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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_psdev.h> |
11 | #include "coda_linux.h" |
12 | |
13 | static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2) |
14 | { |
15 | return memcmp(fid1, fid2, sizeof(*fid1)) == 0; |
16 | } |
17 | |
18 | static const struct inode_operations coda_symlink_inode_operations = { |
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; |
47 | struct coda_inode_info *cii = ITOC(inode); |
48 | return coda_fideq(&cii->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 | struct coda_inode_info *cii = ITOC(inode); |
55 | cii->c_fid = *fid; |
56 | return 0; |
57 | } |
58 | |
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; |
75 | /* inode is locked and unique, no need to grab cii->c_lock */ |
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 | |
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. */ |
120 | void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, |
121 | struct CodaFid *newfid) |
122 | { |
123 | struct coda_inode_info *cii = ITOC(inode); |
124 | unsigned long hash = coda_f2i(newfid); |
125 | |
126 | BUG_ON(!coda_fideq(&cii->c_fid, oldfid)); |
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 | |
147 | inode = ilookup5(sb, hash, coda_test_inode, fid); |
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 | |
175 |
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