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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> | |
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 | ||
54 | #include "buffer_head_io.h" | |
55 | ||
56 | static char *ocfs2_page_getlink(struct dentry * dentry, | |
57 | struct page **ppage); | |
58 | static char *ocfs2_fast_symlink_getlink(struct inode *inode, | |
59 | struct buffer_head **bh); | |
60 | ||
61 | /* get the link contents into pagecache */ | |
62 | static char *ocfs2_page_getlink(struct dentry * dentry, | |
63 | struct page **ppage) | |
64 | { | |
65 | struct page * page; | |
66 | struct address_space *mapping = dentry->d_inode->i_mapping; | |
090d2b18 | 67 | page = read_mapping_page(mapping, 0, NULL); |
ccd979bd MF |
68 | if (IS_ERR(page)) |
69 | goto sync_fail; | |
70 | wait_on_page_locked(page); | |
71 | if (!PageUptodate(page)) | |
72 | goto async_fail; | |
73 | *ppage = page; | |
74 | return kmap(page); | |
75 | ||
76 | async_fail: | |
77 | page_cache_release(page); | |
78 | return ERR_PTR(-EIO); | |
79 | ||
80 | sync_fail: | |
81 | return (char*)page; | |
82 | } | |
83 | ||
84 | static char *ocfs2_fast_symlink_getlink(struct inode *inode, | |
85 | struct buffer_head **bh) | |
86 | { | |
87 | int status; | |
88 | char *link = NULL; | |
89 | struct ocfs2_dinode *fe; | |
90 | ||
91 | mlog_entry_void(); | |
92 | ||
93 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), | |
94 | OCFS2_I(inode)->ip_blkno, | |
95 | bh, | |
96 | OCFS2_BH_CACHED, | |
97 | inode); | |
98 | if (status < 0) { | |
99 | mlog_errno(status); | |
100 | link = ERR_PTR(status); | |
101 | goto bail; | |
102 | } | |
103 | ||
104 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
105 | link = (char *) fe->id2.i_symlink; | |
106 | bail: | |
107 | mlog_exit(status); | |
108 | ||
109 | return link; | |
110 | } | |
111 | ||
112 | static int ocfs2_readlink(struct dentry *dentry, | |
113 | char __user *buffer, | |
114 | int buflen) | |
115 | { | |
116 | int ret; | |
117 | char *link; | |
118 | struct buffer_head *bh = NULL; | |
119 | struct inode *inode = dentry->d_inode; | |
120 | ||
121 | mlog_entry_void(); | |
122 | ||
123 | link = ocfs2_fast_symlink_getlink(inode, &bh); | |
124 | if (IS_ERR(link)) { | |
125 | ret = PTR_ERR(link); | |
126 | goto out; | |
127 | } | |
128 | ||
25899dee TY |
129 | /* |
130 | * Without vfsmount we can't update atime now, | |
131 | * but we will update atime here ultimately. | |
132 | */ | |
ccd979bd MF |
133 | ret = vfs_readlink(dentry, buffer, buflen, link); |
134 | ||
135 | brelse(bh); | |
136 | out: | |
137 | mlog_exit(ret); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static void *ocfs2_follow_link(struct dentry *dentry, | |
142 | struct nameidata *nd) | |
143 | { | |
144 | int status; | |
145 | char *link; | |
146 | struct inode *inode = dentry->d_inode; | |
147 | struct page *page = NULL; | |
148 | struct buffer_head *bh = NULL; | |
149 | ||
150 | if (ocfs2_inode_is_fast_symlink(inode)) | |
151 | link = ocfs2_fast_symlink_getlink(inode, &bh); | |
152 | else | |
153 | link = ocfs2_page_getlink(dentry, &page); | |
154 | if (IS_ERR(link)) { | |
155 | status = PTR_ERR(link); | |
156 | mlog_errno(status); | |
157 | goto bail; | |
158 | } | |
159 | ||
160 | status = vfs_follow_link(nd, link); | |
72bce507 | 161 | |
ccd979bd MF |
162 | bail: |
163 | if (page) { | |
164 | kunmap(page); | |
165 | page_cache_release(page); | |
166 | } | |
167 | if (bh) | |
168 | brelse(bh); | |
169 | ||
170 | return ERR_PTR(status); | |
171 | } | |
172 | ||
173 | struct inode_operations ocfs2_symlink_inode_operations = { | |
174 | .readlink = page_readlink, | |
175 | .follow_link = ocfs2_follow_link, | |
176 | .getattr = ocfs2_getattr, | |
177 | }; | |
178 | struct inode_operations ocfs2_fast_symlink_inode_operations = { | |
179 | .readlink = ocfs2_readlink, | |
180 | .follow_link = ocfs2_follow_link, | |
181 | .getattr = ocfs2_getattr, | |
182 | }; |