ocfs2: Pass raw u64 to filldir
[linux-2.6] / fs / ocfs2 / symlink.c
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;
67         page = read_mapping_page(mapping, 0, NULL);
68         if (IS_ERR(page))
69                 goto sync_fail;
70         *ppage = page;
71         return kmap(page);
72
73 sync_fail:
74         return (char*)page;
75 }
76
77 static char *ocfs2_fast_symlink_getlink(struct inode *inode,
78                                         struct buffer_head **bh)
79 {
80         int status;
81         char *link = NULL;
82         struct ocfs2_dinode *fe;
83
84         mlog_entry_void();
85
86         status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
87                                   OCFS2_I(inode)->ip_blkno,
88                                   bh,
89                                   OCFS2_BH_CACHED,
90                                   inode);
91         if (status < 0) {
92                 mlog_errno(status);
93                 link = ERR_PTR(status);
94                 goto bail;
95         }
96
97         fe = (struct ocfs2_dinode *) (*bh)->b_data;
98         link = (char *) fe->id2.i_symlink;
99 bail:
100         mlog_exit(status);
101
102         return link;
103 }
104
105 static int ocfs2_readlink(struct dentry *dentry,
106                           char __user *buffer,
107                           int buflen)
108 {
109         int ret;
110         char *link;
111         struct buffer_head *bh = NULL;
112         struct inode *inode = dentry->d_inode;
113
114         mlog_entry_void();
115
116         link = ocfs2_fast_symlink_getlink(inode, &bh);
117         if (IS_ERR(link)) {
118                 ret = PTR_ERR(link);
119                 goto out;
120         }
121
122         /*
123          * Without vfsmount we can't update atime now,
124          * but we will update atime here ultimately.
125          */
126         ret = vfs_readlink(dentry, buffer, buflen, link);
127
128         brelse(bh);
129 out:
130         mlog_exit(ret);
131         return ret;
132 }
133
134 static void *ocfs2_follow_link(struct dentry *dentry,
135                                struct nameidata *nd)
136 {
137         int status;
138         char *link;
139         struct inode *inode = dentry->d_inode;
140         struct page *page = NULL;
141         struct buffer_head *bh = NULL;
142         
143         if (ocfs2_inode_is_fast_symlink(inode))
144                 link = ocfs2_fast_symlink_getlink(inode, &bh);
145         else
146                 link = ocfs2_page_getlink(dentry, &page);
147         if (IS_ERR(link)) {
148                 status = PTR_ERR(link);
149                 mlog_errno(status);
150                 goto bail;
151         }
152
153         status = vfs_follow_link(nd, link);
154
155 bail:
156         if (page) {
157                 kunmap(page);
158                 page_cache_release(page);
159         }
160         if (bh)
161                 brelse(bh);
162
163         return ERR_PTR(status);
164 }
165
166 const struct inode_operations ocfs2_symlink_inode_operations = {
167         .readlink       = page_readlink,
168         .follow_link    = ocfs2_follow_link,
169         .getattr        = ocfs2_getattr,
170 };
171 const struct inode_operations ocfs2_fast_symlink_inode_operations = {
172         .readlink       = ocfs2_readlink,
173         .follow_link    = ocfs2_follow_link,
174         .getattr        = ocfs2_getattr,
175 };