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
->atime
= inode
->i_atime
;
31 stat
->mtime
= inode
->i_mtime
;
32 stat
->ctime
= inode
->i_ctime
;
33 stat
->size
= i_size_read(inode
);
34 stat
->blocks
= inode
->i_blocks
;
35 stat
->blksize
= (1 << inode
->i_blkbits
);
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_stat_fd(int dfd
, char __user
*name
, struct kstat
*stat
)
63 error
= __user_walk_fd(dfd
, name
, LOOKUP_FOLLOW
, &nd
);
65 error
= vfs_getattr(nd
.path
.mnt
, nd
.path
.dentry
, stat
);
71 int vfs_stat(char __user
*name
, struct kstat
*stat
)
73 return vfs_stat_fd(AT_FDCWD
, name
, stat
);
76 EXPORT_SYMBOL(vfs_stat
);
78 int vfs_lstat_fd(int dfd
, char __user
*name
, struct kstat
*stat
)
83 error
= __user_walk_fd(dfd
, name
, 0, &nd
);
85 error
= vfs_getattr(nd
.path
.mnt
, nd
.path
.dentry
, stat
);
91 int vfs_lstat(char __user
*name
, struct kstat
*stat
)
93 return vfs_lstat_fd(AT_FDCWD
, name
, stat
);
96 EXPORT_SYMBOL(vfs_lstat
);
98 int vfs_fstat(unsigned int fd
, struct kstat
*stat
)
100 struct file
*f
= fget(fd
);
104 error
= vfs_getattr(f
->f_path
.mnt
, f
->f_path
.dentry
, stat
);
110 EXPORT_SYMBOL(vfs_fstat
);
112 #ifdef __ARCH_WANT_OLD_STAT
115 * For backward compatibility? Maybe this should be moved
116 * into arch/i386 instead?
118 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
120 static int warncount
= 5;
121 struct __old_kernel_stat tmp
;
125 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
127 } else if (warncount
< 0) {
128 /* it's laughable, but... */
132 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
133 tmp
.st_dev
= old_encode_dev(stat
->dev
);
134 tmp
.st_ino
= stat
->ino
;
135 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
137 tmp
.st_mode
= stat
->mode
;
138 tmp
.st_nlink
= stat
->nlink
;
139 if (tmp
.st_nlink
!= stat
->nlink
)
141 SET_UID(tmp
.st_uid
, stat
->uid
);
142 SET_GID(tmp
.st_gid
, stat
->gid
);
143 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
144 #if BITS_PER_LONG == 32
145 if (stat
->size
> MAX_NON_LFS
)
148 tmp
.st_size
= stat
->size
;
149 tmp
.st_atime
= stat
->atime
.tv_sec
;
150 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
151 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
152 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
155 asmlinkage
long sys_stat(char __user
* filename
, struct __old_kernel_stat __user
* statbuf
)
158 int error
= vfs_stat_fd(AT_FDCWD
, filename
, &stat
);
161 error
= cp_old_stat(&stat
, statbuf
);
165 asmlinkage
long sys_lstat(char __user
* filename
, struct __old_kernel_stat __user
* statbuf
)
168 int error
= vfs_lstat_fd(AT_FDCWD
, filename
, &stat
);
171 error
= cp_old_stat(&stat
, statbuf
);
175 asmlinkage
long sys_fstat(unsigned int fd
, struct __old_kernel_stat __user
* statbuf
)
178 int error
= vfs_fstat(fd
, &stat
);
181 error
= cp_old_stat(&stat
, statbuf
);
186 #endif /* __ARCH_WANT_OLD_STAT */
188 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
192 #if BITS_PER_LONG == 32
193 if (!old_valid_dev(stat
->dev
) || !old_valid_dev(stat
->rdev
))
196 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
200 memset(&tmp
, 0, sizeof(tmp
));
201 #if BITS_PER_LONG == 32
202 tmp
.st_dev
= old_encode_dev(stat
->dev
);
204 tmp
.st_dev
= new_encode_dev(stat
->dev
);
206 tmp
.st_ino
= stat
->ino
;
207 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
209 tmp
.st_mode
= stat
->mode
;
210 tmp
.st_nlink
= stat
->nlink
;
211 if (tmp
.st_nlink
!= stat
->nlink
)
213 SET_UID(tmp
.st_uid
, stat
->uid
);
214 SET_GID(tmp
.st_gid
, stat
->gid
);
215 #if BITS_PER_LONG == 32
216 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
218 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
220 #if BITS_PER_LONG == 32
221 if (stat
->size
> MAX_NON_LFS
)
224 tmp
.st_size
= stat
->size
;
225 tmp
.st_atime
= stat
->atime
.tv_sec
;
226 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
227 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
228 #ifdef STAT_HAVE_NSEC
229 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
230 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
231 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
233 tmp
.st_blocks
= stat
->blocks
;
234 tmp
.st_blksize
= stat
->blksize
;
235 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
238 asmlinkage
long sys_newstat(char __user
*filename
, struct stat __user
*statbuf
)
241 int error
= vfs_stat_fd(AT_FDCWD
, filename
, &stat
);
244 error
= cp_new_stat(&stat
, statbuf
);
249 asmlinkage
long sys_newlstat(char __user
*filename
, struct stat __user
*statbuf
)
252 int error
= vfs_lstat_fd(AT_FDCWD
, filename
, &stat
);
255 error
= cp_new_stat(&stat
, statbuf
);
260 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
261 asmlinkage
long sys_newfstatat(int dfd
, char __user
*filename
,
262 struct stat __user
*statbuf
, int flag
)
267 if ((flag
& ~AT_SYMLINK_NOFOLLOW
) != 0)
270 if (flag
& AT_SYMLINK_NOFOLLOW
)
271 error
= vfs_lstat_fd(dfd
, filename
, &stat
);
273 error
= vfs_stat_fd(dfd
, filename
, &stat
);
276 error
= cp_new_stat(&stat
, statbuf
);
283 asmlinkage
long sys_newfstat(unsigned int fd
, struct stat __user
*statbuf
)
286 int error
= vfs_fstat(fd
, &stat
);
289 error
= cp_new_stat(&stat
, statbuf
);
294 asmlinkage
long sys_readlinkat(int dfd
, const char __user
*path
,
295 char __user
*buf
, int bufsiz
)
303 error
= __user_walk_fd(dfd
, path
, 0, &nd
);
305 struct inode
*inode
= nd
.path
.dentry
->d_inode
;
308 if (inode
->i_op
&& inode
->i_op
->readlink
) {
309 error
= security_inode_readlink(nd
.path
.dentry
);
311 touch_atime(nd
.path
.mnt
, nd
.path
.dentry
);
312 error
= inode
->i_op
->readlink(nd
.path
.dentry
,
321 asmlinkage
long sys_readlink(const char __user
*path
, char __user
*buf
,
324 return sys_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
328 /* ---------- LFS-64 ----------- */
329 #ifdef __ARCH_WANT_STAT64
331 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
335 memset(&tmp
, 0, sizeof(struct stat64
));
337 /* mips has weird padding, so we don't get 64 bits there */
338 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
340 tmp
.st_dev
= new_encode_dev(stat
->dev
);
341 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
343 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
344 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
346 tmp
.st_ino
= stat
->ino
;
347 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
349 #ifdef STAT64_HAS_BROKEN_ST_INO
350 tmp
.__st_ino
= stat
->ino
;
352 tmp
.st_mode
= stat
->mode
;
353 tmp
.st_nlink
= stat
->nlink
;
354 tmp
.st_uid
= stat
->uid
;
355 tmp
.st_gid
= stat
->gid
;
356 tmp
.st_atime
= stat
->atime
.tv_sec
;
357 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
358 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
359 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
360 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
361 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
362 tmp
.st_size
= stat
->size
;
363 tmp
.st_blocks
= stat
->blocks
;
364 tmp
.st_blksize
= stat
->blksize
;
365 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
368 asmlinkage
long sys_stat64(char __user
* filename
, struct stat64 __user
* statbuf
)
371 int error
= vfs_stat(filename
, &stat
);
374 error
= cp_new_stat64(&stat
, statbuf
);
378 asmlinkage
long sys_lstat64(char __user
* filename
, struct stat64 __user
* statbuf
)
381 int error
= vfs_lstat(filename
, &stat
);
384 error
= cp_new_stat64(&stat
, statbuf
);
388 asmlinkage
long sys_fstat64(unsigned long fd
, struct stat64 __user
* statbuf
)
391 int error
= vfs_fstat(fd
, &stat
);
394 error
= cp_new_stat64(&stat
, statbuf
);
399 asmlinkage
long sys_fstatat64(int dfd
, char __user
*filename
,
400 struct stat64 __user
*statbuf
, int flag
)
405 if ((flag
& ~AT_SYMLINK_NOFOLLOW
) != 0)
408 if (flag
& AT_SYMLINK_NOFOLLOW
)
409 error
= vfs_lstat_fd(dfd
, filename
, &stat
);
411 error
= vfs_stat_fd(dfd
, filename
, &stat
);
414 error
= cp_new_stat64(&stat
, statbuf
);
419 #endif /* __ARCH_WANT_STAT64 */
421 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
423 spin_lock(&inode
->i_lock
);
424 inode
->i_blocks
+= bytes
>> 9;
426 inode
->i_bytes
+= bytes
;
427 if (inode
->i_bytes
>= 512) {
429 inode
->i_bytes
-= 512;
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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