Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* cnode related routines for the coda kernel code |
3 | (C) 1996 Peter Braam | |
4 | */ | |
5 | ||
6 | #include <linux/types.h> | |
7 | #include <linux/string.h> | |
8 | #include <linux/time.h> | |
9 | ||
10 | #include <linux/coda.h> | |
21fc61c7 | 11 | #include <linux/pagemap.h> |
8fc8b9df | 12 | #include "coda_psdev.h" |
31a203df | 13 | #include "coda_linux.h" |
1da177e4 LT |
14 | |
15 | static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2) | |
16 | { | |
17 | return memcmp(fid1, fid2, sizeof(*fid1)) == 0; | |
18 | } | |
19 | ||
754661f1 | 20 | static const struct inode_operations coda_symlink_inode_operations = { |
6b255391 | 21 | .get_link = page_get_link, |
1da177e4 LT |
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; | |
21fc61c7 | 38 | inode_nohighmem(inode); |
1da177e4 LT |
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; | |
b5ce1d83 YA |
48 | struct coda_inode_info *cii = ITOC(inode); |
49 | return coda_fideq(&cii->c_fid, fid); | |
1da177e4 LT |
50 | } |
51 | ||
52 | static int coda_set_inode(struct inode *inode, void *data) | |
53 | { | |
54 | struct CodaFid *fid = (struct CodaFid *)data; | |
b5ce1d83 YA |
55 | struct coda_inode_info *cii = ITOC(inode); |
56 | cii->c_fid = *fid; | |
1da177e4 LT |
57 | return 0; |
58 | } | |
59 | ||
1da177e4 LT |
60 | struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid, |
61 | struct coda_vattr * attr) | |
62 | { | |
63 | struct inode *inode; | |
64 | struct coda_inode_info *cii; | |
65 | unsigned long hash = coda_f2i(fid); | |
5a646fb3 | 66 | umode_t inode_type = coda_inode_type(attr); |
1da177e4 | 67 | |
5a646fb3 | 68 | retry: |
1da177e4 | 69 | inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid); |
1da177e4 LT |
70 | if (!inode) |
71 | return ERR_PTR(-ENOMEM); | |
72 | ||
73 | if (inode->i_state & I_NEW) { | |
74 | cii = ITOC(inode); | |
75 | /* we still need to set i_ino for things like stat(2) */ | |
76 | inode->i_ino = hash; | |
b5ce1d83 | 77 | /* inode is locked and unique, no need to grab cii->c_lock */ |
1da177e4 | 78 | cii->c_mapcount = 0; |
5a646fb3 | 79 | coda_fill_inode(inode, attr); |
1da177e4 | 80 | unlock_new_inode(inode); |
5a646fb3 JH |
81 | } else if ((inode->i_mode & S_IFMT) != inode_type) { |
82 | /* Inode has changed type, mark bad and grab a new one */ | |
83 | remove_inode_hash(inode); | |
84 | coda_flag_inode(inode, C_PURGE); | |
85 | iput(inode); | |
86 | goto retry; | |
1da177e4 | 87 | } |
1da177e4 LT |
88 | return inode; |
89 | } | |
90 | ||
91 | /* this is effectively coda_iget: | |
92 | - get attributes (might be cached) | |
93 | - get the inode for the fid using vfs iget | |
94 | - link the two up if this is needed | |
95 | - fill in the attributes | |
96 | */ | |
f4947fbc | 97 | struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb) |
1da177e4 LT |
98 | { |
99 | struct coda_vattr attr; | |
f4947fbc | 100 | struct inode *inode; |
1da177e4 LT |
101 | int error; |
102 | ||
103 | /* We get inode numbers from Venus -- see venus source */ | |
104 | error = venus_getattr(sb, fid, &attr); | |
f4947fbc AV |
105 | if (error) |
106 | return ERR_PTR(error); | |
1da177e4 | 107 | |
f4947fbc AV |
108 | inode = coda_iget(sb, fid, &attr); |
109 | if (IS_ERR(inode)) | |
6d6bd94f | 110 | pr_warn("%s: coda_iget failed\n", __func__); |
f4947fbc | 111 | return inode; |
1da177e4 LT |
112 | } |
113 | ||
114 | ||
b5ce1d83 YA |
115 | /* Although we treat Coda file identifiers as immutable, there is one |
116 | * special case for files created during a disconnection where they may | |
117 | * not be globally unique. When an identifier collision is detected we | |
118 | * first try to flush the cached inode from the kernel and finally | |
119 | * resort to renaming/rehashing in-place. Userspace remembers both old | |
120 | * and new values of the identifier to handle any in-flight upcalls. | |
121 | * The real solution is to use globally unique UUIDs as identifiers, but | |
122 | * retrofitting the existing userspace code for this is non-trivial. */ | |
1da177e4 LT |
123 | void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, |
124 | struct CodaFid *newfid) | |
125 | { | |
b5ce1d83 | 126 | struct coda_inode_info *cii = ITOC(inode); |
1da177e4 LT |
127 | unsigned long hash = coda_f2i(newfid); |
128 | ||
c5d3237c | 129 | BUG_ON(!coda_fideq(&cii->c_fid, oldfid)); |
1da177e4 LT |
130 | |
131 | /* replace fid and rehash inode */ | |
132 | /* XXX we probably need to hold some lock here! */ | |
133 | remove_inode_hash(inode); | |
134 | cii->c_fid = *newfid; | |
135 | inode->i_ino = hash; | |
136 | __insert_inode_hash(inode, hash); | |
137 | } | |
138 | ||
139 | /* convert a fid to an inode. */ | |
140 | struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) | |
141 | { | |
142 | struct inode *inode; | |
143 | unsigned long hash = coda_f2i(fid); | |
144 | ||
ed31a7dd | 145 | inode = ilookup5(sb, hash, coda_test_inode, fid); |
1da177e4 LT |
146 | if ( !inode ) |
147 | return NULL; | |
148 | ||
149 | /* we should never see newly created inodes because we intentionally | |
150 | * fail in the initialization callback */ | |
151 | BUG_ON(inode->i_state & I_NEW); | |
152 | ||
153 | return inode; | |
154 | } | |
155 | ||
5bb44810 FF |
156 | struct coda_file_info *coda_ftoc(struct file *file) |
157 | { | |
158 | struct coda_file_info *cfi = file->private_data; | |
159 | ||
160 | BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); | |
161 | ||
162 | return cfi; | |
163 | ||
164 | } | |
165 | ||
1da177e4 | 166 | /* the CONTROL inode is made without asking attributes from Venus */ |
0b2c4e39 | 167 | struct inode *coda_cnode_makectl(struct super_block *sb) |
1da177e4 | 168 | { |
0b2c4e39 AV |
169 | struct inode *inode = new_inode(sb); |
170 | if (inode) { | |
171 | inode->i_ino = CTL_INO; | |
172 | inode->i_op = &coda_ioctl_inode_operations; | |
173 | inode->i_fop = &coda_ioctl_operations; | |
174 | inode->i_mode = 0444; | |
175 | return inode; | |
1da177e4 | 176 | } |
0b2c4e39 | 177 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
178 | } |
179 |