OpenCores
URL https://opencores.org/ocsvn/or1k/or1k/trunk

Subversion Repositories or1k

[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [sysv/] [namei.c] - Blame information for rev 1765

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 1275 phoenix 
/*
2 
 *  linux/fs/sysv/namei.c
3 
 *
4 
 *  minix/namei.c
5 
 *  Copyright (C) 1991, 1992  Linus Torvalds
6 
 *
7 
 *  coh/namei.c
8 
 *  Copyright (C) 1993  Pascal Haible, Bruno Haible
9 
 *
10 
 *  sysv/namei.c
11 
 *  Copyright (C) 1993  Bruno Haible
12 
 *  Copyright (C) 1997, 1998  Krzysztof G. Baranowski
13 
 */
14 
 
15 
#include <linux/fs.h>
16 
#include <linux/sysv_fs.h>
17 
#include <linux/pagemap.h>
18 
 
19 
static inline void inc_count(struct inode *inode)
20 
{
21 
        inode->i_nlink++;
22 
        mark_inode_dirty(inode);
23 
}
24 
 
25 
static inline void dec_count(struct inode *inode)
26 
{
27 
        inode->i_nlink--;
28 
        mark_inode_dirty(inode);
29 
}
30 
 
31 
static int add_nondir(struct dentry *dentry, struct inode *inode)
32 
{
33 
        int err = sysv_add_link(dentry, inode);
34 
        if (!err) {
35 
                d_instantiate(dentry, inode);
36 
                return 0;
37 
        }
38 
        dec_count(inode);
39 
        iput(inode);
40 
        return err;
41 
}
42 
 
43 
static int sysv_hash(struct dentry *dentry, struct qstr *qstr)
44 
{
45 
        unsigned long hash;
46 
        int i;
47 
        const unsigned char *name;
48 
 
49 
        i = SYSV_NAMELEN;
50 
        if (i >= qstr->len)
51 
                return 0;
52 
        /* Truncate the name in place, avoids having to define a compare
53 
           function. */
54 
        qstr->len = i;
55 
        name = qstr->name;
56 
        hash = init_name_hash();
57 
        while (i--)
58 
                hash = partial_name_hash(*name++, hash);
59 
        qstr->hash = end_name_hash(hash);
60 
        return 0;
61 
}
62 
 
63 
struct dentry_operations sysv_dentry_operations = {
64 
        d_hash:         sysv_hash,
65 
};
66 
 
67 
static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry)
68 
{
69 
        struct inode * inode = NULL;
70 
        ino_t ino;
71 
 
72 
        dentry->d_op = dir->i_sb->s_root->d_op;
73 
        if (dentry->d_name.len > SYSV_NAMELEN)
74 
                return ERR_PTR(-ENAMETOOLONG);
75 
        ino = sysv_inode_by_name(dentry);
76 
 
77 
        if (ino) {
78 
                inode = iget(dir->i_sb, ino);
79 
                if (!inode)
80 
                        return ERR_PTR(-EACCES);
81 
        }
82 
        d_add(dentry, inode);
83 
        return NULL;
84 
}
85 
 
86 
static int sysv_mknod(struct inode * dir, struct dentry * dentry, int mode, int rdev)
87 
{
88 
        struct inode * inode = sysv_new_inode(dir, mode);
89 
        int err = PTR_ERR(inode);
90 
 
91 
        if (!IS_ERR(inode)) {
92 
                sysv_set_inode(inode, rdev);
93 
                mark_inode_dirty(inode);
94 
                err = add_nondir(dentry, inode);
95 
        }
96 
        return err;
97 
}
98 
 
99 
static int sysv_create(struct inode * dir, struct dentry * dentry, int mode)
100 
{
101 
        return sysv_mknod(dir, dentry, mode, 0);
102 
}
103 
 
104 
static int sysv_symlink(struct inode * dir, struct dentry * dentry,
105 
        const char * symname)
106 
{
107 
        int err = -ENAMETOOLONG;
108 
        int l = strlen(symname)+1;
109 
        struct inode * inode;
110 
 
111 
        if (l > dir->i_sb->s_blocksize)
112 
                goto out;
113 
 
114 
        inode = sysv_new_inode(dir, S_IFLNK|0777);
115 
        err = PTR_ERR(inode);
116 
        if (IS_ERR(inode))
117 
                goto out;
118 
 
119 
        sysv_set_inode(inode, 0);
120 
        err = block_symlink(inode, symname, l);
121 
        if (err)
122 
                goto out_fail;
123 
 
124 
        mark_inode_dirty(inode);
125 
        err = add_nondir(dentry, inode);
126 
out:
127 
        return err;
128 
 
129 
out_fail:
130 
        dec_count(inode);
131 
        iput(inode);
132 
        goto out;
133 
}
134 
 
135 
static int sysv_link(struct dentry * old_dentry, struct inode * dir,
136 
        struct dentry * dentry)
137 
{
138 
        struct inode *inode = old_dentry->d_inode;
139 
 
140 
        if (S_ISDIR(inode->i_mode))
141 
                return -EPERM;
142 
 
143 
        if (inode->i_nlink >= inode->i_sb->sv_link_max)
144 
                return -EMLINK;
145 
 
146 
        inode->i_ctime = CURRENT_TIME;
147 
        inc_count(inode);
148 
        atomic_inc(&inode->i_count);
149 
 
150 
        return add_nondir(dentry, inode);
151 
}
152 
 
153 
static int sysv_mkdir(struct inode * dir, struct dentry *dentry, int mode)
154 
{
155 
        struct inode * inode;
156 
        int err = -EMLINK;
157 
 
158 
        if (dir->i_nlink >= dir->i_sb->sv_link_max)
159 
                goto out;
160 
        inc_count(dir);
161 
 
162 
        inode = sysv_new_inode(dir, S_IFDIR|mode);
163 
        err = PTR_ERR(inode);
164 
        if (IS_ERR(inode))
165 
                goto out_dir;
166 
 
167 
        sysv_set_inode(inode, 0);
168 
 
169 
        inc_count(inode);
170 
 
171 
        err = sysv_make_empty(inode, dir);
172 
        if (err)
173 
                goto out_fail;
174 
 
175 
        err = sysv_add_link(dentry, inode);
176 
        if (err)
177 
                goto out_fail;
178 
 
179 
        d_instantiate(dentry, inode);
180 
out:
181 
        return err;
182 
 
183 
out_fail:
184 
        dec_count(inode);
185 
        dec_count(inode);
186 
        iput(inode);
187 
out_dir:
188 
        dec_count(dir);
189 
        goto out;
190 
}
191 
 
192 
static int sysv_unlink(struct inode * dir, struct dentry * dentry)
193 
{
194 
        struct inode * inode = dentry->d_inode;
195 
        struct page * page;
196 
        struct sysv_dir_entry * de;
197 
        int err = -ENOENT;
198 
 
199 
        de = sysv_find_entry(dentry, &page);
200 
        if (!de)
201 
                goto out;
202 
 
203 
        err = sysv_delete_entry (de, page);
204 
        if (err)
205 
                goto out;
206 
 
207 
        inode->i_ctime = dir->i_ctime;
208 
        dec_count(inode);
209 
out:
210 
        return err;
211 
}
212 
 
213 
static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
214 
{
215 
        struct inode *inode = dentry->d_inode;
216 
        int err = -ENOTEMPTY;
217 
 
218 
        if (sysv_empty_dir(inode)) {
219 
                err = sysv_unlink(dir, dentry);
220 
                if (!err) {
221 
                        inode->i_size = 0;
222 
                        dec_count(inode);
223 
                        dec_count(dir);
224 
                }
225 
        }
226 
        return err;
227 
}
228 
 
229 
/*
230 
 * Anybody can rename anything with this: the permission checks are left to the
231 
 * higher-level routines.
232 
 */
233 
static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
234 
                  struct inode * new_dir, struct dentry * new_dentry)
235 
{
236 
        struct inode * old_inode = old_dentry->d_inode;
237 
        struct inode * new_inode = new_dentry->d_inode;
238 
        struct page * dir_page = NULL;
239 
        struct sysv_dir_entry * dir_de = NULL;
240 
        struct page * old_page;
241 
        struct sysv_dir_entry * old_de;
242 
        int err = -ENOENT;
243 
 
244 
        old_de = sysv_find_entry(old_dentry, &old_page);
245 
        if (!old_de)
246 
                goto out;
247 
 
248 
        if (S_ISDIR(old_inode->i_mode)) {
249 
                err = -EIO;
250 
                dir_de = sysv_dotdot(old_inode, &dir_page);
251 
                if (!dir_de)
252 
                        goto out_old;
253 
        }
254 
 
255 
        if (new_inode) {
256 
                struct page * new_page;
257 
                struct sysv_dir_entry * new_de;
258 
 
259 
                err = -ENOTEMPTY;
260 
                if (dir_de && !sysv_empty_dir(new_inode))
261 
                        goto out_dir;
262 
 
263 
                err = -ENOENT;
264 
                new_de = sysv_find_entry(new_dentry, &new_page);
265 
                if (!new_de)
266 
                        goto out_dir;
267 
                inc_count(old_inode);
268 
                sysv_set_link(new_de, new_page, old_inode);
269 
                new_inode->i_ctime = CURRENT_TIME;
270 
                if (dir_de)
271 
                        new_inode->i_nlink--;
272 
                dec_count(new_inode);
273 
        } else {
274 
                if (dir_de) {
275 
                        err = -EMLINK;
276 
                        if (new_dir->i_nlink >= new_dir->i_sb->sv_link_max)
277 
                                goto out_dir;
278 
                }
279 
                inc_count(old_inode);
280 
                err = sysv_add_link(new_dentry, old_inode);
281 
                if (err) {
282 
                        dec_count(old_inode);
283 
                        goto out_dir;
284 
                }
285 
                if (dir_de)
286 
                        inc_count(new_dir);
287 
        }
288 
 
289 
        sysv_delete_entry(old_de, old_page);
290 
        dec_count(old_inode);
291 
 
292 
        if (dir_de) {
293 
                sysv_set_link(dir_de, dir_page, new_dir);
294 
                dec_count(old_dir);
295 
        }
296 
        return 0;
297 
 
298 
out_dir:
299 
        if (dir_de) {
300 
                kunmap(dir_page);
301 
                page_cache_release(dir_page);
302 
        }
303 
out_old:
304 
        kunmap(old_page);
305 
        page_cache_release(old_page);
306 
out:
307 
        return err;
308 
}
309 
 
310 
/*
311 
 * directories can handle most operations...
312 
 */
313 
struct inode_operations sysv_dir_inode_operations = {
314 
        create:         sysv_create,
315 
        lookup:         sysv_lookup,
316 
        link:           sysv_link,
317 
        unlink:         sysv_unlink,
318 
        symlink:        sysv_symlink,
319 
        mkdir:          sysv_mkdir,
320 
        rmdir:          sysv_rmdir,
321 
        mknod:          sysv_mknod,
322 
        rename:         sysv_rename,
323 
};

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.