106 строки
2.5 KiB
C
106 строки
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2000-2001 Christoph Hellwig.
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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 hch@infradead.org\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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