Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1da177e4 | 10 | #include <linux/coda_psdev.h> |
31a203df | 11 | #include "coda_linux.h" |
1da177e4 LT |
12 | |
13 | static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2) | |
14 | { | |
15 | return memcmp(fid1, fid2, sizeof(*fid1)) == 0; | |
16 | } | |
17 | ||
754661f1 | 18 | static const struct inode_operations coda_symlink_inode_operations = { |
1da177e4 LT |
19 | .readlink = generic_readlink, |
20 | .follow_link = page_follow_link_light, | |
21 | .put_link = page_put_link, | |
22 | .setattr = coda_setattr, | |
23 | }; | |
24 | ||
25 | /* cnode.c */ | |
26 | static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr) | |
27 | { | |
28 | coda_vattr_to_iattr(inode, attr); | |
29 | ||
30 | if (S_ISREG(inode->i_mode)) { | |
31 | inode->i_op = &coda_file_inode_operations; | |
32 | inode->i_fop = &coda_file_operations; | |
33 | } else if (S_ISDIR(inode->i_mode)) { | |
34 | inode->i_op = &coda_dir_inode_operations; | |
35 | inode->i_fop = &coda_dir_operations; | |
36 | } else if (S_ISLNK(inode->i_mode)) { | |
37 | inode->i_op = &coda_symlink_inode_operations; | |
38 | inode->i_data.a_ops = &coda_symlink_aops; | |
39 | inode->i_mapping = &inode->i_data; | |
40 | } else | |
41 | init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev)); | |
42 | } | |
43 | ||
44 | static int coda_test_inode(struct inode *inode, void *data) | |
45 | { | |
46 | struct CodaFid *fid = (struct CodaFid *)data; | |
b5ce1d83 YA |
47 | struct coda_inode_info *cii = ITOC(inode); |
48 | return coda_fideq(&cii->c_fid, fid); | |
1da177e4 LT |
49 | } |
50 | ||
51 | static int coda_set_inode(struct inode *inode, void *data) | |
52 | { | |
53 | struct CodaFid *fid = (struct CodaFid *)data; | |
b5ce1d83 YA |
54 | struct coda_inode_info *cii = ITOC(inode); |
55 | cii->c_fid = *fid; | |
1da177e4 LT |
56 | return 0; |
57 | } | |
58 | ||
1da177e4 LT |
59 | struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid, |
60 | struct coda_vattr * attr) | |
61 | { | |
62 | struct inode *inode; | |
63 | struct coda_inode_info *cii; | |
64 | unsigned long hash = coda_f2i(fid); | |
65 | ||
66 | inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid); | |
67 | ||
68 | if (!inode) | |
69 | return ERR_PTR(-ENOMEM); | |
70 | ||
71 | if (inode->i_state & I_NEW) { | |
72 | cii = ITOC(inode); | |
73 | /* we still need to set i_ino for things like stat(2) */ | |
74 | inode->i_ino = hash; | |
b5ce1d83 | 75 | /* inode is locked and unique, no need to grab cii->c_lock */ |
1da177e4 LT |
76 | cii->c_mapcount = 0; |
77 | unlock_new_inode(inode); | |
78 | } | |
79 | ||
80 | /* always replace the attributes, type might have changed */ | |
81 | coda_fill_inode(inode, attr); | |
82 | return inode; | |
83 | } | |
84 | ||
85 | /* this is effectively coda_iget: | |
86 | - get attributes (might be cached) | |
87 | - get the inode for the fid using vfs iget | |
88 | - link the two up if this is needed | |
89 | - fill in the attributes | |
90 | */ | |
91 | int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb) | |
92 | { | |
93 | struct coda_vattr attr; | |
94 | int error; | |
95 | ||
96 | /* We get inode numbers from Venus -- see venus source */ | |
97 | error = venus_getattr(sb, fid, &attr); | |
98 | if ( error ) { | |
99 | *inode = NULL; | |
100 | return error; | |
101 | } | |
102 | ||
103 | *inode = coda_iget(sb, fid, &attr); | |
104 | if ( IS_ERR(*inode) ) { | |
105 | printk("coda_cnode_make: coda_iget failed\n"); | |
106 | return PTR_ERR(*inode); | |
107 | } | |
108 | return 0; | |
109 | } | |
110 | ||
111 | ||
b5ce1d83 YA |
112 | /* Although we treat Coda file identifiers as immutable, there is one |
113 | * special case for files created during a disconnection where they may | |
114 | * not be globally unique. When an identifier collision is detected we | |
115 | * first try to flush the cached inode from the kernel and finally | |
116 | * resort to renaming/rehashing in-place. Userspace remembers both old | |
117 | * and new values of the identifier to handle any in-flight upcalls. | |
118 | * The real solution is to use globally unique UUIDs as identifiers, but | |
119 | * retrofitting the existing userspace code for this is non-trivial. */ | |
1da177e4 LT |
120 | void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, |
121 | struct CodaFid *newfid) | |
122 | { | |
b5ce1d83 | 123 | struct coda_inode_info *cii = ITOC(inode); |
1da177e4 LT |
124 | unsigned long hash = coda_f2i(newfid); |
125 | ||
c5d3237c | 126 | BUG_ON(!coda_fideq(&cii->c_fid, oldfid)); |
1da177e4 LT |
127 | |
128 | /* replace fid and rehash inode */ | |
129 | /* XXX we probably need to hold some lock here! */ | |
130 | remove_inode_hash(inode); | |
131 | cii->c_fid = *newfid; | |
132 | inode->i_ino = hash; | |
133 | __insert_inode_hash(inode, hash); | |
134 | } | |
135 | ||
136 | /* convert a fid to an inode. */ | |
137 | struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) | |
138 | { | |
139 | struct inode *inode; | |
140 | unsigned long hash = coda_f2i(fid); | |
141 | ||
142 | if ( !sb ) { | |
143 | printk("coda_fid_to_inode: no sb!\n"); | |
144 | return NULL; | |
145 | } | |
146 | ||
ed31a7dd | 147 | inode = ilookup5(sb, hash, coda_test_inode, fid); |
1da177e4 LT |
148 | if ( !inode ) |
149 | return NULL; | |
150 | ||
151 | /* we should never see newly created inodes because we intentionally | |
152 | * fail in the initialization callback */ | |
153 | BUG_ON(inode->i_state & I_NEW); | |
154 | ||
155 | return inode; | |
156 | } | |
157 | ||
158 | /* the CONTROL inode is made without asking attributes from Venus */ | |
159 | int coda_cnode_makectl(struct inode **inode, struct super_block *sb) | |
160 | { | |
161 | int error = -ENOMEM; | |
162 | ||
163 | *inode = new_inode(sb); | |
164 | if (*inode) { | |
165 | (*inode)->i_ino = CTL_INO; | |
166 | (*inode)->i_op = &coda_ioctl_inode_operations; | |
167 | (*inode)->i_fop = &coda_ioctl_operations; | |
168 | (*inode)->i_mode = 0444; | |
169 | error = 0; | |
170 | } | |
171 | ||
172 | return error; | |
173 | } | |
174 |