[linux.git] / 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);
}

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

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 = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

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

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

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

	inode_init_once(&ei->vfs_inode);
}

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

static void destroy_inodecache(void)
{
	kmem_cache_destroy(efs_inode_cachep);
}

static void efs_put_super(struct super_block *s)
{
	kfree(s->s_fs_info);
	s->s_fs_info = NULL;
}

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

static const struct super_operations efs_superblock_operations = {
	.alloc_inode	= efs_alloc_inode,
	.destroy_inode	= efs_destroy_inode,
	.put_super	= efs_put_super,
	.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;
	printk("EFS: "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;
}

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

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) {
		printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n");
		return 0;
	}

#ifdef DEBUG
	printk(KERN_DEBUG "EFS: 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]) {
			printk(KERN_DEBUG "EFS: 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)) {
			printk(KERN_DEBUG "EFS: 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) {
		printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n");
#ifdef DEBUG
	} else {
		printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n",
			slice,
			(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
			sblock);
#endif
	}
	return sblock;
}

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;    
}

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;
	int ret = -EINVAL;

 	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)) {
		printk(KERN_ERR "EFS: device does not support %d byte blocks\n",
			EFS_BLOCKSIZE);
		goto out_no_fs_ul;
	}
  
	/* read the vh (volume header) block */
	bh = sb_bread(s, 0);

	if (!bh) {
		printk(KERN_ERR "EFS: cannot read volume header\n");
		goto out_no_fs_ul;
	}

	/*
	 * 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) {
		goto out_no_fs_ul;
	}

	bh = sb_bread(s, sb->fs_start + EFS_SUPER);
	if (!bh) {
		printk(KERN_ERR "EFS: cannot read superblock\n");
		goto out_no_fs_ul;
	}
		
	if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
#ifdef DEBUG
		printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER);
#endif
		brelse(bh);
		goto out_no_fs_ul;
	}
	brelse(bh);

	if (!(s->s_flags & MS_RDONLY)) {
#ifdef DEBUG
		printk(KERN_INFO "EFS: 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)) {
		printk(KERN_ERR "EFS: get root inode failed\n");
		ret = PTR_ERR(root);
		goto out_no_fs;
	}

	s->s_root = d_alloc_root(root);
	if (!(s->s_root)) {
		printk(KERN_ERR "EFS: get root dentry failed\n");
		iput(root);
		ret = -ENOMEM;
		goto out_no_fs;
	}

	return 0;

out_no_fs_ul:
out_no_fs:
	s->s_fs_info = NULL;
	kfree(sb);
	return ret;
}

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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* super.c
	3	*
	4	* Copyright (c) 1999 Al Smith
	5	*
	6	* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
	7	*/
	8
	9	#include <linux/init.h>
	10	#include <linux/module.h>
a5694255	11	#include <linux/exportfs.h>
1da177e4 LT	12	#include <linux/slab.h>
	13	#include <linux/buffer_head.h>
	14	#include <linux/vfs.h>
	15
45254b4f CH	16	#include "efs.h"
	17	#include <linux/efs_vh.h>
	18	#include <linux/efs_fs_sb.h>
	19
726c3342	20	static int efs_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4 LT	21	static int efs_fill_super(struct super_block s, void d, int silent);
1da177e4 LT	22
152a0836 AV	23	static struct dentry efs_mount(struct file_system_type fs_type,
152a0836 AV	24	int flags, const char dev_name, void data)
1da177e4	25	{
152a0836	26	return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super);
1da177e4 LT	27	}
	28
	29	static struct file_system_type efs_fs_type = {
	30	.owner = THIS_MODULE,
	31	.name = "efs",
152a0836	32	.mount = efs_mount,
1da177e4 LT	33	.kill_sb = kill_block_super,
	34	.fs_flags = FS_REQUIRES_DEV,
	35	};
	36
	37	static struct pt_types sgi_pt_types[] = {
	38	{0x00, "SGI vh"},
	39	{0x01, "SGI trkrepl"},
	40	{0x02, "SGI secrepl"},
	41	{0x03, "SGI raw"},
	42	{0x04, "SGI bsd"},
	43	{SGI_SYSV, "SGI sysv"},
	44	{0x06, "SGI vol"},
	45	{SGI_EFS, "SGI efs"},
	46	{0x08, "SGI lv"},
	47	{0x09, "SGI rlv"},
	48	{0x0A, "SGI xfs"},
	49	{0x0B, "SGI xfslog"},
	50	{0x0C, "SGI xlv"},
	51	{0x82, "Linux swap"},
	52	{0x83, "Linux native"},
	53	{0, NULL}
	54	};
	55
	56
e18b890b	57	static struct kmem_cache * efs_inode_cachep;
1da177e4 LT	58
	59	static struct inode efs_alloc_inode(struct super_block sb)
	60	{
	61	struct efs_inode_info *ei;
e94b1766	62	ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
1da177e4 LT	63	if (!ei)
	64	return NULL;
	65	return &ei->vfs_inode;
	66	}
	67
fa0d7e3d	68	static void efs_i_callback(struct rcu_head *head)
1da177e4	69	{
fa0d7e3d NP	70	struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d NP	71	INIT_LIST_HEAD(&inode->i_dentry);
1da177e4 LT	72	kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
	73	}
	74
fa0d7e3d NP	75	static void efs_destroy_inode(struct inode *inode)
	76	{
	77	call_rcu(&inode->i_rcu, efs_i_callback);
	78	}
	79
51cc5068	80	static void init_once(void *foo)
1da177e4 LT	81	{
	82	struct efs_inode_info ei = (struct efs_inode_info ) foo;
	83
a35afb83	84	inode_init_once(&ei->vfs_inode);
1da177e4	85	}
20c2df83	86
1da177e4 LT	87	static int init_inodecache(void)
	88	{
	89	efs_inode_cachep = kmem_cache_create("efs_inode_cache",
	90	sizeof(struct efs_inode_info),
4b6a9316	91	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	92	init_once);
1da177e4 LT	93	if (efs_inode_cachep == NULL)
	94	return -ENOMEM;
	95	return 0;
	96	}
	97
	98	static void destroy_inodecache(void)
	99	{
1a1d92c1	100	kmem_cache_destroy(efs_inode_cachep);
1da177e4 LT	101	}
	102
	103	static void efs_put_super(struct super_block *s)
	104	{
	105	kfree(s->s_fs_info);
	106	s->s_fs_info = NULL;
	107	}
	108
	109	static int efs_remount(struct super_block sb, int flags, char *data)
	110	{
	111	*flags \|= MS_RDONLY;
	112	return 0;
	113	}
	114
ee9b6d61	115	static const struct super_operations efs_superblock_operations = {
1da177e4 LT	116	.alloc_inode = efs_alloc_inode,
1da177e4 LT	117	.destroy_inode = efs_destroy_inode,
1da177e4 LT	118	.put_super = efs_put_super,
	119	.statfs = efs_statfs,
	120	.remount_fs = efs_remount,
	121	};
	122
39655164	123	static const struct export_operations efs_export_ops = {
05da0804 CH	124	.fh_to_dentry = efs_fh_to_dentry,
05da0804 CH	125	.fh_to_parent = efs_fh_to_parent,
1da177e4 LT	126	.get_parent = efs_get_parent,
	127	};
	128
	129	static int __init init_efs_fs(void) {
	130	int err;
	131	printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
	132	err = init_inodecache();
	133	if (err)
	134	goto out1;
	135	err = register_filesystem(&efs_fs_type);
	136	if (err)
	137	goto out;
	138	return 0;
	139	out:
	140	destroy_inodecache();
	141	out1:
	142	return err;
	143	}
	144
	145	static void __exit exit_efs_fs(void) {
	146	unregister_filesystem(&efs_fs_type);
	147	destroy_inodecache();
	148	}
	149
	150	module_init(init_efs_fs)
	151	module_exit(exit_efs_fs)
	152
	153	static efs_block_t efs_validate_vh(struct volume_header *vh) {
	154	int i;
	155	__be32 cs, *ui;
	156	int csum;
	157	efs_block_t sblock = 0; /* shuts up gcc */
	158	struct pt_types *pt_entry;
	159	int pt_type, slice = -1;
	160
	161	if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
	162	/*
	163	* assume that we're dealing with a partition and allow
	164	* read_super() to try and detect a valid superblock
	165	* on the next block.
	166	*/
	167	return 0;
	168	}
	169
	170	ui = ((__be32 *) (vh + 1)) - 1;
	171	for(csum = 0; ui >= ((__be32 *) vh);) {
	172	cs = *ui--;
	173	csum += be32_to_cpu(cs);
	174	}
	175	if (csum) {
	176	printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n");
	177	return 0;
	178	}
	179
	180	#ifdef DEBUG
	181	printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile);
	182
	183	for(i = 0; i < NVDIR; i++) {
	184	int j;
	185	char name[VDNAMESIZE+1];
	186
	187	for(j = 0; j < VDNAMESIZE; j++) {
	188	name[j] = vh->vh_vd[i].vd_name[j];
	189	}
190	name[j] = (char) 0;
191
192	if (name[0]) {
193	printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n",
194	name,
195	(int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
196	(int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
197	}
198	}
199	#endif
200
201	for(i = 0; i < NPARTAB; i++) {
202	pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
203	for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
204	if (pt_type == pt_entry->pt_type) break;
205	}
206	#ifdef DEBUG
207	if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
208	printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
209	i,
210	(int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
211	(int) be32_to_cpu(vh->vh_pt[i].pt_nblks),
212	pt_type,
213	(pt_entry->pt_name) ? pt_entry->pt_name : "unknown");
214	}
215	#endif
216	if (IS_EFS(pt_type)) {
217	sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
218	slice = i;
219	}
220	}
221
222	if (slice == -1) {
223	printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n");
224	#ifdef DEBUG
225	} else {
226	printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n",
227	slice,
228	(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
229	sblock);
230	#endif
231	}
014c2544	232	return sblock;
1da177e4 LT	233	}
	234
	235	static int efs_validate_super(struct efs_sb_info sb, struct efs_super super) {
	236
014c2544 JJ	237	if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
014c2544 JJ	238	return -1;
1da177e4 LT	239
	240	sb->fs_magic = be32_to_cpu(super->fs_magic);
	241	sb->total_blocks = be32_to_cpu(super->fs_size);
	242	sb->first_block = be32_to_cpu(super->fs_firstcg);
	243	sb->group_size = be32_to_cpu(super->fs_cgfsize);
	244	sb->data_free = be32_to_cpu(super->fs_tfree);
	245	sb->inode_free = be32_to_cpu(super->fs_tinode);
	246	sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
	247	sb->total_groups = be16_to_cpu(super->fs_ncg);
	248
	249	return 0;
	250	}
	251
	252	static int efs_fill_super(struct super_block s, void d, int silent)
	253	{
	254	struct efs_sb_info *sb;
	255	struct buffer_head *bh;
	256	struct inode *root;
298384cd	257	int ret = -EINVAL;
1da177e4	258
f8314dc6	259	sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
1da177e4 LT	260	if (!sb)
	261	return -ENOMEM;
	262	s->s_fs_info = sb;
1da177e4 LT	263
	264	s->s_magic = EFS_SUPER_MAGIC;
	265	if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
	266	printk(KERN_ERR "EFS: device does not support %d byte blocks\n",
	267	EFS_BLOCKSIZE);
	268	goto out_no_fs_ul;
	269	}
	270
	271	/* read the vh (volume header) block */
	272	bh = sb_bread(s, 0);
	273
	274	if (!bh) {
	275	printk(KERN_ERR "EFS: cannot read volume header\n");
	276	goto out_no_fs_ul;
	277	}
	278
	279	/*
	280	* if this returns zero then we didn't find any partition table.
	281	* this isn't (yet) an error - just assume for the moment that
	282	* the device is valid and go on to search for a superblock.
	283	*/
	284	sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
	285	brelse(bh);
	286
	287	if (sb->fs_start == -1) {
	288	goto out_no_fs_ul;
	289	}
	290
	291	bh = sb_bread(s, sb->fs_start + EFS_SUPER);
	292	if (!bh) {
	293	printk(KERN_ERR "EFS: cannot read superblock\n");
	294	goto out_no_fs_ul;
	295	}
	296
	297	if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
	298	#ifdef DEBUG
	299	printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER);
	300	#endif
	301	brelse(bh);
	302	goto out_no_fs_ul;
	303	}
	304	brelse(bh);
	305
	306	if (!(s->s_flags & MS_RDONLY)) {
	307	#ifdef DEBUG
	308	printk(KERN_INFO "EFS: forcing read-only mode\n");
	309	#endif
	310	s->s_flags \|= MS_RDONLY;
	311	}
	312	s->s_op = &efs_superblock_operations;
	313	s->s_export_op = &efs_export_ops;
298384cd DH	314	root = efs_iget(s, EFS_ROOTINODE);
	315	if (IS_ERR(root)) {
	316	printk(KERN_ERR "EFS: get root inode failed\n");
	317	ret = PTR_ERR(root);
	318	goto out_no_fs;
	319	}
	320
1da177e4	321	s->s_root = d_alloc_root(root);
1da177e4	322	if (!(s->s_root)) {
298384cd	323	printk(KERN_ERR "EFS: get root dentry failed\n");
1da177e4	324	iput(root);
298384cd	325	ret = -ENOMEM;
1da177e4 LT	326	goto out_no_fs;
	327	}
	328
	329	return 0;
	330
	331	out_no_fs_ul:
	332	out_no_fs:
	333	s->s_fs_info = NULL;
	334	kfree(sb);
298384cd	335	return ret;
1da177e4 LT	336	}
1da177e4 LT	337
726c3342	338	static int efs_statfs(struct dentry dentry, struct kstatfs buf) {
514c91a9 CL	339	struct super_block *sb = dentry->d_sb;
	340	struct efs_sb_info *sbi = SUPER_INFO(sb);
	341	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	342
	343	buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
	344	buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
514c91a9 CL	345	buf->f_blocks = sbi->total_groups * /* total data blocks */
	346	(sbi->group_size - sbi->inode_blocks);
	347	buf->f_bfree = sbi->data_free; /* free data blocks */
	348	buf->f_bavail = sbi->data_free; /* free blocks for non-root */
	349	buf->f_files = sbi->total_groups * /* total inodes */
	350	sbi->inode_blocks *
1da177e4	351	(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
514c91a9 CL	352	buf->f_ffree = sbi->inode_free; /* free inodes */
	353	buf->f_fsid.val[0] = (u32)id;
	354	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	355	buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */
	356
	357	return 0;
	358	}
	359