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1 /*
2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32
33 #include "xfs.h"
34
35 #include "xfs_fs.h"
36 #include "xfs_inum.h"
37 #include "xfs_log.h"
38 #include "xfs_trans.h"
39 #include "xfs_sb.h"
40 #include "xfs_ag.h"
41 #include "xfs_dir.h"
42 #include "xfs_dir2.h"
43 #include "xfs_alloc.h"
44 #include "xfs_dmapi.h"
45 #include "xfs_quota.h"
46 #include "xfs_mount.h"
47 #include "xfs_alloc_btree.h"
48 #include "xfs_bmap_btree.h"
49 #include "xfs_ialloc_btree.h"
50 #include "xfs_btree.h"
51 #include "xfs_ialloc.h"
52 #include "xfs_attr_sf.h"
53 #include "xfs_dir_sf.h"
54 #include "xfs_dir2_sf.h"
55 #include "xfs_dinode.h"
56 #include "xfs_inode.h"
57 #include "xfs_bmap.h"
58 #include "xfs_bit.h"
59 #include "xfs_rtalloc.h"
60 #include "xfs_error.h"
61 #include "xfs_itable.h"
62 #include "xfs_rw.h"
63 #include "xfs_acl.h"
64 #include "xfs_cap.h"
65 #include "xfs_mac.h"
66 #include "xfs_attr.h"
67 #include "xfs_buf_item.h"
68 #include "xfs_trans_space.h"
69 #include "xfs_utils.h"
70 #include "xfs_iomap.h"
71
72 #if defined(XFS_RW_TRACE)
73 void
74 xfs_iomap_enter_trace(
75 int tag,
76 xfs_iocore_t *io,
77 xfs_off_t offset,
78 ssize_t count)
79 {
80 xfs_inode_t *ip = XFS_IO_INODE(io);
81
82 if (!ip->i_rwtrace)
83 return;
84
85 ktrace_enter(ip->i_rwtrace,
86 (void *)((unsigned long)tag),
87 (void *)ip,
88 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
89 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
90 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
91 (void *)((unsigned long)(offset & 0xffffffff)),
92 (void *)((unsigned long)count),
93 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)),
94 (void *)((unsigned long)(io->io_new_size & 0xffffffff)),
95 (void *)NULL,
96 (void *)NULL,
97 (void *)NULL,
98 (void *)NULL,
99 (void *)NULL,
100 (void *)NULL,
101 (void *)NULL);
102 }
103
104 void
105 xfs_iomap_map_trace(
106 int tag,
107 xfs_iocore_t *io,
108 xfs_off_t offset,
109 ssize_t count,
110 xfs_iomap_t *iomapp,
111 xfs_bmbt_irec_t *imapp,
112 int flags)
113 {
114 xfs_inode_t *ip = XFS_IO_INODE(io);
115
116 if (!ip->i_rwtrace)
117 return;
118
119 ktrace_enter(ip->i_rwtrace,
120 (void *)((unsigned long)tag),
121 (void *)ip,
122 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
123 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
124 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
125 (void *)((unsigned long)(offset & 0xffffffff)),
126 (void *)((unsigned long)count),
127 (void *)((unsigned long)flags),
128 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),
129 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),
130 (void *)((unsigned long)(iomapp->iomap_delta)),
131 (void *)((unsigned long)(iomapp->iomap_bsize)),
132 (void *)((unsigned long)(iomapp->iomap_bn)),
133 (void *)(__psint_t)(imapp->br_startoff),
134 (void *)((unsigned long)(imapp->br_blockcount)),
135 (void *)(__psint_t)(imapp->br_startblock));
136 }
137 #else
138 #define xfs_iomap_enter_trace(tag, io, offset, count)
139 #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)
140 #endif
141
142 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
143 << mp->m_writeio_log)
144 #define XFS_STRAT_WRITE_IMAPS 2
145 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
146
147 STATIC int
148 xfs_imap_to_bmap(
149 xfs_iocore_t *io,
150 xfs_off_t offset,
151 xfs_bmbt_irec_t *imap,
152 xfs_iomap_t *iomapp,
153 int imaps, /* Number of imap entries */
154 int iomaps, /* Number of iomap entries */
155 int flags)
156 {
157 xfs_mount_t *mp;
158 xfs_fsize_t nisize;
159 int pbm;
160 xfs_fsblock_t start_block;
161
162 mp = io->io_mount;
163 nisize = XFS_SIZE(mp, io);
164 if (io->io_new_size > nisize)
165 nisize = io->io_new_size;
166
167 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {
168 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);
169 iomapp->iomap_delta = offset - iomapp->iomap_offset;
170 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
171 iomapp->iomap_flags = flags;
172
173 if (io->io_flags & XFS_IOCORE_RT) {
174 iomapp->iomap_flags |= IOMAP_REALTIME;
175 iomapp->iomap_target = mp->m_rtdev_targp;
176 } else {
177 iomapp->iomap_target = mp->m_ddev_targp;
178 }
179 start_block = imap->br_startblock;
180 if (start_block == HOLESTARTBLOCK) {
181 iomapp->iomap_bn = IOMAP_DADDR_NULL;
182 iomapp->iomap_flags |= IOMAP_HOLE;
183 } else if (start_block == DELAYSTARTBLOCK) {
184 iomapp->iomap_bn = IOMAP_DADDR_NULL;
185 iomapp->iomap_flags |= IOMAP_DELAY;
186 } else {
187 iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block);
188 if (ISUNWRITTEN(imap))
189 iomapp->iomap_flags |= IOMAP_UNWRITTEN;
190 }
191
192 if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) {
193 iomapp->iomap_flags |= IOMAP_EOF;
194 }
195
196 offset += iomapp->iomap_bsize - iomapp->iomap_delta;
197 }
198 return pbm; /* Return the number filled */
199 }
200
201 int
202 xfs_iomap(
203 xfs_iocore_t *io,
204 xfs_off_t offset,
205 ssize_t count,
206 int flags,
207 xfs_iomap_t *iomapp,
208 int *niomaps)
209 {
210 xfs_mount_t *mp = io->io_mount;
211 xfs_fileoff_t offset_fsb, end_fsb;
212 int error = 0;
213 int lockmode = 0;
214 xfs_bmbt_irec_t imap;
215 int nimaps = 1;
216 int bmapi_flags = 0;
217 int iomap_flags = 0;
218
219 if (XFS_FORCED_SHUTDOWN(mp))
220 return XFS_ERROR(EIO);
221
222 switch (flags &
223 (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE |
224 BMAPI_UNWRITTEN | BMAPI_DEVICE)) {
225 case BMAPI_READ:
226 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count);
227 lockmode = XFS_LCK_MAP_SHARED(mp, io);
228 bmapi_flags = XFS_BMAPI_ENTIRE;
229 if (flags & BMAPI_IGNSTATE)
230 bmapi_flags |= XFS_BMAPI_IGSTATE;
231 break;
232 case BMAPI_WRITE:
233 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);
234 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;
235 bmapi_flags = 0;
236 XFS_ILOCK(mp, io, lockmode);
237 break;
238 case BMAPI_ALLOCATE:
239 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count);
240 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD;
241 bmapi_flags = XFS_BMAPI_ENTIRE;
242 /* Attempt non-blocking lock */
243 if (flags & BMAPI_TRYLOCK) {
244 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode))
245 return XFS_ERROR(EAGAIN);
246 } else {
247 XFS_ILOCK(mp, io, lockmode);
248 }
249 break;
250 case BMAPI_UNWRITTEN:
251 goto phase2;
252 case BMAPI_DEVICE:
253 lockmode = XFS_LCK_MAP_SHARED(mp, io);
254 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ?
255 mp->m_rtdev_targp : mp->m_ddev_targp;
256 error = 0;
257 *niomaps = 1;
258 goto out;
259 default:
260 BUG();
261 }
262
263 ASSERT(offset <= mp->m_maxioffset);
264 if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
265 count = mp->m_maxioffset - offset;
266 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
267 offset_fsb = XFS_B_TO_FSBT(mp, offset);
268
269 error = XFS_BMAPI(mp, NULL, io, offset_fsb,
270 (xfs_filblks_t)(end_fsb - offset_fsb),
271 bmapi_flags, NULL, 0, &imap,
272 &nimaps, NULL);
273
274 if (error)
275 goto out;
276
277 phase2:
278 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) {
279 case BMAPI_WRITE:
280 /* If we found an extent, return it */
281 if (nimaps && (imap.br_startblock != HOLESTARTBLOCK)) {
282 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
283 offset, count, iomapp, &imap, flags);
284 break;
285 }
286
287 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
288 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,
289 count, flags, &imap, &nimaps, nimaps);
290 } else {
291 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,
292 flags, &imap, &nimaps);
293 }
294 if (!error) {
295 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,
296 offset, count, iomapp, &imap, flags);
297 }
298 iomap_flags = IOMAP_NEW;
299 break;
300 case BMAPI_ALLOCATE:
301 /* If we found an extent, return it */
302 XFS_IUNLOCK(mp, io, lockmode);
303 lockmode = 0;
304
305 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
306 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
307 offset, count, iomapp, &imap, flags);
308 break;
309 }
310
311 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, &imap, &nimaps);
312 break;
313 case BMAPI_UNWRITTEN:
314 lockmode = 0;
315 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
316 nimaps = 0;
317 break;
318 }
319
320 if (nimaps) {
321 *niomaps = xfs_imap_to_bmap(io, offset, &imap,
322 iomapp, nimaps, *niomaps, iomap_flags);
323 } else if (niomaps) {
324 *niomaps = 0;
325 }
326
327 out:
328 if (lockmode)
329 XFS_IUNLOCK(mp, io, lockmode);
330 return XFS_ERROR(error);
331 }
332
333 STATIC int
334 xfs_flush_space(
335 xfs_inode_t *ip,
336 int *fsynced,
337 int *ioflags)
338 {
339 switch (*fsynced) {
340 case 0:
341 if (ip->i_delayed_blks) {
342 xfs_iunlock(ip, XFS_ILOCK_EXCL);
343 xfs_flush_inode(ip);
344 xfs_ilock(ip, XFS_ILOCK_EXCL);
345 *fsynced = 1;
346 } else {
347 *ioflags |= BMAPI_SYNC;
348 *fsynced = 2;
349 }
350 return 0;
351 case 1:
352 *fsynced = 2;
353 *ioflags |= BMAPI_SYNC;
354 return 0;
355 case 2:
356 xfs_iunlock(ip, XFS_ILOCK_EXCL);
357 xfs_flush_device(ip);
358 xfs_ilock(ip, XFS_ILOCK_EXCL);
359 *fsynced = 3;
360 return 0;
361 }
362 return 1;
363 }
364
365 int
366 xfs_iomap_write_direct(
367 xfs_inode_t *ip,
368 loff_t offset,
369 size_t count,
370 int flags,
371 xfs_bmbt_irec_t *ret_imap,
372 int *nmaps,
373 int found)
374 {
375 xfs_mount_t *mp = ip->i_mount;
376 xfs_iocore_t *io = &ip->i_iocore;
377 xfs_fileoff_t offset_fsb;
378 xfs_fileoff_t last_fsb;
379 xfs_filblks_t count_fsb;
380 xfs_fsize_t isize;
381 xfs_fsblock_t firstfsb;
382 int nimaps, maps;
383 int error;
384 int bmapi_flag;
385 int rt;
386 xfs_trans_t *tp;
387 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp;
388 xfs_bmap_free_t free_list;
389 int aeof;
390 xfs_filblks_t datablocks;
391 int committed;
392 int numrtextents;
393 uint resblks;
394
395 /*
396 * Make sure that the dquots are there. This doesn't hold
397 * the ilock across a disk read.
398 */
399 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
400 if (error)
401 return XFS_ERROR(error);
402
403 maps = min(XFS_WRITE_IMAPS, *nmaps);
404 nimaps = maps;
405
406 isize = ip->i_d.di_size;
407 aeof = (offset + count) > isize;
408
409 if (io->io_new_size > isize)
410 isize = io->io_new_size;
411
412 offset_fsb = XFS_B_TO_FSBT(mp, offset);
413 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
414 count_fsb = last_fsb - offset_fsb;
415 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {
416 xfs_fileoff_t map_last_fsb;
417
418 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;
419
420 if (map_last_fsb < last_fsb) {
421 last_fsb = map_last_fsb;
422 count_fsb = last_fsb - offset_fsb;
423 }
424 ASSERT(count_fsb > 0);
425 }
426
427 /*
428 * determine if reserving space on
429 * the data or realtime partition.
430 */
431 if ((rt = XFS_IS_REALTIME_INODE(ip))) {
432 int sbrtextsize, iprtextsize;
433
434 sbrtextsize = mp->m_sb.sb_rextsize;
435 iprtextsize =
436 ip->i_d.di_extsize ? ip->i_d.di_extsize : sbrtextsize;
437 numrtextents = (count_fsb + iprtextsize - 1);
438 do_div(numrtextents, sbrtextsize);
439 datablocks = 0;
440 } else {
441 datablocks = count_fsb;
442 numrtextents = 0;
443 }
444
445 /*
446 * allocate and setup the transaction
447 */
448 xfs_iunlock(ip, XFS_ILOCK_EXCL);
449 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
450
451 resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks);
452
453 error = xfs_trans_reserve(tp, resblks,
454 XFS_WRITE_LOG_RES(mp), numrtextents,
455 XFS_TRANS_PERM_LOG_RES,
456 XFS_WRITE_LOG_COUNT);
457
458 /*
459 * check for running out of space
460 */
461 if (error)
462 /*
463 * Free the transaction structure.
464 */
465 xfs_trans_cancel(tp, 0);
466
467 xfs_ilock(ip, XFS_ILOCK_EXCL);
468
469 if (error)
470 goto error_out; /* Don't return in above if .. trans ..,
471 need lock to return */
472
473 if (XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, resblks)) {
474 error = (EDQUOT);
475 goto error1;
476 }
477 nimaps = 1;
478
479 bmapi_flag = XFS_BMAPI_WRITE;
480 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
481 xfs_trans_ihold(tp, ip);
482
483 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))
484 bmapi_flag |= XFS_BMAPI_PREALLOC;
485
486 /*
487 * issue the bmapi() call to allocate the blocks
488 */
489 XFS_BMAP_INIT(&free_list, &firstfsb);
490 imapp = &imap[0];
491 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
492 bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list);
493 if (error) {
494 goto error0;
495 }
496
497 /*
498 * complete the transaction
499 */
500
501 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
502 if (error) {
503 goto error0;
504 }
505
506 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
507 if (error) {
508 goto error_out;
509 }
510
511 /* copy any maps to caller's array and return any error. */
512 if (nimaps == 0) {
513 error = (ENOSPC);
514 goto error_out;
515 }
516
517 *ret_imap = imap[0];
518 *nmaps = 1;
519 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
520 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
521 "start_block : %llx start_off : %llx blkcnt : %llx "
522 "extent-state : %x \n",
523 (ip->i_mount)->m_fsname,
524 (long long)ip->i_ino,
525 ret_imap->br_startblock, ret_imap->br_startoff,
526 ret_imap->br_blockcount,ret_imap->br_state);
527 }
528 return 0;
529
530 error0: /* Cancel bmap, unlock inode, and cancel trans */
531 xfs_bmap_cancel(&free_list);
532
533 error1: /* Just cancel transaction */
534 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
535 *nmaps = 0; /* nothing set-up here */
536
537 error_out:
538 return XFS_ERROR(error);
539 }
540
541 int
542 xfs_iomap_write_delay(
543 xfs_inode_t *ip,
544 loff_t offset,
545 size_t count,
546 int ioflag,
547 xfs_bmbt_irec_t *ret_imap,
548 int *nmaps)
549 {
550 xfs_mount_t *mp = ip->i_mount;
551 xfs_iocore_t *io = &ip->i_iocore;
552 xfs_fileoff_t offset_fsb;
553 xfs_fileoff_t last_fsb;
554 xfs_fsize_t isize;
555 xfs_fsblock_t firstblock;
556 int nimaps;
557 int error;
558 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
559 int aeof;
560 int fsynced = 0;
561
562 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
563
564 /*
565 * Make sure that the dquots are there. This doesn't hold
566 * the ilock across a disk read.
567 */
568
569 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
570 if (error)
571 return XFS_ERROR(error);
572
573 retry:
574 isize = ip->i_d.di_size;
575 if (io->io_new_size > isize) {
576 isize = io->io_new_size;
577 }
578
579 aeof = 0;
580 offset_fsb = XFS_B_TO_FSBT(mp, offset);
581 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
582 /*
583 * If the caller is doing a write at the end of the file,
584 * then extend the allocation (and the buffer used for the write)
585 * out to the file system's write iosize. We clean up any extra
586 * space left over when the file is closed in xfs_inactive().
587 *
588 * For sync writes, we are flushing delayed allocate space to
589 * try to make additional space available for allocation near
590 * the filesystem full boundary - preallocation hurts in that
591 * situation, of course.
592 */
593 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
594 xfs_off_t aligned_offset;
595 xfs_filblks_t count_fsb;
596 unsigned int iosize;
597 xfs_fileoff_t ioalign;
598 int n;
599 xfs_fileoff_t start_fsb;
600
601 /*
602 * If there are any real blocks past eof, then don't
603 * do any speculative allocation.
604 */
605 start_fsb = XFS_B_TO_FSBT(mp,
606 ((xfs_ufsize_t)(offset + count - 1)));
607 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
608 while (count_fsb > 0) {
609 nimaps = XFS_WRITE_IMAPS;
610 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
611 0, &firstblock, 0, imap, &nimaps, NULL);
612 if (error) {
613 return error;
614 }
615 for (n = 0; n < nimaps; n++) {
616 if ( !(io->io_flags & XFS_IOCORE_RT) &&
617 !imap[n].br_startblock) {
618 cmn_err(CE_PANIC,"Access to block "
619 "zero: fs <%s> inode: %lld "
620 "start_block : %llx start_off "
621 ": %llx blkcnt : %llx "
622 "extent-state : %x \n",
623 (ip->i_mount)->m_fsname,
624 (long long)ip->i_ino,
625 imap[n].br_startblock,
626 imap[n].br_startoff,
627 imap[n].br_blockcount,
628 imap[n].br_state);
629 }
630 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
631 (imap[n].br_startblock != DELAYSTARTBLOCK)) {
632 goto write_map;
633 }
634 start_fsb += imap[n].br_blockcount;
635 count_fsb -= imap[n].br_blockcount;
636 }
637 }
638 iosize = mp->m_writeio_blocks;
639 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
640 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
641 last_fsb = ioalign + iosize;
642 aeof = 1;
643 }
644 write_map:
645 nimaps = XFS_WRITE_IMAPS;
646 firstblock = NULLFSBLOCK;
647
648 /*
649 * If mounted with the "-o swalloc" option, roundup the allocation
650 * request to a stripe width boundary if the file size is >=
651 * stripe width and we are allocating past the allocation eof.
652 */
653 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth
654 && (mp->m_flags & XFS_MOUNT_SWALLOC)
655 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
656 int eof;
657 xfs_fileoff_t new_last_fsb;
658
659 new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
660 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
661 if (error) {
662 return error;
663 }
664 if (eof) {
665 last_fsb = new_last_fsb;
666 }
667 /*
668 * Roundup the allocation request to a stripe unit (m_dalign) boundary
669 * if the file size is >= stripe unit size, and we are allocating past
670 * the allocation eof.
671 */
672 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
673 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
674 int eof;
675 xfs_fileoff_t new_last_fsb;
676 new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
677 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
678 if (error) {
679 return error;
680 }
681 if (eof) {
682 last_fsb = new_last_fsb;
683 }
684 /*
685 * Round up the allocation request to a real-time extent boundary
686 * if the file is on the real-time subvolume.
687 */
688 } else if (io->io_flags & XFS_IOCORE_RT && aeof) {
689 int eof;
690 xfs_fileoff_t new_last_fsb;
691
692 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
693 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
694 if (error) {
695 return error;
696 }
697 if (eof)
698 last_fsb = new_last_fsb;
699 }
700 error = xfs_bmapi(NULL, ip, offset_fsb,
701 (xfs_filblks_t)(last_fsb - offset_fsb),
702 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
703 XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
704 &nimaps, NULL);
705 /*
706 * This can be EDQUOT, if nimaps == 0
707 */
708 if (error && (error != ENOSPC)) {
709 return XFS_ERROR(error);
710 }
711 /*
712 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
713 * then we must have run out of space.
714 */
715 if (nimaps == 0) {
716 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
717 io, offset, count);
718 if (xfs_flush_space(ip, &fsynced, &ioflag))
719 return XFS_ERROR(ENOSPC);
720
721 error = 0;
722 goto retry;
723 }
724
725 *ret_imap = imap[0];
726 *nmaps = 1;
727 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
728 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
729 "start_block : %llx start_off : %llx blkcnt : %llx "
730 "extent-state : %x \n",
731 (ip->i_mount)->m_fsname,
732 (long long)ip->i_ino,
733 ret_imap->br_startblock, ret_imap->br_startoff,
734 ret_imap->br_blockcount,ret_imap->br_state);
735 }
736 return 0;
737 }
738
739 /*
740 * Pass in a delayed allocate extent, convert it to real extents;
741 * return to the caller the extent we create which maps on top of
742 * the originating callers request.
743 *
744 * Called without a lock on the inode.
745 */
746 int
747 xfs_iomap_write_allocate(
748 xfs_inode_t *ip,
749 xfs_bmbt_irec_t *map,
750 int *retmap)
751 {
752 xfs_mount_t *mp = ip->i_mount;
753 xfs_iocore_t *io = &ip->i_iocore;
754 xfs_fileoff_t offset_fsb, last_block;
755 xfs_fileoff_t end_fsb, map_start_fsb;
756 xfs_fsblock_t first_block;
757 xfs_bmap_free_t free_list;
758 xfs_filblks_t count_fsb;
759 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
760 xfs_trans_t *tp;
761 int i, nimaps, committed;
762 int error = 0;
763 int nres;
764
765 *retmap = 0;
766
767 /*
768 * Make sure that the dquots are there.
769 */
770 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
771 return XFS_ERROR(error);
772
773 offset_fsb = map->br_startoff;
774 count_fsb = map->br_blockcount;
775 map_start_fsb = offset_fsb;
776
777 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
778
779 while (count_fsb != 0) {
780 /*
781 * Set up a transaction with which to allocate the
782 * backing store for the file. Do allocations in a
783 * loop until we get some space in the range we are
784 * interested in. The other space that might be allocated
785 * is in the delayed allocation extent on which we sit
786 * but before our buffer starts.
787 */
788
789 nimaps = 0;
790 while (nimaps == 0) {
791 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
792 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
793 error = xfs_trans_reserve(tp, nres,
794 XFS_WRITE_LOG_RES(mp),
795 0, XFS_TRANS_PERM_LOG_RES,
796 XFS_WRITE_LOG_COUNT);
797 if (error == ENOSPC) {
798 error = xfs_trans_reserve(tp, 0,
799 XFS_WRITE_LOG_RES(mp),
800 0,
801 XFS_TRANS_PERM_LOG_RES,
802 XFS_WRITE_LOG_COUNT);
803 }
804 if (error) {
805 xfs_trans_cancel(tp, 0);
806 return XFS_ERROR(error);
807 }
808 xfs_ilock(ip, XFS_ILOCK_EXCL);
809 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
810 xfs_trans_ihold(tp, ip);
811
812 XFS_BMAP_INIT(&free_list, &first_block);
813
814 nimaps = XFS_STRAT_WRITE_IMAPS;
815 /*
816 * Ensure we don't go beyond eof - it is possible
817 * the extents changed since we did the read call,
818 * we dropped the ilock in the interim.
819 */
820
821 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size);
822 xfs_bmap_last_offset(NULL, ip, &last_block,
823 XFS_DATA_FORK);
824 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
825 if ((map_start_fsb + count_fsb) > last_block) {
826 count_fsb = last_block - map_start_fsb;
827 if (count_fsb == 0) {
828 error = EAGAIN;
829 goto trans_cancel;
830 }
831 }
832
833 /* Go get the actual blocks */
834 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
835 XFS_BMAPI_WRITE, &first_block, 1,
836 imap, &nimaps, &free_list);
837 if (error)
838 goto trans_cancel;
839
840 error = xfs_bmap_finish(&tp, &free_list,
841 first_block, &committed);
842 if (error)
843 goto trans_cancel;
844
845 error = xfs_trans_commit(tp,
846 XFS_TRANS_RELEASE_LOG_RES, NULL);
847 if (error)
848 goto error0;
849
850 xfs_iunlock(ip, XFS_ILOCK_EXCL);
851 }
852
853 /*
854 * See if we were able to allocate an extent that
855 * covers at least part of the callers request
856 */
857
858 for (i = 0; i < nimaps; i++) {
859 if ( !(io->io_flags & XFS_IOCORE_RT) &&
860 !imap[i].br_startblock) {
861 cmn_err(CE_PANIC,"Access to block zero: "
862 "fs <%s> inode: %lld "
863 "start_block : %llx start_off : %llx "
864 "blkcnt : %llx extent-state : %x \n",
865 (ip->i_mount)->m_fsname,
866 (long long)ip->i_ino,
867 imap[i].br_startblock,
868 imap[i].br_startoff,
869 imap[i].br_blockcount,imap[i].br_state);
870 }
871 if ((map->br_startoff >= imap[i].br_startoff) &&
872 (map->br_startoff < (imap[i].br_startoff +
873 imap[i].br_blockcount))) {
874 *map = imap[i];
875 *retmap = 1;
876 XFS_STATS_INC(xs_xstrat_quick);
877 return 0;
878 }
879 count_fsb -= imap[i].br_blockcount;
880 }
881
882 /* So far we have not mapped the requested part of the
883 * file, just surrounding data, try again.
884 */
885 nimaps--;
886 offset_fsb = imap[nimaps].br_startoff +
887 imap[nimaps].br_blockcount;
888 map_start_fsb = offset_fsb;
889 }
890
891 trans_cancel:
892 xfs_bmap_cancel(&free_list);
893 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
894 error0:
895 xfs_iunlock(ip, XFS_ILOCK_EXCL);
896 return XFS_ERROR(error);
897 }
898
899 int
900 xfs_iomap_write_unwritten(
901 xfs_inode_t *ip,
902 loff_t offset,
903 size_t count)
904 {
905 xfs_mount_t *mp = ip->i_mount;
906 xfs_iocore_t *io = &ip->i_iocore;
907 xfs_trans_t *tp;
908 xfs_fileoff_t offset_fsb;
909 xfs_filblks_t count_fsb;
910 xfs_filblks_t numblks_fsb;
911 xfs_bmbt_irec_t imap;
912 int committed;
913 int error;
914 int nres;
915 int nimaps;
916 xfs_fsblock_t firstfsb;
917 xfs_bmap_free_t free_list;
918
919 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
920 &ip->i_iocore, offset, count);
921
922 offset_fsb = XFS_B_TO_FSBT(mp, offset);
923 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
924 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
925
926 do {
927 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
928
929 /*
930 * set up a transaction to convert the range of extents
931 * from unwritten to real. Do allocations in a loop until
932 * we have covered the range passed in.
933 */
934
935 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
936 error = xfs_trans_reserve(tp, nres,
937 XFS_WRITE_LOG_RES(mp), 0,
938 XFS_TRANS_PERM_LOG_RES,
939 XFS_WRITE_LOG_COUNT);
940 if (error) {
941 xfs_trans_cancel(tp, 0);
942 goto error0;
943 }
944
945 xfs_ilock(ip, XFS_ILOCK_EXCL);
946 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
947 xfs_trans_ihold(tp, ip);
948
949 /*
950 * Modify the unwritten extent state of the buffer.
951 */
952 XFS_BMAP_INIT(&free_list, &firstfsb);
953 nimaps = 1;
954 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
955 XFS_BMAPI_WRITE, &firstfsb,
956 1, &imap, &nimaps, &free_list);
957 if (error)
958 goto error_on_bmapi_transaction;
959
960 error = xfs_bmap_finish(&(tp), &(free_list),
961 firstfsb, &committed);
962 if (error)
963 goto error_on_bmapi_transaction;
964
965 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
966 xfs_iunlock(ip, XFS_ILOCK_EXCL);
967 if (error)
968 goto error0;
969
970 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) {
971 cmn_err(CE_PANIC,"Access to block zero: fs <%s> "
972 "inode: %lld start_block : %llx start_off : "
973 "%llx blkcnt : %llx extent-state : %x \n",
974 (ip->i_mount)->m_fsname,
975 (long long)ip->i_ino,
976 imap.br_startblock,imap.br_startoff,
977 imap.br_blockcount,imap.br_state);
978 }
979
980 if ((numblks_fsb = imap.br_blockcount) == 0) {
981 /*
982 * The numblks_fsb value should always get
983 * smaller, otherwise the loop is stuck.
984 */
985 ASSERT(imap.br_blockcount);
986 break;
987 }
988 offset_fsb += numblks_fsb;
989 count_fsb -= numblks_fsb;
990 } while (count_fsb > 0);
991
992 return 0;
993
994 error_on_bmapi_transaction:
995 xfs_bmap_cancel(&free_list);
996 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
997 xfs_iunlock(ip, XFS_ILOCK_EXCL);
998 error0:
999 return XFS_ERROR(error);
1000 }
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