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
23static void
24vxfs_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 */
52static struct vxfs_fsh *
53vxfs_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	}
68out:
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 */
83int
84vxfs_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