Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
3e57ecf6 | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
7b718769 | 3 | * All Rights Reserved. |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
1da177e4 | 19 | #include "xfs_fs.h" |
70a9883c | 20 | #include "xfs_shared.h" |
239880ef DC |
21 | #include "xfs_format.h" |
22 | #include "xfs_log_format.h" | |
23 | #include "xfs_trans_resv.h" | |
1da177e4 | 24 | #include "xfs_mount.h" |
1da177e4 | 25 | #include "xfs_inode.h" |
a844f451 | 26 | #include "xfs_btree.h" |
a4fbe6ab | 27 | #include "xfs_bmap_btree.h" |
1da177e4 | 28 | #include "xfs_bmap.h" |
68988114 | 29 | #include "xfs_bmap_util.h" |
1da177e4 | 30 | #include "xfs_error.h" |
a4fbe6ab | 31 | #include "xfs_trans.h" |
1da177e4 | 32 | #include "xfs_trans_space.h" |
1da177e4 | 33 | #include "xfs_iomap.h" |
0b1b213f | 34 | #include "xfs_trace.h" |
27b52867 | 35 | #include "xfs_icache.h" |
a4fbe6ab | 36 | #include "xfs_quota.h" |
76a4202a BF |
37 | #include "xfs_dquot_item.h" |
38 | #include "xfs_dquot.h" | |
1da177e4 | 39 | |
1da177e4 LT |
40 | |
41 | #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ | |
42 | << mp->m_writeio_log) | |
1da177e4 LT |
43 | #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP |
44 | ||
dd9f438e NS |
45 | STATIC int |
46 | xfs_iomap_eof_align_last_fsb( | |
47 | xfs_mount_t *mp, | |
541d7d3c | 48 | xfs_inode_t *ip, |
dd9f438e NS |
49 | xfs_extlen_t extsize, |
50 | xfs_fileoff_t *last_fsb) | |
51 | { | |
bf322d98 | 52 | xfs_extlen_t align = 0; |
dd9f438e NS |
53 | int eof, error; |
54 | ||
bf322d98 CH |
55 | if (!XFS_IS_REALTIME_INODE(ip)) { |
56 | /* | |
57 | * Round up the allocation request to a stripe unit | |
58 | * (m_dalign) boundary if the file size is >= stripe unit | |
59 | * size, and we are allocating past the allocation eof. | |
60 | * | |
61 | * If mounted with the "-o swalloc" option the alignment is | |
62 | * increased from the strip unit size to the stripe width. | |
63 | */ | |
64 | if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC)) | |
65 | align = mp->m_swidth; | |
66 | else if (mp->m_dalign) | |
67 | align = mp->m_dalign; | |
68 | ||
76b57302 PW |
69 | if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align)) |
70 | align = 0; | |
bf322d98 | 71 | } |
dd9f438e NS |
72 | |
73 | /* | |
74 | * Always round up the allocation request to an extent boundary | |
75 | * (when file on a real-time subvolume or has di_extsize hint). | |
76 | */ | |
77 | if (extsize) { | |
76b57302 PW |
78 | if (align) |
79 | align = roundup_64(align, extsize); | |
dd9f438e NS |
80 | else |
81 | align = extsize; | |
dd9f438e NS |
82 | } |
83 | ||
76b57302 PW |
84 | if (align) { |
85 | xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align); | |
541d7d3c | 86 | error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); |
dd9f438e NS |
87 | if (error) |
88 | return error; | |
89 | if (eof) | |
90 | *last_fsb = new_last_fsb; | |
91 | } | |
92 | return 0; | |
93 | } | |
94 | ||
572d95f4 | 95 | STATIC int |
6d4a8ecb | 96 | xfs_alert_fsblock_zero( |
572d95f4 NS |
97 | xfs_inode_t *ip, |
98 | xfs_bmbt_irec_t *imap) | |
99 | { | |
6a19d939 | 100 | xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO, |
572d95f4 NS |
101 | "Access to block zero in inode %llu " |
102 | "start_block: %llx start_off: %llx " | |
08e96e1a | 103 | "blkcnt: %llx extent-state: %x", |
572d95f4 NS |
104 | (unsigned long long)ip->i_ino, |
105 | (unsigned long long)imap->br_startblock, | |
106 | (unsigned long long)imap->br_startoff, | |
107 | (unsigned long long)imap->br_blockcount, | |
108 | imap->br_state); | |
2451337d | 109 | return -EFSCORRUPTED; |
572d95f4 NS |
110 | } |
111 | ||
a206c817 | 112 | int |
1da177e4 LT |
113 | xfs_iomap_write_direct( |
114 | xfs_inode_t *ip, | |
f403b7f4 | 115 | xfs_off_t offset, |
1da177e4 | 116 | size_t count, |
3070451e | 117 | xfs_bmbt_irec_t *imap, |
405f8042 | 118 | int nmaps) |
1da177e4 LT |
119 | { |
120 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
121 | xfs_fileoff_t offset_fsb; |
122 | xfs_fileoff_t last_fsb; | |
dd9f438e | 123 | xfs_filblks_t count_fsb, resaligned; |
1da177e4 | 124 | xfs_fsblock_t firstfsb; |
dd9f438e | 125 | xfs_extlen_t extsz, temp; |
0116d935 | 126 | int nimaps; |
06d10dd9 | 127 | int quota_flag; |
1da177e4 LT |
128 | int rt; |
129 | xfs_trans_t *tp; | |
1da177e4 | 130 | xfs_bmap_free_t free_list; |
dd9f438e | 131 | uint qblocks, resblks, resrtextents; |
dd9f438e | 132 | int error; |
009c6e87 | 133 | int lockmode; |
1ca19157 | 134 | int bmapi_flags = XFS_BMAPI_PREALLOC; |
1da177e4 | 135 | |
dd9f438e | 136 | rt = XFS_IS_REALTIME_INODE(ip); |
957d0ebe | 137 | extsz = xfs_get_extsz_hint(ip); |
009c6e87 BF |
138 | lockmode = XFS_ILOCK_SHARED; /* locked by caller */ |
139 | ||
140 | ASSERT(xfs_isilocked(ip, lockmode)); | |
1da177e4 | 141 | |
957d0ebe DC |
142 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
143 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
ce7ae151 | 144 | if ((offset + count) > XFS_ISIZE(ip)) { |
009c6e87 BF |
145 | /* |
146 | * Assert that the in-core extent list is present since this can | |
147 | * call xfs_iread_extents() and we only have the ilock shared. | |
148 | * This should be safe because the lock was held around a bmapi | |
149 | * call in the caller and we only need it to access the in-core | |
150 | * list. | |
151 | */ | |
152 | ASSERT(XFS_IFORK_PTR(ip, XFS_DATA_FORK)->if_flags & | |
153 | XFS_IFEXTENTS); | |
9f6c92b9 | 154 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e | 155 | if (error) |
009c6e87 | 156 | goto out_unlock; |
1da177e4 | 157 | } else { |
405f8042 | 158 | if (nmaps && (imap->br_startblock == HOLESTARTBLOCK)) |
dd9f438e | 159 | last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
3070451e CH |
160 | imap->br_blockcount + |
161 | imap->br_startoff); | |
1da177e4 | 162 | } |
dd9f438e NS |
163 | count_fsb = last_fsb - offset_fsb; |
164 | ASSERT(count_fsb > 0); | |
165 | ||
166 | resaligned = count_fsb; | |
167 | if (unlikely(extsz)) { | |
168 | if ((temp = do_mod(offset_fsb, extsz))) | |
169 | resaligned += temp; | |
170 | if ((temp = do_mod(resaligned, extsz))) | |
171 | resaligned += extsz - temp; | |
172 | } | |
173 | ||
174 | if (unlikely(rt)) { | |
175 | resrtextents = qblocks = resaligned; | |
176 | resrtextents /= mp->m_sb.sb_rextsize; | |
84e1e99f DC |
177 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
178 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
179 | } else { | |
180 | resrtextents = 0; | |
dd9f438e | 181 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
84e1e99f DC |
182 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
183 | } | |
1da177e4 | 184 | |
009c6e87 BF |
185 | /* |
186 | * Drop the shared lock acquired by the caller, attach the dquot if | |
187 | * necessary and move on to transaction setup. | |
188 | */ | |
189 | xfs_iunlock(ip, lockmode); | |
190 | error = xfs_qm_dqattach(ip, 0); | |
191 | if (error) | |
192 | return error; | |
193 | ||
1da177e4 | 194 | /* |
06d10dd9 | 195 | * Allocate and setup the transaction |
1da177e4 | 196 | */ |
1da177e4 | 197 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); |
1ca19157 DC |
198 | |
199 | /* | |
200 | * For DAX, we do not allocate unwritten extents, but instead we zero | |
201 | * the block before we commit the transaction. Ideally we'd like to do | |
202 | * this outside the transaction context, but if we commit and then crash | |
203 | * we may not have zeroed the blocks and this will be exposed on | |
204 | * recovery of the allocation. Hence we must zero before commit. | |
3b0fe478 | 205 | * |
1ca19157 DC |
206 | * Further, if we are mapping unwritten extents here, we need to zero |
207 | * and convert them to written so that we don't need an unwritten extent | |
208 | * callback for DAX. This also means that we need to be able to dip into | |
3b0fe478 DC |
209 | * the reserve block pool for bmbt block allocation if there is no space |
210 | * left but we need to do unwritten extent conversion. | |
1ca19157 | 211 | */ |
3b0fe478 | 212 | |
1ca19157 DC |
213 | if (IS_DAX(VFS_I(ip))) { |
214 | bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO; | |
3b0fe478 DC |
215 | if (ISUNWRITTEN(imap)) { |
216 | tp->t_flags |= XFS_TRANS_RESERVE; | |
217 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; | |
218 | } | |
1ca19157 | 219 | } |
3d3c8b52 JL |
220 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, |
221 | resblks, resrtextents); | |
1da177e4 | 222 | /* |
06d10dd9 | 223 | * Check for running out of space, note: need lock to return |
1da177e4 | 224 | */ |
507630b2 | 225 | if (error) { |
4906e215 | 226 | xfs_trans_cancel(tp); |
b474c7ae | 227 | return error; |
507630b2 DC |
228 | } |
229 | ||
009c6e87 BF |
230 | lockmode = XFS_ILOCK_EXCL; |
231 | xfs_ilock(ip, lockmode); | |
1da177e4 | 232 | |
7d095257 | 233 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
dd9f438e | 234 | if (error) |
507630b2 | 235 | goto out_trans_cancel; |
1da177e4 | 236 | |
ddc3415a | 237 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 238 | |
1da177e4 | 239 | /* |
3070451e CH |
240 | * From this point onwards we overwrite the imap pointer that the |
241 | * caller gave to us. | |
1da177e4 | 242 | */ |
9d87c319 | 243 | xfs_bmap_init(&free_list, &firstfsb); |
06d10dd9 | 244 | nimaps = 1; |
d531d91d | 245 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
264e89ad | 246 | bmapi_flags, &firstfsb, resblks, imap, |
dbd5c8c9 | 247 | &nimaps, &free_list); |
06d10dd9 | 248 | if (error) |
507630b2 | 249 | goto out_bmap_cancel; |
1da177e4 LT |
250 | |
251 | /* | |
06d10dd9 | 252 | * Complete the transaction |
1da177e4 | 253 | */ |
f6106efa | 254 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
06d10dd9 | 255 | if (error) |
507630b2 | 256 | goto out_bmap_cancel; |
1ca19157 | 257 | |
70393313 | 258 | error = xfs_trans_commit(tp); |
06d10dd9 | 259 | if (error) |
507630b2 | 260 | goto out_unlock; |
1da177e4 | 261 | |
06d10dd9 NS |
262 | /* |
263 | * Copy any maps to caller's array and return any error. | |
264 | */ | |
1da177e4 | 265 | if (nimaps == 0) { |
2451337d | 266 | error = -ENOSPC; |
507630b2 | 267 | goto out_unlock; |
572d95f4 NS |
268 | } |
269 | ||
507630b2 | 270 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 271 | error = xfs_alert_fsblock_zero(ip, imap); |
1da177e4 | 272 | |
507630b2 | 273 | out_unlock: |
009c6e87 | 274 | xfs_iunlock(ip, lockmode); |
507630b2 | 275 | return error; |
1da177e4 | 276 | |
507630b2 | 277 | out_bmap_cancel: |
1da177e4 | 278 | xfs_bmap_cancel(&free_list); |
ea562ed6 | 279 | xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag); |
507630b2 | 280 | out_trans_cancel: |
4906e215 | 281 | xfs_trans_cancel(tp); |
507630b2 | 282 | goto out_unlock; |
1da177e4 LT |
283 | } |
284 | ||
dd9f438e | 285 | /* |
8de2bf93 DC |
286 | * If the caller is doing a write at the end of the file, then extend the |
287 | * allocation out to the file system's write iosize. We clean up any extra | |
288 | * space left over when the file is closed in xfs_inactive(). | |
055388a3 DC |
289 | * |
290 | * If we find we already have delalloc preallocation beyond EOF, don't do more | |
291 | * preallocation as it it not needed. | |
dd9f438e NS |
292 | */ |
293 | STATIC int | |
294 | xfs_iomap_eof_want_preallocate( | |
295 | xfs_mount_t *mp, | |
541d7d3c | 296 | xfs_inode_t *ip, |
dd9f438e NS |
297 | xfs_off_t offset, |
298 | size_t count, | |
dd9f438e NS |
299 | xfs_bmbt_irec_t *imap, |
300 | int nimaps, | |
301 | int *prealloc) | |
302 | { | |
303 | xfs_fileoff_t start_fsb; | |
304 | xfs_filblks_t count_fsb; | |
dd9f438e | 305 | int n, error, imaps; |
055388a3 | 306 | int found_delalloc = 0; |
dd9f438e NS |
307 | |
308 | *prealloc = 0; | |
ce7ae151 | 309 | if (offset + count <= XFS_ISIZE(ip)) |
dd9f438e NS |
310 | return 0; |
311 | ||
133eeb17 DC |
312 | /* |
313 | * If the file is smaller than the minimum prealloc and we are using | |
314 | * dynamic preallocation, don't do any preallocation at all as it is | |
315 | * likely this is the only write to the file that is going to be done. | |
316 | */ | |
317 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) && | |
318 | XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks)) | |
319 | return 0; | |
320 | ||
dd9f438e NS |
321 | /* |
322 | * If there are any real blocks past eof, then don't | |
323 | * do any speculative allocation. | |
324 | */ | |
325 | start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); | |
32972383 | 326 | count_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); |
dd9f438e NS |
327 | while (count_fsb > 0) { |
328 | imaps = nimaps; | |
5c8ed202 DC |
329 | error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps, |
330 | 0); | |
dd9f438e NS |
331 | if (error) |
332 | return error; | |
333 | for (n = 0; n < imaps; n++) { | |
334 | if ((imap[n].br_startblock != HOLESTARTBLOCK) && | |
335 | (imap[n].br_startblock != DELAYSTARTBLOCK)) | |
336 | return 0; | |
337 | start_fsb += imap[n].br_blockcount; | |
338 | count_fsb -= imap[n].br_blockcount; | |
055388a3 DC |
339 | |
340 | if (imap[n].br_startblock == DELAYSTARTBLOCK) | |
341 | found_delalloc = 1; | |
dd9f438e NS |
342 | } |
343 | } | |
055388a3 DC |
344 | if (!found_delalloc) |
345 | *prealloc = 1; | |
dd9f438e NS |
346 | return 0; |
347 | } | |
348 | ||
a1e16c26 DC |
349 | /* |
350 | * Determine the initial size of the preallocation. We are beyond the current | |
351 | * EOF here, but we need to take into account whether this is a sparse write or | |
352 | * an extending write when determining the preallocation size. Hence we need to | |
353 | * look up the extent that ends at the current write offset and use the result | |
354 | * to determine the preallocation size. | |
355 | * | |
356 | * If the extent is a hole, then preallocation is essentially disabled. | |
357 | * Otherwise we take the size of the preceeding data extent as the basis for the | |
358 | * preallocation size. If the size of the extent is greater than half the | |
359 | * maximum extent length, then use the current offset as the basis. This ensures | |
360 | * that for large files the preallocation size always extends to MAXEXTLEN | |
361 | * rather than falling short due to things like stripe unit/width alignment of | |
362 | * real extents. | |
363 | */ | |
e8108ced | 364 | STATIC xfs_fsblock_t |
a1e16c26 DC |
365 | xfs_iomap_eof_prealloc_initial_size( |
366 | struct xfs_mount *mp, | |
367 | struct xfs_inode *ip, | |
368 | xfs_off_t offset, | |
369 | xfs_bmbt_irec_t *imap, | |
370 | int nimaps) | |
371 | { | |
372 | xfs_fileoff_t start_fsb; | |
373 | int imaps = 1; | |
374 | int error; | |
375 | ||
376 | ASSERT(nimaps >= imaps); | |
377 | ||
378 | /* if we are using a specific prealloc size, return now */ | |
379 | if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) | |
380 | return 0; | |
381 | ||
133eeb17 DC |
382 | /* If the file is small, then use the minimum prealloc */ |
383 | if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign)) | |
384 | return 0; | |
385 | ||
a1e16c26 DC |
386 | /* |
387 | * As we write multiple pages, the offset will always align to the | |
388 | * start of a page and hence point to a hole at EOF. i.e. if the size is | |
389 | * 4096 bytes, we only have one block at FSB 0, but XFS_B_TO_FSB(4096) | |
390 | * will return FSB 1. Hence if there are blocks in the file, we want to | |
391 | * point to the block prior to the EOF block and not the hole that maps | |
392 | * directly at @offset. | |
393 | */ | |
394 | start_fsb = XFS_B_TO_FSB(mp, offset); | |
395 | if (start_fsb) | |
396 | start_fsb--; | |
397 | error = xfs_bmapi_read(ip, start_fsb, 1, imap, &imaps, XFS_BMAPI_ENTIRE); | |
398 | if (error) | |
399 | return 0; | |
400 | ||
401 | ASSERT(imaps == 1); | |
402 | if (imap[0].br_startblock == HOLESTARTBLOCK) | |
403 | return 0; | |
404 | if (imap[0].br_blockcount <= (MAXEXTLEN >> 1)) | |
e114b5fc | 405 | return imap[0].br_blockcount << 1; |
a1e16c26 DC |
406 | return XFS_B_TO_FSB(mp, offset); |
407 | } | |
408 | ||
76a4202a BF |
409 | STATIC bool |
410 | xfs_quota_need_throttle( | |
411 | struct xfs_inode *ip, | |
412 | int type, | |
413 | xfs_fsblock_t alloc_blocks) | |
414 | { | |
415 | struct xfs_dquot *dq = xfs_inode_dquot(ip, type); | |
416 | ||
417 | if (!dq || !xfs_this_quota_on(ip->i_mount, type)) | |
418 | return false; | |
419 | ||
420 | /* no hi watermark, no throttle */ | |
421 | if (!dq->q_prealloc_hi_wmark) | |
422 | return false; | |
423 | ||
424 | /* under the lo watermark, no throttle */ | |
425 | if (dq->q_res_bcount + alloc_blocks < dq->q_prealloc_lo_wmark) | |
426 | return false; | |
427 | ||
428 | return true; | |
429 | } | |
430 | ||
431 | STATIC void | |
432 | xfs_quota_calc_throttle( | |
433 | struct xfs_inode *ip, | |
434 | int type, | |
435 | xfs_fsblock_t *qblocks, | |
f074051f BF |
436 | int *qshift, |
437 | int64_t *qfreesp) | |
76a4202a BF |
438 | { |
439 | int64_t freesp; | |
440 | int shift = 0; | |
441 | struct xfs_dquot *dq = xfs_inode_dquot(ip, type); | |
442 | ||
5cca3f61 ES |
443 | /* no dq, or over hi wmark, squash the prealloc completely */ |
444 | if (!dq || dq->q_res_bcount >= dq->q_prealloc_hi_wmark) { | |
76a4202a | 445 | *qblocks = 0; |
f074051f | 446 | *qfreesp = 0; |
76a4202a BF |
447 | return; |
448 | } | |
449 | ||
450 | freesp = dq->q_prealloc_hi_wmark - dq->q_res_bcount; | |
451 | if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) { | |
452 | shift = 2; | |
453 | if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT]) | |
454 | shift += 2; | |
455 | if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT]) | |
456 | shift += 2; | |
457 | } | |
458 | ||
f074051f BF |
459 | if (freesp < *qfreesp) |
460 | *qfreesp = freesp; | |
461 | ||
76a4202a BF |
462 | /* only overwrite the throttle values if we are more aggressive */ |
463 | if ((freesp >> shift) < (*qblocks >> *qshift)) { | |
464 | *qblocks = freesp; | |
465 | *qshift = shift; | |
466 | } | |
467 | } | |
468 | ||
055388a3 DC |
469 | /* |
470 | * If we don't have a user specified preallocation size, dynamically increase | |
471 | * the preallocation size as the size of the file grows. Cap the maximum size | |
472 | * at a single extent or less if the filesystem is near full. The closer the | |
473 | * filesystem is to full, the smaller the maximum prealocation. | |
474 | */ | |
475 | STATIC xfs_fsblock_t | |
476 | xfs_iomap_prealloc_size( | |
477 | struct xfs_mount *mp, | |
a1e16c26 DC |
478 | struct xfs_inode *ip, |
479 | xfs_off_t offset, | |
480 | struct xfs_bmbt_irec *imap, | |
481 | int nimaps) | |
055388a3 DC |
482 | { |
483 | xfs_fsblock_t alloc_blocks = 0; | |
3c58b5f8 BF |
484 | int shift = 0; |
485 | int64_t freesp; | |
76a4202a BF |
486 | xfs_fsblock_t qblocks; |
487 | int qshift = 0; | |
055388a3 | 488 | |
a1e16c26 DC |
489 | alloc_blocks = xfs_iomap_eof_prealloc_initial_size(mp, ip, offset, |
490 | imap, nimaps); | |
3c58b5f8 BF |
491 | if (!alloc_blocks) |
492 | goto check_writeio; | |
76a4202a | 493 | qblocks = alloc_blocks; |
3c58b5f8 | 494 | |
c9bdbdc0 BF |
495 | /* |
496 | * MAXEXTLEN is not a power of two value but we round the prealloc down | |
497 | * to the nearest power of two value after throttling. To prevent the | |
498 | * round down from unconditionally reducing the maximum supported prealloc | |
499 | * size, we round up first, apply appropriate throttling, round down and | |
500 | * cap the value to MAXEXTLEN. | |
501 | */ | |
502 | alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN), | |
503 | alloc_blocks); | |
3c58b5f8 | 504 | |
0d485ada | 505 | freesp = percpu_counter_read_positive(&mp->m_fdblocks); |
3c58b5f8 BF |
506 | if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) { |
507 | shift = 2; | |
508 | if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT]) | |
509 | shift++; | |
510 | if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT]) | |
511 | shift++; | |
512 | if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT]) | |
513 | shift++; | |
514 | if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT]) | |
515 | shift++; | |
055388a3 | 516 | } |
76a4202a BF |
517 | |
518 | /* | |
f074051f BF |
519 | * Check each quota to cap the prealloc size, provide a shift value to |
520 | * throttle with and adjust amount of available space. | |
76a4202a BF |
521 | */ |
522 | if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks)) | |
f074051f BF |
523 | xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift, |
524 | &freesp); | |
76a4202a | 525 | if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks)) |
f074051f BF |
526 | xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift, |
527 | &freesp); | |
76a4202a | 528 | if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks)) |
f074051f BF |
529 | xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift, |
530 | &freesp); | |
76a4202a BF |
531 | |
532 | /* | |
533 | * The final prealloc size is set to the minimum of free space available | |
534 | * in each of the quotas and the overall filesystem. | |
535 | * | |
536 | * The shift throttle value is set to the maximum value as determined by | |
537 | * the global low free space values and per-quota low free space values. | |
538 | */ | |
539 | alloc_blocks = MIN(alloc_blocks, qblocks); | |
540 | shift = MAX(shift, qshift); | |
541 | ||
3c58b5f8 BF |
542 | if (shift) |
543 | alloc_blocks >>= shift; | |
c9bdbdc0 BF |
544 | /* |
545 | * rounddown_pow_of_two() returns an undefined result if we pass in | |
546 | * alloc_blocks = 0. | |
547 | */ | |
548 | if (alloc_blocks) | |
549 | alloc_blocks = rounddown_pow_of_two(alloc_blocks); | |
550 | if (alloc_blocks > MAXEXTLEN) | |
551 | alloc_blocks = MAXEXTLEN; | |
3c58b5f8 BF |
552 | |
553 | /* | |
554 | * If we are still trying to allocate more space than is | |
555 | * available, squash the prealloc hard. This can happen if we | |
556 | * have a large file on a small filesystem and the above | |
557 | * lowspace thresholds are smaller than MAXEXTLEN. | |
558 | */ | |
559 | while (alloc_blocks && alloc_blocks >= freesp) | |
560 | alloc_blocks >>= 4; | |
055388a3 | 561 | |
3c58b5f8 | 562 | check_writeio: |
055388a3 DC |
563 | if (alloc_blocks < mp->m_writeio_blocks) |
564 | alloc_blocks = mp->m_writeio_blocks; | |
565 | ||
19cb7e38 BF |
566 | trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift, |
567 | mp->m_writeio_blocks); | |
568 | ||
055388a3 DC |
569 | return alloc_blocks; |
570 | } | |
571 | ||
a206c817 | 572 | int |
1da177e4 LT |
573 | xfs_iomap_write_delay( |
574 | xfs_inode_t *ip, | |
f403b7f4 | 575 | xfs_off_t offset, |
1da177e4 | 576 | size_t count, |
405f8042 | 577 | xfs_bmbt_irec_t *ret_imap) |
1da177e4 LT |
578 | { |
579 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
580 | xfs_fileoff_t offset_fsb; |
581 | xfs_fileoff_t last_fsb; | |
dd9f438e NS |
582 | xfs_off_t aligned_offset; |
583 | xfs_fileoff_t ioalign; | |
dd9f438e | 584 | xfs_extlen_t extsz; |
1da177e4 | 585 | int nimaps; |
1da177e4 | 586 | xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; |
9aa05000 | 587 | int prealloc; |
dd9f438e | 588 | int error; |
1da177e4 | 589 | |
579aa9ca | 590 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 LT |
591 | |
592 | /* | |
593 | * Make sure that the dquots are there. This doesn't hold | |
594 | * the ilock across a disk read. | |
595 | */ | |
7d095257 | 596 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 | 597 | if (error) |
b474c7ae | 598 | return error; |
1da177e4 | 599 | |
957d0ebe | 600 | extsz = xfs_get_extsz_hint(ip); |
dd9f438e NS |
601 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
602 | ||
9f6c92b9 | 603 | error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, |
405f8042 | 604 | imap, XFS_WRITE_IMAPS, &prealloc); |
dd9f438e NS |
605 | if (error) |
606 | return error; | |
1da177e4 | 607 | |
8de2bf93 | 608 | retry: |
dd9f438e | 609 | if (prealloc) { |
a1e16c26 DC |
610 | xfs_fsblock_t alloc_blocks; |
611 | ||
612 | alloc_blocks = xfs_iomap_prealloc_size(mp, ip, offset, imap, | |
613 | XFS_WRITE_IMAPS); | |
055388a3 | 614 | |
1da177e4 LT |
615 | aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); |
616 | ioalign = XFS_B_TO_FSBT(mp, aligned_offset); | |
055388a3 | 617 | last_fsb = ioalign + alloc_blocks; |
dd9f438e NS |
618 | } else { |
619 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
1da177e4 | 620 | } |
1da177e4 | 621 | |
dd9f438e | 622 | if (prealloc || extsz) { |
9f6c92b9 | 623 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e | 624 | if (error) |
1da177e4 | 625 | return error; |
1da177e4 | 626 | } |
dd9f438e | 627 | |
3ed9116e DC |
628 | /* |
629 | * Make sure preallocation does not create extents beyond the range we | |
630 | * actually support in this filesystem. | |
631 | */ | |
d2c28191 DC |
632 | if (last_fsb > XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes)) |
633 | last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); | |
3ed9116e DC |
634 | |
635 | ASSERT(last_fsb > offset_fsb); | |
636 | ||
dd9f438e | 637 | nimaps = XFS_WRITE_IMAPS; |
4403280a CH |
638 | error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb, |
639 | imap, &nimaps, XFS_BMAPI_ENTIRE); | |
055388a3 DC |
640 | switch (error) { |
641 | case 0: | |
2451337d DC |
642 | case -ENOSPC: |
643 | case -EDQUOT: | |
055388a3 DC |
644 | break; |
645 | default: | |
b474c7ae | 646 | return error; |
055388a3 | 647 | } |
dd9f438e | 648 | |
1da177e4 | 649 | /* |
9aa05000 | 650 | * If bmapi returned us nothing, we got either ENOSPC or EDQUOT. Retry |
055388a3 | 651 | * without EOF preallocation. |
1da177e4 LT |
652 | */ |
653 | if (nimaps == 0) { | |
0b1b213f | 654 | trace_xfs_delalloc_enospc(ip, offset, count); |
9aa05000 DC |
655 | if (prealloc) { |
656 | prealloc = 0; | |
657 | error = 0; | |
658 | goto retry; | |
055388a3 | 659 | } |
2451337d | 660 | return error ? error : -ENOSPC; |
1da177e4 LT |
661 | } |
662 | ||
86c4d623 | 663 | if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 664 | return xfs_alert_fsblock_zero(ip, &imap[0]); |
dd9f438e | 665 | |
27b52867 BF |
666 | /* |
667 | * Tag the inode as speculatively preallocated so we can reclaim this | |
668 | * space on demand, if necessary. | |
669 | */ | |
670 | if (prealloc) | |
671 | xfs_inode_set_eofblocks_tag(ip); | |
672 | ||
dd9f438e | 673 | *ret_imap = imap[0]; |
1da177e4 LT |
674 | return 0; |
675 | } | |
676 | ||
677 | /* | |
678 | * Pass in a delayed allocate extent, convert it to real extents; | |
679 | * return to the caller the extent we create which maps on top of | |
680 | * the originating callers request. | |
681 | * | |
682 | * Called without a lock on the inode. | |
e4143a1c DC |
683 | * |
684 | * We no longer bother to look at the incoming map - all we have to | |
685 | * guarantee is that whatever we allocate fills the required range. | |
1da177e4 | 686 | */ |
a206c817 | 687 | int |
1da177e4 LT |
688 | xfs_iomap_write_allocate( |
689 | xfs_inode_t *ip, | |
f403b7f4 | 690 | xfs_off_t offset, |
405f8042 | 691 | xfs_bmbt_irec_t *imap) |
1da177e4 LT |
692 | { |
693 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
694 | xfs_fileoff_t offset_fsb, last_block; |
695 | xfs_fileoff_t end_fsb, map_start_fsb; | |
696 | xfs_fsblock_t first_block; | |
697 | xfs_bmap_free_t free_list; | |
698 | xfs_filblks_t count_fsb; | |
1da177e4 | 699 | xfs_trans_t *tp; |
f6106efa | 700 | int nimaps; |
1da177e4 LT |
701 | int error = 0; |
702 | int nres; | |
703 | ||
1da177e4 LT |
704 | /* |
705 | * Make sure that the dquots are there. | |
706 | */ | |
7d095257 CH |
707 | error = xfs_qm_dqattach(ip, 0); |
708 | if (error) | |
b474c7ae | 709 | return error; |
1da177e4 | 710 | |
24e17b5f | 711 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
3070451e CH |
712 | count_fsb = imap->br_blockcount; |
713 | map_start_fsb = imap->br_startoff; | |
1da177e4 | 714 | |
ff6d6af2 | 715 | XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); |
1da177e4 LT |
716 | |
717 | while (count_fsb != 0) { | |
718 | /* | |
719 | * Set up a transaction with which to allocate the | |
720 | * backing store for the file. Do allocations in a | |
721 | * loop until we get some space in the range we are | |
722 | * interested in. The other space that might be allocated | |
723 | * is in the delayed allocation extent on which we sit | |
724 | * but before our buffer starts. | |
725 | */ | |
726 | ||
727 | nimaps = 0; | |
728 | while (nimaps == 0) { | |
729 | tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); | |
84e1e99f | 730 | tp->t_flags |= XFS_TRANS_RESERVE; |
1da177e4 | 731 | nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); |
3d3c8b52 JL |
732 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, |
733 | nres, 0); | |
1da177e4 | 734 | if (error) { |
4906e215 | 735 | xfs_trans_cancel(tp); |
b474c7ae | 736 | return error; |
1da177e4 LT |
737 | } |
738 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
ddc3415a | 739 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 740 | |
9d87c319 | 741 | xfs_bmap_init(&free_list, &first_block); |
1da177e4 | 742 | |
1da177e4 | 743 | /* |
e4143a1c DC |
744 | * it is possible that the extents have changed since |
745 | * we did the read call as we dropped the ilock for a | |
746 | * while. We have to be careful about truncates or hole | |
747 | * punchs here - we are not allowed to allocate | |
748 | * non-delalloc blocks here. | |
749 | * | |
750 | * The only protection against truncation is the pages | |
751 | * for the range we are being asked to convert are | |
752 | * locked and hence a truncate will block on them | |
753 | * first. | |
754 | * | |
755 | * As a result, if we go beyond the range we really | |
756 | * need and hit an delalloc extent boundary followed by | |
757 | * a hole while we have excess blocks in the map, we | |
758 | * will fill the hole incorrectly and overrun the | |
759 | * transaction reservation. | |
760 | * | |
761 | * Using a single map prevents this as we are forced to | |
762 | * check each map we look for overlap with the desired | |
763 | * range and abort as soon as we find it. Also, given | |
764 | * that we only return a single map, having one beyond | |
765 | * what we can return is probably a bit silly. | |
766 | * | |
767 | * We also need to check that we don't go beyond EOF; | |
768 | * this is a truncate optimisation as a truncate sets | |
769 | * the new file size before block on the pages we | |
770 | * currently have locked under writeback. Because they | |
771 | * are about to be tossed, we don't need to write them | |
772 | * back.... | |
1da177e4 | 773 | */ |
e4143a1c | 774 | nimaps = 1; |
ce7ae151 | 775 | end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)); |
7fb2cd4d | 776 | error = xfs_bmap_last_offset(ip, &last_block, |
7c9ef85c DC |
777 | XFS_DATA_FORK); |
778 | if (error) | |
779 | goto trans_cancel; | |
780 | ||
1da177e4 LT |
781 | last_block = XFS_FILEOFF_MAX(last_block, end_fsb); |
782 | if ((map_start_fsb + count_fsb) > last_block) { | |
783 | count_fsb = last_block - map_start_fsb; | |
784 | if (count_fsb == 0) { | |
2451337d | 785 | error = -EAGAIN; |
1da177e4 LT |
786 | goto trans_cancel; |
787 | } | |
788 | } | |
789 | ||
3070451e | 790 | /* |
3070451e CH |
791 | * From this point onwards we overwrite the imap |
792 | * pointer that the caller gave to us. | |
793 | */ | |
c0dc7828 | 794 | error = xfs_bmapi_write(tp, ip, map_start_fsb, |
dbd5c8c9 BF |
795 | count_fsb, 0, &first_block, |
796 | nres, imap, &nimaps, | |
797 | &free_list); | |
1da177e4 LT |
798 | if (error) |
799 | goto trans_cancel; | |
800 | ||
f6106efa | 801 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
1da177e4 LT |
802 | if (error) |
803 | goto trans_cancel; | |
804 | ||
70393313 | 805 | error = xfs_trans_commit(tp); |
1da177e4 LT |
806 | if (error) |
807 | goto error0; | |
808 | ||
809 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
810 | } | |
811 | ||
812 | /* | |
813 | * See if we were able to allocate an extent that | |
814 | * covers at least part of the callers request | |
815 | */ | |
3070451e | 816 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 817 | return xfs_alert_fsblock_zero(ip, imap); |
86c4d623 | 818 | |
3070451e CH |
819 | if ((offset_fsb >= imap->br_startoff) && |
820 | (offset_fsb < (imap->br_startoff + | |
821 | imap->br_blockcount))) { | |
ff6d6af2 | 822 | XFS_STATS_INC(mp, xs_xstrat_quick); |
e4143a1c | 823 | return 0; |
1da177e4 LT |
824 | } |
825 | ||
e4143a1c DC |
826 | /* |
827 | * So far we have not mapped the requested part of the | |
1da177e4 LT |
828 | * file, just surrounding data, try again. |
829 | */ | |
3070451e CH |
830 | count_fsb -= imap->br_blockcount; |
831 | map_start_fsb = imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
832 | } |
833 | ||
834 | trans_cancel: | |
835 | xfs_bmap_cancel(&free_list); | |
4906e215 | 836 | xfs_trans_cancel(tp); |
1da177e4 LT |
837 | error0: |
838 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
b474c7ae | 839 | return error; |
1da177e4 LT |
840 | } |
841 | ||
842 | int | |
843 | xfs_iomap_write_unwritten( | |
844 | xfs_inode_t *ip, | |
f403b7f4 | 845 | xfs_off_t offset, |
d32057fc | 846 | xfs_off_t count) |
1da177e4 LT |
847 | { |
848 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
849 | xfs_fileoff_t offset_fsb; |
850 | xfs_filblks_t count_fsb; | |
851 | xfs_filblks_t numblks_fsb; | |
dd9f438e NS |
852 | xfs_fsblock_t firstfsb; |
853 | int nimaps; | |
854 | xfs_trans_t *tp; | |
855 | xfs_bmbt_irec_t imap; | |
856 | xfs_bmap_free_t free_list; | |
84803fb7 | 857 | xfs_fsize_t i_size; |
dd9f438e | 858 | uint resblks; |
1da177e4 | 859 | int error; |
1da177e4 | 860 | |
0b1b213f | 861 | trace_xfs_unwritten_convert(ip, offset, count); |
1da177e4 LT |
862 | |
863 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
864 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
865 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); | |
866 | ||
4ddd8bb1 LM |
867 | /* |
868 | * Reserve enough blocks in this transaction for two complete extent | |
869 | * btree splits. We may be converting the middle part of an unwritten | |
870 | * extent and in this case we will insert two new extents in the btree | |
871 | * each of which could cause a full split. | |
872 | * | |
873 | * This reservation amount will be used in the first call to | |
874 | * xfs_bmbt_split() to select an AG with enough space to satisfy the | |
875 | * rest of the operation. | |
876 | */ | |
dd9f438e | 877 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
1da177e4 | 878 | |
dd9f438e | 879 | do { |
1da177e4 LT |
880 | /* |
881 | * set up a transaction to convert the range of extents | |
882 | * from unwritten to real. Do allocations in a loop until | |
883 | * we have covered the range passed in. | |
80641dc6 CH |
884 | * |
885 | * Note that we open code the transaction allocation here | |
886 | * to pass KM_NOFS--we can't risk to recursing back into | |
887 | * the filesystem here as we might be asked to write out | |
888 | * the same inode that we complete here and might deadlock | |
889 | * on the iolock. | |
1da177e4 | 890 | */ |
d9457dc0 | 891 | sb_start_intwrite(mp->m_super); |
80641dc6 | 892 | tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS); |
d9457dc0 | 893 | tp->t_flags |= XFS_TRANS_RESERVE | XFS_TRANS_FREEZE_PROT; |
3d3c8b52 JL |
894 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, |
895 | resblks, 0); | |
1da177e4 | 896 | if (error) { |
4906e215 | 897 | xfs_trans_cancel(tp); |
b474c7ae | 898 | return error; |
1da177e4 LT |
899 | } |
900 | ||
901 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
ddc3415a | 902 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 LT |
903 | |
904 | /* | |
905 | * Modify the unwritten extent state of the buffer. | |
906 | */ | |
9d87c319 | 907 | xfs_bmap_init(&free_list, &firstfsb); |
1da177e4 | 908 | nimaps = 1; |
c0dc7828 | 909 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
dbd5c8c9 BF |
910 | XFS_BMAPI_CONVERT, &firstfsb, resblks, |
911 | &imap, &nimaps, &free_list); | |
1da177e4 LT |
912 | if (error) |
913 | goto error_on_bmapi_transaction; | |
914 | ||
84803fb7 CH |
915 | /* |
916 | * Log the updated inode size as we go. We have to be careful | |
917 | * to only log it up to the actual write offset if it is | |
918 | * halfway into a block. | |
919 | */ | |
920 | i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb); | |
921 | if (i_size > offset + count) | |
922 | i_size = offset + count; | |
923 | ||
924 | i_size = xfs_new_eof(ip, i_size); | |
925 | if (i_size) { | |
926 | ip->i_d.di_size = i_size; | |
927 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
928 | } | |
929 | ||
f6106efa | 930 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
1da177e4 LT |
931 | if (error) |
932 | goto error_on_bmapi_transaction; | |
933 | ||
70393313 | 934 | error = xfs_trans_commit(tp); |
1da177e4 LT |
935 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
936 | if (error) | |
b474c7ae | 937 | return error; |
572d95f4 | 938 | |
86c4d623 | 939 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 940 | return xfs_alert_fsblock_zero(ip, &imap); |
1da177e4 LT |
941 | |
942 | if ((numblks_fsb = imap.br_blockcount) == 0) { | |
943 | /* | |
944 | * The numblks_fsb value should always get | |
945 | * smaller, otherwise the loop is stuck. | |
946 | */ | |
947 | ASSERT(imap.br_blockcount); | |
948 | break; | |
949 | } | |
950 | offset_fsb += numblks_fsb; | |
951 | count_fsb -= numblks_fsb; | |
952 | } while (count_fsb > 0); | |
953 | ||
954 | return 0; | |
955 | ||
956 | error_on_bmapi_transaction: | |
957 | xfs_bmap_cancel(&free_list); | |
4906e215 | 958 | xfs_trans_cancel(tp); |
1da177e4 | 959 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
b474c7ae | 960 | return error; |
1da177e4 | 961 | } |