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

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/*
 *  linux/fs/minix/namei.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */
 
#include <linux/fs.h>
#include <linux/minix_fs.h>
#include <linux/pagemap.h>
 
static inline void inc_count(struct inode *inode)
{
        inode->i_nlink++;
        mark_inode_dirty(inode);
}
 
static inline void dec_count(struct inode *inode)
{
        inode->i_nlink--;
        mark_inode_dirty(inode);
}
 
static int add_nondir(struct dentry *dentry, struct inode *inode)
{
        int err = minix_add_link(dentry, inode);
        if (!err) {
                d_instantiate(dentry, inode);
                return 0;
        }
        dec_count(inode);
        iput(inode);
        return err;
}
 
static int minix_hash(struct dentry *dentry, struct qstr *qstr)
{
        unsigned long hash;
        int i;
        const unsigned char *name;
 
        i = dentry->d_inode->i_sb->u.minix_sb.s_namelen;
        if (i >= qstr->len)
                return 0;
        /* Truncate the name in place, avoids having to define a compare
           function. */
        qstr->len = i;
        name = qstr->name;
        hash = init_name_hash();
        while (i--)
                hash = partial_name_hash(*name++, hash);
        qstr->hash = end_name_hash(hash);
        return 0;
}
 
struct dentry_operations minix_dentry_operations = {
        d_hash:         minix_hash,
};
 
static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry)
{
        struct inode * inode = NULL;
        ino_t ino;
 
        dentry->d_op = dir->i_sb->s_root->d_op;
 
        if (dentry->d_name.len > dir->i_sb->u.minix_sb.s_namelen)
                return ERR_PTR(-ENAMETOOLONG);
 
        ino = minix_inode_by_name(dentry);
        if (ino) {
                inode = iget(dir->i_sb, ino);
 
                if (!inode)
                        return ERR_PTR(-EACCES);
        }
        d_add(dentry, inode);
        return NULL;
}
 
static int minix_mknod(struct inode * dir, struct dentry *dentry, int mode, int rdev)
{
        int error;
        struct inode * inode = minix_new_inode(dir, &error);
 
        if (inode) {
                inode->i_mode = mode;
                minix_set_inode(inode, rdev);
                mark_inode_dirty(inode);
                error = add_nondir(dentry, inode);
        }
        return error;
}
 
static int minix_create(struct inode * dir, struct dentry *dentry, int mode)
{
        return minix_mknod(dir, dentry, mode, 0);
}
 
static int minix_symlink(struct inode * dir, struct dentry *dentry,
          const char * symname)
{
        int err = -ENAMETOOLONG;
        int i = strlen(symname)+1;
        struct inode * inode;
 
        if (i > dir->i_sb->s_blocksize)
                goto out;
 
        inode = minix_new_inode(dir, &err);
        if (!inode)
                goto out;
 
        inode->i_mode = S_IFLNK | 0777;
        minix_set_inode(inode, 0);
        err = block_symlink(inode, symname, i);
        if (err)
                goto out_fail;
 
        err = add_nondir(dentry, inode);
out:
        return err;
 
out_fail:
        dec_count(inode);
        iput(inode);
        goto out;
}
 
static int minix_link(struct dentry * old_dentry, struct inode * dir,
        struct dentry *dentry)
{
        struct inode *inode = old_dentry->d_inode;
 
        if (S_ISDIR(inode->i_mode))
                return -EPERM;
 
        if (inode->i_nlink >= inode->i_sb->u.minix_sb.s_link_max)
                return -EMLINK;
 
        inode->i_ctime = CURRENT_TIME;
        inc_count(inode);
        atomic_inc(&inode->i_count);
        return add_nondir(dentry, inode);
}
 
static int minix_mkdir(struct inode * dir, struct dentry *dentry, int mode)
{
        struct inode * inode;
        int err = -EMLINK;
 
        if (dir->i_nlink >= dir->i_sb->u.minix_sb.s_link_max)
                goto out;
 
        inc_count(dir);
 
        inode = minix_new_inode(dir, &err);
        if (!inode)
                goto out_dir;
 
        inode->i_mode = S_IFDIR | mode;
        if (dir->i_mode & S_ISGID)
                inode->i_mode |= S_ISGID;
        minix_set_inode(inode, 0);
 
        inc_count(inode);
 
        err = minix_make_empty(inode, dir);
        if (err)
                goto out_fail;
 
        err = minix_add_link(dentry, inode);
        if (err)
                goto out_fail;
 
        d_instantiate(dentry, inode);
out:
        return err;
 
out_fail:
        dec_count(inode);
        dec_count(inode);
        iput(inode);
out_dir:
        dec_count(dir);
        goto out;
}
 
static int minix_unlink(struct inode * dir, struct dentry *dentry)
{
        int err = -ENOENT;
        struct inode * inode = dentry->d_inode;
        struct page * page;
        struct minix_dir_entry * de;
 
        de = minix_find_entry(dentry, &page);
        if (!de)
                goto end_unlink;
 
        err = minix_delete_entry(de, page);
        if (err)
                goto end_unlink;
 
        inode->i_ctime = dir->i_ctime;
        dec_count(inode);
end_unlink:
        return err;
}
 
static int minix_rmdir(struct inode * dir, struct dentry *dentry)
{
        struct inode * inode = dentry->d_inode;
        int err = -ENOTEMPTY;
 
        if (minix_empty_dir(inode)) {
                err = minix_unlink(dir, dentry);
                if (!err) {
                        dec_count(dir);
                        dec_count(inode);
                }
        }
        return err;
}
 
static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
                           struct inode * new_dir, struct dentry *new_dentry)
{
        struct minix_sb_info * info = &old_dir->i_sb->u.minix_sb;
        struct inode * old_inode = old_dentry->d_inode;
        struct inode * new_inode = new_dentry->d_inode;
        struct page * dir_page = NULL;
        struct minix_dir_entry * dir_de = NULL;
        struct page * old_page;
        struct minix_dir_entry * old_de;
        int err = -ENOENT;
 
        old_de = minix_find_entry(old_dentry, &old_page);
        if (!old_de)
                goto out;
 
        if (S_ISDIR(old_inode->i_mode)) {
                err = -EIO;
                dir_de = minix_dotdot(old_inode, &dir_page);
                if (!dir_de)
                        goto out_old;
        }
 
        if (new_inode) {
                struct page * new_page;
                struct minix_dir_entry * new_de;
 
                err = -ENOTEMPTY;
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_page);
                if (!new_de)
                        goto out_dir;
                inc_count(old_inode);
                minix_set_link(new_de, new_page, old_inode);
                new_inode->i_ctime = CURRENT_TIME;
                if (dir_de)
                        new_inode->i_nlink--;
                dec_count(new_inode);
        } else {
                if (dir_de) {
                        err = -EMLINK;
                        if (new_dir->i_nlink >= info->s_link_max)
                                goto out_dir;
                }
                inc_count(old_inode);
                err = minix_add_link(new_dentry, old_inode);
                if (err) {
                        dec_count(old_inode);
                        goto out_dir;
                }
                if (dir_de)
                        inc_count(new_dir);
        }
 
        minix_delete_entry(old_de, old_page);
        dec_count(old_inode);
 
        if (dir_de) {
                minix_set_link(dir_de, dir_page, new_dir);
                dec_count(old_dir);
        }
        return 0;
 
out_dir:
        if (dir_de) {
                kunmap(dir_page);
                page_cache_release(dir_page);
        }
out_old:
        kunmap(old_page);
        page_cache_release(old_page);
out:
        return err;
}
 
/*
 * directories can handle most operations...
 */
struct inode_operations minix_dir_inode_operations = {
        create:         minix_create,
        lookup:         minix_lookup,
        link:           minix_link,
        unlink:         minix_unlink,
        symlink:        minix_symlink,
        mkdir:          minix_mkdir,
        rmdir:          minix_rmdir,
        mknod:          minix_mknod,
        rename:         minix_rename,
};

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

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