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) | |
50 | #define XFS_STRAT_WRITE_IMAPS 2 | |
51 | #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP | |
52 | ||
b4ed4626 CH |
53 | STATIC int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t, |
54 | int, struct xfs_bmbt_irec *, int *); | |
55 | STATIC int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int, | |
56 | struct xfs_bmbt_irec *, int *); | |
57 | STATIC int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t, | |
58 | struct xfs_bmbt_irec *, int *); | |
59 | ||
1da177e4 LT |
60 | int |
61 | xfs_iomap( | |
207d0416 CH |
62 | struct xfs_inode *ip, |
63 | xfs_off_t offset, | |
64 | ssize_t count, | |
65 | int flags, | |
66 | struct xfs_bmbt_irec *imap, | |
67 | int *nimaps, | |
68 | int *new) | |
1da177e4 | 69 | { |
207d0416 CH |
70 | struct xfs_mount *mp = ip->i_mount; |
71 | xfs_fileoff_t offset_fsb, end_fsb; | |
72 | int error = 0; | |
73 | int lockmode = 0; | |
74 | int bmapi_flags = 0; | |
1da177e4 | 75 | |
541d7d3c | 76 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG); |
207d0416 CH |
77 | |
78 | *new = 0; | |
541d7d3c | 79 | |
1da177e4 LT |
80 | if (XFS_FORCED_SHUTDOWN(mp)) |
81 | return XFS_ERROR(EIO); | |
82 | ||
0b1b213f CH |
83 | trace_xfs_iomap_enter(ip, offset, count, flags, NULL); |
84 | ||
7642861b | 85 | switch (flags & (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE)) { |
1da177e4 | 86 | case BMAPI_READ: |
541d7d3c | 87 | lockmode = xfs_ilock_map_shared(ip); |
1da177e4 | 88 | bmapi_flags = XFS_BMAPI_ENTIRE; |
1da177e4 LT |
89 | break; |
90 | case BMAPI_WRITE: | |
579aa9ca | 91 | lockmode = XFS_ILOCK_EXCL; |
c31e8878 NS |
92 | if (flags & BMAPI_IGNSTATE) |
93 | bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE; | |
541d7d3c | 94 | xfs_ilock(ip, lockmode); |
1da177e4 LT |
95 | break; |
96 | case BMAPI_ALLOCATE: | |
579aa9ca | 97 | lockmode = XFS_ILOCK_SHARED; |
1da177e4 | 98 | bmapi_flags = XFS_BMAPI_ENTIRE; |
541d7d3c | 99 | |
1da177e4 LT |
100 | /* Attempt non-blocking lock */ |
101 | if (flags & BMAPI_TRYLOCK) { | |
541d7d3c | 102 | if (!xfs_ilock_nowait(ip, lockmode)) |
1da177e4 LT |
103 | return XFS_ERROR(EAGAIN); |
104 | } else { | |
541d7d3c | 105 | xfs_ilock(ip, lockmode); |
1da177e4 LT |
106 | } |
107 | break; | |
1da177e4 LT |
108 | default: |
109 | BUG(); | |
110 | } | |
111 | ||
112 | ASSERT(offset <= mp->m_maxioffset); | |
113 | if ((xfs_fsize_t)offset + count > mp->m_maxioffset) | |
114 | count = mp->m_maxioffset - offset; | |
115 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
116 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
117 | ||
541d7d3c | 118 | error = xfs_bmapi(NULL, ip, offset_fsb, |
1da177e4 | 119 | (xfs_filblks_t)(end_fsb - offset_fsb), |
207d0416 | 120 | bmapi_flags, NULL, 0, imap, |
b4e9181e | 121 | nimaps, NULL); |
1da177e4 LT |
122 | |
123 | if (error) | |
124 | goto out; | |
125 | ||
7642861b | 126 | switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) { |
1da177e4 LT |
127 | case BMAPI_WRITE: |
128 | /* If we found an extent, return it */ | |
207d0416 CH |
129 | if (*nimaps && |
130 | (imap->br_startblock != HOLESTARTBLOCK) && | |
131 | (imap->br_startblock != DELAYSTARTBLOCK)) { | |
132 | trace_xfs_iomap_found(ip, offset, count, flags, imap); | |
1da177e4 LT |
133 | break; |
134 | } | |
135 | ||
f2bde9b8 | 136 | if (flags & BMAPI_DIRECT) { |
541d7d3c | 137 | error = xfs_iomap_write_direct(ip, offset, count, flags, |
b4ed4626 | 138 | imap, nimaps); |
1da177e4 | 139 | } else { |
541d7d3c | 140 | error = xfs_iomap_write_delay(ip, offset, count, flags, |
207d0416 | 141 | imap, nimaps); |
1da177e4 LT |
142 | } |
143 | if (!error) { | |
207d0416 | 144 | trace_xfs_iomap_alloc(ip, offset, count, flags, imap); |
1da177e4 | 145 | } |
207d0416 | 146 | *new = 1; |
1da177e4 LT |
147 | break; |
148 | case BMAPI_ALLOCATE: | |
149 | /* If we found an extent, return it */ | |
541d7d3c | 150 | xfs_iunlock(ip, lockmode); |
1da177e4 LT |
151 | lockmode = 0; |
152 | ||
207d0416 CH |
153 | if (*nimaps && !isnullstartblock(imap->br_startblock)) { |
154 | trace_xfs_iomap_found(ip, offset, count, flags, imap); | |
1da177e4 LT |
155 | break; |
156 | } | |
157 | ||
541d7d3c | 158 | error = xfs_iomap_write_allocate(ip, offset, count, |
207d0416 | 159 | imap, nimaps); |
1da177e4 | 160 | break; |
1da177e4 LT |
161 | } |
162 | ||
207d0416 | 163 | ASSERT(*nimaps <= 1); |
1da177e4 LT |
164 | |
165 | out: | |
166 | if (lockmode) | |
541d7d3c | 167 | xfs_iunlock(ip, lockmode); |
1da177e4 LT |
168 | return XFS_ERROR(error); |
169 | } | |
170 | ||
dd9f438e NS |
171 | STATIC int |
172 | xfs_iomap_eof_align_last_fsb( | |
173 | xfs_mount_t *mp, | |
541d7d3c | 174 | xfs_inode_t *ip, |
dd9f438e NS |
175 | xfs_extlen_t extsize, |
176 | xfs_fileoff_t *last_fsb) | |
177 | { | |
178 | xfs_fileoff_t new_last_fsb = 0; | |
179 | xfs_extlen_t align; | |
180 | int eof, error; | |
181 | ||
71ddabb9 | 182 | if (XFS_IS_REALTIME_INODE(ip)) |
dd9f438e NS |
183 | ; |
184 | /* | |
185 | * If mounted with the "-o swalloc" option, roundup the allocation | |
186 | * request to a stripe width boundary if the file size is >= | |
187 | * stripe width and we are allocating past the allocation eof. | |
188 | */ | |
189 | else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) && | |
9f6c92b9 | 190 | (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_swidth))) |
dd9f438e NS |
191 | new_last_fsb = roundup_64(*last_fsb, mp->m_swidth); |
192 | /* | |
193 | * Roundup the allocation request to a stripe unit (m_dalign) boundary | |
194 | * if the file size is >= stripe unit size, and we are allocating past | |
195 | * the allocation eof. | |
196 | */ | |
9f6c92b9 | 197 | else if (mp->m_dalign && (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_dalign))) |
dd9f438e NS |
198 | new_last_fsb = roundup_64(*last_fsb, mp->m_dalign); |
199 | ||
200 | /* | |
201 | * Always round up the allocation request to an extent boundary | |
202 | * (when file on a real-time subvolume or has di_extsize hint). | |
203 | */ | |
204 | if (extsize) { | |
205 | if (new_last_fsb) | |
206 | align = roundup_64(new_last_fsb, extsize); | |
207 | else | |
208 | align = extsize; | |
209 | new_last_fsb = roundup_64(*last_fsb, align); | |
210 | } | |
211 | ||
212 | if (new_last_fsb) { | |
541d7d3c | 213 | error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); |
dd9f438e NS |
214 | if (error) |
215 | return error; | |
216 | if (eof) | |
217 | *last_fsb = new_last_fsb; | |
218 | } | |
219 | return 0; | |
220 | } | |
221 | ||
572d95f4 NS |
222 | STATIC int |
223 | xfs_cmn_err_fsblock_zero( | |
224 | xfs_inode_t *ip, | |
225 | xfs_bmbt_irec_t *imap) | |
226 | { | |
227 | xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount, | |
228 | "Access to block zero in inode %llu " | |
229 | "start_block: %llx start_off: %llx " | |
230 | "blkcnt: %llx extent-state: %x\n", | |
231 | (unsigned long long)ip->i_ino, | |
232 | (unsigned long long)imap->br_startblock, | |
233 | (unsigned long long)imap->br_startoff, | |
234 | (unsigned long long)imap->br_blockcount, | |
235 | imap->br_state); | |
236 | return EFSCORRUPTED; | |
237 | } | |
238 | ||
b4ed4626 | 239 | STATIC int |
1da177e4 LT |
240 | xfs_iomap_write_direct( |
241 | xfs_inode_t *ip, | |
f403b7f4 | 242 | xfs_off_t offset, |
1da177e4 LT |
243 | size_t count, |
244 | int flags, | |
3070451e | 245 | xfs_bmbt_irec_t *imap, |
b4ed4626 | 246 | int *nmaps) |
1da177e4 LT |
247 | { |
248 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
249 | xfs_fileoff_t offset_fsb; |
250 | xfs_fileoff_t last_fsb; | |
dd9f438e | 251 | xfs_filblks_t count_fsb, resaligned; |
1da177e4 | 252 | xfs_fsblock_t firstfsb; |
dd9f438e | 253 | xfs_extlen_t extsz, temp; |
0116d935 | 254 | int nimaps; |
1da177e4 | 255 | int bmapi_flag; |
06d10dd9 | 256 | int quota_flag; |
1da177e4 LT |
257 | int rt; |
258 | xfs_trans_t *tp; | |
1da177e4 | 259 | xfs_bmap_free_t free_list; |
dd9f438e | 260 | uint qblocks, resblks, resrtextents; |
1da177e4 | 261 | int committed; |
dd9f438e | 262 | int error; |
1da177e4 LT |
263 | |
264 | /* | |
265 | * Make sure that the dquots are there. This doesn't hold | |
266 | * the ilock across a disk read. | |
267 | */ | |
7d095257 | 268 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 LT |
269 | if (error) |
270 | return XFS_ERROR(error); | |
271 | ||
dd9f438e | 272 | rt = XFS_IS_REALTIME_INODE(ip); |
957d0ebe | 273 | extsz = xfs_get_extsz_hint(ip); |
1da177e4 | 274 | |
957d0ebe DC |
275 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
276 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
9f6c92b9 LM |
277 | if ((offset + count) > ip->i_size) { |
278 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); | |
dd9f438e NS |
279 | if (error) |
280 | goto error_out; | |
1da177e4 | 281 | } else { |
3070451e | 282 | if (*nmaps && (imap->br_startblock == HOLESTARTBLOCK)) |
dd9f438e | 283 | last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
3070451e CH |
284 | imap->br_blockcount + |
285 | imap->br_startoff); | |
1da177e4 | 286 | } |
dd9f438e NS |
287 | count_fsb = last_fsb - offset_fsb; |
288 | ASSERT(count_fsb > 0); | |
289 | ||
290 | resaligned = count_fsb; | |
291 | if (unlikely(extsz)) { | |
292 | if ((temp = do_mod(offset_fsb, extsz))) | |
293 | resaligned += temp; | |
294 | if ((temp = do_mod(resaligned, extsz))) | |
295 | resaligned += extsz - temp; | |
296 | } | |
297 | ||
298 | if (unlikely(rt)) { | |
299 | resrtextents = qblocks = resaligned; | |
300 | resrtextents /= mp->m_sb.sb_rextsize; | |
84e1e99f DC |
301 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
302 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
303 | } else { | |
304 | resrtextents = 0; | |
dd9f438e | 305 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
84e1e99f DC |
306 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
307 | } | |
1da177e4 LT |
308 | |
309 | /* | |
06d10dd9 | 310 | * Allocate and setup the transaction |
1da177e4 LT |
311 | */ |
312 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
313 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
1da177e4 | 314 | error = xfs_trans_reserve(tp, resblks, |
d52b44d0 | 315 | XFS_WRITE_LOG_RES(mp), resrtextents, |
1da177e4 LT |
316 | XFS_TRANS_PERM_LOG_RES, |
317 | XFS_WRITE_LOG_COUNT); | |
1da177e4 | 318 | /* |
06d10dd9 | 319 | * Check for running out of space, note: need lock to return |
1da177e4 LT |
320 | */ |
321 | if (error) | |
1da177e4 | 322 | xfs_trans_cancel(tp, 0); |
1da177e4 | 323 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 324 | if (error) |
06d10dd9 | 325 | goto error_out; |
1da177e4 | 326 | |
7d095257 | 327 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
dd9f438e | 328 | if (error) |
1da177e4 | 329 | goto error1; |
1da177e4 | 330 | |
898621d5 | 331 | xfs_trans_ijoin(tp, ip); |
1da177e4 | 332 | |
dd9f438e | 333 | bmapi_flag = XFS_BMAPI_WRITE; |
ba87ea69 | 334 | if ((flags & BMAPI_DIRECT) && (offset < ip->i_size || extsz)) |
1da177e4 LT |
335 | bmapi_flag |= XFS_BMAPI_PREALLOC; |
336 | ||
337 | /* | |
3070451e CH |
338 | * Issue the xfs_bmapi() call to allocate the blocks. |
339 | * | |
340 | * From this point onwards we overwrite the imap pointer that the | |
341 | * caller gave to us. | |
1da177e4 | 342 | */ |
9d87c319 | 343 | xfs_bmap_init(&free_list, &firstfsb); |
06d10dd9 | 344 | nimaps = 1; |
541d7d3c | 345 | error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, bmapi_flag, |
3070451e | 346 | &firstfsb, 0, imap, &nimaps, &free_list); |
06d10dd9 | 347 | if (error) |
1da177e4 | 348 | goto error0; |
1da177e4 LT |
349 | |
350 | /* | |
06d10dd9 | 351 | * Complete the transaction |
1da177e4 | 352 | */ |
f7c99b6f | 353 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
06d10dd9 | 354 | if (error) |
1da177e4 | 355 | goto error0; |
1c72bf90 | 356 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
06d10dd9 | 357 | if (error) |
1da177e4 | 358 | goto error_out; |
1da177e4 | 359 | |
06d10dd9 NS |
360 | /* |
361 | * Copy any maps to caller's array and return any error. | |
362 | */ | |
1da177e4 | 363 | if (nimaps == 0) { |
572d95f4 NS |
364 | error = ENOSPC; |
365 | goto error_out; | |
366 | } | |
367 | ||
3070451e CH |
368 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) { |
369 | error = xfs_cmn_err_fsblock_zero(ip, imap); | |
1da177e4 LT |
370 | goto error_out; |
371 | } | |
372 | ||
1da177e4 | 373 | *nmaps = 1; |
1da177e4 LT |
374 | return 0; |
375 | ||
06d10dd9 | 376 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ |
1da177e4 | 377 | xfs_bmap_cancel(&free_list); |
7d095257 | 378 | xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
1da177e4 | 379 | |
06d10dd9 | 380 | error1: /* Just cancel transaction */ |
1da177e4 LT |
381 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); |
382 | *nmaps = 0; /* nothing set-up here */ | |
383 | ||
384 | error_out: | |
385 | return XFS_ERROR(error); | |
386 | } | |
387 | ||
dd9f438e | 388 | /* |
8de2bf93 DC |
389 | * If the caller is doing a write at the end of the file, then extend the |
390 | * allocation out to the file system's write iosize. We clean up any extra | |
391 | * space left over when the file is closed in xfs_inactive(). | |
dd9f438e NS |
392 | */ |
393 | STATIC int | |
394 | xfs_iomap_eof_want_preallocate( | |
395 | xfs_mount_t *mp, | |
541d7d3c | 396 | xfs_inode_t *ip, |
dd9f438e NS |
397 | xfs_off_t offset, |
398 | size_t count, | |
399 | int ioflag, | |
400 | xfs_bmbt_irec_t *imap, | |
401 | int nimaps, | |
402 | int *prealloc) | |
403 | { | |
404 | xfs_fileoff_t start_fsb; | |
405 | xfs_filblks_t count_fsb; | |
406 | xfs_fsblock_t firstblock; | |
407 | int n, error, imaps; | |
408 | ||
409 | *prealloc = 0; | |
8de2bf93 | 410 | if ((offset + count) <= ip->i_size) |
dd9f438e NS |
411 | return 0; |
412 | ||
413 | /* | |
414 | * If there are any real blocks past eof, then don't | |
415 | * do any speculative allocation. | |
416 | */ | |
417 | start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); | |
418 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); | |
419 | while (count_fsb > 0) { | |
420 | imaps = nimaps; | |
3ddb8fa9 | 421 | firstblock = NULLFSBLOCK; |
541d7d3c | 422 | error = xfs_bmapi(NULL, ip, start_fsb, count_fsb, 0, |
b4e9181e | 423 | &firstblock, 0, imap, &imaps, NULL); |
dd9f438e NS |
424 | if (error) |
425 | return error; | |
426 | for (n = 0; n < imaps; n++) { | |
427 | if ((imap[n].br_startblock != HOLESTARTBLOCK) && | |
428 | (imap[n].br_startblock != DELAYSTARTBLOCK)) | |
429 | return 0; | |
430 | start_fsb += imap[n].br_blockcount; | |
431 | count_fsb -= imap[n].br_blockcount; | |
432 | } | |
433 | } | |
434 | *prealloc = 1; | |
435 | return 0; | |
436 | } | |
437 | ||
b4ed4626 | 438 | STATIC int |
1da177e4 LT |
439 | xfs_iomap_write_delay( |
440 | xfs_inode_t *ip, | |
f403b7f4 | 441 | xfs_off_t offset, |
1da177e4 LT |
442 | size_t count, |
443 | int ioflag, | |
444 | xfs_bmbt_irec_t *ret_imap, | |
445 | int *nmaps) | |
446 | { | |
447 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
448 | xfs_fileoff_t offset_fsb; |
449 | xfs_fileoff_t last_fsb; | |
dd9f438e NS |
450 | xfs_off_t aligned_offset; |
451 | xfs_fileoff_t ioalign; | |
1da177e4 | 452 | xfs_fsblock_t firstblock; |
dd9f438e | 453 | xfs_extlen_t extsz; |
1da177e4 | 454 | int nimaps; |
1da177e4 | 455 | xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; |
8de2bf93 | 456 | int prealloc, flushed = 0; |
dd9f438e | 457 | int error; |
1da177e4 | 458 | |
579aa9ca | 459 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 LT |
460 | |
461 | /* | |
462 | * Make sure that the dquots are there. This doesn't hold | |
463 | * the ilock across a disk read. | |
464 | */ | |
7d095257 | 465 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 LT |
466 | if (error) |
467 | return XFS_ERROR(error); | |
468 | ||
957d0ebe | 469 | extsz = xfs_get_extsz_hint(ip); |
dd9f438e NS |
470 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
471 | ||
9f6c92b9 | 472 | error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, |
dd9f438e NS |
473 | ioflag, imap, XFS_WRITE_IMAPS, &prealloc); |
474 | if (error) | |
475 | return error; | |
1da177e4 | 476 | |
8de2bf93 | 477 | retry: |
dd9f438e | 478 | if (prealloc) { |
1da177e4 LT |
479 | aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); |
480 | ioalign = XFS_B_TO_FSBT(mp, aligned_offset); | |
dd9f438e NS |
481 | last_fsb = ioalign + mp->m_writeio_blocks; |
482 | } else { | |
483 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
1da177e4 | 484 | } |
1da177e4 | 485 | |
dd9f438e | 486 | if (prealloc || extsz) { |
9f6c92b9 | 487 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e | 488 | if (error) |
1da177e4 | 489 | return error; |
1da177e4 | 490 | } |
dd9f438e NS |
491 | |
492 | nimaps = XFS_WRITE_IMAPS; | |
493 | firstblock = NULLFSBLOCK; | |
541d7d3c | 494 | error = xfs_bmapi(NULL, ip, offset_fsb, |
1da177e4 LT |
495 | (xfs_filblks_t)(last_fsb - offset_fsb), |
496 | XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | | |
497 | XFS_BMAPI_ENTIRE, &firstblock, 1, imap, | |
b4e9181e | 498 | &nimaps, NULL); |
dd9f438e | 499 | if (error && (error != ENOSPC)) |
1da177e4 | 500 | return XFS_ERROR(error); |
dd9f438e | 501 | |
1da177e4 LT |
502 | /* |
503 | * If bmapi returned us nothing, and if we didn't get back EDQUOT, | |
8de2bf93 DC |
504 | * then we must have run out of space - flush all other inodes with |
505 | * delalloc blocks and retry without EOF preallocation. | |
1da177e4 LT |
506 | */ |
507 | if (nimaps == 0) { | |
0b1b213f | 508 | trace_xfs_delalloc_enospc(ip, offset, count); |
8de2bf93 | 509 | if (flushed) |
1da177e4 LT |
510 | return XFS_ERROR(ENOSPC); |
511 | ||
8de2bf93 DC |
512 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
513 | xfs_flush_inodes(ip); | |
514 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
515 | ||
516 | flushed = 1; | |
1da177e4 | 517 | error = 0; |
8de2bf93 | 518 | prealloc = 0; |
1da177e4 LT |
519 | goto retry; |
520 | } | |
521 | ||
86c4d623 | 522 | if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) |
572d95f4 | 523 | return xfs_cmn_err_fsblock_zero(ip, &imap[0]); |
dd9f438e NS |
524 | |
525 | *ret_imap = imap[0]; | |
526 | *nmaps = 1; | |
527 | ||
1da177e4 LT |
528 | return 0; |
529 | } | |
530 | ||
531 | /* | |
532 | * Pass in a delayed allocate extent, convert it to real extents; | |
533 | * return to the caller the extent we create which maps on top of | |
534 | * the originating callers request. | |
535 | * | |
536 | * Called without a lock on the inode. | |
e4143a1c DC |
537 | * |
538 | * We no longer bother to look at the incoming map - all we have to | |
539 | * guarantee is that whatever we allocate fills the required range. | |
1da177e4 | 540 | */ |
b4ed4626 | 541 | STATIC int |
1da177e4 LT |
542 | xfs_iomap_write_allocate( |
543 | xfs_inode_t *ip, | |
f403b7f4 | 544 | xfs_off_t offset, |
24e17b5f | 545 | size_t count, |
3070451e | 546 | xfs_bmbt_irec_t *imap, |
1da177e4 LT |
547 | int *retmap) |
548 | { | |
549 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
550 | xfs_fileoff_t offset_fsb, last_block; |
551 | xfs_fileoff_t end_fsb, map_start_fsb; | |
552 | xfs_fsblock_t first_block; | |
553 | xfs_bmap_free_t free_list; | |
554 | xfs_filblks_t count_fsb; | |
1da177e4 | 555 | xfs_trans_t *tp; |
e4143a1c | 556 | int nimaps, committed; |
1da177e4 LT |
557 | int error = 0; |
558 | int nres; | |
559 | ||
560 | *retmap = 0; | |
561 | ||
562 | /* | |
563 | * Make sure that the dquots are there. | |
564 | */ | |
7d095257 CH |
565 | error = xfs_qm_dqattach(ip, 0); |
566 | if (error) | |
1da177e4 LT |
567 | return XFS_ERROR(error); |
568 | ||
24e17b5f | 569 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
3070451e CH |
570 | count_fsb = imap->br_blockcount; |
571 | map_start_fsb = imap->br_startoff; | |
1da177e4 LT |
572 | |
573 | XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); | |
574 | ||
575 | while (count_fsb != 0) { | |
576 | /* | |
577 | * Set up a transaction with which to allocate the | |
578 | * backing store for the file. Do allocations in a | |
579 | * loop until we get some space in the range we are | |
580 | * interested in. The other space that might be allocated | |
581 | * is in the delayed allocation extent on which we sit | |
582 | * but before our buffer starts. | |
583 | */ | |
584 | ||
585 | nimaps = 0; | |
586 | while (nimaps == 0) { | |
587 | tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); | |
84e1e99f | 588 | tp->t_flags |= XFS_TRANS_RESERVE; |
1da177e4 LT |
589 | nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); |
590 | error = xfs_trans_reserve(tp, nres, | |
591 | XFS_WRITE_LOG_RES(mp), | |
592 | 0, XFS_TRANS_PERM_LOG_RES, | |
593 | XFS_WRITE_LOG_COUNT); | |
1da177e4 LT |
594 | if (error) { |
595 | xfs_trans_cancel(tp, 0); | |
596 | return XFS_ERROR(error); | |
597 | } | |
598 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
898621d5 | 599 | xfs_trans_ijoin(tp, ip); |
1da177e4 | 600 | |
9d87c319 | 601 | xfs_bmap_init(&free_list, &first_block); |
1da177e4 | 602 | |
1da177e4 | 603 | /* |
e4143a1c DC |
604 | * it is possible that the extents have changed since |
605 | * we did the read call as we dropped the ilock for a | |
606 | * while. We have to be careful about truncates or hole | |
607 | * punchs here - we are not allowed to allocate | |
608 | * non-delalloc blocks here. | |
609 | * | |
610 | * The only protection against truncation is the pages | |
611 | * for the range we are being asked to convert are | |
612 | * locked and hence a truncate will block on them | |
613 | * first. | |
614 | * | |
615 | * As a result, if we go beyond the range we really | |
616 | * need and hit an delalloc extent boundary followed by | |
617 | * a hole while we have excess blocks in the map, we | |
618 | * will fill the hole incorrectly and overrun the | |
619 | * transaction reservation. | |
620 | * | |
621 | * Using a single map prevents this as we are forced to | |
622 | * check each map we look for overlap with the desired | |
623 | * range and abort as soon as we find it. Also, given | |
624 | * that we only return a single map, having one beyond | |
625 | * what we can return is probably a bit silly. | |
626 | * | |
627 | * We also need to check that we don't go beyond EOF; | |
628 | * this is a truncate optimisation as a truncate sets | |
629 | * the new file size before block on the pages we | |
630 | * currently have locked under writeback. Because they | |
631 | * are about to be tossed, we don't need to write them | |
632 | * back.... | |
1da177e4 | 633 | */ |
e4143a1c | 634 | nimaps = 1; |
ba87ea69 | 635 | end_fsb = XFS_B_TO_FSB(mp, ip->i_size); |
7c9ef85c DC |
636 | error = xfs_bmap_last_offset(NULL, ip, &last_block, |
637 | XFS_DATA_FORK); | |
638 | if (error) | |
639 | goto trans_cancel; | |
640 | ||
1da177e4 LT |
641 | last_block = XFS_FILEOFF_MAX(last_block, end_fsb); |
642 | if ((map_start_fsb + count_fsb) > last_block) { | |
643 | count_fsb = last_block - map_start_fsb; | |
644 | if (count_fsb == 0) { | |
645 | error = EAGAIN; | |
646 | goto trans_cancel; | |
647 | } | |
648 | } | |
649 | ||
3070451e CH |
650 | /* |
651 | * Go get the actual blocks. | |
652 | * | |
653 | * From this point onwards we overwrite the imap | |
654 | * pointer that the caller gave to us. | |
655 | */ | |
541d7d3c | 656 | error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb, |
1da177e4 | 657 | XFS_BMAPI_WRITE, &first_block, 1, |
3070451e | 658 | imap, &nimaps, &free_list); |
1da177e4 LT |
659 | if (error) |
660 | goto trans_cancel; | |
661 | ||
f7c99b6f | 662 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
1da177e4 LT |
663 | if (error) |
664 | goto trans_cancel; | |
665 | ||
1c72bf90 | 666 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
667 | if (error) |
668 | goto error0; | |
669 | ||
670 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
671 | } | |
672 | ||
673 | /* | |
674 | * See if we were able to allocate an extent that | |
675 | * covers at least part of the callers request | |
676 | */ | |
3070451e CH |
677 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
678 | return xfs_cmn_err_fsblock_zero(ip, imap); | |
86c4d623 | 679 | |
3070451e CH |
680 | if ((offset_fsb >= imap->br_startoff) && |
681 | (offset_fsb < (imap->br_startoff + | |
682 | imap->br_blockcount))) { | |
e4143a1c DC |
683 | *retmap = 1; |
684 | XFS_STATS_INC(xs_xstrat_quick); | |
685 | return 0; | |
1da177e4 LT |
686 | } |
687 | ||
e4143a1c DC |
688 | /* |
689 | * So far we have not mapped the requested part of the | |
1da177e4 LT |
690 | * file, just surrounding data, try again. |
691 | */ | |
3070451e CH |
692 | count_fsb -= imap->br_blockcount; |
693 | map_start_fsb = imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
694 | } |
695 | ||
696 | trans_cancel: | |
697 | xfs_bmap_cancel(&free_list); | |
698 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
699 | error0: | |
700 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
701 | return XFS_ERROR(error); | |
702 | } | |
703 | ||
704 | int | |
705 | xfs_iomap_write_unwritten( | |
706 | xfs_inode_t *ip, | |
f403b7f4 | 707 | xfs_off_t offset, |
1da177e4 LT |
708 | size_t count) |
709 | { | |
710 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
711 | xfs_fileoff_t offset_fsb; |
712 | xfs_filblks_t count_fsb; | |
713 | xfs_filblks_t numblks_fsb; | |
dd9f438e NS |
714 | xfs_fsblock_t firstfsb; |
715 | int nimaps; | |
716 | xfs_trans_t *tp; | |
717 | xfs_bmbt_irec_t imap; | |
718 | xfs_bmap_free_t free_list; | |
719 | uint resblks; | |
1da177e4 LT |
720 | int committed; |
721 | int error; | |
1da177e4 | 722 | |
0b1b213f | 723 | trace_xfs_unwritten_convert(ip, offset, count); |
1da177e4 LT |
724 | |
725 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
726 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
727 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); | |
728 | ||
4ddd8bb1 LM |
729 | /* |
730 | * Reserve enough blocks in this transaction for two complete extent | |
731 | * btree splits. We may be converting the middle part of an unwritten | |
732 | * extent and in this case we will insert two new extents in the btree | |
733 | * each of which could cause a full split. | |
734 | * | |
735 | * This reservation amount will be used in the first call to | |
736 | * xfs_bmbt_split() to select an AG with enough space to satisfy the | |
737 | * rest of the operation. | |
738 | */ | |
dd9f438e | 739 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
1da177e4 | 740 | |
dd9f438e | 741 | do { |
1da177e4 LT |
742 | /* |
743 | * set up a transaction to convert the range of extents | |
744 | * from unwritten to real. Do allocations in a loop until | |
745 | * we have covered the range passed in. | |
80641dc6 CH |
746 | * |
747 | * Note that we open code the transaction allocation here | |
748 | * to pass KM_NOFS--we can't risk to recursing back into | |
749 | * the filesystem here as we might be asked to write out | |
750 | * the same inode that we complete here and might deadlock | |
751 | * on the iolock. | |
1da177e4 | 752 | */ |
80641dc6 CH |
753 | xfs_wait_for_freeze(mp, SB_FREEZE_TRANS); |
754 | tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS); | |
84e1e99f | 755 | tp->t_flags |= XFS_TRANS_RESERVE; |
dd9f438e | 756 | error = xfs_trans_reserve(tp, resblks, |
1da177e4 LT |
757 | XFS_WRITE_LOG_RES(mp), 0, |
758 | XFS_TRANS_PERM_LOG_RES, | |
759 | XFS_WRITE_LOG_COUNT); | |
760 | if (error) { | |
761 | xfs_trans_cancel(tp, 0); | |
572d95f4 | 762 | return XFS_ERROR(error); |
1da177e4 LT |
763 | } |
764 | ||
765 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
898621d5 | 766 | xfs_trans_ijoin(tp, ip); |
1da177e4 LT |
767 | |
768 | /* | |
769 | * Modify the unwritten extent state of the buffer. | |
770 | */ | |
9d87c319 | 771 | xfs_bmap_init(&free_list, &firstfsb); |
1da177e4 | 772 | nimaps = 1; |
541d7d3c | 773 | error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, |
dd9f438e | 774 | XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb, |
b4e9181e | 775 | 1, &imap, &nimaps, &free_list); |
1da177e4 LT |
776 | if (error) |
777 | goto error_on_bmapi_transaction; | |
778 | ||
f7c99b6f | 779 | error = xfs_bmap_finish(&(tp), &(free_list), &committed); |
1da177e4 LT |
780 | if (error) |
781 | goto error_on_bmapi_transaction; | |
782 | ||
1c72bf90 | 783 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
784 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
785 | if (error) | |
572d95f4 NS |
786 | return XFS_ERROR(error); |
787 | ||
86c4d623 | 788 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
572d95f4 | 789 | return xfs_cmn_err_fsblock_zero(ip, &imap); |
1da177e4 LT |
790 | |
791 | if ((numblks_fsb = imap.br_blockcount) == 0) { | |
792 | /* | |
793 | * The numblks_fsb value should always get | |
794 | * smaller, otherwise the loop is stuck. | |
795 | */ | |
796 | ASSERT(imap.br_blockcount); | |
797 | break; | |
798 | } | |
799 | offset_fsb += numblks_fsb; | |
800 | count_fsb -= numblks_fsb; | |
801 | } while (count_fsb > 0); | |
802 | ||
803 | return 0; | |
804 | ||
805 | error_on_bmapi_transaction: | |
806 | xfs_bmap_cancel(&free_list); | |
807 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); | |
808 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1da177e4 LT |
809 | return XFS_ERROR(error); |
810 | } |