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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [freevxfs/] [vxfs_immed.c] - Blame information for rev 1275

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1 1275 phoenix
/*
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 * Copyright (c) 2000-2001 Christoph Hellwig.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions, and the following disclaimer,
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 *    without modification.
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 * 2. The name of the author may not be used to endorse or promote products
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 *    derived from this software without specific prior written permission.
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 *
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 * Alternatively, this software may be distributed under the terms of the
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 * GNU General Public License ("GPL").
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#ident "$Id: vxfs_immed.c,v 1.1.1.1 2004-04-15 01:11:42 phoenix Exp $"
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/*
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 * Veritas filesystem driver - support for 'immed' inodes.
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 */
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include "vxfs.h"
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#include "vxfs_inode.h"
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static int      vxfs_immed_readlink(struct dentry *, char *, int);
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static int      vxfs_immed_follow_link(struct dentry *, struct nameidata *);
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static int      vxfs_immed_readpage(struct file *, struct page *);
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/*
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 * Inode operations for immed symlinks.
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 *
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 * Unliked all other operations we do not go through the pagecache,
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 * but do all work directly on the inode.
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 */
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struct inode_operations vxfs_immed_symlink_iops = {
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        .readlink =             vxfs_immed_readlink,
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        .follow_link =          vxfs_immed_follow_link,
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};
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/*
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 * Adress space operations for immed files and directories.
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 */
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struct address_space_operations vxfs_immed_aops = {
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        .readpage =             vxfs_immed_readpage,
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};
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/**
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 * vxfs_immed_readlink - read immed symlink
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 * @dp:         dentry for the link
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 * @bp:         output buffer
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 * @buflen:     length of @bp
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 *
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 * Description:
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 *   vxfs_immed_readlink calls vfs_readlink to read the link
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 *   described by @dp into userspace.
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 *
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 * Returns:
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 *   Number of bytes successfully copied to userspace.
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 */
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static int
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vxfs_immed_readlink(struct dentry *dp, char *bp, int buflen)
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{
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        struct vxfs_inode_info          *vip = VXFS_INO(dp->d_inode);
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        return (vfs_readlink(dp, bp, buflen, vip->vii_immed.vi_immed));
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}
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/**
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 * vxfs_immed_follow_link - follow immed symlink
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 * @dp:         dentry for the link
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 * @np:         pathname lookup data for the current path walk
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 *
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 * Description:
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 *   vxfs_immed_follow_link restarts the pathname lookup with
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 *   the data obtained from @dp.
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 *
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 * Returns:
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 *   Zero on success, else a negative error code.
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 */
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static int
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vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
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{
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        struct vxfs_inode_info          *vip = VXFS_INO(dp->d_inode);
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        return (vfs_follow_link(np, vip->vii_immed.vi_immed));
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}
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/**
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 * vxfs_immed_readpage - read part of an immed inode into pagecache
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 * @file:       file context (unused)
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 * @page:       page frame to fill in.
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 *
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 * Description:
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 *   vxfs_immed_readpage reads a part of the immed area of the
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 *   file that hosts @pp into the pagecache.
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 *
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 * Returns:
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 *   Zero on success, else a negative error code.
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 *
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 * Locking status:
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 *   @page is locked and will be unlocked.
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 */
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static int
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vxfs_immed_readpage(struct file *fp, struct page *pp)
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{
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        struct vxfs_inode_info  *vip = VXFS_INO(pp->mapping->host);
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        u_int64_t               offset = pp->index << PAGE_CACHE_SHIFT;
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        caddr_t                 kaddr;
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        kaddr = kmap(pp);
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        memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
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        kunmap(pp);
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        flush_dcache_page(pp);
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        SetPageUptodate(pp);
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        UnlockPage(pp);
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        return 0;
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}

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