2 * Copyright (c) 2000-2001 Christoph Hellwig.
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31 * Veritas filesystem driver - support for 'immed' inodes.
34 #include <linux/pagemap.h>
37 #include "vxfs_inode.h"
40 static int vxfs_immed_follow_link(struct dentry *, struct nameidata *);
42 static int vxfs_immed_readpage(struct file *, struct page *);
45 * Inode operations for immed symlinks.
47 * Unliked all other operations we do not go through the pagecache,
48 * but do all work directly on the inode.
50 struct inode_operations vxfs_immed_symlink_iops = {
51 .readlink = generic_readlink,
52 .follow_link = vxfs_immed_follow_link,
56 * Adress space operations for immed files and directories.
58 struct address_space_operations vxfs_immed_aops = {
59 .readpage = vxfs_immed_readpage,
63 * vxfs_immed_follow_link - follow immed symlink
64 * @dp: dentry for the link
65 * @np: pathname lookup data for the current path walk
68 * vxfs_immed_follow_link restarts the pathname lookup with
69 * the data obtained from @dp.
72 * Zero on success, else a negative error code.
75 vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
77 struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
78 nd_set_link(np, vip->vii_immed.vi_immed);
83 * vxfs_immed_readpage - read part of an immed inode into pagecache
84 * @file: file context (unused)
85 * @page: page frame to fill in.
88 * vxfs_immed_readpage reads a part of the immed area of the
89 * file that hosts @pp into the pagecache.
92 * Zero on success, else a negative error code.
95 * @page is locked and will be unlocked.
98 vxfs_immed_readpage(struct file *fp, struct page *pp)
100 struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host);
101 u_int64_t offset = pp->index << PAGE_CACHE_SHIFT;
105 memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
108 flush_dcache_page(pp);