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 LT |
21 | #include "xfs_log.h" |
22 | #include "xfs_trans.h" | |
23 | #include "xfs_sb.h" | |
24 | #include "xfs_ag.h" | |
1da177e4 | 25 | #include "xfs_alloc.h" |
1da177e4 LT |
26 | #include "xfs_quota.h" |
27 | #include "xfs_mount.h" | |
1da177e4 | 28 | #include "xfs_bmap_btree.h" |
a844f451 | 29 | #include "xfs_alloc_btree.h" |
1da177e4 | 30 | #include "xfs_ialloc_btree.h" |
1da177e4 LT |
31 | #include "xfs_dinode.h" |
32 | #include "xfs_inode.h" | |
84803fb7 | 33 | #include "xfs_inode_item.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; | |
bf322d98 | 60 | xfs_extlen_t align = 0; |
dd9f438e NS |
61 | int eof, error; |
62 | ||
bf322d98 CH |
63 | if (!XFS_IS_REALTIME_INODE(ip)) { |
64 | /* | |
65 | * Round up the allocation request to a stripe unit | |
66 | * (m_dalign) boundary if the file size is >= stripe unit | |
67 | * size, and we are allocating past the allocation eof. | |
68 | * | |
69 | * If mounted with the "-o swalloc" option the alignment is | |
70 | * increased from the strip unit size to the stripe width. | |
71 | */ | |
72 | if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC)) | |
73 | align = mp->m_swidth; | |
74 | else if (mp->m_dalign) | |
75 | align = mp->m_dalign; | |
76 | ||
ce7ae151 | 77 | if (align && XFS_ISIZE(ip) >= XFS_FSB_TO_B(mp, align)) |
bf322d98 CH |
78 | new_last_fsb = roundup_64(*last_fsb, align); |
79 | } | |
dd9f438e NS |
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 | 143 | |
507630b2 | 144 | error = xfs_qm_dqattach(ip, 0); |
1da177e4 LT |
145 | if (error) |
146 | return XFS_ERROR(error); | |
147 | ||
dd9f438e | 148 | rt = XFS_IS_REALTIME_INODE(ip); |
957d0ebe | 149 | extsz = xfs_get_extsz_hint(ip); |
1da177e4 | 150 | |
957d0ebe DC |
151 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
152 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
ce7ae151 | 153 | if ((offset + count) > XFS_ISIZE(ip)) { |
9f6c92b9 | 154 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e | 155 | if (error) |
507630b2 | 156 | return XFS_ERROR(error); |
1da177e4 | 157 | } else { |
405f8042 | 158 | if (nmaps && (imap->br_startblock == HOLESTARTBLOCK)) |
dd9f438e | 159 | last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
3070451e CH |
160 | imap->br_blockcount + |
161 | imap->br_startoff); | |
1da177e4 | 162 | } |
dd9f438e NS |
163 | count_fsb = last_fsb - offset_fsb; |
164 | ASSERT(count_fsb > 0); | |
165 | ||
166 | resaligned = count_fsb; | |
167 | if (unlikely(extsz)) { | |
168 | if ((temp = do_mod(offset_fsb, extsz))) | |
169 | resaligned += temp; | |
170 | if ((temp = do_mod(resaligned, extsz))) | |
171 | resaligned += extsz - temp; | |
172 | } | |
173 | ||
174 | if (unlikely(rt)) { | |
175 | resrtextents = qblocks = resaligned; | |
176 | resrtextents /= mp->m_sb.sb_rextsize; | |
84e1e99f DC |
177 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
178 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
179 | } else { | |
180 | resrtextents = 0; | |
dd9f438e | 181 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
84e1e99f DC |
182 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
183 | } | |
1da177e4 LT |
184 | |
185 | /* | |
06d10dd9 | 186 | * Allocate and setup the transaction |
1da177e4 | 187 | */ |
1da177e4 | 188 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); |
1da177e4 | 189 | error = xfs_trans_reserve(tp, resblks, |
d52b44d0 | 190 | XFS_WRITE_LOG_RES(mp), resrtextents, |
1da177e4 LT |
191 | XFS_TRANS_PERM_LOG_RES, |
192 | XFS_WRITE_LOG_COUNT); | |
1da177e4 | 193 | /* |
06d10dd9 | 194 | * Check for running out of space, note: need lock to return |
1da177e4 | 195 | */ |
507630b2 | 196 | if (error) { |
1da177e4 | 197 | xfs_trans_cancel(tp, 0); |
507630b2 DC |
198 | return XFS_ERROR(error); |
199 | } | |
200 | ||
1da177e4 | 201 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 202 | |
7d095257 | 203 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
dd9f438e | 204 | if (error) |
507630b2 | 205 | goto out_trans_cancel; |
1da177e4 | 206 | |
ddc3415a | 207 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 208 | |
c0dc7828 | 209 | bmapi_flag = 0; |
ce7ae151 | 210 | if (offset < XFS_ISIZE(ip) || extsz) |
1da177e4 LT |
211 | bmapi_flag |= XFS_BMAPI_PREALLOC; |
212 | ||
213 | /* | |
3070451e CH |
214 | * From this point onwards we overwrite the imap pointer that the |
215 | * caller gave to us. | |
1da177e4 | 216 | */ |
9d87c319 | 217 | xfs_bmap_init(&free_list, &firstfsb); |
06d10dd9 | 218 | nimaps = 1; |
c0dc7828 DC |
219 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flag, |
220 | &firstfsb, 0, imap, &nimaps, &free_list); | |
06d10dd9 | 221 | if (error) |
507630b2 | 222 | goto out_bmap_cancel; |
1da177e4 LT |
223 | |
224 | /* | |
06d10dd9 | 225 | * Complete the transaction |
1da177e4 | 226 | */ |
f7c99b6f | 227 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
06d10dd9 | 228 | if (error) |
507630b2 | 229 | goto out_bmap_cancel; |
1c72bf90 | 230 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
06d10dd9 | 231 | if (error) |
507630b2 | 232 | goto out_unlock; |
1da177e4 | 233 | |
06d10dd9 NS |
234 | /* |
235 | * Copy any maps to caller's array and return any error. | |
236 | */ | |
1da177e4 | 237 | if (nimaps == 0) { |
507630b2 DC |
238 | error = XFS_ERROR(ENOSPC); |
239 | goto out_unlock; | |
572d95f4 NS |
240 | } |
241 | ||
507630b2 | 242 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 243 | error = xfs_alert_fsblock_zero(ip, imap); |
1da177e4 | 244 | |
507630b2 DC |
245 | out_unlock: |
246 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
247 | return error; | |
1da177e4 | 248 | |
507630b2 | 249 | out_bmap_cancel: |
1da177e4 | 250 | xfs_bmap_cancel(&free_list); |
7d095257 | 251 | xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
507630b2 | 252 | out_trans_cancel: |
1da177e4 | 253 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); |
507630b2 | 254 | goto out_unlock; |
1da177e4 LT |
255 | } |
256 | ||
dd9f438e | 257 | /* |
8de2bf93 DC |
258 | * If the caller is doing a write at the end of the file, then extend the |
259 | * allocation out to the file system's write iosize. We clean up any extra | |
260 | * space left over when the file is closed in xfs_inactive(). | |
055388a3 DC |
261 | * |
262 | * If we find we already have delalloc preallocation beyond EOF, don't do more | |
263 | * preallocation as it it not needed. | |
dd9f438e NS |
264 | */ |
265 | STATIC int | |
266 | xfs_iomap_eof_want_preallocate( | |
267 | xfs_mount_t *mp, | |
541d7d3c | 268 | xfs_inode_t *ip, |
dd9f438e NS |
269 | xfs_off_t offset, |
270 | size_t count, | |
dd9f438e NS |
271 | xfs_bmbt_irec_t *imap, |
272 | int nimaps, | |
273 | int *prealloc) | |
274 | { | |
275 | xfs_fileoff_t start_fsb; | |
276 | xfs_filblks_t count_fsb; | |
277 | xfs_fsblock_t firstblock; | |
278 | int n, error, imaps; | |
055388a3 | 279 | int found_delalloc = 0; |
dd9f438e NS |
280 | |
281 | *prealloc = 0; | |
ce7ae151 | 282 | if (offset + count <= XFS_ISIZE(ip)) |
dd9f438e NS |
283 | return 0; |
284 | ||
285 | /* | |
286 | * If there are any real blocks past eof, then don't | |
287 | * do any speculative allocation. | |
288 | */ | |
289 | start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); | |
290 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); | |
291 | while (count_fsb > 0) { | |
292 | imaps = nimaps; | |
3ddb8fa9 | 293 | firstblock = NULLFSBLOCK; |
5c8ed202 DC |
294 | error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps, |
295 | 0); | |
dd9f438e NS |
296 | if (error) |
297 | return error; | |
298 | for (n = 0; n < imaps; n++) { | |
299 | if ((imap[n].br_startblock != HOLESTARTBLOCK) && | |
300 | (imap[n].br_startblock != DELAYSTARTBLOCK)) | |
301 | return 0; | |
302 | start_fsb += imap[n].br_blockcount; | |
303 | count_fsb -= imap[n].br_blockcount; | |
055388a3 DC |
304 | |
305 | if (imap[n].br_startblock == DELAYSTARTBLOCK) | |
306 | found_delalloc = 1; | |
dd9f438e NS |
307 | } |
308 | } | |
055388a3 DC |
309 | if (!found_delalloc) |
310 | *prealloc = 1; | |
dd9f438e NS |
311 | return 0; |
312 | } | |
313 | ||
055388a3 DC |
314 | /* |
315 | * If we don't have a user specified preallocation size, dynamically increase | |
316 | * the preallocation size as the size of the file grows. Cap the maximum size | |
317 | * at a single extent or less if the filesystem is near full. The closer the | |
318 | * filesystem is to full, the smaller the maximum prealocation. | |
319 | */ | |
320 | STATIC xfs_fsblock_t | |
321 | xfs_iomap_prealloc_size( | |
322 | struct xfs_mount *mp, | |
323 | struct xfs_inode *ip) | |
324 | { | |
325 | xfs_fsblock_t alloc_blocks = 0; | |
326 | ||
327 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { | |
328 | int shift = 0; | |
329 | int64_t freesp; | |
330 | ||
b8fc8263 DC |
331 | /* |
332 | * rounddown_pow_of_two() returns an undefined result | |
333 | * if we pass in alloc_blocks = 0. Hence the "+ 1" to | |
334 | * ensure we always pass in a non-zero value. | |
335 | */ | |
ce7ae151 | 336 | alloc_blocks = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)) + 1; |
055388a3 DC |
337 | alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN, |
338 | rounddown_pow_of_two(alloc_blocks)); | |
339 | ||
340 | xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); | |
341 | freesp = mp->m_sb.sb_fdblocks; | |
342 | if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) { | |
343 | shift = 2; | |
344 | if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT]) | |
345 | shift++; | |
346 | if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT]) | |
347 | shift++; | |
348 | if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT]) | |
349 | shift++; | |
350 | if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT]) | |
351 | shift++; | |
352 | } | |
353 | if (shift) | |
354 | alloc_blocks >>= shift; | |
355 | } | |
356 | ||
357 | if (alloc_blocks < mp->m_writeio_blocks) | |
358 | alloc_blocks = mp->m_writeio_blocks; | |
359 | ||
360 | return alloc_blocks; | |
361 | } | |
362 | ||
a206c817 | 363 | int |
1da177e4 LT |
364 | xfs_iomap_write_delay( |
365 | xfs_inode_t *ip, | |
f403b7f4 | 366 | xfs_off_t offset, |
1da177e4 | 367 | size_t count, |
405f8042 | 368 | xfs_bmbt_irec_t *ret_imap) |
1da177e4 LT |
369 | { |
370 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
371 | xfs_fileoff_t offset_fsb; |
372 | xfs_fileoff_t last_fsb; | |
dd9f438e NS |
373 | xfs_off_t aligned_offset; |
374 | xfs_fileoff_t ioalign; | |
dd9f438e | 375 | xfs_extlen_t extsz; |
1da177e4 | 376 | int nimaps; |
1da177e4 | 377 | xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; |
8de2bf93 | 378 | int prealloc, flushed = 0; |
dd9f438e | 379 | int error; |
1da177e4 | 380 | |
579aa9ca | 381 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 LT |
382 | |
383 | /* | |
384 | * Make sure that the dquots are there. This doesn't hold | |
385 | * the ilock across a disk read. | |
386 | */ | |
7d095257 | 387 | error = xfs_qm_dqattach_locked(ip, 0); |
1da177e4 LT |
388 | if (error) |
389 | return XFS_ERROR(error); | |
390 | ||
957d0ebe | 391 | extsz = xfs_get_extsz_hint(ip); |
dd9f438e NS |
392 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
393 | ||
055388a3 | 394 | |
9f6c92b9 | 395 | error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, |
405f8042 | 396 | imap, XFS_WRITE_IMAPS, &prealloc); |
dd9f438e NS |
397 | if (error) |
398 | return error; | |
1da177e4 | 399 | |
8de2bf93 | 400 | retry: |
dd9f438e | 401 | if (prealloc) { |
055388a3 DC |
402 | xfs_fsblock_t alloc_blocks = xfs_iomap_prealloc_size(mp, ip); |
403 | ||
1da177e4 LT |
404 | aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); |
405 | ioalign = XFS_B_TO_FSBT(mp, aligned_offset); | |
055388a3 | 406 | last_fsb = ioalign + alloc_blocks; |
dd9f438e NS |
407 | } else { |
408 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
1da177e4 | 409 | } |
1da177e4 | 410 | |
dd9f438e | 411 | if (prealloc || extsz) { |
9f6c92b9 | 412 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
dd9f438e | 413 | if (error) |
1da177e4 | 414 | return error; |
1da177e4 | 415 | } |
dd9f438e | 416 | |
3ed9116e DC |
417 | /* |
418 | * Make sure preallocation does not create extents beyond the range we | |
419 | * actually support in this filesystem. | |
420 | */ | |
421 | if (last_fsb > XFS_B_TO_FSB(mp, mp->m_maxioffset)) | |
422 | last_fsb = XFS_B_TO_FSB(mp, mp->m_maxioffset); | |
423 | ||
424 | ASSERT(last_fsb > offset_fsb); | |
425 | ||
dd9f438e | 426 | nimaps = XFS_WRITE_IMAPS; |
4403280a CH |
427 | error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb, |
428 | imap, &nimaps, XFS_BMAPI_ENTIRE); | |
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))) |
6d4a8ecb | 462 | return xfs_alert_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); | |
ddc3415a | 533 | xfs_trans_ijoin(tp, ip, 0); |
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; |
ce7ae151 | 569 | end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)); |
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 | 584 | /* |
3070451e CH |
585 | * From this point onwards we overwrite the imap |
586 | * pointer that the caller gave to us. | |
587 | */ | |
c0dc7828 DC |
588 | error = xfs_bmapi_write(tp, ip, map_start_fsb, |
589 | count_fsb, 0, &first_block, 1, | |
590 | imap, &nimaps, &free_list); | |
1da177e4 LT |
591 | if (error) |
592 | goto trans_cancel; | |
593 | ||
f7c99b6f | 594 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
1da177e4 LT |
595 | if (error) |
596 | goto trans_cancel; | |
597 | ||
1c72bf90 | 598 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
599 | if (error) |
600 | goto error0; | |
601 | ||
602 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
603 | } | |
604 | ||
605 | /* | |
606 | * See if we were able to allocate an extent that | |
607 | * covers at least part of the callers request | |
608 | */ | |
3070451e | 609 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 610 | return xfs_alert_fsblock_zero(ip, imap); |
86c4d623 | 611 | |
3070451e CH |
612 | if ((offset_fsb >= imap->br_startoff) && |
613 | (offset_fsb < (imap->br_startoff + | |
614 | imap->br_blockcount))) { | |
e4143a1c DC |
615 | XFS_STATS_INC(xs_xstrat_quick); |
616 | return 0; | |
1da177e4 LT |
617 | } |
618 | ||
e4143a1c DC |
619 | /* |
620 | * So far we have not mapped the requested part of the | |
1da177e4 LT |
621 | * file, just surrounding data, try again. |
622 | */ | |
3070451e CH |
623 | count_fsb -= imap->br_blockcount; |
624 | map_start_fsb = imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
625 | } |
626 | ||
627 | trans_cancel: | |
628 | xfs_bmap_cancel(&free_list); | |
629 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
630 | error0: | |
631 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
632 | return XFS_ERROR(error); | |
633 | } | |
634 | ||
635 | int | |
636 | xfs_iomap_write_unwritten( | |
637 | xfs_inode_t *ip, | |
f403b7f4 | 638 | xfs_off_t offset, |
1da177e4 LT |
639 | size_t count) |
640 | { | |
641 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
642 | xfs_fileoff_t offset_fsb; |
643 | xfs_filblks_t count_fsb; | |
644 | xfs_filblks_t numblks_fsb; | |
dd9f438e NS |
645 | xfs_fsblock_t firstfsb; |
646 | int nimaps; | |
647 | xfs_trans_t *tp; | |
648 | xfs_bmbt_irec_t imap; | |
649 | xfs_bmap_free_t free_list; | |
84803fb7 | 650 | xfs_fsize_t i_size; |
dd9f438e | 651 | uint resblks; |
1da177e4 LT |
652 | int committed; |
653 | int error; | |
1da177e4 | 654 | |
0b1b213f | 655 | trace_xfs_unwritten_convert(ip, offset, count); |
1da177e4 LT |
656 | |
657 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
658 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
659 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); | |
660 | ||
4ddd8bb1 LM |
661 | /* |
662 | * Reserve enough blocks in this transaction for two complete extent | |
663 | * btree splits. We may be converting the middle part of an unwritten | |
664 | * extent and in this case we will insert two new extents in the btree | |
665 | * each of which could cause a full split. | |
666 | * | |
667 | * This reservation amount will be used in the first call to | |
668 | * xfs_bmbt_split() to select an AG with enough space to satisfy the | |
669 | * rest of the operation. | |
670 | */ | |
dd9f438e | 671 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
1da177e4 | 672 | |
dd9f438e | 673 | do { |
1da177e4 LT |
674 | /* |
675 | * set up a transaction to convert the range of extents | |
676 | * from unwritten to real. Do allocations in a loop until | |
677 | * we have covered the range passed in. | |
80641dc6 CH |
678 | * |
679 | * Note that we open code the transaction allocation here | |
680 | * to pass KM_NOFS--we can't risk to recursing back into | |
681 | * the filesystem here as we might be asked to write out | |
682 | * the same inode that we complete here and might deadlock | |
683 | * on the iolock. | |
1da177e4 | 684 | */ |
80641dc6 CH |
685 | xfs_wait_for_freeze(mp, SB_FREEZE_TRANS); |
686 | tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS); | |
84e1e99f | 687 | tp->t_flags |= XFS_TRANS_RESERVE; |
dd9f438e | 688 | error = xfs_trans_reserve(tp, resblks, |
1da177e4 LT |
689 | XFS_WRITE_LOG_RES(mp), 0, |
690 | XFS_TRANS_PERM_LOG_RES, | |
691 | XFS_WRITE_LOG_COUNT); | |
692 | if (error) { | |
693 | xfs_trans_cancel(tp, 0); | |
572d95f4 | 694 | return XFS_ERROR(error); |
1da177e4 LT |
695 | } |
696 | ||
697 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
ddc3415a | 698 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 LT |
699 | |
700 | /* | |
701 | * Modify the unwritten extent state of the buffer. | |
702 | */ | |
9d87c319 | 703 | xfs_bmap_init(&free_list, &firstfsb); |
1da177e4 | 704 | nimaps = 1; |
c0dc7828 DC |
705 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
706 | XFS_BMAPI_CONVERT, &firstfsb, | |
b4e9181e | 707 | 1, &imap, &nimaps, &free_list); |
1da177e4 LT |
708 | if (error) |
709 | goto error_on_bmapi_transaction; | |
710 | ||
84803fb7 CH |
711 | /* |
712 | * Log the updated inode size as we go. We have to be careful | |
713 | * to only log it up to the actual write offset if it is | |
714 | * halfway into a block. | |
715 | */ | |
716 | i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb); | |
717 | if (i_size > offset + count) | |
718 | i_size = offset + count; | |
719 | ||
720 | i_size = xfs_new_eof(ip, i_size); | |
721 | if (i_size) { | |
722 | ip->i_d.di_size = i_size; | |
723 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
724 | } | |
725 | ||
726 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
1da177e4 LT |
727 | if (error) |
728 | goto error_on_bmapi_transaction; | |
729 | ||
1c72bf90 | 730 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
731 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
732 | if (error) | |
572d95f4 NS |
733 | return XFS_ERROR(error); |
734 | ||
86c4d623 | 735 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 736 | return xfs_alert_fsblock_zero(ip, &imap); |
1da177e4 LT |
737 | |
738 | if ((numblks_fsb = imap.br_blockcount) == 0) { | |
739 | /* | |
740 | * The numblks_fsb value should always get | |
741 | * smaller, otherwise the loop is stuck. | |
742 | */ | |
743 | ASSERT(imap.br_blockcount); | |
744 | break; | |
745 | } | |
746 | offset_fsb += numblks_fsb; | |
747 | count_fsb -= numblks_fsb; | |
748 | } while (count_fsb > 0); | |
749 | ||
750 | return 0; | |
751 | ||
752 | error_on_bmapi_transaction: | |
753 | xfs_bmap_cancel(&free_list); | |
754 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); | |
755 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1da177e4 LT |
756 | return XFS_ERROR(error); |
757 | } |