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" | |
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 NS |
103 | STATIC int |
104 | xfs_cmn_err_fsblock_zero( | |
105 | xfs_inode_t *ip, | |
106 | xfs_bmbt_irec_t *imap) | |
107 | { | |
108 | xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount, | |
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 | |
dd9f438e | 213 | bmapi_flag = XFS_BMAPI_WRITE; |
405f8042 | 214 | if (offset < ip->i_size || extsz) |
1da177e4 LT |
215 | bmapi_flag |= XFS_BMAPI_PREALLOC; |
216 | ||
217 | /* | |
3070451e CH |
218 | * Issue the xfs_bmapi() call to allocate the blocks. |
219 | * | |
220 | * From this point onwards we overwrite the imap pointer that the | |
221 | * caller gave to us. | |
1da177e4 | 222 | */ |
9d87c319 | 223 | xfs_bmap_init(&free_list, &firstfsb); |
06d10dd9 | 224 | nimaps = 1; |
541d7d3c | 225 | error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, bmapi_flag, |
3070451e | 226 | &firstfsb, 0, imap, &nimaps, &free_list); |
06d10dd9 | 227 | if (error) |
1da177e4 | 228 | goto error0; |
1da177e4 LT |
229 | |
230 | /* | |
06d10dd9 | 231 | * Complete the transaction |
1da177e4 | 232 | */ |
f7c99b6f | 233 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
06d10dd9 | 234 | if (error) |
1da177e4 | 235 | goto error0; |
1c72bf90 | 236 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
06d10dd9 | 237 | if (error) |
1da177e4 | 238 | goto error_out; |
1da177e4 | 239 | |
06d10dd9 NS |
240 | /* |
241 | * Copy any maps to caller's array and return any error. | |
242 | */ | |
1da177e4 | 243 | if (nimaps == 0) { |
572d95f4 NS |
244 | error = ENOSPC; |
245 | goto error_out; | |
246 | } | |
247 | ||
3070451e CH |
248 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) { |
249 | error = xfs_cmn_err_fsblock_zero(ip, imap); | |
1da177e4 LT |
250 | goto error_out; |
251 | } | |
252 | ||
1da177e4 LT |
253 | return 0; |
254 | ||
06d10dd9 | 255 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ |
1da177e4 | 256 | xfs_bmap_cancel(&free_list); |
7d095257 | 257 | xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
1da177e4 | 258 | |
06d10dd9 | 259 | error1: /* Just cancel transaction */ |
1da177e4 | 260 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); |
1da177e4 LT |
261 | |
262 | error_out: | |
263 | return XFS_ERROR(error); | |
264 | } | |
265 | ||
dd9f438e | 266 | /* |
8de2bf93 DC |
267 | * If the caller is doing a write at the end of the file, then extend the |
268 | * allocation out to the file system's write iosize. We clean up any extra | |
269 | * space left over when the file is closed in xfs_inactive(). | |
055388a3 DC |
270 | * |
271 | * If we find we already have delalloc preallocation beyond EOF, don't do more | |
272 | * preallocation as it it not needed. | |
dd9f438e NS |
273 | */ |
274 | STATIC int | |
275 | xfs_iomap_eof_want_preallocate( | |
276 | xfs_mount_t *mp, | |
541d7d3c | 277 | xfs_inode_t *ip, |
dd9f438e NS |
278 | xfs_off_t offset, |
279 | size_t count, | |
dd9f438e NS |
280 | xfs_bmbt_irec_t *imap, |
281 | int nimaps, | |
282 | int *prealloc) | |
283 | { | |
284 | xfs_fileoff_t start_fsb; | |
285 | xfs_filblks_t count_fsb; | |
286 | xfs_fsblock_t firstblock; | |
287 | int n, error, imaps; | |
055388a3 | 288 | int found_delalloc = 0; |
dd9f438e NS |
289 | |
290 | *prealloc = 0; | |
8de2bf93 | 291 | if ((offset + count) <= ip->i_size) |
dd9f438e NS |
292 | return 0; |
293 | ||
294 | /* | |
295 | * If there are any real blocks past eof, then don't | |
296 | * do any speculative allocation. | |
297 | */ | |
298 | start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); | |
299 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); | |
300 | while (count_fsb > 0) { | |
301 | imaps = nimaps; | |
3ddb8fa9 | 302 | firstblock = NULLFSBLOCK; |
541d7d3c | 303 | error = xfs_bmapi(NULL, ip, start_fsb, count_fsb, 0, |
b4e9181e | 304 | &firstblock, 0, imap, &imaps, NULL); |
dd9f438e NS |
305 | if (error) |
306 | return error; | |
307 | for (n = 0; n < imaps; n++) { | |
308 | if ((imap[n].br_startblock != HOLESTARTBLOCK) && | |
309 | (imap[n].br_startblock != DELAYSTARTBLOCK)) | |
310 | return 0; | |
311 | start_fsb += imap[n].br_blockcount; | |
312 | count_fsb -= imap[n].br_blockcount; | |
055388a3 DC |
313 | |
314 | if (imap[n].br_startblock == DELAYSTARTBLOCK) | |
315 | found_delalloc = 1; | |
dd9f438e NS |
316 | } |
317 | } | |
055388a3 DC |
318 | if (!found_delalloc) |
319 | *prealloc = 1; | |
dd9f438e NS |
320 | return 0; |
321 | } | |
322 | ||
055388a3 DC |
323 | /* |
324 | * If we don't have a user specified preallocation size, dynamically increase | |
325 | * the preallocation size as the size of the file grows. Cap the maximum size | |
326 | * at a single extent or less if the filesystem is near full. The closer the | |
327 | * filesystem is to full, the smaller the maximum prealocation. | |
328 | */ | |
329 | STATIC xfs_fsblock_t | |
330 | xfs_iomap_prealloc_size( | |
331 | struct xfs_mount *mp, | |
332 | struct xfs_inode *ip) | |
333 | { | |
334 | xfs_fsblock_t alloc_blocks = 0; | |
335 | ||
336 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { | |
337 | int shift = 0; | |
338 | int64_t freesp; | |
339 | ||
340 | alloc_blocks = XFS_B_TO_FSB(mp, ip->i_size); | |
341 | alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN, | |
342 | rounddown_pow_of_two(alloc_blocks)); | |
343 | ||
344 | xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); | |
345 | freesp = mp->m_sb.sb_fdblocks; | |
346 | if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) { | |
347 | shift = 2; | |
348 | if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT]) | |
349 | shift++; | |
350 | if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT]) | |
351 | shift++; | |
352 | if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT]) | |
353 | shift++; | |
354 | if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT]) | |
355 | shift++; | |
356 | } | |
357 | if (shift) | |
358 | alloc_blocks >>= shift; | |
359 | } | |
360 | ||
361 | if (alloc_blocks < mp->m_writeio_blocks) | |
362 | alloc_blocks = mp->m_writeio_blocks; | |
363 | ||
364 | return alloc_blocks; | |
365 | } | |
366 | ||
a206c817 | 367 | int |
1da177e4 LT |
368 | xfs_iomap_write_delay( |
369 | xfs_inode_t *ip, | |
f403b7f4 | 370 | xfs_off_t offset, |
1da177e4 | 371 | size_t count, |
405f8042 | 372 | xfs_bmbt_irec_t *ret_imap) |
1da177e4 LT |
373 | { |
374 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
375 | xfs_fileoff_t offset_fsb; |
376 | xfs_fileoff_t last_fsb; | |
dd9f438e NS |
377 | xfs_off_t aligned_offset; |
378 | xfs_fileoff_t ioalign; | |
1da177e4 | 379 | xfs_fsblock_t firstblock; |
dd9f438e | 380 | xfs_extlen_t extsz; |
1da177e4 | 381 | int nimaps; |
1da177e4 | 382 | xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; |
8de2bf93 | 383 | int prealloc, flushed = 0; |
dd9f438e | 384 | int error; |
1da177e4 | 385 | |
579aa9ca | 386 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 LT |
387 | |
388 | /* | |
389 | * Make sure that the dquots are there. This doesn't hold | |
390 | * the ilock across a disk read. | |
391 | */ | |
7d095257 | 392 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 LT |
393 | if (error) |
394 | return XFS_ERROR(error); | |
395 | ||
957d0ebe | 396 | extsz = xfs_get_extsz_hint(ip); |
dd9f438e NS |
397 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
398 | ||
055388a3 | 399 | |
9f6c92b9 | 400 | error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, |
405f8042 | 401 | imap, XFS_WRITE_IMAPS, &prealloc); |
dd9f438e NS |
402 | if (error) |
403 | return error; | |
1da177e4 | 404 | |
8de2bf93 | 405 | retry: |
dd9f438e | 406 | if (prealloc) { |
055388a3 DC |
407 | xfs_fsblock_t alloc_blocks = xfs_iomap_prealloc_size(mp, ip); |
408 | ||
1da177e4 LT |
409 | aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); |
410 | ioalign = XFS_B_TO_FSBT(mp, aligned_offset); | |
055388a3 | 411 | last_fsb = ioalign + alloc_blocks; |
dd9f438e NS |
412 | } else { |
413 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
1da177e4 | 414 | } |
1da177e4 | 415 | |
dd9f438e | 416 | if (prealloc || extsz) { |
9f6c92b9 | 417 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e | 418 | if (error) |
1da177e4 | 419 | return error; |
1da177e4 | 420 | } |
dd9f438e NS |
421 | |
422 | nimaps = XFS_WRITE_IMAPS; | |
423 | firstblock = NULLFSBLOCK; | |
541d7d3c | 424 | error = xfs_bmapi(NULL, ip, offset_fsb, |
1da177e4 LT |
425 | (xfs_filblks_t)(last_fsb - offset_fsb), |
426 | XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | | |
427 | XFS_BMAPI_ENTIRE, &firstblock, 1, imap, | |
b4e9181e | 428 | &nimaps, NULL); |
055388a3 DC |
429 | switch (error) { |
430 | case 0: | |
431 | case ENOSPC: | |
432 | case EDQUOT: | |
433 | break; | |
434 | default: | |
1da177e4 | 435 | return XFS_ERROR(error); |
055388a3 | 436 | } |
dd9f438e | 437 | |
1da177e4 | 438 | /* |
055388a3 DC |
439 | * If bmapi returned us nothing, we got either ENOSPC or EDQUOT. For |
440 | * ENOSPC, * flush all other inodes with delalloc blocks to free up | |
441 | * some of the excess reserved metadata space. For both cases, retry | |
442 | * without EOF preallocation. | |
1da177e4 LT |
443 | */ |
444 | if (nimaps == 0) { | |
0b1b213f | 445 | trace_xfs_delalloc_enospc(ip, offset, count); |
8de2bf93 | 446 | if (flushed) |
055388a3 | 447 | return XFS_ERROR(error ? error : ENOSPC); |
1da177e4 | 448 | |
055388a3 DC |
449 | if (error == ENOSPC) { |
450 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
451 | xfs_flush_inodes(ip); | |
452 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
453 | } | |
8de2bf93 DC |
454 | |
455 | flushed = 1; | |
1da177e4 | 456 | error = 0; |
8de2bf93 | 457 | prealloc = 0; |
1da177e4 LT |
458 | goto retry; |
459 | } | |
460 | ||
86c4d623 | 461 | if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) |
572d95f4 | 462 | return xfs_cmn_err_fsblock_zero(ip, &imap[0]); |
dd9f438e NS |
463 | |
464 | *ret_imap = imap[0]; | |
1da177e4 LT |
465 | return 0; |
466 | } | |
467 | ||
468 | /* | |
469 | * Pass in a delayed allocate extent, convert it to real extents; | |
470 | * return to the caller the extent we create which maps on top of | |
471 | * the originating callers request. | |
472 | * | |
473 | * Called without a lock on the inode. | |
e4143a1c DC |
474 | * |
475 | * We no longer bother to look at the incoming map - all we have to | |
476 | * guarantee is that whatever we allocate fills the required range. | |
1da177e4 | 477 | */ |
a206c817 | 478 | int |
1da177e4 LT |
479 | xfs_iomap_write_allocate( |
480 | xfs_inode_t *ip, | |
f403b7f4 | 481 | xfs_off_t offset, |
24e17b5f | 482 | size_t count, |
405f8042 | 483 | xfs_bmbt_irec_t *imap) |
1da177e4 LT |
484 | { |
485 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
486 | xfs_fileoff_t offset_fsb, last_block; |
487 | xfs_fileoff_t end_fsb, map_start_fsb; | |
488 | xfs_fsblock_t first_block; | |
489 | xfs_bmap_free_t free_list; | |
490 | xfs_filblks_t count_fsb; | |
1da177e4 | 491 | xfs_trans_t *tp; |
e4143a1c | 492 | int nimaps, committed; |
1da177e4 LT |
493 | int error = 0; |
494 | int nres; | |
495 | ||
1da177e4 LT |
496 | /* |
497 | * Make sure that the dquots are there. | |
498 | */ | |
7d095257 CH |
499 | error = xfs_qm_dqattach(ip, 0); |
500 | if (error) | |
1da177e4 LT |
501 | return XFS_ERROR(error); |
502 | ||
24e17b5f | 503 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
3070451e CH |
504 | count_fsb = imap->br_blockcount; |
505 | map_start_fsb = imap->br_startoff; | |
1da177e4 LT |
506 | |
507 | XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); | |
508 | ||
509 | while (count_fsb != 0) { | |
510 | /* | |
511 | * Set up a transaction with which to allocate the | |
512 | * backing store for the file. Do allocations in a | |
513 | * loop until we get some space in the range we are | |
514 | * interested in. The other space that might be allocated | |
515 | * is in the delayed allocation extent on which we sit | |
516 | * but before our buffer starts. | |
517 | */ | |
518 | ||
519 | nimaps = 0; | |
520 | while (nimaps == 0) { | |
521 | tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); | |
84e1e99f | 522 | tp->t_flags |= XFS_TRANS_RESERVE; |
1da177e4 LT |
523 | nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); |
524 | error = xfs_trans_reserve(tp, nres, | |
525 | XFS_WRITE_LOG_RES(mp), | |
526 | 0, XFS_TRANS_PERM_LOG_RES, | |
527 | XFS_WRITE_LOG_COUNT); | |
1da177e4 LT |
528 | if (error) { |
529 | xfs_trans_cancel(tp, 0); | |
530 | return XFS_ERROR(error); | |
531 | } | |
532 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
898621d5 | 533 | xfs_trans_ijoin(tp, ip); |
1da177e4 | 534 | |
9d87c319 | 535 | xfs_bmap_init(&free_list, &first_block); |
1da177e4 | 536 | |
1da177e4 | 537 | /* |
e4143a1c DC |
538 | * it is possible that the extents have changed since |
539 | * we did the read call as we dropped the ilock for a | |
540 | * while. We have to be careful about truncates or hole | |
541 | * punchs here - we are not allowed to allocate | |
542 | * non-delalloc blocks here. | |
543 | * | |
544 | * The only protection against truncation is the pages | |
545 | * for the range we are being asked to convert are | |
546 | * locked and hence a truncate will block on them | |
547 | * first. | |
548 | * | |
549 | * As a result, if we go beyond the range we really | |
550 | * need and hit an delalloc extent boundary followed by | |
551 | * a hole while we have excess blocks in the map, we | |
552 | * will fill the hole incorrectly and overrun the | |
553 | * transaction reservation. | |
554 | * | |
555 | * Using a single map prevents this as we are forced to | |
556 | * check each map we look for overlap with the desired | |
557 | * range and abort as soon as we find it. Also, given | |
558 | * that we only return a single map, having one beyond | |
559 | * what we can return is probably a bit silly. | |
560 | * | |
561 | * We also need to check that we don't go beyond EOF; | |
562 | * this is a truncate optimisation as a truncate sets | |
563 | * the new file size before block on the pages we | |
564 | * currently have locked under writeback. Because they | |
565 | * are about to be tossed, we don't need to write them | |
566 | * back.... | |
1da177e4 | 567 | */ |
e4143a1c | 568 | nimaps = 1; |
ba87ea69 | 569 | end_fsb = XFS_B_TO_FSB(mp, ip->i_size); |
7c9ef85c DC |
570 | error = xfs_bmap_last_offset(NULL, ip, &last_block, |
571 | XFS_DATA_FORK); | |
572 | if (error) | |
573 | goto trans_cancel; | |
574 | ||
1da177e4 LT |
575 | last_block = XFS_FILEOFF_MAX(last_block, end_fsb); |
576 | if ((map_start_fsb + count_fsb) > last_block) { | |
577 | count_fsb = last_block - map_start_fsb; | |
578 | if (count_fsb == 0) { | |
579 | error = EAGAIN; | |
580 | goto trans_cancel; | |
581 | } | |
582 | } | |
583 | ||
3070451e CH |
584 | /* |
585 | * Go get the actual blocks. | |
586 | * | |
587 | * From this point onwards we overwrite the imap | |
588 | * pointer that the caller gave to us. | |
589 | */ | |
541d7d3c | 590 | error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb, |
1da177e4 | 591 | XFS_BMAPI_WRITE, &first_block, 1, |
3070451e | 592 | imap, &nimaps, &free_list); |
1da177e4 LT |
593 | if (error) |
594 | goto trans_cancel; | |
595 | ||
f7c99b6f | 596 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
1da177e4 LT |
597 | if (error) |
598 | goto trans_cancel; | |
599 | ||
1c72bf90 | 600 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
601 | if (error) |
602 | goto error0; | |
603 | ||
604 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
605 | } | |
606 | ||
607 | /* | |
608 | * See if we were able to allocate an extent that | |
609 | * covers at least part of the callers request | |
610 | */ | |
3070451e CH |
611 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
612 | return xfs_cmn_err_fsblock_zero(ip, imap); | |
86c4d623 | 613 | |
3070451e CH |
614 | if ((offset_fsb >= imap->br_startoff) && |
615 | (offset_fsb < (imap->br_startoff + | |
616 | imap->br_blockcount))) { | |
e4143a1c DC |
617 | XFS_STATS_INC(xs_xstrat_quick); |
618 | return 0; | |
1da177e4 LT |
619 | } |
620 | ||
e4143a1c DC |
621 | /* |
622 | * So far we have not mapped the requested part of the | |
1da177e4 LT |
623 | * file, just surrounding data, try again. |
624 | */ | |
3070451e CH |
625 | count_fsb -= imap->br_blockcount; |
626 | map_start_fsb = imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
627 | } |
628 | ||
629 | trans_cancel: | |
630 | xfs_bmap_cancel(&free_list); | |
631 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
632 | error0: | |
633 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
634 | return XFS_ERROR(error); | |
635 | } | |
636 | ||
637 | int | |
638 | xfs_iomap_write_unwritten( | |
639 | xfs_inode_t *ip, | |
f403b7f4 | 640 | xfs_off_t offset, |
1da177e4 LT |
641 | size_t count) |
642 | { | |
643 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
644 | xfs_fileoff_t offset_fsb; |
645 | xfs_filblks_t count_fsb; | |
646 | xfs_filblks_t numblks_fsb; | |
dd9f438e NS |
647 | xfs_fsblock_t firstfsb; |
648 | int nimaps; | |
649 | xfs_trans_t *tp; | |
650 | xfs_bmbt_irec_t imap; | |
651 | xfs_bmap_free_t free_list; | |
652 | uint resblks; | |
1da177e4 LT |
653 | int committed; |
654 | int error; | |
1da177e4 | 655 | |
0b1b213f | 656 | trace_xfs_unwritten_convert(ip, offset, count); |
1da177e4 LT |
657 | |
658 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
659 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
660 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); | |
661 | ||
4ddd8bb1 LM |
662 | /* |
663 | * Reserve enough blocks in this transaction for two complete extent | |
664 | * btree splits. We may be converting the middle part of an unwritten | |
665 | * extent and in this case we will insert two new extents in the btree | |
666 | * each of which could cause a full split. | |
667 | * | |
668 | * This reservation amount will be used in the first call to | |
669 | * xfs_bmbt_split() to select an AG with enough space to satisfy the | |
670 | * rest of the operation. | |
671 | */ | |
dd9f438e | 672 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
1da177e4 | 673 | |
dd9f438e | 674 | do { |
1da177e4 LT |
675 | /* |
676 | * set up a transaction to convert the range of extents | |
677 | * from unwritten to real. Do allocations in a loop until | |
678 | * we have covered the range passed in. | |
80641dc6 CH |
679 | * |
680 | * Note that we open code the transaction allocation here | |
681 | * to pass KM_NOFS--we can't risk to recursing back into | |
682 | * the filesystem here as we might be asked to write out | |
683 | * the same inode that we complete here and might deadlock | |
684 | * on the iolock. | |
1da177e4 | 685 | */ |
80641dc6 CH |
686 | xfs_wait_for_freeze(mp, SB_FREEZE_TRANS); |
687 | tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS); | |
84e1e99f | 688 | tp->t_flags |= XFS_TRANS_RESERVE; |
dd9f438e | 689 | error = xfs_trans_reserve(tp, resblks, |
1da177e4 LT |
690 | XFS_WRITE_LOG_RES(mp), 0, |
691 | XFS_TRANS_PERM_LOG_RES, | |
692 | XFS_WRITE_LOG_COUNT); | |
693 | if (error) { | |
694 | xfs_trans_cancel(tp, 0); | |
572d95f4 | 695 | return XFS_ERROR(error); |
1da177e4 LT |
696 | } |
697 | ||
698 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
898621d5 | 699 | xfs_trans_ijoin(tp, ip); |
1da177e4 LT |
700 | |
701 | /* | |
702 | * Modify the unwritten extent state of the buffer. | |
703 | */ | |
9d87c319 | 704 | xfs_bmap_init(&free_list, &firstfsb); |
1da177e4 | 705 | nimaps = 1; |
541d7d3c | 706 | error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, |
dd9f438e | 707 | XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb, |
b4e9181e | 708 | 1, &imap, &nimaps, &free_list); |
1da177e4 LT |
709 | if (error) |
710 | goto error_on_bmapi_transaction; | |
711 | ||
f7c99b6f | 712 | error = xfs_bmap_finish(&(tp), &(free_list), &committed); |
1da177e4 LT |
713 | if (error) |
714 | goto error_on_bmapi_transaction; | |
715 | ||
1c72bf90 | 716 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
717 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
718 | if (error) | |
572d95f4 NS |
719 | return XFS_ERROR(error); |
720 | ||
86c4d623 | 721 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
572d95f4 | 722 | return xfs_cmn_err_fsblock_zero(ip, &imap); |
1da177e4 LT |
723 | |
724 | if ((numblks_fsb = imap.br_blockcount) == 0) { | |
725 | /* | |
726 | * The numblks_fsb value should always get | |
727 | * smaller, otherwise the loop is stuck. | |
728 | */ | |
729 | ASSERT(imap.br_blockcount); | |
730 | break; | |
731 | } | |
732 | offset_fsb += numblks_fsb; | |
733 | count_fsb -= numblks_fsb; | |
734 | } while (count_fsb > 0); | |
735 | ||
736 | return 0; | |
737 | ||
738 | error_on_bmapi_transaction: | |
739 | xfs_bmap_cancel(&free_list); | |
740 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); | |
741 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1da177e4 LT |
742 | return XFS_ERROR(error); |
743 | } |