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#ident "$Id: vxfs_fshead.c,v 1.1.1.1 2008/10/15 03:27:06 james26_jang Exp $"
31
32/*
33 * Veritas filesystem driver - fileset header routines.
34 */
35#include <linux/fs.h>
36#include <linux/kernel.h>
37#include <linux/slab.h>
38
39#include "vxfs.h"
40#include "vxfs_inode.h"
41#include "vxfs_extern.h"
42#include "vxfs_fshead.h"
43
44
45#ifdef DIAGNOSTIC
46static void
47vxfs_dumpfsh(struct vxfs_fsh *fhp)
48{
49	printk("\n\ndumping fileset header:\n");
50	printk("----------------------------\n");
51	printk("version: %u\n", fhp->fsh_version);
52	printk("fsindex: %u\n", fhp->fsh_fsindex);
53	printk("iauino: %u\tninodes:%u\n",
54			fhp->fsh_iauino, fhp->fsh_ninodes);
55	printk("maxinode: %u\tlctino: %u\n",
56			fhp->fsh_maxinode, fhp->fsh_lctino);
57	printk("nau: %u\n", fhp->fsh_nau);
58	printk("ilistino[0]: %u\tilistino[1]: %u\n",
59			fhp->fsh_ilistino[0], fhp->fsh_ilistino[1]);
60}
61#endif
62
63/**
64 * vxfs_getfsh - read fileset header into memory
65 * @ip:		the (fake) fileset header inode
66 * @which:	0 for the structural, 1 for the primary fsh.
67 *
68 * Description:
69 *   vxfs_getfsh reads either the structural or primary fileset header
70 *   described by @ip into memory.
71 *
72 * Returns:
73 *   The fileset header structure on success, else Zero.
74 */
75static struct vxfs_fsh *
76vxfs_getfsh(struct inode *ip, int which)
77{
78	struct buffer_head		*bp;
79
80	bp = vxfs_bread(ip, which);
81	if (buffer_mapped(bp)) {
82		struct vxfs_fsh		*fhp;
83
84		if (!(fhp = kmalloc(sizeof(*fhp), SLAB_KERNEL)))
85			return NULL;
86		memcpy(fhp, bp->b_data, sizeof(*fhp));
87
88		brelse(bp);
89		return (fhp);
90	}
91
92	return NULL;
93}
94
95/**
96 * vxfs_read_fshead - read the fileset headers
97 * @sbp:	superblock to which the fileset belongs
98 *
99 * Description:
100 *   vxfs_read_fshead will fill the inode and structural inode list in @sb.
101 *
102 * Returns:
103 *   Zero on success, else a negative error code (-EINVAL).
104 */
105int
106vxfs_read_fshead(struct super_block *sbp)
107{
108	struct vxfs_sb_info		*infp = VXFS_SBI(sbp);
109	struct vxfs_fsh			*pfp, *sfp;
110	struct vxfs_inode_info		*vip, *tip;
111
112	if (!(vip = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino))) {
113		printk(KERN_ERR "vxfs: unabled to read fsh inode\n");
114		return -EINVAL;
115	} else if (!VXFS_ISFSH(vip)) {
116		printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
117				vip->vii_mode & VXFS_TYPE_MASK);
118		return -EINVAL;
119	}
120
121
122#ifdef DIAGNOSTIC
123	printk("vxfs: fsh inode dump:\n");
124	vxfs_dumpi(vip, infp->vsi_fshino);
125#endif
126
127	if (!(infp->vsi_fship = vxfs_get_fake_inode(sbp, vip))) {
128		printk(KERN_ERR "vxfs: unabled to get fsh inode\n");
129		return -EINVAL;
130	}
131
132	if (!(sfp = vxfs_getfsh(infp->vsi_fship, 0))) {
133		printk(KERN_ERR "vxfs: unabled to get structural fsh\n");
134		return -EINVAL;
135	}
136
137#ifdef DIAGNOSTIC
138	vxfs_dumpfsh(sfp);
139#endif
140
141	if (!(pfp = vxfs_getfsh(infp->vsi_fship, 1))) {
142		printk(KERN_ERR "vxfs: unabled to get primary fsh\n");
143		return -EINVAL;
144	}
145
146#ifdef DIAGNOSTIC
147	vxfs_dumpfsh(pfp);
148#endif
149
150	tip = vxfs_blkiget(sbp, infp->vsi_iext, sfp->fsh_ilistino[0]);
151	if (!tip || ((infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip)) == NULL)) {
152		printk(KERN_ERR "vxfs: unabled to get structual list inode\n");
153		return -EINVAL;
154	} else if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
155		printk(KERN_ERR "vxfs: structual list inode is of wrong type (%x)\n",
156				VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
157		return -EINVAL;
158	}
159
160	tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);
161	if (!tip || ((infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip)) == NULL)) {
162		printk(KERN_ERR "vxfs: unabled to get inode list inode\n");
163		return -EINVAL;
164	} else if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
165		printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
166				VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
167		return -EINVAL;
168	}
169
170	return 0;
171}
172