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 | |
0d56a451 CB |
29 | * @mnt_userns: user namespace of the mount the inode was found from |
30 | * @inode: Inode to use as the source | |
31 | * @stat: Where to fill in the attributes | |
a528d35e DH |
32 | * |
33 | * Fill in the basic attributes in the kstat structure from data that's to be | |
34 | * found on the VFS inode structure. This is the default if no getattr inode | |
35 | * operation is supplied. | |
0d56a451 CB |
36 | * |
37 | * If the inode has been found through an idmapped mount the user namespace of | |
38 | * the vfsmount must be passed through @mnt_userns. This function will then | |
39 | * take care to map the inode according to @mnt_userns before filling in the | |
40 | * uid and gid filds. On non-idmapped mounts or if permission checking is to be | |
41 | * performed on the raw inode simply passs init_user_ns. | |
a528d35e | 42 | */ |
0d56a451 CB |
43 | void generic_fillattr(struct user_namespace *mnt_userns, struct inode *inode, |
44 | struct kstat *stat) | |
1da177e4 LT |
45 | { |
46 | stat->dev = inode->i_sb->s_dev; | |
47 | stat->ino = inode->i_ino; | |
48 | stat->mode = inode->i_mode; | |
49 | stat->nlink = inode->i_nlink; | |
0d56a451 CB |
50 | stat->uid = i_uid_into_mnt(mnt_userns, inode); |
51 | stat->gid = i_gid_into_mnt(mnt_userns, inode); | |
1da177e4 | 52 | stat->rdev = inode->i_rdev; |
3ddcd056 | 53 | stat->size = i_size_read(inode); |
1da177e4 LT |
54 | stat->atime = inode->i_atime; |
55 | stat->mtime = inode->i_mtime; | |
56 | stat->ctime = inode->i_ctime; | |
93407472 | 57 | stat->blksize = i_blocksize(inode); |
3ddcd056 | 58 | stat->blocks = inode->i_blocks; |
a528d35e | 59 | } |
1da177e4 LT |
60 | EXPORT_SYMBOL(generic_fillattr); |
61 | ||
b7a6ec52 BF |
62 | /** |
63 | * vfs_getattr_nosec - getattr without security checks | |
64 | * @path: file to get attributes from | |
65 | * @stat: structure to return attributes in | |
a528d35e | 66 | * @request_mask: STATX_xxx flags indicating what the caller wants |
f2d077ff | 67 | * @query_flags: Query mode (AT_STATX_SYNC_TYPE) |
b7a6ec52 BF |
68 | * |
69 | * Get attributes without calling security_inode_getattr. | |
70 | * | |
71 | * Currently the only caller other than vfs_getattr is internal to the | |
a528d35e DH |
72 | * filehandle lookup code, which uses only the inode number and returns no |
73 | * attributes to any user. Any other code probably wants vfs_getattr. | |
b7a6ec52 | 74 | */ |
a528d35e DH |
75 | int vfs_getattr_nosec(const struct path *path, struct kstat *stat, |
76 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 77 | { |
549c7297 | 78 | struct user_namespace *mnt_userns; |
bb668734 | 79 | struct inode *inode = d_backing_inode(path->dentry); |
1da177e4 | 80 | |
a528d35e DH |
81 | memset(stat, 0, sizeof(*stat)); |
82 | stat->result_mask |= STATX_BASIC_STATS; | |
f2d077ff | 83 | query_flags &= AT_STATX_SYNC_TYPE; |
801e5237 CH |
84 | |
85 | /* allow the fs to override these if it really wants to */ | |
761e28fa MS |
86 | /* SB_NOATIME means filesystem supplies dummy atime value */ |
87 | if (inode->i_sb->s_flags & SB_NOATIME) | |
801e5237 CH |
88 | stat->result_mask &= ~STATX_ATIME; |
89 | if (IS_AUTOMOUNT(inode)) | |
90 | stat->attributes |= STATX_ATTR_AUTOMOUNT; | |
91 | ||
712b2698 IW |
92 | if (IS_DAX(inode)) |
93 | stat->attributes |= STATX_ATTR_DAX; | |
94 | ||
549c7297 | 95 | mnt_userns = mnt_user_ns(path->mnt); |
1da177e4 | 96 | if (inode->i_op->getattr) |
549c7297 CB |
97 | return inode->i_op->getattr(mnt_userns, path, stat, |
98 | request_mask, query_flags); | |
1da177e4 | 99 | |
549c7297 | 100 | generic_fillattr(mnt_userns, inode, stat); |
1da177e4 LT |
101 | return 0; |
102 | } | |
b7a6ec52 BF |
103 | EXPORT_SYMBOL(vfs_getattr_nosec); |
104 | ||
a528d35e DH |
105 | /* |
106 | * vfs_getattr - Get the enhanced basic attributes of a file | |
107 | * @path: The file of interest | |
108 | * @stat: Where to return the statistics | |
109 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
f2d077ff | 110 | * @query_flags: Query mode (AT_STATX_SYNC_TYPE) |
a528d35e DH |
111 | * |
112 | * Ask the filesystem for a file's attributes. The caller must indicate in | |
113 | * request_mask and query_flags to indicate what they want. | |
114 | * | |
115 | * If the file is remote, the filesystem can be forced to update the attributes | |
116 | * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can | |
117 | * suppress the update by passing AT_STATX_DONT_SYNC. | |
118 | * | |
119 | * Bits must have been set in request_mask to indicate which attributes the | |
120 | * caller wants retrieving. Any such attribute not requested may be returned | |
121 | * anyway, but the value may be approximate, and, if remote, may not have been | |
122 | * synchronised with the server. | |
123 | * | |
124 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
125 | */ | |
126 | int vfs_getattr(const struct path *path, struct kstat *stat, | |
127 | u32 request_mask, unsigned int query_flags) | |
b7a6ec52 BF |
128 | { |
129 | int retval; | |
130 | ||
3f7036a0 | 131 | retval = security_inode_getattr(path); |
b7a6ec52 BF |
132 | if (retval) |
133 | return retval; | |
a528d35e | 134 | return vfs_getattr_nosec(path, stat, request_mask, query_flags); |
b7a6ec52 | 135 | } |
1da177e4 LT |
136 | EXPORT_SYMBOL(vfs_getattr); |
137 | ||
a528d35e | 138 | /** |
da9aa5d9 | 139 | * vfs_fstat - Get the basic attributes by file descriptor |
a528d35e DH |
140 | * @fd: The file descriptor referring to the file of interest |
141 | * @stat: The result structure to fill in. | |
a528d35e DH |
142 | * |
143 | * This function is a wrapper around vfs_getattr(). The main difference is | |
144 | * that it uses a file descriptor to determine the file location. | |
145 | * | |
146 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
147 | */ | |
da9aa5d9 | 148 | int vfs_fstat(int fd, struct kstat *stat) |
1da177e4 | 149 | { |
8c7493aa | 150 | struct fd f; |
da9aa5d9 | 151 | int error; |
8c7493aa EB |
152 | |
153 | f = fdget_raw(fd); | |
da9aa5d9 CH |
154 | if (!f.file) |
155 | return -EBADF; | |
156 | error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0); | |
157 | fdput(f); | |
1da177e4 LT |
158 | return error; |
159 | } | |
1da177e4 | 160 | |
a528d35e DH |
161 | /** |
162 | * vfs_statx - Get basic and extra attributes by filename | |
163 | * @dfd: A file descriptor representing the base dir for a relative filename | |
164 | * @filename: The name of the file of interest | |
165 | * @flags: Flags to control the query | |
166 | * @stat: The result structure to fill in. | |
167 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
168 | * | |
169 | * This function is a wrapper around vfs_getattr(). The main difference is | |
170 | * that it uses a filename and base directory to determine the file location. | |
171 | * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink | |
172 | * at the given name from being referenced. | |
173 | * | |
a528d35e DH |
174 | * 0 will be returned on success, and a -ve error code if unsuccessful. |
175 | */ | |
09f1bde4 | 176 | static int vfs_statx(int dfd, const char __user *filename, int flags, |
a528d35e | 177 | struct kstat *stat, u32 request_mask) |
0112fc22 | 178 | { |
2eae7a18 | 179 | struct path path; |
b3f05150 CH |
180 | unsigned lookup_flags = 0; |
181 | int error; | |
0112fc22 | 182 | |
b3f05150 | 183 | if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH | |
f2d077ff | 184 | AT_STATX_SYNC_TYPE)) |
a528d35e | 185 | return -EINVAL; |
b3f05150 CH |
186 | |
187 | if (!(flags & AT_SYMLINK_NOFOLLOW)) | |
188 | lookup_flags |= LOOKUP_FOLLOW; | |
189 | if (!(flags & AT_NO_AUTOMOUNT)) | |
190 | lookup_flags |= LOOKUP_AUTOMOUNT; | |
191 | if (flags & AT_EMPTY_PATH) | |
192 | lookup_flags |= LOOKUP_EMPTY; | |
193 | ||
836fb7e7 | 194 | retry: |
2eae7a18 CH |
195 | error = user_path_at(dfd, filename, lookup_flags, &path); |
196 | if (error) | |
197 | goto out; | |
198 | ||
a528d35e | 199 | error = vfs_getattr(&path, stat, request_mask, flags); |
fa2fcf4f MS |
200 | stat->mnt_id = real_mount(path.mnt)->mnt_id; |
201 | stat->result_mask |= STATX_MNT_ID; | |
80340fe3 MS |
202 | if (path.mnt->mnt_root == path.dentry) |
203 | stat->attributes |= STATX_ATTR_MOUNT_ROOT; | |
204 | stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT; | |
2eae7a18 | 205 | path_put(&path); |
836fb7e7 JL |
206 | if (retry_estale(error, lookup_flags)) { |
207 | lookup_flags |= LOOKUP_REVAL; | |
208 | goto retry; | |
209 | } | |
0112fc22 OD |
210 | out: |
211 | return error; | |
212 | } | |
2eae7a18 | 213 | |
09f1bde4 CH |
214 | int vfs_fstatat(int dfd, const char __user *filename, |
215 | struct kstat *stat, int flags) | |
216 | { | |
217 | return vfs_statx(dfd, filename, flags | AT_NO_AUTOMOUNT, | |
218 | stat, STATX_BASIC_STATS); | |
219 | } | |
0112fc22 | 220 | |
1da177e4 LT |
221 | #ifdef __ARCH_WANT_OLD_STAT |
222 | ||
223 | /* | |
224 | * For backward compatibility? Maybe this should be moved | |
225 | * into arch/i386 instead? | |
226 | */ | |
227 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) | |
228 | { | |
229 | static int warncount = 5; | |
230 | struct __old_kernel_stat tmp; | |
a528d35e | 231 | |
1da177e4 LT |
232 | if (warncount > 0) { |
233 | warncount--; | |
234 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", | |
235 | current->comm); | |
236 | } else if (warncount < 0) { | |
237 | /* it's laughable, but... */ | |
238 | warncount = 0; | |
239 | } | |
240 | ||
241 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); | |
242 | tmp.st_dev = old_encode_dev(stat->dev); | |
243 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
244 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
245 | return -EOVERFLOW; | |
1da177e4 LT |
246 | tmp.st_mode = stat->mode; |
247 | tmp.st_nlink = stat->nlink; | |
248 | if (tmp.st_nlink != stat->nlink) | |
249 | return -EOVERFLOW; | |
a7c1938e EB |
250 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
251 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
1da177e4 LT |
252 | tmp.st_rdev = old_encode_dev(stat->rdev); |
253 | #if BITS_PER_LONG == 32 | |
254 | if (stat->size > MAX_NON_LFS) | |
255 | return -EOVERFLOW; | |
a528d35e | 256 | #endif |
1da177e4 LT |
257 | tmp.st_size = stat->size; |
258 | tmp.st_atime = stat->atime.tv_sec; | |
259 | tmp.st_mtime = stat->mtime.tv_sec; | |
260 | tmp.st_ctime = stat->ctime.tv_sec; | |
261 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
262 | } | |
263 | ||
c7887325 DH |
264 | SYSCALL_DEFINE2(stat, const char __user *, filename, |
265 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
266 | { |
267 | struct kstat stat; | |
2eae7a18 | 268 | int error; |
1da177e4 | 269 | |
2eae7a18 CH |
270 | error = vfs_stat(filename, &stat); |
271 | if (error) | |
272 | return error; | |
1da177e4 | 273 | |
2eae7a18 | 274 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 275 | } |
257ac264 | 276 | |
c7887325 DH |
277 | SYSCALL_DEFINE2(lstat, const char __user *, filename, |
278 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
279 | { |
280 | struct kstat stat; | |
2eae7a18 | 281 | int error; |
1da177e4 | 282 | |
2eae7a18 CH |
283 | error = vfs_lstat(filename, &stat); |
284 | if (error) | |
285 | return error; | |
1da177e4 | 286 | |
2eae7a18 | 287 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 288 | } |
257ac264 HC |
289 | |
290 | SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
291 | { |
292 | struct kstat stat; | |
293 | int error = vfs_fstat(fd, &stat); | |
294 | ||
295 | if (!error) | |
296 | error = cp_old_stat(&stat, statbuf); | |
297 | ||
298 | return error; | |
299 | } | |
300 | ||
301 | #endif /* __ARCH_WANT_OLD_STAT */ | |
302 | ||
82b355d1 AB |
303 | #ifdef __ARCH_WANT_NEW_STAT |
304 | ||
a52dd971 LT |
305 | #if BITS_PER_LONG == 32 |
306 | # define choose_32_64(a,b) a | |
307 | #else | |
308 | # define choose_32_64(a,b) b | |
309 | #endif | |
310 | ||
4c416f42 | 311 | #define valid_dev(x) choose_32_64(old_valid_dev(x),true) |
a52dd971 LT |
312 | #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) |
313 | ||
8529f613 LT |
314 | #ifndef INIT_STRUCT_STAT_PADDING |
315 | # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) | |
316 | #endif | |
317 | ||
1da177e4 LT |
318 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
319 | { | |
320 | struct stat tmp; | |
321 | ||
a52dd971 | 322 | if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) |
1da177e4 | 323 | return -EOVERFLOW; |
a52dd971 LT |
324 | #if BITS_PER_LONG == 32 |
325 | if (stat->size > MAX_NON_LFS) | |
1da177e4 LT |
326 | return -EOVERFLOW; |
327 | #endif | |
328 | ||
8529f613 | 329 | INIT_STRUCT_STAT_PADDING(tmp); |
a52dd971 | 330 | tmp.st_dev = encode_dev(stat->dev); |
1da177e4 | 331 | tmp.st_ino = stat->ino; |
afefdbb2 DH |
332 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
333 | return -EOVERFLOW; | |
1da177e4 LT |
334 | tmp.st_mode = stat->mode; |
335 | tmp.st_nlink = stat->nlink; | |
336 | if (tmp.st_nlink != stat->nlink) | |
337 | return -EOVERFLOW; | |
a7c1938e EB |
338 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
339 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
a52dd971 | 340 | tmp.st_rdev = encode_dev(stat->rdev); |
1da177e4 LT |
341 | tmp.st_size = stat->size; |
342 | tmp.st_atime = stat->atime.tv_sec; | |
343 | tmp.st_mtime = stat->mtime.tv_sec; | |
344 | tmp.st_ctime = stat->ctime.tv_sec; | |
345 | #ifdef STAT_HAVE_NSEC | |
346 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
347 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
348 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
349 | #endif | |
350 | tmp.st_blocks = stat->blocks; | |
351 | tmp.st_blksize = stat->blksize; | |
352 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
353 | } | |
354 | ||
c7887325 DH |
355 | SYSCALL_DEFINE2(newstat, const char __user *, filename, |
356 | struct stat __user *, statbuf) | |
5590ff0d UD |
357 | { |
358 | struct kstat stat; | |
2eae7a18 | 359 | int error = vfs_stat(filename, &stat); |
5590ff0d | 360 | |
2eae7a18 CH |
361 | if (error) |
362 | return error; | |
363 | return cp_new_stat(&stat, statbuf); | |
5590ff0d UD |
364 | } |
365 | ||
c7887325 DH |
366 | SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
367 | struct stat __user *, statbuf) | |
1da177e4 LT |
368 | { |
369 | struct kstat stat; | |
2eae7a18 | 370 | int error; |
1da177e4 | 371 | |
2eae7a18 CH |
372 | error = vfs_lstat(filename, &stat); |
373 | if (error) | |
374 | return error; | |
1da177e4 | 375 | |
2eae7a18 | 376 | return cp_new_stat(&stat, statbuf); |
1da177e4 | 377 | } |
5590ff0d | 378 | |
2833c28a | 379 | #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
c7887325 | 380 | SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
6559eed8 | 381 | struct stat __user *, statbuf, int, flag) |
1da177e4 LT |
382 | { |
383 | struct kstat stat; | |
0112fc22 | 384 | int error; |
1da177e4 | 385 | |
0112fc22 OD |
386 | error = vfs_fstatat(dfd, filename, &stat, flag); |
387 | if (error) | |
388 | return error; | |
389 | return cp_new_stat(&stat, statbuf); | |
1da177e4 | 390 | } |
cff2b760 | 391 | #endif |
5590ff0d | 392 | |
257ac264 | 393 | SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
1da177e4 LT |
394 | { |
395 | struct kstat stat; | |
396 | int error = vfs_fstat(fd, &stat); | |
397 | ||
398 | if (!error) | |
399 | error = cp_new_stat(&stat, statbuf); | |
400 | ||
401 | return error; | |
402 | } | |
82b355d1 | 403 | #endif |
1da177e4 | 404 | |
2dae0248 DB |
405 | static int do_readlinkat(int dfd, const char __user *pathname, |
406 | char __user *buf, int bufsiz) | |
1da177e4 | 407 | { |
2d8f3038 | 408 | struct path path; |
1da177e4 | 409 | int error; |
1fa1e7f6 | 410 | int empty = 0; |
7955119e | 411 | unsigned int lookup_flags = LOOKUP_EMPTY; |
1da177e4 LT |
412 | |
413 | if (bufsiz <= 0) | |
414 | return -EINVAL; | |
415 | ||
7955119e JL |
416 | retry: |
417 | error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); | |
1da177e4 | 418 | if (!error) { |
bb668734 | 419 | struct inode *inode = d_backing_inode(path.dentry); |
1da177e4 | 420 | |
1fa1e7f6 | 421 | error = empty ? -ENOENT : -EINVAL; |
fd4a0edf MS |
422 | /* |
423 | * AFS mountpoints allow readlink(2) but are not symlinks | |
424 | */ | |
425 | if (d_is_symlink(path.dentry) || inode->i_op->readlink) { | |
2d8f3038 | 426 | error = security_inode_readlink(path.dentry); |
1da177e4 | 427 | if (!error) { |
68ac1234 | 428 | touch_atime(&path); |
fd4a0edf | 429 | error = vfs_readlink(path.dentry, buf, bufsiz); |
1da177e4 LT |
430 | } |
431 | } | |
2d8f3038 | 432 | path_put(&path); |
7955119e JL |
433 | if (retry_estale(error, lookup_flags)) { |
434 | lookup_flags |= LOOKUP_REVAL; | |
435 | goto retry; | |
436 | } | |
1da177e4 LT |
437 | } |
438 | return error; | |
439 | } | |
440 | ||
2dae0248 DB |
441 | SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
442 | char __user *, buf, int, bufsiz) | |
443 | { | |
444 | return do_readlinkat(dfd, pathname, buf, bufsiz); | |
445 | } | |
446 | ||
002c8976 HC |
447 | SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
448 | int, bufsiz) | |
5590ff0d | 449 | { |
2dae0248 | 450 | return do_readlinkat(AT_FDCWD, path, buf, bufsiz); |
5590ff0d UD |
451 | } |
452 | ||
1da177e4 LT |
453 | |
454 | /* ---------- LFS-64 ----------- */ | |
0753f70f | 455 | #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
1da177e4 | 456 | |
8529f613 LT |
457 | #ifndef INIT_STRUCT_STAT64_PADDING |
458 | # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) | |
459 | #endif | |
460 | ||
1da177e4 LT |
461 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
462 | { | |
463 | struct stat64 tmp; | |
464 | ||
8529f613 | 465 | INIT_STRUCT_STAT64_PADDING(tmp); |
1da177e4 LT |
466 | #ifdef CONFIG_MIPS |
467 | /* mips has weird padding, so we don't get 64 bits there */ | |
1da177e4 LT |
468 | tmp.st_dev = new_encode_dev(stat->dev); |
469 | tmp.st_rdev = new_encode_dev(stat->rdev); | |
470 | #else | |
471 | tmp.st_dev = huge_encode_dev(stat->dev); | |
472 | tmp.st_rdev = huge_encode_dev(stat->rdev); | |
473 | #endif | |
474 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
475 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
476 | return -EOVERFLOW; | |
1da177e4 LT |
477 | #ifdef STAT64_HAS_BROKEN_ST_INO |
478 | tmp.__st_ino = stat->ino; | |
479 | #endif | |
480 | tmp.st_mode = stat->mode; | |
481 | tmp.st_nlink = stat->nlink; | |
a7c1938e EB |
482 | tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
483 | tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
1da177e4 LT |
484 | tmp.st_atime = stat->atime.tv_sec; |
485 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
486 | tmp.st_mtime = stat->mtime.tv_sec; | |
487 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
488 | tmp.st_ctime = stat->ctime.tv_sec; | |
489 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
490 | tmp.st_size = stat->size; | |
491 | tmp.st_blocks = stat->blocks; | |
492 | tmp.st_blksize = stat->blksize; | |
493 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
494 | } | |
495 | ||
c7887325 DH |
496 | SYSCALL_DEFINE2(stat64, const char __user *, filename, |
497 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
498 | { |
499 | struct kstat stat; | |
500 | int error = vfs_stat(filename, &stat); | |
501 | ||
502 | if (!error) | |
503 | error = cp_new_stat64(&stat, statbuf); | |
504 | ||
505 | return error; | |
506 | } | |
257ac264 | 507 | |
c7887325 DH |
508 | SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
509 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
510 | { |
511 | struct kstat stat; | |
512 | int error = vfs_lstat(filename, &stat); | |
513 | ||
514 | if (!error) | |
515 | error = cp_new_stat64(&stat, statbuf); | |
516 | ||
517 | return error; | |
518 | } | |
257ac264 HC |
519 | |
520 | SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) | |
1da177e4 LT |
521 | { |
522 | struct kstat stat; | |
523 | int error = vfs_fstat(fd, &stat); | |
524 | ||
525 | if (!error) | |
526 | error = cp_new_stat64(&stat, statbuf); | |
527 | ||
528 | return error; | |
529 | } | |
530 | ||
c7887325 | 531 | SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
6559eed8 | 532 | struct stat64 __user *, statbuf, int, flag) |
cff2b760 UD |
533 | { |
534 | struct kstat stat; | |
0112fc22 | 535 | int error; |
cff2b760 | 536 | |
0112fc22 OD |
537 | error = vfs_fstatat(dfd, filename, &stat, flag); |
538 | if (error) | |
539 | return error; | |
540 | return cp_new_stat64(&stat, statbuf); | |
cff2b760 | 541 | } |
0753f70f | 542 | #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
1da177e4 | 543 | |
6f88cc17 | 544 | static noinline_for_stack int |
64bd7204 | 545 | cp_statx(const struct kstat *stat, struct statx __user *buffer) |
a528d35e | 546 | { |
64bd7204 EB |
547 | struct statx tmp; |
548 | ||
549 | memset(&tmp, 0, sizeof(tmp)); | |
550 | ||
551 | tmp.stx_mask = stat->result_mask; | |
552 | tmp.stx_blksize = stat->blksize; | |
553 | tmp.stx_attributes = stat->attributes; | |
554 | tmp.stx_nlink = stat->nlink; | |
555 | tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid); | |
556 | tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
557 | tmp.stx_mode = stat->mode; | |
558 | tmp.stx_ino = stat->ino; | |
559 | tmp.stx_size = stat->size; | |
560 | tmp.stx_blocks = stat->blocks; | |
3209f68b | 561 | tmp.stx_attributes_mask = stat->attributes_mask; |
64bd7204 EB |
562 | tmp.stx_atime.tv_sec = stat->atime.tv_sec; |
563 | tmp.stx_atime.tv_nsec = stat->atime.tv_nsec; | |
564 | tmp.stx_btime.tv_sec = stat->btime.tv_sec; | |
565 | tmp.stx_btime.tv_nsec = stat->btime.tv_nsec; | |
566 | tmp.stx_ctime.tv_sec = stat->ctime.tv_sec; | |
567 | tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec; | |
568 | tmp.stx_mtime.tv_sec = stat->mtime.tv_sec; | |
569 | tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec; | |
570 | tmp.stx_rdev_major = MAJOR(stat->rdev); | |
571 | tmp.stx_rdev_minor = MINOR(stat->rdev); | |
572 | tmp.stx_dev_major = MAJOR(stat->dev); | |
573 | tmp.stx_dev_minor = MINOR(stat->dev); | |
fa2fcf4f | 574 | tmp.stx_mnt_id = stat->mnt_id; |
64bd7204 EB |
575 | |
576 | return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
a528d35e DH |
577 | } |
578 | ||
0018784f BM |
579 | int do_statx(int dfd, const char __user *filename, unsigned flags, |
580 | unsigned int mask, struct statx __user *buffer) | |
581 | { | |
582 | struct kstat stat; | |
583 | int error; | |
584 | ||
585 | if (mask & STATX__RESERVED) | |
586 | return -EINVAL; | |
587 | if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) | |
588 | return -EINVAL; | |
589 | ||
590 | error = vfs_statx(dfd, filename, flags, &stat, mask); | |
591 | if (error) | |
592 | return error; | |
593 | ||
594 | return cp_statx(&stat, buffer); | |
595 | } | |
596 | ||
a528d35e DH |
597 | /** |
598 | * sys_statx - System call to get enhanced stats | |
599 | * @dfd: Base directory to pathwalk from *or* fd to stat. | |
1e2f82d1 | 600 | * @filename: File to stat or "" with AT_EMPTY_PATH |
a528d35e DH |
601 | * @flags: AT_* flags to control pathwalk. |
602 | * @mask: Parts of statx struct actually required. | |
603 | * @buffer: Result buffer. | |
604 | * | |
1e2f82d1 DH |
605 | * Note that fstat() can be emulated by setting dfd to the fd of interest, |
606 | * supplying "" as the filename and setting AT_EMPTY_PATH in the flags. | |
a528d35e DH |
607 | */ |
608 | SYSCALL_DEFINE5(statx, | |
609 | int, dfd, const char __user *, filename, unsigned, flags, | |
610 | unsigned int, mask, | |
611 | struct statx __user *, buffer) | |
612 | { | |
0018784f | 613 | return do_statx(dfd, filename, flags, mask, buffer); |
a528d35e DH |
614 | } |
615 | ||
ac565de3 AV |
616 | #ifdef CONFIG_COMPAT |
617 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) | |
618 | { | |
619 | struct compat_stat tmp; | |
620 | ||
621 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) | |
622 | return -EOVERFLOW; | |
623 | ||
624 | memset(&tmp, 0, sizeof(tmp)); | |
625 | tmp.st_dev = old_encode_dev(stat->dev); | |
626 | tmp.st_ino = stat->ino; | |
627 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) | |
628 | return -EOVERFLOW; | |
629 | tmp.st_mode = stat->mode; | |
630 | tmp.st_nlink = stat->nlink; | |
631 | if (tmp.st_nlink != stat->nlink) | |
632 | return -EOVERFLOW; | |
633 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); | |
634 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
635 | tmp.st_rdev = old_encode_dev(stat->rdev); | |
636 | if ((u64) stat->size > MAX_NON_LFS) | |
637 | return -EOVERFLOW; | |
638 | tmp.st_size = stat->size; | |
639 | tmp.st_atime = stat->atime.tv_sec; | |
640 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
641 | tmp.st_mtime = stat->mtime.tv_sec; | |
642 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
643 | tmp.st_ctime = stat->ctime.tv_sec; | |
644 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
645 | tmp.st_blocks = stat->blocks; | |
646 | tmp.st_blksize = stat->blksize; | |
647 | return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
648 | } | |
649 | ||
650 | COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, | |
651 | struct compat_stat __user *, statbuf) | |
652 | { | |
653 | struct kstat stat; | |
654 | int error; | |
655 | ||
656 | error = vfs_stat(filename, &stat); | |
657 | if (error) | |
658 | return error; | |
659 | return cp_compat_stat(&stat, statbuf); | |
660 | } | |
661 | ||
662 | COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, | |
663 | struct compat_stat __user *, statbuf) | |
664 | { | |
665 | struct kstat stat; | |
666 | int error; | |
667 | ||
668 | error = vfs_lstat(filename, &stat); | |
669 | if (error) | |
670 | return error; | |
671 | return cp_compat_stat(&stat, statbuf); | |
672 | } | |
673 | ||
674 | #ifndef __ARCH_WANT_STAT64 | |
675 | COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, | |
676 | const char __user *, filename, | |
677 | struct compat_stat __user *, statbuf, int, flag) | |
678 | { | |
679 | struct kstat stat; | |
680 | int error; | |
681 | ||
682 | error = vfs_fstatat(dfd, filename, &stat, flag); | |
683 | if (error) | |
684 | return error; | |
685 | return cp_compat_stat(&stat, statbuf); | |
686 | } | |
687 | #endif | |
688 | ||
689 | COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, | |
690 | struct compat_stat __user *, statbuf) | |
691 | { | |
692 | struct kstat stat; | |
693 | int error = vfs_fstat(fd, &stat); | |
694 | ||
695 | if (!error) | |
696 | error = cp_compat_stat(&stat, statbuf); | |
697 | return error; | |
698 | } | |
699 | #endif | |
700 | ||
b462707e DM |
701 | /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
702 | void __inode_add_bytes(struct inode *inode, loff_t bytes) | |
1da177e4 | 703 | { |
1da177e4 LT |
704 | inode->i_blocks += bytes >> 9; |
705 | bytes &= 511; | |
706 | inode->i_bytes += bytes; | |
707 | if (inode->i_bytes >= 512) { | |
708 | inode->i_blocks++; | |
709 | inode->i_bytes -= 512; | |
710 | } | |
b462707e | 711 | } |
eb315d2a | 712 | EXPORT_SYMBOL(__inode_add_bytes); |
b462707e DM |
713 | |
714 | void inode_add_bytes(struct inode *inode, loff_t bytes) | |
715 | { | |
716 | spin_lock(&inode->i_lock); | |
717 | __inode_add_bytes(inode, bytes); | |
1da177e4 LT |
718 | spin_unlock(&inode->i_lock); |
719 | } | |
720 | ||
721 | EXPORT_SYMBOL(inode_add_bytes); | |
722 | ||
1c8924eb | 723 | void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
1da177e4 | 724 | { |
1da177e4 LT |
725 | inode->i_blocks -= bytes >> 9; |
726 | bytes &= 511; | |
727 | if (inode->i_bytes < bytes) { | |
728 | inode->i_blocks--; | |
729 | inode->i_bytes += 512; | |
730 | } | |
731 | inode->i_bytes -= bytes; | |
1c8924eb JK |
732 | } |
733 | ||
734 | EXPORT_SYMBOL(__inode_sub_bytes); | |
735 | ||
736 | void inode_sub_bytes(struct inode *inode, loff_t bytes) | |
737 | { | |
738 | spin_lock(&inode->i_lock); | |
739 | __inode_sub_bytes(inode, bytes); | |
1da177e4 LT |
740 | spin_unlock(&inode->i_lock); |
741 | } | |
742 | ||
743 | EXPORT_SYMBOL(inode_sub_bytes); | |
744 | ||
745 | loff_t inode_get_bytes(struct inode *inode) | |
746 | { | |
747 | loff_t ret; | |
748 | ||
749 | spin_lock(&inode->i_lock); | |
f4a8116a | 750 | ret = __inode_get_bytes(inode); |
1da177e4 LT |
751 | spin_unlock(&inode->i_lock); |
752 | return ret; | |
753 | } | |
754 | ||
755 | EXPORT_SYMBOL(inode_get_bytes); | |
756 | ||
757 | void inode_set_bytes(struct inode *inode, loff_t bytes) | |
758 | { | |
759 | /* Caller is here responsible for sufficient locking | |
760 | * (ie. inode->i_lock) */ | |
761 | inode->i_blocks = bytes >> 9; | |
762 | inode->i_bytes = bytes & 511; | |
763 | } | |
764 | ||
765 | EXPORT_SYMBOL(inode_set_bytes); |