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> |
1da177e4 | 18 | |
7c0f6ba6 | 19 | #include <linux/uaccess.h> |
1da177e4 LT |
20 | #include <asm/unistd.h> |
21 | ||
a528d35e DH |
22 | /** |
23 | * generic_fillattr - Fill in the basic attributes from the inode struct | |
24 | * @inode: Inode to use as the source | |
25 | * @stat: Where to fill in the attributes | |
26 | * | |
27 | * Fill in the basic attributes in the kstat structure from data that's to be | |
28 | * found on the VFS inode structure. This is the default if no getattr inode | |
29 | * operation is supplied. | |
30 | */ | |
1da177e4 LT |
31 | void generic_fillattr(struct inode *inode, struct kstat *stat) |
32 | { | |
33 | stat->dev = inode->i_sb->s_dev; | |
34 | stat->ino = inode->i_ino; | |
35 | stat->mode = inode->i_mode; | |
36 | stat->nlink = inode->i_nlink; | |
37 | stat->uid = inode->i_uid; | |
38 | stat->gid = inode->i_gid; | |
39 | stat->rdev = inode->i_rdev; | |
3ddcd056 | 40 | stat->size = i_size_read(inode); |
1da177e4 LT |
41 | stat->atime = inode->i_atime; |
42 | stat->mtime = inode->i_mtime; | |
43 | stat->ctime = inode->i_ctime; | |
93407472 | 44 | stat->blksize = i_blocksize(inode); |
3ddcd056 | 45 | stat->blocks = inode->i_blocks; |
1da177e4 | 46 | |
a528d35e DH |
47 | if (IS_NOATIME(inode)) |
48 | stat->result_mask &= ~STATX_ATIME; | |
49 | if (IS_AUTOMOUNT(inode)) | |
50 | stat->attributes |= STATX_ATTR_AUTOMOUNT; | |
51 | } | |
1da177e4 LT |
52 | EXPORT_SYMBOL(generic_fillattr); |
53 | ||
b7a6ec52 BF |
54 | /** |
55 | * vfs_getattr_nosec - getattr without security checks | |
56 | * @path: file to get attributes from | |
57 | * @stat: structure to return attributes in | |
a528d35e DH |
58 | * @request_mask: STATX_xxx flags indicating what the caller wants |
59 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
b7a6ec52 BF |
60 | * |
61 | * Get attributes without calling security_inode_getattr. | |
62 | * | |
63 | * Currently the only caller other than vfs_getattr is internal to the | |
a528d35e DH |
64 | * filehandle lookup code, which uses only the inode number and returns no |
65 | * attributes to any user. Any other code probably wants vfs_getattr. | |
b7a6ec52 | 66 | */ |
a528d35e DH |
67 | int vfs_getattr_nosec(const struct path *path, struct kstat *stat, |
68 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 69 | { |
bb668734 | 70 | struct inode *inode = d_backing_inode(path->dentry); |
1da177e4 | 71 | |
a528d35e DH |
72 | memset(stat, 0, sizeof(*stat)); |
73 | stat->result_mask |= STATX_BASIC_STATS; | |
74 | request_mask &= STATX_ALL; | |
75 | query_flags &= KSTAT_QUERY_FLAGS; | |
1da177e4 | 76 | if (inode->i_op->getattr) |
a528d35e DH |
77 | return inode->i_op->getattr(path, stat, request_mask, |
78 | query_flags); | |
1da177e4 LT |
79 | |
80 | generic_fillattr(inode, stat); | |
1da177e4 LT |
81 | return 0; |
82 | } | |
b7a6ec52 BF |
83 | EXPORT_SYMBOL(vfs_getattr_nosec); |
84 | ||
a528d35e DH |
85 | /* |
86 | * vfs_getattr - Get the enhanced basic attributes of a file | |
87 | * @path: The file of interest | |
88 | * @stat: Where to return the statistics | |
89 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
90 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
91 | * | |
92 | * Ask the filesystem for a file's attributes. The caller must indicate in | |
93 | * request_mask and query_flags to indicate what they want. | |
94 | * | |
95 | * If the file is remote, the filesystem can be forced to update the attributes | |
96 | * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can | |
97 | * suppress the update by passing AT_STATX_DONT_SYNC. | |
98 | * | |
99 | * Bits must have been set in request_mask to indicate which attributes the | |
100 | * caller wants retrieving. Any such attribute not requested may be returned | |
101 | * anyway, but the value may be approximate, and, if remote, may not have been | |
102 | * synchronised with the server. | |
103 | * | |
104 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
105 | */ | |
106 | int vfs_getattr(const struct path *path, struct kstat *stat, | |
107 | u32 request_mask, unsigned int query_flags) | |
b7a6ec52 BF |
108 | { |
109 | int retval; | |
110 | ||
3f7036a0 | 111 | retval = security_inode_getattr(path); |
b7a6ec52 BF |
112 | if (retval) |
113 | return retval; | |
a528d35e | 114 | return vfs_getattr_nosec(path, stat, request_mask, query_flags); |
b7a6ec52 | 115 | } |
1da177e4 LT |
116 | EXPORT_SYMBOL(vfs_getattr); |
117 | ||
a528d35e DH |
118 | /** |
119 | * vfs_statx_fd - Get the enhanced basic attributes by file descriptor | |
120 | * @fd: The file descriptor referring to the file of interest | |
121 | * @stat: The result structure to fill in. | |
122 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
123 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
124 | * | |
125 | * This function is a wrapper around vfs_getattr(). The main difference is | |
126 | * that it uses a file descriptor to determine the file location. | |
127 | * | |
128 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
129 | */ | |
130 | int vfs_statx_fd(unsigned int fd, struct kstat *stat, | |
131 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 132 | { |
8c7493aa | 133 | struct fd f; |
1da177e4 LT |
134 | int error = -EBADF; |
135 | ||
8c7493aa EB |
136 | if (query_flags & ~KSTAT_QUERY_FLAGS) |
137 | return -EINVAL; | |
138 | ||
139 | f = fdget_raw(fd); | |
2903ff01 | 140 | if (f.file) { |
a528d35e DH |
141 | error = vfs_getattr(&f.file->f_path, stat, |
142 | request_mask, query_flags); | |
2903ff01 | 143 | fdput(f); |
1da177e4 LT |
144 | } |
145 | return error; | |
146 | } | |
a528d35e | 147 | EXPORT_SYMBOL(vfs_statx_fd); |
1da177e4 | 148 | |
a528d35e DH |
149 | /** |
150 | * vfs_statx - Get basic and extra attributes by filename | |
151 | * @dfd: A file descriptor representing the base dir for a relative filename | |
152 | * @filename: The name of the file of interest | |
153 | * @flags: Flags to control the query | |
154 | * @stat: The result structure to fill in. | |
155 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
156 | * | |
157 | * This function is a wrapper around vfs_getattr(). The main difference is | |
158 | * that it uses a filename and base directory to determine the file location. | |
159 | * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink | |
160 | * at the given name from being referenced. | |
161 | * | |
a528d35e DH |
162 | * 0 will be returned on success, and a -ve error code if unsuccessful. |
163 | */ | |
164 | int vfs_statx(int dfd, const char __user *filename, int flags, | |
165 | struct kstat *stat, u32 request_mask) | |
0112fc22 | 166 | { |
2eae7a18 | 167 | struct path path; |
0112fc22 | 168 | int error = -EINVAL; |
a528d35e | 169 | unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT; |
0112fc22 | 170 | |
a528d35e DH |
171 | if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | |
172 | AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0) | |
173 | return -EINVAL; | |
0112fc22 | 174 | |
a528d35e DH |
175 | if (flags & AT_SYMLINK_NOFOLLOW) |
176 | lookup_flags &= ~LOOKUP_FOLLOW; | |
177 | if (flags & AT_NO_AUTOMOUNT) | |
178 | lookup_flags &= ~LOOKUP_AUTOMOUNT; | |
179 | if (flags & AT_EMPTY_PATH) | |
65cfc672 | 180 | lookup_flags |= LOOKUP_EMPTY; |
a528d35e | 181 | |
836fb7e7 | 182 | retry: |
2eae7a18 CH |
183 | error = user_path_at(dfd, filename, lookup_flags, &path); |
184 | if (error) | |
185 | goto out; | |
186 | ||
a528d35e | 187 | error = vfs_getattr(&path, stat, request_mask, flags); |
2eae7a18 | 188 | path_put(&path); |
836fb7e7 JL |
189 | if (retry_estale(error, lookup_flags)) { |
190 | lookup_flags |= LOOKUP_REVAL; | |
191 | goto retry; | |
192 | } | |
0112fc22 OD |
193 | out: |
194 | return error; | |
195 | } | |
a528d35e | 196 | EXPORT_SYMBOL(vfs_statx); |
2eae7a18 | 197 | |
0112fc22 | 198 | |
1da177e4 LT |
199 | #ifdef __ARCH_WANT_OLD_STAT |
200 | ||
201 | /* | |
202 | * For backward compatibility? Maybe this should be moved | |
203 | * into arch/i386 instead? | |
204 | */ | |
205 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) | |
206 | { | |
207 | static int warncount = 5; | |
208 | struct __old_kernel_stat tmp; | |
a528d35e | 209 | |
1da177e4 LT |
210 | if (warncount > 0) { |
211 | warncount--; | |
212 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", | |
213 | current->comm); | |
214 | } else if (warncount < 0) { | |
215 | /* it's laughable, but... */ | |
216 | warncount = 0; | |
217 | } | |
218 | ||
219 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); | |
220 | tmp.st_dev = old_encode_dev(stat->dev); | |
221 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
222 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
223 | return -EOVERFLOW; | |
1da177e4 LT |
224 | tmp.st_mode = stat->mode; |
225 | tmp.st_nlink = stat->nlink; | |
226 | if (tmp.st_nlink != stat->nlink) | |
227 | return -EOVERFLOW; | |
a7c1938e EB |
228 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
229 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
1da177e4 LT |
230 | tmp.st_rdev = old_encode_dev(stat->rdev); |
231 | #if BITS_PER_LONG == 32 | |
232 | if (stat->size > MAX_NON_LFS) | |
233 | return -EOVERFLOW; | |
a528d35e | 234 | #endif |
1da177e4 LT |
235 | tmp.st_size = stat->size; |
236 | tmp.st_atime = stat->atime.tv_sec; | |
237 | tmp.st_mtime = stat->mtime.tv_sec; | |
238 | tmp.st_ctime = stat->ctime.tv_sec; | |
239 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
240 | } | |
241 | ||
c7887325 DH |
242 | SYSCALL_DEFINE2(stat, const char __user *, filename, |
243 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
244 | { |
245 | struct kstat stat; | |
2eae7a18 | 246 | int error; |
1da177e4 | 247 | |
2eae7a18 CH |
248 | error = vfs_stat(filename, &stat); |
249 | if (error) | |
250 | return error; | |
1da177e4 | 251 | |
2eae7a18 | 252 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 253 | } |
257ac264 | 254 | |
c7887325 DH |
255 | SYSCALL_DEFINE2(lstat, const char __user *, filename, |
256 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
257 | { |
258 | struct kstat stat; | |
2eae7a18 | 259 | int error; |
1da177e4 | 260 | |
2eae7a18 CH |
261 | error = vfs_lstat(filename, &stat); |
262 | if (error) | |
263 | return error; | |
1da177e4 | 264 | |
2eae7a18 | 265 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 266 | } |
257ac264 HC |
267 | |
268 | SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
269 | { |
270 | struct kstat stat; | |
271 | int error = vfs_fstat(fd, &stat); | |
272 | ||
273 | if (!error) | |
274 | error = cp_old_stat(&stat, statbuf); | |
275 | ||
276 | return error; | |
277 | } | |
278 | ||
279 | #endif /* __ARCH_WANT_OLD_STAT */ | |
280 | ||
a52dd971 LT |
281 | #if BITS_PER_LONG == 32 |
282 | # define choose_32_64(a,b) a | |
283 | #else | |
284 | # define choose_32_64(a,b) b | |
285 | #endif | |
286 | ||
4c416f42 | 287 | #define valid_dev(x) choose_32_64(old_valid_dev(x),true) |
a52dd971 LT |
288 | #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) |
289 | ||
8529f613 LT |
290 | #ifndef INIT_STRUCT_STAT_PADDING |
291 | # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) | |
292 | #endif | |
293 | ||
1da177e4 LT |
294 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
295 | { | |
296 | struct stat tmp; | |
297 | ||
a52dd971 | 298 | if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) |
1da177e4 | 299 | return -EOVERFLOW; |
a52dd971 LT |
300 | #if BITS_PER_LONG == 32 |
301 | if (stat->size > MAX_NON_LFS) | |
1da177e4 LT |
302 | return -EOVERFLOW; |
303 | #endif | |
304 | ||
8529f613 | 305 | INIT_STRUCT_STAT_PADDING(tmp); |
a52dd971 | 306 | tmp.st_dev = encode_dev(stat->dev); |
1da177e4 | 307 | tmp.st_ino = stat->ino; |
afefdbb2 DH |
308 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
309 | return -EOVERFLOW; | |
1da177e4 LT |
310 | tmp.st_mode = stat->mode; |
311 | tmp.st_nlink = stat->nlink; | |
312 | if (tmp.st_nlink != stat->nlink) | |
313 | return -EOVERFLOW; | |
a7c1938e EB |
314 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
315 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
a52dd971 | 316 | tmp.st_rdev = encode_dev(stat->rdev); |
1da177e4 LT |
317 | tmp.st_size = stat->size; |
318 | tmp.st_atime = stat->atime.tv_sec; | |
319 | tmp.st_mtime = stat->mtime.tv_sec; | |
320 | tmp.st_ctime = stat->ctime.tv_sec; | |
321 | #ifdef STAT_HAVE_NSEC | |
322 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
323 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
324 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
325 | #endif | |
326 | tmp.st_blocks = stat->blocks; | |
327 | tmp.st_blksize = stat->blksize; | |
328 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
329 | } | |
330 | ||
c7887325 DH |
331 | SYSCALL_DEFINE2(newstat, const char __user *, filename, |
332 | struct stat __user *, statbuf) | |
5590ff0d UD |
333 | { |
334 | struct kstat stat; | |
2eae7a18 | 335 | int error = vfs_stat(filename, &stat); |
5590ff0d | 336 | |
2eae7a18 CH |
337 | if (error) |
338 | return error; | |
339 | return cp_new_stat(&stat, statbuf); | |
5590ff0d UD |
340 | } |
341 | ||
c7887325 DH |
342 | SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
343 | struct stat __user *, statbuf) | |
1da177e4 LT |
344 | { |
345 | struct kstat stat; | |
2eae7a18 | 346 | int error; |
1da177e4 | 347 | |
2eae7a18 CH |
348 | error = vfs_lstat(filename, &stat); |
349 | if (error) | |
350 | return error; | |
1da177e4 | 351 | |
2eae7a18 | 352 | return cp_new_stat(&stat, statbuf); |
1da177e4 | 353 | } |
5590ff0d | 354 | |
2833c28a | 355 | #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
c7887325 | 356 | SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
6559eed8 | 357 | struct stat __user *, statbuf, int, flag) |
1da177e4 LT |
358 | { |
359 | struct kstat stat; | |
0112fc22 | 360 | int error; |
1da177e4 | 361 | |
0112fc22 OD |
362 | error = vfs_fstatat(dfd, filename, &stat, flag); |
363 | if (error) | |
364 | return error; | |
365 | return cp_new_stat(&stat, statbuf); | |
1da177e4 | 366 | } |
cff2b760 | 367 | #endif |
5590ff0d | 368 | |
257ac264 | 369 | SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
1da177e4 LT |
370 | { |
371 | struct kstat stat; | |
372 | int error = vfs_fstat(fd, &stat); | |
373 | ||
374 | if (!error) | |
375 | error = cp_new_stat(&stat, statbuf); | |
376 | ||
377 | return error; | |
378 | } | |
379 | ||
6559eed8 HC |
380 | SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
381 | char __user *, buf, int, bufsiz) | |
1da177e4 | 382 | { |
2d8f3038 | 383 | struct path path; |
1da177e4 | 384 | int error; |
1fa1e7f6 | 385 | int empty = 0; |
7955119e | 386 | unsigned int lookup_flags = LOOKUP_EMPTY; |
1da177e4 LT |
387 | |
388 | if (bufsiz <= 0) | |
389 | return -EINVAL; | |
390 | ||
7955119e JL |
391 | retry: |
392 | error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); | |
1da177e4 | 393 | if (!error) { |
bb668734 | 394 | struct inode *inode = d_backing_inode(path.dentry); |
1da177e4 | 395 | |
1fa1e7f6 | 396 | error = empty ? -ENOENT : -EINVAL; |
fd4a0edf MS |
397 | /* |
398 | * AFS mountpoints allow readlink(2) but are not symlinks | |
399 | */ | |
400 | if (d_is_symlink(path.dentry) || inode->i_op->readlink) { | |
2d8f3038 | 401 | error = security_inode_readlink(path.dentry); |
1da177e4 | 402 | if (!error) { |
68ac1234 | 403 | touch_atime(&path); |
fd4a0edf | 404 | error = vfs_readlink(path.dentry, buf, bufsiz); |
1da177e4 LT |
405 | } |
406 | } | |
2d8f3038 | 407 | path_put(&path); |
7955119e JL |
408 | if (retry_estale(error, lookup_flags)) { |
409 | lookup_flags |= LOOKUP_REVAL; | |
410 | goto retry; | |
411 | } | |
1da177e4 LT |
412 | } |
413 | return error; | |
414 | } | |
415 | ||
002c8976 HC |
416 | SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
417 | int, bufsiz) | |
5590ff0d UD |
418 | { |
419 | return sys_readlinkat(AT_FDCWD, path, buf, bufsiz); | |
420 | } | |
421 | ||
1da177e4 LT |
422 | |
423 | /* ---------- LFS-64 ----------- */ | |
0753f70f | 424 | #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
1da177e4 | 425 | |
8529f613 LT |
426 | #ifndef INIT_STRUCT_STAT64_PADDING |
427 | # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) | |
428 | #endif | |
429 | ||
1da177e4 LT |
430 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
431 | { | |
432 | struct stat64 tmp; | |
433 | ||
8529f613 | 434 | INIT_STRUCT_STAT64_PADDING(tmp); |
1da177e4 LT |
435 | #ifdef CONFIG_MIPS |
436 | /* mips has weird padding, so we don't get 64 bits there */ | |
1da177e4 LT |
437 | tmp.st_dev = new_encode_dev(stat->dev); |
438 | tmp.st_rdev = new_encode_dev(stat->rdev); | |
439 | #else | |
440 | tmp.st_dev = huge_encode_dev(stat->dev); | |
441 | tmp.st_rdev = huge_encode_dev(stat->rdev); | |
442 | #endif | |
443 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
444 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
445 | return -EOVERFLOW; | |
1da177e4 LT |
446 | #ifdef STAT64_HAS_BROKEN_ST_INO |
447 | tmp.__st_ino = stat->ino; | |
448 | #endif | |
449 | tmp.st_mode = stat->mode; | |
450 | tmp.st_nlink = stat->nlink; | |
a7c1938e EB |
451 | tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
452 | tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
1da177e4 LT |
453 | tmp.st_atime = stat->atime.tv_sec; |
454 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
455 | tmp.st_mtime = stat->mtime.tv_sec; | |
456 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
457 | tmp.st_ctime = stat->ctime.tv_sec; | |
458 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
459 | tmp.st_size = stat->size; | |
460 | tmp.st_blocks = stat->blocks; | |
461 | tmp.st_blksize = stat->blksize; | |
462 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
463 | } | |
464 | ||
c7887325 DH |
465 | SYSCALL_DEFINE2(stat64, const char __user *, filename, |
466 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
467 | { |
468 | struct kstat stat; | |
469 | int error = vfs_stat(filename, &stat); | |
470 | ||
471 | if (!error) | |
472 | error = cp_new_stat64(&stat, statbuf); | |
473 | ||
474 | return error; | |
475 | } | |
257ac264 | 476 | |
c7887325 DH |
477 | SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
478 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
479 | { |
480 | struct kstat stat; | |
481 | int error = vfs_lstat(filename, &stat); | |
482 | ||
483 | if (!error) | |
484 | error = cp_new_stat64(&stat, statbuf); | |
485 | ||
486 | return error; | |
487 | } | |
257ac264 HC |
488 | |
489 | SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) | |
1da177e4 LT |
490 | { |
491 | struct kstat stat; | |
492 | int error = vfs_fstat(fd, &stat); | |
493 | ||
494 | if (!error) | |
495 | error = cp_new_stat64(&stat, statbuf); | |
496 | ||
497 | return error; | |
498 | } | |
499 | ||
c7887325 | 500 | SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
6559eed8 | 501 | struct stat64 __user *, statbuf, int, flag) |
cff2b760 UD |
502 | { |
503 | struct kstat stat; | |
0112fc22 | 504 | int error; |
cff2b760 | 505 | |
0112fc22 OD |
506 | error = vfs_fstatat(dfd, filename, &stat, flag); |
507 | if (error) | |
508 | return error; | |
509 | return cp_new_stat64(&stat, statbuf); | |
cff2b760 | 510 | } |
0753f70f | 511 | #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
1da177e4 | 512 | |
a528d35e DH |
513 | static inline int __put_timestamp(struct timespec *kts, |
514 | struct statx_timestamp __user *uts) | |
515 | { | |
516 | return (__put_user(kts->tv_sec, &uts->tv_sec ) || | |
517 | __put_user(kts->tv_nsec, &uts->tv_nsec ) || | |
518 | __put_user(0, &uts->__reserved )); | |
519 | } | |
520 | ||
521 | /* | |
522 | * Set the statx results. | |
523 | */ | |
524 | static long statx_set_result(struct kstat *stat, struct statx __user *buffer) | |
525 | { | |
526 | uid_t uid = from_kuid_munged(current_user_ns(), stat->uid); | |
527 | gid_t gid = from_kgid_munged(current_user_ns(), stat->gid); | |
528 | ||
529 | if (__put_user(stat->result_mask, &buffer->stx_mask ) || | |
530 | __put_user(stat->mode, &buffer->stx_mode ) || | |
531 | __clear_user(&buffer->__spare0, sizeof(buffer->__spare0)) || | |
532 | __put_user(stat->nlink, &buffer->stx_nlink ) || | |
533 | __put_user(uid, &buffer->stx_uid ) || | |
534 | __put_user(gid, &buffer->stx_gid ) || | |
535 | __put_user(stat->attributes, &buffer->stx_attributes ) || | |
536 | __put_user(stat->blksize, &buffer->stx_blksize ) || | |
537 | __put_user(MAJOR(stat->rdev), &buffer->stx_rdev_major ) || | |
538 | __put_user(MINOR(stat->rdev), &buffer->stx_rdev_minor ) || | |
539 | __put_user(MAJOR(stat->dev), &buffer->stx_dev_major ) || | |
540 | __put_user(MINOR(stat->dev), &buffer->stx_dev_minor ) || | |
541 | __put_timestamp(&stat->atime, &buffer->stx_atime ) || | |
542 | __put_timestamp(&stat->btime, &buffer->stx_btime ) || | |
543 | __put_timestamp(&stat->ctime, &buffer->stx_ctime ) || | |
544 | __put_timestamp(&stat->mtime, &buffer->stx_mtime ) || | |
545 | __put_user(stat->ino, &buffer->stx_ino ) || | |
546 | __put_user(stat->size, &buffer->stx_size ) || | |
547 | __put_user(stat->blocks, &buffer->stx_blocks ) || | |
548 | __clear_user(&buffer->__spare1, sizeof(buffer->__spare1)) || | |
549 | __clear_user(&buffer->__spare2, sizeof(buffer->__spare2))) | |
550 | return -EFAULT; | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | /** | |
556 | * sys_statx - System call to get enhanced stats | |
557 | * @dfd: Base directory to pathwalk from *or* fd to stat. | |
558 | * @filename: File to stat *or* NULL. | |
559 | * @flags: AT_* flags to control pathwalk. | |
560 | * @mask: Parts of statx struct actually required. | |
561 | * @buffer: Result buffer. | |
562 | * | |
563 | * Note that if filename is NULL, then it does the equivalent of fstat() using | |
564 | * dfd to indicate the file of interest. | |
565 | */ | |
566 | SYSCALL_DEFINE5(statx, | |
567 | int, dfd, const char __user *, filename, unsigned, flags, | |
568 | unsigned int, mask, | |
569 | struct statx __user *, buffer) | |
570 | { | |
571 | struct kstat stat; | |
572 | int error; | |
573 | ||
574 | if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) | |
575 | return -EINVAL; | |
576 | if (!access_ok(VERIFY_WRITE, buffer, sizeof(*buffer))) | |
577 | return -EFAULT; | |
578 | ||
579 | if (filename) | |
580 | error = vfs_statx(dfd, filename, flags, &stat, mask); | |
581 | else | |
582 | error = vfs_statx_fd(dfd, &stat, mask, flags); | |
583 | if (error) | |
584 | return error; | |
585 | return statx_set_result(&stat, buffer); | |
586 | } | |
587 | ||
b462707e DM |
588 | /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
589 | void __inode_add_bytes(struct inode *inode, loff_t bytes) | |
1da177e4 | 590 | { |
1da177e4 LT |
591 | inode->i_blocks += bytes >> 9; |
592 | bytes &= 511; | |
593 | inode->i_bytes += bytes; | |
594 | if (inode->i_bytes >= 512) { | |
595 | inode->i_blocks++; | |
596 | inode->i_bytes -= 512; | |
597 | } | |
b462707e DM |
598 | } |
599 | ||
600 | void inode_add_bytes(struct inode *inode, loff_t bytes) | |
601 | { | |
602 | spin_lock(&inode->i_lock); | |
603 | __inode_add_bytes(inode, bytes); | |
1da177e4 LT |
604 | spin_unlock(&inode->i_lock); |
605 | } | |
606 | ||
607 | EXPORT_SYMBOL(inode_add_bytes); | |
608 | ||
1c8924eb | 609 | void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
1da177e4 | 610 | { |
1da177e4 LT |
611 | inode->i_blocks -= bytes >> 9; |
612 | bytes &= 511; | |
613 | if (inode->i_bytes < bytes) { | |
614 | inode->i_blocks--; | |
615 | inode->i_bytes += 512; | |
616 | } | |
617 | inode->i_bytes -= bytes; | |
1c8924eb JK |
618 | } |
619 | ||
620 | EXPORT_SYMBOL(__inode_sub_bytes); | |
621 | ||
622 | void inode_sub_bytes(struct inode *inode, loff_t bytes) | |
623 | { | |
624 | spin_lock(&inode->i_lock); | |
625 | __inode_sub_bytes(inode, bytes); | |
1da177e4 LT |
626 | spin_unlock(&inode->i_lock); |
627 | } | |
628 | ||
629 | EXPORT_SYMBOL(inode_sub_bytes); | |
630 | ||
631 | loff_t inode_get_bytes(struct inode *inode) | |
632 | { | |
633 | loff_t ret; | |
634 | ||
635 | spin_lock(&inode->i_lock); | |
636 | ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; | |
637 | spin_unlock(&inode->i_lock); | |
638 | return ret; | |
639 | } | |
640 | ||
641 | EXPORT_SYMBOL(inode_get_bytes); | |
642 | ||
643 | void inode_set_bytes(struct inode *inode, loff_t bytes) | |
644 | { | |
645 | /* Caller is here responsible for sufficient locking | |
646 | * (ie. inode->i_lock) */ | |
647 | inode->i_blocks = bytes >> 9; | |
648 | inode->i_bytes = bytes & 511; | |
649 | } | |
650 | ||
651 | EXPORT_SYMBOL(inode_set_bytes); |