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