aboutsummaryrefslogtreecommitdiffstats
path: root/fs/freevxfs/vxfs_immed.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/freevxfs/vxfs_immed.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/freevxfs/vxfs_immed.c')
-rw-r--r--fs/freevxfs/vxfs_immed.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_immed.c b/fs/freevxfs/vxfs_immed.c
new file mode 100644
index 000000000000..ac677ab262b2
--- /dev/null
+++ b/fs/freevxfs/vxfs_immed.c
@@ -0,0 +1,114 @@
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_inode.h"
39
40
41static int vxfs_immed_follow_link(struct dentry *, struct nameidata *);
42
43static int vxfs_immed_readpage(struct file *, struct page *);
44
45/*
46 * Inode operations for immed symlinks.
47 *
48 * Unliked all other operations we do not go through the pagecache,
49 * but do all work directly on the inode.
50 */
51struct inode_operations vxfs_immed_symlink_iops = {
52 .readlink = generic_readlink,
53 .follow_link = vxfs_immed_follow_link,
54};
55
56/*
57 * Adress space operations for immed files and directories.
58 */
59struct address_space_operations vxfs_immed_aops = {
60 .readpage = vxfs_immed_readpage,
61};
62
63/**
64 * vxfs_immed_follow_link - follow immed symlink
65 * @dp: dentry for the link
66 * @np: pathname lookup data for the current path walk
67 *
68 * Description:
69 * vxfs_immed_follow_link restarts the pathname lookup with
70 * the data obtained from @dp.
71 *
72 * Returns:
73 * Zero on success, else a negative error code.
74 */
75static int
76vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
77{
78 struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
79 nd_set_link(np, vip->vii_immed.vi_immed);
80 return 0;
81}
82
83/**
84 * vxfs_immed_readpage - read part of an immed inode into pagecache
85 * @file: file context (unused)
86 * @page: page frame to fill in.
87 *
88 * Description:
89 * vxfs_immed_readpage reads a part of the immed area of the
90 * file that hosts @pp into the pagecache.
91 *
92 * Returns:
93 * Zero on success, else a negative error code.
94 *
95 * Locking status:
96 * @page is locked and will be unlocked.
97 */
98static int
99vxfs_immed_readpage(struct file *fp, struct page *pp)
100{
101 struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host);
102 u_int64_t offset = pp->index << PAGE_CACHE_SHIFT;
103 caddr_t kaddr;
104
105 kaddr = kmap(pp);
106 memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
107 kunmap(pp);
108
109 flush_dcache_page(pp);
110 SetPageUptodate(pp);
111 unlock_page(pp);
112
113 return 0;
114}