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 | 88 | stat->result_mask &= ~STATX_ATIME; |
5afa7e8b TT |
89 | |
90 | /* | |
91 | * Note: If you add another clause to set an attribute flag, please | |
92 | * update attributes_mask below. | |
93 | */ | |
801e5237 CH |
94 | if (IS_AUTOMOUNT(inode)) |
95 | stat->attributes |= STATX_ATTR_AUTOMOUNT; | |
96 | ||
712b2698 IW |
97 | if (IS_DAX(inode)) |
98 | stat->attributes |= STATX_ATTR_DAX; | |
99 | ||
5afa7e8b TT |
100 | stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT | |
101 | STATX_ATTR_DAX); | |
102 | ||
549c7297 | 103 | mnt_userns = mnt_user_ns(path->mnt); |
1da177e4 | 104 | if (inode->i_op->getattr) |
549c7297 CB |
105 | return inode->i_op->getattr(mnt_userns, path, stat, |
106 | request_mask, query_flags); | |
1da177e4 | 107 | |
549c7297 | 108 | generic_fillattr(mnt_userns, inode, stat); |
1da177e4 LT |
109 | return 0; |
110 | } | |
b7a6ec52 BF |
111 | EXPORT_SYMBOL(vfs_getattr_nosec); |
112 | ||
a528d35e DH |
113 | /* |
114 | * vfs_getattr - Get the enhanced basic attributes of a file | |
115 | * @path: The file of interest | |
116 | * @stat: Where to return the statistics | |
117 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
f2d077ff | 118 | * @query_flags: Query mode (AT_STATX_SYNC_TYPE) |
a528d35e DH |
119 | * |
120 | * Ask the filesystem for a file's attributes. The caller must indicate in | |
121 | * request_mask and query_flags to indicate what they want. | |
122 | * | |
123 | * If the file is remote, the filesystem can be forced to update the attributes | |
124 | * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can | |
125 | * suppress the update by passing AT_STATX_DONT_SYNC. | |
126 | * | |
127 | * Bits must have been set in request_mask to indicate which attributes the | |
128 | * caller wants retrieving. Any such attribute not requested may be returned | |
129 | * anyway, but the value may be approximate, and, if remote, may not have been | |
130 | * synchronised with the server. | |
131 | * | |
132 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
133 | */ | |
134 | int vfs_getattr(const struct path *path, struct kstat *stat, | |
135 | u32 request_mask, unsigned int query_flags) | |
b7a6ec52 BF |
136 | { |
137 | int retval; | |
138 | ||
3f7036a0 | 139 | retval = security_inode_getattr(path); |
b7a6ec52 BF |
140 | if (retval) |
141 | return retval; | |
a528d35e | 142 | return vfs_getattr_nosec(path, stat, request_mask, query_flags); |
b7a6ec52 | 143 | } |
1da177e4 LT |
144 | EXPORT_SYMBOL(vfs_getattr); |
145 | ||
a528d35e | 146 | /** |
da9aa5d9 | 147 | * vfs_fstat - Get the basic attributes by file descriptor |
a528d35e DH |
148 | * @fd: The file descriptor referring to the file of interest |
149 | * @stat: The result structure to fill in. | |
a528d35e DH |
150 | * |
151 | * This function is a wrapper around vfs_getattr(). The main difference is | |
152 | * that it uses a file descriptor to determine the file location. | |
153 | * | |
154 | * 0 will be returned on success, and a -ve error code if unsuccessful. | |
155 | */ | |
da9aa5d9 | 156 | int vfs_fstat(int fd, struct kstat *stat) |
1da177e4 | 157 | { |
8c7493aa | 158 | struct fd f; |
da9aa5d9 | 159 | int error; |
8c7493aa EB |
160 | |
161 | f = fdget_raw(fd); | |
da9aa5d9 CH |
162 | if (!f.file) |
163 | return -EBADF; | |
164 | error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0); | |
165 | fdput(f); | |
1da177e4 LT |
166 | return error; |
167 | } | |
1da177e4 | 168 | |
a528d35e DH |
169 | /** |
170 | * vfs_statx - Get basic and extra attributes by filename | |
171 | * @dfd: A file descriptor representing the base dir for a relative filename | |
172 | * @filename: The name of the file of interest | |
173 | * @flags: Flags to control the query | |
174 | * @stat: The result structure to fill in. | |
175 | * @request_mask: STATX_xxx flags indicating what the caller wants | |
176 | * | |
177 | * This function is a wrapper around vfs_getattr(). The main difference is | |
178 | * that it uses a filename and base directory to determine the file location. | |
179 | * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink | |
180 | * at the given name from being referenced. | |
181 | * | |
a528d35e DH |
182 | * 0 will be returned on success, and a -ve error code if unsuccessful. |
183 | */ | |
09f1bde4 | 184 | static int vfs_statx(int dfd, const char __user *filename, int flags, |
a528d35e | 185 | struct kstat *stat, u32 request_mask) |
0112fc22 | 186 | { |
2eae7a18 | 187 | struct path path; |
b3f05150 CH |
188 | unsigned lookup_flags = 0; |
189 | int error; | |
0112fc22 | 190 | |
b3f05150 | 191 | if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH | |
f2d077ff | 192 | AT_STATX_SYNC_TYPE)) |
a528d35e | 193 | return -EINVAL; |
b3f05150 CH |
194 | |
195 | if (!(flags & AT_SYMLINK_NOFOLLOW)) | |
196 | lookup_flags |= LOOKUP_FOLLOW; | |
197 | if (!(flags & AT_NO_AUTOMOUNT)) | |
198 | lookup_flags |= LOOKUP_AUTOMOUNT; | |
199 | if (flags & AT_EMPTY_PATH) | |
200 | lookup_flags |= LOOKUP_EMPTY; | |
201 | ||
836fb7e7 | 202 | retry: |
2eae7a18 CH |
203 | error = user_path_at(dfd, filename, lookup_flags, &path); |
204 | if (error) | |
205 | goto out; | |
206 | ||
a528d35e | 207 | error = vfs_getattr(&path, stat, request_mask, flags); |
fa2fcf4f MS |
208 | stat->mnt_id = real_mount(path.mnt)->mnt_id; |
209 | stat->result_mask |= STATX_MNT_ID; | |
80340fe3 MS |
210 | if (path.mnt->mnt_root == path.dentry) |
211 | stat->attributes |= STATX_ATTR_MOUNT_ROOT; | |
212 | stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT; | |
2eae7a18 | 213 | path_put(&path); |
836fb7e7 JL |
214 | if (retry_estale(error, lookup_flags)) { |
215 | lookup_flags |= LOOKUP_REVAL; | |
216 | goto retry; | |
217 | } | |
0112fc22 OD |
218 | out: |
219 | return error; | |
220 | } | |
2eae7a18 | 221 | |
09f1bde4 CH |
222 | int vfs_fstatat(int dfd, const char __user *filename, |
223 | struct kstat *stat, int flags) | |
224 | { | |
225 | return vfs_statx(dfd, filename, flags | AT_NO_AUTOMOUNT, | |
226 | stat, STATX_BASIC_STATS); | |
227 | } | |
0112fc22 | 228 | |
1da177e4 LT |
229 | #ifdef __ARCH_WANT_OLD_STAT |
230 | ||
231 | /* | |
232 | * For backward compatibility? Maybe this should be moved | |
233 | * into arch/i386 instead? | |
234 | */ | |
235 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) | |
236 | { | |
237 | static int warncount = 5; | |
238 | struct __old_kernel_stat tmp; | |
a528d35e | 239 | |
1da177e4 LT |
240 | if (warncount > 0) { |
241 | warncount--; | |
242 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", | |
243 | current->comm); | |
244 | } else if (warncount < 0) { | |
245 | /* it's laughable, but... */ | |
246 | warncount = 0; | |
247 | } | |
248 | ||
249 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); | |
250 | tmp.st_dev = old_encode_dev(stat->dev); | |
251 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
252 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
253 | return -EOVERFLOW; | |
1da177e4 LT |
254 | tmp.st_mode = stat->mode; |
255 | tmp.st_nlink = stat->nlink; | |
256 | if (tmp.st_nlink != stat->nlink) | |
257 | return -EOVERFLOW; | |
a7c1938e EB |
258 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
259 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
1da177e4 LT |
260 | tmp.st_rdev = old_encode_dev(stat->rdev); |
261 | #if BITS_PER_LONG == 32 | |
262 | if (stat->size > MAX_NON_LFS) | |
263 | return -EOVERFLOW; | |
a528d35e | 264 | #endif |
1da177e4 LT |
265 | tmp.st_size = stat->size; |
266 | tmp.st_atime = stat->atime.tv_sec; | |
267 | tmp.st_mtime = stat->mtime.tv_sec; | |
268 | tmp.st_ctime = stat->ctime.tv_sec; | |
269 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
270 | } | |
271 | ||
c7887325 DH |
272 | SYSCALL_DEFINE2(stat, const char __user *, filename, |
273 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
274 | { |
275 | struct kstat stat; | |
2eae7a18 | 276 | int error; |
1da177e4 | 277 | |
2eae7a18 CH |
278 | error = vfs_stat(filename, &stat); |
279 | if (error) | |
280 | return error; | |
1da177e4 | 281 | |
2eae7a18 | 282 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 283 | } |
257ac264 | 284 | |
c7887325 DH |
285 | SYSCALL_DEFINE2(lstat, const char __user *, filename, |
286 | struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
287 | { |
288 | struct kstat stat; | |
2eae7a18 | 289 | int error; |
1da177e4 | 290 | |
2eae7a18 CH |
291 | error = vfs_lstat(filename, &stat); |
292 | if (error) | |
293 | return error; | |
1da177e4 | 294 | |
2eae7a18 | 295 | return cp_old_stat(&stat, statbuf); |
1da177e4 | 296 | } |
257ac264 HC |
297 | |
298 | SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) | |
1da177e4 LT |
299 | { |
300 | struct kstat stat; | |
301 | int error = vfs_fstat(fd, &stat); | |
302 | ||
303 | if (!error) | |
304 | error = cp_old_stat(&stat, statbuf); | |
305 | ||
306 | return error; | |
307 | } | |
308 | ||
309 | #endif /* __ARCH_WANT_OLD_STAT */ | |
310 | ||
82b355d1 AB |
311 | #ifdef __ARCH_WANT_NEW_STAT |
312 | ||
a52dd971 LT |
313 | #if BITS_PER_LONG == 32 |
314 | # define choose_32_64(a,b) a | |
315 | #else | |
316 | # define choose_32_64(a,b) b | |
317 | #endif | |
318 | ||
4c416f42 | 319 | #define valid_dev(x) choose_32_64(old_valid_dev(x),true) |
a52dd971 LT |
320 | #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) |
321 | ||
8529f613 LT |
322 | #ifndef INIT_STRUCT_STAT_PADDING |
323 | # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) | |
324 | #endif | |
325 | ||
1da177e4 LT |
326 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
327 | { | |
328 | struct stat tmp; | |
329 | ||
a52dd971 | 330 | if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) |
1da177e4 | 331 | return -EOVERFLOW; |
a52dd971 LT |
332 | #if BITS_PER_LONG == 32 |
333 | if (stat->size > MAX_NON_LFS) | |
1da177e4 LT |
334 | return -EOVERFLOW; |
335 | #endif | |
336 | ||
8529f613 | 337 | INIT_STRUCT_STAT_PADDING(tmp); |
a52dd971 | 338 | tmp.st_dev = encode_dev(stat->dev); |
1da177e4 | 339 | tmp.st_ino = stat->ino; |
afefdbb2 DH |
340 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
341 | return -EOVERFLOW; | |
1da177e4 LT |
342 | tmp.st_mode = stat->mode; |
343 | tmp.st_nlink = stat->nlink; | |
344 | if (tmp.st_nlink != stat->nlink) | |
345 | return -EOVERFLOW; | |
a7c1938e EB |
346 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
347 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
a52dd971 | 348 | tmp.st_rdev = encode_dev(stat->rdev); |
1da177e4 LT |
349 | tmp.st_size = stat->size; |
350 | tmp.st_atime = stat->atime.tv_sec; | |
351 | tmp.st_mtime = stat->mtime.tv_sec; | |
352 | tmp.st_ctime = stat->ctime.tv_sec; | |
353 | #ifdef STAT_HAVE_NSEC | |
354 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
355 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
356 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
357 | #endif | |
358 | tmp.st_blocks = stat->blocks; | |
359 | tmp.st_blksize = stat->blksize; | |
360 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
361 | } | |
362 | ||
c7887325 DH |
363 | SYSCALL_DEFINE2(newstat, const char __user *, filename, |
364 | struct stat __user *, statbuf) | |
5590ff0d UD |
365 | { |
366 | struct kstat stat; | |
2eae7a18 | 367 | int error = vfs_stat(filename, &stat); |
5590ff0d | 368 | |
2eae7a18 CH |
369 | if (error) |
370 | return error; | |
371 | return cp_new_stat(&stat, statbuf); | |
5590ff0d UD |
372 | } |
373 | ||
c7887325 DH |
374 | SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
375 | struct stat __user *, statbuf) | |
1da177e4 LT |
376 | { |
377 | struct kstat stat; | |
2eae7a18 | 378 | int error; |
1da177e4 | 379 | |
2eae7a18 CH |
380 | error = vfs_lstat(filename, &stat); |
381 | if (error) | |
382 | return error; | |
1da177e4 | 383 | |
2eae7a18 | 384 | return cp_new_stat(&stat, statbuf); |
1da177e4 | 385 | } |
5590ff0d | 386 | |
2833c28a | 387 | #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
c7887325 | 388 | SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
6559eed8 | 389 | struct stat __user *, statbuf, int, flag) |
1da177e4 LT |
390 | { |
391 | struct kstat stat; | |
0112fc22 | 392 | int error; |
1da177e4 | 393 | |
0112fc22 OD |
394 | error = vfs_fstatat(dfd, filename, &stat, flag); |
395 | if (error) | |
396 | return error; | |
397 | return cp_new_stat(&stat, statbuf); | |
1da177e4 | 398 | } |
cff2b760 | 399 | #endif |
5590ff0d | 400 | |
257ac264 | 401 | SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
1da177e4 LT |
402 | { |
403 | struct kstat stat; | |
404 | int error = vfs_fstat(fd, &stat); | |
405 | ||
406 | if (!error) | |
407 | error = cp_new_stat(&stat, statbuf); | |
408 | ||
409 | return error; | |
410 | } | |
82b355d1 | 411 | #endif |
1da177e4 | 412 | |
2dae0248 DB |
413 | static int do_readlinkat(int dfd, const char __user *pathname, |
414 | char __user *buf, int bufsiz) | |
1da177e4 | 415 | { |
2d8f3038 | 416 | struct path path; |
1da177e4 | 417 | int error; |
1fa1e7f6 | 418 | int empty = 0; |
7955119e | 419 | unsigned int lookup_flags = LOOKUP_EMPTY; |
1da177e4 LT |
420 | |
421 | if (bufsiz <= 0) | |
422 | return -EINVAL; | |
423 | ||
7955119e JL |
424 | retry: |
425 | error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); | |
1da177e4 | 426 | if (!error) { |
bb668734 | 427 | struct inode *inode = d_backing_inode(path.dentry); |
1da177e4 | 428 | |
1fa1e7f6 | 429 | error = empty ? -ENOENT : -EINVAL; |
fd4a0edf MS |
430 | /* |
431 | * AFS mountpoints allow readlink(2) but are not symlinks | |
432 | */ | |
433 | if (d_is_symlink(path.dentry) || inode->i_op->readlink) { | |
2d8f3038 | 434 | error = security_inode_readlink(path.dentry); |
1da177e4 | 435 | if (!error) { |
68ac1234 | 436 | touch_atime(&path); |
fd4a0edf | 437 | error = vfs_readlink(path.dentry, buf, bufsiz); |
1da177e4 LT |
438 | } |
439 | } | |
2d8f3038 | 440 | path_put(&path); |
7955119e JL |
441 | if (retry_estale(error, lookup_flags)) { |
442 | lookup_flags |= LOOKUP_REVAL; | |
443 | goto retry; | |
444 | } | |
1da177e4 LT |
445 | } |
446 | return error; | |
447 | } | |
448 | ||
2dae0248 DB |
449 | SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
450 | char __user *, buf, int, bufsiz) | |
451 | { | |
452 | return do_readlinkat(dfd, pathname, buf, bufsiz); | |
453 | } | |
454 | ||
002c8976 HC |
455 | SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
456 | int, bufsiz) | |
5590ff0d | 457 | { |
2dae0248 | 458 | return do_readlinkat(AT_FDCWD, path, buf, bufsiz); |
5590ff0d UD |
459 | } |
460 | ||
1da177e4 LT |
461 | |
462 | /* ---------- LFS-64 ----------- */ | |
0753f70f | 463 | #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
1da177e4 | 464 | |
8529f613 LT |
465 | #ifndef INIT_STRUCT_STAT64_PADDING |
466 | # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) | |
467 | #endif | |
468 | ||
1da177e4 LT |
469 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
470 | { | |
471 | struct stat64 tmp; | |
472 | ||
8529f613 | 473 | INIT_STRUCT_STAT64_PADDING(tmp); |
1da177e4 LT |
474 | #ifdef CONFIG_MIPS |
475 | /* mips has weird padding, so we don't get 64 bits there */ | |
1da177e4 LT |
476 | tmp.st_dev = new_encode_dev(stat->dev); |
477 | tmp.st_rdev = new_encode_dev(stat->rdev); | |
478 | #else | |
479 | tmp.st_dev = huge_encode_dev(stat->dev); | |
480 | tmp.st_rdev = huge_encode_dev(stat->rdev); | |
481 | #endif | |
482 | tmp.st_ino = stat->ino; | |
afefdbb2 DH |
483 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
484 | return -EOVERFLOW; | |
1da177e4 LT |
485 | #ifdef STAT64_HAS_BROKEN_ST_INO |
486 | tmp.__st_ino = stat->ino; | |
487 | #endif | |
488 | tmp.st_mode = stat->mode; | |
489 | tmp.st_nlink = stat->nlink; | |
a7c1938e EB |
490 | tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
491 | tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
1da177e4 LT |
492 | tmp.st_atime = stat->atime.tv_sec; |
493 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
494 | tmp.st_mtime = stat->mtime.tv_sec; | |
495 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
496 | tmp.st_ctime = stat->ctime.tv_sec; | |
497 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
498 | tmp.st_size = stat->size; | |
499 | tmp.st_blocks = stat->blocks; | |
500 | tmp.st_blksize = stat->blksize; | |
501 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
502 | } | |
503 | ||
c7887325 DH |
504 | SYSCALL_DEFINE2(stat64, const char __user *, filename, |
505 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
506 | { |
507 | struct kstat stat; | |
508 | int error = vfs_stat(filename, &stat); | |
509 | ||
510 | if (!error) | |
511 | error = cp_new_stat64(&stat, statbuf); | |
512 | ||
513 | return error; | |
514 | } | |
257ac264 | 515 | |
c7887325 DH |
516 | SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
517 | struct stat64 __user *, statbuf) | |
1da177e4 LT |
518 | { |
519 | struct kstat stat; | |
520 | int error = vfs_lstat(filename, &stat); | |
521 | ||
522 | if (!error) | |
523 | error = cp_new_stat64(&stat, statbuf); | |
524 | ||
525 | return error; | |
526 | } | |
257ac264 HC |
527 | |
528 | SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) | |
1da177e4 LT |
529 | { |
530 | struct kstat stat; | |
531 | int error = vfs_fstat(fd, &stat); | |
532 | ||
533 | if (!error) | |
534 | error = cp_new_stat64(&stat, statbuf); | |
535 | ||
536 | return error; | |
537 | } | |
538 | ||
c7887325 | 539 | SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
6559eed8 | 540 | struct stat64 __user *, statbuf, int, flag) |
cff2b760 UD |
541 | { |
542 | struct kstat stat; | |
0112fc22 | 543 | int error; |
cff2b760 | 544 | |
0112fc22 OD |
545 | error = vfs_fstatat(dfd, filename, &stat, flag); |
546 | if (error) | |
547 | return error; | |
548 | return cp_new_stat64(&stat, statbuf); | |
cff2b760 | 549 | } |
0753f70f | 550 | #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
1da177e4 | 551 | |
6f88cc17 | 552 | static noinline_for_stack int |
64bd7204 | 553 | cp_statx(const struct kstat *stat, struct statx __user *buffer) |
a528d35e | 554 | { |
64bd7204 EB |
555 | struct statx tmp; |
556 | ||
557 | memset(&tmp, 0, sizeof(tmp)); | |
558 | ||
559 | tmp.stx_mask = stat->result_mask; | |
560 | tmp.stx_blksize = stat->blksize; | |
561 | tmp.stx_attributes = stat->attributes; | |
562 | tmp.stx_nlink = stat->nlink; | |
563 | tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid); | |
564 | tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
565 | tmp.stx_mode = stat->mode; | |
566 | tmp.stx_ino = stat->ino; | |
567 | tmp.stx_size = stat->size; | |
568 | tmp.stx_blocks = stat->blocks; | |
3209f68b | 569 | tmp.stx_attributes_mask = stat->attributes_mask; |
64bd7204 EB |
570 | tmp.stx_atime.tv_sec = stat->atime.tv_sec; |
571 | tmp.stx_atime.tv_nsec = stat->atime.tv_nsec; | |
572 | tmp.stx_btime.tv_sec = stat->btime.tv_sec; | |
573 | tmp.stx_btime.tv_nsec = stat->btime.tv_nsec; | |
574 | tmp.stx_ctime.tv_sec = stat->ctime.tv_sec; | |
575 | tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec; | |
576 | tmp.stx_mtime.tv_sec = stat->mtime.tv_sec; | |
577 | tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec; | |
578 | tmp.stx_rdev_major = MAJOR(stat->rdev); | |
579 | tmp.stx_rdev_minor = MINOR(stat->rdev); | |
580 | tmp.stx_dev_major = MAJOR(stat->dev); | |
581 | tmp.stx_dev_minor = MINOR(stat->dev); | |
fa2fcf4f | 582 | tmp.stx_mnt_id = stat->mnt_id; |
64bd7204 EB |
583 | |
584 | return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
a528d35e DH |
585 | } |
586 | ||
0018784f BM |
587 | int do_statx(int dfd, const char __user *filename, unsigned flags, |
588 | unsigned int mask, struct statx __user *buffer) | |
589 | { | |
590 | struct kstat stat; | |
591 | int error; | |
592 | ||
593 | if (mask & STATX__RESERVED) | |
594 | return -EINVAL; | |
595 | if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) | |
596 | return -EINVAL; | |
597 | ||
598 | error = vfs_statx(dfd, filename, flags, &stat, mask); | |
599 | if (error) | |
600 | return error; | |
601 | ||
602 | return cp_statx(&stat, buffer); | |
603 | } | |
604 | ||
a528d35e DH |
605 | /** |
606 | * sys_statx - System call to get enhanced stats | |
607 | * @dfd: Base directory to pathwalk from *or* fd to stat. | |
1e2f82d1 | 608 | * @filename: File to stat or "" with AT_EMPTY_PATH |
a528d35e DH |
609 | * @flags: AT_* flags to control pathwalk. |
610 | * @mask: Parts of statx struct actually required. | |
611 | * @buffer: Result buffer. | |
612 | * | |
1e2f82d1 DH |
613 | * Note that fstat() can be emulated by setting dfd to the fd of interest, |
614 | * supplying "" as the filename and setting AT_EMPTY_PATH in the flags. | |
a528d35e DH |
615 | */ |
616 | SYSCALL_DEFINE5(statx, | |
617 | int, dfd, const char __user *, filename, unsigned, flags, | |
618 | unsigned int, mask, | |
619 | struct statx __user *, buffer) | |
620 | { | |
0018784f | 621 | return do_statx(dfd, filename, flags, mask, buffer); |
a528d35e DH |
622 | } |
623 | ||
ac565de3 AV |
624 | #ifdef CONFIG_COMPAT |
625 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) | |
626 | { | |
627 | struct compat_stat tmp; | |
628 | ||
629 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) | |
630 | return -EOVERFLOW; | |
631 | ||
632 | memset(&tmp, 0, sizeof(tmp)); | |
633 | tmp.st_dev = old_encode_dev(stat->dev); | |
634 | tmp.st_ino = stat->ino; | |
635 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) | |
636 | return -EOVERFLOW; | |
637 | tmp.st_mode = stat->mode; | |
638 | tmp.st_nlink = stat->nlink; | |
639 | if (tmp.st_nlink != stat->nlink) | |
640 | return -EOVERFLOW; | |
641 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); | |
642 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
643 | tmp.st_rdev = old_encode_dev(stat->rdev); | |
644 | if ((u64) stat->size > MAX_NON_LFS) | |
645 | return -EOVERFLOW; | |
646 | tmp.st_size = stat->size; | |
647 | tmp.st_atime = stat->atime.tv_sec; | |
648 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
649 | tmp.st_mtime = stat->mtime.tv_sec; | |
650 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
651 | tmp.st_ctime = stat->ctime.tv_sec; | |
652 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
653 | tmp.st_blocks = stat->blocks; | |
654 | tmp.st_blksize = stat->blksize; | |
655 | return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
656 | } | |
657 | ||
658 | COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, | |
659 | struct compat_stat __user *, statbuf) | |
660 | { | |
661 | struct kstat stat; | |
662 | int error; | |
663 | ||
664 | error = vfs_stat(filename, &stat); | |
665 | if (error) | |
666 | return error; | |
667 | return cp_compat_stat(&stat, statbuf); | |
668 | } | |
669 | ||
670 | COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, | |
671 | struct compat_stat __user *, statbuf) | |
672 | { | |
673 | struct kstat stat; | |
674 | int error; | |
675 | ||
676 | error = vfs_lstat(filename, &stat); | |
677 | if (error) | |
678 | return error; | |
679 | return cp_compat_stat(&stat, statbuf); | |
680 | } | |
681 | ||
682 | #ifndef __ARCH_WANT_STAT64 | |
683 | COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, | |
684 | const char __user *, filename, | |
685 | struct compat_stat __user *, statbuf, int, flag) | |
686 | { | |
687 | struct kstat stat; | |
688 | int error; | |
689 | ||
690 | error = vfs_fstatat(dfd, filename, &stat, flag); | |
691 | if (error) | |
692 | return error; | |
693 | return cp_compat_stat(&stat, statbuf); | |
694 | } | |
695 | #endif | |
696 | ||
697 | COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, | |
698 | struct compat_stat __user *, statbuf) | |
699 | { | |
700 | struct kstat stat; | |
701 | int error = vfs_fstat(fd, &stat); | |
702 | ||
703 | if (!error) | |
704 | error = cp_compat_stat(&stat, statbuf); | |
705 | return error; | |
706 | } | |
707 | #endif | |
708 | ||
b462707e DM |
709 | /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
710 | void __inode_add_bytes(struct inode *inode, loff_t bytes) | |
1da177e4 | 711 | { |
1da177e4 LT |
712 | inode->i_blocks += bytes >> 9; |
713 | bytes &= 511; | |
714 | inode->i_bytes += bytes; | |
715 | if (inode->i_bytes >= 512) { | |
716 | inode->i_blocks++; | |
717 | inode->i_bytes -= 512; | |
718 | } | |
b462707e | 719 | } |
eb315d2a | 720 | EXPORT_SYMBOL(__inode_add_bytes); |
b462707e DM |
721 | |
722 | void inode_add_bytes(struct inode *inode, loff_t bytes) | |
723 | { | |
724 | spin_lock(&inode->i_lock); | |
725 | __inode_add_bytes(inode, bytes); | |
1da177e4 LT |
726 | spin_unlock(&inode->i_lock); |
727 | } | |
728 | ||
729 | EXPORT_SYMBOL(inode_add_bytes); | |
730 | ||
1c8924eb | 731 | void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
1da177e4 | 732 | { |
1da177e4 LT |
733 | inode->i_blocks -= bytes >> 9; |
734 | bytes &= 511; | |
735 | if (inode->i_bytes < bytes) { | |
736 | inode->i_blocks--; | |
737 | inode->i_bytes += 512; | |
738 | } | |
739 | inode->i_bytes -= bytes; | |
1c8924eb JK |
740 | } |
741 | ||
742 | EXPORT_SYMBOL(__inode_sub_bytes); | |
743 | ||
744 | void inode_sub_bytes(struct inode *inode, loff_t bytes) | |
745 | { | |
746 | spin_lock(&inode->i_lock); | |
747 | __inode_sub_bytes(inode, bytes); | |
1da177e4 LT |
748 | spin_unlock(&inode->i_lock); |
749 | } | |
750 | ||
751 | EXPORT_SYMBOL(inode_sub_bytes); | |
752 | ||
753 | loff_t inode_get_bytes(struct inode *inode) | |
754 | { | |
755 | loff_t ret; | |
756 | ||
757 | spin_lock(&inode->i_lock); | |
f4a8116a | 758 | ret = __inode_get_bytes(inode); |
1da177e4 LT |
759 | spin_unlock(&inode->i_lock); |
760 | return ret; | |
761 | } | |
762 | ||
763 | EXPORT_SYMBOL(inode_get_bytes); | |
764 | ||
765 | void inode_set_bytes(struct inode *inode, loff_t bytes) | |
766 | { | |
767 | /* Caller is here responsible for sufficient locking | |
768 | * (ie. inode->i_lock) */ | |
769 | inode->i_blocks = bytes >> 9; | |
770 | inode->i_bytes = bytes & 511; | |
771 | } | |
772 | ||
773 | EXPORT_SYMBOL(inode_set_bytes); |