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 | 24 | #include "internal.h" |
fa2fcf4f | 25 | #include "mount.h" |
3934e36f | 26 | |
a528d35e DH |
27 | /** |
28 | * generic_fillattr - Fill in the basic attributes from the inode struct | |
29 | * @inode: Inode to use as the source | |
30 | * @stat: Where to fill in the attributes | |
31 | * | |
32 | * Fill in the basic attributes in the kstat structure from data that's to be | |
33 | * found on the VFS inode structure. This is the default if no getattr inode | |
34 | * operation is supplied. | |
35 | */ | |
1da177e4 LT |
36 | void generic_fillattr(struct inode *inode, struct kstat *stat) |
37 | { | |
38 | stat->dev = inode->i_sb->s_dev; | |
39 | stat->ino = inode->i_ino; | |
40 | stat->mode = inode->i_mode; | |
41 | stat->nlink = inode->i_nlink; | |
42 | stat->uid = inode->i_uid; | |
43 | stat->gid = inode->i_gid; | |
44 | stat->rdev = inode->i_rdev; | |
3ddcd056 | 45 | stat->size = i_size_read(inode); |
1da177e4 LT |
46 | stat->atime = inode->i_atime; |
47 | stat->mtime = inode->i_mtime; | |
48 | stat->ctime = inode->i_ctime; | |
93407472 | 49 | stat->blksize = i_blocksize(inode); |
3ddcd056 | 50 | stat->blocks = inode->i_blocks; |
a528d35e | 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; | |
a528d35e | 74 | query_flags &= KSTAT_QUERY_FLAGS; |
801e5237 CH |
75 | |
76 | /* allow the fs to override these if it really wants to */ | |
761e28fa MS |
77 | /* SB_NOATIME means filesystem supplies dummy atime value */ |
78 | if (inode->i_sb->s_flags & SB_NOATIME) | |
801e5237 CH |
79 | stat->result_mask &= ~STATX_ATIME; |
80 | if (IS_AUTOMOUNT(inode)) | |
81 | stat->attributes |= STATX_ATTR_AUTOMOUNT; | |
82 | ||
1da177e4 | 83 | if (inode->i_op->getattr) |
a528d35e DH |
84 | return inode->i_op->getattr(path, stat, request_mask, |
85 | query_flags); | |
1da177e4 LT |
86 | |
87 | generic_fillattr(inode, stat); | |
1da177e4 LT |
88 | return 0; |
89 | } | |
b7a6ec52 BF |
90 | EXPORT_SYMBOL(vfs_getattr_nosec); |
91 | ||
a528d35e DH |
92 | /* |
93 | * vfs_getattr - Get the enhanced basic attributes of a file | |
94 | * @path: The file of interest | |
95 | * @stat: Where to return the statistics | |
96 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
97 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
98 | * | |
99 | * Ask the filesystem for a file's attributes. The caller must indicate in | |
100 | * request_mask and query_flags to indicate what they want. | |
101 | * | |
102 | * If the file is remote, the filesystem can be forced to update the attributes | |
103 | * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can | |
104 | * suppress the update by passing AT_STATX_DONT_SYNC. | |
105 | * | |
106 | * Bits must have been set in request_mask to indicate which attributes the | |
107 | * caller wants retrieving. Any such attribute not requested may be returned | |
108 | * anyway, but the value may be approximate, and, if remote, may not have been | |
109 | * synchronised with the server. | |
110 | * | |
111 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
112 | */ | |
113 | int vfs_getattr(const struct path *path, struct kstat *stat, | |
114 | u32 request_mask, unsigned int query_flags) | |
b7a6ec52 BF |
115 | { |
116 | int retval; | |
117 | ||
3f7036a0 | 118 | retval = security_inode_getattr(path); |
b7a6ec52 BF |
119 | if (retval) |
120 | return retval; | |
a528d35e | 121 | return vfs_getattr_nosec(path, stat, request_mask, query_flags); |
b7a6ec52 | 122 | } |
1da177e4 LT |
123 | EXPORT_SYMBOL(vfs_getattr); |
124 | ||
a528d35e DH |
125 | /** |
126 | * vfs_statx_fd - Get the enhanced basic attributes by file descriptor | |
127 | * @fd: The file descriptor referring to the file of interest | |
128 | * @stat: The result structure to fill in. | |
129 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
130 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
131 | * | |
132 | * This function is a wrapper around vfs_getattr(). The main difference is | |
133 | * that it uses a file descriptor to determine the file location. | |
134 | * | |
135 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
136 | */ | |
137 | int vfs_statx_fd(unsigned int fd, struct kstat *stat, | |
138 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 139 | { |
8c7493aa | 140 | struct fd f; |
1da177e4 LT |
141 | int error = -EBADF; |
142 | ||
8c7493aa EB |
143 | if (query_flags & ~KSTAT_QUERY_FLAGS) |
144 | return -EINVAL; | |
145 | ||
146 | f = fdget_raw(fd); | |
2903ff01 | 147 | if (f.file) { |
a528d35e DH |
148 | error = vfs_getattr(&f.file->f_path, stat, |
149 | request_mask, query_flags); | |
2903ff01 | 150 | fdput(f); |
1da177e4 LT |
151 | } |
152 | return error; | |
153 | } | |
a528d35e | 154 | EXPORT_SYMBOL(vfs_statx_fd); |
1da177e4 | 155 | |
3934e36f JA |
156 | inline unsigned vfs_stat_set_lookup_flags(unsigned *lookup_flags, int flags) |
157 | { | |
158 | if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | | |
159 | AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0) | |
160 | return -EINVAL; | |
161 | ||
162 | *lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT; | |
163 | if (flags & AT_SYMLINK_NOFOLLOW) | |
164 | *lookup_flags &= ~LOOKUP_FOLLOW; | |
165 | if (flags & AT_NO_AUTOMOUNT) | |
166 | *lookup_flags &= ~LOOKUP_AUTOMOUNT; | |
167 | if (flags & AT_EMPTY_PATH) | |
168 | *lookup_flags |= LOOKUP_EMPTY; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
a528d35e DH |
173 | /** |
174 | * vfs_statx - Get basic and extra attributes by filename | |
175 | * @dfd: A file descriptor representing the base dir for a relative filename | |
176 | * @filename: The name of the file of interest | |
177 | * @flags: Flags to control the query | |
178 | * @stat: The result structure to fill in. | |
179 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
180 | * | |
181 | * This function is a wrapper around vfs_getattr(). The main difference is | |
182 | * that it uses a filename and base directory to determine the file location. | |
183 | * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink | |
184 | * at the given name from being referenced. | |
185 | * | |
a528d35e DH |
186 | * 0 will be returned on success, and a -ve error code if unsuccessful. |
187 | */ | |
188 | int vfs_statx(int dfd, const char __user *filename, int flags, | |
189 | struct kstat *stat, u32 request_mask) | |
0112fc22 | 190 | { |
2eae7a18 | 191 | struct path path; |
0112fc22 | 192 | int error = -EINVAL; |
3934e36f | 193 | unsigned lookup_flags; |
0112fc22 | 194 | |
3934e36f | 195 | if (vfs_stat_set_lookup_flags(&lookup_flags, flags)) |
a528d35e | 196 | return -EINVAL; |
836fb7e7 | 197 | retry: |
2eae7a18 CH |
198 | error = user_path_at(dfd, filename, lookup_flags, &path); |
199 | if (error) | |
200 | goto out; | |
201 | ||
a528d35e | 202 | error = vfs_getattr(&path, stat, request_mask, flags); |
fa2fcf4f MS |
203 | stat->mnt_id = real_mount(path.mnt)->mnt_id; |
204 | stat->result_mask |= STATX_MNT_ID; | |
80340fe3 MS |
205 | if (path.mnt->mnt_root == path.dentry) |
206 | stat->attributes |= STATX_ATTR_MOUNT_ROOT; | |
207 | stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT; | |
2eae7a18 | 208 | path_put(&path); |
836fb7e7 JL |
209 | if (retry_estale(error, lookup_flags)) { |
210 | lookup_flags |= LOOKUP_REVAL; | |
211 | goto retry; | |
212 | } | |
0112fc22 OD |
213 | out: |
214 | return error; | |
215 | } | |
a528d35e | 216 | EXPORT_SYMBOL(vfs_statx); |
2eae7a18 | 217 | |
0112fc22 | 218 | |
1da177e4 LT |
219 | #ifdef __ARCH_WANT_OLD_STAT |
220 | ||
221 | /* | |
222 | * For backward compatibility? Maybe this should be moved | |
223 | * into arch/i386 instead? | |
224 | */ | |
225 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) | |
226 | { | |
227 | static int warncount = 5; | |
228 | struct __old_kernel_stat tmp; | |
a528d35e | 229 | |
1da177e4 LT |
230 | if (warncount > 0) { |
231 | warncount--; | |
232 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", | |
233 | current->comm); | |
234 | } else if (warncount < 0) { | |
235 | /* it's laughable, but... */ | |
236 | warncount = 0; | |
237 | } | |
238 | ||
239 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); | |
240 | tmp.st_dev = old_encode_dev(stat->dev); | |
241 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
242 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
243 | return -EOVERFLOW; | |
1da177e4 LT |
244 | tmp.st_mode = stat->mode; |
245 | tmp.st_nlink = stat->nlink; | |
246 | if (tmp.st_nlink != stat->nlink) | |
247 | return -EOVERFLOW; | |
a7c1938e EB |
248 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
249 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
1da177e4 LT |
250 | tmp.st_rdev = old_encode_dev(stat->rdev); |
251 | #if BITS_PER_LONG == 32 | |
252 | if (stat->size > MAX_NON_LFS) | |
253 | return -EOVERFLOW; | |
a528d35e | 254 | #endif |
1da177e4 LT |
255 | tmp.st_size = stat->size; |
256 | tmp.st_atime = stat->atime.tv_sec; | |
257 | tmp.st_mtime = stat->mtime.tv_sec; | |
258 | tmp.st_ctime = stat->ctime.tv_sec; | |
259 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
260 | } | |
261 | ||
c7887325 DH |
262 | SYSCALL_DEFINE2(stat, const char __user *, filename, |
263 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
264 | { |
265 | struct kstat stat; | |
2eae7a18 | 266 | int error; |
1da177e4 | 267 | |
2eae7a18 CH |
268 | error = vfs_stat(filename, &stat); |
269 | if (error) | |
270 | return error; | |
1da177e4 | 271 | |
2eae7a18 | 272 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 273 | } |
257ac264 | 274 | |
c7887325 DH |
275 | SYSCALL_DEFINE2(lstat, const char __user *, filename, |
276 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
277 | { |
278 | struct kstat stat; | |
2eae7a18 | 279 | int error; |
1da177e4 | 280 | |
2eae7a18 CH |
281 | error = vfs_lstat(filename, &stat); |
282 | if (error) | |
283 | return error; | |
1da177e4 | 284 | |
2eae7a18 | 285 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 286 | } |
257ac264 HC |
287 | |
288 | SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
289 | { |
290 | struct kstat stat; | |
291 | int error = vfs_fstat(fd, &stat); | |
292 | ||
293 | if (!error) | |
294 | error = cp_old_stat(&stat, statbuf); | |
295 | ||
296 | return error; | |
297 | } | |
298 | ||
299 | #endif /* __ARCH_WANT_OLD_STAT */ | |
300 | ||
82b355d1 AB |
301 | #ifdef __ARCH_WANT_NEW_STAT |
302 | ||
a52dd971 LT |
303 | #if BITS_PER_LONG == 32 |
304 | # define choose_32_64(a,b) a | |
305 | #else | |
306 | # define choose_32_64(a,b) b | |
307 | #endif | |
308 | ||
4c416f42 | 309 | #define valid_dev(x) choose_32_64(old_valid_dev(x),true) |
a52dd971 LT |
310 | #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) |
311 | ||
8529f613 LT |
312 | #ifndef INIT_STRUCT_STAT_PADDING |
313 | # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) | |
314 | #endif | |
315 | ||
1da177e4 LT |
316 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
317 | { | |
318 | struct stat tmp; | |
319 | ||
a52dd971 | 320 | if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) |
1da177e4 | 321 | return -EOVERFLOW; |
a52dd971 LT |
322 | #if BITS_PER_LONG == 32 |
323 | if (stat->size > MAX_NON_LFS) | |
1da177e4 LT |
324 | return -EOVERFLOW; |
325 | #endif | |
326 | ||
8529f613 | 327 | INIT_STRUCT_STAT_PADDING(tmp); |
a52dd971 | 328 | tmp.st_dev = encode_dev(stat->dev); |
1da177e4 | 329 | tmp.st_ino = stat->ino; |
afefdbb2 DH |
330 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
331 | return -EOVERFLOW; | |
1da177e4 LT |
332 | tmp.st_mode = stat->mode; |
333 | tmp.st_nlink = stat->nlink; | |
334 | if (tmp.st_nlink != stat->nlink) | |
335 | return -EOVERFLOW; | |
a7c1938e EB |
336 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
337 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
a52dd971 | 338 | tmp.st_rdev = encode_dev(stat->rdev); |
1da177e4 LT |
339 | tmp.st_size = stat->size; |
340 | tmp.st_atime = stat->atime.tv_sec; | |
341 | tmp.st_mtime = stat->mtime.tv_sec; | |
342 | tmp.st_ctime = stat->ctime.tv_sec; | |
343 | #ifdef STAT_HAVE_NSEC | |
344 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
345 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
346 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
347 | #endif | |
348 | tmp.st_blocks = stat->blocks; | |
349 | tmp.st_blksize = stat->blksize; | |
350 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
351 | } | |
352 | ||
c7887325 DH |
353 | SYSCALL_DEFINE2(newstat, const char __user *, filename, |
354 | struct stat __user *, statbuf) | |
5590ff0d UD |
355 | { |
356 | struct kstat stat; | |
2eae7a18 | 357 | int error = vfs_stat(filename, &stat); |
5590ff0d | 358 | |
2eae7a18 CH |
359 | if (error) |
360 | return error; | |
361 | return cp_new_stat(&stat, statbuf); | |
5590ff0d UD |
362 | } |
363 | ||
c7887325 DH |
364 | SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
365 | struct stat __user *, statbuf) | |
1da177e4 LT |
366 | { |
367 | struct kstat stat; | |
2eae7a18 | 368 | int error; |
1da177e4 | 369 | |
2eae7a18 CH |
370 | error = vfs_lstat(filename, &stat); |
371 | if (error) | |
372 | return error; | |
1da177e4 | 373 | |
2eae7a18 | 374 | return cp_new_stat(&stat, statbuf); |
1da177e4 | 375 | } |
5590ff0d | 376 | |
2833c28a | 377 | #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
c7887325 | 378 | SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
6559eed8 | 379 | struct stat __user *, statbuf, int, flag) |
1da177e4 LT |
380 | { |
381 | struct kstat stat; | |
0112fc22 | 382 | int error; |
1da177e4 | 383 | |
0112fc22 OD |
384 | error = vfs_fstatat(dfd, filename, &stat, flag); |
385 | if (error) | |
386 | return error; | |
387 | return cp_new_stat(&stat, statbuf); | |
1da177e4 | 388 | } |
cff2b760 | 389 | #endif |
5590ff0d | 390 | |
257ac264 | 391 | SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
1da177e4 LT |
392 | { |
393 | struct kstat stat; | |
394 | int error = vfs_fstat(fd, &stat); | |
395 | ||
396 | if (!error) | |
397 | error = cp_new_stat(&stat, statbuf); | |
398 | ||
399 | return error; | |
400 | } | |
82b355d1 | 401 | #endif |
1da177e4 | 402 | |
2dae0248 DB |
403 | static int do_readlinkat(int dfd, const char __user *pathname, |
404 | char __user *buf, int bufsiz) | |
1da177e4 | 405 | { |
2d8f3038 | 406 | struct path path; |
1da177e4 | 407 | int error; |
1fa1e7f6 | 408 | int empty = 0; |
7955119e | 409 | unsigned int lookup_flags = LOOKUP_EMPTY; |
1da177e4 LT |
410 | |
411 | if (bufsiz <= 0) | |
412 | return -EINVAL; | |
413 | ||
7955119e JL |
414 | retry: |
415 | error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); | |
1da177e4 | 416 | if (!error) { |
bb668734 | 417 | struct inode *inode = d_backing_inode(path.dentry); |
1da177e4 | 418 | |
1fa1e7f6 | 419 | error = empty ? -ENOENT : -EINVAL; |
fd4a0edf MS |
420 | /* |
421 | * AFS mountpoints allow readlink(2) but are not symlinks | |
422 | */ | |
423 | if (d_is_symlink(path.dentry) || inode->i_op->readlink) { | |
2d8f3038 | 424 | error = security_inode_readlink(path.dentry); |
1da177e4 | 425 | if (!error) { |
68ac1234 | 426 | touch_atime(&path); |
fd4a0edf | 427 | error = vfs_readlink(path.dentry, buf, bufsiz); |
1da177e4 LT |
428 | } |
429 | } | |
2d8f3038 | 430 | path_put(&path); |
7955119e JL |
431 | if (retry_estale(error, lookup_flags)) { |
432 | lookup_flags |= LOOKUP_REVAL; | |
433 | goto retry; | |
434 | } | |
1da177e4 LT |
435 | } |
436 | return error; | |
437 | } | |
438 | ||
2dae0248 DB |
439 | SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
440 | char __user *, buf, int, bufsiz) | |
441 | { | |
442 | return do_readlinkat(dfd, pathname, buf, bufsiz); | |
443 | } | |
444 | ||
002c8976 HC |
445 | SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
446 | int, bufsiz) | |
5590ff0d | 447 | { |
2dae0248 | 448 | return do_readlinkat(AT_FDCWD, path, buf, bufsiz); |
5590ff0d UD |
449 | } |
450 | ||
1da177e4 LT |
451 | |
452 | /* ---------- LFS-64 ----------- */ | |
0753f70f | 453 | #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
1da177e4 | 454 | |
8529f613 LT |
455 | #ifndef INIT_STRUCT_STAT64_PADDING |
456 | # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) | |
457 | #endif | |
458 | ||
1da177e4 LT |
459 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
460 | { | |
461 | struct stat64 tmp; | |
462 | ||
8529f613 | 463 | INIT_STRUCT_STAT64_PADDING(tmp); |
1da177e4 LT |
464 | #ifdef CONFIG_MIPS |
465 | /* mips has weird padding, so we don't get 64 bits there */ | |
1da177e4 LT |
466 | tmp.st_dev = new_encode_dev(stat->dev); |
467 | tmp.st_rdev = new_encode_dev(stat->rdev); | |
468 | #else | |
469 | tmp.st_dev = huge_encode_dev(stat->dev); | |
470 | tmp.st_rdev = huge_encode_dev(stat->rdev); | |
471 | #endif | |
472 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
473 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
474 | return -EOVERFLOW; | |
1da177e4 LT |
475 | #ifdef STAT64_HAS_BROKEN_ST_INO |
476 | tmp.__st_ino = stat->ino; | |
477 | #endif | |
478 | tmp.st_mode = stat->mode; | |
479 | tmp.st_nlink = stat->nlink; | |
a7c1938e EB |
480 | tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
481 | tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
1da177e4 LT |
482 | tmp.st_atime = stat->atime.tv_sec; |
483 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
484 | tmp.st_mtime = stat->mtime.tv_sec; | |
485 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
486 | tmp.st_ctime = stat->ctime.tv_sec; | |
487 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
488 | tmp.st_size = stat->size; | |
489 | tmp.st_blocks = stat->blocks; | |
490 | tmp.st_blksize = stat->blksize; | |
491 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
492 | } | |
493 | ||
c7887325 DH |
494 | SYSCALL_DEFINE2(stat64, const char __user *, filename, |
495 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
496 | { |
497 | struct kstat stat; | |
498 | int error = vfs_stat(filename, &stat); | |
499 | ||
500 | if (!error) | |
501 | error = cp_new_stat64(&stat, statbuf); | |
502 | ||
503 | return error; | |
504 | } | |
257ac264 | 505 | |
c7887325 DH |
506 | SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
507 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
508 | { |
509 | struct kstat stat; | |
510 | int error = vfs_lstat(filename, &stat); | |
511 | ||
512 | if (!error) | |
513 | error = cp_new_stat64(&stat, statbuf); | |
514 | ||
515 | return error; | |
516 | } | |
257ac264 HC |
517 | |
518 | SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) | |
1da177e4 LT |
519 | { |
520 | struct kstat stat; | |
521 | int error = vfs_fstat(fd, &stat); | |
522 | ||
523 | if (!error) | |
524 | error = cp_new_stat64(&stat, statbuf); | |
525 | ||
526 | return error; | |
527 | } | |
528 | ||
c7887325 | 529 | SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
6559eed8 | 530 | struct stat64 __user *, statbuf, int, flag) |
cff2b760 UD |
531 | { |
532 | struct kstat stat; | |
0112fc22 | 533 | int error; |
cff2b760 | 534 | |
0112fc22 OD |
535 | error = vfs_fstatat(dfd, filename, &stat, flag); |
536 | if (error) | |
537 | return error; | |
538 | return cp_new_stat64(&stat, statbuf); | |
cff2b760 | 539 | } |
0753f70f | 540 | #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
1da177e4 | 541 | |
3934e36f | 542 | noinline_for_stack int |
64bd7204 | 543 | cp_statx(const struct kstat *stat, struct statx __user *buffer) |
a528d35e | 544 | { |
64bd7204 EB |
545 | struct statx tmp; |
546 | ||
547 | memset(&tmp, 0, sizeof(tmp)); | |
548 | ||
549 | tmp.stx_mask = stat->result_mask; | |
550 | tmp.stx_blksize = stat->blksize; | |
551 | tmp.stx_attributes = stat->attributes; | |
552 | tmp.stx_nlink = stat->nlink; | |
553 | tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid); | |
554 | tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
555 | tmp.stx_mode = stat->mode; | |
556 | tmp.stx_ino = stat->ino; | |
557 | tmp.stx_size = stat->size; | |
558 | tmp.stx_blocks = stat->blocks; | |
3209f68b | 559 | tmp.stx_attributes_mask = stat->attributes_mask; |
64bd7204 EB |
560 | tmp.stx_atime.tv_sec = stat->atime.tv_sec; |
561 | tmp.stx_atime.tv_nsec = stat->atime.tv_nsec; | |
562 | tmp.stx_btime.tv_sec = stat->btime.tv_sec; | |
563 | tmp.stx_btime.tv_nsec = stat->btime.tv_nsec; | |
564 | tmp.stx_ctime.tv_sec = stat->ctime.tv_sec; | |
565 | tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec; | |
566 | tmp.stx_mtime.tv_sec = stat->mtime.tv_sec; | |
567 | tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec; | |
568 | tmp.stx_rdev_major = MAJOR(stat->rdev); | |
569 | tmp.stx_rdev_minor = MINOR(stat->rdev); | |
570 | tmp.stx_dev_major = MAJOR(stat->dev); | |
571 | tmp.stx_dev_minor = MINOR(stat->dev); | |
fa2fcf4f | 572 | tmp.stx_mnt_id = stat->mnt_id; |
64bd7204 EB |
573 | |
574 | return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
a528d35e DH |
575 | } |
576 | ||
577 | /** | |
578 | * sys_statx - System call to get enhanced stats | |
579 | * @dfd: Base directory to pathwalk from *or* fd to stat. | |
1e2f82d1 | 580 | * @filename: File to stat or "" with AT_EMPTY_PATH |
a528d35e DH |
581 | * @flags: AT_* flags to control pathwalk. |
582 | * @mask: Parts of statx struct actually required. | |
583 | * @buffer: Result buffer. | |
584 | * | |
1e2f82d1 DH |
585 | * Note that fstat() can be emulated by setting dfd to the fd of interest, |
586 | * supplying "" as the filename and setting AT_EMPTY_PATH in the flags. | |
a528d35e DH |
587 | */ |
588 | SYSCALL_DEFINE5(statx, | |
589 | int, dfd, const char __user *, filename, unsigned, flags, | |
590 | unsigned int, mask, | |
591 | struct statx __user *, buffer) | |
592 | { | |
593 | struct kstat stat; | |
594 | int error; | |
595 | ||
47071aee DH |
596 | if (mask & STATX__RESERVED) |
597 | return -EINVAL; | |
a528d35e DH |
598 | if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) |
599 | return -EINVAL; | |
a528d35e | 600 | |
1e2f82d1 | 601 | error = vfs_statx(dfd, filename, flags, &stat, mask); |
a528d35e DH |
602 | if (error) |
603 | return error; | |
64bd7204 EB |
604 | |
605 | return cp_statx(&stat, buffer); | |
a528d35e DH |
606 | } |
607 | ||
ac565de3 AV |
608 | #ifdef CONFIG_COMPAT |
609 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) | |
610 | { | |
611 | struct compat_stat tmp; | |
612 | ||
613 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) | |
614 | return -EOVERFLOW; | |
615 | ||
616 | memset(&tmp, 0, sizeof(tmp)); | |
617 | tmp.st_dev = old_encode_dev(stat->dev); | |
618 | tmp.st_ino = stat->ino; | |
619 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) | |
620 | return -EOVERFLOW; | |
621 | tmp.st_mode = stat->mode; | |
622 | tmp.st_nlink = stat->nlink; | |
623 | if (tmp.st_nlink != stat->nlink) | |
624 | return -EOVERFLOW; | |
625 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); | |
626 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
627 | tmp.st_rdev = old_encode_dev(stat->rdev); | |
628 | if ((u64) stat->size > MAX_NON_LFS) | |
629 | return -EOVERFLOW; | |
630 | tmp.st_size = stat->size; | |
631 | tmp.st_atime = stat->atime.tv_sec; | |
632 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
633 | tmp.st_mtime = stat->mtime.tv_sec; | |
634 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
635 | tmp.st_ctime = stat->ctime.tv_sec; | |
636 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
637 | tmp.st_blocks = stat->blocks; | |
638 | tmp.st_blksize = stat->blksize; | |
639 | return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
640 | } | |
641 | ||
642 | COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, | |
643 | struct compat_stat __user *, statbuf) | |
644 | { | |
645 | struct kstat stat; | |
646 | int error; | |
647 | ||
648 | error = vfs_stat(filename, &stat); | |
649 | if (error) | |
650 | return error; | |
651 | return cp_compat_stat(&stat, statbuf); | |
652 | } | |
653 | ||
654 | COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, | |
655 | struct compat_stat __user *, statbuf) | |
656 | { | |
657 | struct kstat stat; | |
658 | int error; | |
659 | ||
660 | error = vfs_lstat(filename, &stat); | |
661 | if (error) | |
662 | return error; | |
663 | return cp_compat_stat(&stat, statbuf); | |
664 | } | |
665 | ||
666 | #ifndef __ARCH_WANT_STAT64 | |
667 | COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, | |
668 | const char __user *, filename, | |
669 | struct compat_stat __user *, statbuf, int, flag) | |
670 | { | |
671 | struct kstat stat; | |
672 | int error; | |
673 | ||
674 | error = vfs_fstatat(dfd, filename, &stat, flag); | |
675 | if (error) | |
676 | return error; | |
677 | return cp_compat_stat(&stat, statbuf); | |
678 | } | |
679 | #endif | |
680 | ||
681 | COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, | |
682 | struct compat_stat __user *, statbuf) | |
683 | { | |
684 | struct kstat stat; | |
685 | int error = vfs_fstat(fd, &stat); | |
686 | ||
687 | if (!error) | |
688 | error = cp_compat_stat(&stat, statbuf); | |
689 | return error; | |
690 | } | |
691 | #endif | |
692 | ||
b462707e DM |
693 | /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
694 | void __inode_add_bytes(struct inode *inode, loff_t bytes) | |
1da177e4 | 695 | { |
1da177e4 LT |
696 | inode->i_blocks += bytes >> 9; |
697 | bytes &= 511; | |
698 | inode->i_bytes += bytes; | |
699 | if (inode->i_bytes >= 512) { | |
700 | inode->i_blocks++; | |
701 | inode->i_bytes -= 512; | |
702 | } | |
b462707e | 703 | } |
eb315d2a | 704 | EXPORT_SYMBOL(__inode_add_bytes); |
b462707e DM |
705 | |
706 | void inode_add_bytes(struct inode *inode, loff_t bytes) | |
707 | { | |
708 | spin_lock(&inode->i_lock); | |
709 | __inode_add_bytes(inode, bytes); | |
1da177e4 LT |
710 | spin_unlock(&inode->i_lock); |
711 | } | |
712 | ||
713 | EXPORT_SYMBOL(inode_add_bytes); | |
714 | ||
1c8924eb | 715 | void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
1da177e4 | 716 | { |
1da177e4 LT |
717 | inode->i_blocks -= bytes >> 9; |
718 | bytes &= 511; | |
719 | if (inode->i_bytes < bytes) { | |
720 | inode->i_blocks--; | |
721 | inode->i_bytes += 512; | |
722 | } | |
723 | inode->i_bytes -= bytes; | |
1c8924eb JK |
724 | } |
725 | ||
726 | EXPORT_SYMBOL(__inode_sub_bytes); | |
727 | ||
728 | void inode_sub_bytes(struct inode *inode, loff_t bytes) | |
729 | { | |
730 | spin_lock(&inode->i_lock); | |
731 | __inode_sub_bytes(inode, bytes); | |
1da177e4 LT |
732 | spin_unlock(&inode->i_lock); |
733 | } | |
734 | ||
735 | EXPORT_SYMBOL(inode_sub_bytes); | |
736 | ||
737 | loff_t inode_get_bytes(struct inode *inode) | |
738 | { | |
739 | loff_t ret; | |
740 | ||
741 | spin_lock(&inode->i_lock); | |
f4a8116a | 742 | ret = __inode_get_bytes(inode); |
1da177e4 LT |
743 | spin_unlock(&inode->i_lock); |
744 | return ret; | |
745 | } | |
746 | ||
747 | EXPORT_SYMBOL(inode_get_bytes); | |
748 | ||
749 | void inode_set_bytes(struct inode *inode, loff_t bytes) | |
750 | { | |
751 | /* Caller is here responsible for sufficient locking | |
752 | * (ie. inode->i_lock) */ | |
753 | inode->i_blocks = bytes >> 9; | |
754 | inode->i_bytes = bytes & 511; | |
755 | } | |
756 | ||
757 | EXPORT_SYMBOL(inode_set_bytes); |