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>
18 #include <asm/uaccess.h>
20 int vfs_readdir(struct file *file, filldir_t filler, void *buf)
22 struct inode *inode = file->f_dentry->d_inode;
24 if (!file->f_op || !file->f_op->readdir)
27 res = security_file_permission(file, MAY_READ);
33 if (!IS_DEADDIR(inode)) {
34 res = file->f_op->readdir(file, buf, filler);
42 EXPORT_SYMBOL(vfs_readdir);
45 * Traditional linux readdir() handling..
47 * "count=1" is a special case, meaning that the buffer is one
48 * dirent-structure in size and that the code can't handle more
49 * anyway. Thus the special "fillonedir()" function for that
50 * case (the low-level handlers don't need to care about this).
52 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
53 #define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))
57 struct old_linux_dirent {
59 unsigned long d_offset;
60 unsigned short d_namlen;
64 struct readdir_callback {
65 struct old_linux_dirent __user * dirent;
69 static int fillonedir(void * __buf, const char * name, int namlen, loff_t offset,
70 ino_t ino, unsigned int d_type)
72 struct readdir_callback * buf = (struct readdir_callback *) __buf;
73 struct old_linux_dirent __user * dirent;
79 if (!access_ok(VERIFY_WRITE, (unsigned long)dirent,
80 (unsigned long)(dirent->d_name + namlen + 1) -
81 (unsigned long)dirent))
83 if ( __put_user(ino, &dirent->d_ino) ||
84 __put_user(offset, &dirent->d_offset) ||
85 __put_user(namlen, &dirent->d_namlen) ||
86 __copy_to_user(dirent->d_name, name, namlen) ||
87 __put_user(0, dirent->d_name + namlen))
91 buf->result = -EFAULT;
95 asmlinkage long old_readdir(unsigned int fd, struct old_linux_dirent __user * dirent, unsigned int count)
99 struct readdir_callback buf;
109 error = vfs_readdir(file, fillonedir, &buf);
118 #endif /* !__ia64__ */
121 * New, all-improved, singing, dancing, iBCS2-compliant getdents()
124 struct linux_dirent {
127 unsigned short d_reclen;
131 struct getdents_callback {
132 struct linux_dirent __user * current_dir;
133 struct linux_dirent __user * previous;
138 static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
139 ino_t ino, unsigned int d_type)
141 struct linux_dirent __user * dirent;
142 struct getdents_callback * buf = (struct getdents_callback *) __buf;
143 int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
145 buf->error = -EINVAL; /* only used if we fail.. */
146 if (reclen > buf->count)
148 dirent = buf->previous;
150 if (__put_user(offset, &dirent->d_off))
153 dirent = buf->current_dir;
154 if (__put_user(ino, &dirent->d_ino))
156 if (__put_user(reclen, &dirent->d_reclen))
158 if (copy_to_user(dirent->d_name, name, namlen))
160 if (__put_user(0, dirent->d_name + namlen))
162 if (__put_user(d_type, (char *) dirent + reclen - 1))
164 buf->previous = dirent;
165 dirent = (void __user *)dirent + reclen;
166 buf->current_dir = dirent;
167 buf->count -= reclen;
170 buf->error = -EFAULT;
174 asmlinkage long sys_getdents(unsigned int fd, struct linux_dirent __user * dirent, unsigned int count)
177 struct linux_dirent __user * lastdirent;
178 struct getdents_callback buf;
182 if (!access_ok(VERIFY_WRITE, dirent, count))
190 buf.current_dir = dirent;
195 error = vfs_readdir(file, filldir, &buf);
199 lastdirent = buf.previous;
201 if (put_user(file->f_pos, &lastdirent->d_off))
204 error = count - buf.count;
213 #define ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
215 struct getdents_callback64 {
216 struct linux_dirent64 __user * current_dir;
217 struct linux_dirent64 __user * previous;
222 static int filldir64(void * __buf, const char * name, int namlen, loff_t offset,
223 ino_t ino, unsigned int d_type)
225 struct linux_dirent64 __user *dirent;
226 struct getdents_callback64 * buf = (struct getdents_callback64 *) __buf;
227 int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namlen + 1);
229 buf->error = -EINVAL; /* only used if we fail.. */
230 if (reclen > buf->count)
232 dirent = buf->previous;
234 if (__put_user(offset, &dirent->d_off))
237 dirent = buf->current_dir;
238 if (__put_user(ino, &dirent->d_ino))
240 if (__put_user(0, &dirent->d_off))
242 if (__put_user(reclen, &dirent->d_reclen))
244 if (__put_user(d_type, &dirent->d_type))
246 if (copy_to_user(dirent->d_name, name, namlen))
248 if (__put_user(0, dirent->d_name + namlen))
250 buf->previous = dirent;
251 dirent = (void __user *)dirent + reclen;
252 buf->current_dir = dirent;
253 buf->count -= reclen;
256 buf->error = -EFAULT;
260 asmlinkage long sys_getdents64(unsigned int fd, struct linux_dirent64 __user * dirent, unsigned int count)
263 struct linux_dirent64 __user * lastdirent;
264 struct getdents_callback64 buf;
268 if (!access_ok(VERIFY_WRITE, dirent, count))
276 buf.current_dir = dirent;
281 error = vfs_readdir(file, filldir64, &buf);
285 lastdirent = buf.previous;
287 typeof(lastdirent->d_off) d_off = file->f_pos;
288 __put_user(d_off, &lastdirent->d_off);
289 error = count - buf.count;