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
14 static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
15 {
16 return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
17 }
18
19 static 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 */
27 static 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
45 static 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
51 static 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
58 struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
59 struct coda_vattr * attr)
60 {
61 struct inode *inode;
62 struct coda_inode_info *cii;
63 unsigned long hash = coda_f2i(fid);
64
65 inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
66
67 if (!inode)
68 return ERR_PTR(-ENOMEM);
69
70 if (inode->i_state & I_NEW) {
71 cii = ITOC(inode);
72 /* we still need to set i_ino for things like stat(2) */
73 inode->i_ino = hash;
74 cii->c_mapcount = 0;
75 unlock_new_inode(inode);
76 }
77
78 /* always replace the attributes, type might have changed */
79 coda_fill_inode(inode, attr);
80 return inode;
81 }
82
83 /* this is effectively coda_iget:
84 - get attributes (might be cached)
85 - get the inode for the fid using vfs iget
86 - link the two up if this is needed
87 - fill in the attributes
88 */
89 int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb)
90 {
91 struct coda_vattr attr;
92 int error;
93
94 /* We get inode numbers from Venus -- see venus source */
95 error = venus_getattr(sb, fid, &attr);
96 if ( error ) {
97 *inode = NULL;
98 return error;
99 }
100
101 *inode = coda_iget(sb, fid, &attr);
102 if ( IS_ERR(*inode) ) {
103 printk("coda_cnode_make: coda_iget failed\n");
104 return PTR_ERR(*inode);
105 }
106 return 0;
107 }
108
109
110 void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid,
111 struct CodaFid *newfid)
112 {
113 struct coda_inode_info *cii;
114 unsigned long hash = coda_f2i(newfid);
115
116 cii = ITOC(inode);
117
118 BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
119
120 /* replace fid and rehash inode */
121 /* XXX we probably need to hold some lock here! */
122 remove_inode_hash(inode);
123 cii->c_fid = *newfid;
124 inode->i_ino = hash;
125 __insert_inode_hash(inode, hash);
126 }
127
128 /* convert a fid to an inode. */
129 struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb)
130 {
131 struct inode *inode;
132 unsigned long hash = coda_f2i(fid);
133
134 if ( !sb ) {
135 printk("coda_fid_to_inode: no sb!\n");
136 return NULL;
137 }
138
139 inode = ilookup5(sb, hash, coda_test_inode, fid);
140 if ( !inode )
141 return NULL;
142
143 /* we should never see newly created inodes because we intentionally
144 * fail in the initialization callback */
145 BUG_ON(inode->i_state & I_NEW);
146
147 return inode;
148 }
149
150 /* the CONTROL inode is made without asking attributes from Venus */
151 int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
152 {
153 int error = -ENOMEM;
154
155 *inode = new_inode(sb);
156 if (*inode) {
157 (*inode)->i_ino = CTL_INO;
158 (*inode)->i_op = &coda_ioctl_inode_operations;
159 (*inode)->i_fop = &coda_ioctl_operations;
160 (*inode)->i_mode = 0444;
161 error = 0;
162 }
163
164 return error;
165 }
166
167
|
This page was automatically generated by the
LXR engine.
|