Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
1da177e4 | 19 | #include "xfs_fs.h" |
a844f451 | 20 | #include "xfs_bit.h" |
1da177e4 | 21 | #include "xfs_log.h" |
a844f451 | 22 | #include "xfs_inum.h" |
1da177e4 LT |
23 | #include "xfs_trans.h" |
24 | #include "xfs_sb.h" | |
25 | #include "xfs_ag.h" | |
1da177e4 LT |
26 | #include "xfs_dir2.h" |
27 | #include "xfs_alloc.h" | |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_quota.h" | |
30 | #include "xfs_mount.h" | |
1da177e4 | 31 | #include "xfs_bmap_btree.h" |
a844f451 | 32 | #include "xfs_alloc_btree.h" |
1da177e4 | 33 | #include "xfs_ialloc_btree.h" |
1da177e4 | 34 | #include "xfs_dir2_sf.h" |
a844f451 | 35 | #include "xfs_attr_sf.h" |
1da177e4 LT |
36 | #include "xfs_dinode.h" |
37 | #include "xfs_inode.h" | |
38 | #include "xfs_bmap.h" | |
a844f451 NS |
39 | #include "xfs_btree.h" |
40 | #include "xfs_ialloc.h" | |
1da177e4 LT |
41 | #include "xfs_rtalloc.h" |
42 | #include "xfs_error.h" | |
43 | #include "xfs_itable.h" | |
44 | #include "xfs_rw.h" | |
1da177e4 LT |
45 | #include "xfs_attr.h" |
46 | #include "xfs_inode_item.h" | |
47 | #include "xfs_buf_item.h" | |
48 | #include "xfs_utils.h" | |
49 | #include "xfs_iomap.h" | |
993386c1 | 50 | #include "xfs_vnodeops.h" |
0b1b213f | 51 | #include "xfs_trace.h" |
1da177e4 LT |
52 | |
53 | #include <linux/capability.h> | |
54 | #include <linux/writeback.h> | |
55 | ||
56 | ||
1da177e4 LT |
57 | /* |
58 | * xfs_iozero | |
59 | * | |
60 | * xfs_iozero clears the specified range of buffer supplied, | |
61 | * and marks all the affected blocks as valid and modified. If | |
62 | * an affected block is not allocated, it will be allocated. If | |
63 | * an affected block is not completely overwritten, and is not | |
64 | * valid before the operation, it will be read from disk before | |
65 | * being partially zeroed. | |
66 | */ | |
67 | STATIC int | |
68 | xfs_iozero( | |
541d7d3c | 69 | struct xfs_inode *ip, /* inode */ |
1da177e4 | 70 | loff_t pos, /* offset in file */ |
68160161 | 71 | size_t count) /* size of data to zero */ |
1da177e4 | 72 | { |
1da177e4 LT |
73 | struct page *page; |
74 | struct address_space *mapping; | |
1da177e4 LT |
75 | int status; |
76 | ||
01651646 | 77 | mapping = VFS_I(ip)->i_mapping; |
1da177e4 | 78 | do { |
d79689c7 NP |
79 | unsigned offset, bytes; |
80 | void *fsdata; | |
1da177e4 LT |
81 | |
82 | offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */ | |
1da177e4 LT |
83 | bytes = PAGE_CACHE_SIZE - offset; |
84 | if (bytes > count) | |
85 | bytes = count; | |
86 | ||
d79689c7 NP |
87 | status = pagecache_write_begin(NULL, mapping, pos, bytes, |
88 | AOP_FLAG_UNINTERRUPTIBLE, | |
89 | &page, &fsdata); | |
e7ff6aed | 90 | if (status) |
d79689c7 | 91 | break; |
1da177e4 | 92 | |
eebd2aa3 | 93 | zero_user(page, offset, bytes); |
e7ff6aed | 94 | |
d79689c7 NP |
95 | status = pagecache_write_end(NULL, mapping, pos, bytes, bytes, |
96 | page, fsdata); | |
97 | WARN_ON(status <= 0); /* can't return less than zero! */ | |
98 | pos += bytes; | |
99 | count -= bytes; | |
100 | status = 0; | |
1da177e4 LT |
101 | } while (count); |
102 | ||
103 | return (-status); | |
104 | } | |
105 | ||
1da177e4 LT |
106 | ssize_t /* bytes read, or (-) error */ |
107 | xfs_read( | |
993386c1 | 108 | xfs_inode_t *ip, |
1da177e4 LT |
109 | struct kiocb *iocb, |
110 | const struct iovec *iovp, | |
111 | unsigned int segs, | |
112 | loff_t *offset, | |
993386c1 | 113 | int ioflags) |
1da177e4 LT |
114 | { |
115 | struct file *file = iocb->ki_filp; | |
116 | struct inode *inode = file->f_mapping->host; | |
993386c1 | 117 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 | 118 | size_t size = 0; |
d3cf2094 | 119 | ssize_t ret = 0; |
1da177e4 | 120 | xfs_fsize_t n; |
1da177e4 LT |
121 | unsigned long seg; |
122 | ||
1da177e4 LT |
123 | |
124 | XFS_STATS_INC(xs_read_calls); | |
125 | ||
126 | /* START copy & waste from filemap.c */ | |
127 | for (seg = 0; seg < segs; seg++) { | |
128 | const struct iovec *iv = &iovp[seg]; | |
129 | ||
130 | /* | |
131 | * If any segment has a negative length, or the cumulative | |
132 | * length ever wraps negative then return -EINVAL. | |
133 | */ | |
134 | size += iv->iov_len; | |
135 | if (unlikely((ssize_t)(size|iv->iov_len) < 0)) | |
136 | return XFS_ERROR(-EINVAL); | |
137 | } | |
138 | /* END copy & waste from filemap.c */ | |
139 | ||
140 | if (unlikely(ioflags & IO_ISDIRECT)) { | |
141 | xfs_buftarg_t *target = | |
71ddabb9 | 142 | XFS_IS_REALTIME_INODE(ip) ? |
1da177e4 | 143 | mp->m_rtdev_targp : mp->m_ddev_targp; |
ce8e922c NS |
144 | if ((*offset & target->bt_smask) || |
145 | (size & target->bt_smask)) { | |
ba87ea69 | 146 | if (*offset == ip->i_size) { |
1da177e4 LT |
147 | return (0); |
148 | } | |
149 | return -XFS_ERROR(EINVAL); | |
150 | } | |
151 | } | |
152 | ||
153 | n = XFS_MAXIOFFSET(mp) - *offset; | |
154 | if ((n <= 0) || (size == 0)) | |
155 | return 0; | |
156 | ||
157 | if (n < size) | |
158 | size = n; | |
159 | ||
a13828b1 | 160 | if (XFS_FORCED_SHUTDOWN(mp)) |
1da177e4 | 161 | return -EIO; |
1da177e4 LT |
162 | |
163 | if (unlikely(ioflags & IO_ISDIRECT)) | |
1b1dcc1b | 164 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
165 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
166 | ||
eb9df39d | 167 | if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) { |
e1a40fa9 | 168 | int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags); |
126468b1 | 169 | int iolock = XFS_IOLOCK_SHARED; |
1da177e4 | 170 | |
bc4ac74a | 171 | ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size, |
126468b1 | 172 | dmflags, &iolock); |
1da177e4 LT |
173 | if (ret) { |
174 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
721259bc LM |
175 | if (unlikely(ioflags & IO_ISDIRECT)) |
176 | mutex_unlock(&inode->i_mutex); | |
177 | return ret; | |
1da177e4 LT |
178 | } |
179 | } | |
180 | ||
edcd4bce | 181 | if (unlikely(ioflags & IO_ISDIRECT)) { |
dcf49cc5 | 182 | if (inode->i_mapping->nrpages) |
2e656092 | 183 | ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK), |
e6a4b37f | 184 | -1, FI_REMAPF_LOCKED); |
721259bc | 185 | mutex_unlock(&inode->i_mutex); |
d3cf2094 LM |
186 | if (ret) { |
187 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
188 | return ret; | |
189 | } | |
edcd4bce | 190 | } |
721259bc | 191 | |
0b1b213f | 192 | trace_xfs_file_read(ip, size, *offset, ioflags); |
543ade1f BP |
193 | |
194 | iocb->ki_pos = *offset; | |
195 | ret = generic_file_aio_read(iocb, iovp, segs, *offset); | |
1da177e4 LT |
196 | if (ret > 0) |
197 | XFS_STATS_ADD(xs_read_bytes, ret); | |
198 | ||
199 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
1da177e4 LT |
200 | return ret; |
201 | } | |
202 | ||
1b895840 NS |
203 | ssize_t |
204 | xfs_splice_read( | |
993386c1 | 205 | xfs_inode_t *ip, |
1b895840 | 206 | struct file *infilp, |
cbb7e577 | 207 | loff_t *ppos, |
3a326a2c | 208 | struct pipe_inode_info *pipe, |
1b895840 NS |
209 | size_t count, |
210 | int flags, | |
993386c1 | 211 | int ioflags) |
1b895840 | 212 | { |
1b895840 NS |
213 | xfs_mount_t *mp = ip->i_mount; |
214 | ssize_t ret; | |
1da177e4 | 215 | |
1b895840 NS |
216 | XFS_STATS_INC(xs_read_calls); |
217 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
218 | return -EIO; | |
219 | ||
220 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
221 | ||
eb9df39d | 222 | if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) { |
126468b1 | 223 | int iolock = XFS_IOLOCK_SHARED; |
1b895840 NS |
224 | int error; |
225 | ||
bc4ac74a | 226 | error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count, |
126468b1 | 227 | FILP_DELAY_FLAG(infilp), &iolock); |
1b895840 NS |
228 | if (error) { |
229 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
230 | return -error; | |
231 | } | |
232 | } | |
0b1b213f CH |
233 | |
234 | trace_xfs_file_splice_read(ip, count, *ppos, ioflags); | |
235 | ||
cbb7e577 | 236 | ret = generic_file_splice_read(infilp, ppos, pipe, count, flags); |
1da177e4 LT |
237 | if (ret > 0) |
238 | XFS_STATS_ADD(xs_read_bytes, ret); | |
239 | ||
1b895840 NS |
240 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
241 | return ret; | |
242 | } | |
243 | ||
244 | ssize_t | |
245 | xfs_splice_write( | |
993386c1 | 246 | xfs_inode_t *ip, |
3a326a2c | 247 | struct pipe_inode_info *pipe, |
1b895840 | 248 | struct file *outfilp, |
cbb7e577 | 249 | loff_t *ppos, |
1b895840 NS |
250 | size_t count, |
251 | int flags, | |
993386c1 | 252 | int ioflags) |
1b895840 | 253 | { |
1b895840 NS |
254 | xfs_mount_t *mp = ip->i_mount; |
255 | ssize_t ret; | |
0a8d17d0 | 256 | struct inode *inode = outfilp->f_mapping->host; |
ba87ea69 | 257 | xfs_fsize_t isize, new_size; |
1b895840 NS |
258 | |
259 | XFS_STATS_INC(xs_write_calls); | |
260 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
261 | return -EIO; | |
262 | ||
263 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
264 | ||
eb9df39d | 265 | if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) { |
126468b1 | 266 | int iolock = XFS_IOLOCK_EXCL; |
1b895840 NS |
267 | int error; |
268 | ||
bc4ac74a | 269 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count, |
126468b1 | 270 | FILP_DELAY_FLAG(outfilp), &iolock); |
1b895840 NS |
271 | if (error) { |
272 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
273 | return -error; | |
274 | } | |
275 | } | |
ba87ea69 LM |
276 | |
277 | new_size = *ppos + count; | |
278 | ||
279 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
280 | if (new_size > ip->i_size) | |
613d7043 | 281 | ip->i_new_size = new_size; |
ba87ea69 LM |
282 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
283 | ||
0b1b213f CH |
284 | trace_xfs_file_splice_write(ip, count, *ppos, ioflags); |
285 | ||
cbb7e577 | 286 | ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags); |
1b895840 NS |
287 | if (ret > 0) |
288 | XFS_STATS_ADD(xs_write_bytes, ret); | |
289 | ||
0a8d17d0 DC |
290 | isize = i_size_read(inode); |
291 | if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize)) | |
292 | *ppos = isize; | |
293 | ||
ba87ea69 | 294 | if (*ppos > ip->i_size) { |
0a8d17d0 | 295 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
ba87ea69 LM |
296 | if (*ppos > ip->i_size) |
297 | ip->i_size = *ppos; | |
298 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
299 | } | |
300 | ||
613d7043 | 301 | if (ip->i_new_size) { |
ba87ea69 | 302 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
613d7043 | 303 | ip->i_new_size = 0; |
ba87ea69 LM |
304 | if (ip->i_d.di_size > ip->i_size) |
305 | ip->i_d.di_size = ip->i_size; | |
0a8d17d0 DC |
306 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
307 | } | |
1b895840 | 308 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
1da177e4 LT |
309 | return ret; |
310 | } | |
311 | ||
312 | /* | |
313 | * This routine is called to handle zeroing any space in the last | |
314 | * block of the file that is beyond the EOF. We do this since the | |
315 | * size is being increased without writing anything to that block | |
316 | * and we don't want anyone to read the garbage on the disk. | |
317 | */ | |
318 | STATIC int /* error (positive) */ | |
319 | xfs_zero_last_block( | |
541d7d3c | 320 | xfs_inode_t *ip, |
68160161 LM |
321 | xfs_fsize_t offset, |
322 | xfs_fsize_t isize) | |
1da177e4 LT |
323 | { |
324 | xfs_fileoff_t last_fsb; | |
541d7d3c | 325 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 LT |
326 | int nimaps; |
327 | int zero_offset; | |
328 | int zero_len; | |
1da177e4 LT |
329 | int error = 0; |
330 | xfs_bmbt_irec_t imap; | |
1da177e4 | 331 | |
579aa9ca | 332 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 | 333 | |
24ee8088 ES |
334 | zero_offset = XFS_B_FSB_OFFSET(mp, isize); |
335 | if (zero_offset == 0) { | |
1da177e4 LT |
336 | /* |
337 | * There are no extra bytes in the last block on disk to | |
338 | * zero, so return. | |
339 | */ | |
340 | return 0; | |
341 | } | |
342 | ||
343 | last_fsb = XFS_B_TO_FSBT(mp, isize); | |
344 | nimaps = 1; | |
541d7d3c | 345 | error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap, |
3e57ecf6 | 346 | &nimaps, NULL, NULL); |
1da177e4 LT |
347 | if (error) { |
348 | return error; | |
349 | } | |
350 | ASSERT(nimaps > 0); | |
351 | /* | |
352 | * If the block underlying isize is just a hole, then there | |
353 | * is nothing to zero. | |
354 | */ | |
355 | if (imap.br_startblock == HOLESTARTBLOCK) { | |
356 | return 0; | |
357 | } | |
358 | /* | |
359 | * Zero the part of the last block beyond the EOF, and write it | |
360 | * out sync. We need to drop the ilock while we do this so we | |
361 | * don't deadlock when the buffer cache calls back to us. | |
362 | */ | |
579aa9ca | 363 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 364 | |
24ee8088 | 365 | zero_len = mp->m_sb.sb_blocksize - zero_offset; |
68160161 LM |
366 | if (isize + zero_len > offset) |
367 | zero_len = offset - isize; | |
368 | error = xfs_iozero(ip, isize, zero_len); | |
1da177e4 | 369 | |
579aa9ca | 370 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
371 | ASSERT(error >= 0); |
372 | return error; | |
373 | } | |
374 | ||
375 | /* | |
376 | * Zero any on disk space between the current EOF and the new, | |
377 | * larger EOF. This handles the normal case of zeroing the remainder | |
378 | * of the last block in the file and the unusual case of zeroing blocks | |
379 | * out beyond the size of the file. This second case only happens | |
380 | * with fixed size extents and when the system crashes before the inode | |
381 | * size was updated but after blocks were allocated. If fill is set, | |
382 | * then any holes in the range are filled and zeroed. If not, the holes | |
383 | * are left alone as holes. | |
384 | */ | |
385 | ||
386 | int /* error (positive) */ | |
387 | xfs_zero_eof( | |
541d7d3c | 388 | xfs_inode_t *ip, |
1da177e4 | 389 | xfs_off_t offset, /* starting I/O offset */ |
68160161 | 390 | xfs_fsize_t isize) /* current inode size */ |
1da177e4 | 391 | { |
613d7043 | 392 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 LT |
393 | xfs_fileoff_t start_zero_fsb; |
394 | xfs_fileoff_t end_zero_fsb; | |
1da177e4 LT |
395 | xfs_fileoff_t zero_count_fsb; |
396 | xfs_fileoff_t last_fsb; | |
68160161 LM |
397 | xfs_fileoff_t zero_off; |
398 | xfs_fsize_t zero_len; | |
1da177e4 LT |
399 | int nimaps; |
400 | int error = 0; | |
401 | xfs_bmbt_irec_t imap; | |
1da177e4 | 402 | |
579aa9ca | 403 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
24ee8088 | 404 | ASSERT(offset > isize); |
1da177e4 | 405 | |
1da177e4 LT |
406 | /* |
407 | * First handle zeroing the block on which isize resides. | |
408 | * We only zero a part of that block so it is handled specially. | |
409 | */ | |
541d7d3c | 410 | error = xfs_zero_last_block(ip, offset, isize); |
1da177e4 | 411 | if (error) { |
579aa9ca | 412 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
1da177e4 LT |
413 | return error; |
414 | } | |
415 | ||
416 | /* | |
417 | * Calculate the range between the new size and the old | |
418 | * where blocks needing to be zeroed may exist. To get the | |
419 | * block where the last byte in the file currently resides, | |
420 | * we need to subtract one from the size and truncate back | |
421 | * to a block boundary. We subtract 1 in case the size is | |
422 | * exactly on a block boundary. | |
423 | */ | |
424 | last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; | |
425 | start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); | |
426 | end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); | |
427 | ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); | |
428 | if (last_fsb == end_zero_fsb) { | |
429 | /* | |
430 | * The size was only incremented on its last block. | |
431 | * We took care of that above, so just return. | |
432 | */ | |
433 | return 0; | |
434 | } | |
435 | ||
436 | ASSERT(start_zero_fsb <= end_zero_fsb); | |
1da177e4 LT |
437 | while (start_zero_fsb <= end_zero_fsb) { |
438 | nimaps = 1; | |
439 | zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; | |
541d7d3c | 440 | error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb, |
3e57ecf6 | 441 | 0, NULL, 0, &imap, &nimaps, NULL, NULL); |
1da177e4 | 442 | if (error) { |
579aa9ca | 443 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
1da177e4 LT |
444 | return error; |
445 | } | |
446 | ASSERT(nimaps > 0); | |
447 | ||
448 | if (imap.br_state == XFS_EXT_UNWRITTEN || | |
449 | imap.br_startblock == HOLESTARTBLOCK) { | |
450 | /* | |
451 | * This loop handles initializing pages that were | |
452 | * partially initialized by the code below this | |
453 | * loop. It basically zeroes the part of the page | |
454 | * that sits on a hole and sets the page as P_HOLE | |
455 | * and calls remapf if it is a mapped file. | |
456 | */ | |
24ee8088 | 457 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
458 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
459 | continue; | |
460 | } | |
461 | ||
462 | /* | |
3d80ede4 | 463 | * There are blocks we need to zero. |
1da177e4 LT |
464 | * Drop the inode lock while we're doing the I/O. |
465 | * We'll still have the iolock to protect us. | |
466 | */ | |
579aa9ca | 467 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 468 | |
68160161 LM |
469 | zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); |
470 | zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); | |
471 | ||
472 | if ((zero_off + zero_len) > offset) | |
473 | zero_len = offset - zero_off; | |
474 | ||
475 | error = xfs_iozero(ip, zero_off, zero_len); | |
1da177e4 LT |
476 | if (error) { |
477 | goto out_lock; | |
478 | } | |
479 | ||
3d80ede4 | 480 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
481 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
482 | ||
579aa9ca | 483 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
484 | } |
485 | ||
486 | return 0; | |
487 | ||
488 | out_lock: | |
579aa9ca | 489 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
490 | ASSERT(error >= 0); |
491 | return error; | |
492 | } | |
493 | ||
494 | ssize_t /* bytes written, or (-) error */ | |
495 | xfs_write( | |
993386c1 | 496 | struct xfs_inode *xip, |
1da177e4 LT |
497 | struct kiocb *iocb, |
498 | const struct iovec *iovp, | |
499 | unsigned int nsegs, | |
500 | loff_t *offset, | |
993386c1 | 501 | int ioflags) |
1da177e4 LT |
502 | { |
503 | struct file *file = iocb->ki_filp; | |
504 | struct address_space *mapping = file->f_mapping; | |
505 | struct inode *inode = mapping->host; | |
506 | unsigned long segs = nsegs; | |
1da177e4 LT |
507 | xfs_mount_t *mp; |
508 | ssize_t ret = 0, error = 0; | |
509 | xfs_fsize_t isize, new_size; | |
1da177e4 LT |
510 | int iolock; |
511 | int eventsent = 0; | |
1da177e4 LT |
512 | size_t ocount = 0, count; |
513 | loff_t pos; | |
2a329631 | 514 | int need_i_mutex; |
1da177e4 LT |
515 | |
516 | XFS_STATS_INC(xs_write_calls); | |
517 | ||
0ceb3314 DM |
518 | error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ); |
519 | if (error) | |
520 | return error; | |
1da177e4 LT |
521 | |
522 | count = ocount; | |
523 | pos = *offset; | |
524 | ||
525 | if (count == 0) | |
526 | return 0; | |
527 | ||
613d7043 | 528 | mp = xip->i_mount; |
1da177e4 | 529 | |
b267ce99 | 530 | xfs_wait_for_freeze(mp, SB_FREEZE_WRITE); |
34327e13 | 531 | |
1da177e4 LT |
532 | if (XFS_FORCED_SHUTDOWN(mp)) |
533 | return -EIO; | |
534 | ||
1da177e4 | 535 | relock: |
2a329631 LM |
536 | if (ioflags & IO_ISDIRECT) { |
537 | iolock = XFS_IOLOCK_SHARED; | |
2a329631 LM |
538 | need_i_mutex = 0; |
539 | } else { | |
1da177e4 | 540 | iolock = XFS_IOLOCK_EXCL; |
2a329631 | 541 | need_i_mutex = 1; |
1b1dcc1b | 542 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
543 | } |
544 | ||
545 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
546 | ||
1da177e4 LT |
547 | start: |
548 | error = -generic_write_checks(file, &pos, &count, | |
549 | S_ISBLK(inode->i_mode)); | |
550 | if (error) { | |
551 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
a13828b1 | 552 | goto out_unlock_mutex; |
1da177e4 LT |
553 | } |
554 | ||
eb9df39d | 555 | if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) && |
1da177e4 | 556 | !(ioflags & IO_INVIS) && !eventsent)) { |
1da177e4 LT |
557 | int dmflags = FILP_DELAY_FLAG(file); |
558 | ||
a13828b1 | 559 | if (need_i_mutex) |
1b1dcc1b | 560 | dmflags |= DM_FLAGS_IMUX; |
1da177e4 LT |
561 | |
562 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
bc4ac74a | 563 | error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip, |
126468b1 | 564 | pos, count, dmflags, &iolock); |
1da177e4 | 565 | if (error) { |
ba87ea69 | 566 | goto out_unlock_internal; |
1da177e4 LT |
567 | } |
568 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
569 | eventsent = 1; | |
570 | ||
571 | /* | |
c41564b5 | 572 | * The iolock was dropped and reacquired in XFS_SEND_DATA |
1da177e4 LT |
573 | * so we have to recheck the size when appending. |
574 | * We will only "goto start;" once, since having sent the | |
575 | * event prevents another call to XFS_SEND_DATA, which is | |
576 | * what allows the size to change in the first place. | |
577 | */ | |
71dfd5a3 | 578 | if ((file->f_flags & O_APPEND) && pos != xip->i_size) |
1da177e4 | 579 | goto start; |
1da177e4 LT |
580 | } |
581 | ||
71dfd5a3 LM |
582 | if (ioflags & IO_ISDIRECT) { |
583 | xfs_buftarg_t *target = | |
71ddabb9 | 584 | XFS_IS_REALTIME_INODE(xip) ? |
71dfd5a3 LM |
585 | mp->m_rtdev_targp : mp->m_ddev_targp; |
586 | ||
587 | if ((pos & target->bt_smask) || (count & target->bt_smask)) { | |
588 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
589 | return XFS_ERROR(-EINVAL); | |
590 | } | |
591 | ||
dcf49cc5 | 592 | if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) { |
71dfd5a3 LM |
593 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); |
594 | iolock = XFS_IOLOCK_EXCL; | |
71dfd5a3 LM |
595 | need_i_mutex = 1; |
596 | mutex_lock(&inode->i_mutex); | |
597 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
1da177e4 LT |
598 | goto start; |
599 | } | |
600 | } | |
601 | ||
71dfd5a3 LM |
602 | new_size = pos + count; |
603 | if (new_size > xip->i_size) | |
613d7043 | 604 | xip->i_new_size = new_size; |
71dfd5a3 | 605 | |
2234d54d | 606 | if (likely(!(ioflags & IO_INVIS))) |
f9581b14 | 607 | file_update_time(file); |
1da177e4 LT |
608 | |
609 | /* | |
610 | * If the offset is beyond the size of the file, we have a couple | |
611 | * of things to do. First, if there is already space allocated | |
612 | * we need to either create holes or zero the disk or ... | |
613 | * | |
614 | * If there is a page where the previous size lands, we need | |
615 | * to zero it out up to the new size. | |
616 | */ | |
617 | ||
ba87ea69 | 618 | if (pos > xip->i_size) { |
541d7d3c | 619 | error = xfs_zero_eof(xip, pos, xip->i_size); |
1da177e4 | 620 | if (error) { |
ba87ea69 LM |
621 | xfs_iunlock(xip, XFS_ILOCK_EXCL); |
622 | goto out_unlock_internal; | |
1da177e4 LT |
623 | } |
624 | } | |
625 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
626 | ||
627 | /* | |
628 | * If we're writing the file then make sure to clear the | |
629 | * setuid and setgid bits if the process is not being run | |
630 | * by root. This keeps people from modifying setuid and | |
631 | * setgid binaries. | |
632 | */ | |
633 | ||
634 | if (((xip->i_d.di_mode & S_ISUID) || | |
635 | ((xip->i_d.di_mode & (S_ISGID | S_IXGRP)) == | |
636 | (S_ISGID | S_IXGRP))) && | |
637 | !capable(CAP_FSETID)) { | |
638 | error = xfs_write_clear_setuid(xip); | |
639 | if (likely(!error)) | |
2f1936b8 | 640 | error = -file_remove_suid(file); |
1da177e4 | 641 | if (unlikely(error)) { |
ba87ea69 | 642 | goto out_unlock_internal; |
1da177e4 LT |
643 | } |
644 | } | |
645 | ||
1da177e4 LT |
646 | /* We can write back this queue in page reclaim */ |
647 | current->backing_dev_info = mapping->backing_dev_info; | |
648 | ||
649 | if ((ioflags & IO_ISDIRECT)) { | |
dcf49cc5 | 650 | if (mapping->nrpages) { |
2a329631 | 651 | WARN_ON(need_i_mutex == 0); |
739bfb2a | 652 | error = xfs_flushinval_pages(xip, |
e6a4b37f | 653 | (pos & PAGE_CACHE_MASK), |
1da177e4 | 654 | -1, FI_REMAPF_LOCKED); |
d3cf2094 LM |
655 | if (error) |
656 | goto out_unlock_internal; | |
1da177e4 LT |
657 | } |
658 | ||
a13828b1 | 659 | if (need_i_mutex) { |
1da177e4 | 660 | /* demote the lock now the cached pages are gone */ |
541d7d3c | 661 | xfs_ilock_demote(xip, XFS_IOLOCK_EXCL); |
1b1dcc1b | 662 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
663 | |
664 | iolock = XFS_IOLOCK_SHARED; | |
a13828b1 | 665 | need_i_mutex = 0; |
1da177e4 LT |
666 | } |
667 | ||
0b1b213f | 668 | trace_xfs_file_direct_write(xip, count, *offset, ioflags); |
1da177e4 LT |
669 | ret = generic_file_direct_write(iocb, iovp, |
670 | &segs, pos, offset, count, ocount); | |
671 | ||
672 | /* | |
673 | * direct-io write to a hole: fall through to buffered I/O | |
674 | * for completing the rest of the request. | |
675 | */ | |
676 | if (ret >= 0 && ret != count) { | |
677 | XFS_STATS_ADD(xs_write_bytes, ret); | |
678 | ||
679 | pos += ret; | |
680 | count -= ret; | |
681 | ||
1da177e4 LT |
682 | ioflags &= ~IO_ISDIRECT; |
683 | xfs_iunlock(xip, iolock); | |
684 | goto relock; | |
685 | } | |
686 | } else { | |
5825294e DC |
687 | int enospc = 0; |
688 | ssize_t ret2 = 0; | |
689 | ||
690 | write_retry: | |
0b1b213f | 691 | trace_xfs_file_buffered_write(xip, count, *offset, ioflags); |
5825294e | 692 | ret2 = generic_file_buffered_write(iocb, iovp, segs, |
1da177e4 | 693 | pos, offset, count, ret); |
5825294e DC |
694 | /* |
695 | * if we just got an ENOSPC, flush the inode now we | |
696 | * aren't holding any page locks and retry *once* | |
697 | */ | |
698 | if (ret2 == -ENOSPC && !enospc) { | |
699 | error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE); | |
700 | if (error) | |
701 | goto out_unlock_internal; | |
702 | enospc = 1; | |
703 | goto write_retry; | |
704 | } | |
705 | ret = ret2; | |
1da177e4 LT |
706 | } |
707 | ||
708 | current->backing_dev_info = NULL; | |
709 | ||
25051158 LM |
710 | isize = i_size_read(inode); |
711 | if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize)) | |
712 | *offset = isize; | |
713 | ||
714 | if (*offset > xip->i_size) { | |
715 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
716 | if (*offset > xip->i_size) | |
717 | xip->i_size = *offset; | |
718 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
719 | } | |
720 | ||
eb9df39d CH |
721 | if (ret == -ENOSPC && |
722 | DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) { | |
126468b1 | 723 | xfs_iunlock(xip, iolock); |
a13828b1 | 724 | if (need_i_mutex) |
1b1dcc1b | 725 | mutex_unlock(&inode->i_mutex); |
bc4ac74a CH |
726 | error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip, |
727 | DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL, | |
1da177e4 | 728 | 0, 0, 0); /* Delay flag intentionally unused */ |
a13828b1 | 729 | if (need_i_mutex) |
1b1dcc1b | 730 | mutex_lock(&inode->i_mutex); |
126468b1 | 731 | xfs_ilock(xip, iolock); |
ba87ea69 LM |
732 | if (error) |
733 | goto out_unlock_internal; | |
25051158 | 734 | goto start; |
1da177e4 LT |
735 | } |
736 | ||
737 | error = -ret; | |
738 | if (ret <= 0) | |
739 | goto out_unlock_internal; | |
740 | ||
741 | XFS_STATS_ADD(xs_write_bytes, ret); | |
742 | ||
743 | /* Handle various SYNC-type writes */ | |
6b2f3d1f | 744 | if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) { |
13e6d5cd | 745 | loff_t end = pos + ret - 1; |
5903c495 | 746 | int error2; |
126468b1 CH |
747 | |
748 | xfs_iunlock(xip, iolock); | |
a13828b1 | 749 | if (need_i_mutex) |
1b1dcc1b | 750 | mutex_unlock(&inode->i_mutex); |
13e6d5cd CH |
751 | |
752 | error2 = filemap_write_and_wait_range(mapping, pos, end); | |
1da177e4 | 753 | if (!error) |
5903c495 | 754 | error = error2; |
ba87ea69 LM |
755 | if (need_i_mutex) |
756 | mutex_lock(&inode->i_mutex); | |
126468b1 | 757 | xfs_ilock(xip, iolock); |
13e6d5cd CH |
758 | |
759 | error2 = xfs_fsync(xip); | |
5903c495 LM |
760 | if (!error) |
761 | error = error2; | |
1da177e4 LT |
762 | } |
763 | ||
764 | out_unlock_internal: | |
613d7043 | 765 | if (xip->i_new_size) { |
ba87ea69 | 766 | xfs_ilock(xip, XFS_ILOCK_EXCL); |
613d7043 | 767 | xip->i_new_size = 0; |
ba87ea69 LM |
768 | /* |
769 | * If this was a direct or synchronous I/O that failed (such | |
770 | * as ENOSPC) then part of the I/O may have been written to | |
771 | * disk before the error occured. In this case the on-disk | |
772 | * file size may have been adjusted beyond the in-memory file | |
773 | * size and now needs to be truncated back. | |
774 | */ | |
775 | if (xip->i_d.di_size > xip->i_size) | |
776 | xip->i_d.di_size = xip->i_size; | |
777 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
778 | } | |
126468b1 | 779 | xfs_iunlock(xip, iolock); |
a13828b1 NS |
780 | out_unlock_mutex: |
781 | if (need_i_mutex) | |
1b1dcc1b | 782 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
783 | return -error; |
784 | } | |
785 | ||
786 | /* | |
787 | * All xfs metadata buffers except log state machine buffers | |
788 | * get this attached as their b_bdstrat callback function. | |
789 | * This is so that we can catch a buffer | |
790 | * after prematurely unpinning it to forcibly shutdown the filesystem. | |
791 | */ | |
792 | int | |
793 | xfs_bdstrat_cb(struct xfs_buf *bp) | |
794 | { | |
15ac08a8 | 795 | if (XFS_FORCED_SHUTDOWN(bp->b_mount)) { |
0b1b213f | 796 | trace_xfs_bdstrat_shut(bp, _RET_IP_); |
1da177e4 LT |
797 | /* |
798 | * Metadata write that didn't get logged but | |
799 | * written delayed anyway. These aren't associated | |
800 | * with a transaction, and can be ignored. | |
801 | */ | |
802 | if (XFS_BUF_IODONE_FUNC(bp) == NULL && | |
803 | (XFS_BUF_ISREAD(bp)) == 0) | |
804 | return (xfs_bioerror_relse(bp)); | |
805 | else | |
806 | return (xfs_bioerror(bp)); | |
807 | } | |
15ac08a8 CH |
808 | |
809 | xfs_buf_iorequest(bp); | |
810 | return 0; | |
1da177e4 LT |
811 | } |
812 | ||
1da177e4 | 813 | /* |
d64e31a2 DC |
814 | * Wrapper around bdstrat so that we can stop data from going to disk in case |
815 | * we are shutting down the filesystem. Typically user data goes thru this | |
816 | * path; one of the exceptions is the superblock. | |
1da177e4 | 817 | */ |
d64e31a2 | 818 | void |
1da177e4 LT |
819 | xfsbdstrat( |
820 | struct xfs_mount *mp, | |
821 | struct xfs_buf *bp) | |
822 | { | |
823 | ASSERT(mp); | |
d4055947 | 824 | if (!XFS_FORCED_SHUTDOWN(mp)) { |
ce8e922c | 825 | xfs_buf_iorequest(bp); |
d4055947 DC |
826 | return; |
827 | } | |
1da177e4 | 828 | |
0b1b213f | 829 | trace_xfs_bdstrat_shut(bp, _RET_IP_); |
d64e31a2 | 830 | xfs_bioerror_relse(bp); |
1da177e4 LT |
831 | } |
832 | ||
833 | /* | |
834 | * If the underlying (data/log/rt) device is readonly, there are some | |
835 | * operations that cannot proceed. | |
836 | */ | |
837 | int | |
838 | xfs_dev_is_read_only( | |
839 | xfs_mount_t *mp, | |
840 | char *message) | |
841 | { | |
842 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || | |
843 | xfs_readonly_buftarg(mp->m_logdev_targp) || | |
844 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { | |
845 | cmn_err(CE_NOTE, | |
846 | "XFS: %s required on read-only device.", message); | |
847 | cmn_err(CE_NOTE, | |
848 | "XFS: write access unavailable, cannot proceed."); | |
849 | return EROFS; | |
850 | } | |
851 | return 0; | |
852 | } |