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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2001 Christoph Hellwig. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions, and the following disclaimer, | |
10 | * without modification. | |
11 | * 2. The name of the author may not be used to endorse or promote products | |
12 | * derived from this software without specific prior written permission. | |
13 | * | |
14 | * Alternatively, this software may be distributed under the terms of the | |
15 | * GNU General Public License ("GPL"). | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR | |
21 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | /* | |
31 | * Veritas filesystem driver - support for 'immed' inodes. | |
32 | */ | |
33 | #include <linux/fs.h> | |
34 | #include <linux/pagemap.h> | |
1da177e4 LT |
35 | |
36 | #include "vxfs.h" | |
8b1919a1 | 37 | #include "vxfs_extern.h" |
1da177e4 LT |
38 | #include "vxfs_inode.h" |
39 | ||
40 | ||
1da177e4 LT |
41 | static int vxfs_immed_readpage(struct file *, struct page *); |
42 | ||
1da177e4 | 43 | /* |
c78bad11 | 44 | * Address space operations for immed files and directories. |
1da177e4 | 45 | */ |
f5e54d6e | 46 | const struct address_space_operations vxfs_immed_aops = { |
1da177e4 LT |
47 | .readpage = vxfs_immed_readpage, |
48 | }; | |
49 | ||
1da177e4 LT |
50 | /** |
51 | * vxfs_immed_readpage - read part of an immed inode into pagecache | |
52 | * @file: file context (unused) | |
53 | * @page: page frame to fill in. | |
54 | * | |
55 | * Description: | |
56 | * vxfs_immed_readpage reads a part of the immed area of the | |
57 | * file that hosts @pp into the pagecache. | |
58 | * | |
59 | * Returns: | |
60 | * Zero on success, else a negative error code. | |
61 | * | |
62 | * Locking status: | |
63 | * @page is locked and will be unlocked. | |
64 | */ | |
65 | static int | |
66 | vxfs_immed_readpage(struct file *fp, struct page *pp) | |
67 | { | |
68 | struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host); | |
09cbfeaf | 69 | u_int64_t offset = (u_int64_t)pp->index << PAGE_SHIFT; |
54b21a79 | 70 | caddr_t kaddr; |
1da177e4 LT |
71 | |
72 | kaddr = kmap(pp); | |
09cbfeaf | 73 | memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_SIZE); |
1da177e4 LT |
74 | kunmap(pp); |
75 | ||
76 | flush_dcache_page(pp); | |
77 | SetPageUptodate(pp); | |
78 | unlock_page(pp); | |
79 | ||
80 | return 0; | |
81 | } |