Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
1da177e4 LT |
19 | #include "xfs_log.h" |
20 | #include "xfs_sb.h" | |
a844f451 | 21 | #include "xfs_ag.h" |
1da177e4 | 22 | #include "xfs_trans.h" |
1da177e4 LT |
23 | #include "xfs_mount.h" |
24 | #include "xfs_bmap_btree.h" | |
1da177e4 LT |
25 | #include "xfs_dinode.h" |
26 | #include "xfs_inode.h" | |
281627df | 27 | #include "xfs_inode_item.h" |
a844f451 | 28 | #include "xfs_alloc.h" |
1da177e4 | 29 | #include "xfs_error.h" |
1da177e4 | 30 | #include "xfs_iomap.h" |
739bfb2a | 31 | #include "xfs_vnodeops.h" |
0b1b213f | 32 | #include "xfs_trace.h" |
3ed3a434 | 33 | #include "xfs_bmap.h" |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
1da177e4 | 35 | #include <linux/mpage.h> |
10ce4444 | 36 | #include <linux/pagevec.h> |
1da177e4 LT |
37 | #include <linux/writeback.h> |
38 | ||
0b1b213f | 39 | void |
f51623b2 NS |
40 | xfs_count_page_state( |
41 | struct page *page, | |
42 | int *delalloc, | |
f51623b2 NS |
43 | int *unwritten) |
44 | { | |
45 | struct buffer_head *bh, *head; | |
46 | ||
20cb52eb | 47 | *delalloc = *unwritten = 0; |
f51623b2 NS |
48 | |
49 | bh = head = page_buffers(page); | |
50 | do { | |
20cb52eb | 51 | if (buffer_unwritten(bh)) |
f51623b2 NS |
52 | (*unwritten) = 1; |
53 | else if (buffer_delay(bh)) | |
54 | (*delalloc) = 1; | |
55 | } while ((bh = bh->b_this_page) != head); | |
56 | } | |
57 | ||
6214ed44 CH |
58 | STATIC struct block_device * |
59 | xfs_find_bdev_for_inode( | |
046f1685 | 60 | struct inode *inode) |
6214ed44 | 61 | { |
046f1685 | 62 | struct xfs_inode *ip = XFS_I(inode); |
6214ed44 CH |
63 | struct xfs_mount *mp = ip->i_mount; |
64 | ||
71ddabb9 | 65 | if (XFS_IS_REALTIME_INODE(ip)) |
6214ed44 CH |
66 | return mp->m_rtdev_targp->bt_bdev; |
67 | else | |
68 | return mp->m_ddev_targp->bt_bdev; | |
69 | } | |
70 | ||
f6d6d4fc CH |
71 | /* |
72 | * We're now finished for good with this ioend structure. | |
73 | * Update the page state via the associated buffer_heads, | |
74 | * release holds on the inode and bio, and finally free | |
75 | * up memory. Do not use the ioend after this. | |
76 | */ | |
0829c360 CH |
77 | STATIC void |
78 | xfs_destroy_ioend( | |
79 | xfs_ioend_t *ioend) | |
80 | { | |
f6d6d4fc CH |
81 | struct buffer_head *bh, *next; |
82 | ||
83 | for (bh = ioend->io_buffer_head; bh; bh = next) { | |
84 | next = bh->b_private; | |
7d04a335 | 85 | bh->b_end_io(bh, !ioend->io_error); |
f6d6d4fc | 86 | } |
583fa586 | 87 | |
c859cdd1 | 88 | if (ioend->io_iocb) { |
04f658ee CH |
89 | if (ioend->io_isasync) { |
90 | aio_complete(ioend->io_iocb, ioend->io_error ? | |
91 | ioend->io_error : ioend->io_result, 0); | |
92 | } | |
c859cdd1 CH |
93 | inode_dio_done(ioend->io_inode); |
94 | } | |
4a06fd26 | 95 | |
0829c360 CH |
96 | mempool_free(ioend, xfs_ioend_pool); |
97 | } | |
98 | ||
fc0063c4 CH |
99 | /* |
100 | * Fast and loose check if this write could update the on-disk inode size. | |
101 | */ | |
102 | static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend) | |
103 | { | |
104 | return ioend->io_offset + ioend->io_size > | |
105 | XFS_I(ioend->io_inode)->i_d.di_size; | |
106 | } | |
107 | ||
281627df CH |
108 | STATIC int |
109 | xfs_setfilesize_trans_alloc( | |
110 | struct xfs_ioend *ioend) | |
111 | { | |
112 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; | |
113 | struct xfs_trans *tp; | |
114 | int error; | |
115 | ||
116 | tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); | |
117 | ||
118 | error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0); | |
119 | if (error) { | |
120 | xfs_trans_cancel(tp, 0); | |
121 | return error; | |
122 | } | |
123 | ||
124 | ioend->io_append_trans = tp; | |
125 | ||
d9457dc0 JK |
126 | /* |
127 | * We will pass freeze protection with a transaction. So tell lockdep | |
128 | * we released it. | |
129 | */ | |
130 | rwsem_release(&ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], | |
131 | 1, _THIS_IP_); | |
281627df CH |
132 | /* |
133 | * We hand off the transaction to the completion thread now, so | |
134 | * clear the flag here. | |
135 | */ | |
136 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
137 | return 0; | |
138 | } | |
139 | ||
ba87ea69 | 140 | /* |
2813d682 | 141 | * Update on-disk file size now that data has been written to disk. |
ba87ea69 | 142 | */ |
281627df | 143 | STATIC int |
ba87ea69 | 144 | xfs_setfilesize( |
aa6bf01d | 145 | struct xfs_ioend *ioend) |
ba87ea69 | 146 | { |
aa6bf01d | 147 | struct xfs_inode *ip = XFS_I(ioend->io_inode); |
281627df | 148 | struct xfs_trans *tp = ioend->io_append_trans; |
ba87ea69 | 149 | xfs_fsize_t isize; |
ba87ea69 | 150 | |
281627df CH |
151 | /* |
152 | * The transaction was allocated in the I/O submission thread, | |
153 | * thus we need to mark ourselves as beeing in a transaction | |
154 | * manually. | |
155 | */ | |
156 | current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
157 | ||
aa6bf01d | 158 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
6923e686 | 159 | isize = xfs_new_eof(ip, ioend->io_offset + ioend->io_size); |
281627df CH |
160 | if (!isize) { |
161 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
162 | xfs_trans_cancel(tp, 0); | |
163 | return 0; | |
ba87ea69 LM |
164 | } |
165 | ||
281627df CH |
166 | trace_xfs_setfilesize(ip, ioend->io_offset, ioend->io_size); |
167 | ||
168 | ip->i_d.di_size = isize; | |
169 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
170 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
171 | ||
172 | return xfs_trans_commit(tp, 0); | |
77d7a0c2 DC |
173 | } |
174 | ||
175 | /* | |
209fb87a | 176 | * Schedule IO completion handling on the final put of an ioend. |
fc0063c4 CH |
177 | * |
178 | * If there is no work to do we might as well call it a day and free the | |
179 | * ioend right now. | |
77d7a0c2 DC |
180 | */ |
181 | STATIC void | |
182 | xfs_finish_ioend( | |
209fb87a | 183 | struct xfs_ioend *ioend) |
77d7a0c2 DC |
184 | { |
185 | if (atomic_dec_and_test(&ioend->io_remaining)) { | |
aa6bf01d CH |
186 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
187 | ||
0d882a36 | 188 | if (ioend->io_type == XFS_IO_UNWRITTEN) |
aa6bf01d | 189 | queue_work(mp->m_unwritten_workqueue, &ioend->io_work); |
281627df | 190 | else if (ioend->io_append_trans) |
aa6bf01d | 191 | queue_work(mp->m_data_workqueue, &ioend->io_work); |
fc0063c4 CH |
192 | else |
193 | xfs_destroy_ioend(ioend); | |
77d7a0c2 | 194 | } |
ba87ea69 LM |
195 | } |
196 | ||
0829c360 | 197 | /* |
5ec4fabb | 198 | * IO write completion. |
f6d6d4fc CH |
199 | */ |
200 | STATIC void | |
5ec4fabb | 201 | xfs_end_io( |
77d7a0c2 | 202 | struct work_struct *work) |
0829c360 | 203 | { |
77d7a0c2 DC |
204 | xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work); |
205 | struct xfs_inode *ip = XFS_I(ioend->io_inode); | |
69418932 | 206 | int error = 0; |
ba87ea69 | 207 | |
d9457dc0 JK |
208 | if (ioend->io_append_trans) { |
209 | /* | |
210 | * We've got freeze protection passed with the transaction. | |
211 | * Tell lockdep about it. | |
212 | */ | |
213 | rwsem_acquire_read( | |
214 | &ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], | |
215 | 0, 1, _THIS_IP_); | |
216 | } | |
04f658ee | 217 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
810627d9 | 218 | ioend->io_error = -EIO; |
04f658ee CH |
219 | goto done; |
220 | } | |
221 | if (ioend->io_error) | |
222 | goto done; | |
223 | ||
5ec4fabb CH |
224 | /* |
225 | * For unwritten extents we need to issue transactions to convert a | |
226 | * range to normal written extens after the data I/O has finished. | |
227 | */ | |
0d882a36 | 228 | if (ioend->io_type == XFS_IO_UNWRITTEN) { |
281627df CH |
229 | /* |
230 | * For buffered I/O we never preallocate a transaction when | |
231 | * doing the unwritten extent conversion, but for direct I/O | |
232 | * we do not know if we are converting an unwritten extent | |
233 | * or not at the point where we preallocate the transaction. | |
234 | */ | |
235 | if (ioend->io_append_trans) { | |
236 | ASSERT(ioend->io_isdirect); | |
237 | ||
238 | current_set_flags_nested( | |
239 | &ioend->io_append_trans->t_pflags, PF_FSTRANS); | |
240 | xfs_trans_cancel(ioend->io_append_trans, 0); | |
241 | } | |
242 | ||
5ec4fabb CH |
243 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, |
244 | ioend->io_size); | |
04f658ee CH |
245 | if (error) { |
246 | ioend->io_error = -error; | |
247 | goto done; | |
248 | } | |
281627df CH |
249 | } else if (ioend->io_append_trans) { |
250 | error = xfs_setfilesize(ioend); | |
251 | if (error) | |
252 | ioend->io_error = -error; | |
84803fb7 | 253 | } else { |
281627df | 254 | ASSERT(!xfs_ioend_is_append(ioend)); |
5ec4fabb | 255 | } |
ba87ea69 | 256 | |
04f658ee | 257 | done: |
aa6bf01d | 258 | xfs_destroy_ioend(ioend); |
c626d174 DC |
259 | } |
260 | ||
209fb87a CH |
261 | /* |
262 | * Call IO completion handling in caller context on the final put of an ioend. | |
263 | */ | |
264 | STATIC void | |
265 | xfs_finish_ioend_sync( | |
266 | struct xfs_ioend *ioend) | |
267 | { | |
268 | if (atomic_dec_and_test(&ioend->io_remaining)) | |
269 | xfs_end_io(&ioend->io_work); | |
270 | } | |
271 | ||
0829c360 CH |
272 | /* |
273 | * Allocate and initialise an IO completion structure. | |
274 | * We need to track unwritten extent write completion here initially. | |
275 | * We'll need to extend this for updating the ondisk inode size later | |
276 | * (vs. incore size). | |
277 | */ | |
278 | STATIC xfs_ioend_t * | |
279 | xfs_alloc_ioend( | |
f6d6d4fc CH |
280 | struct inode *inode, |
281 | unsigned int type) | |
0829c360 CH |
282 | { |
283 | xfs_ioend_t *ioend; | |
284 | ||
285 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); | |
286 | ||
287 | /* | |
288 | * Set the count to 1 initially, which will prevent an I/O | |
289 | * completion callback from happening before we have started | |
290 | * all the I/O from calling the completion routine too early. | |
291 | */ | |
292 | atomic_set(&ioend->io_remaining, 1); | |
c859cdd1 | 293 | ioend->io_isasync = 0; |
281627df | 294 | ioend->io_isdirect = 0; |
7d04a335 | 295 | ioend->io_error = 0; |
f6d6d4fc CH |
296 | ioend->io_list = NULL; |
297 | ioend->io_type = type; | |
b677c210 | 298 | ioend->io_inode = inode; |
c1a073bd | 299 | ioend->io_buffer_head = NULL; |
f6d6d4fc | 300 | ioend->io_buffer_tail = NULL; |
0829c360 CH |
301 | ioend->io_offset = 0; |
302 | ioend->io_size = 0; | |
fb511f21 CH |
303 | ioend->io_iocb = NULL; |
304 | ioend->io_result = 0; | |
281627df | 305 | ioend->io_append_trans = NULL; |
0829c360 | 306 | |
5ec4fabb | 307 | INIT_WORK(&ioend->io_work, xfs_end_io); |
0829c360 CH |
308 | return ioend; |
309 | } | |
310 | ||
1da177e4 LT |
311 | STATIC int |
312 | xfs_map_blocks( | |
313 | struct inode *inode, | |
314 | loff_t offset, | |
207d0416 | 315 | struct xfs_bmbt_irec *imap, |
a206c817 CH |
316 | int type, |
317 | int nonblocking) | |
1da177e4 | 318 | { |
a206c817 CH |
319 | struct xfs_inode *ip = XFS_I(inode); |
320 | struct xfs_mount *mp = ip->i_mount; | |
ed1e7b7e | 321 | ssize_t count = 1 << inode->i_blkbits; |
a206c817 CH |
322 | xfs_fileoff_t offset_fsb, end_fsb; |
323 | int error = 0; | |
a206c817 CH |
324 | int bmapi_flags = XFS_BMAPI_ENTIRE; |
325 | int nimaps = 1; | |
326 | ||
327 | if (XFS_FORCED_SHUTDOWN(mp)) | |
328 | return -XFS_ERROR(EIO); | |
329 | ||
0d882a36 | 330 | if (type == XFS_IO_UNWRITTEN) |
a206c817 | 331 | bmapi_flags |= XFS_BMAPI_IGSTATE; |
8ff2957d CH |
332 | |
333 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { | |
334 | if (nonblocking) | |
335 | return -XFS_ERROR(EAGAIN); | |
336 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
a206c817 CH |
337 | } |
338 | ||
8ff2957d CH |
339 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
340 | (ip->i_df.if_flags & XFS_IFEXTENTS)); | |
d2c28191 | 341 | ASSERT(offset <= mp->m_super->s_maxbytes); |
8ff2957d | 342 | |
d2c28191 DC |
343 | if (offset + count > mp->m_super->s_maxbytes) |
344 | count = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
345 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
346 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
5c8ed202 DC |
347 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
348 | imap, &nimaps, bmapi_flags); | |
8ff2957d | 349 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
a206c817 | 350 | |
8ff2957d CH |
351 | if (error) |
352 | return -XFS_ERROR(error); | |
a206c817 | 353 | |
0d882a36 | 354 | if (type == XFS_IO_DELALLOC && |
8ff2957d | 355 | (!nimaps || isnullstartblock(imap->br_startblock))) { |
a206c817 CH |
356 | error = xfs_iomap_write_allocate(ip, offset, count, imap); |
357 | if (!error) | |
358 | trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); | |
8ff2957d | 359 | return -XFS_ERROR(error); |
a206c817 CH |
360 | } |
361 | ||
8ff2957d | 362 | #ifdef DEBUG |
0d882a36 | 363 | if (type == XFS_IO_UNWRITTEN) { |
8ff2957d CH |
364 | ASSERT(nimaps); |
365 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); | |
366 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
367 | } | |
368 | #endif | |
369 | if (nimaps) | |
370 | trace_xfs_map_blocks_found(ip, offset, count, type, imap); | |
371 | return 0; | |
1da177e4 LT |
372 | } |
373 | ||
b8f82a4a | 374 | STATIC int |
558e6891 | 375 | xfs_imap_valid( |
8699bb0a | 376 | struct inode *inode, |
207d0416 | 377 | struct xfs_bmbt_irec *imap, |
558e6891 | 378 | xfs_off_t offset) |
1da177e4 | 379 | { |
558e6891 | 380 | offset >>= inode->i_blkbits; |
8699bb0a | 381 | |
558e6891 CH |
382 | return offset >= imap->br_startoff && |
383 | offset < imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
384 | } |
385 | ||
f6d6d4fc CH |
386 | /* |
387 | * BIO completion handler for buffered IO. | |
388 | */ | |
782e3b3b | 389 | STATIC void |
f6d6d4fc CH |
390 | xfs_end_bio( |
391 | struct bio *bio, | |
f6d6d4fc CH |
392 | int error) |
393 | { | |
394 | xfs_ioend_t *ioend = bio->bi_private; | |
395 | ||
f6d6d4fc | 396 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
7d04a335 | 397 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
f6d6d4fc CH |
398 | |
399 | /* Toss bio and pass work off to an xfsdatad thread */ | |
f6d6d4fc CH |
400 | bio->bi_private = NULL; |
401 | bio->bi_end_io = NULL; | |
f6d6d4fc | 402 | bio_put(bio); |
7d04a335 | 403 | |
209fb87a | 404 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
405 | } |
406 | ||
407 | STATIC void | |
408 | xfs_submit_ioend_bio( | |
06342cf8 CH |
409 | struct writeback_control *wbc, |
410 | xfs_ioend_t *ioend, | |
411 | struct bio *bio) | |
f6d6d4fc CH |
412 | { |
413 | atomic_inc(&ioend->io_remaining); | |
f6d6d4fc CH |
414 | bio->bi_private = ioend; |
415 | bio->bi_end_io = xfs_end_bio; | |
721a9602 | 416 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio); |
f6d6d4fc CH |
417 | } |
418 | ||
419 | STATIC struct bio * | |
420 | xfs_alloc_ioend_bio( | |
421 | struct buffer_head *bh) | |
422 | { | |
f6d6d4fc | 423 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
221cb251 | 424 | struct bio *bio = bio_alloc(GFP_NOIO, nvecs); |
f6d6d4fc CH |
425 | |
426 | ASSERT(bio->bi_private == NULL); | |
427 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); | |
428 | bio->bi_bdev = bh->b_bdev; | |
f6d6d4fc CH |
429 | return bio; |
430 | } | |
431 | ||
432 | STATIC void | |
433 | xfs_start_buffer_writeback( | |
434 | struct buffer_head *bh) | |
435 | { | |
436 | ASSERT(buffer_mapped(bh)); | |
437 | ASSERT(buffer_locked(bh)); | |
438 | ASSERT(!buffer_delay(bh)); | |
439 | ASSERT(!buffer_unwritten(bh)); | |
440 | ||
441 | mark_buffer_async_write(bh); | |
442 | set_buffer_uptodate(bh); | |
443 | clear_buffer_dirty(bh); | |
444 | } | |
445 | ||
446 | STATIC void | |
447 | xfs_start_page_writeback( | |
448 | struct page *page, | |
f6d6d4fc CH |
449 | int clear_dirty, |
450 | int buffers) | |
451 | { | |
452 | ASSERT(PageLocked(page)); | |
453 | ASSERT(!PageWriteback(page)); | |
f6d6d4fc | 454 | if (clear_dirty) |
92132021 DC |
455 | clear_page_dirty_for_io(page); |
456 | set_page_writeback(page); | |
f6d6d4fc | 457 | unlock_page(page); |
1f7decf6 FW |
458 | /* If no buffers on the page are to be written, finish it here */ |
459 | if (!buffers) | |
f6d6d4fc | 460 | end_page_writeback(page); |
f6d6d4fc CH |
461 | } |
462 | ||
463 | static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh) | |
464 | { | |
465 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
466 | } | |
467 | ||
468 | /* | |
d88992f6 DC |
469 | * Submit all of the bios for all of the ioends we have saved up, covering the |
470 | * initial writepage page and also any probed pages. | |
471 | * | |
472 | * Because we may have multiple ioends spanning a page, we need to start | |
473 | * writeback on all the buffers before we submit them for I/O. If we mark the | |
474 | * buffers as we got, then we can end up with a page that only has buffers | |
475 | * marked async write and I/O complete on can occur before we mark the other | |
476 | * buffers async write. | |
477 | * | |
478 | * The end result of this is that we trip a bug in end_page_writeback() because | |
479 | * we call it twice for the one page as the code in end_buffer_async_write() | |
480 | * assumes that all buffers on the page are started at the same time. | |
481 | * | |
482 | * The fix is two passes across the ioend list - one to start writeback on the | |
c41564b5 | 483 | * buffer_heads, and then submit them for I/O on the second pass. |
7bf7f352 DC |
484 | * |
485 | * If @fail is non-zero, it means that we have a situation where some part of | |
486 | * the submission process has failed after we have marked paged for writeback | |
487 | * and unlocked them. In this situation, we need to fail the ioend chain rather | |
488 | * than submit it to IO. This typically only happens on a filesystem shutdown. | |
f6d6d4fc CH |
489 | */ |
490 | STATIC void | |
491 | xfs_submit_ioend( | |
06342cf8 | 492 | struct writeback_control *wbc, |
7bf7f352 DC |
493 | xfs_ioend_t *ioend, |
494 | int fail) | |
f6d6d4fc | 495 | { |
d88992f6 | 496 | xfs_ioend_t *head = ioend; |
f6d6d4fc CH |
497 | xfs_ioend_t *next; |
498 | struct buffer_head *bh; | |
499 | struct bio *bio; | |
500 | sector_t lastblock = 0; | |
501 | ||
d88992f6 DC |
502 | /* Pass 1 - start writeback */ |
503 | do { | |
504 | next = ioend->io_list; | |
221cb251 | 505 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) |
d88992f6 | 506 | xfs_start_buffer_writeback(bh); |
d88992f6 DC |
507 | } while ((ioend = next) != NULL); |
508 | ||
509 | /* Pass 2 - submit I/O */ | |
510 | ioend = head; | |
f6d6d4fc CH |
511 | do { |
512 | next = ioend->io_list; | |
513 | bio = NULL; | |
514 | ||
7bf7f352 DC |
515 | /* |
516 | * If we are failing the IO now, just mark the ioend with an | |
517 | * error and finish it. This will run IO completion immediately | |
518 | * as there is only one reference to the ioend at this point in | |
519 | * time. | |
520 | */ | |
521 | if (fail) { | |
522 | ioend->io_error = -fail; | |
523 | xfs_finish_ioend(ioend); | |
524 | continue; | |
525 | } | |
526 | ||
f6d6d4fc | 527 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { |
f6d6d4fc CH |
528 | |
529 | if (!bio) { | |
530 | retry: | |
531 | bio = xfs_alloc_ioend_bio(bh); | |
532 | } else if (bh->b_blocknr != lastblock + 1) { | |
06342cf8 | 533 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
534 | goto retry; |
535 | } | |
536 | ||
537 | if (bio_add_buffer(bio, bh) != bh->b_size) { | |
06342cf8 | 538 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
539 | goto retry; |
540 | } | |
541 | ||
542 | lastblock = bh->b_blocknr; | |
543 | } | |
544 | if (bio) | |
06342cf8 | 545 | xfs_submit_ioend_bio(wbc, ioend, bio); |
209fb87a | 546 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
547 | } while ((ioend = next) != NULL); |
548 | } | |
549 | ||
550 | /* | |
551 | * Cancel submission of all buffer_heads so far in this endio. | |
552 | * Toss the endio too. Only ever called for the initial page | |
553 | * in a writepage request, so only ever one page. | |
554 | */ | |
555 | STATIC void | |
556 | xfs_cancel_ioend( | |
557 | xfs_ioend_t *ioend) | |
558 | { | |
559 | xfs_ioend_t *next; | |
560 | struct buffer_head *bh, *next_bh; | |
561 | ||
562 | do { | |
563 | next = ioend->io_list; | |
564 | bh = ioend->io_buffer_head; | |
565 | do { | |
566 | next_bh = bh->b_private; | |
567 | clear_buffer_async_write(bh); | |
568 | unlock_buffer(bh); | |
569 | } while ((bh = next_bh) != NULL); | |
570 | ||
f6d6d4fc CH |
571 | mempool_free(ioend, xfs_ioend_pool); |
572 | } while ((ioend = next) != NULL); | |
573 | } | |
574 | ||
575 | /* | |
576 | * Test to see if we've been building up a completion structure for | |
577 | * earlier buffers -- if so, we try to append to this ioend if we | |
578 | * can, otherwise we finish off any current ioend and start another. | |
579 | * Return true if we've finished the given ioend. | |
580 | */ | |
581 | STATIC void | |
582 | xfs_add_to_ioend( | |
583 | struct inode *inode, | |
584 | struct buffer_head *bh, | |
7336cea8 | 585 | xfs_off_t offset, |
f6d6d4fc CH |
586 | unsigned int type, |
587 | xfs_ioend_t **result, | |
588 | int need_ioend) | |
589 | { | |
590 | xfs_ioend_t *ioend = *result; | |
591 | ||
592 | if (!ioend || need_ioend || type != ioend->io_type) { | |
593 | xfs_ioend_t *previous = *result; | |
f6d6d4fc | 594 | |
f6d6d4fc CH |
595 | ioend = xfs_alloc_ioend(inode, type); |
596 | ioend->io_offset = offset; | |
597 | ioend->io_buffer_head = bh; | |
598 | ioend->io_buffer_tail = bh; | |
599 | if (previous) | |
600 | previous->io_list = ioend; | |
601 | *result = ioend; | |
602 | } else { | |
603 | ioend->io_buffer_tail->b_private = bh; | |
604 | ioend->io_buffer_tail = bh; | |
605 | } | |
606 | ||
607 | bh->b_private = NULL; | |
608 | ioend->io_size += bh->b_size; | |
609 | } | |
610 | ||
87cbc49c NS |
611 | STATIC void |
612 | xfs_map_buffer( | |
046f1685 | 613 | struct inode *inode, |
87cbc49c | 614 | struct buffer_head *bh, |
207d0416 | 615 | struct xfs_bmbt_irec *imap, |
046f1685 | 616 | xfs_off_t offset) |
87cbc49c NS |
617 | { |
618 | sector_t bn; | |
8699bb0a | 619 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
207d0416 CH |
620 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff); |
621 | xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), imap->br_startblock); | |
87cbc49c | 622 | |
207d0416 CH |
623 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
624 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
87cbc49c | 625 | |
e513182d | 626 | bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) + |
8699bb0a | 627 | ((offset - iomap_offset) >> inode->i_blkbits); |
87cbc49c | 628 | |
046f1685 | 629 | ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode))); |
87cbc49c NS |
630 | |
631 | bh->b_blocknr = bn; | |
632 | set_buffer_mapped(bh); | |
633 | } | |
634 | ||
1da177e4 LT |
635 | STATIC void |
636 | xfs_map_at_offset( | |
046f1685 | 637 | struct inode *inode, |
1da177e4 | 638 | struct buffer_head *bh, |
207d0416 | 639 | struct xfs_bmbt_irec *imap, |
046f1685 | 640 | xfs_off_t offset) |
1da177e4 | 641 | { |
207d0416 CH |
642 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
643 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
1da177e4 | 644 | |
207d0416 | 645 | xfs_map_buffer(inode, bh, imap, offset); |
1da177e4 LT |
646 | set_buffer_mapped(bh); |
647 | clear_buffer_delay(bh); | |
f6d6d4fc | 648 | clear_buffer_unwritten(bh); |
1da177e4 LT |
649 | } |
650 | ||
1da177e4 | 651 | /* |
10ce4444 CH |
652 | * Test if a given page is suitable for writing as part of an unwritten |
653 | * or delayed allocate extent. | |
1da177e4 | 654 | */ |
10ce4444 | 655 | STATIC int |
6ffc4db5 | 656 | xfs_check_page_type( |
10ce4444 | 657 | struct page *page, |
f6d6d4fc | 658 | unsigned int type) |
1da177e4 | 659 | { |
1da177e4 | 660 | if (PageWriteback(page)) |
10ce4444 | 661 | return 0; |
1da177e4 LT |
662 | |
663 | if (page->mapping && page_has_buffers(page)) { | |
664 | struct buffer_head *bh, *head; | |
665 | int acceptable = 0; | |
666 | ||
667 | bh = head = page_buffers(page); | |
668 | do { | |
f6d6d4fc | 669 | if (buffer_unwritten(bh)) |
0d882a36 | 670 | acceptable += (type == XFS_IO_UNWRITTEN); |
f6d6d4fc | 671 | else if (buffer_delay(bh)) |
0d882a36 | 672 | acceptable += (type == XFS_IO_DELALLOC); |
2ddee844 | 673 | else if (buffer_dirty(bh) && buffer_mapped(bh)) |
0d882a36 | 674 | acceptable += (type == XFS_IO_OVERWRITE); |
f6d6d4fc | 675 | else |
1da177e4 | 676 | break; |
1da177e4 LT |
677 | } while ((bh = bh->b_this_page) != head); |
678 | ||
679 | if (acceptable) | |
10ce4444 | 680 | return 1; |
1da177e4 LT |
681 | } |
682 | ||
10ce4444 | 683 | return 0; |
1da177e4 LT |
684 | } |
685 | ||
1da177e4 LT |
686 | /* |
687 | * Allocate & map buffers for page given the extent map. Write it out. | |
688 | * except for the original page of a writepage, this is called on | |
689 | * delalloc/unwritten pages only, for the original page it is possible | |
690 | * that the page has no mapping at all. | |
691 | */ | |
f6d6d4fc | 692 | STATIC int |
1da177e4 LT |
693 | xfs_convert_page( |
694 | struct inode *inode, | |
695 | struct page *page, | |
10ce4444 | 696 | loff_t tindex, |
207d0416 | 697 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 698 | xfs_ioend_t **ioendp, |
2fa24f92 | 699 | struct writeback_control *wbc) |
1da177e4 | 700 | { |
f6d6d4fc | 701 | struct buffer_head *bh, *head; |
9260dc6b CH |
702 | xfs_off_t end_offset; |
703 | unsigned long p_offset; | |
f6d6d4fc | 704 | unsigned int type; |
24e17b5f | 705 | int len, page_dirty; |
f6d6d4fc | 706 | int count = 0, done = 0, uptodate = 1; |
9260dc6b | 707 | xfs_off_t offset = page_offset(page); |
1da177e4 | 708 | |
10ce4444 CH |
709 | if (page->index != tindex) |
710 | goto fail; | |
529ae9aa | 711 | if (!trylock_page(page)) |
10ce4444 CH |
712 | goto fail; |
713 | if (PageWriteback(page)) | |
714 | goto fail_unlock_page; | |
715 | if (page->mapping != inode->i_mapping) | |
716 | goto fail_unlock_page; | |
6ffc4db5 | 717 | if (!xfs_check_page_type(page, (*ioendp)->io_type)) |
10ce4444 CH |
718 | goto fail_unlock_page; |
719 | ||
24e17b5f NS |
720 | /* |
721 | * page_dirty is initially a count of buffers on the page before | |
c41564b5 | 722 | * EOF and is decremented as we move each into a cleanable state. |
9260dc6b CH |
723 | * |
724 | * Derivation: | |
725 | * | |
726 | * End offset is the highest offset that this page should represent. | |
727 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
728 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
729 | * hence give us the correct page_dirty count. On any other page, | |
730 | * it will be zero and in that case we need page_dirty to be the | |
731 | * count of buffers on the page. | |
24e17b5f | 732 | */ |
9260dc6b CH |
733 | end_offset = min_t(unsigned long long, |
734 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, | |
735 | i_size_read(inode)); | |
736 | ||
24e17b5f | 737 | len = 1 << inode->i_blkbits; |
9260dc6b CH |
738 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
739 | PAGE_CACHE_SIZE); | |
740 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
741 | page_dirty = p_offset / len; | |
24e17b5f | 742 | |
1da177e4 LT |
743 | bh = head = page_buffers(page); |
744 | do { | |
9260dc6b | 745 | if (offset >= end_offset) |
1da177e4 | 746 | break; |
f6d6d4fc CH |
747 | if (!buffer_uptodate(bh)) |
748 | uptodate = 0; | |
749 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { | |
750 | done = 1; | |
1da177e4 | 751 | continue; |
f6d6d4fc CH |
752 | } |
753 | ||
2fa24f92 CH |
754 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
755 | buffer_mapped(bh)) { | |
9260dc6b | 756 | if (buffer_unwritten(bh)) |
0d882a36 | 757 | type = XFS_IO_UNWRITTEN; |
2fa24f92 | 758 | else if (buffer_delay(bh)) |
0d882a36 | 759 | type = XFS_IO_DELALLOC; |
2fa24f92 | 760 | else |
0d882a36 | 761 | type = XFS_IO_OVERWRITE; |
9260dc6b | 762 | |
558e6891 | 763 | if (!xfs_imap_valid(inode, imap, offset)) { |
f6d6d4fc | 764 | done = 1; |
9260dc6b CH |
765 | continue; |
766 | } | |
767 | ||
ecff71e6 | 768 | lock_buffer(bh); |
0d882a36 | 769 | if (type != XFS_IO_OVERWRITE) |
2fa24f92 | 770 | xfs_map_at_offset(inode, bh, imap, offset); |
89f3b363 CH |
771 | xfs_add_to_ioend(inode, bh, offset, type, |
772 | ioendp, done); | |
773 | ||
9260dc6b CH |
774 | page_dirty--; |
775 | count++; | |
776 | } else { | |
2fa24f92 | 777 | done = 1; |
1da177e4 | 778 | } |
7336cea8 | 779 | } while (offset += len, (bh = bh->b_this_page) != head); |
1da177e4 | 780 | |
f6d6d4fc CH |
781 | if (uptodate && bh == head) |
782 | SetPageUptodate(page); | |
783 | ||
89f3b363 | 784 | if (count) { |
efceab1d DC |
785 | if (--wbc->nr_to_write <= 0 && |
786 | wbc->sync_mode == WB_SYNC_NONE) | |
89f3b363 | 787 | done = 1; |
1da177e4 | 788 | } |
89f3b363 | 789 | xfs_start_page_writeback(page, !page_dirty, count); |
f6d6d4fc CH |
790 | |
791 | return done; | |
10ce4444 CH |
792 | fail_unlock_page: |
793 | unlock_page(page); | |
794 | fail: | |
795 | return 1; | |
1da177e4 LT |
796 | } |
797 | ||
798 | /* | |
799 | * Convert & write out a cluster of pages in the same extent as defined | |
800 | * by mp and following the start page. | |
801 | */ | |
802 | STATIC void | |
803 | xfs_cluster_write( | |
804 | struct inode *inode, | |
805 | pgoff_t tindex, | |
207d0416 | 806 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 807 | xfs_ioend_t **ioendp, |
1da177e4 | 808 | struct writeback_control *wbc, |
1da177e4 LT |
809 | pgoff_t tlast) |
810 | { | |
10ce4444 CH |
811 | struct pagevec pvec; |
812 | int done = 0, i; | |
1da177e4 | 813 | |
10ce4444 CH |
814 | pagevec_init(&pvec, 0); |
815 | while (!done && tindex <= tlast) { | |
816 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
817 | ||
818 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
1da177e4 | 819 | break; |
10ce4444 CH |
820 | |
821 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
822 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, | |
2fa24f92 | 823 | imap, ioendp, wbc); |
10ce4444 CH |
824 | if (done) |
825 | break; | |
826 | } | |
827 | ||
828 | pagevec_release(&pvec); | |
829 | cond_resched(); | |
1da177e4 LT |
830 | } |
831 | } | |
832 | ||
3ed3a434 DC |
833 | STATIC void |
834 | xfs_vm_invalidatepage( | |
835 | struct page *page, | |
836 | unsigned long offset) | |
837 | { | |
838 | trace_xfs_invalidatepage(page->mapping->host, page, offset); | |
839 | block_invalidatepage(page, offset); | |
840 | } | |
841 | ||
842 | /* | |
843 | * If the page has delalloc buffers on it, we need to punch them out before we | |
844 | * invalidate the page. If we don't, we leave a stale delalloc mapping on the | |
845 | * inode that can trip a BUG() in xfs_get_blocks() later on if a direct IO read | |
846 | * is done on that same region - the delalloc extent is returned when none is | |
847 | * supposed to be there. | |
848 | * | |
849 | * We prevent this by truncating away the delalloc regions on the page before | |
850 | * invalidating it. Because they are delalloc, we can do this without needing a | |
851 | * transaction. Indeed - if we get ENOSPC errors, we have to be able to do this | |
852 | * truncation without a transaction as there is no space left for block | |
853 | * reservation (typically why we see a ENOSPC in writeback). | |
854 | * | |
855 | * This is not a performance critical path, so for now just do the punching a | |
856 | * buffer head at a time. | |
857 | */ | |
858 | STATIC void | |
859 | xfs_aops_discard_page( | |
860 | struct page *page) | |
861 | { | |
862 | struct inode *inode = page->mapping->host; | |
863 | struct xfs_inode *ip = XFS_I(inode); | |
864 | struct buffer_head *bh, *head; | |
865 | loff_t offset = page_offset(page); | |
3ed3a434 | 866 | |
0d882a36 | 867 | if (!xfs_check_page_type(page, XFS_IO_DELALLOC)) |
3ed3a434 DC |
868 | goto out_invalidate; |
869 | ||
e8c3753c DC |
870 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
871 | goto out_invalidate; | |
872 | ||
4f10700a | 873 | xfs_alert(ip->i_mount, |
3ed3a434 DC |
874 | "page discard on page %p, inode 0x%llx, offset %llu.", |
875 | page, ip->i_ino, offset); | |
876 | ||
877 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
878 | bh = head = page_buffers(page); | |
879 | do { | |
3ed3a434 | 880 | int error; |
c726de44 | 881 | xfs_fileoff_t start_fsb; |
3ed3a434 DC |
882 | |
883 | if (!buffer_delay(bh)) | |
884 | goto next_buffer; | |
885 | ||
c726de44 DC |
886 | start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); |
887 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1); | |
3ed3a434 DC |
888 | if (error) { |
889 | /* something screwed, just bail */ | |
e8c3753c | 890 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
4f10700a | 891 | xfs_alert(ip->i_mount, |
3ed3a434 | 892 | "page discard unable to remove delalloc mapping."); |
e8c3753c | 893 | } |
3ed3a434 DC |
894 | break; |
895 | } | |
896 | next_buffer: | |
c726de44 | 897 | offset += 1 << inode->i_blkbits; |
3ed3a434 DC |
898 | |
899 | } while ((bh = bh->b_this_page) != head); | |
900 | ||
901 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
902 | out_invalidate: | |
903 | xfs_vm_invalidatepage(page, 0); | |
904 | return; | |
905 | } | |
906 | ||
1da177e4 | 907 | /* |
89f3b363 CH |
908 | * Write out a dirty page. |
909 | * | |
910 | * For delalloc space on the page we need to allocate space and flush it. | |
911 | * For unwritten space on the page we need to start the conversion to | |
912 | * regular allocated space. | |
89f3b363 | 913 | * For any other dirty buffer heads on the page we should flush them. |
1da177e4 | 914 | */ |
1da177e4 | 915 | STATIC int |
89f3b363 CH |
916 | xfs_vm_writepage( |
917 | struct page *page, | |
918 | struct writeback_control *wbc) | |
1da177e4 | 919 | { |
89f3b363 | 920 | struct inode *inode = page->mapping->host; |
f6d6d4fc | 921 | struct buffer_head *bh, *head; |
207d0416 | 922 | struct xfs_bmbt_irec imap; |
f6d6d4fc | 923 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
1da177e4 | 924 | loff_t offset; |
f6d6d4fc | 925 | unsigned int type; |
1da177e4 | 926 | __uint64_t end_offset; |
bd1556a1 | 927 | pgoff_t end_index, last_index; |
ed1e7b7e | 928 | ssize_t len; |
a206c817 | 929 | int err, imap_valid = 0, uptodate = 1; |
89f3b363 | 930 | int count = 0; |
a206c817 | 931 | int nonblocking = 0; |
89f3b363 CH |
932 | |
933 | trace_xfs_writepage(inode, page, 0); | |
934 | ||
20cb52eb CH |
935 | ASSERT(page_has_buffers(page)); |
936 | ||
89f3b363 CH |
937 | /* |
938 | * Refuse to write the page out if we are called from reclaim context. | |
939 | * | |
d4f7a5cb CH |
940 | * This avoids stack overflows when called from deeply used stacks in |
941 | * random callers for direct reclaim or memcg reclaim. We explicitly | |
942 | * allow reclaim from kswapd as the stack usage there is relatively low. | |
89f3b363 | 943 | * |
94054fa3 MG |
944 | * This should never happen except in the case of a VM regression so |
945 | * warn about it. | |
89f3b363 | 946 | */ |
94054fa3 MG |
947 | if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == |
948 | PF_MEMALLOC)) | |
b5420f23 | 949 | goto redirty; |
1da177e4 | 950 | |
89f3b363 | 951 | /* |
680a647b CH |
952 | * Given that we do not allow direct reclaim to call us, we should |
953 | * never be called while in a filesystem transaction. | |
89f3b363 | 954 | */ |
680a647b | 955 | if (WARN_ON(current->flags & PF_FSTRANS)) |
b5420f23 | 956 | goto redirty; |
89f3b363 | 957 | |
1da177e4 LT |
958 | /* Is this page beyond the end of the file? */ |
959 | offset = i_size_read(inode); | |
960 | end_index = offset >> PAGE_CACHE_SHIFT; | |
961 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; | |
962 | if (page->index >= end_index) { | |
6b7a03f0 CH |
963 | unsigned offset_into_page = offset & (PAGE_CACHE_SIZE - 1); |
964 | ||
965 | /* | |
966 | * Just skip the page if it is fully outside i_size, e.g. due | |
967 | * to a truncate operation that is in progress. | |
968 | */ | |
969 | if (page->index >= end_index + 1 || offset_into_page == 0) { | |
89f3b363 | 970 | unlock_page(page); |
19d5bcf3 | 971 | return 0; |
1da177e4 | 972 | } |
6b7a03f0 CH |
973 | |
974 | /* | |
975 | * The page straddles i_size. It must be zeroed out on each | |
976 | * and every writepage invocation because it may be mmapped. | |
977 | * "A file is mapped in multiples of the page size. For a file | |
978 | * that is not a multiple of the page size, the remaining | |
979 | * memory is zeroed when mapped, and writes to that region are | |
980 | * not written out to the file." | |
981 | */ | |
982 | zero_user_segment(page, offset_into_page, PAGE_CACHE_SIZE); | |
1da177e4 LT |
983 | } |
984 | ||
f6d6d4fc | 985 | end_offset = min_t(unsigned long long, |
20cb52eb CH |
986 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, |
987 | offset); | |
24e17b5f | 988 | len = 1 << inode->i_blkbits; |
24e17b5f | 989 | |
24e17b5f | 990 | bh = head = page_buffers(page); |
f6d6d4fc | 991 | offset = page_offset(page); |
0d882a36 | 992 | type = XFS_IO_OVERWRITE; |
a206c817 | 993 | |
dbcdde3e | 994 | if (wbc->sync_mode == WB_SYNC_NONE) |
a206c817 | 995 | nonblocking = 1; |
f6d6d4fc | 996 | |
1da177e4 | 997 | do { |
6ac7248e CH |
998 | int new_ioend = 0; |
999 | ||
1da177e4 LT |
1000 | if (offset >= end_offset) |
1001 | break; | |
1002 | if (!buffer_uptodate(bh)) | |
1003 | uptodate = 0; | |
1da177e4 | 1004 | |
3d9b02e3 | 1005 | /* |
ece413f5 CH |
1006 | * set_page_dirty dirties all buffers in a page, independent |
1007 | * of their state. The dirty state however is entirely | |
1008 | * meaningless for holes (!mapped && uptodate), so skip | |
1009 | * buffers covering holes here. | |
3d9b02e3 ES |
1010 | */ |
1011 | if (!buffer_mapped(bh) && buffer_uptodate(bh)) { | |
3d9b02e3 ES |
1012 | imap_valid = 0; |
1013 | continue; | |
1014 | } | |
1015 | ||
aeea1b1f | 1016 | if (buffer_unwritten(bh)) { |
0d882a36 AR |
1017 | if (type != XFS_IO_UNWRITTEN) { |
1018 | type = XFS_IO_UNWRITTEN; | |
aeea1b1f | 1019 | imap_valid = 0; |
1da177e4 | 1020 | } |
aeea1b1f | 1021 | } else if (buffer_delay(bh)) { |
0d882a36 AR |
1022 | if (type != XFS_IO_DELALLOC) { |
1023 | type = XFS_IO_DELALLOC; | |
aeea1b1f | 1024 | imap_valid = 0; |
1da177e4 | 1025 | } |
89f3b363 | 1026 | } else if (buffer_uptodate(bh)) { |
0d882a36 AR |
1027 | if (type != XFS_IO_OVERWRITE) { |
1028 | type = XFS_IO_OVERWRITE; | |
85da94c6 CH |
1029 | imap_valid = 0; |
1030 | } | |
aeea1b1f | 1031 | } else { |
7d0fa3ec | 1032 | if (PageUptodate(page)) |
aeea1b1f | 1033 | ASSERT(buffer_mapped(bh)); |
7d0fa3ec AR |
1034 | /* |
1035 | * This buffer is not uptodate and will not be | |
1036 | * written to disk. Ensure that we will put any | |
1037 | * subsequent writeable buffers into a new | |
1038 | * ioend. | |
1039 | */ | |
1040 | imap_valid = 0; | |
aeea1b1f CH |
1041 | continue; |
1042 | } | |
d5cb48aa | 1043 | |
aeea1b1f CH |
1044 | if (imap_valid) |
1045 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1046 | if (!imap_valid) { | |
1047 | /* | |
1048 | * If we didn't have a valid mapping then we need to | |
1049 | * put the new mapping into a separate ioend structure. | |
1050 | * This ensures non-contiguous extents always have | |
1051 | * separate ioends, which is particularly important | |
1052 | * for unwritten extent conversion at I/O completion | |
1053 | * time. | |
1054 | */ | |
1055 | new_ioend = 1; | |
1056 | err = xfs_map_blocks(inode, offset, &imap, type, | |
1057 | nonblocking); | |
1058 | if (err) | |
1059 | goto error; | |
1060 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1061 | } | |
1062 | if (imap_valid) { | |
ecff71e6 | 1063 | lock_buffer(bh); |
0d882a36 | 1064 | if (type != XFS_IO_OVERWRITE) |
aeea1b1f CH |
1065 | xfs_map_at_offset(inode, bh, &imap, offset); |
1066 | xfs_add_to_ioend(inode, bh, offset, type, &ioend, | |
1067 | new_ioend); | |
1068 | count++; | |
1da177e4 | 1069 | } |
f6d6d4fc CH |
1070 | |
1071 | if (!iohead) | |
1072 | iohead = ioend; | |
1073 | ||
1074 | } while (offset += len, ((bh = bh->b_this_page) != head)); | |
1da177e4 LT |
1075 | |
1076 | if (uptodate && bh == head) | |
1077 | SetPageUptodate(page); | |
1078 | ||
89f3b363 | 1079 | xfs_start_page_writeback(page, 1, count); |
1da177e4 | 1080 | |
7bf7f352 DC |
1081 | /* if there is no IO to be submitted for this page, we are done */ |
1082 | if (!ioend) | |
1083 | return 0; | |
1084 | ||
1085 | ASSERT(iohead); | |
1086 | ||
1087 | /* | |
1088 | * Any errors from this point onwards need tobe reported through the IO | |
1089 | * completion path as we have marked the initial page as under writeback | |
1090 | * and unlocked it. | |
1091 | */ | |
1092 | if (imap_valid) { | |
bd1556a1 CH |
1093 | xfs_off_t end_index; |
1094 | ||
1095 | end_index = imap.br_startoff + imap.br_blockcount; | |
1096 | ||
1097 | /* to bytes */ | |
1098 | end_index <<= inode->i_blkbits; | |
1099 | ||
1100 | /* to pages */ | |
1101 | end_index = (end_index - 1) >> PAGE_CACHE_SHIFT; | |
1102 | ||
1103 | /* check against file size */ | |
1104 | if (end_index > last_index) | |
1105 | end_index = last_index; | |
8699bb0a | 1106 | |
207d0416 | 1107 | xfs_cluster_write(inode, page->index + 1, &imap, &ioend, |
2fa24f92 | 1108 | wbc, end_index); |
1da177e4 LT |
1109 | } |
1110 | ||
281627df | 1111 | |
7bf7f352 DC |
1112 | /* |
1113 | * Reserve log space if we might write beyond the on-disk inode size. | |
1114 | */ | |
1115 | err = 0; | |
1116 | if (ioend->io_type != XFS_IO_UNWRITTEN && xfs_ioend_is_append(ioend)) | |
1117 | err = xfs_setfilesize_trans_alloc(ioend); | |
1118 | ||
1119 | xfs_submit_ioend(wbc, iohead, err); | |
f6d6d4fc | 1120 | |
89f3b363 | 1121 | return 0; |
1da177e4 LT |
1122 | |
1123 | error: | |
f6d6d4fc CH |
1124 | if (iohead) |
1125 | xfs_cancel_ioend(iohead); | |
1da177e4 | 1126 | |
b5420f23 CH |
1127 | if (err == -EAGAIN) |
1128 | goto redirty; | |
1129 | ||
20cb52eb | 1130 | xfs_aops_discard_page(page); |
89f3b363 CH |
1131 | ClearPageUptodate(page); |
1132 | unlock_page(page); | |
1da177e4 | 1133 | return err; |
f51623b2 | 1134 | |
b5420f23 | 1135 | redirty: |
f51623b2 NS |
1136 | redirty_page_for_writepage(wbc, page); |
1137 | unlock_page(page); | |
1138 | return 0; | |
f51623b2 NS |
1139 | } |
1140 | ||
7d4fb40a NS |
1141 | STATIC int |
1142 | xfs_vm_writepages( | |
1143 | struct address_space *mapping, | |
1144 | struct writeback_control *wbc) | |
1145 | { | |
b3aea4ed | 1146 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
7d4fb40a NS |
1147 | return generic_writepages(mapping, wbc); |
1148 | } | |
1149 | ||
f51623b2 NS |
1150 | /* |
1151 | * Called to move a page into cleanable state - and from there | |
89f3b363 | 1152 | * to be released. The page should already be clean. We always |
f51623b2 NS |
1153 | * have buffer heads in this call. |
1154 | * | |
89f3b363 | 1155 | * Returns 1 if the page is ok to release, 0 otherwise. |
f51623b2 NS |
1156 | */ |
1157 | STATIC int | |
238f4c54 | 1158 | xfs_vm_releasepage( |
f51623b2 NS |
1159 | struct page *page, |
1160 | gfp_t gfp_mask) | |
1161 | { | |
20cb52eb | 1162 | int delalloc, unwritten; |
f51623b2 | 1163 | |
89f3b363 | 1164 | trace_xfs_releasepage(page->mapping->host, page, 0); |
238f4c54 | 1165 | |
20cb52eb | 1166 | xfs_count_page_state(page, &delalloc, &unwritten); |
f51623b2 | 1167 | |
89f3b363 | 1168 | if (WARN_ON(delalloc)) |
f51623b2 | 1169 | return 0; |
89f3b363 | 1170 | if (WARN_ON(unwritten)) |
f51623b2 NS |
1171 | return 0; |
1172 | ||
f51623b2 NS |
1173 | return try_to_free_buffers(page); |
1174 | } | |
1175 | ||
1da177e4 | 1176 | STATIC int |
c2536668 | 1177 | __xfs_get_blocks( |
1da177e4 LT |
1178 | struct inode *inode, |
1179 | sector_t iblock, | |
1da177e4 LT |
1180 | struct buffer_head *bh_result, |
1181 | int create, | |
f2bde9b8 | 1182 | int direct) |
1da177e4 | 1183 | { |
a206c817 CH |
1184 | struct xfs_inode *ip = XFS_I(inode); |
1185 | struct xfs_mount *mp = ip->i_mount; | |
1186 | xfs_fileoff_t offset_fsb, end_fsb; | |
1187 | int error = 0; | |
1188 | int lockmode = 0; | |
207d0416 | 1189 | struct xfs_bmbt_irec imap; |
a206c817 | 1190 | int nimaps = 1; |
fdc7ed75 NS |
1191 | xfs_off_t offset; |
1192 | ssize_t size; | |
207d0416 | 1193 | int new = 0; |
a206c817 CH |
1194 | |
1195 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1196 | return -XFS_ERROR(EIO); | |
1da177e4 | 1197 | |
fdc7ed75 | 1198 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
c2536668 NS |
1199 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
1200 | size = bh_result->b_size; | |
364f358a LM |
1201 | |
1202 | if (!create && direct && offset >= i_size_read(inode)) | |
1203 | return 0; | |
1204 | ||
507630b2 DC |
1205 | /* |
1206 | * Direct I/O is usually done on preallocated files, so try getting | |
1207 | * a block mapping without an exclusive lock first. For buffered | |
1208 | * writes we already have the exclusive iolock anyway, so avoiding | |
1209 | * a lock roundtrip here by taking the ilock exclusive from the | |
1210 | * beginning is a useful micro optimization. | |
1211 | */ | |
1212 | if (create && !direct) { | |
a206c817 CH |
1213 | lockmode = XFS_ILOCK_EXCL; |
1214 | xfs_ilock(ip, lockmode); | |
1215 | } else { | |
1216 | lockmode = xfs_ilock_map_shared(ip); | |
1217 | } | |
f2bde9b8 | 1218 | |
d2c28191 DC |
1219 | ASSERT(offset <= mp->m_super->s_maxbytes); |
1220 | if (offset + size > mp->m_super->s_maxbytes) | |
1221 | size = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
1222 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); |
1223 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1224 | ||
5c8ed202 DC |
1225 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
1226 | &imap, &nimaps, XFS_BMAPI_ENTIRE); | |
1da177e4 | 1227 | if (error) |
a206c817 CH |
1228 | goto out_unlock; |
1229 | ||
1230 | if (create && | |
1231 | (!nimaps || | |
1232 | (imap.br_startblock == HOLESTARTBLOCK || | |
1233 | imap.br_startblock == DELAYSTARTBLOCK))) { | |
aff3a9ed | 1234 | if (direct || xfs_get_extsz_hint(ip)) { |
507630b2 DC |
1235 | /* |
1236 | * Drop the ilock in preparation for starting the block | |
1237 | * allocation transaction. It will be retaken | |
1238 | * exclusively inside xfs_iomap_write_direct for the | |
1239 | * actual allocation. | |
1240 | */ | |
1241 | xfs_iunlock(ip, lockmode); | |
a206c817 CH |
1242 | error = xfs_iomap_write_direct(ip, offset, size, |
1243 | &imap, nimaps); | |
507630b2 DC |
1244 | if (error) |
1245 | return -error; | |
d3bc815a | 1246 | new = 1; |
a206c817 | 1247 | } else { |
507630b2 DC |
1248 | /* |
1249 | * Delalloc reservations do not require a transaction, | |
d3bc815a DC |
1250 | * we can go on without dropping the lock here. If we |
1251 | * are allocating a new delalloc block, make sure that | |
1252 | * we set the new flag so that we mark the buffer new so | |
1253 | * that we know that it is newly allocated if the write | |
1254 | * fails. | |
507630b2 | 1255 | */ |
d3bc815a DC |
1256 | if (nimaps && imap.br_startblock == HOLESTARTBLOCK) |
1257 | new = 1; | |
a206c817 | 1258 | error = xfs_iomap_write_delay(ip, offset, size, &imap); |
507630b2 DC |
1259 | if (error) |
1260 | goto out_unlock; | |
1261 | ||
1262 | xfs_iunlock(ip, lockmode); | |
a206c817 | 1263 | } |
a206c817 CH |
1264 | |
1265 | trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap); | |
1266 | } else if (nimaps) { | |
1267 | trace_xfs_get_blocks_found(ip, offset, size, 0, &imap); | |
507630b2 | 1268 | xfs_iunlock(ip, lockmode); |
a206c817 CH |
1269 | } else { |
1270 | trace_xfs_get_blocks_notfound(ip, offset, size); | |
1271 | goto out_unlock; | |
1272 | } | |
1da177e4 | 1273 | |
207d0416 CH |
1274 | if (imap.br_startblock != HOLESTARTBLOCK && |
1275 | imap.br_startblock != DELAYSTARTBLOCK) { | |
87cbc49c NS |
1276 | /* |
1277 | * For unwritten extents do not report a disk address on | |
1da177e4 LT |
1278 | * the read case (treat as if we're reading into a hole). |
1279 | */ | |
207d0416 CH |
1280 | if (create || !ISUNWRITTEN(&imap)) |
1281 | xfs_map_buffer(inode, bh_result, &imap, offset); | |
1282 | if (create && ISUNWRITTEN(&imap)) { | |
1da177e4 LT |
1283 | if (direct) |
1284 | bh_result->b_private = inode; | |
1285 | set_buffer_unwritten(bh_result); | |
1da177e4 LT |
1286 | } |
1287 | } | |
1288 | ||
c2536668 NS |
1289 | /* |
1290 | * If this is a realtime file, data may be on a different device. | |
1291 | * to that pointed to from the buffer_head b_bdev currently. | |
1292 | */ | |
046f1685 | 1293 | bh_result->b_bdev = xfs_find_bdev_for_inode(inode); |
1da177e4 | 1294 | |
c2536668 | 1295 | /* |
549054af DC |
1296 | * If we previously allocated a block out beyond eof and we are now |
1297 | * coming back to use it then we will need to flag it as new even if it | |
1298 | * has a disk address. | |
1299 | * | |
1300 | * With sub-block writes into unwritten extents we also need to mark | |
1301 | * the buffer as new so that the unwritten parts of the buffer gets | |
1302 | * correctly zeroed. | |
1da177e4 LT |
1303 | */ |
1304 | if (create && | |
1305 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || | |
549054af | 1306 | (offset >= i_size_read(inode)) || |
207d0416 | 1307 | (new || ISUNWRITTEN(&imap)))) |
1da177e4 | 1308 | set_buffer_new(bh_result); |
1da177e4 | 1309 | |
207d0416 | 1310 | if (imap.br_startblock == DELAYSTARTBLOCK) { |
1da177e4 LT |
1311 | BUG_ON(direct); |
1312 | if (create) { | |
1313 | set_buffer_uptodate(bh_result); | |
1314 | set_buffer_mapped(bh_result); | |
1315 | set_buffer_delay(bh_result); | |
1316 | } | |
1317 | } | |
1318 | ||
2b8f12b7 CH |
1319 | /* |
1320 | * If this is O_DIRECT or the mpage code calling tell them how large | |
1321 | * the mapping is, so that we can avoid repeated get_blocks calls. | |
1322 | */ | |
c2536668 | 1323 | if (direct || size > (1 << inode->i_blkbits)) { |
2b8f12b7 CH |
1324 | xfs_off_t mapping_size; |
1325 | ||
1326 | mapping_size = imap.br_startoff + imap.br_blockcount - iblock; | |
1327 | mapping_size <<= inode->i_blkbits; | |
1328 | ||
1329 | ASSERT(mapping_size > 0); | |
1330 | if (mapping_size > size) | |
1331 | mapping_size = size; | |
1332 | if (mapping_size > LONG_MAX) | |
1333 | mapping_size = LONG_MAX; | |
1334 | ||
1335 | bh_result->b_size = mapping_size; | |
1da177e4 LT |
1336 | } |
1337 | ||
1338 | return 0; | |
a206c817 CH |
1339 | |
1340 | out_unlock: | |
1341 | xfs_iunlock(ip, lockmode); | |
1342 | return -error; | |
1da177e4 LT |
1343 | } |
1344 | ||
1345 | int | |
c2536668 | 1346 | xfs_get_blocks( |
1da177e4 LT |
1347 | struct inode *inode, |
1348 | sector_t iblock, | |
1349 | struct buffer_head *bh_result, | |
1350 | int create) | |
1351 | { | |
f2bde9b8 | 1352 | return __xfs_get_blocks(inode, iblock, bh_result, create, 0); |
1da177e4 LT |
1353 | } |
1354 | ||
1355 | STATIC int | |
e4c573bb | 1356 | xfs_get_blocks_direct( |
1da177e4 LT |
1357 | struct inode *inode, |
1358 | sector_t iblock, | |
1da177e4 LT |
1359 | struct buffer_head *bh_result, |
1360 | int create) | |
1361 | { | |
f2bde9b8 | 1362 | return __xfs_get_blocks(inode, iblock, bh_result, create, 1); |
1da177e4 LT |
1363 | } |
1364 | ||
209fb87a CH |
1365 | /* |
1366 | * Complete a direct I/O write request. | |
1367 | * | |
1368 | * If the private argument is non-NULL __xfs_get_blocks signals us that we | |
1369 | * need to issue a transaction to convert the range from unwritten to written | |
1370 | * extents. In case this is regular synchronous I/O we just call xfs_end_io | |
25985edc | 1371 | * to do this and we are done. But in case this was a successful AIO |
209fb87a CH |
1372 | * request this handler is called from interrupt context, from which we |
1373 | * can't start transactions. In that case offload the I/O completion to | |
1374 | * the workqueues we also use for buffered I/O completion. | |
1375 | */ | |
f0973863 | 1376 | STATIC void |
209fb87a CH |
1377 | xfs_end_io_direct_write( |
1378 | struct kiocb *iocb, | |
1379 | loff_t offset, | |
1380 | ssize_t size, | |
1381 | void *private, | |
1382 | int ret, | |
1383 | bool is_async) | |
f0973863 | 1384 | { |
209fb87a | 1385 | struct xfs_ioend *ioend = iocb->private; |
f0973863 | 1386 | |
2813d682 CH |
1387 | /* |
1388 | * While the generic direct I/O code updates the inode size, it does | |
1389 | * so only after the end_io handler is called, which means our | |
1390 | * end_io handler thinks the on-disk size is outside the in-core | |
1391 | * size. To prevent this just update it a little bit earlier here. | |
1392 | */ | |
1393 | if (offset + size > i_size_read(ioend->io_inode)) | |
1394 | i_size_write(ioend->io_inode, offset + size); | |
1395 | ||
f0973863 | 1396 | /* |
209fb87a CH |
1397 | * blockdev_direct_IO can return an error even after the I/O |
1398 | * completion handler was called. Thus we need to protect | |
1399 | * against double-freeing. | |
f0973863 | 1400 | */ |
209fb87a CH |
1401 | iocb->private = NULL; |
1402 | ||
ba87ea69 LM |
1403 | ioend->io_offset = offset; |
1404 | ioend->io_size = size; | |
c859cdd1 CH |
1405 | ioend->io_iocb = iocb; |
1406 | ioend->io_result = ret; | |
209fb87a | 1407 | if (private && size > 0) |
0d882a36 | 1408 | ioend->io_type = XFS_IO_UNWRITTEN; |
209fb87a CH |
1409 | |
1410 | if (is_async) { | |
c859cdd1 | 1411 | ioend->io_isasync = 1; |
209fb87a | 1412 | xfs_finish_ioend(ioend); |
f0973863 | 1413 | } else { |
209fb87a | 1414 | xfs_finish_ioend_sync(ioend); |
f0973863 | 1415 | } |
f0973863 CH |
1416 | } |
1417 | ||
1da177e4 | 1418 | STATIC ssize_t |
e4c573bb | 1419 | xfs_vm_direct_IO( |
1da177e4 LT |
1420 | int rw, |
1421 | struct kiocb *iocb, | |
1422 | const struct iovec *iov, | |
1423 | loff_t offset, | |
1424 | unsigned long nr_segs) | |
1425 | { | |
209fb87a CH |
1426 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
1427 | struct block_device *bdev = xfs_find_bdev_for_inode(inode); | |
281627df | 1428 | struct xfs_ioend *ioend = NULL; |
209fb87a CH |
1429 | ssize_t ret; |
1430 | ||
1431 | if (rw & WRITE) { | |
281627df CH |
1432 | size_t size = iov_length(iov, nr_segs); |
1433 | ||
1434 | /* | |
1435 | * We need to preallocate a transaction for a size update | |
1436 | * here. In the case that this write both updates the size | |
1437 | * and converts at least on unwritten extent we will cancel | |
1438 | * the still clean transaction after the I/O has finished. | |
1439 | */ | |
0d882a36 | 1440 | iocb->private = ioend = xfs_alloc_ioend(inode, XFS_IO_DIRECT); |
281627df CH |
1441 | if (offset + size > XFS_I(inode)->i_d.di_size) { |
1442 | ret = xfs_setfilesize_trans_alloc(ioend); | |
1443 | if (ret) | |
1444 | goto out_destroy_ioend; | |
1445 | ioend->io_isdirect = 1; | |
1446 | } | |
209fb87a | 1447 | |
eafdc7d1 CH |
1448 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
1449 | offset, nr_segs, | |
1450 | xfs_get_blocks_direct, | |
1451 | xfs_end_io_direct_write, NULL, 0); | |
209fb87a | 1452 | if (ret != -EIOCBQUEUED && iocb->private) |
281627df | 1453 | goto out_trans_cancel; |
209fb87a | 1454 | } else { |
eafdc7d1 CH |
1455 | ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov, |
1456 | offset, nr_segs, | |
1457 | xfs_get_blocks_direct, | |
1458 | NULL, NULL, 0); | |
209fb87a | 1459 | } |
f0973863 | 1460 | |
f0973863 | 1461 | return ret; |
281627df CH |
1462 | |
1463 | out_trans_cancel: | |
1464 | if (ioend->io_append_trans) { | |
1465 | current_set_flags_nested(&ioend->io_append_trans->t_pflags, | |
1466 | PF_FSTRANS); | |
d9457dc0 JK |
1467 | rwsem_acquire_read( |
1468 | &inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], | |
1469 | 0, 1, _THIS_IP_); | |
281627df CH |
1470 | xfs_trans_cancel(ioend->io_append_trans, 0); |
1471 | } | |
1472 | out_destroy_ioend: | |
1473 | xfs_destroy_ioend(ioend); | |
1474 | return ret; | |
1da177e4 LT |
1475 | } |
1476 | ||
d3bc815a DC |
1477 | /* |
1478 | * Punch out the delalloc blocks we have already allocated. | |
1479 | * | |
1480 | * Don't bother with xfs_setattr given that nothing can have made it to disk yet | |
1481 | * as the page is still locked at this point. | |
1482 | */ | |
1483 | STATIC void | |
1484 | xfs_vm_kill_delalloc_range( | |
1485 | struct inode *inode, | |
1486 | loff_t start, | |
1487 | loff_t end) | |
1488 | { | |
1489 | struct xfs_inode *ip = XFS_I(inode); | |
1490 | xfs_fileoff_t start_fsb; | |
1491 | xfs_fileoff_t end_fsb; | |
1492 | int error; | |
1493 | ||
1494 | start_fsb = XFS_B_TO_FSB(ip->i_mount, start); | |
1495 | end_fsb = XFS_B_TO_FSB(ip->i_mount, end); | |
1496 | if (end_fsb <= start_fsb) | |
1497 | return; | |
1498 | ||
1499 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1500 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, | |
1501 | end_fsb - start_fsb); | |
1502 | if (error) { | |
1503 | /* something screwed, just bail */ | |
1504 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
1505 | xfs_alert(ip->i_mount, | |
1506 | "xfs_vm_write_failed: unable to clean up ino %lld", | |
1507 | ip->i_ino); | |
1508 | } | |
1509 | } | |
1510 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1511 | } | |
1512 | ||
fa9b227e CH |
1513 | STATIC void |
1514 | xfs_vm_write_failed( | |
d3bc815a DC |
1515 | struct inode *inode, |
1516 | struct page *page, | |
1517 | loff_t pos, | |
1518 | unsigned len) | |
fa9b227e | 1519 | { |
d3bc815a DC |
1520 | loff_t block_offset = pos & PAGE_MASK; |
1521 | loff_t block_start; | |
1522 | loff_t block_end; | |
1523 | loff_t from = pos & (PAGE_CACHE_SIZE - 1); | |
1524 | loff_t to = from + len; | |
1525 | struct buffer_head *bh, *head; | |
fa9b227e | 1526 | |
d3bc815a | 1527 | ASSERT(block_offset + from == pos); |
c726de44 | 1528 | |
d3bc815a DC |
1529 | head = page_buffers(page); |
1530 | block_start = 0; | |
1531 | for (bh = head; bh != head || !block_start; | |
1532 | bh = bh->b_this_page, block_start = block_end, | |
1533 | block_offset += bh->b_size) { | |
1534 | block_end = block_start + bh->b_size; | |
c726de44 | 1535 | |
d3bc815a DC |
1536 | /* skip buffers before the write */ |
1537 | if (block_end <= from) | |
1538 | continue; | |
1539 | ||
1540 | /* if the buffer is after the write, we're done */ | |
1541 | if (block_start >= to) | |
1542 | break; | |
1543 | ||
1544 | if (!buffer_delay(bh)) | |
1545 | continue; | |
1546 | ||
1547 | if (!buffer_new(bh) && block_offset < i_size_read(inode)) | |
1548 | continue; | |
1549 | ||
1550 | xfs_vm_kill_delalloc_range(inode, block_offset, | |
1551 | block_offset + bh->b_size); | |
fa9b227e | 1552 | } |
d3bc815a | 1553 | |
fa9b227e CH |
1554 | } |
1555 | ||
d3bc815a DC |
1556 | /* |
1557 | * This used to call block_write_begin(), but it unlocks and releases the page | |
1558 | * on error, and we need that page to be able to punch stale delalloc blocks out | |
1559 | * on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at | |
1560 | * the appropriate point. | |
1561 | */ | |
f51623b2 | 1562 | STATIC int |
d79689c7 | 1563 | xfs_vm_write_begin( |
f51623b2 | 1564 | struct file *file, |
d79689c7 NP |
1565 | struct address_space *mapping, |
1566 | loff_t pos, | |
1567 | unsigned len, | |
1568 | unsigned flags, | |
1569 | struct page **pagep, | |
1570 | void **fsdata) | |
f51623b2 | 1571 | { |
d3bc815a DC |
1572 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
1573 | struct page *page; | |
1574 | int status; | |
155130a4 | 1575 | |
d3bc815a DC |
1576 | ASSERT(len <= PAGE_CACHE_SIZE); |
1577 | ||
1578 | page = grab_cache_page_write_begin(mapping, index, | |
1579 | flags | AOP_FLAG_NOFS); | |
1580 | if (!page) | |
1581 | return -ENOMEM; | |
1582 | ||
1583 | status = __block_write_begin(page, pos, len, xfs_get_blocks); | |
1584 | if (unlikely(status)) { | |
1585 | struct inode *inode = mapping->host; | |
1586 | ||
1587 | xfs_vm_write_failed(inode, page, pos, len); | |
1588 | unlock_page(page); | |
1589 | ||
1590 | if (pos + len > i_size_read(inode)) | |
1591 | truncate_pagecache(inode, pos + len, i_size_read(inode)); | |
1592 | ||
1593 | page_cache_release(page); | |
1594 | page = NULL; | |
1595 | } | |
1596 | ||
1597 | *pagep = page; | |
1598 | return status; | |
fa9b227e CH |
1599 | } |
1600 | ||
d3bc815a DC |
1601 | /* |
1602 | * On failure, we only need to kill delalloc blocks beyond EOF because they | |
1603 | * will never be written. For blocks within EOF, generic_write_end() zeros them | |
1604 | * so they are safe to leave alone and be written with all the other valid data. | |
1605 | */ | |
fa9b227e CH |
1606 | STATIC int |
1607 | xfs_vm_write_end( | |
1608 | struct file *file, | |
1609 | struct address_space *mapping, | |
1610 | loff_t pos, | |
1611 | unsigned len, | |
1612 | unsigned copied, | |
1613 | struct page *page, | |
1614 | void *fsdata) | |
1615 | { | |
1616 | int ret; | |
155130a4 | 1617 | |
d3bc815a DC |
1618 | ASSERT(len <= PAGE_CACHE_SIZE); |
1619 | ||
fa9b227e | 1620 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
d3bc815a DC |
1621 | if (unlikely(ret < len)) { |
1622 | struct inode *inode = mapping->host; | |
1623 | size_t isize = i_size_read(inode); | |
1624 | loff_t to = pos + len; | |
1625 | ||
1626 | if (to > isize) { | |
1627 | truncate_pagecache(inode, to, isize); | |
1628 | xfs_vm_kill_delalloc_range(inode, isize, to); | |
1629 | } | |
1630 | } | |
155130a4 | 1631 | return ret; |
f51623b2 | 1632 | } |
1da177e4 LT |
1633 | |
1634 | STATIC sector_t | |
e4c573bb | 1635 | xfs_vm_bmap( |
1da177e4 LT |
1636 | struct address_space *mapping, |
1637 | sector_t block) | |
1638 | { | |
1639 | struct inode *inode = (struct inode *)mapping->host; | |
739bfb2a | 1640 | struct xfs_inode *ip = XFS_I(inode); |
1da177e4 | 1641 | |
cca28fb8 | 1642 | trace_xfs_vm_bmap(XFS_I(inode)); |
126468b1 | 1643 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
4bc1ea6b | 1644 | filemap_write_and_wait(mapping); |
126468b1 | 1645 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
c2536668 | 1646 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
1da177e4 LT |
1647 | } |
1648 | ||
1649 | STATIC int | |
e4c573bb | 1650 | xfs_vm_readpage( |
1da177e4 LT |
1651 | struct file *unused, |
1652 | struct page *page) | |
1653 | { | |
c2536668 | 1654 | return mpage_readpage(page, xfs_get_blocks); |
1da177e4 LT |
1655 | } |
1656 | ||
1657 | STATIC int | |
e4c573bb | 1658 | xfs_vm_readpages( |
1da177e4 LT |
1659 | struct file *unused, |
1660 | struct address_space *mapping, | |
1661 | struct list_head *pages, | |
1662 | unsigned nr_pages) | |
1663 | { | |
c2536668 | 1664 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
1da177e4 LT |
1665 | } |
1666 | ||
f5e54d6e | 1667 | const struct address_space_operations xfs_address_space_operations = { |
e4c573bb NS |
1668 | .readpage = xfs_vm_readpage, |
1669 | .readpages = xfs_vm_readpages, | |
1670 | .writepage = xfs_vm_writepage, | |
7d4fb40a | 1671 | .writepages = xfs_vm_writepages, |
238f4c54 NS |
1672 | .releasepage = xfs_vm_releasepage, |
1673 | .invalidatepage = xfs_vm_invalidatepage, | |
d79689c7 | 1674 | .write_begin = xfs_vm_write_begin, |
fa9b227e | 1675 | .write_end = xfs_vm_write_end, |
e4c573bb NS |
1676 | .bmap = xfs_vm_bmap, |
1677 | .direct_IO = xfs_vm_direct_IO, | |
e965f963 | 1678 | .migratepage = buffer_migrate_page, |
bddaafa1 | 1679 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1680 | .error_remove_page = generic_error_remove_page, |
1da177e4 | 1681 | }; |