4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/module.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 file
*f
= fget(fd
);
64 error
= vfs_getattr(f
->f_path
.mnt
, f
->f_path
.dentry
, stat
);
69 EXPORT_SYMBOL(vfs_fstat
);
71 int vfs_fstatat(int dfd
, const char __user
*filename
, struct kstat
*stat
,
78 if ((flag
& ~(AT_SYMLINK_NOFOLLOW
| AT_NO_AUTOMOUNT
|
82 if (!(flag
& AT_SYMLINK_NOFOLLOW
))
83 lookup_flags
|= LOOKUP_FOLLOW
;
84 if (flag
& AT_EMPTY_PATH
)
85 lookup_flags
|= LOOKUP_EMPTY
;
87 error
= user_path_at(dfd
, filename
, lookup_flags
, &path
);
91 error
= vfs_getattr(path
.mnt
, path
.dentry
, stat
);
96 EXPORT_SYMBOL(vfs_fstatat
);
98 int vfs_stat(const char __user
*name
, struct kstat
*stat
)
100 return vfs_fstatat(AT_FDCWD
, name
, stat
, 0);
102 EXPORT_SYMBOL(vfs_stat
);
104 int vfs_lstat(const char __user
*name
, struct kstat
*stat
)
106 return vfs_fstatat(AT_FDCWD
, name
, stat
, AT_SYMLINK_NOFOLLOW
);
108 EXPORT_SYMBOL(vfs_lstat
);
111 #ifdef __ARCH_WANT_OLD_STAT
114 * For backward compatibility? Maybe this should be moved
115 * into arch/i386 instead?
117 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
119 static int warncount
= 5;
120 struct __old_kernel_stat tmp
;
124 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
126 } else if (warncount
< 0) {
127 /* it's laughable, but... */
131 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
132 tmp
.st_dev
= old_encode_dev(stat
->dev
);
133 tmp
.st_ino
= stat
->ino
;
134 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
136 tmp
.st_mode
= stat
->mode
;
137 tmp
.st_nlink
= stat
->nlink
;
138 if (tmp
.st_nlink
!= stat
->nlink
)
140 SET_UID(tmp
.st_uid
, stat
->uid
);
141 SET_GID(tmp
.st_gid
, stat
->gid
);
142 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
143 #if BITS_PER_LONG == 32
144 if (stat
->size
> MAX_NON_LFS
)
147 tmp
.st_size
= stat
->size
;
148 tmp
.st_atime
= stat
->atime
.tv_sec
;
149 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
150 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
151 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
154 SYSCALL_DEFINE2(stat
, const char __user
*, filename
,
155 struct __old_kernel_stat __user
*, statbuf
)
160 error
= vfs_stat(filename
, &stat
);
164 return cp_old_stat(&stat
, statbuf
);
167 SYSCALL_DEFINE2(lstat
, const char __user
*, filename
,
168 struct __old_kernel_stat __user
*, statbuf
)
173 error
= vfs_lstat(filename
, &stat
);
177 return cp_old_stat(&stat
, statbuf
);
180 SYSCALL_DEFINE2(fstat
, unsigned int, fd
, struct __old_kernel_stat __user
*, statbuf
)
183 int error
= vfs_fstat(fd
, &stat
);
186 error
= cp_old_stat(&stat
, statbuf
);
191 #endif /* __ARCH_WANT_OLD_STAT */
193 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
197 #if BITS_PER_LONG == 32
198 if (!old_valid_dev(stat
->dev
) || !old_valid_dev(stat
->rdev
))
201 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
205 memset(&tmp
, 0, sizeof(tmp
));
206 #if BITS_PER_LONG == 32
207 tmp
.st_dev
= old_encode_dev(stat
->dev
);
209 tmp
.st_dev
= new_encode_dev(stat
->dev
);
211 tmp
.st_ino
= stat
->ino
;
212 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
214 tmp
.st_mode
= stat
->mode
;
215 tmp
.st_nlink
= stat
->nlink
;
216 if (tmp
.st_nlink
!= stat
->nlink
)
218 SET_UID(tmp
.st_uid
, stat
->uid
);
219 SET_GID(tmp
.st_gid
, stat
->gid
);
220 #if BITS_PER_LONG == 32
221 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
223 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
225 #if BITS_PER_LONG == 32
226 if (stat
->size
> MAX_NON_LFS
)
229 tmp
.st_size
= stat
->size
;
230 tmp
.st_atime
= stat
->atime
.tv_sec
;
231 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
232 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
233 #ifdef STAT_HAVE_NSEC
234 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
235 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
236 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
238 tmp
.st_blocks
= stat
->blocks
;
239 tmp
.st_blksize
= stat
->blksize
;
240 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
243 SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
244 struct stat __user
*, statbuf
)
247 int error
= vfs_stat(filename
, &stat
);
251 return cp_new_stat(&stat
, statbuf
);
254 SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
255 struct stat __user
*, statbuf
)
260 error
= vfs_lstat(filename
, &stat
);
264 return cp_new_stat(&stat
, statbuf
);
267 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
268 SYSCALL_DEFINE4(newfstatat
, int, dfd
, const char __user
*, filename
,
269 struct stat __user
*, statbuf
, int, flag
)
274 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
277 return cp_new_stat(&stat
, statbuf
);
281 SYSCALL_DEFINE2(newfstat
, unsigned int, fd
, struct stat __user
*, statbuf
)
284 int error
= vfs_fstat(fd
, &stat
);
287 error
= cp_new_stat(&stat
, statbuf
);
292 SYSCALL_DEFINE4(readlinkat
, int, dfd
, const char __user
*, pathname
,
293 char __user
*, buf
, int, bufsiz
)
302 error
= user_path_at_empty(dfd
, pathname
, LOOKUP_EMPTY
, &path
, &empty
);
304 struct inode
*inode
= path
.dentry
->d_inode
;
306 error
= empty
? -ENOENT
: -EINVAL
;
307 if (inode
->i_op
->readlink
) {
308 error
= security_inode_readlink(path
.dentry
);
310 touch_atime(path
.mnt
, path
.dentry
);
311 error
= inode
->i_op
->readlink(path
.dentry
,
320 SYSCALL_DEFINE3(readlink
, const char __user
*, path
, char __user
*, buf
,
323 return sys_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
327 /* ---------- LFS-64 ----------- */
328 #ifdef __ARCH_WANT_STAT64
330 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
334 memset(&tmp
, 0, sizeof(struct stat64
));
336 /* mips has weird padding, so we don't get 64 bits there */
337 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
339 tmp
.st_dev
= new_encode_dev(stat
->dev
);
340 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
342 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
343 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
345 tmp
.st_ino
= stat
->ino
;
346 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
348 #ifdef STAT64_HAS_BROKEN_ST_INO
349 tmp
.__st_ino
= stat
->ino
;
351 tmp
.st_mode
= stat
->mode
;
352 tmp
.st_nlink
= stat
->nlink
;
353 tmp
.st_uid
= stat
->uid
;
354 tmp
.st_gid
= stat
->gid
;
355 tmp
.st_atime
= stat
->atime
.tv_sec
;
356 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
357 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
358 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
359 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
360 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
361 tmp
.st_size
= stat
->size
;
362 tmp
.st_blocks
= stat
->blocks
;
363 tmp
.st_blksize
= stat
->blksize
;
364 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
367 SYSCALL_DEFINE2(stat64
, const char __user
*, filename
,
368 struct stat64 __user
*, statbuf
)
371 int error
= vfs_stat(filename
, &stat
);
374 error
= cp_new_stat64(&stat
, statbuf
);
379 SYSCALL_DEFINE2(lstat64
, const char __user
*, filename
,
380 struct stat64 __user
*, statbuf
)
383 int error
= vfs_lstat(filename
, &stat
);
386 error
= cp_new_stat64(&stat
, statbuf
);
391 SYSCALL_DEFINE2(fstat64
, unsigned long, fd
, struct stat64 __user
*, statbuf
)
394 int error
= vfs_fstat(fd
, &stat
);
397 error
= cp_new_stat64(&stat
, statbuf
);
402 SYSCALL_DEFINE4(fstatat64
, int, dfd
, const char __user
*, filename
,
403 struct stat64 __user
*, statbuf
, int, flag
)
408 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
411 return cp_new_stat64(&stat
, statbuf
);
413 #endif /* __ARCH_WANT_STAT64 */
415 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
416 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
)
418 inode
->i_blocks
+= bytes
>> 9;
420 inode
->i_bytes
+= bytes
;
421 if (inode
->i_bytes
>= 512) {
423 inode
->i_bytes
-= 512;
427 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
429 spin_lock(&inode
->i_lock
);
430 __inode_add_bytes(inode
, bytes
);
431 spin_unlock(&inode
->i_lock
);
434 EXPORT_SYMBOL(inode_add_bytes
);
436 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
438 spin_lock(&inode
->i_lock
);
439 inode
->i_blocks
-= bytes
>> 9;
441 if (inode
->i_bytes
< bytes
) {
443 inode
->i_bytes
+= 512;
445 inode
->i_bytes
-= bytes
;
446 spin_unlock(&inode
->i_lock
);
449 EXPORT_SYMBOL(inode_sub_bytes
);
451 loff_t
inode_get_bytes(struct inode
*inode
)
455 spin_lock(&inode
->i_lock
);
456 ret
= (((loff_t
)inode
->i_blocks
) << 9) + inode
->i_bytes
;
457 spin_unlock(&inode
->i_lock
);
461 EXPORT_SYMBOL(inode_get_bytes
);
463 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
465 /* Caller is here responsible for sufficient locking
466 * (ie. inode->i_lock) */
467 inode
->i_blocks
= bytes
>> 9;
468 inode
->i_bytes
= bytes
& 511;
471 EXPORT_SYMBOL(inode_set_bytes
);
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