Commit | Line | Data |
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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 | ||
3934e36f JA |
24 | #include "internal.h" |
25 | ||
a528d35e DH |
26 | /** |
27 | * generic_fillattr - Fill in the basic attributes from the inode struct | |
28 | * @inode: Inode to use as the source | |
29 | * @stat: Where to fill in the attributes | |
30 | * | |
31 | * Fill in the basic attributes in the kstat structure from data that's to be | |
32 | * found on the VFS inode structure. This is the default if no getattr inode | |
33 | * operation is supplied. | |
34 | */ | |
1da177e4 LT |
35 | void generic_fillattr(struct inode *inode, struct kstat *stat) |
36 | { | |
37 | stat->dev = inode->i_sb->s_dev; | |
38 | stat->ino = inode->i_ino; | |
39 | stat->mode = inode->i_mode; | |
40 | stat->nlink = inode->i_nlink; | |
41 | stat->uid = inode->i_uid; | |
42 | stat->gid = inode->i_gid; | |
43 | stat->rdev = inode->i_rdev; | |
3ddcd056 | 44 | stat->size = i_size_read(inode); |
1da177e4 LT |
45 | stat->atime = inode->i_atime; |
46 | stat->mtime = inode->i_mtime; | |
47 | stat->ctime = inode->i_ctime; | |
93407472 | 48 | stat->blksize = i_blocksize(inode); |
3ddcd056 | 49 | stat->blocks = inode->i_blocks; |
a528d35e | 50 | } |
1da177e4 LT |
51 | EXPORT_SYMBOL(generic_fillattr); |
52 | ||
b7a6ec52 BF |
53 | /** |
54 | * vfs_getattr_nosec - getattr without security checks | |
55 | * @path: file to get attributes from | |
56 | * @stat: structure to return attributes in | |
a528d35e DH |
57 | * @request_mask: STATX_xxx flags indicating what the caller wants |
58 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
b7a6ec52 BF |
59 | * |
60 | * Get attributes without calling security_inode_getattr. | |
61 | * | |
62 | * Currently the only caller other than vfs_getattr is internal to the | |
a528d35e DH |
63 | * filehandle lookup code, which uses only the inode number and returns no |
64 | * attributes to any user. Any other code probably wants vfs_getattr. | |
b7a6ec52 | 65 | */ |
a528d35e DH |
66 | int vfs_getattr_nosec(const struct path *path, struct kstat *stat, |
67 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 68 | { |
bb668734 | 69 | struct inode *inode = d_backing_inode(path->dentry); |
1da177e4 | 70 | |
a528d35e DH |
71 | memset(stat, 0, sizeof(*stat)); |
72 | stat->result_mask |= STATX_BASIC_STATS; | |
a528d35e | 73 | query_flags &= KSTAT_QUERY_FLAGS; |
801e5237 CH |
74 | |
75 | /* allow the fs to override these if it really wants to */ | |
76 | if (IS_NOATIME(inode)) | |
77 | stat->result_mask &= ~STATX_ATIME; | |
78 | if (IS_AUTOMOUNT(inode)) | |
79 | stat->attributes |= STATX_ATTR_AUTOMOUNT; | |
80 | ||
1da177e4 | 81 | if (inode->i_op->getattr) |
a528d35e DH |
82 | return inode->i_op->getattr(path, stat, request_mask, |
83 | query_flags); | |
1da177e4 LT |
84 | |
85 | generic_fillattr(inode, stat); | |
1da177e4 LT |
86 | return 0; |
87 | } | |
b7a6ec52 BF |
88 | EXPORT_SYMBOL(vfs_getattr_nosec); |
89 | ||
a528d35e DH |
90 | /* |
91 | * vfs_getattr - Get the enhanced basic attributes of a file | |
92 | * @path: The file of interest | |
93 | * @stat: Where to return the statistics | |
94 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
95 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
96 | * | |
97 | * Ask the filesystem for a file's attributes. The caller must indicate in | |
98 | * request_mask and query_flags to indicate what they want. | |
99 | * | |
100 | * If the file is remote, the filesystem can be forced to update the attributes | |
101 | * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can | |
102 | * suppress the update by passing AT_STATX_DONT_SYNC. | |
103 | * | |
104 | * Bits must have been set in request_mask to indicate which attributes the | |
105 | * caller wants retrieving. Any such attribute not requested may be returned | |
106 | * anyway, but the value may be approximate, and, if remote, may not have been | |
107 | * synchronised with the server. | |
108 | * | |
109 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
110 | */ | |
111 | int vfs_getattr(const struct path *path, struct kstat *stat, | |
112 | u32 request_mask, unsigned int query_flags) | |
b7a6ec52 BF |
113 | { |
114 | int retval; | |
115 | ||
3f7036a0 | 116 | retval = security_inode_getattr(path); |
b7a6ec52 BF |
117 | if (retval) |
118 | return retval; | |
a528d35e | 119 | return vfs_getattr_nosec(path, stat, request_mask, query_flags); |
b7a6ec52 | 120 | } |
1da177e4 LT |
121 | EXPORT_SYMBOL(vfs_getattr); |
122 | ||
a528d35e DH |
123 | /** |
124 | * vfs_statx_fd - Get the enhanced basic attributes by file descriptor | |
125 | * @fd: The file descriptor referring to the file of interest | |
126 | * @stat: The result structure to fill in. | |
127 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
128 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
129 | * | |
130 | * This function is a wrapper around vfs_getattr(). The main difference is | |
131 | * that it uses a file descriptor to determine the file location. | |
132 | * | |
133 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
134 | */ | |
135 | int vfs_statx_fd(unsigned int fd, struct kstat *stat, | |
136 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 137 | { |
8c7493aa | 138 | struct fd f; |
1da177e4 LT |
139 | int error = -EBADF; |
140 | ||
8c7493aa EB |
141 | if (query_flags & ~KSTAT_QUERY_FLAGS) |
142 | return -EINVAL; | |
143 | ||
144 | f = fdget_raw(fd); | |
2903ff01 | 145 | if (f.file) { |
a528d35e DH |
146 | error = vfs_getattr(&f.file->f_path, stat, |
147 | request_mask, query_flags); | |
2903ff01 | 148 | fdput(f); |
1da177e4 LT |
149 | } |
150 | return error; | |
151 | } | |
a528d35e | 152 | EXPORT_SYMBOL(vfs_statx_fd); |
1da177e4 | 153 | |
3934e36f JA |
154 | inline unsigned vfs_stat_set_lookup_flags(unsigned *lookup_flags, int flags) |
155 | { | |
156 | if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | | |
157 | AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0) | |
158 | return -EINVAL; | |
159 | ||
160 | *lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT; | |
161 | if (flags & AT_SYMLINK_NOFOLLOW) | |
162 | *lookup_flags &= ~LOOKUP_FOLLOW; | |
163 | if (flags & AT_NO_AUTOMOUNT) | |
164 | *lookup_flags &= ~LOOKUP_AUTOMOUNT; | |
165 | if (flags & AT_EMPTY_PATH) | |
166 | *lookup_flags |= LOOKUP_EMPTY; | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
a528d35e DH |
171 | /** |
172 | * vfs_statx - Get basic and extra attributes by filename | |
173 | * @dfd: A file descriptor representing the base dir for a relative filename | |
174 | * @filename: The name of the file of interest | |
175 | * @flags: Flags to control the query | |
176 | * @stat: The result structure to fill in. | |
177 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
178 | * | |
179 | * This function is a wrapper around vfs_getattr(). The main difference is | |
180 | * that it uses a filename and base directory to determine the file location. | |
181 | * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink | |
182 | * at the given name from being referenced. | |
183 | * | |
a528d35e DH |
184 | * 0 will be returned on success, and a -ve error code if unsuccessful. |
185 | */ | |
186 | int vfs_statx(int dfd, const char __user *filename, int flags, | |
187 | struct kstat *stat, u32 request_mask) | |
0112fc22 | 188 | { |
2eae7a18 | 189 | struct path path; |
0112fc22 | 190 | int error = -EINVAL; |
3934e36f | 191 | unsigned lookup_flags; |
0112fc22 | 192 | |
3934e36f | 193 | if (vfs_stat_set_lookup_flags(&lookup_flags, flags)) |
a528d35e | 194 | return -EINVAL; |
836fb7e7 | 195 | retry: |
2eae7a18 CH |
196 | error = user_path_at(dfd, filename, lookup_flags, &path); |
197 | if (error) | |
198 | goto out; | |
199 | ||
a528d35e | 200 | error = vfs_getattr(&path, stat, request_mask, flags); |
2eae7a18 | 201 | path_put(&path); |
836fb7e7 JL |
202 | if (retry_estale(error, lookup_flags)) { |
203 | lookup_flags |= LOOKUP_REVAL; | |
204 | goto retry; | |
205 | } | |
0112fc22 OD |
206 | out: |
207 | return error; | |
208 | } | |
a528d35e | 209 | EXPORT_SYMBOL(vfs_statx); |
2eae7a18 | 210 | |
0112fc22 | 211 | |
1da177e4 LT |
212 | #ifdef __ARCH_WANT_OLD_STAT |
213 | ||
214 | /* | |
215 | * For backward compatibility? Maybe this should be moved | |
216 | * into arch/i386 instead? | |
217 | */ | |
218 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) | |
219 | { | |
220 | static int warncount = 5; | |
221 | struct __old_kernel_stat tmp; | |
a528d35e | 222 | |
1da177e4 LT |
223 | if (warncount > 0) { |
224 | warncount--; | |
225 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", | |
226 | current->comm); | |
227 | } else if (warncount < 0) { | |
228 | /* it's laughable, but... */ | |
229 | warncount = 0; | |
230 | } | |
231 | ||
232 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); | |
233 | tmp.st_dev = old_encode_dev(stat->dev); | |
234 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
235 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
236 | return -EOVERFLOW; | |
1da177e4 LT |
237 | tmp.st_mode = stat->mode; |
238 | tmp.st_nlink = stat->nlink; | |
239 | if (tmp.st_nlink != stat->nlink) | |
240 | return -EOVERFLOW; | |
a7c1938e EB |
241 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
242 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
1da177e4 LT |
243 | tmp.st_rdev = old_encode_dev(stat->rdev); |
244 | #if BITS_PER_LONG == 32 | |
245 | if (stat->size > MAX_NON_LFS) | |
246 | return -EOVERFLOW; | |
a528d35e | 247 | #endif |
1da177e4 LT |
248 | tmp.st_size = stat->size; |
249 | tmp.st_atime = stat->atime.tv_sec; | |
250 | tmp.st_mtime = stat->mtime.tv_sec; | |
251 | tmp.st_ctime = stat->ctime.tv_sec; | |
252 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
253 | } | |
254 | ||
c7887325 DH |
255 | SYSCALL_DEFINE2(stat, 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_stat(filename, &stat); |
262 | if (error) | |
263 | return error; | |
1da177e4 | 264 | |
2eae7a18 | 265 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 266 | } |
257ac264 | 267 | |
c7887325 DH |
268 | SYSCALL_DEFINE2(lstat, const char __user *, filename, |
269 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
270 | { |
271 | struct kstat stat; | |
2eae7a18 | 272 | int error; |
1da177e4 | 273 | |
2eae7a18 CH |
274 | error = vfs_lstat(filename, &stat); |
275 | if (error) | |
276 | return error; | |
1da177e4 | 277 | |
2eae7a18 | 278 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 279 | } |
257ac264 HC |
280 | |
281 | SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
282 | { |
283 | struct kstat stat; | |
284 | int error = vfs_fstat(fd, &stat); | |
285 | ||
286 | if (!error) | |
287 | error = cp_old_stat(&stat, statbuf); | |
288 | ||
289 | return error; | |
290 | } | |
291 | ||
292 | #endif /* __ARCH_WANT_OLD_STAT */ | |
293 | ||
82b355d1 AB |
294 | #ifdef __ARCH_WANT_NEW_STAT |
295 | ||
a52dd971 LT |
296 | #if BITS_PER_LONG == 32 |
297 | # define choose_32_64(a,b) a | |
298 | #else | |
299 | # define choose_32_64(a,b) b | |
300 | #endif | |
301 | ||
4c416f42 | 302 | #define valid_dev(x) choose_32_64(old_valid_dev(x),true) |
a52dd971 LT |
303 | #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) |
304 | ||
8529f613 LT |
305 | #ifndef INIT_STRUCT_STAT_PADDING |
306 | # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) | |
307 | #endif | |
308 | ||
1da177e4 LT |
309 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
310 | { | |
311 | struct stat tmp; | |
312 | ||
a52dd971 | 313 | if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) |
1da177e4 | 314 | return -EOVERFLOW; |
a52dd971 LT |
315 | #if BITS_PER_LONG == 32 |
316 | if (stat->size > MAX_NON_LFS) | |
1da177e4 LT |
317 | return -EOVERFLOW; |
318 | #endif | |
319 | ||
8529f613 | 320 | INIT_STRUCT_STAT_PADDING(tmp); |
a52dd971 | 321 | tmp.st_dev = encode_dev(stat->dev); |
1da177e4 | 322 | tmp.st_ino = stat->ino; |
afefdbb2 DH |
323 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
324 | return -EOVERFLOW; | |
1da177e4 LT |
325 | tmp.st_mode = stat->mode; |
326 | tmp.st_nlink = stat->nlink; | |
327 | if (tmp.st_nlink != stat->nlink) | |
328 | return -EOVERFLOW; | |
a7c1938e EB |
329 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
330 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
a52dd971 | 331 | tmp.st_rdev = encode_dev(stat->rdev); |
1da177e4 LT |
332 | tmp.st_size = stat->size; |
333 | tmp.st_atime = stat->atime.tv_sec; | |
334 | tmp.st_mtime = stat->mtime.tv_sec; | |
335 | tmp.st_ctime = stat->ctime.tv_sec; | |
336 | #ifdef STAT_HAVE_NSEC | |
337 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
338 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
339 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
340 | #endif | |
341 | tmp.st_blocks = stat->blocks; | |
342 | tmp.st_blksize = stat->blksize; | |
343 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
344 | } | |
345 | ||
c7887325 DH |
346 | SYSCALL_DEFINE2(newstat, const char __user *, filename, |
347 | struct stat __user *, statbuf) | |
5590ff0d UD |
348 | { |
349 | struct kstat stat; | |
2eae7a18 | 350 | int error = vfs_stat(filename, &stat); |
5590ff0d | 351 | |
2eae7a18 CH |
352 | if (error) |
353 | return error; | |
354 | return cp_new_stat(&stat, statbuf); | |
5590ff0d UD |
355 | } |
356 | ||
c7887325 DH |
357 | SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
358 | struct stat __user *, statbuf) | |
1da177e4 LT |
359 | { |
360 | struct kstat stat; | |
2eae7a18 | 361 | int error; |
1da177e4 | 362 | |
2eae7a18 CH |
363 | error = vfs_lstat(filename, &stat); |
364 | if (error) | |
365 | return error; | |
1da177e4 | 366 | |
2eae7a18 | 367 | return cp_new_stat(&stat, statbuf); |
1da177e4 | 368 | } |
5590ff0d | 369 | |
2833c28a | 370 | #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
c7887325 | 371 | SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
6559eed8 | 372 | struct stat __user *, statbuf, int, flag) |
1da177e4 LT |
373 | { |
374 | struct kstat stat; | |
0112fc22 | 375 | int error; |
1da177e4 | 376 | |
0112fc22 OD |
377 | error = vfs_fstatat(dfd, filename, &stat, flag); |
378 | if (error) | |
379 | return error; | |
380 | return cp_new_stat(&stat, statbuf); | |
1da177e4 | 381 | } |
cff2b760 | 382 | #endif |
5590ff0d | 383 | |
257ac264 | 384 | SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
1da177e4 LT |
385 | { |
386 | struct kstat stat; | |
387 | int error = vfs_fstat(fd, &stat); | |
388 | ||
389 | if (!error) | |
390 | error = cp_new_stat(&stat, statbuf); | |
391 | ||
392 | return error; | |
393 | } | |
82b355d1 | 394 | #endif |
1da177e4 | 395 | |
2dae0248 DB |
396 | static int do_readlinkat(int dfd, const char __user *pathname, |
397 | char __user *buf, int bufsiz) | |
1da177e4 | 398 | { |
2d8f3038 | 399 | struct path path; |
1da177e4 | 400 | int error; |
1fa1e7f6 | 401 | int empty = 0; |
7955119e | 402 | unsigned int lookup_flags = LOOKUP_EMPTY; |
1da177e4 LT |
403 | |
404 | if (bufsiz <= 0) | |
405 | return -EINVAL; | |
406 | ||
7955119e JL |
407 | retry: |
408 | error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); | |
1da177e4 | 409 | if (!error) { |
bb668734 | 410 | struct inode *inode = d_backing_inode(path.dentry); |
1da177e4 | 411 | |
1fa1e7f6 | 412 | error = empty ? -ENOENT : -EINVAL; |
fd4a0edf MS |
413 | /* |
414 | * AFS mountpoints allow readlink(2) but are not symlinks | |
415 | */ | |
416 | if (d_is_symlink(path.dentry) || inode->i_op->readlink) { | |
2d8f3038 | 417 | error = security_inode_readlink(path.dentry); |
1da177e4 | 418 | if (!error) { |
68ac1234 | 419 | touch_atime(&path); |
fd4a0edf | 420 | error = vfs_readlink(path.dentry, buf, bufsiz); |
1da177e4 LT |
421 | } |
422 | } | |
2d8f3038 | 423 | path_put(&path); |
7955119e JL |
424 | if (retry_estale(error, lookup_flags)) { |
425 | lookup_flags |= LOOKUP_REVAL; | |
426 | goto retry; | |
427 | } | |
1da177e4 LT |
428 | } |
429 | return error; | |
430 | } | |
431 | ||
2dae0248 DB |
432 | SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
433 | char __user *, buf, int, bufsiz) | |
434 | { | |
435 | return do_readlinkat(dfd, pathname, buf, bufsiz); | |
436 | } | |
437 | ||
002c8976 HC |
438 | SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
439 | int, bufsiz) | |
5590ff0d | 440 | { |
2dae0248 | 441 | return do_readlinkat(AT_FDCWD, path, buf, bufsiz); |
5590ff0d UD |
442 | } |
443 | ||
1da177e4 LT |
444 | |
445 | /* ---------- LFS-64 ----------- */ | |
0753f70f | 446 | #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
1da177e4 | 447 | |
8529f613 LT |
448 | #ifndef INIT_STRUCT_STAT64_PADDING |
449 | # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) | |
450 | #endif | |
451 | ||
1da177e4 LT |
452 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
453 | { | |
454 | struct stat64 tmp; | |
455 | ||
8529f613 | 456 | INIT_STRUCT_STAT64_PADDING(tmp); |
1da177e4 LT |
457 | #ifdef CONFIG_MIPS |
458 | /* mips has weird padding, so we don't get 64 bits there */ | |
1da177e4 LT |
459 | tmp.st_dev = new_encode_dev(stat->dev); |
460 | tmp.st_rdev = new_encode_dev(stat->rdev); | |
461 | #else | |
462 | tmp.st_dev = huge_encode_dev(stat->dev); | |
463 | tmp.st_rdev = huge_encode_dev(stat->rdev); | |
464 | #endif | |
465 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
466 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
467 | return -EOVERFLOW; | |
1da177e4 LT |
468 | #ifdef STAT64_HAS_BROKEN_ST_INO |
469 | tmp.__st_ino = stat->ino; | |
470 | #endif | |
471 | tmp.st_mode = stat->mode; | |
472 | tmp.st_nlink = stat->nlink; | |
a7c1938e EB |
473 | tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
474 | tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
1da177e4 LT |
475 | tmp.st_atime = stat->atime.tv_sec; |
476 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
477 | tmp.st_mtime = stat->mtime.tv_sec; | |
478 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
479 | tmp.st_ctime = stat->ctime.tv_sec; | |
480 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
481 | tmp.st_size = stat->size; | |
482 | tmp.st_blocks = stat->blocks; | |
483 | tmp.st_blksize = stat->blksize; | |
484 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
485 | } | |
486 | ||
c7887325 DH |
487 | SYSCALL_DEFINE2(stat64, const char __user *, filename, |
488 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
489 | { |
490 | struct kstat stat; | |
491 | int error = vfs_stat(filename, &stat); | |
492 | ||
493 | if (!error) | |
494 | error = cp_new_stat64(&stat, statbuf); | |
495 | ||
496 | return error; | |
497 | } | |
257ac264 | 498 | |
c7887325 DH |
499 | SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
500 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
501 | { |
502 | struct kstat stat; | |
503 | int error = vfs_lstat(filename, &stat); | |
504 | ||
505 | if (!error) | |
506 | error = cp_new_stat64(&stat, statbuf); | |
507 | ||
508 | return error; | |
509 | } | |
257ac264 HC |
510 | |
511 | SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) | |
1da177e4 LT |
512 | { |
513 | struct kstat stat; | |
514 | int error = vfs_fstat(fd, &stat); | |
515 | ||
516 | if (!error) | |
517 | error = cp_new_stat64(&stat, statbuf); | |
518 | ||
519 | return error; | |
520 | } | |
521 | ||
c7887325 | 522 | SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
6559eed8 | 523 | struct stat64 __user *, statbuf, int, flag) |
cff2b760 UD |
524 | { |
525 | struct kstat stat; | |
0112fc22 | 526 | int error; |
cff2b760 | 527 | |
0112fc22 OD |
528 | error = vfs_fstatat(dfd, filename, &stat, flag); |
529 | if (error) | |
530 | return error; | |
531 | return cp_new_stat64(&stat, statbuf); | |
cff2b760 | 532 | } |
0753f70f | 533 | #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
1da177e4 | 534 | |
3934e36f | 535 | noinline_for_stack int |
64bd7204 | 536 | cp_statx(const struct kstat *stat, struct statx __user *buffer) |
a528d35e | 537 | { |
64bd7204 EB |
538 | struct statx tmp; |
539 | ||
540 | memset(&tmp, 0, sizeof(tmp)); | |
541 | ||
542 | tmp.stx_mask = stat->result_mask; | |
543 | tmp.stx_blksize = stat->blksize; | |
544 | tmp.stx_attributes = stat->attributes; | |
545 | tmp.stx_nlink = stat->nlink; | |
546 | tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid); | |
547 | tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
548 | tmp.stx_mode = stat->mode; | |
549 | tmp.stx_ino = stat->ino; | |
550 | tmp.stx_size = stat->size; | |
551 | tmp.stx_blocks = stat->blocks; | |
3209f68b | 552 | tmp.stx_attributes_mask = stat->attributes_mask; |
64bd7204 EB |
553 | tmp.stx_atime.tv_sec = stat->atime.tv_sec; |
554 | tmp.stx_atime.tv_nsec = stat->atime.tv_nsec; | |
555 | tmp.stx_btime.tv_sec = stat->btime.tv_sec; | |
556 | tmp.stx_btime.tv_nsec = stat->btime.tv_nsec; | |
557 | tmp.stx_ctime.tv_sec = stat->ctime.tv_sec; | |
558 | tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec; | |
559 | tmp.stx_mtime.tv_sec = stat->mtime.tv_sec; | |
560 | tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec; | |
561 | tmp.stx_rdev_major = MAJOR(stat->rdev); | |
562 | tmp.stx_rdev_minor = MINOR(stat->rdev); | |
563 | tmp.stx_dev_major = MAJOR(stat->dev); | |
564 | tmp.stx_dev_minor = MINOR(stat->dev); | |
565 | ||
566 | return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
a528d35e DH |
567 | } |
568 | ||
569 | /** | |
570 | * sys_statx - System call to get enhanced stats | |
571 | * @dfd: Base directory to pathwalk from *or* fd to stat. | |
1e2f82d1 | 572 | * @filename: File to stat or "" with AT_EMPTY_PATH |
a528d35e DH |
573 | * @flags: AT_* flags to control pathwalk. |
574 | * @mask: Parts of statx struct actually required. | |
575 | * @buffer: Result buffer. | |
576 | * | |
1e2f82d1 DH |
577 | * Note that fstat() can be emulated by setting dfd to the fd of interest, |
578 | * supplying "" as the filename and setting AT_EMPTY_PATH in the flags. | |
a528d35e DH |
579 | */ |
580 | SYSCALL_DEFINE5(statx, | |
581 | int, dfd, const char __user *, filename, unsigned, flags, | |
582 | unsigned int, mask, | |
583 | struct statx __user *, buffer) | |
584 | { | |
585 | struct kstat stat; | |
586 | int error; | |
587 | ||
47071aee DH |
588 | if (mask & STATX__RESERVED) |
589 | return -EINVAL; | |
a528d35e DH |
590 | if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) |
591 | return -EINVAL; | |
a528d35e | 592 | |
1e2f82d1 | 593 | error = vfs_statx(dfd, filename, flags, &stat, mask); |
a528d35e DH |
594 | if (error) |
595 | return error; | |
64bd7204 EB |
596 | |
597 | return cp_statx(&stat, buffer); | |
a528d35e DH |
598 | } |
599 | ||
ac565de3 AV |
600 | #ifdef CONFIG_COMPAT |
601 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) | |
602 | { | |
603 | struct compat_stat tmp; | |
604 | ||
605 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) | |
606 | return -EOVERFLOW; | |
607 | ||
608 | memset(&tmp, 0, sizeof(tmp)); | |
609 | tmp.st_dev = old_encode_dev(stat->dev); | |
610 | tmp.st_ino = stat->ino; | |
611 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) | |
612 | return -EOVERFLOW; | |
613 | tmp.st_mode = stat->mode; | |
614 | tmp.st_nlink = stat->nlink; | |
615 | if (tmp.st_nlink != stat->nlink) | |
616 | return -EOVERFLOW; | |
617 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); | |
618 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
619 | tmp.st_rdev = old_encode_dev(stat->rdev); | |
620 | if ((u64) stat->size > MAX_NON_LFS) | |
621 | return -EOVERFLOW; | |
622 | tmp.st_size = stat->size; | |
623 | tmp.st_atime = stat->atime.tv_sec; | |
624 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
625 | tmp.st_mtime = stat->mtime.tv_sec; | |
626 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
627 | tmp.st_ctime = stat->ctime.tv_sec; | |
628 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
629 | tmp.st_blocks = stat->blocks; | |
630 | tmp.st_blksize = stat->blksize; | |
631 | return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
632 | } | |
633 | ||
634 | COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, | |
635 | struct compat_stat __user *, statbuf) | |
636 | { | |
637 | struct kstat stat; | |
638 | int error; | |
639 | ||
640 | error = vfs_stat(filename, &stat); | |
641 | if (error) | |
642 | return error; | |
643 | return cp_compat_stat(&stat, statbuf); | |
644 | } | |
645 | ||
646 | COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, | |
647 | struct compat_stat __user *, statbuf) | |
648 | { | |
649 | struct kstat stat; | |
650 | int error; | |
651 | ||
652 | error = vfs_lstat(filename, &stat); | |
653 | if (error) | |
654 | return error; | |
655 | return cp_compat_stat(&stat, statbuf); | |
656 | } | |
657 | ||
658 | #ifndef __ARCH_WANT_STAT64 | |
659 | COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, | |
660 | const char __user *, filename, | |
661 | struct compat_stat __user *, statbuf, int, flag) | |
662 | { | |
663 | struct kstat stat; | |
664 | int error; | |
665 | ||
666 | error = vfs_fstatat(dfd, filename, &stat, flag); | |
667 | if (error) | |
668 | return error; | |
669 | return cp_compat_stat(&stat, statbuf); | |
670 | } | |
671 | #endif | |
672 | ||
673 | COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, | |
674 | struct compat_stat __user *, statbuf) | |
675 | { | |
676 | struct kstat stat; | |
677 | int error = vfs_fstat(fd, &stat); | |
678 | ||
679 | if (!error) | |
680 | error = cp_compat_stat(&stat, statbuf); | |
681 | return error; | |
682 | } | |
683 | #endif | |
684 | ||
b462707e DM |
685 | /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
686 | void __inode_add_bytes(struct inode *inode, loff_t bytes) | |
1da177e4 | 687 | { |
1da177e4 LT |
688 | inode->i_blocks += bytes >> 9; |
689 | bytes &= 511; | |
690 | inode->i_bytes += bytes; | |
691 | if (inode->i_bytes >= 512) { | |
692 | inode->i_blocks++; | |
693 | inode->i_bytes -= 512; | |
694 | } | |
b462707e | 695 | } |
eb315d2a | 696 | EXPORT_SYMBOL(__inode_add_bytes); |
b462707e DM |
697 | |
698 | void inode_add_bytes(struct inode *inode, loff_t bytes) | |
699 | { | |
700 | spin_lock(&inode->i_lock); | |
701 | __inode_add_bytes(inode, bytes); | |
1da177e4 LT |
702 | spin_unlock(&inode->i_lock); |
703 | } | |
704 | ||
705 | EXPORT_SYMBOL(inode_add_bytes); | |
706 | ||
1c8924eb | 707 | void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
1da177e4 | 708 | { |
1da177e4 LT |
709 | inode->i_blocks -= bytes >> 9; |
710 | bytes &= 511; | |
711 | if (inode->i_bytes < bytes) { | |
712 | inode->i_blocks--; | |
713 | inode->i_bytes += 512; | |
714 | } | |
715 | inode->i_bytes -= bytes; | |
1c8924eb JK |
716 | } |
717 | ||
718 | EXPORT_SYMBOL(__inode_sub_bytes); | |
719 | ||
720 | void inode_sub_bytes(struct inode *inode, loff_t bytes) | |
721 | { | |
722 | spin_lock(&inode->i_lock); | |
723 | __inode_sub_bytes(inode, bytes); | |
1da177e4 LT |
724 | spin_unlock(&inode->i_lock); |
725 | } | |
726 | ||
727 | EXPORT_SYMBOL(inode_sub_bytes); | |
728 | ||
729 | loff_t inode_get_bytes(struct inode *inode) | |
730 | { | |
731 | loff_t ret; | |
732 | ||
733 | spin_lock(&inode->i_lock); | |
f4a8116a | 734 | ret = __inode_get_bytes(inode); |
1da177e4 LT |
735 | spin_unlock(&inode->i_lock); |
736 | return ret; | |
737 | } | |
738 | ||
739 | EXPORT_SYMBOL(inode_get_bytes); | |
740 | ||
741 | void inode_set_bytes(struct inode *inode, loff_t bytes) | |
742 | { | |
743 | /* Caller is here responsible for sufficient locking | |
744 | * (ie. inode->i_lock) */ | |
745 | inode->i_blocks = bytes >> 9; | |
746 | inode->i_bytes = bytes & 511; | |
747 | } | |
748 | ||
749 | EXPORT_SYMBOL(inode_set_bytes); |