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 - fileset header routines.
32 */
33 #include <linux/fs.h>
34 #include <linux/buffer_head.h>
35 #include <linux/kernel.h>
36 #include <linux/slab.h>
37 #include <linux/string.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
46 static void
vxfs_dumpfsh(struct vxfs_fsh * fhp)47 vxfs_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 */
75 static struct vxfs_fsh *
vxfs_getfsh(struct inode * ip,int which)76 vxfs_getfsh(struct inode *ip, int which)
77 {
78 struct buffer_head *bp;
79
80 bp = vxfs_bread(ip, which);
81 if (bp) {
82 struct vxfs_fsh *fhp;
83
84 if (!(fhp = kmalloc(sizeof(*fhp), GFP_KERNEL)))
85 goto out;
86 memcpy(fhp, bp->b_data, sizeof(*fhp));
87
88 put_bh(bp);
89 return (fhp);
90 }
91 out:
92 brelse(bp);
93 return NULL;
94 }
95
96 /**
97 * vxfs_read_fshead - read the fileset headers
98 * @sbp: superblock to which the fileset belongs
99 *
100 * Description:
101 * vxfs_read_fshead will fill the inode and structural inode list in @sb.
102 *
103 * Returns:
104 * Zero on success, else a negative error code (-EINVAL).
105 */
106 int
vxfs_read_fshead(struct super_block * sbp)107 vxfs_read_fshead(struct super_block *sbp)
108 {
109 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
110 struct vxfs_fsh *pfp, *sfp;
111 struct vxfs_inode_info *vip, *tip;
112
113 vip = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino);
114 if (!vip) {
115 printk(KERN_ERR "vxfs: unable to read fsh inode\n");
116 return -EINVAL;
117 }
118 if (!VXFS_ISFSH(vip)) {
119 printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
120 vip->vii_mode & VXFS_TYPE_MASK);
121 goto out_free_fship;
122 }
123
124
125 #ifdef DIAGNOSTIC
126 printk("vxfs: fsh inode dump:\n");
127 vxfs_dumpi(vip, infp->vsi_fshino);
128 #endif
129
130 infp->vsi_fship = vxfs_get_fake_inode(sbp, vip);
131 if (!infp->vsi_fship) {
132 printk(KERN_ERR "vxfs: unable to get fsh inode\n");
133 goto out_free_fship;
134 }
135
136 sfp = vxfs_getfsh(infp->vsi_fship, 0);
137 if (!sfp) {
138 printk(KERN_ERR "vxfs: unable to get structural fsh\n");
139 goto out_iput_fship;
140 }
141
142 #ifdef DIAGNOSTIC
143 vxfs_dumpfsh(sfp);
144 #endif
145
146 pfp = vxfs_getfsh(infp->vsi_fship, 1);
147 if (!pfp) {
148 printk(KERN_ERR "vxfs: unable to get primary fsh\n");
149 goto out_free_sfp;
150 }
151
152 #ifdef DIAGNOSTIC
153 vxfs_dumpfsh(pfp);
154 #endif
155
156 tip = vxfs_blkiget(sbp, infp->vsi_iext, sfp->fsh_ilistino[0]);
157 if (!tip)
158 goto out_free_pfp;
159
160 infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip);
161 if (!infp->vsi_stilist) {
162 printk(KERN_ERR "vxfs: unable to get structural list inode\n");
163 kfree(tip);
164 goto out_free_pfp;
165 }
166 if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
167 printk(KERN_ERR "vxfs: structural list inode is of wrong type (%x)\n",
168 VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
169 goto out_iput_stilist;
170 }
171
172 tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);
173 if (!tip)
174 goto out_iput_stilist;
175 infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip);
176 if (!infp->vsi_ilist) {
177 printk(KERN_ERR "vxfs: unable to get inode list inode\n");
178 kfree(tip);
179 goto out_iput_stilist;
180 }
181 if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
182 printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
183 VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
184 goto out_iput_ilist;
185 }
186
187 return 0;
188
189 out_iput_ilist:
190 iput(infp->vsi_ilist);
191 out_iput_stilist:
192 iput(infp->vsi_stilist);
193 out_free_pfp:
194 kfree(pfp);
195 out_free_sfp:
196 kfree(sfp);
197 out_iput_fship:
198 iput(infp->vsi_fship);
199 return -EINVAL;
200 out_free_fship:
201 kfree(vip);
202 return -EINVAL;
203 }
204