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[deliverable/linux.git] / fs / xfs / xfs_iomap.c
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 &&
282 (imap.br_startblock != HOLESTARTBLOCK) &&
283 (imap.br_startblock != DELAYSTARTBLOCK)) {
284 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
285 offset, count, iomapp, &imap, flags);
286 break;
287 }
288
289 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
290 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,
291 count, flags, &imap, &nimaps, nimaps);
292 } else {
293 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,
294 flags, &imap, &nimaps);
295 }
296 if (!error) {
297 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,
298 offset, count, iomapp, &imap, flags);
299 }
300 iomap_flags = IOMAP_NEW;
301 break;
302 case BMAPI_ALLOCATE:
303 /* If we found an extent, return it */
304 XFS_IUNLOCK(mp, io, lockmode);
305 lockmode = 0;
306
307 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
308 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
309 offset, count, iomapp, &imap, flags);
310 break;
311 }
312
313 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count,
314 &imap, &nimaps);
315 break;
316 case BMAPI_UNWRITTEN:
317 lockmode = 0;
318 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
319 nimaps = 0;
320 break;
321 }
322
323 if (nimaps) {
324 *niomaps = xfs_imap_to_bmap(io, offset, &imap,
325 iomapp, nimaps, *niomaps, iomap_flags);
326 } else if (niomaps) {
327 *niomaps = 0;
328 }
329
330 out:
331 if (lockmode)
332 XFS_IUNLOCK(mp, io, lockmode);
333 return XFS_ERROR(error);
334 }
335
336 STATIC int
337 xfs_flush_space(
338 xfs_inode_t *ip,
339 int *fsynced,
340 int *ioflags)
341 {
342 switch (*fsynced) {
343 case 0:
344 if (ip->i_delayed_blks) {
345 xfs_iunlock(ip, XFS_ILOCK_EXCL);
346 xfs_flush_inode(ip);
347 xfs_ilock(ip, XFS_ILOCK_EXCL);
348 *fsynced = 1;
349 } else {
350 *ioflags |= BMAPI_SYNC;
351 *fsynced = 2;
352 }
353 return 0;
354 case 1:
355 *fsynced = 2;
356 *ioflags |= BMAPI_SYNC;
357 return 0;
358 case 2:
359 xfs_iunlock(ip, XFS_ILOCK_EXCL);
360 xfs_flush_device(ip);
361 xfs_ilock(ip, XFS_ILOCK_EXCL);
362 *fsynced = 3;
363 return 0;
364 }
365 return 1;
366 }
367
368 int
369 xfs_iomap_write_direct(
370 xfs_inode_t *ip,
371 xfs_off_t offset,
372 size_t count,
373 int flags,
374 xfs_bmbt_irec_t *ret_imap,
375 int *nmaps,
376 int found)
377 {
378 xfs_mount_t *mp = ip->i_mount;
379 xfs_iocore_t *io = &ip->i_iocore;
380 xfs_fileoff_t offset_fsb;
381 xfs_fileoff_t last_fsb;
382 xfs_filblks_t count_fsb;
383 xfs_fsize_t isize;
384 xfs_fsblock_t firstfsb;
385 int nimaps, maps;
386 int error;
387 int bmapi_flag;
388 int quota_flag;
389 int rt;
390 xfs_trans_t *tp;
391 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp;
392 xfs_bmap_free_t free_list;
393 int aeof;
394 xfs_filblks_t qblocks, resblks;
395 int committed;
396 int resrtextents;
397
398 /*
399 * Make sure that the dquots are there. This doesn't hold
400 * the ilock across a disk read.
401 */
402 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
403 if (error)
404 return XFS_ERROR(error);
405
406 maps = min(XFS_WRITE_IMAPS, *nmaps);
407 nimaps = maps;
408
409 isize = ip->i_d.di_size;
410 aeof = (offset + count) > isize;
411
412 if (io->io_new_size > isize)
413 isize = io->io_new_size;
414
415 offset_fsb = XFS_B_TO_FSBT(mp, offset);
416 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
417 count_fsb = last_fsb - offset_fsb;
418 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {
419 xfs_fileoff_t map_last_fsb;
420
421 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;
422 if (map_last_fsb < last_fsb) {
423 last_fsb = map_last_fsb;
424 count_fsb = last_fsb - offset_fsb;
425 }
426 ASSERT(count_fsb > 0);
427 }
428
429 /*
430 * Determine if reserving space on the data or realtime partition.
431 */
432 if ((rt = XFS_IS_REALTIME_INODE(ip))) {
433 xfs_extlen_t extsz;
434
435 if (!(extsz = ip->i_d.di_extsize))
436 extsz = mp->m_sb.sb_rextsize;
437 resrtextents = qblocks = (count_fsb + extsz - 1);
438 do_div(resrtextents, mp->m_sb.sb_rextsize);
439 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
440 quota_flag = XFS_QMOPT_RES_RTBLKS;
441 } else {
442 resrtextents = 0;
443 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, count_fsb);
444 quota_flag = XFS_QMOPT_RES_REGBLKS;
445 }
446
447 /*
448 * Allocate and setup the transaction
449 */
450 xfs_iunlock(ip, XFS_ILOCK_EXCL);
451 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
452 error = xfs_trans_reserve(tp, resblks,
453 XFS_WRITE_LOG_RES(mp), resrtextents,
454 XFS_TRANS_PERM_LOG_RES,
455 XFS_WRITE_LOG_COUNT);
456
457 /*
458 * Check for running out of space, note: need lock to return
459 */
460 if (error)
461 xfs_trans_cancel(tp, 0);
462 xfs_ilock(ip, XFS_ILOCK_EXCL);
463 if (error)
464 goto error_out;
465
466 if (XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag)) {
467 error = (EDQUOT);
468 goto error1;
469 }
470
471 bmapi_flag = XFS_BMAPI_WRITE;
472 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
473 xfs_trans_ihold(tp, ip);
474
475 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))
476 bmapi_flag |= XFS_BMAPI_PREALLOC;
477
478 /*
479 * Issue the bmapi() call to allocate the blocks
480 */
481 XFS_BMAP_INIT(&free_list, &firstfsb);
482 nimaps = 1;
483 imapp = &imap[0];
484 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
485 bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list);
486 if (error)
487 goto error0;
488
489 /*
490 * Complete the transaction
491 */
492 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
493 if (error)
494 goto error0;
495 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
496 if (error)
497 goto error_out;
498
499 /*
500 * Copy any maps to caller's array and return any error.
501 */
502 if (nimaps == 0) {
503 error = (ENOSPC);
504 goto error_out;
505 }
506
507 *ret_imap = imap[0];
508 *nmaps = 1;
509 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
510 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
511 "start_block : %llx start_off : %llx blkcnt : %llx "
512 "extent-state : %x \n",
513 (ip->i_mount)->m_fsname,
514 (long long)ip->i_ino,
515 ret_imap->br_startblock, ret_imap->br_startoff,
516 ret_imap->br_blockcount,ret_imap->br_state);
517 }
518 return 0;
519
520 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
521 xfs_bmap_cancel(&free_list);
522 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
523
524 error1: /* Just cancel transaction */
525 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
526 *nmaps = 0; /* nothing set-up here */
527
528 error_out:
529 return XFS_ERROR(error);
530 }
531
532 int
533 xfs_iomap_write_delay(
534 xfs_inode_t *ip,
535 xfs_off_t offset,
536 size_t count,
537 int ioflag,
538 xfs_bmbt_irec_t *ret_imap,
539 int *nmaps)
540 {
541 xfs_mount_t *mp = ip->i_mount;
542 xfs_iocore_t *io = &ip->i_iocore;
543 xfs_fileoff_t offset_fsb;
544 xfs_fileoff_t last_fsb;
545 xfs_fsize_t isize;
546 xfs_fsblock_t firstblock;
547 int nimaps;
548 int error;
549 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
550 int aeof;
551 int fsynced = 0;
552
553 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
554
555 /*
556 * Make sure that the dquots are there. This doesn't hold
557 * the ilock across a disk read.
558 */
559
560 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
561 if (error)
562 return XFS_ERROR(error);
563
564 retry:
565 isize = ip->i_d.di_size;
566 if (io->io_new_size > isize) {
567 isize = io->io_new_size;
568 }
569
570 aeof = 0;
571 offset_fsb = XFS_B_TO_FSBT(mp, offset);
572 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
573 /*
574 * If the caller is doing a write at the end of the file,
575 * then extend the allocation (and the buffer used for the write)
576 * out to the file system's write iosize. We clean up any extra
577 * space left over when the file is closed in xfs_inactive().
578 *
579 * For sync writes, we are flushing delayed allocate space to
580 * try to make additional space available for allocation near
581 * the filesystem full boundary - preallocation hurts in that
582 * situation, of course.
583 */
584 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
585 xfs_off_t aligned_offset;
586 xfs_filblks_t count_fsb;
587 unsigned int iosize;
588 xfs_fileoff_t ioalign;
589 int n;
590 xfs_fileoff_t start_fsb;
591
592 /*
593 * If there are any real blocks past eof, then don't
594 * do any speculative allocation.
595 */
596 start_fsb = XFS_B_TO_FSBT(mp,
597 ((xfs_ufsize_t)(offset + count - 1)));
598 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
599 while (count_fsb > 0) {
600 nimaps = XFS_WRITE_IMAPS;
601 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
602 0, &firstblock, 0, imap, &nimaps, NULL);
603 if (error) {
604 return error;
605 }
606 for (n = 0; n < nimaps; n++) {
607 if ( !(io->io_flags & XFS_IOCORE_RT) &&
608 !imap[n].br_startblock) {
609 cmn_err(CE_PANIC,"Access to block "
610 "zero: fs <%s> inode: %lld "
611 "start_block : %llx start_off "
612 ": %llx blkcnt : %llx "
613 "extent-state : %x \n",
614 (ip->i_mount)->m_fsname,
615 (long long)ip->i_ino,
616 imap[n].br_startblock,
617 imap[n].br_startoff,
618 imap[n].br_blockcount,
619 imap[n].br_state);
620 }
621 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
622 (imap[n].br_startblock != DELAYSTARTBLOCK)) {
623 goto write_map;
624 }
625 start_fsb += imap[n].br_blockcount;
626 count_fsb -= imap[n].br_blockcount;
627 }
628 }
629 iosize = mp->m_writeio_blocks;
630 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
631 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
632 last_fsb = ioalign + iosize;
633 aeof = 1;
634 }
635 write_map:
636 nimaps = XFS_WRITE_IMAPS;
637 firstblock = NULLFSBLOCK;
638
639 /*
640 * If mounted with the "-o swalloc" option, roundup the allocation
641 * request to a stripe width boundary if the file size is >=
642 * stripe width and we are allocating past the allocation eof.
643 */
644 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth
645 && (mp->m_flags & XFS_MOUNT_SWALLOC)
646 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
647 int eof;
648 xfs_fileoff_t new_last_fsb;
649
650 new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
651 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
652 if (error) {
653 return error;
654 }
655 if (eof) {
656 last_fsb = new_last_fsb;
657 }
658 /*
659 * Roundup the allocation request to a stripe unit (m_dalign) boundary
660 * if the file size is >= stripe unit size, and we are allocating past
661 * the allocation eof.
662 */
663 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
664 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
665 int eof;
666 xfs_fileoff_t new_last_fsb;
667 new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
668 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
669 if (error) {
670 return error;
671 }
672 if (eof) {
673 last_fsb = new_last_fsb;
674 }
675 /*
676 * Round up the allocation request to a real-time extent boundary
677 * if the file is on the real-time subvolume.
678 */
679 } else if (io->io_flags & XFS_IOCORE_RT && aeof) {
680 int eof;
681 xfs_fileoff_t new_last_fsb;
682
683 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
684 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
685 if (error) {
686 return error;
687 }
688 if (eof)
689 last_fsb = new_last_fsb;
690 }
691 error = xfs_bmapi(NULL, ip, offset_fsb,
692 (xfs_filblks_t)(last_fsb - offset_fsb),
693 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
694 XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
695 &nimaps, NULL);
696 /*
697 * This can be EDQUOT, if nimaps == 0
698 */
699 if (error && (error != ENOSPC)) {
700 return XFS_ERROR(error);
701 }
702 /*
703 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
704 * then we must have run out of space.
705 */
706 if (nimaps == 0) {
707 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
708 io, offset, count);
709 if (xfs_flush_space(ip, &fsynced, &ioflag))
710 return XFS_ERROR(ENOSPC);
711
712 error = 0;
713 goto retry;
714 }
715
716 *ret_imap = imap[0];
717 *nmaps = 1;
718 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
719 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
720 "start_block : %llx start_off : %llx blkcnt : %llx "
721 "extent-state : %x \n",
722 (ip->i_mount)->m_fsname,
723 (long long)ip->i_ino,
724 ret_imap->br_startblock, ret_imap->br_startoff,
725 ret_imap->br_blockcount,ret_imap->br_state);
726 }
727 return 0;
728 }
729
730 /*
731 * Pass in a delayed allocate extent, convert it to real extents;
732 * return to the caller the extent we create which maps on top of
733 * the originating callers request.
734 *
735 * Called without a lock on the inode.
736 */
737 int
738 xfs_iomap_write_allocate(
739 xfs_inode_t *ip,
740 xfs_off_t offset,
741 size_t count,
742 xfs_bmbt_irec_t *map,
743 int *retmap)
744 {
745 xfs_mount_t *mp = ip->i_mount;
746 xfs_iocore_t *io = &ip->i_iocore;
747 xfs_fileoff_t offset_fsb, last_block;
748 xfs_fileoff_t end_fsb, map_start_fsb;
749 xfs_fsblock_t first_block;
750 xfs_bmap_free_t free_list;
751 xfs_filblks_t count_fsb;
752 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
753 xfs_trans_t *tp;
754 int i, nimaps, committed;
755 int error = 0;
756 int nres;
757
758 *retmap = 0;
759
760 /*
761 * Make sure that the dquots are there.
762 */
763 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
764 return XFS_ERROR(error);
765
766 offset_fsb = XFS_B_TO_FSBT(mp, offset);
767 count_fsb = map->br_blockcount;
768 map_start_fsb = map->br_startoff;
769
770 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
771
772 while (count_fsb != 0) {
773 /*
774 * Set up a transaction with which to allocate the
775 * backing store for the file. Do allocations in a
776 * loop until we get some space in the range we are
777 * interested in. The other space that might be allocated
778 * is in the delayed allocation extent on which we sit
779 * but before our buffer starts.
780 */
781
782 nimaps = 0;
783 while (nimaps == 0) {
784 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
785 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
786 error = xfs_trans_reserve(tp, nres,
787 XFS_WRITE_LOG_RES(mp),
788 0, XFS_TRANS_PERM_LOG_RES,
789 XFS_WRITE_LOG_COUNT);
790 if (error == ENOSPC) {
791 error = xfs_trans_reserve(tp, 0,
792 XFS_WRITE_LOG_RES(mp),
793 0,
794 XFS_TRANS_PERM_LOG_RES,
795 XFS_WRITE_LOG_COUNT);
796 }
797 if (error) {
798 xfs_trans_cancel(tp, 0);
799 return XFS_ERROR(error);
800 }
801 xfs_ilock(ip, XFS_ILOCK_EXCL);
802 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
803 xfs_trans_ihold(tp, ip);
804
805 XFS_BMAP_INIT(&free_list, &first_block);
806
807 nimaps = XFS_STRAT_WRITE_IMAPS;
808 /*
809 * Ensure we don't go beyond eof - it is possible
810 * the extents changed since we did the read call,
811 * we dropped the ilock in the interim.
812 */
813
814 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size);
815 xfs_bmap_last_offset(NULL, ip, &last_block,
816 XFS_DATA_FORK);
817 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
818 if ((map_start_fsb + count_fsb) > last_block) {
819 count_fsb = last_block - map_start_fsb;
820 if (count_fsb == 0) {
821 error = EAGAIN;
822 goto trans_cancel;
823 }
824 }
825
826 /* Go get the actual blocks */
827 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
828 XFS_BMAPI_WRITE, &first_block, 1,
829 imap, &nimaps, &free_list);
830 if (error)
831 goto trans_cancel;
832
833 error = xfs_bmap_finish(&tp, &free_list,
834 first_block, &committed);
835 if (error)
836 goto trans_cancel;
837
838 error = xfs_trans_commit(tp,
839 XFS_TRANS_RELEASE_LOG_RES, NULL);
840 if (error)
841 goto error0;
842
843 xfs_iunlock(ip, XFS_ILOCK_EXCL);
844 }
845
846 /*
847 * See if we were able to allocate an extent that
848 * covers at least part of the callers request
849 */
850
851 for (i = 0; i < nimaps; i++) {
852 if ( !(io->io_flags & XFS_IOCORE_RT) &&
853 !imap[i].br_startblock) {
854 cmn_err(CE_PANIC,"Access to block zero: "
855 "fs <%s> inode: %lld "
856 "start_block : %llx start_off : %llx "
857 "blkcnt : %llx extent-state : %x \n",
858 (ip->i_mount)->m_fsname,
859 (long long)ip->i_ino,
860 imap[i].br_startblock,
861 imap[i].br_startoff,
862 imap[i].br_blockcount,imap[i].br_state);
863 }
864 if ((offset_fsb >= imap[i].br_startoff) &&
865 (offset_fsb < (imap[i].br_startoff +
866 imap[i].br_blockcount))) {
867 *map = imap[i];
868 *retmap = 1;
869 XFS_STATS_INC(xs_xstrat_quick);
870 return 0;
871 }
872 count_fsb -= imap[i].br_blockcount;
873 }
874
875 /* So far we have not mapped the requested part of the
876 * file, just surrounding data, try again.
877 */
878 nimaps--;
879 map_start_fsb = imap[nimaps].br_startoff +
880 imap[nimaps].br_blockcount;
881 }
882
883 trans_cancel:
884 xfs_bmap_cancel(&free_list);
885 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
886 error0:
887 xfs_iunlock(ip, XFS_ILOCK_EXCL);
888 return XFS_ERROR(error);
889 }
890
891 int
892 xfs_iomap_write_unwritten(
893 xfs_inode_t *ip,
894 xfs_off_t offset,
895 size_t count)
896 {
897 xfs_mount_t *mp = ip->i_mount;
898 xfs_iocore_t *io = &ip->i_iocore;
899 xfs_trans_t *tp;
900 xfs_fileoff_t offset_fsb;
901 xfs_filblks_t count_fsb;
902 xfs_filblks_t numblks_fsb;
903 xfs_bmbt_irec_t imap;
904 int committed;
905 int error;
906 int nres;
907 int nimaps;
908 xfs_fsblock_t firstfsb;
909 xfs_bmap_free_t free_list;
910
911 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
912 &ip->i_iocore, offset, count);
913
914 offset_fsb = XFS_B_TO_FSBT(mp, offset);
915 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
916 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
917
918 do {
919 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
920
921 /*
922 * set up a transaction to convert the range of extents
923 * from unwritten to real. Do allocations in a loop until
924 * we have covered the range passed in.
925 */
926
927 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
928 error = xfs_trans_reserve(tp, nres,
929 XFS_WRITE_LOG_RES(mp), 0,
930 XFS_TRANS_PERM_LOG_RES,
931 XFS_WRITE_LOG_COUNT);
932 if (error) {
933 xfs_trans_cancel(tp, 0);
934 goto error0;
935 }
936
937 xfs_ilock(ip, XFS_ILOCK_EXCL);
938 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
939 xfs_trans_ihold(tp, ip);
940
941 /*
942 * Modify the unwritten extent state of the buffer.
943 */
944 XFS_BMAP_INIT(&free_list, &firstfsb);
945 nimaps = 1;
946 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
947 XFS_BMAPI_WRITE, &firstfsb,
948 1, &imap, &nimaps, &free_list);
949 if (error)
950 goto error_on_bmapi_transaction;
951
952 error = xfs_bmap_finish(&(tp), &(free_list),
953 firstfsb, &committed);
954 if (error)
955 goto error_on_bmapi_transaction;
956
957 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
958 xfs_iunlock(ip, XFS_ILOCK_EXCL);
959 if (error)
960 goto error0;
961
962 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) {
963 cmn_err(CE_PANIC,"Access to block zero: fs <%s> "
964 "inode: %lld start_block : %llx start_off : "
965 "%llx blkcnt : %llx extent-state : %x \n",
966 (ip->i_mount)->m_fsname,
967 (long long)ip->i_ino,
968 imap.br_startblock,imap.br_startoff,
969 imap.br_blockcount,imap.br_state);
970 }
971
972 if ((numblks_fsb = imap.br_blockcount) == 0) {
973 /*
974 * The numblks_fsb value should always get
975 * smaller, otherwise the loop is stuck.
976 */
977 ASSERT(imap.br_blockcount);
978 break;
979 }
980 offset_fsb += numblks_fsb;
981 count_fsb -= numblks_fsb;
982 } while (count_fsb > 0);
983
984 return 0;
985
986 error_on_bmapi_transaction:
987 xfs_bmap_cancel(&free_list);
988 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
989 xfs_iunlock(ip, XFS_ILOCK_EXCL);
990 error0:
991 return XFS_ERROR(error);
992 }
Linux kernel - Deliverables
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