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V4L/DVB: Complete rewrite of the DiB3000mc-driver
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / xfs / xfs_iomap.c
blobf1949c16df154157bbdada2882d2656ab918311f
1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_bit.h"
21 #include "xfs_log.h"
22 #include "xfs_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_dir2.h"
27 #include "xfs_alloc.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_quota.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
38 #include "xfs_ialloc.h"
39 #include "xfs_btree.h"
40 #include "xfs_bmap.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_itable.h"
44 #include "xfs_rw.h"
45 #include "xfs_acl.h"
46 #include "xfs_cap.h"
47 #include "xfs_mac.h"
48 #include "xfs_attr.h"
49 #include "xfs_buf_item.h"
50 #include "xfs_trans_space.h"
51 #include "xfs_utils.h"
52 #include "xfs_iomap.h"
53
54 #if defined(XFS_RW_TRACE)
55 void
56 xfs_iomap_enter_trace(
57 int tag,
58 xfs_iocore_t *io,
59 xfs_off_t offset,
60 ssize_t count)
61 {
62 xfs_inode_t *ip = XFS_IO_INODE(io);
63
64 if (!ip->i_rwtrace)
65 return;
66
67 ktrace_enter(ip->i_rwtrace,
68 (void *)((unsigned long)tag),
69 (void *)ip,
70 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
71 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
72 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
73 (void *)((unsigned long)(offset & 0xffffffff)),
74 (void *)((unsigned long)count),
75 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)),
76 (void *)((unsigned long)(io->io_new_size & 0xffffffff)),
77 (void *)((unsigned long)current_pid()),
78 (void *)NULL,
79 (void *)NULL,
80 (void *)NULL,
81 (void *)NULL,
82 (void *)NULL,
83 (void *)NULL);
84 }
85
86 void
87 xfs_iomap_map_trace(
88 int tag,
89 xfs_iocore_t *io,
90 xfs_off_t offset,
91 ssize_t count,
92 xfs_iomap_t *iomapp,
93 xfs_bmbt_irec_t *imapp,
94 int flags)
95 {
96 xfs_inode_t *ip = XFS_IO_INODE(io);
97
98 if (!ip->i_rwtrace)
99 return;
100
101 ktrace_enter(ip->i_rwtrace,
102 (void *)((unsigned long)tag),
103 (void *)ip,
104 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
105 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
106 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
107 (void *)((unsigned long)(offset & 0xffffffff)),
108 (void *)((unsigned long)count),
109 (void *)((unsigned long)flags),
110 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),
111 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),
112 (void *)((unsigned long)(iomapp->iomap_delta)),
113 (void *)((unsigned long)(iomapp->iomap_bsize)),
114 (void *)((unsigned long)(iomapp->iomap_bn)),
115 (void *)(__psint_t)(imapp->br_startoff),
116 (void *)((unsigned long)(imapp->br_blockcount)),
117 (void *)(__psint_t)(imapp->br_startblock));
118 }
119 #else
120 #define xfs_iomap_enter_trace(tag, io, offset, count)
121 #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)
122 #endif
123
124 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
125 << mp->m_writeio_log)
126 #define XFS_STRAT_WRITE_IMAPS 2
127 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
128
129 STATIC int
130 xfs_imap_to_bmap(
131 xfs_iocore_t *io,
132 xfs_off_t offset,
133 xfs_bmbt_irec_t *imap,
134 xfs_iomap_t *iomapp,
135 int imaps, /* Number of imap entries */
136 int iomaps, /* Number of iomap entries */
137 int flags)
138 {
139 xfs_mount_t *mp;
140 xfs_fsize_t nisize;
141 int pbm;
142 xfs_fsblock_t start_block;
143
144 mp = io->io_mount;
145 nisize = XFS_SIZE(mp, io);
146 if (io->io_new_size > nisize)
147 nisize = io->io_new_size;
148
149 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {
150 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);
151 iomapp->iomap_delta = offset - iomapp->iomap_offset;
152 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
153 iomapp->iomap_flags = flags;
154
155 if (io->io_flags & XFS_IOCORE_RT) {
156 iomapp->iomap_flags |= IOMAP_REALTIME;
157 iomapp->iomap_target = mp->m_rtdev_targp;
158 } else {
159 iomapp->iomap_target = mp->m_ddev_targp;
160 }
161 start_block = imap->br_startblock;
162 if (start_block == HOLESTARTBLOCK) {
163 iomapp->iomap_bn = IOMAP_DADDR_NULL;
164 iomapp->iomap_flags |= IOMAP_HOLE;
165 } else if (start_block == DELAYSTARTBLOCK) {
166 iomapp->iomap_bn = IOMAP_DADDR_NULL;
167 iomapp->iomap_flags |= IOMAP_DELAY;
168 } else {
169 iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block);
170 if (ISUNWRITTEN(imap))
171 iomapp->iomap_flags |= IOMAP_UNWRITTEN;
172 }
173
174 if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) {
175 iomapp->iomap_flags |= IOMAP_EOF;
176 }
177
178 offset += iomapp->iomap_bsize - iomapp->iomap_delta;
179 }
180 return pbm; /* Return the number filled */
181 }
182
183 int
184 xfs_iomap(
185 xfs_iocore_t *io,
186 xfs_off_t offset,
187 ssize_t count,
188 int flags,
189 xfs_iomap_t *iomapp,
190 int *niomaps)
191 {
192 xfs_mount_t *mp = io->io_mount;
193 xfs_fileoff_t offset_fsb, end_fsb;
194 int error = 0;
195 int lockmode = 0;
196 xfs_bmbt_irec_t imap;
197 int nimaps = 1;
198 int bmapi_flags = 0;
199 int iomap_flags = 0;
200
201 if (XFS_FORCED_SHUTDOWN(mp))
202 return XFS_ERROR(EIO);
203
204 switch (flags &
205 (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE |
206 BMAPI_UNWRITTEN | BMAPI_DEVICE)) {
207 case BMAPI_READ:
208 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count);
209 lockmode = XFS_LCK_MAP_SHARED(mp, io);
210 bmapi_flags = XFS_BMAPI_ENTIRE;
211 break;
212 case BMAPI_WRITE:
213 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);
214 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;
215 if (flags & BMAPI_IGNSTATE)
216 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE;
217 XFS_ILOCK(mp, io, lockmode);
218 break;
219 case BMAPI_ALLOCATE:
220 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count);
221 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD;
222 bmapi_flags = XFS_BMAPI_ENTIRE;
223 /* Attempt non-blocking lock */
224 if (flags & BMAPI_TRYLOCK) {
225 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode))
226 return XFS_ERROR(EAGAIN);
227 } else {
228 XFS_ILOCK(mp, io, lockmode);
229 }
230 break;
231 case BMAPI_UNWRITTEN:
232 goto phase2;
233 case BMAPI_DEVICE:
234 lockmode = XFS_LCK_MAP_SHARED(mp, io);
235 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ?
236 mp->m_rtdev_targp : mp->m_ddev_targp;
237 error = 0;
238 *niomaps = 1;
239 goto out;
240 default:
241 BUG();
242 }
243
244 ASSERT(offset <= mp->m_maxioffset);
245 if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
246 count = mp->m_maxioffset - offset;
247 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
248 offset_fsb = XFS_B_TO_FSBT(mp, offset);
249
250 error = XFS_BMAPI(mp, NULL, io, offset_fsb,
251 (xfs_filblks_t)(end_fsb - offset_fsb),
252 bmapi_flags, NULL, 0, &imap,
253 &nimaps, NULL, NULL);
254
255 if (error)
256 goto out;
257
258 phase2:
259 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) {
260 case BMAPI_WRITE:
261 /* If we found an extent, return it */
262 if (nimaps &&
263 (imap.br_startblock != HOLESTARTBLOCK) &&
264 (imap.br_startblock != DELAYSTARTBLOCK)) {
265 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
266 offset, count, iomapp, &imap, flags);
267 break;
268 }
269
270 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
271 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,
272 count, flags, &imap, &nimaps, nimaps);
273 } else {
274 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,
275 flags, &imap, &nimaps);
276 }
277 if (!error) {
278 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,
279 offset, count, iomapp, &imap, flags);
280 }
281 iomap_flags = IOMAP_NEW;
282 break;
283 case BMAPI_ALLOCATE:
284 /* If we found an extent, return it */
285 XFS_IUNLOCK(mp, io, lockmode);
286 lockmode = 0;
287
288 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
289 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
290 offset, count, iomapp, &imap, flags);
291 break;
292 }
293
294 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count,
295 &imap, &nimaps);
296 break;
297 case BMAPI_UNWRITTEN:
298 lockmode = 0;
299 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
300 nimaps = 0;
301 break;
302 }
303
304 if (nimaps) {
305 *niomaps = xfs_imap_to_bmap(io, offset, &imap,
306 iomapp, nimaps, *niomaps, iomap_flags);
307 } else if (niomaps) {
308 *niomaps = 0;
309 }
310
311 out:
312 if (lockmode)
313 XFS_IUNLOCK(mp, io, lockmode);
314 return XFS_ERROR(error);
315 }
316
317 STATIC int
318 xfs_iomap_eof_align_last_fsb(
319 xfs_mount_t *mp,
320 xfs_iocore_t *io,
321 xfs_fsize_t isize,
322 xfs_extlen_t extsize,
323 xfs_fileoff_t *last_fsb)
324 {
325 xfs_fileoff_t new_last_fsb = 0;
326 xfs_extlen_t align;
327 int eof, error;
328
329 if (io->io_flags & XFS_IOCORE_RT)
330 ;
331 /*
332 * If mounted with the "-o swalloc" option, roundup the allocation
333 * request to a stripe width boundary if the file size is >=
334 * stripe width and we are allocating past the allocation eof.
335 */
336 else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) &&
337 (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)))
338 new_last_fsb = roundup_64(*last_fsb, mp->m_swidth);
339 /*
340 * Roundup the allocation request to a stripe unit (m_dalign) boundary
341 * if the file size is >= stripe unit size, and we are allocating past
342 * the allocation eof.
343 */
344 else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)))
345 new_last_fsb = roundup_64(*last_fsb, mp->m_dalign);
346
347 /*
348 * Always round up the allocation request to an extent boundary
349 * (when file on a real-time subvolume or has di_extsize hint).
350 */
351 if (extsize) {
352 if (new_last_fsb)
353 align = roundup_64(new_last_fsb, extsize);
354 else
355 align = extsize;
356 new_last_fsb = roundup_64(*last_fsb, align);
357 }
358
359 if (new_last_fsb) {
360 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
361 if (error)
362 return error;
363 if (eof)
364 *last_fsb = new_last_fsb;
365 }
366 return 0;
367 }
368
369 STATIC int
370 xfs_flush_space(
371 xfs_inode_t *ip,
372 int *fsynced,
373 int *ioflags)
374 {
375 switch (*fsynced) {
376 case 0:
377 if (ip->i_delayed_blks) {
378 xfs_iunlock(ip, XFS_ILOCK_EXCL);
379 xfs_flush_inode(ip);
380 xfs_ilock(ip, XFS_ILOCK_EXCL);
381 *fsynced = 1;
382 } else {
383 *ioflags |= BMAPI_SYNC;
384 *fsynced = 2;
385 }
386 return 0;
387 case 1:
388 *fsynced = 2;
389 *ioflags |= BMAPI_SYNC;
390 return 0;
391 case 2:
392 xfs_iunlock(ip, XFS_ILOCK_EXCL);
393 xfs_flush_device(ip);
394 xfs_ilock(ip, XFS_ILOCK_EXCL);
395 *fsynced = 3;
396 return 0;
397 }
398 return 1;
399 }
400
401 int
402 xfs_iomap_write_direct(
403 xfs_inode_t *ip,
404 xfs_off_t offset,
405 size_t count,
406 int flags,
407 xfs_bmbt_irec_t *ret_imap,
408 int *nmaps,
409 int found)
410 {
411 xfs_mount_t *mp = ip->i_mount;
412 xfs_iocore_t *io = &ip->i_iocore;
413 xfs_fileoff_t offset_fsb;
414 xfs_fileoff_t last_fsb;
415 xfs_filblks_t count_fsb, resaligned;
416 xfs_fsblock_t firstfsb;
417 xfs_extlen_t extsz, temp;
418 xfs_fsize_t isize;
419 int nimaps;
420 int bmapi_flag;
421 int quota_flag;
422 int rt;
423 xfs_trans_t *tp;
424 xfs_bmbt_irec_t imap;
425 xfs_bmap_free_t free_list;
426 uint qblocks, resblks, resrtextents;
427 int committed;
428 int error;
429
430 /*
431 * Make sure that the dquots are there. This doesn't hold
432 * the ilock across a disk read.
433 */
434 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
435 if (error)
436 return XFS_ERROR(error);
437
438 rt = XFS_IS_REALTIME_INODE(ip);
439 if (unlikely(rt)) {
440 if (!(extsz = ip->i_d.di_extsize))
441 extsz = mp->m_sb.sb_rextsize;
442 } else {
443 extsz = ip->i_d.di_extsize;
444 }
445
446 isize = ip->i_d.di_size;
447 if (io->io_new_size > isize)
448 isize = io->io_new_size;
449
450 offset_fsb = XFS_B_TO_FSBT(mp, offset);
451 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
452 if ((offset + count) > isize) {
453 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz,
454 &last_fsb);
455 if (error)
456 goto error_out;
457 } else {
458 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK))
459 last_fsb = MIN(last_fsb, (xfs_fileoff_t)
460 ret_imap->br_blockcount +
461 ret_imap->br_startoff);
462 }
463 count_fsb = last_fsb - offset_fsb;
464 ASSERT(count_fsb > 0);
465
466 resaligned = count_fsb;
467 if (unlikely(extsz)) {
468 if ((temp = do_mod(offset_fsb, extsz)))
469 resaligned += temp;
470 if ((temp = do_mod(resaligned, extsz)))
471 resaligned += extsz - temp;
472 }
473
474 if (unlikely(rt)) {
475 resrtextents = qblocks = resaligned;
476 resrtextents /= mp->m_sb.sb_rextsize;
477 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
478 quota_flag = XFS_QMOPT_RES_RTBLKS;
479 } else {
480 resrtextents = 0;
481 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
482 quota_flag = XFS_QMOPT_RES_REGBLKS;
483 }
484
485 /*
486 * Allocate and setup the transaction
487 */
488 xfs_iunlock(ip, XFS_ILOCK_EXCL);
489 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
490 error = xfs_trans_reserve(tp, resblks,
491 XFS_WRITE_LOG_RES(mp), resrtextents,
492 XFS_TRANS_PERM_LOG_RES,
493 XFS_WRITE_LOG_COUNT);
494 /*
495 * Check for running out of space, note: need lock to return
496 */
497 if (error)
498 xfs_trans_cancel(tp, 0);
499 xfs_ilock(ip, XFS_ILOCK_EXCL);
500 if (error)
501 goto error_out;
502
503 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
504 qblocks, 0, quota_flag);
505 if (error)
506 goto error1;
507
508 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
509 xfs_trans_ihold(tp, ip);
510
511 bmapi_flag = XFS_BMAPI_WRITE;
512 if ((flags & BMAPI_DIRECT) && (offset < ip->i_d.di_size || extsz))
513 bmapi_flag |= XFS_BMAPI_PREALLOC;
514
515 /*
516 * Issue the xfs_bmapi() call to allocate the blocks
517 */
518 XFS_BMAP_INIT(&free_list, &firstfsb);
519 nimaps = 1;
520 error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb, bmapi_flag,
521 &firstfsb, 0, &imap, &nimaps, &free_list, NULL);
522 if (error)
523 goto error0;
524
525 /*
526 * Complete the transaction
527 */
528 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
529 if (error)
530 goto error0;
531 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
532 if (error)
533 goto error_out;
534
535 /*
536 * Copy any maps to caller's array and return any error.
537 */
538 if (nimaps == 0) {
539 error = (ENOSPC);
540 goto error_out;
541 }
542
543 *ret_imap = imap;
544 *nmaps = 1;
545 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
546 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
547 "start_block : %llx start_off : %llx blkcnt : %llx "
548 "extent-state : %x \n",
549 (ip->i_mount)->m_fsname,
550 (long long)ip->i_ino,
551 (unsigned long long)ret_imap->br_startblock,
552 (unsigned long long)ret_imap->br_startoff,
553 (unsigned long long)ret_imap->br_blockcount,
554 ret_imap->br_state);
555 }
556 return 0;
557
558 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
559 xfs_bmap_cancel(&free_list);
560 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
561
562 error1: /* Just cancel transaction */
563 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
564 *nmaps = 0; /* nothing set-up here */
565
566 error_out:
567 return XFS_ERROR(error);
568 }
569
570 /*
571 * If the caller is doing a write at the end of the file,
572 * then extend the allocation out to the file system's write
573 * iosize. We clean up any extra space left over when the
574 * file is closed in xfs_inactive().
575 *
576 * For sync writes, we are flushing delayed allocate space to
577 * try to make additional space available for allocation near
578 * the filesystem full boundary - preallocation hurts in that
579 * situation, of course.
580 */
581 STATIC int
582 xfs_iomap_eof_want_preallocate(
583 xfs_mount_t *mp,
584 xfs_iocore_t *io,
585 xfs_fsize_t isize,
586 xfs_off_t offset,
587 size_t count,
588 int ioflag,
589 xfs_bmbt_irec_t *imap,
590 int nimaps,
591 int *prealloc)
592 {
593 xfs_fileoff_t start_fsb;
594 xfs_filblks_t count_fsb;
595 xfs_fsblock_t firstblock;
596 int n, error, imaps;
597
598 *prealloc = 0;
599 if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize)
600 return 0;
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, ((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 imaps = nimaps;
610 firstblock = NULLFSBLOCK;
611 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 0,
612 &firstblock, 0, imap, &imaps, NULL, NULL);
613 if (error)
614 return error;
615 for (n = 0; n < imaps; n++) {
616 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
617 (imap[n].br_startblock != DELAYSTARTBLOCK))
618 return 0;
619 start_fsb += imap[n].br_blockcount;
620 count_fsb -= imap[n].br_blockcount;
621 }
622 }
623 *prealloc = 1;
624 return 0;
625 }
626
627 int
628 xfs_iomap_write_delay(
629 xfs_inode_t *ip,
630 xfs_off_t offset,
631 size_t count,
632 int ioflag,
633 xfs_bmbt_irec_t *ret_imap,
634 int *nmaps)
635 {
636 xfs_mount_t *mp = ip->i_mount;
637 xfs_iocore_t *io = &ip->i_iocore;
638 xfs_fileoff_t offset_fsb;
639 xfs_fileoff_t last_fsb;
640 xfs_off_t aligned_offset;
641 xfs_fileoff_t ioalign;
642 xfs_fsblock_t firstblock;
643 xfs_extlen_t extsz;
644 xfs_fsize_t isize;
645 int nimaps;
646 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
647 int prealloc, fsynced = 0;
648 int error;
649
650 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
651
652 /*
653 * Make sure that the dquots are there. This doesn't hold
654 * the ilock across a disk read.
655 */
656 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
657 if (error)
658 return XFS_ERROR(error);
659
660 if (XFS_IS_REALTIME_INODE(ip)) {
661 if (!(extsz = ip->i_d.di_extsize))
662 extsz = mp->m_sb.sb_rextsize;
663 } else {
664 extsz = ip->i_d.di_extsize;
665 }
666
667 offset_fsb = XFS_B_TO_FSBT(mp, offset);
668
669 retry:
670 isize = ip->i_d.di_size;
671 if (io->io_new_size > isize)
672 isize = io->io_new_size;
673
674 error = xfs_iomap_eof_want_preallocate(mp, io, isize, offset, count,
675 ioflag, imap, XFS_WRITE_IMAPS, &prealloc);
676 if (error)
677 return error;
678
679 if (prealloc) {
680 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
681 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
682 last_fsb = ioalign + mp->m_writeio_blocks;
683 } else {
684 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
685 }
686
687 if (prealloc || extsz) {
688 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz,
689 &last_fsb);
690 if (error)
691 return error;
692 }
693
694 nimaps = XFS_WRITE_IMAPS;
695 firstblock = NULLFSBLOCK;
696 error = XFS_BMAPI(mp, NULL, io, offset_fsb,
697 (xfs_filblks_t)(last_fsb - offset_fsb),
698 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
699 XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
700 &nimaps, NULL, NULL);
701 if (error && (error != ENOSPC))
702 return XFS_ERROR(error);
703
704 /*
705 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
706 * then we must have run out of space - flush delalloc, and retry..
707 */
708 if (nimaps == 0) {
709 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
710 io, offset, count);
711 if (xfs_flush_space(ip, &fsynced, &ioflag))
712 return XFS_ERROR(ENOSPC);
713
714 error = 0;
715 goto retry;
716 }
717
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 (unsigned long long)ret_imap->br_startblock,
725 (unsigned long long)ret_imap->br_startoff,
726 (unsigned long long)ret_imap->br_blockcount,
727 ret_imap->br_state);
728 }
729
730 *ret_imap = imap[0];
731 *nmaps = 1;
732
733 return 0;
734 }
735
736 /*
737 * Pass in a delayed allocate extent, convert it to real extents;
738 * return to the caller the extent we create which maps on top of
739 * the originating callers request.
740 *
741 * Called without a lock on the inode.
742 */
743 int
744 xfs_iomap_write_allocate(
745 xfs_inode_t *ip,
746 xfs_off_t offset,
747 size_t count,
748 xfs_bmbt_irec_t *map,
749 int *retmap)
750 {
751 xfs_mount_t *mp = ip->i_mount;
752 xfs_iocore_t *io = &ip->i_iocore;
753 xfs_fileoff_t offset_fsb, last_block;
754 xfs_fileoff_t end_fsb, map_start_fsb;
755 xfs_fsblock_t first_block;
756 xfs_bmap_free_t free_list;
757 xfs_filblks_t count_fsb;
758 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
759 xfs_trans_t *tp;
760 int i, nimaps, committed;
761 int error = 0;
762 int nres;
763
764 *retmap = 0;
765
766 /*
767 * Make sure that the dquots are there.
768 */
769 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
770 return XFS_ERROR(error);
771
772 offset_fsb = XFS_B_TO_FSBT(mp, offset);
773 count_fsb = map->br_blockcount;
774 map_start_fsb = map->br_startoff;
775
776 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
777
778 while (count_fsb != 0) {
779 /*
780 * Set up a transaction with which to allocate the
781 * backing store for the file. Do allocations in a
782 * loop until we get some space in the range we are
783 * interested in. The other space that might be allocated
784 * is in the delayed allocation extent on which we sit
785 * but before our buffer starts.
786 */
787
788 nimaps = 0;
789 while (nimaps == 0) {
790 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
791 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
792 error = xfs_trans_reserve(tp, nres,
793 XFS_WRITE_LOG_RES(mp),
794 0, XFS_TRANS_PERM_LOG_RES,
795 XFS_WRITE_LOG_COUNT);
796 if (error == ENOSPC) {
797 error = xfs_trans_reserve(tp, 0,
798 XFS_WRITE_LOG_RES(mp),
799 0,
800 XFS_TRANS_PERM_LOG_RES,
801 XFS_WRITE_LOG_COUNT);
802 }
803 if (error) {
804 xfs_trans_cancel(tp, 0);
805 return XFS_ERROR(error);
806 }
807 xfs_ilock(ip, XFS_ILOCK_EXCL);
808 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
809 xfs_trans_ihold(tp, ip);
810
811 XFS_BMAP_INIT(&free_list, &first_block);
812
813 nimaps = XFS_STRAT_WRITE_IMAPS;
814 /*
815 * Ensure we don't go beyond eof - it is possible
816 * the extents changed since we did the read call,
817 * we dropped the ilock in the interim.
818 */
819
820 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size);
821 xfs_bmap_last_offset(NULL, ip, &last_block,
822 XFS_DATA_FORK);
823 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
824 if ((map_start_fsb + count_fsb) > last_block) {
825 count_fsb = last_block - map_start_fsb;
826 if (count_fsb == 0) {
827 error = EAGAIN;
828 goto trans_cancel;
829 }
830 }
831
832 /* Go get the actual blocks */
833 error = XFS_BMAPI(mp, tp, io, map_start_fsb, count_fsb,
834 XFS_BMAPI_WRITE, &first_block, 1,
835 imap, &nimaps, &free_list, NULL);
836 if (error)
837 goto trans_cancel;
838
839 error = xfs_bmap_finish(&tp, &free_list,
840 first_block, &committed);
841 if (error)
842 goto trans_cancel;
843
844 error = xfs_trans_commit(tp,
845 XFS_TRANS_RELEASE_LOG_RES, NULL);
846 if (error)
847 goto error0;
848
849 xfs_iunlock(ip, XFS_ILOCK_EXCL);
850 }
851
852 /*
853 * See if we were able to allocate an extent that
854 * covers at least part of the callers request
855 */
856
857 for (i = 0; i < nimaps; i++) {
858 if (!(io->io_flags & XFS_IOCORE_RT) &&
859 !imap[i].br_startblock) {
860 cmn_err(CE_PANIC,"Access to block zero: "
861 "fs <%s> inode: %lld "
862 "start_block : %llx start_off : %llx "
863 "blkcnt : %llx extent-state : %x \n",
864 (ip->i_mount)->m_fsname,
865 (long long)ip->i_ino,
866 (unsigned long long)
867 imap[i].br_startblock,
868 (unsigned long long)
869 imap[i].br_startoff,
870 (unsigned long long)
871 imap[i].br_blockcount,
872 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_fileoff_t offset_fsb;
910 xfs_filblks_t count_fsb;
911 xfs_filblks_t numblks_fsb;
912 xfs_fsblock_t firstfsb;
913 int nimaps;
914 xfs_trans_t *tp;
915 xfs_bmbt_irec_t imap;
916 xfs_bmap_free_t free_list;
917 uint resblks;
918 int committed;
919 int error;
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 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
929
930 do {
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, resblks,
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(mp, tp, io, offset_fsb, count_fsb,
957 XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb,
958 1, &imap, &nimaps, &free_list, NULL);
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 (unsigned long long)imap.br_startblock,
979 (unsigned long long)imap.br_startoff,
980 (unsigned long long)imap.br_blockcount,
981 imap.br_state);
982 }
983
984 if ((numblks_fsb = imap.br_blockcount) == 0) {
985 /*
986 * The numblks_fsb value should always get
987 * smaller, otherwise the loop is stuck.
988 */
989 ASSERT(imap.br_blockcount);
990 break;
991 }
992 offset_fsb += numblks_fsb;
993 count_fsb -= numblks_fsb;
994 } while (count_fsb > 0);
995
996 return 0;
997
998 error_on_bmapi_transaction:
999 xfs_bmap_cancel(&free_list);
1000 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
1001 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1002 error0:
1003 return XFS_ERROR(error);
1004 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree