diff options
Diffstat (limited to 'fs/freevxfs/vxfs_olt.c')
| -rw-r--r-- | fs/freevxfs/vxfs_olt.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_olt.c b/fs/freevxfs/vxfs_olt.c new file mode 100644 index 000000000..813da6685 --- /dev/null +++ b/fs/freevxfs/vxfs_olt.c @@ -0,0 +1,129 @@ +/* + * Copyright (c) 2000-2001 Christoph Hellwig. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL"). + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Veritas filesystem driver - object location table support. + */ +#include <linux/fs.h> +#include <linux/buffer_head.h> +#include <linux/kernel.h> + +#include "vxfs.h" +#include "vxfs_olt.h" +#include "vxfs_extern.h" + + +static inline void +vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp) +{ + BUG_ON(infp->vsi_fshino); + infp->vsi_fshino = fs32_to_cpu(infp, fshp->olt_fsino[0]); +} + +static inline void +vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp) +{ + BUG_ON(infp->vsi_iext); + infp->vsi_iext = fs32_to_cpu(infp, ilistp->olt_iext[0]); +} + +static inline u_long +vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize) +{ + BUG_ON(sbp->s_blocksize % bsize); + return (block * (sbp->s_blocksize / bsize)); +} + + +/** + * vxfs_read_olt - read olt + * @sbp: superblock of the filesystem + * @bsize: blocksize of the filesystem + * + * Description: + * vxfs_read_olt reads the olt of the filesystem described by @sbp + * into main memory and does some basic setup. + * + * Returns: + * Zero on success, else a negative error code. + */ +int +vxfs_read_olt(struct super_block *sbp, u_long bsize) +{ + struct vxfs_sb_info *infp = VXFS_SBI(sbp); + struct buffer_head *bp; + struct vxfs_olt *op; + char *oaddr, *eaddr; + + bp = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, bsize)); + if (!bp || !bp->b_data) + goto fail; + + op = (struct vxfs_olt *)bp->b_data; + if (fs32_to_cpu(infp, op->olt_magic) != VXFS_OLT_MAGIC) { + printk(KERN_NOTICE "vxfs: ivalid olt magic number\n"); + goto fail; + } + + /* + * It is in theory possible that vsi_oltsize is > 1. + * I've not seen any such filesystem yet and I'm lazy.. --hch + */ + if (infp->vsi_oltsize > 1) { + printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n"); + printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\n"); + goto fail; + } + + oaddr = bp->b_data + fs32_to_cpu(infp, op->olt_size); + eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize); + + while (oaddr < eaddr) { + struct vxfs_oltcommon *ocp = + (struct vxfs_oltcommon *)oaddr; + + switch (fs32_to_cpu(infp, ocp->olt_type)) { + case VXFS_OLT_FSHEAD: + vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp); + break; + case VXFS_OLT_ILIST: + vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp); + break; + } + + oaddr += fs32_to_cpu(infp, ocp->olt_size); + } + + brelse(bp); + return (infp->vsi_fshino && infp->vsi_iext) ? 0 : -EINVAL; + +fail: + brelse(bp); + return -EINVAL; +} |