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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/config.h>
8 #include <linux/module.h>
10 #include <linux/errno.h>
11 #include <linux/file.h>
12 #include <linux/smp_lock.h>
13 #include <linux/highuid.h>
15 #include <linux/namei.h>
16 #include <linux/security.h>
17 #include <linux/syscalls.h>
19 #include <asm/uaccess.h>
20 #include <asm/unistd.h>
22 void generic_fillattr(struct inode
*inode
, struct kstat
*stat
)
24 stat
->dev
= inode
->i_sb
->s_dev
;
25 stat
->ino
= inode
->i_ino
;
26 stat
->mode
= inode
->i_mode
;
27 stat
->nlink
= inode
->i_nlink
;
28 stat
->uid
= inode
->i_uid
;
29 stat
->gid
= inode
->i_gid
;
30 stat
->rdev
= inode
->i_rdev
;
31 stat
->atime
= inode
->i_atime
;
32 stat
->mtime
= inode
->i_mtime
;
33 stat
->ctime
= inode
->i_ctime
;
34 stat
->size
= i_size_read(inode
);
35 stat
->blocks
= inode
->i_blocks
;
36 stat
->blksize
= inode
->i_blksize
;
39 EXPORT_SYMBOL(generic_fillattr
);
41 int vfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
43 struct inode
*inode
= dentry
->d_inode
;
46 retval
= security_inode_getattr(mnt
, dentry
);
50 if (inode
->i_op
->getattr
)
51 return inode
->i_op
->getattr(mnt
, dentry
, stat
);
53 generic_fillattr(inode
, stat
);
55 struct super_block
*s
= inode
->i_sb
;
57 blocks
= (stat
->size
+s
->s_blocksize
-1) >> s
->s_blocksize_bits
;
58 stat
->blocks
= (s
->s_blocksize
/ 512) * blocks
;
59 stat
->blksize
= s
->s_blocksize
;
64 EXPORT_SYMBOL(vfs_getattr
);
66 int vfs_stat_fd(int dfd
, char __user
*name
, struct kstat
*stat
)
71 error
= __user_walk_fd(dfd
, name
, LOOKUP_FOLLOW
, &nd
);
73 error
= vfs_getattr(nd
.mnt
, nd
.dentry
, stat
);
79 int vfs_stat(char __user
*name
, struct kstat
*stat
)
81 return vfs_stat_fd(AT_FDCWD
, name
, stat
);
84 EXPORT_SYMBOL(vfs_stat
);
86 int vfs_lstat_fd(int dfd
, char __user
*name
, struct kstat
*stat
)
91 error
= __user_walk_fd(dfd
, name
, 0, &nd
);
93 error
= vfs_getattr(nd
.mnt
, nd
.dentry
, stat
);
99 int vfs_lstat(char __user
*name
, struct kstat
*stat
)
101 return vfs_lstat_fd(AT_FDCWD
, name
, stat
);
104 EXPORT_SYMBOL(vfs_lstat
);
106 int vfs_fstat(unsigned int fd
, struct kstat
*stat
)
108 struct file
*f
= fget(fd
);
112 error
= vfs_getattr(f
->f_vfsmnt
, f
->f_dentry
, stat
);
118 EXPORT_SYMBOL(vfs_fstat
);
120 #ifdef __ARCH_WANT_OLD_STAT
123 * For backward compatibility? Maybe this should be moved
124 * into arch/i386 instead?
126 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
128 static int warncount
= 5;
129 struct __old_kernel_stat tmp
;
133 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
135 } else if (warncount
< 0) {
136 /* it's laughable, but... */
140 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
141 tmp
.st_dev
= old_encode_dev(stat
->dev
);
142 tmp
.st_ino
= stat
->ino
;
143 tmp
.st_mode
= stat
->mode
;
144 tmp
.st_nlink
= stat
->nlink
;
145 if (tmp
.st_nlink
!= stat
->nlink
)
147 SET_UID(tmp
.st_uid
, stat
->uid
);
148 SET_GID(tmp
.st_gid
, stat
->gid
);
149 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
150 #if BITS_PER_LONG == 32
151 if (stat
->size
> MAX_NON_LFS
)
154 tmp
.st_size
= stat
->size
;
155 tmp
.st_atime
= stat
->atime
.tv_sec
;
156 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
157 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
158 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
161 asmlinkage
long sys_stat(char __user
* filename
, struct __old_kernel_stat __user
* statbuf
)
164 int error
= vfs_stat_fd(AT_FDCWD
, filename
, &stat
);
167 error
= cp_old_stat(&stat
, statbuf
);
171 asmlinkage
long sys_lstat(char __user
* filename
, struct __old_kernel_stat __user
* statbuf
)
174 int error
= vfs_lstat_fd(AT_FDCWD
, filename
, &stat
);
177 error
= cp_old_stat(&stat
, statbuf
);
181 asmlinkage
long sys_fstat(unsigned int fd
, struct __old_kernel_stat __user
* statbuf
)
184 int error
= vfs_fstat(fd
, &stat
);
187 error
= cp_old_stat(&stat
, statbuf
);
192 #endif /* __ARCH_WANT_OLD_STAT */
194 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
198 #if BITS_PER_LONG == 32
199 if (!old_valid_dev(stat
->dev
) || !old_valid_dev(stat
->rdev
))
202 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
206 memset(&tmp
, 0, sizeof(tmp
));
207 #if BITS_PER_LONG == 32
208 tmp
.st_dev
= old_encode_dev(stat
->dev
);
210 tmp
.st_dev
= new_encode_dev(stat
->dev
);
212 tmp
.st_ino
= stat
->ino
;
213 tmp
.st_mode
= stat
->mode
;
214 tmp
.st_nlink
= stat
->nlink
;
215 if (tmp
.st_nlink
!= stat
->nlink
)
217 SET_UID(tmp
.st_uid
, stat
->uid
);
218 SET_GID(tmp
.st_gid
, stat
->gid
);
219 #if BITS_PER_LONG == 32
220 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
222 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
224 #if BITS_PER_LONG == 32
225 if (stat
->size
> MAX_NON_LFS
)
228 tmp
.st_size
= stat
->size
;
229 tmp
.st_atime
= stat
->atime
.tv_sec
;
230 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
231 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
232 #ifdef STAT_HAVE_NSEC
233 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
234 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
235 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
237 tmp
.st_blocks
= stat
->blocks
;
238 tmp
.st_blksize
= stat
->blksize
;
239 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
242 asmlinkage
long sys_newstat(char __user
*filename
, struct stat __user
*statbuf
)
245 int error
= vfs_stat_fd(AT_FDCWD
, filename
, &stat
);
248 error
= cp_new_stat(&stat
, statbuf
);
253 asmlinkage
long sys_newlstat(char __user
*filename
, struct stat __user
*statbuf
)
256 int error
= vfs_lstat_fd(AT_FDCWD
, filename
, &stat
);
259 error
= cp_new_stat(&stat
, statbuf
);
264 #ifndef __ARCH_WANT_STAT64
265 asmlinkage
long sys_newfstatat(int dfd
, char __user
*filename
,
266 struct stat __user
*statbuf
, int flag
)
271 if ((flag
& ~AT_SYMLINK_NOFOLLOW
) != 0)
274 if (flag
& AT_SYMLINK_NOFOLLOW
)
275 error
= vfs_lstat_fd(dfd
, filename
, &stat
);
277 error
= vfs_stat_fd(dfd
, filename
, &stat
);
280 error
= cp_new_stat(&stat
, statbuf
);
287 asmlinkage
long sys_newfstat(unsigned int fd
, struct stat __user
*statbuf
)
290 int error
= vfs_fstat(fd
, &stat
);
293 error
= cp_new_stat(&stat
, statbuf
);
298 asmlinkage
long sys_readlinkat(int dfd
, const char __user
*path
,
299 char __user
*buf
, int bufsiz
)
307 error
= __user_walk_fd(dfd
, path
, 0, &nd
);
309 struct inode
* inode
= nd
.dentry
->d_inode
;
312 if (inode
->i_op
&& inode
->i_op
->readlink
) {
313 error
= security_inode_readlink(nd
.dentry
);
315 touch_atime(nd
.mnt
, nd
.dentry
);
316 error
= inode
->i_op
->readlink(nd
.dentry
, buf
, bufsiz
);
324 asmlinkage
long sys_readlink(const char __user
*path
, char __user
*buf
,
327 return sys_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
331 /* ---------- LFS-64 ----------- */
332 #ifdef __ARCH_WANT_STAT64
334 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
338 memset(&tmp
, 0, sizeof(struct stat64
));
340 /* mips has weird padding, so we don't get 64 bits there */
341 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
343 tmp
.st_dev
= new_encode_dev(stat
->dev
);
344 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
346 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
347 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
349 tmp
.st_ino
= stat
->ino
;
350 #ifdef STAT64_HAS_BROKEN_ST_INO
351 tmp
.__st_ino
= stat
->ino
;
353 tmp
.st_mode
= stat
->mode
;
354 tmp
.st_nlink
= stat
->nlink
;
355 tmp
.st_uid
= stat
->uid
;
356 tmp
.st_gid
= stat
->gid
;
357 tmp
.st_atime
= stat
->atime
.tv_sec
;
358 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
359 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
360 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
361 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
362 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
363 tmp
.st_size
= stat
->size
;
364 tmp
.st_blocks
= stat
->blocks
;
365 tmp
.st_blksize
= stat
->blksize
;
366 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
369 asmlinkage
long sys_stat64(char __user
* filename
, struct stat64 __user
* statbuf
)
372 int error
= vfs_stat(filename
, &stat
);
375 error
= cp_new_stat64(&stat
, statbuf
);
379 asmlinkage
long sys_lstat64(char __user
* filename
, struct stat64 __user
* statbuf
)
382 int error
= vfs_lstat(filename
, &stat
);
385 error
= cp_new_stat64(&stat
, statbuf
);
389 asmlinkage
long sys_fstat64(unsigned long fd
, struct stat64 __user
* statbuf
)
392 int error
= vfs_fstat(fd
, &stat
);
395 error
= cp_new_stat64(&stat
, statbuf
);
400 asmlinkage
long sys_fstatat64(int dfd
, char __user
*filename
,
401 struct stat64 __user
*statbuf
, int flag
)
406 if ((flag
& ~AT_SYMLINK_NOFOLLOW
) != 0)
409 if (flag
& AT_SYMLINK_NOFOLLOW
)
410 error
= vfs_lstat_fd(dfd
, filename
, &stat
);
412 error
= vfs_stat_fd(dfd
, filename
, &stat
);
415 error
= cp_new_stat64(&stat
, statbuf
);
420 #endif /* __ARCH_WANT_STAT64 */
422 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
424 spin_lock(&inode
->i_lock
);
425 inode
->i_blocks
+= bytes
>> 9;
427 inode
->i_bytes
+= bytes
;
428 if (inode
->i_bytes
>= 512) {
430 inode
->i_bytes
-= 512;
432 spin_unlock(&inode
->i_lock
);
435 EXPORT_SYMBOL(inode_add_bytes
);
437 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
439 spin_lock(&inode
->i_lock
);
440 inode
->i_blocks
-= bytes
>> 9;
442 if (inode
->i_bytes
< bytes
) {
444 inode
->i_bytes
+= 512;
446 inode
->i_bytes
-= bytes
;
447 spin_unlock(&inode
->i_lock
);
450 EXPORT_SYMBOL(inode_sub_bytes
);
452 loff_t
inode_get_bytes(struct inode
*inode
)
456 spin_lock(&inode
->i_lock
);
457 ret
= (((loff_t
)inode
->i_blocks
) << 9) + inode
->i_bytes
;
458 spin_unlock(&inode
->i_lock
);
462 EXPORT_SYMBOL(inode_get_bytes
);
464 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
466 /* Caller is here responsible for sufficient locking
467 * (ie. inode->i_lock) */
468 inode
->i_blocks
= bytes
>> 9;
469 inode
->i_bytes
= bytes
& 511;
472 EXPORT_SYMBOL(inode_set_bytes
);