1 /*
2 * Copyright (c) 2000-2001 Christoph Hellwig.
3 * Copyright (c) 2016 Krzysztof Blaszkowski
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions, and the following disclaimer,
11 * without modification.
12 * 2. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * Alternatively, this software may be distributed under the terms of the
16 * GNU General Public License ("GPL").
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 /*
32 * Veritas filesystem driver - fileset header routines.
33 */
34 #include <linux/fs.h>
35 #include <linux/buffer_head.h>
36 #include <linux/kernel.h>
37 #include <linux/slab.h>
38 #include <linux/string.h>
39
40 #include "vxfs.h"
41 #include "vxfs_inode.h"
42 #include "vxfs_extern.h"
43 #include "vxfs_fshead.h"
44
45
46 #ifdef DIAGNOSTIC
47 static void
vxfs_dumpfsh(struct vxfs_fsh * fhp)48 vxfs_dumpfsh(struct vxfs_fsh *fhp)
49 {
50 printk("\n\ndumping fileset header:\n");
51 printk("----------------------------\n");
52 printk("version: %u\n", fhp->fsh_version);
53 printk("fsindex: %u\n", fhp->fsh_fsindex);
54 printk("iauino: %u\tninodes:%u\n",
55 fhp->fsh_iauino, fhp->fsh_ninodes);
56 printk("maxinode: %u\tlctino: %u\n",
57 fhp->fsh_maxinode, fhp->fsh_lctino);
58 printk("nau: %u\n", fhp->fsh_nau);
59 printk("ilistino[0]: %u\tilistino[1]: %u\n",
60 fhp->fsh_ilistino[0], fhp->fsh_ilistino[1]);
61 }
62 #endif
63
64 /**
65 * vxfs_getfsh - read fileset header into memory
66 * @ip: the (fake) fileset header inode
67 * @which: 0 for the structural, 1 for the primary fsh.
68 *
69 * Description:
70 * vxfs_getfsh reads either the structural or primary fileset header
71 * described by @ip into memory.
72 *
73 * Returns:
74 * The fileset header structure on success, else Zero.
75 */
76 static struct vxfs_fsh *
vxfs_getfsh(struct inode * ip,int which)77 vxfs_getfsh(struct inode *ip, int which)
78 {
79 struct buffer_head *bp;
80
81 bp = vxfs_bread(ip, which);
82 if (bp) {
83 struct vxfs_fsh *fhp;
84
85 if (!(fhp = kmalloc(sizeof(*fhp), GFP_KERNEL)))
86 goto out;
87 memcpy(fhp, bp->b_data, sizeof(*fhp));
88
89 put_bh(bp);
90 return (fhp);
91 }
92 out:
93 brelse(bp);
94 return NULL;
95 }
96
97 /**
98 * vxfs_read_fshead - read the fileset headers
99 * @sbp: superblock to which the fileset belongs
100 *
101 * Description:
102 * vxfs_read_fshead will fill the inode and structural inode list in @sb.
103 *
104 * Returns:
105 * Zero on success, else a negative error code (-EINVAL).
106 */
107 int
vxfs_read_fshead(struct super_block * sbp)108 vxfs_read_fshead(struct super_block *sbp)
109 {
110 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
111 struct vxfs_fsh *pfp, *sfp;
112 struct vxfs_inode_info *vip;
113
114 infp->vsi_fship = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino);
115 if (!infp->vsi_fship) {
116 printk(KERN_ERR "vxfs: unable to read fsh inode\n");
117 return -EINVAL;
118 }
119
120 vip = VXFS_INO(infp->vsi_fship);
121 if (!VXFS_ISFSH(vip)) {
122 printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
123 vip->vii_mode & VXFS_TYPE_MASK);
124 goto out_iput_fship;
125 }
126
127 #ifdef DIAGNOSTIC
128 printk("vxfs: fsh inode dump:\n");
129 vxfs_dumpi(vip, infp->vsi_fshino);
130 #endif
131
132 sfp = vxfs_getfsh(infp->vsi_fship, 0);
133 if (!sfp) {
134 printk(KERN_ERR "vxfs: unable to get structural fsh\n");
135 goto out_iput_fship;
136 }
137
138 #ifdef DIAGNOSTIC
139 vxfs_dumpfsh(sfp);
140 #endif
141
142 pfp = vxfs_getfsh(infp->vsi_fship, 1);
143 if (!pfp) {
144 printk(KERN_ERR "vxfs: unable to get primary fsh\n");
145 goto out_free_sfp;
146 }
147
148 #ifdef DIAGNOSTIC
149 vxfs_dumpfsh(pfp);
150 #endif
151
152 infp->vsi_stilist = vxfs_blkiget(sbp, infp->vsi_iext,
153 fs32_to_cpu(infp, sfp->fsh_ilistino[0]));
154 if (!infp->vsi_stilist) {
155 printk(KERN_ERR "vxfs: unable to get structural list inode\n");
156 goto out_free_pfp;
157 }
158 if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
159 printk(KERN_ERR "vxfs: structural list inode is of wrong type (%x)\n",
160 VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
161 goto out_iput_stilist;
162 }
163
164 infp->vsi_ilist = vxfs_stiget(sbp, fs32_to_cpu(infp, pfp->fsh_ilistino[0]));
165 if (!infp->vsi_ilist) {
166 printk(KERN_ERR "vxfs: unable to get inode list inode\n");
167 goto out_iput_stilist;
168 }
169 if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
170 printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
171 VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
172 goto out_iput_ilist;
173 }
174
175 kfree(pfp);
176 kfree(sfp);
177 return 0;
178
179 out_iput_ilist:
180 iput(infp->vsi_ilist);
181 out_iput_stilist:
182 iput(infp->vsi_stilist);
183 out_free_pfp:
184 kfree(pfp);
185 out_free_sfp:
186 kfree(sfp);
187 out_iput_fship:
188 iput(infp->vsi_fship);
189 return -EINVAL;
190 }
191