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[PATCH] Alpha: convert to generic irq framework (generic part)
[pv_ops_mirror.git] / fs / xfs / xfs_iomap.c
blob45a77a3a6c07ed60b2a4fe041c6496c5ded3e1a5
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_bit.h"
21 #include "xfs_log.h"
22 #include "xfs_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_dir.h"
27 #include "xfs_dir2.h"
28 #include "xfs_alloc.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_quota.h"
31 #include "xfs_mount.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_ialloc_btree.h"
35 #include "xfs_dir_sf.h"
36 #include "xfs_dir2_sf.h"
37 #include "xfs_attr_sf.h"
38 #include "xfs_dinode.h"
39 #include "xfs_inode.h"
40 #include "xfs_ialloc.h"
41 #include "xfs_btree.h"
42 #include "xfs_bmap.h"
43 #include "xfs_bit.h"
44 #include "xfs_rtalloc.h"
45 #include "xfs_error.h"
46 #include "xfs_itable.h"
47 #include "xfs_rw.h"
48 #include "xfs_acl.h"
49 #include "xfs_cap.h"
50 #include "xfs_mac.h"
51 #include "xfs_attr.h"
52 #include "xfs_buf_item.h"
53 #include "xfs_trans_space.h"
54 #include "xfs_utils.h"
55 #include "xfs_iomap.h"
56
57 #if defined(XFS_RW_TRACE)
58 void
59 xfs_iomap_enter_trace(
60 int tag,
61 xfs_iocore_t *io,
62 xfs_off_t offset,
63 ssize_t count)
64 {
65 xfs_inode_t *ip = XFS_IO_INODE(io);
66
67 if (!ip->i_rwtrace)
68 return;
69
70 ktrace_enter(ip->i_rwtrace,
71 (void *)((unsigned long)tag),
72 (void *)ip,
73 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
74 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
75 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
76 (void *)((unsigned long)(offset & 0xffffffff)),
77 (void *)((unsigned long)count),
78 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)),
79 (void *)((unsigned long)(io->io_new_size & 0xffffffff)),
80 (void *)NULL,
81 (void *)NULL,
82 (void *)NULL,
83 (void *)NULL,
84 (void *)NULL,
85 (void *)NULL,
86 (void *)NULL);
87 }
88
89 void
90 xfs_iomap_map_trace(
91 int tag,
92 xfs_iocore_t *io,
93 xfs_off_t offset,
94 ssize_t count,
95 xfs_iomap_t *iomapp,
96 xfs_bmbt_irec_t *imapp,
97 int flags)
98 {
99 xfs_inode_t *ip = XFS_IO_INODE(io);
100
101 if (!ip->i_rwtrace)
102 return;
103
104 ktrace_enter(ip->i_rwtrace,
105 (void *)((unsigned long)tag),
106 (void *)ip,
107 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
108 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
109 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
110 (void *)((unsigned long)(offset & 0xffffffff)),
111 (void *)((unsigned long)count),
112 (void *)((unsigned long)flags),
113 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),
114 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),
115 (void *)((unsigned long)(iomapp->iomap_delta)),
116 (void *)((unsigned long)(iomapp->iomap_bsize)),
117 (void *)((unsigned long)(iomapp->iomap_bn)),
118 (void *)(__psint_t)(imapp->br_startoff),
119 (void *)((unsigned long)(imapp->br_blockcount)),
120 (void *)(__psint_t)(imapp->br_startblock));
121 }
122 #else
123 #define xfs_iomap_enter_trace(tag, io, offset, count)
124 #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)
125 #endif
126
127 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
128 << mp->m_writeio_log)
129 #define XFS_STRAT_WRITE_IMAPS 2
130 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
131
132 STATIC int
133 xfs_imap_to_bmap(
134 xfs_iocore_t *io,
135 xfs_off_t offset,
136 xfs_bmbt_irec_t *imap,
137 xfs_iomap_t *iomapp,
138 int imaps, /* Number of imap entries */
139 int iomaps, /* Number of iomap entries */
140 int flags)
141 {
142 xfs_mount_t *mp;
143 xfs_fsize_t nisize;
144 int pbm;
145 xfs_fsblock_t start_block;
146
147 mp = io->io_mount;
148 nisize = XFS_SIZE(mp, io);
149 if (io->io_new_size > nisize)
150 nisize = io->io_new_size;
151
152 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {
153 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);
154 iomapp->iomap_delta = offset - iomapp->iomap_offset;
155 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
156 iomapp->iomap_flags = flags;
157
158 if (io->io_flags & XFS_IOCORE_RT) {
159 iomapp->iomap_flags |= IOMAP_REALTIME;
160 iomapp->iomap_target = mp->m_rtdev_targp;
161 } else {
162 iomapp->iomap_target = mp->m_ddev_targp;
163 }
164 start_block = imap->br_startblock;
165 if (start_block == HOLESTARTBLOCK) {
166 iomapp->iomap_bn = IOMAP_DADDR_NULL;
167 iomapp->iomap_flags |= IOMAP_HOLE;
168 } else if (start_block == DELAYSTARTBLOCK) {
169 iomapp->iomap_bn = IOMAP_DADDR_NULL;
170 iomapp->iomap_flags |= IOMAP_DELAY;
171 } else {
172 iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block);
173 if (ISUNWRITTEN(imap))
174 iomapp->iomap_flags |= IOMAP_UNWRITTEN;
175 }
176
177 if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) {
178 iomapp->iomap_flags |= IOMAP_EOF;
179 }
180
181 offset += iomapp->iomap_bsize - iomapp->iomap_delta;
182 }
183 return pbm; /* Return the number filled */
184 }
185
186 int
187 xfs_iomap(
188 xfs_iocore_t *io,
189 xfs_off_t offset,
190 ssize_t count,
191 int flags,
192 xfs_iomap_t *iomapp,
193 int *niomaps)
194 {
195 xfs_mount_t *mp = io->io_mount;
196 xfs_fileoff_t offset_fsb, end_fsb;
197 int error = 0;
198 int lockmode = 0;
199 xfs_bmbt_irec_t imap;
200 int nimaps = 1;
201 int bmapi_flags = 0;
202 int iomap_flags = 0;
203
204 if (XFS_FORCED_SHUTDOWN(mp))
205 return XFS_ERROR(EIO);
206
207 switch (flags &
208 (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE |
209 BMAPI_UNWRITTEN | BMAPI_DEVICE)) {
210 case BMAPI_READ:
211 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count);
212 lockmode = XFS_LCK_MAP_SHARED(mp, io);
213 bmapi_flags = XFS_BMAPI_ENTIRE;
214 break;
215 case BMAPI_WRITE:
216 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);
217 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;
218 if (flags & BMAPI_IGNSTATE)
219 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE;
220 XFS_ILOCK(mp, io, lockmode);
221 break;
222 case BMAPI_ALLOCATE:
223 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count);
224 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD;
225 bmapi_flags = XFS_BMAPI_ENTIRE;
226 /* Attempt non-blocking lock */
227 if (flags & BMAPI_TRYLOCK) {
228 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode))
229 return XFS_ERROR(EAGAIN);
230 } else {
231 XFS_ILOCK(mp, io, lockmode);
232 }
233 break;
234 case BMAPI_UNWRITTEN:
235 goto phase2;
236 case BMAPI_DEVICE:
237 lockmode = XFS_LCK_MAP_SHARED(mp, io);
238 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ?
239 mp->m_rtdev_targp : mp->m_ddev_targp;
240 error = 0;
241 *niomaps = 1;
242 goto out;
243 default:
244 BUG();
245 }
246
247 ASSERT(offset <= mp->m_maxioffset);
248 if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
249 count = mp->m_maxioffset - offset;
250 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
251 offset_fsb = XFS_B_TO_FSBT(mp, offset);
252
253 error = XFS_BMAPI(mp, NULL, io, offset_fsb,
254 (xfs_filblks_t)(end_fsb - offset_fsb),
255 bmapi_flags, NULL, 0, &imap,
256 &nimaps, NULL);
257
258 if (error)
259 goto out;
260
261 phase2:
262 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) {
263 case BMAPI_WRITE:
264 /* If we found an extent, return it */
265 if (nimaps &&
266 (imap.br_startblock != HOLESTARTBLOCK) &&
267 (imap.br_startblock != DELAYSTARTBLOCK)) {
268 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
269 offset, count, iomapp, &imap, flags);
270 break;
271 }
272
273 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
274 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,
275 count, flags, &imap, &nimaps, nimaps);
276 } else {
277 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,
278 flags, &imap, &nimaps);
279 }
280 if (!error) {
281 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,
282 offset, count, iomapp, &imap, flags);
283 }
284 iomap_flags = IOMAP_NEW;
285 break;
286 case BMAPI_ALLOCATE:
287 /* If we found an extent, return it */
288 XFS_IUNLOCK(mp, io, lockmode);
289 lockmode = 0;
290
291 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
292 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
293 offset, count, iomapp, &imap, flags);
294 break;
295 }
296
297 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count,
298 &imap, &nimaps);
299 break;
300 case BMAPI_UNWRITTEN:
301 lockmode = 0;
302 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
303 nimaps = 0;
304 break;
305 }
306
307 if (nimaps) {
308 *niomaps = xfs_imap_to_bmap(io, offset, &imap,
309 iomapp, nimaps, *niomaps, iomap_flags);
310 } else if (niomaps) {
311 *niomaps = 0;
312 }
313
314 out:
315 if (lockmode)
316 XFS_IUNLOCK(mp, io, lockmode);
317 return XFS_ERROR(error);
318 }
319
320 STATIC int
321 xfs_flush_space(
322 xfs_inode_t *ip,
323 int *fsynced,
324 int *ioflags)
325 {
326 switch (*fsynced) {
327 case 0:
328 if (ip->i_delayed_blks) {
329 xfs_iunlock(ip, XFS_ILOCK_EXCL);
330 xfs_flush_inode(ip);
331 xfs_ilock(ip, XFS_ILOCK_EXCL);
332 *fsynced = 1;
333 } else {
334 *ioflags |= BMAPI_SYNC;
335 *fsynced = 2;
336 }
337 return 0;
338 case 1:
339 *fsynced = 2;
340 *ioflags |= BMAPI_SYNC;
341 return 0;
342 case 2:
343 xfs_iunlock(ip, XFS_ILOCK_EXCL);
344 xfs_flush_device(ip);
345 xfs_ilock(ip, XFS_ILOCK_EXCL);
346 *fsynced = 3;
347 return 0;
348 }
349 return 1;
350 }
351
352 int
353 xfs_iomap_write_direct(
354 xfs_inode_t *ip,
355 xfs_off_t offset,
356 size_t count,
357 int flags,
358 xfs_bmbt_irec_t *ret_imap,
359 int *nmaps,
360 int found)
361 {
362 xfs_mount_t *mp = ip->i_mount;
363 xfs_iocore_t *io = &ip->i_iocore;
364 xfs_fileoff_t offset_fsb;
365 xfs_fileoff_t last_fsb;
366 xfs_filblks_t count_fsb;
367 xfs_fsblock_t firstfsb;
368 int nimaps;
369 int error;
370 int bmapi_flag;
371 int quota_flag;
372 int rt;
373 xfs_trans_t *tp;
374 xfs_bmbt_irec_t imap;
375 xfs_bmap_free_t free_list;
376 xfs_filblks_t qblocks, resblks;
377 int committed;
378 int resrtextents;
379
380 /*
381 * Make sure that the dquots are there. This doesn't hold
382 * the ilock across a disk read.
383 */
384 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
385 if (error)
386 return XFS_ERROR(error);
387
388 offset_fsb = XFS_B_TO_FSBT(mp, offset);
389 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
390 count_fsb = last_fsb - offset_fsb;
391 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {
392 xfs_fileoff_t map_last_fsb;
393
394 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;
395 if (map_last_fsb < last_fsb) {
396 last_fsb = map_last_fsb;
397 count_fsb = last_fsb - offset_fsb;
398 }
399 ASSERT(count_fsb > 0);
400 }
401
402 /*
403 * Determine if reserving space on the data or realtime partition.
404 */
405 if ((rt = XFS_IS_REALTIME_INODE(ip))) {
406 xfs_extlen_t extsz;
407
408 if (!(extsz = ip->i_d.di_extsize))
409 extsz = mp->m_sb.sb_rextsize;
410 resrtextents = qblocks = (count_fsb + extsz - 1);
411 do_div(resrtextents, mp->m_sb.sb_rextsize);
412 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
413 quota_flag = XFS_QMOPT_RES_RTBLKS;
414 } else {
415 resrtextents = 0;
416 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, count_fsb);
417 quota_flag = XFS_QMOPT_RES_REGBLKS;
418 }
419
420 /*
421 * Allocate and setup the transaction
422 */
423 xfs_iunlock(ip, XFS_ILOCK_EXCL);
424 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
425 error = xfs_trans_reserve(tp, resblks,
426 XFS_WRITE_LOG_RES(mp), resrtextents,
427 XFS_TRANS_PERM_LOG_RES,
428 XFS_WRITE_LOG_COUNT);
429
430 /*
431 * Check for running out of space, note: need lock to return
432 */
433 if (error)
434 xfs_trans_cancel(tp, 0);
435 xfs_ilock(ip, XFS_ILOCK_EXCL);
436 if (error)
437 goto error_out;
438
439 if (XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag)) {
440 error = (EDQUOT);
441 goto error1;
442 }
443
444 bmapi_flag = XFS_BMAPI_WRITE;
445 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
446 xfs_trans_ihold(tp, ip);
447
448 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))
449 bmapi_flag |= XFS_BMAPI_PREALLOC;
450
451 /*
452 * Issue the bmapi() call to allocate the blocks
453 */
454 XFS_BMAP_INIT(&free_list, &firstfsb);
455 nimaps = 1;
456 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
457 bmapi_flag, &firstfsb, 0, &imap, &nimaps, &free_list);
458 if (error)
459 goto error0;
460
461 /*
462 * Complete the transaction
463 */
464 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
465 if (error)
466 goto error0;
467 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
468 if (error)
469 goto error_out;
470
471 /*
472 * Copy any maps to caller's array and return any error.
473 */
474 if (nimaps == 0) {
475 error = (ENOSPC);
476 goto error_out;
477 }
478
479 *ret_imap = imap;
480 *nmaps = 1;
481 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
482 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
483 "start_block : %llx start_off : %llx blkcnt : %llx "
484 "extent-state : %x \n",
485 (ip->i_mount)->m_fsname,
486 (long long)ip->i_ino,
487 ret_imap->br_startblock, ret_imap->br_startoff,
488 ret_imap->br_blockcount,ret_imap->br_state);
489 }
490 return 0;
491
492 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
493 xfs_bmap_cancel(&free_list);
494 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
495
496 error1: /* Just cancel transaction */
497 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
498 *nmaps = 0; /* nothing set-up here */
499
500 error_out:
501 return XFS_ERROR(error);
502 }
503
504 int
505 xfs_iomap_write_delay(
506 xfs_inode_t *ip,
507 xfs_off_t offset,
508 size_t count,
509 int ioflag,
510 xfs_bmbt_irec_t *ret_imap,
511 int *nmaps)
512 {
513 xfs_mount_t *mp = ip->i_mount;
514 xfs_iocore_t *io = &ip->i_iocore;
515 xfs_fileoff_t offset_fsb;
516 xfs_fileoff_t last_fsb;
517 xfs_fsize_t isize;
518 xfs_fsblock_t firstblock;
519 int nimaps;
520 int error;
521 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
522 int aeof;
523 int fsynced = 0;
524
525 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
526
527 /*
528 * Make sure that the dquots are there. This doesn't hold
529 * the ilock across a disk read.
530 */
531
532 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
533 if (error)
534 return XFS_ERROR(error);
535
536 retry:
537 isize = ip->i_d.di_size;
538 if (io->io_new_size > isize) {
539 isize = io->io_new_size;
540 }
541
542 aeof = 0;
543 offset_fsb = XFS_B_TO_FSBT(mp, offset);
544 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
545 /*
546 * If the caller is doing a write at the end of the file,
547 * then extend the allocation (and the buffer used for the write)
548 * out to the file system's write iosize. We clean up any extra
549 * space left over when the file is closed in xfs_inactive().
550 *
551 * For sync writes, we are flushing delayed allocate space to
552 * try to make additional space available for allocation near
553 * the filesystem full boundary - preallocation hurts in that
554 * situation, of course.
555 */
556 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
557 xfs_off_t aligned_offset;
558 xfs_filblks_t count_fsb;
559 unsigned int iosize;
560 xfs_fileoff_t ioalign;
561 int n;
562 xfs_fileoff_t start_fsb;
563
564 /*
565 * If there are any real blocks past eof, then don't
566 * do any speculative allocation.
567 */
568 start_fsb = XFS_B_TO_FSBT(mp,
569 ((xfs_ufsize_t)(offset + count - 1)));
570 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
571 while (count_fsb > 0) {
572 nimaps = XFS_WRITE_IMAPS;
573 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
574 0, &firstblock, 0, imap, &nimaps, NULL);
575 if (error) {
576 return error;
577 }
578 for (n = 0; n < nimaps; n++) {
579 if ( !(io->io_flags & XFS_IOCORE_RT) &&
580 !imap[n].br_startblock) {
581 cmn_err(CE_PANIC,"Access to block "
582 "zero: fs <%s> inode: %lld "
583 "start_block : %llx start_off "
584 ": %llx blkcnt : %llx "
585 "extent-state : %x \n",
586 (ip->i_mount)->m_fsname,
587 (long long)ip->i_ino,
588 imap[n].br_startblock,
589 imap[n].br_startoff,
590 imap[n].br_blockcount,
591 imap[n].br_state);
592 }
593 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
594 (imap[n].br_startblock != DELAYSTARTBLOCK)) {
595 goto write_map;
596 }
597 start_fsb += imap[n].br_blockcount;
598 count_fsb -= imap[n].br_blockcount;
599 }
600 }
601 iosize = mp->m_writeio_blocks;
602 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
603 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
604 last_fsb = ioalign + iosize;
605 aeof = 1;
606 }
607 write_map:
608 nimaps = XFS_WRITE_IMAPS;
609 firstblock = NULLFSBLOCK;
610
611 /*
612 * If mounted with the "-o swalloc" option, roundup the allocation
613 * request to a stripe width boundary if the file size is >=
614 * stripe width and we are allocating past the allocation eof.
615 */
616 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth
617 && (mp->m_flags & XFS_MOUNT_SWALLOC)
618 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
619 int eof;
620 xfs_fileoff_t new_last_fsb;
621
622 new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
623 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
624 if (error) {
625 return error;
626 }
627 if (eof) {
628 last_fsb = new_last_fsb;
629 }
630 /*
631 * Roundup the allocation request to a stripe unit (m_dalign) boundary
632 * if the file size is >= stripe unit size, and we are allocating past
633 * the allocation eof.
634 */
635 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
636 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
637 int eof;
638 xfs_fileoff_t new_last_fsb;
639 new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
640 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
641 if (error) {
642 return error;
643 }
644 if (eof) {
645 last_fsb = new_last_fsb;
646 }
647 /*
648 * Round up the allocation request to a real-time extent boundary
649 * if the file is on the real-time subvolume.
650 */
651 } else if (io->io_flags & XFS_IOCORE_RT && aeof) {
652 int eof;
653 xfs_fileoff_t new_last_fsb;
654
655 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
656 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
657 if (error) {
658 return error;
659 }
660 if (eof)
661 last_fsb = new_last_fsb;
662 }
663 error = xfs_bmapi(NULL, ip, offset_fsb,
664 (xfs_filblks_t)(last_fsb - offset_fsb),
665 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
666 XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
667 &nimaps, NULL);
668 /*
669 * This can be EDQUOT, if nimaps == 0
670 */
671 if (error && (error != ENOSPC)) {
672 return XFS_ERROR(error);
673 }
674 /*
675 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
676 * then we must have run out of space.
677 */
678 if (nimaps == 0) {
679 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
680 io, offset, count);
681 if (xfs_flush_space(ip, &fsynced, &ioflag))
682 return XFS_ERROR(ENOSPC);
683
684 error = 0;
685 goto retry;
686 }
687
688 *ret_imap = imap[0];
689 *nmaps = 1;
690 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
691 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
692 "start_block : %llx start_off : %llx blkcnt : %llx "
693 "extent-state : %x \n",
694 (ip->i_mount)->m_fsname,
695 (long long)ip->i_ino,
696 ret_imap->br_startblock, ret_imap->br_startoff,
697 ret_imap->br_blockcount,ret_imap->br_state);
698 }
699 return 0;
700 }
701
702 /*
703 * Pass in a delayed allocate extent, convert it to real extents;
704 * return to the caller the extent we create which maps on top of
705 * the originating callers request.
706 *
707 * Called without a lock on the inode.
708 */
709 int
710 xfs_iomap_write_allocate(
711 xfs_inode_t *ip,
712 xfs_off_t offset,
713 size_t count,
714 xfs_bmbt_irec_t *map,
715 int *retmap)
716 {
717 xfs_mount_t *mp = ip->i_mount;
718 xfs_iocore_t *io = &ip->i_iocore;
719 xfs_fileoff_t offset_fsb, last_block;
720 xfs_fileoff_t end_fsb, map_start_fsb;
721 xfs_fsblock_t first_block;
722 xfs_bmap_free_t free_list;
723 xfs_filblks_t count_fsb;
724 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
725 xfs_trans_t *tp;
726 int i, nimaps, committed;
727 int error = 0;
728 int nres;
729
730 *retmap = 0;
731
732 /*
733 * Make sure that the dquots are there.
734 */
735 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
736 return XFS_ERROR(error);
737
738 offset_fsb = XFS_B_TO_FSBT(mp, offset);
739 count_fsb = map->br_blockcount;
740 map_start_fsb = map->br_startoff;
741
742 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
743
744 while (count_fsb != 0) {
745 /*
746 * Set up a transaction with which to allocate the
747 * backing store for the file. Do allocations in a
748 * loop until we get some space in the range we are
749 * interested in. The other space that might be allocated
750 * is in the delayed allocation extent on which we sit
751 * but before our buffer starts.
752 */
753
754 nimaps = 0;
755 while (nimaps == 0) {
756 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
757 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
758 error = xfs_trans_reserve(tp, nres,
759 XFS_WRITE_LOG_RES(mp),
760 0, XFS_TRANS_PERM_LOG_RES,
761 XFS_WRITE_LOG_COUNT);
762 if (error == ENOSPC) {
763 error = xfs_trans_reserve(tp, 0,
764 XFS_WRITE_LOG_RES(mp),
765 0,
766 XFS_TRANS_PERM_LOG_RES,
767 XFS_WRITE_LOG_COUNT);
768 }
769 if (error) {
770 xfs_trans_cancel(tp, 0);
771 return XFS_ERROR(error);
772 }
773 xfs_ilock(ip, XFS_ILOCK_EXCL);
774 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
775 xfs_trans_ihold(tp, ip);
776
777 XFS_BMAP_INIT(&free_list, &first_block);
778
779 nimaps = XFS_STRAT_WRITE_IMAPS;
780 /*
781 * Ensure we don't go beyond eof - it is possible
782 * the extents changed since we did the read call,
783 * we dropped the ilock in the interim.
784 */
785
786 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size);
787 xfs_bmap_last_offset(NULL, ip, &last_block,
788 XFS_DATA_FORK);
789 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
790 if ((map_start_fsb + count_fsb) > last_block) {
791 count_fsb = last_block - map_start_fsb;
792 if (count_fsb == 0) {
793 error = EAGAIN;
794 goto trans_cancel;
795 }
796 }
797
798 /* Go get the actual blocks */
799 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
800 XFS_BMAPI_WRITE, &first_block, 1,
801 imap, &nimaps, &free_list);
802 if (error)
803 goto trans_cancel;
804
805 error = xfs_bmap_finish(&tp, &free_list,
806 first_block, &committed);
807 if (error)
808 goto trans_cancel;
809
810 error = xfs_trans_commit(tp,
811 XFS_TRANS_RELEASE_LOG_RES, NULL);
812 if (error)
813 goto error0;
814
815 xfs_iunlock(ip, XFS_ILOCK_EXCL);
816 }
817
818 /*
819 * See if we were able to allocate an extent that
820 * covers at least part of the callers request
821 */
822
823 for (i = 0; i < nimaps; i++) {
824 if ( !(io->io_flags & XFS_IOCORE_RT) &&
825 !imap[i].br_startblock) {
826 cmn_err(CE_PANIC,"Access to block zero: "
827 "fs <%s> inode: %lld "
828 "start_block : %llx start_off : %llx "
829 "blkcnt : %llx extent-state : %x \n",
830 (ip->i_mount)->m_fsname,
831 (long long)ip->i_ino,
832 imap[i].br_startblock,
833 imap[i].br_startoff,
834 imap[i].br_blockcount,imap[i].br_state);
835 }
836 if ((offset_fsb >= imap[i].br_startoff) &&
837 (offset_fsb < (imap[i].br_startoff +
838 imap[i].br_blockcount))) {
839 *map = imap[i];
840 *retmap = 1;
841 XFS_STATS_INC(xs_xstrat_quick);
842 return 0;
843 }
844 count_fsb -= imap[i].br_blockcount;
845 }
846
847 /* So far we have not mapped the requested part of the
848 * file, just surrounding data, try again.
849 */
850 nimaps--;
851 map_start_fsb = imap[nimaps].br_startoff +
852 imap[nimaps].br_blockcount;
853 }
854
855 trans_cancel:
856 xfs_bmap_cancel(&free_list);
857 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
858 error0:
859 xfs_iunlock(ip, XFS_ILOCK_EXCL);
860 return XFS_ERROR(error);
861 }
862
863 int
864 xfs_iomap_write_unwritten(
865 xfs_inode_t *ip,
866 xfs_off_t offset,
867 size_t count)
868 {
869 xfs_mount_t *mp = ip->i_mount;
870 xfs_iocore_t *io = &ip->i_iocore;
871 xfs_trans_t *tp;
872 xfs_fileoff_t offset_fsb;
873 xfs_filblks_t count_fsb;
874 xfs_filblks_t numblks_fsb;
875 xfs_bmbt_irec_t imap;
876 int committed;
877 int error;
878 int nres;
879 int nimaps;
880 xfs_fsblock_t firstfsb;
881 xfs_bmap_free_t free_list;
882
883 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
884 &ip->i_iocore, offset, count);
885
886 offset_fsb = XFS_B_TO_FSBT(mp, offset);
887 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
888 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
889
890 do {
891 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
892
893 /*
894 * set up a transaction to convert the range of extents
895 * from unwritten to real. Do allocations in a loop until
896 * we have covered the range passed in.
897 */
898
899 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
900 error = xfs_trans_reserve(tp, nres,
901 XFS_WRITE_LOG_RES(mp), 0,
902 XFS_TRANS_PERM_LOG_RES,
903 XFS_WRITE_LOG_COUNT);
904 if (error) {
905 xfs_trans_cancel(tp, 0);
906 goto error0;
907 }
908
909 xfs_ilock(ip, XFS_ILOCK_EXCL);
910 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
911 xfs_trans_ihold(tp, ip);
912
913 /*
914 * Modify the unwritten extent state of the buffer.
915 */
916 XFS_BMAP_INIT(&free_list, &firstfsb);
917 nimaps = 1;
918 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
919 XFS_BMAPI_WRITE, &firstfsb,
920 1, &imap, &nimaps, &free_list);
921 if (error)
922 goto error_on_bmapi_transaction;
923
924 error = xfs_bmap_finish(&(tp), &(free_list),
925 firstfsb, &committed);
926 if (error)
927 goto error_on_bmapi_transaction;
928
929 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
930 xfs_iunlock(ip, XFS_ILOCK_EXCL);
931 if (error)
932 goto error0;
933
934 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) {
935 cmn_err(CE_PANIC,"Access to block zero: fs <%s> "
936 "inode: %lld start_block : %llx start_off : "
937 "%llx blkcnt : %llx extent-state : %x \n",
938 (ip->i_mount)->m_fsname,
939 (long long)ip->i_ino,
940 imap.br_startblock,imap.br_startoff,
941 imap.br_blockcount,imap.br_state);
942 }
943
944 if ((numblks_fsb = imap.br_blockcount) == 0) {
945 /*
946 * The numblks_fsb value should always get
947 * smaller, otherwise the loop is stuck.
948 */
949 ASSERT(imap.br_blockcount);
950 break;
951 }
952 offset_fsb += numblks_fsb;
953 count_fsb -= numblks_fsb;
954 } while (count_fsb > 0);
955
956 return 0;
957
958 error_on_bmapi_transaction:
959 xfs_bmap_cancel(&free_list);
960 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
961 xfs_iunlock(ip, XFS_ILOCK_EXCL);
962 error0:
963 return XFS_ERROR(error);
964 }
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