[linux-block.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_free_inode(struct inode *inode)
{
	kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
}

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,
	.free_inode	= efs_free_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
f415c511	77	static void efs_free_inode(struct inode *inode)
1da177e4 LT	78	{
	79	kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
	80	}
	81
51cc5068	82	static void init_once(void *foo)
1da177e4 LT	83	{
	84	struct efs_inode_info ei = (struct efs_inode_info ) foo;
	85
a35afb83	86	inode_init_once(&ei->vfs_inode);
1da177e4	87	}
20c2df83	88
7a42d4b6	89	static int __init init_inodecache(void)
1da177e4 LT	90	{
1da177e4 LT	91	efs_inode_cachep = kmem_cache_create("efs_inode_cache",
5d097056 VD	92	sizeof(struct efs_inode_info), 0,
	93	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD\|
	94	SLAB_ACCOUNT, init_once);
1da177e4 LT	95	if (efs_inode_cachep == NULL)
	96	return -ENOMEM;
	97	return 0;
	98	}
	99
	100	static void destroy_inodecache(void)
	101	{
8c0a8537 KS	102	/*
	103	* Make sure all delayed rcu free inodes are flushed before we
	104	* destroy cache.
	105	*/
	106	rcu_barrier();
1a1d92c1	107	kmem_cache_destroy(efs_inode_cachep);
1da177e4 LT	108	}
1da177e4 LT	109
1da177e4 LT	110	static int efs_remount(struct super_block sb, int flags, char *data)
1da177e4 LT	111	{
02b9984d	112	sync_filesystem(sb);
1751e8a6	113	*flags \|= SB_RDONLY;
1da177e4 LT	114	return 0;
	115	}
	116
ee9b6d61	117	static const struct super_operations efs_superblock_operations = {
1da177e4	118	.alloc_inode = efs_alloc_inode,
f415c511	119	.free_inode = efs_free_inode,
1da177e4 LT	120	.statfs = efs_statfs,
	121	.remount_fs = efs_remount,
	122	};
	123
39655164	124	static const struct export_operations efs_export_ops = {
05da0804 CH	125	.fh_to_dentry = efs_fh_to_dentry,
05da0804 CH	126	.fh_to_parent = efs_fh_to_parent,
1da177e4 LT	127	.get_parent = efs_get_parent,
	128	};
	129
	130	static int __init init_efs_fs(void) {
	131	int err;
f403d1db	132	pr_info(EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
1da177e4 LT	133	err = init_inodecache();
	134	if (err)
	135	goto out1;
	136	err = register_filesystem(&efs_fs_type);
	137	if (err)
	138	goto out;
	139	return 0;
	140	out:
	141	destroy_inodecache();
	142	out1:
	143	return err;
	144	}
	145
	146	static void __exit exit_efs_fs(void) {
	147	unregister_filesystem(&efs_fs_type);
	148	destroy_inodecache();
	149	}
	150
	151	module_init(init_efs_fs)
	152	module_exit(exit_efs_fs)
	153
	154	static efs_block_t efs_validate_vh(struct volume_header *vh) {
	155	int i;
	156	__be32 cs, *ui;
	157	int csum;
	158	efs_block_t sblock = 0; /* shuts up gcc */
	159	struct pt_types *pt_entry;
	160	int pt_type, slice = -1;
	161
	162	if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
	163	/*
	164	* assume that we're dealing with a partition and allow
	165	* read_super() to try and detect a valid superblock
	166	* on the next block.
	167	*/
	168	return 0;
	169	}
	170
	171	ui = ((__be32 *) (vh + 1)) - 1;
	172	for(csum = 0; ui >= ((__be32 *) vh);) {
	173	cs = *ui--;
	174	csum += be32_to_cpu(cs);
	175	}
	176	if (csum) {
f403d1db	177	pr_warn("SGI disklabel: checksum bad, label corrupted\n");
1da177e4 LT	178	return 0;
	179	}
	180
	181	#ifdef DEBUG
d1826f2a	182	pr_debug("bf: \"%16s\"\n", vh->vh_bootfile);
1da177e4 LT	183
	184	for(i = 0; i < NVDIR; i++) {
	185	int j;
	186	char name[VDNAMESIZE+1];
	187
	188	for(j = 0; j < VDNAMESIZE; j++) {
	189	name[j] = vh->vh_vd[i].vd_name[j];
	190	}
	191	name[j] = (char) 0;
	192
	193	if (name[0]) {
d1826f2a FF	194	pr_debug("vh: %8s block: 0x%08x size: 0x%08x\n",
d1826f2a FF	195	name, (int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
1da177e4 LT	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)) {
d1826f2a FF	208	pr_debug("pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
	209	i, (int)be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
	210	(int)be32_to_cpu(vh->vh_pt[i].pt_nblks),
	211	pt_type, (pt_entry->pt_name) ?
	212	pt_entry->pt_name : "unknown");
1da177e4 LT	213	}
	214	#endif
	215	if (IS_EFS(pt_type)) {
	216	sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
	217	slice = i;
	218	}
	219	}
	220
	221	if (slice == -1) {
f403d1db	222	pr_notice("partition table contained no EFS partitions\n");
1da177e4 LT	223	#ifdef DEBUG
1da177e4 LT	224	} else {
f403d1db	225	pr_info("using slice %d (type %s, offset 0x%x)\n", slice,
1da177e4 LT	226	(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
	227	sblock);
	228	#endif
	229	}
014c2544	230	return sblock;
1da177e4 LT	231	}
	232
	233	static int efs_validate_super(struct efs_sb_info sb, struct efs_super super) {
	234
014c2544 JJ	235	if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
014c2544 JJ	236	return -1;
1da177e4 LT	237
	238	sb->fs_magic = be32_to_cpu(super->fs_magic);
	239	sb->total_blocks = be32_to_cpu(super->fs_size);
	240	sb->first_block = be32_to_cpu(super->fs_firstcg);
	241	sb->group_size = be32_to_cpu(super->fs_cgfsize);
	242	sb->data_free = be32_to_cpu(super->fs_tfree);
	243	sb->inode_free = be32_to_cpu(super->fs_tinode);
	244	sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
	245	sb->total_groups = be16_to_cpu(super->fs_ncg);
	246
	247	return 0;
	248	}
	249
	250	static int efs_fill_super(struct super_block s, void d, int silent)
	251	{
	252	struct efs_sb_info *sb;
	253	struct buffer_head *bh;
	254	struct inode *root;
	255
f8314dc6	256	sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
1da177e4 LT	257	if (!sb)
	258	return -ENOMEM;
	259	s->s_fs_info = sb;
1da177e4 LT	260
	261	s->s_magic = EFS_SUPER_MAGIC;
	262	if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
f403d1db	263	pr_err("device does not support %d byte blocks\n",
1da177e4	264	EFS_BLOCKSIZE);
5a9ed6f5	265	return -EINVAL;
1da177e4 LT	266	}
	267
	268	/* read the vh (volume header) block */
	269	bh = sb_bread(s, 0);
	270
	271	if (!bh) {
f403d1db	272	pr_err("cannot read volume header\n");
4108124f	273	return -EIO;
1da177e4 LT	274	}
	275
	276	/*
	277	* if this returns zero then we didn't find any partition table.
	278	* this isn't (yet) an error - just assume for the moment that
	279	* the device is valid and go on to search for a superblock.
	280	*/
	281	sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
	282	brelse(bh);
	283
	284	if (sb->fs_start == -1) {
5a9ed6f5	285	return -EINVAL;
1da177e4 LT	286	}
	287
	288	bh = sb_bread(s, sb->fs_start + EFS_SUPER);
	289	if (!bh) {
f403d1db	290	pr_err("cannot read superblock\n");
4108124f	291	return -EIO;
1da177e4 LT	292	}
	293
	294	if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
	295	#ifdef DEBUG
f403d1db FF	296	pr_warn("invalid superblock at block %u\n",
f403d1db FF	297	sb->fs_start + EFS_SUPER);
1da177e4 LT	298	#endif
1da177e4 LT	299	brelse(bh);
5a9ed6f5	300	return -EINVAL;
1da177e4 LT	301	}
	302	brelse(bh);
	303
bc98a42c	304	if (!sb_rdonly(s)) {
1da177e4	305	#ifdef DEBUG
f403d1db	306	pr_info("forcing read-only mode\n");
1da177e4	307	#endif
1751e8a6	308	s->s_flags \|= SB_RDONLY;
1da177e4 LT	309	}
	310	s->s_op = &efs_superblock_operations;
	311	s->s_export_op = &efs_export_ops;
298384cd DH	312	root = efs_iget(s, EFS_ROOTINODE);
298384cd DH	313	if (IS_ERR(root)) {
f403d1db	314	pr_err("get root inode failed\n");
5a9ed6f5	315	return PTR_ERR(root);
298384cd DH	316	}
298384cd DH	317
48fde701	318	s->s_root = d_make_root(root);
1da177e4	319	if (!(s->s_root)) {
f403d1db	320	pr_err("get root dentry failed\n");
5a9ed6f5	321	return -ENOMEM;
1da177e4 LT	322	}
	323
	324	return 0;
1da177e4 LT	325	}
1da177e4 LT	326
726c3342	327	static int efs_statfs(struct dentry dentry, struct kstatfs buf) {
514c91a9 CL	328	struct super_block *sb = dentry->d_sb;
	329	struct efs_sb_info *sbi = SUPER_INFO(sb);
	330	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	331
	332	buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
	333	buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
514c91a9 CL	334	buf->f_blocks = sbi->total_groups * /* total data blocks */
	335	(sbi->group_size - sbi->inode_blocks);
	336	buf->f_bfree = sbi->data_free; /* free data blocks */
	337	buf->f_bavail = sbi->data_free; /* free blocks for non-root */
	338	buf->f_files = sbi->total_groups * /* total inodes */
	339	sbi->inode_blocks *
1da177e4	340	(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
514c91a9 CL	341	buf->f_ffree = sbi->inode_free; /* free inodes */
	342	buf->f_fsid.val[0] = (u32)id;
	343	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	344	buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */
	345
	346	return 0;
	347	}
	348