4 * Copyright (C) 1995 Linus Torvalds
7 #include <linux/module.h>
8 #include <linux/time.h>
10 #include <linux/errno.h>
11 #include <linux/stat.h>
12 #include <linux/file.h>
13 #include <linux/smp_lock.h>
15 #include <linux/dirent.h>
16 #include <linux/security.h>
17 #include <linux/syscalls.h>
18 #include <linux/unistd.h>
20 #include <asm/uaccess.h>
22 int vfs_readdir(struct file
*file
, filldir_t filler
, void *buf
)
24 struct inode
*inode
= file
->f_dentry
->d_inode
;
26 if (!file
->f_op
|| !file
->f_op
->readdir
)
29 res
= security_file_permission(file
, MAY_READ
);
35 if (!IS_DEADDIR(inode
)) {
36 res
= file
->f_op
->readdir(file
, buf
, filler
);
44 EXPORT_SYMBOL(vfs_readdir
);
47 * Traditional linux readdir() handling..
49 * "count=1" is a special case, meaning that the buffer is one
50 * dirent-structure in size and that the code can't handle more
51 * anyway. Thus the special "fillonedir()" function for that
52 * case (the low-level handlers don't need to care about this).
54 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
55 #define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))
57 #ifdef __ARCH_WANT_OLD_READDIR
59 struct old_linux_dirent
{
61 unsigned long d_offset
;
62 unsigned short d_namlen
;
66 struct readdir_callback
{
67 struct old_linux_dirent __user
* dirent
;
71 static int fillonedir(void * __buf
, const char * name
, int namlen
, loff_t offset
,
72 ino_t ino
, unsigned int d_type
)
74 struct readdir_callback
* buf
= (struct readdir_callback
*) __buf
;
75 struct old_linux_dirent __user
* dirent
;
81 if (!access_ok(VERIFY_WRITE
, dirent
,
82 (unsigned long)(dirent
->d_name
+ namlen
+ 1) -
83 (unsigned long)dirent
))
85 if ( __put_user(ino
, &dirent
->d_ino
) ||
86 __put_user(offset
, &dirent
->d_offset
) ||
87 __put_user(namlen
, &dirent
->d_namlen
) ||
88 __copy_to_user(dirent
->d_name
, name
, namlen
) ||
89 __put_user(0, dirent
->d_name
+ namlen
))
93 buf
->result
= -EFAULT
;
97 asmlinkage
long old_readdir(unsigned int fd
, struct old_linux_dirent __user
* dirent
, unsigned int count
)
101 struct readdir_callback buf
;
111 error
= vfs_readdir(file
, fillonedir
, &buf
);
120 #endif /* __ARCH_WANT_OLD_READDIR */
123 * New, all-improved, singing, dancing, iBCS2-compliant getdents()
126 struct linux_dirent
{
129 unsigned short d_reclen
;
133 struct getdents_callback
{
134 struct linux_dirent __user
* current_dir
;
135 struct linux_dirent __user
* previous
;
140 static int filldir(void * __buf
, const char * name
, int namlen
, loff_t offset
,
141 ino_t ino
, unsigned int d_type
)
143 struct linux_dirent __user
* dirent
;
144 struct getdents_callback
* buf
= (struct getdents_callback
*) __buf
;
145 int reclen
= ROUND_UP(NAME_OFFSET(dirent
) + namlen
+ 2);
147 buf
->error
= -EINVAL
; /* only used if we fail.. */
148 if (reclen
> buf
->count
)
150 dirent
= buf
->previous
;
152 if (__put_user(offset
, &dirent
->d_off
))
155 dirent
= buf
->current_dir
;
156 if (__put_user(ino
, &dirent
->d_ino
))
158 if (__put_user(reclen
, &dirent
->d_reclen
))
160 if (copy_to_user(dirent
->d_name
, name
, namlen
))
162 if (__put_user(0, dirent
->d_name
+ namlen
))
164 if (__put_user(d_type
, (char __user
*) dirent
+ reclen
- 1))
166 buf
->previous
= dirent
;
167 dirent
= (void __user
*)dirent
+ reclen
;
168 buf
->current_dir
= dirent
;
169 buf
->count
-= reclen
;
172 buf
->error
= -EFAULT
;
176 asmlinkage
long sys_getdents(unsigned int fd
, struct linux_dirent __user
* dirent
, unsigned int count
)
179 struct linux_dirent __user
* lastdirent
;
180 struct getdents_callback buf
;
184 if (!access_ok(VERIFY_WRITE
, dirent
, count
))
192 buf
.current_dir
= dirent
;
197 error
= vfs_readdir(file
, filldir
, &buf
);
201 lastdirent
= buf
.previous
;
203 if (put_user(file
->f_pos
, &lastdirent
->d_off
))
206 error
= count
- buf
.count
;
215 #define ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
217 struct getdents_callback64
{
218 struct linux_dirent64 __user
* current_dir
;
219 struct linux_dirent64 __user
* previous
;
224 static int filldir64(void * __buf
, const char * name
, int namlen
, loff_t offset
,
225 ino_t ino
, unsigned int d_type
)
227 struct linux_dirent64 __user
*dirent
;
228 struct getdents_callback64
* buf
= (struct getdents_callback64
*) __buf
;
229 int reclen
= ROUND_UP64(NAME_OFFSET(dirent
) + namlen
+ 1);
231 buf
->error
= -EINVAL
; /* only used if we fail.. */
232 if (reclen
> buf
->count
)
234 dirent
= buf
->previous
;
236 if (__put_user(offset
, &dirent
->d_off
))
239 dirent
= buf
->current_dir
;
240 if (__put_user(ino
, &dirent
->d_ino
))
242 if (__put_user(0, &dirent
->d_off
))
244 if (__put_user(reclen
, &dirent
->d_reclen
))
246 if (__put_user(d_type
, &dirent
->d_type
))
248 if (copy_to_user(dirent
->d_name
, name
, namlen
))
250 if (__put_user(0, dirent
->d_name
+ namlen
))
252 buf
->previous
= dirent
;
253 dirent
= (void __user
*)dirent
+ reclen
;
254 buf
->current_dir
= dirent
;
255 buf
->count
-= reclen
;
258 buf
->error
= -EFAULT
;
262 asmlinkage
long sys_getdents64(unsigned int fd
, struct linux_dirent64 __user
* dirent
, unsigned int count
)
265 struct linux_dirent64 __user
* lastdirent
;
266 struct getdents_callback64 buf
;
270 if (!access_ok(VERIFY_WRITE
, dirent
, count
))
278 buf
.current_dir
= dirent
;
283 error
= vfs_readdir(file
, filldir64
, &buf
);
287 lastdirent
= buf
.previous
;
289 typeof(lastdirent
->d_off
) d_off
= file
->f_pos
;
291 if (__put_user(d_off
, &lastdirent
->d_off
))
293 error
= count
- buf
.count
;
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