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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/stat.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | */ | |
7 | ||
630d9c47 | 8 | #include <linux/export.h> |
1da177e4 LT |
9 | #include <linux/mm.h> |
10 | #include <linux/errno.h> | |
11 | #include <linux/file.h> | |
1da177e4 LT |
12 | #include <linux/highuid.h> |
13 | #include <linux/fs.h> | |
14 | #include <linux/namei.h> | |
15 | #include <linux/security.h> | |
5b825c3a | 16 | #include <linux/cred.h> |
1da177e4 | 17 | #include <linux/syscalls.h> |
ba52de12 | 18 | #include <linux/pagemap.h> |
ac565de3 | 19 | #include <linux/compat.h> |
1da177e4 | 20 | |
7c0f6ba6 | 21 | #include <linux/uaccess.h> |
1da177e4 LT |
22 | #include <asm/unistd.h> |
23 | ||
a528d35e DH |
24 | /** |
25 | * generic_fillattr - Fill in the basic attributes from the inode struct | |
26 | * @inode: Inode to use as the source | |
27 | * @stat: Where to fill in the attributes | |
28 | * | |
29 | * Fill in the basic attributes in the kstat structure from data that's to be | |
30 | * found on the VFS inode structure. This is the default if no getattr inode | |
31 | * operation is supplied. | |
32 | */ | |
1da177e4 LT |
33 | void generic_fillattr(struct inode *inode, struct kstat *stat) |
34 | { | |
35 | stat->dev = inode->i_sb->s_dev; | |
36 | stat->ino = inode->i_ino; | |
37 | stat->mode = inode->i_mode; | |
38 | stat->nlink = inode->i_nlink; | |
39 | stat->uid = inode->i_uid; | |
40 | stat->gid = inode->i_gid; | |
41 | stat->rdev = inode->i_rdev; | |
3ddcd056 | 42 | stat->size = i_size_read(inode); |
1da177e4 LT |
43 | stat->atime = inode->i_atime; |
44 | stat->mtime = inode->i_mtime; | |
45 | stat->ctime = inode->i_ctime; | |
93407472 | 46 | stat->blksize = i_blocksize(inode); |
3ddcd056 | 47 | stat->blocks = inode->i_blocks; |
1da177e4 | 48 | |
a528d35e DH |
49 | if (IS_NOATIME(inode)) |
50 | stat->result_mask &= ~STATX_ATIME; | |
51 | if (IS_AUTOMOUNT(inode)) | |
52 | stat->attributes |= STATX_ATTR_AUTOMOUNT; | |
53 | } | |
1da177e4 LT |
54 | EXPORT_SYMBOL(generic_fillattr); |
55 | ||
b7a6ec52 BF |
56 | /** |
57 | * vfs_getattr_nosec - getattr without security checks | |
58 | * @path: file to get attributes from | |
59 | * @stat: structure to return attributes in | |
a528d35e DH |
60 | * @request_mask: STATX_xxx flags indicating what the caller wants |
61 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
b7a6ec52 BF |
62 | * |
63 | * Get attributes without calling security_inode_getattr. | |
64 | * | |
65 | * Currently the only caller other than vfs_getattr is internal to the | |
a528d35e DH |
66 | * filehandle lookup code, which uses only the inode number and returns no |
67 | * attributes to any user. Any other code probably wants vfs_getattr. | |
b7a6ec52 | 68 | */ |
a528d35e DH |
69 | int vfs_getattr_nosec(const struct path *path, struct kstat *stat, |
70 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 71 | { |
bb668734 | 72 | struct inode *inode = d_backing_inode(path->dentry); |
1da177e4 | 73 | |
a528d35e DH |
74 | memset(stat, 0, sizeof(*stat)); |
75 | stat->result_mask |= STATX_BASIC_STATS; | |
76 | request_mask &= STATX_ALL; | |
77 | query_flags &= KSTAT_QUERY_FLAGS; | |
1da177e4 | 78 | if (inode->i_op->getattr) |
a528d35e DH |
79 | return inode->i_op->getattr(path, stat, request_mask, |
80 | query_flags); | |
1da177e4 LT |
81 | |
82 | generic_fillattr(inode, stat); | |
1da177e4 LT |
83 | return 0; |
84 | } | |
b7a6ec52 BF |
85 | EXPORT_SYMBOL(vfs_getattr_nosec); |
86 | ||
a528d35e DH |
87 | /* |
88 | * vfs_getattr - Get the enhanced basic attributes of a file | |
89 | * @path: The file of interest | |
90 | * @stat: Where to return the statistics | |
91 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
92 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
93 | * | |
94 | * Ask the filesystem for a file's attributes. The caller must indicate in | |
95 | * request_mask and query_flags to indicate what they want. | |
96 | * | |
97 | * If the file is remote, the filesystem can be forced to update the attributes | |
98 | * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can | |
99 | * suppress the update by passing AT_STATX_DONT_SYNC. | |
100 | * | |
101 | * Bits must have been set in request_mask to indicate which attributes the | |
102 | * caller wants retrieving. Any such attribute not requested may be returned | |
103 | * anyway, but the value may be approximate, and, if remote, may not have been | |
104 | * synchronised with the server. | |
105 | * | |
106 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
107 | */ | |
108 | int vfs_getattr(const struct path *path, struct kstat *stat, | |
109 | u32 request_mask, unsigned int query_flags) | |
b7a6ec52 BF |
110 | { |
111 | int retval; | |
112 | ||
3f7036a0 | 113 | retval = security_inode_getattr(path); |
b7a6ec52 BF |
114 | if (retval) |
115 | return retval; | |
a528d35e | 116 | return vfs_getattr_nosec(path, stat, request_mask, query_flags); |
b7a6ec52 | 117 | } |
1da177e4 LT |
118 | EXPORT_SYMBOL(vfs_getattr); |
119 | ||
a528d35e DH |
120 | /** |
121 | * vfs_statx_fd - Get the enhanced basic attributes by file descriptor | |
122 | * @fd: The file descriptor referring to the file of interest | |
123 | * @stat: The result structure to fill in. | |
124 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
125 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
126 | * | |
127 | * This function is a wrapper around vfs_getattr(). The main difference is | |
128 | * that it uses a file descriptor to determine the file location. | |
129 | * | |
130 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
131 | */ | |
132 | int vfs_statx_fd(unsigned int fd, struct kstat *stat, | |
133 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 134 | { |
8c7493aa | 135 | struct fd f; |
1da177e4 LT |
136 | int error = -EBADF; |
137 | ||
8c7493aa EB |
138 | if (query_flags & ~KSTAT_QUERY_FLAGS) |
139 | return -EINVAL; | |
140 | ||
141 | f = fdget_raw(fd); | |
2903ff01 | 142 | if (f.file) { |
a528d35e DH |
143 | error = vfs_getattr(&f.file->f_path, stat, |
144 | request_mask, query_flags); | |
2903ff01 | 145 | fdput(f); |
1da177e4 LT |
146 | } |
147 | return error; | |
148 | } | |
a528d35e | 149 | EXPORT_SYMBOL(vfs_statx_fd); |
1da177e4 | 150 | |
a528d35e DH |
151 | /** |
152 | * vfs_statx - Get basic and extra attributes by filename | |
153 | * @dfd: A file descriptor representing the base dir for a relative filename | |
154 | * @filename: The name of the file of interest | |
155 | * @flags: Flags to control the query | |
156 | * @stat: The result structure to fill in. | |
157 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
158 | * | |
159 | * This function is a wrapper around vfs_getattr(). The main difference is | |
160 | * that it uses a filename and base directory to determine the file location. | |
161 | * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink | |
162 | * at the given name from being referenced. | |
163 | * | |
a528d35e DH |
164 | * 0 will be returned on success, and a -ve error code if unsuccessful. |
165 | */ | |
166 | int vfs_statx(int dfd, const char __user *filename, int flags, | |
167 | struct kstat *stat, u32 request_mask) | |
0112fc22 | 168 | { |
2eae7a18 | 169 | struct path path; |
0112fc22 | 170 | int error = -EINVAL; |
a528d35e | 171 | unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT; |
0112fc22 | 172 | |
a528d35e DH |
173 | if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | |
174 | AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0) | |
175 | return -EINVAL; | |
0112fc22 | 176 | |
a528d35e DH |
177 | if (flags & AT_SYMLINK_NOFOLLOW) |
178 | lookup_flags &= ~LOOKUP_FOLLOW; | |
179 | if (flags & AT_NO_AUTOMOUNT) | |
180 | lookup_flags &= ~LOOKUP_AUTOMOUNT; | |
181 | if (flags & AT_EMPTY_PATH) | |
65cfc672 | 182 | lookup_flags |= LOOKUP_EMPTY; |
a528d35e | 183 | |
836fb7e7 | 184 | retry: |
2eae7a18 CH |
185 | error = user_path_at(dfd, filename, lookup_flags, &path); |
186 | if (error) | |
187 | goto out; | |
188 | ||
a528d35e | 189 | error = vfs_getattr(&path, stat, request_mask, flags); |
2eae7a18 | 190 | path_put(&path); |
836fb7e7 JL |
191 | if (retry_estale(error, lookup_flags)) { |
192 | lookup_flags |= LOOKUP_REVAL; | |
193 | goto retry; | |
194 | } | |
0112fc22 OD |
195 | out: |
196 | return error; | |
197 | } | |
a528d35e | 198 | EXPORT_SYMBOL(vfs_statx); |
2eae7a18 | 199 | |
0112fc22 | 200 | |
1da177e4 LT |
201 | #ifdef __ARCH_WANT_OLD_STAT |
202 | ||
203 | /* | |
204 | * For backward compatibility? Maybe this should be moved | |
205 | * into arch/i386 instead? | |
206 | */ | |
207 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) | |
208 | { | |
209 | static int warncount = 5; | |
210 | struct __old_kernel_stat tmp; | |
a528d35e | 211 | |
1da177e4 LT |
212 | if (warncount > 0) { |
213 | warncount--; | |
214 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", | |
215 | current->comm); | |
216 | } else if (warncount < 0) { | |
217 | /* it's laughable, but... */ | |
218 | warncount = 0; | |
219 | } | |
220 | ||
221 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); | |
222 | tmp.st_dev = old_encode_dev(stat->dev); | |
223 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
224 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
225 | return -EOVERFLOW; | |
1da177e4 LT |
226 | tmp.st_mode = stat->mode; |
227 | tmp.st_nlink = stat->nlink; | |
228 | if (tmp.st_nlink != stat->nlink) | |
229 | return -EOVERFLOW; | |
a7c1938e EB |
230 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
231 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
1da177e4 LT |
232 | tmp.st_rdev = old_encode_dev(stat->rdev); |
233 | #if BITS_PER_LONG == 32 | |
234 | if (stat->size > MAX_NON_LFS) | |
235 | return -EOVERFLOW; | |
a528d35e | 236 | #endif |
1da177e4 LT |
237 | tmp.st_size = stat->size; |
238 | tmp.st_atime = stat->atime.tv_sec; | |
239 | tmp.st_mtime = stat->mtime.tv_sec; | |
240 | tmp.st_ctime = stat->ctime.tv_sec; | |
241 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
242 | } | |
243 | ||
c7887325 DH |
244 | SYSCALL_DEFINE2(stat, const char __user *, filename, |
245 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
246 | { |
247 | struct kstat stat; | |
2eae7a18 | 248 | int error; |
1da177e4 | 249 | |
2eae7a18 CH |
250 | error = vfs_stat(filename, &stat); |
251 | if (error) | |
252 | return error; | |
1da177e4 | 253 | |
2eae7a18 | 254 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 255 | } |
257ac264 | 256 | |
c7887325 DH |
257 | SYSCALL_DEFINE2(lstat, const char __user *, filename, |
258 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
259 | { |
260 | struct kstat stat; | |
2eae7a18 | 261 | int error; |
1da177e4 | 262 | |
2eae7a18 CH |
263 | error = vfs_lstat(filename, &stat); |
264 | if (error) | |
265 | return error; | |
1da177e4 | 266 | |
2eae7a18 | 267 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 268 | } |
257ac264 HC |
269 | |
270 | SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
271 | { |
272 | struct kstat stat; | |
273 | int error = vfs_fstat(fd, &stat); | |
274 | ||
275 | if (!error) | |
276 | error = cp_old_stat(&stat, statbuf); | |
277 | ||
278 | return error; | |
279 | } | |
280 | ||
281 | #endif /* __ARCH_WANT_OLD_STAT */ | |
282 | ||
a52dd971 LT |
283 | #if BITS_PER_LONG == 32 |
284 | # define choose_32_64(a,b) a | |
285 | #else | |
286 | # define choose_32_64(a,b) b | |
287 | #endif | |
288 | ||
4c416f42 | 289 | #define valid_dev(x) choose_32_64(old_valid_dev(x),true) |
a52dd971 LT |
290 | #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) |
291 | ||
8529f613 LT |
292 | #ifndef INIT_STRUCT_STAT_PADDING |
293 | # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) | |
294 | #endif | |
295 | ||
1da177e4 LT |
296 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
297 | { | |
298 | struct stat tmp; | |
299 | ||
a52dd971 | 300 | if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) |
1da177e4 | 301 | return -EOVERFLOW; |
a52dd971 LT |
302 | #if BITS_PER_LONG == 32 |
303 | if (stat->size > MAX_NON_LFS) | |
1da177e4 LT |
304 | return -EOVERFLOW; |
305 | #endif | |
306 | ||
8529f613 | 307 | INIT_STRUCT_STAT_PADDING(tmp); |
a52dd971 | 308 | tmp.st_dev = encode_dev(stat->dev); |
1da177e4 | 309 | tmp.st_ino = stat->ino; |
afefdbb2 DH |
310 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
311 | return -EOVERFLOW; | |
1da177e4 LT |
312 | tmp.st_mode = stat->mode; |
313 | tmp.st_nlink = stat->nlink; | |
314 | if (tmp.st_nlink != stat->nlink) | |
315 | return -EOVERFLOW; | |
a7c1938e EB |
316 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
317 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
a52dd971 | 318 | tmp.st_rdev = encode_dev(stat->rdev); |
1da177e4 LT |
319 | tmp.st_size = stat->size; |
320 | tmp.st_atime = stat->atime.tv_sec; | |
321 | tmp.st_mtime = stat->mtime.tv_sec; | |
322 | tmp.st_ctime = stat->ctime.tv_sec; | |
323 | #ifdef STAT_HAVE_NSEC | |
324 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
325 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
326 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
327 | #endif | |
328 | tmp.st_blocks = stat->blocks; | |
329 | tmp.st_blksize = stat->blksize; | |
330 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
331 | } | |
332 | ||
c7887325 DH |
333 | SYSCALL_DEFINE2(newstat, const char __user *, filename, |
334 | struct stat __user *, statbuf) | |
5590ff0d UD |
335 | { |
336 | struct kstat stat; | |
2eae7a18 | 337 | int error = vfs_stat(filename, &stat); |
5590ff0d | 338 | |
2eae7a18 CH |
339 | if (error) |
340 | return error; | |
341 | return cp_new_stat(&stat, statbuf); | |
5590ff0d UD |
342 | } |
343 | ||
c7887325 DH |
344 | SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
345 | struct stat __user *, statbuf) | |
1da177e4 LT |
346 | { |
347 | struct kstat stat; | |
2eae7a18 | 348 | int error; |
1da177e4 | 349 | |
2eae7a18 CH |
350 | error = vfs_lstat(filename, &stat); |
351 | if (error) | |
352 | return error; | |
1da177e4 | 353 | |
2eae7a18 | 354 | return cp_new_stat(&stat, statbuf); |
1da177e4 | 355 | } |
5590ff0d | 356 | |
2833c28a | 357 | #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
c7887325 | 358 | SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
6559eed8 | 359 | struct stat __user *, statbuf, int, flag) |
1da177e4 LT |
360 | { |
361 | struct kstat stat; | |
0112fc22 | 362 | int error; |
1da177e4 | 363 | |
0112fc22 OD |
364 | error = vfs_fstatat(dfd, filename, &stat, flag); |
365 | if (error) | |
366 | return error; | |
367 | return cp_new_stat(&stat, statbuf); | |
1da177e4 | 368 | } |
cff2b760 | 369 | #endif |
5590ff0d | 370 | |
257ac264 | 371 | SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
1da177e4 LT |
372 | { |
373 | struct kstat stat; | |
374 | int error = vfs_fstat(fd, &stat); | |
375 | ||
376 | if (!error) | |
377 | error = cp_new_stat(&stat, statbuf); | |
378 | ||
379 | return error; | |
380 | } | |
381 | ||
6559eed8 HC |
382 | SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
383 | char __user *, buf, int, bufsiz) | |
1da177e4 | 384 | { |
2d8f3038 | 385 | struct path path; |
1da177e4 | 386 | int error; |
1fa1e7f6 | 387 | int empty = 0; |
7955119e | 388 | unsigned int lookup_flags = LOOKUP_EMPTY; |
1da177e4 LT |
389 | |
390 | if (bufsiz <= 0) | |
391 | return -EINVAL; | |
392 | ||
7955119e JL |
393 | retry: |
394 | error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); | |
1da177e4 | 395 | if (!error) { |
bb668734 | 396 | struct inode *inode = d_backing_inode(path.dentry); |
1da177e4 | 397 | |
1fa1e7f6 | 398 | error = empty ? -ENOENT : -EINVAL; |
fd4a0edf MS |
399 | /* |
400 | * AFS mountpoints allow readlink(2) but are not symlinks | |
401 | */ | |
402 | if (d_is_symlink(path.dentry) || inode->i_op->readlink) { | |
2d8f3038 | 403 | error = security_inode_readlink(path.dentry); |
1da177e4 | 404 | if (!error) { |
68ac1234 | 405 | touch_atime(&path); |
fd4a0edf | 406 | error = vfs_readlink(path.dentry, buf, bufsiz); |
1da177e4 LT |
407 | } |
408 | } | |
2d8f3038 | 409 | path_put(&path); |
7955119e JL |
410 | if (retry_estale(error, lookup_flags)) { |
411 | lookup_flags |= LOOKUP_REVAL; | |
412 | goto retry; | |
413 | } | |
1da177e4 LT |
414 | } |
415 | return error; | |
416 | } | |
417 | ||
002c8976 HC |
418 | SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
419 | int, bufsiz) | |
5590ff0d UD |
420 | { |
421 | return sys_readlinkat(AT_FDCWD, path, buf, bufsiz); | |
422 | } | |
423 | ||
1da177e4 LT |
424 | |
425 | /* ---------- LFS-64 ----------- */ | |
0753f70f | 426 | #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
1da177e4 | 427 | |
8529f613 LT |
428 | #ifndef INIT_STRUCT_STAT64_PADDING |
429 | # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) | |
430 | #endif | |
431 | ||
1da177e4 LT |
432 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
433 | { | |
434 | struct stat64 tmp; | |
435 | ||
8529f613 | 436 | INIT_STRUCT_STAT64_PADDING(tmp); |
1da177e4 LT |
437 | #ifdef CONFIG_MIPS |
438 | /* mips has weird padding, so we don't get 64 bits there */ | |
1da177e4 LT |
439 | tmp.st_dev = new_encode_dev(stat->dev); |
440 | tmp.st_rdev = new_encode_dev(stat->rdev); | |
441 | #else | |
442 | tmp.st_dev = huge_encode_dev(stat->dev); | |
443 | tmp.st_rdev = huge_encode_dev(stat->rdev); | |
444 | #endif | |
445 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
446 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
447 | return -EOVERFLOW; | |
1da177e4 LT |
448 | #ifdef STAT64_HAS_BROKEN_ST_INO |
449 | tmp.__st_ino = stat->ino; | |
450 | #endif | |
451 | tmp.st_mode = stat->mode; | |
452 | tmp.st_nlink = stat->nlink; | |
a7c1938e EB |
453 | tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
454 | tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
1da177e4 LT |
455 | tmp.st_atime = stat->atime.tv_sec; |
456 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
457 | tmp.st_mtime = stat->mtime.tv_sec; | |
458 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
459 | tmp.st_ctime = stat->ctime.tv_sec; | |
460 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
461 | tmp.st_size = stat->size; | |
462 | tmp.st_blocks = stat->blocks; | |
463 | tmp.st_blksize = stat->blksize; | |
464 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
465 | } | |
466 | ||
c7887325 DH |
467 | SYSCALL_DEFINE2(stat64, const char __user *, filename, |
468 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
469 | { |
470 | struct kstat stat; | |
471 | int error = vfs_stat(filename, &stat); | |
472 | ||
473 | if (!error) | |
474 | error = cp_new_stat64(&stat, statbuf); | |
475 | ||
476 | return error; | |
477 | } | |
257ac264 | 478 | |
c7887325 DH |
479 | SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
480 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
481 | { |
482 | struct kstat stat; | |
483 | int error = vfs_lstat(filename, &stat); | |
484 | ||
485 | if (!error) | |
486 | error = cp_new_stat64(&stat, statbuf); | |
487 | ||
488 | return error; | |
489 | } | |
257ac264 HC |
490 | |
491 | SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) | |
1da177e4 LT |
492 | { |
493 | struct kstat stat; | |
494 | int error = vfs_fstat(fd, &stat); | |
495 | ||
496 | if (!error) | |
497 | error = cp_new_stat64(&stat, statbuf); | |
498 | ||
499 | return error; | |
500 | } | |
501 | ||
c7887325 | 502 | SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
6559eed8 | 503 | struct stat64 __user *, statbuf, int, flag) |
cff2b760 UD |
504 | { |
505 | struct kstat stat; | |
0112fc22 | 506 | int error; |
cff2b760 | 507 | |
0112fc22 OD |
508 | error = vfs_fstatat(dfd, filename, &stat, flag); |
509 | if (error) | |
510 | return error; | |
511 | return cp_new_stat64(&stat, statbuf); | |
cff2b760 | 512 | } |
0753f70f | 513 | #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
1da177e4 | 514 | |
64bd7204 EB |
515 | static noinline_for_stack int |
516 | cp_statx(const struct kstat *stat, struct statx __user *buffer) | |
a528d35e | 517 | { |
64bd7204 EB |
518 | struct statx tmp; |
519 | ||
520 | memset(&tmp, 0, sizeof(tmp)); | |
521 | ||
522 | tmp.stx_mask = stat->result_mask; | |
523 | tmp.stx_blksize = stat->blksize; | |
524 | tmp.stx_attributes = stat->attributes; | |
525 | tmp.stx_nlink = stat->nlink; | |
526 | tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid); | |
527 | tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
528 | tmp.stx_mode = stat->mode; | |
529 | tmp.stx_ino = stat->ino; | |
530 | tmp.stx_size = stat->size; | |
531 | tmp.stx_blocks = stat->blocks; | |
3209f68b | 532 | tmp.stx_attributes_mask = stat->attributes_mask; |
64bd7204 EB |
533 | tmp.stx_atime.tv_sec = stat->atime.tv_sec; |
534 | tmp.stx_atime.tv_nsec = stat->atime.tv_nsec; | |
535 | tmp.stx_btime.tv_sec = stat->btime.tv_sec; | |
536 | tmp.stx_btime.tv_nsec = stat->btime.tv_nsec; | |
537 | tmp.stx_ctime.tv_sec = stat->ctime.tv_sec; | |
538 | tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec; | |
539 | tmp.stx_mtime.tv_sec = stat->mtime.tv_sec; | |
540 | tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec; | |
541 | tmp.stx_rdev_major = MAJOR(stat->rdev); | |
542 | tmp.stx_rdev_minor = MINOR(stat->rdev); | |
543 | tmp.stx_dev_major = MAJOR(stat->dev); | |
544 | tmp.stx_dev_minor = MINOR(stat->dev); | |
545 | ||
546 | return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
a528d35e DH |
547 | } |
548 | ||
549 | /** | |
550 | * sys_statx - System call to get enhanced stats | |
551 | * @dfd: Base directory to pathwalk from *or* fd to stat. | |
1e2f82d1 | 552 | * @filename: File to stat or "" with AT_EMPTY_PATH |
a528d35e DH |
553 | * @flags: AT_* flags to control pathwalk. |
554 | * @mask: Parts of statx struct actually required. | |
555 | * @buffer: Result buffer. | |
556 | * | |
1e2f82d1 DH |
557 | * Note that fstat() can be emulated by setting dfd to the fd of interest, |
558 | * supplying "" as the filename and setting AT_EMPTY_PATH in the flags. | |
a528d35e DH |
559 | */ |
560 | SYSCALL_DEFINE5(statx, | |
561 | int, dfd, const char __user *, filename, unsigned, flags, | |
562 | unsigned int, mask, | |
563 | struct statx __user *, buffer) | |
564 | { | |
565 | struct kstat stat; | |
566 | int error; | |
567 | ||
47071aee DH |
568 | if (mask & STATX__RESERVED) |
569 | return -EINVAL; | |
a528d35e DH |
570 | if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) |
571 | return -EINVAL; | |
a528d35e | 572 | |
1e2f82d1 | 573 | error = vfs_statx(dfd, filename, flags, &stat, mask); |
a528d35e DH |
574 | if (error) |
575 | return error; | |
64bd7204 EB |
576 | |
577 | return cp_statx(&stat, buffer); | |
a528d35e DH |
578 | } |
579 | ||
ac565de3 AV |
580 | #ifdef CONFIG_COMPAT |
581 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) | |
582 | { | |
583 | struct compat_stat tmp; | |
584 | ||
585 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) | |
586 | return -EOVERFLOW; | |
587 | ||
588 | memset(&tmp, 0, sizeof(tmp)); | |
589 | tmp.st_dev = old_encode_dev(stat->dev); | |
590 | tmp.st_ino = stat->ino; | |
591 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) | |
592 | return -EOVERFLOW; | |
593 | tmp.st_mode = stat->mode; | |
594 | tmp.st_nlink = stat->nlink; | |
595 | if (tmp.st_nlink != stat->nlink) | |
596 | return -EOVERFLOW; | |
597 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); | |
598 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
599 | tmp.st_rdev = old_encode_dev(stat->rdev); | |
600 | if ((u64) stat->size > MAX_NON_LFS) | |
601 | return -EOVERFLOW; | |
602 | tmp.st_size = stat->size; | |
603 | tmp.st_atime = stat->atime.tv_sec; | |
604 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
605 | tmp.st_mtime = stat->mtime.tv_sec; | |
606 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
607 | tmp.st_ctime = stat->ctime.tv_sec; | |
608 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
609 | tmp.st_blocks = stat->blocks; | |
610 | tmp.st_blksize = stat->blksize; | |
611 | return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
612 | } | |
613 | ||
614 | COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, | |
615 | struct compat_stat __user *, statbuf) | |
616 | { | |
617 | struct kstat stat; | |
618 | int error; | |
619 | ||
620 | error = vfs_stat(filename, &stat); | |
621 | if (error) | |
622 | return error; | |
623 | return cp_compat_stat(&stat, statbuf); | |
624 | } | |
625 | ||
626 | COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, | |
627 | struct compat_stat __user *, statbuf) | |
628 | { | |
629 | struct kstat stat; | |
630 | int error; | |
631 | ||
632 | error = vfs_lstat(filename, &stat); | |
633 | if (error) | |
634 | return error; | |
635 | return cp_compat_stat(&stat, statbuf); | |
636 | } | |
637 | ||
638 | #ifndef __ARCH_WANT_STAT64 | |
639 | COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, | |
640 | const char __user *, filename, | |
641 | struct compat_stat __user *, statbuf, int, flag) | |
642 | { | |
643 | struct kstat stat; | |
644 | int error; | |
645 | ||
646 | error = vfs_fstatat(dfd, filename, &stat, flag); | |
647 | if (error) | |
648 | return error; | |
649 | return cp_compat_stat(&stat, statbuf); | |
650 | } | |
651 | #endif | |
652 | ||
653 | COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, | |
654 | struct compat_stat __user *, statbuf) | |
655 | { | |
656 | struct kstat stat; | |
657 | int error = vfs_fstat(fd, &stat); | |
658 | ||
659 | if (!error) | |
660 | error = cp_compat_stat(&stat, statbuf); | |
661 | return error; | |
662 | } | |
663 | #endif | |
664 | ||
b462707e DM |
665 | /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
666 | void __inode_add_bytes(struct inode *inode, loff_t bytes) | |
1da177e4 | 667 | { |
1da177e4 LT |
668 | inode->i_blocks += bytes >> 9; |
669 | bytes &= 511; | |
670 | inode->i_bytes += bytes; | |
671 | if (inode->i_bytes >= 512) { | |
672 | inode->i_blocks++; | |
673 | inode->i_bytes -= 512; | |
674 | } | |
b462707e | 675 | } |
eb315d2a | 676 | EXPORT_SYMBOL(__inode_add_bytes); |
b462707e DM |
677 | |
678 | void inode_add_bytes(struct inode *inode, loff_t bytes) | |
679 | { | |
680 | spin_lock(&inode->i_lock); | |
681 | __inode_add_bytes(inode, bytes); | |
1da177e4 LT |
682 | spin_unlock(&inode->i_lock); |
683 | } | |
684 | ||
685 | EXPORT_SYMBOL(inode_add_bytes); | |
686 | ||
1c8924eb | 687 | void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
1da177e4 | 688 | { |
1da177e4 LT |
689 | inode->i_blocks -= bytes >> 9; |
690 | bytes &= 511; | |
691 | if (inode->i_bytes < bytes) { | |
692 | inode->i_blocks--; | |
693 | inode->i_bytes += 512; | |
694 | } | |
695 | inode->i_bytes -= bytes; | |
1c8924eb JK |
696 | } |
697 | ||
698 | EXPORT_SYMBOL(__inode_sub_bytes); | |
699 | ||
700 | void inode_sub_bytes(struct inode *inode, loff_t bytes) | |
701 | { | |
702 | spin_lock(&inode->i_lock); | |
703 | __inode_sub_bytes(inode, bytes); | |
1da177e4 LT |
704 | spin_unlock(&inode->i_lock); |
705 | } | |
706 | ||
707 | EXPORT_SYMBOL(inode_sub_bytes); | |
708 | ||
709 | loff_t inode_get_bytes(struct inode *inode) | |
710 | { | |
711 | loff_t ret; | |
712 | ||
713 | spin_lock(&inode->i_lock); | |
f4a8116a | 714 | ret = __inode_get_bytes(inode); |
1da177e4 LT |
715 | spin_unlock(&inode->i_lock); |
716 | return ret; | |
717 | } | |
718 | ||
719 | EXPORT_SYMBOL(inode_get_bytes); | |
720 | ||
721 | void inode_set_bytes(struct inode *inode, loff_t bytes) | |
722 | { | |
723 | /* Caller is here responsible for sufficient locking | |
724 | * (ie. inode->i_lock) */ | |
725 | inode->i_blocks = bytes >> 9; | |
726 | inode->i_bytes = bytes & 511; | |
727 | } | |
728 | ||
729 | EXPORT_SYMBOL(inode_set_bytes); |