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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/open.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | #include <linux/string.h> | |
8 | #include <linux/mm.h> | |
1da177e4 | 9 | #include <linux/file.h> |
9f3acc31 | 10 | #include <linux/fdtable.h> |
0eeca283 | 11 | #include <linux/fsnotify.h> |
1da177e4 | 12 | #include <linux/module.h> |
1da177e4 LT |
13 | #include <linux/tty.h> |
14 | #include <linux/namei.h> | |
15 | #include <linux/backing-dev.h> | |
16f7e0fe | 16 | #include <linux/capability.h> |
086f7316 | 17 | #include <linux/securebits.h> |
1da177e4 LT |
18 | #include <linux/security.h> |
19 | #include <linux/mount.h> | |
5590ff0d | 20 | #include <linux/fcntl.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 LT |
22 | #include <asm/uaccess.h> |
23 | #include <linux/fs.h> | |
ef3daeda | 24 | #include <linux/personality.h> |
1da177e4 LT |
25 | #include <linux/pagemap.h> |
26 | #include <linux/syscalls.h> | |
ab2af1f5 | 27 | #include <linux/rcupdate.h> |
73241ccc | 28 | #include <linux/audit.h> |
97ac7350 | 29 | #include <linux/falloc.h> |
5ad4e53b | 30 | #include <linux/fs_struct.h> |
b65a9cfc | 31 | #include <linux/ima.h> |
2dfc1cae | 32 | #include <linux/dnotify.h> |
1da177e4 | 33 | |
e81e3f4d EP |
34 | #include "internal.h" |
35 | ||
4a30131e N |
36 | int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, |
37 | struct file *filp) | |
1da177e4 | 38 | { |
939a9421 | 39 | int ret; |
1da177e4 LT |
40 | struct iattr newattrs; |
41 | ||
42 | /* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */ | |
43 | if (length < 0) | |
44 | return -EINVAL; | |
45 | ||
46 | newattrs.ia_size = length; | |
4a30131e | 47 | newattrs.ia_valid = ATTR_SIZE | time_attrs; |
cc4e69de MS |
48 | if (filp) { |
49 | newattrs.ia_file = filp; | |
50 | newattrs.ia_valid |= ATTR_FILE; | |
51 | } | |
1da177e4 | 52 | |
7b82dc0e | 53 | /* Remove suid/sgid on truncate too */ |
939a9421 AW |
54 | ret = should_remove_suid(dentry); |
55 | if (ret) | |
56 | newattrs.ia_valid |= ret | ATTR_FORCE; | |
7b82dc0e | 57 | |
1b1dcc1b | 58 | mutex_lock(&dentry->d_inode->i_mutex); |
939a9421 | 59 | ret = notify_change(dentry, &newattrs); |
1b1dcc1b | 60 | mutex_unlock(&dentry->d_inode->i_mutex); |
939a9421 | 61 | return ret; |
1da177e4 LT |
62 | } |
63 | ||
2d8f3038 | 64 | static long do_sys_truncate(const char __user *pathname, loff_t length) |
1da177e4 | 65 | { |
2d8f3038 AV |
66 | struct path path; |
67 | struct inode *inode; | |
1da177e4 LT |
68 | int error; |
69 | ||
70 | error = -EINVAL; | |
71 | if (length < 0) /* sorry, but loff_t says... */ | |
72 | goto out; | |
73 | ||
2d8f3038 | 74 | error = user_path(pathname, &path); |
1da177e4 LT |
75 | if (error) |
76 | goto out; | |
2d8f3038 | 77 | inode = path.dentry->d_inode; |
1da177e4 LT |
78 | |
79 | /* For directories it's -EISDIR, for other non-regulars - -EINVAL */ | |
80 | error = -EISDIR; | |
81 | if (S_ISDIR(inode->i_mode)) | |
82 | goto dput_and_out; | |
83 | ||
84 | error = -EINVAL; | |
85 | if (!S_ISREG(inode->i_mode)) | |
86 | goto dput_and_out; | |
87 | ||
2d8f3038 | 88 | error = mnt_want_write(path.mnt); |
1da177e4 LT |
89 | if (error) |
90 | goto dput_and_out; | |
91 | ||
256984a8 | 92 | error = inode_permission(inode, MAY_WRITE); |
9ac9b847 DH |
93 | if (error) |
94 | goto mnt_drop_write_and_out; | |
1da177e4 LT |
95 | |
96 | error = -EPERM; | |
c82e42da | 97 | if (IS_APPEND(inode)) |
9ac9b847 | 98 | goto mnt_drop_write_and_out; |
1da177e4 | 99 | |
9700382c | 100 | error = get_write_access(inode); |
1da177e4 | 101 | if (error) |
9ac9b847 | 102 | goto mnt_drop_write_and_out; |
1da177e4 | 103 | |
9700382c | 104 | /* |
105 | * Make sure that there are no leases. get_write_access() protects | |
106 | * against the truncate racing with a lease-granting setlease(). | |
107 | */ | |
8737c930 | 108 | error = break_lease(inode, O_WRONLY); |
1da177e4 | 109 | if (error) |
9700382c | 110 | goto put_write_and_out; |
1da177e4 LT |
111 | |
112 | error = locks_verify_truncate(inode, NULL, length); | |
be6d3e56 KT |
113 | if (!error) |
114 | error = security_path_truncate(&path, length, 0); | |
907f4554 | 115 | if (!error) |
2d8f3038 | 116 | error = do_truncate(path.dentry, length, 0, NULL); |
1da177e4 | 117 | |
9700382c | 118 | put_write_and_out: |
119 | put_write_access(inode); | |
9ac9b847 | 120 | mnt_drop_write_and_out: |
2d8f3038 | 121 | mnt_drop_write(path.mnt); |
1da177e4 | 122 | dput_and_out: |
2d8f3038 | 123 | path_put(&path); |
1da177e4 LT |
124 | out: |
125 | return error; | |
126 | } | |
127 | ||
4fd8da8d | 128 | SYSCALL_DEFINE2(truncate, const char __user *, path, long, length) |
1da177e4 | 129 | { |
4fd8da8d | 130 | return do_sys_truncate(path, length); |
1da177e4 LT |
131 | } |
132 | ||
b01ec0ef | 133 | static long do_sys_ftruncate(unsigned int fd, loff_t length, int small) |
1da177e4 LT |
134 | { |
135 | struct inode * inode; | |
136 | struct dentry *dentry; | |
137 | struct file * file; | |
138 | int error; | |
139 | ||
140 | error = -EINVAL; | |
141 | if (length < 0) | |
142 | goto out; | |
143 | error = -EBADF; | |
144 | file = fget(fd); | |
145 | if (!file) | |
146 | goto out; | |
147 | ||
148 | /* explicitly opened as large or we are on 64-bit box */ | |
149 | if (file->f_flags & O_LARGEFILE) | |
150 | small = 0; | |
151 | ||
0f7fc9e4 | 152 | dentry = file->f_path.dentry; |
1da177e4 LT |
153 | inode = dentry->d_inode; |
154 | error = -EINVAL; | |
155 | if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE)) | |
156 | goto out_putf; | |
157 | ||
158 | error = -EINVAL; | |
159 | /* Cannot ftruncate over 2^31 bytes without large file support */ | |
160 | if (small && length > MAX_NON_LFS) | |
161 | goto out_putf; | |
162 | ||
163 | error = -EPERM; | |
164 | if (IS_APPEND(inode)) | |
165 | goto out_putf; | |
166 | ||
167 | error = locks_verify_truncate(inode, file, length); | |
be6d3e56 KT |
168 | if (!error) |
169 | error = security_path_truncate(&file->f_path, length, | |
170 | ATTR_MTIME|ATTR_CTIME); | |
1da177e4 | 171 | if (!error) |
6e656be8 | 172 | error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file); |
1da177e4 LT |
173 | out_putf: |
174 | fput(file); | |
175 | out: | |
176 | return error; | |
177 | } | |
178 | ||
bdc480e3 | 179 | SYSCALL_DEFINE2(ftruncate, unsigned int, fd, unsigned long, length) |
1da177e4 | 180 | { |
0a489cb3 | 181 | long ret = do_sys_ftruncate(fd, length, 1); |
385910f2 | 182 | /* avoid REGPARM breakage on x86: */ |
54a01510 | 183 | asmlinkage_protect(2, ret, fd, length); |
0a489cb3 | 184 | return ret; |
1da177e4 LT |
185 | } |
186 | ||
187 | /* LFS versions of truncate are only needed on 32 bit machines */ | |
188 | #if BITS_PER_LONG == 32 | |
6673e0c3 | 189 | SYSCALL_DEFINE(truncate64)(const char __user * path, loff_t length) |
1da177e4 LT |
190 | { |
191 | return do_sys_truncate(path, length); | |
192 | } | |
6673e0c3 HC |
193 | #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS |
194 | asmlinkage long SyS_truncate64(long path, loff_t length) | |
195 | { | |
196 | return SYSC_truncate64((const char __user *) path, length); | |
197 | } | |
198 | SYSCALL_ALIAS(sys_truncate64, SyS_truncate64); | |
199 | #endif | |
1da177e4 | 200 | |
6673e0c3 | 201 | SYSCALL_DEFINE(ftruncate64)(unsigned int fd, loff_t length) |
1da177e4 | 202 | { |
0a489cb3 | 203 | long ret = do_sys_ftruncate(fd, length, 0); |
385910f2 | 204 | /* avoid REGPARM breakage on x86: */ |
54a01510 | 205 | asmlinkage_protect(2, ret, fd, length); |
0a489cb3 | 206 | return ret; |
1da177e4 | 207 | } |
6673e0c3 HC |
208 | #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS |
209 | asmlinkage long SyS_ftruncate64(long fd, loff_t length) | |
210 | { | |
211 | return SYSC_ftruncate64((unsigned int) fd, length); | |
212 | } | |
213 | SYSCALL_ALIAS(sys_ftruncate64, SyS_ftruncate64); | |
1da177e4 | 214 | #endif |
6673e0c3 | 215 | #endif /* BITS_PER_LONG == 32 */ |
1da177e4 | 216 | |
3e63cbb1 AJ |
217 | |
218 | int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len) | |
97ac7350 | 219 | { |
3e63cbb1 AJ |
220 | struct inode *inode = file->f_path.dentry->d_inode; |
221 | long ret; | |
97ac7350 AA |
222 | |
223 | if (offset < 0 || len <= 0) | |
3e63cbb1 | 224 | return -EINVAL; |
97ac7350 AA |
225 | |
226 | /* Return error if mode is not supported */ | |
97ac7350 | 227 | if (mode && !(mode & FALLOC_FL_KEEP_SIZE)) |
3e63cbb1 | 228 | return -EOPNOTSUPP; |
97ac7350 | 229 | |
97ac7350 | 230 | if (!(file->f_mode & FMODE_WRITE)) |
3e63cbb1 | 231 | return -EBADF; |
97ac7350 AA |
232 | /* |
233 | * Revalidate the write permissions, in case security policy has | |
234 | * changed since the files were opened. | |
235 | */ | |
236 | ret = security_file_permission(file, MAY_WRITE); | |
237 | if (ret) | |
3e63cbb1 | 238 | return ret; |
97ac7350 | 239 | |
97ac7350 | 240 | if (S_ISFIFO(inode->i_mode)) |
3e63cbb1 | 241 | return -ESPIPE; |
97ac7350 | 242 | |
97ac7350 AA |
243 | /* |
244 | * Let individual file system decide if it supports preallocation | |
245 | * for directories or not. | |
246 | */ | |
247 | if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) | |
3e63cbb1 | 248 | return -ENODEV; |
97ac7350 | 249 | |
97ac7350 AA |
250 | /* Check for wrap through zero too */ |
251 | if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0)) | |
3e63cbb1 | 252 | return -EFBIG; |
97ac7350 | 253 | |
3e63cbb1 AJ |
254 | if (!inode->i_op->fallocate) |
255 | return -EOPNOTSUPP; | |
97ac7350 | 256 | |
3e63cbb1 AJ |
257 | return inode->i_op->fallocate(inode, mode, offset, len); |
258 | } | |
259 | ||
260 | SYSCALL_DEFINE(fallocate)(int fd, int mode, loff_t offset, loff_t len) | |
261 | { | |
262 | struct file *file; | |
263 | int error = -EBADF; | |
264 | ||
265 | file = fget(fd); | |
266 | if (file) { | |
267 | error = do_fallocate(file, mode, offset, len); | |
268 | fput(file); | |
269 | } | |
270 | ||
271 | return error; | |
97ac7350 | 272 | } |
3e63cbb1 | 273 | |
6673e0c3 HC |
274 | #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS |
275 | asmlinkage long SyS_fallocate(long fd, long mode, loff_t offset, loff_t len) | |
276 | { | |
277 | return SYSC_fallocate((int)fd, (int)mode, offset, len); | |
278 | } | |
279 | SYSCALL_ALIAS(sys_fallocate, SyS_fallocate); | |
280 | #endif | |
97ac7350 | 281 | |
1da177e4 LT |
282 | /* |
283 | * access() needs to use the real uid/gid, not the effective uid/gid. | |
284 | * We do this by temporarily clearing all FS-related capabilities and | |
285 | * switching the fsuid/fsgid around to the real ones. | |
286 | */ | |
6559eed8 | 287 | SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode) |
1da177e4 | 288 | { |
d84f4f99 DH |
289 | const struct cred *old_cred; |
290 | struct cred *override_cred; | |
2d8f3038 | 291 | struct path path; |
256984a8 | 292 | struct inode *inode; |
1da177e4 LT |
293 | int res; |
294 | ||
295 | if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */ | |
296 | return -EINVAL; | |
297 | ||
d84f4f99 DH |
298 | override_cred = prepare_creds(); |
299 | if (!override_cred) | |
300 | return -ENOMEM; | |
1da177e4 | 301 | |
d84f4f99 DH |
302 | override_cred->fsuid = override_cred->uid; |
303 | override_cred->fsgid = override_cred->gid; | |
1da177e4 | 304 | |
086f7316 | 305 | if (!issecure(SECURE_NO_SETUID_FIXUP)) { |
1cdcbec1 | 306 | /* Clear the capabilities if we switch to a non-root user */ |
d84f4f99 DH |
307 | if (override_cred->uid) |
308 | cap_clear(override_cred->cap_effective); | |
086f7316 | 309 | else |
d84f4f99 DH |
310 | override_cred->cap_effective = |
311 | override_cred->cap_permitted; | |
086f7316 | 312 | } |
1da177e4 | 313 | |
d84f4f99 DH |
314 | old_cred = override_creds(override_cred); |
315 | ||
2d8f3038 | 316 | res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path); |
6902d925 DH |
317 | if (res) |
318 | goto out; | |
319 | ||
2d8f3038 | 320 | inode = path.dentry->d_inode; |
256984a8 AV |
321 | |
322 | if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
30524472 AV |
323 | /* |
324 | * MAY_EXEC on regular files is denied if the fs is mounted | |
325 | * with the "noexec" flag. | |
326 | */ | |
327 | res = -EACCES; | |
2d8f3038 | 328 | if (path.mnt->mnt_flags & MNT_NOEXEC) |
30524472 AV |
329 | goto out_path_release; |
330 | } | |
331 | ||
256984a8 | 332 | res = inode_permission(inode, mode | MAY_ACCESS); |
6902d925 | 333 | /* SuS v2 requires we report a read only fs too */ |
256984a8 | 334 | if (res || !(mode & S_IWOTH) || special_file(inode->i_mode)) |
6902d925 | 335 | goto out_path_release; |
2f676cbc DH |
336 | /* |
337 | * This is a rare case where using __mnt_is_readonly() | |
338 | * is OK without a mnt_want/drop_write() pair. Since | |
339 | * no actual write to the fs is performed here, we do | |
340 | * not need to telegraph to that to anyone. | |
341 | * | |
342 | * By doing this, we accept that this access is | |
343 | * inherently racy and know that the fs may change | |
344 | * state before we even see this result. | |
345 | */ | |
2d8f3038 | 346 | if (__mnt_is_readonly(path.mnt)) |
6902d925 | 347 | res = -EROFS; |
1da177e4 | 348 | |
6902d925 | 349 | out_path_release: |
2d8f3038 | 350 | path_put(&path); |
6902d925 | 351 | out: |
d84f4f99 DH |
352 | revert_creds(old_cred); |
353 | put_cred(override_cred); | |
1da177e4 LT |
354 | return res; |
355 | } | |
356 | ||
ca013e94 | 357 | SYSCALL_DEFINE2(access, const char __user *, filename, int, mode) |
5590ff0d UD |
358 | { |
359 | return sys_faccessat(AT_FDCWD, filename, mode); | |
360 | } | |
361 | ||
3cdad428 | 362 | SYSCALL_DEFINE1(chdir, const char __user *, filename) |
1da177e4 | 363 | { |
2d8f3038 | 364 | struct path path; |
1da177e4 LT |
365 | int error; |
366 | ||
2d8f3038 | 367 | error = user_path_dir(filename, &path); |
1da177e4 LT |
368 | if (error) |
369 | goto out; | |
370 | ||
2d8f3038 | 371 | error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); |
1da177e4 LT |
372 | if (error) |
373 | goto dput_and_out; | |
374 | ||
2d8f3038 | 375 | set_fs_pwd(current->fs, &path); |
1da177e4 LT |
376 | |
377 | dput_and_out: | |
2d8f3038 | 378 | path_put(&path); |
1da177e4 LT |
379 | out: |
380 | return error; | |
381 | } | |
382 | ||
3cdad428 | 383 | SYSCALL_DEFINE1(fchdir, unsigned int, fd) |
1da177e4 LT |
384 | { |
385 | struct file *file; | |
1da177e4 | 386 | struct inode *inode; |
1da177e4 LT |
387 | int error; |
388 | ||
389 | error = -EBADF; | |
390 | file = fget(fd); | |
391 | if (!file) | |
392 | goto out; | |
393 | ||
ac748a09 | 394 | inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
395 | |
396 | error = -ENOTDIR; | |
397 | if (!S_ISDIR(inode->i_mode)) | |
398 | goto out_putf; | |
399 | ||
256984a8 | 400 | error = inode_permission(inode, MAY_EXEC | MAY_ACCESS); |
1da177e4 | 401 | if (!error) |
ac748a09 | 402 | set_fs_pwd(current->fs, &file->f_path); |
1da177e4 LT |
403 | out_putf: |
404 | fput(file); | |
405 | out: | |
406 | return error; | |
407 | } | |
408 | ||
3480b257 | 409 | SYSCALL_DEFINE1(chroot, const char __user *, filename) |
1da177e4 | 410 | { |
2d8f3038 | 411 | struct path path; |
1da177e4 LT |
412 | int error; |
413 | ||
2d8f3038 | 414 | error = user_path_dir(filename, &path); |
1da177e4 LT |
415 | if (error) |
416 | goto out; | |
417 | ||
2d8f3038 | 418 | error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); |
1da177e4 LT |
419 | if (error) |
420 | goto dput_and_out; | |
421 | ||
422 | error = -EPERM; | |
423 | if (!capable(CAP_SYS_CHROOT)) | |
424 | goto dput_and_out; | |
8b8efb44 TH |
425 | error = security_path_chroot(&path); |
426 | if (error) | |
427 | goto dput_and_out; | |
1da177e4 | 428 | |
2d8f3038 | 429 | set_fs_root(current->fs, &path); |
1da177e4 LT |
430 | error = 0; |
431 | dput_and_out: | |
2d8f3038 | 432 | path_put(&path); |
1da177e4 LT |
433 | out: |
434 | return error; | |
435 | } | |
436 | ||
a26eab24 | 437 | SYSCALL_DEFINE2(fchmod, unsigned int, fd, mode_t, mode) |
1da177e4 LT |
438 | { |
439 | struct inode * inode; | |
440 | struct dentry * dentry; | |
441 | struct file * file; | |
442 | int err = -EBADF; | |
443 | struct iattr newattrs; | |
444 | ||
445 | file = fget(fd); | |
446 | if (!file) | |
447 | goto out; | |
448 | ||
0f7fc9e4 | 449 | dentry = file->f_path.dentry; |
1da177e4 LT |
450 | inode = dentry->d_inode; |
451 | ||
5a190ae6 | 452 | audit_inode(NULL, dentry); |
73241ccc | 453 | |
96029c4e | 454 | err = mnt_want_write_file(file); |
2af482a7 | 455 | if (err) |
1da177e4 | 456 | goto out_putf; |
fe542cf5 | 457 | mutex_lock(&inode->i_mutex); |
89eda068 TH |
458 | err = security_path_chmod(dentry, file->f_vfsmnt, mode); |
459 | if (err) | |
fe542cf5 | 460 | goto out_unlock; |
1da177e4 LT |
461 | if (mode == (mode_t) -1) |
462 | mode = inode->i_mode; | |
463 | newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); | |
464 | newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; | |
465 | err = notify_change(dentry, &newattrs); | |
fe542cf5 | 466 | out_unlock: |
1b1dcc1b | 467 | mutex_unlock(&inode->i_mutex); |
2af482a7 | 468 | mnt_drop_write(file->f_path.mnt); |
1da177e4 LT |
469 | out_putf: |
470 | fput(file); | |
471 | out: | |
472 | return err; | |
473 | } | |
474 | ||
6559eed8 | 475 | SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, mode_t, mode) |
1da177e4 | 476 | { |
2d8f3038 AV |
477 | struct path path; |
478 | struct inode *inode; | |
1da177e4 LT |
479 | int error; |
480 | struct iattr newattrs; | |
481 | ||
2d8f3038 | 482 | error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path); |
1da177e4 LT |
483 | if (error) |
484 | goto out; | |
2d8f3038 | 485 | inode = path.dentry->d_inode; |
1da177e4 | 486 | |
2d8f3038 | 487 | error = mnt_want_write(path.mnt); |
2af482a7 | 488 | if (error) |
1da177e4 | 489 | goto dput_and_out; |
fe542cf5 | 490 | mutex_lock(&inode->i_mutex); |
89eda068 TH |
491 | error = security_path_chmod(path.dentry, path.mnt, mode); |
492 | if (error) | |
fe542cf5 | 493 | goto out_unlock; |
1da177e4 LT |
494 | if (mode == (mode_t) -1) |
495 | mode = inode->i_mode; | |
496 | newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); | |
497 | newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; | |
2d8f3038 | 498 | error = notify_change(path.dentry, &newattrs); |
fe542cf5 | 499 | out_unlock: |
1b1dcc1b | 500 | mutex_unlock(&inode->i_mutex); |
2d8f3038 | 501 | mnt_drop_write(path.mnt); |
1da177e4 | 502 | dput_and_out: |
2d8f3038 | 503 | path_put(&path); |
1da177e4 LT |
504 | out: |
505 | return error; | |
506 | } | |
507 | ||
a26eab24 | 508 | SYSCALL_DEFINE2(chmod, const char __user *, filename, mode_t, mode) |
5590ff0d UD |
509 | { |
510 | return sys_fchmodat(AT_FDCWD, filename, mode); | |
511 | } | |
512 | ||
fe542cf5 | 513 | static int chown_common(struct path *path, uid_t user, gid_t group) |
1da177e4 | 514 | { |
fe542cf5 | 515 | struct inode *inode = path->dentry->d_inode; |
1da177e4 LT |
516 | int error; |
517 | struct iattr newattrs; | |
518 | ||
1da177e4 LT |
519 | newattrs.ia_valid = ATTR_CTIME; |
520 | if (user != (uid_t) -1) { | |
521 | newattrs.ia_valid |= ATTR_UID; | |
522 | newattrs.ia_uid = user; | |
523 | } | |
524 | if (group != (gid_t) -1) { | |
525 | newattrs.ia_valid |= ATTR_GID; | |
526 | newattrs.ia_gid = group; | |
527 | } | |
528 | if (!S_ISDIR(inode->i_mode)) | |
b5376771 SH |
529 | newattrs.ia_valid |= |
530 | ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; | |
1b1dcc1b | 531 | mutex_lock(&inode->i_mutex); |
fe542cf5 TH |
532 | error = security_path_chown(path, user, group); |
533 | if (!error) | |
534 | error = notify_change(path->dentry, &newattrs); | |
1b1dcc1b | 535 | mutex_unlock(&inode->i_mutex); |
beb29e05 | 536 | |
1da177e4 LT |
537 | return error; |
538 | } | |
539 | ||
ca013e94 | 540 | SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group) |
1da177e4 | 541 | { |
2d8f3038 | 542 | struct path path; |
1da177e4 LT |
543 | int error; |
544 | ||
2d8f3038 | 545 | error = user_path(filename, &path); |
6902d925 DH |
546 | if (error) |
547 | goto out; | |
2d8f3038 | 548 | error = mnt_want_write(path.mnt); |
2af482a7 DH |
549 | if (error) |
550 | goto out_release; | |
fe542cf5 | 551 | error = chown_common(&path, user, group); |
2d8f3038 | 552 | mnt_drop_write(path.mnt); |
2af482a7 | 553 | out_release: |
2d8f3038 | 554 | path_put(&path); |
6902d925 | 555 | out: |
1da177e4 LT |
556 | return error; |
557 | } | |
558 | ||
6559eed8 HC |
559 | SYSCALL_DEFINE5(fchownat, int, dfd, const char __user *, filename, uid_t, user, |
560 | gid_t, group, int, flag) | |
5590ff0d | 561 | { |
2d8f3038 | 562 | struct path path; |
5590ff0d UD |
563 | int error = -EINVAL; |
564 | int follow; | |
565 | ||
566 | if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) | |
567 | goto out; | |
568 | ||
569 | follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW; | |
2d8f3038 | 570 | error = user_path_at(dfd, filename, follow, &path); |
6902d925 DH |
571 | if (error) |
572 | goto out; | |
2d8f3038 | 573 | error = mnt_want_write(path.mnt); |
2af482a7 DH |
574 | if (error) |
575 | goto out_release; | |
fe542cf5 | 576 | error = chown_common(&path, user, group); |
2d8f3038 | 577 | mnt_drop_write(path.mnt); |
2af482a7 | 578 | out_release: |
2d8f3038 | 579 | path_put(&path); |
5590ff0d UD |
580 | out: |
581 | return error; | |
582 | } | |
583 | ||
ca013e94 | 584 | SYSCALL_DEFINE3(lchown, const char __user *, filename, uid_t, user, gid_t, group) |
1da177e4 | 585 | { |
2d8f3038 | 586 | struct path path; |
1da177e4 LT |
587 | int error; |
588 | ||
2d8f3038 | 589 | error = user_lpath(filename, &path); |
6902d925 DH |
590 | if (error) |
591 | goto out; | |
2d8f3038 | 592 | error = mnt_want_write(path.mnt); |
2af482a7 DH |
593 | if (error) |
594 | goto out_release; | |
fe542cf5 | 595 | error = chown_common(&path, user, group); |
2d8f3038 | 596 | mnt_drop_write(path.mnt); |
2af482a7 | 597 | out_release: |
2d8f3038 | 598 | path_put(&path); |
6902d925 | 599 | out: |
1da177e4 LT |
600 | return error; |
601 | } | |
602 | ||
ca013e94 | 603 | SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group) |
1da177e4 LT |
604 | { |
605 | struct file * file; | |
606 | int error = -EBADF; | |
6902d925 | 607 | struct dentry * dentry; |
1da177e4 LT |
608 | |
609 | file = fget(fd); | |
6902d925 DH |
610 | if (!file) |
611 | goto out; | |
612 | ||
96029c4e | 613 | error = mnt_want_write_file(file); |
2af482a7 DH |
614 | if (error) |
615 | goto out_fput; | |
0f7fc9e4 | 616 | dentry = file->f_path.dentry; |
5a190ae6 | 617 | audit_inode(NULL, dentry); |
fe542cf5 | 618 | error = chown_common(&file->f_path, user, group); |
2af482a7 DH |
619 | mnt_drop_write(file->f_path.mnt); |
620 | out_fput: | |
6902d925 DH |
621 | fput(file); |
622 | out: | |
1da177e4 LT |
623 | return error; |
624 | } | |
625 | ||
4a3fd211 DH |
626 | /* |
627 | * You have to be very careful that these write | |
628 | * counts get cleaned up in error cases and | |
629 | * upon __fput(). This should probably never | |
630 | * be called outside of __dentry_open(). | |
631 | */ | |
632 | static inline int __get_file_write_access(struct inode *inode, | |
633 | struct vfsmount *mnt) | |
634 | { | |
635 | int error; | |
636 | error = get_write_access(inode); | |
637 | if (error) | |
638 | return error; | |
639 | /* | |
640 | * Do not take mount writer counts on | |
641 | * special files since no writes to | |
642 | * the mount itself will occur. | |
643 | */ | |
644 | if (!special_file(inode->i_mode)) { | |
645 | /* | |
646 | * Balanced in __fput() | |
647 | */ | |
648 | error = mnt_want_write(mnt); | |
649 | if (error) | |
650 | put_write_access(inode); | |
651 | } | |
652 | return error; | |
653 | } | |
654 | ||
a1a5b3d9 | 655 | static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt, |
482928d5 | 656 | struct file *f, |
745ca247 DH |
657 | int (*open)(struct inode *, struct file *), |
658 | const struct cred *cred) | |
1da177e4 | 659 | { |
1da177e4 LT |
660 | struct inode *inode; |
661 | int error; | |
662 | ||
5300990c | 663 | f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK | |
a1a5b3d9 | 664 | FMODE_PREAD | FMODE_PWRITE; |
1da177e4 LT |
665 | inode = dentry->d_inode; |
666 | if (f->f_mode & FMODE_WRITE) { | |
4a3fd211 | 667 | error = __get_file_write_access(inode, mnt); |
1da177e4 LT |
668 | if (error) |
669 | goto cleanup_file; | |
ad775f5a DH |
670 | if (!special_file(inode->i_mode)) |
671 | file_take_write(f); | |
1da177e4 LT |
672 | } |
673 | ||
674 | f->f_mapping = inode->i_mapping; | |
0f7fc9e4 JJS |
675 | f->f_path.dentry = dentry; |
676 | f->f_path.mnt = mnt; | |
1da177e4 LT |
677 | f->f_pos = 0; |
678 | f->f_op = fops_get(inode->i_fop); | |
679 | file_move(f, &inode->i_sb->s_files); | |
680 | ||
745ca247 | 681 | error = security_dentry_open(f, cred); |
788e7dd4 YN |
682 | if (error) |
683 | goto cleanup_all; | |
684 | ||
834f2a4a TM |
685 | if (!open && f->f_op) |
686 | open = f->f_op->open; | |
687 | if (open) { | |
688 | error = open(inode, f); | |
1da177e4 LT |
689 | if (error) |
690 | goto cleanup_all; | |
691 | } | |
b65a9cfc | 692 | ima_counts_get(f); |
834f2a4a | 693 | |
1da177e4 LT |
694 | f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); |
695 | ||
696 | file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping); | |
697 | ||
698 | /* NB: we're sure to have correct a_ops only after f_op->open */ | |
699 | if (f->f_flags & O_DIRECT) { | |
ceffc078 CO |
700 | if (!f->f_mapping->a_ops || |
701 | ((!f->f_mapping->a_ops->direct_IO) && | |
70688e4d | 702 | (!f->f_mapping->a_ops->get_xip_mem))) { |
1da177e4 LT |
703 | fput(f); |
704 | f = ERR_PTR(-EINVAL); | |
705 | } | |
706 | } | |
707 | ||
708 | return f; | |
709 | ||
710 | cleanup_all: | |
711 | fops_put(f->f_op); | |
4a3fd211 | 712 | if (f->f_mode & FMODE_WRITE) { |
1da177e4 | 713 | put_write_access(inode); |
ad775f5a DH |
714 | if (!special_file(inode->i_mode)) { |
715 | /* | |
716 | * We don't consider this a real | |
717 | * mnt_want/drop_write() pair | |
718 | * because it all happenend right | |
719 | * here, so just reset the state. | |
720 | */ | |
721 | file_reset_write(f); | |
4a3fd211 | 722 | mnt_drop_write(mnt); |
ad775f5a | 723 | } |
4a3fd211 | 724 | } |
1da177e4 | 725 | file_kill(f); |
0f7fc9e4 JJS |
726 | f->f_path.dentry = NULL; |
727 | f->f_path.mnt = NULL; | |
1da177e4 LT |
728 | cleanup_file: |
729 | put_filp(f); | |
1da177e4 LT |
730 | dput(dentry); |
731 | mntput(mnt); | |
732 | return ERR_PTR(error); | |
733 | } | |
734 | ||
834f2a4a TM |
735 | /** |
736 | * lookup_instantiate_filp - instantiates the open intent filp | |
737 | * @nd: pointer to nameidata | |
738 | * @dentry: pointer to dentry | |
739 | * @open: open callback | |
740 | * | |
741 | * Helper for filesystems that want to use lookup open intents and pass back | |
742 | * a fully instantiated struct file to the caller. | |
743 | * This function is meant to be called from within a filesystem's | |
744 | * lookup method. | |
9a56c213 OD |
745 | * Beware of calling it for non-regular files! Those ->open methods might block |
746 | * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo, | |
747 | * leading to a deadlock, as nobody can open that fifo anymore, because | |
748 | * another process to open fifo will block on locked parent when doing lookup). | |
834f2a4a TM |
749 | * Note that in case of error, nd->intent.open.file is destroyed, but the |
750 | * path information remains valid. | |
751 | * If the open callback is set to NULL, then the standard f_op->open() | |
752 | * filesystem callback is substituted. | |
753 | */ | |
754 | struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, | |
755 | int (*open)(struct inode *, struct file *)) | |
756 | { | |
745ca247 DH |
757 | const struct cred *cred = current_cred(); |
758 | ||
834f2a4a TM |
759 | if (IS_ERR(nd->intent.open.file)) |
760 | goto out; | |
761 | if (IS_ERR(dentry)) | |
762 | goto out_err; | |
4ac91378 | 763 | nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt), |
834f2a4a | 764 | nd->intent.open.file, |
745ca247 | 765 | open, cred); |
834f2a4a TM |
766 | out: |
767 | return nd->intent.open.file; | |
768 | out_err: | |
769 | release_open_intent(nd); | |
770 | nd->intent.open.file = (struct file *)dentry; | |
771 | goto out; | |
772 | } | |
773 | EXPORT_SYMBOL_GPL(lookup_instantiate_filp); | |
774 | ||
775 | /** | |
776 | * nameidata_to_filp - convert a nameidata to an open filp. | |
777 | * @nd: pointer to nameidata | |
778 | * @flags: open flags | |
779 | * | |
780 | * Note that this function destroys the original nameidata | |
781 | */ | |
482928d5 | 782 | struct file *nameidata_to_filp(struct nameidata *nd) |
834f2a4a | 783 | { |
745ca247 | 784 | const struct cred *cred = current_cred(); |
834f2a4a TM |
785 | struct file *filp; |
786 | ||
787 | /* Pick up the filp from the open intent */ | |
788 | filp = nd->intent.open.file; | |
789 | /* Has the filesystem initialised the file for us? */ | |
0f7fc9e4 | 790 | if (filp->f_path.dentry == NULL) |
482928d5 | 791 | filp = __dentry_open(nd->path.dentry, nd->path.mnt, filp, |
745ca247 | 792 | NULL, cred); |
834f2a4a | 793 | else |
1d957f9b | 794 | path_put(&nd->path); |
834f2a4a TM |
795 | return filp; |
796 | } | |
797 | ||
6fdcc216 PS |
798 | /* |
799 | * dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an | |
800 | * error. | |
801 | */ | |
745ca247 DH |
802 | struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags, |
803 | const struct cred *cred) | |
a1a5b3d9 PS |
804 | { |
805 | int error; | |
806 | struct file *f; | |
807 | ||
e0e81739 DH |
808 | validate_creds(cred); |
809 | ||
322ee5b3 CH |
810 | /* |
811 | * We must always pass in a valid mount pointer. Historically | |
812 | * callers got away with not passing it, but we must enforce this at | |
813 | * the earliest possible point now to avoid strange problems deep in the | |
814 | * filesystem stack. | |
815 | */ | |
816 | if (!mnt) { | |
817 | printk(KERN_WARNING "%s called with NULL vfsmount\n", __func__); | |
818 | dump_stack(); | |
819 | return ERR_PTR(-EINVAL); | |
820 | } | |
821 | ||
a1a5b3d9 PS |
822 | error = -ENFILE; |
823 | f = get_empty_filp(); | |
6fdcc216 PS |
824 | if (f == NULL) { |
825 | dput(dentry); | |
826 | mntput(mnt); | |
a1a5b3d9 | 827 | return ERR_PTR(error); |
6fdcc216 | 828 | } |
a1a5b3d9 | 829 | |
482928d5 AV |
830 | f->f_flags = flags; |
831 | return __dentry_open(dentry, mnt, f, NULL, cred); | |
a1a5b3d9 | 832 | } |
1da177e4 LT |
833 | EXPORT_SYMBOL(dentry_open); |
834 | ||
b01ec0ef | 835 | static void __put_unused_fd(struct files_struct *files, unsigned int fd) |
1da177e4 | 836 | { |
badf1662 DS |
837 | struct fdtable *fdt = files_fdtable(files); |
838 | __FD_CLR(fd, fdt->open_fds); | |
0c9e63fd ED |
839 | if (fd < files->next_fd) |
840 | files->next_fd = fd; | |
1da177e4 LT |
841 | } |
842 | ||
fc9b52cd | 843 | void put_unused_fd(unsigned int fd) |
1da177e4 LT |
844 | { |
845 | struct files_struct *files = current->files; | |
846 | spin_lock(&files->file_lock); | |
847 | __put_unused_fd(files, fd); | |
848 | spin_unlock(&files->file_lock); | |
849 | } | |
850 | ||
851 | EXPORT_SYMBOL(put_unused_fd); | |
852 | ||
853 | /* | |
5590ff0d | 854 | * Install a file pointer in the fd array. |
1da177e4 LT |
855 | * |
856 | * The VFS is full of places where we drop the files lock between | |
857 | * setting the open_fds bitmap and installing the file in the file | |
858 | * array. At any such point, we are vulnerable to a dup2() race | |
859 | * installing a file in the array before us. We need to detect this and | |
860 | * fput() the struct file we are about to overwrite in this case. | |
861 | * | |
862 | * It should never happen - if we allow dup2() do it, _really_ bad things | |
863 | * will follow. | |
864 | */ | |
865 | ||
fc9b52cd | 866 | void fd_install(unsigned int fd, struct file *file) |
1da177e4 LT |
867 | { |
868 | struct files_struct *files = current->files; | |
badf1662 | 869 | struct fdtable *fdt; |
1da177e4 | 870 | spin_lock(&files->file_lock); |
badf1662 | 871 | fdt = files_fdtable(files); |
ab2af1f5 DS |
872 | BUG_ON(fdt->fd[fd] != NULL); |
873 | rcu_assign_pointer(fdt->fd[fd], file); | |
1da177e4 LT |
874 | spin_unlock(&files->file_lock); |
875 | } | |
876 | ||
877 | EXPORT_SYMBOL(fd_install); | |
878 | ||
5590ff0d | 879 | long do_sys_open(int dfd, const char __user *filename, int flags, int mode) |
1da177e4 | 880 | { |
e922efc3 MS |
881 | char *tmp = getname(filename); |
882 | int fd = PTR_ERR(tmp); | |
1da177e4 | 883 | |
1da177e4 | 884 | if (!IS_ERR(tmp)) { |
f23513e8 | 885 | fd = get_unused_fd_flags(flags); |
1da177e4 | 886 | if (fd >= 0) { |
6e8341a1 | 887 | struct file *f = do_filp_open(dfd, tmp, flags, mode, 0); |
fed2fc18 TN |
888 | if (IS_ERR(f)) { |
889 | put_unused_fd(fd); | |
890 | fd = PTR_ERR(f); | |
891 | } else { | |
0f7fc9e4 | 892 | fsnotify_open(f->f_path.dentry); |
fed2fc18 TN |
893 | fd_install(fd, f); |
894 | } | |
1da177e4 | 895 | } |
1da177e4 LT |
896 | putname(tmp); |
897 | } | |
898 | return fd; | |
1da177e4 | 899 | } |
e922efc3 | 900 | |
ca013e94 | 901 | SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, int, mode) |
e922efc3 | 902 | { |
385910f2 LT |
903 | long ret; |
904 | ||
e922efc3 MS |
905 | if (force_o_largefile()) |
906 | flags |= O_LARGEFILE; | |
907 | ||
385910f2 LT |
908 | ret = do_sys_open(AT_FDCWD, filename, flags, mode); |
909 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 910 | asmlinkage_protect(3, ret, filename, flags, mode); |
385910f2 | 911 | return ret; |
e922efc3 | 912 | } |
1da177e4 | 913 | |
6559eed8 HC |
914 | SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, |
915 | int, mode) | |
5590ff0d | 916 | { |
385910f2 LT |
917 | long ret; |
918 | ||
5590ff0d UD |
919 | if (force_o_largefile()) |
920 | flags |= O_LARGEFILE; | |
921 | ||
385910f2 LT |
922 | ret = do_sys_open(dfd, filename, flags, mode); |
923 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 924 | asmlinkage_protect(4, ret, dfd, filename, flags, mode); |
385910f2 | 925 | return ret; |
5590ff0d | 926 | } |
5590ff0d | 927 | |
1da177e4 LT |
928 | #ifndef __alpha__ |
929 | ||
930 | /* | |
931 | * For backward compatibility? Maybe this should be moved | |
932 | * into arch/i386 instead? | |
933 | */ | |
002c8976 | 934 | SYSCALL_DEFINE2(creat, const char __user *, pathname, int, mode) |
1da177e4 LT |
935 | { |
936 | return sys_open(pathname, O_CREAT | O_WRONLY | O_TRUNC, mode); | |
937 | } | |
938 | ||
939 | #endif | |
940 | ||
941 | /* | |
942 | * "id" is the POSIX thread ID. We use the | |
943 | * files pointer for this.. | |
944 | */ | |
945 | int filp_close(struct file *filp, fl_owner_t id) | |
946 | { | |
45778ca8 | 947 | int retval = 0; |
1da177e4 LT |
948 | |
949 | if (!file_count(filp)) { | |
950 | printk(KERN_ERR "VFS: Close: file count is 0\n"); | |
45778ca8 | 951 | return 0; |
1da177e4 LT |
952 | } |
953 | ||
45778ca8 | 954 | if (filp->f_op && filp->f_op->flush) |
75e1fcc0 | 955 | retval = filp->f_op->flush(filp, id); |
1da177e4 LT |
956 | |
957 | dnotify_flush(filp, id); | |
958 | locks_remove_posix(filp, id); | |
959 | fput(filp); | |
960 | return retval; | |
961 | } | |
962 | ||
963 | EXPORT_SYMBOL(filp_close); | |
964 | ||
965 | /* | |
966 | * Careful here! We test whether the file pointer is NULL before | |
967 | * releasing the fd. This ensures that one clone task can't release | |
968 | * an fd while another clone is opening it. | |
969 | */ | |
ca013e94 | 970 | SYSCALL_DEFINE1(close, unsigned int, fd) |
1da177e4 LT |
971 | { |
972 | struct file * filp; | |
973 | struct files_struct *files = current->files; | |
badf1662 | 974 | struct fdtable *fdt; |
ee731f4f | 975 | int retval; |
1da177e4 LT |
976 | |
977 | spin_lock(&files->file_lock); | |
badf1662 DS |
978 | fdt = files_fdtable(files); |
979 | if (fd >= fdt->max_fds) | |
1da177e4 | 980 | goto out_unlock; |
badf1662 | 981 | filp = fdt->fd[fd]; |
1da177e4 LT |
982 | if (!filp) |
983 | goto out_unlock; | |
ab2af1f5 | 984 | rcu_assign_pointer(fdt->fd[fd], NULL); |
badf1662 | 985 | FD_CLR(fd, fdt->close_on_exec); |
1da177e4 LT |
986 | __put_unused_fd(files, fd); |
987 | spin_unlock(&files->file_lock); | |
ee731f4f EP |
988 | retval = filp_close(filp, files); |
989 | ||
990 | /* can't restart close syscall because file table entry was cleared */ | |
991 | if (unlikely(retval == -ERESTARTSYS || | |
992 | retval == -ERESTARTNOINTR || | |
993 | retval == -ERESTARTNOHAND || | |
994 | retval == -ERESTART_RESTARTBLOCK)) | |
995 | retval = -EINTR; | |
996 | ||
997 | return retval; | |
1da177e4 LT |
998 | |
999 | out_unlock: | |
1000 | spin_unlock(&files->file_lock); | |
1001 | return -EBADF; | |
1002 | } | |
1da177e4 LT |
1003 | EXPORT_SYMBOL(sys_close); |
1004 | ||
1005 | /* | |
1006 | * This routine simulates a hangup on the tty, to arrange that users | |
1007 | * are given clean terminals at login time. | |
1008 | */ | |
ca013e94 | 1009 | SYSCALL_DEFINE0(vhangup) |
1da177e4 LT |
1010 | { |
1011 | if (capable(CAP_SYS_TTY_CONFIG)) { | |
2cb5998b | 1012 | tty_vhangup_self(); |
1da177e4 LT |
1013 | return 0; |
1014 | } | |
1015 | return -EPERM; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * Called when an inode is about to be open. | |
1020 | * We use this to disallow opening large files on 32bit systems if | |
1021 | * the caller didn't specify O_LARGEFILE. On 64bit systems we force | |
1022 | * on this flag in sys_open. | |
1023 | */ | |
1024 | int generic_file_open(struct inode * inode, struct file * filp) | |
1025 | { | |
1026 | if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) | |
a9c62a18 | 1027 | return -EOVERFLOW; |
1da177e4 LT |
1028 | return 0; |
1029 | } | |
1030 | ||
1031 | EXPORT_SYMBOL(generic_file_open); | |
1032 | ||
1033 | /* | |
1034 | * This is used by subsystems that don't want seekable | |
1035 | * file descriptors | |
1036 | */ | |
1037 | int nonseekable_open(struct inode *inode, struct file *filp) | |
1038 | { | |
1039 | filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE); | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | EXPORT_SYMBOL(nonseekable_open); |