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Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
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" | |
739bfb2a | 40 | #include "xfs_vnodeops.h" |
1da177e4 | 41 | #include <linux/mpage.h> |
10ce4444 | 42 | #include <linux/pagevec.h> |
1da177e4 LT |
43 | #include <linux/writeback.h> |
44 | ||
25e41b3d CH |
45 | |
46 | /* | |
47 | * Prime number of hash buckets since address is used as the key. | |
48 | */ | |
49 | #define NVSYNC 37 | |
50 | #define to_ioend_wq(v) (&xfs_ioend_wq[((unsigned long)v) % NVSYNC]) | |
51 | static wait_queue_head_t xfs_ioend_wq[NVSYNC]; | |
52 | ||
53 | void __init | |
54 | xfs_ioend_init(void) | |
55 | { | |
56 | int i; | |
57 | ||
58 | for (i = 0; i < NVSYNC; i++) | |
59 | init_waitqueue_head(&xfs_ioend_wq[i]); | |
60 | } | |
61 | ||
62 | void | |
63 | xfs_ioend_wait( | |
64 | xfs_inode_t *ip) | |
65 | { | |
66 | wait_queue_head_t *wq = to_ioend_wq(ip); | |
67 | ||
68 | wait_event(*wq, (atomic_read(&ip->i_iocount) == 0)); | |
69 | } | |
70 | ||
71 | STATIC void | |
72 | xfs_ioend_wake( | |
73 | xfs_inode_t *ip) | |
74 | { | |
75 | if (atomic_dec_and_test(&ip->i_iocount)) | |
76 | wake_up(to_ioend_wq(ip)); | |
77 | } | |
78 | ||
f51623b2 NS |
79 | STATIC void |
80 | xfs_count_page_state( | |
81 | struct page *page, | |
82 | int *delalloc, | |
83 | int *unmapped, | |
84 | int *unwritten) | |
85 | { | |
86 | struct buffer_head *bh, *head; | |
87 | ||
88 | *delalloc = *unmapped = *unwritten = 0; | |
89 | ||
90 | bh = head = page_buffers(page); | |
91 | do { | |
92 | if (buffer_uptodate(bh) && !buffer_mapped(bh)) | |
93 | (*unmapped) = 1; | |
f51623b2 NS |
94 | else if (buffer_unwritten(bh)) |
95 | (*unwritten) = 1; | |
96 | else if (buffer_delay(bh)) | |
97 | (*delalloc) = 1; | |
98 | } while ((bh = bh->b_this_page) != head); | |
99 | } | |
100 | ||
1da177e4 LT |
101 | #if defined(XFS_RW_TRACE) |
102 | void | |
103 | xfs_page_trace( | |
104 | int tag, | |
105 | struct inode *inode, | |
106 | struct page *page, | |
ed9d88f7 | 107 | unsigned long pgoff) |
1da177e4 LT |
108 | { |
109 | xfs_inode_t *ip; | |
1da177e4 | 110 | loff_t isize = i_size_read(inode); |
f6d6d4fc | 111 | loff_t offset = page_offset(page); |
1da177e4 LT |
112 | int delalloc = -1, unmapped = -1, unwritten = -1; |
113 | ||
114 | if (page_has_buffers(page)) | |
115 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); | |
116 | ||
e6064d30 | 117 | ip = XFS_I(inode); |
1da177e4 LT |
118 | if (!ip->i_rwtrace) |
119 | return; | |
120 | ||
121 | ktrace_enter(ip->i_rwtrace, | |
122 | (void *)((unsigned long)tag), | |
123 | (void *)ip, | |
124 | (void *)inode, | |
125 | (void *)page, | |
ed9d88f7 | 126 | (void *)pgoff, |
1da177e4 LT |
127 | (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), |
128 | (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), | |
129 | (void *)((unsigned long)((isize >> 32) & 0xffffffff)), | |
130 | (void *)((unsigned long)(isize & 0xffffffff)), | |
131 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
132 | (void *)((unsigned long)(offset & 0xffffffff)), | |
133 | (void *)((unsigned long)delalloc), | |
134 | (void *)((unsigned long)unmapped), | |
135 | (void *)((unsigned long)unwritten), | |
f1fdc848 | 136 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
137 | (void *)NULL); |
138 | } | |
139 | #else | |
ed9d88f7 | 140 | #define xfs_page_trace(tag, inode, page, pgoff) |
1da177e4 LT |
141 | #endif |
142 | ||
6214ed44 CH |
143 | STATIC struct block_device * |
144 | xfs_find_bdev_for_inode( | |
145 | struct xfs_inode *ip) | |
146 | { | |
147 | struct xfs_mount *mp = ip->i_mount; | |
148 | ||
71ddabb9 | 149 | if (XFS_IS_REALTIME_INODE(ip)) |
6214ed44 CH |
150 | return mp->m_rtdev_targp->bt_bdev; |
151 | else | |
152 | return mp->m_ddev_targp->bt_bdev; | |
153 | } | |
154 | ||
f6d6d4fc CH |
155 | /* |
156 | * We're now finished for good with this ioend structure. | |
157 | * Update the page state via the associated buffer_heads, | |
158 | * release holds on the inode and bio, and finally free | |
159 | * up memory. Do not use the ioend after this. | |
160 | */ | |
0829c360 CH |
161 | STATIC void |
162 | xfs_destroy_ioend( | |
163 | xfs_ioend_t *ioend) | |
164 | { | |
f6d6d4fc | 165 | struct buffer_head *bh, *next; |
583fa586 | 166 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
f6d6d4fc CH |
167 | |
168 | for (bh = ioend->io_buffer_head; bh; bh = next) { | |
169 | next = bh->b_private; | |
7d04a335 | 170 | bh->b_end_io(bh, !ioend->io_error); |
f6d6d4fc | 171 | } |
583fa586 CH |
172 | |
173 | /* | |
174 | * Volume managers supporting multiple paths can send back ENODEV | |
175 | * when the final path disappears. In this case continuing to fill | |
176 | * the page cache with dirty data which cannot be written out is | |
177 | * evil, so prevent that. | |
178 | */ | |
179 | if (unlikely(ioend->io_error == -ENODEV)) { | |
180 | xfs_do_force_shutdown(ip->i_mount, SHUTDOWN_DEVICE_REQ, | |
181 | __FILE__, __LINE__); | |
b677c210 | 182 | } |
583fa586 | 183 | |
25e41b3d | 184 | xfs_ioend_wake(ip); |
0829c360 CH |
185 | mempool_free(ioend, xfs_ioend_pool); |
186 | } | |
187 | ||
932640e8 DC |
188 | /* |
189 | * If the end of the current ioend is beyond the current EOF, | |
190 | * return the new EOF value, otherwise zero. | |
191 | */ | |
192 | STATIC xfs_fsize_t | |
193 | xfs_ioend_new_eof( | |
194 | xfs_ioend_t *ioend) | |
195 | { | |
196 | xfs_inode_t *ip = XFS_I(ioend->io_inode); | |
197 | xfs_fsize_t isize; | |
198 | xfs_fsize_t bsize; | |
199 | ||
200 | bsize = ioend->io_offset + ioend->io_size; | |
201 | isize = MAX(ip->i_size, ip->i_new_size); | |
202 | isize = MIN(isize, bsize); | |
203 | return isize > ip->i_d.di_size ? isize : 0; | |
204 | } | |
205 | ||
ba87ea69 LM |
206 | /* |
207 | * Update on-disk file size now that data has been written to disk. | |
208 | * The current in-memory file size is i_size. If a write is beyond | |
613d7043 | 209 | * eof i_new_size will be the intended file size until i_size is |
ba87ea69 LM |
210 | * updated. If this write does not extend all the way to the valid |
211 | * file size then restrict this update to the end of the write. | |
212 | */ | |
932640e8 | 213 | |
ba87ea69 LM |
214 | STATIC void |
215 | xfs_setfilesize( | |
216 | xfs_ioend_t *ioend) | |
217 | { | |
b677c210 | 218 | xfs_inode_t *ip = XFS_I(ioend->io_inode); |
ba87ea69 | 219 | xfs_fsize_t isize; |
ba87ea69 | 220 | |
ba87ea69 LM |
221 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG); |
222 | ASSERT(ioend->io_type != IOMAP_READ); | |
223 | ||
224 | if (unlikely(ioend->io_error)) | |
225 | return; | |
226 | ||
ba87ea69 | 227 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
932640e8 DC |
228 | isize = xfs_ioend_new_eof(ioend); |
229 | if (isize) { | |
ba87ea69 | 230 | ip->i_d.di_size = isize; |
94b97e39 | 231 | xfs_mark_inode_dirty_sync(ip); |
ba87ea69 LM |
232 | } |
233 | ||
234 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
235 | } | |
236 | ||
0829c360 | 237 | /* |
5ec4fabb | 238 | * IO write completion. |
f6d6d4fc CH |
239 | */ |
240 | STATIC void | |
5ec4fabb | 241 | xfs_end_io( |
c4028958 | 242 | struct work_struct *work) |
0829c360 | 243 | { |
c4028958 DH |
244 | xfs_ioend_t *ioend = |
245 | container_of(work, xfs_ioend_t, io_work); | |
7642861b | 246 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
ba87ea69 | 247 | |
5ec4fabb CH |
248 | /* |
249 | * For unwritten extents we need to issue transactions to convert a | |
250 | * range to normal written extens after the data I/O has finished. | |
251 | */ | |
252 | if (ioend->io_type == IOMAP_UNWRITTEN && | |
253 | likely(!ioend->io_error && !XFS_FORCED_SHUTDOWN(ip->i_mount))) { | |
254 | int error; | |
255 | ||
256 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, | |
257 | ioend->io_size); | |
258 | if (error) | |
259 | ioend->io_error = error; | |
260 | } | |
ba87ea69 | 261 | |
5ec4fabb CH |
262 | /* |
263 | * We might have to update the on-disk file size after extending | |
264 | * writes. | |
265 | */ | |
266 | if (ioend->io_type != IOMAP_READ) | |
267 | xfs_setfilesize(ioend); | |
0829c360 CH |
268 | xfs_destroy_ioend(ioend); |
269 | } | |
270 | ||
c626d174 DC |
271 | /* |
272 | * Schedule IO completion handling on a xfsdatad if this was | |
273 | * the final hold on this ioend. If we are asked to wait, | |
274 | * flush the workqueue. | |
275 | */ | |
276 | STATIC void | |
277 | xfs_finish_ioend( | |
278 | xfs_ioend_t *ioend, | |
279 | int wait) | |
280 | { | |
281 | if (atomic_dec_and_test(&ioend->io_remaining)) { | |
5ec4fabb | 282 | struct workqueue_struct *wq; |
c626d174 | 283 | |
5ec4fabb CH |
284 | wq = (ioend->io_type == IOMAP_UNWRITTEN) ? |
285 | xfsconvertd_workqueue : xfsdatad_workqueue; | |
c626d174 DC |
286 | queue_work(wq, &ioend->io_work); |
287 | if (wait) | |
288 | flush_workqueue(wq); | |
289 | } | |
290 | } | |
291 | ||
0829c360 CH |
292 | /* |
293 | * Allocate and initialise an IO completion structure. | |
294 | * We need to track unwritten extent write completion here initially. | |
295 | * We'll need to extend this for updating the ondisk inode size later | |
296 | * (vs. incore size). | |
297 | */ | |
298 | STATIC xfs_ioend_t * | |
299 | xfs_alloc_ioend( | |
f6d6d4fc CH |
300 | struct inode *inode, |
301 | unsigned int type) | |
0829c360 CH |
302 | { |
303 | xfs_ioend_t *ioend; | |
304 | ||
305 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); | |
306 | ||
307 | /* | |
308 | * Set the count to 1 initially, which will prevent an I/O | |
309 | * completion callback from happening before we have started | |
310 | * all the I/O from calling the completion routine too early. | |
311 | */ | |
312 | atomic_set(&ioend->io_remaining, 1); | |
7d04a335 | 313 | ioend->io_error = 0; |
f6d6d4fc CH |
314 | ioend->io_list = NULL; |
315 | ioend->io_type = type; | |
b677c210 | 316 | ioend->io_inode = inode; |
c1a073bd | 317 | ioend->io_buffer_head = NULL; |
f6d6d4fc | 318 | ioend->io_buffer_tail = NULL; |
b677c210 | 319 | atomic_inc(&XFS_I(ioend->io_inode)->i_iocount); |
0829c360 CH |
320 | ioend->io_offset = 0; |
321 | ioend->io_size = 0; | |
322 | ||
5ec4fabb | 323 | INIT_WORK(&ioend->io_work, xfs_end_io); |
0829c360 CH |
324 | return ioend; |
325 | } | |
326 | ||
1da177e4 LT |
327 | STATIC int |
328 | xfs_map_blocks( | |
329 | struct inode *inode, | |
330 | loff_t offset, | |
331 | ssize_t count, | |
332 | xfs_iomap_t *mapp, | |
333 | int flags) | |
334 | { | |
6bd16ff2 CH |
335 | int nmaps = 1; |
336 | ||
337 | return -xfs_iomap(XFS_I(inode), offset, count, flags, mapp, &nmaps); | |
1da177e4 LT |
338 | } |
339 | ||
b8f82a4a | 340 | STATIC int |
1defeac9 | 341 | xfs_iomap_valid( |
1da177e4 | 342 | xfs_iomap_t *iomapp, |
1defeac9 | 343 | loff_t offset) |
1da177e4 | 344 | { |
1defeac9 CH |
345 | return offset >= iomapp->iomap_offset && |
346 | offset < iomapp->iomap_offset + iomapp->iomap_bsize; | |
1da177e4 LT |
347 | } |
348 | ||
f6d6d4fc CH |
349 | /* |
350 | * BIO completion handler for buffered IO. | |
351 | */ | |
782e3b3b | 352 | STATIC void |
f6d6d4fc CH |
353 | xfs_end_bio( |
354 | struct bio *bio, | |
f6d6d4fc CH |
355 | int error) |
356 | { | |
357 | xfs_ioend_t *ioend = bio->bi_private; | |
358 | ||
f6d6d4fc | 359 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
7d04a335 | 360 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
f6d6d4fc CH |
361 | |
362 | /* Toss bio and pass work off to an xfsdatad thread */ | |
f6d6d4fc CH |
363 | bio->bi_private = NULL; |
364 | bio->bi_end_io = NULL; | |
f6d6d4fc | 365 | bio_put(bio); |
7d04a335 | 366 | |
e927af90 | 367 | xfs_finish_ioend(ioend, 0); |
f6d6d4fc CH |
368 | } |
369 | ||
370 | STATIC void | |
371 | xfs_submit_ioend_bio( | |
06342cf8 CH |
372 | struct writeback_control *wbc, |
373 | xfs_ioend_t *ioend, | |
374 | struct bio *bio) | |
f6d6d4fc CH |
375 | { |
376 | atomic_inc(&ioend->io_remaining); | |
f6d6d4fc CH |
377 | bio->bi_private = ioend; |
378 | bio->bi_end_io = xfs_end_bio; | |
379 | ||
932640e8 DC |
380 | /* |
381 | * If the I/O is beyond EOF we mark the inode dirty immediately | |
382 | * but don't update the inode size until I/O completion. | |
383 | */ | |
384 | if (xfs_ioend_new_eof(ioend)) | |
385 | xfs_mark_inode_dirty_sync(XFS_I(ioend->io_inode)); | |
386 | ||
06342cf8 CH |
387 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? |
388 | WRITE_SYNC_PLUG : WRITE, bio); | |
f6d6d4fc CH |
389 | ASSERT(!bio_flagged(bio, BIO_EOPNOTSUPP)); |
390 | bio_put(bio); | |
391 | } | |
392 | ||
393 | STATIC struct bio * | |
394 | xfs_alloc_ioend_bio( | |
395 | struct buffer_head *bh) | |
396 | { | |
397 | struct bio *bio; | |
398 | int nvecs = bio_get_nr_vecs(bh->b_bdev); | |
399 | ||
400 | do { | |
401 | bio = bio_alloc(GFP_NOIO, nvecs); | |
402 | nvecs >>= 1; | |
403 | } while (!bio); | |
404 | ||
405 | ASSERT(bio->bi_private == NULL); | |
406 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); | |
407 | bio->bi_bdev = bh->b_bdev; | |
408 | bio_get(bio); | |
409 | return bio; | |
410 | } | |
411 | ||
412 | STATIC void | |
413 | xfs_start_buffer_writeback( | |
414 | struct buffer_head *bh) | |
415 | { | |
416 | ASSERT(buffer_mapped(bh)); | |
417 | ASSERT(buffer_locked(bh)); | |
418 | ASSERT(!buffer_delay(bh)); | |
419 | ASSERT(!buffer_unwritten(bh)); | |
420 | ||
421 | mark_buffer_async_write(bh); | |
422 | set_buffer_uptodate(bh); | |
423 | clear_buffer_dirty(bh); | |
424 | } | |
425 | ||
426 | STATIC void | |
427 | xfs_start_page_writeback( | |
428 | struct page *page, | |
f6d6d4fc CH |
429 | int clear_dirty, |
430 | int buffers) | |
431 | { | |
432 | ASSERT(PageLocked(page)); | |
433 | ASSERT(!PageWriteback(page)); | |
f6d6d4fc | 434 | if (clear_dirty) |
92132021 DC |
435 | clear_page_dirty_for_io(page); |
436 | set_page_writeback(page); | |
f6d6d4fc | 437 | unlock_page(page); |
1f7decf6 FW |
438 | /* If no buffers on the page are to be written, finish it here */ |
439 | if (!buffers) | |
f6d6d4fc | 440 | end_page_writeback(page); |
f6d6d4fc CH |
441 | } |
442 | ||
443 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) | |
444 | { | |
445 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
446 | } | |
447 | ||
448 | /* | |
d88992f6 DC |
449 | * Submit all of the bios for all of the ioends we have saved up, covering the |
450 | * initial writepage page and also any probed pages. | |
451 | * | |
452 | * Because we may have multiple ioends spanning a page, we need to start | |
453 | * writeback on all the buffers before we submit them for I/O. If we mark the | |
454 | * buffers as we got, then we can end up with a page that only has buffers | |
455 | * marked async write and I/O complete on can occur before we mark the other | |
456 | * buffers async write. | |
457 | * | |
458 | * The end result of this is that we trip a bug in end_page_writeback() because | |
459 | * we call it twice for the one page as the code in end_buffer_async_write() | |
460 | * assumes that all buffers on the page are started at the same time. | |
461 | * | |
462 | * The fix is two passes across the ioend list - one to start writeback on the | |
c41564b5 | 463 | * buffer_heads, and then submit them for I/O on the second pass. |
f6d6d4fc CH |
464 | */ |
465 | STATIC void | |
466 | xfs_submit_ioend( | |
06342cf8 | 467 | struct writeback_control *wbc, |
f6d6d4fc CH |
468 | xfs_ioend_t *ioend) |
469 | { | |
d88992f6 | 470 | xfs_ioend_t *head = ioend; |
f6d6d4fc CH |
471 | xfs_ioend_t *next; |
472 | struct buffer_head *bh; | |
473 | struct bio *bio; | |
474 | sector_t lastblock = 0; | |
475 | ||
d88992f6 DC |
476 | /* Pass 1 - start writeback */ |
477 | do { | |
478 | next = ioend->io_list; | |
479 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { | |
480 | xfs_start_buffer_writeback(bh); | |
481 | } | |
482 | } while ((ioend = next) != NULL); | |
483 | ||
484 | /* Pass 2 - submit I/O */ | |
485 | ioend = head; | |
f6d6d4fc CH |
486 | do { |
487 | next = ioend->io_list; | |
488 | bio = NULL; | |
489 | ||
490 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { | |
f6d6d4fc CH |
491 | |
492 | if (!bio) { | |
493 | retry: | |
494 | bio = xfs_alloc_ioend_bio(bh); | |
495 | } else if (bh->b_blocknr != lastblock + 1) { | |
06342cf8 | 496 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
497 | goto retry; |
498 | } | |
499 | ||
500 | if (bio_add_buffer(bio, bh) != bh->b_size) { | |
06342cf8 | 501 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
502 | goto retry; |
503 | } | |
504 | ||
505 | lastblock = bh->b_blocknr; | |
506 | } | |
507 | if (bio) | |
06342cf8 | 508 | xfs_submit_ioend_bio(wbc, ioend, bio); |
e927af90 | 509 | xfs_finish_ioend(ioend, 0); |
f6d6d4fc CH |
510 | } while ((ioend = next) != NULL); |
511 | } | |
512 | ||
513 | /* | |
514 | * Cancel submission of all buffer_heads so far in this endio. | |
515 | * Toss the endio too. Only ever called for the initial page | |
516 | * in a writepage request, so only ever one page. | |
517 | */ | |
518 | STATIC void | |
519 | xfs_cancel_ioend( | |
520 | xfs_ioend_t *ioend) | |
521 | { | |
522 | xfs_ioend_t *next; | |
523 | struct buffer_head *bh, *next_bh; | |
524 | ||
525 | do { | |
526 | next = ioend->io_list; | |
527 | bh = ioend->io_buffer_head; | |
528 | do { | |
529 | next_bh = bh->b_private; | |
530 | clear_buffer_async_write(bh); | |
531 | unlock_buffer(bh); | |
532 | } while ((bh = next_bh) != NULL); | |
533 | ||
25e41b3d | 534 | xfs_ioend_wake(XFS_I(ioend->io_inode)); |
f6d6d4fc CH |
535 | mempool_free(ioend, xfs_ioend_pool); |
536 | } while ((ioend = next) != NULL); | |
537 | } | |
538 | ||
539 | /* | |
540 | * Test to see if we've been building up a completion structure for | |
541 | * earlier buffers -- if so, we try to append to this ioend if we | |
542 | * can, otherwise we finish off any current ioend and start another. | |
543 | * Return true if we've finished the given ioend. | |
544 | */ | |
545 | STATIC void | |
546 | xfs_add_to_ioend( | |
547 | struct inode *inode, | |
548 | struct buffer_head *bh, | |
7336cea8 | 549 | xfs_off_t offset, |
f6d6d4fc CH |
550 | unsigned int type, |
551 | xfs_ioend_t **result, | |
552 | int need_ioend) | |
553 | { | |
554 | xfs_ioend_t *ioend = *result; | |
555 | ||
556 | if (!ioend || need_ioend || type != ioend->io_type) { | |
557 | xfs_ioend_t *previous = *result; | |
f6d6d4fc | 558 | |
f6d6d4fc CH |
559 | ioend = xfs_alloc_ioend(inode, type); |
560 | ioend->io_offset = offset; | |
561 | ioend->io_buffer_head = bh; | |
562 | ioend->io_buffer_tail = bh; | |
563 | if (previous) | |
564 | previous->io_list = ioend; | |
565 | *result = ioend; | |
566 | } else { | |
567 | ioend->io_buffer_tail->b_private = bh; | |
568 | ioend->io_buffer_tail = bh; | |
569 | } | |
570 | ||
571 | bh->b_private = NULL; | |
572 | ioend->io_size += bh->b_size; | |
573 | } | |
574 | ||
87cbc49c NS |
575 | STATIC void |
576 | xfs_map_buffer( | |
577 | struct buffer_head *bh, | |
578 | xfs_iomap_t *mp, | |
579 | xfs_off_t offset, | |
580 | uint block_bits) | |
581 | { | |
582 | sector_t bn; | |
583 | ||
584 | ASSERT(mp->iomap_bn != IOMAP_DADDR_NULL); | |
585 | ||
586 | bn = (mp->iomap_bn >> (block_bits - BBSHIFT)) + | |
587 | ((offset - mp->iomap_offset) >> block_bits); | |
588 | ||
589 | ASSERT(bn || (mp->iomap_flags & IOMAP_REALTIME)); | |
590 | ||
591 | bh->b_blocknr = bn; | |
592 | set_buffer_mapped(bh); | |
593 | } | |
594 | ||
1da177e4 LT |
595 | STATIC void |
596 | xfs_map_at_offset( | |
1da177e4 | 597 | struct buffer_head *bh, |
1defeac9 | 598 | loff_t offset, |
1da177e4 | 599 | int block_bits, |
1defeac9 | 600 | xfs_iomap_t *iomapp) |
1da177e4 | 601 | { |
1da177e4 LT |
602 | ASSERT(!(iomapp->iomap_flags & IOMAP_HOLE)); |
603 | ASSERT(!(iomapp->iomap_flags & IOMAP_DELAY)); | |
1da177e4 LT |
604 | |
605 | lock_buffer(bh); | |
87cbc49c | 606 | xfs_map_buffer(bh, iomapp, offset, block_bits); |
ce8e922c | 607 | bh->b_bdev = iomapp->iomap_target->bt_bdev; |
1da177e4 LT |
608 | set_buffer_mapped(bh); |
609 | clear_buffer_delay(bh); | |
f6d6d4fc | 610 | clear_buffer_unwritten(bh); |
1da177e4 LT |
611 | } |
612 | ||
613 | /* | |
6c4fe19f | 614 | * Look for a page at index that is suitable for clustering. |
1da177e4 LT |
615 | */ |
616 | STATIC unsigned int | |
6c4fe19f | 617 | xfs_probe_page( |
10ce4444 | 618 | struct page *page, |
6c4fe19f CH |
619 | unsigned int pg_offset, |
620 | int mapped) | |
1da177e4 | 621 | { |
1da177e4 LT |
622 | int ret = 0; |
623 | ||
1da177e4 | 624 | if (PageWriteback(page)) |
10ce4444 | 625 | return 0; |
1da177e4 LT |
626 | |
627 | if (page->mapping && PageDirty(page)) { | |
628 | if (page_has_buffers(page)) { | |
629 | struct buffer_head *bh, *head; | |
630 | ||
631 | bh = head = page_buffers(page); | |
632 | do { | |
6c4fe19f CH |
633 | if (!buffer_uptodate(bh)) |
634 | break; | |
635 | if (mapped != buffer_mapped(bh)) | |
1da177e4 LT |
636 | break; |
637 | ret += bh->b_size; | |
638 | if (ret >= pg_offset) | |
639 | break; | |
640 | } while ((bh = bh->b_this_page) != head); | |
641 | } else | |
6c4fe19f | 642 | ret = mapped ? 0 : PAGE_CACHE_SIZE; |
1da177e4 LT |
643 | } |
644 | ||
1da177e4 LT |
645 | return ret; |
646 | } | |
647 | ||
f6d6d4fc | 648 | STATIC size_t |
6c4fe19f | 649 | xfs_probe_cluster( |
1da177e4 LT |
650 | struct inode *inode, |
651 | struct page *startpage, | |
652 | struct buffer_head *bh, | |
6c4fe19f CH |
653 | struct buffer_head *head, |
654 | int mapped) | |
1da177e4 | 655 | { |
10ce4444 | 656 | struct pagevec pvec; |
1da177e4 | 657 | pgoff_t tindex, tlast, tloff; |
10ce4444 CH |
658 | size_t total = 0; |
659 | int done = 0, i; | |
1da177e4 LT |
660 | |
661 | /* First sum forwards in this page */ | |
662 | do { | |
2353e8e9 | 663 | if (!buffer_uptodate(bh) || (mapped != buffer_mapped(bh))) |
10ce4444 | 664 | return total; |
1da177e4 LT |
665 | total += bh->b_size; |
666 | } while ((bh = bh->b_this_page) != head); | |
667 | ||
10ce4444 CH |
668 | /* if we reached the end of the page, sum forwards in following pages */ |
669 | tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT; | |
670 | tindex = startpage->index + 1; | |
671 | ||
672 | /* Prune this back to avoid pathological behavior */ | |
673 | tloff = min(tlast, startpage->index + 64); | |
674 | ||
675 | pagevec_init(&pvec, 0); | |
676 | while (!done && tindex <= tloff) { | |
677 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
678 | ||
679 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
680 | break; | |
681 | ||
682 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
683 | struct page *page = pvec.pages[i]; | |
265c1fac | 684 | size_t pg_offset, pg_len = 0; |
10ce4444 CH |
685 | |
686 | if (tindex == tlast) { | |
687 | pg_offset = | |
688 | i_size_read(inode) & (PAGE_CACHE_SIZE - 1); | |
1defeac9 CH |
689 | if (!pg_offset) { |
690 | done = 1; | |
10ce4444 | 691 | break; |
1defeac9 | 692 | } |
10ce4444 CH |
693 | } else |
694 | pg_offset = PAGE_CACHE_SIZE; | |
695 | ||
529ae9aa | 696 | if (page->index == tindex && trylock_page(page)) { |
265c1fac | 697 | pg_len = xfs_probe_page(page, pg_offset, mapped); |
10ce4444 CH |
698 | unlock_page(page); |
699 | } | |
700 | ||
265c1fac | 701 | if (!pg_len) { |
10ce4444 CH |
702 | done = 1; |
703 | break; | |
704 | } | |
705 | ||
265c1fac | 706 | total += pg_len; |
1defeac9 | 707 | tindex++; |
1da177e4 | 708 | } |
10ce4444 CH |
709 | |
710 | pagevec_release(&pvec); | |
711 | cond_resched(); | |
1da177e4 | 712 | } |
10ce4444 | 713 | |
1da177e4 LT |
714 | return total; |
715 | } | |
716 | ||
717 | /* | |
10ce4444 CH |
718 | * Test if a given page is suitable for writing as part of an unwritten |
719 | * or delayed allocate extent. | |
1da177e4 | 720 | */ |
10ce4444 CH |
721 | STATIC int |
722 | xfs_is_delayed_page( | |
723 | struct page *page, | |
f6d6d4fc | 724 | unsigned int type) |
1da177e4 | 725 | { |
1da177e4 | 726 | if (PageWriteback(page)) |
10ce4444 | 727 | return 0; |
1da177e4 LT |
728 | |
729 | if (page->mapping && page_has_buffers(page)) { | |
730 | struct buffer_head *bh, *head; | |
731 | int acceptable = 0; | |
732 | ||
733 | bh = head = page_buffers(page); | |
734 | do { | |
f6d6d4fc CH |
735 | if (buffer_unwritten(bh)) |
736 | acceptable = (type == IOMAP_UNWRITTEN); | |
737 | else if (buffer_delay(bh)) | |
738 | acceptable = (type == IOMAP_DELAY); | |
2ddee844 | 739 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
df3c7244 | 740 | acceptable = (type == IOMAP_NEW); |
f6d6d4fc | 741 | else |
1da177e4 | 742 | break; |
1da177e4 LT |
743 | } while ((bh = bh->b_this_page) != head); |
744 | ||
745 | if (acceptable) | |
10ce4444 | 746 | return 1; |
1da177e4 LT |
747 | } |
748 | ||
10ce4444 | 749 | return 0; |
1da177e4 LT |
750 | } |
751 | ||
1da177e4 LT |
752 | /* |
753 | * Allocate & map buffers for page given the extent map. Write it out. | |
754 | * except for the original page of a writepage, this is called on | |
755 | * delalloc/unwritten pages only, for the original page it is possible | |
756 | * that the page has no mapping at all. | |
757 | */ | |
f6d6d4fc | 758 | STATIC int |
1da177e4 LT |
759 | xfs_convert_page( |
760 | struct inode *inode, | |
761 | struct page *page, | |
10ce4444 | 762 | loff_t tindex, |
1defeac9 | 763 | xfs_iomap_t *mp, |
f6d6d4fc | 764 | xfs_ioend_t **ioendp, |
1da177e4 | 765 | struct writeback_control *wbc, |
1da177e4 LT |
766 | int startio, |
767 | int all_bh) | |
768 | { | |
f6d6d4fc | 769 | struct buffer_head *bh, *head; |
9260dc6b CH |
770 | xfs_off_t end_offset; |
771 | unsigned long p_offset; | |
f6d6d4fc | 772 | unsigned int type; |
1da177e4 | 773 | int bbits = inode->i_blkbits; |
24e17b5f | 774 | int len, page_dirty; |
f6d6d4fc | 775 | int count = 0, done = 0, uptodate = 1; |
9260dc6b | 776 | xfs_off_t offset = page_offset(page); |
1da177e4 | 777 | |
10ce4444 CH |
778 | if (page->index != tindex) |
779 | goto fail; | |
529ae9aa | 780 | if (!trylock_page(page)) |
10ce4444 CH |
781 | goto fail; |
782 | if (PageWriteback(page)) | |
783 | goto fail_unlock_page; | |
784 | if (page->mapping != inode->i_mapping) | |
785 | goto fail_unlock_page; | |
786 | if (!xfs_is_delayed_page(page, (*ioendp)->io_type)) | |
787 | goto fail_unlock_page; | |
788 | ||
24e17b5f NS |
789 | /* |
790 | * page_dirty is initially a count of buffers on the page before | |
c41564b5 | 791 | * EOF and is decremented as we move each into a cleanable state. |
9260dc6b CH |
792 | * |
793 | * Derivation: | |
794 | * | |
795 | * End offset is the highest offset that this page should represent. | |
796 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
797 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
798 | * hence give us the correct page_dirty count. On any other page, | |
799 | * it will be zero and in that case we need page_dirty to be the | |
800 | * count of buffers on the page. | |
24e17b5f | 801 | */ |
9260dc6b CH |
802 | end_offset = min_t(unsigned long long, |
803 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, | |
804 | i_size_read(inode)); | |
805 | ||
24e17b5f | 806 | len = 1 << inode->i_blkbits; |
9260dc6b CH |
807 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
808 | PAGE_CACHE_SIZE); | |
809 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
810 | page_dirty = p_offset / len; | |
24e17b5f | 811 | |
1da177e4 LT |
812 | bh = head = page_buffers(page); |
813 | do { | |
9260dc6b | 814 | if (offset >= end_offset) |
1da177e4 | 815 | break; |
f6d6d4fc CH |
816 | if (!buffer_uptodate(bh)) |
817 | uptodate = 0; | |
818 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { | |
819 | done = 1; | |
1da177e4 | 820 | continue; |
f6d6d4fc CH |
821 | } |
822 | ||
9260dc6b CH |
823 | if (buffer_unwritten(bh) || buffer_delay(bh)) { |
824 | if (buffer_unwritten(bh)) | |
825 | type = IOMAP_UNWRITTEN; | |
826 | else | |
827 | type = IOMAP_DELAY; | |
828 | ||
829 | if (!xfs_iomap_valid(mp, offset)) { | |
f6d6d4fc | 830 | done = 1; |
9260dc6b CH |
831 | continue; |
832 | } | |
833 | ||
834 | ASSERT(!(mp->iomap_flags & IOMAP_HOLE)); | |
835 | ASSERT(!(mp->iomap_flags & IOMAP_DELAY)); | |
836 | ||
837 | xfs_map_at_offset(bh, offset, bbits, mp); | |
838 | if (startio) { | |
7336cea8 | 839 | xfs_add_to_ioend(inode, bh, offset, |
9260dc6b CH |
840 | type, ioendp, done); |
841 | } else { | |
842 | set_buffer_dirty(bh); | |
843 | unlock_buffer(bh); | |
844 | mark_buffer_dirty(bh); | |
845 | } | |
846 | page_dirty--; | |
847 | count++; | |
848 | } else { | |
df3c7244 | 849 | type = IOMAP_NEW; |
9260dc6b | 850 | if (buffer_mapped(bh) && all_bh && startio) { |
1da177e4 | 851 | lock_buffer(bh); |
7336cea8 | 852 | xfs_add_to_ioend(inode, bh, offset, |
f6d6d4fc CH |
853 | type, ioendp, done); |
854 | count++; | |
24e17b5f | 855 | page_dirty--; |
9260dc6b CH |
856 | } else { |
857 | done = 1; | |
1da177e4 | 858 | } |
1da177e4 | 859 | } |
7336cea8 | 860 | } while (offset += len, (bh = bh->b_this_page) != head); |
1da177e4 | 861 | |
f6d6d4fc CH |
862 | if (uptodate && bh == head) |
863 | SetPageUptodate(page); | |
864 | ||
865 | if (startio) { | |
f5e596bb | 866 | if (count) { |
9fddaca2 | 867 | wbc->nr_to_write--; |
0d99519e | 868 | if (wbc->nr_to_write <= 0) |
f5e596bb | 869 | done = 1; |
f5e596bb | 870 | } |
b41759cf | 871 | xfs_start_page_writeback(page, !page_dirty, count); |
1da177e4 | 872 | } |
f6d6d4fc CH |
873 | |
874 | return done; | |
10ce4444 CH |
875 | fail_unlock_page: |
876 | unlock_page(page); | |
877 | fail: | |
878 | return 1; | |
1da177e4 LT |
879 | } |
880 | ||
881 | /* | |
882 | * Convert & write out a cluster of pages in the same extent as defined | |
883 | * by mp and following the start page. | |
884 | */ | |
885 | STATIC void | |
886 | xfs_cluster_write( | |
887 | struct inode *inode, | |
888 | pgoff_t tindex, | |
889 | xfs_iomap_t *iomapp, | |
f6d6d4fc | 890 | xfs_ioend_t **ioendp, |
1da177e4 LT |
891 | struct writeback_control *wbc, |
892 | int startio, | |
893 | int all_bh, | |
894 | pgoff_t tlast) | |
895 | { | |
10ce4444 CH |
896 | struct pagevec pvec; |
897 | int done = 0, i; | |
1da177e4 | 898 | |
10ce4444 CH |
899 | pagevec_init(&pvec, 0); |
900 | while (!done && tindex <= tlast) { | |
901 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
902 | ||
903 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
1da177e4 | 904 | break; |
10ce4444 CH |
905 | |
906 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
907 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, | |
908 | iomapp, ioendp, wbc, startio, all_bh); | |
909 | if (done) | |
910 | break; | |
911 | } | |
912 | ||
913 | pagevec_release(&pvec); | |
914 | cond_resched(); | |
1da177e4 LT |
915 | } |
916 | } | |
917 | ||
918 | /* | |
919 | * Calling this without startio set means we are being asked to make a dirty | |
920 | * page ready for freeing it's buffers. When called with startio set then | |
921 | * we are coming from writepage. | |
922 | * | |
923 | * When called with startio set it is important that we write the WHOLE | |
924 | * page if possible. | |
925 | * The bh->b_state's cannot know if any of the blocks or which block for | |
926 | * that matter are dirty due to mmap writes, and therefore bh uptodate is | |
c41564b5 | 927 | * only valid if the page itself isn't completely uptodate. Some layers |
1da177e4 LT |
928 | * may clear the page dirty flag prior to calling write page, under the |
929 | * assumption the entire page will be written out; by not writing out the | |
930 | * whole page the page can be reused before all valid dirty data is | |
931 | * written out. Note: in the case of a page that has been dirty'd by | |
932 | * mapwrite and but partially setup by block_prepare_write the | |
933 | * bh->b_states's will not agree and only ones setup by BPW/BCW will have | |
934 | * valid state, thus the whole page must be written out thing. | |
935 | */ | |
936 | ||
937 | STATIC int | |
938 | xfs_page_state_convert( | |
939 | struct inode *inode, | |
940 | struct page *page, | |
941 | struct writeback_control *wbc, | |
942 | int startio, | |
943 | int unmapped) /* also implies page uptodate */ | |
944 | { | |
f6d6d4fc | 945 | struct buffer_head *bh, *head; |
1defeac9 | 946 | xfs_iomap_t iomap; |
f6d6d4fc | 947 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
1da177e4 LT |
948 | loff_t offset; |
949 | unsigned long p_offset = 0; | |
f6d6d4fc | 950 | unsigned int type; |
1da177e4 LT |
951 | __uint64_t end_offset; |
952 | pgoff_t end_index, last_index, tlast; | |
d5cb48aa CH |
953 | ssize_t size, len; |
954 | int flags, err, iomap_valid = 0, uptodate = 1; | |
8272145c NS |
955 | int page_dirty, count = 0; |
956 | int trylock = 0; | |
6c4fe19f | 957 | int all_bh = unmapped; |
1da177e4 | 958 | |
8272145c NS |
959 | if (startio) { |
960 | if (wbc->sync_mode == WB_SYNC_NONE && wbc->nonblocking) | |
961 | trylock |= BMAPI_TRYLOCK; | |
962 | } | |
3ba0815a | 963 | |
1da177e4 LT |
964 | /* Is this page beyond the end of the file? */ |
965 | offset = i_size_read(inode); | |
966 | end_index = offset >> PAGE_CACHE_SHIFT; | |
967 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; | |
968 | if (page->index >= end_index) { | |
969 | if ((page->index >= end_index + 1) || | |
970 | !(i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) { | |
19d5bcf3 NS |
971 | if (startio) |
972 | unlock_page(page); | |
973 | return 0; | |
1da177e4 LT |
974 | } |
975 | } | |
976 | ||
1da177e4 | 977 | /* |
24e17b5f | 978 | * page_dirty is initially a count of buffers on the page before |
c41564b5 | 979 | * EOF and is decremented as we move each into a cleanable state. |
f6d6d4fc CH |
980 | * |
981 | * Derivation: | |
982 | * | |
983 | * End offset is the highest offset that this page should represent. | |
984 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
985 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
986 | * hence give us the correct page_dirty count. On any other page, | |
987 | * it will be zero and in that case we need page_dirty to be the | |
988 | * count of buffers on the page. | |
989 | */ | |
990 | end_offset = min_t(unsigned long long, | |
991 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, offset); | |
24e17b5f | 992 | len = 1 << inode->i_blkbits; |
f6d6d4fc CH |
993 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
994 | PAGE_CACHE_SIZE); | |
995 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
24e17b5f NS |
996 | page_dirty = p_offset / len; |
997 | ||
24e17b5f | 998 | bh = head = page_buffers(page); |
f6d6d4fc | 999 | offset = page_offset(page); |
df3c7244 DC |
1000 | flags = BMAPI_READ; |
1001 | type = IOMAP_NEW; | |
f6d6d4fc | 1002 | |
f6d6d4fc | 1003 | /* TODO: cleanup count and page_dirty */ |
1da177e4 LT |
1004 | |
1005 | do { | |
1006 | if (offset >= end_offset) | |
1007 | break; | |
1008 | if (!buffer_uptodate(bh)) | |
1009 | uptodate = 0; | |
f6d6d4fc | 1010 | if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio) { |
1defeac9 CH |
1011 | /* |
1012 | * the iomap is actually still valid, but the ioend | |
1013 | * isn't. shouldn't happen too often. | |
1014 | */ | |
1015 | iomap_valid = 0; | |
1da177e4 | 1016 | continue; |
f6d6d4fc | 1017 | } |
1da177e4 | 1018 | |
1defeac9 CH |
1019 | if (iomap_valid) |
1020 | iomap_valid = xfs_iomap_valid(&iomap, offset); | |
1da177e4 LT |
1021 | |
1022 | /* | |
1023 | * First case, map an unwritten extent and prepare for | |
1024 | * extent state conversion transaction on completion. | |
f6d6d4fc | 1025 | * |
1da177e4 LT |
1026 | * Second case, allocate space for a delalloc buffer. |
1027 | * We can return EAGAIN here in the release page case. | |
d5cb48aa CH |
1028 | * |
1029 | * Third case, an unmapped buffer was found, and we are | |
1030 | * in a path where we need to write the whole page out. | |
df3c7244 | 1031 | */ |
d5cb48aa CH |
1032 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
1033 | ((buffer_uptodate(bh) || PageUptodate(page)) && | |
1034 | !buffer_mapped(bh) && (unmapped || startio))) { | |
effd120e DC |
1035 | int new_ioend = 0; |
1036 | ||
df3c7244 | 1037 | /* |
6c4fe19f CH |
1038 | * Make sure we don't use a read-only iomap |
1039 | */ | |
df3c7244 | 1040 | if (flags == BMAPI_READ) |
6c4fe19f CH |
1041 | iomap_valid = 0; |
1042 | ||
f6d6d4fc CH |
1043 | if (buffer_unwritten(bh)) { |
1044 | type = IOMAP_UNWRITTEN; | |
8272145c | 1045 | flags = BMAPI_WRITE | BMAPI_IGNSTATE; |
d5cb48aa | 1046 | } else if (buffer_delay(bh)) { |
f6d6d4fc | 1047 | type = IOMAP_DELAY; |
8272145c | 1048 | flags = BMAPI_ALLOCATE | trylock; |
d5cb48aa | 1049 | } else { |
6c4fe19f | 1050 | type = IOMAP_NEW; |
8272145c | 1051 | flags = BMAPI_WRITE | BMAPI_MMAP; |
f6d6d4fc CH |
1052 | } |
1053 | ||
1defeac9 | 1054 | if (!iomap_valid) { |
effd120e DC |
1055 | /* |
1056 | * if we didn't have a valid mapping then we | |
1057 | * need to ensure that we put the new mapping | |
1058 | * in a new ioend structure. This needs to be | |
1059 | * done to ensure that the ioends correctly | |
1060 | * reflect the block mappings at io completion | |
1061 | * for unwritten extent conversion. | |
1062 | */ | |
1063 | new_ioend = 1; | |
6c4fe19f CH |
1064 | if (type == IOMAP_NEW) { |
1065 | size = xfs_probe_cluster(inode, | |
1066 | page, bh, head, 0); | |
d5cb48aa CH |
1067 | } else { |
1068 | size = len; | |
1069 | } | |
1070 | ||
1071 | err = xfs_map_blocks(inode, offset, size, | |
1072 | &iomap, flags); | |
f6d6d4fc | 1073 | if (err) |
1da177e4 | 1074 | goto error; |
1defeac9 | 1075 | iomap_valid = xfs_iomap_valid(&iomap, offset); |
1da177e4 | 1076 | } |
1defeac9 CH |
1077 | if (iomap_valid) { |
1078 | xfs_map_at_offset(bh, offset, | |
1079 | inode->i_blkbits, &iomap); | |
1da177e4 | 1080 | if (startio) { |
7336cea8 | 1081 | xfs_add_to_ioend(inode, bh, offset, |
1defeac9 | 1082 | type, &ioend, |
effd120e | 1083 | new_ioend); |
1da177e4 LT |
1084 | } else { |
1085 | set_buffer_dirty(bh); | |
1086 | unlock_buffer(bh); | |
1087 | mark_buffer_dirty(bh); | |
1088 | } | |
1089 | page_dirty--; | |
f6d6d4fc | 1090 | count++; |
1da177e4 | 1091 | } |
d5cb48aa | 1092 | } else if (buffer_uptodate(bh) && startio) { |
6c4fe19f CH |
1093 | /* |
1094 | * we got here because the buffer is already mapped. | |
1095 | * That means it must already have extents allocated | |
1096 | * underneath it. Map the extent by reading it. | |
1097 | */ | |
df3c7244 | 1098 | if (!iomap_valid || flags != BMAPI_READ) { |
6c4fe19f CH |
1099 | flags = BMAPI_READ; |
1100 | size = xfs_probe_cluster(inode, page, bh, | |
1101 | head, 1); | |
1102 | err = xfs_map_blocks(inode, offset, size, | |
1103 | &iomap, flags); | |
1104 | if (err) | |
1105 | goto error; | |
1106 | iomap_valid = xfs_iomap_valid(&iomap, offset); | |
1107 | } | |
d5cb48aa | 1108 | |
df3c7244 DC |
1109 | /* |
1110 | * We set the type to IOMAP_NEW in case we are doing a | |
1111 | * small write at EOF that is extending the file but | |
1112 | * without needing an allocation. We need to update the | |
1113 | * file size on I/O completion in this case so it is | |
1114 | * the same case as having just allocated a new extent | |
1115 | * that we are writing into for the first time. | |
1116 | */ | |
1117 | type = IOMAP_NEW; | |
ca5de404 | 1118 | if (trylock_buffer(bh)) { |
d5cb48aa | 1119 | ASSERT(buffer_mapped(bh)); |
6c4fe19f CH |
1120 | if (iomap_valid) |
1121 | all_bh = 1; | |
7336cea8 | 1122 | xfs_add_to_ioend(inode, bh, offset, type, |
d5cb48aa CH |
1123 | &ioend, !iomap_valid); |
1124 | page_dirty--; | |
1125 | count++; | |
f6d6d4fc | 1126 | } else { |
1defeac9 | 1127 | iomap_valid = 0; |
1da177e4 | 1128 | } |
d5cb48aa CH |
1129 | } else if ((buffer_uptodate(bh) || PageUptodate(page)) && |
1130 | (unmapped || startio)) { | |
1131 | iomap_valid = 0; | |
1da177e4 | 1132 | } |
f6d6d4fc CH |
1133 | |
1134 | if (!iohead) | |
1135 | iohead = ioend; | |
1136 | ||
1137 | } while (offset += len, ((bh = bh->b_this_page) != head)); | |
1da177e4 LT |
1138 | |
1139 | if (uptodate && bh == head) | |
1140 | SetPageUptodate(page); | |
1141 | ||
f6d6d4fc | 1142 | if (startio) |
b41759cf | 1143 | xfs_start_page_writeback(page, 1, count); |
1da177e4 | 1144 | |
1defeac9 CH |
1145 | if (ioend && iomap_valid) { |
1146 | offset = (iomap.iomap_offset + iomap.iomap_bsize - 1) >> | |
1da177e4 | 1147 | PAGE_CACHE_SHIFT; |
775bf6c9 | 1148 | tlast = min_t(pgoff_t, offset, last_index); |
1defeac9 | 1149 | xfs_cluster_write(inode, page->index + 1, &iomap, &ioend, |
6c4fe19f | 1150 | wbc, startio, all_bh, tlast); |
1da177e4 LT |
1151 | } |
1152 | ||
f6d6d4fc | 1153 | if (iohead) |
06342cf8 | 1154 | xfs_submit_ioend(wbc, iohead); |
f6d6d4fc | 1155 | |
1da177e4 LT |
1156 | return page_dirty; |
1157 | ||
1158 | error: | |
f6d6d4fc CH |
1159 | if (iohead) |
1160 | xfs_cancel_ioend(iohead); | |
1da177e4 LT |
1161 | |
1162 | /* | |
1163 | * If it's delalloc and we have nowhere to put it, | |
1164 | * throw it away, unless the lower layers told | |
1165 | * us to try again. | |
1166 | */ | |
1167 | if (err != -EAGAIN) { | |
f6d6d4fc | 1168 | if (!unmapped) |
1da177e4 | 1169 | block_invalidatepage(page, 0); |
1da177e4 LT |
1170 | ClearPageUptodate(page); |
1171 | } | |
1172 | return err; | |
1173 | } | |
1174 | ||
f51623b2 NS |
1175 | /* |
1176 | * writepage: Called from one of two places: | |
1177 | * | |
1178 | * 1. we are flushing a delalloc buffer head. | |
1179 | * | |
1180 | * 2. we are writing out a dirty page. Typically the page dirty | |
1181 | * state is cleared before we get here. In this case is it | |
1182 | * conceivable we have no buffer heads. | |
1183 | * | |
1184 | * For delalloc space on the page we need to allocate space and | |
1185 | * flush it. For unmapped buffer heads on the page we should | |
1186 | * allocate space if the page is uptodate. For any other dirty | |
1187 | * buffer heads on the page we should flush them. | |
1188 | * | |
1189 | * If we detect that a transaction would be required to flush | |
1190 | * the page, we have to check the process flags first, if we | |
1191 | * are already in a transaction or disk I/O during allocations | |
1192 | * is off, we need to fail the writepage and redirty the page. | |
1193 | */ | |
1194 | ||
1195 | STATIC int | |
e4c573bb | 1196 | xfs_vm_writepage( |
f51623b2 NS |
1197 | struct page *page, |
1198 | struct writeback_control *wbc) | |
1199 | { | |
1200 | int error; | |
1201 | int need_trans; | |
1202 | int delalloc, unmapped, unwritten; | |
1203 | struct inode *inode = page->mapping->host; | |
1204 | ||
1205 | xfs_page_trace(XFS_WRITEPAGE_ENTER, inode, page, 0); | |
1206 | ||
1207 | /* | |
1208 | * We need a transaction if: | |
1209 | * 1. There are delalloc buffers on the page | |
1210 | * 2. The page is uptodate and we have unmapped buffers | |
1211 | * 3. The page is uptodate and we have no buffers | |
1212 | * 4. There are unwritten buffers on the page | |
1213 | */ | |
1214 | ||
1215 | if (!page_has_buffers(page)) { | |
1216 | unmapped = 1; | |
1217 | need_trans = 1; | |
1218 | } else { | |
1219 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); | |
1220 | if (!PageUptodate(page)) | |
1221 | unmapped = 0; | |
1222 | need_trans = delalloc + unmapped + unwritten; | |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * If we need a transaction and the process flags say | |
1227 | * we are already in a transaction, or no IO is allowed | |
1228 | * then mark the page dirty again and leave the page | |
1229 | * as is. | |
1230 | */ | |
59c1b082 | 1231 | if (current_test_flags(PF_FSTRANS) && need_trans) |
f51623b2 NS |
1232 | goto out_fail; |
1233 | ||
1234 | /* | |
1235 | * Delay hooking up buffer heads until we have | |
1236 | * made our go/no-go decision. | |
1237 | */ | |
1238 | if (!page_has_buffers(page)) | |
1239 | create_empty_buffers(page, 1 << inode->i_blkbits, 0); | |
1240 | ||
c8a4051c ES |
1241 | |
1242 | /* | |
1243 | * VM calculation for nr_to_write seems off. Bump it way | |
1244 | * up, this gets simple streaming writes zippy again. | |
1245 | * To be reviewed again after Jens' writeback changes. | |
1246 | */ | |
1247 | wbc->nr_to_write *= 4; | |
1248 | ||
f51623b2 NS |
1249 | /* |
1250 | * Convert delayed allocate, unwritten or unmapped space | |
1251 | * to real space and flush out to disk. | |
1252 | */ | |
1253 | error = xfs_page_state_convert(inode, page, wbc, 1, unmapped); | |
1254 | if (error == -EAGAIN) | |
1255 | goto out_fail; | |
1256 | if (unlikely(error < 0)) | |
1257 | goto out_unlock; | |
1258 | ||
1259 | return 0; | |
1260 | ||
1261 | out_fail: | |
1262 | redirty_page_for_writepage(wbc, page); | |
1263 | unlock_page(page); | |
1264 | return 0; | |
1265 | out_unlock: | |
1266 | unlock_page(page); | |
1267 | return error; | |
1268 | } | |
1269 | ||
7d4fb40a NS |
1270 | STATIC int |
1271 | xfs_vm_writepages( | |
1272 | struct address_space *mapping, | |
1273 | struct writeback_control *wbc) | |
1274 | { | |
b3aea4ed | 1275 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
7d4fb40a NS |
1276 | return generic_writepages(mapping, wbc); |
1277 | } | |
1278 | ||
f51623b2 NS |
1279 | /* |
1280 | * Called to move a page into cleanable state - and from there | |
1281 | * to be released. Possibly the page is already clean. We always | |
1282 | * have buffer heads in this call. | |
1283 | * | |
1284 | * Returns 0 if the page is ok to release, 1 otherwise. | |
1285 | * | |
1286 | * Possible scenarios are: | |
1287 | * | |
1288 | * 1. We are being called to release a page which has been written | |
1289 | * to via regular I/O. buffer heads will be dirty and possibly | |
1290 | * delalloc. If no delalloc buffer heads in this case then we | |
1291 | * can just return zero. | |
1292 | * | |
1293 | * 2. We are called to release a page which has been written via | |
1294 | * mmap, all we need to do is ensure there is no delalloc | |
1295 | * state in the buffer heads, if not we can let the caller | |
1296 | * free them and we should come back later via writepage. | |
1297 | */ | |
1298 | STATIC int | |
238f4c54 | 1299 | xfs_vm_releasepage( |
f51623b2 NS |
1300 | struct page *page, |
1301 | gfp_t gfp_mask) | |
1302 | { | |
1303 | struct inode *inode = page->mapping->host; | |
1304 | int dirty, delalloc, unmapped, unwritten; | |
1305 | struct writeback_control wbc = { | |
1306 | .sync_mode = WB_SYNC_ALL, | |
1307 | .nr_to_write = 1, | |
1308 | }; | |
1309 | ||
ed9d88f7 | 1310 | xfs_page_trace(XFS_RELEASEPAGE_ENTER, inode, page, 0); |
f51623b2 | 1311 | |
238f4c54 NS |
1312 | if (!page_has_buffers(page)) |
1313 | return 0; | |
1314 | ||
f51623b2 NS |
1315 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); |
1316 | if (!delalloc && !unwritten) | |
1317 | goto free_buffers; | |
1318 | ||
1319 | if (!(gfp_mask & __GFP_FS)) | |
1320 | return 0; | |
1321 | ||
1322 | /* If we are already inside a transaction or the thread cannot | |
1323 | * do I/O, we cannot release this page. | |
1324 | */ | |
59c1b082 | 1325 | if (current_test_flags(PF_FSTRANS)) |
f51623b2 NS |
1326 | return 0; |
1327 | ||
1328 | /* | |
1329 | * Convert delalloc space to real space, do not flush the | |
1330 | * data out to disk, that will be done by the caller. | |
1331 | * Never need to allocate space here - we will always | |
1332 | * come back to writepage in that case. | |
1333 | */ | |
1334 | dirty = xfs_page_state_convert(inode, page, &wbc, 0, 0); | |
1335 | if (dirty == 0 && !unwritten) | |
1336 | goto free_buffers; | |
1337 | return 0; | |
1338 | ||
1339 | free_buffers: | |
1340 | return try_to_free_buffers(page); | |
1341 | } | |
1342 | ||
1da177e4 | 1343 | STATIC int |
c2536668 | 1344 | __xfs_get_blocks( |
1da177e4 LT |
1345 | struct inode *inode, |
1346 | sector_t iblock, | |
1da177e4 LT |
1347 | struct buffer_head *bh_result, |
1348 | int create, | |
1349 | int direct, | |
1350 | bmapi_flags_t flags) | |
1351 | { | |
1da177e4 | 1352 | xfs_iomap_t iomap; |
fdc7ed75 NS |
1353 | xfs_off_t offset; |
1354 | ssize_t size; | |
c2536668 | 1355 | int niomap = 1; |
1da177e4 | 1356 | int error; |
1da177e4 | 1357 | |
fdc7ed75 | 1358 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
c2536668 NS |
1359 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
1360 | size = bh_result->b_size; | |
364f358a LM |
1361 | |
1362 | if (!create && direct && offset >= i_size_read(inode)) | |
1363 | return 0; | |
1364 | ||
541d7d3c | 1365 | error = xfs_iomap(XFS_I(inode), offset, size, |
67fcaa73 | 1366 | create ? flags : BMAPI_READ, &iomap, &niomap); |
1da177e4 LT |
1367 | if (error) |
1368 | return -error; | |
c2536668 | 1369 | if (niomap == 0) |
1da177e4 LT |
1370 | return 0; |
1371 | ||
1372 | if (iomap.iomap_bn != IOMAP_DADDR_NULL) { | |
87cbc49c NS |
1373 | /* |
1374 | * For unwritten extents do not report a disk address on | |
1da177e4 LT |
1375 | * the read case (treat as if we're reading into a hole). |
1376 | */ | |
1377 | if (create || !(iomap.iomap_flags & IOMAP_UNWRITTEN)) { | |
87cbc49c NS |
1378 | xfs_map_buffer(bh_result, &iomap, offset, |
1379 | inode->i_blkbits); | |
1da177e4 LT |
1380 | } |
1381 | if (create && (iomap.iomap_flags & IOMAP_UNWRITTEN)) { | |
1382 | if (direct) | |
1383 | bh_result->b_private = inode; | |
1384 | set_buffer_unwritten(bh_result); | |
1da177e4 LT |
1385 | } |
1386 | } | |
1387 | ||
c2536668 NS |
1388 | /* |
1389 | * If this is a realtime file, data may be on a different device. | |
1390 | * to that pointed to from the buffer_head b_bdev currently. | |
1391 | */ | |
ce8e922c | 1392 | bh_result->b_bdev = iomap.iomap_target->bt_bdev; |
1da177e4 | 1393 | |
c2536668 | 1394 | /* |
549054af DC |
1395 | * If we previously allocated a block out beyond eof and we are now |
1396 | * coming back to use it then we will need to flag it as new even if it | |
1397 | * has a disk address. | |
1398 | * | |
1399 | * With sub-block writes into unwritten extents we also need to mark | |
1400 | * the buffer as new so that the unwritten parts of the buffer gets | |
1401 | * correctly zeroed. | |
1da177e4 LT |
1402 | */ |
1403 | if (create && | |
1404 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || | |
549054af DC |
1405 | (offset >= i_size_read(inode)) || |
1406 | (iomap.iomap_flags & (IOMAP_NEW|IOMAP_UNWRITTEN)))) | |
1da177e4 | 1407 | set_buffer_new(bh_result); |
1da177e4 LT |
1408 | |
1409 | if (iomap.iomap_flags & IOMAP_DELAY) { | |
1410 | BUG_ON(direct); | |
1411 | if (create) { | |
1412 | set_buffer_uptodate(bh_result); | |
1413 | set_buffer_mapped(bh_result); | |
1414 | set_buffer_delay(bh_result); | |
1415 | } | |
1416 | } | |
1417 | ||
c2536668 | 1418 | if (direct || size > (1 << inode->i_blkbits)) { |
fdc7ed75 NS |
1419 | ASSERT(iomap.iomap_bsize - iomap.iomap_delta > 0); |
1420 | offset = min_t(xfs_off_t, | |
c2536668 NS |
1421 | iomap.iomap_bsize - iomap.iomap_delta, size); |
1422 | bh_result->b_size = (ssize_t)min_t(xfs_off_t, LONG_MAX, offset); | |
1da177e4 LT |
1423 | } |
1424 | ||
1425 | return 0; | |
1426 | } | |
1427 | ||
1428 | int | |
c2536668 | 1429 | xfs_get_blocks( |
1da177e4 LT |
1430 | struct inode *inode, |
1431 | sector_t iblock, | |
1432 | struct buffer_head *bh_result, | |
1433 | int create) | |
1434 | { | |
c2536668 | 1435 | return __xfs_get_blocks(inode, iblock, |
fa30bd05 | 1436 | bh_result, create, 0, BMAPI_WRITE); |
1da177e4 LT |
1437 | } |
1438 | ||
1439 | STATIC int | |
e4c573bb | 1440 | xfs_get_blocks_direct( |
1da177e4 LT |
1441 | struct inode *inode, |
1442 | sector_t iblock, | |
1da177e4 LT |
1443 | struct buffer_head *bh_result, |
1444 | int create) | |
1445 | { | |
c2536668 | 1446 | return __xfs_get_blocks(inode, iblock, |
1d8fa7a2 | 1447 | bh_result, create, 1, BMAPI_WRITE|BMAPI_DIRECT); |
1da177e4 LT |
1448 | } |
1449 | ||
f0973863 | 1450 | STATIC void |
e4c573bb | 1451 | xfs_end_io_direct( |
f0973863 CH |
1452 | struct kiocb *iocb, |
1453 | loff_t offset, | |
1454 | ssize_t size, | |
1455 | void *private) | |
1456 | { | |
1457 | xfs_ioend_t *ioend = iocb->private; | |
1458 | ||
1459 | /* | |
1460 | * Non-NULL private data means we need to issue a transaction to | |
1461 | * convert a range from unwritten to written extents. This needs | |
c41564b5 | 1462 | * to happen from process context but aio+dio I/O completion |
f0973863 | 1463 | * happens from irq context so we need to defer it to a workqueue. |
c41564b5 | 1464 | * This is not necessary for synchronous direct I/O, but we do |
f0973863 CH |
1465 | * it anyway to keep the code uniform and simpler. |
1466 | * | |
e927af90 DC |
1467 | * Well, if only it were that simple. Because synchronous direct I/O |
1468 | * requires extent conversion to occur *before* we return to userspace, | |
1469 | * we have to wait for extent conversion to complete. Look at the | |
1470 | * iocb that has been passed to us to determine if this is AIO or | |
1471 | * not. If it is synchronous, tell xfs_finish_ioend() to kick the | |
1472 | * workqueue and wait for it to complete. | |
1473 | * | |
f0973863 CH |
1474 | * The core direct I/O code might be changed to always call the |
1475 | * completion handler in the future, in which case all this can | |
1476 | * go away. | |
1477 | */ | |
ba87ea69 LM |
1478 | ioend->io_offset = offset; |
1479 | ioend->io_size = size; | |
1480 | if (ioend->io_type == IOMAP_READ) { | |
e927af90 | 1481 | xfs_finish_ioend(ioend, 0); |
ba87ea69 | 1482 | } else if (private && size > 0) { |
e927af90 | 1483 | xfs_finish_ioend(ioend, is_sync_kiocb(iocb)); |
f0973863 | 1484 | } else { |
ba87ea69 LM |
1485 | /* |
1486 | * A direct I/O write ioend starts it's life in unwritten | |
1487 | * state in case they map an unwritten extent. This write | |
1488 | * didn't map an unwritten extent so switch it's completion | |
1489 | * handler. | |
1490 | */ | |
5ec4fabb | 1491 | ioend->io_type = IOMAP_NEW; |
e927af90 | 1492 | xfs_finish_ioend(ioend, 0); |
f0973863 CH |
1493 | } |
1494 | ||
1495 | /* | |
c41564b5 | 1496 | * blockdev_direct_IO can return an error even after the I/O |
f0973863 CH |
1497 | * completion handler was called. Thus we need to protect |
1498 | * against double-freeing. | |
1499 | */ | |
1500 | iocb->private = NULL; | |
1501 | } | |
1502 | ||
1da177e4 | 1503 | STATIC ssize_t |
e4c573bb | 1504 | xfs_vm_direct_IO( |
1da177e4 LT |
1505 | int rw, |
1506 | struct kiocb *iocb, | |
1507 | const struct iovec *iov, | |
1508 | loff_t offset, | |
1509 | unsigned long nr_segs) | |
1510 | { | |
1511 | struct file *file = iocb->ki_filp; | |
1512 | struct inode *inode = file->f_mapping->host; | |
6214ed44 | 1513 | struct block_device *bdev; |
f0973863 | 1514 | ssize_t ret; |
1da177e4 | 1515 | |
6214ed44 | 1516 | bdev = xfs_find_bdev_for_inode(XFS_I(inode)); |
1da177e4 | 1517 | |
721259bc | 1518 | if (rw == WRITE) { |
ba87ea69 | 1519 | iocb->private = xfs_alloc_ioend(inode, IOMAP_UNWRITTEN); |
721259bc | 1520 | ret = blockdev_direct_IO_own_locking(rw, iocb, inode, |
6214ed44 | 1521 | bdev, iov, offset, nr_segs, |
721259bc LM |
1522 | xfs_get_blocks_direct, |
1523 | xfs_end_io_direct); | |
1524 | } else { | |
ba87ea69 | 1525 | iocb->private = xfs_alloc_ioend(inode, IOMAP_READ); |
721259bc | 1526 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
6214ed44 | 1527 | bdev, iov, offset, nr_segs, |
721259bc LM |
1528 | xfs_get_blocks_direct, |
1529 | xfs_end_io_direct); | |
1530 | } | |
f0973863 | 1531 | |
8459d86a | 1532 | if (unlikely(ret != -EIOCBQUEUED && iocb->private)) |
f0973863 CH |
1533 | xfs_destroy_ioend(iocb->private); |
1534 | return ret; | |
1da177e4 LT |
1535 | } |
1536 | ||
f51623b2 | 1537 | STATIC int |
d79689c7 | 1538 | xfs_vm_write_begin( |
f51623b2 | 1539 | struct file *file, |
d79689c7 NP |
1540 | struct address_space *mapping, |
1541 | loff_t pos, | |
1542 | unsigned len, | |
1543 | unsigned flags, | |
1544 | struct page **pagep, | |
1545 | void **fsdata) | |
f51623b2 | 1546 | { |
d79689c7 NP |
1547 | *pagep = NULL; |
1548 | return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata, | |
1549 | xfs_get_blocks); | |
f51623b2 | 1550 | } |
1da177e4 LT |
1551 | |
1552 | STATIC sector_t | |
e4c573bb | 1553 | xfs_vm_bmap( |
1da177e4 LT |
1554 | struct address_space *mapping, |
1555 | sector_t block) | |
1556 | { | |
1557 | struct inode *inode = (struct inode *)mapping->host; | |
739bfb2a | 1558 | struct xfs_inode *ip = XFS_I(inode); |
1da177e4 | 1559 | |
cf441eeb | 1560 | xfs_itrace_entry(XFS_I(inode)); |
126468b1 | 1561 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
739bfb2a | 1562 | xfs_flush_pages(ip, (xfs_off_t)0, -1, 0, FI_REMAPF); |
126468b1 | 1563 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
c2536668 | 1564 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
1da177e4 LT |
1565 | } |
1566 | ||
1567 | STATIC int | |
e4c573bb | 1568 | xfs_vm_readpage( |
1da177e4 LT |
1569 | struct file *unused, |
1570 | struct page *page) | |
1571 | { | |
c2536668 | 1572 | return mpage_readpage(page, xfs_get_blocks); |
1da177e4 LT |
1573 | } |
1574 | ||
1575 | STATIC int | |
e4c573bb | 1576 | xfs_vm_readpages( |
1da177e4 LT |
1577 | struct file *unused, |
1578 | struct address_space *mapping, | |
1579 | struct list_head *pages, | |
1580 | unsigned nr_pages) | |
1581 | { | |
c2536668 | 1582 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
1da177e4 LT |
1583 | } |
1584 | ||
2ff28e22 | 1585 | STATIC void |
238f4c54 | 1586 | xfs_vm_invalidatepage( |
bcec2b7f NS |
1587 | struct page *page, |
1588 | unsigned long offset) | |
1589 | { | |
1590 | xfs_page_trace(XFS_INVALIDPAGE_ENTER, | |
1591 | page->mapping->host, page, offset); | |
2ff28e22 | 1592 | block_invalidatepage(page, offset); |
bcec2b7f NS |
1593 | } |
1594 | ||
f5e54d6e | 1595 | const struct address_space_operations xfs_address_space_operations = { |
e4c573bb NS |
1596 | .readpage = xfs_vm_readpage, |
1597 | .readpages = xfs_vm_readpages, | |
1598 | .writepage = xfs_vm_writepage, | |
7d4fb40a | 1599 | .writepages = xfs_vm_writepages, |
1da177e4 | 1600 | .sync_page = block_sync_page, |
238f4c54 NS |
1601 | .releasepage = xfs_vm_releasepage, |
1602 | .invalidatepage = xfs_vm_invalidatepage, | |
d79689c7 NP |
1603 | .write_begin = xfs_vm_write_begin, |
1604 | .write_end = generic_write_end, | |
e4c573bb NS |
1605 | .bmap = xfs_vm_bmap, |
1606 | .direct_IO = xfs_vm_direct_IO, | |
e965f963 | 1607 | .migratepage = buffer_migrate_page, |
bddaafa1 | 1608 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1609 | .error_remove_page = generic_error_remove_page, |
1da177e4 | 1610 | }; |