Release 4.11 fs/efs/super.c

/*
 * super.c
 *
 * Copyright (c) 1999 Al Smith
 *
 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/exportfs.h>
#include <linux/slab.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>

#include "efs.h"
#include <linux/efs_vh.h>
#include <linux/efs_fs_sb.h>

static int efs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int efs_fill_super(struct super_block *s, void *d, int silent);



static struct dentry *efs_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super);
}

Contributors
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Al Viro
33
84.62%
2
40.00%
Linus Torvalds (pre-git)
5
12.82%
2
40.00%
Andries E. Brouwer
1
2.56%
1
20.00%
Total
39
100.00%
5
100.00%



static void efs_kill_sb(struct super_block *s)
{
	struct efs_sb_info *sbi = SUPER_INFO(s);
	kill_block_super(s);
	kfree(sbi);
}

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1
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31
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1
100.00%


static struct file_system_type efs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "efs",
	.mount		= efs_mount,
	.kill_sb	= efs_kill_sb,
	.fs_flags	= FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("efs");


static struct pt_types sgi_pt_types[] = {
	{0x00,		"SGI vh"},
	{0x01,		"SGI trkrepl"},
	{0x02,		"SGI secrepl"},
	{0x03,		"SGI raw"},
	{0x04,		"SGI bsd"},
	{SGI_SYSV,	"SGI sysv"},
	{0x06,		"SGI vol"},
	{SGI_EFS,	"SGI efs"},
	{0x08,		"SGI lv"},
	{0x09,		"SGI rlv"},
	{0x0A,		"SGI xfs"},
	{0x0B,		"SGI xfslog"},
	{0x0C,		"SGI xlv"},
	{0x82,		"Linux swap"},
	{0x83,		"Linux native"},
	{0,		NULL}
};



static struct kmem_cache * efs_inode_cachep;



static struct inode *efs_alloc_inode(struct super_block *sb)
{
	struct efs_inode_info *ei;
	ei = kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

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Linus Torvalds
40
97.56%
1
50.00%
Christoph Lameter
1
2.44%
1
50.00%
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41
100.00%
2
100.00%



static void efs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
}

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Linus Torvalds
18
50.00%
1
50.00%
Nicholas Piggin
18
50.00%
1
50.00%
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36
100.00%
2
100.00%



static void efs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, efs_i_callback);
}

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Nicholas Piggin
21
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1
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21
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1
100.00%



static void init_once(void *foo)
{
	struct efs_inode_info *ei = (struct efs_inode_info *) foo;

	inode_init_once(&ei->vfs_inode);
}

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Linus Torvalds
27
90.00%
1
50.00%
Christoph Lameter
3
10.00%
1
50.00%
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30
100.00%
2
100.00%



static int __init init_inodecache(void)
{
	efs_inode_cachep = kmem_cache_create("efs_inode_cache",
				sizeof(struct efs_inode_info), 0,
				SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
				SLAB_ACCOUNT, init_once);
	if (efs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

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Linus Torvalds
39
86.67%
1
20.00%
Vladimir Davydov
2
4.44%
1
20.00%
Paul Jackson
2
4.44%
1
20.00%
Andrew Morton
1
2.22%
1
20.00%
Fabian Frederick
1
2.22%
1
20.00%
Total
45
100.00%
5
100.00%



static void destroy_inodecache(void)
{
	/*
         * Make sure all delayed rcu free inodes are flushed before we
         * destroy cache.
         */
	rcu_barrier();
	kmem_cache_destroy(efs_inode_cachep);
}

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Linus Torvalds
13
76.47%
1
50.00%
Kirill A. Shutemov
4
23.53%
1
50.00%
Total
17
100.00%
2
100.00%



static int efs_remount(struct super_block *sb, int *flags, char *data)
{
	sync_filesystem(sb);
	*flags |= MS_RDONLY;
	return 0;
}

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Al Viro
27
84.38%
1
50.00%
Theodore Y. Ts'o
5
15.62%
1
50.00%
Total
32
100.00%
2
100.00%


static const struct super_operations efs_superblock_operations = {
	.alloc_inode	= efs_alloc_inode,
	.destroy_inode	= efs_destroy_inode,
	.statfs		= efs_statfs,
	.remount_fs	= efs_remount,
};


static const struct export_operations efs_export_ops = {
	.fh_to_dentry	= efs_fh_to_dentry,
	.fh_to_parent	= efs_fh_to_parent,
	.get_parent	= efs_get_parent,
};



static int __init init_efs_fs(void) {
	int err;
	pr_info(EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
	err = init_inodecache();
	if (err)
		goto out1;
	err = register_filesystem(&efs_fs_type);
	if (err)
		goto out;
	return 0;
out:
	destroy_inodecache();
out1:
	return err;
}

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Linus Torvalds
37
63.79%
1
20.00%
Linus Torvalds (pre-git)
20
34.48%
3
60.00%
Fabian Frederick
1
1.72%
1
20.00%
Total
58
100.00%
5
100.00%



static void __exit exit_efs_fs(void) {
	unregister_filesystem(&efs_fs_type);
	destroy_inodecache();
}

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Linus Torvalds (pre-git)
15
83.33%
2
66.67%
Linus Torvalds
3
16.67%
1
33.33%
Total
18
100.00%
3
100.00%

module_init(init_efs_fs)
module_exit(exit_efs_fs)



static efs_block_t efs_validate_vh(struct volume_header *vh) {
	int		i;
	__be32		cs, *ui;
	int		csum;
	efs_block_t	sblock = 0; /* shuts up gcc */
	struct pt_types	*pt_entry;
	int		pt_type, slice = -1;

	if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
		/*
                 * assume that we're dealing with a partition and allow
                 * read_super() to try and detect a valid superblock
                 * on the next block.
                 */
		return 0;
	}

	ui = ((__be32 *) (vh + 1)) - 1;
	for(csum = 0; ui >= ((__be32 *) vh);) {
		cs = *ui--;
		csum += be32_to_cpu(cs);
	}
	if (csum) {
		pr_warn("SGI disklabel: checksum bad, label corrupted\n");
		return 0;
	}

#ifdef DEBUG
	pr_debug("bf: \"%16s\"\n", vh->vh_bootfile);

	for(i = 0; i < NVDIR; i++) {
		int	j;
		char	name[VDNAMESIZE+1];

		for(j = 0; j < VDNAMESIZE; j++) {
			name[j] = vh->vh_vd[i].vd_name[j];
		}
		name[j] = (char) 0;

		if (name[0]) {
			pr_debug("vh: %8s block: 0x%08x size: 0x%08x\n",
				name, (int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
				(int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
		}
	}
#endif

	for(i = 0; i < NPARTAB; i++) {
		pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
		for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
			if (pt_type == pt_entry->pt_type) break;
		}
#ifdef DEBUG
		if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
			pr_debug("pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
				 i, (int)be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
				 (int)be32_to_cpu(vh->vh_pt[i].pt_nblks),
				 pt_type, (pt_entry->pt_name) ?
				 pt_entry->pt_name : "unknown");
		}
#endif
		if (IS_EFS(pt_type)) {
			sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
			slice = i;
		}
	}

	if (slice == -1) {
		pr_notice("partition table contained no EFS partitions\n");
#ifdef DEBUG
	} else {
		pr_info("using slice %d (type %s, offset 0x%x)\n", slice,
			(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
			sblock);
#endif
	}
	return sblock;
}

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Linus Torvalds (pre-git)
432
96.00%
2
33.33%
Fabian Frederick
12
2.67%
3
50.00%
Al Viro
6
1.33%
1
16.67%
Total
450
100.00%
6
100.00%



static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) {

	if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
		return -1;

	sb->fs_magic     = be32_to_cpu(super->fs_magic);
	sb->total_blocks = be32_to_cpu(super->fs_size);
	sb->first_block  = be32_to_cpu(super->fs_firstcg);
	sb->group_size   = be32_to_cpu(super->fs_cgfsize);
	sb->data_free    = be32_to_cpu(super->fs_tfree);
	sb->inode_free   = be32_to_cpu(super->fs_tinode);
	sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
	sb->total_groups = be16_to_cpu(super->fs_ncg);
    
	return 0;    
}

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Linus Torvalds (pre-git)
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1
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124
100.00%
1
100.00%



static int efs_fill_super(struct super_block *s, void *d, int silent)
{
	struct efs_sb_info *sb;
	struct buffer_head *bh;
	struct inode *root;

 	sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
	if (!sb)
		return -ENOMEM;
	s->s_fs_info = sb;
 
	s->s_magic		= EFS_SUPER_MAGIC;
	if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
		pr_err("device does not support %d byte blocks\n",
			EFS_BLOCKSIZE);
		return -EINVAL;
	}
  
	/* read the vh (volume header) block */
	bh = sb_bread(s, 0);

	if (!bh) {
		pr_err("cannot read volume header\n");
		return -EIO;
	}

	/*
         * if this returns zero then we didn't find any partition table.
         * this isn't (yet) an error - just assume for the moment that
         * the device is valid and go on to search for a superblock.
         */
	sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
	brelse(bh);

	if (sb->fs_start == -1) {
		return -EINVAL;
	}

	bh = sb_bread(s, sb->fs_start + EFS_SUPER);
	if (!bh) {
		pr_err("cannot read superblock\n");
		return -EIO;
	}
		
	if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
#ifdef DEBUG
		pr_warn("invalid superblock at block %u\n",
			sb->fs_start + EFS_SUPER);
#endif
		brelse(bh);
		return -EINVAL;
	}
	brelse(bh);

	if (!(s->s_flags & MS_RDONLY)) {
#ifdef DEBUG
		pr_info("forcing read-only mode\n");
#endif
		s->s_flags |= MS_RDONLY;
	}
	s->s_op   = &efs_superblock_operations;
	s->s_export_op = &efs_export_ops;
	root = efs_iget(s, EFS_ROOTINODE);
	if (IS_ERR(root)) {
		pr_err("get root inode failed\n");
		return PTR_ERR(root);
	}

	s->s_root = d_make_root(root);
	if (!(s->s_root)) {
		pr_err("get root dentry failed\n");
		return -ENOMEM;
	}

	return 0;
}

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Linus Torvalds (pre-git)
206
61.68%
2
11.11%
Al Viro
49
14.67%
5
27.78%
Brian Gerst
23
6.89%
2
11.11%
David Howells
19
5.69%
1
5.56%
Fabian Frederick
14
4.19%
2
11.11%
Linus Torvalds
12
3.59%
2
11.11%
Christoph Hellwig
7
2.10%
1
5.56%
Heloise
2
0.60%
1
5.56%
Panagiotis Issaris
1
0.30%
1
5.56%
Andries E. Brouwer
1
0.30%
1
5.56%
Total
334
100.00%
18
100.00%



static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
	struct super_block *sb = dentry->d_sb;
	struct efs_sb_info *sbi = SUPER_INFO(sb);
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	buf->f_type    = EFS_SUPER_MAGIC;	/* efs magic number */
	buf->f_bsize   = EFS_BLOCKSIZE;		/* blocksize */
	buf->f_blocks  = sbi->total_groups *	/* total data blocks */
			(sbi->group_size - sbi->inode_blocks);
	buf->f_bfree   = sbi->data_free;	/* free data blocks */
	buf->f_bavail  = sbi->data_free;	/* free blocks for non-root */
	buf->f_files   = sbi->total_groups *	/* total inodes */
			sbi->inode_blocks *
			(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
	buf->f_ffree   = sbi->inode_free;	/* free inodes */
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	buf->f_namelen = EFS_MAXNAMELEN;	/* max filename length */

	return 0;
}

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Linus Torvalds (pre-git)
103
59.88%
2
33.33%
Coly Li
62
36.05%
1
16.67%
David Howells
5
2.91%
1
16.67%
Andries E. Brouwer
1
0.58%
1
16.67%
Andrew Morton
1
0.58%
1
16.67%
Total
172
100.00%
6
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
936
54.61%
7
12.96%
Linus Torvalds
201
11.73%
3
5.56%
Al Viro
173
10.09%
9
16.67%
Adrian Bunk
104
6.07%
1
1.85%
Coly Li
62
3.62%
1
1.85%
Christoph Hellwig
43
2.51%
8
14.81%
Nicholas Piggin
39
2.28%
1
1.85%
Andries E. Brouwer
33
1.93%
2
3.70%
Fabian Frederick
28
1.63%
4
7.41%
David Howells
26
1.52%
2
3.70%
Brian Gerst
23
1.34%
2
3.70%
Art Haas
16
0.93%
1
1.85%
Christoph Lameter
6
0.35%
3
5.56%
Theodore Y. Ts'o
5
0.29%
1
1.85%
Eric W. Biedermann
5
0.29%
1
1.85%
Kirill A. Shutemov
4
0.23%
1
1.85%
Heloise
2
0.12%
1
1.85%
Vladimir Davydov
2
0.12%
1
1.85%
Andrew Morton
2
0.12%
2
3.70%
Paul Jackson
2
0.12%
1
1.85%
Panagiotis Issaris
1
0.06%
1
1.85%
Josef 'Jeff' Sipek
1
0.06%
1
1.85%
Total
1714
100.00%
54
100.00%
Directory: fs/efs

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