/* * 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" static __inline__ void vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp) { if (infp->vsi_fshino) BUG(); infp->vsi_fshino = fshp->olt_fsino[0]; } static __inline__ void vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp) { if (infp->vsi_iext) BUG(); infp->vsi_iext = ilistp->olt_iext[0]; } static __inline__ u_long vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize) { if (sbp->s_blocksize % bsize) BUG(); 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 (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 = (char *)bp->b_data + op->olt_size; eaddr = (char *)bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize); while (oaddr < eaddr) { struct vxfs_oltcommon *ocp = (struct vxfs_oltcommon *)oaddr; switch (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 += ocp->olt_size; } brelse(bp); return 0; fail: brelse(bp); return -EINVAL; }