[mirror_ubuntu-zesty-kernel.git] / fs / btrfs / export.c

#include <linux/fs.h>
#include <linux/types.h>
#include "ctree.h"
#include "disk-io.h"
#include "btrfs_inode.h"
#include "print-tree.h"
#include "export.h"

#define BTRFS_FID_SIZE_NON_CONNECTABLE (offsetof(struct btrfs_fid, \
						 parent_objectid) / 4)
#define BTRFS_FID_SIZE_CONNECTABLE (offsetof(struct btrfs_fid, \
					     parent_root_objectid) / 4)
#define BTRFS_FID_SIZE_CONNECTABLE_ROOT (sizeof(struct btrfs_fid) / 4)

static int btrfs_encode_fh(struct inode *inode, u32 *fh, int *max_len,
			   struct inode *parent)
{
	struct btrfs_fid *fid = (struct btrfs_fid *)fh;
	int len = *max_len;
	int type;

	if (parent && (len < BTRFS_FID_SIZE_CONNECTABLE)) {
		*max_len = BTRFS_FID_SIZE_CONNECTABLE;
		return FILEID_INVALID;
	} else if (len < BTRFS_FID_SIZE_NON_CONNECTABLE) {
		*max_len = BTRFS_FID_SIZE_NON_CONNECTABLE;
		return FILEID_INVALID;
	}

	len  = BTRFS_FID_SIZE_NON_CONNECTABLE;
	type = FILEID_BTRFS_WITHOUT_PARENT;

	fid->objectid = btrfs_ino(inode);
	fid->root_objectid = BTRFS_I(inode)->root->objectid;
	fid->gen = inode->i_generation;

	if (parent) {
		u64 parent_root_id;

		fid->parent_objectid = BTRFS_I(parent)->location.objectid;
		fid->parent_gen = parent->i_generation;
		parent_root_id = BTRFS_I(parent)->root->objectid;

		if (parent_root_id != fid->root_objectid) {
			fid->parent_root_objectid = parent_root_id;
			len = BTRFS_FID_SIZE_CONNECTABLE_ROOT;
			type = FILEID_BTRFS_WITH_PARENT_ROOT;
		} else {
			len = BTRFS_FID_SIZE_CONNECTABLE;
			type = FILEID_BTRFS_WITH_PARENT;
		}
	}

	*max_len = len;
	return type;
}

static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
				       u64 root_objectid, u32 generation,
				       int check_generation)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
	struct btrfs_root *root;
	struct inode *inode;
	struct btrfs_key key;
	int index;
	int err = 0;

	if (objectid < BTRFS_FIRST_FREE_OBJECTID)
		return ERR_PTR(-ESTALE);

	key.objectid = root_objectid;
	key.type = BTRFS_ROOT_ITEM_KEY;
	key.offset = (u64)-1;

	index = srcu_read_lock(&fs_info->subvol_srcu);

	root = btrfs_read_fs_root_no_name(fs_info, &key);
	if (IS_ERR(root)) {
		err = PTR_ERR(root);
		goto fail;
	}

	key.objectid = objectid;
	key.type = BTRFS_INODE_ITEM_KEY;
	key.offset = 0;

	inode = btrfs_iget(sb, &key, root, NULL);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		goto fail;
	}

	srcu_read_unlock(&fs_info->subvol_srcu, index);

	if (check_generation && generation != inode->i_generation) {
		iput(inode);
		return ERR_PTR(-ESTALE);
	}

	return d_obtain_alias(inode);
fail:
	srcu_read_unlock(&fs_info->subvol_srcu, index);
	return ERR_PTR(err);
}

static struct dentry *btrfs_fh_to_parent(struct super_block *sb, struct fid *fh,
					 int fh_len, int fh_type)
{
	struct btrfs_fid *fid = (struct btrfs_fid *) fh;
	u64 objectid, root_objectid;
	u32 generation;

	if (fh_type == FILEID_BTRFS_WITH_PARENT) {
		if (fh_len <  BTRFS_FID_SIZE_CONNECTABLE)
			return NULL;
		root_objectid = fid->root_objectid;
	} else if (fh_type == FILEID_BTRFS_WITH_PARENT_ROOT) {
		if (fh_len < BTRFS_FID_SIZE_CONNECTABLE_ROOT)
			return NULL;
		root_objectid = fid->parent_root_objectid;
	} else
		return NULL;

	objectid = fid->parent_objectid;
	generation = fid->parent_gen;

	return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
}

static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
					 int fh_len, int fh_type)
{
	struct btrfs_fid *fid = (struct btrfs_fid *) fh;
	u64 objectid, root_objectid;
	u32 generation;

	if ((fh_type != FILEID_BTRFS_WITH_PARENT ||
	     fh_len < BTRFS_FID_SIZE_CONNECTABLE) &&
	    (fh_type != FILEID_BTRFS_WITH_PARENT_ROOT ||
	     fh_len < BTRFS_FID_SIZE_CONNECTABLE_ROOT) &&
	    (fh_type != FILEID_BTRFS_WITHOUT_PARENT ||
	     fh_len < BTRFS_FID_SIZE_NON_CONNECTABLE))
		return NULL;

	objectid = fid->objectid;
	root_objectid = fid->root_objectid;
	generation = fid->gen;

	return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
}

static struct dentry *btrfs_get_parent(struct dentry *child)
{
	struct inode *dir = d_inode(child);
	struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
	struct btrfs_root *root = BTRFS_I(dir)->root;
	struct btrfs_path *path;
	struct extent_buffer *leaf;
	struct btrfs_root_ref *ref;
	struct btrfs_key key;
	struct btrfs_key found_key;
	int ret;

	path = btrfs_alloc_path();
	if (!path)
		return ERR_PTR(-ENOMEM);

	if (btrfs_ino(dir) == BTRFS_FIRST_FREE_OBJECTID) {
		key.objectid = root->root_key.objectid;
		key.type = BTRFS_ROOT_BACKREF_KEY;
		key.offset = (u64)-1;
		root = fs_info->tree_root;
	} else {
		key.objectid = btrfs_ino(dir);
		key.type = BTRFS_INODE_REF_KEY;
		key.offset = (u64)-1;
	}

	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
	if (ret < 0)
		goto fail;

	BUG_ON(ret == 0); /* Key with offset of -1 found */
	if (path->slots[0] == 0) {
		ret = -ENOENT;
		goto fail;
	}

	path->slots[0]--;
	leaf = path->nodes[0];

	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
	if (found_key.objectid != key.objectid || found_key.type != key.type) {
		ret = -ENOENT;
		goto fail;
	}

	if (found_key.type == BTRFS_ROOT_BACKREF_KEY) {
		ref = btrfs_item_ptr(leaf, path->slots[0],
				     struct btrfs_root_ref);
		key.objectid = btrfs_root_ref_dirid(leaf, ref);
	} else {
		key.objectid = found_key.offset;
	}
	btrfs_free_path(path);

	if (found_key.type == BTRFS_ROOT_BACKREF_KEY) {
		return btrfs_get_dentry(fs_info->sb, key.objectid,
					found_key.offset, 0, 0);
	}

	key.type = BTRFS_INODE_ITEM_KEY;
	key.offset = 0;
	return d_obtain_alias(btrfs_iget(fs_info->sb, &key, root, NULL));
fail:
	btrfs_free_path(path);
	return ERR_PTR(ret);
}

static int btrfs_get_name(struct dentry *parent, char *name,
			  struct dentry *child)
{
	struct inode *inode = d_inode(child);
	struct inode *dir = d_inode(parent);
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	struct btrfs_path *path;
	struct btrfs_root *root = BTRFS_I(dir)->root;
	struct btrfs_inode_ref *iref;
	struct btrfs_root_ref *rref;
	struct extent_buffer *leaf;
	unsigned long name_ptr;
	struct btrfs_key key;
	int name_len;
	int ret;
	u64 ino;

	if (!dir || !inode)
		return -EINVAL;

	if (!S_ISDIR(dir->i_mode))
		return -EINVAL;

	ino = btrfs_ino(inode);

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;
	path->leave_spinning = 1;

	if (ino == BTRFS_FIRST_FREE_OBJECTID) {
		key.objectid = BTRFS_I(inode)->root->root_key.objectid;
		key.type = BTRFS_ROOT_BACKREF_KEY;
		key.offset = (u64)-1;
		root = fs_info->tree_root;
	} else {
		key.objectid = ino;
		key.offset = btrfs_ino(dir);
		key.type = BTRFS_INODE_REF_KEY;
	}

	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
	if (ret < 0) {
		btrfs_free_path(path);
		return ret;
	} else if (ret > 0) {
		if (ino == BTRFS_FIRST_FREE_OBJECTID) {
			path->slots[0]--;
		} else {
			btrfs_free_path(path);
			return -ENOENT;
		}
	}
	leaf = path->nodes[0];

	if (ino == BTRFS_FIRST_FREE_OBJECTID) {
		rref = btrfs_item_ptr(leaf, path->slots[0],
				     struct btrfs_root_ref);
		name_ptr = (unsigned long)(rref + 1);
		name_len = btrfs_root_ref_name_len(leaf, rref);
	} else {
		iref = btrfs_item_ptr(leaf, path->slots[0],
				      struct btrfs_inode_ref);
		name_ptr = (unsigned long)(iref + 1);
		name_len = btrfs_inode_ref_name_len(leaf, iref);
	}

	read_extent_buffer(leaf, name, name_ptr, name_len);
	btrfs_free_path(path);

	/*
	 * have to add the null termination to make sure that reconnect_path
	 * gets the right len for strlen
	 */
	name[name_len] = '\0';

	return 0;
}

const struct export_operations btrfs_export_ops = {
	.encode_fh	= btrfs_encode_fh,
	.fh_to_dentry	= btrfs_fh_to_dentry,
	.fh_to_parent	= btrfs_fh_to_parent,
	.get_parent	= btrfs_get_parent,
	.get_name	= btrfs_get_name,
};
Commit	Line	Data
be6e8dc0 BR	1	#include <linux/fs.h>
	2	#include <linux/types.h>
	3	#include "ctree.h"
	4	#include "disk-io.h"
	5	#include "btrfs_inode.h"
	6	#include "print-tree.h"
	7	#include "export.h"
be6e8dc0	8
d397712b CM	9	#define BTRFS_FID_SIZE_NON_CONNECTABLE (offsetof(struct btrfs_fid, \
	10	parent_objectid) / 4)
	11	#define BTRFS_FID_SIZE_CONNECTABLE (offsetof(struct btrfs_fid, \
	12	parent_root_objectid) / 4)
	13	#define BTRFS_FID_SIZE_CONNECTABLE_ROOT (sizeof(struct btrfs_fid) / 4)
be6e8dc0	14
b0b0382b AV	15	static int btrfs_encode_fh(struct inode inode, u32 fh, int *max_len,
b0b0382b AV	16	struct inode *parent)
be6e8dc0 BR	17	{
be6e8dc0 BR	18	struct btrfs_fid fid = (struct btrfs_fid )fh;
be6e8dc0 BR	19	int len = *max_len;
	20	int type;
	21
b0b0382b	22	if (parent && (len < BTRFS_FID_SIZE_CONNECTABLE)) {
5fe0c237	23	*max_len = BTRFS_FID_SIZE_CONNECTABLE;
94e07a75	24	return FILEID_INVALID;
5fe0c237 AK	25	} else if (len < BTRFS_FID_SIZE_NON_CONNECTABLE) {
5fe0c237 AK	26	*max_len = BTRFS_FID_SIZE_NON_CONNECTABLE;
94e07a75	27	return FILEID_INVALID;
5fe0c237	28	}
be6e8dc0 BR	29
	30	len = BTRFS_FID_SIZE_NON_CONNECTABLE;
	31	type = FILEID_BTRFS_WITHOUT_PARENT;
	32
33345d01	33	fid->objectid = btrfs_ino(inode);
be6e8dc0 BR	34	fid->root_objectid = BTRFS_I(inode)->root->objectid;
	35	fid->gen = inode->i_generation;
	36
b0b0382b	37	if (parent) {
be6e8dc0 BR	38	u64 parent_root_id;
be6e8dc0 BR	39
be6e8dc0 BR	40	fid->parent_objectid = BTRFS_I(parent)->location.objectid;
	41	fid->parent_gen = parent->i_generation;
	42	parent_root_id = BTRFS_I(parent)->root->objectid;
	43
be6e8dc0 BR	44	if (parent_root_id != fid->root_objectid) {
	45	fid->parent_root_objectid = parent_root_id;
	46	len = BTRFS_FID_SIZE_CONNECTABLE_ROOT;
	47	type = FILEID_BTRFS_WITH_PARENT_ROOT;
	48	} else {
	49	len = BTRFS_FID_SIZE_CONNECTABLE;
	50	type = FILEID_BTRFS_WITH_PARENT;
	51	}
	52	}
	53
	54	*max_len = len;
	55	return type;
	56	}
	57
	58	static struct dentry btrfs_get_dentry(struct super_block sb, u64 objectid,
76dda93c YZ	59	u64 root_objectid, u32 generation,
76dda93c YZ	60	int check_generation)
be6e8dc0	61	{
815745cf	62	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
be6e8dc0 BR	63	struct btrfs_root *root;
be6e8dc0 BR	64	struct inode *inode;
be6e8dc0	65	struct btrfs_key key;
76dda93c YZ	66	int index;
	67	int err = 0;
	68
	69	if (objectid < BTRFS_FIRST_FREE_OBJECTID)
	70	return ERR_PTR(-ESTALE);
be6e8dc0	71
2d4d9fbd	72	key.objectid = root_objectid;
962a298f	73	key.type = BTRFS_ROOT_ITEM_KEY;
2d4d9fbd DW	74	key.offset = (u64)-1;
2d4d9fbd DW	75
76dda93c YZ	76	index = srcu_read_lock(&fs_info->subvol_srcu);
	77
	78	root = btrfs_read_fs_root_no_name(fs_info, &key);
	79	if (IS_ERR(root)) {
	80	err = PTR_ERR(root);
	81	goto fail;
	82	}
	83
be6e8dc0	84	key.objectid = objectid;
962a298f	85	key.type = BTRFS_INODE_ITEM_KEY;
be6e8dc0 BR	86	key.offset = 0;
be6e8dc0 BR	87
73f73415	88	inode = btrfs_iget(sb, &key, root, NULL);
76dda93c YZ	89	if (IS_ERR(inode)) {
	90	err = PTR_ERR(inode);
	91	goto fail;
	92	}
	93
	94	srcu_read_unlock(&fs_info->subvol_srcu, index);
be6e8dc0	95
76dda93c	96	if (check_generation && generation != inode->i_generation) {
be6e8dc0 BR	97	iput(inode);
	98	return ERR_PTR(-ESTALE);
	99	}
	100
af53d29a	101	return d_obtain_alias(inode);
76dda93c YZ	102	fail:
	103	srcu_read_unlock(&fs_info->subvol_srcu, index);
	104	return ERR_PTR(err);
be6e8dc0 BR	105	}
	106
	107	static struct dentry btrfs_fh_to_parent(struct super_block sb, struct fid *fh,
	108	int fh_len, int fh_type)
	109	{
	110	struct btrfs_fid fid = (struct btrfs_fid ) fh;
	111	u64 objectid, root_objectid;
	112	u32 generation;
	113
	114	if (fh_type == FILEID_BTRFS_WITH_PARENT) {
7d35199e	115	if (fh_len < BTRFS_FID_SIZE_CONNECTABLE)
be6e8dc0 BR	116	return NULL;
	117	root_objectid = fid->root_objectid;
	118	} else if (fh_type == FILEID_BTRFS_WITH_PARENT_ROOT) {
7d35199e	119	if (fh_len < BTRFS_FID_SIZE_CONNECTABLE_ROOT)
be6e8dc0 BR	120	return NULL;
	121	root_objectid = fid->parent_root_objectid;
	122	} else
	123	return NULL;
	124
	125	objectid = fid->parent_objectid;
	126	generation = fid->parent_gen;
	127
76dda93c	128	return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
be6e8dc0 BR	129	}
	130
	131	static struct dentry btrfs_fh_to_dentry(struct super_block sb, struct fid *fh,
	132	int fh_len, int fh_type)
	133	{
	134	struct btrfs_fid fid = (struct btrfs_fid ) fh;
	135	u64 objectid, root_objectid;
	136	u32 generation;
	137
	138	if ((fh_type != FILEID_BTRFS_WITH_PARENT \|\|
7d35199e	139	fh_len < BTRFS_FID_SIZE_CONNECTABLE) &&
be6e8dc0	140	(fh_type != FILEID_BTRFS_WITH_PARENT_ROOT \|\|
7d35199e	141	fh_len < BTRFS_FID_SIZE_CONNECTABLE_ROOT) &&
be6e8dc0	142	(fh_type != FILEID_BTRFS_WITHOUT_PARENT \|\|
7d35199e	143	fh_len < BTRFS_FID_SIZE_NON_CONNECTABLE))
be6e8dc0 BR	144	return NULL;
	145
	146	objectid = fid->objectid;
	147	root_objectid = fid->root_objectid;
	148	generation = fid->gen;
	149
76dda93c	150	return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
be6e8dc0 BR	151	}
	152
	153	static struct dentry btrfs_get_parent(struct dentry child)
	154	{
2b0143b5	155	struct inode *dir = d_inode(child);
0b246afa	156	struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
be6e8dc0	157	struct btrfs_root *root = BTRFS_I(dir)->root;
be6e8dc0 BR	158	struct btrfs_path *path;
be6e8dc0 BR	159	struct extent_buffer *leaf;
76dda93c YZ	160	struct btrfs_root_ref *ref;
	161	struct btrfs_key key;
	162	struct btrfs_key found_key;
be6e8dc0 BR	163	int ret;
	164
	165	path = btrfs_alloc_path();
2a29edc6	166	if (!path)
2a29edc6	167	return ERR_PTR(-ENOMEM);
be6e8dc0	168
33345d01	169	if (btrfs_ino(dir) == BTRFS_FIRST_FREE_OBJECTID) {
76dda93c YZ	170	key.objectid = root->root_key.objectid;
	171	key.type = BTRFS_ROOT_BACKREF_KEY;
	172	key.offset = (u64)-1;
0b246afa	173	root = fs_info->tree_root;
76dda93c	174	} else {
33345d01	175	key.objectid = btrfs_ino(dir);
76dda93c YZ	176	key.type = BTRFS_INODE_REF_KEY;
	177	key.offset = (u64)-1;
	178	}
be6e8dc0	179
87acb4ef	180	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
76dda93c YZ	181	if (ret < 0)
	182	goto fail;
	183
79787eaa	184	BUG_ON(ret == 0); /* Key with offset of -1 found */
76dda93c YZ	185	if (path->slots[0] == 0) {
	186	ret = -ENOENT;
	187	goto fail;
d54a8390	188	}
76dda93c YZ	189
76dda93c YZ	190	path->slots[0]--;
be6e8dc0	191	leaf = path->nodes[0];
76dda93c YZ	192
	193	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
	194	if (found_key.objectid != key.objectid \|\| found_key.type != key.type) {
	195	ret = -ENOENT;
	196	goto fail;
be6e8dc0 BR	197	}
be6e8dc0 BR	198
76dda93c YZ	199	if (found_key.type == BTRFS_ROOT_BACKREF_KEY) {
	200	ref = btrfs_item_ptr(leaf, path->slots[0],
	201	struct btrfs_root_ref);
	202	key.objectid = btrfs_root_ref_dirid(leaf, ref);
	203	} else {
	204	key.objectid = found_key.offset;
	205	}
be6e8dc0 BR	206	btrfs_free_path(path);
be6e8dc0 BR	207
76dda93c	208	if (found_key.type == BTRFS_ROOT_BACKREF_KEY) {
0b246afa	209	return btrfs_get_dentry(fs_info->sb, key.objectid,
76dda93c YZ	210	found_key.offset, 0, 0);
76dda93c YZ	211	}
2d4d9fbd	212
76dda93c	213	key.type = BTRFS_INODE_ITEM_KEY;
be6e8dc0	214	key.offset = 0;
0b246afa	215	return d_obtain_alias(btrfs_iget(fs_info->sb, &key, root, NULL));
76dda93c YZ	216	fail:
	217	btrfs_free_path(path);
	218	return ERR_PTR(ret);
be6e8dc0 BR	219	}
be6e8dc0 BR	220
2ede0daf JB	221	static int btrfs_get_name(struct dentry parent, char name,
	222	struct dentry *child)
	223	{
2b0143b5 DH	224	struct inode *inode = d_inode(child);
2b0143b5 DH	225	struct inode *dir = d_inode(parent);
0b246afa	226	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2ede0daf JB	227	struct btrfs_path *path;
	228	struct btrfs_root *root = BTRFS_I(dir)->root;
	229	struct btrfs_inode_ref *iref;
	230	struct btrfs_root_ref *rref;
	231	struct extent_buffer *leaf;
	232	unsigned long name_ptr;
	233	struct btrfs_key key;
	234	int name_len;
	235	int ret;
33345d01	236	u64 ino;
2ede0daf JB	237
	238	if (!dir \|\| !inode)
	239	return -EINVAL;
	240
	241	if (!S_ISDIR(dir->i_mode))
	242	return -EINVAL;
	243
33345d01 LZ	244	ino = btrfs_ino(inode);
33345d01 LZ	245
2ede0daf JB	246	path = btrfs_alloc_path();
	247	if (!path)
	248	return -ENOMEM;
	249	path->leave_spinning = 1;
	250
33345d01	251	if (ino == BTRFS_FIRST_FREE_OBJECTID) {
2ede0daf JB	252	key.objectid = BTRFS_I(inode)->root->root_key.objectid;
	253	key.type = BTRFS_ROOT_BACKREF_KEY;
	254	key.offset = (u64)-1;
0b246afa	255	root = fs_info->tree_root;
2ede0daf	256	} else {
33345d01 LZ	257	key.objectid = ino;
33345d01 LZ	258	key.offset = btrfs_ino(dir);
2ede0daf JB	259	key.type = BTRFS_INODE_REF_KEY;
	260	}
	261
	262	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
	263	if (ret < 0) {
	264	btrfs_free_path(path);
	265	return ret;
	266	} else if (ret > 0) {
33345d01	267	if (ino == BTRFS_FIRST_FREE_OBJECTID) {
2ede0daf JB	268	path->slots[0]--;
	269	} else {
	270	btrfs_free_path(path);
	271	return -ENOENT;
	272	}
	273	}
	274	leaf = path->nodes[0];
	275
33345d01 LZ	276	if (ino == BTRFS_FIRST_FREE_OBJECTID) {
33345d01 LZ	277	rref = btrfs_item_ptr(leaf, path->slots[0],
2ede0daf	278	struct btrfs_root_ref);
33345d01 LZ	279	name_ptr = (unsigned long)(rref + 1);
33345d01 LZ	280	name_len = btrfs_root_ref_name_len(leaf, rref);
2ede0daf JB	281	} else {
	282	iref = btrfs_item_ptr(leaf, path->slots[0],
	283	struct btrfs_inode_ref);
	284	name_ptr = (unsigned long)(iref + 1);
	285	name_len = btrfs_inode_ref_name_len(leaf, iref);
	286	}
	287
	288	read_extent_buffer(leaf, name, name_ptr, name_len);
	289	btrfs_free_path(path);
	290
	291	/*
	292	* have to add the null termination to make sure that reconnect_path
	293	* gets the right len for strlen
	294	*/
	295	name[name_len] = '\0';
	296
	297	return 0;
	298	}
	299
be6e8dc0 BR	300	const struct export_operations btrfs_export_ops = {
	301	.encode_fh = btrfs_encode_fh,
	302	.fh_to_dentry = btrfs_fh_to_dentry,
	303	.fh_to_parent = btrfs_fh_to_parent,
	304	.get_parent = btrfs_get_parent,
2ede0daf	305	.get_name = btrfs_get_name,
be6e8dc0	306	};