2 * Copyright (c) 2000-2001 Christoph Hellwig.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
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
31 * Veritas filesystem driver - object location table support.
34 #include <linux/buffer_head.h>
35 #include <linux/kernel.h>
39 #include "vxfs_extern.h"
43 vxfs_get_fshead(struct vxfs_oltfshead
*fshp
, struct vxfs_sb_info
*infp
)
45 BUG_ON(infp
->vsi_fshino
);
46 infp
->vsi_fshino
= fshp
->olt_fsino
[0];
50 vxfs_get_ilist(struct vxfs_oltilist
*ilistp
, struct vxfs_sb_info
*infp
)
52 BUG_ON(infp
->vsi_iext
);
53 infp
->vsi_iext
= ilistp
->olt_iext
[0];
57 vxfs_oblock(struct super_block
*sbp
, daddr_t block
, u_long bsize
)
59 BUG_ON(sbp
->s_blocksize
% bsize
);
60 return (block
* (sbp
->s_blocksize
/ bsize
));
65 * vxfs_read_olt - read olt
66 * @sbp: superblock of the filesystem
67 * @bsize: blocksize of the filesystem
70 * vxfs_read_olt reads the olt of the filesystem described by @sbp
71 * into main memory and does some basic setup.
74 * Zero on success, else a negative error code.
77 vxfs_read_olt(struct super_block
*sbp
, u_long bsize
)
79 struct vxfs_sb_info
*infp
= VXFS_SBI(sbp
);
80 struct buffer_head
*bp
;
85 bp
= sb_bread(sbp
, vxfs_oblock(sbp
, infp
->vsi_oltext
, bsize
));
86 if (!bp
|| !bp
->b_data
)
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");
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
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");
105 oaddr
= bp
->b_data
+ op
->olt_size
;
106 eaddr
= bp
->b_data
+ (infp
->vsi_oltsize
* sbp
->s_blocksize
);
108 while (oaddr
< eaddr
) {
109 struct vxfs_oltcommon
*ocp
=
110 (struct vxfs_oltcommon
*)oaddr
;
112 switch (ocp
->olt_type
) {
113 case VXFS_OLT_FSHEAD
:
114 vxfs_get_fshead((struct vxfs_oltfshead
*)oaddr
, infp
);
117 vxfs_get_ilist((struct vxfs_oltilist
*)oaddr
, infp
);
121 oaddr
+= ocp
->olt_size
;
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