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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - fs/stat.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/export.h>
9 #include <linux/errno.h>
10 #include <linux/file.h>
11 #include <linux/highuid.h>
13 #include <linux/namei.h>
14 #include <linux/security.h>
15 #include <linux/syscalls.h>
16 #include <linux/pagemap.h>
18 #include <linux/uaccess.h>
19 #include <asm/unistd.h>
21 void generic_fillattr(struct inode
*inode
, struct kstat
*stat
)
23 stat
->dev
= inode
->i_sb
->s_dev
;
24 stat
->ino
= inode
->i_ino
;
25 stat
->mode
= inode
->i_mode
;
26 stat
->nlink
= inode
->i_nlink
;
27 stat
->uid
= inode
->i_uid
;
28 stat
->gid
= inode
->i_gid
;
29 stat
->rdev
= inode
->i_rdev
;
30 stat
->size
= i_size_read(inode
);
31 stat
->atime
= inode
->i_atime
;
32 stat
->mtime
= inode
->i_mtime
;
33 stat
->ctime
= inode
->i_ctime
;
34 stat
->blksize
= i_blocksize(inode
);
35 stat
->blocks
= inode
->i_blocks
;
38 EXPORT_SYMBOL(generic_fillattr
);
41 * vfs_getattr_nosec - getattr without security checks
42 * @path: file to get attributes from
43 * @stat: structure to return attributes in
45 * Get attributes without calling security_inode_getattr.
47 * Currently the only caller other than vfs_getattr is internal to the
48 * filehandle lookup code, which uses only the inode number and returns
49 * no attributes to any user. Any other code probably wants
52 int vfs_getattr_nosec(struct path
*path
, struct kstat
*stat
)
54 struct inode
*inode
= d_backing_inode(path
->dentry
);
56 if (inode
->i_op
->getattr
)
57 return inode
->i_op
->getattr(path
->mnt
, path
->dentry
, stat
);
59 generic_fillattr(inode
, stat
);
63 EXPORT_SYMBOL(vfs_getattr_nosec
);
65 int vfs_getattr(struct path
*path
, struct kstat
*stat
)
69 retval
= security_inode_getattr(path
);
72 return vfs_getattr_nosec(path
, stat
);
75 EXPORT_SYMBOL(vfs_getattr
);
77 int vfs_fstat(unsigned int fd
, struct kstat
*stat
)
79 struct fd f
= fdget_raw(fd
);
83 error
= vfs_getattr(&f
.file
->f_path
, stat
);
88 EXPORT_SYMBOL(vfs_fstat
);
90 int vfs_fstatat(int dfd
, const char __user
*filename
, struct kstat
*stat
,
95 unsigned int lookup_flags
= 0;
97 if ((flag
& ~(AT_SYMLINK_NOFOLLOW
| AT_NO_AUTOMOUNT
|
101 if (!(flag
& AT_SYMLINK_NOFOLLOW
))
102 lookup_flags
|= LOOKUP_FOLLOW
;
103 if (flag
& AT_EMPTY_PATH
)
104 lookup_flags
|= LOOKUP_EMPTY
;
106 error
= user_path_at(dfd
, filename
, lookup_flags
, &path
);
110 error
= vfs_getattr(&path
, stat
);
112 if (retry_estale(error
, lookup_flags
)) {
113 lookup_flags
|= LOOKUP_REVAL
;
119 EXPORT_SYMBOL(vfs_fstatat
);
121 int vfs_stat(const char __user
*name
, struct kstat
*stat
)
123 return vfs_fstatat(AT_FDCWD
, name
, stat
, 0);
125 EXPORT_SYMBOL(vfs_stat
);
127 int vfs_lstat(const char __user
*name
, struct kstat
*stat
)
129 return vfs_fstatat(AT_FDCWD
, name
, stat
, AT_SYMLINK_NOFOLLOW
);
131 EXPORT_SYMBOL(vfs_lstat
);
134 #ifdef __ARCH_WANT_OLD_STAT
137 * For backward compatibility? Maybe this should be moved
138 * into arch/i386 instead?
140 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
142 static int warncount
= 5;
143 struct __old_kernel_stat tmp
;
147 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
149 } else if (warncount
< 0) {
150 /* it's laughable, but... */
154 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
155 tmp
.st_dev
= old_encode_dev(stat
->dev
);
156 tmp
.st_ino
= stat
->ino
;
157 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
159 tmp
.st_mode
= stat
->mode
;
160 tmp
.st_nlink
= stat
->nlink
;
161 if (tmp
.st_nlink
!= stat
->nlink
)
163 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
164 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
165 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
166 #if BITS_PER_LONG == 32
167 if (stat
->size
> MAX_NON_LFS
)
170 tmp
.st_size
= stat
->size
;
171 tmp
.st_atime
= stat
->atime
.tv_sec
;
172 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
173 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
174 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
177 SYSCALL_DEFINE2(stat
, const char __user
*, filename
,
178 struct __old_kernel_stat __user
*, statbuf
)
183 error
= vfs_stat(filename
, &stat
);
187 return cp_old_stat(&stat
, statbuf
);
190 SYSCALL_DEFINE2(lstat
, const char __user
*, filename
,
191 struct __old_kernel_stat __user
*, statbuf
)
196 error
= vfs_lstat(filename
, &stat
);
200 return cp_old_stat(&stat
, statbuf
);
203 SYSCALL_DEFINE2(fstat
, unsigned int, fd
, struct __old_kernel_stat __user
*, statbuf
)
206 int error
= vfs_fstat(fd
, &stat
);
209 error
= cp_old_stat(&stat
, statbuf
);
214 #endif /* __ARCH_WANT_OLD_STAT */
216 #if BITS_PER_LONG == 32
217 # define choose_32_64(a,b) a
219 # define choose_32_64(a,b) b
222 #define valid_dev(x) choose_32_64(old_valid_dev(x),true)
223 #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
225 #ifndef INIT_STRUCT_STAT_PADDING
226 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
229 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
233 if (!valid_dev(stat
->dev
) || !valid_dev(stat
->rdev
))
235 #if BITS_PER_LONG == 32
236 if (stat
->size
> MAX_NON_LFS
)
240 INIT_STRUCT_STAT_PADDING(tmp
);
241 tmp
.st_dev
= encode_dev(stat
->dev
);
242 tmp
.st_ino
= stat
->ino
;
243 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
245 tmp
.st_mode
= stat
->mode
;
246 tmp
.st_nlink
= stat
->nlink
;
247 if (tmp
.st_nlink
!= stat
->nlink
)
249 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
250 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
251 tmp
.st_rdev
= encode_dev(stat
->rdev
);
252 tmp
.st_size
= stat
->size
;
253 tmp
.st_atime
= stat
->atime
.tv_sec
;
254 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
255 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
256 #ifdef STAT_HAVE_NSEC
257 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
258 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
259 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
261 tmp
.st_blocks
= stat
->blocks
;
262 tmp
.st_blksize
= stat
->blksize
;
263 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
266 SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
267 struct stat __user
*, statbuf
)
270 int error
= vfs_stat(filename
, &stat
);
274 return cp_new_stat(&stat
, statbuf
);
277 SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
278 struct stat __user
*, statbuf
)
283 error
= vfs_lstat(filename
, &stat
);
287 return cp_new_stat(&stat
, statbuf
);
290 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
291 SYSCALL_DEFINE4(newfstatat
, int, dfd
, const char __user
*, filename
,
292 struct stat __user
*, statbuf
, int, flag
)
297 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
300 return cp_new_stat(&stat
, statbuf
);
304 SYSCALL_DEFINE2(newfstat
, unsigned int, fd
, struct stat __user
*, statbuf
)
307 int error
= vfs_fstat(fd
, &stat
);
310 error
= cp_new_stat(&stat
, statbuf
);
315 SYSCALL_DEFINE4(readlinkat
, int, dfd
, const char __user
*, pathname
,
316 char __user
*, buf
, int, bufsiz
)
321 unsigned int lookup_flags
= LOOKUP_EMPTY
;
327 error
= user_path_at_empty(dfd
, pathname
, lookup_flags
, &path
, &empty
);
329 struct inode
*inode
= d_backing_inode(path
.dentry
);
331 error
= empty
? -ENOENT
: -EINVAL
;
333 * AFS mountpoints allow readlink(2) but are not symlinks
335 if (d_is_symlink(path
.dentry
) || inode
->i_op
->readlink
) {
336 error
= security_inode_readlink(path
.dentry
);
339 error
= vfs_readlink(path
.dentry
, buf
, bufsiz
);
343 if (retry_estale(error
, lookup_flags
)) {
344 lookup_flags
|= LOOKUP_REVAL
;
351 SYSCALL_DEFINE3(readlink
, const char __user
*, path
, char __user
*, buf
,
354 return sys_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
358 /* ---------- LFS-64 ----------- */
359 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
361 #ifndef INIT_STRUCT_STAT64_PADDING
362 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
365 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
369 INIT_STRUCT_STAT64_PADDING(tmp
);
371 /* mips has weird padding, so we don't get 64 bits there */
372 tmp
.st_dev
= new_encode_dev(stat
->dev
);
373 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
375 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
376 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
378 tmp
.st_ino
= stat
->ino
;
379 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
381 #ifdef STAT64_HAS_BROKEN_ST_INO
382 tmp
.__st_ino
= stat
->ino
;
384 tmp
.st_mode
= stat
->mode
;
385 tmp
.st_nlink
= stat
->nlink
;
386 tmp
.st_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
387 tmp
.st_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
388 tmp
.st_atime
= stat
->atime
.tv_sec
;
389 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
390 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
391 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
392 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
393 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
394 tmp
.st_size
= stat
->size
;
395 tmp
.st_blocks
= stat
->blocks
;
396 tmp
.st_blksize
= stat
->blksize
;
397 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
400 SYSCALL_DEFINE2(stat64
, const char __user
*, filename
,
401 struct stat64 __user
*, statbuf
)
404 int error
= vfs_stat(filename
, &stat
);
407 error
= cp_new_stat64(&stat
, statbuf
);
412 SYSCALL_DEFINE2(lstat64
, const char __user
*, filename
,
413 struct stat64 __user
*, statbuf
)
416 int error
= vfs_lstat(filename
, &stat
);
419 error
= cp_new_stat64(&stat
, statbuf
);
424 SYSCALL_DEFINE2(fstat64
, unsigned long, fd
, struct stat64 __user
*, statbuf
)
427 int error
= vfs_fstat(fd
, &stat
);
430 error
= cp_new_stat64(&stat
, statbuf
);
435 SYSCALL_DEFINE4(fstatat64
, int, dfd
, const char __user
*, filename
,
436 struct stat64 __user
*, statbuf
, int, flag
)
441 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
444 return cp_new_stat64(&stat
, statbuf
);
446 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
448 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
449 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
)
451 inode
->i_blocks
+= bytes
>> 9;
453 inode
->i_bytes
+= bytes
;
454 if (inode
->i_bytes
>= 512) {
456 inode
->i_bytes
-= 512;
460 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
462 spin_lock(&inode
->i_lock
);
463 __inode_add_bytes(inode
, bytes
);
464 spin_unlock(&inode
->i_lock
);
467 EXPORT_SYMBOL(inode_add_bytes
);
469 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
471 inode
->i_blocks
-= bytes
>> 9;
473 if (inode
->i_bytes
< bytes
) {
475 inode
->i_bytes
+= 512;
477 inode
->i_bytes
-= bytes
;
480 EXPORT_SYMBOL(__inode_sub_bytes
);
482 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
484 spin_lock(&inode
->i_lock
);
485 __inode_sub_bytes(inode
, bytes
);
486 spin_unlock(&inode
->i_lock
);
489 EXPORT_SYMBOL(inode_sub_bytes
);
491 loff_t
inode_get_bytes(struct inode
*inode
)
495 spin_lock(&inode
->i_lock
);
496 ret
= (((loff_t
)inode
->i_blocks
) << 9) + inode
->i_bytes
;
497 spin_unlock(&inode
->i_lock
);
501 EXPORT_SYMBOL(inode_get_bytes
);
503 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
505 /* Caller is here responsible for sufficient locking
506 * (ie. inode->i_lock) */
507 inode
->i_blocks
= bytes
>> 9;
508 inode
->i_bytes
= bytes
& 511;
511 EXPORT_SYMBOL(inode_set_bytes
);