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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2001 Christoph Hellwig. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions, and the following disclaimer, | |
10 | * without modification. | |
11 | * 2. The name of the author may not be used to endorse or promote products | |
12 | * derived from this software without specific prior written permission. | |
13 | * | |
14 | * Alternatively, this software may be distributed under the terms of the | |
15 | * GNU General Public License ("GPL"). | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR | |
21 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | /* | |
31 | * Veritas filesystem driver - object location table support. | |
32 | */ | |
33 | #include <linux/fs.h> | |
34 | #include <linux/buffer_head.h> | |
35 | #include <linux/kernel.h> | |
36 | ||
37 | #include "vxfs.h" | |
38 | #include "vxfs_olt.h" | |
6e1e8e11 | 39 | #include "vxfs_extern.h" |
1da177e4 LT |
40 | |
41 | ||
8cb681b9 | 42 | static inline void |
1da177e4 LT |
43 | vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp) |
44 | { | |
7ec70738 | 45 | BUG_ON(infp->vsi_fshino); |
1da177e4 LT |
46 | infp->vsi_fshino = fshp->olt_fsino[0]; |
47 | } | |
48 | ||
8cb681b9 | 49 | static inline void |
1da177e4 LT |
50 | vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp) |
51 | { | |
7ec70738 | 52 | BUG_ON(infp->vsi_iext); |
1da177e4 LT |
53 | infp->vsi_iext = ilistp->olt_iext[0]; |
54 | } | |
55 | ||
8cb681b9 | 56 | static inline u_long |
1da177e4 LT |
57 | vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize) |
58 | { | |
7ec70738 | 59 | BUG_ON(sbp->s_blocksize % bsize); |
1da177e4 LT |
60 | return (block * (sbp->s_blocksize / bsize)); |
61 | } | |
62 | ||
63 | ||
64 | /** | |
65 | * vxfs_read_olt - read olt | |
66 | * @sbp: superblock of the filesystem | |
67 | * @bsize: blocksize of the filesystem | |
68 | * | |
69 | * Description: | |
70 | * vxfs_read_olt reads the olt of the filesystem described by @sbp | |
71 | * into main memory and does some basic setup. | |
72 | * | |
73 | * Returns: | |
74 | * Zero on success, else a negative error code. | |
75 | */ | |
76 | int | |
77 | vxfs_read_olt(struct super_block *sbp, u_long bsize) | |
78 | { | |
79 | struct vxfs_sb_info *infp = VXFS_SBI(sbp); | |
80 | struct buffer_head *bp; | |
81 | struct vxfs_olt *op; | |
82 | char *oaddr, *eaddr; | |
83 | ||
84 | ||
85 | bp = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, bsize)); | |
86 | if (!bp || !bp->b_data) | |
87 | goto fail; | |
88 | ||
89 | op = (struct vxfs_olt *)bp->b_data; | |
90 | if (op->olt_magic != VXFS_OLT_MAGIC) { | |
91 | printk(KERN_NOTICE "vxfs: ivalid olt magic number\n"); | |
92 | goto fail; | |
93 | } | |
94 | ||
95 | /* | |
96 | * It is in theory possible that vsi_oltsize is > 1. | |
97 | * I've not seen any such filesystem yet and I'm lazy.. --hch | |
98 | */ | |
99 | if (infp->vsi_oltsize > 1) { | |
100 | printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n"); | |
101 | printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\n"); | |
102 | goto fail; | |
103 | } | |
104 | ||
8cb681b9 PE |
105 | oaddr = bp->b_data + op->olt_size; |
106 | eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize); | |
1da177e4 LT |
107 | |
108 | while (oaddr < eaddr) { | |
109 | struct vxfs_oltcommon *ocp = | |
110 | (struct vxfs_oltcommon *)oaddr; | |
111 | ||
112 | switch (ocp->olt_type) { | |
113 | case VXFS_OLT_FSHEAD: | |
114 | vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp); | |
115 | break; | |
116 | case VXFS_OLT_ILIST: | |
117 | vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp); | |
118 | break; | |
119 | } | |
120 | ||
121 | oaddr += ocp->olt_size; | |
122 | } | |
123 | ||
124 | brelse(bp); | |
125 | return 0; | |
126 | ||
127 | fail: | |
128 | brelse(bp); | |
129 | return -EINVAL; | |
130 | } |