// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2000-2001 Christoph Hellwig. */ /* * 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; }