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

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/*
 * linux/fs/ufs/namei.c
 *
 * Copyright (C) 1998
 * Daniel Pirkl <daniel.pirkl@email.cz>
 * Charles University, Faculty of Mathematics and Physics
 *
 *  from
 *
 *  linux/fs/ext2/namei.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/namei.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */
 
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/ufs_fs.h>
 
#undef UFS_NAMEI_DEBUG
 
#ifdef UFS_NAMEI_DEBUG
#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;
#else
#define UFSD(x)
#endif
 
static inline void ufs_inc_count(struct inode *inode)
{
        inode->i_nlink++;
        mark_inode_dirty(inode);
}
 
static inline void ufs_dec_count(struct inode *inode)
{
        inode->i_nlink--;
        mark_inode_dirty(inode);
}
 
static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
{
        int err = ufs_add_link(dentry, inode);
        if (!err) {
                d_instantiate(dentry, inode);
                return 0;
        }
        ufs_dec_count(inode);
        iput(inode);
        return err;
}
 
static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry)
{
        struct inode * inode = NULL;
        ino_t ino;
 
        if (dentry->d_name.len > UFS_MAXNAMLEN)
                return ERR_PTR(-ENAMETOOLONG);
 
        ino = ufs_inode_by_name(dir, dentry);
        if (ino) {
                inode = iget(dir->i_sb, ino);
                if (!inode)
                        return ERR_PTR(-EACCES);
        }
        d_add(dentry, inode);
        return NULL;
}
 
/*
 * By the time this is called, we already have created
 * the directory cache entry for the new file, but it
 * is so far negative - it has no inode.
 *
 * If the create succeeds, we fill in the inode information
 * with d_instantiate().
 */
static int ufs_create (struct inode * dir, struct dentry * dentry, int mode)
{
        struct inode * inode = ufs_new_inode(dir, mode);
        int err = PTR_ERR(inode);
        if (!IS_ERR(inode)) {
                inode->i_op = &ufs_file_inode_operations;
                inode->i_fop = &ufs_file_operations;
                inode->i_mapping->a_ops = &ufs_aops;
                mark_inode_dirty(inode);
                err = ufs_add_nondir(dentry, inode);
        }
        return err;
}
 
static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
{
        struct inode * inode = ufs_new_inode(dir, mode);
        int err = PTR_ERR(inode);
        if (!IS_ERR(inode)) {
                init_special_inode(inode, mode, rdev);
                mark_inode_dirty(inode);
                err = ufs_add_nondir(dentry, inode);
        }
        return err;
}
 
static int ufs_symlink (struct inode * dir, struct dentry * dentry,
        const char * symname)
{
        struct super_block * sb = dir->i_sb;
        int err = -ENAMETOOLONG;
        unsigned l = strlen(symname)+1;
        struct inode * inode;
 
        if (l > sb->s_blocksize)
                goto out;
 
        inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
        err = PTR_ERR(inode);
        if (IS_ERR(inode))
                goto out;
 
        if (l > sb->u.ufs_sb.s_uspi->s_maxsymlinklen) {
                /* slow symlink */
                inode->i_op = &page_symlink_inode_operations;
                inode->i_mapping->a_ops = &ufs_aops;
                err = block_symlink(inode, symname, l);
                if (err)
                        goto out_fail;
        } else {
                /* fast symlink */
                inode->i_op = &ufs_fast_symlink_inode_operations;
                memcpy((char*)&inode->u.ufs_i.i_u1.i_data,symname,l);
                inode->i_size = l-1;
        }
        mark_inode_dirty(inode);
 
        err = ufs_add_nondir(dentry, inode);
out:
        return err;
 
out_fail:
        ufs_dec_count(inode);
        iput(inode);
        goto out;
}
 
static int ufs_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 >= UFS_LINK_MAX)
                return -EMLINK;
 
        inode->i_ctime = CURRENT_TIME;
        ufs_inc_count(inode);
        atomic_inc(&inode->i_count);
 
        return ufs_add_nondir(dentry, inode);
}
 
static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
{
        struct inode * inode;
        int err = -EMLINK;
 
        if (dir->i_nlink >= UFS_LINK_MAX)
                goto out;
 
        ufs_inc_count(dir);
 
        inode = ufs_new_inode(dir, S_IFDIR|mode);
        err = PTR_ERR(inode);
        if (IS_ERR(inode))
                goto out_dir;
 
        inode->i_op = &ufs_dir_inode_operations;
        inode->i_fop = &ufs_dir_operations;
 
        ufs_inc_count(inode);
 
        err = ufs_make_empty(inode, dir);
        if (err)
                goto out_fail;
 
        err = ufs_add_link(dentry, inode);
        if (err)
                goto out_fail;
 
        d_instantiate(dentry, inode);
out:
        return err;
 
out_fail:
        ufs_dec_count(inode);
        ufs_dec_count(inode);
        iput (inode);
out_dir:
        ufs_dec_count(dir);
        goto out;
}
 
static int ufs_unlink(struct inode * dir, struct dentry *dentry)
{
        struct inode * inode = dentry->d_inode;
        struct buffer_head * bh;
        struct ufs_dir_entry * de;
        int err = -ENOENT;
 
        de = ufs_find_entry (dentry, &bh);
        if (!de)
                goto out;
 
        err = ufs_delete_entry (dir, de, bh);
        if (err)
                goto out;
 
        inode->i_ctime = dir->i_ctime;
        ufs_dec_count(inode);
        err = 0;
out:
        return err;
}
 
static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
{
        struct inode * inode = dentry->d_inode;
        int err= -ENOTEMPTY;
 
        if (ufs_empty_dir (inode)) {
                err = ufs_unlink(dir, dentry);
                if (!err) {
                        inode->i_size = 0;
                        ufs_dec_count(inode);
                        ufs_dec_count(dir);
                }
        }
        return err;
}
 
static int ufs_rename (struct inode * old_dir, struct dentry * old_dentry,
        struct inode * new_dir, struct dentry * new_dentry )
{
        struct inode *old_inode = old_dentry->d_inode;
        struct inode *new_inode = new_dentry->d_inode;
        struct buffer_head *dir_bh = NULL;
        struct ufs_dir_entry *dir_de = NULL;
        struct buffer_head *old_bh;
        struct ufs_dir_entry *old_de;
        int err = -ENOENT;
 
        old_de = ufs_find_entry (old_dentry, &old_bh);
        if (!old_de)
                goto out;
 
        if (S_ISDIR(old_inode->i_mode)) {
                err = -EIO;
                dir_de = ufs_dotdot(old_inode, &dir_bh);
                if (!dir_de)
                        goto out_old;
        }
 
        if (new_inode) {
                struct buffer_head *new_bh;
                struct ufs_dir_entry *new_de;
 
                err = -ENOTEMPTY;
                if (dir_de && !ufs_empty_dir (new_inode))
                        goto out_dir;
                err = -ENOENT;
                new_de = ufs_find_entry (new_dentry, &new_bh);
                if (!new_de)
                        goto out_dir;
                ufs_inc_count(old_inode);
                ufs_set_link(new_dir, new_de, new_bh, old_inode);
                new_inode->i_ctime = CURRENT_TIME;
                if (dir_de)
                        new_inode->i_nlink--;
                ufs_dec_count(new_inode);
        } else {
                if (dir_de) {
                        err = -EMLINK;
                        if (new_dir->i_nlink >= UFS_LINK_MAX)
                                goto out_dir;
                }
                ufs_inc_count(old_inode);
                err = ufs_add_link(new_dentry, old_inode);
                if (err) {
                        ufs_dec_count(old_inode);
                        goto out_dir;
                }
                if (dir_de)
                        ufs_inc_count(new_dir);
        }
 
        ufs_delete_entry (old_dir, old_de, old_bh);
 
        ufs_dec_count(old_inode);
 
        if (dir_de) {
                ufs_set_link(old_inode, dir_de, dir_bh, new_dir);
                ufs_dec_count(old_dir);
        }
        return 0;
 
out_dir:
        if (dir_de)
                brelse(dir_bh);
out_old:
        brelse (old_bh);
out:
        return err;
}
 
struct inode_operations ufs_dir_inode_operations = {
        create:         ufs_create,
        lookup:         ufs_lookup,
        link:           ufs_link,
        unlink:         ufs_unlink,
        symlink:        ufs_symlink,
        mkdir:          ufs_mkdir,
        rmdir:          ufs_rmdir,
        mknod:          ufs_mknod,
        rename:         ufs_rename,
};

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

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/fs/ufs/namei.c`
3			`*`
4			`* Copyright (C) 1998`
5			`* Daniel Pirkl <daniel.pirkl@email.cz>`
6			`* Charles University, Faculty of Mathematics and Physics`
7			`*`
8			`* from`
9			`*`
10			`* linux/fs/ext2/namei.c`
11			`*`
12			`* Copyright (C) 1992, 1993, 1994, 1995`
13			`* Remy Card (card@masi.ibp.fr)`
14			`* Laboratoire MASI - Institut Blaise Pascal`
15			`* Universite Pierre et Marie Curie (Paris VI)`
16			`*`
17			`* from`
18			`*`
19			`* linux/fs/minix/namei.c`
20			`*`
21			`* Copyright (C) 1991, 1992 Linus Torvalds`
22			`*`
23			`* Big-endian to little-endian byte-swapping/bitmaps by`
24			`* David S. Miller (davem@caip.rutgers.edu), 1995`
25			`*/`
26
27			`#include <linux/sched.h>`
28			`#include <linux/fs.h>`
29			`#include <linux/ufs_fs.h>`
30
31			`#undef UFS_NAMEI_DEBUG`
32
33			`#ifdef UFS_NAMEI_DEBUG`
34			`#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;`
35			`#else`
36			`#define UFSD(x)`
37			`#endif`
38
39			`static inline void ufs_inc_count(struct inode *inode)`
40			`{`
41			`inode->i_nlink++;`
42			`mark_inode_dirty(inode);`
43			`}`
44
45			`static inline void ufs_dec_count(struct inode *inode)`
46			`{`
47			`inode->i_nlink--;`
48			`mark_inode_dirty(inode);`
49			`}`
50
51			`static inline int ufs_add_nondir(struct dentry dentry, struct inode inode)`
52			`{`
53			`int err = ufs_add_link(dentry, inode);`
54			`if (!err) {`
55			`d_instantiate(dentry, inode);`
56			`return 0;`
57			`}`
58			`ufs_dec_count(inode);`
59			`iput(inode);`
60			`return err;`
61			`}`
62
63			`static struct dentry ufs_lookup(struct inode dir, struct dentry *dentry)`
64			`{`
65			`struct inode * inode = NULL;`
66			`ino_t ino;`
67
68			`if (dentry->d_name.len > UFS_MAXNAMLEN)`
69			`return ERR_PTR(-ENAMETOOLONG);`
70
71			`ino = ufs_inode_by_name(dir, dentry);`
72			`if (ino) {`
73			`inode = iget(dir->i_sb, ino);`
74			`if (!inode)`
75			`return ERR_PTR(-EACCES);`
76			`}`
77			`d_add(dentry, inode);`
78			`return NULL;`
79			`}`
80
81			`/*`
82			`* By the time this is called, we already have created`
83			`* the directory cache entry for the new file, but it`
84			`* is so far negative - it has no inode.`
85			`*`
86			`* If the create succeeds, we fill in the inode information`
87			`* with d_instantiate().`
88			`*/`
89			`static int ufs_create (struct inode * dir, struct dentry * dentry, int mode)`
90			`{`
91			`struct inode * inode = ufs_new_inode(dir, mode);`
92			`int err = PTR_ERR(inode);`
93			`if (!IS_ERR(inode)) {`
94			`inode->i_op = &ufs_file_inode_operations;`
95			`inode->i_fop = &ufs_file_operations;`
96			`inode->i_mapping->a_ops = &ufs_aops;`
97			`mark_inode_dirty(inode);`
98			`err = ufs_add_nondir(dentry, inode);`
99			`}`
100			`return err;`
101			`}`
102
103			`static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)`
104			`{`
105			`struct inode * inode = ufs_new_inode(dir, mode);`
106			`int err = PTR_ERR(inode);`
107			`if (!IS_ERR(inode)) {`
108			`init_special_inode(inode, mode, rdev);`
109			`mark_inode_dirty(inode);`
110			`err = ufs_add_nondir(dentry, inode);`
111			`}`
112			`return err;`
113			`}`
114
115			`static int ufs_symlink (struct inode * dir, struct dentry * dentry,`
116			`const char * symname)`
117			`{`
118			`struct super_block * sb = dir->i_sb;`
119			`int err = -ENAMETOOLONG;`
120			`unsigned l = strlen(symname)+1;`
121			`struct inode * inode;`
122
123			`if (l > sb->s_blocksize)`
124			`goto out;`
125
126			`inode = ufs_new_inode(dir, S_IFLNK \| S_IRWXUGO);`
127			`err = PTR_ERR(inode);`
128			`if (IS_ERR(inode))`
129			`goto out;`
130
131			`if (l > sb->u.ufs_sb.s_uspi->s_maxsymlinklen) {`
132			`/* slow symlink */`
133			`inode->i_op = &page_symlink_inode_operations;`
134			`inode->i_mapping->a_ops = &ufs_aops;`
135			`err = block_symlink(inode, symname, l);`
136			`if (err)`
137			`goto out_fail;`
138			`} else {`
139			`/* fast symlink */`
140			`inode->i_op = &ufs_fast_symlink_inode_operations;`
141			`memcpy((char*)&inode->u.ufs_i.i_u1.i_data,symname,l);`
142			`inode->i_size = l-1;`
143			`}`
144			`mark_inode_dirty(inode);`
145
146			`err = ufs_add_nondir(dentry, inode);`
147			`out:`
148			`return err;`
149
150			`out_fail:`
151			`ufs_dec_count(inode);`
152			`iput(inode);`
153			`goto out;`
154			`}`
155
156			`static int ufs_link (struct dentry * old_dentry, struct inode * dir,`
157			`struct dentry *dentry)`
158			`{`
159			`struct inode *inode = old_dentry->d_inode;`
160
161			`if (S_ISDIR(inode->i_mode))`
162			`return -EPERM;`
163
164			`if (inode->i_nlink >= UFS_LINK_MAX)`
165			`return -EMLINK;`
166
167			`inode->i_ctime = CURRENT_TIME;`
168			`ufs_inc_count(inode);`
169			`atomic_inc(&inode->i_count);`
170
171			`return ufs_add_nondir(dentry, inode);`
172			`}`
173
174			`static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)`
175			`{`
176			`struct inode * inode;`
177			`int err = -EMLINK;`
178
179			`if (dir->i_nlink >= UFS_LINK_MAX)`
180			`goto out;`
181
182			`ufs_inc_count(dir);`
183
184			`inode = ufs_new_inode(dir, S_IFDIR\|mode);`
185			`err = PTR_ERR(inode);`
186			`if (IS_ERR(inode))`
187			`goto out_dir;`
188
189			`inode->i_op = &ufs_dir_inode_operations;`
190			`inode->i_fop = &ufs_dir_operations;`
191
192			`ufs_inc_count(inode);`
193
194			`err = ufs_make_empty(inode, dir);`
195			`if (err)`
196			`goto out_fail;`
197
198			`err = ufs_add_link(dentry, inode);`
199			`if (err)`
200			`goto out_fail;`
201
202			`d_instantiate(dentry, inode);`
203			`out:`
204			`return err;`
205
206			`out_fail:`
207			`ufs_dec_count(inode);`
208			`ufs_dec_count(inode);`
209			`iput (inode);`
210			`out_dir:`
211			`ufs_dec_count(dir);`
212			`goto out;`
213			`}`
214
215			`static int ufs_unlink(struct inode * dir, struct dentry *dentry)`
216			`{`
217			`struct inode * inode = dentry->d_inode;`
218			`struct buffer_head * bh;`
219			`struct ufs_dir_entry * de;`
220			`int err = -ENOENT;`
221
222			`de = ufs_find_entry (dentry, &bh);`
223			`if (!de)`
224			`goto out;`
225
226			`err = ufs_delete_entry (dir, de, bh);`
227			`if (err)`
228			`goto out;`
229
230			`inode->i_ctime = dir->i_ctime;`
231			`ufs_dec_count(inode);`
232			`err = 0;`
233			`out:`
234			`return err;`
235			`}`
236
237			`static int ufs_rmdir (struct inode * dir, struct dentry *dentry)`
238			`{`
239			`struct inode * inode = dentry->d_inode;`
240			`int err= -ENOTEMPTY;`
241
242			`if (ufs_empty_dir (inode)) {`
243			`err = ufs_unlink(dir, dentry);`
244			`if (!err) {`
245			`inode->i_size = 0;`
246			`ufs_dec_count(inode);`
247			`ufs_dec_count(dir);`
248			`}`
249			`}`
250			`return err;`
251			`}`
252
253			`static int ufs_rename (struct inode * old_dir, struct dentry * old_dentry,`
254			`struct inode * new_dir, struct dentry * new_dentry )`
255			`{`
256			`struct inode *old_inode = old_dentry->d_inode;`
257			`struct inode *new_inode = new_dentry->d_inode;`
258			`struct buffer_head *dir_bh = NULL;`
259			`struct ufs_dir_entry *dir_de = NULL;`
260			`struct buffer_head *old_bh;`
261			`struct ufs_dir_entry *old_de;`
262			`int err = -ENOENT;`
263
264			`old_de = ufs_find_entry (old_dentry, &old_bh);`
265			`if (!old_de)`
266			`goto out;`
267
268			`if (S_ISDIR(old_inode->i_mode)) {`
269			`err = -EIO;`
270			`dir_de = ufs_dotdot(old_inode, &dir_bh);`
271			`if (!dir_de)`
272			`goto out_old;`
273			`}`
274
275			`if (new_inode) {`
276			`struct buffer_head *new_bh;`
277			`struct ufs_dir_entry *new_de;`
278
279			`err = -ENOTEMPTY;`
280			`if (dir_de && !ufs_empty_dir (new_inode))`
281			`goto out_dir;`
282			`err = -ENOENT;`
283			`new_de = ufs_find_entry (new_dentry, &new_bh);`
284			`if (!new_de)`
285			`goto out_dir;`
286			`ufs_inc_count(old_inode);`
287			`ufs_set_link(new_dir, new_de, new_bh, old_inode);`
288			`new_inode->i_ctime = CURRENT_TIME;`
289			`if (dir_de)`
290			`new_inode->i_nlink--;`
291			`ufs_dec_count(new_inode);`
292			`} else {`
293			`if (dir_de) {`
294			`err = -EMLINK;`
295			`if (new_dir->i_nlink >= UFS_LINK_MAX)`
296			`goto out_dir;`
297			`}`
298			`ufs_inc_count(old_inode);`
299			`err = ufs_add_link(new_dentry, old_inode);`
300			`if (err) {`
301			`ufs_dec_count(old_inode);`
302			`goto out_dir;`
303			`}`
304			`if (dir_de)`
305			`ufs_inc_count(new_dir);`
306			`}`
307
308			`ufs_delete_entry (old_dir, old_de, old_bh);`
309
310			`ufs_dec_count(old_inode);`
311
312			`if (dir_de) {`
313			`ufs_set_link(old_inode, dir_de, dir_bh, new_dir);`
314			`ufs_dec_count(old_dir);`
315			`}`
316			`return 0;`
317
318			`out_dir:`
319			`if (dir_de)`
320			`brelse(dir_bh);`
321			`out_old:`
322			`brelse (old_bh);`
323			`out:`
324			`return err;`
325			`}`
326
327			`struct inode_operations ufs_dir_inode_operations = {`
328			`create: ufs_create,`
329			`lookup: ufs_lookup,`
330			`link: ufs_link,`
331			`unlink: ufs_unlink,`
332			`symlink: ufs_symlink,`
333			`mkdir: ufs_mkdir,`
334			`rmdir: ufs_rmdir,`
335			`mknod: ufs_mknod,`
336			`rename: ufs_rename,`
337			`};`