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_readlink(struct dentry *, char __user *, int);
41 static int vxfs_immed_follow_link(struct dentry *, struct nameidata *);
43 static int vxfs_immed_readpage(struct file *, struct page *);
46 * Inode operations for immed symlinks.
48 * Unliked all other operations we do not go through the pagecache,
49 * but do all work directly on the inode.
51 struct inode_operations vxfs_immed_symlink_iops = {
52 .readlink = vxfs_immed_readlink,
53 .follow_link = vxfs_immed_follow_link,
57 * Adress space operations for immed files and directories.
59 struct address_space_operations vxfs_immed_aops = {
60 .readpage = vxfs_immed_readpage,
65 * vxfs_immed_readlink - read immed symlink
66 * @dp: dentry for the link
68 * @buflen: length of @bp
71 * vxfs_immed_readlink calls vfs_readlink to read the link
72 * described by @dp into userspace.
75 * Number of bytes successfully copied to userspace.
78 vxfs_immed_readlink(struct dentry *dp, char __user *bp, int buflen)
80 struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
82 return (vfs_readlink(dp, bp, buflen, vip->vii_immed.vi_immed));
86 * vxfs_immed_follow_link - follow immed symlink
87 * @dp: dentry for the link
88 * @np: pathname lookup data for the current path walk
91 * vxfs_immed_follow_link restarts the pathname lookup with
92 * the data obtained from @dp.
95 * Zero on success, else a negative error code.
98 vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
100 struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
102 return (vfs_follow_link(np, vip->vii_immed.vi_immed));
106 * vxfs_immed_readpage - read part of an immed inode into pagecache
107 * @file: file context (unused)
108 * @page: page frame to fill in.
111 * vxfs_immed_readpage reads a part of the immed area of the
112 * file that hosts @pp into the pagecache.
115 * Zero on success, else a negative error code.
118 * @page is locked and will be unlocked.
121 vxfs_immed_readpage(struct file *fp, struct page *pp)
123 struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host);
124 u_int64_t offset = pp->index << PAGE_CACHE_SHIFT;
128 memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
131 flush_dcache_page(pp);