]>
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" | |
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 | ||
f51623b2 NS |
45 | STATIC void |
46 | xfs_count_page_state( | |
47 | struct page *page, | |
48 | int *delalloc, | |
49 | int *unmapped, | |
50 | int *unwritten) | |
51 | { | |
52 | struct buffer_head *bh, *head; | |
53 | ||
54 | *delalloc = *unmapped = *unwritten = 0; | |
55 | ||
56 | bh = head = page_buffers(page); | |
57 | do { | |
58 | if (buffer_uptodate(bh) && !buffer_mapped(bh)) | |
59 | (*unmapped) = 1; | |
f51623b2 NS |
60 | else if (buffer_unwritten(bh)) |
61 | (*unwritten) = 1; | |
62 | else if (buffer_delay(bh)) | |
63 | (*delalloc) = 1; | |
64 | } while ((bh = bh->b_this_page) != head); | |
65 | } | |
66 | ||
1da177e4 LT |
67 | #if defined(XFS_RW_TRACE) |
68 | void | |
69 | xfs_page_trace( | |
70 | int tag, | |
71 | struct inode *inode, | |
72 | struct page *page, | |
ed9d88f7 | 73 | unsigned long pgoff) |
1da177e4 LT |
74 | { |
75 | xfs_inode_t *ip; | |
67fcaa73 | 76 | bhv_vnode_t *vp = vn_from_inode(inode); |
1da177e4 | 77 | loff_t isize = i_size_read(inode); |
f6d6d4fc | 78 | loff_t offset = page_offset(page); |
1da177e4 LT |
79 | int delalloc = -1, unmapped = -1, unwritten = -1; |
80 | ||
81 | if (page_has_buffers(page)) | |
82 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); | |
83 | ||
75e17b3c | 84 | ip = xfs_vtoi(vp); |
1da177e4 LT |
85 | if (!ip->i_rwtrace) |
86 | return; | |
87 | ||
88 | ktrace_enter(ip->i_rwtrace, | |
89 | (void *)((unsigned long)tag), | |
90 | (void *)ip, | |
91 | (void *)inode, | |
92 | (void *)page, | |
ed9d88f7 | 93 | (void *)pgoff, |
1da177e4 LT |
94 | (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), |
95 | (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), | |
96 | (void *)((unsigned long)((isize >> 32) & 0xffffffff)), | |
97 | (void *)((unsigned long)(isize & 0xffffffff)), | |
98 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
99 | (void *)((unsigned long)(offset & 0xffffffff)), | |
100 | (void *)((unsigned long)delalloc), | |
101 | (void *)((unsigned long)unmapped), | |
102 | (void *)((unsigned long)unwritten), | |
f1fdc848 | 103 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
104 | (void *)NULL); |
105 | } | |
106 | #else | |
ed9d88f7 | 107 | #define xfs_page_trace(tag, inode, page, pgoff) |
1da177e4 LT |
108 | #endif |
109 | ||
6214ed44 CH |
110 | STATIC struct block_device * |
111 | xfs_find_bdev_for_inode( | |
112 | struct xfs_inode *ip) | |
113 | { | |
114 | struct xfs_mount *mp = ip->i_mount; | |
115 | ||
71ddabb9 | 116 | if (XFS_IS_REALTIME_INODE(ip)) |
6214ed44 CH |
117 | return mp->m_rtdev_targp->bt_bdev; |
118 | else | |
119 | return mp->m_ddev_targp->bt_bdev; | |
120 | } | |
121 | ||
0829c360 CH |
122 | /* |
123 | * Schedule IO completion handling on a xfsdatad if this was | |
e927af90 DC |
124 | * the final hold on this ioend. If we are asked to wait, |
125 | * flush the workqueue. | |
0829c360 CH |
126 | */ |
127 | STATIC void | |
128 | xfs_finish_ioend( | |
e927af90 DC |
129 | xfs_ioend_t *ioend, |
130 | int wait) | |
0829c360 | 131 | { |
e927af90 | 132 | if (atomic_dec_and_test(&ioend->io_remaining)) { |
0829c360 | 133 | queue_work(xfsdatad_workqueue, &ioend->io_work); |
e927af90 DC |
134 | if (wait) |
135 | flush_workqueue(xfsdatad_workqueue); | |
136 | } | |
0829c360 CH |
137 | } |
138 | ||
f6d6d4fc CH |
139 | /* |
140 | * We're now finished for good with this ioend structure. | |
141 | * Update the page state via the associated buffer_heads, | |
142 | * release holds on the inode and bio, and finally free | |
143 | * up memory. Do not use the ioend after this. | |
144 | */ | |
0829c360 CH |
145 | STATIC void |
146 | xfs_destroy_ioend( | |
147 | xfs_ioend_t *ioend) | |
148 | { | |
f6d6d4fc CH |
149 | struct buffer_head *bh, *next; |
150 | ||
151 | for (bh = ioend->io_buffer_head; bh; bh = next) { | |
152 | next = bh->b_private; | |
7d04a335 | 153 | bh->b_end_io(bh, !ioend->io_error); |
f6d6d4fc | 154 | } |
b677c210 CH |
155 | if (unlikely(ioend->io_error)) { |
156 | vn_ioerror(XFS_I(ioend->io_inode), ioend->io_error, | |
157 | __FILE__,__LINE__); | |
158 | } | |
159 | vn_iowake(XFS_I(ioend->io_inode)); | |
0829c360 CH |
160 | mempool_free(ioend, xfs_ioend_pool); |
161 | } | |
162 | ||
ba87ea69 LM |
163 | /* |
164 | * Update on-disk file size now that data has been written to disk. | |
165 | * The current in-memory file size is i_size. If a write is beyond | |
613d7043 | 166 | * eof i_new_size will be the intended file size until i_size is |
ba87ea69 LM |
167 | * updated. If this write does not extend all the way to the valid |
168 | * file size then restrict this update to the end of the write. | |
169 | */ | |
170 | STATIC void | |
171 | xfs_setfilesize( | |
172 | xfs_ioend_t *ioend) | |
173 | { | |
b677c210 | 174 | xfs_inode_t *ip = XFS_I(ioend->io_inode); |
ba87ea69 LM |
175 | xfs_fsize_t isize; |
176 | xfs_fsize_t bsize; | |
177 | ||
ba87ea69 LM |
178 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG); |
179 | ASSERT(ioend->io_type != IOMAP_READ); | |
180 | ||
181 | if (unlikely(ioend->io_error)) | |
182 | return; | |
183 | ||
184 | bsize = ioend->io_offset + ioend->io_size; | |
185 | ||
186 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
187 | ||
613d7043 | 188 | isize = MAX(ip->i_size, ip->i_new_size); |
ba87ea69 LM |
189 | isize = MIN(isize, bsize); |
190 | ||
191 | if (ip->i_d.di_size < isize) { | |
192 | ip->i_d.di_size = isize; | |
193 | ip->i_update_core = 1; | |
194 | ip->i_update_size = 1; | |
150f29ef | 195 | mark_inode_dirty_sync(ioend->io_inode); |
ba87ea69 LM |
196 | } |
197 | ||
198 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
199 | } | |
200 | ||
0829c360 | 201 | /* |
f6d6d4fc | 202 | * Buffered IO write completion for delayed allocate extents. |
f6d6d4fc CH |
203 | */ |
204 | STATIC void | |
205 | xfs_end_bio_delalloc( | |
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 | * Buffered IO write completion for regular, written extents. | |
217 | */ | |
218 | STATIC void | |
219 | xfs_end_bio_written( | |
c4028958 | 220 | struct work_struct *work) |
f6d6d4fc | 221 | { |
c4028958 DH |
222 | xfs_ioend_t *ioend = |
223 | container_of(work, xfs_ioend_t, io_work); | |
f6d6d4fc | 224 | |
ba87ea69 | 225 | xfs_setfilesize(ioend); |
f6d6d4fc CH |
226 | xfs_destroy_ioend(ioend); |
227 | } | |
228 | ||
229 | /* | |
230 | * IO write completion for unwritten extents. | |
231 | * | |
0829c360 | 232 | * Issue transactions to convert a buffer range from unwritten |
f0973863 | 233 | * to written extents. |
0829c360 CH |
234 | */ |
235 | STATIC void | |
236 | xfs_end_bio_unwritten( | |
c4028958 | 237 | struct work_struct *work) |
0829c360 | 238 | { |
c4028958 DH |
239 | xfs_ioend_t *ioend = |
240 | container_of(work, xfs_ioend_t, io_work); | |
7642861b | 241 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
0829c360 CH |
242 | xfs_off_t offset = ioend->io_offset; |
243 | size_t size = ioend->io_size; | |
0829c360 | 244 | |
ba87ea69 | 245 | if (likely(!ioend->io_error)) { |
cc88466f DC |
246 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
247 | int error; | |
248 | error = xfs_iomap_write_unwritten(ip, offset, size); | |
249 | if (error) | |
250 | ioend->io_error = error; | |
251 | } | |
ba87ea69 LM |
252 | xfs_setfilesize(ioend); |
253 | } | |
254 | xfs_destroy_ioend(ioend); | |
255 | } | |
256 | ||
257 | /* | |
258 | * IO read completion for regular, written extents. | |
259 | */ | |
260 | STATIC void | |
261 | xfs_end_bio_read( | |
262 | struct work_struct *work) | |
263 | { | |
264 | xfs_ioend_t *ioend = | |
265 | container_of(work, xfs_ioend_t, io_work); | |
266 | ||
0829c360 CH |
267 | xfs_destroy_ioend(ioend); |
268 | } | |
269 | ||
270 | /* | |
271 | * Allocate and initialise an IO completion structure. | |
272 | * We need to track unwritten extent write completion here initially. | |
273 | * We'll need to extend this for updating the ondisk inode size later | |
274 | * (vs. incore size). | |
275 | */ | |
276 | STATIC xfs_ioend_t * | |
277 | xfs_alloc_ioend( | |
f6d6d4fc CH |
278 | struct inode *inode, |
279 | unsigned int type) | |
0829c360 CH |
280 | { |
281 | xfs_ioend_t *ioend; | |
282 | ||
283 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); | |
284 | ||
285 | /* | |
286 | * Set the count to 1 initially, which will prevent an I/O | |
287 | * completion callback from happening before we have started | |
288 | * all the I/O from calling the completion routine too early. | |
289 | */ | |
290 | atomic_set(&ioend->io_remaining, 1); | |
7d04a335 | 291 | ioend->io_error = 0; |
f6d6d4fc CH |
292 | ioend->io_list = NULL; |
293 | ioend->io_type = type; | |
b677c210 | 294 | ioend->io_inode = inode; |
c1a073bd | 295 | ioend->io_buffer_head = NULL; |
f6d6d4fc | 296 | ioend->io_buffer_tail = NULL; |
b677c210 | 297 | atomic_inc(&XFS_I(ioend->io_inode)->i_iocount); |
0829c360 CH |
298 | ioend->io_offset = 0; |
299 | ioend->io_size = 0; | |
300 | ||
f6d6d4fc | 301 | if (type == IOMAP_UNWRITTEN) |
c4028958 | 302 | INIT_WORK(&ioend->io_work, xfs_end_bio_unwritten); |
f6d6d4fc | 303 | else if (type == IOMAP_DELAY) |
c4028958 | 304 | INIT_WORK(&ioend->io_work, xfs_end_bio_delalloc); |
ba87ea69 LM |
305 | else if (type == IOMAP_READ) |
306 | INIT_WORK(&ioend->io_work, xfs_end_bio_read); | |
f6d6d4fc | 307 | else |
c4028958 | 308 | INIT_WORK(&ioend->io_work, xfs_end_bio_written); |
0829c360 CH |
309 | |
310 | return ioend; | |
311 | } | |
312 | ||
1da177e4 LT |
313 | STATIC int |
314 | xfs_map_blocks( | |
315 | struct inode *inode, | |
316 | loff_t offset, | |
317 | ssize_t count, | |
318 | xfs_iomap_t *mapp, | |
319 | int flags) | |
320 | { | |
b3aea4ed | 321 | xfs_inode_t *ip = XFS_I(inode); |
1da177e4 LT |
322 | int error, nmaps = 1; |
323 | ||
541d7d3c | 324 | error = xfs_iomap(ip, offset, count, |
739bfb2a | 325 | flags, mapp, &nmaps); |
1da177e4 | 326 | if (!error && (flags & (BMAPI_WRITE|BMAPI_ALLOCATE))) |
b3aea4ed | 327 | xfs_iflags_set(ip, XFS_IMODIFIED); |
1da177e4 LT |
328 | return -error; |
329 | } | |
330 | ||
7989cb8e | 331 | STATIC_INLINE int |
1defeac9 | 332 | xfs_iomap_valid( |
1da177e4 | 333 | xfs_iomap_t *iomapp, |
1defeac9 | 334 | loff_t offset) |
1da177e4 | 335 | { |
1defeac9 CH |
336 | return offset >= iomapp->iomap_offset && |
337 | offset < iomapp->iomap_offset + iomapp->iomap_bsize; | |
1da177e4 LT |
338 | } |
339 | ||
f6d6d4fc CH |
340 | /* |
341 | * BIO completion handler for buffered IO. | |
342 | */ | |
782e3b3b | 343 | STATIC void |
f6d6d4fc CH |
344 | xfs_end_bio( |
345 | struct bio *bio, | |
f6d6d4fc CH |
346 | int error) |
347 | { | |
348 | xfs_ioend_t *ioend = bio->bi_private; | |
349 | ||
f6d6d4fc | 350 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
7d04a335 | 351 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
f6d6d4fc CH |
352 | |
353 | /* Toss bio and pass work off to an xfsdatad thread */ | |
f6d6d4fc CH |
354 | bio->bi_private = NULL; |
355 | bio->bi_end_io = NULL; | |
f6d6d4fc | 356 | bio_put(bio); |
7d04a335 | 357 | |
e927af90 | 358 | xfs_finish_ioend(ioend, 0); |
f6d6d4fc CH |
359 | } |
360 | ||
361 | STATIC void | |
362 | xfs_submit_ioend_bio( | |
363 | xfs_ioend_t *ioend, | |
364 | struct bio *bio) | |
365 | { | |
366 | atomic_inc(&ioend->io_remaining); | |
367 | ||
368 | bio->bi_private = ioend; | |
369 | bio->bi_end_io = xfs_end_bio; | |
370 | ||
371 | submit_bio(WRITE, bio); | |
372 | ASSERT(!bio_flagged(bio, BIO_EOPNOTSUPP)); | |
373 | bio_put(bio); | |
374 | } | |
375 | ||
376 | STATIC struct bio * | |
377 | xfs_alloc_ioend_bio( | |
378 | struct buffer_head *bh) | |
379 | { | |
380 | struct bio *bio; | |
381 | int nvecs = bio_get_nr_vecs(bh->b_bdev); | |
382 | ||
383 | do { | |
384 | bio = bio_alloc(GFP_NOIO, nvecs); | |
385 | nvecs >>= 1; | |
386 | } while (!bio); | |
387 | ||
388 | ASSERT(bio->bi_private == NULL); | |
389 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); | |
390 | bio->bi_bdev = bh->b_bdev; | |
391 | bio_get(bio); | |
392 | return bio; | |
393 | } | |
394 | ||
395 | STATIC void | |
396 | xfs_start_buffer_writeback( | |
397 | struct buffer_head *bh) | |
398 | { | |
399 | ASSERT(buffer_mapped(bh)); | |
400 | ASSERT(buffer_locked(bh)); | |
401 | ASSERT(!buffer_delay(bh)); | |
402 | ASSERT(!buffer_unwritten(bh)); | |
403 | ||
404 | mark_buffer_async_write(bh); | |
405 | set_buffer_uptodate(bh); | |
406 | clear_buffer_dirty(bh); | |
407 | } | |
408 | ||
409 | STATIC void | |
410 | xfs_start_page_writeback( | |
411 | struct page *page, | |
f6d6d4fc CH |
412 | int clear_dirty, |
413 | int buffers) | |
414 | { | |
415 | ASSERT(PageLocked(page)); | |
416 | ASSERT(!PageWriteback(page)); | |
f6d6d4fc | 417 | if (clear_dirty) |
92132021 DC |
418 | clear_page_dirty_for_io(page); |
419 | set_page_writeback(page); | |
f6d6d4fc | 420 | unlock_page(page); |
1f7decf6 FW |
421 | /* If no buffers on the page are to be written, finish it here */ |
422 | if (!buffers) | |
f6d6d4fc | 423 | end_page_writeback(page); |
f6d6d4fc CH |
424 | } |
425 | ||
426 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) | |
427 | { | |
428 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
429 | } | |
430 | ||
431 | /* | |
d88992f6 DC |
432 | * Submit all of the bios for all of the ioends we have saved up, covering the |
433 | * initial writepage page and also any probed pages. | |
434 | * | |
435 | * Because we may have multiple ioends spanning a page, we need to start | |
436 | * writeback on all the buffers before we submit them for I/O. If we mark the | |
437 | * buffers as we got, then we can end up with a page that only has buffers | |
438 | * marked async write and I/O complete on can occur before we mark the other | |
439 | * buffers async write. | |
440 | * | |
441 | * The end result of this is that we trip a bug in end_page_writeback() because | |
442 | * we call it twice for the one page as the code in end_buffer_async_write() | |
443 | * assumes that all buffers on the page are started at the same time. | |
444 | * | |
445 | * The fix is two passes across the ioend list - one to start writeback on the | |
c41564b5 | 446 | * buffer_heads, and then submit them for I/O on the second pass. |
f6d6d4fc CH |
447 | */ |
448 | STATIC void | |
449 | xfs_submit_ioend( | |
450 | xfs_ioend_t *ioend) | |
451 | { | |
d88992f6 | 452 | xfs_ioend_t *head = ioend; |
f6d6d4fc CH |
453 | xfs_ioend_t *next; |
454 | struct buffer_head *bh; | |
455 | struct bio *bio; | |
456 | sector_t lastblock = 0; | |
457 | ||
d88992f6 DC |
458 | /* Pass 1 - start writeback */ |
459 | do { | |
460 | next = ioend->io_list; | |
461 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { | |
462 | xfs_start_buffer_writeback(bh); | |
463 | } | |
464 | } while ((ioend = next) != NULL); | |
465 | ||
466 | /* Pass 2 - submit I/O */ | |
467 | ioend = head; | |
f6d6d4fc CH |
468 | do { |
469 | next = ioend->io_list; | |
470 | bio = NULL; | |
471 | ||
472 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { | |
f6d6d4fc CH |
473 | |
474 | if (!bio) { | |
475 | retry: | |
476 | bio = xfs_alloc_ioend_bio(bh); | |
477 | } else if (bh->b_blocknr != lastblock + 1) { | |
478 | xfs_submit_ioend_bio(ioend, bio); | |
479 | goto retry; | |
480 | } | |
481 | ||
482 | if (bio_add_buffer(bio, bh) != bh->b_size) { | |
483 | xfs_submit_ioend_bio(ioend, bio); | |
484 | goto retry; | |
485 | } | |
486 | ||
487 | lastblock = bh->b_blocknr; | |
488 | } | |
489 | if (bio) | |
490 | xfs_submit_ioend_bio(ioend, bio); | |
e927af90 | 491 | xfs_finish_ioend(ioend, 0); |
f6d6d4fc CH |
492 | } while ((ioend = next) != NULL); |
493 | } | |
494 | ||
495 | /* | |
496 | * Cancel submission of all buffer_heads so far in this endio. | |
497 | * Toss the endio too. Only ever called for the initial page | |
498 | * in a writepage request, so only ever one page. | |
499 | */ | |
500 | STATIC void | |
501 | xfs_cancel_ioend( | |
502 | xfs_ioend_t *ioend) | |
503 | { | |
504 | xfs_ioend_t *next; | |
505 | struct buffer_head *bh, *next_bh; | |
506 | ||
507 | do { | |
508 | next = ioend->io_list; | |
509 | bh = ioend->io_buffer_head; | |
510 | do { | |
511 | next_bh = bh->b_private; | |
512 | clear_buffer_async_write(bh); | |
513 | unlock_buffer(bh); | |
514 | } while ((bh = next_bh) != NULL); | |
515 | ||
b677c210 | 516 | vn_iowake(XFS_I(ioend->io_inode)); |
f6d6d4fc CH |
517 | mempool_free(ioend, xfs_ioend_pool); |
518 | } while ((ioend = next) != NULL); | |
519 | } | |
520 | ||
521 | /* | |
522 | * Test to see if we've been building up a completion structure for | |
523 | * earlier buffers -- if so, we try to append to this ioend if we | |
524 | * can, otherwise we finish off any current ioend and start another. | |
525 | * Return true if we've finished the given ioend. | |
526 | */ | |
527 | STATIC void | |
528 | xfs_add_to_ioend( | |
529 | struct inode *inode, | |
530 | struct buffer_head *bh, | |
7336cea8 | 531 | xfs_off_t offset, |
f6d6d4fc CH |
532 | unsigned int type, |
533 | xfs_ioend_t **result, | |
534 | int need_ioend) | |
535 | { | |
536 | xfs_ioend_t *ioend = *result; | |
537 | ||
538 | if (!ioend || need_ioend || type != ioend->io_type) { | |
539 | xfs_ioend_t *previous = *result; | |
f6d6d4fc | 540 | |
f6d6d4fc CH |
541 | ioend = xfs_alloc_ioend(inode, type); |
542 | ioend->io_offset = offset; | |
543 | ioend->io_buffer_head = bh; | |
544 | ioend->io_buffer_tail = bh; | |
545 | if (previous) | |
546 | previous->io_list = ioend; | |
547 | *result = ioend; | |
548 | } else { | |
549 | ioend->io_buffer_tail->b_private = bh; | |
550 | ioend->io_buffer_tail = bh; | |
551 | } | |
552 | ||
553 | bh->b_private = NULL; | |
554 | ioend->io_size += bh->b_size; | |
555 | } | |
556 | ||
87cbc49c NS |
557 | STATIC void |
558 | xfs_map_buffer( | |
559 | struct buffer_head *bh, | |
560 | xfs_iomap_t *mp, | |
561 | xfs_off_t offset, | |
562 | uint block_bits) | |
563 | { | |
564 | sector_t bn; | |
565 | ||
566 | ASSERT(mp->iomap_bn != IOMAP_DADDR_NULL); | |
567 | ||
568 | bn = (mp->iomap_bn >> (block_bits - BBSHIFT)) + | |
569 | ((offset - mp->iomap_offset) >> block_bits); | |
570 | ||
571 | ASSERT(bn || (mp->iomap_flags & IOMAP_REALTIME)); | |
572 | ||
573 | bh->b_blocknr = bn; | |
574 | set_buffer_mapped(bh); | |
575 | } | |
576 | ||
1da177e4 LT |
577 | STATIC void |
578 | xfs_map_at_offset( | |
1da177e4 | 579 | struct buffer_head *bh, |
1defeac9 | 580 | loff_t offset, |
1da177e4 | 581 | int block_bits, |
1defeac9 | 582 | xfs_iomap_t *iomapp) |
1da177e4 | 583 | { |
1da177e4 LT |
584 | ASSERT(!(iomapp->iomap_flags & IOMAP_HOLE)); |
585 | ASSERT(!(iomapp->iomap_flags & IOMAP_DELAY)); | |
1da177e4 LT |
586 | |
587 | lock_buffer(bh); | |
87cbc49c | 588 | xfs_map_buffer(bh, iomapp, offset, block_bits); |
ce8e922c | 589 | bh->b_bdev = iomapp->iomap_target->bt_bdev; |
1da177e4 LT |
590 | set_buffer_mapped(bh); |
591 | clear_buffer_delay(bh); | |
f6d6d4fc | 592 | clear_buffer_unwritten(bh); |
1da177e4 LT |
593 | } |
594 | ||
595 | /* | |
6c4fe19f | 596 | * Look for a page at index that is suitable for clustering. |
1da177e4 LT |
597 | */ |
598 | STATIC unsigned int | |
6c4fe19f | 599 | xfs_probe_page( |
10ce4444 | 600 | struct page *page, |
6c4fe19f CH |
601 | unsigned int pg_offset, |
602 | int mapped) | |
1da177e4 | 603 | { |
1da177e4 LT |
604 | int ret = 0; |
605 | ||
1da177e4 | 606 | if (PageWriteback(page)) |
10ce4444 | 607 | return 0; |
1da177e4 LT |
608 | |
609 | if (page->mapping && PageDirty(page)) { | |
610 | if (page_has_buffers(page)) { | |
611 | struct buffer_head *bh, *head; | |
612 | ||
613 | bh = head = page_buffers(page); | |
614 | do { | |
6c4fe19f CH |
615 | if (!buffer_uptodate(bh)) |
616 | break; | |
617 | if (mapped != buffer_mapped(bh)) | |
1da177e4 LT |
618 | break; |
619 | ret += bh->b_size; | |
620 | if (ret >= pg_offset) | |
621 | break; | |
622 | } while ((bh = bh->b_this_page) != head); | |
623 | } else | |
6c4fe19f | 624 | ret = mapped ? 0 : PAGE_CACHE_SIZE; |
1da177e4 LT |
625 | } |
626 | ||
1da177e4 LT |
627 | return ret; |
628 | } | |
629 | ||
f6d6d4fc | 630 | STATIC size_t |
6c4fe19f | 631 | xfs_probe_cluster( |
1da177e4 LT |
632 | struct inode *inode, |
633 | struct page *startpage, | |
634 | struct buffer_head *bh, | |
6c4fe19f CH |
635 | struct buffer_head *head, |
636 | int mapped) | |
1da177e4 | 637 | { |
10ce4444 | 638 | struct pagevec pvec; |
1da177e4 | 639 | pgoff_t tindex, tlast, tloff; |
10ce4444 CH |
640 | size_t total = 0; |
641 | int done = 0, i; | |
1da177e4 LT |
642 | |
643 | /* First sum forwards in this page */ | |
644 | do { | |
2353e8e9 | 645 | if (!buffer_uptodate(bh) || (mapped != buffer_mapped(bh))) |
10ce4444 | 646 | return total; |
1da177e4 LT |
647 | total += bh->b_size; |
648 | } while ((bh = bh->b_this_page) != head); | |
649 | ||
10ce4444 CH |
650 | /* if we reached the end of the page, sum forwards in following pages */ |
651 | tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT; | |
652 | tindex = startpage->index + 1; | |
653 | ||
654 | /* Prune this back to avoid pathological behavior */ | |
655 | tloff = min(tlast, startpage->index + 64); | |
656 | ||
657 | pagevec_init(&pvec, 0); | |
658 | while (!done && tindex <= tloff) { | |
659 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
660 | ||
661 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
662 | break; | |
663 | ||
664 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
665 | struct page *page = pvec.pages[i]; | |
265c1fac | 666 | size_t pg_offset, pg_len = 0; |
10ce4444 CH |
667 | |
668 | if (tindex == tlast) { | |
669 | pg_offset = | |
670 | i_size_read(inode) & (PAGE_CACHE_SIZE - 1); | |
1defeac9 CH |
671 | if (!pg_offset) { |
672 | done = 1; | |
10ce4444 | 673 | break; |
1defeac9 | 674 | } |
10ce4444 CH |
675 | } else |
676 | pg_offset = PAGE_CACHE_SIZE; | |
677 | ||
529ae9aa | 678 | if (page->index == tindex && trylock_page(page)) { |
265c1fac | 679 | pg_len = xfs_probe_page(page, pg_offset, mapped); |
10ce4444 CH |
680 | unlock_page(page); |
681 | } | |
682 | ||
265c1fac | 683 | if (!pg_len) { |
10ce4444 CH |
684 | done = 1; |
685 | break; | |
686 | } | |
687 | ||
265c1fac | 688 | total += pg_len; |
1defeac9 | 689 | tindex++; |
1da177e4 | 690 | } |
10ce4444 CH |
691 | |
692 | pagevec_release(&pvec); | |
693 | cond_resched(); | |
1da177e4 | 694 | } |
10ce4444 | 695 | |
1da177e4 LT |
696 | return total; |
697 | } | |
698 | ||
699 | /* | |
10ce4444 CH |
700 | * Test if a given page is suitable for writing as part of an unwritten |
701 | * or delayed allocate extent. | |
1da177e4 | 702 | */ |
10ce4444 CH |
703 | STATIC int |
704 | xfs_is_delayed_page( | |
705 | struct page *page, | |
f6d6d4fc | 706 | unsigned int type) |
1da177e4 | 707 | { |
1da177e4 | 708 | if (PageWriteback(page)) |
10ce4444 | 709 | return 0; |
1da177e4 LT |
710 | |
711 | if (page->mapping && page_has_buffers(page)) { | |
712 | struct buffer_head *bh, *head; | |
713 | int acceptable = 0; | |
714 | ||
715 | bh = head = page_buffers(page); | |
716 | do { | |
f6d6d4fc CH |
717 | if (buffer_unwritten(bh)) |
718 | acceptable = (type == IOMAP_UNWRITTEN); | |
719 | else if (buffer_delay(bh)) | |
720 | acceptable = (type == IOMAP_DELAY); | |
2ddee844 | 721 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
df3c7244 | 722 | acceptable = (type == IOMAP_NEW); |
f6d6d4fc | 723 | else |
1da177e4 | 724 | break; |
1da177e4 LT |
725 | } while ((bh = bh->b_this_page) != head); |
726 | ||
727 | if (acceptable) | |
10ce4444 | 728 | return 1; |
1da177e4 LT |
729 | } |
730 | ||
10ce4444 | 731 | return 0; |
1da177e4 LT |
732 | } |
733 | ||
1da177e4 LT |
734 | /* |
735 | * Allocate & map buffers for page given the extent map. Write it out. | |
736 | * except for the original page of a writepage, this is called on | |
737 | * delalloc/unwritten pages only, for the original page it is possible | |
738 | * that the page has no mapping at all. | |
739 | */ | |
f6d6d4fc | 740 | STATIC int |
1da177e4 LT |
741 | xfs_convert_page( |
742 | struct inode *inode, | |
743 | struct page *page, | |
10ce4444 | 744 | loff_t tindex, |
1defeac9 | 745 | xfs_iomap_t *mp, |
f6d6d4fc | 746 | xfs_ioend_t **ioendp, |
1da177e4 | 747 | struct writeback_control *wbc, |
1da177e4 LT |
748 | int startio, |
749 | int all_bh) | |
750 | { | |
f6d6d4fc | 751 | struct buffer_head *bh, *head; |
9260dc6b CH |
752 | xfs_off_t end_offset; |
753 | unsigned long p_offset; | |
f6d6d4fc | 754 | unsigned int type; |
1da177e4 | 755 | int bbits = inode->i_blkbits; |
24e17b5f | 756 | int len, page_dirty; |
f6d6d4fc | 757 | int count = 0, done = 0, uptodate = 1; |
9260dc6b | 758 | xfs_off_t offset = page_offset(page); |
1da177e4 | 759 | |
10ce4444 CH |
760 | if (page->index != tindex) |
761 | goto fail; | |
529ae9aa | 762 | if (!trylock_page(page)) |
10ce4444 CH |
763 | goto fail; |
764 | if (PageWriteback(page)) | |
765 | goto fail_unlock_page; | |
766 | if (page->mapping != inode->i_mapping) | |
767 | goto fail_unlock_page; | |
768 | if (!xfs_is_delayed_page(page, (*ioendp)->io_type)) | |
769 | goto fail_unlock_page; | |
770 | ||
24e17b5f NS |
771 | /* |
772 | * page_dirty is initially a count of buffers on the page before | |
c41564b5 | 773 | * EOF and is decremented as we move each into a cleanable state. |
9260dc6b CH |
774 | * |
775 | * Derivation: | |
776 | * | |
777 | * End offset is the highest offset that this page should represent. | |
778 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
779 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
780 | * hence give us the correct page_dirty count. On any other page, | |
781 | * it will be zero and in that case we need page_dirty to be the | |
782 | * count of buffers on the page. | |
24e17b5f | 783 | */ |
9260dc6b CH |
784 | end_offset = min_t(unsigned long long, |
785 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, | |
786 | i_size_read(inode)); | |
787 | ||
24e17b5f | 788 | len = 1 << inode->i_blkbits; |
9260dc6b CH |
789 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
790 | PAGE_CACHE_SIZE); | |
791 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
792 | page_dirty = p_offset / len; | |
24e17b5f | 793 | |
1da177e4 LT |
794 | bh = head = page_buffers(page); |
795 | do { | |
9260dc6b | 796 | if (offset >= end_offset) |
1da177e4 | 797 | break; |
f6d6d4fc CH |
798 | if (!buffer_uptodate(bh)) |
799 | uptodate = 0; | |
800 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { | |
801 | done = 1; | |
1da177e4 | 802 | continue; |
f6d6d4fc CH |
803 | } |
804 | ||
9260dc6b CH |
805 | if (buffer_unwritten(bh) || buffer_delay(bh)) { |
806 | if (buffer_unwritten(bh)) | |
807 | type = IOMAP_UNWRITTEN; | |
808 | else | |
809 | type = IOMAP_DELAY; | |
810 | ||
811 | if (!xfs_iomap_valid(mp, offset)) { | |
f6d6d4fc | 812 | done = 1; |
9260dc6b CH |
813 | continue; |
814 | } | |
815 | ||
816 | ASSERT(!(mp->iomap_flags & IOMAP_HOLE)); | |
817 | ASSERT(!(mp->iomap_flags & IOMAP_DELAY)); | |
818 | ||
819 | xfs_map_at_offset(bh, offset, bbits, mp); | |
820 | if (startio) { | |
7336cea8 | 821 | xfs_add_to_ioend(inode, bh, offset, |
9260dc6b CH |
822 | type, ioendp, done); |
823 | } else { | |
824 | set_buffer_dirty(bh); | |
825 | unlock_buffer(bh); | |
826 | mark_buffer_dirty(bh); | |
827 | } | |
828 | page_dirty--; | |
829 | count++; | |
830 | } else { | |
df3c7244 | 831 | type = IOMAP_NEW; |
9260dc6b | 832 | if (buffer_mapped(bh) && all_bh && startio) { |
1da177e4 | 833 | lock_buffer(bh); |
7336cea8 | 834 | xfs_add_to_ioend(inode, bh, offset, |
f6d6d4fc CH |
835 | type, ioendp, done); |
836 | count++; | |
24e17b5f | 837 | page_dirty--; |
9260dc6b CH |
838 | } else { |
839 | done = 1; | |
1da177e4 | 840 | } |
1da177e4 | 841 | } |
7336cea8 | 842 | } while (offset += len, (bh = bh->b_this_page) != head); |
1da177e4 | 843 | |
f6d6d4fc CH |
844 | if (uptodate && bh == head) |
845 | SetPageUptodate(page); | |
846 | ||
847 | if (startio) { | |
f5e596bb CH |
848 | if (count) { |
849 | struct backing_dev_info *bdi; | |
850 | ||
851 | bdi = inode->i_mapping->backing_dev_info; | |
9fddaca2 | 852 | wbc->nr_to_write--; |
f5e596bb CH |
853 | if (bdi_write_congested(bdi)) { |
854 | wbc->encountered_congestion = 1; | |
855 | done = 1; | |
9fddaca2 | 856 | } else if (wbc->nr_to_write <= 0) { |
f5e596bb CH |
857 | done = 1; |
858 | } | |
859 | } | |
b41759cf | 860 | xfs_start_page_writeback(page, !page_dirty, count); |
1da177e4 | 861 | } |
f6d6d4fc CH |
862 | |
863 | return done; | |
10ce4444 CH |
864 | fail_unlock_page: |
865 | unlock_page(page); | |
866 | fail: | |
867 | return 1; | |
1da177e4 LT |
868 | } |
869 | ||
870 | /* | |
871 | * Convert & write out a cluster of pages in the same extent as defined | |
872 | * by mp and following the start page. | |
873 | */ | |
874 | STATIC void | |
875 | xfs_cluster_write( | |
876 | struct inode *inode, | |
877 | pgoff_t tindex, | |
878 | xfs_iomap_t *iomapp, | |
f6d6d4fc | 879 | xfs_ioend_t **ioendp, |
1da177e4 LT |
880 | struct writeback_control *wbc, |
881 | int startio, | |
882 | int all_bh, | |
883 | pgoff_t tlast) | |
884 | { | |
10ce4444 CH |
885 | struct pagevec pvec; |
886 | int done = 0, i; | |
1da177e4 | 887 | |
10ce4444 CH |
888 | pagevec_init(&pvec, 0); |
889 | while (!done && tindex <= tlast) { | |
890 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
891 | ||
892 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
1da177e4 | 893 | break; |
10ce4444 CH |
894 | |
895 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
896 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, | |
897 | iomapp, ioendp, wbc, startio, all_bh); | |
898 | if (done) | |
899 | break; | |
900 | } | |
901 | ||
902 | pagevec_release(&pvec); | |
903 | cond_resched(); | |
1da177e4 LT |
904 | } |
905 | } | |
906 | ||
907 | /* | |
908 | * Calling this without startio set means we are being asked to make a dirty | |
909 | * page ready for freeing it's buffers. When called with startio set then | |
910 | * we are coming from writepage. | |
911 | * | |
912 | * When called with startio set it is important that we write the WHOLE | |
913 | * page if possible. | |
914 | * The bh->b_state's cannot know if any of the blocks or which block for | |
915 | * that matter are dirty due to mmap writes, and therefore bh uptodate is | |
c41564b5 | 916 | * only valid if the page itself isn't completely uptodate. Some layers |
1da177e4 LT |
917 | * may clear the page dirty flag prior to calling write page, under the |
918 | * assumption the entire page will be written out; by not writing out the | |
919 | * whole page the page can be reused before all valid dirty data is | |
920 | * written out. Note: in the case of a page that has been dirty'd by | |
921 | * mapwrite and but partially setup by block_prepare_write the | |
922 | * bh->b_states's will not agree and only ones setup by BPW/BCW will have | |
923 | * valid state, thus the whole page must be written out thing. | |
924 | */ | |
925 | ||
926 | STATIC int | |
927 | xfs_page_state_convert( | |
928 | struct inode *inode, | |
929 | struct page *page, | |
930 | struct writeback_control *wbc, | |
931 | int startio, | |
932 | int unmapped) /* also implies page uptodate */ | |
933 | { | |
f6d6d4fc | 934 | struct buffer_head *bh, *head; |
1defeac9 | 935 | xfs_iomap_t iomap; |
f6d6d4fc | 936 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
1da177e4 LT |
937 | loff_t offset; |
938 | unsigned long p_offset = 0; | |
f6d6d4fc | 939 | unsigned int type; |
1da177e4 LT |
940 | __uint64_t end_offset; |
941 | pgoff_t end_index, last_index, tlast; | |
d5cb48aa CH |
942 | ssize_t size, len; |
943 | int flags, err, iomap_valid = 0, uptodate = 1; | |
8272145c NS |
944 | int page_dirty, count = 0; |
945 | int trylock = 0; | |
6c4fe19f | 946 | int all_bh = unmapped; |
1da177e4 | 947 | |
8272145c NS |
948 | if (startio) { |
949 | if (wbc->sync_mode == WB_SYNC_NONE && wbc->nonblocking) | |
950 | trylock |= BMAPI_TRYLOCK; | |
951 | } | |
3ba0815a | 952 | |
1da177e4 LT |
953 | /* Is this page beyond the end of the file? */ |
954 | offset = i_size_read(inode); | |
955 | end_index = offset >> PAGE_CACHE_SHIFT; | |
956 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; | |
957 | if (page->index >= end_index) { | |
958 | if ((page->index >= end_index + 1) || | |
959 | !(i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) { | |
19d5bcf3 NS |
960 | if (startio) |
961 | unlock_page(page); | |
962 | return 0; | |
1da177e4 LT |
963 | } |
964 | } | |
965 | ||
1da177e4 | 966 | /* |
24e17b5f | 967 | * page_dirty is initially a count of buffers on the page before |
c41564b5 | 968 | * EOF and is decremented as we move each into a cleanable state. |
f6d6d4fc CH |
969 | * |
970 | * Derivation: | |
971 | * | |
972 | * End offset is the highest offset that this page should represent. | |
973 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
974 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
975 | * hence give us the correct page_dirty count. On any other page, | |
976 | * it will be zero and in that case we need page_dirty to be the | |
977 | * count of buffers on the page. | |
978 | */ | |
979 | end_offset = min_t(unsigned long long, | |
980 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, offset); | |
24e17b5f | 981 | len = 1 << inode->i_blkbits; |
f6d6d4fc CH |
982 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
983 | PAGE_CACHE_SIZE); | |
984 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
24e17b5f NS |
985 | page_dirty = p_offset / len; |
986 | ||
24e17b5f | 987 | bh = head = page_buffers(page); |
f6d6d4fc | 988 | offset = page_offset(page); |
df3c7244 DC |
989 | flags = BMAPI_READ; |
990 | type = IOMAP_NEW; | |
f6d6d4fc | 991 | |
f6d6d4fc | 992 | /* TODO: cleanup count and page_dirty */ |
1da177e4 LT |
993 | |
994 | do { | |
995 | if (offset >= end_offset) | |
996 | break; | |
997 | if (!buffer_uptodate(bh)) | |
998 | uptodate = 0; | |
f6d6d4fc | 999 | if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio) { |
1defeac9 CH |
1000 | /* |
1001 | * the iomap is actually still valid, but the ioend | |
1002 | * isn't. shouldn't happen too often. | |
1003 | */ | |
1004 | iomap_valid = 0; | |
1da177e4 | 1005 | continue; |
f6d6d4fc | 1006 | } |
1da177e4 | 1007 | |
1defeac9 CH |
1008 | if (iomap_valid) |
1009 | iomap_valid = xfs_iomap_valid(&iomap, offset); | |
1da177e4 LT |
1010 | |
1011 | /* | |
1012 | * First case, map an unwritten extent and prepare for | |
1013 | * extent state conversion transaction on completion. | |
f6d6d4fc | 1014 | * |
1da177e4 LT |
1015 | * Second case, allocate space for a delalloc buffer. |
1016 | * We can return EAGAIN here in the release page case. | |
d5cb48aa CH |
1017 | * |
1018 | * Third case, an unmapped buffer was found, and we are | |
1019 | * in a path where we need to write the whole page out. | |
df3c7244 | 1020 | */ |
d5cb48aa CH |
1021 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
1022 | ((buffer_uptodate(bh) || PageUptodate(page)) && | |
1023 | !buffer_mapped(bh) && (unmapped || startio))) { | |
effd120e DC |
1024 | int new_ioend = 0; |
1025 | ||
df3c7244 | 1026 | /* |
6c4fe19f CH |
1027 | * Make sure we don't use a read-only iomap |
1028 | */ | |
df3c7244 | 1029 | if (flags == BMAPI_READ) |
6c4fe19f CH |
1030 | iomap_valid = 0; |
1031 | ||
f6d6d4fc CH |
1032 | if (buffer_unwritten(bh)) { |
1033 | type = IOMAP_UNWRITTEN; | |
8272145c | 1034 | flags = BMAPI_WRITE | BMAPI_IGNSTATE; |
d5cb48aa | 1035 | } else if (buffer_delay(bh)) { |
f6d6d4fc | 1036 | type = IOMAP_DELAY; |
8272145c | 1037 | flags = BMAPI_ALLOCATE | trylock; |
d5cb48aa | 1038 | } else { |
6c4fe19f | 1039 | type = IOMAP_NEW; |
8272145c | 1040 | flags = BMAPI_WRITE | BMAPI_MMAP; |
f6d6d4fc CH |
1041 | } |
1042 | ||
1defeac9 | 1043 | if (!iomap_valid) { |
effd120e DC |
1044 | /* |
1045 | * if we didn't have a valid mapping then we | |
1046 | * need to ensure that we put the new mapping | |
1047 | * in a new ioend structure. This needs to be | |
1048 | * done to ensure that the ioends correctly | |
1049 | * reflect the block mappings at io completion | |
1050 | * for unwritten extent conversion. | |
1051 | */ | |
1052 | new_ioend = 1; | |
6c4fe19f CH |
1053 | if (type == IOMAP_NEW) { |
1054 | size = xfs_probe_cluster(inode, | |
1055 | page, bh, head, 0); | |
d5cb48aa CH |
1056 | } else { |
1057 | size = len; | |
1058 | } | |
1059 | ||
1060 | err = xfs_map_blocks(inode, offset, size, | |
1061 | &iomap, flags); | |
f6d6d4fc | 1062 | if (err) |
1da177e4 | 1063 | goto error; |
1defeac9 | 1064 | iomap_valid = xfs_iomap_valid(&iomap, offset); |
1da177e4 | 1065 | } |
1defeac9 CH |
1066 | if (iomap_valid) { |
1067 | xfs_map_at_offset(bh, offset, | |
1068 | inode->i_blkbits, &iomap); | |
1da177e4 | 1069 | if (startio) { |
7336cea8 | 1070 | xfs_add_to_ioend(inode, bh, offset, |
1defeac9 | 1071 | type, &ioend, |
effd120e | 1072 | new_ioend); |
1da177e4 LT |
1073 | } else { |
1074 | set_buffer_dirty(bh); | |
1075 | unlock_buffer(bh); | |
1076 | mark_buffer_dirty(bh); | |
1077 | } | |
1078 | page_dirty--; | |
f6d6d4fc | 1079 | count++; |
1da177e4 | 1080 | } |
d5cb48aa | 1081 | } else if (buffer_uptodate(bh) && startio) { |
6c4fe19f CH |
1082 | /* |
1083 | * we got here because the buffer is already mapped. | |
1084 | * That means it must already have extents allocated | |
1085 | * underneath it. Map the extent by reading it. | |
1086 | */ | |
df3c7244 | 1087 | if (!iomap_valid || flags != BMAPI_READ) { |
6c4fe19f CH |
1088 | flags = BMAPI_READ; |
1089 | size = xfs_probe_cluster(inode, page, bh, | |
1090 | head, 1); | |
1091 | err = xfs_map_blocks(inode, offset, size, | |
1092 | &iomap, flags); | |
1093 | if (err) | |
1094 | goto error; | |
1095 | iomap_valid = xfs_iomap_valid(&iomap, offset); | |
1096 | } | |
d5cb48aa | 1097 | |
df3c7244 DC |
1098 | /* |
1099 | * We set the type to IOMAP_NEW in case we are doing a | |
1100 | * small write at EOF that is extending the file but | |
1101 | * without needing an allocation. We need to update the | |
1102 | * file size on I/O completion in this case so it is | |
1103 | * the same case as having just allocated a new extent | |
1104 | * that we are writing into for the first time. | |
1105 | */ | |
1106 | type = IOMAP_NEW; | |
ca5de404 | 1107 | if (trylock_buffer(bh)) { |
d5cb48aa | 1108 | ASSERT(buffer_mapped(bh)); |
6c4fe19f CH |
1109 | if (iomap_valid) |
1110 | all_bh = 1; | |
7336cea8 | 1111 | xfs_add_to_ioend(inode, bh, offset, type, |
d5cb48aa CH |
1112 | &ioend, !iomap_valid); |
1113 | page_dirty--; | |
1114 | count++; | |
f6d6d4fc | 1115 | } else { |
1defeac9 | 1116 | iomap_valid = 0; |
1da177e4 | 1117 | } |
d5cb48aa CH |
1118 | } else if ((buffer_uptodate(bh) || PageUptodate(page)) && |
1119 | (unmapped || startio)) { | |
1120 | iomap_valid = 0; | |
1da177e4 | 1121 | } |
f6d6d4fc CH |
1122 | |
1123 | if (!iohead) | |
1124 | iohead = ioend; | |
1125 | ||
1126 | } while (offset += len, ((bh = bh->b_this_page) != head)); | |
1da177e4 LT |
1127 | |
1128 | if (uptodate && bh == head) | |
1129 | SetPageUptodate(page); | |
1130 | ||
f6d6d4fc | 1131 | if (startio) |
b41759cf | 1132 | xfs_start_page_writeback(page, 1, count); |
1da177e4 | 1133 | |
1defeac9 CH |
1134 | if (ioend && iomap_valid) { |
1135 | offset = (iomap.iomap_offset + iomap.iomap_bsize - 1) >> | |
1da177e4 | 1136 | PAGE_CACHE_SHIFT; |
775bf6c9 | 1137 | tlast = min_t(pgoff_t, offset, last_index); |
1defeac9 | 1138 | xfs_cluster_write(inode, page->index + 1, &iomap, &ioend, |
6c4fe19f | 1139 | wbc, startio, all_bh, tlast); |
1da177e4 LT |
1140 | } |
1141 | ||
f6d6d4fc CH |
1142 | if (iohead) |
1143 | xfs_submit_ioend(iohead); | |
1144 | ||
1da177e4 LT |
1145 | return page_dirty; |
1146 | ||
1147 | error: | |
f6d6d4fc CH |
1148 | if (iohead) |
1149 | xfs_cancel_ioend(iohead); | |
1da177e4 LT |
1150 | |
1151 | /* | |
1152 | * If it's delalloc and we have nowhere to put it, | |
1153 | * throw it away, unless the lower layers told | |
1154 | * us to try again. | |
1155 | */ | |
1156 | if (err != -EAGAIN) { | |
f6d6d4fc | 1157 | if (!unmapped) |
1da177e4 | 1158 | block_invalidatepage(page, 0); |
1da177e4 LT |
1159 | ClearPageUptodate(page); |
1160 | } | |
1161 | return err; | |
1162 | } | |
1163 | ||
f51623b2 NS |
1164 | /* |
1165 | * writepage: Called from one of two places: | |
1166 | * | |
1167 | * 1. we are flushing a delalloc buffer head. | |
1168 | * | |
1169 | * 2. we are writing out a dirty page. Typically the page dirty | |
1170 | * state is cleared before we get here. In this case is it | |
1171 | * conceivable we have no buffer heads. | |
1172 | * | |
1173 | * For delalloc space on the page we need to allocate space and | |
1174 | * flush it. For unmapped buffer heads on the page we should | |
1175 | * allocate space if the page is uptodate. For any other dirty | |
1176 | * buffer heads on the page we should flush them. | |
1177 | * | |
1178 | * If we detect that a transaction would be required to flush | |
1179 | * the page, we have to check the process flags first, if we | |
1180 | * are already in a transaction or disk I/O during allocations | |
1181 | * is off, we need to fail the writepage and redirty the page. | |
1182 | */ | |
1183 | ||
1184 | STATIC int | |
e4c573bb | 1185 | xfs_vm_writepage( |
f51623b2 NS |
1186 | struct page *page, |
1187 | struct writeback_control *wbc) | |
1188 | { | |
1189 | int error; | |
1190 | int need_trans; | |
1191 | int delalloc, unmapped, unwritten; | |
1192 | struct inode *inode = page->mapping->host; | |
1193 | ||
1194 | xfs_page_trace(XFS_WRITEPAGE_ENTER, inode, page, 0); | |
1195 | ||
1196 | /* | |
1197 | * We need a transaction if: | |
1198 | * 1. There are delalloc buffers on the page | |
1199 | * 2. The page is uptodate and we have unmapped buffers | |
1200 | * 3. The page is uptodate and we have no buffers | |
1201 | * 4. There are unwritten buffers on the page | |
1202 | */ | |
1203 | ||
1204 | if (!page_has_buffers(page)) { | |
1205 | unmapped = 1; | |
1206 | need_trans = 1; | |
1207 | } else { | |
1208 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); | |
1209 | if (!PageUptodate(page)) | |
1210 | unmapped = 0; | |
1211 | need_trans = delalloc + unmapped + unwritten; | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * If we need a transaction and the process flags say | |
1216 | * we are already in a transaction, or no IO is allowed | |
1217 | * then mark the page dirty again and leave the page | |
1218 | * as is. | |
1219 | */ | |
59c1b082 | 1220 | if (current_test_flags(PF_FSTRANS) && need_trans) |
f51623b2 NS |
1221 | goto out_fail; |
1222 | ||
1223 | /* | |
1224 | * Delay hooking up buffer heads until we have | |
1225 | * made our go/no-go decision. | |
1226 | */ | |
1227 | if (!page_has_buffers(page)) | |
1228 | create_empty_buffers(page, 1 << inode->i_blkbits, 0); | |
1229 | ||
1230 | /* | |
1231 | * Convert delayed allocate, unwritten or unmapped space | |
1232 | * to real space and flush out to disk. | |
1233 | */ | |
1234 | error = xfs_page_state_convert(inode, page, wbc, 1, unmapped); | |
1235 | if (error == -EAGAIN) | |
1236 | goto out_fail; | |
1237 | if (unlikely(error < 0)) | |
1238 | goto out_unlock; | |
1239 | ||
1240 | return 0; | |
1241 | ||
1242 | out_fail: | |
1243 | redirty_page_for_writepage(wbc, page); | |
1244 | unlock_page(page); | |
1245 | return 0; | |
1246 | out_unlock: | |
1247 | unlock_page(page); | |
1248 | return error; | |
1249 | } | |
1250 | ||
7d4fb40a NS |
1251 | STATIC int |
1252 | xfs_vm_writepages( | |
1253 | struct address_space *mapping, | |
1254 | struct writeback_control *wbc) | |
1255 | { | |
b3aea4ed | 1256 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
7d4fb40a NS |
1257 | return generic_writepages(mapping, wbc); |
1258 | } | |
1259 | ||
f51623b2 NS |
1260 | /* |
1261 | * Called to move a page into cleanable state - and from there | |
1262 | * to be released. Possibly the page is already clean. We always | |
1263 | * have buffer heads in this call. | |
1264 | * | |
1265 | * Returns 0 if the page is ok to release, 1 otherwise. | |
1266 | * | |
1267 | * Possible scenarios are: | |
1268 | * | |
1269 | * 1. We are being called to release a page which has been written | |
1270 | * to via regular I/O. buffer heads will be dirty and possibly | |
1271 | * delalloc. If no delalloc buffer heads in this case then we | |
1272 | * can just return zero. | |
1273 | * | |
1274 | * 2. We are called to release a page which has been written via | |
1275 | * mmap, all we need to do is ensure there is no delalloc | |
1276 | * state in the buffer heads, if not we can let the caller | |
1277 | * free them and we should come back later via writepage. | |
1278 | */ | |
1279 | STATIC int | |
238f4c54 | 1280 | xfs_vm_releasepage( |
f51623b2 NS |
1281 | struct page *page, |
1282 | gfp_t gfp_mask) | |
1283 | { | |
1284 | struct inode *inode = page->mapping->host; | |
1285 | int dirty, delalloc, unmapped, unwritten; | |
1286 | struct writeback_control wbc = { | |
1287 | .sync_mode = WB_SYNC_ALL, | |
1288 | .nr_to_write = 1, | |
1289 | }; | |
1290 | ||
ed9d88f7 | 1291 | xfs_page_trace(XFS_RELEASEPAGE_ENTER, inode, page, 0); |
f51623b2 | 1292 | |
238f4c54 NS |
1293 | if (!page_has_buffers(page)) |
1294 | return 0; | |
1295 | ||
f51623b2 NS |
1296 | xfs_count_page_state(page, &delalloc, &unmapped, &unwritten); |
1297 | if (!delalloc && !unwritten) | |
1298 | goto free_buffers; | |
1299 | ||
1300 | if (!(gfp_mask & __GFP_FS)) | |
1301 | return 0; | |
1302 | ||
1303 | /* If we are already inside a transaction or the thread cannot | |
1304 | * do I/O, we cannot release this page. | |
1305 | */ | |
59c1b082 | 1306 | if (current_test_flags(PF_FSTRANS)) |
f51623b2 NS |
1307 | return 0; |
1308 | ||
1309 | /* | |
1310 | * Convert delalloc space to real space, do not flush the | |
1311 | * data out to disk, that will be done by the caller. | |
1312 | * Never need to allocate space here - we will always | |
1313 | * come back to writepage in that case. | |
1314 | */ | |
1315 | dirty = xfs_page_state_convert(inode, page, &wbc, 0, 0); | |
1316 | if (dirty == 0 && !unwritten) | |
1317 | goto free_buffers; | |
1318 | return 0; | |
1319 | ||
1320 | free_buffers: | |
1321 | return try_to_free_buffers(page); | |
1322 | } | |
1323 | ||
1da177e4 | 1324 | STATIC int |
c2536668 | 1325 | __xfs_get_blocks( |
1da177e4 LT |
1326 | struct inode *inode, |
1327 | sector_t iblock, | |
1da177e4 LT |
1328 | struct buffer_head *bh_result, |
1329 | int create, | |
1330 | int direct, | |
1331 | bmapi_flags_t flags) | |
1332 | { | |
1da177e4 | 1333 | xfs_iomap_t iomap; |
fdc7ed75 NS |
1334 | xfs_off_t offset; |
1335 | ssize_t size; | |
c2536668 | 1336 | int niomap = 1; |
1da177e4 | 1337 | int error; |
1da177e4 | 1338 | |
fdc7ed75 | 1339 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
c2536668 NS |
1340 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
1341 | size = bh_result->b_size; | |
541d7d3c | 1342 | error = xfs_iomap(XFS_I(inode), offset, size, |
67fcaa73 | 1343 | create ? flags : BMAPI_READ, &iomap, &niomap); |
1da177e4 LT |
1344 | if (error) |
1345 | return -error; | |
c2536668 | 1346 | if (niomap == 0) |
1da177e4 LT |
1347 | return 0; |
1348 | ||
1349 | if (iomap.iomap_bn != IOMAP_DADDR_NULL) { | |
87cbc49c NS |
1350 | /* |
1351 | * For unwritten extents do not report a disk address on | |
1da177e4 LT |
1352 | * the read case (treat as if we're reading into a hole). |
1353 | */ | |
1354 | if (create || !(iomap.iomap_flags & IOMAP_UNWRITTEN)) { | |
87cbc49c NS |
1355 | xfs_map_buffer(bh_result, &iomap, offset, |
1356 | inode->i_blkbits); | |
1da177e4 LT |
1357 | } |
1358 | if (create && (iomap.iomap_flags & IOMAP_UNWRITTEN)) { | |
1359 | if (direct) | |
1360 | bh_result->b_private = inode; | |
1361 | set_buffer_unwritten(bh_result); | |
1da177e4 LT |
1362 | } |
1363 | } | |
1364 | ||
c2536668 NS |
1365 | /* |
1366 | * If this is a realtime file, data may be on a different device. | |
1367 | * to that pointed to from the buffer_head b_bdev currently. | |
1368 | */ | |
ce8e922c | 1369 | bh_result->b_bdev = iomap.iomap_target->bt_bdev; |
1da177e4 | 1370 | |
c2536668 | 1371 | /* |
549054af DC |
1372 | * If we previously allocated a block out beyond eof and we are now |
1373 | * coming back to use it then we will need to flag it as new even if it | |
1374 | * has a disk address. | |
1375 | * | |
1376 | * With sub-block writes into unwritten extents we also need to mark | |
1377 | * the buffer as new so that the unwritten parts of the buffer gets | |
1378 | * correctly zeroed. | |
1da177e4 LT |
1379 | */ |
1380 | if (create && | |
1381 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || | |
549054af DC |
1382 | (offset >= i_size_read(inode)) || |
1383 | (iomap.iomap_flags & (IOMAP_NEW|IOMAP_UNWRITTEN)))) | |
1da177e4 | 1384 | set_buffer_new(bh_result); |
1da177e4 LT |
1385 | |
1386 | if (iomap.iomap_flags & IOMAP_DELAY) { | |
1387 | BUG_ON(direct); | |
1388 | if (create) { | |
1389 | set_buffer_uptodate(bh_result); | |
1390 | set_buffer_mapped(bh_result); | |
1391 | set_buffer_delay(bh_result); | |
1392 | } | |
1393 | } | |
1394 | ||
c2536668 | 1395 | if (direct || size > (1 << inode->i_blkbits)) { |
fdc7ed75 NS |
1396 | ASSERT(iomap.iomap_bsize - iomap.iomap_delta > 0); |
1397 | offset = min_t(xfs_off_t, | |
c2536668 NS |
1398 | iomap.iomap_bsize - iomap.iomap_delta, size); |
1399 | bh_result->b_size = (ssize_t)min_t(xfs_off_t, LONG_MAX, offset); | |
1da177e4 LT |
1400 | } |
1401 | ||
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | int | |
c2536668 | 1406 | xfs_get_blocks( |
1da177e4 LT |
1407 | struct inode *inode, |
1408 | sector_t iblock, | |
1409 | struct buffer_head *bh_result, | |
1410 | int create) | |
1411 | { | |
c2536668 | 1412 | return __xfs_get_blocks(inode, iblock, |
fa30bd05 | 1413 | bh_result, create, 0, BMAPI_WRITE); |
1da177e4 LT |
1414 | } |
1415 | ||
1416 | STATIC int | |
e4c573bb | 1417 | xfs_get_blocks_direct( |
1da177e4 LT |
1418 | struct inode *inode, |
1419 | sector_t iblock, | |
1da177e4 LT |
1420 | struct buffer_head *bh_result, |
1421 | int create) | |
1422 | { | |
c2536668 | 1423 | return __xfs_get_blocks(inode, iblock, |
1d8fa7a2 | 1424 | bh_result, create, 1, BMAPI_WRITE|BMAPI_DIRECT); |
1da177e4 LT |
1425 | } |
1426 | ||
f0973863 | 1427 | STATIC void |
e4c573bb | 1428 | xfs_end_io_direct( |
f0973863 CH |
1429 | struct kiocb *iocb, |
1430 | loff_t offset, | |
1431 | ssize_t size, | |
1432 | void *private) | |
1433 | { | |
1434 | xfs_ioend_t *ioend = iocb->private; | |
1435 | ||
1436 | /* | |
1437 | * Non-NULL private data means we need to issue a transaction to | |
1438 | * convert a range from unwritten to written extents. This needs | |
c41564b5 | 1439 | * to happen from process context but aio+dio I/O completion |
f0973863 | 1440 | * happens from irq context so we need to defer it to a workqueue. |
c41564b5 | 1441 | * This is not necessary for synchronous direct I/O, but we do |
f0973863 CH |
1442 | * it anyway to keep the code uniform and simpler. |
1443 | * | |
e927af90 DC |
1444 | * Well, if only it were that simple. Because synchronous direct I/O |
1445 | * requires extent conversion to occur *before* we return to userspace, | |
1446 | * we have to wait for extent conversion to complete. Look at the | |
1447 | * iocb that has been passed to us to determine if this is AIO or | |
1448 | * not. If it is synchronous, tell xfs_finish_ioend() to kick the | |
1449 | * workqueue and wait for it to complete. | |
1450 | * | |
f0973863 CH |
1451 | * The core direct I/O code might be changed to always call the |
1452 | * completion handler in the future, in which case all this can | |
1453 | * go away. | |
1454 | */ | |
ba87ea69 LM |
1455 | ioend->io_offset = offset; |
1456 | ioend->io_size = size; | |
1457 | if (ioend->io_type == IOMAP_READ) { | |
e927af90 | 1458 | xfs_finish_ioend(ioend, 0); |
ba87ea69 | 1459 | } else if (private && size > 0) { |
e927af90 | 1460 | xfs_finish_ioend(ioend, is_sync_kiocb(iocb)); |
f0973863 | 1461 | } else { |
ba87ea69 LM |
1462 | /* |
1463 | * A direct I/O write ioend starts it's life in unwritten | |
1464 | * state in case they map an unwritten extent. This write | |
1465 | * didn't map an unwritten extent so switch it's completion | |
1466 | * handler. | |
1467 | */ | |
1468 | INIT_WORK(&ioend->io_work, xfs_end_bio_written); | |
e927af90 | 1469 | xfs_finish_ioend(ioend, 0); |
f0973863 CH |
1470 | } |
1471 | ||
1472 | /* | |
c41564b5 | 1473 | * blockdev_direct_IO can return an error even after the I/O |
f0973863 CH |
1474 | * completion handler was called. Thus we need to protect |
1475 | * against double-freeing. | |
1476 | */ | |
1477 | iocb->private = NULL; | |
1478 | } | |
1479 | ||
1da177e4 | 1480 | STATIC ssize_t |
e4c573bb | 1481 | xfs_vm_direct_IO( |
1da177e4 LT |
1482 | int rw, |
1483 | struct kiocb *iocb, | |
1484 | const struct iovec *iov, | |
1485 | loff_t offset, | |
1486 | unsigned long nr_segs) | |
1487 | { | |
1488 | struct file *file = iocb->ki_filp; | |
1489 | struct inode *inode = file->f_mapping->host; | |
6214ed44 | 1490 | struct block_device *bdev; |
f0973863 | 1491 | ssize_t ret; |
1da177e4 | 1492 | |
6214ed44 | 1493 | bdev = xfs_find_bdev_for_inode(XFS_I(inode)); |
1da177e4 | 1494 | |
721259bc | 1495 | if (rw == WRITE) { |
ba87ea69 | 1496 | iocb->private = xfs_alloc_ioend(inode, IOMAP_UNWRITTEN); |
721259bc | 1497 | ret = blockdev_direct_IO_own_locking(rw, iocb, inode, |
6214ed44 | 1498 | bdev, iov, offset, nr_segs, |
721259bc LM |
1499 | xfs_get_blocks_direct, |
1500 | xfs_end_io_direct); | |
1501 | } else { | |
ba87ea69 | 1502 | iocb->private = xfs_alloc_ioend(inode, IOMAP_READ); |
721259bc | 1503 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
6214ed44 | 1504 | bdev, iov, offset, nr_segs, |
721259bc LM |
1505 | xfs_get_blocks_direct, |
1506 | xfs_end_io_direct); | |
1507 | } | |
f0973863 | 1508 | |
8459d86a | 1509 | if (unlikely(ret != -EIOCBQUEUED && iocb->private)) |
f0973863 CH |
1510 | xfs_destroy_ioend(iocb->private); |
1511 | return ret; | |
1da177e4 LT |
1512 | } |
1513 | ||
f51623b2 | 1514 | STATIC int |
d79689c7 | 1515 | xfs_vm_write_begin( |
f51623b2 | 1516 | struct file *file, |
d79689c7 NP |
1517 | struct address_space *mapping, |
1518 | loff_t pos, | |
1519 | unsigned len, | |
1520 | unsigned flags, | |
1521 | struct page **pagep, | |
1522 | void **fsdata) | |
f51623b2 | 1523 | { |
d79689c7 NP |
1524 | *pagep = NULL; |
1525 | return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata, | |
1526 | xfs_get_blocks); | |
f51623b2 | 1527 | } |
1da177e4 LT |
1528 | |
1529 | STATIC sector_t | |
e4c573bb | 1530 | xfs_vm_bmap( |
1da177e4 LT |
1531 | struct address_space *mapping, |
1532 | sector_t block) | |
1533 | { | |
1534 | struct inode *inode = (struct inode *)mapping->host; | |
739bfb2a | 1535 | struct xfs_inode *ip = XFS_I(inode); |
1da177e4 | 1536 | |
cf441eeb | 1537 | xfs_itrace_entry(XFS_I(inode)); |
126468b1 | 1538 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
739bfb2a | 1539 | xfs_flush_pages(ip, (xfs_off_t)0, -1, 0, FI_REMAPF); |
126468b1 | 1540 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
c2536668 | 1541 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
1da177e4 LT |
1542 | } |
1543 | ||
1544 | STATIC int | |
e4c573bb | 1545 | xfs_vm_readpage( |
1da177e4 LT |
1546 | struct file *unused, |
1547 | struct page *page) | |
1548 | { | |
c2536668 | 1549 | return mpage_readpage(page, xfs_get_blocks); |
1da177e4 LT |
1550 | } |
1551 | ||
1552 | STATIC int | |
e4c573bb | 1553 | xfs_vm_readpages( |
1da177e4 LT |
1554 | struct file *unused, |
1555 | struct address_space *mapping, | |
1556 | struct list_head *pages, | |
1557 | unsigned nr_pages) | |
1558 | { | |
c2536668 | 1559 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
1da177e4 LT |
1560 | } |
1561 | ||
2ff28e22 | 1562 | STATIC void |
238f4c54 | 1563 | xfs_vm_invalidatepage( |
bcec2b7f NS |
1564 | struct page *page, |
1565 | unsigned long offset) | |
1566 | { | |
1567 | xfs_page_trace(XFS_INVALIDPAGE_ENTER, | |
1568 | page->mapping->host, page, offset); | |
2ff28e22 | 1569 | block_invalidatepage(page, offset); |
bcec2b7f NS |
1570 | } |
1571 | ||
f5e54d6e | 1572 | const struct address_space_operations xfs_address_space_operations = { |
e4c573bb NS |
1573 | .readpage = xfs_vm_readpage, |
1574 | .readpages = xfs_vm_readpages, | |
1575 | .writepage = xfs_vm_writepage, | |
7d4fb40a | 1576 | .writepages = xfs_vm_writepages, |
1da177e4 | 1577 | .sync_page = block_sync_page, |
238f4c54 NS |
1578 | .releasepage = xfs_vm_releasepage, |
1579 | .invalidatepage = xfs_vm_invalidatepage, | |
d79689c7 NP |
1580 | .write_begin = xfs_vm_write_begin, |
1581 | .write_end = generic_write_end, | |
e4c573bb NS |
1582 | .bmap = xfs_vm_bmap, |
1583 | .direct_IO = xfs_vm_direct_IO, | |
e965f963 | 1584 | .migratepage = buffer_migrate_page, |
1da177e4 | 1585 | }; |