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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
Arjan van de Ven754661f2007-02-12 00:55:38 -080019static const struct inode_operations coda_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 .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
Eric Sesterhennc5d32372006-03-24 18:42:13 +0100123 BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125 /* replace fid and rehash inode */
126 /* XXX we probably need to hold some lock here! */
127 remove_inode_hash(inode);
128 cii->c_fid = *newfid;
129 inode->i_ino = hash;
130 __insert_inode_hash(inode, hash);
131}
132
133/* convert a fid to an inode. */
134struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb)
135{
136 struct inode *inode;
137 unsigned long hash = coda_f2i(fid);
138
139 if ( !sb ) {
140 printk("coda_fid_to_inode: no sb!\n");
141 return NULL;
142 }
143
144 inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
145 if ( !inode )
146 return NULL;
147
148 /* we should never see newly created inodes because we intentionally
149 * fail in the initialization callback */
150 BUG_ON(inode->i_state & I_NEW);
151
152 return inode;
153}
154
155/* the CONTROL inode is made without asking attributes from Venus */
156int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
157{
158 int error = -ENOMEM;
159
160 *inode = new_inode(sb);
161 if (*inode) {
162 (*inode)->i_ino = CTL_INO;
163 (*inode)->i_op = &coda_ioctl_inode_operations;
164 (*inode)->i_fop = &coda_ioctl_operations;
165 (*inode)->i_mode = 0444;
166 error = 0;
167 }
168
169 return error;
170}
171