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(char __user
*name
, struct kstat
*stat
)
71 error
= user_path_walk(name
, &nd
);
73 error
= vfs_getattr(nd
.mnt
, nd
.dentry
, stat
);
79 EXPORT_SYMBOL(vfs_stat
);
81 int vfs_lstat(char __user
*name
, struct kstat
*stat
)
86 error
= user_path_walk_link(name
, &nd
);
88 error
= vfs_getattr(nd
.mnt
, nd
.dentry
, stat
);
94 EXPORT_SYMBOL(vfs_lstat
);
96 int vfs_fstat(unsigned int fd
, struct kstat
*stat
)
98 struct file
*f
= fget(fd
);
102 error
= vfs_getattr(f
->f_vfsmnt
, f
->f_dentry
, stat
);
108 EXPORT_SYMBOL(vfs_fstat
);
110 #ifdef __ARCH_WANT_OLD_STAT
113 * For backward compatibility? Maybe this should be moved
114 * into arch/i386 instead?
116 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
118 static int warncount
= 5;
119 struct __old_kernel_stat tmp
;
123 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
125 } else if (warncount
< 0) {
126 /* it's laughable, but... */
130 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
131 tmp
.st_dev
= old_encode_dev(stat
->dev
);
132 tmp
.st_ino
= stat
->ino
;
133 tmp
.st_mode
= stat
->mode
;
134 tmp
.st_nlink
= stat
->nlink
;
135 if (tmp
.st_nlink
!= stat
->nlink
)
137 SET_UID(tmp
.st_uid
, stat
->uid
);
138 SET_GID(tmp
.st_gid
, stat
->gid
);
139 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
140 #if BITS_PER_LONG == 32
141 if (stat
->size
> MAX_NON_LFS
)
144 tmp
.st_size
= stat
->size
;
145 tmp
.st_atime
= stat
->atime
.tv_sec
;
146 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
147 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
148 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
151 asmlinkage
long sys_stat(char __user
* filename
, struct __old_kernel_stat __user
* statbuf
)
154 int error
= vfs_stat(filename
, &stat
);
157 error
= cp_old_stat(&stat
, statbuf
);
161 asmlinkage
long sys_lstat(char __user
* filename
, struct __old_kernel_stat __user
* statbuf
)
164 int error
= vfs_lstat(filename
, &stat
);
167 error
= cp_old_stat(&stat
, statbuf
);
171 asmlinkage
long sys_fstat(unsigned int fd
, struct __old_kernel_stat __user
* statbuf
)
174 int error
= vfs_fstat(fd
, &stat
);
177 error
= cp_old_stat(&stat
, statbuf
);
182 #endif /* __ARCH_WANT_OLD_STAT */
184 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
188 #if BITS_PER_LONG == 32
189 if (!old_valid_dev(stat
->dev
) || !old_valid_dev(stat
->rdev
))
192 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
196 memset(&tmp
, 0, sizeof(tmp
));
197 #if BITS_PER_LONG == 32
198 tmp
.st_dev
= old_encode_dev(stat
->dev
);
200 tmp
.st_dev
= new_encode_dev(stat
->dev
);
202 tmp
.st_ino
= stat
->ino
;
203 tmp
.st_mode
= stat
->mode
;
204 tmp
.st_nlink
= stat
->nlink
;
205 if (tmp
.st_nlink
!= stat
->nlink
)
207 SET_UID(tmp
.st_uid
, stat
->uid
);
208 SET_GID(tmp
.st_gid
, stat
->gid
);
209 #if BITS_PER_LONG == 32
210 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
212 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
214 #if BITS_PER_LONG == 32
215 if (stat
->size
> MAX_NON_LFS
)
218 tmp
.st_size
= stat
->size
;
219 tmp
.st_atime
= stat
->atime
.tv_sec
;
220 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
221 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
222 #ifdef STAT_HAVE_NSEC
223 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
224 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
225 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
227 tmp
.st_blocks
= stat
->blocks
;
228 tmp
.st_blksize
= stat
->blksize
;
229 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
232 asmlinkage
long sys_newstat(char __user
* filename
, struct stat __user
* statbuf
)
235 int error
= vfs_stat(filename
, &stat
);
238 error
= cp_new_stat(&stat
, statbuf
);
242 asmlinkage
long sys_newlstat(char __user
* filename
, struct stat __user
* statbuf
)
245 int error
= vfs_lstat(filename
, &stat
);
248 error
= cp_new_stat(&stat
, statbuf
);
252 asmlinkage
long sys_newfstat(unsigned int fd
, struct stat __user
* statbuf
)
255 int error
= vfs_fstat(fd
, &stat
);
258 error
= cp_new_stat(&stat
, statbuf
);
263 asmlinkage
long sys_readlink(const char __user
* path
, char __user
* buf
, int bufsiz
)
271 error
= user_path_walk_link(path
, &nd
);
273 struct inode
* inode
= nd
.dentry
->d_inode
;
276 if (inode
->i_op
&& inode
->i_op
->readlink
) {
277 error
= security_inode_readlink(nd
.dentry
);
279 touch_atime(nd
.mnt
, nd
.dentry
);
280 error
= inode
->i_op
->readlink(nd
.dentry
, buf
, bufsiz
);
289 /* ---------- LFS-64 ----------- */
290 #ifdef __ARCH_WANT_STAT64
292 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
296 memset(&tmp
, 0, sizeof(struct stat64
));
298 /* mips has weird padding, so we don't get 64 bits there */
299 if (!new_valid_dev(stat
->dev
) || !new_valid_dev(stat
->rdev
))
301 tmp
.st_dev
= new_encode_dev(stat
->dev
);
302 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
304 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
305 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
307 tmp
.st_ino
= stat
->ino
;
308 #ifdef STAT64_HAS_BROKEN_ST_INO
309 tmp
.__st_ino
= stat
->ino
;
311 tmp
.st_mode
= stat
->mode
;
312 tmp
.st_nlink
= stat
->nlink
;
313 tmp
.st_uid
= stat
->uid
;
314 tmp
.st_gid
= stat
->gid
;
315 tmp
.st_atime
= stat
->atime
.tv_sec
;
316 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
317 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
318 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
319 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
320 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
321 tmp
.st_size
= stat
->size
;
322 tmp
.st_blocks
= stat
->blocks
;
323 tmp
.st_blksize
= stat
->blksize
;
324 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
327 asmlinkage
long sys_stat64(char __user
* filename
, struct stat64 __user
* statbuf
)
330 int error
= vfs_stat(filename
, &stat
);
333 error
= cp_new_stat64(&stat
, statbuf
);
337 asmlinkage
long sys_lstat64(char __user
* filename
, struct stat64 __user
* statbuf
)
340 int error
= vfs_lstat(filename
, &stat
);
343 error
= cp_new_stat64(&stat
, statbuf
);
347 asmlinkage
long sys_fstat64(unsigned long fd
, struct stat64 __user
* statbuf
)
350 int error
= vfs_fstat(fd
, &stat
);
353 error
= cp_new_stat64(&stat
, statbuf
);
358 #endif /* __ARCH_WANT_STAT64 */
360 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
362 spin_lock(&inode
->i_lock
);
363 inode
->i_blocks
+= bytes
>> 9;
365 inode
->i_bytes
+= bytes
;
366 if (inode
->i_bytes
>= 512) {
368 inode
->i_bytes
-= 512;
370 spin_unlock(&inode
->i_lock
);
373 EXPORT_SYMBOL(inode_add_bytes
);
375 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
377 spin_lock(&inode
->i_lock
);
378 inode
->i_blocks
-= bytes
>> 9;
380 if (inode
->i_bytes
< bytes
) {
382 inode
->i_bytes
+= 512;
384 inode
->i_bytes
-= bytes
;
385 spin_unlock(&inode
->i_lock
);
388 EXPORT_SYMBOL(inode_sub_bytes
);
390 loff_t
inode_get_bytes(struct inode
*inode
)
394 spin_lock(&inode
->i_lock
);
395 ret
= (((loff_t
)inode
->i_blocks
) << 9) + inode
->i_bytes
;
396 spin_unlock(&inode
->i_lock
);
400 EXPORT_SYMBOL(inode_get_bytes
);
402 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
404 /* Caller is here responsible for sufficient locking
405 * (ie. inode->i_lock) */
406 inode
->i_blocks
= bytes
>> 9;
407 inode
->i_bytes
= bytes
& 511;
410 EXPORT_SYMBOL(inode_set_bytes
);