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git.proxmox.com Git - mirror_ubuntu-bionic-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 <asm/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
= (1 << inode
->i_blkbits
);
35 stat
->blocks
= inode
->i_blocks
;
38 EXPORT_SYMBOL(generic_fillattr
);
40 int vfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
42 struct inode
*inode
= dentry
->d_inode
;
45 retval
= security_inode_getattr(mnt
, dentry
);
49 if (inode
->i_op
->getattr
)
50 return inode
->i_op
->getattr(mnt
, dentry
, stat
);
52 generic_fillattr(inode
, stat
);
56 EXPORT_SYMBOL(vfs_getattr
);
58 int vfs_fstat(unsigned int fd
, struct kstat
*stat
)
60 struct fd f
= fdget_raw(fd
);
64 error
= vfs_getattr(f
.file
->f_path
.mnt
, f
.file
->f_path
.dentry
,
70 EXPORT_SYMBOL(vfs_fstat
);
72 int vfs_fstatat(int dfd
, const char __user
*filename
, struct kstat
*stat
,
77 unsigned int lookup_flags
= 0;
79 if ((flag
& ~(AT_SYMLINK_NOFOLLOW
| AT_NO_AUTOMOUNT
|
83 if (!(flag
& AT_SYMLINK_NOFOLLOW
))
84 lookup_flags
|= LOOKUP_FOLLOW
;
85 if (flag
& AT_EMPTY_PATH
)
86 lookup_flags
|= LOOKUP_EMPTY
;
88 error
= user_path_at(dfd
, filename
, lookup_flags
, &path
);
92 error
= vfs_getattr(path
.mnt
, path
.dentry
, stat
);
94 if (retry_estale(error
, lookup_flags
)) {
95 lookup_flags
|= LOOKUP_REVAL
;
101 EXPORT_SYMBOL(vfs_fstatat
);
103 int vfs_stat(const char __user
*name
, struct kstat
*stat
)
105 return vfs_fstatat(AT_FDCWD
, name
, stat
, 0);
107 EXPORT_SYMBOL(vfs_stat
);
109 int vfs_lstat(const char __user
*name
, struct kstat
*stat
)
111 return vfs_fstatat(AT_FDCWD
, name
, stat
, AT_SYMLINK_NOFOLLOW
);
113 EXPORT_SYMBOL(vfs_lstat
);
116 #ifdef __ARCH_WANT_OLD_STAT
119 * For backward compatibility? Maybe this should be moved
120 * into arch/i386 instead?
122 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
124 static int warncount
= 5;
125 struct __old_kernel_stat tmp
;
129 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
131 } else if (warncount
< 0) {
132 /* it's laughable, but... */
136 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
137 tmp
.st_dev
= old_encode_dev(stat
->dev
);
138 tmp
.st_ino
= stat
->ino
;
139 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
141 tmp
.st_mode
= stat
->mode
;
142 tmp
.st_nlink
= stat
->nlink
;
143 if (tmp
.st_nlink
!= stat
->nlink
)
145 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
146 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
147 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
148 #if BITS_PER_LONG == 32
149 if (stat
->size
> MAX_NON_LFS
)
152 tmp
.st_size
= stat
->size
;
153 tmp
.st_atime
= stat
->atime
.tv_sec
;
154 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
155 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
156 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
159 SYSCALL_DEFINE2(stat
, const char __user
*, filename
,
160 struct __old_kernel_stat __user
*, statbuf
)
165 error
= vfs_stat(filename
, &stat
);
169 return cp_old_stat(&stat
, statbuf
);
172 SYSCALL_DEFINE2(lstat
, const char __user
*, filename
,
173 struct __old_kernel_stat __user
*, statbuf
)
178 error
= vfs_lstat(filename
, &stat
);
182 return cp_old_stat(&stat
, statbuf
);
185 SYSCALL_DEFINE2(fstat
, unsigned int, fd
, struct __old_kernel_stat __user
*, statbuf
)
188 int error
= vfs_fstat(fd
, &stat
);
191 error
= cp_old_stat(&stat
, statbuf
);
196 #endif /* __ARCH_WANT_OLD_STAT */
198 #if BITS_PER_LONG == 32
199 # define choose_32_64(a,b) a
201 # define choose_32_64(a,b) b
204 #define valid_dev(x) choose_32_64(old_valid_dev,new_valid_dev)(x)
205 #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
207 #ifndef INIT_STRUCT_STAT_PADDING
208 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
211 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
215 if (!valid_dev(stat
->dev
) || !valid_dev(stat
->rdev
))
217 #if BITS_PER_LONG == 32
218 if (stat
->size
> MAX_NON_LFS
)
222 INIT_STRUCT_STAT_PADDING(tmp
);
223 tmp
.st_dev
= encode_dev(stat
->dev
);
224 tmp
.st_ino
= stat
->ino
;
225 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
227 tmp
.st_mode
= stat
->mode
;
228 tmp
.st_nlink
= stat
->nlink
;
229 if (tmp
.st_nlink
!= stat
->nlink
)
231 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
232 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
233 tmp
.st_rdev
= encode_dev(stat
->rdev
);
234 tmp
.st_size
= stat
->size
;
235 tmp
.st_atime
= stat
->atime
.tv_sec
;
236 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
237 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
238 #ifdef STAT_HAVE_NSEC
239 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
240 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
241 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
243 tmp
.st_blocks
= stat
->blocks
;
244 tmp
.st_blksize
= stat
->blksize
;
245 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
248 SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
249 struct stat __user
*, statbuf
)
252 int error
= vfs_stat(filename
, &stat
);
256 return cp_new_stat(&stat
, statbuf
);
259 SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
260 struct stat __user
*, statbuf
)
265 error
= vfs_lstat(filename
, &stat
);
269 return cp_new_stat(&stat
, statbuf
);
272 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
273 SYSCALL_DEFINE4(newfstatat
, int, dfd
, const char __user
*, filename
,
274 struct stat __user
*, statbuf
, int, flag
)
279 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
282 return cp_new_stat(&stat
, statbuf
);
286 SYSCALL_DEFINE2(newfstat
, unsigned int, fd
, struct stat __user
*, statbuf
)
289 int error
= vfs_fstat(fd
, &stat
);
292 error
= cp_new_stat(&stat
, statbuf
);
297 SYSCALL_DEFINE4(readlinkat
, int, dfd
, const char __user
*, pathname
,
298 char __user
*, buf
, int, bufsiz
)
307 error
= user_path_at_empty(dfd
, pathname
, LOOKUP_EMPTY
, &path
, &empty
);
309 struct inode
*inode
= path
.dentry
->d_inode
;
311 error
= empty
? -ENOENT
: -EINVAL
;
312 if (inode
->i_op
->readlink
) {
313 error
= security_inode_readlink(path
.dentry
);
316 error
= inode
->i_op
->readlink(path
.dentry
,
325 SYSCALL_DEFINE3(readlink
, const char __user
*, path
, char __user
*, buf
,
328 return sys_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
332 /* ---------- LFS-64 ----------- */
333 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
335 #ifndef INIT_STRUCT_STAT64_PADDING
336 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
339 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
343 INIT_STRUCT_STAT64_PADDING(tmp
);
345 /* mips has weird padding, so we don't get 64 bits there */
346 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
348 tmp
.st_dev
= new_encode_dev(stat
->dev
);
349 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
351 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
352 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
354 tmp
.st_ino
= stat
->ino
;
355 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
357 #ifdef STAT64_HAS_BROKEN_ST_INO
358 tmp
.__st_ino
= stat
->ino
;
360 tmp
.st_mode
= stat
->mode
;
361 tmp
.st_nlink
= stat
->nlink
;
362 tmp
.st_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
363 tmp
.st_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
364 tmp
.st_atime
= stat
->atime
.tv_sec
;
365 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
366 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
367 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
368 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
369 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
370 tmp
.st_size
= stat
->size
;
371 tmp
.st_blocks
= stat
->blocks
;
372 tmp
.st_blksize
= stat
->blksize
;
373 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
376 SYSCALL_DEFINE2(stat64
, const char __user
*, filename
,
377 struct stat64 __user
*, statbuf
)
380 int error
= vfs_stat(filename
, &stat
);
383 error
= cp_new_stat64(&stat
, statbuf
);
388 SYSCALL_DEFINE2(lstat64
, const char __user
*, filename
,
389 struct stat64 __user
*, statbuf
)
392 int error
= vfs_lstat(filename
, &stat
);
395 error
= cp_new_stat64(&stat
, statbuf
);
400 SYSCALL_DEFINE2(fstat64
, unsigned long, fd
, struct stat64 __user
*, statbuf
)
403 int error
= vfs_fstat(fd
, &stat
);
406 error
= cp_new_stat64(&stat
, statbuf
);
411 SYSCALL_DEFINE4(fstatat64
, int, dfd
, const char __user
*, filename
,
412 struct stat64 __user
*, statbuf
, int, flag
)
417 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
420 return cp_new_stat64(&stat
, statbuf
);
422 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
424 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
425 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
)
427 inode
->i_blocks
+= bytes
>> 9;
429 inode
->i_bytes
+= bytes
;
430 if (inode
->i_bytes
>= 512) {
432 inode
->i_bytes
-= 512;
436 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
438 spin_lock(&inode
->i_lock
);
439 __inode_add_bytes(inode
, bytes
);
440 spin_unlock(&inode
->i_lock
);
443 EXPORT_SYMBOL(inode_add_bytes
);
445 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
447 spin_lock(&inode
->i_lock
);
448 inode
->i_blocks
-= bytes
>> 9;
450 if (inode
->i_bytes
< bytes
) {
452 inode
->i_bytes
+= 512;
454 inode
->i_bytes
-= bytes
;
455 spin_unlock(&inode
->i_lock
);
458 EXPORT_SYMBOL(inode_sub_bytes
);
460 loff_t
inode_get_bytes(struct inode
*inode
)
464 spin_lock(&inode
->i_lock
);
465 ret
= (((loff_t
)inode
->i_blocks
) << 9) + inode
->i_bytes
;
466 spin_unlock(&inode
->i_lock
);
470 EXPORT_SYMBOL(inode_get_bytes
);
472 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
474 /* Caller is here responsible for sufficient locking
475 * (ie. inode->i_lock) */
476 inode
->i_blocks
= bytes
>> 9;
477 inode
->i_bytes
= bytes
& 511;
480 EXPORT_SYMBOL(inode_set_bytes
);