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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" |
39 | #include "vxfs_extern.h" |
40 | |
41 | |
42 | static inline void |
43 | vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp) |
44 | { |
45 | BUG_ON(infp->vsi_fshino); |
46 | infp->vsi_fshino = fshp->olt_fsino[0]; |
47 | } |
48 | |
49 | static inline void |
50 | vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp) |
51 | { |
52 | BUG_ON(infp->vsi_iext); |
53 | infp->vsi_iext = ilistp->olt_iext[0]; |
54 | } |
55 | |
56 | static inline u_long |
57 | vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize) |
58 | { |
59 | BUG_ON(sbp->s_blocksize % bsize); |
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 | |
105 | oaddr = bp->b_data + op->olt_size; |
106 | eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize); |
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 | } |
131 |
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