Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/nfs/file.c | |
4 | * | |
5 | * Copyright (C) 1992 Rick Sladkey | |
6 | * | |
7 | * Changes Copyright (C) 1994 by Florian La Roche | |
8 | * - Do not copy data too often around in the kernel. | |
9 | * - In nfs_file_read the return value of kmalloc wasn't checked. | |
10 | * - Put in a better version of read look-ahead buffering. Original idea | |
11 | * and implementation by Wai S Kok elekokws@ee.nus.sg. | |
12 | * | |
13 | * Expire cache on write to a file by Wai S Kok (Oct 1994). | |
14 | * | |
15 | * Total rewrite of read side for new NFS buffer cache.. Linus. | |
16 | * | |
17 | * nfs regular file handling functions | |
18 | */ | |
19 | ||
ddda8e0a | 20 | #include <linux/module.h> |
1da177e4 LT |
21 | #include <linux/time.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/stat.h> | |
26 | #include <linux/nfs_fs.h> | |
27 | #include <linux/nfs_mount.h> | |
28 | #include <linux/mm.h> | |
1da177e4 | 29 | #include <linux/pagemap.h> |
5a0e3ad6 | 30 | #include <linux/gfp.h> |
b608b283 | 31 | #include <linux/swap.h> |
1da177e4 | 32 | |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
5970e15d | 34 | #include <linux/filelock.h> |
1da177e4 LT |
35 | |
36 | #include "delegation.h" | |
94387fb1 | 37 | #include "internal.h" |
91d5b470 | 38 | #include "iostat.h" |
545db45f | 39 | #include "fscache.h" |
612aa983 | 40 | #include "pnfs.h" |
1da177e4 | 41 | |
f4ce1299 TM |
42 | #include "nfstrace.h" |
43 | ||
1da177e4 LT |
44 | #define NFSDBG_FACILITY NFSDBG_FILE |
45 | ||
f0f37e2f | 46 | static const struct vm_operations_struct nfs_file_vm_ops; |
94387fb1 | 47 | |
ce4ef7c0 | 48 | int nfs_check_flags(int flags) |
1da177e4 LT |
49 | { |
50 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
51 | return -EINVAL; | |
52 | ||
53 | return 0; | |
54 | } | |
89d77c8f | 55 | EXPORT_SYMBOL_GPL(nfs_check_flags); |
1da177e4 LT |
56 | |
57 | /* | |
58 | * Open file | |
59 | */ | |
60 | static int | |
61 | nfs_file_open(struct inode *inode, struct file *filp) | |
62 | { | |
1da177e4 LT |
63 | int res; |
64 | ||
6de1472f | 65 | dprintk("NFS: open file(%pD2)\n", filp); |
cc0dd2d1 | 66 | |
c2459dc4 | 67 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 LT |
68 | res = nfs_check_flags(filp->f_flags); |
69 | if (res) | |
70 | return res; | |
71 | ||
46cb650c | 72 | res = nfs_open(inode, filp); |
a2ad63da N |
73 | if (res == 0) |
74 | filp->f_mode |= FMODE_CAN_ODIRECT; | |
1da177e4 LT |
75 | return res; |
76 | } | |
77 | ||
ce4ef7c0 | 78 | int |
1da177e4 LT |
79 | nfs_file_release(struct inode *inode, struct file *filp) |
80 | { | |
6de1472f | 81 | dprintk("NFS: release(%pD2)\n", filp); |
6da24bc9 | 82 | |
91d5b470 | 83 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
aff8d8dc | 84 | nfs_file_clear_open_context(filp); |
a6b5a28e | 85 | nfs_fscache_release_file(inode, filp); |
aff8d8dc | 86 | return 0; |
1da177e4 | 87 | } |
89d77c8f | 88 | EXPORT_SYMBOL_GPL(nfs_file_release); |
1da177e4 | 89 | |
980802e3 | 90 | /** |
37eaeed1 | 91 | * nfs_revalidate_file_size - Revalidate the file size |
302fad7b TM |
92 | * @inode: pointer to inode struct |
93 | * @filp: pointer to struct file | |
980802e3 TM |
94 | * |
95 | * Revalidates the file length. This is basically a wrapper around | |
96 | * nfs_revalidate_inode() that takes into account the fact that we may | |
97 | * have cached writes (in which case we don't care about the server's | |
98 | * idea of what the file length is), or O_DIRECT (in which case we | |
99 | * shouldn't trust the cache). | |
100 | */ | |
101 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
102 | { | |
103 | struct nfs_server *server = NFS_SERVER(inode); | |
d7cf8dd0 | 104 | |
980802e3 TM |
105 | if (filp->f_flags & O_DIRECT) |
106 | goto force_reval; | |
13c0b082 | 107 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_SIZE)) |
d7cf8dd0 | 108 | goto force_reval; |
d7cf8dd0 | 109 | return 0; |
980802e3 TM |
110 | force_reval: |
111 | return __nfs_revalidate_inode(server, inode); | |
112 | } | |
113 | ||
965c8e59 | 114 | loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence) |
980802e3 | 115 | { |
6de1472f AV |
116 | dprintk("NFS: llseek file(%pD2, %lld, %d)\n", |
117 | filp, offset, whence); | |
b84e06c5 | 118 | |
06222e49 | 119 | /* |
965c8e59 | 120 | * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate |
06222e49 JB |
121 | * the cached file length |
122 | */ | |
965c8e59 | 123 | if (whence != SEEK_SET && whence != SEEK_CUR) { |
980802e3 | 124 | struct inode *inode = filp->f_mapping->host; |
d5e66348 | 125 | |
980802e3 TM |
126 | int retval = nfs_revalidate_file_size(inode, filp); |
127 | if (retval < 0) | |
128 | return (loff_t)retval; | |
79835a71 | 129 | } |
d5e66348 | 130 | |
965c8e59 | 131 | return generic_file_llseek(filp, offset, whence); |
980802e3 | 132 | } |
89d77c8f | 133 | EXPORT_SYMBOL_GPL(nfs_file_llseek); |
980802e3 | 134 | |
1da177e4 LT |
135 | /* |
136 | * Flush all dirty pages, and check for write errors. | |
1da177e4 | 137 | */ |
5445b1fb | 138 | static int |
75e1fcc0 | 139 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 140 | { |
6de1472f | 141 | struct inode *inode = file_inode(file); |
67dd23f9 | 142 | errseq_t since; |
1da177e4 | 143 | |
6de1472f | 144 | dprintk("NFS: flush(%pD2)\n", file); |
1da177e4 | 145 | |
c2459dc4 | 146 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
1da177e4 LT |
147 | if ((file->f_mode & FMODE_WRITE) == 0) |
148 | return 0; | |
7b159fc1 | 149 | |
7fe5c398 | 150 | /* Flush writes to the server and return any errors */ |
67dd23f9 SM |
151 | since = filemap_sample_wb_err(file->f_mapping); |
152 | nfs_wb_all(inode); | |
153 | return filemap_check_wb_err(file->f_mapping, since); | |
1da177e4 LT |
154 | } |
155 | ||
ce4ef7c0 | 156 | ssize_t |
3aa2d199 | 157 | nfs_file_read(struct kiocb *iocb, struct iov_iter *to) |
1da177e4 | 158 | { |
6de1472f | 159 | struct inode *inode = file_inode(iocb->ki_filp); |
1da177e4 LT |
160 | ssize_t result; |
161 | ||
2ba48ce5 | 162 | if (iocb->ki_flags & IOCB_DIRECT) |
64158668 | 163 | return nfs_file_direct_read(iocb, to, false); |
1da177e4 | 164 | |
619d30b4 | 165 | dprintk("NFS: read(%pD2, %zu@%lu)\n", |
6de1472f | 166 | iocb->ki_filp, |
3aa2d199 | 167 | iov_iter_count(to), (unsigned long) iocb->ki_pos); |
1da177e4 | 168 | |
a5864c99 TM |
169 | nfs_start_io_read(inode); |
170 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); | |
4184dcf2 | 171 | if (!result) { |
3aa2d199 | 172 | result = generic_file_read_iter(iocb, to); |
4184dcf2 CL |
173 | if (result > 0) |
174 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result); | |
175 | } | |
a5864c99 | 176 | nfs_end_io_read(inode); |
1da177e4 LT |
177 | return result; |
178 | } | |
89d77c8f | 179 | EXPORT_SYMBOL_GPL(nfs_file_read); |
1da177e4 | 180 | |
ce4ef7c0 | 181 | int |
1da177e4 LT |
182 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) |
183 | { | |
6de1472f | 184 | struct inode *inode = file_inode(file); |
1da177e4 LT |
185 | int status; |
186 | ||
6de1472f | 187 | dprintk("NFS: mmap(%pD2)\n", file); |
1da177e4 | 188 | |
e1ebfd33 TM |
189 | /* Note: generic_file_mmap() returns ENOSYS on nommu systems |
190 | * so we call that before revalidating the mapping | |
191 | */ | |
192 | status = generic_file_mmap(file, vma); | |
94387fb1 TM |
193 | if (!status) { |
194 | vma->vm_ops = &nfs_file_vm_ops; | |
e1ebfd33 | 195 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 | 196 | } |
1da177e4 LT |
197 | return status; |
198 | } | |
89d77c8f | 199 | EXPORT_SYMBOL_GPL(nfs_file_mmap); |
1da177e4 LT |
200 | |
201 | /* | |
202 | * Flush any dirty pages for this process, and check for write errors. | |
203 | * The return status from this call provides a reliable indication of | |
204 | * whether any write errors occurred for this process. | |
205 | */ | |
4ff79bc7 | 206 | static int |
bf4b4905 | 207 | nfs_file_fsync_commit(struct file *file, int datasync) |
1da177e4 | 208 | { |
6de1472f | 209 | struct inode *inode = file_inode(file); |
9641d9bc | 210 | int ret, ret2; |
af7fa165 | 211 | |
6de1472f | 212 | dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync); |
1da177e4 | 213 | |
91d5b470 | 214 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
2197e9b0 | 215 | ret = nfs_commit_inode(inode, FLUSH_SYNC); |
9641d9bc TM |
216 | ret2 = file_check_and_advance_wb_err(file); |
217 | if (ret2 < 0) | |
218 | return ret2; | |
219 | return ret; | |
a5c58892 BS |
220 | } |
221 | ||
4ff79bc7 | 222 | int |
a5c58892 BS |
223 | nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
224 | { | |
496ad9aa | 225 | struct inode *inode = file_inode(file); |
67f4b5dc TM |
226 | struct nfs_inode *nfsi = NFS_I(inode); |
227 | long save_nredirtied = atomic_long_read(&nfsi->redirtied_pages); | |
228 | long nredirtied; | |
2197e9b0 | 229 | int ret; |
a5c58892 | 230 | |
f4ce1299 TM |
231 | trace_nfs_fsync_enter(inode); |
232 | ||
2197e9b0 | 233 | for (;;) { |
6fbda89b | 234 | ret = file_write_and_wait_range(file, start, end); |
05990d1b TM |
235 | if (ret != 0) |
236 | break; | |
bf4b4905 | 237 | ret = nfs_file_fsync_commit(file, datasync); |
2197e9b0 TM |
238 | if (ret != 0) |
239 | break; | |
240 | ret = pnfs_sync_inode(inode, !!datasync); | |
241 | if (ret != 0) | |
242 | break; | |
67f4b5dc TM |
243 | nredirtied = atomic_long_read(&nfsi->redirtied_pages); |
244 | if (nredirtied == save_nredirtied) | |
2197e9b0 | 245 | break; |
67f4b5dc | 246 | save_nredirtied = nredirtied; |
2197e9b0 | 247 | } |
05990d1b | 248 | |
f4ce1299 | 249 | trace_nfs_fsync_exit(inode, ret); |
af7fa165 | 250 | return ret; |
1da177e4 | 251 | } |
4ff79bc7 | 252 | EXPORT_SYMBOL_GPL(nfs_file_fsync); |
1da177e4 | 253 | |
38c73044 PS |
254 | /* |
255 | * Decide whether a read/modify/write cycle may be more efficient | |
256 | * then a modify/write/read cycle when writing to a page in the | |
257 | * page cache. | |
258 | * | |
2cde04e9 KI |
259 | * Some pNFS layout drivers can only read/write at a certain block |
260 | * granularity like all block devices and therefore we must perform | |
261 | * read/modify/write whenever a page hasn't read yet and the data | |
262 | * to be written there is not aligned to a block boundary and/or | |
263 | * smaller than the block size. | |
264 | * | |
38c73044 PS |
265 | * The modify/write/read cycle may occur if a page is read before |
266 | * being completely filled by the writer. In this situation, the | |
267 | * page must be completely written to stable storage on the server | |
268 | * before it can be refilled by reading in the page from the server. | |
269 | * This can lead to expensive, small, FILE_SYNC mode writes being | |
270 | * done. | |
271 | * | |
272 | * It may be more efficient to read the page first if the file is | |
273 | * open for reading in addition to writing, the page is not marked | |
274 | * as Uptodate, it is not dirty or waiting to be committed, | |
275 | * indicating that it was previously allocated and then modified, | |
276 | * that there were valid bytes of data in that range of the file, | |
277 | * and that the new data won't completely replace the old data in | |
278 | * that range of the file. | |
279 | */ | |
54d99381 TM |
280 | static bool nfs_folio_is_full_write(struct folio *folio, loff_t pos, |
281 | unsigned int len) | |
38c73044 | 282 | { |
54d99381 TM |
283 | unsigned int pglen = nfs_folio_length(folio); |
284 | unsigned int offset = offset_in_folio(folio, pos); | |
38c73044 PS |
285 | unsigned int end = offset + len; |
286 | ||
2cde04e9 KI |
287 | return !pglen || (end >= pglen && !offset); |
288 | } | |
612aa983 | 289 | |
54d99381 TM |
290 | static bool nfs_want_read_modify_write(struct file *file, struct folio *folio, |
291 | loff_t pos, unsigned int len) | |
2cde04e9 KI |
292 | { |
293 | /* | |
294 | * Up-to-date pages, those with ongoing or full-page write | |
295 | * don't need read/modify/write | |
296 | */ | |
54d99381 TM |
297 | if (folio_test_uptodate(folio) || folio_test_private(folio) || |
298 | nfs_folio_is_full_write(folio, pos, len)) | |
2cde04e9 KI |
299 | return false; |
300 | ||
54d99381 | 301 | if (pnfs_ld_read_whole_page(file_inode(file))) |
2cde04e9 KI |
302 | return true; |
303 | /* Open for reading too? */ | |
304 | if (file->f_mode & FMODE_READ) | |
305 | return true; | |
306 | return false; | |
38c73044 PS |
307 | } |
308 | ||
1da177e4 | 309 | /* |
4899f9c8 NP |
310 | * This does the "real" work of the write. We must allocate and lock the |
311 | * page to be sent back to the generic routine, which then copies the | |
312 | * data from user space. | |
1da177e4 LT |
313 | * |
314 | * If the writer ends up delaying the write, the writer needs to | |
315 | * increment the page use counts until he is done with the page. | |
316 | */ | |
4899f9c8 | 317 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
54d99381 TM |
318 | loff_t pos, unsigned len, struct page **pagep, |
319 | void **fsdata) | |
1da177e4 | 320 | { |
0c493b5c | 321 | struct folio *folio; |
38c73044 | 322 | int once_thru = 0; |
54d99381 | 323 | int ret; |
4899f9c8 | 324 | |
1e8968c5 | 325 | dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n", |
6de1472f | 326 | file, mapping->host->i_ino, len, (long long) pos); |
b7eaefaa | 327 | |
38c73044 | 328 | start: |
e999a5c5 MW |
329 | folio = __filemap_get_folio(mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN, |
330 | mapping_gfp_mask(mapping)); | |
66dabbb6 CH |
331 | if (IS_ERR(folio)) |
332 | return PTR_ERR(folio); | |
54d99381 | 333 | *pagep = &folio->page; |
4899f9c8 | 334 | |
0c493b5c | 335 | ret = nfs_flush_incompatible(file, folio); |
4899f9c8 | 336 | if (ret) { |
54d99381 TM |
337 | folio_unlock(folio); |
338 | folio_put(folio); | |
38c73044 | 339 | } else if (!once_thru && |
54d99381 | 340 | nfs_want_read_modify_write(file, folio, pos, len)) { |
38c73044 | 341 | once_thru = 1; |
0c493b5c | 342 | ret = nfs_read_folio(file, folio); |
54d99381 | 343 | folio_put(folio); |
38c73044 PS |
344 | if (!ret) |
345 | goto start; | |
4899f9c8 NP |
346 | } |
347 | return ret; | |
1da177e4 LT |
348 | } |
349 | ||
4899f9c8 | 350 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
54d99381 TM |
351 | loff_t pos, unsigned len, unsigned copied, |
352 | struct page *page, void *fsdata) | |
1da177e4 | 353 | { |
dc24826b | 354 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
0c493b5c | 355 | struct folio *folio = page_folio(page); |
54d99381 | 356 | unsigned offset = offset_in_folio(folio, pos); |
4899f9c8 | 357 | int status; |
1da177e4 | 358 | |
1e8968c5 | 359 | dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n", |
6de1472f | 360 | file, mapping->host->i_ino, len, (long long) pos); |
b7eaefaa | 361 | |
efc91ed0 TM |
362 | /* |
363 | * Zero any uninitialised parts of the page, and then mark the page | |
364 | * as up to date if it turns out that we're extending the file. | |
365 | */ | |
54d99381 TM |
366 | if (!folio_test_uptodate(folio)) { |
367 | size_t fsize = folio_size(folio); | |
368 | unsigned pglen = nfs_folio_length(folio); | |
c0cf3ef5 | 369 | unsigned end = offset + copied; |
efc91ed0 TM |
370 | |
371 | if (pglen == 0) { | |
54d99381 TM |
372 | folio_zero_segments(folio, 0, offset, end, fsize); |
373 | folio_mark_uptodate(folio); | |
efc91ed0 | 374 | } else if (end >= pglen) { |
54d99381 | 375 | folio_zero_segment(folio, end, fsize); |
efc91ed0 | 376 | if (offset == 0) |
54d99381 | 377 | folio_mark_uptodate(folio); |
efc91ed0 | 378 | } else |
54d99381 | 379 | folio_zero_segment(folio, pglen, fsize); |
efc91ed0 TM |
380 | } |
381 | ||
0c493b5c | 382 | status = nfs_update_folio(file, folio, offset, copied); |
4899f9c8 | 383 | |
54d99381 TM |
384 | folio_unlock(folio); |
385 | folio_put(folio); | |
4899f9c8 | 386 | |
3d509e54 CL |
387 | if (status < 0) |
388 | return status; | |
2701d086 | 389 | NFS_I(mapping->host)->write_io += copied; |
dc24826b | 390 | |
d95b2665 TM |
391 | if (nfs_ctx_key_to_expire(ctx, mapping->host)) |
392 | nfs_wb_all(mapping->host); | |
dc24826b | 393 | |
3d509e54 | 394 | return copied; |
1da177e4 LT |
395 | } |
396 | ||
6b9b3514 DH |
397 | /* |
398 | * Partially or wholly invalidate a page | |
399 | * - Release the private state associated with a page if undergoing complete | |
400 | * page invalidation | |
545db45f | 401 | * - Called if either PG_private or PG_fscache is set on the page |
6b9b3514 DH |
402 | * - Caller holds page lock |
403 | */ | |
6d740c76 MWO |
404 | static void nfs_invalidate_folio(struct folio *folio, size_t offset, |
405 | size_t length) | |
cd52ed35 | 406 | { |
eb5654b3 | 407 | struct inode *inode = folio_file_mapping(folio)->host; |
6d740c76 MWO |
408 | dfprintk(PAGECACHE, "NFS: invalidate_folio(%lu, %zu, %zu)\n", |
409 | folio->index, offset, length); | |
b7eaefaa | 410 | |
6d740c76 | 411 | if (offset != 0 || length < folio_size(folio)) |
1c75950b | 412 | return; |
d2ccddf0 | 413 | /* Cancel any unstarted writes on this page */ |
eb5654b3 | 414 | nfs_wb_folio_cancel(inode, folio); |
6d740c76 | 415 | folio_wait_fscache(folio); |
eb5654b3 | 416 | trace_nfs_invalidate_folio(inode, folio); |
cd52ed35 TM |
417 | } |
418 | ||
6b9b3514 | 419 | /* |
3577da4a MWO |
420 | * Attempt to release the private state associated with a folio |
421 | * - Called if either private or fscache flags are set on the folio | |
422 | * - Caller holds folio lock | |
423 | * - Return true (may release folio) or false (may not) | |
6b9b3514 | 424 | */ |
3577da4a | 425 | static bool nfs_release_folio(struct folio *folio, gfp_t gfp) |
cd52ed35 | 426 | { |
3577da4a | 427 | dfprintk(PAGECACHE, "NFS: release_folio(%p)\n", folio); |
b7eaefaa | 428 | |
3577da4a | 429 | /* If the private flag is set, then the folio is not freeable */ |
96780ca5 TM |
430 | if (folio_test_private(folio)) { |
431 | if ((current_gfp_context(gfp) & GFP_KERNEL) != GFP_KERNEL || | |
432 | current_is_kswapd()) | |
433 | return false; | |
434 | if (nfs_wb_folio(folio_file_mapping(folio)->host, folio) < 0) | |
435 | return false; | |
436 | } | |
3577da4a | 437 | return nfs_fscache_release_folio(folio, gfp); |
e3db7691 TM |
438 | } |
439 | ||
520f301c | 440 | static void nfs_check_dirty_writeback(struct folio *folio, |
f919b196 MG |
441 | bool *dirty, bool *writeback) |
442 | { | |
443 | struct nfs_inode *nfsi; | |
520f301c | 444 | struct address_space *mapping = folio->mapping; |
f919b196 MG |
445 | |
446 | /* | |
520f301c MWO |
447 | * Check if an unstable folio is currently being committed and |
448 | * if so, have the VM treat it as if the folio is under writeback | |
449 | * so it will not block due to folios that will shortly be freeable. | |
f919b196 MG |
450 | */ |
451 | nfsi = NFS_I(mapping->host); | |
af7cf057 | 452 | if (atomic_read(&nfsi->commit_info.rpcs_out)) { |
f919b196 MG |
453 | *writeback = true; |
454 | return; | |
455 | } | |
456 | ||
457 | /* | |
520f301c MWO |
458 | * If the private flag is set, then the folio is not freeable |
459 | * and as the inode is not being committed, it's not going to | |
460 | * be cleaned in the near future so treat it as dirty | |
f919b196 | 461 | */ |
520f301c | 462 | if (folio_test_private(folio)) |
f919b196 MG |
463 | *dirty = true; |
464 | } | |
465 | ||
6b9b3514 DH |
466 | /* |
467 | * Attempt to clear the private state associated with a page when an error | |
468 | * occurs that requires the cached contents of an inode to be written back or | |
469 | * destroyed | |
545db45f | 470 | * - Called if either PG_private or fscache is set on the page |
6b9b3514 DH |
471 | * - Caller holds page lock |
472 | * - Return 0 if successful, -error otherwise | |
473 | */ | |
15a30ab2 | 474 | static int nfs_launder_folio(struct folio *folio) |
e3db7691 | 475 | { |
15a30ab2 | 476 | struct inode *inode = folio->mapping->host; |
eb5654b3 | 477 | int ret; |
b7eaefaa | 478 | |
15a30ab2 MWO |
479 | dfprintk(PAGECACHE, "NFS: launder_folio(%ld, %llu)\n", |
480 | inode->i_ino, folio_pos(folio)); | |
b7eaefaa | 481 | |
15a30ab2 | 482 | folio_wait_fscache(folio); |
eb5654b3 TM |
483 | ret = nfs_wb_folio(inode, folio); |
484 | trace_nfs_launder_folio_done(inode, folio, ret); | |
485 | return ret; | |
cd52ed35 TM |
486 | } |
487 | ||
a564b8f0 MG |
488 | static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file, |
489 | sector_t *span) | |
490 | { | |
bd89bc67 MZ |
491 | unsigned long blocks; |
492 | long long isize; | |
4b60c0ff | 493 | int ret; |
4dc73c67 N |
494 | struct inode *inode = file_inode(file); |
495 | struct rpc_clnt *clnt = NFS_CLIENT(inode); | |
496 | struct nfs_client *cl = NFS_SERVER(inode)->nfs_client; | |
bd89bc67 MZ |
497 | |
498 | spin_lock(&inode->i_lock); | |
499 | blocks = inode->i_blocks; | |
500 | isize = inode->i_size; | |
501 | spin_unlock(&inode->i_lock); | |
502 | if (blocks*512 < isize) { | |
503 | pr_warn("swap activate: swapfile has holes\n"); | |
504 | return -EINVAL; | |
505 | } | |
dad2b015 | 506 | |
4b60c0ff N |
507 | ret = rpc_clnt_swap_activate(clnt); |
508 | if (ret) | |
509 | return ret; | |
510 | ret = add_swap_extent(sis, 0, sis->max, 0); | |
511 | if (ret < 0) { | |
512 | rpc_clnt_swap_deactivate(clnt); | |
513 | return ret; | |
514 | } | |
dad2b015 | 515 | |
4b60c0ff | 516 | *span = sis->pages; |
4dc73c67 N |
517 | |
518 | if (cl->rpc_ops->enable_swap) | |
519 | cl->rpc_ops->enable_swap(inode); | |
520 | ||
4b60c0ff N |
521 | sis->flags |= SWP_FS_OPS; |
522 | return ret; | |
a564b8f0 MG |
523 | } |
524 | ||
525 | static void nfs_swap_deactivate(struct file *file) | |
526 | { | |
4dc73c67 N |
527 | struct inode *inode = file_inode(file); |
528 | struct rpc_clnt *clnt = NFS_CLIENT(inode); | |
529 | struct nfs_client *cl = NFS_SERVER(inode)->nfs_client; | |
dad2b015 | 530 | |
3c87ef6e | 531 | rpc_clnt_swap_deactivate(clnt); |
4dc73c67 N |
532 | if (cl->rpc_ops->disable_swap) |
533 | cl->rpc_ops->disable_swap(file_inode(file)); | |
a564b8f0 | 534 | } |
a564b8f0 | 535 | |
f5e54d6e | 536 | const struct address_space_operations nfs_file_aops = { |
65d023af | 537 | .read_folio = nfs_read_folio, |
8786fde8 | 538 | .readahead = nfs_readahead, |
187c82cb | 539 | .dirty_folio = filemap_dirty_folio, |
1da177e4 LT |
540 | .writepage = nfs_writepage, |
541 | .writepages = nfs_writepages, | |
4899f9c8 NP |
542 | .write_begin = nfs_write_begin, |
543 | .write_end = nfs_write_end, | |
6d740c76 | 544 | .invalidate_folio = nfs_invalidate_folio, |
3577da4a | 545 | .release_folio = nfs_release_folio, |
4ae84a80 | 546 | .migrate_folio = nfs_migrate_folio, |
15a30ab2 | 547 | .launder_folio = nfs_launder_folio, |
f919b196 | 548 | .is_dirty_writeback = nfs_check_dirty_writeback, |
f590f333 | 549 | .error_remove_page = generic_error_remove_page, |
a564b8f0 MG |
550 | .swap_activate = nfs_swap_activate, |
551 | .swap_deactivate = nfs_swap_deactivate, | |
eb79f3af | 552 | .swap_rw = nfs_swap_rw, |
1da177e4 LT |
553 | }; |
554 | ||
6b9b3514 DH |
555 | /* |
556 | * Notification that a PTE pointing to an NFS page is about to be made | |
557 | * writable, implying that someone is about to modify the page through a | |
558 | * shared-writable mapping | |
559 | */ | |
01a36844 | 560 | static vm_fault_t nfs_vm_page_mkwrite(struct vm_fault *vmf) |
94387fb1 | 561 | { |
11bac800 | 562 | struct file *filp = vmf->vma->vm_file; |
6de1472f | 563 | struct inode *inode = file_inode(filp); |
94387fb1 | 564 | unsigned pagelen; |
01a36844 | 565 | vm_fault_t ret = VM_FAULT_NOPAGE; |
4899f9c8 | 566 | struct address_space *mapping; |
4fa7a717 | 567 | struct folio *folio = page_folio(vmf->page); |
94387fb1 | 568 | |
1e8968c5 | 569 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n", |
4fa7a717 TM |
570 | filp, filp->f_mapping->host->i_ino, |
571 | (long long)folio_file_pos(folio)); | |
b7eaefaa | 572 | |
9a773e7c TM |
573 | sb_start_pagefault(inode->i_sb); |
574 | ||
545db45f | 575 | /* make sure the cache has finished storing the page */ |
4fa7a717 TM |
576 | if (folio_test_fscache(folio) && |
577 | folio_wait_fscache_killable(folio) < 0) { | |
a6b5a28e DW |
578 | ret = VM_FAULT_RETRY; |
579 | goto out; | |
580 | } | |
545db45f | 581 | |
ef070dcb | 582 | wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING, |
f5d39b02 PZ |
583 | nfs_wait_bit_killable, |
584 | TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); | |
ef070dcb | 585 | |
4fa7a717 TM |
586 | folio_lock(folio); |
587 | mapping = folio_file_mapping(folio); | |
6de1472f | 588 | if (mapping != inode->i_mapping) |
8b1f9ee5 TM |
589 | goto out_unlock; |
590 | ||
4fa7a717 | 591 | folio_wait_writeback(folio); |
2aeb98f4 | 592 | |
4fa7a717 | 593 | pagelen = nfs_folio_length(folio); |
8b1f9ee5 TM |
594 | if (pagelen == 0) |
595 | goto out_unlock; | |
4899f9c8 | 596 | |
bc4866b6 | 597 | ret = VM_FAULT_LOCKED; |
0c493b5c TM |
598 | if (nfs_flush_incompatible(filp, folio) == 0 && |
599 | nfs_update_folio(filp, folio, 0, pagelen) == 0) | |
bc4866b6 | 600 | goto out; |
8b1f9ee5 | 601 | |
bc4866b6 | 602 | ret = VM_FAULT_SIGBUS; |
8b1f9ee5 | 603 | out_unlock: |
4fa7a717 | 604 | folio_unlock(folio); |
bc4866b6 | 605 | out: |
9a773e7c | 606 | sb_end_pagefault(inode->i_sb); |
bc4866b6 | 607 | return ret; |
94387fb1 TM |
608 | } |
609 | ||
f0f37e2f | 610 | static const struct vm_operations_struct nfs_file_vm_ops = { |
94387fb1 | 611 | .fault = filemap_fault, |
f1820361 | 612 | .map_pages = filemap_map_pages, |
94387fb1 TM |
613 | .page_mkwrite = nfs_vm_page_mkwrite, |
614 | }; | |
615 | ||
edaf4369 | 616 | ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 617 | { |
6de1472f AV |
618 | struct file *file = iocb->ki_filp; |
619 | struct inode *inode = file_inode(file); | |
ed7bcdb3 TM |
620 | unsigned int mntflags = NFS_SERVER(inode)->flags; |
621 | ssize_t result, written; | |
ce368536 SM |
622 | errseq_t since; |
623 | int error; | |
1da177e4 | 624 | |
6de1472f | 625 | result = nfs_key_timeout_notify(file, inode); |
dc24826b AA |
626 | if (result) |
627 | return result; | |
628 | ||
89698b24 | 629 | if (iocb->ki_flags & IOCB_DIRECT) |
64158668 | 630 | return nfs_file_direct_write(iocb, from, false); |
1da177e4 | 631 | |
619d30b4 | 632 | dprintk("NFS: write(%pD2, %zu@%Ld)\n", |
18290650 | 633 | file, iov_iter_count(from), (long long) iocb->ki_pos); |
1da177e4 | 634 | |
1da177e4 LT |
635 | if (IS_SWAPFILE(inode)) |
636 | goto out_swapfile; | |
7d52e862 TM |
637 | /* |
638 | * O_APPEND implies that we must revalidate the file length. | |
639 | */ | |
fc9dc401 | 640 | if (iocb->ki_flags & IOCB_APPEND || iocb->ki_pos > i_size_read(inode)) { |
6de1472f | 641 | result = nfs_revalidate_file_size(inode, file); |
7d52e862 | 642 | if (result) |
e6005436 | 643 | return result; |
fe51beec | 644 | } |
1da177e4 | 645 | |
28aa2f9e TM |
646 | nfs_clear_invalid_mapping(file->f_mapping); |
647 | ||
ce368536 | 648 | since = filemap_sample_wb_err(file->f_mapping); |
a5864c99 | 649 | nfs_start_io_write(inode); |
18290650 TM |
650 | result = generic_write_checks(iocb, from); |
651 | if (result > 0) { | |
652 | current->backing_dev_info = inode_to_bdi(inode); | |
800ba295 | 653 | result = generic_perform_write(iocb, from); |
18290650 TM |
654 | current->backing_dev_info = NULL; |
655 | } | |
a5864c99 | 656 | nfs_end_io_write(inode); |
18290650 | 657 | if (result <= 0) |
1da177e4 LT |
658 | goto out; |
659 | ||
c49edecd | 660 | written = result; |
18290650 | 661 | iocb->ki_pos += written; |
e6005436 | 662 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); |
ed7bcdb3 TM |
663 | |
664 | if (mntflags & NFS_MOUNT_WRITE_EAGER) { | |
665 | result = filemap_fdatawrite_range(file->f_mapping, | |
666 | iocb->ki_pos - written, | |
667 | iocb->ki_pos - 1); | |
668 | if (result < 0) | |
669 | goto out; | |
670 | } | |
671 | if (mntflags & NFS_MOUNT_WRITE_WAIT) { | |
384edeb4 LB |
672 | filemap_fdatawait_range(file->f_mapping, |
673 | iocb->ki_pos - written, | |
674 | iocb->ki_pos - 1); | |
ed7bcdb3 | 675 | } |
e973b1a5 | 676 | result = generic_write_sync(iocb, written); |
677 | if (result < 0) | |
e6005436 | 678 | return result; |
7e381172 | 679 | |
e6005436 | 680 | out: |
7e94d6c4 | 681 | /* Return error values */ |
ce368536 | 682 | error = filemap_check_wb_err(file->f_mapping, since); |
e6005436 TM |
683 | switch (error) { |
684 | default: | |
685 | break; | |
686 | case -EDQUOT: | |
687 | case -EFBIG: | |
688 | case -ENOSPC: | |
689 | nfs_wb_all(inode); | |
690 | error = file_check_and_advance_wb_err(file); | |
691 | if (error < 0) | |
692 | result = error; | |
200baa21 | 693 | } |
1da177e4 LT |
694 | return result; |
695 | ||
696 | out_swapfile: | |
697 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
89658c4d | 698 | return -ETXTBSY; |
1da177e4 | 699 | } |
89d77c8f | 700 | EXPORT_SYMBOL_GPL(nfs_file_write); |
1da177e4 | 701 | |
5eebde23 SJ |
702 | static int |
703 | do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
704 | { |
705 | struct inode *inode = filp->f_mapping->host; | |
706 | int status = 0; | |
21ac19d4 | 707 | unsigned int saved_type = fl->fl_type; |
1da177e4 | 708 | |
039c4d7a | 709 | /* Try local locking first */ |
6d34ac19 BF |
710 | posix_test_lock(filp, fl); |
711 | if (fl->fl_type != F_UNLCK) { | |
712 | /* found a conflict */ | |
039c4d7a | 713 | goto out; |
1da177e4 | 714 | } |
21ac19d4 | 715 | fl->fl_type = saved_type; |
039c4d7a | 716 | |
011e2a7f | 717 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
039c4d7a TM |
718 | goto out_noconflict; |
719 | ||
5eebde23 | 720 | if (is_local) |
039c4d7a TM |
721 | goto out_noconflict; |
722 | ||
723 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
724 | out: | |
1da177e4 | 725 | return status; |
039c4d7a TM |
726 | out_noconflict: |
727 | fl->fl_type = F_UNLCK; | |
728 | goto out; | |
1da177e4 LT |
729 | } |
730 | ||
5eebde23 SJ |
731 | static int |
732 | do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
733 | { |
734 | struct inode *inode = filp->f_mapping->host; | |
7a8203d8 | 735 | struct nfs_lock_context *l_ctx; |
1da177e4 LT |
736 | int status; |
737 | ||
1da177e4 LT |
738 | /* |
739 | * Flush all pending writes before doing anything | |
740 | * with locks.. | |
741 | */ | |
aded8d7b | 742 | nfs_wb_all(inode); |
1da177e4 | 743 | |
7a8203d8 TM |
744 | l_ctx = nfs_get_lock_context(nfs_file_open_context(filp)); |
745 | if (!IS_ERR(l_ctx)) { | |
210c7c17 | 746 | status = nfs_iocounter_wait(l_ctx); |
7a8203d8 | 747 | nfs_put_lock_context(l_ctx); |
f30cb757 BC |
748 | /* NOTE: special case |
749 | * If we're signalled while cleaning up locks on process exit, we | |
750 | * still need to complete the unlock. | |
751 | */ | |
752 | if (status < 0 && !(fl->fl_flags & FL_CLOSE)) | |
7a8203d8 TM |
753 | return status; |
754 | } | |
755 | ||
5eebde23 SJ |
756 | /* |
757 | * Use local locking if mounted with "-onolock" or with appropriate | |
758 | * "-olocal_lock=" | |
759 | */ | |
760 | if (!is_local) | |
1da177e4 LT |
761 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
762 | else | |
75575ddf | 763 | status = locks_lock_file_wait(filp, fl); |
1da177e4 LT |
764 | return status; |
765 | } | |
766 | ||
5eebde23 SJ |
767 | static int |
768 | do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
769 | { |
770 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
771 | int status; |
772 | ||
1da177e4 LT |
773 | /* |
774 | * Flush all pending writes before doing anything | |
775 | * with locks.. | |
776 | */ | |
29884df0 TM |
777 | status = nfs_sync_mapping(filp->f_mapping); |
778 | if (status != 0) | |
1da177e4 LT |
779 | goto out; |
780 | ||
5eebde23 SJ |
781 | /* |
782 | * Use local locking if mounted with "-onolock" or with appropriate | |
783 | * "-olocal_lock=" | |
784 | */ | |
785 | if (!is_local) | |
1da177e4 | 786 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
c4d7c402 | 787 | else |
75575ddf | 788 | status = locks_lock_file_wait(filp, fl); |
1da177e4 LT |
789 | if (status < 0) |
790 | goto out; | |
6b96724e | 791 | |
1da177e4 | 792 | /* |
779eafab N |
793 | * Invalidate cache to prevent missing any changes. If |
794 | * the file is mapped, clear the page cache as well so | |
795 | * those mappings will be loaded. | |
6b96724e | 796 | * |
1da177e4 LT |
797 | * This makes locking act as a cache coherency point. |
798 | */ | |
29884df0 | 799 | nfs_sync_mapping(filp->f_mapping); |
779eafab | 800 | if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) { |
442ce049 | 801 | nfs_zap_caches(inode); |
779eafab N |
802 | if (mapping_mapped(filp->f_mapping)) |
803 | nfs_revalidate_mapping(inode, filp->f_mapping); | |
804 | } | |
1da177e4 | 805 | out: |
1da177e4 LT |
806 | return status; |
807 | } | |
808 | ||
809 | /* | |
810 | * Lock a (portion of) a file | |
811 | */ | |
ce4ef7c0 | 812 | int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) |
1da177e4 | 813 | { |
6da24bc9 | 814 | struct inode *inode = filp->f_mapping->host; |
2116271a | 815 | int ret = -ENOLCK; |
5eebde23 | 816 | int is_local = 0; |
1da177e4 | 817 | |
6de1472f AV |
818 | dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n", |
819 | filp, fl->fl_type, fl->fl_flags, | |
1da177e4 | 820 | (long long)fl->fl_start, (long long)fl->fl_end); |
6da24bc9 | 821 | |
91d5b470 | 822 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 | 823 | |
bb0a55bb BF |
824 | if (fl->fl_flags & FL_RECLAIM) |
825 | return -ENOGRACE; | |
826 | ||
5eebde23 SJ |
827 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL) |
828 | is_local = 1; | |
829 | ||
2116271a TM |
830 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { |
831 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); | |
832 | if (ret < 0) | |
833 | goto out_err; | |
834 | } | |
1da177e4 LT |
835 | |
836 | if (IS_GETLK(cmd)) | |
5eebde23 | 837 | ret = do_getlk(filp, cmd, fl, is_local); |
2116271a | 838 | else if (fl->fl_type == F_UNLCK) |
5eebde23 | 839 | ret = do_unlk(filp, cmd, fl, is_local); |
2116271a | 840 | else |
5eebde23 | 841 | ret = do_setlk(filp, cmd, fl, is_local); |
2116271a TM |
842 | out_err: |
843 | return ret; | |
1da177e4 | 844 | } |
89d77c8f | 845 | EXPORT_SYMBOL_GPL(nfs_lock); |
1da177e4 LT |
846 | |
847 | /* | |
848 | * Lock a (portion of) a file | |
849 | */ | |
ce4ef7c0 | 850 | int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) |
1da177e4 | 851 | { |
5eebde23 SJ |
852 | struct inode *inode = filp->f_mapping->host; |
853 | int is_local = 0; | |
854 | ||
6de1472f AV |
855 | dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n", |
856 | filp, fl->fl_type, fl->fl_flags); | |
1da177e4 | 857 | |
1da177e4 LT |
858 | if (!(fl->fl_flags & FL_FLOCK)) |
859 | return -ENOLCK; | |
860 | ||
5eebde23 SJ |
861 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK) |
862 | is_local = 1; | |
863 | ||
fcfa4470 BC |
864 | /* We're simulating flock() locks using posix locks on the server */ |
865 | if (fl->fl_type == F_UNLCK) | |
5eebde23 SJ |
866 | return do_unlk(filp, cmd, fl, is_local); |
867 | return do_setlk(filp, cmd, fl, is_local); | |
1da177e4 | 868 | } |
89d77c8f | 869 | EXPORT_SYMBOL_GPL(nfs_flock); |
370f6599 | 870 | |
0486958f JL |
871 | const struct file_operations nfs_file_operations = { |
872 | .llseek = nfs_file_llseek, | |
3aa2d199 | 873 | .read_iter = nfs_file_read, |
edaf4369 | 874 | .write_iter = nfs_file_write, |
0486958f JL |
875 | .mmap = nfs_file_mmap, |
876 | .open = nfs_file_open, | |
877 | .flush = nfs_file_flush, | |
878 | .release = nfs_file_release, | |
879 | .fsync = nfs_file_fsync, | |
880 | .lock = nfs_lock, | |
881 | .flock = nfs_flock, | |
82c156f8 | 882 | .splice_read = generic_file_splice_read, |
4da54c21 | 883 | .splice_write = iter_file_splice_write, |
0486958f | 884 | .check_flags = nfs_check_flags, |
1c994a09 | 885 | .setlease = simple_nosetlease, |
0486958f | 886 | }; |
ddda8e0a | 887 | EXPORT_SYMBOL_GPL(nfs_file_operations); |