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
40
41 static __inline__ void
42 vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp)
43 {
44 if (infp->vsi_fshino)
45 BUG();
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 if (infp->vsi_iext)
53 BUG();
54 infp->vsi_iext = ilistp->olt_iext[0];
55 }
56
57 static __inline__ u_long
58 vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize)
59 {
60 if (sbp->s_blocksize % bsize)
61 BUG();
62 return (block * (sbp->s_blocksize / bsize));
63 }
64
65
66 /**
67 * vxfs_read_olt - read olt
68 * @sbp: superblock of the filesystem
69 * @bsize: blocksize of the filesystem
70 *
71 * Description:
72 * vxfs_read_olt reads the olt of the filesystem described by @sbp
73 * into main memory and does some basic setup.
74 *
75 * Returns:
76 * Zero on success, else a negative error code.
77 */
78 int
79 vxfs_read_olt(struct super_block *sbp, u_long bsize)
80 {
81 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
82 struct buffer_head *bp;
83 struct vxfs_olt *op;
84 char *oaddr, *eaddr;
85
86
87 bp = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, bsize));
88 if (!bp || !bp->b_data)
89 goto fail;
90
91 op = (struct vxfs_olt *)bp->b_data;
92 if (op->olt_magic != VXFS_OLT_MAGIC) {
93 printk(KERN_NOTICE "vxfs: ivalid olt magic number\n");
94 goto fail;
95 }
96
97 /*
98 * It is in theory possible that vsi_oltsize is > 1.
99 * I've not seen any such filesystem yet and I'm lazy.. --hch
100 */
101 if (infp->vsi_oltsize > 1) {
102 printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n");
103 printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\n");
104 goto fail;
105 }
106
107 oaddr = (char *)bp->b_data + op->olt_size;
108 eaddr = (char *)bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize);
109
110 while (oaddr < eaddr) {
111 struct vxfs_oltcommon *ocp =
112 (struct vxfs_oltcommon *)oaddr;
113
114 switch (ocp->olt_type) {
115 case VXFS_OLT_FSHEAD:
116 vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp);
117 break;
118 case VXFS_OLT_ILIST:
119 vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp);
120 break;
121 }
122
123 oaddr += ocp->olt_size;
124 }
125
126 brelse(bp);
127 return 0;
128
129 fail:
130 brelse(bp);
131 return -EINVAL;
132 }
133
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