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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 | ||
712b2698 IW |
83 | if (IS_DAX(inode)) |
84 | stat->attributes |= STATX_ATTR_DAX; | |
85 | ||
1da177e4 | 86 | if (inode->i_op->getattr) |
a528d35e DH |
87 | return inode->i_op->getattr(path, stat, request_mask, |
88 | query_flags); | |
1da177e4 LT |
89 | |
90 | generic_fillattr(inode, stat); | |
1da177e4 LT |
91 | return 0; |
92 | } | |
b7a6ec52 BF |
93 | EXPORT_SYMBOL(vfs_getattr_nosec); |
94 | ||
a528d35e DH |
95 | /* |
96 | * vfs_getattr - Get the enhanced basic attributes of a file | |
97 | * @path: The file of interest | |
98 | * @stat: Where to return the statistics | |
99 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
100 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
101 | * | |
102 | * Ask the filesystem for a file's attributes. The caller must indicate in | |
103 | * request_mask and query_flags to indicate what they want. | |
104 | * | |
105 | * If the file is remote, the filesystem can be forced to update the attributes | |
106 | * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can | |
107 | * suppress the update by passing AT_STATX_DONT_SYNC. | |
108 | * | |
109 | * Bits must have been set in request_mask to indicate which attributes the | |
110 | * caller wants retrieving. Any such attribute not requested may be returned | |
111 | * anyway, but the value may be approximate, and, if remote, may not have been | |
112 | * synchronised with the server. | |
113 | * | |
114 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
115 | */ | |
116 | int vfs_getattr(const struct path *path, struct kstat *stat, | |
117 | u32 request_mask, unsigned int query_flags) | |
b7a6ec52 BF |
118 | { |
119 | int retval; | |
120 | ||
3f7036a0 | 121 | retval = security_inode_getattr(path); |
b7a6ec52 BF |
122 | if (retval) |
123 | return retval; | |
a528d35e | 124 | return vfs_getattr_nosec(path, stat, request_mask, query_flags); |
b7a6ec52 | 125 | } |
1da177e4 LT |
126 | EXPORT_SYMBOL(vfs_getattr); |
127 | ||
a528d35e DH |
128 | /** |
129 | * vfs_statx_fd - Get the enhanced basic attributes by file descriptor | |
130 | * @fd: The file descriptor referring to the file of interest | |
131 | * @stat: The result structure to fill in. | |
132 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
133 | * @query_flags: Query mode (KSTAT_QUERY_FLAGS) | |
134 | * | |
135 | * This function is a wrapper around vfs_getattr(). The main difference is | |
136 | * that it uses a file descriptor to determine the file location. | |
137 | * | |
138 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
139 | */ | |
140 | int vfs_statx_fd(unsigned int fd, struct kstat *stat, | |
141 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 142 | { |
8c7493aa | 143 | struct fd f; |
1da177e4 LT |
144 | int error = -EBADF; |
145 | ||
8c7493aa EB |
146 | if (query_flags & ~KSTAT_QUERY_FLAGS) |
147 | return -EINVAL; | |
148 | ||
149 | f = fdget_raw(fd); | |
2903ff01 | 150 | if (f.file) { |
a528d35e DH |
151 | error = vfs_getattr(&f.file->f_path, stat, |
152 | request_mask, query_flags); | |
2903ff01 | 153 | fdput(f); |
1da177e4 LT |
154 | } |
155 | return error; | |
156 | } | |
a528d35e | 157 | EXPORT_SYMBOL(vfs_statx_fd); |
1da177e4 | 158 | |
6f88cc17 BM |
159 | static inline unsigned vfs_stat_set_lookup_flags(unsigned *lookup_flags, |
160 | int flags) | |
3934e36f JA |
161 | { |
162 | if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | | |
163 | AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0) | |
164 | return -EINVAL; | |
165 | ||
166 | *lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT; | |
167 | if (flags & AT_SYMLINK_NOFOLLOW) | |
168 | *lookup_flags &= ~LOOKUP_FOLLOW; | |
169 | if (flags & AT_NO_AUTOMOUNT) | |
170 | *lookup_flags &= ~LOOKUP_AUTOMOUNT; | |
171 | if (flags & AT_EMPTY_PATH) | |
172 | *lookup_flags |= LOOKUP_EMPTY; | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
a528d35e DH |
177 | /** |
178 | * vfs_statx - Get basic and extra attributes by filename | |
179 | * @dfd: A file descriptor representing the base dir for a relative filename | |
180 | * @filename: The name of the file of interest | |
181 | * @flags: Flags to control the query | |
182 | * @stat: The result structure to fill in. | |
183 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
184 | * | |
185 | * This function is a wrapper around vfs_getattr(). The main difference is | |
186 | * that it uses a filename and base directory to determine the file location. | |
187 | * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink | |
188 | * at the given name from being referenced. | |
189 | * | |
a528d35e DH |
190 | * 0 will be returned on success, and a -ve error code if unsuccessful. |
191 | */ | |
192 | int vfs_statx(int dfd, const char __user *filename, int flags, | |
193 | struct kstat *stat, u32 request_mask) | |
0112fc22 | 194 | { |
2eae7a18 | 195 | struct path path; |
0112fc22 | 196 | int error = -EINVAL; |
3934e36f | 197 | unsigned lookup_flags; |
0112fc22 | 198 | |
3934e36f | 199 | if (vfs_stat_set_lookup_flags(&lookup_flags, flags)) |
a528d35e | 200 | return -EINVAL; |
836fb7e7 | 201 | retry: |
2eae7a18 CH |
202 | error = user_path_at(dfd, filename, lookup_flags, &path); |
203 | if (error) | |
204 | goto out; | |
205 | ||
a528d35e | 206 | error = vfs_getattr(&path, stat, request_mask, flags); |
fa2fcf4f MS |
207 | stat->mnt_id = real_mount(path.mnt)->mnt_id; |
208 | stat->result_mask |= STATX_MNT_ID; | |
80340fe3 MS |
209 | if (path.mnt->mnt_root == path.dentry) |
210 | stat->attributes |= STATX_ATTR_MOUNT_ROOT; | |
211 | stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT; | |
2eae7a18 | 212 | path_put(&path); |
836fb7e7 JL |
213 | if (retry_estale(error, lookup_flags)) { |
214 | lookup_flags |= LOOKUP_REVAL; | |
215 | goto retry; | |
216 | } | |
0112fc22 OD |
217 | out: |
218 | return error; | |
219 | } | |
a528d35e | 220 | EXPORT_SYMBOL(vfs_statx); |
2eae7a18 | 221 | |
0112fc22 | 222 | |
1da177e4 LT |
223 | #ifdef __ARCH_WANT_OLD_STAT |
224 | ||
225 | /* | |
226 | * For backward compatibility? Maybe this should be moved | |
227 | * into arch/i386 instead? | |
228 | */ | |
229 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) | |
230 | { | |
231 | static int warncount = 5; | |
232 | struct __old_kernel_stat tmp; | |
a528d35e | 233 | |
1da177e4 LT |
234 | if (warncount > 0) { |
235 | warncount--; | |
236 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", | |
237 | current->comm); | |
238 | } else if (warncount < 0) { | |
239 | /* it's laughable, but... */ | |
240 | warncount = 0; | |
241 | } | |
242 | ||
243 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); | |
244 | tmp.st_dev = old_encode_dev(stat->dev); | |
245 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
246 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
247 | return -EOVERFLOW; | |
1da177e4 LT |
248 | tmp.st_mode = stat->mode; |
249 | tmp.st_nlink = stat->nlink; | |
250 | if (tmp.st_nlink != stat->nlink) | |
251 | return -EOVERFLOW; | |
a7c1938e EB |
252 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
253 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
1da177e4 LT |
254 | tmp.st_rdev = old_encode_dev(stat->rdev); |
255 | #if BITS_PER_LONG == 32 | |
256 | if (stat->size > MAX_NON_LFS) | |
257 | return -EOVERFLOW; | |
a528d35e | 258 | #endif |
1da177e4 LT |
259 | tmp.st_size = stat->size; |
260 | tmp.st_atime = stat->atime.tv_sec; | |
261 | tmp.st_mtime = stat->mtime.tv_sec; | |
262 | tmp.st_ctime = stat->ctime.tv_sec; | |
263 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
264 | } | |
265 | ||
c7887325 DH |
266 | SYSCALL_DEFINE2(stat, const char __user *, filename, |
267 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
268 | { |
269 | struct kstat stat; | |
2eae7a18 | 270 | int error; |
1da177e4 | 271 | |
2eae7a18 CH |
272 | error = vfs_stat(filename, &stat); |
273 | if (error) | |
274 | return error; | |
1da177e4 | 275 | |
2eae7a18 | 276 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 277 | } |
257ac264 | 278 | |
c7887325 DH |
279 | SYSCALL_DEFINE2(lstat, const char __user *, filename, |
280 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
281 | { |
282 | struct kstat stat; | |
2eae7a18 | 283 | int error; |
1da177e4 | 284 | |
2eae7a18 CH |
285 | error = vfs_lstat(filename, &stat); |
286 | if (error) | |
287 | return error; | |
1da177e4 | 288 | |
2eae7a18 | 289 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 290 | } |
257ac264 HC |
291 | |
292 | SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
293 | { |
294 | struct kstat stat; | |
295 | int error = vfs_fstat(fd, &stat); | |
296 | ||
297 | if (!error) | |
298 | error = cp_old_stat(&stat, statbuf); | |
299 | ||
300 | return error; | |
301 | } | |
302 | ||
303 | #endif /* __ARCH_WANT_OLD_STAT */ | |
304 | ||
82b355d1 AB |
305 | #ifdef __ARCH_WANT_NEW_STAT |
306 | ||
a52dd971 LT |
307 | #if BITS_PER_LONG == 32 |
308 | # define choose_32_64(a,b) a | |
309 | #else | |
310 | # define choose_32_64(a,b) b | |
311 | #endif | |
312 | ||
4c416f42 | 313 | #define valid_dev(x) choose_32_64(old_valid_dev(x),true) |
a52dd971 LT |
314 | #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) |
315 | ||
8529f613 LT |
316 | #ifndef INIT_STRUCT_STAT_PADDING |
317 | # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) | |
318 | #endif | |
319 | ||
1da177e4 LT |
320 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
321 | { | |
322 | struct stat tmp; | |
323 | ||
a52dd971 | 324 | if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) |
1da177e4 | 325 | return -EOVERFLOW; |
a52dd971 LT |
326 | #if BITS_PER_LONG == 32 |
327 | if (stat->size > MAX_NON_LFS) | |
1da177e4 LT |
328 | return -EOVERFLOW; |
329 | #endif | |
330 | ||
8529f613 | 331 | INIT_STRUCT_STAT_PADDING(tmp); |
a52dd971 | 332 | tmp.st_dev = encode_dev(stat->dev); |
1da177e4 | 333 | tmp.st_ino = stat->ino; |
afefdbb2 DH |
334 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
335 | return -EOVERFLOW; | |
1da177e4 LT |
336 | tmp.st_mode = stat->mode; |
337 | tmp.st_nlink = stat->nlink; | |
338 | if (tmp.st_nlink != stat->nlink) | |
339 | return -EOVERFLOW; | |
a7c1938e EB |
340 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
341 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
a52dd971 | 342 | tmp.st_rdev = encode_dev(stat->rdev); |
1da177e4 LT |
343 | tmp.st_size = stat->size; |
344 | tmp.st_atime = stat->atime.tv_sec; | |
345 | tmp.st_mtime = stat->mtime.tv_sec; | |
346 | tmp.st_ctime = stat->ctime.tv_sec; | |
347 | #ifdef STAT_HAVE_NSEC | |
348 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
349 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
350 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
351 | #endif | |
352 | tmp.st_blocks = stat->blocks; | |
353 | tmp.st_blksize = stat->blksize; | |
354 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
355 | } | |
356 | ||
c7887325 DH |
357 | SYSCALL_DEFINE2(newstat, const char __user *, filename, |
358 | struct stat __user *, statbuf) | |
5590ff0d UD |
359 | { |
360 | struct kstat stat; | |
2eae7a18 | 361 | int error = vfs_stat(filename, &stat); |
5590ff0d | 362 | |
2eae7a18 CH |
363 | if (error) |
364 | return error; | |
365 | return cp_new_stat(&stat, statbuf); | |
5590ff0d UD |
366 | } |
367 | ||
c7887325 DH |
368 | SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
369 | struct stat __user *, statbuf) | |
1da177e4 LT |
370 | { |
371 | struct kstat stat; | |
2eae7a18 | 372 | int error; |
1da177e4 | 373 | |
2eae7a18 CH |
374 | error = vfs_lstat(filename, &stat); |
375 | if (error) | |
376 | return error; | |
1da177e4 | 377 | |
2eae7a18 | 378 | return cp_new_stat(&stat, statbuf); |
1da177e4 | 379 | } |
5590ff0d | 380 | |
2833c28a | 381 | #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
c7887325 | 382 | SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
6559eed8 | 383 | struct stat __user *, statbuf, int, flag) |
1da177e4 LT |
384 | { |
385 | struct kstat stat; | |
0112fc22 | 386 | int error; |
1da177e4 | 387 | |
0112fc22 OD |
388 | error = vfs_fstatat(dfd, filename, &stat, flag); |
389 | if (error) | |
390 | return error; | |
391 | return cp_new_stat(&stat, statbuf); | |
1da177e4 | 392 | } |
cff2b760 | 393 | #endif |
5590ff0d | 394 | |
257ac264 | 395 | SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
1da177e4 LT |
396 | { |
397 | struct kstat stat; | |
398 | int error = vfs_fstat(fd, &stat); | |
399 | ||
400 | if (!error) | |
401 | error = cp_new_stat(&stat, statbuf); | |
402 | ||
403 | return error; | |
404 | } | |
82b355d1 | 405 | #endif |
1da177e4 | 406 | |
2dae0248 DB |
407 | static int do_readlinkat(int dfd, const char __user *pathname, |
408 | char __user *buf, int bufsiz) | |
1da177e4 | 409 | { |
2d8f3038 | 410 | struct path path; |
1da177e4 | 411 | int error; |
1fa1e7f6 | 412 | int empty = 0; |
7955119e | 413 | unsigned int lookup_flags = LOOKUP_EMPTY; |
1da177e4 LT |
414 | |
415 | if (bufsiz <= 0) | |
416 | return -EINVAL; | |
417 | ||
7955119e JL |
418 | retry: |
419 | error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); | |
1da177e4 | 420 | if (!error) { |
bb668734 | 421 | struct inode *inode = d_backing_inode(path.dentry); |
1da177e4 | 422 | |
1fa1e7f6 | 423 | error = empty ? -ENOENT : -EINVAL; |
fd4a0edf MS |
424 | /* |
425 | * AFS mountpoints allow readlink(2) but are not symlinks | |
426 | */ | |
427 | if (d_is_symlink(path.dentry) || inode->i_op->readlink) { | |
2d8f3038 | 428 | error = security_inode_readlink(path.dentry); |
1da177e4 | 429 | if (!error) { |
68ac1234 | 430 | touch_atime(&path); |
fd4a0edf | 431 | error = vfs_readlink(path.dentry, buf, bufsiz); |
1da177e4 LT |
432 | } |
433 | } | |
2d8f3038 | 434 | path_put(&path); |
7955119e JL |
435 | if (retry_estale(error, lookup_flags)) { |
436 | lookup_flags |= LOOKUP_REVAL; | |
437 | goto retry; | |
438 | } | |
1da177e4 LT |
439 | } |
440 | return error; | |
441 | } | |
442 | ||
2dae0248 DB |
443 | SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
444 | char __user *, buf, int, bufsiz) | |
445 | { | |
446 | return do_readlinkat(dfd, pathname, buf, bufsiz); | |
447 | } | |
448 | ||
002c8976 HC |
449 | SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
450 | int, bufsiz) | |
5590ff0d | 451 | { |
2dae0248 | 452 | return do_readlinkat(AT_FDCWD, path, buf, bufsiz); |
5590ff0d UD |
453 | } |
454 | ||
1da177e4 LT |
455 | |
456 | /* ---------- LFS-64 ----------- */ | |
0753f70f | 457 | #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
1da177e4 | 458 | |
8529f613 LT |
459 | #ifndef INIT_STRUCT_STAT64_PADDING |
460 | # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) | |
461 | #endif | |
462 | ||
1da177e4 LT |
463 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
464 | { | |
465 | struct stat64 tmp; | |
466 | ||
8529f613 | 467 | INIT_STRUCT_STAT64_PADDING(tmp); |
1da177e4 LT |
468 | #ifdef CONFIG_MIPS |
469 | /* mips has weird padding, so we don't get 64 bits there */ | |
1da177e4 LT |
470 | tmp.st_dev = new_encode_dev(stat->dev); |
471 | tmp.st_rdev = new_encode_dev(stat->rdev); | |
472 | #else | |
473 | tmp.st_dev = huge_encode_dev(stat->dev); | |
474 | tmp.st_rdev = huge_encode_dev(stat->rdev); | |
475 | #endif | |
476 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
477 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
478 | return -EOVERFLOW; | |
1da177e4 LT |
479 | #ifdef STAT64_HAS_BROKEN_ST_INO |
480 | tmp.__st_ino = stat->ino; | |
481 | #endif | |
482 | tmp.st_mode = stat->mode; | |
483 | tmp.st_nlink = stat->nlink; | |
a7c1938e EB |
484 | tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
485 | tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
1da177e4 LT |
486 | tmp.st_atime = stat->atime.tv_sec; |
487 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
488 | tmp.st_mtime = stat->mtime.tv_sec; | |
489 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
490 | tmp.st_ctime = stat->ctime.tv_sec; | |
491 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
492 | tmp.st_size = stat->size; | |
493 | tmp.st_blocks = stat->blocks; | |
494 | tmp.st_blksize = stat->blksize; | |
495 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
496 | } | |
497 | ||
c7887325 DH |
498 | SYSCALL_DEFINE2(stat64, const char __user *, filename, |
499 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
500 | { |
501 | struct kstat stat; | |
502 | int error = vfs_stat(filename, &stat); | |
503 | ||
504 | if (!error) | |
505 | error = cp_new_stat64(&stat, statbuf); | |
506 | ||
507 | return error; | |
508 | } | |
257ac264 | 509 | |
c7887325 DH |
510 | SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
511 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
512 | { |
513 | struct kstat stat; | |
514 | int error = vfs_lstat(filename, &stat); | |
515 | ||
516 | if (!error) | |
517 | error = cp_new_stat64(&stat, statbuf); | |
518 | ||
519 | return error; | |
520 | } | |
257ac264 HC |
521 | |
522 | SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) | |
1da177e4 LT |
523 | { |
524 | struct kstat stat; | |
525 | int error = vfs_fstat(fd, &stat); | |
526 | ||
527 | if (!error) | |
528 | error = cp_new_stat64(&stat, statbuf); | |
529 | ||
530 | return error; | |
531 | } | |
532 | ||
c7887325 | 533 | SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
6559eed8 | 534 | struct stat64 __user *, statbuf, int, flag) |
cff2b760 UD |
535 | { |
536 | struct kstat stat; | |
0112fc22 | 537 | int error; |
cff2b760 | 538 | |
0112fc22 OD |
539 | error = vfs_fstatat(dfd, filename, &stat, flag); |
540 | if (error) | |
541 | return error; | |
542 | return cp_new_stat64(&stat, statbuf); | |
cff2b760 | 543 | } |
0753f70f | 544 | #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
1da177e4 | 545 | |
6f88cc17 | 546 | static noinline_for_stack int |
64bd7204 | 547 | cp_statx(const struct kstat *stat, struct statx __user *buffer) |
a528d35e | 548 | { |
64bd7204 EB |
549 | struct statx tmp; |
550 | ||
551 | memset(&tmp, 0, sizeof(tmp)); | |
552 | ||
553 | tmp.stx_mask = stat->result_mask; | |
554 | tmp.stx_blksize = stat->blksize; | |
555 | tmp.stx_attributes = stat->attributes; | |
556 | tmp.stx_nlink = stat->nlink; | |
557 | tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid); | |
558 | tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
559 | tmp.stx_mode = stat->mode; | |
560 | tmp.stx_ino = stat->ino; | |
561 | tmp.stx_size = stat->size; | |
562 | tmp.stx_blocks = stat->blocks; | |
3209f68b | 563 | tmp.stx_attributes_mask = stat->attributes_mask; |
64bd7204 EB |
564 | tmp.stx_atime.tv_sec = stat->atime.tv_sec; |
565 | tmp.stx_atime.tv_nsec = stat->atime.tv_nsec; | |
566 | tmp.stx_btime.tv_sec = stat->btime.tv_sec; | |
567 | tmp.stx_btime.tv_nsec = stat->btime.tv_nsec; | |
568 | tmp.stx_ctime.tv_sec = stat->ctime.tv_sec; | |
569 | tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec; | |
570 | tmp.stx_mtime.tv_sec = stat->mtime.tv_sec; | |
571 | tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec; | |
572 | tmp.stx_rdev_major = MAJOR(stat->rdev); | |
573 | tmp.stx_rdev_minor = MINOR(stat->rdev); | |
574 | tmp.stx_dev_major = MAJOR(stat->dev); | |
575 | tmp.stx_dev_minor = MINOR(stat->dev); | |
fa2fcf4f | 576 | tmp.stx_mnt_id = stat->mnt_id; |
64bd7204 EB |
577 | |
578 | return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
a528d35e DH |
579 | } |
580 | ||
0018784f BM |
581 | int do_statx(int dfd, const char __user *filename, unsigned flags, |
582 | unsigned int mask, struct statx __user *buffer) | |
583 | { | |
584 | struct kstat stat; | |
585 | int error; | |
586 | ||
587 | if (mask & STATX__RESERVED) | |
588 | return -EINVAL; | |
589 | if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) | |
590 | return -EINVAL; | |
591 | ||
592 | error = vfs_statx(dfd, filename, flags, &stat, mask); | |
593 | if (error) | |
594 | return error; | |
595 | ||
596 | return cp_statx(&stat, buffer); | |
597 | } | |
598 | ||
a528d35e DH |
599 | /** |
600 | * sys_statx - System call to get enhanced stats | |
601 | * @dfd: Base directory to pathwalk from *or* fd to stat. | |
1e2f82d1 | 602 | * @filename: File to stat or "" with AT_EMPTY_PATH |
a528d35e DH |
603 | * @flags: AT_* flags to control pathwalk. |
604 | * @mask: Parts of statx struct actually required. | |
605 | * @buffer: Result buffer. | |
606 | * | |
1e2f82d1 DH |
607 | * Note that fstat() can be emulated by setting dfd to the fd of interest, |
608 | * supplying "" as the filename and setting AT_EMPTY_PATH in the flags. | |
a528d35e DH |
609 | */ |
610 | SYSCALL_DEFINE5(statx, | |
611 | int, dfd, const char __user *, filename, unsigned, flags, | |
612 | unsigned int, mask, | |
613 | struct statx __user *, buffer) | |
614 | { | |
0018784f | 615 | return do_statx(dfd, filename, flags, mask, buffer); |
a528d35e DH |
616 | } |
617 | ||
ac565de3 AV |
618 | #ifdef CONFIG_COMPAT |
619 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) | |
620 | { | |
621 | struct compat_stat tmp; | |
622 | ||
623 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) | |
624 | return -EOVERFLOW; | |
625 | ||
626 | memset(&tmp, 0, sizeof(tmp)); | |
627 | tmp.st_dev = old_encode_dev(stat->dev); | |
628 | tmp.st_ino = stat->ino; | |
629 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) | |
630 | return -EOVERFLOW; | |
631 | tmp.st_mode = stat->mode; | |
632 | tmp.st_nlink = stat->nlink; | |
633 | if (tmp.st_nlink != stat->nlink) | |
634 | return -EOVERFLOW; | |
635 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); | |
636 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
637 | tmp.st_rdev = old_encode_dev(stat->rdev); | |
638 | if ((u64) stat->size > MAX_NON_LFS) | |
639 | return -EOVERFLOW; | |
640 | tmp.st_size = stat->size; | |
641 | tmp.st_atime = stat->atime.tv_sec; | |
642 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
643 | tmp.st_mtime = stat->mtime.tv_sec; | |
644 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
645 | tmp.st_ctime = stat->ctime.tv_sec; | |
646 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
647 | tmp.st_blocks = stat->blocks; | |
648 | tmp.st_blksize = stat->blksize; | |
649 | return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
650 | } | |
651 | ||
652 | COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, | |
653 | struct compat_stat __user *, statbuf) | |
654 | { | |
655 | struct kstat stat; | |
656 | int error; | |
657 | ||
658 | error = vfs_stat(filename, &stat); | |
659 | if (error) | |
660 | return error; | |
661 | return cp_compat_stat(&stat, statbuf); | |
662 | } | |
663 | ||
664 | COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, | |
665 | struct compat_stat __user *, statbuf) | |
666 | { | |
667 | struct kstat stat; | |
668 | int error; | |
669 | ||
670 | error = vfs_lstat(filename, &stat); | |
671 | if (error) | |
672 | return error; | |
673 | return cp_compat_stat(&stat, statbuf); | |
674 | } | |
675 | ||
676 | #ifndef __ARCH_WANT_STAT64 | |
677 | COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, | |
678 | const char __user *, filename, | |
679 | struct compat_stat __user *, statbuf, int, flag) | |
680 | { | |
681 | struct kstat stat; | |
682 | int error; | |
683 | ||
684 | error = vfs_fstatat(dfd, filename, &stat, flag); | |
685 | if (error) | |
686 | return error; | |
687 | return cp_compat_stat(&stat, statbuf); | |
688 | } | |
689 | #endif | |
690 | ||
691 | COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, | |
692 | struct compat_stat __user *, statbuf) | |
693 | { | |
694 | struct kstat stat; | |
695 | int error = vfs_fstat(fd, &stat); | |
696 | ||
697 | if (!error) | |
698 | error = cp_compat_stat(&stat, statbuf); | |
699 | return error; | |
700 | } | |
701 | #endif | |
702 | ||
b462707e DM |
703 | /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
704 | void __inode_add_bytes(struct inode *inode, loff_t bytes) | |
1da177e4 | 705 | { |
1da177e4 LT |
706 | inode->i_blocks += bytes >> 9; |
707 | bytes &= 511; | |
708 | inode->i_bytes += bytes; | |
709 | if (inode->i_bytes >= 512) { | |
710 | inode->i_blocks++; | |
711 | inode->i_bytes -= 512; | |
712 | } | |
b462707e | 713 | } |
eb315d2a | 714 | EXPORT_SYMBOL(__inode_add_bytes); |
b462707e DM |
715 | |
716 | void inode_add_bytes(struct inode *inode, loff_t bytes) | |
717 | { | |
718 | spin_lock(&inode->i_lock); | |
719 | __inode_add_bytes(inode, bytes); | |
1da177e4 LT |
720 | spin_unlock(&inode->i_lock); |
721 | } | |
722 | ||
723 | EXPORT_SYMBOL(inode_add_bytes); | |
724 | ||
1c8924eb | 725 | void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
1da177e4 | 726 | { |
1da177e4 LT |
727 | inode->i_blocks -= bytes >> 9; |
728 | bytes &= 511; | |
729 | if (inode->i_bytes < bytes) { | |
730 | inode->i_blocks--; | |
731 | inode->i_bytes += 512; | |
732 | } | |
733 | inode->i_bytes -= bytes; | |
1c8924eb JK |
734 | } |
735 | ||
736 | EXPORT_SYMBOL(__inode_sub_bytes); | |
737 | ||
738 | void inode_sub_bytes(struct inode *inode, loff_t bytes) | |
739 | { | |
740 | spin_lock(&inode->i_lock); | |
741 | __inode_sub_bytes(inode, bytes); | |
1da177e4 LT |
742 | spin_unlock(&inode->i_lock); |
743 | } | |
744 | ||
745 | EXPORT_SYMBOL(inode_sub_bytes); | |
746 | ||
747 | loff_t inode_get_bytes(struct inode *inode) | |
748 | { | |
749 | loff_t ret; | |
750 | ||
751 | spin_lock(&inode->i_lock); | |
f4a8116a | 752 | ret = __inode_get_bytes(inode); |
1da177e4 LT |
753 | spin_unlock(&inode->i_lock); |
754 | return ret; | |
755 | } | |
756 | ||
757 | EXPORT_SYMBOL(inode_get_bytes); | |
758 | ||
759 | void inode_set_bytes(struct inode *inode, loff_t bytes) | |
760 | { | |
761 | /* Caller is here responsible for sufficient locking | |
762 | * (ie. inode->i_lock) */ | |
763 | inode->i_blocks = bytes >> 9; | |
764 | inode->i_bytes = bytes & 511; | |
765 | } | |
766 | ||
767 | EXPORT_SYMBOL(inode_set_bytes); |