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Commit | Line | Data |
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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" |
a844f451 | 20 | #include "xfs_bit.h" |
1da177e4 | 21 | #include "xfs_log.h" |
a844f451 | 22 | #include "xfs_inum.h" |
1da177e4 LT |
23 | #include "xfs_trans.h" |
24 | #include "xfs_sb.h" | |
25 | #include "xfs_ag.h" | |
1da177e4 | 26 | #include "xfs_alloc.h" |
1da177e4 LT |
27 | #include "xfs_quota.h" |
28 | #include "xfs_mount.h" | |
1da177e4 | 29 | #include "xfs_bmap_btree.h" |
a844f451 | 30 | #include "xfs_alloc_btree.h" |
1da177e4 | 31 | #include "xfs_ialloc_btree.h" |
1da177e4 LT |
32 | #include "xfs_dinode.h" |
33 | #include "xfs_inode.h" | |
a844f451 | 34 | #include "xfs_btree.h" |
1da177e4 | 35 | #include "xfs_bmap.h" |
1da177e4 LT |
36 | #include "xfs_rtalloc.h" |
37 | #include "xfs_error.h" | |
38 | #include "xfs_itable.h" | |
39 | #include "xfs_rw.h" | |
1da177e4 LT |
40 | #include "xfs_attr.h" |
41 | #include "xfs_buf_item.h" | |
42 | #include "xfs_trans_space.h" | |
43 | #include "xfs_utils.h" | |
44 | #include "xfs_iomap.h" | |
0b1b213f | 45 | #include "xfs_trace.h" |
1da177e4 | 46 | |
1da177e4 LT |
47 | |
48 | #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ | |
49 | << mp->m_writeio_log) | |
1da177e4 LT |
50 | #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP |
51 | ||
dd9f438e NS |
52 | STATIC int |
53 | xfs_iomap_eof_align_last_fsb( | |
54 | xfs_mount_t *mp, | |
541d7d3c | 55 | xfs_inode_t *ip, |
dd9f438e NS |
56 | xfs_extlen_t extsize, |
57 | xfs_fileoff_t *last_fsb) | |
58 | { | |
59 | xfs_fileoff_t new_last_fsb = 0; | |
60 | xfs_extlen_t align; | |
61 | int eof, error; | |
62 | ||
71ddabb9 | 63 | if (XFS_IS_REALTIME_INODE(ip)) |
dd9f438e NS |
64 | ; |
65 | /* | |
66 | * If mounted with the "-o swalloc" option, roundup the allocation | |
67 | * request to a stripe width boundary if the file size is >= | |
68 | * stripe width and we are allocating past the allocation eof. | |
69 | */ | |
70 | else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) && | |
9f6c92b9 | 71 | (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_swidth))) |
dd9f438e NS |
72 | new_last_fsb = roundup_64(*last_fsb, mp->m_swidth); |
73 | /* | |
74 | * Roundup the allocation request to a stripe unit (m_dalign) boundary | |
75 | * if the file size is >= stripe unit size, and we are allocating past | |
76 | * the allocation eof. | |
77 | */ | |
9f6c92b9 | 78 | else if (mp->m_dalign && (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_dalign))) |
dd9f438e NS |
79 | new_last_fsb = roundup_64(*last_fsb, mp->m_dalign); |
80 | ||
81 | /* | |
82 | * Always round up the allocation request to an extent boundary | |
83 | * (when file on a real-time subvolume or has di_extsize hint). | |
84 | */ | |
85 | if (extsize) { | |
86 | if (new_last_fsb) | |
87 | align = roundup_64(new_last_fsb, extsize); | |
88 | else | |
89 | align = extsize; | |
90 | new_last_fsb = roundup_64(*last_fsb, align); | |
91 | } | |
92 | ||
93 | if (new_last_fsb) { | |
541d7d3c | 94 | error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); |
dd9f438e NS |
95 | if (error) |
96 | return error; | |
97 | if (eof) | |
98 | *last_fsb = new_last_fsb; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
572d95f4 | 103 | STATIC int |
6d4a8ecb | 104 | xfs_alert_fsblock_zero( |
572d95f4 NS |
105 | xfs_inode_t *ip, |
106 | xfs_bmbt_irec_t *imap) | |
107 | { | |
6a19d939 | 108 | xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO, |
572d95f4 NS |
109 | "Access to block zero in inode %llu " |
110 | "start_block: %llx start_off: %llx " | |
111 | "blkcnt: %llx extent-state: %x\n", | |
112 | (unsigned long long)ip->i_ino, | |
113 | (unsigned long long)imap->br_startblock, | |
114 | (unsigned long long)imap->br_startoff, | |
115 | (unsigned long long)imap->br_blockcount, | |
116 | imap->br_state); | |
117 | return EFSCORRUPTED; | |
118 | } | |
119 | ||
a206c817 | 120 | int |
1da177e4 LT |
121 | xfs_iomap_write_direct( |
122 | xfs_inode_t *ip, | |
f403b7f4 | 123 | xfs_off_t offset, |
1da177e4 | 124 | size_t count, |
3070451e | 125 | xfs_bmbt_irec_t *imap, |
405f8042 | 126 | int nmaps) |
1da177e4 LT |
127 | { |
128 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
129 | xfs_fileoff_t offset_fsb; |
130 | xfs_fileoff_t last_fsb; | |
dd9f438e | 131 | xfs_filblks_t count_fsb, resaligned; |
1da177e4 | 132 | xfs_fsblock_t firstfsb; |
dd9f438e | 133 | xfs_extlen_t extsz, temp; |
0116d935 | 134 | int nimaps; |
1da177e4 | 135 | int bmapi_flag; |
06d10dd9 | 136 | int quota_flag; |
1da177e4 LT |
137 | int rt; |
138 | xfs_trans_t *tp; | |
1da177e4 | 139 | xfs_bmap_free_t free_list; |
dd9f438e | 140 | uint qblocks, resblks, resrtextents; |
1da177e4 | 141 | int committed; |
dd9f438e | 142 | int error; |
1da177e4 LT |
143 | |
144 | /* | |
145 | * Make sure that the dquots are there. This doesn't hold | |
146 | * the ilock across a disk read. | |
147 | */ | |
7d095257 | 148 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 LT |
149 | if (error) |
150 | return XFS_ERROR(error); | |
151 | ||
dd9f438e | 152 | rt = XFS_IS_REALTIME_INODE(ip); |
957d0ebe | 153 | extsz = xfs_get_extsz_hint(ip); |
1da177e4 | 154 | |
957d0ebe DC |
155 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
156 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
9f6c92b9 LM |
157 | if ((offset + count) > ip->i_size) { |
158 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); | |
dd9f438e NS |
159 | if (error) |
160 | goto error_out; | |
1da177e4 | 161 | } else { |
405f8042 | 162 | if (nmaps && (imap->br_startblock == HOLESTARTBLOCK)) |
dd9f438e | 163 | last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
3070451e CH |
164 | imap->br_blockcount + |
165 | imap->br_startoff); | |
1da177e4 | 166 | } |
dd9f438e NS |
167 | count_fsb = last_fsb - offset_fsb; |
168 | ASSERT(count_fsb > 0); | |
169 | ||
170 | resaligned = count_fsb; | |
171 | if (unlikely(extsz)) { | |
172 | if ((temp = do_mod(offset_fsb, extsz))) | |
173 | resaligned += temp; | |
174 | if ((temp = do_mod(resaligned, extsz))) | |
175 | resaligned += extsz - temp; | |
176 | } | |
177 | ||
178 | if (unlikely(rt)) { | |
179 | resrtextents = qblocks = resaligned; | |
180 | resrtextents /= mp->m_sb.sb_rextsize; | |
84e1e99f DC |
181 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
182 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
183 | } else { | |
184 | resrtextents = 0; | |
dd9f438e | 185 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
84e1e99f DC |
186 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
187 | } | |
1da177e4 LT |
188 | |
189 | /* | |
06d10dd9 | 190 | * Allocate and setup the transaction |
1da177e4 LT |
191 | */ |
192 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
193 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
1da177e4 | 194 | error = xfs_trans_reserve(tp, resblks, |
d52b44d0 | 195 | XFS_WRITE_LOG_RES(mp), resrtextents, |
1da177e4 LT |
196 | XFS_TRANS_PERM_LOG_RES, |
197 | XFS_WRITE_LOG_COUNT); | |
1da177e4 | 198 | /* |
06d10dd9 | 199 | * Check for running out of space, note: need lock to return |
1da177e4 LT |
200 | */ |
201 | if (error) | |
1da177e4 | 202 | xfs_trans_cancel(tp, 0); |
1da177e4 | 203 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 204 | if (error) |
06d10dd9 | 205 | goto error_out; |
1da177e4 | 206 | |
7d095257 | 207 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
dd9f438e | 208 | if (error) |
1da177e4 | 209 | goto error1; |
1da177e4 | 210 | |
898621d5 | 211 | xfs_trans_ijoin(tp, ip); |
1da177e4 | 212 | |
c0dc7828 | 213 | bmapi_flag = 0; |
405f8042 | 214 | if (offset < ip->i_size || extsz) |
1da177e4 LT |
215 | bmapi_flag |= XFS_BMAPI_PREALLOC; |
216 | ||
217 | /* | |
3070451e CH |
218 | * From this point onwards we overwrite the imap pointer that the |
219 | * caller gave to us. | |
1da177e4 | 220 | */ |
9d87c319 | 221 | xfs_bmap_init(&free_list, &firstfsb); |
06d10dd9 | 222 | nimaps = 1; |
c0dc7828 DC |
223 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flag, |
224 | &firstfsb, 0, imap, &nimaps, &free_list); | |
06d10dd9 | 225 | if (error) |
1da177e4 | 226 | goto error0; |
1da177e4 LT |
227 | |
228 | /* | |
06d10dd9 | 229 | * Complete the transaction |
1da177e4 | 230 | */ |
f7c99b6f | 231 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
06d10dd9 | 232 | if (error) |
1da177e4 | 233 | goto error0; |
1c72bf90 | 234 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
06d10dd9 | 235 | if (error) |
1da177e4 | 236 | goto error_out; |
1da177e4 | 237 | |
06d10dd9 NS |
238 | /* |
239 | * Copy any maps to caller's array and return any error. | |
240 | */ | |
1da177e4 | 241 | if (nimaps == 0) { |
572d95f4 NS |
242 | error = ENOSPC; |
243 | goto error_out; | |
244 | } | |
245 | ||
3070451e | 246 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) { |
6d4a8ecb | 247 | error = xfs_alert_fsblock_zero(ip, imap); |
1da177e4 LT |
248 | goto error_out; |
249 | } | |
250 | ||
1da177e4 LT |
251 | return 0; |
252 | ||
06d10dd9 | 253 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ |
1da177e4 | 254 | xfs_bmap_cancel(&free_list); |
7d095257 | 255 | xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
1da177e4 | 256 | |
06d10dd9 | 257 | error1: /* Just cancel transaction */ |
1da177e4 | 258 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); |
1da177e4 LT |
259 | |
260 | error_out: | |
261 | return XFS_ERROR(error); | |
262 | } | |
263 | ||
dd9f438e | 264 | /* |
8de2bf93 DC |
265 | * If the caller is doing a write at the end of the file, then extend the |
266 | * allocation out to the file system's write iosize. We clean up any extra | |
267 | * space left over when the file is closed in xfs_inactive(). | |
055388a3 DC |
268 | * |
269 | * If we find we already have delalloc preallocation beyond EOF, don't do more | |
270 | * preallocation as it it not needed. | |
dd9f438e NS |
271 | */ |
272 | STATIC int | |
273 | xfs_iomap_eof_want_preallocate( | |
274 | xfs_mount_t *mp, | |
541d7d3c | 275 | xfs_inode_t *ip, |
dd9f438e NS |
276 | xfs_off_t offset, |
277 | size_t count, | |
dd9f438e NS |
278 | xfs_bmbt_irec_t *imap, |
279 | int nimaps, | |
280 | int *prealloc) | |
281 | { | |
282 | xfs_fileoff_t start_fsb; | |
283 | xfs_filblks_t count_fsb; | |
284 | xfs_fsblock_t firstblock; | |
285 | int n, error, imaps; | |
055388a3 | 286 | int found_delalloc = 0; |
dd9f438e NS |
287 | |
288 | *prealloc = 0; | |
8de2bf93 | 289 | if ((offset + count) <= ip->i_size) |
dd9f438e NS |
290 | return 0; |
291 | ||
292 | /* | |
293 | * If there are any real blocks past eof, then don't | |
294 | * do any speculative allocation. | |
295 | */ | |
296 | start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); | |
297 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); | |
298 | while (count_fsb > 0) { | |
299 | imaps = nimaps; | |
3ddb8fa9 | 300 | firstblock = NULLFSBLOCK; |
5c8ed202 DC |
301 | error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps, |
302 | 0); | |
dd9f438e NS |
303 | if (error) |
304 | return error; | |
305 | for (n = 0; n < imaps; n++) { | |
306 | if ((imap[n].br_startblock != HOLESTARTBLOCK) && | |
307 | (imap[n].br_startblock != DELAYSTARTBLOCK)) | |
308 | return 0; | |
309 | start_fsb += imap[n].br_blockcount; | |
310 | count_fsb -= imap[n].br_blockcount; | |
055388a3 DC |
311 | |
312 | if (imap[n].br_startblock == DELAYSTARTBLOCK) | |
313 | found_delalloc = 1; | |
dd9f438e NS |
314 | } |
315 | } | |
055388a3 DC |
316 | if (!found_delalloc) |
317 | *prealloc = 1; | |
dd9f438e NS |
318 | return 0; |
319 | } | |
320 | ||
055388a3 DC |
321 | /* |
322 | * If we don't have a user specified preallocation size, dynamically increase | |
323 | * the preallocation size as the size of the file grows. Cap the maximum size | |
324 | * at a single extent or less if the filesystem is near full. The closer the | |
325 | * filesystem is to full, the smaller the maximum prealocation. | |
326 | */ | |
327 | STATIC xfs_fsblock_t | |
328 | xfs_iomap_prealloc_size( | |
329 | struct xfs_mount *mp, | |
330 | struct xfs_inode *ip) | |
331 | { | |
332 | xfs_fsblock_t alloc_blocks = 0; | |
333 | ||
334 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { | |
335 | int shift = 0; | |
336 | int64_t freesp; | |
337 | ||
b8fc8263 DC |
338 | /* |
339 | * rounddown_pow_of_two() returns an undefined result | |
340 | * if we pass in alloc_blocks = 0. Hence the "+ 1" to | |
341 | * ensure we always pass in a non-zero value. | |
342 | */ | |
343 | alloc_blocks = XFS_B_TO_FSB(mp, ip->i_size) + 1; | |
055388a3 DC |
344 | alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN, |
345 | rounddown_pow_of_two(alloc_blocks)); | |
346 | ||
347 | xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); | |
348 | freesp = mp->m_sb.sb_fdblocks; | |
349 | if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) { | |
350 | shift = 2; | |
351 | if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT]) | |
352 | shift++; | |
353 | if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT]) | |
354 | shift++; | |
355 | if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT]) | |
356 | shift++; | |
357 | if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT]) | |
358 | shift++; | |
359 | } | |
360 | if (shift) | |
361 | alloc_blocks >>= shift; | |
362 | } | |
363 | ||
364 | if (alloc_blocks < mp->m_writeio_blocks) | |
365 | alloc_blocks = mp->m_writeio_blocks; | |
366 | ||
367 | return alloc_blocks; | |
368 | } | |
369 | ||
a206c817 | 370 | int |
1da177e4 LT |
371 | xfs_iomap_write_delay( |
372 | xfs_inode_t *ip, | |
f403b7f4 | 373 | xfs_off_t offset, |
1da177e4 | 374 | size_t count, |
405f8042 | 375 | xfs_bmbt_irec_t *ret_imap) |
1da177e4 LT |
376 | { |
377 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
378 | xfs_fileoff_t offset_fsb; |
379 | xfs_fileoff_t last_fsb; | |
dd9f438e NS |
380 | xfs_off_t aligned_offset; |
381 | xfs_fileoff_t ioalign; | |
dd9f438e | 382 | xfs_extlen_t extsz; |
1da177e4 | 383 | int nimaps; |
1da177e4 | 384 | xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; |
8de2bf93 | 385 | int prealloc, flushed = 0; |
dd9f438e | 386 | int error; |
1da177e4 | 387 | |
579aa9ca | 388 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 LT |
389 | |
390 | /* | |
391 | * Make sure that the dquots are there. This doesn't hold | |
392 | * the ilock across a disk read. | |
393 | */ | |
7d095257 | 394 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 LT |
395 | if (error) |
396 | return XFS_ERROR(error); | |
397 | ||
957d0ebe | 398 | extsz = xfs_get_extsz_hint(ip); |
dd9f438e NS |
399 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
400 | ||
055388a3 | 401 | |
9f6c92b9 | 402 | error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, |
405f8042 | 403 | imap, XFS_WRITE_IMAPS, &prealloc); |
dd9f438e NS |
404 | if (error) |
405 | return error; | |
1da177e4 | 406 | |
8de2bf93 | 407 | retry: |
dd9f438e | 408 | if (prealloc) { |
055388a3 DC |
409 | xfs_fsblock_t alloc_blocks = xfs_iomap_prealloc_size(mp, ip); |
410 | ||
1da177e4 LT |
411 | aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); |
412 | ioalign = XFS_B_TO_FSBT(mp, aligned_offset); | |
055388a3 | 413 | last_fsb = ioalign + alloc_blocks; |
dd9f438e NS |
414 | } else { |
415 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
1da177e4 | 416 | } |
1da177e4 | 417 | |
dd9f438e | 418 | if (prealloc || extsz) { |
9f6c92b9 | 419 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e | 420 | if (error) |
1da177e4 | 421 | return error; |
1da177e4 | 422 | } |
dd9f438e NS |
423 | |
424 | nimaps = XFS_WRITE_IMAPS; | |
4403280a CH |
425 | error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb, |
426 | imap, &nimaps, XFS_BMAPI_ENTIRE); | |
055388a3 DC |
427 | switch (error) { |
428 | case 0: | |
429 | case ENOSPC: | |
430 | case EDQUOT: | |
431 | break; | |
432 | default: | |
1da177e4 | 433 | return XFS_ERROR(error); |
055388a3 | 434 | } |
dd9f438e | 435 | |
1da177e4 | 436 | /* |
055388a3 DC |
437 | * If bmapi returned us nothing, we got either ENOSPC or EDQUOT. For |
438 | * ENOSPC, * flush all other inodes with delalloc blocks to free up | |
439 | * some of the excess reserved metadata space. For both cases, retry | |
440 | * without EOF preallocation. | |
1da177e4 LT |
441 | */ |
442 | if (nimaps == 0) { | |
0b1b213f | 443 | trace_xfs_delalloc_enospc(ip, offset, count); |
8de2bf93 | 444 | if (flushed) |
055388a3 | 445 | return XFS_ERROR(error ? error : ENOSPC); |
1da177e4 | 446 | |
055388a3 DC |
447 | if (error == ENOSPC) { |
448 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
449 | xfs_flush_inodes(ip); | |
450 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
451 | } | |
8de2bf93 DC |
452 | |
453 | flushed = 1; | |
1da177e4 | 454 | error = 0; |
8de2bf93 | 455 | prealloc = 0; |
1da177e4 LT |
456 | goto retry; |
457 | } | |
458 | ||
86c4d623 | 459 | if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 460 | return xfs_alert_fsblock_zero(ip, &imap[0]); |
dd9f438e NS |
461 | |
462 | *ret_imap = imap[0]; | |
1da177e4 LT |
463 | return 0; |
464 | } | |
465 | ||
466 | /* | |
467 | * Pass in a delayed allocate extent, convert it to real extents; | |
468 | * return to the caller the extent we create which maps on top of | |
469 | * the originating callers request. | |
470 | * | |
471 | * Called without a lock on the inode. | |
e4143a1c DC |
472 | * |
473 | * We no longer bother to look at the incoming map - all we have to | |
474 | * guarantee is that whatever we allocate fills the required range. | |
1da177e4 | 475 | */ |
a206c817 | 476 | int |
1da177e4 LT |
477 | xfs_iomap_write_allocate( |
478 | xfs_inode_t *ip, | |
f403b7f4 | 479 | xfs_off_t offset, |
24e17b5f | 480 | size_t count, |
405f8042 | 481 | xfs_bmbt_irec_t *imap) |
1da177e4 LT |
482 | { |
483 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
484 | xfs_fileoff_t offset_fsb, last_block; |
485 | xfs_fileoff_t end_fsb, map_start_fsb; | |
486 | xfs_fsblock_t first_block; | |
487 | xfs_bmap_free_t free_list; | |
488 | xfs_filblks_t count_fsb; | |
1da177e4 | 489 | xfs_trans_t *tp; |
e4143a1c | 490 | int nimaps, committed; |
1da177e4 LT |
491 | int error = 0; |
492 | int nres; | |
493 | ||
1da177e4 LT |
494 | /* |
495 | * Make sure that the dquots are there. | |
496 | */ | |
7d095257 CH |
497 | error = xfs_qm_dqattach(ip, 0); |
498 | if (error) | |
1da177e4 LT |
499 | return XFS_ERROR(error); |
500 | ||
24e17b5f | 501 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
3070451e CH |
502 | count_fsb = imap->br_blockcount; |
503 | map_start_fsb = imap->br_startoff; | |
1da177e4 LT |
504 | |
505 | XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); | |
506 | ||
507 | while (count_fsb != 0) { | |
508 | /* | |
509 | * Set up a transaction with which to allocate the | |
510 | * backing store for the file. Do allocations in a | |
511 | * loop until we get some space in the range we are | |
512 | * interested in. The other space that might be allocated | |
513 | * is in the delayed allocation extent on which we sit | |
514 | * but before our buffer starts. | |
515 | */ | |
516 | ||
517 | nimaps = 0; | |
518 | while (nimaps == 0) { | |
519 | tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); | |
84e1e99f | 520 | tp->t_flags |= XFS_TRANS_RESERVE; |
1da177e4 LT |
521 | nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); |
522 | error = xfs_trans_reserve(tp, nres, | |
523 | XFS_WRITE_LOG_RES(mp), | |
524 | 0, XFS_TRANS_PERM_LOG_RES, | |
525 | XFS_WRITE_LOG_COUNT); | |
1da177e4 LT |
526 | if (error) { |
527 | xfs_trans_cancel(tp, 0); | |
528 | return XFS_ERROR(error); | |
529 | } | |
530 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
898621d5 | 531 | xfs_trans_ijoin(tp, ip); |
1da177e4 | 532 | |
9d87c319 | 533 | xfs_bmap_init(&free_list, &first_block); |
1da177e4 | 534 | |
1da177e4 | 535 | /* |
e4143a1c DC |
536 | * it is possible that the extents have changed since |
537 | * we did the read call as we dropped the ilock for a | |
538 | * while. We have to be careful about truncates or hole | |
539 | * punchs here - we are not allowed to allocate | |
540 | * non-delalloc blocks here. | |
541 | * | |
542 | * The only protection against truncation is the pages | |
543 | * for the range we are being asked to convert are | |
544 | * locked and hence a truncate will block on them | |
545 | * first. | |
546 | * | |
547 | * As a result, if we go beyond the range we really | |
548 | * need and hit an delalloc extent boundary followed by | |
549 | * a hole while we have excess blocks in the map, we | |
550 | * will fill the hole incorrectly and overrun the | |
551 | * transaction reservation. | |
552 | * | |
553 | * Using a single map prevents this as we are forced to | |
554 | * check each map we look for overlap with the desired | |
555 | * range and abort as soon as we find it. Also, given | |
556 | * that we only return a single map, having one beyond | |
557 | * what we can return is probably a bit silly. | |
558 | * | |
559 | * We also need to check that we don't go beyond EOF; | |
560 | * this is a truncate optimisation as a truncate sets | |
561 | * the new file size before block on the pages we | |
562 | * currently have locked under writeback. Because they | |
563 | * are about to be tossed, we don't need to write them | |
564 | * back.... | |
1da177e4 | 565 | */ |
e4143a1c | 566 | nimaps = 1; |
ba87ea69 | 567 | end_fsb = XFS_B_TO_FSB(mp, ip->i_size); |
7c9ef85c DC |
568 | error = xfs_bmap_last_offset(NULL, ip, &last_block, |
569 | XFS_DATA_FORK); | |
570 | if (error) | |
571 | goto trans_cancel; | |
572 | ||
1da177e4 LT |
573 | last_block = XFS_FILEOFF_MAX(last_block, end_fsb); |
574 | if ((map_start_fsb + count_fsb) > last_block) { | |
575 | count_fsb = last_block - map_start_fsb; | |
576 | if (count_fsb == 0) { | |
577 | error = EAGAIN; | |
578 | goto trans_cancel; | |
579 | } | |
580 | } | |
581 | ||
3070451e | 582 | /* |
3070451e CH |
583 | * From this point onwards we overwrite the imap |
584 | * pointer that the caller gave to us. | |
585 | */ | |
c0dc7828 DC |
586 | error = xfs_bmapi_write(tp, ip, map_start_fsb, |
587 | count_fsb, 0, &first_block, 1, | |
588 | imap, &nimaps, &free_list); | |
1da177e4 LT |
589 | if (error) |
590 | goto trans_cancel; | |
591 | ||
f7c99b6f | 592 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
1da177e4 LT |
593 | if (error) |
594 | goto trans_cancel; | |
595 | ||
1c72bf90 | 596 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
597 | if (error) |
598 | goto error0; | |
599 | ||
600 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
601 | } | |
602 | ||
603 | /* | |
604 | * See if we were able to allocate an extent that | |
605 | * covers at least part of the callers request | |
606 | */ | |
3070451e | 607 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 608 | return xfs_alert_fsblock_zero(ip, imap); |
86c4d623 | 609 | |
3070451e CH |
610 | if ((offset_fsb >= imap->br_startoff) && |
611 | (offset_fsb < (imap->br_startoff + | |
612 | imap->br_blockcount))) { | |
e4143a1c DC |
613 | XFS_STATS_INC(xs_xstrat_quick); |
614 | return 0; | |
1da177e4 LT |
615 | } |
616 | ||
e4143a1c DC |
617 | /* |
618 | * So far we have not mapped the requested part of the | |
1da177e4 LT |
619 | * file, just surrounding data, try again. |
620 | */ | |
3070451e CH |
621 | count_fsb -= imap->br_blockcount; |
622 | map_start_fsb = imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
623 | } |
624 | ||
625 | trans_cancel: | |
626 | xfs_bmap_cancel(&free_list); | |
627 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
628 | error0: | |
629 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
630 | return XFS_ERROR(error); | |
631 | } | |
632 | ||
633 | int | |
634 | xfs_iomap_write_unwritten( | |
635 | xfs_inode_t *ip, | |
f403b7f4 | 636 | xfs_off_t offset, |
1da177e4 LT |
637 | size_t count) |
638 | { | |
639 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
640 | xfs_fileoff_t offset_fsb; |
641 | xfs_filblks_t count_fsb; | |
642 | xfs_filblks_t numblks_fsb; | |
dd9f438e NS |
643 | xfs_fsblock_t firstfsb; |
644 | int nimaps; | |
645 | xfs_trans_t *tp; | |
646 | xfs_bmbt_irec_t imap; | |
647 | xfs_bmap_free_t free_list; | |
648 | uint resblks; | |
1da177e4 LT |
649 | int committed; |
650 | int error; | |
1da177e4 | 651 | |
0b1b213f | 652 | trace_xfs_unwritten_convert(ip, offset, count); |
1da177e4 LT |
653 | |
654 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
655 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
656 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); | |
657 | ||
4ddd8bb1 LM |
658 | /* |
659 | * Reserve enough blocks in this transaction for two complete extent | |
660 | * btree splits. We may be converting the middle part of an unwritten | |
661 | * extent and in this case we will insert two new extents in the btree | |
662 | * each of which could cause a full split. | |
663 | * | |
664 | * This reservation amount will be used in the first call to | |
665 | * xfs_bmbt_split() to select an AG with enough space to satisfy the | |
666 | * rest of the operation. | |
667 | */ | |
dd9f438e | 668 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
1da177e4 | 669 | |
dd9f438e | 670 | do { |
1da177e4 LT |
671 | /* |
672 | * set up a transaction to convert the range of extents | |
673 | * from unwritten to real. Do allocations in a loop until | |
674 | * we have covered the range passed in. | |
80641dc6 CH |
675 | * |
676 | * Note that we open code the transaction allocation here | |
677 | * to pass KM_NOFS--we can't risk to recursing back into | |
678 | * the filesystem here as we might be asked to write out | |
679 | * the same inode that we complete here and might deadlock | |
680 | * on the iolock. | |
1da177e4 | 681 | */ |
80641dc6 CH |
682 | xfs_wait_for_freeze(mp, SB_FREEZE_TRANS); |
683 | tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS); | |
84e1e99f | 684 | tp->t_flags |= XFS_TRANS_RESERVE; |
dd9f438e | 685 | error = xfs_trans_reserve(tp, resblks, |
1da177e4 LT |
686 | XFS_WRITE_LOG_RES(mp), 0, |
687 | XFS_TRANS_PERM_LOG_RES, | |
688 | XFS_WRITE_LOG_COUNT); | |
689 | if (error) { | |
690 | xfs_trans_cancel(tp, 0); | |
572d95f4 | 691 | return XFS_ERROR(error); |
1da177e4 LT |
692 | } |
693 | ||
694 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
898621d5 | 695 | xfs_trans_ijoin(tp, ip); |
1da177e4 LT |
696 | |
697 | /* | |
698 | * Modify the unwritten extent state of the buffer. | |
699 | */ | |
9d87c319 | 700 | xfs_bmap_init(&free_list, &firstfsb); |
1da177e4 | 701 | nimaps = 1; |
c0dc7828 DC |
702 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
703 | XFS_BMAPI_CONVERT, &firstfsb, | |
b4e9181e | 704 | 1, &imap, &nimaps, &free_list); |
1da177e4 LT |
705 | if (error) |
706 | goto error_on_bmapi_transaction; | |
707 | ||
f7c99b6f | 708 | error = xfs_bmap_finish(&(tp), &(free_list), &committed); |
1da177e4 LT |
709 | if (error) |
710 | goto error_on_bmapi_transaction; | |
711 | ||
1c72bf90 | 712 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
713 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
714 | if (error) | |
572d95f4 NS |
715 | return XFS_ERROR(error); |
716 | ||
86c4d623 | 717 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 718 | return xfs_alert_fsblock_zero(ip, &imap); |
1da177e4 LT |
719 | |
720 | if ((numblks_fsb = imap.br_blockcount) == 0) { | |
721 | /* | |
722 | * The numblks_fsb value should always get | |
723 | * smaller, otherwise the loop is stuck. | |
724 | */ | |
725 | ASSERT(imap.br_blockcount); | |
726 | break; | |
727 | } | |
728 | offset_fsb += numblks_fsb; | |
729 | count_fsb -= numblks_fsb; | |
730 | } while (count_fsb > 0); | |
731 | ||
732 | return 0; | |
733 | ||
734 | error_on_bmapi_transaction: | |
735 | xfs_bmap_cancel(&free_list); | |
736 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); | |
737 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1da177e4 LT |
738 | return XFS_ERROR(error); |
739 | } |