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Commit | Line | Data |
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1da177e4 | 1 | /* |
3e57ecf6 | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
51446f5b | 3 | * Copyright (c) 2016 Christoph Hellwig. |
7b718769 | 4 | * All Rights Reserved. |
1da177e4 | 5 | * |
7b718769 NS |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
8 | * published by the Free Software Foundation. |
9 | * | |
7b718769 NS |
10 | * This program is distributed in the hope that it would be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
1da177e4 | 14 | * |
7b718769 NS |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write the Free Software Foundation, | |
17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 18 | */ |
3b3dce05 | 19 | #include <linux/iomap.h> |
1da177e4 | 20 | #include "xfs.h" |
1da177e4 | 21 | #include "xfs_fs.h" |
70a9883c | 22 | #include "xfs_shared.h" |
239880ef DC |
23 | #include "xfs_format.h" |
24 | #include "xfs_log_format.h" | |
25 | #include "xfs_trans_resv.h" | |
1da177e4 | 26 | #include "xfs_mount.h" |
3ab78df2 | 27 | #include "xfs_defer.h" |
1da177e4 | 28 | #include "xfs_inode.h" |
a844f451 | 29 | #include "xfs_btree.h" |
a4fbe6ab | 30 | #include "xfs_bmap_btree.h" |
1da177e4 | 31 | #include "xfs_bmap.h" |
68988114 | 32 | #include "xfs_bmap_util.h" |
1da177e4 | 33 | #include "xfs_error.h" |
a4fbe6ab | 34 | #include "xfs_trans.h" |
1da177e4 | 35 | #include "xfs_trans_space.h" |
1da177e4 | 36 | #include "xfs_iomap.h" |
0b1b213f | 37 | #include "xfs_trace.h" |
27b52867 | 38 | #include "xfs_icache.h" |
a4fbe6ab | 39 | #include "xfs_quota.h" |
76a4202a BF |
40 | #include "xfs_dquot_item.h" |
41 | #include "xfs_dquot.h" | |
1da177e4 | 42 | |
1da177e4 LT |
43 | |
44 | #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ | |
45 | << mp->m_writeio_log) | |
1da177e4 | 46 | |
e9c49736 CH |
47 | void |
48 | xfs_bmbt_to_iomap( | |
49 | struct xfs_inode *ip, | |
50 | struct iomap *iomap, | |
51 | struct xfs_bmbt_irec *imap) | |
52 | { | |
53 | struct xfs_mount *mp = ip->i_mount; | |
54 | ||
55 | if (imap->br_startblock == HOLESTARTBLOCK) { | |
56 | iomap->blkno = IOMAP_NULL_BLOCK; | |
57 | iomap->type = IOMAP_HOLE; | |
58 | } else if (imap->br_startblock == DELAYSTARTBLOCK) { | |
59 | iomap->blkno = IOMAP_NULL_BLOCK; | |
60 | iomap->type = IOMAP_DELALLOC; | |
61 | } else { | |
62 | iomap->blkno = xfs_fsb_to_db(ip, imap->br_startblock); | |
63 | if (imap->br_state == XFS_EXT_UNWRITTEN) | |
64 | iomap->type = IOMAP_UNWRITTEN; | |
65 | else | |
66 | iomap->type = IOMAP_MAPPED; | |
67 | } | |
68 | iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff); | |
69 | iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount); | |
70 | iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip)); | |
71 | } | |
72 | ||
f8e3a825 CH |
73 | static xfs_extlen_t |
74 | xfs_eof_alignment( | |
75 | struct xfs_inode *ip, | |
76 | xfs_extlen_t extsize) | |
dd9f438e | 77 | { |
f8e3a825 CH |
78 | struct xfs_mount *mp = ip->i_mount; |
79 | xfs_extlen_t align = 0; | |
dd9f438e | 80 | |
bf322d98 CH |
81 | if (!XFS_IS_REALTIME_INODE(ip)) { |
82 | /* | |
83 | * Round up the allocation request to a stripe unit | |
84 | * (m_dalign) boundary if the file size is >= stripe unit | |
85 | * size, and we are allocating past the allocation eof. | |
86 | * | |
87 | * If mounted with the "-o swalloc" option the alignment is | |
88 | * increased from the strip unit size to the stripe width. | |
89 | */ | |
90 | if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC)) | |
91 | align = mp->m_swidth; | |
92 | else if (mp->m_dalign) | |
93 | align = mp->m_dalign; | |
94 | ||
76b57302 PW |
95 | if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align)) |
96 | align = 0; | |
bf322d98 | 97 | } |
dd9f438e NS |
98 | |
99 | /* | |
100 | * Always round up the allocation request to an extent boundary | |
101 | * (when file on a real-time subvolume or has di_extsize hint). | |
102 | */ | |
103 | if (extsize) { | |
76b57302 PW |
104 | if (align) |
105 | align = roundup_64(align, extsize); | |
dd9f438e NS |
106 | else |
107 | align = extsize; | |
dd9f438e NS |
108 | } |
109 | ||
f8e3a825 CH |
110 | return align; |
111 | } | |
112 | ||
113 | STATIC int | |
114 | xfs_iomap_eof_align_last_fsb( | |
115 | struct xfs_inode *ip, | |
116 | xfs_extlen_t extsize, | |
117 | xfs_fileoff_t *last_fsb) | |
118 | { | |
119 | xfs_extlen_t align = xfs_eof_alignment(ip, extsize); | |
120 | ||
76b57302 PW |
121 | if (align) { |
122 | xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align); | |
f8e3a825 CH |
123 | int eof, error; |
124 | ||
541d7d3c | 125 | error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); |
dd9f438e NS |
126 | if (error) |
127 | return error; | |
128 | if (eof) | |
129 | *last_fsb = new_last_fsb; | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
572d95f4 | 134 | STATIC int |
6d4a8ecb | 135 | xfs_alert_fsblock_zero( |
572d95f4 NS |
136 | xfs_inode_t *ip, |
137 | xfs_bmbt_irec_t *imap) | |
138 | { | |
6a19d939 | 139 | xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO, |
572d95f4 NS |
140 | "Access to block zero in inode %llu " |
141 | "start_block: %llx start_off: %llx " | |
08e96e1a | 142 | "blkcnt: %llx extent-state: %x", |
572d95f4 NS |
143 | (unsigned long long)ip->i_ino, |
144 | (unsigned long long)imap->br_startblock, | |
145 | (unsigned long long)imap->br_startoff, | |
146 | (unsigned long long)imap->br_blockcount, | |
147 | imap->br_state); | |
2451337d | 148 | return -EFSCORRUPTED; |
572d95f4 NS |
149 | } |
150 | ||
a206c817 | 151 | int |
1da177e4 LT |
152 | xfs_iomap_write_direct( |
153 | xfs_inode_t *ip, | |
f403b7f4 | 154 | xfs_off_t offset, |
1da177e4 | 155 | size_t count, |
3070451e | 156 | xfs_bmbt_irec_t *imap, |
405f8042 | 157 | int nmaps) |
1da177e4 LT |
158 | { |
159 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
160 | xfs_fileoff_t offset_fsb; |
161 | xfs_fileoff_t last_fsb; | |
dd9f438e | 162 | xfs_filblks_t count_fsb, resaligned; |
1da177e4 | 163 | xfs_fsblock_t firstfsb; |
dd9f438e | 164 | xfs_extlen_t extsz, temp; |
0116d935 | 165 | int nimaps; |
06d10dd9 | 166 | int quota_flag; |
1da177e4 LT |
167 | int rt; |
168 | xfs_trans_t *tp; | |
2c3234d1 | 169 | struct xfs_defer_ops dfops; |
dd9f438e | 170 | uint qblocks, resblks, resrtextents; |
dd9f438e | 171 | int error; |
009c6e87 | 172 | int lockmode; |
1ca19157 | 173 | int bmapi_flags = XFS_BMAPI_PREALLOC; |
253f4911 | 174 | uint tflags = 0; |
1da177e4 | 175 | |
dd9f438e | 176 | rt = XFS_IS_REALTIME_INODE(ip); |
957d0ebe | 177 | extsz = xfs_get_extsz_hint(ip); |
009c6e87 BF |
178 | lockmode = XFS_ILOCK_SHARED; /* locked by caller */ |
179 | ||
180 | ASSERT(xfs_isilocked(ip, lockmode)); | |
1da177e4 | 181 | |
957d0ebe DC |
182 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
183 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
ce7ae151 | 184 | if ((offset + count) > XFS_ISIZE(ip)) { |
009c6e87 BF |
185 | /* |
186 | * Assert that the in-core extent list is present since this can | |
187 | * call xfs_iread_extents() and we only have the ilock shared. | |
188 | * This should be safe because the lock was held around a bmapi | |
189 | * call in the caller and we only need it to access the in-core | |
190 | * list. | |
191 | */ | |
192 | ASSERT(XFS_IFORK_PTR(ip, XFS_DATA_FORK)->if_flags & | |
193 | XFS_IFEXTENTS); | |
f8e3a825 | 194 | error = xfs_iomap_eof_align_last_fsb(ip, extsz, &last_fsb); |
dd9f438e | 195 | if (error) |
009c6e87 | 196 | goto out_unlock; |
1da177e4 | 197 | } else { |
405f8042 | 198 | if (nmaps && (imap->br_startblock == HOLESTARTBLOCK)) |
dd9f438e | 199 | last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
3070451e CH |
200 | imap->br_blockcount + |
201 | imap->br_startoff); | |
1da177e4 | 202 | } |
dd9f438e NS |
203 | count_fsb = last_fsb - offset_fsb; |
204 | ASSERT(count_fsb > 0); | |
205 | ||
206 | resaligned = count_fsb; | |
207 | if (unlikely(extsz)) { | |
208 | if ((temp = do_mod(offset_fsb, extsz))) | |
209 | resaligned += temp; | |
210 | if ((temp = do_mod(resaligned, extsz))) | |
211 | resaligned += extsz - temp; | |
212 | } | |
213 | ||
214 | if (unlikely(rt)) { | |
215 | resrtextents = qblocks = resaligned; | |
216 | resrtextents /= mp->m_sb.sb_rextsize; | |
84e1e99f DC |
217 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
218 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
219 | } else { | |
220 | resrtextents = 0; | |
dd9f438e | 221 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
84e1e99f DC |
222 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
223 | } | |
1da177e4 | 224 | |
009c6e87 BF |
225 | /* |
226 | * Drop the shared lock acquired by the caller, attach the dquot if | |
227 | * necessary and move on to transaction setup. | |
228 | */ | |
229 | xfs_iunlock(ip, lockmode); | |
230 | error = xfs_qm_dqattach(ip, 0); | |
231 | if (error) | |
232 | return error; | |
233 | ||
1ca19157 DC |
234 | /* |
235 | * For DAX, we do not allocate unwritten extents, but instead we zero | |
236 | * the block before we commit the transaction. Ideally we'd like to do | |
237 | * this outside the transaction context, but if we commit and then crash | |
238 | * we may not have zeroed the blocks and this will be exposed on | |
239 | * recovery of the allocation. Hence we must zero before commit. | |
3b0fe478 | 240 | * |
1ca19157 DC |
241 | * Further, if we are mapping unwritten extents here, we need to zero |
242 | * and convert them to written so that we don't need an unwritten extent | |
243 | * callback for DAX. This also means that we need to be able to dip into | |
3b0fe478 DC |
244 | * the reserve block pool for bmbt block allocation if there is no space |
245 | * left but we need to do unwritten extent conversion. | |
1ca19157 DC |
246 | */ |
247 | if (IS_DAX(VFS_I(ip))) { | |
248 | bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO; | |
3b0fe478 | 249 | if (ISUNWRITTEN(imap)) { |
253f4911 | 250 | tflags |= XFS_TRANS_RESERVE; |
3b0fe478 DC |
251 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
252 | } | |
1ca19157 | 253 | } |
253f4911 CH |
254 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, resrtextents, |
255 | tflags, &tp); | |
256 | if (error) | |
b474c7ae | 257 | return error; |
507630b2 | 258 | |
009c6e87 BF |
259 | lockmode = XFS_ILOCK_EXCL; |
260 | xfs_ilock(ip, lockmode); | |
1da177e4 | 261 | |
7d095257 | 262 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
dd9f438e | 263 | if (error) |
507630b2 | 264 | goto out_trans_cancel; |
1da177e4 | 265 | |
ddc3415a | 266 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 267 | |
1da177e4 | 268 | /* |
3070451e CH |
269 | * From this point onwards we overwrite the imap pointer that the |
270 | * caller gave to us. | |
1da177e4 | 271 | */ |
2c3234d1 | 272 | xfs_defer_init(&dfops, &firstfsb); |
06d10dd9 | 273 | nimaps = 1; |
d531d91d | 274 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
264e89ad | 275 | bmapi_flags, &firstfsb, resblks, imap, |
2c3234d1 | 276 | &nimaps, &dfops); |
06d10dd9 | 277 | if (error) |
507630b2 | 278 | goto out_bmap_cancel; |
1da177e4 LT |
279 | |
280 | /* | |
06d10dd9 | 281 | * Complete the transaction |
1da177e4 | 282 | */ |
2c3234d1 | 283 | error = xfs_defer_finish(&tp, &dfops, NULL); |
06d10dd9 | 284 | if (error) |
507630b2 | 285 | goto out_bmap_cancel; |
1ca19157 | 286 | |
70393313 | 287 | error = xfs_trans_commit(tp); |
06d10dd9 | 288 | if (error) |
507630b2 | 289 | goto out_unlock; |
1da177e4 | 290 | |
06d10dd9 NS |
291 | /* |
292 | * Copy any maps to caller's array and return any error. | |
293 | */ | |
1da177e4 | 294 | if (nimaps == 0) { |
2451337d | 295 | error = -ENOSPC; |
507630b2 | 296 | goto out_unlock; |
572d95f4 NS |
297 | } |
298 | ||
507630b2 | 299 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 300 | error = xfs_alert_fsblock_zero(ip, imap); |
1da177e4 | 301 | |
507630b2 | 302 | out_unlock: |
009c6e87 | 303 | xfs_iunlock(ip, lockmode); |
507630b2 | 304 | return error; |
1da177e4 | 305 | |
507630b2 | 306 | out_bmap_cancel: |
2c3234d1 | 307 | xfs_defer_cancel(&dfops); |
ea562ed6 | 308 | xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag); |
507630b2 | 309 | out_trans_cancel: |
4906e215 | 310 | xfs_trans_cancel(tp); |
507630b2 | 311 | goto out_unlock; |
1da177e4 LT |
312 | } |
313 | ||
76a4202a BF |
314 | STATIC bool |
315 | xfs_quota_need_throttle( | |
316 | struct xfs_inode *ip, | |
317 | int type, | |
318 | xfs_fsblock_t alloc_blocks) | |
319 | { | |
320 | struct xfs_dquot *dq = xfs_inode_dquot(ip, type); | |
321 | ||
322 | if (!dq || !xfs_this_quota_on(ip->i_mount, type)) | |
323 | return false; | |
324 | ||
325 | /* no hi watermark, no throttle */ | |
326 | if (!dq->q_prealloc_hi_wmark) | |
327 | return false; | |
328 | ||
329 | /* under the lo watermark, no throttle */ | |
330 | if (dq->q_res_bcount + alloc_blocks < dq->q_prealloc_lo_wmark) | |
331 | return false; | |
332 | ||
333 | return true; | |
334 | } | |
335 | ||
336 | STATIC void | |
337 | xfs_quota_calc_throttle( | |
338 | struct xfs_inode *ip, | |
339 | int type, | |
340 | xfs_fsblock_t *qblocks, | |
f074051f BF |
341 | int *qshift, |
342 | int64_t *qfreesp) | |
76a4202a BF |
343 | { |
344 | int64_t freesp; | |
345 | int shift = 0; | |
346 | struct xfs_dquot *dq = xfs_inode_dquot(ip, type); | |
347 | ||
5cca3f61 ES |
348 | /* no dq, or over hi wmark, squash the prealloc completely */ |
349 | if (!dq || dq->q_res_bcount >= dq->q_prealloc_hi_wmark) { | |
76a4202a | 350 | *qblocks = 0; |
f074051f | 351 | *qfreesp = 0; |
76a4202a BF |
352 | return; |
353 | } | |
354 | ||
355 | freesp = dq->q_prealloc_hi_wmark - dq->q_res_bcount; | |
356 | if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) { | |
357 | shift = 2; | |
358 | if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT]) | |
359 | shift += 2; | |
360 | if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT]) | |
361 | shift += 2; | |
362 | } | |
363 | ||
f074051f BF |
364 | if (freesp < *qfreesp) |
365 | *qfreesp = freesp; | |
366 | ||
76a4202a BF |
367 | /* only overwrite the throttle values if we are more aggressive */ |
368 | if ((freesp >> shift) < (*qblocks >> *qshift)) { | |
369 | *qblocks = freesp; | |
370 | *qshift = shift; | |
371 | } | |
372 | } | |
373 | ||
055388a3 | 374 | /* |
51446f5b CH |
375 | * If we are doing a write at the end of the file and there are no allocations |
376 | * past this one, then extend the allocation out to the file system's write | |
377 | * iosize. | |
378 | * | |
055388a3 | 379 | * If we don't have a user specified preallocation size, dynamically increase |
51446f5b | 380 | * the preallocation size as the size of the file grows. Cap the maximum size |
055388a3 DC |
381 | * at a single extent or less if the filesystem is near full. The closer the |
382 | * filesystem is to full, the smaller the maximum prealocation. | |
51446f5b CH |
383 | * |
384 | * As an exception we don't do any preallocation at all if the file is smaller | |
385 | * than the minimum preallocation and we are using the default dynamic | |
386 | * preallocation scheme, as it is likely this is the only write to the file that | |
387 | * is going to be done. | |
388 | * | |
389 | * We clean up any extra space left over when the file is closed in | |
390 | * xfs_inactive(). | |
055388a3 DC |
391 | */ |
392 | STATIC xfs_fsblock_t | |
393 | xfs_iomap_prealloc_size( | |
a1e16c26 | 394 | struct xfs_inode *ip, |
51446f5b CH |
395 | loff_t offset, |
396 | loff_t count, | |
397 | xfs_extnum_t idx, | |
398 | struct xfs_bmbt_irec *prev) | |
055388a3 | 399 | { |
51446f5b CH |
400 | struct xfs_mount *mp = ip->i_mount; |
401 | xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
3c58b5f8 BF |
402 | int shift = 0; |
403 | int64_t freesp; | |
76a4202a BF |
404 | xfs_fsblock_t qblocks; |
405 | int qshift = 0; | |
51446f5b CH |
406 | xfs_fsblock_t alloc_blocks = 0; |
407 | ||
408 | if (offset + count <= XFS_ISIZE(ip)) | |
409 | return 0; | |
410 | ||
411 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) && | |
412 | (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks))) | |
413 | return 0; | |
414 | ||
415 | /* | |
416 | * If an explicit allocsize is set, the file is small, or we | |
417 | * are writing behind a hole, then use the minimum prealloc: | |
418 | */ | |
419 | if ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) || | |
420 | XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) || | |
421 | idx == 0 || | |
422 | prev->br_startoff + prev->br_blockcount < offset_fsb) | |
423 | return mp->m_writeio_blocks; | |
055388a3 | 424 | |
51446f5b CH |
425 | /* |
426 | * Determine the initial size of the preallocation. We are beyond the | |
427 | * current EOF here, but we need to take into account whether this is | |
428 | * a sparse write or an extending write when determining the | |
429 | * preallocation size. Hence we need to look up the extent that ends | |
430 | * at the current write offset and use the result to determine the | |
431 | * preallocation size. | |
432 | * | |
433 | * If the extent is a hole, then preallocation is essentially disabled. | |
434 | * Otherwise we take the size of the preceding data extent as the basis | |
435 | * for the preallocation size. If the size of the extent is greater than | |
436 | * half the maximum extent length, then use the current offset as the | |
437 | * basis. This ensures that for large files the preallocation size | |
438 | * always extends to MAXEXTLEN rather than falling short due to things | |
439 | * like stripe unit/width alignment of real extents. | |
440 | */ | |
441 | if (prev->br_blockcount <= (MAXEXTLEN >> 1)) | |
442 | alloc_blocks = prev->br_blockcount << 1; | |
443 | else | |
444 | alloc_blocks = XFS_B_TO_FSB(mp, offset); | |
3c58b5f8 BF |
445 | if (!alloc_blocks) |
446 | goto check_writeio; | |
76a4202a | 447 | qblocks = alloc_blocks; |
3c58b5f8 | 448 | |
c9bdbdc0 BF |
449 | /* |
450 | * MAXEXTLEN is not a power of two value but we round the prealloc down | |
451 | * to the nearest power of two value after throttling. To prevent the | |
452 | * round down from unconditionally reducing the maximum supported prealloc | |
453 | * size, we round up first, apply appropriate throttling, round down and | |
454 | * cap the value to MAXEXTLEN. | |
455 | */ | |
456 | alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN), | |
457 | alloc_blocks); | |
3c58b5f8 | 458 | |
0d485ada | 459 | freesp = percpu_counter_read_positive(&mp->m_fdblocks); |
3c58b5f8 BF |
460 | if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) { |
461 | shift = 2; | |
462 | if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT]) | |
463 | shift++; | |
464 | if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT]) | |
465 | shift++; | |
466 | if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT]) | |
467 | shift++; | |
468 | if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT]) | |
469 | shift++; | |
055388a3 | 470 | } |
76a4202a BF |
471 | |
472 | /* | |
f074051f BF |
473 | * Check each quota to cap the prealloc size, provide a shift value to |
474 | * throttle with and adjust amount of available space. | |
76a4202a BF |
475 | */ |
476 | if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks)) | |
f074051f BF |
477 | xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift, |
478 | &freesp); | |
76a4202a | 479 | if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks)) |
f074051f BF |
480 | xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift, |
481 | &freesp); | |
76a4202a | 482 | if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks)) |
f074051f BF |
483 | xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift, |
484 | &freesp); | |
76a4202a BF |
485 | |
486 | /* | |
487 | * The final prealloc size is set to the minimum of free space available | |
488 | * in each of the quotas and the overall filesystem. | |
489 | * | |
490 | * The shift throttle value is set to the maximum value as determined by | |
491 | * the global low free space values and per-quota low free space values. | |
492 | */ | |
493 | alloc_blocks = MIN(alloc_blocks, qblocks); | |
494 | shift = MAX(shift, qshift); | |
495 | ||
3c58b5f8 BF |
496 | if (shift) |
497 | alloc_blocks >>= shift; | |
c9bdbdc0 BF |
498 | /* |
499 | * rounddown_pow_of_two() returns an undefined result if we pass in | |
500 | * alloc_blocks = 0. | |
501 | */ | |
502 | if (alloc_blocks) | |
503 | alloc_blocks = rounddown_pow_of_two(alloc_blocks); | |
504 | if (alloc_blocks > MAXEXTLEN) | |
505 | alloc_blocks = MAXEXTLEN; | |
3c58b5f8 BF |
506 | |
507 | /* | |
508 | * If we are still trying to allocate more space than is | |
509 | * available, squash the prealloc hard. This can happen if we | |
510 | * have a large file on a small filesystem and the above | |
511 | * lowspace thresholds are smaller than MAXEXTLEN. | |
512 | */ | |
513 | while (alloc_blocks && alloc_blocks >= freesp) | |
514 | alloc_blocks >>= 4; | |
3c58b5f8 | 515 | check_writeio: |
055388a3 DC |
516 | if (alloc_blocks < mp->m_writeio_blocks) |
517 | alloc_blocks = mp->m_writeio_blocks; | |
19cb7e38 BF |
518 | trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift, |
519 | mp->m_writeio_blocks); | |
055388a3 DC |
520 | return alloc_blocks; |
521 | } | |
522 | ||
51446f5b CH |
523 | static int |
524 | xfs_file_iomap_begin_delay( | |
525 | struct inode *inode, | |
526 | loff_t offset, | |
527 | loff_t count, | |
528 | unsigned flags, | |
529 | struct iomap *iomap) | |
1da177e4 | 530 | { |
51446f5b CH |
531 | struct xfs_inode *ip = XFS_I(inode); |
532 | struct xfs_mount *mp = ip->i_mount; | |
533 | struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); | |
534 | xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
535 | xfs_fileoff_t maxbytes_fsb = | |
536 | XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); | |
537 | xfs_fileoff_t end_fsb, orig_end_fsb; | |
538 | int error = 0, eof = 0; | |
539 | struct xfs_bmbt_irec got; | |
540 | struct xfs_bmbt_irec prev; | |
541 | xfs_extnum_t idx; | |
542 | ||
543 | ASSERT(!XFS_IS_REALTIME_INODE(ip)); | |
544 | ASSERT(!xfs_get_extsz_hint(ip)); | |
dd9f438e | 545 | |
51446f5b | 546 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 547 | |
51446f5b CH |
548 | if (unlikely(XFS_TEST_ERROR( |
549 | (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS && | |
550 | XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE), | |
551 | mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) { | |
552 | XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp); | |
553 | error = -EFSCORRUPTED; | |
554 | goto out_unlock; | |
555 | } | |
a1e16c26 | 556 | |
51446f5b | 557 | XFS_STATS_INC(mp, xs_blk_mapw); |
055388a3 | 558 | |
51446f5b CH |
559 | if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
560 | error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK); | |
561 | if (error) | |
562 | goto out_unlock; | |
1da177e4 | 563 | } |
1da177e4 | 564 | |
51446f5b CH |
565 | xfs_bmap_search_extents(ip, offset_fsb, XFS_DATA_FORK, &eof, &idx, |
566 | &got, &prev); | |
567 | if (!eof && got.br_startoff <= offset_fsb) { | |
568 | trace_xfs_iomap_found(ip, offset, count, 0, &got); | |
569 | goto done; | |
1da177e4 | 570 | } |
dd9f438e | 571 | |
51446f5b CH |
572 | error = xfs_qm_dqattach_locked(ip, 0); |
573 | if (error) | |
574 | goto out_unlock; | |
575 | ||
3ed9116e | 576 | /* |
51446f5b CH |
577 | * We cap the maximum length we map here to MAX_WRITEBACK_PAGES pages |
578 | * to keep the chunks of work done where somewhat symmetric with the | |
579 | * work writeback does. This is a completely arbitrary number pulled | |
580 | * out of thin air as a best guess for initial testing. | |
581 | * | |
582 | * Note that the values needs to be less than 32-bits wide until | |
583 | * the lower level functions are updated. | |
3ed9116e | 584 | */ |
51446f5b CH |
585 | count = min_t(loff_t, count, 1024 * PAGE_SIZE); |
586 | end_fsb = orig_end_fsb = | |
587 | min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb); | |
588 | ||
589 | if (eof) { | |
590 | xfs_fsblock_t prealloc_blocks; | |
3ed9116e | 591 | |
51446f5b CH |
592 | prealloc_blocks = |
593 | xfs_iomap_prealloc_size(ip, offset, count, idx, &prev); | |
594 | if (prealloc_blocks) { | |
595 | xfs_extlen_t align; | |
596 | xfs_off_t end_offset; | |
3ed9116e | 597 | |
51446f5b CH |
598 | end_offset = XFS_WRITEIO_ALIGN(mp, offset + count - 1); |
599 | end_fsb = XFS_B_TO_FSBT(mp, end_offset) + | |
600 | prealloc_blocks; | |
601 | ||
602 | align = xfs_eof_alignment(ip, 0); | |
603 | if (align) | |
604 | end_fsb = roundup_64(end_fsb, align); | |
605 | ||
606 | end_fsb = min(end_fsb, maxbytes_fsb); | |
607 | ASSERT(end_fsb > offset_fsb); | |
608 | } | |
609 | } | |
610 | ||
611 | retry: | |
612 | error = xfs_bmapi_reserve_delalloc(ip, offset_fsb, | |
613 | end_fsb - offset_fsb, &got, | |
614 | &prev, &idx, eof); | |
055388a3 DC |
615 | switch (error) { |
616 | case 0: | |
51446f5b | 617 | break; |
2451337d DC |
618 | case -ENOSPC: |
619 | case -EDQUOT: | |
51446f5b | 620 | /* retry without any preallocation */ |
0b1b213f | 621 | trace_xfs_delalloc_enospc(ip, offset, count); |
51446f5b CH |
622 | if (end_fsb != orig_end_fsb) { |
623 | end_fsb = orig_end_fsb; | |
9aa05000 | 624 | goto retry; |
055388a3 | 625 | } |
51446f5b CH |
626 | /*FALLTHRU*/ |
627 | default: | |
628 | goto out_unlock; | |
1da177e4 LT |
629 | } |
630 | ||
27b52867 BF |
631 | /* |
632 | * Tag the inode as speculatively preallocated so we can reclaim this | |
633 | * space on demand, if necessary. | |
634 | */ | |
51446f5b | 635 | if (end_fsb != orig_end_fsb) |
27b52867 BF |
636 | xfs_inode_set_eofblocks_tag(ip); |
637 | ||
51446f5b CH |
638 | trace_xfs_iomap_alloc(ip, offset, count, 0, &got); |
639 | done: | |
640 | if (isnullstartblock(got.br_startblock)) | |
641 | got.br_startblock = DELAYSTARTBLOCK; | |
642 | ||
643 | if (!got.br_startblock) { | |
644 | error = xfs_alert_fsblock_zero(ip, &got); | |
645 | if (error) | |
646 | goto out_unlock; | |
647 | } | |
648 | ||
649 | xfs_bmbt_to_iomap(ip, iomap, &got); | |
650 | ||
651 | out_unlock: | |
652 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
653 | return error; | |
1da177e4 LT |
654 | } |
655 | ||
656 | /* | |
657 | * Pass in a delayed allocate extent, convert it to real extents; | |
658 | * return to the caller the extent we create which maps on top of | |
659 | * the originating callers request. | |
660 | * | |
661 | * Called without a lock on the inode. | |
e4143a1c DC |
662 | * |
663 | * We no longer bother to look at the incoming map - all we have to | |
664 | * guarantee is that whatever we allocate fills the required range. | |
1da177e4 | 665 | */ |
a206c817 | 666 | int |
1da177e4 LT |
667 | xfs_iomap_write_allocate( |
668 | xfs_inode_t *ip, | |
f403b7f4 | 669 | xfs_off_t offset, |
405f8042 | 670 | xfs_bmbt_irec_t *imap) |
1da177e4 LT |
671 | { |
672 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
673 | xfs_fileoff_t offset_fsb, last_block; |
674 | xfs_fileoff_t end_fsb, map_start_fsb; | |
675 | xfs_fsblock_t first_block; | |
2c3234d1 | 676 | struct xfs_defer_ops dfops; |
1da177e4 | 677 | xfs_filblks_t count_fsb; |
1da177e4 | 678 | xfs_trans_t *tp; |
f6106efa | 679 | int nimaps; |
1da177e4 LT |
680 | int error = 0; |
681 | int nres; | |
682 | ||
1da177e4 LT |
683 | /* |
684 | * Make sure that the dquots are there. | |
685 | */ | |
7d095257 CH |
686 | error = xfs_qm_dqattach(ip, 0); |
687 | if (error) | |
b474c7ae | 688 | return error; |
1da177e4 | 689 | |
24e17b5f | 690 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
3070451e CH |
691 | count_fsb = imap->br_blockcount; |
692 | map_start_fsb = imap->br_startoff; | |
1da177e4 | 693 | |
ff6d6af2 | 694 | XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); |
1da177e4 LT |
695 | |
696 | while (count_fsb != 0) { | |
697 | /* | |
698 | * Set up a transaction with which to allocate the | |
699 | * backing store for the file. Do allocations in a | |
700 | * loop until we get some space in the range we are | |
701 | * interested in. The other space that might be allocated | |
702 | * is in the delayed allocation extent on which we sit | |
703 | * but before our buffer starts. | |
704 | */ | |
1da177e4 LT |
705 | nimaps = 0; |
706 | while (nimaps == 0) { | |
1da177e4 | 707 | nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); |
0af32fb4 CH |
708 | /* |
709 | * We have already reserved space for the extent and any | |
710 | * indirect blocks when creating the delalloc extent, | |
711 | * there is no need to reserve space in this transaction | |
712 | * again. | |
713 | */ | |
714 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, | |
253f4911 CH |
715 | 0, XFS_TRANS_RESERVE, &tp); |
716 | if (error) | |
b474c7ae | 717 | return error; |
253f4911 | 718 | |
1da177e4 | 719 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
ddc3415a | 720 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 721 | |
2c3234d1 | 722 | xfs_defer_init(&dfops, &first_block); |
1da177e4 | 723 | |
1da177e4 | 724 | /* |
e4143a1c DC |
725 | * it is possible that the extents have changed since |
726 | * we did the read call as we dropped the ilock for a | |
727 | * while. We have to be careful about truncates or hole | |
728 | * punchs here - we are not allowed to allocate | |
729 | * non-delalloc blocks here. | |
730 | * | |
731 | * The only protection against truncation is the pages | |
732 | * for the range we are being asked to convert are | |
733 | * locked and hence a truncate will block on them | |
734 | * first. | |
735 | * | |
736 | * As a result, if we go beyond the range we really | |
737 | * need and hit an delalloc extent boundary followed by | |
738 | * a hole while we have excess blocks in the map, we | |
739 | * will fill the hole incorrectly and overrun the | |
740 | * transaction reservation. | |
741 | * | |
742 | * Using a single map prevents this as we are forced to | |
743 | * check each map we look for overlap with the desired | |
744 | * range and abort as soon as we find it. Also, given | |
745 | * that we only return a single map, having one beyond | |
746 | * what we can return is probably a bit silly. | |
747 | * | |
748 | * We also need to check that we don't go beyond EOF; | |
749 | * this is a truncate optimisation as a truncate sets | |
750 | * the new file size before block on the pages we | |
751 | * currently have locked under writeback. Because they | |
752 | * are about to be tossed, we don't need to write them | |
753 | * back.... | |
1da177e4 | 754 | */ |
e4143a1c | 755 | nimaps = 1; |
ce7ae151 | 756 | end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)); |
7fb2cd4d | 757 | error = xfs_bmap_last_offset(ip, &last_block, |
7c9ef85c DC |
758 | XFS_DATA_FORK); |
759 | if (error) | |
760 | goto trans_cancel; | |
761 | ||
1da177e4 LT |
762 | last_block = XFS_FILEOFF_MAX(last_block, end_fsb); |
763 | if ((map_start_fsb + count_fsb) > last_block) { | |
764 | count_fsb = last_block - map_start_fsb; | |
765 | if (count_fsb == 0) { | |
2451337d | 766 | error = -EAGAIN; |
1da177e4 LT |
767 | goto trans_cancel; |
768 | } | |
769 | } | |
770 | ||
3070451e | 771 | /* |
3070451e CH |
772 | * From this point onwards we overwrite the imap |
773 | * pointer that the caller gave to us. | |
774 | */ | |
c0dc7828 | 775 | error = xfs_bmapi_write(tp, ip, map_start_fsb, |
dbd5c8c9 BF |
776 | count_fsb, 0, &first_block, |
777 | nres, imap, &nimaps, | |
2c3234d1 | 778 | &dfops); |
1da177e4 LT |
779 | if (error) |
780 | goto trans_cancel; | |
781 | ||
2c3234d1 | 782 | error = xfs_defer_finish(&tp, &dfops, NULL); |
1da177e4 LT |
783 | if (error) |
784 | goto trans_cancel; | |
785 | ||
70393313 | 786 | error = xfs_trans_commit(tp); |
1da177e4 LT |
787 | if (error) |
788 | goto error0; | |
789 | ||
790 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
791 | } | |
792 | ||
793 | /* | |
794 | * See if we were able to allocate an extent that | |
795 | * covers at least part of the callers request | |
796 | */ | |
3070451e | 797 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 798 | return xfs_alert_fsblock_zero(ip, imap); |
86c4d623 | 799 | |
3070451e CH |
800 | if ((offset_fsb >= imap->br_startoff) && |
801 | (offset_fsb < (imap->br_startoff + | |
802 | imap->br_blockcount))) { | |
ff6d6af2 | 803 | XFS_STATS_INC(mp, xs_xstrat_quick); |
e4143a1c | 804 | return 0; |
1da177e4 LT |
805 | } |
806 | ||
e4143a1c DC |
807 | /* |
808 | * So far we have not mapped the requested part of the | |
1da177e4 LT |
809 | * file, just surrounding data, try again. |
810 | */ | |
3070451e CH |
811 | count_fsb -= imap->br_blockcount; |
812 | map_start_fsb = imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
813 | } |
814 | ||
815 | trans_cancel: | |
2c3234d1 | 816 | xfs_defer_cancel(&dfops); |
4906e215 | 817 | xfs_trans_cancel(tp); |
1da177e4 LT |
818 | error0: |
819 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
b474c7ae | 820 | return error; |
1da177e4 LT |
821 | } |
822 | ||
823 | int | |
824 | xfs_iomap_write_unwritten( | |
825 | xfs_inode_t *ip, | |
f403b7f4 | 826 | xfs_off_t offset, |
d32057fc | 827 | xfs_off_t count) |
1da177e4 LT |
828 | { |
829 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
830 | xfs_fileoff_t offset_fsb; |
831 | xfs_filblks_t count_fsb; | |
832 | xfs_filblks_t numblks_fsb; | |
dd9f438e NS |
833 | xfs_fsblock_t firstfsb; |
834 | int nimaps; | |
835 | xfs_trans_t *tp; | |
836 | xfs_bmbt_irec_t imap; | |
2c3234d1 | 837 | struct xfs_defer_ops dfops; |
84803fb7 | 838 | xfs_fsize_t i_size; |
dd9f438e | 839 | uint resblks; |
1da177e4 | 840 | int error; |
1da177e4 | 841 | |
0b1b213f | 842 | trace_xfs_unwritten_convert(ip, offset, count); |
1da177e4 LT |
843 | |
844 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
845 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
846 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); | |
847 | ||
4ddd8bb1 LM |
848 | /* |
849 | * Reserve enough blocks in this transaction for two complete extent | |
850 | * btree splits. We may be converting the middle part of an unwritten | |
851 | * extent and in this case we will insert two new extents in the btree | |
852 | * each of which could cause a full split. | |
853 | * | |
854 | * This reservation amount will be used in the first call to | |
855 | * xfs_bmbt_split() to select an AG with enough space to satisfy the | |
856 | * rest of the operation. | |
857 | */ | |
dd9f438e | 858 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
1da177e4 | 859 | |
dd9f438e | 860 | do { |
1da177e4 | 861 | /* |
253f4911 | 862 | * Set up a transaction to convert the range of extents |
1da177e4 LT |
863 | * from unwritten to real. Do allocations in a loop until |
864 | * we have covered the range passed in. | |
80641dc6 | 865 | * |
253f4911 CH |
866 | * Note that we can't risk to recursing back into the filesystem |
867 | * here as we might be asked to write out the same inode that we | |
868 | * complete here and might deadlock on the iolock. | |
1da177e4 | 869 | */ |
253f4911 CH |
870 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, |
871 | XFS_TRANS_RESERVE | XFS_TRANS_NOFS, &tp); | |
872 | if (error) | |
b474c7ae | 873 | return error; |
1da177e4 LT |
874 | |
875 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
ddc3415a | 876 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 LT |
877 | |
878 | /* | |
879 | * Modify the unwritten extent state of the buffer. | |
880 | */ | |
2c3234d1 | 881 | xfs_defer_init(&dfops, &firstfsb); |
1da177e4 | 882 | nimaps = 1; |
c0dc7828 | 883 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
dbd5c8c9 | 884 | XFS_BMAPI_CONVERT, &firstfsb, resblks, |
2c3234d1 | 885 | &imap, &nimaps, &dfops); |
1da177e4 LT |
886 | if (error) |
887 | goto error_on_bmapi_transaction; | |
888 | ||
84803fb7 CH |
889 | /* |
890 | * Log the updated inode size as we go. We have to be careful | |
891 | * to only log it up to the actual write offset if it is | |
892 | * halfway into a block. | |
893 | */ | |
894 | i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb); | |
895 | if (i_size > offset + count) | |
896 | i_size = offset + count; | |
897 | ||
898 | i_size = xfs_new_eof(ip, i_size); | |
899 | if (i_size) { | |
900 | ip->i_d.di_size = i_size; | |
901 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
902 | } | |
903 | ||
2c3234d1 | 904 | error = xfs_defer_finish(&tp, &dfops, NULL); |
1da177e4 LT |
905 | if (error) |
906 | goto error_on_bmapi_transaction; | |
907 | ||
70393313 | 908 | error = xfs_trans_commit(tp); |
1da177e4 LT |
909 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
910 | if (error) | |
b474c7ae | 911 | return error; |
572d95f4 | 912 | |
86c4d623 | 913 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 914 | return xfs_alert_fsblock_zero(ip, &imap); |
1da177e4 LT |
915 | |
916 | if ((numblks_fsb = imap.br_blockcount) == 0) { | |
917 | /* | |
918 | * The numblks_fsb value should always get | |
919 | * smaller, otherwise the loop is stuck. | |
920 | */ | |
921 | ASSERT(imap.br_blockcount); | |
922 | break; | |
923 | } | |
924 | offset_fsb += numblks_fsb; | |
925 | count_fsb -= numblks_fsb; | |
926 | } while (count_fsb > 0); | |
927 | ||
928 | return 0; | |
929 | ||
930 | error_on_bmapi_transaction: | |
2c3234d1 | 931 | xfs_defer_cancel(&dfops); |
4906e215 | 932 | xfs_trans_cancel(tp); |
1da177e4 | 933 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
b474c7ae | 934 | return error; |
1da177e4 | 935 | } |
3b3dce05 | 936 | |
68a9f5e7 CH |
937 | static inline bool imap_needs_alloc(struct xfs_bmbt_irec *imap, int nimaps) |
938 | { | |
939 | return !nimaps || | |
940 | imap->br_startblock == HOLESTARTBLOCK || | |
941 | imap->br_startblock == DELAYSTARTBLOCK; | |
942 | } | |
943 | ||
944 | static int | |
945 | xfs_file_iomap_begin( | |
946 | struct inode *inode, | |
947 | loff_t offset, | |
948 | loff_t length, | |
949 | unsigned flags, | |
950 | struct iomap *iomap) | |
951 | { | |
952 | struct xfs_inode *ip = XFS_I(inode); | |
953 | struct xfs_mount *mp = ip->i_mount; | |
954 | struct xfs_bmbt_irec imap; | |
955 | xfs_fileoff_t offset_fsb, end_fsb; | |
956 | int nimaps = 1, error = 0; | |
957 | ||
958 | if (XFS_FORCED_SHUTDOWN(mp)) | |
959 | return -EIO; | |
960 | ||
51446f5b CH |
961 | if ((flags & IOMAP_WRITE) && !xfs_get_extsz_hint(ip)) { |
962 | return xfs_file_iomap_begin_delay(inode, offset, length, flags, | |
963 | iomap); | |
964 | } | |
965 | ||
68a9f5e7 CH |
966 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
967 | ||
968 | ASSERT(offset <= mp->m_super->s_maxbytes); | |
969 | if ((xfs_fsize_t)offset + length > mp->m_super->s_maxbytes) | |
970 | length = mp->m_super->s_maxbytes - offset; | |
971 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
972 | end_fsb = XFS_B_TO_FSB(mp, offset + length); | |
973 | ||
974 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap, | |
975 | &nimaps, XFS_BMAPI_ENTIRE); | |
976 | if (error) { | |
977 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
978 | return error; | |
979 | } | |
980 | ||
981 | if ((flags & IOMAP_WRITE) && imap_needs_alloc(&imap, nimaps)) { | |
982 | /* | |
983 | * We cap the maximum length we map here to MAX_WRITEBACK_PAGES | |
984 | * pages to keep the chunks of work done where somewhat symmetric | |
985 | * with the work writeback does. This is a completely arbitrary | |
986 | * number pulled out of thin air as a best guess for initial | |
987 | * testing. | |
988 | * | |
989 | * Note that the values needs to be less than 32-bits wide until | |
990 | * the lower level functions are updated. | |
991 | */ | |
992 | length = min_t(loff_t, length, 1024 * PAGE_SIZE); | |
51446f5b CH |
993 | /* |
994 | * xfs_iomap_write_direct() expects the shared lock. It | |
995 | * is unlocked on return. | |
996 | */ | |
997 | xfs_ilock_demote(ip, XFS_ILOCK_EXCL); | |
998 | error = xfs_iomap_write_direct(ip, offset, length, &imap, | |
999 | nimaps); | |
68a9f5e7 CH |
1000 | if (error) |
1001 | return error; | |
1002 | ||
1003 | trace_xfs_iomap_alloc(ip, offset, length, 0, &imap); | |
68a9f5e7 | 1004 | } else { |
b95a2127 CH |
1005 | ASSERT(nimaps); |
1006 | ||
68a9f5e7 | 1007 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
b95a2127 | 1008 | trace_xfs_iomap_found(ip, offset, length, 0, &imap); |
68a9f5e7 CH |
1009 | } |
1010 | ||
b95a2127 | 1011 | xfs_bmbt_to_iomap(ip, iomap, &imap); |
68a9f5e7 CH |
1012 | return 0; |
1013 | } | |
1014 | ||
1015 | static int | |
1016 | xfs_file_iomap_end_delalloc( | |
1017 | struct xfs_inode *ip, | |
1018 | loff_t offset, | |
1019 | loff_t length, | |
1020 | ssize_t written) | |
1021 | { | |
1022 | struct xfs_mount *mp = ip->i_mount; | |
1023 | xfs_fileoff_t start_fsb; | |
1024 | xfs_fileoff_t end_fsb; | |
1025 | int error = 0; | |
1026 | ||
1027 | start_fsb = XFS_B_TO_FSB(mp, offset + written); | |
1028 | end_fsb = XFS_B_TO_FSB(mp, offset + length); | |
1029 | ||
1030 | /* | |
1031 | * Trim back delalloc blocks if we didn't manage to write the whole | |
1032 | * range reserved. | |
1033 | * | |
1034 | * We don't need to care about racing delalloc as we hold i_mutex | |
1035 | * across the reserve/allocate/unreserve calls. If there are delalloc | |
1036 | * blocks in the range, they are ours. | |
1037 | */ | |
1038 | if (start_fsb < end_fsb) { | |
1039 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1040 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, | |
1041 | end_fsb - start_fsb); | |
1042 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1043 | ||
1044 | if (error && !XFS_FORCED_SHUTDOWN(mp)) { | |
1045 | xfs_alert(mp, "%s: unable to clean up ino %lld", | |
1046 | __func__, ip->i_ino); | |
1047 | return error; | |
1048 | } | |
1049 | } | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | static int | |
1055 | xfs_file_iomap_end( | |
1056 | struct inode *inode, | |
1057 | loff_t offset, | |
1058 | loff_t length, | |
1059 | ssize_t written, | |
1060 | unsigned flags, | |
1061 | struct iomap *iomap) | |
1062 | { | |
1063 | if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC) | |
1064 | return xfs_file_iomap_end_delalloc(XFS_I(inode), offset, | |
1065 | length, written); | |
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | struct iomap_ops xfs_iomap_ops = { | |
1070 | .iomap_begin = xfs_file_iomap_begin, | |
1071 | .iomap_end = xfs_file_iomap_end, | |
1072 | }; | |
1d4795e7 CH |
1073 | |
1074 | static int | |
1075 | xfs_xattr_iomap_begin( | |
1076 | struct inode *inode, | |
1077 | loff_t offset, | |
1078 | loff_t length, | |
1079 | unsigned flags, | |
1080 | struct iomap *iomap) | |
1081 | { | |
1082 | struct xfs_inode *ip = XFS_I(inode); | |
1083 | struct xfs_mount *mp = ip->i_mount; | |
1084 | xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1085 | xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length); | |
1086 | struct xfs_bmbt_irec imap; | |
1087 | int nimaps = 1, error = 0; | |
1088 | unsigned lockmode; | |
1089 | ||
1090 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1091 | return -EIO; | |
1092 | ||
1093 | lockmode = xfs_ilock_data_map_shared(ip); | |
1094 | ||
1095 | /* if there are no attribute fork or extents, return ENOENT */ | |
1096 | if (XFS_IFORK_Q(ip) || !ip->i_d.di_anextents) { | |
1097 | error = -ENOENT; | |
1098 | goto out_unlock; | |
1099 | } | |
1100 | ||
1101 | ASSERT(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL); | |
1102 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap, | |
1103 | &nimaps, XFS_BMAPI_ENTIRE | XFS_BMAPI_ATTRFORK); | |
1104 | out_unlock: | |
1105 | xfs_iunlock(ip, lockmode); | |
1106 | ||
1107 | if (!error) { | |
1108 | ASSERT(nimaps); | |
1109 | xfs_bmbt_to_iomap(ip, iomap, &imap); | |
1110 | } | |
1111 | ||
1112 | return error; | |
1113 | } | |
1114 | ||
1115 | struct iomap_ops xfs_xattr_iomap_ops = { | |
1116 | .iomap_begin = xfs_xattr_iomap_begin, | |
1117 | }; |