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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / fs / xfs / xfs_iomap.c
blob991f8a61f7c4fa4d91b187e0ee5507e9fc3db3c0
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, offset, count,
312 &imap, &nimaps);
313 break;
314 case BMAPI_UNWRITTEN:
315 lockmode = 0;
316 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
317 nimaps = 0;
318 break;
319 }
320
321 if (nimaps) {
322 *niomaps = xfs_imap_to_bmap(io, offset, &imap,
323 iomapp, nimaps, *niomaps, iomap_flags);
324 } else if (niomaps) {
325 *niomaps = 0;
326 }
327
328 out:
329 if (lockmode)
330 XFS_IUNLOCK(mp, io, lockmode);
331 return XFS_ERROR(error);
332 }
333
334 STATIC int
335 xfs_flush_space(
336 xfs_inode_t *ip,
337 int *fsynced,
338 int *ioflags)
339 {
340 switch (*fsynced) {
341 case 0:
342 if (ip->i_delayed_blks) {
343 xfs_iunlock(ip, XFS_ILOCK_EXCL);
344 xfs_flush_inode(ip);
345 xfs_ilock(ip, XFS_ILOCK_EXCL);
346 *fsynced = 1;
347 } else {
348 *ioflags |= BMAPI_SYNC;
349 *fsynced = 2;
350 }
351 return 0;
352 case 1:
353 *fsynced = 2;
354 *ioflags |= BMAPI_SYNC;
355 return 0;
356 case 2:
357 xfs_iunlock(ip, XFS_ILOCK_EXCL);
358 xfs_flush_device(ip);
359 xfs_ilock(ip, XFS_ILOCK_EXCL);
360 *fsynced = 3;
361 return 0;
362 }
363 return 1;
364 }
365
366 int
367 xfs_iomap_write_direct(
368 xfs_inode_t *ip,
369 xfs_off_t offset,
370 size_t count,
371 int flags,
372 xfs_bmbt_irec_t *ret_imap,
373 int *nmaps,
374 int found)
375 {
376 xfs_mount_t *mp = ip->i_mount;
377 xfs_iocore_t *io = &ip->i_iocore;
378 xfs_fileoff_t offset_fsb;
379 xfs_fileoff_t last_fsb;
380 xfs_filblks_t count_fsb;
381 xfs_fsize_t isize;
382 xfs_fsblock_t firstfsb;
383 int nimaps, maps;
384 int error;
385 int bmapi_flag;
386 int rt;
387 xfs_trans_t *tp;
388 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp;
389 xfs_bmap_free_t free_list;
390 int aeof;
391 xfs_filblks_t datablocks;
392 int committed;
393 int numrtextents;
394 uint resblks;
395
396 /*
397 * Make sure that the dquots are there. This doesn't hold
398 * the ilock across a disk read.
399 */
400 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
401 if (error)
402 return XFS_ERROR(error);
403
404 maps = min(XFS_WRITE_IMAPS, *nmaps);
405 nimaps = maps;
406
407 isize = ip->i_d.di_size;
408 aeof = (offset + count) > isize;
409
410 if (io->io_new_size > isize)
411 isize = io->io_new_size;
412
413 offset_fsb = XFS_B_TO_FSBT(mp, offset);
414 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
415 count_fsb = last_fsb - offset_fsb;
416 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {
417 xfs_fileoff_t map_last_fsb;
418
419 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;
420
421 if (map_last_fsb < last_fsb) {
422 last_fsb = map_last_fsb;
423 count_fsb = last_fsb - offset_fsb;
424 }
425 ASSERT(count_fsb > 0);
426 }
427
428 /*
429 * determine if reserving space on
430 * the data or realtime partition.
431 */
432 if ((rt = XFS_IS_REALTIME_INODE(ip))) {
433 int sbrtextsize, iprtextsize;
434
435 sbrtextsize = mp->m_sb.sb_rextsize;
436 iprtextsize =
437 ip->i_d.di_extsize ? ip->i_d.di_extsize : sbrtextsize;
438 numrtextents = (count_fsb + iprtextsize - 1);
439 do_div(numrtextents, sbrtextsize);
440 datablocks = 0;
441 } else {
442 datablocks = count_fsb;
443 numrtextents = 0;
444 }
445
446 /*
447 * allocate and setup the transaction
448 */
449 xfs_iunlock(ip, XFS_ILOCK_EXCL);
450 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
451
452 resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks);
453
454 error = xfs_trans_reserve(tp, resblks,
455 XFS_WRITE_LOG_RES(mp), numrtextents,
456 XFS_TRANS_PERM_LOG_RES,
457 XFS_WRITE_LOG_COUNT);
458
459 /*
460 * check for running out of space
461 */
462 if (error)
463 /*
464 * Free the transaction structure.
465 */
466 xfs_trans_cancel(tp, 0);
467
468 xfs_ilock(ip, XFS_ILOCK_EXCL);
469
470 if (error)
471 goto error_out; /* Don't return in above if .. trans ..,
472 need lock to return */
473
474 if (XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, resblks)) {
475 error = (EDQUOT);
476 goto error1;
477 }
478 nimaps = 1;
479
480 bmapi_flag = XFS_BMAPI_WRITE;
481 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
482 xfs_trans_ihold(tp, ip);
483
484 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))
485 bmapi_flag |= XFS_BMAPI_PREALLOC;
486
487 /*
488 * issue the bmapi() call to allocate the blocks
489 */
490 XFS_BMAP_INIT(&free_list, &firstfsb);
491 imapp = &imap[0];
492 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
493 bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list);
494 if (error) {
495 goto error0;
496 }
497
498 /*
499 * complete the transaction
500 */
501
502 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
503 if (error) {
504 goto error0;
505 }
506
507 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
508 if (error) {
509 goto error_out;
510 }
511
512 /* copy any maps to caller's array and return any error. */
513 if (nimaps == 0) {
514 error = (ENOSPC);
515 goto error_out;
516 }
517
518 *ret_imap = imap[0];
519 *nmaps = 1;
520 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
521 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
522 "start_block : %llx start_off : %llx blkcnt : %llx "
523 "extent-state : %x \n",
524 (ip->i_mount)->m_fsname,
525 (long long)ip->i_ino,
526 ret_imap->br_startblock, ret_imap->br_startoff,
527 ret_imap->br_blockcount,ret_imap->br_state);
528 }
529 return 0;
530
531 error0: /* Cancel bmap, unlock inode, and cancel trans */
532 xfs_bmap_cancel(&free_list);
533
534 error1: /* Just cancel transaction */
535 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
536 *nmaps = 0; /* nothing set-up here */
537
538 error_out:
539 return XFS_ERROR(error);
540 }
541
542 int
543 xfs_iomap_write_delay(
544 xfs_inode_t *ip,
545 xfs_off_t offset,
546 size_t count,
547 int ioflag,
548 xfs_bmbt_irec_t *ret_imap,
549 int *nmaps)
550 {
551 xfs_mount_t *mp = ip->i_mount;
552 xfs_iocore_t *io = &ip->i_iocore;
553 xfs_fileoff_t offset_fsb;
554 xfs_fileoff_t last_fsb;
555 xfs_fsize_t isize;
556 xfs_fsblock_t firstblock;
557 int nimaps;
558 int error;
559 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
560 int aeof;
561 int fsynced = 0;
562
563 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
564
565 /*
566 * Make sure that the dquots are there. This doesn't hold
567 * the ilock across a disk read.
568 */
569
570 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
571 if (error)
572 return XFS_ERROR(error);
573
574 retry:
575 isize = ip->i_d.di_size;
576 if (io->io_new_size > isize) {
577 isize = io->io_new_size;
578 }
579
580 aeof = 0;
581 offset_fsb = XFS_B_TO_FSBT(mp, offset);
582 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
583 /*
584 * If the caller is doing a write at the end of the file,
585 * then extend the allocation (and the buffer used for the write)
586 * out to the file system's write iosize. We clean up any extra
587 * space left over when the file is closed in xfs_inactive().
588 *
589 * For sync writes, we are flushing delayed allocate space to
590 * try to make additional space available for allocation near
591 * the filesystem full boundary - preallocation hurts in that
592 * situation, of course.
593 */
594 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
595 xfs_off_t aligned_offset;
596 xfs_filblks_t count_fsb;
597 unsigned int iosize;
598 xfs_fileoff_t ioalign;
599 int n;
600 xfs_fileoff_t start_fsb;
601
602 /*
603 * If there are any real blocks past eof, then don't
604 * do any speculative allocation.
605 */
606 start_fsb = XFS_B_TO_FSBT(mp,
607 ((xfs_ufsize_t)(offset + count - 1)));
608 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
609 while (count_fsb > 0) {
610 nimaps = XFS_WRITE_IMAPS;
611 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
612 0, &firstblock, 0, imap, &nimaps, NULL);
613 if (error) {
614 return error;
615 }
616 for (n = 0; n < nimaps; n++) {
617 if ( !(io->io_flags & XFS_IOCORE_RT) &&
618 !imap[n].br_startblock) {
619 cmn_err(CE_PANIC,"Access to block "
620 "zero: fs <%s> inode: %lld "
621 "start_block : %llx start_off "
622 ": %llx blkcnt : %llx "
623 "extent-state : %x \n",
624 (ip->i_mount)->m_fsname,
625 (long long)ip->i_ino,
626 imap[n].br_startblock,
627 imap[n].br_startoff,
628 imap[n].br_blockcount,
629 imap[n].br_state);
630 }
631 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
632 (imap[n].br_startblock != DELAYSTARTBLOCK)) {
633 goto write_map;
634 }
635 start_fsb += imap[n].br_blockcount;
636 count_fsb -= imap[n].br_blockcount;
637 }
638 }
639 iosize = mp->m_writeio_blocks;
640 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
641 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
642 last_fsb = ioalign + iosize;
643 aeof = 1;
644 }
645 write_map:
646 nimaps = XFS_WRITE_IMAPS;
647 firstblock = NULLFSBLOCK;
648
649 /*
650 * If mounted with the "-o swalloc" option, roundup the allocation
651 * request to a stripe width boundary if the file size is >=
652 * stripe width and we are allocating past the allocation eof.
653 */
654 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth
655 && (mp->m_flags & XFS_MOUNT_SWALLOC)
656 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
657 int eof;
658 xfs_fileoff_t new_last_fsb;
659
660 new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
661 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
662 if (error) {
663 return error;
664 }
665 if (eof) {
666 last_fsb = new_last_fsb;
667 }
668 /*
669 * Roundup the allocation request to a stripe unit (m_dalign) boundary
670 * if the file size is >= stripe unit size, and we are allocating past
671 * the allocation eof.
672 */
673 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
674 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
675 int eof;
676 xfs_fileoff_t new_last_fsb;
677 new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
678 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
679 if (error) {
680 return error;
681 }
682 if (eof) {
683 last_fsb = new_last_fsb;
684 }
685 /*
686 * Round up the allocation request to a real-time extent boundary
687 * if the file is on the real-time subvolume.
688 */
689 } else if (io->io_flags & XFS_IOCORE_RT && aeof) {
690 int eof;
691 xfs_fileoff_t new_last_fsb;
692
693 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
694 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
695 if (error) {
696 return error;
697 }
698 if (eof)
699 last_fsb = new_last_fsb;
700 }
701 error = xfs_bmapi(NULL, ip, offset_fsb,
702 (xfs_filblks_t)(last_fsb - offset_fsb),
703 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
704 XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
705 &nimaps, NULL);
706 /*
707 * This can be EDQUOT, if nimaps == 0
708 */
709 if (error && (error != ENOSPC)) {
710 return XFS_ERROR(error);
711 }
712 /*
713 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
714 * then we must have run out of space.
715 */
716 if (nimaps == 0) {
717 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
718 io, offset, count);
719 if (xfs_flush_space(ip, &fsynced, &ioflag))
720 return XFS_ERROR(ENOSPC);
721
722 error = 0;
723 goto retry;
724 }
725
726 *ret_imap = imap[0];
727 *nmaps = 1;
728 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
729 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
730 "start_block : %llx start_off : %llx blkcnt : %llx "
731 "extent-state : %x \n",
732 (ip->i_mount)->m_fsname,
733 (long long)ip->i_ino,
734 ret_imap->br_startblock, ret_imap->br_startoff,
735 ret_imap->br_blockcount,ret_imap->br_state);
736 }
737 return 0;
738 }
739
740 /*
741 * Pass in a delayed allocate extent, convert it to real extents;
742 * return to the caller the extent we create which maps on top of
743 * the originating callers request.
744 *
745 * Called without a lock on the inode.
746 */
747 int
748 xfs_iomap_write_allocate(
749 xfs_inode_t *ip,
750 xfs_off_t offset,
751 size_t count,
752 xfs_bmbt_irec_t *map,
753 int *retmap)
754 {
755 xfs_mount_t *mp = ip->i_mount;
756 xfs_iocore_t *io = &ip->i_iocore;
757 xfs_fileoff_t offset_fsb, last_block;
758 xfs_fileoff_t end_fsb, map_start_fsb;
759 xfs_fsblock_t first_block;
760 xfs_bmap_free_t free_list;
761 xfs_filblks_t count_fsb;
762 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
763 xfs_trans_t *tp;
764 int i, nimaps, committed;
765 int error = 0;
766 int nres;
767
768 *retmap = 0;
769
770 /*
771 * Make sure that the dquots are there.
772 */
773 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
774 return XFS_ERROR(error);
775
776 offset_fsb = XFS_B_TO_FSBT(mp, offset);
777 count_fsb = map->br_blockcount;
778 map_start_fsb = map->br_startoff;
779
780 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
781
782 while (count_fsb != 0) {
783 /*
784 * Set up a transaction with which to allocate the
785 * backing store for the file. Do allocations in a
786 * loop until we get some space in the range we are
787 * interested in. The other space that might be allocated
788 * is in the delayed allocation extent on which we sit
789 * but before our buffer starts.
790 */
791
792 nimaps = 0;
793 while (nimaps == 0) {
794 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
795 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
796 error = xfs_trans_reserve(tp, nres,
797 XFS_WRITE_LOG_RES(mp),
798 0, XFS_TRANS_PERM_LOG_RES,
799 XFS_WRITE_LOG_COUNT);
800 if (error == ENOSPC) {
801 error = xfs_trans_reserve(tp, 0,
802 XFS_WRITE_LOG_RES(mp),
803 0,
804 XFS_TRANS_PERM_LOG_RES,
805 XFS_WRITE_LOG_COUNT);
806 }
807 if (error) {
808 xfs_trans_cancel(tp, 0);
809 return XFS_ERROR(error);
810 }
811 xfs_ilock(ip, XFS_ILOCK_EXCL);
812 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
813 xfs_trans_ihold(tp, ip);
814
815 XFS_BMAP_INIT(&free_list, &first_block);
816
817 nimaps = XFS_STRAT_WRITE_IMAPS;
818 /*
819 * Ensure we don't go beyond eof - it is possible
820 * the extents changed since we did the read call,
821 * we dropped the ilock in the interim.
822 */
823
824 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size);
825 xfs_bmap_last_offset(NULL, ip, &last_block,
826 XFS_DATA_FORK);
827 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
828 if ((map_start_fsb + count_fsb) > last_block) {
829 count_fsb = last_block - map_start_fsb;
830 if (count_fsb == 0) {
831 error = EAGAIN;
832 goto trans_cancel;
833 }
834 }
835
836 /* Go get the actual blocks */
837 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
838 XFS_BMAPI_WRITE, &first_block, 1,
839 imap, &nimaps, &free_list);
840 if (error)
841 goto trans_cancel;
842
843 error = xfs_bmap_finish(&tp, &free_list,
844 first_block, &committed);
845 if (error)
846 goto trans_cancel;
847
848 error = xfs_trans_commit(tp,
849 XFS_TRANS_RELEASE_LOG_RES, NULL);
850 if (error)
851 goto error0;
852
853 xfs_iunlock(ip, XFS_ILOCK_EXCL);
854 }
855
856 /*
857 * See if we were able to allocate an extent that
858 * covers at least part of the callers request
859 */
860
861 for (i = 0; i < nimaps; i++) {
862 if ( !(io->io_flags & XFS_IOCORE_RT) &&
863 !imap[i].br_startblock) {
864 cmn_err(CE_PANIC,"Access to block zero: "
865 "fs <%s> inode: %lld "
866 "start_block : %llx start_off : %llx "
867 "blkcnt : %llx extent-state : %x \n",
868 (ip->i_mount)->m_fsname,
869 (long long)ip->i_ino,
870 imap[i].br_startblock,
871 imap[i].br_startoff,
872 imap[i].br_blockcount,imap[i].br_state);
873 }
874 if ((offset_fsb >= imap[i].br_startoff) &&
875 (offset_fsb < (imap[i].br_startoff +
876 imap[i].br_blockcount))) {
877 *map = imap[i];
878 *retmap = 1;
879 XFS_STATS_INC(xs_xstrat_quick);
880 return 0;
881 }
882 count_fsb -= imap[i].br_blockcount;
883 }
884
885 /* So far we have not mapped the requested part of the
886 * file, just surrounding data, try again.
887 */
888 nimaps--;
889 map_start_fsb = imap[nimaps].br_startoff +
890 imap[nimaps].br_blockcount;
891 }
892
893 trans_cancel:
894 xfs_bmap_cancel(&free_list);
895 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
896 error0:
897 xfs_iunlock(ip, XFS_ILOCK_EXCL);
898 return XFS_ERROR(error);
899 }
900
901 int
902 xfs_iomap_write_unwritten(
903 xfs_inode_t *ip,
904 xfs_off_t offset,
905 size_t count)
906 {
907 xfs_mount_t *mp = ip->i_mount;
908 xfs_iocore_t *io = &ip->i_iocore;
909 xfs_trans_t *tp;
910 xfs_fileoff_t offset_fsb;
911 xfs_filblks_t count_fsb;
912 xfs_filblks_t numblks_fsb;
913 xfs_bmbt_irec_t imap;
914 int committed;
915 int error;
916 int nres;
917 int nimaps;
918 xfs_fsblock_t firstfsb;
919 xfs_bmap_free_t free_list;
920
921 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
922 &ip->i_iocore, offset, count);
923
924 offset_fsb = XFS_B_TO_FSBT(mp, offset);
925 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
926 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
927
928 do {
929 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
930
931 /*
932 * set up a transaction to convert the range of extents
933 * from unwritten to real. Do allocations in a loop until
934 * we have covered the range passed in.
935 */
936
937 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
938 error = xfs_trans_reserve(tp, nres,
939 XFS_WRITE_LOG_RES(mp), 0,
940 XFS_TRANS_PERM_LOG_RES,
941 XFS_WRITE_LOG_COUNT);
942 if (error) {
943 xfs_trans_cancel(tp, 0);
944 goto error0;
945 }
946
947 xfs_ilock(ip, XFS_ILOCK_EXCL);
948 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
949 xfs_trans_ihold(tp, ip);
950
951 /*
952 * Modify the unwritten extent state of the buffer.
953 */
954 XFS_BMAP_INIT(&free_list, &firstfsb);
955 nimaps = 1;
956 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
957 XFS_BMAPI_WRITE, &firstfsb,
958 1, &imap, &nimaps, &free_list);
959 if (error)
960 goto error_on_bmapi_transaction;
961
962 error = xfs_bmap_finish(&(tp), &(free_list),
963 firstfsb, &committed);
964 if (error)
965 goto error_on_bmapi_transaction;
966
967 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
968 xfs_iunlock(ip, XFS_ILOCK_EXCL);
969 if (error)
970 goto error0;
971
972 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) {
973 cmn_err(CE_PANIC,"Access to block zero: fs <%s> "
974 "inode: %lld start_block : %llx start_off : "
975 "%llx blkcnt : %llx extent-state : %x \n",
976 (ip->i_mount)->m_fsname,
977 (long long)ip->i_ino,
978 imap.br_startblock,imap.br_startoff,
979 imap.br_blockcount,imap.br_state);
980 }
981
982 if ((numblks_fsb = imap.br_blockcount) == 0) {
983 /*
984 * The numblks_fsb value should always get
985 * smaller, otherwise the loop is stuck.
986 */
987 ASSERT(imap.br_blockcount);
988 break;
989 }
990 offset_fsb += numblks_fsb;
991 count_fsb -= numblks_fsb;
992 } while (count_fsb > 0);
993
994 return 0;
995
996 error_on_bmapi_transaction:
997 xfs_bmap_cancel(&free_list);
998 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
999 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1000 error0:
1001 return XFS_ERROR(error);
1002 }
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