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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * linux/cluster/ssi/cfs/symlink.c | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation; either version 2 of | |
9 | * the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE | |
14 | * or NON INFRINGEMENT. See the GNU General Public License for more | |
15 | * details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | * | |
21 | * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net | |
22 | * | |
23 | * Copyright (C) 1992 Rick Sladkey | |
24 | * | |
25 | * Optimization changes Copyright (C) 1994 Florian La Roche | |
26 | * | |
27 | * Jun 7 1999, cache symlink lookups in the page cache. -DaveM | |
28 | * | |
29 | * Portions Copyright (C) 2001 Compaq Computer Corporation | |
30 | * | |
31 | * ocfs2 symlink handling code. | |
32 | * | |
33 | * Copyright (C) 2004, 2005 Oracle. | |
34 | * | |
35 | */ | |
36 | ||
37 | #include <linux/fs.h> | |
38 | #include <linux/types.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/pagemap.h> | |
41 | #include <linux/utsname.h> | |
a731d12d | 42 | #include <linux/namei.h> |
ccd979bd MF |
43 | |
44 | #define MLOG_MASK_PREFIX ML_NAMEI | |
45 | #include <cluster/masklog.h> | |
46 | ||
47 | #include "ocfs2.h" | |
48 | ||
49 | #include "alloc.h" | |
50 | #include "file.h" | |
51 | #include "inode.h" | |
52 | #include "journal.h" | |
53 | #include "symlink.h" | |
cf1d6c76 | 54 | #include "xattr.h" |
ccd979bd MF |
55 | |
56 | #include "buffer_head_io.h" | |
57 | ||
ccd979bd MF |
58 | |
59 | static char *ocfs2_fast_symlink_getlink(struct inode *inode, | |
60 | struct buffer_head **bh) | |
61 | { | |
62 | int status; | |
63 | char *link = NULL; | |
64 | struct ocfs2_dinode *fe; | |
65 | ||
66 | mlog_entry_void(); | |
67 | ||
b657c95c | 68 | status = ocfs2_read_inode_block(inode, bh); |
ccd979bd MF |
69 | if (status < 0) { |
70 | mlog_errno(status); | |
71 | link = ERR_PTR(status); | |
72 | goto bail; | |
73 | } | |
74 | ||
75 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
76 | link = (char *) fe->id2.i_symlink; | |
77 | bail: | |
78 | mlog_exit(status); | |
79 | ||
80 | return link; | |
81 | } | |
82 | ||
83 | static int ocfs2_readlink(struct dentry *dentry, | |
84 | char __user *buffer, | |
85 | int buflen) | |
86 | { | |
87 | int ret; | |
88 | char *link; | |
89 | struct buffer_head *bh = NULL; | |
90 | struct inode *inode = dentry->d_inode; | |
91 | ||
92 | mlog_entry_void(); | |
93 | ||
94 | link = ocfs2_fast_symlink_getlink(inode, &bh); | |
95 | if (IS_ERR(link)) { | |
96 | ret = PTR_ERR(link); | |
97 | goto out; | |
98 | } | |
99 | ||
25899dee TY |
100 | /* |
101 | * Without vfsmount we can't update atime now, | |
102 | * but we will update atime here ultimately. | |
103 | */ | |
ccd979bd MF |
104 | ret = vfs_readlink(dentry, buffer, buflen, link); |
105 | ||
106 | brelse(bh); | |
107 | out: | |
108 | mlog_exit(ret); | |
109 | return ret; | |
110 | } | |
111 | ||
a731d12d JB |
112 | static void *ocfs2_fast_follow_link(struct dentry *dentry, |
113 | struct nameidata *nd) | |
ccd979bd | 114 | { |
a731d12d JB |
115 | int status = 0; |
116 | int len; | |
117 | char *target, *link = ERR_PTR(-ENOMEM); | |
ccd979bd | 118 | struct inode *inode = dentry->d_inode; |
ccd979bd | 119 | struct buffer_head *bh = NULL; |
a731d12d JB |
120 | |
121 | mlog_entry_void(); | |
122 | ||
123 | BUG_ON(!ocfs2_inode_is_fast_symlink(inode)); | |
124 | target = ocfs2_fast_symlink_getlink(inode, &bh); | |
125 | if (IS_ERR(target)) { | |
126 | status = PTR_ERR(target); | |
ccd979bd MF |
127 | mlog_errno(status); |
128 | goto bail; | |
129 | } | |
130 | ||
a731d12d JB |
131 | /* Fast symlinks can't be large */ |
132 | len = strlen(target); | |
133 | link = kzalloc(len + 1, GFP_NOFS); | |
134 | if (!link) { | |
135 | status = -ENOMEM; | |
136 | mlog_errno(status); | |
137 | goto bail; | |
138 | } | |
139 | ||
140 | memcpy(link, target, len); | |
141 | nd_set_link(nd, link); | |
72bce507 | 142 | |
ccd979bd | 143 | bail: |
a81cb88b | 144 | brelse(bh); |
ccd979bd | 145 | |
a731d12d JB |
146 | mlog_exit(status); |
147 | return status ? ERR_PTR(status) : link; | |
148 | } | |
149 | ||
150 | static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) | |
151 | { | |
152 | char *link = cookie; | |
153 | ||
154 | kfree(link); | |
ccd979bd MF |
155 | } |
156 | ||
92e1d5be | 157 | const struct inode_operations ocfs2_symlink_inode_operations = { |
ccd979bd | 158 | .readlink = page_readlink, |
a731d12d JB |
159 | .follow_link = page_follow_link_light, |
160 | .put_link = page_put_link, | |
ccd979bd | 161 | .getattr = ocfs2_getattr, |
bc535809 | 162 | .setattr = ocfs2_setattr, |
cf1d6c76 TY |
163 | .setxattr = generic_setxattr, |
164 | .getxattr = generic_getxattr, | |
165 | .listxattr = ocfs2_listxattr, | |
166 | .removexattr = generic_removexattr, | |
ccd979bd | 167 | }; |
92e1d5be | 168 | const struct inode_operations ocfs2_fast_symlink_inode_operations = { |
ccd979bd | 169 | .readlink = ocfs2_readlink, |
a731d12d JB |
170 | .follow_link = ocfs2_fast_follow_link, |
171 | .put_link = ocfs2_fast_put_link, | |
ccd979bd | 172 | .getattr = ocfs2_getattr, |
bc535809 | 173 | .setattr = ocfs2_setattr, |
cf1d6c76 TY |
174 | .setxattr = generic_setxattr, |
175 | .getxattr = generic_getxattr, | |
176 | .listxattr = ocfs2_listxattr, | |
177 | .removexattr = generic_removexattr, | |
ccd979bd | 178 | }; |