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Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
70a9883c | 19 | #include "xfs_shared.h" |
239880ef DC |
20 | #include "xfs_format.h" |
21 | #include "xfs_log_format.h" | |
22 | #include "xfs_trans_resv.h" | |
1da177e4 | 23 | #include "xfs_mount.h" |
1da177e4 | 24 | #include "xfs_inode.h" |
239880ef | 25 | #include "xfs_trans.h" |
281627df | 26 | #include "xfs_inode_item.h" |
a844f451 | 27 | #include "xfs_alloc.h" |
1da177e4 | 28 | #include "xfs_error.h" |
1da177e4 | 29 | #include "xfs_iomap.h" |
0b1b213f | 30 | #include "xfs_trace.h" |
3ed3a434 | 31 | #include "xfs_bmap.h" |
68988114 | 32 | #include "xfs_bmap_util.h" |
a4fbe6ab | 33 | #include "xfs_bmap_btree.h" |
a27bb332 | 34 | #include <linux/aio.h> |
5a0e3ad6 | 35 | #include <linux/gfp.h> |
1da177e4 | 36 | #include <linux/mpage.h> |
10ce4444 | 37 | #include <linux/pagevec.h> |
1da177e4 LT |
38 | #include <linux/writeback.h> |
39 | ||
0b1b213f | 40 | void |
f51623b2 NS |
41 | xfs_count_page_state( |
42 | struct page *page, | |
43 | int *delalloc, | |
f51623b2 NS |
44 | int *unwritten) |
45 | { | |
46 | struct buffer_head *bh, *head; | |
47 | ||
20cb52eb | 48 | *delalloc = *unwritten = 0; |
f51623b2 NS |
49 | |
50 | bh = head = page_buffers(page); | |
51 | do { | |
20cb52eb | 52 | if (buffer_unwritten(bh)) |
f51623b2 NS |
53 | (*unwritten) = 1; |
54 | else if (buffer_delay(bh)) | |
55 | (*delalloc) = 1; | |
56 | } while ((bh = bh->b_this_page) != head); | |
57 | } | |
58 | ||
6214ed44 CH |
59 | STATIC struct block_device * |
60 | xfs_find_bdev_for_inode( | |
046f1685 | 61 | struct inode *inode) |
6214ed44 | 62 | { |
046f1685 | 63 | struct xfs_inode *ip = XFS_I(inode); |
6214ed44 CH |
64 | struct xfs_mount *mp = ip->i_mount; |
65 | ||
71ddabb9 | 66 | if (XFS_IS_REALTIME_INODE(ip)) |
6214ed44 CH |
67 | return mp->m_rtdev_targp->bt_bdev; |
68 | else | |
69 | return mp->m_ddev_targp->bt_bdev; | |
70 | } | |
71 | ||
f6d6d4fc CH |
72 | /* |
73 | * We're now finished for good with this ioend structure. | |
74 | * Update the page state via the associated buffer_heads, | |
75 | * release holds on the inode and bio, and finally free | |
76 | * up memory. Do not use the ioend after this. | |
77 | */ | |
0829c360 CH |
78 | STATIC void |
79 | xfs_destroy_ioend( | |
80 | xfs_ioend_t *ioend) | |
81 | { | |
f6d6d4fc CH |
82 | struct buffer_head *bh, *next; |
83 | ||
84 | for (bh = ioend->io_buffer_head; bh; bh = next) { | |
85 | next = bh->b_private; | |
7d04a335 | 86 | bh->b_end_io(bh, !ioend->io_error); |
f6d6d4fc | 87 | } |
583fa586 | 88 | |
0829c360 CH |
89 | mempool_free(ioend, xfs_ioend_pool); |
90 | } | |
91 | ||
fc0063c4 CH |
92 | /* |
93 | * Fast and loose check if this write could update the on-disk inode size. | |
94 | */ | |
95 | static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend) | |
96 | { | |
97 | return ioend->io_offset + ioend->io_size > | |
98 | XFS_I(ioend->io_inode)->i_d.di_size; | |
99 | } | |
100 | ||
281627df CH |
101 | STATIC int |
102 | xfs_setfilesize_trans_alloc( | |
103 | struct xfs_ioend *ioend) | |
104 | { | |
105 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; | |
106 | struct xfs_trans *tp; | |
107 | int error; | |
108 | ||
109 | tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); | |
110 | ||
3d3c8b52 | 111 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0); |
281627df CH |
112 | if (error) { |
113 | xfs_trans_cancel(tp, 0); | |
114 | return error; | |
115 | } | |
116 | ||
117 | ioend->io_append_trans = tp; | |
118 | ||
d9457dc0 | 119 | /* |
437a255a | 120 | * We may pass freeze protection with a transaction. So tell lockdep |
d9457dc0 JK |
121 | * we released it. |
122 | */ | |
123 | rwsem_release(&ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], | |
124 | 1, _THIS_IP_); | |
281627df CH |
125 | /* |
126 | * We hand off the transaction to the completion thread now, so | |
127 | * clear the flag here. | |
128 | */ | |
129 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
130 | return 0; | |
131 | } | |
132 | ||
ba87ea69 | 133 | /* |
2813d682 | 134 | * Update on-disk file size now that data has been written to disk. |
ba87ea69 | 135 | */ |
281627df | 136 | STATIC int |
ba87ea69 | 137 | xfs_setfilesize( |
2ba66237 CH |
138 | struct xfs_inode *ip, |
139 | struct xfs_trans *tp, | |
140 | xfs_off_t offset, | |
141 | size_t size) | |
ba87ea69 | 142 | { |
ba87ea69 | 143 | xfs_fsize_t isize; |
ba87ea69 | 144 | |
aa6bf01d | 145 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
2ba66237 | 146 | isize = xfs_new_eof(ip, offset + size); |
281627df CH |
147 | if (!isize) { |
148 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
149 | xfs_trans_cancel(tp, 0); | |
150 | return 0; | |
ba87ea69 LM |
151 | } |
152 | ||
2ba66237 | 153 | trace_xfs_setfilesize(ip, offset, size); |
281627df CH |
154 | |
155 | ip->i_d.di_size = isize; | |
156 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
157 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
158 | ||
159 | return xfs_trans_commit(tp, 0); | |
77d7a0c2 DC |
160 | } |
161 | ||
2ba66237 CH |
162 | STATIC int |
163 | xfs_setfilesize_ioend( | |
164 | struct xfs_ioend *ioend) | |
165 | { | |
166 | struct xfs_inode *ip = XFS_I(ioend->io_inode); | |
167 | struct xfs_trans *tp = ioend->io_append_trans; | |
168 | ||
169 | /* | |
170 | * The transaction may have been allocated in the I/O submission thread, | |
171 | * thus we need to mark ourselves as being in a transaction manually. | |
172 | * Similarly for freeze protection. | |
173 | */ | |
174 | current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); | |
175 | rwsem_acquire_read(&VFS_I(ip)->i_sb->s_writers.lock_map[SB_FREEZE_FS-1], | |
176 | 0, 1, _THIS_IP_); | |
177 | ||
178 | return xfs_setfilesize(ip, tp, ioend->io_offset, ioend->io_size); | |
179 | } | |
180 | ||
77d7a0c2 | 181 | /* |
209fb87a | 182 | * Schedule IO completion handling on the final put of an ioend. |
fc0063c4 CH |
183 | * |
184 | * If there is no work to do we might as well call it a day and free the | |
185 | * ioend right now. | |
77d7a0c2 DC |
186 | */ |
187 | STATIC void | |
188 | xfs_finish_ioend( | |
209fb87a | 189 | struct xfs_ioend *ioend) |
77d7a0c2 DC |
190 | { |
191 | if (atomic_dec_and_test(&ioend->io_remaining)) { | |
aa6bf01d CH |
192 | struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; |
193 | ||
0d882a36 | 194 | if (ioend->io_type == XFS_IO_UNWRITTEN) |
aa6bf01d | 195 | queue_work(mp->m_unwritten_workqueue, &ioend->io_work); |
2ba66237 | 196 | else if (ioend->io_append_trans) |
aa6bf01d | 197 | queue_work(mp->m_data_workqueue, &ioend->io_work); |
fc0063c4 CH |
198 | else |
199 | xfs_destroy_ioend(ioend); | |
77d7a0c2 | 200 | } |
ba87ea69 LM |
201 | } |
202 | ||
0829c360 | 203 | /* |
5ec4fabb | 204 | * IO write completion. |
f6d6d4fc CH |
205 | */ |
206 | STATIC void | |
5ec4fabb | 207 | xfs_end_io( |
77d7a0c2 | 208 | struct work_struct *work) |
0829c360 | 209 | { |
77d7a0c2 DC |
210 | xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work); |
211 | struct xfs_inode *ip = XFS_I(ioend->io_inode); | |
69418932 | 212 | int error = 0; |
ba87ea69 | 213 | |
04f658ee | 214 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
810627d9 | 215 | ioend->io_error = -EIO; |
04f658ee CH |
216 | goto done; |
217 | } | |
218 | if (ioend->io_error) | |
219 | goto done; | |
220 | ||
5ec4fabb CH |
221 | /* |
222 | * For unwritten extents we need to issue transactions to convert a | |
223 | * range to normal written extens after the data I/O has finished. | |
224 | */ | |
0d882a36 | 225 | if (ioend->io_type == XFS_IO_UNWRITTEN) { |
437a255a DC |
226 | error = xfs_iomap_write_unwritten(ip, ioend->io_offset, |
227 | ioend->io_size); | |
281627df | 228 | } else if (ioend->io_append_trans) { |
2ba66237 | 229 | error = xfs_setfilesize_ioend(ioend); |
84803fb7 | 230 | } else { |
281627df | 231 | ASSERT(!xfs_ioend_is_append(ioend)); |
5ec4fabb | 232 | } |
ba87ea69 | 233 | |
04f658ee | 234 | done: |
437a255a | 235 | if (error) |
2451337d | 236 | ioend->io_error = error; |
aa6bf01d | 237 | xfs_destroy_ioend(ioend); |
c626d174 DC |
238 | } |
239 | ||
0829c360 CH |
240 | /* |
241 | * Allocate and initialise an IO completion structure. | |
242 | * We need to track unwritten extent write completion here initially. | |
243 | * We'll need to extend this for updating the ondisk inode size later | |
244 | * (vs. incore size). | |
245 | */ | |
246 | STATIC xfs_ioend_t * | |
247 | xfs_alloc_ioend( | |
f6d6d4fc CH |
248 | struct inode *inode, |
249 | unsigned int type) | |
0829c360 CH |
250 | { |
251 | xfs_ioend_t *ioend; | |
252 | ||
253 | ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS); | |
254 | ||
255 | /* | |
256 | * Set the count to 1 initially, which will prevent an I/O | |
257 | * completion callback from happening before we have started | |
258 | * all the I/O from calling the completion routine too early. | |
259 | */ | |
260 | atomic_set(&ioend->io_remaining, 1); | |
7d04a335 | 261 | ioend->io_error = 0; |
f6d6d4fc CH |
262 | ioend->io_list = NULL; |
263 | ioend->io_type = type; | |
b677c210 | 264 | ioend->io_inode = inode; |
c1a073bd | 265 | ioend->io_buffer_head = NULL; |
f6d6d4fc | 266 | ioend->io_buffer_tail = NULL; |
0829c360 CH |
267 | ioend->io_offset = 0; |
268 | ioend->io_size = 0; | |
281627df | 269 | ioend->io_append_trans = NULL; |
0829c360 | 270 | |
5ec4fabb | 271 | INIT_WORK(&ioend->io_work, xfs_end_io); |
0829c360 CH |
272 | return ioend; |
273 | } | |
274 | ||
1da177e4 LT |
275 | STATIC int |
276 | xfs_map_blocks( | |
277 | struct inode *inode, | |
278 | loff_t offset, | |
207d0416 | 279 | struct xfs_bmbt_irec *imap, |
a206c817 CH |
280 | int type, |
281 | int nonblocking) | |
1da177e4 | 282 | { |
a206c817 CH |
283 | struct xfs_inode *ip = XFS_I(inode); |
284 | struct xfs_mount *mp = ip->i_mount; | |
ed1e7b7e | 285 | ssize_t count = 1 << inode->i_blkbits; |
a206c817 CH |
286 | xfs_fileoff_t offset_fsb, end_fsb; |
287 | int error = 0; | |
a206c817 CH |
288 | int bmapi_flags = XFS_BMAPI_ENTIRE; |
289 | int nimaps = 1; | |
290 | ||
291 | if (XFS_FORCED_SHUTDOWN(mp)) | |
b474c7ae | 292 | return -EIO; |
a206c817 | 293 | |
0d882a36 | 294 | if (type == XFS_IO_UNWRITTEN) |
a206c817 | 295 | bmapi_flags |= XFS_BMAPI_IGSTATE; |
8ff2957d CH |
296 | |
297 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { | |
298 | if (nonblocking) | |
b474c7ae | 299 | return -EAGAIN; |
8ff2957d | 300 | xfs_ilock(ip, XFS_ILOCK_SHARED); |
a206c817 CH |
301 | } |
302 | ||
8ff2957d CH |
303 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
304 | (ip->i_df.if_flags & XFS_IFEXTENTS)); | |
d2c28191 | 305 | ASSERT(offset <= mp->m_super->s_maxbytes); |
8ff2957d | 306 | |
d2c28191 DC |
307 | if (offset + count > mp->m_super->s_maxbytes) |
308 | count = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
309 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
310 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
5c8ed202 DC |
311 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
312 | imap, &nimaps, bmapi_flags); | |
8ff2957d | 313 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
a206c817 | 314 | |
8ff2957d | 315 | if (error) |
2451337d | 316 | return error; |
a206c817 | 317 | |
0d882a36 | 318 | if (type == XFS_IO_DELALLOC && |
8ff2957d | 319 | (!nimaps || isnullstartblock(imap->br_startblock))) { |
0799a3e8 | 320 | error = xfs_iomap_write_allocate(ip, offset, imap); |
a206c817 CH |
321 | if (!error) |
322 | trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); | |
2451337d | 323 | return error; |
a206c817 CH |
324 | } |
325 | ||
8ff2957d | 326 | #ifdef DEBUG |
0d882a36 | 327 | if (type == XFS_IO_UNWRITTEN) { |
8ff2957d CH |
328 | ASSERT(nimaps); |
329 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); | |
330 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
331 | } | |
332 | #endif | |
333 | if (nimaps) | |
334 | trace_xfs_map_blocks_found(ip, offset, count, type, imap); | |
335 | return 0; | |
1da177e4 LT |
336 | } |
337 | ||
b8f82a4a | 338 | STATIC int |
558e6891 | 339 | xfs_imap_valid( |
8699bb0a | 340 | struct inode *inode, |
207d0416 | 341 | struct xfs_bmbt_irec *imap, |
558e6891 | 342 | xfs_off_t offset) |
1da177e4 | 343 | { |
558e6891 | 344 | offset >>= inode->i_blkbits; |
8699bb0a | 345 | |
558e6891 CH |
346 | return offset >= imap->br_startoff && |
347 | offset < imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
348 | } |
349 | ||
f6d6d4fc CH |
350 | /* |
351 | * BIO completion handler for buffered IO. | |
352 | */ | |
782e3b3b | 353 | STATIC void |
f6d6d4fc CH |
354 | xfs_end_bio( |
355 | struct bio *bio, | |
f6d6d4fc CH |
356 | int error) |
357 | { | |
358 | xfs_ioend_t *ioend = bio->bi_private; | |
359 | ||
f6d6d4fc | 360 | ASSERT(atomic_read(&bio->bi_cnt) >= 1); |
7d04a335 | 361 | ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; |
f6d6d4fc CH |
362 | |
363 | /* Toss bio and pass work off to an xfsdatad thread */ | |
f6d6d4fc CH |
364 | bio->bi_private = NULL; |
365 | bio->bi_end_io = NULL; | |
f6d6d4fc | 366 | bio_put(bio); |
7d04a335 | 367 | |
209fb87a | 368 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
369 | } |
370 | ||
371 | STATIC void | |
372 | xfs_submit_ioend_bio( | |
06342cf8 CH |
373 | struct writeback_control *wbc, |
374 | xfs_ioend_t *ioend, | |
375 | struct bio *bio) | |
f6d6d4fc CH |
376 | { |
377 | atomic_inc(&ioend->io_remaining); | |
f6d6d4fc CH |
378 | bio->bi_private = ioend; |
379 | bio->bi_end_io = xfs_end_bio; | |
721a9602 | 380 | submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio); |
f6d6d4fc CH |
381 | } |
382 | ||
383 | STATIC struct bio * | |
384 | xfs_alloc_ioend_bio( | |
385 | struct buffer_head *bh) | |
386 | { | |
f6d6d4fc | 387 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
221cb251 | 388 | struct bio *bio = bio_alloc(GFP_NOIO, nvecs); |
f6d6d4fc CH |
389 | |
390 | ASSERT(bio->bi_private == NULL); | |
4f024f37 | 391 | bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
f6d6d4fc | 392 | bio->bi_bdev = bh->b_bdev; |
f6d6d4fc CH |
393 | return bio; |
394 | } | |
395 | ||
396 | STATIC void | |
397 | xfs_start_buffer_writeback( | |
398 | struct buffer_head *bh) | |
399 | { | |
400 | ASSERT(buffer_mapped(bh)); | |
401 | ASSERT(buffer_locked(bh)); | |
402 | ASSERT(!buffer_delay(bh)); | |
403 | ASSERT(!buffer_unwritten(bh)); | |
404 | ||
405 | mark_buffer_async_write(bh); | |
406 | set_buffer_uptodate(bh); | |
407 | clear_buffer_dirty(bh); | |
408 | } | |
409 | ||
410 | STATIC void | |
411 | xfs_start_page_writeback( | |
412 | struct page *page, | |
f6d6d4fc CH |
413 | int clear_dirty, |
414 | int buffers) | |
415 | { | |
416 | ASSERT(PageLocked(page)); | |
417 | ASSERT(!PageWriteback(page)); | |
0d085a52 DC |
418 | |
419 | /* | |
420 | * if the page was not fully cleaned, we need to ensure that the higher | |
421 | * layers come back to it correctly. That means we need to keep the page | |
422 | * dirty, and for WB_SYNC_ALL writeback we need to ensure the | |
423 | * PAGECACHE_TAG_TOWRITE index mark is not removed so another attempt to | |
424 | * write this page in this writeback sweep will be made. | |
425 | */ | |
426 | if (clear_dirty) { | |
92132021 | 427 | clear_page_dirty_for_io(page); |
0d085a52 DC |
428 | set_page_writeback(page); |
429 | } else | |
430 | set_page_writeback_keepwrite(page); | |
431 | ||
f6d6d4fc | 432 | unlock_page(page); |
0d085a52 | 433 | |
1f7decf6 FW |
434 | /* If no buffers on the page are to be written, finish it here */ |
435 | if (!buffers) | |
f6d6d4fc | 436 | end_page_writeback(page); |
f6d6d4fc CH |
437 | } |
438 | ||
c7c1a7d8 | 439 | static inline int xfs_bio_add_buffer(struct bio *bio, struct buffer_head *bh) |
f6d6d4fc CH |
440 | { |
441 | return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
442 | } | |
443 | ||
444 | /* | |
d88992f6 DC |
445 | * Submit all of the bios for all of the ioends we have saved up, covering the |
446 | * initial writepage page and also any probed pages. | |
447 | * | |
448 | * Because we may have multiple ioends spanning a page, we need to start | |
449 | * writeback on all the buffers before we submit them for I/O. If we mark the | |
450 | * buffers as we got, then we can end up with a page that only has buffers | |
451 | * marked async write and I/O complete on can occur before we mark the other | |
452 | * buffers async write. | |
453 | * | |
454 | * The end result of this is that we trip a bug in end_page_writeback() because | |
455 | * we call it twice for the one page as the code in end_buffer_async_write() | |
456 | * assumes that all buffers on the page are started at the same time. | |
457 | * | |
458 | * The fix is two passes across the ioend list - one to start writeback on the | |
c41564b5 | 459 | * buffer_heads, and then submit them for I/O on the second pass. |
7bf7f352 DC |
460 | * |
461 | * If @fail is non-zero, it means that we have a situation where some part of | |
462 | * the submission process has failed after we have marked paged for writeback | |
463 | * and unlocked them. In this situation, we need to fail the ioend chain rather | |
464 | * than submit it to IO. This typically only happens on a filesystem shutdown. | |
f6d6d4fc CH |
465 | */ |
466 | STATIC void | |
467 | xfs_submit_ioend( | |
06342cf8 | 468 | struct writeback_control *wbc, |
7bf7f352 DC |
469 | xfs_ioend_t *ioend, |
470 | int fail) | |
f6d6d4fc | 471 | { |
d88992f6 | 472 | xfs_ioend_t *head = ioend; |
f6d6d4fc CH |
473 | xfs_ioend_t *next; |
474 | struct buffer_head *bh; | |
475 | struct bio *bio; | |
476 | sector_t lastblock = 0; | |
477 | ||
d88992f6 DC |
478 | /* Pass 1 - start writeback */ |
479 | do { | |
480 | next = ioend->io_list; | |
221cb251 | 481 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) |
d88992f6 | 482 | xfs_start_buffer_writeback(bh); |
d88992f6 DC |
483 | } while ((ioend = next) != NULL); |
484 | ||
485 | /* Pass 2 - submit I/O */ | |
486 | ioend = head; | |
f6d6d4fc CH |
487 | do { |
488 | next = ioend->io_list; | |
489 | bio = NULL; | |
490 | ||
7bf7f352 DC |
491 | /* |
492 | * If we are failing the IO now, just mark the ioend with an | |
493 | * error and finish it. This will run IO completion immediately | |
494 | * as there is only one reference to the ioend at this point in | |
495 | * time. | |
496 | */ | |
497 | if (fail) { | |
2451337d | 498 | ioend->io_error = fail; |
7bf7f352 DC |
499 | xfs_finish_ioend(ioend); |
500 | continue; | |
501 | } | |
502 | ||
f6d6d4fc | 503 | for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) { |
f6d6d4fc CH |
504 | |
505 | if (!bio) { | |
506 | retry: | |
507 | bio = xfs_alloc_ioend_bio(bh); | |
508 | } else if (bh->b_blocknr != lastblock + 1) { | |
06342cf8 | 509 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
510 | goto retry; |
511 | } | |
512 | ||
c7c1a7d8 | 513 | if (xfs_bio_add_buffer(bio, bh) != bh->b_size) { |
06342cf8 | 514 | xfs_submit_ioend_bio(wbc, ioend, bio); |
f6d6d4fc CH |
515 | goto retry; |
516 | } | |
517 | ||
518 | lastblock = bh->b_blocknr; | |
519 | } | |
520 | if (bio) | |
06342cf8 | 521 | xfs_submit_ioend_bio(wbc, ioend, bio); |
209fb87a | 522 | xfs_finish_ioend(ioend); |
f6d6d4fc CH |
523 | } while ((ioend = next) != NULL); |
524 | } | |
525 | ||
526 | /* | |
527 | * Cancel submission of all buffer_heads so far in this endio. | |
528 | * Toss the endio too. Only ever called for the initial page | |
529 | * in a writepage request, so only ever one page. | |
530 | */ | |
531 | STATIC void | |
532 | xfs_cancel_ioend( | |
533 | xfs_ioend_t *ioend) | |
534 | { | |
535 | xfs_ioend_t *next; | |
536 | struct buffer_head *bh, *next_bh; | |
537 | ||
538 | do { | |
539 | next = ioend->io_list; | |
540 | bh = ioend->io_buffer_head; | |
541 | do { | |
542 | next_bh = bh->b_private; | |
543 | clear_buffer_async_write(bh); | |
07d08681 BF |
544 | /* |
545 | * The unwritten flag is cleared when added to the | |
546 | * ioend. We're not submitting for I/O so mark the | |
547 | * buffer unwritten again for next time around. | |
548 | */ | |
549 | if (ioend->io_type == XFS_IO_UNWRITTEN) | |
550 | set_buffer_unwritten(bh); | |
f6d6d4fc CH |
551 | unlock_buffer(bh); |
552 | } while ((bh = next_bh) != NULL); | |
553 | ||
f6d6d4fc CH |
554 | mempool_free(ioend, xfs_ioend_pool); |
555 | } while ((ioend = next) != NULL); | |
556 | } | |
557 | ||
558 | /* | |
559 | * Test to see if we've been building up a completion structure for | |
560 | * earlier buffers -- if so, we try to append to this ioend if we | |
561 | * can, otherwise we finish off any current ioend and start another. | |
562 | * Return true if we've finished the given ioend. | |
563 | */ | |
564 | STATIC void | |
565 | xfs_add_to_ioend( | |
566 | struct inode *inode, | |
567 | struct buffer_head *bh, | |
7336cea8 | 568 | xfs_off_t offset, |
f6d6d4fc CH |
569 | unsigned int type, |
570 | xfs_ioend_t **result, | |
571 | int need_ioend) | |
572 | { | |
573 | xfs_ioend_t *ioend = *result; | |
574 | ||
575 | if (!ioend || need_ioend || type != ioend->io_type) { | |
576 | xfs_ioend_t *previous = *result; | |
f6d6d4fc | 577 | |
f6d6d4fc CH |
578 | ioend = xfs_alloc_ioend(inode, type); |
579 | ioend->io_offset = offset; | |
580 | ioend->io_buffer_head = bh; | |
581 | ioend->io_buffer_tail = bh; | |
582 | if (previous) | |
583 | previous->io_list = ioend; | |
584 | *result = ioend; | |
585 | } else { | |
586 | ioend->io_buffer_tail->b_private = bh; | |
587 | ioend->io_buffer_tail = bh; | |
588 | } | |
589 | ||
590 | bh->b_private = NULL; | |
591 | ioend->io_size += bh->b_size; | |
592 | } | |
593 | ||
87cbc49c NS |
594 | STATIC void |
595 | xfs_map_buffer( | |
046f1685 | 596 | struct inode *inode, |
87cbc49c | 597 | struct buffer_head *bh, |
207d0416 | 598 | struct xfs_bmbt_irec *imap, |
046f1685 | 599 | xfs_off_t offset) |
87cbc49c NS |
600 | { |
601 | sector_t bn; | |
8699bb0a | 602 | struct xfs_mount *m = XFS_I(inode)->i_mount; |
207d0416 CH |
603 | xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff); |
604 | xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), imap->br_startblock); | |
87cbc49c | 605 | |
207d0416 CH |
606 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
607 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
87cbc49c | 608 | |
e513182d | 609 | bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) + |
8699bb0a | 610 | ((offset - iomap_offset) >> inode->i_blkbits); |
87cbc49c | 611 | |
046f1685 | 612 | ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode))); |
87cbc49c NS |
613 | |
614 | bh->b_blocknr = bn; | |
615 | set_buffer_mapped(bh); | |
616 | } | |
617 | ||
1da177e4 LT |
618 | STATIC void |
619 | xfs_map_at_offset( | |
046f1685 | 620 | struct inode *inode, |
1da177e4 | 621 | struct buffer_head *bh, |
207d0416 | 622 | struct xfs_bmbt_irec *imap, |
046f1685 | 623 | xfs_off_t offset) |
1da177e4 | 624 | { |
207d0416 CH |
625 | ASSERT(imap->br_startblock != HOLESTARTBLOCK); |
626 | ASSERT(imap->br_startblock != DELAYSTARTBLOCK); | |
1da177e4 | 627 | |
207d0416 | 628 | xfs_map_buffer(inode, bh, imap, offset); |
1da177e4 LT |
629 | set_buffer_mapped(bh); |
630 | clear_buffer_delay(bh); | |
f6d6d4fc | 631 | clear_buffer_unwritten(bh); |
1da177e4 LT |
632 | } |
633 | ||
1da177e4 | 634 | /* |
a49935f2 DC |
635 | * Test if a given page contains at least one buffer of a given @type. |
636 | * If @check_all_buffers is true, then we walk all the buffers in the page to | |
637 | * try to find one of the type passed in. If it is not set, then the caller only | |
638 | * needs to check the first buffer on the page for a match. | |
1da177e4 | 639 | */ |
a49935f2 | 640 | STATIC bool |
6ffc4db5 | 641 | xfs_check_page_type( |
10ce4444 | 642 | struct page *page, |
a49935f2 DC |
643 | unsigned int type, |
644 | bool check_all_buffers) | |
1da177e4 | 645 | { |
a49935f2 DC |
646 | struct buffer_head *bh; |
647 | struct buffer_head *head; | |
1da177e4 | 648 | |
a49935f2 DC |
649 | if (PageWriteback(page)) |
650 | return false; | |
651 | if (!page->mapping) | |
652 | return false; | |
653 | if (!page_has_buffers(page)) | |
654 | return false; | |
1da177e4 | 655 | |
a49935f2 DC |
656 | bh = head = page_buffers(page); |
657 | do { | |
658 | if (buffer_unwritten(bh)) { | |
659 | if (type == XFS_IO_UNWRITTEN) | |
660 | return true; | |
661 | } else if (buffer_delay(bh)) { | |
805eeb8e | 662 | if (type == XFS_IO_DELALLOC) |
a49935f2 DC |
663 | return true; |
664 | } else if (buffer_dirty(bh) && buffer_mapped(bh)) { | |
805eeb8e | 665 | if (type == XFS_IO_OVERWRITE) |
a49935f2 DC |
666 | return true; |
667 | } | |
1da177e4 | 668 | |
a49935f2 DC |
669 | /* If we are only checking the first buffer, we are done now. */ |
670 | if (!check_all_buffers) | |
671 | break; | |
672 | } while ((bh = bh->b_this_page) != head); | |
1da177e4 | 673 | |
a49935f2 | 674 | return false; |
1da177e4 LT |
675 | } |
676 | ||
1da177e4 LT |
677 | /* |
678 | * Allocate & map buffers for page given the extent map. Write it out. | |
679 | * except for the original page of a writepage, this is called on | |
680 | * delalloc/unwritten pages only, for the original page it is possible | |
681 | * that the page has no mapping at all. | |
682 | */ | |
f6d6d4fc | 683 | STATIC int |
1da177e4 LT |
684 | xfs_convert_page( |
685 | struct inode *inode, | |
686 | struct page *page, | |
10ce4444 | 687 | loff_t tindex, |
207d0416 | 688 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 689 | xfs_ioend_t **ioendp, |
2fa24f92 | 690 | struct writeback_control *wbc) |
1da177e4 | 691 | { |
f6d6d4fc | 692 | struct buffer_head *bh, *head; |
9260dc6b CH |
693 | xfs_off_t end_offset; |
694 | unsigned long p_offset; | |
f6d6d4fc | 695 | unsigned int type; |
24e17b5f | 696 | int len, page_dirty; |
f6d6d4fc | 697 | int count = 0, done = 0, uptodate = 1; |
9260dc6b | 698 | xfs_off_t offset = page_offset(page); |
1da177e4 | 699 | |
10ce4444 CH |
700 | if (page->index != tindex) |
701 | goto fail; | |
529ae9aa | 702 | if (!trylock_page(page)) |
10ce4444 CH |
703 | goto fail; |
704 | if (PageWriteback(page)) | |
705 | goto fail_unlock_page; | |
706 | if (page->mapping != inode->i_mapping) | |
707 | goto fail_unlock_page; | |
a49935f2 | 708 | if (!xfs_check_page_type(page, (*ioendp)->io_type, false)) |
10ce4444 CH |
709 | goto fail_unlock_page; |
710 | ||
24e17b5f NS |
711 | /* |
712 | * page_dirty is initially a count of buffers on the page before | |
c41564b5 | 713 | * EOF and is decremented as we move each into a cleanable state. |
9260dc6b CH |
714 | * |
715 | * Derivation: | |
716 | * | |
717 | * End offset is the highest offset that this page should represent. | |
718 | * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1)) | |
719 | * will evaluate non-zero and be less than PAGE_CACHE_SIZE and | |
720 | * hence give us the correct page_dirty count. On any other page, | |
721 | * it will be zero and in that case we need page_dirty to be the | |
722 | * count of buffers on the page. | |
24e17b5f | 723 | */ |
9260dc6b CH |
724 | end_offset = min_t(unsigned long long, |
725 | (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, | |
726 | i_size_read(inode)); | |
727 | ||
480d7467 DC |
728 | /* |
729 | * If the current map does not span the entire page we are about to try | |
730 | * to write, then give up. The only way we can write a page that spans | |
731 | * multiple mappings in a single writeback iteration is via the | |
732 | * xfs_vm_writepage() function. Data integrity writeback requires the | |
733 | * entire page to be written in a single attempt, otherwise the part of | |
734 | * the page we don't write here doesn't get written as part of the data | |
735 | * integrity sync. | |
736 | * | |
737 | * For normal writeback, we also don't attempt to write partial pages | |
738 | * here as it simply means that write_cache_pages() will see it under | |
739 | * writeback and ignore the page until some point in the future, at | |
740 | * which time this will be the only page in the file that needs | |
741 | * writeback. Hence for more optimal IO patterns, we should always | |
742 | * avoid partial page writeback due to multiple mappings on a page here. | |
743 | */ | |
744 | if (!xfs_imap_valid(inode, imap, end_offset)) | |
745 | goto fail_unlock_page; | |
746 | ||
24e17b5f | 747 | len = 1 << inode->i_blkbits; |
9260dc6b CH |
748 | p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1), |
749 | PAGE_CACHE_SIZE); | |
750 | p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE; | |
751 | page_dirty = p_offset / len; | |
24e17b5f | 752 | |
a49935f2 DC |
753 | /* |
754 | * The moment we find a buffer that doesn't match our current type | |
755 | * specification or can't be written, abort the loop and start | |
756 | * writeback. As per the above xfs_imap_valid() check, only | |
757 | * xfs_vm_writepage() can handle partial page writeback fully - we are | |
758 | * limited here to the buffers that are contiguous with the current | |
759 | * ioend, and hence a buffer we can't write breaks that contiguity and | |
760 | * we have to defer the rest of the IO to xfs_vm_writepage(). | |
761 | */ | |
1da177e4 LT |
762 | bh = head = page_buffers(page); |
763 | do { | |
9260dc6b | 764 | if (offset >= end_offset) |
1da177e4 | 765 | break; |
f6d6d4fc CH |
766 | if (!buffer_uptodate(bh)) |
767 | uptodate = 0; | |
768 | if (!(PageUptodate(page) || buffer_uptodate(bh))) { | |
769 | done = 1; | |
a49935f2 | 770 | break; |
f6d6d4fc CH |
771 | } |
772 | ||
2fa24f92 CH |
773 | if (buffer_unwritten(bh) || buffer_delay(bh) || |
774 | buffer_mapped(bh)) { | |
9260dc6b | 775 | if (buffer_unwritten(bh)) |
0d882a36 | 776 | type = XFS_IO_UNWRITTEN; |
2fa24f92 | 777 | else if (buffer_delay(bh)) |
0d882a36 | 778 | type = XFS_IO_DELALLOC; |
2fa24f92 | 779 | else |
0d882a36 | 780 | type = XFS_IO_OVERWRITE; |
9260dc6b | 781 | |
a49935f2 DC |
782 | /* |
783 | * imap should always be valid because of the above | |
784 | * partial page end_offset check on the imap. | |
785 | */ | |
786 | ASSERT(xfs_imap_valid(inode, imap, offset)); | |
9260dc6b | 787 | |
ecff71e6 | 788 | lock_buffer(bh); |
0d882a36 | 789 | if (type != XFS_IO_OVERWRITE) |
2fa24f92 | 790 | xfs_map_at_offset(inode, bh, imap, offset); |
89f3b363 CH |
791 | xfs_add_to_ioend(inode, bh, offset, type, |
792 | ioendp, done); | |
793 | ||
9260dc6b CH |
794 | page_dirty--; |
795 | count++; | |
796 | } else { | |
2fa24f92 | 797 | done = 1; |
a49935f2 | 798 | break; |
1da177e4 | 799 | } |
7336cea8 | 800 | } while (offset += len, (bh = bh->b_this_page) != head); |
1da177e4 | 801 | |
f6d6d4fc CH |
802 | if (uptodate && bh == head) |
803 | SetPageUptodate(page); | |
804 | ||
89f3b363 | 805 | if (count) { |
efceab1d DC |
806 | if (--wbc->nr_to_write <= 0 && |
807 | wbc->sync_mode == WB_SYNC_NONE) | |
89f3b363 | 808 | done = 1; |
1da177e4 | 809 | } |
89f3b363 | 810 | xfs_start_page_writeback(page, !page_dirty, count); |
f6d6d4fc CH |
811 | |
812 | return done; | |
10ce4444 CH |
813 | fail_unlock_page: |
814 | unlock_page(page); | |
815 | fail: | |
816 | return 1; | |
1da177e4 LT |
817 | } |
818 | ||
819 | /* | |
820 | * Convert & write out a cluster of pages in the same extent as defined | |
821 | * by mp and following the start page. | |
822 | */ | |
823 | STATIC void | |
824 | xfs_cluster_write( | |
825 | struct inode *inode, | |
826 | pgoff_t tindex, | |
207d0416 | 827 | struct xfs_bmbt_irec *imap, |
f6d6d4fc | 828 | xfs_ioend_t **ioendp, |
1da177e4 | 829 | struct writeback_control *wbc, |
1da177e4 LT |
830 | pgoff_t tlast) |
831 | { | |
10ce4444 CH |
832 | struct pagevec pvec; |
833 | int done = 0, i; | |
1da177e4 | 834 | |
10ce4444 CH |
835 | pagevec_init(&pvec, 0); |
836 | while (!done && tindex <= tlast) { | |
837 | unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1); | |
838 | ||
839 | if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len)) | |
1da177e4 | 840 | break; |
10ce4444 CH |
841 | |
842 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
843 | done = xfs_convert_page(inode, pvec.pages[i], tindex++, | |
2fa24f92 | 844 | imap, ioendp, wbc); |
10ce4444 CH |
845 | if (done) |
846 | break; | |
847 | } | |
848 | ||
849 | pagevec_release(&pvec); | |
850 | cond_resched(); | |
1da177e4 LT |
851 | } |
852 | } | |
853 | ||
3ed3a434 DC |
854 | STATIC void |
855 | xfs_vm_invalidatepage( | |
856 | struct page *page, | |
d47992f8 LC |
857 | unsigned int offset, |
858 | unsigned int length) | |
3ed3a434 | 859 | { |
34097dfe LC |
860 | trace_xfs_invalidatepage(page->mapping->host, page, offset, |
861 | length); | |
862 | block_invalidatepage(page, offset, length); | |
3ed3a434 DC |
863 | } |
864 | ||
865 | /* | |
866 | * If the page has delalloc buffers on it, we need to punch them out before we | |
867 | * invalidate the page. If we don't, we leave a stale delalloc mapping on the | |
868 | * inode that can trip a BUG() in xfs_get_blocks() later on if a direct IO read | |
869 | * is done on that same region - the delalloc extent is returned when none is | |
870 | * supposed to be there. | |
871 | * | |
872 | * We prevent this by truncating away the delalloc regions on the page before | |
873 | * invalidating it. Because they are delalloc, we can do this without needing a | |
874 | * transaction. Indeed - if we get ENOSPC errors, we have to be able to do this | |
875 | * truncation without a transaction as there is no space left for block | |
876 | * reservation (typically why we see a ENOSPC in writeback). | |
877 | * | |
878 | * This is not a performance critical path, so for now just do the punching a | |
879 | * buffer head at a time. | |
880 | */ | |
881 | STATIC void | |
882 | xfs_aops_discard_page( | |
883 | struct page *page) | |
884 | { | |
885 | struct inode *inode = page->mapping->host; | |
886 | struct xfs_inode *ip = XFS_I(inode); | |
887 | struct buffer_head *bh, *head; | |
888 | loff_t offset = page_offset(page); | |
3ed3a434 | 889 | |
a49935f2 | 890 | if (!xfs_check_page_type(page, XFS_IO_DELALLOC, true)) |
3ed3a434 DC |
891 | goto out_invalidate; |
892 | ||
e8c3753c DC |
893 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
894 | goto out_invalidate; | |
895 | ||
4f10700a | 896 | xfs_alert(ip->i_mount, |
3ed3a434 DC |
897 | "page discard on page %p, inode 0x%llx, offset %llu.", |
898 | page, ip->i_ino, offset); | |
899 | ||
900 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
901 | bh = head = page_buffers(page); | |
902 | do { | |
3ed3a434 | 903 | int error; |
c726de44 | 904 | xfs_fileoff_t start_fsb; |
3ed3a434 DC |
905 | |
906 | if (!buffer_delay(bh)) | |
907 | goto next_buffer; | |
908 | ||
c726de44 DC |
909 | start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); |
910 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1); | |
3ed3a434 DC |
911 | if (error) { |
912 | /* something screwed, just bail */ | |
e8c3753c | 913 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
4f10700a | 914 | xfs_alert(ip->i_mount, |
3ed3a434 | 915 | "page discard unable to remove delalloc mapping."); |
e8c3753c | 916 | } |
3ed3a434 DC |
917 | break; |
918 | } | |
919 | next_buffer: | |
c726de44 | 920 | offset += 1 << inode->i_blkbits; |
3ed3a434 DC |
921 | |
922 | } while ((bh = bh->b_this_page) != head); | |
923 | ||
924 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
925 | out_invalidate: | |
d47992f8 | 926 | xfs_vm_invalidatepage(page, 0, PAGE_CACHE_SIZE); |
3ed3a434 DC |
927 | return; |
928 | } | |
929 | ||
1da177e4 | 930 | /* |
89f3b363 CH |
931 | * Write out a dirty page. |
932 | * | |
933 | * For delalloc space on the page we need to allocate space and flush it. | |
934 | * For unwritten space on the page we need to start the conversion to | |
935 | * regular allocated space. | |
89f3b363 | 936 | * For any other dirty buffer heads on the page we should flush them. |
1da177e4 | 937 | */ |
1da177e4 | 938 | STATIC int |
89f3b363 CH |
939 | xfs_vm_writepage( |
940 | struct page *page, | |
941 | struct writeback_control *wbc) | |
1da177e4 | 942 | { |
89f3b363 | 943 | struct inode *inode = page->mapping->host; |
f6d6d4fc | 944 | struct buffer_head *bh, *head; |
207d0416 | 945 | struct xfs_bmbt_irec imap; |
f6d6d4fc | 946 | xfs_ioend_t *ioend = NULL, *iohead = NULL; |
1da177e4 | 947 | loff_t offset; |
f6d6d4fc | 948 | unsigned int type; |
1da177e4 | 949 | __uint64_t end_offset; |
bd1556a1 | 950 | pgoff_t end_index, last_index; |
ed1e7b7e | 951 | ssize_t len; |
a206c817 | 952 | int err, imap_valid = 0, uptodate = 1; |
89f3b363 | 953 | int count = 0; |
a206c817 | 954 | int nonblocking = 0; |
89f3b363 | 955 | |
34097dfe | 956 | trace_xfs_writepage(inode, page, 0, 0); |
89f3b363 | 957 | |
20cb52eb CH |
958 | ASSERT(page_has_buffers(page)); |
959 | ||
89f3b363 CH |
960 | /* |
961 | * Refuse to write the page out if we are called from reclaim context. | |
962 | * | |
d4f7a5cb CH |
963 | * This avoids stack overflows when called from deeply used stacks in |
964 | * random callers for direct reclaim or memcg reclaim. We explicitly | |
965 | * allow reclaim from kswapd as the stack usage there is relatively low. | |
89f3b363 | 966 | * |
94054fa3 MG |
967 | * This should never happen except in the case of a VM regression so |
968 | * warn about it. | |
89f3b363 | 969 | */ |
94054fa3 MG |
970 | if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == |
971 | PF_MEMALLOC)) | |
b5420f23 | 972 | goto redirty; |
1da177e4 | 973 | |
89f3b363 | 974 | /* |
680a647b CH |
975 | * Given that we do not allow direct reclaim to call us, we should |
976 | * never be called while in a filesystem transaction. | |
89f3b363 | 977 | */ |
448011e2 | 978 | if (WARN_ON_ONCE(current->flags & PF_FSTRANS)) |
b5420f23 | 979 | goto redirty; |
89f3b363 | 980 | |
1da177e4 LT |
981 | /* Is this page beyond the end of the file? */ |
982 | offset = i_size_read(inode); | |
983 | end_index = offset >> PAGE_CACHE_SHIFT; | |
984 | last_index = (offset - 1) >> PAGE_CACHE_SHIFT; | |
8695d27e JL |
985 | |
986 | /* | |
987 | * The page index is less than the end_index, adjust the end_offset | |
988 | * to the highest offset that this page should represent. | |
989 | * ----------------------------------------------------- | |
990 | * | file mapping | <EOF> | | |
991 | * ----------------------------------------------------- | |
992 | * | Page ... | Page N-2 | Page N-1 | Page N | | | |
993 | * ^--------------------------------^----------|-------- | |
994 | * | desired writeback range | see else | | |
995 | * ---------------------------------^------------------| | |
996 | */ | |
997 | if (page->index < end_index) | |
998 | end_offset = (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT; | |
999 | else { | |
1000 | /* | |
1001 | * Check whether the page to write out is beyond or straddles | |
1002 | * i_size or not. | |
1003 | * ------------------------------------------------------- | |
1004 | * | file mapping | <EOF> | | |
1005 | * ------------------------------------------------------- | |
1006 | * | Page ... | Page N-2 | Page N-1 | Page N | Beyond | | |
1007 | * ^--------------------------------^-----------|--------- | |
1008 | * | | Straddles | | |
1009 | * ---------------------------------^-----------|--------| | |
1010 | */ | |
6b7a03f0 CH |
1011 | unsigned offset_into_page = offset & (PAGE_CACHE_SIZE - 1); |
1012 | ||
1013 | /* | |
ff9a28f6 JK |
1014 | * Skip the page if it is fully outside i_size, e.g. due to a |
1015 | * truncate operation that is in progress. We must redirty the | |
1016 | * page so that reclaim stops reclaiming it. Otherwise | |
1017 | * xfs_vm_releasepage() is called on it and gets confused. | |
8695d27e JL |
1018 | * |
1019 | * Note that the end_index is unsigned long, it would overflow | |
1020 | * if the given offset is greater than 16TB on 32-bit system | |
1021 | * and if we do check the page is fully outside i_size or not | |
1022 | * via "if (page->index >= end_index + 1)" as "end_index + 1" | |
1023 | * will be evaluated to 0. Hence this page will be redirtied | |
1024 | * and be written out repeatedly which would result in an | |
1025 | * infinite loop, the user program that perform this operation | |
1026 | * will hang. Instead, we can verify this situation by checking | |
1027 | * if the page to write is totally beyond the i_size or if it's | |
1028 | * offset is just equal to the EOF. | |
6b7a03f0 | 1029 | */ |
8695d27e JL |
1030 | if (page->index > end_index || |
1031 | (page->index == end_index && offset_into_page == 0)) | |
ff9a28f6 | 1032 | goto redirty; |
6b7a03f0 CH |
1033 | |
1034 | /* | |
1035 | * The page straddles i_size. It must be zeroed out on each | |
1036 | * and every writepage invocation because it may be mmapped. | |
1037 | * "A file is mapped in multiples of the page size. For a file | |
8695d27e | 1038 | * that is not a multiple of the page size, the remaining |
6b7a03f0 CH |
1039 | * memory is zeroed when mapped, and writes to that region are |
1040 | * not written out to the file." | |
1041 | */ | |
1042 | zero_user_segment(page, offset_into_page, PAGE_CACHE_SIZE); | |
8695d27e JL |
1043 | |
1044 | /* Adjust the end_offset to the end of file */ | |
1045 | end_offset = offset; | |
1da177e4 LT |
1046 | } |
1047 | ||
24e17b5f | 1048 | len = 1 << inode->i_blkbits; |
24e17b5f | 1049 | |
24e17b5f | 1050 | bh = head = page_buffers(page); |
f6d6d4fc | 1051 | offset = page_offset(page); |
0d882a36 | 1052 | type = XFS_IO_OVERWRITE; |
a206c817 | 1053 | |
dbcdde3e | 1054 | if (wbc->sync_mode == WB_SYNC_NONE) |
a206c817 | 1055 | nonblocking = 1; |
f6d6d4fc | 1056 | |
1da177e4 | 1057 | do { |
6ac7248e CH |
1058 | int new_ioend = 0; |
1059 | ||
1da177e4 LT |
1060 | if (offset >= end_offset) |
1061 | break; | |
1062 | if (!buffer_uptodate(bh)) | |
1063 | uptodate = 0; | |
1da177e4 | 1064 | |
3d9b02e3 | 1065 | /* |
ece413f5 CH |
1066 | * set_page_dirty dirties all buffers in a page, independent |
1067 | * of their state. The dirty state however is entirely | |
1068 | * meaningless for holes (!mapped && uptodate), so skip | |
1069 | * buffers covering holes here. | |
3d9b02e3 ES |
1070 | */ |
1071 | if (!buffer_mapped(bh) && buffer_uptodate(bh)) { | |
3d9b02e3 ES |
1072 | imap_valid = 0; |
1073 | continue; | |
1074 | } | |
1075 | ||
aeea1b1f | 1076 | if (buffer_unwritten(bh)) { |
0d882a36 AR |
1077 | if (type != XFS_IO_UNWRITTEN) { |
1078 | type = XFS_IO_UNWRITTEN; | |
aeea1b1f | 1079 | imap_valid = 0; |
1da177e4 | 1080 | } |
aeea1b1f | 1081 | } else if (buffer_delay(bh)) { |
0d882a36 AR |
1082 | if (type != XFS_IO_DELALLOC) { |
1083 | type = XFS_IO_DELALLOC; | |
aeea1b1f | 1084 | imap_valid = 0; |
1da177e4 | 1085 | } |
89f3b363 | 1086 | } else if (buffer_uptodate(bh)) { |
0d882a36 AR |
1087 | if (type != XFS_IO_OVERWRITE) { |
1088 | type = XFS_IO_OVERWRITE; | |
85da94c6 CH |
1089 | imap_valid = 0; |
1090 | } | |
aeea1b1f | 1091 | } else { |
7d0fa3ec | 1092 | if (PageUptodate(page)) |
aeea1b1f | 1093 | ASSERT(buffer_mapped(bh)); |
7d0fa3ec AR |
1094 | /* |
1095 | * This buffer is not uptodate and will not be | |
1096 | * written to disk. Ensure that we will put any | |
1097 | * subsequent writeable buffers into a new | |
1098 | * ioend. | |
1099 | */ | |
1100 | imap_valid = 0; | |
aeea1b1f CH |
1101 | continue; |
1102 | } | |
d5cb48aa | 1103 | |
aeea1b1f CH |
1104 | if (imap_valid) |
1105 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1106 | if (!imap_valid) { | |
1107 | /* | |
1108 | * If we didn't have a valid mapping then we need to | |
1109 | * put the new mapping into a separate ioend structure. | |
1110 | * This ensures non-contiguous extents always have | |
1111 | * separate ioends, which is particularly important | |
1112 | * for unwritten extent conversion at I/O completion | |
1113 | * time. | |
1114 | */ | |
1115 | new_ioend = 1; | |
1116 | err = xfs_map_blocks(inode, offset, &imap, type, | |
1117 | nonblocking); | |
1118 | if (err) | |
1119 | goto error; | |
1120 | imap_valid = xfs_imap_valid(inode, &imap, offset); | |
1121 | } | |
1122 | if (imap_valid) { | |
ecff71e6 | 1123 | lock_buffer(bh); |
0d882a36 | 1124 | if (type != XFS_IO_OVERWRITE) |
aeea1b1f CH |
1125 | xfs_map_at_offset(inode, bh, &imap, offset); |
1126 | xfs_add_to_ioend(inode, bh, offset, type, &ioend, | |
1127 | new_ioend); | |
1128 | count++; | |
1da177e4 | 1129 | } |
f6d6d4fc CH |
1130 | |
1131 | if (!iohead) | |
1132 | iohead = ioend; | |
1133 | ||
1134 | } while (offset += len, ((bh = bh->b_this_page) != head)); | |
1da177e4 LT |
1135 | |
1136 | if (uptodate && bh == head) | |
1137 | SetPageUptodate(page); | |
1138 | ||
89f3b363 | 1139 | xfs_start_page_writeback(page, 1, count); |
1da177e4 | 1140 | |
7bf7f352 DC |
1141 | /* if there is no IO to be submitted for this page, we are done */ |
1142 | if (!ioend) | |
1143 | return 0; | |
1144 | ||
1145 | ASSERT(iohead); | |
1146 | ||
1147 | /* | |
1148 | * Any errors from this point onwards need tobe reported through the IO | |
1149 | * completion path as we have marked the initial page as under writeback | |
1150 | * and unlocked it. | |
1151 | */ | |
1152 | if (imap_valid) { | |
bd1556a1 CH |
1153 | xfs_off_t end_index; |
1154 | ||
1155 | end_index = imap.br_startoff + imap.br_blockcount; | |
1156 | ||
1157 | /* to bytes */ | |
1158 | end_index <<= inode->i_blkbits; | |
1159 | ||
1160 | /* to pages */ | |
1161 | end_index = (end_index - 1) >> PAGE_CACHE_SHIFT; | |
1162 | ||
1163 | /* check against file size */ | |
1164 | if (end_index > last_index) | |
1165 | end_index = last_index; | |
8699bb0a | 1166 | |
207d0416 | 1167 | xfs_cluster_write(inode, page->index + 1, &imap, &ioend, |
2fa24f92 | 1168 | wbc, end_index); |
1da177e4 LT |
1169 | } |
1170 | ||
281627df | 1171 | |
7bf7f352 DC |
1172 | /* |
1173 | * Reserve log space if we might write beyond the on-disk inode size. | |
1174 | */ | |
1175 | err = 0; | |
1176 | if (ioend->io_type != XFS_IO_UNWRITTEN && xfs_ioend_is_append(ioend)) | |
1177 | err = xfs_setfilesize_trans_alloc(ioend); | |
1178 | ||
1179 | xfs_submit_ioend(wbc, iohead, err); | |
f6d6d4fc | 1180 | |
89f3b363 | 1181 | return 0; |
1da177e4 LT |
1182 | |
1183 | error: | |
f6d6d4fc CH |
1184 | if (iohead) |
1185 | xfs_cancel_ioend(iohead); | |
1da177e4 | 1186 | |
b5420f23 CH |
1187 | if (err == -EAGAIN) |
1188 | goto redirty; | |
1189 | ||
20cb52eb | 1190 | xfs_aops_discard_page(page); |
89f3b363 CH |
1191 | ClearPageUptodate(page); |
1192 | unlock_page(page); | |
1da177e4 | 1193 | return err; |
f51623b2 | 1194 | |
b5420f23 | 1195 | redirty: |
f51623b2 NS |
1196 | redirty_page_for_writepage(wbc, page); |
1197 | unlock_page(page); | |
1198 | return 0; | |
f51623b2 NS |
1199 | } |
1200 | ||
7d4fb40a NS |
1201 | STATIC int |
1202 | xfs_vm_writepages( | |
1203 | struct address_space *mapping, | |
1204 | struct writeback_control *wbc) | |
1205 | { | |
b3aea4ed | 1206 | xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED); |
7d4fb40a NS |
1207 | return generic_writepages(mapping, wbc); |
1208 | } | |
1209 | ||
f51623b2 NS |
1210 | /* |
1211 | * Called to move a page into cleanable state - and from there | |
89f3b363 | 1212 | * to be released. The page should already be clean. We always |
f51623b2 NS |
1213 | * have buffer heads in this call. |
1214 | * | |
89f3b363 | 1215 | * Returns 1 if the page is ok to release, 0 otherwise. |
f51623b2 NS |
1216 | */ |
1217 | STATIC int | |
238f4c54 | 1218 | xfs_vm_releasepage( |
f51623b2 NS |
1219 | struct page *page, |
1220 | gfp_t gfp_mask) | |
1221 | { | |
20cb52eb | 1222 | int delalloc, unwritten; |
f51623b2 | 1223 | |
34097dfe | 1224 | trace_xfs_releasepage(page->mapping->host, page, 0, 0); |
238f4c54 | 1225 | |
20cb52eb | 1226 | xfs_count_page_state(page, &delalloc, &unwritten); |
f51623b2 | 1227 | |
448011e2 | 1228 | if (WARN_ON_ONCE(delalloc)) |
f51623b2 | 1229 | return 0; |
448011e2 | 1230 | if (WARN_ON_ONCE(unwritten)) |
f51623b2 NS |
1231 | return 0; |
1232 | ||
f51623b2 NS |
1233 | return try_to_free_buffers(page); |
1234 | } | |
1235 | ||
a719370b DC |
1236 | /* |
1237 | * do all the direct IO specific mapping buffer manipulation here. | |
1238 | */ | |
1239 | static void | |
1240 | xfs_map_direct( | |
1241 | struct inode *inode, | |
1242 | struct buffer_head *bh_result, | |
1243 | struct xfs_bmbt_irec *imap, | |
1244 | xfs_off_t offset) | |
1245 | { | |
1246 | if (ISUNWRITTEN(imap)) { | |
1247 | bh_result->b_private = inode; | |
1248 | set_buffer_defer_completion(bh_result); | |
1249 | } | |
1250 | } | |
1251 | ||
1fdca9c2 DC |
1252 | |
1253 | /* | |
1254 | * If this is O_DIRECT or the mpage code calling tell them how large the mapping | |
1255 | * is, so that we can avoid repeated get_blocks calls. | |
1256 | * | |
1257 | * If the mapping spans EOF, then we have to break the mapping up as the mapping | |
1258 | * for blocks beyond EOF must be marked new so that sub block regions can be | |
1259 | * correctly zeroed. We can't do this for mappings within EOF unless the mapping | |
1260 | * was just allocated or is unwritten, otherwise the callers would overwrite | |
1261 | * existing data with zeros. Hence we have to split the mapping into a range up | |
1262 | * to and including EOF, and a second mapping for beyond EOF. | |
1263 | */ | |
1264 | static void | |
1265 | xfs_map_trim_size( | |
1266 | struct inode *inode, | |
1267 | sector_t iblock, | |
1268 | struct buffer_head *bh_result, | |
1269 | struct xfs_bmbt_irec *imap, | |
1270 | xfs_off_t offset, | |
1271 | ssize_t size) | |
1272 | { | |
1273 | xfs_off_t mapping_size; | |
1274 | ||
1275 | mapping_size = imap->br_startoff + imap->br_blockcount - iblock; | |
1276 | mapping_size <<= inode->i_blkbits; | |
1277 | ||
1278 | ASSERT(mapping_size > 0); | |
1279 | if (mapping_size > size) | |
1280 | mapping_size = size; | |
1281 | if (offset < i_size_read(inode) && | |
1282 | offset + mapping_size >= i_size_read(inode)) { | |
1283 | /* limit mapping to block that spans EOF */ | |
1284 | mapping_size = roundup_64(i_size_read(inode) - offset, | |
1285 | 1 << inode->i_blkbits); | |
1286 | } | |
1287 | if (mapping_size > LONG_MAX) | |
1288 | mapping_size = LONG_MAX; | |
1289 | ||
1290 | bh_result->b_size = mapping_size; | |
1291 | } | |
1292 | ||
1da177e4 | 1293 | STATIC int |
c2536668 | 1294 | __xfs_get_blocks( |
1da177e4 LT |
1295 | struct inode *inode, |
1296 | sector_t iblock, | |
1da177e4 LT |
1297 | struct buffer_head *bh_result, |
1298 | int create, | |
f2bde9b8 | 1299 | int direct) |
1da177e4 | 1300 | { |
a206c817 CH |
1301 | struct xfs_inode *ip = XFS_I(inode); |
1302 | struct xfs_mount *mp = ip->i_mount; | |
1303 | xfs_fileoff_t offset_fsb, end_fsb; | |
1304 | int error = 0; | |
1305 | int lockmode = 0; | |
207d0416 | 1306 | struct xfs_bmbt_irec imap; |
a206c817 | 1307 | int nimaps = 1; |
fdc7ed75 NS |
1308 | xfs_off_t offset; |
1309 | ssize_t size; | |
207d0416 | 1310 | int new = 0; |
a206c817 CH |
1311 | |
1312 | if (XFS_FORCED_SHUTDOWN(mp)) | |
b474c7ae | 1313 | return -EIO; |
1da177e4 | 1314 | |
fdc7ed75 | 1315 | offset = (xfs_off_t)iblock << inode->i_blkbits; |
c2536668 NS |
1316 | ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); |
1317 | size = bh_result->b_size; | |
364f358a LM |
1318 | |
1319 | if (!create && direct && offset >= i_size_read(inode)) | |
1320 | return 0; | |
1321 | ||
507630b2 DC |
1322 | /* |
1323 | * Direct I/O is usually done on preallocated files, so try getting | |
1324 | * a block mapping without an exclusive lock first. For buffered | |
1325 | * writes we already have the exclusive iolock anyway, so avoiding | |
1326 | * a lock roundtrip here by taking the ilock exclusive from the | |
1327 | * beginning is a useful micro optimization. | |
1328 | */ | |
1329 | if (create && !direct) { | |
a206c817 CH |
1330 | lockmode = XFS_ILOCK_EXCL; |
1331 | xfs_ilock(ip, lockmode); | |
1332 | } else { | |
309ecac8 | 1333 | lockmode = xfs_ilock_data_map_shared(ip); |
a206c817 | 1334 | } |
f2bde9b8 | 1335 | |
d2c28191 DC |
1336 | ASSERT(offset <= mp->m_super->s_maxbytes); |
1337 | if (offset + size > mp->m_super->s_maxbytes) | |
1338 | size = mp->m_super->s_maxbytes - offset; | |
a206c817 CH |
1339 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); |
1340 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1341 | ||
5c8ed202 DC |
1342 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, |
1343 | &imap, &nimaps, XFS_BMAPI_ENTIRE); | |
1da177e4 | 1344 | if (error) |
a206c817 CH |
1345 | goto out_unlock; |
1346 | ||
1347 | if (create && | |
1348 | (!nimaps || | |
1349 | (imap.br_startblock == HOLESTARTBLOCK || | |
1350 | imap.br_startblock == DELAYSTARTBLOCK))) { | |
aff3a9ed | 1351 | if (direct || xfs_get_extsz_hint(ip)) { |
507630b2 DC |
1352 | /* |
1353 | * Drop the ilock in preparation for starting the block | |
1354 | * allocation transaction. It will be retaken | |
1355 | * exclusively inside xfs_iomap_write_direct for the | |
1356 | * actual allocation. | |
1357 | */ | |
1358 | xfs_iunlock(ip, lockmode); | |
a206c817 CH |
1359 | error = xfs_iomap_write_direct(ip, offset, size, |
1360 | &imap, nimaps); | |
507630b2 | 1361 | if (error) |
2451337d | 1362 | return error; |
d3bc815a | 1363 | new = 1; |
a206c817 | 1364 | } else { |
507630b2 DC |
1365 | /* |
1366 | * Delalloc reservations do not require a transaction, | |
d3bc815a DC |
1367 | * we can go on without dropping the lock here. If we |
1368 | * are allocating a new delalloc block, make sure that | |
1369 | * we set the new flag so that we mark the buffer new so | |
1370 | * that we know that it is newly allocated if the write | |
1371 | * fails. | |
507630b2 | 1372 | */ |
d3bc815a DC |
1373 | if (nimaps && imap.br_startblock == HOLESTARTBLOCK) |
1374 | new = 1; | |
a206c817 | 1375 | error = xfs_iomap_write_delay(ip, offset, size, &imap); |
507630b2 DC |
1376 | if (error) |
1377 | goto out_unlock; | |
1378 | ||
1379 | xfs_iunlock(ip, lockmode); | |
a206c817 | 1380 | } |
a206c817 CH |
1381 | |
1382 | trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap); | |
1383 | } else if (nimaps) { | |
1384 | trace_xfs_get_blocks_found(ip, offset, size, 0, &imap); | |
507630b2 | 1385 | xfs_iunlock(ip, lockmode); |
a206c817 CH |
1386 | } else { |
1387 | trace_xfs_get_blocks_notfound(ip, offset, size); | |
1388 | goto out_unlock; | |
1389 | } | |
1da177e4 | 1390 | |
1fdca9c2 DC |
1391 | /* trim mapping down to size requested */ |
1392 | if (direct || size > (1 << inode->i_blkbits)) | |
1393 | xfs_map_trim_size(inode, iblock, bh_result, | |
1394 | &imap, offset, size); | |
1395 | ||
a719370b DC |
1396 | /* |
1397 | * For unwritten extents do not report a disk address in the buffered | |
1398 | * read case (treat as if we're reading into a hole). | |
1399 | */ | |
207d0416 | 1400 | if (imap.br_startblock != HOLESTARTBLOCK && |
a719370b DC |
1401 | imap.br_startblock != DELAYSTARTBLOCK && |
1402 | (create || !ISUNWRITTEN(&imap))) { | |
1403 | xfs_map_buffer(inode, bh_result, &imap, offset); | |
1404 | if (ISUNWRITTEN(&imap)) | |
1da177e4 | 1405 | set_buffer_unwritten(bh_result); |
a719370b DC |
1406 | /* direct IO needs special help */ |
1407 | if (create && direct) | |
1408 | xfs_map_direct(inode, bh_result, &imap, offset); | |
1da177e4 LT |
1409 | } |
1410 | ||
c2536668 NS |
1411 | /* |
1412 | * If this is a realtime file, data may be on a different device. | |
1413 | * to that pointed to from the buffer_head b_bdev currently. | |
1414 | */ | |
046f1685 | 1415 | bh_result->b_bdev = xfs_find_bdev_for_inode(inode); |
1da177e4 | 1416 | |
c2536668 | 1417 | /* |
549054af DC |
1418 | * If we previously allocated a block out beyond eof and we are now |
1419 | * coming back to use it then we will need to flag it as new even if it | |
1420 | * has a disk address. | |
1421 | * | |
1422 | * With sub-block writes into unwritten extents we also need to mark | |
1423 | * the buffer as new so that the unwritten parts of the buffer gets | |
1424 | * correctly zeroed. | |
1da177e4 LT |
1425 | */ |
1426 | if (create && | |
1427 | ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || | |
549054af | 1428 | (offset >= i_size_read(inode)) || |
207d0416 | 1429 | (new || ISUNWRITTEN(&imap)))) |
1da177e4 | 1430 | set_buffer_new(bh_result); |
1da177e4 | 1431 | |
207d0416 | 1432 | if (imap.br_startblock == DELAYSTARTBLOCK) { |
1da177e4 LT |
1433 | BUG_ON(direct); |
1434 | if (create) { | |
1435 | set_buffer_uptodate(bh_result); | |
1436 | set_buffer_mapped(bh_result); | |
1437 | set_buffer_delay(bh_result); | |
1438 | } | |
1439 | } | |
1440 | ||
1da177e4 | 1441 | return 0; |
a206c817 CH |
1442 | |
1443 | out_unlock: | |
1444 | xfs_iunlock(ip, lockmode); | |
2451337d | 1445 | return error; |
1da177e4 LT |
1446 | } |
1447 | ||
1448 | int | |
c2536668 | 1449 | xfs_get_blocks( |
1da177e4 LT |
1450 | struct inode *inode, |
1451 | sector_t iblock, | |
1452 | struct buffer_head *bh_result, | |
1453 | int create) | |
1454 | { | |
f2bde9b8 | 1455 | return __xfs_get_blocks(inode, iblock, bh_result, create, 0); |
1da177e4 LT |
1456 | } |
1457 | ||
1458 | STATIC int | |
e4c573bb | 1459 | xfs_get_blocks_direct( |
1da177e4 LT |
1460 | struct inode *inode, |
1461 | sector_t iblock, | |
1da177e4 LT |
1462 | struct buffer_head *bh_result, |
1463 | int create) | |
1464 | { | |
f2bde9b8 | 1465 | return __xfs_get_blocks(inode, iblock, bh_result, create, 1); |
1da177e4 LT |
1466 | } |
1467 | ||
209fb87a CH |
1468 | /* |
1469 | * Complete a direct I/O write request. | |
1470 | * | |
1471 | * If the private argument is non-NULL __xfs_get_blocks signals us that we | |
1472 | * need to issue a transaction to convert the range from unwritten to written | |
2ba66237 | 1473 | * extents. |
209fb87a | 1474 | */ |
f0973863 | 1475 | STATIC void |
209fb87a CH |
1476 | xfs_end_io_direct_write( |
1477 | struct kiocb *iocb, | |
1478 | loff_t offset, | |
1479 | ssize_t size, | |
7b7a8665 | 1480 | void *private) |
f0973863 | 1481 | { |
2ba66237 CH |
1482 | struct inode *inode = file_inode(iocb->ki_filp); |
1483 | struct xfs_inode *ip = XFS_I(inode); | |
1484 | struct xfs_mount *mp = ip->i_mount; | |
1485 | ||
1486 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1487 | return; | |
f0973863 | 1488 | |
2813d682 CH |
1489 | /* |
1490 | * While the generic direct I/O code updates the inode size, it does | |
1491 | * so only after the end_io handler is called, which means our | |
1492 | * end_io handler thinks the on-disk size is outside the in-core | |
1493 | * size. To prevent this just update it a little bit earlier here. | |
1494 | */ | |
2ba66237 CH |
1495 | if (offset + size > i_size_read(inode)) |
1496 | i_size_write(inode, offset + size); | |
2813d682 | 1497 | |
f0973863 | 1498 | /* |
2ba66237 CH |
1499 | * For direct I/O we do not know if we need to allocate blocks or not, |
1500 | * so we can't preallocate an append transaction, as that results in | |
1501 | * nested reservations and log space deadlocks. Hence allocate the | |
1502 | * transaction here. While this is sub-optimal and can block IO | |
1503 | * completion for some time, we're stuck with doing it this way until | |
1504 | * we can pass the ioend to the direct IO allocation callbacks and | |
1505 | * avoid nesting that way. | |
f0973863 | 1506 | */ |
2ba66237 CH |
1507 | if (private && size > 0) { |
1508 | xfs_iomap_write_unwritten(ip, offset, size); | |
1509 | } else if (offset + size > ip->i_d.di_size) { | |
1510 | struct xfs_trans *tp; | |
1511 | int error; | |
1512 | ||
1513 | tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); | |
1514 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0); | |
1515 | if (error) { | |
1516 | xfs_trans_cancel(tp, 0); | |
1517 | return; | |
1518 | } | |
209fb87a | 1519 | |
2ba66237 CH |
1520 | xfs_setfilesize(ip, tp, offset, size); |
1521 | } | |
f0973863 CH |
1522 | } |
1523 | ||
1da177e4 | 1524 | STATIC ssize_t |
e4c573bb | 1525 | xfs_vm_direct_IO( |
1da177e4 LT |
1526 | int rw, |
1527 | struct kiocb *iocb, | |
d8d3d94b AV |
1528 | struct iov_iter *iter, |
1529 | loff_t offset) | |
1da177e4 | 1530 | { |
209fb87a CH |
1531 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
1532 | struct block_device *bdev = xfs_find_bdev_for_inode(inode); | |
209fb87a CH |
1533 | |
1534 | if (rw & WRITE) { | |
2ba66237 | 1535 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iter, |
31b14039 | 1536 | offset, xfs_get_blocks_direct, |
9862f62f CH |
1537 | xfs_end_io_direct_write, NULL, |
1538 | DIO_ASYNC_EXTEND); | |
209fb87a | 1539 | } |
2ba66237 CH |
1540 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iter, |
1541 | offset, xfs_get_blocks_direct, | |
1542 | NULL, NULL, 0); | |
1da177e4 LT |
1543 | } |
1544 | ||
d3bc815a DC |
1545 | /* |
1546 | * Punch out the delalloc blocks we have already allocated. | |
1547 | * | |
1548 | * Don't bother with xfs_setattr given that nothing can have made it to disk yet | |
1549 | * as the page is still locked at this point. | |
1550 | */ | |
1551 | STATIC void | |
1552 | xfs_vm_kill_delalloc_range( | |
1553 | struct inode *inode, | |
1554 | loff_t start, | |
1555 | loff_t end) | |
1556 | { | |
1557 | struct xfs_inode *ip = XFS_I(inode); | |
1558 | xfs_fileoff_t start_fsb; | |
1559 | xfs_fileoff_t end_fsb; | |
1560 | int error; | |
1561 | ||
1562 | start_fsb = XFS_B_TO_FSB(ip->i_mount, start); | |
1563 | end_fsb = XFS_B_TO_FSB(ip->i_mount, end); | |
1564 | if (end_fsb <= start_fsb) | |
1565 | return; | |
1566 | ||
1567 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1568 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, | |
1569 | end_fsb - start_fsb); | |
1570 | if (error) { | |
1571 | /* something screwed, just bail */ | |
1572 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
1573 | xfs_alert(ip->i_mount, | |
1574 | "xfs_vm_write_failed: unable to clean up ino %lld", | |
1575 | ip->i_ino); | |
1576 | } | |
1577 | } | |
1578 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1579 | } | |
1580 | ||
fa9b227e CH |
1581 | STATIC void |
1582 | xfs_vm_write_failed( | |
d3bc815a DC |
1583 | struct inode *inode, |
1584 | struct page *page, | |
1585 | loff_t pos, | |
1586 | unsigned len) | |
fa9b227e | 1587 | { |
58e59854 | 1588 | loff_t block_offset; |
d3bc815a DC |
1589 | loff_t block_start; |
1590 | loff_t block_end; | |
1591 | loff_t from = pos & (PAGE_CACHE_SIZE - 1); | |
1592 | loff_t to = from + len; | |
1593 | struct buffer_head *bh, *head; | |
fa9b227e | 1594 | |
58e59854 JL |
1595 | /* |
1596 | * The request pos offset might be 32 or 64 bit, this is all fine | |
1597 | * on 64-bit platform. However, for 64-bit pos request on 32-bit | |
1598 | * platform, the high 32-bit will be masked off if we evaluate the | |
1599 | * block_offset via (pos & PAGE_MASK) because the PAGE_MASK is | |
1600 | * 0xfffff000 as an unsigned long, hence the result is incorrect | |
1601 | * which could cause the following ASSERT failed in most cases. | |
1602 | * In order to avoid this, we can evaluate the block_offset of the | |
1603 | * start of the page by using shifts rather than masks the mismatch | |
1604 | * problem. | |
1605 | */ | |
1606 | block_offset = (pos >> PAGE_CACHE_SHIFT) << PAGE_CACHE_SHIFT; | |
1607 | ||
d3bc815a | 1608 | ASSERT(block_offset + from == pos); |
c726de44 | 1609 | |
d3bc815a DC |
1610 | head = page_buffers(page); |
1611 | block_start = 0; | |
1612 | for (bh = head; bh != head || !block_start; | |
1613 | bh = bh->b_this_page, block_start = block_end, | |
1614 | block_offset += bh->b_size) { | |
1615 | block_end = block_start + bh->b_size; | |
c726de44 | 1616 | |
d3bc815a DC |
1617 | /* skip buffers before the write */ |
1618 | if (block_end <= from) | |
1619 | continue; | |
1620 | ||
1621 | /* if the buffer is after the write, we're done */ | |
1622 | if (block_start >= to) | |
1623 | break; | |
1624 | ||
1625 | if (!buffer_delay(bh)) | |
1626 | continue; | |
1627 | ||
1628 | if (!buffer_new(bh) && block_offset < i_size_read(inode)) | |
1629 | continue; | |
1630 | ||
1631 | xfs_vm_kill_delalloc_range(inode, block_offset, | |
1632 | block_offset + bh->b_size); | |
4ab9ed57 DC |
1633 | |
1634 | /* | |
1635 | * This buffer does not contain data anymore. make sure anyone | |
1636 | * who finds it knows that for certain. | |
1637 | */ | |
1638 | clear_buffer_delay(bh); | |
1639 | clear_buffer_uptodate(bh); | |
1640 | clear_buffer_mapped(bh); | |
1641 | clear_buffer_new(bh); | |
1642 | clear_buffer_dirty(bh); | |
fa9b227e | 1643 | } |
d3bc815a | 1644 | |
fa9b227e CH |
1645 | } |
1646 | ||
d3bc815a DC |
1647 | /* |
1648 | * This used to call block_write_begin(), but it unlocks and releases the page | |
1649 | * on error, and we need that page to be able to punch stale delalloc blocks out | |
1650 | * on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at | |
1651 | * the appropriate point. | |
1652 | */ | |
f51623b2 | 1653 | STATIC int |
d79689c7 | 1654 | xfs_vm_write_begin( |
f51623b2 | 1655 | struct file *file, |
d79689c7 NP |
1656 | struct address_space *mapping, |
1657 | loff_t pos, | |
1658 | unsigned len, | |
1659 | unsigned flags, | |
1660 | struct page **pagep, | |
1661 | void **fsdata) | |
f51623b2 | 1662 | { |
d3bc815a DC |
1663 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
1664 | struct page *page; | |
1665 | int status; | |
155130a4 | 1666 | |
d3bc815a DC |
1667 | ASSERT(len <= PAGE_CACHE_SIZE); |
1668 | ||
ad22c7a0 | 1669 | page = grab_cache_page_write_begin(mapping, index, flags); |
d3bc815a DC |
1670 | if (!page) |
1671 | return -ENOMEM; | |
1672 | ||
1673 | status = __block_write_begin(page, pos, len, xfs_get_blocks); | |
1674 | if (unlikely(status)) { | |
1675 | struct inode *inode = mapping->host; | |
72ab70a1 | 1676 | size_t isize = i_size_read(inode); |
d3bc815a DC |
1677 | |
1678 | xfs_vm_write_failed(inode, page, pos, len); | |
1679 | unlock_page(page); | |
1680 | ||
72ab70a1 DC |
1681 | /* |
1682 | * If the write is beyond EOF, we only want to kill blocks | |
1683 | * allocated in this write, not blocks that were previously | |
1684 | * written successfully. | |
1685 | */ | |
1686 | if (pos + len > isize) { | |
1687 | ssize_t start = max_t(ssize_t, pos, isize); | |
1688 | ||
1689 | truncate_pagecache_range(inode, start, pos + len); | |
1690 | } | |
d3bc815a DC |
1691 | |
1692 | page_cache_release(page); | |
1693 | page = NULL; | |
1694 | } | |
1695 | ||
1696 | *pagep = page; | |
1697 | return status; | |
fa9b227e CH |
1698 | } |
1699 | ||
d3bc815a | 1700 | /* |
aad3f375 DC |
1701 | * On failure, we only need to kill delalloc blocks beyond EOF in the range of |
1702 | * this specific write because they will never be written. Previous writes | |
1703 | * beyond EOF where block allocation succeeded do not need to be trashed, so | |
1704 | * only new blocks from this write should be trashed. For blocks within | |
1705 | * EOF, generic_write_end() zeros them so they are safe to leave alone and be | |
1706 | * written with all the other valid data. | |
d3bc815a | 1707 | */ |
fa9b227e CH |
1708 | STATIC int |
1709 | xfs_vm_write_end( | |
1710 | struct file *file, | |
1711 | struct address_space *mapping, | |
1712 | loff_t pos, | |
1713 | unsigned len, | |
1714 | unsigned copied, | |
1715 | struct page *page, | |
1716 | void *fsdata) | |
1717 | { | |
1718 | int ret; | |
155130a4 | 1719 | |
d3bc815a DC |
1720 | ASSERT(len <= PAGE_CACHE_SIZE); |
1721 | ||
fa9b227e | 1722 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
d3bc815a DC |
1723 | if (unlikely(ret < len)) { |
1724 | struct inode *inode = mapping->host; | |
1725 | size_t isize = i_size_read(inode); | |
1726 | loff_t to = pos + len; | |
1727 | ||
1728 | if (to > isize) { | |
aad3f375 DC |
1729 | /* only kill blocks in this write beyond EOF */ |
1730 | if (pos > isize) | |
1731 | isize = pos; | |
d3bc815a | 1732 | xfs_vm_kill_delalloc_range(inode, isize, to); |
aad3f375 | 1733 | truncate_pagecache_range(inode, isize, to); |
d3bc815a DC |
1734 | } |
1735 | } | |
155130a4 | 1736 | return ret; |
f51623b2 | 1737 | } |
1da177e4 LT |
1738 | |
1739 | STATIC sector_t | |
e4c573bb | 1740 | xfs_vm_bmap( |
1da177e4 LT |
1741 | struct address_space *mapping, |
1742 | sector_t block) | |
1743 | { | |
1744 | struct inode *inode = (struct inode *)mapping->host; | |
739bfb2a | 1745 | struct xfs_inode *ip = XFS_I(inode); |
1da177e4 | 1746 | |
cca28fb8 | 1747 | trace_xfs_vm_bmap(XFS_I(inode)); |
126468b1 | 1748 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
4bc1ea6b | 1749 | filemap_write_and_wait(mapping); |
126468b1 | 1750 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
c2536668 | 1751 | return generic_block_bmap(mapping, block, xfs_get_blocks); |
1da177e4 LT |
1752 | } |
1753 | ||
1754 | STATIC int | |
e4c573bb | 1755 | xfs_vm_readpage( |
1da177e4 LT |
1756 | struct file *unused, |
1757 | struct page *page) | |
1758 | { | |
c2536668 | 1759 | return mpage_readpage(page, xfs_get_blocks); |
1da177e4 LT |
1760 | } |
1761 | ||
1762 | STATIC int | |
e4c573bb | 1763 | xfs_vm_readpages( |
1da177e4 LT |
1764 | struct file *unused, |
1765 | struct address_space *mapping, | |
1766 | struct list_head *pages, | |
1767 | unsigned nr_pages) | |
1768 | { | |
c2536668 | 1769 | return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks); |
1da177e4 LT |
1770 | } |
1771 | ||
22e757a4 DC |
1772 | /* |
1773 | * This is basically a copy of __set_page_dirty_buffers() with one | |
1774 | * small tweak: buffers beyond EOF do not get marked dirty. If we mark them | |
1775 | * dirty, we'll never be able to clean them because we don't write buffers | |
1776 | * beyond EOF, and that means we can't invalidate pages that span EOF | |
1777 | * that have been marked dirty. Further, the dirty state can leak into | |
1778 | * the file interior if the file is extended, resulting in all sorts of | |
1779 | * bad things happening as the state does not match the underlying data. | |
1780 | * | |
1781 | * XXX: this really indicates that bufferheads in XFS need to die. Warts like | |
1782 | * this only exist because of bufferheads and how the generic code manages them. | |
1783 | */ | |
1784 | STATIC int | |
1785 | xfs_vm_set_page_dirty( | |
1786 | struct page *page) | |
1787 | { | |
1788 | struct address_space *mapping = page->mapping; | |
1789 | struct inode *inode = mapping->host; | |
1790 | loff_t end_offset; | |
1791 | loff_t offset; | |
1792 | int newly_dirty; | |
1793 | ||
1794 | if (unlikely(!mapping)) | |
1795 | return !TestSetPageDirty(page); | |
1796 | ||
1797 | end_offset = i_size_read(inode); | |
1798 | offset = page_offset(page); | |
1799 | ||
1800 | spin_lock(&mapping->private_lock); | |
1801 | if (page_has_buffers(page)) { | |
1802 | struct buffer_head *head = page_buffers(page); | |
1803 | struct buffer_head *bh = head; | |
1804 | ||
1805 | do { | |
1806 | if (offset < end_offset) | |
1807 | set_buffer_dirty(bh); | |
1808 | bh = bh->b_this_page; | |
1809 | offset += 1 << inode->i_blkbits; | |
1810 | } while (bh != head); | |
1811 | } | |
1812 | newly_dirty = !TestSetPageDirty(page); | |
1813 | spin_unlock(&mapping->private_lock); | |
1814 | ||
1815 | if (newly_dirty) { | |
1816 | /* sigh - __set_page_dirty() is static, so copy it here, too */ | |
1817 | unsigned long flags; | |
1818 | ||
1819 | spin_lock_irqsave(&mapping->tree_lock, flags); | |
1820 | if (page->mapping) { /* Race with truncate? */ | |
1821 | WARN_ON_ONCE(!PageUptodate(page)); | |
1822 | account_page_dirtied(page, mapping); | |
1823 | radix_tree_tag_set(&mapping->page_tree, | |
1824 | page_index(page), PAGECACHE_TAG_DIRTY); | |
1825 | } | |
1826 | spin_unlock_irqrestore(&mapping->tree_lock, flags); | |
1827 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); | |
1828 | } | |
1829 | return newly_dirty; | |
1830 | } | |
1831 | ||
f5e54d6e | 1832 | const struct address_space_operations xfs_address_space_operations = { |
e4c573bb NS |
1833 | .readpage = xfs_vm_readpage, |
1834 | .readpages = xfs_vm_readpages, | |
1835 | .writepage = xfs_vm_writepage, | |
7d4fb40a | 1836 | .writepages = xfs_vm_writepages, |
22e757a4 | 1837 | .set_page_dirty = xfs_vm_set_page_dirty, |
238f4c54 NS |
1838 | .releasepage = xfs_vm_releasepage, |
1839 | .invalidatepage = xfs_vm_invalidatepage, | |
d79689c7 | 1840 | .write_begin = xfs_vm_write_begin, |
fa9b227e | 1841 | .write_end = xfs_vm_write_end, |
e4c573bb NS |
1842 | .bmap = xfs_vm_bmap, |
1843 | .direct_IO = xfs_vm_direct_IO, | |
e965f963 | 1844 | .migratepage = buffer_migrate_page, |
bddaafa1 | 1845 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1846 | .error_remove_page = generic_error_remove_page, |
1da177e4 | 1847 | }; |