Commit | Line | Data |
---|---|---|
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" |
e9e899a2 | 33 | #include "xfs_errortag.h" |
1da177e4 | 34 | #include "xfs_error.h" |
a4fbe6ab | 35 | #include "xfs_trans.h" |
1da177e4 | 36 | #include "xfs_trans_space.h" |
a39e596b | 37 | #include "xfs_inode_item.h" |
1da177e4 | 38 | #include "xfs_iomap.h" |
0b1b213f | 39 | #include "xfs_trace.h" |
27b52867 | 40 | #include "xfs_icache.h" |
a4fbe6ab | 41 | #include "xfs_quota.h" |
76a4202a BF |
42 | #include "xfs_dquot_item.h" |
43 | #include "xfs_dquot.h" | |
2a06705c | 44 | #include "xfs_reflink.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | |
47 | #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ | |
48 | << mp->m_writeio_log) | |
1da177e4 | 49 | |
e9c49736 CH |
50 | void |
51 | xfs_bmbt_to_iomap( | |
52 | struct xfs_inode *ip, | |
53 | struct iomap *iomap, | |
54 | struct xfs_bmbt_irec *imap) | |
55 | { | |
56 | struct xfs_mount *mp = ip->i_mount; | |
57 | ||
58 | if (imap->br_startblock == HOLESTARTBLOCK) { | |
19fe5f64 | 59 | iomap->addr = IOMAP_NULL_ADDR; |
e9c49736 CH |
60 | iomap->type = IOMAP_HOLE; |
61 | } else if (imap->br_startblock == DELAYSTARTBLOCK) { | |
19fe5f64 | 62 | iomap->addr = IOMAP_NULL_ADDR; |
e9c49736 CH |
63 | iomap->type = IOMAP_DELALLOC; |
64 | } else { | |
19fe5f64 | 65 | iomap->addr = BBTOB(xfs_fsb_to_db(ip, imap->br_startblock)); |
e9c49736 CH |
66 | if (imap->br_state == XFS_EXT_UNWRITTEN) |
67 | iomap->type = IOMAP_UNWRITTEN; | |
68 | else | |
69 | iomap->type = IOMAP_MAPPED; | |
70 | } | |
71 | iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff); | |
72 | iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount); | |
73 | iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip)); | |
486aff5e | 74 | iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip)); |
e9c49736 CH |
75 | } |
76 | ||
f7ca3522 | 77 | xfs_extlen_t |
f8e3a825 CH |
78 | xfs_eof_alignment( |
79 | struct xfs_inode *ip, | |
80 | xfs_extlen_t extsize) | |
dd9f438e | 81 | { |
f8e3a825 CH |
82 | struct xfs_mount *mp = ip->i_mount; |
83 | xfs_extlen_t align = 0; | |
dd9f438e | 84 | |
bf322d98 CH |
85 | if (!XFS_IS_REALTIME_INODE(ip)) { |
86 | /* | |
87 | * Round up the allocation request to a stripe unit | |
88 | * (m_dalign) boundary if the file size is >= stripe unit | |
89 | * size, and we are allocating past the allocation eof. | |
90 | * | |
91 | * If mounted with the "-o swalloc" option the alignment is | |
92 | * increased from the strip unit size to the stripe width. | |
93 | */ | |
94 | if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC)) | |
95 | align = mp->m_swidth; | |
96 | else if (mp->m_dalign) | |
97 | align = mp->m_dalign; | |
98 | ||
76b57302 PW |
99 | if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align)) |
100 | align = 0; | |
bf322d98 | 101 | } |
dd9f438e NS |
102 | |
103 | /* | |
104 | * Always round up the allocation request to an extent boundary | |
105 | * (when file on a real-time subvolume or has di_extsize hint). | |
106 | */ | |
107 | if (extsize) { | |
76b57302 PW |
108 | if (align) |
109 | align = roundup_64(align, extsize); | |
dd9f438e NS |
110 | else |
111 | align = extsize; | |
dd9f438e NS |
112 | } |
113 | ||
f8e3a825 CH |
114 | return align; |
115 | } | |
116 | ||
117 | STATIC int | |
118 | xfs_iomap_eof_align_last_fsb( | |
119 | struct xfs_inode *ip, | |
120 | xfs_extlen_t extsize, | |
121 | xfs_fileoff_t *last_fsb) | |
122 | { | |
123 | xfs_extlen_t align = xfs_eof_alignment(ip, extsize); | |
124 | ||
76b57302 PW |
125 | if (align) { |
126 | xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align); | |
f8e3a825 CH |
127 | int eof, error; |
128 | ||
541d7d3c | 129 | error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); |
dd9f438e NS |
130 | if (error) |
131 | return error; | |
132 | if (eof) | |
133 | *last_fsb = new_last_fsb; | |
134 | } | |
135 | return 0; | |
136 | } | |
137 | ||
572d95f4 | 138 | STATIC int |
6d4a8ecb | 139 | xfs_alert_fsblock_zero( |
572d95f4 NS |
140 | xfs_inode_t *ip, |
141 | xfs_bmbt_irec_t *imap) | |
142 | { | |
6a19d939 | 143 | xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO, |
572d95f4 NS |
144 | "Access to block zero in inode %llu " |
145 | "start_block: %llx start_off: %llx " | |
08e96e1a | 146 | "blkcnt: %llx extent-state: %x", |
572d95f4 NS |
147 | (unsigned long long)ip->i_ino, |
148 | (unsigned long long)imap->br_startblock, | |
149 | (unsigned long long)imap->br_startoff, | |
150 | (unsigned long long)imap->br_blockcount, | |
151 | imap->br_state); | |
2451337d | 152 | return -EFSCORRUPTED; |
572d95f4 NS |
153 | } |
154 | ||
a206c817 | 155 | int |
1da177e4 LT |
156 | xfs_iomap_write_direct( |
157 | xfs_inode_t *ip, | |
f403b7f4 | 158 | xfs_off_t offset, |
1da177e4 | 159 | size_t count, |
3070451e | 160 | xfs_bmbt_irec_t *imap, |
405f8042 | 161 | int nmaps) |
1da177e4 LT |
162 | { |
163 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
164 | xfs_fileoff_t offset_fsb; |
165 | xfs_fileoff_t last_fsb; | |
dd9f438e | 166 | xfs_filblks_t count_fsb, resaligned; |
1da177e4 | 167 | xfs_fsblock_t firstfsb; |
f13eb205 | 168 | xfs_extlen_t extsz; |
0116d935 | 169 | int nimaps; |
06d10dd9 | 170 | int quota_flag; |
1da177e4 LT |
171 | int rt; |
172 | xfs_trans_t *tp; | |
2c3234d1 | 173 | struct xfs_defer_ops dfops; |
dd9f438e | 174 | uint qblocks, resblks, resrtextents; |
dd9f438e | 175 | int error; |
009c6e87 | 176 | int lockmode; |
1ca19157 | 177 | int bmapi_flags = XFS_BMAPI_PREALLOC; |
253f4911 | 178 | uint tflags = 0; |
1da177e4 | 179 | |
dd9f438e | 180 | rt = XFS_IS_REALTIME_INODE(ip); |
957d0ebe | 181 | extsz = xfs_get_extsz_hint(ip); |
009c6e87 BF |
182 | lockmode = XFS_ILOCK_SHARED; /* locked by caller */ |
183 | ||
184 | ASSERT(xfs_isilocked(ip, lockmode)); | |
1da177e4 | 185 | |
957d0ebe DC |
186 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
187 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); | |
ce7ae151 | 188 | if ((offset + count) > XFS_ISIZE(ip)) { |
009c6e87 BF |
189 | /* |
190 | * Assert that the in-core extent list is present since this can | |
191 | * call xfs_iread_extents() and we only have the ilock shared. | |
192 | * This should be safe because the lock was held around a bmapi | |
193 | * call in the caller and we only need it to access the in-core | |
194 | * list. | |
195 | */ | |
196 | ASSERT(XFS_IFORK_PTR(ip, XFS_DATA_FORK)->if_flags & | |
197 | XFS_IFEXTENTS); | |
f8e3a825 | 198 | error = xfs_iomap_eof_align_last_fsb(ip, extsz, &last_fsb); |
dd9f438e | 199 | if (error) |
009c6e87 | 200 | goto out_unlock; |
1da177e4 | 201 | } else { |
405f8042 | 202 | if (nmaps && (imap->br_startblock == HOLESTARTBLOCK)) |
dd9f438e | 203 | last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
3070451e CH |
204 | imap->br_blockcount + |
205 | imap->br_startoff); | |
1da177e4 | 206 | } |
dd9f438e NS |
207 | count_fsb = last_fsb - offset_fsb; |
208 | ASSERT(count_fsb > 0); | |
f13eb205 | 209 | resaligned = xfs_aligned_fsb_count(offset_fsb, count_fsb, extsz); |
dd9f438e NS |
210 | |
211 | if (unlikely(rt)) { | |
212 | resrtextents = qblocks = resaligned; | |
213 | resrtextents /= mp->m_sb.sb_rextsize; | |
84e1e99f DC |
214 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
215 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
216 | } else { | |
217 | resrtextents = 0; | |
dd9f438e | 218 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
84e1e99f DC |
219 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
220 | } | |
1da177e4 | 221 | |
009c6e87 BF |
222 | /* |
223 | * Drop the shared lock acquired by the caller, attach the dquot if | |
224 | * necessary and move on to transaction setup. | |
225 | */ | |
226 | xfs_iunlock(ip, lockmode); | |
227 | error = xfs_qm_dqattach(ip, 0); | |
228 | if (error) | |
229 | return error; | |
230 | ||
1ca19157 DC |
231 | /* |
232 | * For DAX, we do not allocate unwritten extents, but instead we zero | |
233 | * the block before we commit the transaction. Ideally we'd like to do | |
234 | * this outside the transaction context, but if we commit and then crash | |
235 | * we may not have zeroed the blocks and this will be exposed on | |
236 | * recovery of the allocation. Hence we must zero before commit. | |
3b0fe478 | 237 | * |
1ca19157 DC |
238 | * Further, if we are mapping unwritten extents here, we need to zero |
239 | * and convert them to written so that we don't need an unwritten extent | |
240 | * callback for DAX. This also means that we need to be able to dip into | |
3b0fe478 DC |
241 | * the reserve block pool for bmbt block allocation if there is no space |
242 | * left but we need to do unwritten extent conversion. | |
1ca19157 DC |
243 | */ |
244 | if (IS_DAX(VFS_I(ip))) { | |
245 | bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO; | |
63fbb4c1 | 246 | if (imap->br_state == XFS_EXT_UNWRITTEN) { |
253f4911 | 247 | tflags |= XFS_TRANS_RESERVE; |
3b0fe478 DC |
248 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
249 | } | |
1ca19157 | 250 | } |
253f4911 CH |
251 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, resrtextents, |
252 | tflags, &tp); | |
253 | if (error) | |
b474c7ae | 254 | return error; |
507630b2 | 255 | |
009c6e87 BF |
256 | lockmode = XFS_ILOCK_EXCL; |
257 | xfs_ilock(ip, lockmode); | |
1da177e4 | 258 | |
7d095257 | 259 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
dd9f438e | 260 | if (error) |
507630b2 | 261 | goto out_trans_cancel; |
1da177e4 | 262 | |
ddc3415a | 263 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 264 | |
1da177e4 | 265 | /* |
3070451e CH |
266 | * From this point onwards we overwrite the imap pointer that the |
267 | * caller gave to us. | |
1da177e4 | 268 | */ |
2c3234d1 | 269 | xfs_defer_init(&dfops, &firstfsb); |
06d10dd9 | 270 | nimaps = 1; |
d531d91d | 271 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
264e89ad | 272 | bmapi_flags, &firstfsb, resblks, imap, |
2c3234d1 | 273 | &nimaps, &dfops); |
06d10dd9 | 274 | if (error) |
507630b2 | 275 | goto out_bmap_cancel; |
1da177e4 LT |
276 | |
277 | /* | |
06d10dd9 | 278 | * Complete the transaction |
1da177e4 | 279 | */ |
8ad7c629 | 280 | error = xfs_defer_finish(&tp, &dfops); |
06d10dd9 | 281 | if (error) |
507630b2 | 282 | goto out_bmap_cancel; |
1ca19157 | 283 | |
70393313 | 284 | error = xfs_trans_commit(tp); |
06d10dd9 | 285 | if (error) |
507630b2 | 286 | goto out_unlock; |
1da177e4 | 287 | |
06d10dd9 NS |
288 | /* |
289 | * Copy any maps to caller's array and return any error. | |
290 | */ | |
1da177e4 | 291 | if (nimaps == 0) { |
2451337d | 292 | error = -ENOSPC; |
507630b2 | 293 | goto out_unlock; |
572d95f4 NS |
294 | } |
295 | ||
507630b2 | 296 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 297 | error = xfs_alert_fsblock_zero(ip, imap); |
1da177e4 | 298 | |
507630b2 | 299 | out_unlock: |
009c6e87 | 300 | xfs_iunlock(ip, lockmode); |
507630b2 | 301 | return error; |
1da177e4 | 302 | |
507630b2 | 303 | out_bmap_cancel: |
2c3234d1 | 304 | xfs_defer_cancel(&dfops); |
ea562ed6 | 305 | xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag); |
507630b2 | 306 | out_trans_cancel: |
4906e215 | 307 | xfs_trans_cancel(tp); |
507630b2 | 308 | goto out_unlock; |
1da177e4 LT |
309 | } |
310 | ||
76a4202a BF |
311 | STATIC bool |
312 | xfs_quota_need_throttle( | |
313 | struct xfs_inode *ip, | |
314 | int type, | |
315 | xfs_fsblock_t alloc_blocks) | |
316 | { | |
317 | struct xfs_dquot *dq = xfs_inode_dquot(ip, type); | |
318 | ||
319 | if (!dq || !xfs_this_quota_on(ip->i_mount, type)) | |
320 | return false; | |
321 | ||
322 | /* no hi watermark, no throttle */ | |
323 | if (!dq->q_prealloc_hi_wmark) | |
324 | return false; | |
325 | ||
326 | /* under the lo watermark, no throttle */ | |
327 | if (dq->q_res_bcount + alloc_blocks < dq->q_prealloc_lo_wmark) | |
328 | return false; | |
329 | ||
330 | return true; | |
331 | } | |
332 | ||
333 | STATIC void | |
334 | xfs_quota_calc_throttle( | |
335 | struct xfs_inode *ip, | |
336 | int type, | |
337 | xfs_fsblock_t *qblocks, | |
f074051f BF |
338 | int *qshift, |
339 | int64_t *qfreesp) | |
76a4202a BF |
340 | { |
341 | int64_t freesp; | |
342 | int shift = 0; | |
343 | struct xfs_dquot *dq = xfs_inode_dquot(ip, type); | |
344 | ||
5cca3f61 ES |
345 | /* no dq, or over hi wmark, squash the prealloc completely */ |
346 | if (!dq || dq->q_res_bcount >= dq->q_prealloc_hi_wmark) { | |
76a4202a | 347 | *qblocks = 0; |
f074051f | 348 | *qfreesp = 0; |
76a4202a BF |
349 | return; |
350 | } | |
351 | ||
352 | freesp = dq->q_prealloc_hi_wmark - dq->q_res_bcount; | |
353 | if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) { | |
354 | shift = 2; | |
355 | if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT]) | |
356 | shift += 2; | |
357 | if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT]) | |
358 | shift += 2; | |
359 | } | |
360 | ||
f074051f BF |
361 | if (freesp < *qfreesp) |
362 | *qfreesp = freesp; | |
363 | ||
76a4202a BF |
364 | /* only overwrite the throttle values if we are more aggressive */ |
365 | if ((freesp >> shift) < (*qblocks >> *qshift)) { | |
366 | *qblocks = freesp; | |
367 | *qshift = shift; | |
368 | } | |
369 | } | |
370 | ||
055388a3 | 371 | /* |
51446f5b CH |
372 | * If we are doing a write at the end of the file and there are no allocations |
373 | * past this one, then extend the allocation out to the file system's write | |
374 | * iosize. | |
375 | * | |
055388a3 | 376 | * If we don't have a user specified preallocation size, dynamically increase |
51446f5b | 377 | * the preallocation size as the size of the file grows. Cap the maximum size |
055388a3 DC |
378 | * at a single extent or less if the filesystem is near full. The closer the |
379 | * filesystem is to full, the smaller the maximum prealocation. | |
51446f5b CH |
380 | * |
381 | * As an exception we don't do any preallocation at all if the file is smaller | |
382 | * than the minimum preallocation and we are using the default dynamic | |
383 | * preallocation scheme, as it is likely this is the only write to the file that | |
384 | * is going to be done. | |
385 | * | |
386 | * We clean up any extra space left over when the file is closed in | |
387 | * xfs_inactive(). | |
055388a3 DC |
388 | */ |
389 | STATIC xfs_fsblock_t | |
390 | xfs_iomap_prealloc_size( | |
a1e16c26 | 391 | struct xfs_inode *ip, |
51446f5b CH |
392 | loff_t offset, |
393 | loff_t count, | |
b2b1712a | 394 | struct xfs_iext_cursor *icur) |
055388a3 | 395 | { |
51446f5b | 396 | struct xfs_mount *mp = ip->i_mount; |
656152e5 | 397 | struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); |
51446f5b | 398 | xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); |
656152e5 | 399 | struct xfs_bmbt_irec prev; |
3c58b5f8 BF |
400 | int shift = 0; |
401 | int64_t freesp; | |
76a4202a BF |
402 | xfs_fsblock_t qblocks; |
403 | int qshift = 0; | |
51446f5b CH |
404 | xfs_fsblock_t alloc_blocks = 0; |
405 | ||
406 | if (offset + count <= XFS_ISIZE(ip)) | |
407 | return 0; | |
408 | ||
409 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) && | |
410 | (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks))) | |
411 | return 0; | |
412 | ||
413 | /* | |
414 | * If an explicit allocsize is set, the file is small, or we | |
415 | * are writing behind a hole, then use the minimum prealloc: | |
416 | */ | |
417 | if ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) || | |
418 | XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) || | |
b2b1712a | 419 | !xfs_iext_peek_prev_extent(ifp, icur, &prev) || |
656152e5 | 420 | prev.br_startoff + prev.br_blockcount < offset_fsb) |
51446f5b | 421 | return mp->m_writeio_blocks; |
055388a3 | 422 | |
51446f5b CH |
423 | /* |
424 | * Determine the initial size of the preallocation. We are beyond the | |
425 | * current EOF here, but we need to take into account whether this is | |
426 | * a sparse write or an extending write when determining the | |
427 | * preallocation size. Hence we need to look up the extent that ends | |
428 | * at the current write offset and use the result to determine the | |
429 | * preallocation size. | |
430 | * | |
431 | * If the extent is a hole, then preallocation is essentially disabled. | |
432 | * Otherwise we take the size of the preceding data extent as the basis | |
433 | * for the preallocation size. If the size of the extent is greater than | |
434 | * half the maximum extent length, then use the current offset as the | |
435 | * basis. This ensures that for large files the preallocation size | |
436 | * always extends to MAXEXTLEN rather than falling short due to things | |
437 | * like stripe unit/width alignment of real extents. | |
438 | */ | |
656152e5 CH |
439 | if (prev.br_blockcount <= (MAXEXTLEN >> 1)) |
440 | alloc_blocks = prev.br_blockcount << 1; | |
51446f5b CH |
441 | else |
442 | alloc_blocks = XFS_B_TO_FSB(mp, offset); | |
3c58b5f8 BF |
443 | if (!alloc_blocks) |
444 | goto check_writeio; | |
76a4202a | 445 | qblocks = alloc_blocks; |
3c58b5f8 | 446 | |
c9bdbdc0 BF |
447 | /* |
448 | * MAXEXTLEN is not a power of two value but we round the prealloc down | |
449 | * to the nearest power of two value after throttling. To prevent the | |
450 | * round down from unconditionally reducing the maximum supported prealloc | |
451 | * size, we round up first, apply appropriate throttling, round down and | |
452 | * cap the value to MAXEXTLEN. | |
453 | */ | |
454 | alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN), | |
455 | alloc_blocks); | |
3c58b5f8 | 456 | |
0d485ada | 457 | freesp = percpu_counter_read_positive(&mp->m_fdblocks); |
3c58b5f8 BF |
458 | if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) { |
459 | shift = 2; | |
460 | if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT]) | |
461 | shift++; | |
462 | if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT]) | |
463 | shift++; | |
464 | if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT]) | |
465 | shift++; | |
466 | if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT]) | |
467 | shift++; | |
055388a3 | 468 | } |
76a4202a BF |
469 | |
470 | /* | |
f074051f BF |
471 | * Check each quota to cap the prealloc size, provide a shift value to |
472 | * throttle with and adjust amount of available space. | |
76a4202a BF |
473 | */ |
474 | if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks)) | |
f074051f BF |
475 | xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift, |
476 | &freesp); | |
76a4202a | 477 | if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks)) |
f074051f BF |
478 | xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift, |
479 | &freesp); | |
76a4202a | 480 | if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks)) |
f074051f BF |
481 | xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift, |
482 | &freesp); | |
76a4202a BF |
483 | |
484 | /* | |
485 | * The final prealloc size is set to the minimum of free space available | |
486 | * in each of the quotas and the overall filesystem. | |
487 | * | |
488 | * The shift throttle value is set to the maximum value as determined by | |
489 | * the global low free space values and per-quota low free space values. | |
490 | */ | |
491 | alloc_blocks = MIN(alloc_blocks, qblocks); | |
492 | shift = MAX(shift, qshift); | |
493 | ||
3c58b5f8 BF |
494 | if (shift) |
495 | alloc_blocks >>= shift; | |
c9bdbdc0 BF |
496 | /* |
497 | * rounddown_pow_of_two() returns an undefined result if we pass in | |
498 | * alloc_blocks = 0. | |
499 | */ | |
500 | if (alloc_blocks) | |
501 | alloc_blocks = rounddown_pow_of_two(alloc_blocks); | |
502 | if (alloc_blocks > MAXEXTLEN) | |
503 | alloc_blocks = MAXEXTLEN; | |
3c58b5f8 BF |
504 | |
505 | /* | |
506 | * If we are still trying to allocate more space than is | |
507 | * available, squash the prealloc hard. This can happen if we | |
508 | * have a large file on a small filesystem and the above | |
509 | * lowspace thresholds are smaller than MAXEXTLEN. | |
510 | */ | |
511 | while (alloc_blocks && alloc_blocks >= freesp) | |
512 | alloc_blocks >>= 4; | |
3c58b5f8 | 513 | check_writeio: |
055388a3 DC |
514 | if (alloc_blocks < mp->m_writeio_blocks) |
515 | alloc_blocks = mp->m_writeio_blocks; | |
19cb7e38 BF |
516 | trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift, |
517 | mp->m_writeio_blocks); | |
055388a3 DC |
518 | return alloc_blocks; |
519 | } | |
520 | ||
51446f5b CH |
521 | static int |
522 | xfs_file_iomap_begin_delay( | |
523 | struct inode *inode, | |
524 | loff_t offset, | |
525 | loff_t count, | |
51446f5b | 526 | struct iomap *iomap) |
1da177e4 | 527 | { |
51446f5b CH |
528 | struct xfs_inode *ip = XFS_I(inode); |
529 | struct xfs_mount *mp = ip->i_mount; | |
530 | struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); | |
531 | xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
532 | xfs_fileoff_t maxbytes_fsb = | |
533 | XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); | |
f782088c | 534 | xfs_fileoff_t end_fsb; |
51446f5b CH |
535 | int error = 0, eof = 0; |
536 | struct xfs_bmbt_irec got; | |
b2b1712a | 537 | struct xfs_iext_cursor icur; |
f782088c | 538 | xfs_fsblock_t prealloc_blocks = 0; |
51446f5b CH |
539 | |
540 | ASSERT(!XFS_IS_REALTIME_INODE(ip)); | |
541 | ASSERT(!xfs_get_extsz_hint(ip)); | |
dd9f438e | 542 | |
51446f5b | 543 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 544 | |
51446f5b CH |
545 | if (unlikely(XFS_TEST_ERROR( |
546 | (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS && | |
547 | XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE), | |
9e24cfd0 | 548 | mp, XFS_ERRTAG_BMAPIFORMAT))) { |
51446f5b CH |
549 | XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp); |
550 | error = -EFSCORRUPTED; | |
551 | goto out_unlock; | |
552 | } | |
a1e16c26 | 553 | |
51446f5b | 554 | XFS_STATS_INC(mp, xs_blk_mapw); |
055388a3 | 555 | |
51446f5b CH |
556 | if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
557 | error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK); | |
558 | if (error) | |
559 | goto out_unlock; | |
1da177e4 | 560 | } |
1da177e4 | 561 | |
b2b1712a | 562 | eof = !xfs_iext_lookup_extent(ip, ifp, offset_fsb, &icur, &got); |
51446f5b | 563 | if (!eof && got.br_startoff <= offset_fsb) { |
3ba020be CH |
564 | if (xfs_is_reflink_inode(ip)) { |
565 | bool shared; | |
566 | ||
567 | end_fsb = min(XFS_B_TO_FSB(mp, offset + count), | |
568 | maxbytes_fsb); | |
569 | xfs_trim_extent(&got, offset_fsb, end_fsb - offset_fsb); | |
570 | error = xfs_reflink_reserve_cow(ip, &got, &shared); | |
571 | if (error) | |
572 | goto out_unlock; | |
573 | } | |
574 | ||
51446f5b CH |
575 | trace_xfs_iomap_found(ip, offset, count, 0, &got); |
576 | goto done; | |
1da177e4 | 577 | } |
dd9f438e | 578 | |
51446f5b CH |
579 | error = xfs_qm_dqattach_locked(ip, 0); |
580 | if (error) | |
581 | goto out_unlock; | |
582 | ||
3ed9116e | 583 | /* |
51446f5b CH |
584 | * We cap the maximum length we map here to MAX_WRITEBACK_PAGES pages |
585 | * to keep the chunks of work done where somewhat symmetric with the | |
586 | * work writeback does. This is a completely arbitrary number pulled | |
587 | * out of thin air as a best guess for initial testing. | |
588 | * | |
589 | * Note that the values needs to be less than 32-bits wide until | |
590 | * the lower level functions are updated. | |
3ed9116e | 591 | */ |
51446f5b | 592 | count = min_t(loff_t, count, 1024 * PAGE_SIZE); |
f782088c | 593 | end_fsb = min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb); |
51446f5b CH |
594 | |
595 | if (eof) { | |
b2b1712a CH |
596 | prealloc_blocks = xfs_iomap_prealloc_size(ip, offset, count, |
597 | &icur); | |
51446f5b CH |
598 | if (prealloc_blocks) { |
599 | xfs_extlen_t align; | |
600 | xfs_off_t end_offset; | |
f782088c | 601 | xfs_fileoff_t p_end_fsb; |
3ed9116e | 602 | |
51446f5b | 603 | end_offset = XFS_WRITEIO_ALIGN(mp, offset + count - 1); |
f782088c BF |
604 | p_end_fsb = XFS_B_TO_FSBT(mp, end_offset) + |
605 | prealloc_blocks; | |
51446f5b CH |
606 | |
607 | align = xfs_eof_alignment(ip, 0); | |
608 | if (align) | |
f782088c | 609 | p_end_fsb = roundup_64(p_end_fsb, align); |
51446f5b | 610 | |
f782088c BF |
611 | p_end_fsb = min(p_end_fsb, maxbytes_fsb); |
612 | ASSERT(p_end_fsb > offset_fsb); | |
613 | prealloc_blocks = p_end_fsb - end_fsb; | |
51446f5b CH |
614 | } |
615 | } | |
616 | ||
617 | retry: | |
be51f811 | 618 | error = xfs_bmapi_reserve_delalloc(ip, XFS_DATA_FORK, offset_fsb, |
b2b1712a CH |
619 | end_fsb - offset_fsb, prealloc_blocks, &got, &icur, |
620 | eof); | |
055388a3 DC |
621 | switch (error) { |
622 | case 0: | |
51446f5b | 623 | break; |
2451337d DC |
624 | case -ENOSPC: |
625 | case -EDQUOT: | |
51446f5b | 626 | /* retry without any preallocation */ |
0b1b213f | 627 | trace_xfs_delalloc_enospc(ip, offset, count); |
f782088c BF |
628 | if (prealloc_blocks) { |
629 | prealloc_blocks = 0; | |
9aa05000 | 630 | goto retry; |
055388a3 | 631 | } |
51446f5b CH |
632 | /*FALLTHRU*/ |
633 | default: | |
634 | goto out_unlock; | |
1da177e4 LT |
635 | } |
636 | ||
f65e6fad BF |
637 | /* |
638 | * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch | |
639 | * them out if the write happens to fail. | |
640 | */ | |
641 | iomap->flags = IOMAP_F_NEW; | |
51446f5b CH |
642 | trace_xfs_iomap_alloc(ip, offset, count, 0, &got); |
643 | done: | |
644 | if (isnullstartblock(got.br_startblock)) | |
645 | got.br_startblock = DELAYSTARTBLOCK; | |
646 | ||
647 | if (!got.br_startblock) { | |
648 | error = xfs_alert_fsblock_zero(ip, &got); | |
649 | if (error) | |
650 | goto out_unlock; | |
651 | } | |
652 | ||
653 | xfs_bmbt_to_iomap(ip, iomap, &got); | |
654 | ||
655 | out_unlock: | |
656 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
657 | return error; | |
1da177e4 LT |
658 | } |
659 | ||
660 | /* | |
661 | * Pass in a delayed allocate extent, convert it to real extents; | |
662 | * return to the caller the extent we create which maps on top of | |
663 | * the originating callers request. | |
664 | * | |
665 | * Called without a lock on the inode. | |
e4143a1c DC |
666 | * |
667 | * We no longer bother to look at the incoming map - all we have to | |
668 | * guarantee is that whatever we allocate fills the required range. | |
1da177e4 | 669 | */ |
a206c817 | 670 | int |
1da177e4 LT |
671 | xfs_iomap_write_allocate( |
672 | xfs_inode_t *ip, | |
60b4984f | 673 | int whichfork, |
f403b7f4 | 674 | xfs_off_t offset, |
405f8042 | 675 | xfs_bmbt_irec_t *imap) |
1da177e4 LT |
676 | { |
677 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
678 | xfs_fileoff_t offset_fsb, last_block; |
679 | xfs_fileoff_t end_fsb, map_start_fsb; | |
680 | xfs_fsblock_t first_block; | |
2c3234d1 | 681 | struct xfs_defer_ops dfops; |
1da177e4 | 682 | xfs_filblks_t count_fsb; |
1da177e4 | 683 | xfs_trans_t *tp; |
f6106efa | 684 | int nimaps; |
1da177e4 | 685 | int error = 0; |
d2b3964a | 686 | int flags = XFS_BMAPI_DELALLOC; |
1da177e4 LT |
687 | int nres; |
688 | ||
60b4984f | 689 | if (whichfork == XFS_COW_FORK) |
5eda4300 | 690 | flags |= XFS_BMAPI_COWFORK | XFS_BMAPI_PREALLOC; |
60b4984f | 691 | |
1da177e4 LT |
692 | /* |
693 | * Make sure that the dquots are there. | |
694 | */ | |
7d095257 CH |
695 | error = xfs_qm_dqattach(ip, 0); |
696 | if (error) | |
b474c7ae | 697 | return error; |
1da177e4 | 698 | |
24e17b5f | 699 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
3070451e CH |
700 | count_fsb = imap->br_blockcount; |
701 | map_start_fsb = imap->br_startoff; | |
1da177e4 | 702 | |
ff6d6af2 | 703 | XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); |
1da177e4 LT |
704 | |
705 | while (count_fsb != 0) { | |
706 | /* | |
707 | * Set up a transaction with which to allocate the | |
708 | * backing store for the file. Do allocations in a | |
709 | * loop until we get some space in the range we are | |
710 | * interested in. The other space that might be allocated | |
711 | * is in the delayed allocation extent on which we sit | |
712 | * but before our buffer starts. | |
713 | */ | |
1da177e4 LT |
714 | nimaps = 0; |
715 | while (nimaps == 0) { | |
1da177e4 | 716 | nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); |
0af32fb4 CH |
717 | /* |
718 | * We have already reserved space for the extent and any | |
719 | * indirect blocks when creating the delalloc extent, | |
720 | * there is no need to reserve space in this transaction | |
721 | * again. | |
722 | */ | |
723 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, | |
253f4911 CH |
724 | 0, XFS_TRANS_RESERVE, &tp); |
725 | if (error) | |
b474c7ae | 726 | return error; |
253f4911 | 727 | |
1da177e4 | 728 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
ddc3415a | 729 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 | 730 | |
2c3234d1 | 731 | xfs_defer_init(&dfops, &first_block); |
1da177e4 | 732 | |
1da177e4 | 733 | /* |
e4143a1c DC |
734 | * it is possible that the extents have changed since |
735 | * we did the read call as we dropped the ilock for a | |
736 | * while. We have to be careful about truncates or hole | |
737 | * punchs here - we are not allowed to allocate | |
738 | * non-delalloc blocks here. | |
739 | * | |
740 | * The only protection against truncation is the pages | |
741 | * for the range we are being asked to convert are | |
742 | * locked and hence a truncate will block on them | |
743 | * first. | |
744 | * | |
745 | * As a result, if we go beyond the range we really | |
746 | * need and hit an delalloc extent boundary followed by | |
747 | * a hole while we have excess blocks in the map, we | |
748 | * will fill the hole incorrectly and overrun the | |
749 | * transaction reservation. | |
750 | * | |
751 | * Using a single map prevents this as we are forced to | |
752 | * check each map we look for overlap with the desired | |
753 | * range and abort as soon as we find it. Also, given | |
754 | * that we only return a single map, having one beyond | |
755 | * what we can return is probably a bit silly. | |
756 | * | |
757 | * We also need to check that we don't go beyond EOF; | |
758 | * this is a truncate optimisation as a truncate sets | |
759 | * the new file size before block on the pages we | |
760 | * currently have locked under writeback. Because they | |
761 | * are about to be tossed, we don't need to write them | |
762 | * back.... | |
1da177e4 | 763 | */ |
e4143a1c | 764 | nimaps = 1; |
ce7ae151 | 765 | end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)); |
7fb2cd4d | 766 | error = xfs_bmap_last_offset(ip, &last_block, |
7c9ef85c DC |
767 | XFS_DATA_FORK); |
768 | if (error) | |
769 | goto trans_cancel; | |
770 | ||
1da177e4 LT |
771 | last_block = XFS_FILEOFF_MAX(last_block, end_fsb); |
772 | if ((map_start_fsb + count_fsb) > last_block) { | |
773 | count_fsb = last_block - map_start_fsb; | |
774 | if (count_fsb == 0) { | |
2451337d | 775 | error = -EAGAIN; |
1da177e4 LT |
776 | goto trans_cancel; |
777 | } | |
778 | } | |
779 | ||
3070451e | 780 | /* |
3070451e CH |
781 | * From this point onwards we overwrite the imap |
782 | * pointer that the caller gave to us. | |
783 | */ | |
c0dc7828 | 784 | error = xfs_bmapi_write(tp, ip, map_start_fsb, |
60b4984f | 785 | count_fsb, flags, &first_block, |
dbd5c8c9 | 786 | nres, imap, &nimaps, |
2c3234d1 | 787 | &dfops); |
1da177e4 LT |
788 | if (error) |
789 | goto trans_cancel; | |
790 | ||
8ad7c629 | 791 | error = xfs_defer_finish(&tp, &dfops); |
1da177e4 LT |
792 | if (error) |
793 | goto trans_cancel; | |
794 | ||
70393313 | 795 | error = xfs_trans_commit(tp); |
1da177e4 LT |
796 | if (error) |
797 | goto error0; | |
798 | ||
799 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
800 | } | |
801 | ||
802 | /* | |
803 | * See if we were able to allocate an extent that | |
804 | * covers at least part of the callers request | |
805 | */ | |
3070451e | 806 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 807 | return xfs_alert_fsblock_zero(ip, imap); |
86c4d623 | 808 | |
3070451e CH |
809 | if ((offset_fsb >= imap->br_startoff) && |
810 | (offset_fsb < (imap->br_startoff + | |
811 | imap->br_blockcount))) { | |
ff6d6af2 | 812 | XFS_STATS_INC(mp, xs_xstrat_quick); |
e4143a1c | 813 | return 0; |
1da177e4 LT |
814 | } |
815 | ||
e4143a1c DC |
816 | /* |
817 | * So far we have not mapped the requested part of the | |
1da177e4 LT |
818 | * file, just surrounding data, try again. |
819 | */ | |
3070451e CH |
820 | count_fsb -= imap->br_blockcount; |
821 | map_start_fsb = imap->br_startoff + imap->br_blockcount; | |
1da177e4 LT |
822 | } |
823 | ||
824 | trans_cancel: | |
2c3234d1 | 825 | xfs_defer_cancel(&dfops); |
4906e215 | 826 | xfs_trans_cancel(tp); |
1da177e4 LT |
827 | error0: |
828 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
b474c7ae | 829 | return error; |
1da177e4 LT |
830 | } |
831 | ||
832 | int | |
833 | xfs_iomap_write_unwritten( | |
834 | xfs_inode_t *ip, | |
f403b7f4 | 835 | xfs_off_t offset, |
ee70daab EG |
836 | xfs_off_t count, |
837 | bool update_isize) | |
1da177e4 LT |
838 | { |
839 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 LT |
840 | xfs_fileoff_t offset_fsb; |
841 | xfs_filblks_t count_fsb; | |
842 | xfs_filblks_t numblks_fsb; | |
dd9f438e NS |
843 | xfs_fsblock_t firstfsb; |
844 | int nimaps; | |
845 | xfs_trans_t *tp; | |
846 | xfs_bmbt_irec_t imap; | |
2c3234d1 | 847 | struct xfs_defer_ops dfops; |
ee70daab | 848 | struct inode *inode = VFS_I(ip); |
84803fb7 | 849 | xfs_fsize_t i_size; |
dd9f438e | 850 | uint resblks; |
1da177e4 | 851 | int error; |
1da177e4 | 852 | |
0b1b213f | 853 | trace_xfs_unwritten_convert(ip, offset, count); |
1da177e4 LT |
854 | |
855 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
856 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); | |
857 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); | |
858 | ||
4ddd8bb1 LM |
859 | /* |
860 | * Reserve enough blocks in this transaction for two complete extent | |
861 | * btree splits. We may be converting the middle part of an unwritten | |
862 | * extent and in this case we will insert two new extents in the btree | |
863 | * each of which could cause a full split. | |
864 | * | |
865 | * This reservation amount will be used in the first call to | |
866 | * xfs_bmbt_split() to select an AG with enough space to satisfy the | |
867 | * rest of the operation. | |
868 | */ | |
dd9f438e | 869 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
1da177e4 | 870 | |
dd9f438e | 871 | do { |
1da177e4 | 872 | /* |
253f4911 | 873 | * Set up a transaction to convert the range of extents |
1da177e4 LT |
874 | * from unwritten to real. Do allocations in a loop until |
875 | * we have covered the range passed in. | |
80641dc6 | 876 | * |
253f4911 CH |
877 | * Note that we can't risk to recursing back into the filesystem |
878 | * here as we might be asked to write out the same inode that we | |
879 | * complete here and might deadlock on the iolock. | |
1da177e4 | 880 | */ |
253f4911 CH |
881 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, |
882 | XFS_TRANS_RESERVE | XFS_TRANS_NOFS, &tp); | |
883 | if (error) | |
b474c7ae | 884 | return error; |
1da177e4 LT |
885 | |
886 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
ddc3415a | 887 | xfs_trans_ijoin(tp, ip, 0); |
1da177e4 LT |
888 | |
889 | /* | |
890 | * Modify the unwritten extent state of the buffer. | |
891 | */ | |
2c3234d1 | 892 | xfs_defer_init(&dfops, &firstfsb); |
1da177e4 | 893 | nimaps = 1; |
c0dc7828 | 894 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
dbd5c8c9 | 895 | XFS_BMAPI_CONVERT, &firstfsb, resblks, |
2c3234d1 | 896 | &imap, &nimaps, &dfops); |
1da177e4 LT |
897 | if (error) |
898 | goto error_on_bmapi_transaction; | |
899 | ||
84803fb7 CH |
900 | /* |
901 | * Log the updated inode size as we go. We have to be careful | |
902 | * to only log it up to the actual write offset if it is | |
903 | * halfway into a block. | |
904 | */ | |
905 | i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb); | |
906 | if (i_size > offset + count) | |
907 | i_size = offset + count; | |
ee70daab EG |
908 | if (update_isize && i_size > i_size_read(inode)) |
909 | i_size_write(inode, i_size); | |
84803fb7 CH |
910 | i_size = xfs_new_eof(ip, i_size); |
911 | if (i_size) { | |
912 | ip->i_d.di_size = i_size; | |
913 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
914 | } | |
915 | ||
8ad7c629 | 916 | error = xfs_defer_finish(&tp, &dfops); |
1da177e4 LT |
917 | if (error) |
918 | goto error_on_bmapi_transaction; | |
919 | ||
70393313 | 920 | error = xfs_trans_commit(tp); |
1da177e4 LT |
921 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
922 | if (error) | |
b474c7ae | 923 | return error; |
572d95f4 | 924 | |
86c4d623 | 925 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
6d4a8ecb | 926 | return xfs_alert_fsblock_zero(ip, &imap); |
1da177e4 LT |
927 | |
928 | if ((numblks_fsb = imap.br_blockcount) == 0) { | |
929 | /* | |
930 | * The numblks_fsb value should always get | |
931 | * smaller, otherwise the loop is stuck. | |
932 | */ | |
933 | ASSERT(imap.br_blockcount); | |
934 | break; | |
935 | } | |
936 | offset_fsb += numblks_fsb; | |
937 | count_fsb -= numblks_fsb; | |
938 | } while (count_fsb > 0); | |
939 | ||
940 | return 0; | |
941 | ||
942 | error_on_bmapi_transaction: | |
2c3234d1 | 943 | xfs_defer_cancel(&dfops); |
4906e215 | 944 | xfs_trans_cancel(tp); |
1da177e4 | 945 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
b474c7ae | 946 | return error; |
1da177e4 | 947 | } |
3b3dce05 | 948 | |
6c31f495 CH |
949 | static inline bool imap_needs_alloc(struct inode *inode, |
950 | struct xfs_bmbt_irec *imap, int nimaps) | |
68a9f5e7 CH |
951 | { |
952 | return !nimaps || | |
953 | imap->br_startblock == HOLESTARTBLOCK || | |
6c31f495 | 954 | imap->br_startblock == DELAYSTARTBLOCK || |
63fbb4c1 | 955 | (IS_DAX(inode) && imap->br_state == XFS_EXT_UNWRITTEN); |
68a9f5e7 CH |
956 | } |
957 | ||
172ed391 CH |
958 | static inline bool needs_cow_for_zeroing(struct xfs_bmbt_irec *imap, int nimaps) |
959 | { | |
960 | return nimaps && | |
961 | imap->br_startblock != HOLESTARTBLOCK && | |
962 | imap->br_state != XFS_EXT_UNWRITTEN; | |
963 | } | |
964 | ||
acdda3aa CH |
965 | static inline bool need_excl_ilock(struct xfs_inode *ip, unsigned flags) |
966 | { | |
967 | /* | |
af5b5afe CH |
968 | * COW writes may allocate delalloc space or convert unwritten COW |
969 | * extents, so we need to make sure to take the lock exclusively here. | |
acdda3aa CH |
970 | */ |
971 | if (xfs_is_reflink_inode(ip) && (flags & (IOMAP_WRITE | IOMAP_ZERO))) | |
972 | return true; | |
ff3d8b9c CH |
973 | |
974 | /* | |
975 | * Extents not yet cached requires exclusive access, don't block. | |
976 | * This is an opencoded xfs_ilock_data_map_shared() to cater for the | |
977 | * non-blocking behaviour. | |
978 | */ | |
979 | if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE && | |
980 | !(ip->i_df.if_flags & XFS_IFEXTENTS)) | |
981 | return true; | |
acdda3aa CH |
982 | return false; |
983 | } | |
984 | ||
68a9f5e7 CH |
985 | static int |
986 | xfs_file_iomap_begin( | |
987 | struct inode *inode, | |
988 | loff_t offset, | |
989 | loff_t length, | |
990 | unsigned flags, | |
991 | struct iomap *iomap) | |
992 | { | |
993 | struct xfs_inode *ip = XFS_I(inode); | |
994 | struct xfs_mount *mp = ip->i_mount; | |
995 | struct xfs_bmbt_irec imap; | |
996 | xfs_fileoff_t offset_fsb, end_fsb; | |
997 | int nimaps = 1, error = 0; | |
3ba020be | 998 | bool shared = false, trimmed = false; |
66642c5c | 999 | unsigned lockmode; |
68a9f5e7 CH |
1000 | |
1001 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1002 | return -EIO; | |
1003 | ||
acdda3aa CH |
1004 | if (((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE) && |
1005 | !IS_DAX(inode) && !xfs_get_extsz_hint(ip)) { | |
2a06705c | 1006 | /* Reserve delalloc blocks for regular writeback. */ |
f91fb956 | 1007 | return xfs_file_iomap_begin_delay(inode, offset, length, iomap); |
51446f5b CH |
1008 | } |
1009 | ||
ff3d8b9c | 1010 | if (need_excl_ilock(ip, flags)) |
3ba020be | 1011 | lockmode = XFS_ILOCK_EXCL; |
ff3d8b9c CH |
1012 | else |
1013 | lockmode = XFS_ILOCK_SHARED; | |
68a9f5e7 | 1014 | |
ff3d8b9c CH |
1015 | if (flags & IOMAP_NOWAIT) { |
1016 | if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) | |
1017 | return -EAGAIN; | |
1018 | if (!xfs_ilock_nowait(ip, lockmode)) | |
1019 | return -EAGAIN; | |
1020 | } else { | |
1021 | xfs_ilock(ip, lockmode); | |
29a5d29e GR |
1022 | } |
1023 | ||
68a9f5e7 | 1024 | ASSERT(offset <= mp->m_super->s_maxbytes); |
b4d8ad7f | 1025 | if (offset > mp->m_super->s_maxbytes - length) |
68a9f5e7 CH |
1026 | length = mp->m_super->s_maxbytes - offset; |
1027 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1028 | end_fsb = XFS_B_TO_FSB(mp, offset + length); | |
1029 | ||
1030 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap, | |
db1327b1 | 1031 | &nimaps, 0); |
3ba020be CH |
1032 | if (error) |
1033 | goto out_unlock; | |
db1327b1 | 1034 | |
3c68d44a | 1035 | if (flags & IOMAP_REPORT) { |
5f9268ca CH |
1036 | /* Trim the mapping to the nearest shared extent boundary. */ |
1037 | error = xfs_reflink_trim_around_shared(ip, &imap, &shared, | |
1038 | &trimmed); | |
3ba020be CH |
1039 | if (error) |
1040 | goto out_unlock; | |
1041 | } | |
1042 | ||
172ed391 CH |
1043 | if (xfs_is_reflink_inode(ip) && |
1044 | ((flags & IOMAP_WRITE) || | |
1045 | ((flags & IOMAP_ZERO) && needs_cow_for_zeroing(&imap, nimaps)))) { | |
3c68d44a | 1046 | if (flags & IOMAP_DIRECT) { |
29a5d29e GR |
1047 | /* |
1048 | * A reflinked inode will result in CoW alloc. | |
1049 | * FIXME: It could still overwrite on unshared extents | |
1050 | * and not need allocation. | |
1051 | */ | |
1052 | if (flags & IOMAP_NOWAIT) { | |
1053 | error = -EAGAIN; | |
1054 | goto out_unlock; | |
1055 | } | |
3c68d44a CH |
1056 | /* may drop and re-acquire the ilock */ |
1057 | error = xfs_reflink_allocate_cow(ip, &imap, &shared, | |
1058 | &lockmode); | |
1059 | if (error) | |
1060 | goto out_unlock; | |
1061 | } else { | |
1062 | error = xfs_reflink_reserve_cow(ip, &imap, &shared); | |
1063 | if (error) | |
1064 | goto out_unlock; | |
1065 | } | |
3ba020be CH |
1066 | |
1067 | end_fsb = imap.br_startoff + imap.br_blockcount; | |
1068 | length = XFS_FSB_TO_B(mp, end_fsb) - offset; | |
68a9f5e7 CH |
1069 | } |
1070 | ||
6c31f495 | 1071 | if ((flags & IOMAP_WRITE) && imap_needs_alloc(inode, &imap, nimaps)) { |
29a5d29e GR |
1072 | /* |
1073 | * If nowait is set bail since we are going to make | |
1074 | * allocations. | |
1075 | */ | |
1076 | if (flags & IOMAP_NOWAIT) { | |
1077 | error = -EAGAIN; | |
1078 | goto out_unlock; | |
1079 | } | |
68a9f5e7 CH |
1080 | /* |
1081 | * We cap the maximum length we map here to MAX_WRITEBACK_PAGES | |
1082 | * pages to keep the chunks of work done where somewhat symmetric | |
1083 | * with the work writeback does. This is a completely arbitrary | |
1084 | * number pulled out of thin air as a best guess for initial | |
1085 | * testing. | |
1086 | * | |
1087 | * Note that the values needs to be less than 32-bits wide until | |
1088 | * the lower level functions are updated. | |
1089 | */ | |
1090 | length = min_t(loff_t, length, 1024 * PAGE_SIZE); | |
51446f5b CH |
1091 | /* |
1092 | * xfs_iomap_write_direct() expects the shared lock. It | |
1093 | * is unlocked on return. | |
1094 | */ | |
66642c5c CH |
1095 | if (lockmode == XFS_ILOCK_EXCL) |
1096 | xfs_ilock_demote(ip, lockmode); | |
51446f5b CH |
1097 | error = xfs_iomap_write_direct(ip, offset, length, &imap, |
1098 | nimaps); | |
68a9f5e7 CH |
1099 | if (error) |
1100 | return error; | |
1101 | ||
ecd50729 | 1102 | iomap->flags = IOMAP_F_NEW; |
68a9f5e7 | 1103 | trace_xfs_iomap_alloc(ip, offset, length, 0, &imap); |
68a9f5e7 | 1104 | } else { |
b95a2127 CH |
1105 | ASSERT(nimaps); |
1106 | ||
66642c5c | 1107 | xfs_iunlock(ip, lockmode); |
b95a2127 | 1108 | trace_xfs_iomap_found(ip, offset, length, 0, &imap); |
68a9f5e7 CH |
1109 | } |
1110 | ||
aaa422c4 DW |
1111 | if (xfs_ipincount(ip) && (ip->i_itemp->ili_fsync_fields |
1112 | & ~XFS_ILOG_TIMESTAMP)) | |
a39e596b CH |
1113 | iomap->flags |= IOMAP_F_DIRTY; |
1114 | ||
b95a2127 | 1115 | xfs_bmbt_to_iomap(ip, iomap, &imap); |
fa5d932c | 1116 | |
db1327b1 DW |
1117 | if (shared) |
1118 | iomap->flags |= IOMAP_F_SHARED; | |
68a9f5e7 | 1119 | return 0; |
3ba020be CH |
1120 | out_unlock: |
1121 | xfs_iunlock(ip, lockmode); | |
1122 | return error; | |
68a9f5e7 CH |
1123 | } |
1124 | ||
1125 | static int | |
1126 | xfs_file_iomap_end_delalloc( | |
1127 | struct xfs_inode *ip, | |
1128 | loff_t offset, | |
1129 | loff_t length, | |
f65e6fad BF |
1130 | ssize_t written, |
1131 | struct iomap *iomap) | |
68a9f5e7 CH |
1132 | { |
1133 | struct xfs_mount *mp = ip->i_mount; | |
1134 | xfs_fileoff_t start_fsb; | |
1135 | xfs_fileoff_t end_fsb; | |
1136 | int error = 0; | |
1137 | ||
f65e6fad BF |
1138 | /* |
1139 | * Behave as if the write failed if drop writes is enabled. Set the NEW | |
1140 | * flag to force delalloc cleanup. | |
1141 | */ | |
f8c47250 | 1142 | if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DROP_WRITES)) { |
f65e6fad | 1143 | iomap->flags |= IOMAP_F_NEW; |
9dbddd7b | 1144 | written = 0; |
f65e6fad | 1145 | } |
9dbddd7b | 1146 | |
fa7f138a BF |
1147 | /* |
1148 | * start_fsb refers to the first unused block after a short write. If | |
1149 | * nothing was written, round offset down to point at the first block in | |
1150 | * the range. | |
1151 | */ | |
1152 | if (unlikely(!written)) | |
1153 | start_fsb = XFS_B_TO_FSBT(mp, offset); | |
1154 | else | |
1155 | start_fsb = XFS_B_TO_FSB(mp, offset + written); | |
68a9f5e7 CH |
1156 | end_fsb = XFS_B_TO_FSB(mp, offset + length); |
1157 | ||
1158 | /* | |
f65e6fad BF |
1159 | * Trim delalloc blocks if they were allocated by this write and we |
1160 | * didn't manage to write the whole range. | |
68a9f5e7 CH |
1161 | * |
1162 | * We don't need to care about racing delalloc as we hold i_mutex | |
1163 | * across the reserve/allocate/unreserve calls. If there are delalloc | |
1164 | * blocks in the range, they are ours. | |
1165 | */ | |
f65e6fad | 1166 | if ((iomap->flags & IOMAP_F_NEW) && start_fsb < end_fsb) { |
fa7f138a BF |
1167 | truncate_pagecache_range(VFS_I(ip), XFS_FSB_TO_B(mp, start_fsb), |
1168 | XFS_FSB_TO_B(mp, end_fsb) - 1); | |
1169 | ||
68a9f5e7 CH |
1170 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1171 | error = xfs_bmap_punch_delalloc_range(ip, start_fsb, | |
1172 | end_fsb - start_fsb); | |
1173 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1174 | ||
1175 | if (error && !XFS_FORCED_SHUTDOWN(mp)) { | |
1176 | xfs_alert(mp, "%s: unable to clean up ino %lld", | |
1177 | __func__, ip->i_ino); | |
1178 | return error; | |
1179 | } | |
1180 | } | |
1181 | ||
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | static int | |
1186 | xfs_file_iomap_end( | |
1187 | struct inode *inode, | |
1188 | loff_t offset, | |
1189 | loff_t length, | |
1190 | ssize_t written, | |
1191 | unsigned flags, | |
1192 | struct iomap *iomap) | |
1193 | { | |
1194 | if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC) | |
1195 | return xfs_file_iomap_end_delalloc(XFS_I(inode), offset, | |
f65e6fad | 1196 | length, written, iomap); |
68a9f5e7 CH |
1197 | return 0; |
1198 | } | |
1199 | ||
8ff6daa1 | 1200 | const struct iomap_ops xfs_iomap_ops = { |
68a9f5e7 CH |
1201 | .iomap_begin = xfs_file_iomap_begin, |
1202 | .iomap_end = xfs_file_iomap_end, | |
1203 | }; | |
1d4795e7 CH |
1204 | |
1205 | static int | |
1206 | xfs_xattr_iomap_begin( | |
1207 | struct inode *inode, | |
1208 | loff_t offset, | |
1209 | loff_t length, | |
1210 | unsigned flags, | |
1211 | struct iomap *iomap) | |
1212 | { | |
1213 | struct xfs_inode *ip = XFS_I(inode); | |
1214 | struct xfs_mount *mp = ip->i_mount; | |
1215 | xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1216 | xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length); | |
1217 | struct xfs_bmbt_irec imap; | |
1218 | int nimaps = 1, error = 0; | |
1219 | unsigned lockmode; | |
1220 | ||
1221 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1222 | return -EIO; | |
1223 | ||
84358536 | 1224 | lockmode = xfs_ilock_attr_map_shared(ip); |
1d4795e7 CH |
1225 | |
1226 | /* if there are no attribute fork or extents, return ENOENT */ | |
84358536 | 1227 | if (!XFS_IFORK_Q(ip) || !ip->i_d.di_anextents) { |
1d4795e7 CH |
1228 | error = -ENOENT; |
1229 | goto out_unlock; | |
1230 | } | |
1231 | ||
1232 | ASSERT(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL); | |
1233 | error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap, | |
b7e0b6ff | 1234 | &nimaps, XFS_BMAPI_ATTRFORK); |
1d4795e7 CH |
1235 | out_unlock: |
1236 | xfs_iunlock(ip, lockmode); | |
1237 | ||
1238 | if (!error) { | |
1239 | ASSERT(nimaps); | |
1240 | xfs_bmbt_to_iomap(ip, iomap, &imap); | |
1241 | } | |
1242 | ||
1243 | return error; | |
1244 | } | |
1245 | ||
8ff6daa1 | 1246 | const struct iomap_ops xfs_xattr_iomap_ops = { |
1d4795e7 CH |
1247 | .iomap_begin = xfs_xattr_iomap_begin, |
1248 | }; |