mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
344 lines
9.6 KiB
C
344 lines
9.6 KiB
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);
|
|
ret = btrfs_name_hash(name, name_len, &key.offset);
|
|
BUG_ON(ret);
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
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_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)
|
|
{
|
|
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);
|
|
ret = btrfs_name_hash(name, name_len, &key.offset);
|
|
BUG_ON(ret);
|
|
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);
|
|
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 = location->objectid;
|
|
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);
|
|
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);
|
|
|
|
ret = btrfs_name_hash(name, name_len, &key.offset);
|
|
BUG_ON(ret);
|
|
|
|
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);
|
|
ret = btrfs_name_hash(name, name_len, &key.offset);
|
|
BUG_ON(ret);
|
|
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;
|
|
}
|
|
|