1/* cnode related routines for the coda kernel code
2   (C) 1996 Peter Braam
3   */
4
5#include <linux/types.h>
6#include <linux/string.h>
7#include <linux/time.h>
8
9#include <linux/coda.h>
10#include <linux/coda_linux.h>
11#include <linux/coda_fs_i.h>
12#include <linux/coda_psdev.h>
13
14static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
15{
16	return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
17}
18
19static const struct inode_operations coda_symlink_inode_operations = {
20	.readlink	= generic_readlink,
21	.follow_link	= page_follow_link_light,
22	.put_link	= page_put_link,
23	.setattr	= coda_setattr,
24};
25
26/* cnode.c */
27static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
28{
29        coda_vattr_to_iattr(inode, attr);
30
31        if (S_ISREG(inode->i_mode)) {
32                inode->i_op = &coda_file_inode_operations;
33                inode->i_fop = &coda_file_operations;
34        } else if (S_ISDIR(inode->i_mode)) {
35                inode->i_op = &coda_dir_inode_operations;
36                inode->i_fop = &coda_dir_operations;
37        } else if (S_ISLNK(inode->i_mode)) {
38		inode->i_op = &coda_symlink_inode_operations;
39		inode->i_data.a_ops = &coda_symlink_aops;
40		inode->i_mapping = &inode->i_data;
41	} else
42                init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));
43}
44
45static int coda_test_inode(struct inode *inode, void *data)
46{
47	struct CodaFid *fid = (struct CodaFid *)data;
48	return coda_fideq(&(ITOC(inode)->c_fid), fid);
49}
50
51static int coda_set_inode(struct inode *inode, void *data)
52{
53	struct CodaFid *fid = (struct CodaFid *)data;
54	ITOC(inode)->c_fid = *fid;
55	return 0;
56}
57
58static int coda_fail_inode(struct inode *inode, void *data)
59{
60	return -1;
61}
62
63struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
64			 struct coda_vattr * attr)
65{
66	struct inode *inode;
67	struct coda_inode_info *cii;
68	unsigned long hash = coda_f2i(fid);
69
70	inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
71
72	if (!inode)
73		return ERR_PTR(-ENOMEM);
74
75	if (inode->i_state & I_NEW) {
76		cii = ITOC(inode);
77		/* we still need to set i_ino for things like stat(2) */
78		inode->i_ino = hash;
79		cii->c_mapcount = 0;
80		unlock_new_inode(inode);
81	}
82
83	/* always replace the attributes, type might have changed */
84	coda_fill_inode(inode, attr);
85	return inode;
86}
87
88/* this is effectively coda_iget:
89   - get attributes (might be cached)
90   - get the inode for the fid using vfs iget
91   - link the two up if this is needed
92   - fill in the attributes
93*/
94int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb)
95{
96        struct coda_vattr attr;
97        int error;
98
99	/* We get inode numbers from Venus -- see venus source */
100	error = venus_getattr(sb, fid, &attr);
101	if ( error ) {
102	    *inode = NULL;
103	    return error;
104	}
105
106	*inode = coda_iget(sb, fid, &attr);
107	if ( IS_ERR(*inode) ) {
108		printk("coda_cnode_make: coda_iget failed\n");
109                return PTR_ERR(*inode);
110        }
111	return 0;
112}
113
114
115void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid,
116		      struct CodaFid *newfid)
117{
118	struct coda_inode_info *cii;
119	unsigned long hash = coda_f2i(newfid);
120
121	cii = ITOC(inode);
122
123	BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
124
125	/* replace fid and rehash inode */
126	remove_inode_hash(inode);
127	cii->c_fid = *newfid;
128	inode->i_ino = hash;
129	__insert_inode_hash(inode, hash);
130}
131
132/* convert a fid to an inode. */
133struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb)
134{
135	struct inode *inode;
136	unsigned long hash = coda_f2i(fid);
137
138	if ( !sb ) {
139		printk("coda_fid_to_inode: no sb!\n");
140		return NULL;
141	}
142
143	inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
144	if ( !inode )
145		return NULL;
146
147	/* we should never see newly created inodes because we intentionally
148	 * fail in the initialization callback */
149	BUG_ON(inode->i_state & I_NEW);
150
151	return inode;
152}
153
154/* the CONTROL inode is made without asking attributes from Venus */
155int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
156{
157	int error = -ENOMEM;
158
159	*inode = new_inode(sb);
160	if (*inode) {
161		(*inode)->i_ino = CTL_INO;
162		(*inode)->i_op = &coda_ioctl_inode_operations;
163		(*inode)->i_fop = &coda_ioctl_operations;
164		(*inode)->i_mode = 0444;
165		error = 0;
166	}
167
168	return error;
169}
170