2 * Copyright (c) 2000-2001 Christoph Hellwig.
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30 #ident "$Id: vxfs_immed.c,v 1.10 2001/04/25 18:11:23 hch Exp hch $"
33 * Veritas filesystem driver - support for 'immed' inodes.
36 #include <linux/pagemap.h>
39 #include "vxfs_inode.h"
42 static int vxfs_immed_readlink(struct dentry *, char *, int);
43 static int vxfs_immed_follow_link(struct dentry *, struct nameidata *);
45 static int vxfs_immed_readpage(struct file *, struct page *);
48 * Inode operations for immed symlinks.
50 * Unliked all other operations we do not go through the pagecache,
51 * but do all work directly on the inode.
53 struct inode_operations vxfs_immed_symlink_iops = {
54 .readlink = vxfs_immed_readlink,
55 .follow_link = vxfs_immed_follow_link,
59 * Adress space operations for immed files and directories.
61 struct address_space_operations vxfs_immed_aops = {
62 .readpage = vxfs_immed_readpage,
67 * vxfs_immed_readlink - read immed symlink
68 * @dp: dentry for the link
70 * @buflen: length of @bp
73 * vxfs_immed_readlink calls vfs_readlink to read the link
74 * described by @dp into userspace.
77 * Number of bytes successfully copied to userspace.
80 vxfs_immed_readlink(struct dentry *dp, char *bp, int buflen)
82 struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
84 return (vfs_readlink(dp, bp, buflen, vip->vii_immed.vi_immed));
88 * vxfs_immed_follow_link - follow immed symlink
89 * @dp: dentry for the link
90 * @np: pathname lookup data for the current path walk
93 * vxfs_immed_follow_link restarts the pathname lookup with
94 * the data obtained from @dp.
97 * Zero on success, else a negative error code.
100 vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
102 struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
104 return (vfs_follow_link(np, vip->vii_immed.vi_immed));
108 * vxfs_immed_readpage - read part of an immed inode into pagecache
109 * @file: file context (unused)
110 * @page: page frame to fill in.
113 * vxfs_immed_readpage reads a part of the immed area of the
114 * file that hosts @pp into the pagecache.
117 * Zero on success, else a negative error code.
120 * @page is locked and will be unlocked.
123 vxfs_immed_readpage(struct file *fp, struct page *pp)
125 struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host);
126 u_int64_t offset = pp->index << PAGE_CACHE_SHIFT;
130 memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
133 flush_dcache_page(pp);