projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0b1e987c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 1da177e4 LT |
2 | /* |
| 3 | * Copyright (c) 2000-2001 Christoph Hellwig. | |
| 1da177e4 LT |
4 | */ |
| 5 | ||
| 6 | /* | |
| 7 | * Veritas filesystem driver - object location table support. | |
| 8 | */ | |
| 9 | #include <linux/fs.h> | |
| 10 | #include <linux/buffer_head.h> | |
| 11 | #include <linux/kernel.h> | |
| 12 | ||
| 13 | #include "vxfs.h" | |
| 14 | #include "vxfs_olt.h" | |
| 6e1e8e11 | 15 | #include "vxfs_extern.h" |
| 1da177e4 LT |
16 | |
| 17 | ||
| 8cb681b9 | 18 | static inline void |
| 1da177e4 LT |
19 | vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp) |
| 20 | { | |
| 7ec70738 | 21 | BUG_ON(infp->vsi_fshino); |
| 0d83f7fc | 22 | infp->vsi_fshino = fs32_to_cpu(infp, fshp->olt_fsino[0]); |
| 1da177e4 LT |
23 | } |
| 24 | ||
| 8cb681b9 | 25 | static inline void |
| 1da177e4 LT |
26 | vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp) |
| 27 | { | |
| 7ec70738 | 28 | BUG_ON(infp->vsi_iext); |
| 0d83f7fc | 29 | infp->vsi_iext = fs32_to_cpu(infp, ilistp->olt_iext[0]); |
| 1da177e4 LT |
30 | } |
| 31 | ||
| 8cb681b9 | 32 | static inline u_long |
| 1da177e4 LT |
33 | vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize) |
| 34 | { | |
| 7ec70738 | 35 | BUG_ON(sbp->s_blocksize % bsize); |
| 1da177e4 LT |
36 | return (block * (sbp->s_blocksize / bsize)); |
| 37 | } | |
| 38 | ||
| 39 | ||
| 40 | /** | |
| 41 | * vxfs_read_olt - read olt | |
| 42 | * @sbp: superblock of the filesystem | |
| 43 | * @bsize: blocksize of the filesystem | |
| 44 | * | |
| 45 | * Description: | |
| 46 | * vxfs_read_olt reads the olt of the filesystem described by @sbp | |
| 47 | * into main memory and does some basic setup. | |
| 48 | * | |
| 49 | * Returns: | |
| 50 | * Zero on success, else a negative error code. | |
| 51 | */ | |
| 52 | int | |
| 53 | vxfs_read_olt(struct super_block *sbp, u_long bsize) | |
| 54 | { | |
| 55 | struct vxfs_sb_info *infp = VXFS_SBI(sbp); | |
| 56 | struct buffer_head *bp; | |
| 57 | struct vxfs_olt *op; | |
| 58 | char *oaddr, *eaddr; | |
| 59 | ||
| 1da177e4 LT |
60 | bp = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, bsize)); |
| 61 | if (!bp || !bp->b_data) | |
| 62 | goto fail; | |
| 63 | ||
| 64 | op = (struct vxfs_olt *)bp->b_data; | |
| 0d83f7fc | 65 | if (fs32_to_cpu(infp, op->olt_magic) != VXFS_OLT_MAGIC) { |
| 1da177e4 LT |
66 | printk(KERN_NOTICE "vxfs: ivalid olt magic number\n"); |
| 67 | goto fail; | |
| 68 | } | |
| 69 | ||
| 70 | /* | |
| 71 | * It is in theory possible that vsi_oltsize is > 1. | |
| 72 | * I've not seen any such filesystem yet and I'm lazy.. --hch | |
| 73 | */ | |
| 74 | if (infp->vsi_oltsize > 1) { | |
| 75 | printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n"); | |
| 76 | printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\n"); | |
| 77 | goto fail; | |
| 78 | } | |
| 79 | ||
| 0d83f7fc | 80 | oaddr = bp->b_data + fs32_to_cpu(infp, op->olt_size); |
| 8cb681b9 | 81 | eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize); |
| 1da177e4 LT |
82 | |
| 83 | while (oaddr < eaddr) { | |
| 84 | struct vxfs_oltcommon *ocp = | |
| 85 | (struct vxfs_oltcommon *)oaddr; | |
| 86 | ||
| 0d83f7fc | 87 | switch (fs32_to_cpu(infp, ocp->olt_type)) { |
| 1da177e4 LT |
88 | case VXFS_OLT_FSHEAD: |
| 89 | vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp); | |
| 90 | break; | |
| 91 | case VXFS_OLT_ILIST: | |
| 92 | vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp); | |
| 93 | break; | |
| 94 | } | |
| 95 | ||
| 0d83f7fc | 96 | oaddr += fs32_to_cpu(infp, ocp->olt_size); |
| 1da177e4 LT |
97 | } |
| 98 | ||
| 99 | brelse(bp); | |
| 0d83f7fc | 100 | return (infp->vsi_fshino && infp->vsi_iext) ? 0 : -EINVAL; |
| 1da177e4 LT |
101 | |
| 102 | fail: | |
| 103 | brelse(bp); | |
| 104 | return -EINVAL; | |
| 105 | } |