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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 |
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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]); |
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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]); |
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30 | } |
31 | ||
8cb681b9 | 32 | static inline u_long |
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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) { |
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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); |
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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 | } |