[people/ms/linux.git] / fs / btrfs / dir-item.c

/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include "ctree.h"
#include "disk-io.h"
#include "hash.h"
#include "transaction.h"

static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle
						   *trans,
						   struct btrfs_root *root,
						   struct btrfs_path *path,
						   struct btrfs_key *cpu_key,
						   u32 data_size,
						   const char *name,
						   int name_len)
{
	int ret;
	char *ptr;
	struct btrfs_item *item;
	struct extent_buffer *leaf;

	ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
	if (ret == -EEXIST) {
		struct btrfs_dir_item *di;
		di = btrfs_match_dir_item_name(root, path, name, name_len);
		if (di)
			return ERR_PTR(-EEXIST);
		ret = btrfs_extend_item(trans, root, path, data_size);
		WARN_ON(ret > 0);
	}
	if (ret < 0)
		return ERR_PTR(ret);
	WARN_ON(ret > 0);
	leaf = path->nodes[0];
	item = btrfs_item_nr(leaf, path->slots[0]);
	ptr = btrfs_item_ptr(leaf, path->slots[0], char);
	BUG_ON(data_size > btrfs_item_size(leaf, item));
	ptr += btrfs_item_size(leaf, item) - data_size;
	return (struct btrfs_dir_item *)ptr;
}

int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root, const char *name,
			    u16 name_len, const void *data, u16 data_len,
			    u64 dir)
{
	int ret = 0;
	struct btrfs_path *path;
	struct btrfs_dir_item *dir_item;
	unsigned long name_ptr, data_ptr;
	struct btrfs_key key, location;
	struct btrfs_disk_key disk_key;
	struct extent_buffer *leaf;
	u32 data_size;

	key.objectid = dir;
	btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
	key.offset = btrfs_name_hash(name, name_len);
	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;
	if (name_len + data_len + sizeof(struct btrfs_dir_item) >
	    BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item))
		return -ENOSPC;

	data_size = sizeof(*dir_item) + name_len + data_len;
	dir_item = insert_with_overflow(trans, root, path, &key, data_size,
					name, name_len);
	/*
	 * FIXME: at some point we should handle xattr's that are larger than
	 * what we can fit in our leaf.  We set location to NULL b/c we arent
	 * pointing at anything else, that will change if we store the xattr
	 * data in a separate inode.
	 */
	BUG_ON(IS_ERR(dir_item));
	memset(&location, 0, sizeof(location));

	leaf = path->nodes[0];
	btrfs_cpu_key_to_disk(&disk_key, &location);
	btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
	btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR);
	btrfs_set_dir_name_len(leaf, dir_item, name_len);
	btrfs_set_dir_transid(leaf, dir_item, trans->transid);
	btrfs_set_dir_data_len(leaf, dir_item, data_len);
	name_ptr = (unsigned long)(dir_item + 1);
	data_ptr = (unsigned long)((char *)name_ptr + name_len);

	write_extent_buffer(leaf, name, name_ptr, name_len);
	write_extent_buffer(leaf, data, data_ptr, data_len);
	btrfs_mark_buffer_dirty(path->nodes[0]);

	btrfs_free_path(path);
	return ret;
}

int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
			  *root, const char *name, int name_len, u64 dir,
			  struct btrfs_key *location, u8 type, u64 index)
{
	int ret = 0;
	int ret2 = 0;
	struct btrfs_path *path;
	struct btrfs_dir_item *dir_item;
	struct extent_buffer *leaf;
	unsigned long name_ptr;
	struct btrfs_key key;
	struct btrfs_disk_key disk_key;
	u32 data_size;

	key.objectid = dir;
	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
	key.offset = btrfs_name_hash(name, name_len);
	path = btrfs_alloc_path();
	data_size = sizeof(*dir_item) + name_len;
	dir_item = insert_with_overflow(trans, root, path, &key, data_size,
					name, name_len);
	if (IS_ERR(dir_item)) {
		ret = PTR_ERR(dir_item);
		if (ret == -EEXIST)
			goto second_insert;
		goto out;
	}

	leaf = path->nodes[0];
	btrfs_cpu_key_to_disk(&disk_key, location);
	btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
	btrfs_set_dir_type(leaf, dir_item, type);
	btrfs_set_dir_data_len(leaf, dir_item, 0);
	btrfs_set_dir_name_len(leaf, dir_item, name_len);
	btrfs_set_dir_transid(leaf, dir_item, trans->transid);
	name_ptr = (unsigned long)(dir_item + 1);

	write_extent_buffer(leaf, name, name_ptr, name_len);
	btrfs_mark_buffer_dirty(leaf);

second_insert:
	/* FIXME, use some real flag for selecting the extra index */
	if (root == root->fs_info->tree_root) {
		ret = 0;
		goto out;
	}
	btrfs_release_path(root, path);

	btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
	key.offset = index;
	dir_item = insert_with_overflow(trans, root, path, &key, data_size,
					name, name_len);
	if (IS_ERR(dir_item)) {
		ret2 = PTR_ERR(dir_item);
		goto out;
	}
	leaf = path->nodes[0];
	btrfs_cpu_key_to_disk(&disk_key, location);
	btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
	btrfs_set_dir_type(leaf, dir_item, type);
	btrfs_set_dir_data_len(leaf, dir_item, 0);
	btrfs_set_dir_name_len(leaf, dir_item, name_len);
	btrfs_set_dir_transid(leaf, dir_item, trans->transid);
	name_ptr = (unsigned long)(dir_item + 1);
	write_extent_buffer(leaf, name, name_ptr, name_len);
	btrfs_mark_buffer_dirty(leaf);
out:
	btrfs_free_path(path);
	if (ret)
		return ret;
	if (ret2)
		return ret2;
	return 0;
}

struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
					     struct btrfs_root *root,
					     struct btrfs_path *path, u64 dir,
					     const char *name, int name_len,
					     int mod)
{
	int ret;
	struct btrfs_key key;
	int ins_len = mod < 0 ? -1 : 0;
	int cow = mod != 0;
	struct btrfs_key found_key;
	struct extent_buffer *leaf;

	key.objectid = dir;
	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);

	key.offset = btrfs_name_hash(name, name_len);

	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
	if (ret < 0)
		return ERR_PTR(ret);
	if (ret > 0) {
		if (path->slots[0] == 0)
			return NULL;
		path->slots[0]--;
	}

	leaf = path->nodes[0];
	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);

	if (found_key.objectid != dir ||
	    btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY ||
	    found_key.offset != key.offset)
		return NULL;

	return btrfs_match_dir_item_name(root, path, name, name_len);
}

struct btrfs_dir_item *
btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root,
			    struct btrfs_path *path, u64 dir,
			    u64 objectid, const char *name, int name_len,
			    int mod)
{
	int ret;
	struct btrfs_key key;
	int ins_len = mod < 0 ? -1 : 0;
	int cow = mod != 0;

	key.objectid = dir;
	btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
	key.offset = objectid;

	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
	if (ret < 0)
		return ERR_PTR(ret);
	if (ret > 0)
		return ERR_PTR(-ENOENT);
	return btrfs_match_dir_item_name(root, path, name, name_len);
}

struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
					  struct btrfs_root *root,
					  struct btrfs_path *path, u64 dir,
					  const char *name, u16 name_len,
					  int mod)
{
	int ret;
	struct btrfs_key key;
	int ins_len = mod < 0 ? -1 : 0;
	int cow = mod != 0;
	struct btrfs_key found_key;
	struct extent_buffer *leaf;

	key.objectid = dir;
	btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
	key.offset = btrfs_name_hash(name, name_len);
	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
	if (ret < 0)
		return ERR_PTR(ret);
	if (ret > 0) {
		if (path->slots[0] == 0)
			return NULL;
		path->slots[0]--;
	}

	leaf = path->nodes[0];
	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);

	if (found_key.objectid != dir ||
	    btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY ||
	    found_key.offset != key.offset)
		return NULL;

	return btrfs_match_dir_item_name(root, path, name, name_len);
}

struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
			      struct btrfs_path *path,
			      const char *name, int name_len)
{
	struct btrfs_dir_item *dir_item;
	unsigned long name_ptr;
	u32 total_len;
	u32 cur = 0;
	u32 this_len;
	struct extent_buffer *leaf;

	leaf = path->nodes[0];
	dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
	total_len = btrfs_item_size_nr(leaf, path->slots[0]);
	while(cur < total_len) {
		this_len = sizeof(*dir_item) +
			btrfs_dir_name_len(leaf, dir_item) +
			btrfs_dir_data_len(leaf, dir_item);
		name_ptr = (unsigned long)(dir_item + 1);

		if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
		    memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
			return dir_item;

		cur += this_len;
		dir_item = (struct btrfs_dir_item *)((char *)dir_item +
						     this_len);
	}
	return NULL;
}

int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
			      struct btrfs_root *root,
			      struct btrfs_path *path,
			      struct btrfs_dir_item *di)
{

	struct extent_buffer *leaf;
	u32 sub_item_len;
	u32 item_len;
	int ret = 0;

	leaf = path->nodes[0];
	sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) +
		btrfs_dir_data_len(leaf, di);
	item_len = btrfs_item_size_nr(leaf, path->slots[0]);
	if (sub_item_len == item_len) {
		ret = btrfs_del_item(trans, root, path);
	} else {
		/* MARKER */
		unsigned long ptr = (unsigned long)di;
		unsigned long start;

		start = btrfs_item_ptr_offset(leaf, path->slots[0]);
		memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
			item_len - (ptr + sub_item_len - start));
		ret = btrfs_truncate_item(trans, root, path,
					  item_len - sub_item_len, 1);
	}
	return 0;
}
Commit	Line	Data
6cbd5570 CM	1	/*
	2	* Copyright (C) 2007 Oracle. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public
	6	* License v2 as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public
	14	* License along with this program; if not, write to the
	15	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	16	* Boston, MA 021110-1307, USA.
	17	*/
	18
62e2749e CM	19	#include "ctree.h"
	20	#include "disk-io.h"
	21	#include "hash.h"
e089f05c	22	#include "transaction.h"
62e2749e	23
35b7e476 CM	24	static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle
	25	*trans,
	26	struct btrfs_root *root,
	27	struct btrfs_path *path,
	28	struct btrfs_key *cpu_key,
e06afa83 CM	29	u32 data_size,
	30	const char *name,
	31	int name_len)
7fcde0e3	32	{
7fcde0e3	33	int ret;
7e38180e CM	34	char *ptr;
7e38180e CM	35	struct btrfs_item *item;
5f39d397	36	struct extent_buffer *leaf;
7fcde0e3 CM	37
7fcde0e3 CM	38	ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
7e38180e	39	if (ret == -EEXIST) {
e06afa83 CM	40	struct btrfs_dir_item *di;
	41	di = btrfs_match_dir_item_name(root, path, name, name_len);
	42	if (di)
	43	return ERR_PTR(-EEXIST);
7e38180e CM	44	ret = btrfs_extend_item(trans, root, path, data_size);
7e38180e CM	45	WARN_ON(ret > 0);
7fcde0e3	46	}
54aa1f4d CM	47	if (ret < 0)
54aa1f4d CM	48	return ERR_PTR(ret);
7e38180e	49	WARN_ON(ret > 0);
5f39d397 CM	50	leaf = path->nodes[0];
5f39d397 CM	51	item = btrfs_item_nr(leaf, path->slots[0]);
7e38180e	52	ptr = btrfs_item_ptr(leaf, path->slots[0], char);
5f39d397 CM	53	BUG_ON(data_size > btrfs_item_size(leaf, item));
5f39d397 CM	54	ptr += btrfs_item_size(leaf, item) - data_size;
7e38180e	55	return (struct btrfs_dir_item *)ptr;
7fcde0e3 CM	56	}
7fcde0e3 CM	57
5103e947 JB	58	int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
	59	struct btrfs_root root, const char name,
	60	u16 name_len, const void *data, u16 data_len,
	61	u64 dir)
	62	{
	63	int ret = 0;
	64	struct btrfs_path *path;
	65	struct btrfs_dir_item *dir_item;
	66	unsigned long name_ptr, data_ptr;
	67	struct btrfs_key key, location;
	68	struct btrfs_disk_key disk_key;
	69	struct extent_buffer *leaf;
	70	u32 data_size;
	71
	72	key.objectid = dir;
	73	btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
df68b8a7	74	key.offset = btrfs_name_hash(name, name_len);
5103e947 JB	75	path = btrfs_alloc_path();
	76	if (!path)
	77	return -ENOMEM;
744f52f9 Y	78	if (name_len + data_len + sizeof(struct btrfs_dir_item) >
	79	BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item))
	80	return -ENOSPC;
5103e947 JB	81
	82	data_size = sizeof(*dir_item) + name_len + data_len;
	83	dir_item = insert_with_overflow(trans, root, path, &key, data_size,
	84	name, name_len);
	85	/*
	86	* FIXME: at some point we should handle xattr's that are larger than
	87	* what we can fit in our leaf. We set location to NULL b/c we arent
	88	* pointing at anything else, that will change if we store the xattr
	89	* data in a separate inode.
	90	*/
	91	BUG_ON(IS_ERR(dir_item));
	92	memset(&location, 0, sizeof(location));
	93
	94	leaf = path->nodes[0];
	95	btrfs_cpu_key_to_disk(&disk_key, &location);
	96	btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
	97	btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR);
	98	btrfs_set_dir_name_len(leaf, dir_item, name_len);
e02119d5	99	btrfs_set_dir_transid(leaf, dir_item, trans->transid);
5103e947 JB	100	btrfs_set_dir_data_len(leaf, dir_item, data_len);
	101	name_ptr = (unsigned long)(dir_item + 1);
	102	data_ptr = (unsigned long)((char *)name_ptr + name_len);
	103
	104	write_extent_buffer(leaf, name, name_ptr, name_len);
	105	write_extent_buffer(leaf, data, data_ptr, data_len);
	106	btrfs_mark_buffer_dirty(path->nodes[0]);
	107
	108	btrfs_free_path(path);
	109	return ret;
	110	}
	111
e089f05c	112	int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
d6e4a428	113	root, const char name, int name_len, u64 dir,
aec7477b	114	struct btrfs_key *location, u8 type, u64 index)
62e2749e CM	115	{
62e2749e CM	116	int ret = 0;
e06afa83	117	int ret2 = 0;
5caf2a00	118	struct btrfs_path *path;
62e2749e	119	struct btrfs_dir_item *dir_item;
5f39d397 CM	120	struct extent_buffer *leaf;
5f39d397 CM	121	unsigned long name_ptr;
62e2749e	122	struct btrfs_key key;
5f39d397	123	struct btrfs_disk_key disk_key;
62e2749e CM	124	u32 data_size;
	125
	126	key.objectid = dir;
1d4f6404	127	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
df68b8a7	128	key.offset = btrfs_name_hash(name, name_len);
5caf2a00	129	path = btrfs_alloc_path();
62e2749e	130	data_size = sizeof(*dir_item) + name_len;
e06afa83 CM	131	dir_item = insert_with_overflow(trans, root, path, &key, data_size,
e06afa83 CM	132	name, name_len);
7e38180e CM	133	if (IS_ERR(dir_item)) {
7e38180e CM	134	ret = PTR_ERR(dir_item);
e06afa83 CM	135	if (ret == -EEXIST)
e06afa83 CM	136	goto second_insert;
62e2749e	137	goto out;
7e38180e	138	}
62e2749e	139
5f39d397 CM	140	leaf = path->nodes[0];
	141	btrfs_cpu_key_to_disk(&disk_key, location);
	142	btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
	143	btrfs_set_dir_type(leaf, dir_item, type);
5103e947	144	btrfs_set_dir_data_len(leaf, dir_item, 0);
5f39d397	145	btrfs_set_dir_name_len(leaf, dir_item, name_len);
e02119d5	146	btrfs_set_dir_transid(leaf, dir_item, trans->transid);
5f39d397	147	name_ptr = (unsigned long)(dir_item + 1);
c5739bba	148
5f39d397 CM	149	write_extent_buffer(leaf, name, name_ptr, name_len);
5f39d397 CM	150	btrfs_mark_buffer_dirty(leaf);
7e38180e	151
e06afa83	152	second_insert:
7e38180e CM	153	/* FIXME, use some real flag for selecting the extra index */
	154	if (root == root->fs_info->tree_root) {
	155	ret = 0;
	156	goto out;
	157	}
5caf2a00	158	btrfs_release_path(root, path);
7e38180e CM	159
7e38180e CM	160	btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
aec7477b	161	key.offset = index;
e06afa83 CM	162	dir_item = insert_with_overflow(trans, root, path, &key, data_size,
e06afa83 CM	163	name, name_len);
7e38180e	164	if (IS_ERR(dir_item)) {
e06afa83	165	ret2 = PTR_ERR(dir_item);
7e38180e CM	166	goto out;
7e38180e CM	167	}
5f39d397 CM	168	leaf = path->nodes[0];
	169	btrfs_cpu_key_to_disk(&disk_key, location);
	170	btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
	171	btrfs_set_dir_type(leaf, dir_item, type);
5103e947	172	btrfs_set_dir_data_len(leaf, dir_item, 0);
5f39d397	173	btrfs_set_dir_name_len(leaf, dir_item, name_len);
e02119d5	174	btrfs_set_dir_transid(leaf, dir_item, trans->transid);
5f39d397 CM	175	name_ptr = (unsigned long)(dir_item + 1);
	176	write_extent_buffer(leaf, name, name_ptr, name_len);
	177	btrfs_mark_buffer_dirty(leaf);
7e38180e	178	out:
5caf2a00	179	btrfs_free_path(path);
e06afa83 CM	180	if (ret)
	181	return ret;
	182	if (ret2)
	183	return ret2;
	184	return 0;
62e2749e CM	185	}
62e2749e CM	186
7e38180e CM	187	struct btrfs_dir_item btrfs_lookup_dir_item(struct btrfs_trans_handle trans,
	188	struct btrfs_root *root,
	189	struct btrfs_path *path, u64 dir,
	190	const char *name, int name_len,
	191	int mod)
62e2749e	192	{
1d4f6404	193	int ret;
62e2749e	194	struct btrfs_key key;
1d4f6404 CM	195	int ins_len = mod < 0 ? -1 : 0;
1d4f6404 CM	196	int cow = mod != 0;
5f39d397 CM	197	struct btrfs_key found_key;
5f39d397 CM	198	struct extent_buffer *leaf;
62e2749e CM	199
62e2749e CM	200	key.objectid = dir;
1d4f6404	201	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
5f39d397	202
df68b8a7	203	key.offset = btrfs_name_hash(name, name_len);
5f39d397	204
7e38180e CM	205	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
	206	if (ret < 0)
	207	return ERR_PTR(ret);
	208	if (ret > 0) {
	209	if (path->slots[0] == 0)
	210	return NULL;
	211	path->slots[0]--;
7fcde0e3	212	}
7e38180e	213
5f39d397 CM	214	leaf = path->nodes[0];
	215	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
	216
	217	if (found_key.objectid != dir \|\|
	218	btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY \|\|
	219	found_key.offset != key.offset)
7e38180e CM	220	return NULL;
	221
	222	return btrfs_match_dir_item_name(root, path, name, name_len);
62e2749e CM	223	}
62e2749e CM	224
7e38180e CM	225	struct btrfs_dir_item *
	226	btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
	227	struct btrfs_root *root,
	228	struct btrfs_path *path, u64 dir,
	229	u64 objectid, const char *name, int name_len,
	230	int mod)
	231	{
	232	int ret;
	233	struct btrfs_key key;
	234	int ins_len = mod < 0 ? -1 : 0;
	235	int cow = mod != 0;
	236
	237	key.objectid = dir;
7e38180e CM	238	btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
	239	key.offset = objectid;
	240
	241	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
	242	if (ret < 0)
	243	return ERR_PTR(ret);
	244	if (ret > 0)
	245	return ERR_PTR(-ENOENT);
	246	return btrfs_match_dir_item_name(root, path, name, name_len);
	247	}
	248
5103e947 JB	249	struct btrfs_dir_item btrfs_lookup_xattr(struct btrfs_trans_handle trans,
	250	struct btrfs_root *root,
	251	struct btrfs_path *path, u64 dir,
	252	const char *name, u16 name_len,
	253	int mod)
	254	{
	255	int ret;
	256	struct btrfs_key key;
	257	int ins_len = mod < 0 ? -1 : 0;
	258	int cow = mod != 0;
	259	struct btrfs_key found_key;
	260	struct extent_buffer *leaf;
	261
	262	key.objectid = dir;
	263	btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
df68b8a7	264	key.offset = btrfs_name_hash(name, name_len);
5103e947 JB	265	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
	266	if (ret < 0)
	267	return ERR_PTR(ret);
	268	if (ret > 0) {
	269	if (path->slots[0] == 0)
	270	return NULL;
	271	path->slots[0]--;
	272	}
	273
	274	leaf = path->nodes[0];
	275	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
	276
	277	if (found_key.objectid != dir \|\|
	278	btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY \|\|
	279	found_key.offset != key.offset)
	280	return NULL;
	281
	282	return btrfs_match_dir_item_name(root, path, name, name_len);
	283	}
	284
7e38180e	285	struct btrfs_dir_item btrfs_match_dir_item_name(struct btrfs_root root,
7f5c1516 CM	286	struct btrfs_path *path,
7f5c1516 CM	287	const char *name, int name_len)
62e2749e	288	{
62e2749e	289	struct btrfs_dir_item *dir_item;
5f39d397	290	unsigned long name_ptr;
7e38180e CM	291	u32 total_len;
	292	u32 cur = 0;
	293	u32 this_len;
5f39d397	294	struct extent_buffer *leaf;
a8a2ee0c	295
5f39d397	296	leaf = path->nodes[0];
7e38180e	297	dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
5f39d397	298	total_len = btrfs_item_size_nr(leaf, path->slots[0]);
7e38180e	299	while(cur < total_len) {
5f39d397	300	this_len = sizeof(*dir_item) +
5103e947 JB	301	btrfs_dir_name_len(leaf, dir_item) +
5103e947 JB	302	btrfs_dir_data_len(leaf, dir_item);
5f39d397	303	name_ptr = (unsigned long)(dir_item + 1);
7e38180e	304
5f39d397 CM	305	if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
5f39d397 CM	306	memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
7e38180e CM	307	return dir_item;
	308
	309	cur += this_len;
	310	dir_item = (struct btrfs_dir_item )((char )dir_item +
	311	this_len);
	312	}
	313	return NULL;
62e2749e	314	}
7e38180e CM	315
	316	int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
	317	struct btrfs_root *root,
	318	struct btrfs_path *path,
	319	struct btrfs_dir_item *di)
	320	{
	321
5f39d397	322	struct extent_buffer *leaf;
7e38180e CM	323	u32 sub_item_len;
7e38180e CM	324	u32 item_len;
54aa1f4d	325	int ret = 0;
7e38180e	326
5f39d397	327	leaf = path->nodes[0];
5103e947 JB	328	sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) +
5103e947 JB	329	btrfs_dir_data_len(leaf, di);
5f39d397 CM	330	item_len = btrfs_item_size_nr(leaf, path->slots[0]);
5f39d397 CM	331	if (sub_item_len == item_len) {
7e38180e	332	ret = btrfs_del_item(trans, root, path);
7e38180e	333	} else {
5f39d397 CM	334	/* MARKER */
	335	unsigned long ptr = (unsigned long)di;
	336	unsigned long start;
	337
	338	start = btrfs_item_ptr_offset(leaf, path->slots[0]);
	339	memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
7e38180e CM	340	item_len - (ptr + sub_item_len - start));
7e38180e CM	341	ret = btrfs_truncate_item(trans, root, path,
179e29e4	342	item_len - sub_item_len, 1);
7e38180e CM	343	}
	344	return 0;
	345	}