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129 lines
3.8 KiB
129 lines
3.8 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 - 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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BUG_ON(infp->vsi_fshino); |
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infp->vsi_fshino = fs32_to_cpu(infp, 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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BUG_ON(infp->vsi_iext); |
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infp->vsi_iext = fs32_to_cpu(infp, 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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BUG_ON(sbp->s_blocksize % bsize); |
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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 (fs32_to_cpu(infp, 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 [email protected]\n"); |
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goto fail; |
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} |
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oaddr = bp->b_data + fs32_to_cpu(infp, 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 (fs32_to_cpu(infp, 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 += fs32_to_cpu(infp, ocp->olt_size); |
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} |
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brelse(bp); |
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return (infp->vsi_fshino && infp->vsi_iext) ? 0 : -EINVAL; |
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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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