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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/namei.h> |
42 | |
43 | #define MLOG_MASK_PREFIX ML_NAMEI |
44 | #include <cluster/masklog.h> |
45 | |
46 | #include "ocfs2.h" |
47 | |
48 | #include "alloc.h" |
49 | #include "file.h" |
50 | #include "inode.h" |
51 | #include "journal.h" |
52 | #include "symlink.h" |
53 | #include "xattr.h" |
54 | |
55 | #include "buffer_head_io.h" |
56 | |
57 | |
58 | static char *ocfs2_fast_symlink_getlink(struct inode *inode, |
59 | struct buffer_head **bh) |
60 | { |
61 | int status; |
62 | char *link = NULL; |
63 | struct ocfs2_dinode *fe; |
64 | |
65 | mlog_entry_void(); |
66 | |
67 | status = ocfs2_read_inode_block(inode, bh); |
68 | if (status < 0) { |
69 | mlog_errno(status); |
70 | link = ERR_PTR(status); |
71 | goto bail; |
72 | } |
73 | |
74 | fe = (struct ocfs2_dinode *) (*bh)->b_data; |
75 | link = (char *) fe->id2.i_symlink; |
76 | bail: |
77 | mlog_exit(status); |
78 | |
79 | return link; |
80 | } |
81 | |
82 | static int ocfs2_readlink(struct dentry *dentry, |
83 | char __user *buffer, |
84 | int buflen) |
85 | { |
86 | int ret; |
87 | char *link; |
88 | struct buffer_head *bh = NULL; |
89 | struct inode *inode = dentry->d_inode; |
90 | |
91 | mlog_entry_void(); |
92 | |
93 | link = ocfs2_fast_symlink_getlink(inode, &bh); |
94 | if (IS_ERR(link)) { |
95 | ret = PTR_ERR(link); |
96 | goto out; |
97 | } |
98 | |
99 | /* |
100 | * Without vfsmount we can't update atime now, |
101 | * but we will update atime here ultimately. |
102 | */ |
103 | ret = vfs_readlink(dentry, buffer, buflen, link); |
104 | |
105 | brelse(bh); |
106 | out: |
107 | mlog_exit(ret); |
108 | return ret; |
109 | } |
110 | |
111 | static void *ocfs2_fast_follow_link(struct dentry *dentry, |
112 | struct nameidata *nd) |
113 | { |
114 | int status = 0; |
115 | int len; |
116 | char *target, *link = ERR_PTR(-ENOMEM); |
117 | struct inode *inode = dentry->d_inode; |
118 | struct buffer_head *bh = NULL; |
119 | |
120 | mlog_entry_void(); |
121 | |
122 | BUG_ON(!ocfs2_inode_is_fast_symlink(inode)); |
123 | target = ocfs2_fast_symlink_getlink(inode, &bh); |
124 | if (IS_ERR(target)) { |
125 | status = PTR_ERR(target); |
126 | mlog_errno(status); |
127 | goto bail; |
128 | } |
129 | |
130 | /* Fast symlinks can't be large */ |
131 | len = strlen(target); |
132 | link = kzalloc(len + 1, GFP_NOFS); |
133 | if (!link) { |
134 | status = -ENOMEM; |
135 | mlog_errno(status); |
136 | goto bail; |
137 | } |
138 | |
139 | memcpy(link, target, len); |
140 | |
141 | bail: |
142 | nd_set_link(nd, status ? ERR_PTR(status) : link); |
143 | brelse(bh); |
144 | |
145 | mlog_exit(status); |
146 | return NULL; |
147 | } |
148 | |
149 | static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) |
150 | { |
151 | char *link = nd_get_link(nd); |
152 | if (!IS_ERR(link)) |
153 | kfree(link); |
154 | } |
155 | |
156 | const struct inode_operations ocfs2_symlink_inode_operations = { |
157 | .readlink = page_readlink, |
158 | .follow_link = page_follow_link_light, |
159 | .put_link = page_put_link, |
160 | .getattr = ocfs2_getattr, |
161 | .setattr = ocfs2_setattr, |
162 | .setxattr = generic_setxattr, |
163 | .getxattr = generic_getxattr, |
164 | .listxattr = ocfs2_listxattr, |
165 | .removexattr = generic_removexattr, |
166 | .fiemap = ocfs2_fiemap, |
167 | }; |
168 | const struct inode_operations ocfs2_fast_symlink_inode_operations = { |
169 | .readlink = ocfs2_readlink, |
170 | .follow_link = ocfs2_fast_follow_link, |
171 | .put_link = ocfs2_fast_put_link, |
172 | .getattr = ocfs2_getattr, |
173 | .setattr = ocfs2_setattr, |
174 | .setxattr = generic_setxattr, |
175 | .getxattr = generic_getxattr, |
176 | .listxattr = ocfs2_listxattr, |
177 | .removexattr = generic_removexattr, |
178 | .fiemap = ocfs2_fiemap, |
179 | }; |
180 |
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