134 строки
3.6 KiB
C
134 строки
3.6 KiB
C
/*
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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 - object location table support.
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*/
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/kernel.h>
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#include "vxfs.h"
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#include "vxfs_olt.h"
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#include "vxfs_extern.h"
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static inline void
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vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp)
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{
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if (infp->vsi_fshino)
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BUG();
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infp->vsi_fshino = fshp->olt_fsino[0];
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}
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static inline void
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vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp)
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{
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if (infp->vsi_iext)
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BUG();
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infp->vsi_iext = ilistp->olt_iext[0];
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}
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static inline u_long
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vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize)
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{
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if (sbp->s_blocksize % bsize)
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BUG();
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return (block * (sbp->s_blocksize / bsize));
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}
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/**
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* vxfs_read_olt - read olt
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* @sbp: superblock of the filesystem
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* @bsize: blocksize of the filesystem
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*
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* Description:
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* vxfs_read_olt reads the olt of the filesystem described by @sbp
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* into main memory and does some basic setup.
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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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int
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vxfs_read_olt(struct super_block *sbp, u_long bsize)
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{
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struct vxfs_sb_info *infp = VXFS_SBI(sbp);
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struct buffer_head *bp;
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struct vxfs_olt *op;
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char *oaddr, *eaddr;
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bp = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, bsize));
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if (!bp || !bp->b_data)
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goto fail;
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op = (struct vxfs_olt *)bp->b_data;
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if (op->olt_magic != VXFS_OLT_MAGIC) {
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printk(KERN_NOTICE "vxfs: ivalid olt magic number\n");
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goto fail;
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}
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/*
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* It is in theory possible that vsi_oltsize is > 1.
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* I've not seen any such filesystem yet and I'm lazy.. --hch
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*/
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if (infp->vsi_oltsize > 1) {
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printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n");
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printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\n");
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goto fail;
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}
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oaddr = bp->b_data + op->olt_size;
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eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize);
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while (oaddr < eaddr) {
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struct vxfs_oltcommon *ocp =
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(struct vxfs_oltcommon *)oaddr;
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switch (ocp->olt_type) {
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case VXFS_OLT_FSHEAD:
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vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp);
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break;
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case VXFS_OLT_ILIST:
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vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp);
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break;
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}
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oaddr += ocp->olt_size;
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}
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brelse(bp);
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return 0;
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fail:
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brelse(bp);
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return -EINVAL;
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}
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