head; | |
f6d6d4fc CH |
455 | do { |
456 | next = ioend->io_list; | |
457 | bio = NULL; | |
458 | ||
459 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { | |
f6d6d4fc CH |
460 | |
461 | if (!bio) { | |
462 | retry: | |
463 | bio = xfs_alloc_ioend_bio(bh); | |
464 | } else if (bh->b_blocknr != lastblock + 1) { | |
465 | xfs_submit_ioend_bio(ioend, bio); | |
466 | goto retry; | |
467 | } | |
468 | ||
469 | if (bio_add_buffer(bio, bh) != bh->b_size) { | |
470 | xfs_submit_ioend_bio(ioend, bio); | |
471 | goto retry; | |
472 | } | |
473 | ||
474 | lastblock = bh->b_blocknr; | |
475 | } | |
476 | if (bio) | |
477 | xfs_submit_ioend_bio(ioend, bio); | |
e927af90 | 478 | xfs_finish_ioend(ioend, 0); |
f6d6d4fc CH |
479 | } while ((ioend = next) != NULL); |
480 | } | |
481 | ||
482 | /* | |
483 | * Cancel submission of all buffer_heads so far in this endio. | |
484 | * Toss the endio too. Only ever called for the initial page | |
485 | * in a writepage request, so only ever one page. | |
486 | */ | |
487 | STATIC void | |
488 | xfs_cancel_ioend( | |
489 | xfs_ioend_t *ioend) | |
490 | { | |
491 | xfs_ioend_t *next; | |
492 | struct buffer_head *bh, *next_bh; | |
493 | ||
494 | do { | |
495 | next = ioend->io_list; | |
496 | bh = ioend->io_buffer_head; | |
497 | do { | |
498 | next_bh = bh->b_private; | |
499 | clear_buffer_async_write(bh); | |
500 | unlock_buffer(bh); | |
501 | } while ((bh = next_bh) != NULL); | |
502 | ||
503 | vn_iowake(ioend->io_vnode); | |
504 | mempool_free(ioend, xfs_ioend_pool); | |
505 | } while ((ioend = next) != NULL); | |
506 | } | |
507 | ||
508 | /* | |
509 | * Test to see if we've been building up a completion structure for | |
510 | * earlier buffers -- if so, we try to append to this ioend if we | |
511 | * can, otherwise we finish off any current ioend and start another. | |
512 | * Return true if we've finished the given ioend. | |
513 | */ | |
514 | STATIC void | |
515 | xfs_add_to_ioend( | |
516 | struct inode *inode, | |
517 | struct buffer_head *bh, | |
7336cea8 | 518 | xfs_off_t offset, |
f6d6d4fc CH |
519 | unsigned int type, |
520 | xfs_ioend_t **result, | |
521 | int need_ioend) | |
522 | { | |
523 | xfs_ioend_t *ioend = *result; | |
524 | ||
525 | if (!ioend || need_ioend || type != ioend->io_type) { | |
526 | xfs_ioend_t *previous = *result; | |
f6d6d4fc | 527 | |
f6d6d4fc CH |
528 | ioend = xfs_alloc_ioend(inode, type); |
529 | ioend->io_offset = offset; | |
530 | ioend->io_buffer_head = bh; | |
531 | ioend->io_buffer_tail = bh; | |
532 | if (previous) | |
533 | previous->io_list = ioend; | |
534 | *result = ioend; | |
535 | } else { | |
536 | ioend->io_buffer_tail->b_private = bh; | |
537 | ioend->io_buffer_tail = bh; | |
538 | } | |
539 | ||
540 | bh->b_private = NULL; | |
541 | ioend->io_size += bh->b_size; | |
542 | } | |
543 | ||
87cbc49c NS |
544 | STATIC void |
545 | xfs_map_buffer( | |
546 | struct buffer_head *bh, | |
547 | xfs_iomap_t *mp, | |
548 | xfs_off_t offset, | |
549 | uint block_bits) | |
550 | { | |
551 | sector_t bn; | |
552 | ||
553 | ASSERT(mp->iomap_bn != IOMAP_DADDR_NULL); | |
554 | ||
555 | bn = (mp->iomap_bn >> (block_bits - BBSHIFT)) + | |
556 | ((offset - mp->iomap_offset) >> block_bits); | |
557 | ||
558 | ASSERT(bn || (mp->iomap_flags & IOMAP_REALTIME)); | |
559 | ||
560 | bh->b_blocknr = bn; | |
561 | set_buffer_mapped(bh); | |
562 | } | |
563 | ||
1da177e4 LT |
564 | STATIC void |
565 | xfs_map_at_offset( | |
1da177e4 | 566 | struct buffer_head *bh, |
1defeac9 | 567 | loff_t offset, |
1da177e4 | 568 | int block_bits, |
1defeac9 | 569 | xfs_iomap_t *iomapp) |
1da177e4 | 570 | { |
1da177e4 LT |
571 | ASSERT(!(iomapp->iomap_flags & IOMAP_HOLE)); |
572 | ASSERT(!(iomapp->iomap_flags & IOMAP_DELAY)); | |
1da177e4 LT |
573 | |
574 | lock_buffer(bh); | |
87cbc49c | 575 | xfs_map_buffer(bh, iomapp, offset, block_bits); |
ce8e922c | 576 | bh->b_bdev = iomapp->iomap_target->bt_bdev; |
1da177e4 LT |
577 | set_buffer_mapped(bh); |
578 | clear_buffer_delay(bh); | |
f6d6d4fc | 579 | clear_buffer_unwritten(bh); |
1da177e4 LT |
580 | } |
581 | ||
582 | /* | |
6c4fe19f | 583 | * Look for a page at index that is suitable for clustering. |
1da177e4 LT |
584 | */ |
585 | STATIC unsigned int | |
6c4fe19f | 586 | xfs_probe_page( |
10ce4444 | 587 | struct page *page, |
6c4fe19f CH |
588 | unsigned int pg_offset, |
589 | int mapped) | |
1da177e4 | 590 | { |
1da177e4 LT |
591 | int ret = 0; |
592 | ||
1da177e4 | 593 | if (PageWriteback(page)) |
10ce4444 | 594 | return 0; |
1da177e4 LT |
595 | |
596 | if (page->mapping && PageDirty(page)) { | |
597 | if (page_has_buffers(page)) { | |
598 | struct buffer_head *bh, *head; | |
599 | ||
600 | bh = head = page_buffers(page); | |
601 | do { | |
6c4fe19f CH |
602 | if (!buffer_uptodate(bh)) |
603 | break; | |
604 | if (mapped != buffer_mapped(bh)) | |
1da177e4 LT |
605 | break; |
606 | ret += bh->b_size; | |
607 | if (ret >= pg_offset) | |
608 | break; | |
609 | } while ((bh = bh->b_this_page) != head); | |
610 | } else | |
6c4fe19f | 611 | ret = mapped ? 0 : PAGE_CACHE_SIZE; |
1da177e4 LT |
612 | } |
613 | ||
1da177e4 LT |
614 | return ret; |
615 | } | |
616 | ||
f6d6d4fc | 617 | STATIC size_t |
6c4fe19f | 618 | xfs_probe_cluster( |
1da177e4 LT |
619 | struct inode *inode, |
620 | struct page *startpage, | |
621 | struct buffer_head *bh, | |
6c4fe19f CH |
622 | struct buffer_head *head, |
623 | int mapped) | |
1da177e4 | 624 | { |
10ce4444 | 625 | struct pagevec pvec; |
1da177e4 | 626 | pgoff_t tindex, tlast, tloff; |
10ce4444 CH |
627 | size_t total = 0; |
628 | int done = 0, i; | |
1da177e4 LT |
629 | |
630 | /* First sum forwards in this page */ | |
631 | do { | |
2353e8e9 | 632 | if (!buffer_uptodate(bh) || (mapped != buffer_mapped(bh))) |
10ce4444 | 633 | return total; |
1da177e4 LT |
634 | total += bh->b_size; |
635 | } while ((bh = bh->b_this_page) != head); | |
636 | ||
10ce4444 CH |
637 | /* if we reached the end of the page, sum forwards in following pages */ |
638 | tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT; | |
639 | tindex = startpage->index + 1; | |
640 | ||
641 | /* Prune this back to avoid pathological behavior */ | |
642 | tloff = min(tlast, startpage->index + 64); | |
643 | ||
644 | pagevec_init(&pvec, 0); | |
645 | while (!done && tindex <= tloff) { | |
646 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
647 | ||
648 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
649 | break; | |
650 | ||
651 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
652 | struct page *page = pvec.pages[i]; | |
653 | size_t pg_offset, len = 0; | |
654 | ||
655 | if (tindex == tlast) { | |
656 | pg_offset = | |
657 | i_size_read(inode) & (PAGE_CACHE_SIZE - 1); | |
1defeac9 CH |
658 | if (!pg_offset) { |
659 | done = 1; | |
10ce4444 | 660 | break; |
1defeac9 | 661 | } |
10ce4444 CH |
662 | } else |
663 | pg_offset = PAGE_CACHE_SIZE; | |
664 | ||
665 | if (page->index == tindex && !TestSetPageLocked(page)) { | |
6c4fe19f | 666 | len = xfs_probe_page(page, pg_offset, mapped); |
10ce4444 CH |
667 | unlock_page(page); |
668 | } | |
669 | ||
670 | if (!len) { | |
671 | done = 1; | |
672 | break; | |
673 | } | |
674 | ||
1da177e4 | 675 | total += len; |
1defeac9 | 676 | tindex++; |
1da177e4 | 677 | } |
10ce4444 CH |
678 | |
679 | pagevec_release(&pvec); | |
680 | cond_resched(); | |
1da177e4 | 681 | } |
10ce4444 | 682 | |
1da177e4 LT |
683 | return total; |
684 | } | |
685 | ||
686 | /* | |
10ce4444 CH |
687 | * Test if a given page is suitable for writing as part of an unwritten |
688 | * or delayed allocate extent. | |
1da177e4 | 689 | */ |
10ce4444 CH |
690 | STATIC int |
691 | xfs_is_delayed_page( | |
692 | struct page *page, | |
f6d6d4fc | 693 | unsigned int type) |
1da177e4 | 694 | { |
1da177e4 | 695 | if (PageWriteback(page)) |
10ce4444 | 696 | return 0; |
1da177e4 LT |
697 | |
698 | if (page->mapping && page_has_buffers(page)) { | |
699 | struct buffer_head *bh, *head; | |
700 | int acceptable = 0; | |
701 | ||
702 | bh = head = page_buffers(page); | |
703 | do { | |
f6d6d4fc CH |
704 | if (buffer_unwritten(bh)) |
705 | acceptable = (type == IOMAP_UNWRITTEN); | |
706 | else if (buffer_delay(bh)) | |
707 | acceptable = (type == IOMAP_DELAY); | |
2ddee844 | 708 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
df3c7244 | 709 | acceptable = (type == IOMAP_NEW); |
f6d6d4fc | 710 | else |
1da177e4 | 711 | break; |
1da177e4 LT |
712 | } while ((bh = bh->b_this_page) != head); |
713 | ||
714 | if (acceptable) | |
10ce4444 | 715 | return 1; |
1da177e4 LT |
716 | } |
717 | ||
10ce4444 | 718 | return 0; |
1da177e4 LT |
719 | } |
720 | ||
1da177e4 LT |
721 | /* |
722 | * Allocate & map buffers for page given the extent map. Write it out. | |
723 | * except for the original page of a writepage, this is called on | |
724 | * delalloc/unwritten pages only, for the original page it is possible | |
725 | * that the page has no mapping at all. | |
726 | */ | |
f6d6d4fc | 727 | STATIC int |
1da177e4 LT |
728 | xfs_convert_page( |
729 | struct inode *inode, | |
730 | struct page *page, | |
10ce4444 | 731 | loff_t tindex, |
1defeac9 | 732 | xfs_iomap_t *mp, |
f6d6d4fc | 733 | xfs_ioend_t **ioendp, |
1da177e4 | 734 | struct writeback_control *wbc, |
1da177e4 LT |
735 | int startio, |
736 | int all_bh) | |
737 | { | |
f6d6d4fc | 738 | struct buffer_head *bh, *head; |
9260dc6b CH |
739 | xfs_off_t end_offset; |
740 | unsigned long p_offset; | |
f6d6d4fc | 741 | unsigned int type; |
1da177e4 | 742 | int bbits = inode->i_blkbits; |
24e17b5f | 743 | int len, page_dirty; |
f6d6d4fc | 744 | int count = 0, done = 0, uptodate = 1; |
9260dc6b | 745 | xfs_off_t offset = page_offset(page); |
1da177e4 | 746 | |
10ce4444 CH |
747 | if (page->index != tindex) |
748 | goto fail; | |
749 | if (TestSetPageLocked(page)) | |
750 | goto fail; | |
751 | if (PageWriteback(page)) | |
752 | goto fail_unlock_page; | |
753 | if (page->mapping != inode->i_mapping) | |
754 | goto fail_unlock_page; | |
755 | if (!xfs_is_delayed_page(page, (*ioendp)->io_type)) | |
756 | goto fail_unlock_page; | |
757 | ||
24e17b5f NS |
758 | /* |
759 | * page_dirty is initially a count of buffers on the page before | |
c41564b5 | 760 | * EOF and is decremented as we move each into a cleanable state. |
9260dc6b CH |
761 | * |
762 | * Derivation: | |
763 | * | |
764 | * End offset is the highest offset that this page should represent. | |
765 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
766 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
767 | * hence give us the correct page_dirty count. On any other page, | |
768 | * it will be zero and in that case we need page_dirty to be the | |
769 | * count of buffers on the page. | |
24e17b5f | 770 | */ |
9260dc6b CH |
771 | end_offset = min_t(unsigned long long, |
772 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, | |
773 | i_size_read(inode)); | |
774 | ||
24e17b5f | 775 | len = 1 << inode->i_blkbits; |
9260dc6b CH |
776 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
777 | PAGE_CACHE_SIZE); | |
778 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
779 | page_dirty = p_offset / len; | |
24e17b5f | 780 | |
1da177e4 LT |
781 | bh = head = page_buffers(page); |
782 | do { | |
9260dc6b | 783 | if (offset >= end_offset) |
1da177e4 | 784 | break; |
f6d6d4fc CH |
785 | if (!buffer_uptodate(bh)) |
786 | uptodate = 0; | |
787 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { | |
788 | done = 1; | |
1da177e4 | 789 | continue; |
f6d6d4fc CH |
790 | } |
791 | ||
9260dc6b CH |
792 | if (buffer_unwritten(bh) || buffer_delay(bh)) { |
793 | if (buffer_unwritten(bh)) | |
794 | type = IOMAP_UNWRITTEN; | |
795 | else | |
796 | type = IOMAP_DELAY; | |
797 | ||
798 | if (!xfs_iomap_valid(mp, offset)) { | |
f6d6d4fc | 799 | done = 1; |
9260dc6b CH |
800 | continue; |
801 | } | |
802 | ||
803 | ASSERT(!(mp->iomap_flags & IOMAP_HOLE)); | |
804 | ASSERT(!(mp->iomap_flags & IOMAP_DELAY)); | |
805 | ||
806 | xfs_map_at_offset(bh, offset, bbits, mp); | |
807 | if (startio) { | |
7336cea8 | 808 | xfs_add_to_ioend(inode, bh, offset, |
9260dc6b CH |
809 | type, ioendp, done); |
810 | } else { | |
811 | set_buffer_dirty(bh); | |
812 | unlock_buffer(bh); | |
813 | mark_buffer_dirty(bh); | |
814 | } | |
815 | page_dirty--; | |
816 | count++; | |
817 | } else { | |
df3c7244 | 818 | type = IOMAP_NEW; |
9260dc6b | 819 | if (buffer_mapped(bh) && all_bh && startio) { |
1da177e4 | 820 | lock_buffer(bh); |
7336cea8 | 821 | xfs_add_to_ioend(inode, bh, offset, |
f6d6d4fc CH |
822 | type, ioendp, done); |
823 | count++; | |
24e17b5f | 824 | page_dirty--; |
9260dc6b CH |
825 | } else { |
826 | done = 1; | |
1da177e4 | 827 | } |
1da177e4 | 828 | } |
7336cea8 | 829 | } while (offset += len, (bh = bh->b_this_page) != head); |
1da177e4 | 830 | |
f6d6d4fc CH |
831 | if (uptodate && bh == head) |
832 | SetPageUptodate(page); | |
833 | ||
834 | if (startio) { | |
f5e596bb CH |
835 | if (count) { |
836 | struct backing_dev_info *bdi; | |
837 | ||
838 | bdi = inode->i_mapping->backing_dev_info; | |
9fddaca2 | 839 | wbc->nr_to_write--; |
f5e596bb CH |
840 | if (bdi_write_congested(bdi)) { |
841 | wbc->encountered_congestion = 1; | |
842 | done = 1; | |
9fddaca2 | 843 | } else if (wbc->nr_to_write <= 0) { |
f5e596bb CH |
844 | done = 1; |
845 | } | |
846 | } | |
f6d6d4fc | 847 | xfs_start_page_writeback(page, wbc, !page_dirty, count); |
1da177e4 | 848 | } |
f6d6d4fc CH |
849 | |
850 | return done; | |
10ce4444 CH |
851 | fail_unlock_page: |
852 | unlock_page(page); | |
853 | fail: | |
854 | return 1; | |
1da177e4 LT |
855 | } |
856 | ||
857 | /* | |
858 | * Convert & write out a cluster of pages in the same extent as defined | |
859 | * by mp and following the start page. | |
860 | */ | |
861 | STATIC void | |
862 | xfs_cluster_write( | |
863 | struct inode *inode, | |
864 | pgoff_t tindex, | |
865 | xfs_iomap_t *iomapp, | |
f6d6d4fc | 866 | xfs_ioend_t **ioendp, |
1da177e4 LT |
867 | struct writeback_control *wbc, |
868 | int startio, | |
869 | int all_bh, | |
870 | pgoff_t tlast) | |
871 | { | |
10ce4444 CH |
872 | struct pagevec pvec; |
873 | int done = 0, i; | |
1da177e4 | 874 | |
10ce4444 CH |
875 | pagevec_init(&pvec, 0); |
876 | while (!done && tindex <= tlast) { | |
877 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
878 | ||
879 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
1da177e4 | 880 | break; |
10ce4444 CH |
881 | |
882 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
883 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, | |
884 | iomapp, ioendp, wbc, startio, all_bh); | |
885 | if (done) | |
886 | break; | |
887 | } | |
888 | ||
889 | pagevec_release(&pvec); | |
890 | cond_resched(); | |
1da177e4 LT |
891 | } |
892 | } | |
893 | ||
894 | /* | |
895 | * Calling this without startio set means we are being asked to make a dirty | |
896 | * page ready for freeing it's buffers. When called with startio set then | |
897 | * we are coming from writepage. | |
898 | * | |
899 | * When called with startio set it is important that we write the WHOLE | |
900 | * page if possible. | |
901 | * The bh->b_state's cannot know if any of the blocks or which block for | |
902 | * that matter are dirty due to mmap writes, and therefore bh uptodate is | |
c41564b5 | 903 | * only valid if the page itself isn't completely uptodate. Some layers |
1da177e4 LT |
904 | * may clear the page dirty flag prior to calling write page, under the |
905 | * assumption the entire page will be written out; by not writing out the | |
906 | * whole page the page can be reused before all valid dirty data is | |
907 | * written out. Note: in the case of a page that has been dirty'd by | |
908 | * mapwrite and but partially setup by block_prepare_write the | |
909 | * bh->b_states's will not agree and only ones setup by BPW/BCW will have | |
910 | * valid state, thus the whole page must be written out thing. | |
911 | */ | |
912 | ||
913 | STATIC int | |
914 | xfs_page_state_convert( | |
915 | struct inode *inode, | |
916 | struct page *page, | |
917 | struct writeback_control *wbc, | |
918 | int startio, | |
919 | int unmapped) /* also implies page uptodate */ | |
920 | { | |
f6d6d4fc | 921 | struct buffer_head *bh, *head; |
1defeac9 | 922 | xfs_iomap_t iomap; |
f6d6d4fc | 923 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
1da177e4 LT |
924 | loff_t offset; |
925 | unsigned long p_offset = 0; | |
f6d6d4fc | 926 | unsigned int type; |
1da177e4 LT |
927 | __uint64_t end_offset; |
928 | pgoff_t end_index, last_index, tlast; | |
d5cb48aa CH |
929 | ssize_t size, len; |
930 | int flags, err, iomap_valid = 0, uptodate = 1; | |
8272145c NS |
931 | int page_dirty, count = 0; |
932 | int trylock = 0; | |
6c4fe19f | 933 | int all_bh = unmapped; |
1da177e4 | 934 | |
8272145c NS |
935 | if (startio) { |
936 | if (wbc->sync_mode == WB_SYNC_NONE && wbc->nonblocking) | |
937 | trylock |= BMAPI_TRYLOCK; | |
938 | } | |
3ba0815a | 939 | |
1da177e4 LT |
940 | /* Is this page beyond the end of the file? */ |
941 | offset = i_size_read(inode); | |
942 | end_index = offset >> PAGE_CACHE_SHIFT; | |
943 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; | |
944 | if (page->index >= end_index) { | |
945 | if ((page->index >= end_index + 1) || | |
946 | !(i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) { | |
19d5bcf3 NS |
947 | if (startio) |
948 | unlock_page(page); | |
949 | return 0; | |
1da177e4 LT |
950 | } |
951 | } | |
952 | ||
1da177e4 | 953 | /* |
24e17b5f | 954 | * page_dirty is initially a count of buffers on the page before |
c41564b5 | 955 | * EOF and is decremented as we move each into a cleanable state. |
f6d6d4fc CH |
956 | * |
957 | * Derivation: | |
958 | * | |
959 | * End offset is the highest offset that this page should represent. | |
960 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
961 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
962 | * hence give us the correct page_dirty count. On any other page, | |
963 | * it will be zero and in that case we need page_dirty to be the | |
964 | * count of buffers on the page. | |
965 | */ | |
966 | end_offset = min_t(unsigned long long, | |
967 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, offset); | |
24e17b5f | 968 | len = 1 << inode->i_blkbits; |
f6d6d4fc CH |
969 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
970 | PAGE_CACHE_SIZE); | |
971 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
24e17b5f NS |
972 | page_dirty = p_offset / len; |
973 | ||
24e17b5f | 974 | bh = head = page_buffers(page); |
f6d6d4fc | 975 | offset = page_offset(page); |
df3c7244 DC |
976 | flags = BMAPI_READ; |
977 | type = IOMAP_NEW; | |
f6d6d4fc | 978 | |
f6d6d4fc | 979 | /* TODO: cleanup count and page_dirty */ |
1da177e4 LT |
980 | |
981 | do { | |
982 | if (offset >= end_offset) | |
983 | break; | |
984 | if (!buffer_uptodate(bh)) | |
985 | uptodate = 0; | |
f6d6d4fc | 986 | if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio) { |
1defeac9 CH |
987 | /* |
988 | * the iomap is actually still valid, but the ioend | |
989 | * isn't. shouldn't happen too often. | |
990 | */ | |
991 | iomap_valid = 0; | |
1da177e4 | 992 | continue; |
f6d6d4fc | 993 | } |
1da177e4 | 994 | |
1defeac9 CH |
995 | if (iomap_valid) |
996 | iomap_valid = xfs_iomap_valid(&iomap, offset); | |
1da177e4 LT |
997 | |
998 | /* | |
999 | * First case, map an unwritten extent and prepare for | |
1000 | * extent state conversion transaction on completion. | |
f6d6d4fc | 1001 | * |
1da177e4 LT |
1002 | * Second case, allocate space for a delalloc buffer. |
1003 | * We can return EAGAIN here in the release page case. | |
d5cb48aa CH |
1004 | * |
1005 | * Third case, an unmapped buffer was found, and we are | |
1006 | * in a path where we need to write the whole page out. | |
df3c7244 | 1007 | */ |
d5cb48aa CH |
1008 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
1009 | ((buffer_uptodate(bh) || PageUptodate(page)) && | |
1010 | !buffer_mapped(bh) && (unmapped || startio))) { | |
df3c7244 | 1011 | /* |
6c4fe19f CH |
1012 | * Make sure we don't use a read-only iomap |
1013 | */ | |
df3c7244 | 1014 | if (flags == BMAPI_READ) |
6c4fe19f CH |
1015 | iomap_valid = 0; |
1016 | ||
f6d6d4fc CH |
1017 | if (buffer_unwritten(bh)) { |
1018 | type = IOMAP_UNWRITTEN; | |
8272145c | 1019 | flags = BMAPI_WRITE | BMAPI_IGNSTATE; |
d5cb48aa | 1020 | } else if (buffer_delay(bh)) { |
f6d6d4fc | 1021 | type = IOMAP_DELAY; |
8272145c | 1022 | flags = BMAPI_ALLOCATE | trylock; |
d5cb48aa | 1023 | } else { |
6c4fe19f | 1024 | type = IOMAP_NEW; |
8272145c | 1025 | flags = BMAPI_WRITE | BMAPI_MMAP; |
f6d6d4fc CH |
1026 | } |
1027 | ||
1defeac9 | 1028 | if (!iomap_valid) { |
6c4fe19f CH |
1029 | if (type == IOMAP_NEW) { |
1030 | size = xfs_probe_cluster(inode, | |
1031 | page, bh, head, 0); | |
d5cb48aa CH |
1032 | } else { |
1033 | size = len; | |
1034 | } | |
1035 | ||
1036 | err = xfs_map_blocks(inode, offset, size, | |
1037 | &iomap, flags); | |
f6d6d4fc | 1038 | if (err) |
1da177e4 | 1039 | goto error; |
1defeac9 | 1040 | iomap_valid = xfs_iomap_valid(&iomap, offset); |
1da177e4 | 1041 | } |
1defeac9 CH |
1042 | if (iomap_valid) { |
1043 | xfs_map_at_offset(bh, offset, | |
1044 | inode->i_blkbits, &iomap); | |
1da177e4 | 1045 | if (startio) { |
7336cea8 | 1046 | xfs_add_to_ioend(inode, bh, offset, |
1defeac9 CH |
1047 | type, &ioend, |
1048 | !iomap_valid); | |
1da177e4 LT |
1049 | } else { |
1050 | set_buffer_dirty(bh); | |
1051 | unlock_buffer(bh); | |
1052 | mark_buffer_dirty(bh); | |
1053 | } | |
1054 | page_dirty--; | |
f6d6d4fc | 1055 | count++; |
1da177e4 | 1056 | } |
d5cb48aa | 1057 | } else if (buffer_uptodate(bh) && startio) { |
6c4fe19f CH |
1058 | /* |
1059 | * we got here because the buffer is already mapped. | |
1060 | * That means it must already have extents allocated | |
1061 | * underneath it. Map the extent by reading it. | |
1062 | */ | |
df3c7244 | 1063 | if (!iomap_valid || flags != BMAPI_READ) { |
6c4fe19f CH |
1064 | flags = BMAPI_READ; |
1065 | size = xfs_probe_cluster(inode, page, bh, | |
1066 | head, 1); | |
1067 | err = xfs_map_blocks(inode, offset, size, | |
1068 | &iomap, flags); | |
1069 | if (err) | |
1070 | goto error; | |
1071 | iomap_valid = xfs_iomap_valid(&iomap, offset); | |
1072 | } | |
d5cb48aa | 1073 | |
df3c7244 DC |
1074 | /* |
1075 | * We set the type to IOMAP_NEW in case we are doing a | |
1076 | * small write at EOF that is extending the file but | |
1077 | * without needing an allocation. We need to update the | |
1078 | * file size on I/O completion in this case so it is | |
1079 | * the same case as having just allocated a new extent | |
1080 | * that we are writing into for the first time. | |
1081 | */ | |
1082 | type = IOMAP_NEW; | |
d5cb48aa CH |
1083 | if (!test_and_set_bit(BH_Lock, &bh->b_state)) { |
1084 | ASSERT(buffer_mapped(bh)); | |
6c4fe19f CH |
1085 | if (iomap_valid) |
1086 | all_bh = 1; | |
7336cea8 | 1087 | xfs_add_to_ioend(inode, bh, offset, type, |
d5cb48aa CH |
1088 | &ioend, !iomap_valid); |
1089 | page_dirty--; | |
1090 | count++; | |
f6d6d4fc | 1091 | } else { |
1defeac9 | 1092 | iomap_valid = 0; |
1da177e4 | 1093 | } |
d5cb48aa CH |
1094 | } else if ((buffer_uptodate(bh) || PageUptodate(page)) && |
1095 | (unmapped || startio)) { | |
1096 | iomap_valid = 0; | |
1da177e4 | 1097 | } |
f6d6d4fc CH |
1098 | |
1099 | if (!iohead) | |
1100 | iohead = ioend; | |
1101 | ||
1102 | } while (offset += len, ((bh = bh->b_this_page) != head)); | |
1da177e4 LT |
1103 | |
1104 | if (uptodate && bh == head) | |
1105 | SetPageUptodate(page); | |
1106 | ||
f6d6d4fc CH |
1107 | if (startio) |
1108 | xfs_start_page_writeback(page, wbc, 1, count); | |
1da177e4 | 1109 | |
1defeac9 CH |
1110 | if (ioend && iomap_valid) { |
1111 | offset = (iomap.iomap_offset + iomap.iomap_bsize - 1) >> | |
1da177e4 | 1112 | PAGE_CACHE_SHIFT; |
775bf6c9 | 1113 | tlast = min_t(pgoff_t, offset, last_index); |
1defeac9 | 1114 | xfs_cluster_write(inode, page->index + 1, &iomap, &ioend, |
6c4fe19f | 1115 | wbc, startio, all_bh, tlast); |
1da177e4 LT |
1116 | } |
1117 | ||
f6d6d4fc CH |
1118 | if (iohead) |
1119 | xfs_submit_ioend(iohead); | |
1120 | ||
1da177e4 LT |
1121 | return page_dirty; |
1122 | ||
1123 | error: | |
f6d6d4fc CH |
1124 | if (iohead) |
1125 | xfs_cancel_ioend(iohead); | |
1da177e4 LT |
1126 | |
1127 | /* | |
1128 | * If it's delalloc and we have nowhere to put it, | |
1129 | * throw it away, unless the lower layers told | |
1130 | * us to try again. | |
1131 | */ | |
1132 | if (err != -EAGAIN) { | |
f6d6d4fc | 1133 | if (!unmapped) |
1da177e4 | 1134 | block_invalidatepage(page, 0); |
1da177e4 LT |
1135 | ClearPageUptodate(page); |
1136 | } | |
1137 | return err; | |
1138 | } | |
1139 | ||
f51623b2 NS |
1140 | /* |
1141 | * writepage: Called from one of two places: | |
1142 | * | |
1143 | * 1. we are flushing a delalloc buffer head. | |
1144 | * | |
1145 | * 2. we are writing out a dirty page. Typically the page dirty | |
1146 | * state is cleared before we get here. In this case is it | |
1147 | * conceivable we have no buffer heads. | |
1148 | * | |
1149 | * For delalloc space on the page we need to allocate space and | |
1150 | * flush it. For unmapped buffer heads on the page we should | |
1151 | * allocate space if the page is uptodate. For any other dirty | |
1152 | * buffer heads on the page we should flush them. | |
1153 | * | |
1154 | * If we detect that a transaction would be required to flush | |
1155 | * the page, we have to check the process flags first, if we | |
1156 | * are already in a transaction or disk I/O during allocations | |
1157 | * is off, we need to fail the writepage and redirty the page. | |
1158 | */ | |
1159 | ||
1160 | STATIC int | |
e4c573bb | 1161 | xfs_vm_writepage( |
f51623b2 NS |
1162 | struct page *page, |
1163 | struct writeback_control *wbc) | |
1164 | { | |
1165 | int error; | |
1166 | int need_trans; | |
1167 | int delalloc, unmapped, unwritten; | |
1168 | struct inode *inode = page->mapping->host; | |
1169 | ||
1170 | xfs_page_trace(XFS_WRITEPAGE_ENTER, inode, page, 0); | |
1171 | ||
1172 | /* | |
1173 | * We need a transaction if: | |
1174 | * 1. There are delalloc buffers on the page | |
1175 | * 2. The page is uptodate and we have unmapped buffers | |
1176 | * 3. The page is uptodate and we have no buffers | |
1177 | * 4. There are unwritten buffers on the page | |
1178 | */ | |
1179 | ||
1180 | if (!page_has_buffers(page)) { | |
1181 | unmapped = 1; | |
1182 | need_trans = 1; | |
1183 | } else { | |
1184 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); | |
1185 | if (!PageUptodate(page)) | |
1186 | unmapped = 0; | |
1187 | need_trans = delalloc + unmapped + unwritten; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * If we need a transaction and the process flags say | |
1192 | * we are already in a transaction, or no IO is allowed | |
1193 | * then mark the page dirty again and leave the page | |
1194 | * as is. | |
1195 | */ | |
59c1b082 | 1196 | if (current_test_flags(PF_FSTRANS) && need_trans) |
f51623b2 NS |
1197 | goto out_fail; |
1198 | ||
1199 | /* | |
1200 | * Delay hooking up buffer heads until we have | |
1201 | * made our go/no-go decision. | |
1202 | */ | |
1203 | if (!page_has_buffers(page)) | |
1204 | create_empty_buffers(page, 1 << inode->i_blkbits, 0); | |
1205 | ||
1206 | /* | |
1207 | * Convert delayed allocate, unwritten or unmapped space | |
1208 | * to real space and flush out to disk. | |
1209 | */ | |
1210 | error = xfs_page_state_convert(inode, page, wbc, 1, unmapped); | |
1211 | if (error == -EAGAIN) | |
1212 | goto out_fail; | |
1213 | if (unlikely(error < 0)) | |
1214 | goto out_unlock; | |
1215 | ||
1216 | return 0; | |
1217 | ||
1218 | out_fail: | |
1219 | redirty_page_for_writepage(wbc, page); | |
1220 | unlock_page(page); | |
1221 | return 0; | |
1222 | out_unlock: | |
1223 | unlock_page(page); | |
1224 | return error; | |
1225 | } | |
1226 | ||
7d4fb40a NS |
1227 | STATIC int |
1228 | xfs_vm_writepages( | |
1229 | struct address_space *mapping, | |
1230 | struct writeback_control *wbc) | |
1231 | { | |
67fcaa73 | 1232 | struct bhv_vnode *vp = vn_from_inode(mapping->host); |
7d4fb40a NS |
1233 | |
1234 | if (VN_TRUNC(vp)) | |
1235 | VUNTRUNCATE(vp); | |
1236 | return generic_writepages(mapping, wbc); | |
1237 | } | |
1238 | ||
f51623b2 NS |
1239 | /* |
1240 | * Called to move a page into cleanable state - and from there | |
1241 | * to be released. Possibly the page is already clean. We always | |
1242 | * have buffer heads in this call. | |
1243 | * | |
1244 | * Returns 0 if the page is ok to release, 1 otherwise. | |
1245 | * | |
1246 | * Possible scenarios are: | |
1247 | * | |
1248 | * 1. We are being called to release a page which has been written | |
1249 | * to via regular I/O. buffer heads will be dirty and possibly | |
1250 | * delalloc. If no delalloc buffer heads in this case then we | |
1251 | * can just return zero. | |
1252 | * | |
1253 | * 2. We are called to release a page which has been written via | |
1254 | * mmap, all we need to do is ensure there is no delalloc | |
1255 | * state in the buffer heads, if not we can let the caller | |
1256 | * free them and we should come back later via writepage. | |
1257 | */ | |
1258 | STATIC int | |
238f4c54 | 1259 | xfs_vm_releasepage( |
f51623b2 NS |
1260 | struct page *page, |
1261 | gfp_t gfp_mask) | |
1262 | { | |
1263 | struct inode *inode = page->mapping->host; | |
1264 | int dirty, delalloc, unmapped, unwritten; | |
1265 | struct writeback_control wbc = { | |
1266 | .sync_mode = WB_SYNC_ALL, | |
1267 | .nr_to_write = 1, | |
1268 | }; | |
1269 | ||
ed9d88f7 | 1270 | xfs_page_trace(XFS_RELEASEPAGE_ENTER, inode, page, 0); |
f51623b2 | 1271 | |
238f4c54 NS |
1272 | if (!page_has_buffers(page)) |
1273 | return 0; | |
1274 | ||
f51623b2 NS |
1275 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); |
1276 | if (!delalloc && !unwritten) | |
1277 | goto free_buffers; | |
1278 | ||
1279 | if (!(gfp_mask & __GFP_FS)) | |
1280 | return 0; | |
1281 | ||
1282 | /* If we are already inside a transaction or the thread cannot | |
1283 | * do I/O, we cannot release this page. | |
1284 | */ | |
59c1b082 | 1285 | if (current_test_flags(PF_FSTRANS)) |
f51623b2 NS |
1286 | return 0; |
1287 | ||
1288 | /* | |
1289 | * Convert delalloc space to real space, do not flush the | |
1290 | * data out to disk, that will be done by the caller. | |
1291 | * Never need to allocate space here - we will always | |
1292 | * come back to writepage in that case. | |
1293 | */ | |
1294 | dirty = xfs_page_state_convert(inode, page, &wbc, 0, 0); | |
1295 | if (dirty == 0 && !unwritten) | |
1296 | goto free_buffers; | |
1297 | return 0; | |
1298 | ||
1299 | free_buffers: | |
1300 | return try_to_free_buffers(page); | |
1301 | } | |
1302 | ||
1da177e4 | 1303 | STATIC int |
c2536668 | 1304 | __xfs_get_blocks( |
1da177e4 LT |
1305 | struct inode *inode, |
1306 | sector_t iblock, | |
1da177e4 LT |
1307 | struct buffer_head *bh_result, |
1308 | int create, | |
1309 | int direct, | |
1310 | bmapi_flags_t flags) | |
1311 | { | |
67fcaa73 | 1312 | bhv_vnode_t *vp = vn_from_inode(inode); |
1da177e4 | 1313 | xfs_iomap_t iomap; |
fdc7ed75 NS |
1314 | xfs_off_t offset; |
1315 | ssize_t size; | |
c2536668 | 1316 | int niomap = 1; |
1da177e4 | 1317 | int error; |
1da177e4 | 1318 | |
fdc7ed75 | 1319 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
c2536668 NS |
1320 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
1321 | size = bh_result->b_size; | |
67fcaa73 NS |
1322 | error = bhv_vop_bmap(vp, offset, size, |
1323 | create ? flags : BMAPI_READ, &iomap, &niomap); | |
1da177e4 LT |
1324 | if (error) |
1325 | return -error; | |
c2536668 | 1326 | if (niomap == 0) |
1da177e4 LT |
1327 | return 0; |
1328 | ||
1329 | if (iomap.iomap_bn != IOMAP_DADDR_NULL) { | |
87cbc49c NS |
1330 | /* |
1331 | * For unwritten extents do not report a disk address on | |
1da177e4 LT |
1332 | * the read case (treat as if we're reading into a hole). |
1333 | */ | |
1334 | if (create || !(iomap.iomap_flags & IOMAP_UNWRITTEN)) { | |
87cbc49c NS |
1335 | xfs_map_buffer(bh_result, &iomap, offset, |
1336 | inode->i_blkbits); | |
1da177e4 LT |
1337 | } |
1338 | if (create && (iomap.iomap_flags & IOMAP_UNWRITTEN)) { | |
1339 | if (direct) | |
1340 | bh_result->b_private = inode; | |
1341 | set_buffer_unwritten(bh_result); | |
1da177e4 LT |
1342 | } |
1343 | } | |
1344 | ||
c2536668 NS |
1345 | /* |
1346 | * If this is a realtime file, data may be on a different device. | |
1347 | * to that pointed to from the buffer_head b_bdev currently. | |
1348 | */ | |
ce8e922c | 1349 | bh_result->b_bdev = iomap.iomap_target->bt_bdev; |
1da177e4 | 1350 | |
c2536668 | 1351 | /* |
549054af DC |
1352 | * If we previously allocated a block out beyond eof and we are now |
1353 | * coming back to use it then we will need to flag it as new even if it | |
1354 | * has a disk address. | |
1355 | * | |
1356 | * With sub-block writes into unwritten extents we also need to mark | |
1357 | * the buffer as new so that the unwritten parts of the buffer gets | |
1358 | * correctly zeroed. | |
1da177e4 LT |
1359 | */ |
1360 | if (create && | |
1361 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || | |
549054af DC |
1362 | (offset >= i_size_read(inode)) || |
1363 | (iomap.iomap_flags & (IOMAP_NEW|IOMAP_UNWRITTEN)))) | |
1da177e4 | 1364 | set_buffer_new(bh_result); |
1da177e4 LT |
1365 | |
1366 | if (iomap.iomap_flags & IOMAP_DELAY) { | |
1367 | BUG_ON(direct); | |
1368 | if (create) { | |
1369 | set_buffer_uptodate(bh_result); | |
1370 | set_buffer_mapped(bh_result); | |
1371 | set_buffer_delay(bh_result); | |
1372 | } | |
1373 | } | |
1374 | ||
c2536668 | 1375 | if (direct || size > (1 << inode->i_blkbits)) { |
fdc7ed75 NS |
1376 | ASSERT(iomap.iomap_bsize - iomap.iomap_delta > 0); |
1377 | offset = min_t(xfs_off_t, | |
c2536668 NS |
1378 | iomap.iomap_bsize - iomap.iomap_delta, size); |
1379 | bh_result->b_size = (ssize_t)min_t(xfs_off_t, LONG_MAX, offset); | |
1da177e4 LT |
1380 | } |
1381 | ||
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | int | |
c2536668 | 1386 | xfs_get_blocks( |
1da177e4 LT |
1387 | struct inode *inode, |
1388 | sector_t iblock, | |
1389 | struct buffer_head *bh_result, | |
1390 | int create) | |
1391 | { | |
c2536668 | 1392 | return __xfs_get_blocks(inode, iblock, |
fa30bd05 | 1393 | bh_result, create, 0, BMAPI_WRITE); |
1da177e4 LT |
1394 | } |
1395 | ||
1396 | STATIC int | |
e4c573bb | 1397 | xfs_get_blocks_direct( |
1da177e4 LT |
1398 | struct inode *inode, |
1399 | sector_t iblock, | |
1da177e4 LT |
1400 | struct buffer_head *bh_result, |
1401 | int create) | |
1402 | { | |
c2536668 | 1403 | return __xfs_get_blocks(inode, iblock, |
1d8fa7a2 | 1404 | bh_result, create, 1, BMAPI_WRITE|BMAPI_DIRECT); |
1da177e4 LT |
1405 | } |
1406 | ||
f0973863 | 1407 | STATIC void |
e4c573bb | 1408 | xfs_end_io_direct( |
f0973863 CH |
1409 | struct kiocb *iocb, |
1410 | loff_t offset, | |
1411 | ssize_t size, | |
1412 | void *private) | |
1413 | { | |
1414 | xfs_ioend_t *ioend = iocb->private; | |
1415 | ||
1416 | /* | |
1417 | * Non-NULL private data means we need to issue a transaction to | |
1418 | * convert a range from unwritten to written extents. This needs | |
c41564b5 | 1419 | * to happen from process context but aio+dio I/O completion |
f0973863 | 1420 | * happens from irq context so we need to defer it to a workqueue. |
c41564b5 | 1421 | * This is not necessary for synchronous direct I/O, but we do |
f0973863 CH |
1422 | * it anyway to keep the code uniform and simpler. |
1423 | * | |
e927af90 DC |
1424 | * Well, if only it were that simple. Because synchronous direct I/O |
1425 | * requires extent conversion to occur *before* we return to userspace, | |
1426 | * we have to wait for extent conversion to complete. Look at the | |
1427 | * iocb that has been passed to us to determine if this is AIO or | |
1428 | * not. If it is synchronous, tell xfs_finish_ioend() to kick the | |
1429 | * workqueue and wait for it to complete. | |
1430 | * | |
f0973863 CH |
1431 | * The core direct I/O code might be changed to always call the |
1432 | * completion handler in the future, in which case all this can | |
1433 | * go away. | |
1434 | */ | |
ba87ea69 LM |
1435 | ioend->io_offset = offset; |
1436 | ioend->io_size = size; | |
1437 | if (ioend->io_type == IOMAP_READ) { | |
e927af90 | 1438 | xfs_finish_ioend(ioend, 0); |
ba87ea69 | 1439 | } else if (private && size > 0) { |
e927af90 | 1440 | xfs_finish_ioend(ioend, is_sync_kiocb(iocb)); |
f0973863 | 1441 | } else { |
ba87ea69 LM |
1442 | /* |
1443 | * A direct I/O write ioend starts it's life in unwritten | |
1444 | * state in case they map an unwritten extent. This write | |
1445 | * didn't map an unwritten extent so switch it's completion | |
1446 | * handler. | |
1447 | */ | |
1448 | INIT_WORK(&ioend->io_work, xfs_end_bio_written); | |
e927af90 | 1449 | xfs_finish_ioend(ioend, 0); |
f0973863 CH |
1450 | } |
1451 | ||
1452 | /* | |
c41564b5 | 1453 | * blockdev_direct_IO can return an error even after the I/O |
f0973863 CH |
1454 | * completion handler was called. Thus we need to protect |
1455 | * against double-freeing. | |
1456 | */ | |
1457 | iocb->private = NULL; | |
1458 | } | |
1459 | ||
1da177e4 | 1460 | STATIC ssize_t |
e4c573bb | 1461 | xfs_vm_direct_IO( |
1da177e4 LT |
1462 | int rw, |
1463 | struct kiocb *iocb, | |
1464 | const struct iovec *iov, | |
1465 | loff_t offset, | |
1466 | unsigned long nr_segs) | |
1467 | { | |
1468 | struct file *file = iocb->ki_filp; | |
1469 | struct inode *inode = file->f_mapping->host; | |
67fcaa73 | 1470 | bhv_vnode_t *vp = vn_from_inode(inode); |
1da177e4 LT |
1471 | xfs_iomap_t iomap; |
1472 | int maps = 1; | |
1473 | int error; | |
f0973863 | 1474 | ssize_t ret; |
1da177e4 | 1475 | |
67fcaa73 | 1476 | error = bhv_vop_bmap(vp, offset, 0, BMAPI_DEVICE, &iomap, &maps); |
1da177e4 LT |
1477 | if (error) |
1478 | return -error; | |
1479 | ||
721259bc | 1480 | if (rw == WRITE) { |
ba87ea69 | 1481 | iocb->private = xfs_alloc_ioend(inode, IOMAP_UNWRITTEN); |
721259bc LM |
1482 | ret = blockdev_direct_IO_own_locking(rw, iocb, inode, |
1483 | iomap.iomap_target->bt_bdev, | |
1484 | iov, offset, nr_segs, | |
1485 | xfs_get_blocks_direct, | |
1486 | xfs_end_io_direct); | |
1487 | } else { | |
ba87ea69 | 1488 | iocb->private = xfs_alloc_ioend(inode, IOMAP_READ); |
721259bc LM |
1489 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
1490 | iomap.iomap_target->bt_bdev, | |
1491 | iov, offset, nr_segs, | |
1492 | xfs_get_blocks_direct, | |
1493 | xfs_end_io_direct); | |
1494 | } | |
f0973863 | 1495 | |
8459d86a | 1496 | if (unlikely(ret != -EIOCBQUEUED && iocb->private)) |
f0973863 CH |
1497 | xfs_destroy_ioend(iocb->private); |
1498 | return ret; | |
1da177e4 LT |
1499 | } |
1500 | ||
f51623b2 | 1501 | STATIC int |
e4c573bb | 1502 | xfs_vm_prepare_write( |
f51623b2 NS |
1503 | struct file *file, |
1504 | struct page *page, | |
1505 | unsigned int from, | |
1506 | unsigned int to) | |
1507 | { | |
c2536668 | 1508 | return block_prepare_write(page, from, to, xfs_get_blocks); |
f51623b2 | 1509 | } |
1da177e4 LT |
1510 | |
1511 | STATIC sector_t | |
e4c573bb | 1512 | xfs_vm_bmap( |
1da177e4 LT |
1513 | struct address_space *mapping, |
1514 | sector_t block) | |
1515 | { | |
1516 | struct inode *inode = (struct inode *)mapping->host; | |
67fcaa73 | 1517 | bhv_vnode_t *vp = vn_from_inode(inode); |
1da177e4 | 1518 | |
e4c573bb | 1519 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); |
67fcaa73 NS |
1520 | bhv_vop_rwlock(vp, VRWLOCK_READ); |
1521 | bhv_vop_flush_pages(vp, (xfs_off_t)0, -1, 0, FI_REMAPF); | |
1522 | bhv_vop_rwunlock(vp, VRWLOCK_READ); | |
c2536668 | 1523 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
1da177e4 LT |
1524 | } |
1525 | ||
1526 | STATIC int | |
e4c573bb | 1527 | xfs_vm_readpage( |
1da177e4 LT |
1528 | struct file *unused, |
1529 | struct page *page) | |
1530 | { | |
c2536668 | 1531 | return mpage_readpage(page, xfs_get_blocks); |
1da177e4 LT |
1532 | } |
1533 | ||
1534 | STATIC int | |
e4c573bb | 1535 | xfs_vm_readpages( |
1da177e4 LT |
1536 | struct file *unused, |
1537 | struct address_space *mapping, | |
1538 | struct list_head *pages, | |
1539 | unsigned nr_pages) | |
1540 | { | |
c2536668 | 1541 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
1da177e4 LT |
1542 | } |
1543 | ||
2ff28e22 | 1544 | STATIC void |
238f4c54 | 1545 | xfs_vm_invalidatepage( |
bcec2b7f NS |
1546 | struct page *page, |
1547 | unsigned long offset) | |
1548 | { | |
1549 | xfs_page_trace(XFS_INVALIDPAGE_ENTER, | |
1550 | page->mapping->host, page, offset); | |
2ff28e22 | 1551 | block_invalidatepage(page, offset); |
bcec2b7f NS |
1552 | } |
1553 | ||
f5e54d6e | 1554 | const struct address_space_operations xfs_address_space_operations = { |
e4c573bb NS |
1555 | .readpage = xfs_vm_readpage, |
1556 | .readpages = xfs_vm_readpages, | |
1557 | .writepage = xfs_vm_writepage, | |
7d4fb40a | 1558 | .writepages = xfs_vm_writepages, |
1da177e4 | 1559 | .sync_page = block_sync_page, |
238f4c54 NS |
1560 | .releasepage = xfs_vm_releasepage, |
1561 | .invalidatepage = xfs_vm_invalidatepage, | |
e4c573bb | 1562 | .prepare_write = xfs_vm_prepare_write, |
1da177e4 | 1563 | .commit_write = generic_commit_write, |
e4c573bb NS |
1564 | .bmap = xfs_vm_bmap, |
1565 | .direct_IO = xfs_vm_direct_IO, | |
e965f963 | 1566 | .migratepage = buffer_migrate_page, |
1da177e4 | 1567 | }; |