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: &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(p: link, maxlen: ocfs2_fast_symlink_chars(sb: 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 | |