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