1 /*
2 * linux/cluster/ssi/cfs/symlink.c
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
12 * or NON INFRINGEMENT. See the GNU General Public License for more
13 * details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 *
19 * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
20 *
21 * Copyright (C) 1992 Rick Sladkey
22 *
23 * Optimization changes Copyright (C) 1994 Florian La Roche
24 *
25 * Jun 7 1999, cache symlink lookups in the page cache. -DaveM
26 *
27 * Portions Copyright (C) 2001 Compaq Computer Corporation
28 *
29 * ocfs2 symlink handling code.
30 *
31 * Copyright (C) 2004, 2005 Oracle.
32 *
33 */
34
35 #include <linux/fs.h>
36 #include <linux/types.h>
37 #include <linux/slab.h>
38 #include <linux/pagemap.h>
39 #include <linux/namei.h>
40
41 #include <cluster/masklog.h>
42
43 #include "ocfs2.h"
44
45 #include "alloc.h"
46 #include "file.h"
47 #include "inode.h"
48 #include "journal.h"
49 #include "symlink.h"
50 #include "xattr.h"
51
52 #include "buffer_head_io.h"
53
54
55 static int ocfs2_fast_symlink_read_folio(struct file *f, struct folio *folio)
56 {
57 struct page *page = &folio->page;
58 struct inode *inode = page->mapping->host;
59 struct buffer_head *bh = NULL;
60 int status = ocfs2_read_inode_block(inode, &bh);
61 struct ocfs2_dinode *fe;
62 const char *link;
63 void *kaddr;
64 size_t len;
65
66 if (status < 0) {
67 mlog_errno(status);
68 return status;
69 }
70
71 fe = (struct ocfs2_dinode *) bh->b_data;
72 link = (char *) fe->id2.i_symlink;
73 /* will be less than a page size */
74 len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
75 kaddr = kmap_atomic(page);
76 memcpy(kaddr, link, len + 1);
77 kunmap_atomic(kaddr);
78 SetPageUptodate(page);
79 unlock_page(page);
80 brelse(bh);
81 return 0;
82 }
83
84 const struct address_space_operations ocfs2_fast_symlink_aops = {
85 .read_folio = ocfs2_fast_symlink_read_folio,
86 };
87
88 const struct inode_operations ocfs2_symlink_inode_operations = {
89 .get_link = page_get_link,
90 .getattr = ocfs2_getattr,
91 .setattr = ocfs2_setattr,
92 .listxattr = ocfs2_listxattr,
93 .fiemap = ocfs2_fiemap,
94 };
95
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