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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/file.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * Changes Copyright (C) 1994 by Florian La Roche | |
7 | * - Do not copy data too often around in the kernel. | |
8 | * - In nfs_file_read the return value of kmalloc wasn't checked. | |
9 | * - Put in a better version of read look-ahead buffering. Original idea | |
10 | * and implementation by Wai S Kok elekokws@ee.nus.sg. | |
11 | * | |
12 | * Expire cache on write to a file by Wai S Kok (Oct 1994). | |
13 | * | |
14 | * Total rewrite of read side for new NFS buffer cache.. Linus. | |
15 | * | |
16 | * nfs regular file handling functions | |
17 | */ | |
18 | ||
19 | #include <linux/time.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/fcntl.h> | |
23 | #include <linux/stat.h> | |
24 | #include <linux/nfs_fs.h> | |
25 | #include <linux/nfs_mount.h> | |
26 | #include <linux/mm.h> | |
1da177e4 | 27 | #include <linux/pagemap.h> |
e8edc6e0 | 28 | #include <linux/aio.h> |
5a0e3ad6 | 29 | #include <linux/gfp.h> |
b608b283 | 30 | #include <linux/swap.h> |
1da177e4 LT |
31 | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/system.h> | |
34 | ||
35 | #include "delegation.h" | |
94387fb1 | 36 | #include "internal.h" |
91d5b470 | 37 | #include "iostat.h" |
545db45f | 38 | #include "fscache.h" |
e5e94017 | 39 | #include "pnfs.h" |
1da177e4 LT |
40 | |
41 | #define NFSDBG_FACILITY NFSDBG_FILE | |
42 | ||
43 | static int nfs_file_open(struct inode *, struct file *); | |
44 | static int nfs_file_release(struct inode *, struct file *); | |
980802e3 | 45 | static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); |
1da177e4 | 46 | static int nfs_file_mmap(struct file *, struct vm_area_struct *); |
f0930fff JA |
47 | static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos, |
48 | struct pipe_inode_info *pipe, | |
49 | size_t count, unsigned int flags); | |
027445c3 BP |
50 | static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, |
51 | unsigned long nr_segs, loff_t pos); | |
bf40d343 SJ |
52 | static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, |
53 | struct file *filp, loff_t *ppos, | |
54 | size_t count, unsigned int flags); | |
027445c3 BP |
55 | static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, |
56 | unsigned long nr_segs, loff_t pos); | |
75e1fcc0 | 57 | static int nfs_file_flush(struct file *, fl_owner_t id); |
02c24a82 | 58 | static int nfs_file_fsync(struct file *, loff_t, loff_t, int datasync); |
1da177e4 LT |
59 | static int nfs_check_flags(int flags); |
60 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); | |
61 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); | |
370f6599 | 62 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl); |
1da177e4 | 63 | |
f0f37e2f | 64 | static const struct vm_operations_struct nfs_file_vm_ops; |
94387fb1 | 65 | |
4b6f5d20 | 66 | const struct file_operations nfs_file_operations = { |
980802e3 | 67 | .llseek = nfs_file_llseek, |
1da177e4 LT |
68 | .read = do_sync_read, |
69 | .write = do_sync_write, | |
027445c3 BP |
70 | .aio_read = nfs_file_read, |
71 | .aio_write = nfs_file_write, | |
1da177e4 LT |
72 | .mmap = nfs_file_mmap, |
73 | .open = nfs_file_open, | |
74 | .flush = nfs_file_flush, | |
75 | .release = nfs_file_release, | |
54917786 | 76 | .fsync = nfs_file_fsync, |
1da177e4 LT |
77 | .lock = nfs_lock, |
78 | .flock = nfs_flock, | |
f0930fff | 79 | .splice_read = nfs_file_splice_read, |
bf40d343 | 80 | .splice_write = nfs_file_splice_write, |
1da177e4 | 81 | .check_flags = nfs_check_flags, |
370f6599 | 82 | .setlease = nfs_setlease, |
1da177e4 LT |
83 | }; |
84 | ||
92e1d5be | 85 | const struct inode_operations nfs_file_inode_operations = { |
1da177e4 LT |
86 | .permission = nfs_permission, |
87 | .getattr = nfs_getattr, | |
88 | .setattr = nfs_setattr, | |
89 | }; | |
90 | ||
b7fa0554 | 91 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 92 | const struct inode_operations nfs3_file_inode_operations = { |
b7fa0554 AG |
93 | .permission = nfs_permission, |
94 | .getattr = nfs_getattr, | |
95 | .setattr = nfs_setattr, | |
96 | .listxattr = nfs3_listxattr, | |
97 | .getxattr = nfs3_getxattr, | |
98 | .setxattr = nfs3_setxattr, | |
99 | .removexattr = nfs3_removexattr, | |
100 | }; | |
101 | #endif /* CONFIG_NFS_v3 */ | |
102 | ||
1da177e4 LT |
103 | /* Hack for future NFS swap support */ |
104 | #ifndef IS_SWAPFILE | |
105 | # define IS_SWAPFILE(inode) (0) | |
106 | #endif | |
107 | ||
108 | static int nfs_check_flags(int flags) | |
109 | { | |
110 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
111 | return -EINVAL; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Open file | |
118 | */ | |
119 | static int | |
120 | nfs_file_open(struct inode *inode, struct file *filp) | |
121 | { | |
1da177e4 LT |
122 | int res; |
123 | ||
6da24bc9 | 124 | dprintk("NFS: open file(%s/%s)\n", |
cc0dd2d1 CL |
125 | filp->f_path.dentry->d_parent->d_name.name, |
126 | filp->f_path.dentry->d_name.name); | |
127 | ||
c2459dc4 | 128 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 LT |
129 | res = nfs_check_flags(filp->f_flags); |
130 | if (res) | |
131 | return res; | |
132 | ||
46cb650c | 133 | res = nfs_open(inode, filp); |
1da177e4 LT |
134 | return res; |
135 | } | |
136 | ||
137 | static int | |
138 | nfs_file_release(struct inode *inode, struct file *filp) | |
139 | { | |
6da24bc9 CL |
140 | struct dentry *dentry = filp->f_path.dentry; |
141 | ||
142 | dprintk("NFS: release(%s/%s)\n", | |
143 | dentry->d_parent->d_name.name, | |
144 | dentry->d_name.name); | |
145 | ||
91d5b470 | 146 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
46cb650c | 147 | return nfs_release(inode, filp); |
1da177e4 LT |
148 | } |
149 | ||
980802e3 TM |
150 | /** |
151 | * nfs_revalidate_size - Revalidate the file size | |
152 | * @inode - pointer to inode struct | |
153 | * @file - pointer to struct file | |
154 | * | |
155 | * Revalidates the file length. This is basically a wrapper around | |
156 | * nfs_revalidate_inode() that takes into account the fact that we may | |
157 | * have cached writes (in which case we don't care about the server's | |
158 | * idea of what the file length is), or O_DIRECT (in which case we | |
159 | * shouldn't trust the cache). | |
160 | */ | |
161 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
162 | { | |
163 | struct nfs_server *server = NFS_SERVER(inode); | |
164 | struct nfs_inode *nfsi = NFS_I(inode); | |
165 | ||
d7cf8dd0 TM |
166 | if (nfs_have_delegated_attributes(inode)) |
167 | goto out_noreval; | |
168 | ||
980802e3 TM |
169 | if (filp->f_flags & O_DIRECT) |
170 | goto force_reval; | |
d7cf8dd0 TM |
171 | if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
172 | goto force_reval; | |
173 | if (nfs_attribute_timeout(inode)) | |
174 | goto force_reval; | |
175 | out_noreval: | |
176 | return 0; | |
980802e3 TM |
177 | force_reval: |
178 | return __nfs_revalidate_inode(server, inode); | |
179 | } | |
180 | ||
181 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
182 | { | |
9465efc9 | 183 | loff_t loff; |
e89e896d | 184 | |
6da24bc9 | 185 | dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
186 | filp->f_path.dentry->d_parent->d_name.name, |
187 | filp->f_path.dentry->d_name.name, | |
188 | offset, origin); | |
189 | ||
06222e49 JB |
190 | /* |
191 | * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate | |
192 | * the cached file length | |
193 | */ | |
194 | if (origin != SEEK_SET || origin != SEEK_CUR) { | |
980802e3 | 195 | struct inode *inode = filp->f_mapping->host; |
d5e66348 | 196 | |
980802e3 TM |
197 | int retval = nfs_revalidate_file_size(inode, filp); |
198 | if (retval < 0) | |
199 | return (loff_t)retval; | |
d5e66348 | 200 | |
ef3d0fd2 | 201 | /* AK: should drop this lock. Unlikely to be needed. */ |
d5e66348 | 202 | spin_lock(&inode->i_lock); |
ef3d0fd2 | 203 | loff = generic_file_llseek(filp, offset, origin); |
d5e66348 TM |
204 | spin_unlock(&inode->i_lock); |
205 | } else | |
ef3d0fd2 | 206 | loff = generic_file_llseek(filp, offset, origin); |
9465efc9 | 207 | return loff; |
980802e3 TM |
208 | } |
209 | ||
1da177e4 LT |
210 | /* |
211 | * Flush all dirty pages, and check for write errors. | |
1da177e4 LT |
212 | */ |
213 | static int | |
75e1fcc0 | 214 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 215 | { |
6da24bc9 CL |
216 | struct dentry *dentry = file->f_path.dentry; |
217 | struct inode *inode = dentry->d_inode; | |
1da177e4 | 218 | |
6da24bc9 CL |
219 | dprintk("NFS: flush(%s/%s)\n", |
220 | dentry->d_parent->d_name.name, | |
221 | dentry->d_name.name); | |
1da177e4 | 222 | |
c2459dc4 | 223 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
1da177e4 LT |
224 | if ((file->f_mode & FMODE_WRITE) == 0) |
225 | return 0; | |
7b159fc1 | 226 | |
7fe5c398 | 227 | /* Flush writes to the server and return any errors */ |
af7fa165 | 228 | return vfs_fsync(file, 0); |
1da177e4 LT |
229 | } |
230 | ||
231 | static ssize_t | |
027445c3 BP |
232 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
233 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 234 | { |
01cce933 | 235 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
236 | struct inode * inode = dentry->d_inode; |
237 | ssize_t result; | |
027445c3 | 238 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 239 | |
1da177e4 | 240 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 241 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
1da177e4 | 242 | |
6da24bc9 | 243 | dprintk("NFS: read(%s/%s, %lu@%lu)\n", |
1da177e4 LT |
244 | dentry->d_parent->d_name.name, dentry->d_name.name, |
245 | (unsigned long) count, (unsigned long) pos); | |
246 | ||
44b11874 | 247 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
4184dcf2 | 248 | if (!result) { |
027445c3 | 249 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
4184dcf2 CL |
250 | if (result > 0) |
251 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result); | |
252 | } | |
1da177e4 LT |
253 | return result; |
254 | } | |
255 | ||
256 | static ssize_t | |
f0930fff JA |
257 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
258 | struct pipe_inode_info *pipe, size_t count, | |
259 | unsigned int flags) | |
1da177e4 | 260 | { |
01cce933 | 261 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
262 | struct inode *inode = dentry->d_inode; |
263 | ssize_t res; | |
264 | ||
6da24bc9 | 265 | dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", |
1da177e4 LT |
266 | dentry->d_parent->d_name.name, dentry->d_name.name, |
267 | (unsigned long) count, (unsigned long long) *ppos); | |
268 | ||
44b11874 | 269 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
aa2f1ef1 | 270 | if (!res) { |
f0930fff | 271 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
aa2f1ef1 CL |
272 | if (res > 0) |
273 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res); | |
274 | } | |
1da177e4 LT |
275 | return res; |
276 | } | |
277 | ||
278 | static int | |
279 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
280 | { | |
01cce933 | 281 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
282 | struct inode *inode = dentry->d_inode; |
283 | int status; | |
284 | ||
6da24bc9 | 285 | dprintk("NFS: mmap(%s/%s)\n", |
1da177e4 LT |
286 | dentry->d_parent->d_name.name, dentry->d_name.name); |
287 | ||
e1ebfd33 TM |
288 | /* Note: generic_file_mmap() returns ENOSYS on nommu systems |
289 | * so we call that before revalidating the mapping | |
290 | */ | |
291 | status = generic_file_mmap(file, vma); | |
94387fb1 TM |
292 | if (!status) { |
293 | vma->vm_ops = &nfs_file_vm_ops; | |
e1ebfd33 | 294 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 | 295 | } |
1da177e4 LT |
296 | return status; |
297 | } | |
298 | ||
299 | /* | |
300 | * Flush any dirty pages for this process, and check for write errors. | |
301 | * The return status from this call provides a reliable indication of | |
302 | * whether any write errors occurred for this process. | |
af7fa165 TM |
303 | * |
304 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to | |
305 | * disk, but it retrieves and clears ctx->error after synching, despite | |
306 | * the two being set at the same time in nfs_context_set_write_error(). | |
307 | * This is because the former is used to notify the _next_ call to | |
25985edc | 308 | * nfs_file_write() that a write error occurred, and hence cause it to |
af7fa165 | 309 | * fall back to doing a synchronous write. |
1da177e4 LT |
310 | */ |
311 | static int | |
02c24a82 | 312 | nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1da177e4 | 313 | { |
7ea80859 | 314 | struct dentry *dentry = file->f_path.dentry; |
cd3758e3 | 315 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 316 | struct inode *inode = dentry->d_inode; |
af7fa165 TM |
317 | int have_error, status; |
318 | int ret = 0; | |
319 | ||
6da24bc9 | 320 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
54917786 CL |
321 | dentry->d_parent->d_name.name, dentry->d_name.name, |
322 | datasync); | |
1da177e4 | 323 | |
02c24a82 JB |
324 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
325 | if (ret) | |
326 | return ret; | |
327 | mutex_lock(&inode->i_mutex); | |
328 | ||
91d5b470 | 329 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
af7fa165 TM |
330 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
331 | status = nfs_commit_inode(inode, FLUSH_SYNC); | |
332 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
333 | if (have_error) | |
334 | ret = xchg(&ctx->error, 0); | |
0702099b | 335 | if (!ret && status < 0) |
af7fa165 | 336 | ret = status; |
863a3c6c AA |
337 | if (!ret && !datasync) |
338 | /* application has asked for meta-data sync */ | |
ef311537 | 339 | ret = pnfs_layoutcommit_inode(inode, true); |
02c24a82 | 340 | mutex_unlock(&inode->i_mutex); |
af7fa165 | 341 | return ret; |
1da177e4 LT |
342 | } |
343 | ||
38c73044 PS |
344 | /* |
345 | * Decide whether a read/modify/write cycle may be more efficient | |
346 | * then a modify/write/read cycle when writing to a page in the | |
347 | * page cache. | |
348 | * | |
349 | * The modify/write/read cycle may occur if a page is read before | |
350 | * being completely filled by the writer. In this situation, the | |
351 | * page must be completely written to stable storage on the server | |
352 | * before it can be refilled by reading in the page from the server. | |
353 | * This can lead to expensive, small, FILE_SYNC mode writes being | |
354 | * done. | |
355 | * | |
356 | * It may be more efficient to read the page first if the file is | |
357 | * open for reading in addition to writing, the page is not marked | |
358 | * as Uptodate, it is not dirty or waiting to be committed, | |
359 | * indicating that it was previously allocated and then modified, | |
360 | * that there were valid bytes of data in that range of the file, | |
361 | * and that the new data won't completely replace the old data in | |
362 | * that range of the file. | |
363 | */ | |
364 | static int nfs_want_read_modify_write(struct file *file, struct page *page, | |
365 | loff_t pos, unsigned len) | |
366 | { | |
367 | unsigned int pglen = nfs_page_length(page); | |
368 | unsigned int offset = pos & (PAGE_CACHE_SIZE - 1); | |
369 | unsigned int end = offset + len; | |
370 | ||
371 | if ((file->f_mode & FMODE_READ) && /* open for read? */ | |
372 | !PageUptodate(page) && /* Uptodate? */ | |
373 | !PagePrivate(page) && /* i/o request already? */ | |
374 | pglen && /* valid bytes of file? */ | |
375 | (end < pglen || offset)) /* replace all valid bytes? */ | |
376 | return 1; | |
377 | return 0; | |
378 | } | |
379 | ||
1da177e4 | 380 | /* |
4899f9c8 NP |
381 | * This does the "real" work of the write. We must allocate and lock the |
382 | * page to be sent back to the generic routine, which then copies the | |
383 | * data from user space. | |
1da177e4 LT |
384 | * |
385 | * If the writer ends up delaying the write, the writer needs to | |
386 | * increment the page use counts until he is done with the page. | |
387 | */ | |
4899f9c8 NP |
388 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
389 | loff_t pos, unsigned len, unsigned flags, | |
390 | struct page **pagep, void **fsdata) | |
1da177e4 | 391 | { |
4899f9c8 | 392 | int ret; |
38c73044 | 393 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
4899f9c8 | 394 | struct page *page; |
38c73044 | 395 | int once_thru = 0; |
4899f9c8 | 396 | |
b7eaefaa CL |
397 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
398 | file->f_path.dentry->d_parent->d_name.name, | |
399 | file->f_path.dentry->d_name.name, | |
400 | mapping->host->i_ino, len, (long long) pos); | |
401 | ||
38c73044 | 402 | start: |
72cb77f4 TM |
403 | /* |
404 | * Prevent starvation issues if someone is doing a consistency | |
405 | * sync-to-disk | |
406 | */ | |
407 | ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, | |
408 | nfs_wait_bit_killable, TASK_KILLABLE); | |
409 | if (ret) | |
410 | return ret; | |
411 | ||
54566b2c | 412 | page = grab_cache_page_write_begin(mapping, index, flags); |
4899f9c8 NP |
413 | if (!page) |
414 | return -ENOMEM; | |
415 | *pagep = page; | |
416 | ||
417 | ret = nfs_flush_incompatible(file, page); | |
418 | if (ret) { | |
419 | unlock_page(page); | |
420 | page_cache_release(page); | |
38c73044 PS |
421 | } else if (!once_thru && |
422 | nfs_want_read_modify_write(file, page, pos, len)) { | |
423 | once_thru = 1; | |
424 | ret = nfs_readpage(file, page); | |
425 | page_cache_release(page); | |
426 | if (!ret) | |
427 | goto start; | |
4899f9c8 NP |
428 | } |
429 | return ret; | |
1da177e4 LT |
430 | } |
431 | ||
4899f9c8 NP |
432 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
433 | loff_t pos, unsigned len, unsigned copied, | |
434 | struct page *page, void *fsdata) | |
1da177e4 | 435 | { |
4899f9c8 NP |
436 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
437 | int status; | |
1da177e4 | 438 | |
b7eaefaa CL |
439 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
440 | file->f_path.dentry->d_parent->d_name.name, | |
441 | file->f_path.dentry->d_name.name, | |
442 | mapping->host->i_ino, len, (long long) pos); | |
443 | ||
efc91ed0 TM |
444 | /* |
445 | * Zero any uninitialised parts of the page, and then mark the page | |
446 | * as up to date if it turns out that we're extending the file. | |
447 | */ | |
448 | if (!PageUptodate(page)) { | |
449 | unsigned pglen = nfs_page_length(page); | |
450 | unsigned end = offset + len; | |
451 | ||
452 | if (pglen == 0) { | |
453 | zero_user_segments(page, 0, offset, | |
454 | end, PAGE_CACHE_SIZE); | |
455 | SetPageUptodate(page); | |
456 | } else if (end >= pglen) { | |
457 | zero_user_segment(page, end, PAGE_CACHE_SIZE); | |
458 | if (offset == 0) | |
459 | SetPageUptodate(page); | |
460 | } else | |
461 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); | |
462 | } | |
463 | ||
4899f9c8 | 464 | status = nfs_updatepage(file, page, offset, copied); |
4899f9c8 NP |
465 | |
466 | unlock_page(page); | |
467 | page_cache_release(page); | |
468 | ||
3d509e54 CL |
469 | if (status < 0) |
470 | return status; | |
471 | return copied; | |
1da177e4 LT |
472 | } |
473 | ||
6b9b3514 DH |
474 | /* |
475 | * Partially or wholly invalidate a page | |
476 | * - Release the private state associated with a page if undergoing complete | |
477 | * page invalidation | |
545db45f | 478 | * - Called if either PG_private or PG_fscache is set on the page |
6b9b3514 DH |
479 | * - Caller holds page lock |
480 | */ | |
2ff28e22 | 481 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 482 | { |
b7eaefaa CL |
483 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); |
484 | ||
1c75950b TM |
485 | if (offset != 0) |
486 | return; | |
d2ccddf0 | 487 | /* Cancel any unstarted writes on this page */ |
1b3b4a1a | 488 | nfs_wb_page_cancel(page->mapping->host, page); |
545db45f DH |
489 | |
490 | nfs_fscache_invalidate_page(page, page->mapping->host); | |
cd52ed35 TM |
491 | } |
492 | ||
6b9b3514 DH |
493 | /* |
494 | * Attempt to release the private state associated with a page | |
545db45f | 495 | * - Called if either PG_private or PG_fscache is set on the page |
6b9b3514 DH |
496 | * - Caller holds page lock |
497 | * - Return true (may release page) or false (may not) | |
498 | */ | |
cd52ed35 TM |
499 | static int nfs_release_page(struct page *page, gfp_t gfp) |
500 | { | |
b608b283 TM |
501 | struct address_space *mapping = page->mapping; |
502 | ||
b7eaefaa CL |
503 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
504 | ||
d812e575 | 505 | /* Only do I/O if gfp is a superset of GFP_KERNEL */ |
b608b283 TM |
506 | if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) { |
507 | int how = FLUSH_SYNC; | |
508 | ||
509 | /* Don't let kswapd deadlock waiting for OOM RPC calls */ | |
510 | if (current_is_kswapd()) | |
511 | how = 0; | |
512 | nfs_commit_inode(mapping->host, how); | |
513 | } | |
e3db7691 | 514 | /* If PagePrivate() is set, then the page is not freeable */ |
545db45f DH |
515 | if (PagePrivate(page)) |
516 | return 0; | |
517 | return nfs_fscache_release_page(page, gfp); | |
e3db7691 TM |
518 | } |
519 | ||
6b9b3514 DH |
520 | /* |
521 | * Attempt to clear the private state associated with a page when an error | |
522 | * occurs that requires the cached contents of an inode to be written back or | |
523 | * destroyed | |
545db45f | 524 | * - Called if either PG_private or fscache is set on the page |
6b9b3514 DH |
525 | * - Caller holds page lock |
526 | * - Return 0 if successful, -error otherwise | |
527 | */ | |
e3db7691 TM |
528 | static int nfs_launder_page(struct page *page) |
529 | { | |
b7eaefaa | 530 | struct inode *inode = page->mapping->host; |
545db45f | 531 | struct nfs_inode *nfsi = NFS_I(inode); |
b7eaefaa CL |
532 | |
533 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", | |
534 | inode->i_ino, (long long)page_offset(page)); | |
535 | ||
545db45f | 536 | nfs_fscache_wait_on_page_write(nfsi, page); |
b7eaefaa | 537 | return nfs_wb_page(inode, page); |
cd52ed35 TM |
538 | } |
539 | ||
f5e54d6e | 540 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
541 | .readpage = nfs_readpage, |
542 | .readpages = nfs_readpages, | |
9cccef95 | 543 | .set_page_dirty = __set_page_dirty_nobuffers, |
1da177e4 LT |
544 | .writepage = nfs_writepage, |
545 | .writepages = nfs_writepages, | |
4899f9c8 NP |
546 | .write_begin = nfs_write_begin, |
547 | .write_end = nfs_write_end, | |
cd52ed35 TM |
548 | .invalidatepage = nfs_invalidate_page, |
549 | .releasepage = nfs_release_page, | |
1da177e4 | 550 | .direct_IO = nfs_direct_IO, |
074cc1de | 551 | .migratepage = nfs_migrate_page, |
e3db7691 | 552 | .launder_page = nfs_launder_page, |
f590f333 | 553 | .error_remove_page = generic_error_remove_page, |
1da177e4 LT |
554 | }; |
555 | ||
6b9b3514 DH |
556 | /* |
557 | * Notification that a PTE pointing to an NFS page is about to be made | |
558 | * writable, implying that someone is about to modify the page through a | |
559 | * shared-writable mapping | |
560 | */ | |
c2ec175c | 561 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
94387fb1 | 562 | { |
c2ec175c | 563 | struct page *page = vmf->page; |
94387fb1 | 564 | struct file *filp = vma->vm_file; |
b7eaefaa | 565 | struct dentry *dentry = filp->f_path.dentry; |
94387fb1 | 566 | unsigned pagelen; |
bc4866b6 | 567 | int ret = VM_FAULT_NOPAGE; |
4899f9c8 | 568 | struct address_space *mapping; |
94387fb1 | 569 | |
b7eaefaa CL |
570 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
571 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
572 | filp->f_mapping->host->i_ino, | |
573 | (long long)page_offset(page)); | |
574 | ||
545db45f DH |
575 | /* make sure the cache has finished storing the page */ |
576 | nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page); | |
577 | ||
94387fb1 | 578 | lock_page(page); |
4899f9c8 | 579 | mapping = page->mapping; |
b7eaefaa | 580 | if (mapping != dentry->d_inode->i_mapping) |
8b1f9ee5 TM |
581 | goto out_unlock; |
582 | ||
94387fb1 | 583 | pagelen = nfs_page_length(page); |
8b1f9ee5 TM |
584 | if (pagelen == 0) |
585 | goto out_unlock; | |
4899f9c8 | 586 | |
bc4866b6 TM |
587 | ret = VM_FAULT_LOCKED; |
588 | if (nfs_flush_incompatible(filp, page) == 0 && | |
589 | nfs_updatepage(filp, page, 0, pagelen) == 0) | |
590 | goto out; | |
8b1f9ee5 | 591 | |
bc4866b6 | 592 | ret = VM_FAULT_SIGBUS; |
8b1f9ee5 TM |
593 | out_unlock: |
594 | unlock_page(page); | |
bc4866b6 TM |
595 | out: |
596 | return ret; | |
94387fb1 TM |
597 | } |
598 | ||
f0f37e2f | 599 | static const struct vm_operations_struct nfs_file_vm_ops = { |
94387fb1 TM |
600 | .fault = filemap_fault, |
601 | .page_mkwrite = nfs_vm_page_mkwrite, | |
602 | }; | |
603 | ||
7b159fc1 TM |
604 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
605 | { | |
606 | struct nfs_open_context *ctx; | |
607 | ||
6b2f3d1f | 608 | if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC)) |
7b159fc1 | 609 | return 1; |
cd3758e3 | 610 | ctx = nfs_file_open_context(filp); |
7b159fc1 TM |
611 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
612 | return 1; | |
613 | return 0; | |
614 | } | |
615 | ||
027445c3 BP |
616 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
617 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 618 | { |
01cce933 | 619 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 | 620 | struct inode * inode = dentry->d_inode; |
7e381172 | 621 | unsigned long written = 0; |
1da177e4 | 622 | ssize_t result; |
027445c3 | 623 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 624 | |
1da177e4 | 625 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 626 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 | 627 | |
6da24bc9 | 628 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
1da177e4 | 629 | dentry->d_parent->d_name.name, dentry->d_name.name, |
6da24bc9 | 630 | (unsigned long) count, (long long) pos); |
1da177e4 LT |
631 | |
632 | result = -EBUSY; | |
633 | if (IS_SWAPFILE(inode)) | |
634 | goto out_swapfile; | |
7d52e862 TM |
635 | /* |
636 | * O_APPEND implies that we must revalidate the file length. | |
637 | */ | |
638 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
639 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
640 | if (result) | |
641 | goto out; | |
fe51beec | 642 | } |
1da177e4 LT |
643 | |
644 | result = count; | |
645 | if (!count) | |
646 | goto out; | |
647 | ||
027445c3 | 648 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
7e381172 CL |
649 | if (result > 0) |
650 | written = result; | |
651 | ||
6b2f3d1f | 652 | /* Return error values for O_DSYNC and IS_SYNC() */ |
7b159fc1 | 653 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
af7fa165 | 654 | int err = vfs_fsync(iocb->ki_filp, 0); |
200baa21 TM |
655 | if (err < 0) |
656 | result = err; | |
657 | } | |
7e381172 CL |
658 | if (result > 0) |
659 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); | |
1da177e4 LT |
660 | out: |
661 | return result; | |
662 | ||
663 | out_swapfile: | |
664 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
665 | goto out; | |
666 | } | |
667 | ||
bf40d343 SJ |
668 | static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, |
669 | struct file *filp, loff_t *ppos, | |
670 | size_t count, unsigned int flags) | |
671 | { | |
672 | struct dentry *dentry = filp->f_path.dentry; | |
673 | struct inode *inode = dentry->d_inode; | |
7e381172 | 674 | unsigned long written = 0; |
bf40d343 SJ |
675 | ssize_t ret; |
676 | ||
677 | dprintk("NFS splice_write(%s/%s, %lu@%llu)\n", | |
678 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
679 | (unsigned long) count, (unsigned long long) *ppos); | |
680 | ||
681 | /* | |
682 | * The combination of splice and an O_APPEND destination is disallowed. | |
683 | */ | |
684 | ||
bf40d343 | 685 | ret = generic_file_splice_write(pipe, filp, ppos, count, flags); |
7e381172 CL |
686 | if (ret > 0) |
687 | written = ret; | |
688 | ||
bf40d343 | 689 | if (ret >= 0 && nfs_need_sync_write(filp, inode)) { |
af7fa165 | 690 | int err = vfs_fsync(filp, 0); |
bf40d343 SJ |
691 | if (err < 0) |
692 | ret = err; | |
693 | } | |
7e381172 CL |
694 | if (ret > 0) |
695 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); | |
bf40d343 SJ |
696 | return ret; |
697 | } | |
698 | ||
5eebde23 SJ |
699 | static int |
700 | do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
701 | { |
702 | struct inode *inode = filp->f_mapping->host; | |
703 | int status = 0; | |
21ac19d4 | 704 | unsigned int saved_type = fl->fl_type; |
1da177e4 | 705 | |
039c4d7a | 706 | /* Try local locking first */ |
6d34ac19 BF |
707 | posix_test_lock(filp, fl); |
708 | if (fl->fl_type != F_UNLCK) { | |
709 | /* found a conflict */ | |
039c4d7a | 710 | goto out; |
1da177e4 | 711 | } |
21ac19d4 | 712 | fl->fl_type = saved_type; |
039c4d7a TM |
713 | |
714 | if (nfs_have_delegation(inode, FMODE_READ)) | |
715 | goto out_noconflict; | |
716 | ||
5eebde23 | 717 | if (is_local) |
039c4d7a TM |
718 | goto out_noconflict; |
719 | ||
720 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
721 | out: | |
1da177e4 | 722 | return status; |
039c4d7a TM |
723 | out_noconflict: |
724 | fl->fl_type = F_UNLCK; | |
725 | goto out; | |
1da177e4 LT |
726 | } |
727 | ||
728 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
729 | { | |
730 | int res = 0; | |
731 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
732 | case FL_POSIX: | |
733 | res = posix_lock_file_wait(file, fl); | |
734 | break; | |
735 | case FL_FLOCK: | |
736 | res = flock_lock_file_wait(file, fl); | |
737 | break; | |
738 | default: | |
739 | BUG(); | |
740 | } | |
1da177e4 LT |
741 | return res; |
742 | } | |
743 | ||
5eebde23 SJ |
744 | static int |
745 | do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
746 | { |
747 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
748 | int status; |
749 | ||
1da177e4 LT |
750 | /* |
751 | * Flush all pending writes before doing anything | |
752 | * with locks.. | |
753 | */ | |
29884df0 | 754 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
755 | |
756 | /* NOTE: special case | |
757 | * If we're signalled while cleaning up locks on process exit, we | |
758 | * still need to complete the unlock. | |
759 | */ | |
5eebde23 SJ |
760 | /* |
761 | * Use local locking if mounted with "-onolock" or with appropriate | |
762 | * "-olocal_lock=" | |
763 | */ | |
764 | if (!is_local) | |
1da177e4 LT |
765 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
766 | else | |
767 | status = do_vfs_lock(filp, fl); | |
1da177e4 LT |
768 | return status; |
769 | } | |
770 | ||
6b96724e RL |
771 | static int |
772 | is_time_granular(struct timespec *ts) { | |
773 | return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000)); | |
774 | } | |
775 | ||
5eebde23 SJ |
776 | static int |
777 | do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
778 | { |
779 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
780 | int status; |
781 | ||
1da177e4 LT |
782 | /* |
783 | * Flush all pending writes before doing anything | |
784 | * with locks.. | |
785 | */ | |
29884df0 TM |
786 | status = nfs_sync_mapping(filp->f_mapping); |
787 | if (status != 0) | |
1da177e4 LT |
788 | goto out; |
789 | ||
5eebde23 SJ |
790 | /* |
791 | * Use local locking if mounted with "-onolock" or with appropriate | |
792 | * "-olocal_lock=" | |
793 | */ | |
794 | if (!is_local) | |
1da177e4 | 795 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
c4d7c402 | 796 | else |
1da177e4 | 797 | status = do_vfs_lock(filp, fl); |
1da177e4 LT |
798 | if (status < 0) |
799 | goto out; | |
6b96724e | 800 | |
1da177e4 | 801 | /* |
6b96724e RL |
802 | * Revalidate the cache if the server has time stamps granular |
803 | * enough to detect subsecond changes. Otherwise, clear the | |
804 | * cache to prevent missing any changes. | |
805 | * | |
1da177e4 LT |
806 | * This makes locking act as a cache coherency point. |
807 | */ | |
29884df0 | 808 | nfs_sync_mapping(filp->f_mapping); |
6b96724e RL |
809 | if (!nfs_have_delegation(inode, FMODE_READ)) { |
810 | if (is_time_granular(&NFS_SERVER(inode)->time_delta)) | |
811 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
812 | else | |
813 | nfs_zap_caches(inode); | |
814 | } | |
1da177e4 | 815 | out: |
1da177e4 LT |
816 | return status; |
817 | } | |
818 | ||
819 | /* | |
820 | * Lock a (portion of) a file | |
821 | */ | |
822 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
823 | { | |
6da24bc9 | 824 | struct inode *inode = filp->f_mapping->host; |
2116271a | 825 | int ret = -ENOLCK; |
5eebde23 | 826 | int is_local = 0; |
1da177e4 | 827 | |
6da24bc9 CL |
828 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", |
829 | filp->f_path.dentry->d_parent->d_name.name, | |
830 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
831 | fl->fl_type, fl->fl_flags, |
832 | (long long)fl->fl_start, (long long)fl->fl_end); | |
6da24bc9 | 833 | |
91d5b470 | 834 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
835 | |
836 | /* No mandatory locks over NFS */ | |
dfad9441 | 837 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
2116271a TM |
838 | goto out_err; |
839 | ||
5eebde23 SJ |
840 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL) |
841 | is_local = 1; | |
842 | ||
2116271a TM |
843 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { |
844 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); | |
845 | if (ret < 0) | |
846 | goto out_err; | |
847 | } | |
1da177e4 LT |
848 | |
849 | if (IS_GETLK(cmd)) | |
5eebde23 | 850 | ret = do_getlk(filp, cmd, fl, is_local); |
2116271a | 851 | else if (fl->fl_type == F_UNLCK) |
5eebde23 | 852 | ret = do_unlk(filp, cmd, fl, is_local); |
2116271a | 853 | else |
5eebde23 | 854 | ret = do_setlk(filp, cmd, fl, is_local); |
2116271a TM |
855 | out_err: |
856 | return ret; | |
1da177e4 LT |
857 | } |
858 | ||
859 | /* | |
860 | * Lock a (portion of) a file | |
861 | */ | |
862 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
863 | { | |
5eebde23 SJ |
864 | struct inode *inode = filp->f_mapping->host; |
865 | int is_local = 0; | |
866 | ||
6da24bc9 CL |
867 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", |
868 | filp->f_path.dentry->d_parent->d_name.name, | |
869 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
870 | fl->fl_type, fl->fl_flags); |
871 | ||
1da177e4 LT |
872 | if (!(fl->fl_flags & FL_FLOCK)) |
873 | return -ENOLCK; | |
874 | ||
5eebde23 SJ |
875 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK) |
876 | is_local = 1; | |
877 | ||
1da177e4 LT |
878 | /* We're simulating flock() locks using posix locks on the server */ |
879 | fl->fl_owner = (fl_owner_t)filp; | |
880 | fl->fl_start = 0; | |
881 | fl->fl_end = OFFSET_MAX; | |
882 | ||
883 | if (fl->fl_type == F_UNLCK) | |
5eebde23 SJ |
884 | return do_unlk(filp, cmd, fl, is_local); |
885 | return do_setlk(filp, cmd, fl, is_local); | |
1da177e4 | 886 | } |
370f6599 | 887 | |
6da24bc9 CL |
888 | /* |
889 | * There is no protocol support for leases, so we have no way to implement | |
890 | * them correctly in the face of opens by other clients. | |
891 | */ | |
370f6599 BF |
892 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
893 | { | |
6da24bc9 CL |
894 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
895 | file->f_path.dentry->d_parent->d_name.name, | |
896 | file->f_path.dentry->d_name.name, arg); | |
370f6599 BF |
897 | return -EINVAL; |
898 | } |