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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [readdir.c] - Blame information for rev 79

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Line No. Rev Author Line
1 62 marcus.erl 
/*
2 
 *  linux/fs/readdir.c
3 
 *
4 
 *  Copyright (C) 1995  Linus Torvalds
5 
 */
6 
 
7 
#include <linux/kernel.h>
8 
#include <linux/module.h>
9 
#include <linux/time.h>
10 
#include <linux/mm.h>
11 
#include <linux/errno.h>
12 
#include <linux/stat.h>
13 
#include <linux/file.h>
14 
#include <linux/fs.h>
15 
#include <linux/dirent.h>
16 
#include <linux/security.h>
17 
#include <linux/syscalls.h>
18 
#include <linux/unistd.h>
19 
 
20 
#include <asm/uaccess.h>
21 
 
22 
int vfs_readdir(struct file *file, filldir_t filler, void *buf)
23 
{
24 
        struct inode *inode = file->f_path.dentry->d_inode;
25 
        int res = -ENOTDIR;
26 
        if (!file->f_op || !file->f_op->readdir)
27 
                goto out;
28 
 
29 
        res = security_file_permission(file, MAY_READ);
30 
        if (res)
31 
                goto out;
32 
 
33 
        mutex_lock(&inode->i_mutex);
34 
        res = -ENOENT;
35 
        if (!IS_DEADDIR(inode)) {
36 
                res = file->f_op->readdir(file, buf, filler);
37 
                file_accessed(file);
38 
        }
39 
        mutex_unlock(&inode->i_mutex);
40 
out:
41 
        return res;
42 
}
43 
 
44 
EXPORT_SYMBOL(vfs_readdir);
45 
 
46 
/*
47 
 * Traditional linux readdir() handling..
48 
 *
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).
53 
 */
54 
#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
55 
 
56 
#ifdef __ARCH_WANT_OLD_READDIR
57 
 
58 
struct old_linux_dirent {
59 
        unsigned long   d_ino;
60 
        unsigned long   d_offset;
61 
        unsigned short  d_namlen;
62 
        char            d_name[1];
63 
};
64 
 
65 
struct readdir_callback {
66 
        struct old_linux_dirent __user * dirent;
67 
        int result;
68 
};
69 
 
70 
static int fillonedir(void * __buf, const char * name, int namlen, loff_t offset,
71 
                      u64 ino, unsigned int d_type)
72 
{
73 
        struct readdir_callback * buf = (struct readdir_callback *) __buf;
74 
        struct old_linux_dirent __user * dirent;
75 
        unsigned long d_ino;
76 
 
77 
        if (buf->result)
78 
                return -EINVAL;
79 
        d_ino = ino;
80 
        if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
81 
                return -EOVERFLOW;
82 
        buf->result++;
83 
        dirent = buf->dirent;
84 
        if (!access_ok(VERIFY_WRITE, dirent,
85 
                        (unsigned long)(dirent->d_name + namlen + 1) -
86 
                                (unsigned long)dirent))
87 
                goto efault;
88 
        if (    __put_user(d_ino, &dirent->d_ino) ||
89 
                __put_user(offset, &dirent->d_offset) ||
90 
                __put_user(namlen, &dirent->d_namlen) ||
91 
                __copy_to_user(dirent->d_name, name, namlen) ||
92 
                __put_user(0, dirent->d_name + namlen))
93 
                goto efault;
94 
        return 0;
95 
efault:
96 
        buf->result = -EFAULT;
97 
        return -EFAULT;
98 
}
99 
 
100 
asmlinkage long old_readdir(unsigned int fd, struct old_linux_dirent __user * dirent, unsigned int count)
101 
{
102 
        int error;
103 
        struct file * file;
104 
        struct readdir_callback buf;
105 
 
106 
        error = -EBADF;
107 
        file = fget(fd);
108 
        if (!file)
109 
                goto out;
110 
 
111 
        buf.result = 0;
112 
        buf.dirent = dirent;
113 
 
114 
        error = vfs_readdir(file, fillonedir, &buf);
115 
        if (error >= 0)
116 
                error = buf.result;
117 
 
118 
        fput(file);
119 
out:
120 
        return error;
121 
}
122 
 
123 
#endif /* __ARCH_WANT_OLD_READDIR */
124 
 
125 
/*
126 
 * New, all-improved, singing, dancing, iBCS2-compliant getdents()
127 
 * interface.
128 
 */
129 
struct linux_dirent {
130 
        unsigned long   d_ino;
131 
        unsigned long   d_off;
132 
        unsigned short  d_reclen;
133 
        char            d_name[1];
134 
};
135 
 
136 
struct getdents_callback {
137 
        struct linux_dirent __user * current_dir;
138 
        struct linux_dirent __user * previous;
139 
        int count;
140 
        int error;
141 
};
142 
 
143 
static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
144 
                   u64 ino, unsigned int d_type)
145 
{
146 
        struct linux_dirent __user * dirent;
147 
        struct getdents_callback * buf = (struct getdents_callback *) __buf;
148 
        unsigned long d_ino;
149 
        int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(long));
150 
 
151 
        buf->error = -EINVAL;   /* only used if we fail.. */
152 
        if (reclen > buf->count)
153 
                return -EINVAL;
154 
        d_ino = ino;
155 
        if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
156 
                return -EOVERFLOW;
157 
        dirent = buf->previous;
158 
        if (dirent) {
159 
                if (__put_user(offset, &dirent->d_off))
160 
                        goto efault;
161 
        }
162 
        dirent = buf->current_dir;
163 
        if (__put_user(d_ino, &dirent->d_ino))
164 
                goto efault;
165 
        if (__put_user(reclen, &dirent->d_reclen))
166 
                goto efault;
167 
        if (copy_to_user(dirent->d_name, name, namlen))
168 
                goto efault;
169 
        if (__put_user(0, dirent->d_name + namlen))
170 
                goto efault;
171 
        if (__put_user(d_type, (char __user *) dirent + reclen - 1))
172 
                goto efault;
173 
        buf->previous = dirent;
174 
        dirent = (void __user *)dirent + reclen;
175 
        buf->current_dir = dirent;
176 
        buf->count -= reclen;
177 
        return 0;
178 
efault:
179 
        buf->error = -EFAULT;
180 
        return -EFAULT;
181 
}
182 
 
183 
asmlinkage long sys_getdents(unsigned int fd, struct linux_dirent __user * dirent, unsigned int count)
184 
{
185 
        struct file * file;
186 
        struct linux_dirent __user * lastdirent;
187 
        struct getdents_callback buf;
188 
        int error;
189 
 
190 
        error = -EFAULT;
191 
        if (!access_ok(VERIFY_WRITE, dirent, count))
192 
                goto out;
193 
 
194 
        error = -EBADF;
195 
        file = fget(fd);
196 
        if (!file)
197 
                goto out;
198 
 
199 
        buf.current_dir = dirent;
200 
        buf.previous = NULL;
201 
        buf.count = count;
202 
        buf.error = 0;
203 
 
204 
        error = vfs_readdir(file, filldir, &buf);
205 
        if (error < 0)
206 
                goto out_putf;
207 
        error = buf.error;
208 
        lastdirent = buf.previous;
209 
        if (lastdirent) {
210 
                if (put_user(file->f_pos, &lastdirent->d_off))
211 
                        error = -EFAULT;
212 
                else
213 
                        error = count - buf.count;
214 
        }
215 
 
216 
out_putf:
217 
        fput(file);
218 
out:
219 
        return error;
220 
}
221 
 
222 
struct getdents_callback64 {
223 
        struct linux_dirent64 __user * current_dir;
224 
        struct linux_dirent64 __user * previous;
225 
        int count;
226 
        int error;
227 
};
228 
 
229 
static int filldir64(void * __buf, const char * name, int namlen, loff_t offset,
230 
                     u64 ino, unsigned int d_type)
231 
{
232 
        struct linux_dirent64 __user *dirent;
233 
        struct getdents_callback64 * buf = (struct getdents_callback64 *) __buf;
234 
        int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 1, sizeof(u64));
235 
 
236 
        buf->error = -EINVAL;   /* only used if we fail.. */
237 
        if (reclen > buf->count)
238 
                return -EINVAL;
239 
        dirent = buf->previous;
240 
        if (dirent) {
241 
                if (__put_user(offset, &dirent->d_off))
242 
                        goto efault;
243 
        }
244 
        dirent = buf->current_dir;
245 
        if (__put_user(ino, &dirent->d_ino))
246 
                goto efault;
247 
        if (__put_user(0, &dirent->d_off))
248 
                goto efault;
249 
        if (__put_user(reclen, &dirent->d_reclen))
250 
                goto efault;
251 
        if (__put_user(d_type, &dirent->d_type))
252 
                goto efault;
253 
        if (copy_to_user(dirent->d_name, name, namlen))
254 
                goto efault;
255 
        if (__put_user(0, dirent->d_name + namlen))
256 
                goto efault;
257 
        buf->previous = dirent;
258 
        dirent = (void __user *)dirent + reclen;
259 
        buf->current_dir = dirent;
260 
        buf->count -= reclen;
261 
        return 0;
262 
efault:
263 
        buf->error = -EFAULT;
264 
        return -EFAULT;
265 
}
266 
 
267 
asmlinkage long sys_getdents64(unsigned int fd, struct linux_dirent64 __user * dirent, unsigned int count)
268 
{
269 
        struct file * file;
270 
        struct linux_dirent64 __user * lastdirent;
271 
        struct getdents_callback64 buf;
272 
        int error;
273 
 
274 
        error = -EFAULT;
275 
        if (!access_ok(VERIFY_WRITE, dirent, count))
276 
                goto out;
277 
 
278 
        error = -EBADF;
279 
        file = fget(fd);
280 
        if (!file)
281 
                goto out;
282 
 
283 
        buf.current_dir = dirent;
284 
        buf.previous = NULL;
285 
        buf.count = count;
286 
        buf.error = 0;
287 
 
288 
        error = vfs_readdir(file, filldir64, &buf);
289 
        if (error < 0)
290 
                goto out_putf;
291 
        error = buf.error;
292 
        lastdirent = buf.previous;
293 
        if (lastdirent) {
294 
                typeof(lastdirent->d_off) d_off = file->f_pos;
295 
                error = -EFAULT;
296 
                if (__put_user(d_off, &lastdirent->d_off))
297 
                        goto out_putf;
298 
                error = count - buf.count;
299 
        }
300 
 
301 
out_putf:
302 
        fput(file);
303 
out:
304 
        return error;
305 
}

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