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81 lines
2.6 KiB
81 lines
2.6 KiB
/* |
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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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/* |
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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_extern.h" |
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#include "vxfs_inode.h" |
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static int vxfs_immed_readpage(struct file *, struct page *); |
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/* |
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* Address space operations for immed files and directories. |
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*/ |
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const 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_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 = (u_int64_t)pp->index << PAGE_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_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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unlock_page(pp); |
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return 0; |
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}
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