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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> | |
35 | #include <linux/namei.h> | |
36 | ||
37 | #include "vxfs.h" | |
8b1919a1 | 38 | #include "vxfs_extern.h" |
1da177e4 LT |
39 | #include "vxfs_inode.h" |
40 | ||
41 | ||
008b150a | 42 | static void * vxfs_immed_follow_link(struct dentry *, struct nameidata *); |
1da177e4 LT |
43 | |
44 | static int vxfs_immed_readpage(struct file *, struct page *); | |
45 | ||
46 | /* | |
47 | * Inode operations for immed symlinks. | |
48 | * | |
49 | * Unliked all other operations we do not go through the pagecache, | |
50 | * but do all work directly on the inode. | |
51 | */ | |
754661f1 | 52 | const struct inode_operations vxfs_immed_symlink_iops = { |
1da177e4 LT |
53 | .readlink = generic_readlink, |
54 | .follow_link = vxfs_immed_follow_link, | |
55 | }; | |
56 | ||
57 | /* | |
c78bad11 | 58 | * Address space operations for immed files and directories. |
1da177e4 | 59 | */ |
f5e54d6e | 60 | const struct address_space_operations vxfs_immed_aops = { |
1da177e4 LT |
61 | .readpage = vxfs_immed_readpage, |
62 | }; | |
63 | ||
64 | /** | |
65 | * vxfs_immed_follow_link - follow immed symlink | |
66 | * @dp: dentry for the link | |
67 | * @np: pathname lookup data for the current path walk | |
68 | * | |
69 | * Description: | |
70 | * vxfs_immed_follow_link restarts the pathname lookup with | |
71 | * the data obtained from @dp. | |
72 | * | |
73 | * Returns: | |
74 | * Zero on success, else a negative error code. | |
75 | */ | |
a5ea169c | 76 | static void * |
1da177e4 LT |
77 | vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np) |
78 | { | |
79 | struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode); | |
80 | nd_set_link(np, vip->vii_immed.vi_immed); | |
008b150a | 81 | return NULL; |
1da177e4 LT |
82 | } |
83 | ||
84 | /** | |
85 | * vxfs_immed_readpage - read part of an immed inode into pagecache | |
86 | * @file: file context (unused) | |
87 | * @page: page frame to fill in. | |
88 | * | |
89 | * Description: | |
90 | * vxfs_immed_readpage reads a part of the immed area of the | |
91 | * file that hosts @pp into the pagecache. | |
92 | * | |
93 | * Returns: | |
94 | * Zero on success, else a negative error code. | |
95 | * | |
96 | * Locking status: | |
97 | * @page is locked and will be unlocked. | |
98 | */ | |
99 | static int | |
100 | vxfs_immed_readpage(struct file *fp, struct page *pp) | |
101 | { | |
102 | struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host); | |
54b21a79 AM |
103 | u_int64_t offset = (u_int64_t)pp->index << PAGE_CACHE_SHIFT; |
104 | caddr_t kaddr; | |
1da177e4 LT |
105 | |
106 | kaddr = kmap(pp); | |
107 | memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE); | |
108 | kunmap(pp); | |
109 | ||
110 | flush_dcache_page(pp); | |
111 | SetPageUptodate(pp); | |
112 | unlock_page(pp); | |
113 | ||
114 | return 0; | |
115 | } |