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(size: sizeof(*fhp), GFP_KERNEL))) |
62 | goto out; |
63 | memcpy(fhp, bp->b_data, sizeof(*fhp)); |
64 | |
65 | put_bh(bh: bp); |
66 | return (fhp); |
67 | } |
68 | out: |
69 | brelse(bh: 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(inode: 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(ip: infp->vsi_fship, which: 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(ip: infp->vsi_fship, which: 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(sbi: infp, a: 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(sbi: infp, a: 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(objp: pfp); |
152 | kfree(objp: 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(objp: pfp); |
161 | out_free_sfp: |
162 | kfree(objp: sfp); |
163 | out_iput_fship: |
164 | iput(infp->vsi_fship); |
165 | return -EINVAL; |
166 | } |
167 | |