1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2000-2001 Christoph Hellwig.
4 * Copyright (c) 2016 Krzysztof Blaszkowski
5 */
6
7 /*
8 * Veritas filesystem driver - fileset header routines.
9 */
10 #include <linux/fs.h>
11 #include <linux/buffer_head.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15
16 #include "vxfs.h"
17 #include "vxfs_inode.h"
18 #include "vxfs_extern.h"
19 #include "vxfs_fshead.h"
20
21
22 #ifdef DIAGNOSTIC
23 static void
24 vxfs_dumpfsh(struct vxfs_fsh *fhp)
25 {
26 printk("\n\ndumping fileset header:\n");
27 printk("----------------------------\n");
28 printk("version: %u\n", fhp->fsh_version);
29 printk("fsindex: %u\n", fhp->fsh_fsindex);
30 printk("iauino: %u\tninodes:%u\n",
31 fhp->fsh_iauino, fhp->fsh_ninodes);
32 printk("maxinode: %u\tlctino: %u\n",
33 fhp->fsh_maxinode, fhp->fsh_lctino);
34 printk("nau: %u\n", fhp->fsh_nau);
35 printk("ilistino[0]: %u\tilistino[1]: %u\n",
36 fhp->fsh_ilistino[0], fhp->fsh_ilistino[1]);
37 }
38 #endif
39
40 /**
41 * vxfs_getfsh - read fileset header into memory
42 * @ip: the (fake) fileset header inode
43 * @which: 0 for the structural, 1 for the primary fsh.
44 *
45 * Description:
46 * vxfs_getfsh reads either the structural or primary fileset header
47 * described by @ip into memory.
48 *
49 * Returns:
50 * The fileset header structure on success, else Zero.
51 */
52 static struct vxfs_fsh *
53 vxfs_getfsh(struct inode *ip, int which)
54 {
55 struct buffer_head *bp;
56
57 bp = vxfs_bread(ip, which);
58 if (bp) {
59 struct vxfs_fsh *fhp;
60
61 if (!(fhp = kmalloc(sizeof(*fhp), GFP_KERNEL)))
62 goto out;
63 memcpy(fhp, bp->b_data, sizeof(*fhp));
64
65 put_bh(bp);
66 return (fhp);
67 }
68 out:
69 brelse(bp);
70 return NULL;
71 }
72
73 /**
74 * vxfs_read_fshead - read the fileset headers
75 * @sbp: superblock to which the fileset belongs
76 *
77 * Description:
78 * vxfs_read_fshead will fill the inode and structural inode list in @sb.
79 *
80 * Returns:
81 * Zero on success, else a negative error code (-EINVAL).
82 */
83 int
84 vxfs_read_fshead(struct super_block *sbp)
85 {
86 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
87 struct vxfs_fsh *pfp, *sfp;
88 struct vxfs_inode_info *vip;
89
90 infp->vsi_fship = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino);
91 if (!infp->vsi_fship) {
92 printk(KERN_ERR "vxfs: unable to read fsh inode\n");
93 return -EINVAL;
94 }
95
96 vip = VXFS_INO(infp->vsi_fship);
97 if (!VXFS_ISFSH(vip)) {
98 printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
99 vip->vii_mode & VXFS_TYPE_MASK);
100 goto out_iput_fship;
101 }
102
103 #ifdef DIAGNOSTIC
104 printk("vxfs: fsh inode dump:\n");
105 vxfs_dumpi(vip, infp->vsi_fshino);
106 #endif
107
108 sfp = vxfs_getfsh(infp->vsi_fship, 0);
109 if (!sfp) {
110 printk(KERN_ERR "vxfs: unable to get structural fsh\n");
111 goto out_iput_fship;
112 }
113
114 #ifdef DIAGNOSTIC
115 vxfs_dumpfsh(sfp);
116 #endif
117
118 pfp = vxfs_getfsh(infp->vsi_fship, 1);
119 if (!pfp) {
120 printk(KERN_ERR "vxfs: unable to get primary fsh\n");
121 goto out_free_sfp;
122 }
123
124 #ifdef DIAGNOSTIC
125 vxfs_dumpfsh(pfp);
126 #endif
127
128 infp->vsi_stilist = vxfs_blkiget(sbp, infp->vsi_iext,
129 fs32_to_cpu(infp, sfp->fsh_ilistino[0]));
130 if (!infp->vsi_stilist) {
131 printk(KERN_ERR "vxfs: unable to get structural list inode\n");
132 goto out_free_pfp;
133 }
134 if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
135 printk(KERN_ERR "vxfs: structural list inode is of wrong type (%x)\n",
136 VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
137 goto out_iput_stilist;
138 }
139
140 infp->vsi_ilist = vxfs_stiget(sbp, fs32_to_cpu(infp, pfp->fsh_ilistino[0]));
141 if (!infp->vsi_ilist) {
142 printk(KERN_ERR "vxfs: unable to get inode list inode\n");
143 goto out_iput_stilist;
144 }
145 if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
146 printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
147 VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
148 goto out_iput_ilist;
149 }
150
151 kfree(pfp);
152 kfree(sfp);
153 return 0;
154
155 out_iput_ilist:
156 iput(infp->vsi_ilist);
157 out_iput_stilist:
158 iput(infp->vsi_stilist);
159 out_free_pfp:
160 kfree(pfp);
161 out_free_sfp:
162 kfree(sfp);
163 out_iput_fship:
164 iput(infp->vsi_fship);
165 return -EINVAL;
166 }
167
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