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[PATCH] v9fs: VFS superblock operations and glue
[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 break;
230 case BMAPI_WRITE:
231 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);
232 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;
233 if (flags & BMAPI_IGNSTATE)
234 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE;
235 XFS_ILOCK(mp, io, lockmode);
236 break;
237 case BMAPI_ALLOCATE:
238 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count);
239 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD;
240 bmapi_flags = XFS_BMAPI_ENTIRE;
241 /* Attempt non-blocking lock */
242 if (flags & BMAPI_TRYLOCK) {
243 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode))
244 return XFS_ERROR(EAGAIN);
245 } else {
246 XFS_ILOCK(mp, io, lockmode);
247 }
248 break;
249 case BMAPI_UNWRITTEN:
250 goto phase2;
251 case BMAPI_DEVICE:
252 lockmode = XFS_LCK_MAP_SHARED(mp, io);
253 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ?
254 mp->m_rtdev_targp : mp->m_ddev_targp;
255 error = 0;
256 *niomaps = 1;
257 goto out;
258 default:
259 BUG();
260 }
261
262 ASSERT(offset <= mp->m_maxioffset);
263 if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
264 count = mp->m_maxioffset - offset;
265 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
266 offset_fsb = XFS_B_TO_FSBT(mp, offset);
267
268 error = XFS_BMAPI(mp, NULL, io, offset_fsb,
269 (xfs_filblks_t)(end_fsb - offset_fsb),
270 bmapi_flags, NULL, 0, &imap,
271 &nimaps, NULL);
272
273 if (error)
274 goto out;
275
276 phase2:
277 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) {
278 case BMAPI_WRITE:
279 /* If we found an extent, return it */
280 if (nimaps &&
281 (imap.br_startblock != HOLESTARTBLOCK) &&
282 (imap.br_startblock != DELAYSTARTBLOCK)) {
283 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
284 offset, count, iomapp, &imap, flags);
285 break;
286 }
287
288 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
289 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,
290 count, flags, &imap, &nimaps, nimaps);
291 } else {
292 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,
293 flags, &imap, &nimaps);
294 }
295 if (!error) {
296 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,
297 offset, count, iomapp, &imap, flags);
298 }
299 iomap_flags = IOMAP_NEW;
300 break;
301 case BMAPI_ALLOCATE:
302 /* If we found an extent, return it */
303 XFS_IUNLOCK(mp, io, lockmode);
304 lockmode = 0;
305
306 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
307 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
308 offset, count, iomapp, &imap, flags);
309 break;
310 }
311
312 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count,
313 &imap, &nimaps);
314 break;
315 case BMAPI_UNWRITTEN:
316 lockmode = 0;
317 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
318 nimaps = 0;
319 break;
320 }
321
322 if (nimaps) {
323 *niomaps = xfs_imap_to_bmap(io, offset, &imap,
324 iomapp, nimaps, *niomaps, iomap_flags);
325 } else if (niomaps) {
326 *niomaps = 0;
327 }
328
329 out:
330 if (lockmode)
331 XFS_IUNLOCK(mp, io, lockmode);
332 return XFS_ERROR(error);
333 }
334
335 STATIC int
336 xfs_flush_space(
337 xfs_inode_t *ip,
338 int *fsynced,
339 int *ioflags)
340 {
341 switch (*fsynced) {
342 case 0:
343 if (ip->i_delayed_blks) {
344 xfs_iunlock(ip, XFS_ILOCK_EXCL);
345 xfs_flush_inode(ip);
346 xfs_ilock(ip, XFS_ILOCK_EXCL);
347 *fsynced = 1;
348 } else {
349 *ioflags |= BMAPI_SYNC;
350 *fsynced = 2;
351 }
352 return 0;
353 case 1:
354 *fsynced = 2;
355 *ioflags |= BMAPI_SYNC;
356 return 0;
357 case 2:
358 xfs_iunlock(ip, XFS_ILOCK_EXCL);
359 xfs_flush_device(ip);
360 xfs_ilock(ip, XFS_ILOCK_EXCL);
361 *fsynced = 3;
362 return 0;
363 }
364 return 1;
365 }
366
367 int
368 xfs_iomap_write_direct(
369 xfs_inode_t *ip,
370 xfs_off_t offset,
371 size_t count,
372 int flags,
373 xfs_bmbt_irec_t *ret_imap,
374 int *nmaps,
375 int found)
376 {
377 xfs_mount_t *mp = ip->i_mount;
378 xfs_iocore_t *io = &ip->i_iocore;
379 xfs_fileoff_t offset_fsb;
380 xfs_fileoff_t last_fsb;
381 xfs_filblks_t count_fsb;
382 xfs_fsize_t isize;
383 xfs_fsblock_t firstfsb;
384 int nimaps, maps;
385 int error;
386 int bmapi_flag;
387 int quota_flag;
388 int rt;
389 xfs_trans_t *tp;
390 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp;
391 xfs_bmap_free_t free_list;
392 int aeof;
393 xfs_filblks_t qblocks, resblks;
394 int committed;
395 int resrtextents;
396
397 /*
398 * Make sure that the dquots are there. This doesn't hold
399 * the ilock across a disk read.
400 */
401 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
402 if (error)
403 return XFS_ERROR(error);
404
405 maps = min(XFS_WRITE_IMAPS, *nmaps);
406 nimaps = maps;
407
408 isize = ip->i_d.di_size;
409 aeof = (offset + count) > isize;
410
411 if (io->io_new_size > isize)
412 isize = io->io_new_size;
413
414 offset_fsb = XFS_B_TO_FSBT(mp, offset);
415 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
416 count_fsb = last_fsb - offset_fsb;
417 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {
418 xfs_fileoff_t map_last_fsb;
419
420 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;
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 the data or realtime partition.
430 */
431 if ((rt = XFS_IS_REALTIME_INODE(ip))) {
432 xfs_extlen_t extsz;
433
434 if (!(extsz = ip->i_d.di_extsize))
435 extsz = mp->m_sb.sb_rextsize;
436 resrtextents = qblocks = (count_fsb + extsz - 1);
437 do_div(resrtextents, mp->m_sb.sb_rextsize);
438 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
439 quota_flag = XFS_QMOPT_RES_RTBLKS;
440 } else {
441 resrtextents = 0;
442 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, count_fsb);
443 quota_flag = XFS_QMOPT_RES_REGBLKS;
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 error = xfs_trans_reserve(tp, resblks,
452 XFS_WRITE_LOG_RES(mp), resrtextents,
453 XFS_TRANS_PERM_LOG_RES,
454 XFS_WRITE_LOG_COUNT);
455
456 /*
457 * Check for running out of space, note: need lock to return
458 */
459 if (error)
460 xfs_trans_cancel(tp, 0);
461 xfs_ilock(ip, XFS_ILOCK_EXCL);
462 if (error)
463 goto error_out;
464
465 if (XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag)) {
466 error = (EDQUOT);
467 goto error1;
468 }
469
470 bmapi_flag = XFS_BMAPI_WRITE;
471 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
472 xfs_trans_ihold(tp, ip);
473
474 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))
475 bmapi_flag |= XFS_BMAPI_PREALLOC;
476
477 /*
478 * Issue the bmapi() call to allocate the blocks
479 */
480 XFS_BMAP_INIT(&free_list, &firstfsb);
481 nimaps = 1;
482 imapp = &imap[0];
483 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
484 bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list);
485 if (error)
486 goto error0;
487
488 /*
489 * Complete the transaction
490 */
491 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
492 if (error)
493 goto error0;
494 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
495 if (error)
496 goto error_out;
497
498 /*
499 * Copy any maps to caller's array and return any error.
500 */
501 if (nimaps == 0) {
502 error = (ENOSPC);
503 goto error_out;
504 }
505
506 *ret_imap = imap[0];
507 *nmaps = 1;
508 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
509 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
510 "start_block : %llx start_off : %llx blkcnt : %llx "
511 "extent-state : %x \n",
512 (ip->i_mount)->m_fsname,
513 (long long)ip->i_ino,
514 ret_imap->br_startblock, ret_imap->br_startoff,
515 ret_imap->br_blockcount,ret_imap->br_state);
516 }
517 return 0;
518
519 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
520 xfs_bmap_cancel(&free_list);
521 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
522
523 error1: /* Just cancel transaction */
524 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
525 *nmaps = 0; /* nothing set-up here */
526
527 error_out:
528 return XFS_ERROR(error);
529 }
530
531 int
532 xfs_iomap_write_delay(
533 xfs_inode_t *ip,
534 xfs_off_t offset,
535 size_t count,
536 int ioflag,
537 xfs_bmbt_irec_t *ret_imap,
538 int *nmaps)
539 {
540 xfs_mount_t *mp = ip->i_mount;
541 xfs_iocore_t *io = &ip->i_iocore;
542 xfs_fileoff_t offset_fsb;
543 xfs_fileoff_t last_fsb;
544 xfs_fsize_t isize;
545 xfs_fsblock_t firstblock;
546 int nimaps;
547 int error;
548 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
549 int aeof;
550 int fsynced = 0;
551
552 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
553
554 /*
555 * Make sure that the dquots are there. This doesn't hold
556 * the ilock across a disk read.
557 */
558
559 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
560 if (error)
561 return XFS_ERROR(error);
562
563 retry:
564 isize = ip->i_d.di_size;
565 if (io->io_new_size > isize) {
566 isize = io->io_new_size;
567 }
568
569 aeof = 0;
570 offset_fsb = XFS_B_TO_FSBT(mp, offset);
571 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
572 /*
573 * If the caller is doing a write at the end of the file,
574 * then extend the allocation (and the buffer used for the write)
575 * out to the file system's write iosize. We clean up any extra
576 * space left over when the file is closed in xfs_inactive().
577 *
578 * For sync writes, we are flushing delayed allocate space to
579 * try to make additional space available for allocation near
580 * the filesystem full boundary - preallocation hurts in that
581 * situation, of course.
582 */
583 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
584 xfs_off_t aligned_offset;
585 xfs_filblks_t count_fsb;
586 unsigned int iosize;
587 xfs_fileoff_t ioalign;
588 int n;
589 xfs_fileoff_t start_fsb;
590
591 /*
592 * If there are any real blocks past eof, then don't
593 * do any speculative allocation.
594 */
595 start_fsb = XFS_B_TO_FSBT(mp,
596 ((xfs_ufsize_t)(offset + count - 1)));
597 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
598 while (count_fsb > 0) {
599 nimaps = XFS_WRITE_IMAPS;
600 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
601 0, &firstblock, 0, imap, &nimaps, NULL);
602 if (error) {
603 return error;
604 }
605 for (n = 0; n < nimaps; n++) {
606 if ( !(io->io_flags & XFS_IOCORE_RT) &&
607 !imap[n].br_startblock) {
608 cmn_err(CE_PANIC,"Access to block "
609 "zero: fs <%s> inode: %lld "
610 "start_block : %llx start_off "
611 ": %llx blkcnt : %llx "
612 "extent-state : %x \n",
613 (ip->i_mount)->m_fsname,
614 (long long)ip->i_ino,
615 imap[n].br_startblock,
616 imap[n].br_startoff,
617 imap[n].br_blockcount,
618 imap[n].br_state);
619 }
620 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
621 (imap[n].br_startblock != DELAYSTARTBLOCK)) {
622 goto write_map;
623 }
624 start_fsb += imap[n].br_blockcount;
625 count_fsb -= imap[n].br_blockcount;
626 }
627 }
628 iosize = mp->m_writeio_blocks;
629 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
630 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
631 last_fsb = ioalign + iosize;
632 aeof = 1;
633 }
634 write_map:
635 nimaps = XFS_WRITE_IMAPS;
636 firstblock = NULLFSBLOCK;
637
638 /*
639 * If mounted with the "-o swalloc" option, roundup the allocation
640 * request to a stripe width boundary if the file size is >=
641 * stripe width and we are allocating past the allocation eof.
642 */
643 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth
644 && (mp->m_flags & XFS_MOUNT_SWALLOC)
645 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
646 int eof;
647 xfs_fileoff_t new_last_fsb;
648
649 new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
650 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
651 if (error) {
652 return error;
653 }
654 if (eof) {
655 last_fsb = new_last_fsb;
656 }
657 /*
658 * Roundup the allocation request to a stripe unit (m_dalign) boundary
659 * if the file size is >= stripe unit size, and we are allocating past
660 * the allocation eof.
661 */
662 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
663 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
664 int eof;
665 xfs_fileoff_t new_last_fsb;
666 new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
667 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
668 if (error) {
669 return error;
670 }
671 if (eof) {
672 last_fsb = new_last_fsb;
673 }
674 /*
675 * Round up the allocation request to a real-time extent boundary
676 * if the file is on the real-time subvolume.
677 */
678 } else if (io->io_flags & XFS_IOCORE_RT && aeof) {
679 int eof;
680 xfs_fileoff_t new_last_fsb;
681
682 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
683 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
684 if (error) {
685 return error;
686 }
687 if (eof)
688 last_fsb = new_last_fsb;
689 }
690 error = xfs_bmapi(NULL, ip, offset_fsb,
691 (xfs_filblks_t)(last_fsb - offset_fsb),
692 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
693 XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
694 &nimaps, NULL);
695 /*
696 * This can be EDQUOT, if nimaps == 0
697 */
698 if (error && (error != ENOSPC)) {
699 return XFS_ERROR(error);
700 }
701 /*
702 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
703 * then we must have run out of space.
704 */
705 if (nimaps == 0) {
706 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
707 io, offset, count);
708 if (xfs_flush_space(ip, &fsynced, &ioflag))
709 return XFS_ERROR(ENOSPC);
710
711 error = 0;
712 goto retry;
713 }
714
715 *ret_imap = imap[0];
716 *nmaps = 1;
717 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
718 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
719 "start_block : %llx start_off : %llx blkcnt : %llx "
720 "extent-state : %x \n",
721 (ip->i_mount)->m_fsname,
722 (long long)ip->i_ino,
723 ret_imap->br_startblock, ret_imap->br_startoff,
724 ret_imap->br_blockcount,ret_imap->br_state);
725 }
726 return 0;
727 }
728
729 /*
730 * Pass in a delayed allocate extent, convert it to real extents;
731 * return to the caller the extent we create which maps on top of
732 * the originating callers request.
733 *
734 * Called without a lock on the inode.
735 */
736 int
737 xfs_iomap_write_allocate(
738 xfs_inode_t *ip,
739 xfs_off_t offset,
740 size_t count,
741 xfs_bmbt_irec_t *map,
742 int *retmap)
743 {
744 xfs_mount_t *mp = ip->i_mount;
745 xfs_iocore_t *io = &ip->i_iocore;
746 xfs_fileoff_t offset_fsb, last_block;
747 xfs_fileoff_t end_fsb, map_start_fsb;
748 xfs_fsblock_t first_block;
749 xfs_bmap_free_t free_list;
750 xfs_filblks_t count_fsb;
751 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
752 xfs_trans_t *tp;
753 int i, nimaps, committed;
754 int error = 0;
755 int nres;
756
757 *retmap = 0;
758
759 /*
760 * Make sure that the dquots are there.
761 */
762 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
763 return XFS_ERROR(error);
764
765 offset_fsb = XFS_B_TO_FSBT(mp, offset);
766 count_fsb = map->br_blockcount;
767 map_start_fsb = map->br_startoff;
768
769 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
770
771 while (count_fsb != 0) {
772 /*
773 * Set up a transaction with which to allocate the
774 * backing store for the file. Do allocations in a
775 * loop until we get some space in the range we are
776 * interested in. The other space that might be allocated
777 * is in the delayed allocation extent on which we sit
778 * but before our buffer starts.
779 */
780
781 nimaps = 0;
782 while (nimaps == 0) {
783 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
784 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
785 error = xfs_trans_reserve(tp, nres,
786 XFS_WRITE_LOG_RES(mp),
787 0, XFS_TRANS_PERM_LOG_RES,
788 XFS_WRITE_LOG_COUNT);
789 if (error == ENOSPC) {
790 error = xfs_trans_reserve(tp, 0,
791 XFS_WRITE_LOG_RES(mp),
792 0,
793 XFS_TRANS_PERM_LOG_RES,
794 XFS_WRITE_LOG_COUNT);
795 }
796 if (error) {
797 xfs_trans_cancel(tp, 0);
798 return XFS_ERROR(error);
799 }
800 xfs_ilock(ip, XFS_ILOCK_EXCL);
801 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
802 xfs_trans_ihold(tp, ip);
803
804 XFS_BMAP_INIT(&free_list, &first_block);
805
806 nimaps = XFS_STRAT_WRITE_IMAPS;
807 /*
808 * Ensure we don't go beyond eof - it is possible
809 * the extents changed since we did the read call,
810 * we dropped the ilock in the interim.
811 */
812
813 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size);
814 xfs_bmap_last_offset(NULL, ip, &last_block,
815 XFS_DATA_FORK);
816 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
817 if ((map_start_fsb + count_fsb) > last_block) {
818 count_fsb = last_block - map_start_fsb;
819 if (count_fsb == 0) {
820 error = EAGAIN;
821 goto trans_cancel;
822 }
823 }
824
825 /* Go get the actual blocks */
826 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
827 XFS_BMAPI_WRITE, &first_block, 1,
828 imap, &nimaps, &free_list);
829 if (error)
830 goto trans_cancel;
831
832 error = xfs_bmap_finish(&tp, &free_list,
833 first_block, &committed);
834 if (error)
835 goto trans_cancel;
836
837 error = xfs_trans_commit(tp,
838 XFS_TRANS_RELEASE_LOG_RES, NULL);
839 if (error)
840 goto error0;
841
842 xfs_iunlock(ip, XFS_ILOCK_EXCL);
843 }
844
845 /*
846 * See if we were able to allocate an extent that
847 * covers at least part of the callers request
848 */
849
850 for (i = 0; i < nimaps; i++) {
851 if ( !(io->io_flags & XFS_IOCORE_RT) &&
852 !imap[i].br_startblock) {
853 cmn_err(CE_PANIC,"Access to block zero: "
854 "fs <%s> inode: %lld "
855 "start_block : %llx start_off : %llx "
856 "blkcnt : %llx extent-state : %x \n",
857 (ip->i_mount)->m_fsname,
858 (long long)ip->i_ino,
859 imap[i].br_startblock,
860 imap[i].br_startoff,
861 imap[i].br_blockcount,imap[i].br_state);
862 }
863 if ((offset_fsb >= imap[i].br_startoff) &&
864 (offset_fsb < (imap[i].br_startoff +
865 imap[i].br_blockcount))) {
866 *map = imap[i];
867 *retmap = 1;
868 XFS_STATS_INC(xs_xstrat_quick);
869 return 0;
870 }
871 count_fsb -= imap[i].br_blockcount;
872 }
873
874 /* So far we have not mapped the requested part of the
875 * file, just surrounding data, try again.
876 */
877 nimaps--;
878 map_start_fsb = imap[nimaps].br_startoff +
879 imap[nimaps].br_blockcount;
880 }
881
882 trans_cancel:
883 xfs_bmap_cancel(&free_list);
884 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
885 error0:
886 xfs_iunlock(ip, XFS_ILOCK_EXCL);
887 return XFS_ERROR(error);
888 }
889
890 int
891 xfs_iomap_write_unwritten(
892 xfs_inode_t *ip,
893 xfs_off_t offset,
894 size_t count)
895 {
896 xfs_mount_t *mp = ip->i_mount;
897 xfs_iocore_t *io = &ip->i_iocore;
898 xfs_trans_t *tp;
899 xfs_fileoff_t offset_fsb;
900 xfs_filblks_t count_fsb;
901 xfs_filblks_t numblks_fsb;
902 xfs_bmbt_irec_t imap;
903 int committed;
904 int error;
905 int nres;
906 int nimaps;
907 xfs_fsblock_t firstfsb;
908 xfs_bmap_free_t free_list;
909
910 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
911 &ip->i_iocore, offset, count);
912
913 offset_fsb = XFS_B_TO_FSBT(mp, offset);
914 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
915 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
916
917 do {
918 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
919
920 /*
921 * set up a transaction to convert the range of extents
922 * from unwritten to real. Do allocations in a loop until
923 * we have covered the range passed in.
924 */
925
926 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
927 error = xfs_trans_reserve(tp, nres,
928 XFS_WRITE_LOG_RES(mp), 0,
929 XFS_TRANS_PERM_LOG_RES,
930 XFS_WRITE_LOG_COUNT);
931 if (error) {
932 xfs_trans_cancel(tp, 0);
933 goto error0;
934 }
935
936 xfs_ilock(ip, XFS_ILOCK_EXCL);
937 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
938 xfs_trans_ihold(tp, ip);
939
940 /*
941 * Modify the unwritten extent state of the buffer.
942 */
943 XFS_BMAP_INIT(&free_list, &firstfsb);
944 nimaps = 1;
945 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
946 XFS_BMAPI_WRITE, &firstfsb,
947 1, &imap, &nimaps, &free_list);
948 if (error)
949 goto error_on_bmapi_transaction;
950
951 error = xfs_bmap_finish(&(tp), &(free_list),
952 firstfsb, &committed);
953 if (error)
954 goto error_on_bmapi_transaction;
955
956 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
957 xfs_iunlock(ip, XFS_ILOCK_EXCL);
958 if (error)
959 goto error0;
960
961 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) {
962 cmn_err(CE_PANIC,"Access to block zero: fs <%s> "
963 "inode: %lld start_block : %llx start_off : "
964 "%llx blkcnt : %llx extent-state : %x \n",
965 (ip->i_mount)->m_fsname,
966 (long long)ip->i_ino,
967 imap.br_startblock,imap.br_startoff,
968 imap.br_blockcount,imap.br_state);
969 }
970
971 if ((numblks_fsb = imap.br_blockcount) == 0) {
972 /*
973 * The numblks_fsb value should always get
974 * smaller, otherwise the loop is stuck.
975 */
976 ASSERT(imap.br_blockcount);
977 break;
978 }
979 offset_fsb += numblks_fsb;
980 count_fsb -= numblks_fsb;
981 } while (count_fsb > 0);
982
983 return 0;
984
985 error_on_bmapi_transaction:
986 xfs_bmap_cancel(&free_list);
987 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
988 xfs_iunlock(ip, XFS_ILOCK_EXCL);
989 error0:
990 return XFS_ERROR(error);
991 }
Linux kernel - Deliverables
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