[linux.git] / fs / efs / super.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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 void efs_kill_sb(struct super_block *s)
{
	struct efs_sb_info *sbi = SUPER_INFO(s);
	kill_block_super(s);
	kfree(sbi);
}

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;
}

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));
}

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 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;
}

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);
}

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

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;
}

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) {
		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;
}

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;

 	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 (!sb_rdonly(s)) {
#ifdef DEBUG
		pr_info("forcing read-only mode\n");
#endif
		s->s_flags |= SB_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;
}

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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* super.c
	4	*
	5	* Copyright (c) 1999 Al Smith
	6	*
	7	* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
	8	*/
	9
	10	#include <linux/init.h>
	11	#include <linux/module.h>
a5694255	12	#include <linux/exportfs.h>
1da177e4 LT	13	#include <linux/slab.h>
	14	#include <linux/buffer_head.h>
	15	#include <linux/vfs.h>
	16
45254b4f CH	17	#include "efs.h"
	18	#include <linux/efs_vh.h>
	19	#include <linux/efs_fs_sb.h>
	20
726c3342	21	static int efs_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4 LT	22	static int efs_fill_super(struct super_block s, void d, int silent);
1da177e4 LT	23
152a0836 AV	24	static struct dentry efs_mount(struct file_system_type fs_type,
152a0836 AV	25	int flags, const char dev_name, void data)
1da177e4	26	{
152a0836	27	return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super);
1da177e4 LT	28	}
1da177e4 LT	29
5a9ed6f5 AV	30	static void efs_kill_sb(struct super_block *s)
	31	{
	32	struct efs_sb_info *sbi = SUPER_INFO(s);
	33	kill_block_super(s);
	34	kfree(sbi);
	35	}
	36
1da177e4 LT	37	static struct file_system_type efs_fs_type = {
	38	.owner = THIS_MODULE,
	39	.name = "efs",
152a0836	40	.mount = efs_mount,
5a9ed6f5	41	.kill_sb = efs_kill_sb,
1da177e4 LT	42	.fs_flags = FS_REQUIRES_DEV,
1da177e4 LT	43	};
7f78e035	44	MODULE_ALIAS_FS("efs");
1da177e4 LT	45
	46	static struct pt_types sgi_pt_types[] = {
	47	{0x00, "SGI vh"},
	48	{0x01, "SGI trkrepl"},
	49	{0x02, "SGI secrepl"},
	50	{0x03, "SGI raw"},
	51	{0x04, "SGI bsd"},
	52	{SGI_SYSV, "SGI sysv"},
	53	{0x06, "SGI vol"},
	54	{SGI_EFS, "SGI efs"},
	55	{0x08, "SGI lv"},
	56	{0x09, "SGI rlv"},
	57	{0x0A, "SGI xfs"},
	58	{0x0B, "SGI xfslog"},
	59	{0x0C, "SGI xlv"},
	60	{0x82, "Linux swap"},
	61	{0x83, "Linux native"},
	62	{0, NULL}
	63	};
	64
	65
e18b890b	66	static struct kmem_cache * efs_inode_cachep;
1da177e4 LT	67
	68	static struct inode efs_alloc_inode(struct super_block sb)
	69	{
	70	struct efs_inode_info *ei;
35a4c902	71	ei = kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
1da177e4 LT	72	if (!ei)
	73	return NULL;
	74	return &ei->vfs_inode;
	75	}
	76
fa0d7e3d	77	static void efs_i_callback(struct rcu_head *head)
1da177e4	78	{
fa0d7e3d	79	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	80	kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
	81	}
	82
fa0d7e3d NP	83	static void efs_destroy_inode(struct inode *inode)
	84	{
	85	call_rcu(&inode->i_rcu, efs_i_callback);
	86	}
	87
51cc5068	88	static void init_once(void *foo)
1da177e4 LT	89	{
	90	struct efs_inode_info ei = (struct efs_inode_info ) foo;
	91
a35afb83	92	inode_init_once(&ei->vfs_inode);
1da177e4	93	}
20c2df83	94
7a42d4b6	95	static int __init init_inodecache(void)
1da177e4 LT	96	{
1da177e4 LT	97	efs_inode_cachep = kmem_cache_create("efs_inode_cache",
5d097056 VD	98	sizeof(struct efs_inode_info), 0,
	99	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD\|
	100	SLAB_ACCOUNT, init_once);
1da177e4 LT	101	if (efs_inode_cachep == NULL)
	102	return -ENOMEM;
	103	return 0;
	104	}
	105
	106	static void destroy_inodecache(void)
	107	{
8c0a8537 KS	108	/*
	109	* Make sure all delayed rcu free inodes are flushed before we
	110	* destroy cache.
	111	*/
	112	rcu_barrier();
1a1d92c1	113	kmem_cache_destroy(efs_inode_cachep);
1da177e4 LT	114	}
1da177e4 LT	115
1da177e4 LT	116	static int efs_remount(struct super_block sb, int flags, char *data)
1da177e4 LT	117	{
02b9984d	118	sync_filesystem(sb);
1751e8a6	119	*flags \|= SB_RDONLY;
1da177e4 LT	120	return 0;
	121	}
	122
ee9b6d61	123	static const struct super_operations efs_superblock_operations = {
1da177e4 LT	124	.alloc_inode = efs_alloc_inode,
1da177e4 LT	125	.destroy_inode = efs_destroy_inode,
1da177e4 LT	126	.statfs = efs_statfs,
	127	.remount_fs = efs_remount,
	128	};
	129
39655164	130	static const struct export_operations efs_export_ops = {
05da0804 CH	131	.fh_to_dentry = efs_fh_to_dentry,
05da0804 CH	132	.fh_to_parent = efs_fh_to_parent,
1da177e4 LT	133	.get_parent = efs_get_parent,
	134	};
	135
	136	static int __init init_efs_fs(void) {
	137	int err;
f403d1db	138	pr_info(EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
1da177e4 LT	139	err = init_inodecache();
	140	if (err)
	141	goto out1;
	142	err = register_filesystem(&efs_fs_type);
	143	if (err)
	144	goto out;
	145	return 0;
	146	out:
	147	destroy_inodecache();
	148	out1:
	149	return err;
	150	}
	151
	152	static void __exit exit_efs_fs(void) {
	153	unregister_filesystem(&efs_fs_type);
	154	destroy_inodecache();
	155	}
	156
	157	module_init(init_efs_fs)
	158	module_exit(exit_efs_fs)
	159
	160	static efs_block_t efs_validate_vh(struct volume_header *vh) {
	161	int i;
	162	__be32 cs, *ui;
	163	int csum;
	164	efs_block_t sblock = 0; /* shuts up gcc */
	165	struct pt_types *pt_entry;
	166	int pt_type, slice = -1;
	167
	168	if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
	169	/*
	170	* assume that we're dealing with a partition and allow
	171	* read_super() to try and detect a valid superblock
	172	* on the next block.
	173	*/
	174	return 0;
	175	}
	176
	177	ui = ((__be32 *) (vh + 1)) - 1;
	178	for(csum = 0; ui >= ((__be32 *) vh);) {
	179	cs = *ui--;
	180	csum += be32_to_cpu(cs);
	181	}
	182	if (csum) {
f403d1db	183	pr_warn("SGI disklabel: checksum bad, label corrupted\n");
1da177e4 LT	184	return 0;
	185	}
	186
	187	#ifdef DEBUG
d1826f2a	188	pr_debug("bf: \"%16s\"\n", vh->vh_bootfile);
1da177e4 LT	189
	190	for(i = 0; i < NVDIR; i++) {
	191	int j;
	192	char name[VDNAMESIZE+1];
	193
	194	for(j = 0; j < VDNAMESIZE; j++) {
	195	name[j] = vh->vh_vd[i].vd_name[j];
	196	}
	197	name[j] = (char) 0;
	198
	199	if (name[0]) {
d1826f2a FF	200	pr_debug("vh: %8s block: 0x%08x size: 0x%08x\n",
d1826f2a FF	201	name, (int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
1da177e4 LT	202	(int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
	203	}
	204	}
	205	#endif
	206
	207	for(i = 0; i < NPARTAB; i++) {
	208	pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
	209	for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
	210	if (pt_type == pt_entry->pt_type) break;
	211	}
	212	#ifdef DEBUG
	213	if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
d1826f2a FF	214	pr_debug("pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
	215	i, (int)be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
	216	(int)be32_to_cpu(vh->vh_pt[i].pt_nblks),
	217	pt_type, (pt_entry->pt_name) ?
	218	pt_entry->pt_name : "unknown");
1da177e4 LT	219	}
	220	#endif
	221	if (IS_EFS(pt_type)) {
	222	sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
	223	slice = i;
	224	}
	225	}
	226
	227	if (slice == -1) {
f403d1db	228	pr_notice("partition table contained no EFS partitions\n");
1da177e4 LT	229	#ifdef DEBUG
1da177e4 LT	230	} else {
f403d1db	231	pr_info("using slice %d (type %s, offset 0x%x)\n", slice,
1da177e4 LT	232	(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
	233	sblock);
	234	#endif
	235	}
014c2544	236	return sblock;
1da177e4 LT	237	}
	238
	239	static int efs_validate_super(struct efs_sb_info sb, struct efs_super super) {
	240
014c2544 JJ	241	if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
014c2544 JJ	242	return -1;
1da177e4 LT	243
	244	sb->fs_magic = be32_to_cpu(super->fs_magic);
	245	sb->total_blocks = be32_to_cpu(super->fs_size);
	246	sb->first_block = be32_to_cpu(super->fs_firstcg);
	247	sb->group_size = be32_to_cpu(super->fs_cgfsize);
	248	sb->data_free = be32_to_cpu(super->fs_tfree);
	249	sb->inode_free = be32_to_cpu(super->fs_tinode);
	250	sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
	251	sb->total_groups = be16_to_cpu(super->fs_ncg);
	252
	253	return 0;
	254	}
	255
	256	static int efs_fill_super(struct super_block s, void d, int silent)
	257	{
	258	struct efs_sb_info *sb;
	259	struct buffer_head *bh;
	260	struct inode *root;
	261
f8314dc6	262	sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
1da177e4 LT	263	if (!sb)
	264	return -ENOMEM;
	265	s->s_fs_info = sb;
1da177e4 LT	266
	267	s->s_magic = EFS_SUPER_MAGIC;
	268	if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
f403d1db	269	pr_err("device does not support %d byte blocks\n",
1da177e4	270	EFS_BLOCKSIZE);
5a9ed6f5	271	return -EINVAL;
1da177e4 LT	272	}
	273
	274	/* read the vh (volume header) block */
	275	bh = sb_bread(s, 0);
	276
	277	if (!bh) {
f403d1db	278	pr_err("cannot read volume header\n");
4108124f	279	return -EIO;
1da177e4 LT	280	}
	281
	282	/*
	283	* if this returns zero then we didn't find any partition table.
	284	* this isn't (yet) an error - just assume for the moment that
	285	* the device is valid and go on to search for a superblock.
	286	*/
	287	sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
	288	brelse(bh);
	289
	290	if (sb->fs_start == -1) {
5a9ed6f5	291	return -EINVAL;
1da177e4 LT	292	}
	293
	294	bh = sb_bread(s, sb->fs_start + EFS_SUPER);
	295	if (!bh) {
f403d1db	296	pr_err("cannot read superblock\n");
4108124f	297	return -EIO;
1da177e4 LT	298	}
	299
	300	if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
	301	#ifdef DEBUG
f403d1db FF	302	pr_warn("invalid superblock at block %u\n",
f403d1db FF	303	sb->fs_start + EFS_SUPER);
1da177e4 LT	304	#endif
1da177e4 LT	305	brelse(bh);
5a9ed6f5	306	return -EINVAL;
1da177e4 LT	307	}
	308	brelse(bh);
	309
bc98a42c	310	if (!sb_rdonly(s)) {
1da177e4	311	#ifdef DEBUG
f403d1db	312	pr_info("forcing read-only mode\n");
1da177e4	313	#endif
1751e8a6	314	s->s_flags \|= SB_RDONLY;
1da177e4 LT	315	}
	316	s->s_op = &efs_superblock_operations;
	317	s->s_export_op = &efs_export_ops;
298384cd DH	318	root = efs_iget(s, EFS_ROOTINODE);
298384cd DH	319	if (IS_ERR(root)) {
f403d1db	320	pr_err("get root inode failed\n");
5a9ed6f5	321	return PTR_ERR(root);
298384cd DH	322	}
298384cd DH	323
48fde701	324	s->s_root = d_make_root(root);
1da177e4	325	if (!(s->s_root)) {
f403d1db	326	pr_err("get root dentry failed\n");
5a9ed6f5	327	return -ENOMEM;
1da177e4 LT	328	}
	329
	330	return 0;
1da177e4 LT	331	}
1da177e4 LT	332
726c3342	333	static int efs_statfs(struct dentry dentry, struct kstatfs buf) {
514c91a9 CL	334	struct super_block *sb = dentry->d_sb;
	335	struct efs_sb_info *sbi = SUPER_INFO(sb);
	336	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	337
	338	buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
	339	buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
514c91a9 CL	340	buf->f_blocks = sbi->total_groups * /* total data blocks */
	341	(sbi->group_size - sbi->inode_blocks);
	342	buf->f_bfree = sbi->data_free; /* free data blocks */
	343	buf->f_bavail = sbi->data_free; /* free blocks for non-root */
	344	buf->f_files = sbi->total_groups * /* total inodes */
	345	sbi->inode_blocks *
1da177e4	346	(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
514c91a9 CL	347	buf->f_ffree = sbi->inode_free; /* free inodes */
	348	buf->f_fsid.val[0] = (u32)id;
	349	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	350	buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */
	351
	352	return 0;
	353	}
	354