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" |
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" | |
84803fb7 | 34 | #include "xfs_inode_item.h" |
a844f451 | 35 | #include "xfs_btree.h" |
1da177e4 | 36 | #include "xfs_bmap.h" |
1da177e4 LT |
37 | #include "xfs_rtalloc.h" |
38 | #include "xfs_error.h" | |
39 | #include "xfs_itable.h" | |
40 | #include "xfs_rw.h" | |
1da177e4 LT |
41 | #include "xfs_attr.h" |
42 | #include "xfs_buf_item.h" | |
43 | #include "xfs_trans_space.h" | |
44 | #include "xfs_utils.h" | |
45 | #include "xfs_iomap.h" | |
0b1b213f | 46 | #include "xfs_trace.h" |
1da177e4 | 47 | |
1da177e4 LT |
48 | |
49 | #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ | |
50 | << mp->m_writeio_log) | |
1da177e4 LT |
51 | #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP |
52 | ||
dd9f438e NS |
53 | STATIC int |
54 | xfs_iomap_eof_align_last_fsb( | |
55 | xfs_mount_t *mp, | |
541d7d3c | 56 | xfs_inode_t *ip, |
dd9f438e NS |
57 | xfs_extlen_t extsize, |
58 | xfs_fileoff_t *last_fsb) | |
59 | { | |
60 | xfs_fileoff_t new_last_fsb = 0; | |
bf322d98 | 61 | xfs_extlen_t align = 0; |
dd9f438e NS |
62 | int eof, error; |
63 | ||
bf322d98 CH |
64 | if (!XFS_IS_REALTIME_INODE(ip)) { |
65 | /* | |
66 | * Round up the allocation request to a stripe unit | |
67 | * (m_dalign) boundary if the file size is >= stripe unit | |
68 | * size, and we are allocating past the allocation eof. | |
69 | * | |
70 | * If mounted with the "-o swalloc" option the alignment is | |
71 | * increased from the strip unit size to the stripe width. | |
72 | */ | |
73 | if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC)) | |
74 | align = mp->m_swidth; | |
75 | else if (mp->m_dalign) | |
76 | align = mp->m_dalign; | |
77 | ||
ce7ae151 | 78 | if (align && XFS_ISIZE(ip) >= XFS_FSB_TO_B(mp, align)) |
bf322d98 CH |
79 | new_last_fsb = roundup_64(*last_fsb, align); |
80 | } | |
dd9f438e NS |
81 | |
82 | /* | |
83 | * Always round up the allocation request to an extent boundary | |
84 | * (when file on a real-time subvolume or has di_extsize hint). | |
85 | */ | |
86 | if (extsize) { | |
87 | if (new_last_fsb) | |
88 | align = roundup_64(new_last_fsb, extsize); | |
89 | else | |
90 | align = extsize; | |
91 | new_last_fsb = roundup_64(*last_fsb, align); | |
92 | } | |
93 | ||
94 | if (new_last_fsb) { | |
541d7d3c | 95 | error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); |
dd9f438e NS |
96 | if (error) |
97 | return error; | |
98 | if (eof) | |
99 | *last_fsb = new_last_fsb; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
572d95f4 | 104 | STATIC int |
6d4a8ecb | 105 | xfs_alert_fsblock_zero( |
572d95f4 NS |
106 | xfs_inode_t *ip, |
107 | xfs_bmbt_irec_t *imap) | |
108 | { | |
6a19d939 | 109 | xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO, |
572d95f4 NS |
110 | "Access to block zero in inode %llu " |
111 | "start_block: %llx start_off: %llx " | |
112 | "blkcnt: %llx extent-state: %x\n", | |
113 | (unsigned long long)ip->i_ino, | |
114 | (unsigned long long)imap->br_startblock, | |
115 | (unsigned long long)imap->br_startoff, | |
116 | (unsigned long long)imap->br_blockcount, | |
117 | imap->br_state); | |
118 | return EFSCORRUPTED; | |
119 | } | |
120 | ||
a206c817 | 121 | int |
1da177e4 LT |
122 | xfs_iomap_write_direct( |
123 | xfs_inode_t *ip, | |
f403b7f4 | 124 | xfs_off_t offset, |
1da177e4 | 125 | size_t count, |
3070451e | 126 | xfs_bmbt_irec_t *imap, |
405f8042 | 127 | int nmaps) |
1da177e4 LT |
128 | { |
129 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
130 | xfs_fileoff_t offset_fsb; |
131 | xfs_fileoff_t last_fsb; | |
dd9f438e | 132 | xfs_filblks_t count_fsb, resaligned; |
1da177e4 | 133 | xfs_fsblock_t firstfsb; |
dd9f438e | 134 | xfs_extlen_t extsz, temp; |
0116d935 | 135 | int nimaps; |
1da177e4 | 136 | int bmapi_flag; |
06d10dd9 | 137 | int quota_flag; |
1da177e4 LT |
138 | int rt; |
139 | xfs_trans_t *tp; | |
1da177e4 | 140 | xfs_bmap_free_t free_list; |
dd9f438e | 141 | uint qblocks, resblks, resrtextents; |
1da177e4 | 142 | int committed; |
dd9f438e | 143 | int error; |
1da177e4 LT |
144 | |
145 | /* | |
146 | * Make sure that the dquots are there. This doesn't hold | |
147 | * the ilock across a disk read. | |
148 | */ | |
7d095257 | 149 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 LT |
150 | if (error) |
151 | return XFS_ERROR(error); | |
152 | ||
dd9f438e | 153 | rt = XFS_IS_REALTIME_INODE(ip); |
957d0ebe | 154 | extsz = xfs_get_extsz_hint(ip); |
1da177e4 | 155 | |
957d0ebe DC |
156 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
157 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
ce7ae151 | 158 | if ((offset + count) > XFS_ISIZE(ip)) { |
9f6c92b9 | 159 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e NS |
160 | if (error) |
161 | goto error_out; | |
1da177e4 | 162 | } else { |
405f8042 | 163 | if (nmaps && (imap->br_startblock == HOLESTARTBLOCK)) |
dd9f438e | 164 | last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
3070451e CH |
165 | imap->br_blockcount + |
166 | imap->br_startoff); | |
1da177e4 | 167 | } |
dd9f438e NS |
168 | count_fsb = last_fsb - offset_fsb; |
169 | ASSERT(count_fsb > 0); | |
170 | ||
171 | resaligned = count_fsb; | |
172 | if (unlikely(extsz)) { | |
173 | if ((temp = do_mod(offset_fsb, extsz))) | |
174 | resaligned += temp; | |
175 | if ((temp = do_mod(resaligned, extsz))) | |
176 | resaligned += extsz - temp; | |
177 | } | |
178 | ||
179 | if (unlikely(rt)) { | |
180 | resrtextents = qblocks = resaligned; | |
181 | resrtextents /= mp->m_sb.sb_rextsize; | |
84e1e99f DC |
182 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
183 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
184 | } else { | |
185 | resrtextents = 0; | |
dd9f438e | 186 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
84e1e99f DC |
187 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
188 | } | |
1da177e4 LT |
189 | |
190 | /* | |
06d10dd9 | 191 | * Allocate and setup the transaction |
1da177e4 LT |
192 | */ |
193 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
194 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
1da177e4 | 195 | error = xfs_trans_reserve(tp, resblks, |
d52b44d0 | 196 | XFS_WRITE_LOG_RES(mp), resrtextents, |
1da177e4 LT |
197 | XFS_TRANS_PERM_LOG_RES, |
198 | XFS_WRITE_LOG_COUNT); | |
1da177e4 | 199 | /* |
06d10dd9 | 200 | * Check for running out of space, note: need lock to return |
1da177e4 LT |
201 | */ |
202 | if (error) | |
1da177e4 | 203 | xfs_trans_cancel(tp, 0); |
1da177e4 | 204 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 205 | if (error) |
06d10dd9 | 206 | goto error_out; |
1da177e4 | 207 | |
7d095257 | 208 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
dd9f438e | 209 | if (error) |
1da177e4 | 210 | goto error1; |
1da177e4 | 211 | |
ddc3415a | 212 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 213 | |
c0dc7828 | 214 | bmapi_flag = 0; |
ce7ae151 | 215 | if (offset < XFS_ISIZE(ip) || extsz) |
1da177e4 LT |
216 | bmapi_flag |= XFS_BMAPI_PREALLOC; |
217 | ||
218 | /* | |
3070451e CH |
219 | * From this point onwards we overwrite the imap pointer that the |
220 | * caller gave to us. | |
1da177e4 | 221 | */ |
9d87c319 | 222 | xfs_bmap_init(&free_list, &firstfsb); |
06d10dd9 | 223 | nimaps = 1; |
c0dc7828 DC |
224 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flag, |
225 | &firstfsb, 0, imap, &nimaps, &free_list); | |
06d10dd9 | 226 | if (error) |
1da177e4 | 227 | goto error0; |
1da177e4 LT |
228 | |
229 | /* | |
06d10dd9 | 230 | * Complete the transaction |
1da177e4 | 231 | */ |
f7c99b6f | 232 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
06d10dd9 | 233 | if (error) |
1da177e4 | 234 | goto error0; |
1c72bf90 | 235 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
06d10dd9 | 236 | if (error) |
1da177e4 | 237 | goto error_out; |
1da177e4 | 238 | |
06d10dd9 NS |
239 | /* |
240 | * Copy any maps to caller's array and return any error. | |
241 | */ | |
1da177e4 | 242 | if (nimaps == 0) { |
572d95f4 NS |
243 | error = ENOSPC; |
244 | goto error_out; | |
245 | } | |
246 | ||
3070451e | 247 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) { |
6d4a8ecb | 248 | error = xfs_alert_fsblock_zero(ip, imap); |
1da177e4 LT |
249 | goto error_out; |
250 | } | |
251 | ||
1da177e4 LT |
252 | return 0; |
253 | ||
06d10dd9 | 254 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ |
1da177e4 | 255 | xfs_bmap_cancel(&free_list); |
7d095257 | 256 | xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
1da177e4 | 257 | |
06d10dd9 | 258 | error1: /* Just cancel transaction */ |
1da177e4 | 259 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); |
1da177e4 LT |
260 | |
261 | error_out: | |
262 | return XFS_ERROR(error); | |
263 | } | |
264 | ||
dd9f438e | 265 | /* |
8de2bf93 DC |
266 | * If the caller is doing a write at the end of the file, then extend the |
267 | * allocation out to the file system's write iosize. We clean up any extra | |
268 | * space left over when the file is closed in xfs_inactive(). | |
055388a3 DC |
269 | * |
270 | * If we find we already have delalloc preallocation beyond EOF, don't do more | |
271 | * preallocation as it it not needed. | |
dd9f438e NS |
272 | */ |
273 | STATIC int | |
274 | xfs_iomap_eof_want_preallocate( | |
275 | xfs_mount_t *mp, | |
541d7d3c | 276 | xfs_inode_t *ip, |
dd9f438e NS |
277 | xfs_off_t offset, |
278 | size_t count, | |
dd9f438e NS |
279 | xfs_bmbt_irec_t *imap, |
280 | int nimaps, | |
281 | int *prealloc) | |
282 | { | |
283 | xfs_fileoff_t start_fsb; | |
284 | xfs_filblks_t count_fsb; | |
285 | xfs_fsblock_t firstblock; | |
286 | int n, error, imaps; | |
055388a3 | 287 | int found_delalloc = 0; |
dd9f438e NS |
288 | |
289 | *prealloc = 0; | |
ce7ae151 | 290 | if (offset + count <= XFS_ISIZE(ip)) |
dd9f438e NS |
291 | return 0; |
292 | ||
293 | /* | |
294 | * If there are any real blocks past eof, then don't | |
295 | * do any speculative allocation. | |
296 | */ | |
297 | start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); | |
298 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); | |
299 | while (count_fsb > 0) { | |
300 | imaps = nimaps; | |
3ddb8fa9 | 301 | firstblock = NULLFSBLOCK; |
5c8ed202 DC |
302 | error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps, |
303 | 0); | |
dd9f438e NS |
304 | if (error) |
305 | return error; | |
306 | for (n = 0; n < imaps; n++) { | |
307 | if ((imap[n].br_startblock != HOLESTARTBLOCK) && | |
308 | (imap[n].br_startblock != DELAYSTARTBLOCK)) | |
309 | return 0; | |
310 | start_fsb += imap[n].br_blockcount; | |
311 | count_fsb -= imap[n].br_blockcount; | |
055388a3 DC |
312 | |
313 | if (imap[n].br_startblock == DELAYSTARTBLOCK) | |
314 | found_delalloc = 1; | |
dd9f438e NS |
315 | } |
316 | } | |
055388a3 DC |
317 | if (!found_delalloc) |
318 | *prealloc = 1; | |
dd9f438e NS |
319 | return 0; |
320 | } | |
321 | ||
055388a3 DC |
322 | /* |
323 | * If we don't have a user specified preallocation size, dynamically increase | |
324 | * the preallocation size as the size of the file grows. Cap the maximum size | |
325 | * at a single extent or less if the filesystem is near full. The closer the | |
326 | * filesystem is to full, the smaller the maximum prealocation. | |
327 | */ | |
328 | STATIC xfs_fsblock_t | |
329 | xfs_iomap_prealloc_size( | |
330 | struct xfs_mount *mp, | |
331 | struct xfs_inode *ip) | |
332 | { | |
333 | xfs_fsblock_t alloc_blocks = 0; | |
334 | ||
335 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { | |
336 | int shift = 0; | |
337 | int64_t freesp; | |
338 | ||
b8fc8263 DC |
339 | /* |
340 | * rounddown_pow_of_two() returns an undefined result | |
341 | * if we pass in alloc_blocks = 0. Hence the "+ 1" to | |
342 | * ensure we always pass in a non-zero value. | |
343 | */ | |
ce7ae151 | 344 | alloc_blocks = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)) + 1; |
055388a3 DC |
345 | alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN, |
346 | rounddown_pow_of_two(alloc_blocks)); | |
347 | ||
348 | xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); | |
349 | freesp = mp->m_sb.sb_fdblocks; | |
350 | if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) { | |
351 | shift = 2; | |
352 | if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT]) | |
353 | shift++; | |
354 | if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT]) | |
355 | shift++; | |
356 | if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT]) | |
357 | shift++; | |
358 | if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT]) | |
359 | shift++; | |
360 | } | |
361 | if (shift) | |
362 | alloc_blocks >>= shift; | |
363 | } | |
364 | ||
365 | if (alloc_blocks < mp->m_writeio_blocks) | |
366 | alloc_blocks = mp->m_writeio_blocks; | |
367 | ||
368 | return alloc_blocks; | |
369 | } | |
370 | ||
a206c817 | 371 | int |
1da177e4 LT |
372 | xfs_iomap_write_delay( |
373 | xfs_inode_t *ip, | |
f403b7f4 | 374 | xfs_off_t offset, |
1da177e4 | 375 | size_t count, |
405f8042 | 376 | xfs_bmbt_irec_t *ret_imap) |
1da177e4 LT |
377 | { |
378 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
379 | xfs_fileoff_t offset_fsb; |
380 | xfs_fileoff_t last_fsb; | |
dd9f438e NS |
381 | xfs_off_t aligned_offset; |
382 | xfs_fileoff_t ioalign; | |
dd9f438e | 383 | xfs_extlen_t extsz; |
1da177e4 | 384 | int nimaps; |
1da177e4 | 385 | xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; |
8de2bf93 | 386 | int prealloc, flushed = 0; |
dd9f438e | 387 | int error; |
1da177e4 | 388 | |
579aa9ca | 389 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 LT |
390 | |
391 | /* | |
392 | * Make sure that the dquots are there. This doesn't hold | |
393 | * the ilock across a disk read. | |
394 | */ | |
7d095257 | 395 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 LT |
396 | if (error) |
397 | return XFS_ERROR(error); | |
398 | ||
957d0ebe | 399 | extsz = xfs_get_extsz_hint(ip); |
dd9f438e NS |
400 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
401 | ||
055388a3 | 402 | |
9f6c92b9 | 403 | error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, |
405f8042 | 404 | imap, XFS_WRITE_IMAPS, &prealloc); |
dd9f438e NS |
405 | if (error) |
406 | return error; | |
1da177e4 | 407 | |
8de2bf93 | 408 | retry: |
dd9f438e | 409 | if (prealloc) { |
055388a3 DC |
410 | xfs_fsblock_t alloc_blocks = xfs_iomap_prealloc_size(mp, ip); |
411 | ||
1da177e4 LT |
412 | aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); |
413 | ioalign = XFS_B_TO_FSBT(mp, aligned_offset); | |
055388a3 | 414 | last_fsb = ioalign + alloc_blocks; |
dd9f438e NS |
415 | } else { |
416 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
1da177e4 | 417 | } |
1da177e4 | 418 | |
dd9f438e | 419 | if (prealloc || extsz) { |
9f6c92b9 | 420 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e | 421 | if (error) |
1da177e4 | 422 | return error; |
1da177e4 | 423 | } |
dd9f438e NS |
424 | |
425 | nimaps = XFS_WRITE_IMAPS; | |
4403280a CH |
426 | error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb, |
427 | imap, &nimaps, XFS_BMAPI_ENTIRE); | |
055388a3 DC |
428 | switch (error) { |
429 | case 0: | |
430 | case ENOSPC: | |
431 | case EDQUOT: | |
432 | break; | |
433 | default: | |
1da177e4 | 434 | return XFS_ERROR(error); |
055388a3 | 435 | } |
dd9f438e | 436 | |
1da177e4 | 437 | /* |
055388a3 DC |
438 | * If bmapi returned us nothing, we got either ENOSPC or EDQUOT. For |
439 | * ENOSPC, * flush all other inodes with delalloc blocks to free up | |
440 | * some of the excess reserved metadata space. For both cases, retry | |
441 | * without EOF preallocation. | |
1da177e4 LT |
442 | */ |
443 | if (nimaps == 0) { | |
0b1b213f | 444 | trace_xfs_delalloc_enospc(ip, offset, count); |
8de2bf93 | 445 | if (flushed) |
055388a3 | 446 | return XFS_ERROR(error ? error : ENOSPC); |
1da177e4 | 447 | |
055388a3 DC |
448 | if (error == ENOSPC) { |
449 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
450 | xfs_flush_inodes(ip); | |
451 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
452 | } | |
8de2bf93 DC |
453 | |
454 | flushed = 1; | |
1da177e4 | 455 | error = 0; |
8de2bf93 | 456 | prealloc = 0; |
1da177e4 LT |
457 | goto retry; |
458 | } | |
459 | ||
86c4d623 | 460 | if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 461 | return xfs_alert_fsblock_zero(ip, &imap[0]); |
dd9f438e NS |
462 | |
463 | *ret_imap = imap[0]; | |
1da177e4 LT |
464 | return 0; |
465 | } | |
466 | ||
467 | /* | |
468 | * Pass in a delayed allocate extent, convert it to real extents; | |
469 | * return to the caller the extent we create which maps on top of | |
470 | * the originating callers request. | |
471 | * | |
472 | * Called without a lock on the inode. | |
e4143a1c DC |
473 | * |
474 | * We no longer bother to look at the incoming map - all we have to | |
475 | * guarantee is that whatever we allocate fills the required range. | |
1da177e4 | 476 | */ |
a206c817 | 477 | int |
1da177e4 LT |
478 | xfs_iomap_write_allocate( |
479 | xfs_inode_t *ip, | |
f403b7f4 | 480 | xfs_off_t offset, |
24e17b5f | 481 | size_t count, |
405f8042 | 482 | xfs_bmbt_irec_t *imap) |
1da177e4 LT |
483 | { |
484 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
485 | xfs_fileoff_t offset_fsb, last_block; |
486 | xfs_fileoff_t end_fsb, map_start_fsb; | |
487 | xfs_fsblock_t first_block; | |
488 | xfs_bmap_free_t free_list; | |
489 | xfs_filblks_t count_fsb; | |
1da177e4 | 490 | xfs_trans_t *tp; |
e4143a1c | 491 | int nimaps, committed; |
1da177e4 LT |
492 | int error = 0; |
493 | int nres; | |
494 | ||
1da177e4 LT |
495 | /* |
496 | * Make sure that the dquots are there. | |
497 | */ | |
7d095257 CH |
498 | error = xfs_qm_dqattach(ip, 0); |
499 | if (error) | |
1da177e4 LT |
500 | return XFS_ERROR(error); |
501 | ||
24e17b5f | 502 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
3070451e CH |
503 | count_fsb = imap->br_blockcount; |
504 | map_start_fsb = imap->br_startoff; | |
1da177e4 LT |
505 | |
506 | XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); | |
507 | ||
508 | while (count_fsb != 0) { | |
509 | /* | |
510 | * Set up a transaction with which to allocate the | |
511 | * backing store for the file. Do allocations in a | |
512 | * loop until we get some space in the range we are | |
513 | * interested in. The other space that might be allocated | |
514 | * is in the delayed allocation extent on which we sit | |
515 | * but before our buffer starts. | |
516 | */ | |
517 | ||
518 | nimaps = 0; | |
519 | while (nimaps == 0) { | |
520 | tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); | |
84e1e99f | 521 | tp->t_flags |= XFS_TRANS_RESERVE; |
1da177e4 LT |
522 | nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); |
523 | error = xfs_trans_reserve(tp, nres, | |
524 | XFS_WRITE_LOG_RES(mp), | |
525 | 0, XFS_TRANS_PERM_LOG_RES, | |
526 | XFS_WRITE_LOG_COUNT); | |
1da177e4 LT |
527 | if (error) { |
528 | xfs_trans_cancel(tp, 0); | |
529 | return XFS_ERROR(error); | |
530 | } | |
531 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
ddc3415a | 532 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 533 | |
9d87c319 | 534 | xfs_bmap_init(&free_list, &first_block); |
1da177e4 | 535 | |
1da177e4 | 536 | /* |
e4143a1c DC |
537 | * it is possible that the extents have changed since |
538 | * we did the read call as we dropped the ilock for a | |
539 | * while. We have to be careful about truncates or hole | |
540 | * punchs here - we are not allowed to allocate | |
541 | * non-delalloc blocks here. | |
542 | * | |
543 | * The only protection against truncation is the pages | |
544 | * for the range we are being asked to convert are | |
545 | * locked and hence a truncate will block on them | |
546 | * first. | |
547 | * | |
548 | * As a result, if we go beyond the range we really | |
549 | * need and hit an delalloc extent boundary followed by | |
550 | * a hole while we have excess blocks in the map, we | |
551 | * will fill the hole incorrectly and overrun the | |
552 | * transaction reservation. | |
553 | * | |
554 | * Using a single map prevents this as we are forced to | |
555 | * check each map we look for overlap with the desired | |
556 | * range and abort as soon as we find it. Also, given | |
557 | * that we only return a single map, having one beyond | |
558 | * what we can return is probably a bit silly. | |
559 | * | |
560 | * We also need to check that we don't go beyond EOF; | |
561 | * this is a truncate optimisation as a truncate sets | |
562 | * the new file size before block on the pages we | |
563 | * currently have locked under writeback. Because they | |
564 | * are about to be tossed, we don't need to write them | |
565 | * back.... | |
1da177e4 | 566 | */ |
e4143a1c | 567 | nimaps = 1; |
ce7ae151 | 568 | end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)); |
7c9ef85c DC |
569 | error = xfs_bmap_last_offset(NULL, ip, &last_block, |
570 | XFS_DATA_FORK); | |
571 | if (error) | |
572 | goto trans_cancel; | |
573 | ||
1da177e4 LT |
574 | last_block = XFS_FILEOFF_MAX(last_block, end_fsb); |
575 | if ((map_start_fsb + count_fsb) > last_block) { | |
576 | count_fsb = last_block - map_start_fsb; | |
577 | if (count_fsb == 0) { | |
578 | error = EAGAIN; | |
579 | goto trans_cancel; | |
580 | } | |
581 | } | |
582 | ||
3070451e | 583 | /* |
3070451e CH |
584 | * From this point onwards we overwrite the imap |
585 | * pointer that the caller gave to us. | |
586 | */ | |
c0dc7828 DC |
587 | error = xfs_bmapi_write(tp, ip, map_start_fsb, |
588 | count_fsb, 0, &first_block, 1, | |
589 | imap, &nimaps, &free_list); | |
1da177e4 LT |
590 | if (error) |
591 | goto trans_cancel; | |
592 | ||
f7c99b6f | 593 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
1da177e4 LT |
594 | if (error) |
595 | goto trans_cancel; | |
596 | ||
1c72bf90 | 597 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
598 | if (error) |
599 | goto error0; | |
600 | ||
601 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
602 | } | |
603 | ||
604 | /* | |
605 | * See if we were able to allocate an extent that | |
606 | * covers at least part of the callers request | |
607 | */ | |
3070451e | 608 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 609 | return xfs_alert_fsblock_zero(ip, imap); |
86c4d623 | 610 | |
3070451e CH |
611 | if ((offset_fsb >= imap->br_startoff) && |
612 | (offset_fsb < (imap->br_startoff + | |
613 | imap->br_blockcount))) { | |
e4143a1c DC |
614 | XFS_STATS_INC(xs_xstrat_quick); |
615 | return 0; | |
1da177e4 LT |
616 | } |
617 | ||
e4143a1c DC |
618 | /* |
619 | * So far we have not mapped the requested part of the | |
1da177e4 LT |
620 | * file, just surrounding data, try again. |
621 | */ | |
3070451e CH |
622 | count_fsb -= imap->br_blockcount; |
623 | map_start_fsb = imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
624 | } |
625 | ||
626 | trans_cancel: | |
627 | xfs_bmap_cancel(&free_list); | |
628 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
629 | error0: | |
630 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
631 | return XFS_ERROR(error); | |
632 | } | |
633 | ||
634 | int | |
635 | xfs_iomap_write_unwritten( | |
636 | xfs_inode_t *ip, | |
f403b7f4 | 637 | xfs_off_t offset, |
1da177e4 LT |
638 | size_t count) |
639 | { | |
640 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
641 | xfs_fileoff_t offset_fsb; |
642 | xfs_filblks_t count_fsb; | |
643 | xfs_filblks_t numblks_fsb; | |
dd9f438e NS |
644 | xfs_fsblock_t firstfsb; |
645 | int nimaps; | |
646 | xfs_trans_t *tp; | |
647 | xfs_bmbt_irec_t imap; | |
648 | xfs_bmap_free_t free_list; | |
84803fb7 | 649 | xfs_fsize_t i_size; |
dd9f438e | 650 | uint resblks; |
1da177e4 LT |
651 | int committed; |
652 | int error; | |
1da177e4 | 653 | |
0b1b213f | 654 | trace_xfs_unwritten_convert(ip, offset, count); |
1da177e4 LT |
655 | |
656 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
657 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
658 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); | |
659 | ||
4ddd8bb1 LM |
660 | /* |
661 | * Reserve enough blocks in this transaction for two complete extent | |
662 | * btree splits. We may be converting the middle part of an unwritten | |
663 | * extent and in this case we will insert two new extents in the btree | |
664 | * each of which could cause a full split. | |
665 | * | |
666 | * This reservation amount will be used in the first call to | |
667 | * xfs_bmbt_split() to select an AG with enough space to satisfy the | |
668 | * rest of the operation. | |
669 | */ | |
dd9f438e | 670 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
1da177e4 | 671 | |
dd9f438e | 672 | do { |
1da177e4 LT |
673 | /* |
674 | * set up a transaction to convert the range of extents | |
675 | * from unwritten to real. Do allocations in a loop until | |
676 | * we have covered the range passed in. | |
80641dc6 CH |
677 | * |
678 | * Note that we open code the transaction allocation here | |
679 | * to pass KM_NOFS--we can't risk to recursing back into | |
680 | * the filesystem here as we might be asked to write out | |
681 | * the same inode that we complete here and might deadlock | |
682 | * on the iolock. | |
1da177e4 | 683 | */ |
80641dc6 CH |
684 | xfs_wait_for_freeze(mp, SB_FREEZE_TRANS); |
685 | tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS); | |
84e1e99f | 686 | tp->t_flags |= XFS_TRANS_RESERVE; |
dd9f438e | 687 | error = xfs_trans_reserve(tp, resblks, |
1da177e4 LT |
688 | XFS_WRITE_LOG_RES(mp), 0, |
689 | XFS_TRANS_PERM_LOG_RES, | |
690 | XFS_WRITE_LOG_COUNT); | |
691 | if (error) { | |
692 | xfs_trans_cancel(tp, 0); | |
572d95f4 | 693 | return XFS_ERROR(error); |
1da177e4 LT |
694 | } |
695 | ||
696 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
ddc3415a | 697 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 LT |
698 | |
699 | /* | |
700 | * Modify the unwritten extent state of the buffer. | |
701 | */ | |
9d87c319 | 702 | xfs_bmap_init(&free_list, &firstfsb); |
1da177e4 | 703 | nimaps = 1; |
c0dc7828 DC |
704 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
705 | XFS_BMAPI_CONVERT, &firstfsb, | |
b4e9181e | 706 | 1, &imap, &nimaps, &free_list); |
1da177e4 LT |
707 | if (error) |
708 | goto error_on_bmapi_transaction; | |
709 | ||
84803fb7 CH |
710 | /* |
711 | * Log the updated inode size as we go. We have to be careful | |
712 | * to only log it up to the actual write offset if it is | |
713 | * halfway into a block. | |
714 | */ | |
715 | i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb); | |
716 | if (i_size > offset + count) | |
717 | i_size = offset + count; | |
718 | ||
719 | i_size = xfs_new_eof(ip, i_size); | |
720 | if (i_size) { | |
721 | ip->i_d.di_size = i_size; | |
722 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
723 | } | |
724 | ||
725 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
1da177e4 LT |
726 | if (error) |
727 | goto error_on_bmapi_transaction; | |
728 | ||
1c72bf90 | 729 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
730 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
731 | if (error) | |
572d95f4 NS |
732 | return XFS_ERROR(error); |
733 | ||
86c4d623 | 734 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 735 | return xfs_alert_fsblock_zero(ip, &imap); |
1da177e4 LT |
736 | |
737 | if ((numblks_fsb = imap.br_blockcount) == 0) { | |
738 | /* | |
739 | * The numblks_fsb value should always get | |
740 | * smaller, otherwise the loop is stuck. | |
741 | */ | |
742 | ASSERT(imap.br_blockcount); | |
743 | break; | |
744 | } | |
745 | offset_fsb += numblks_fsb; | |
746 | count_fsb -= numblks_fsb; | |
747 | } while (count_fsb > 0); | |
748 | ||
749 | return 0; | |
750 | ||
751 | error_on_bmapi_transaction: | |
752 | xfs_bmap_cancel(&free_list); | |
753 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); | |
754 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1da177e4 LT |
755 | return XFS_ERROR(error); |
756 | } |