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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" |
38 | #include "vxfs_extern.h" |
39 | #include "vxfs_inode.h" |
40 | |
41 | |
42 | static void * vxfs_immed_follow_link(struct dentry *, struct nameidata *); |
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 | */ |
52 | const struct inode_operations vxfs_immed_symlink_iops = { |
53 | .readlink = generic_readlink, |
54 | .follow_link = vxfs_immed_follow_link, |
55 | }; |
56 | |
57 | /* |
58 | * Address space operations for immed files and directories. |
59 | */ |
60 | const struct address_space_operations vxfs_immed_aops = { |
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 | */ |
76 | static void * |
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); |
81 | return NULL; |
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); |
103 | u_int64_t offset = (u_int64_t)pp->index << PAGE_CACHE_SHIFT; |
104 | caddr_t kaddr; |
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 | } |
116 |
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Tags:
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v2.6.34-rc5
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