2007-03-21 22:12:56 +07:00
|
|
|
#include <linux/module.h>
|
2007-03-16 06:03:33 +07:00
|
|
|
#include "ctree.h"
|
2007-03-27 03:00:06 +07:00
|
|
|
#include "disk-io.h"
|
2007-03-21 01:38:32 +07:00
|
|
|
#include "transaction.h"
|
2007-03-16 06:03:33 +07:00
|
|
|
|
2007-03-27 03:00:06 +07:00
|
|
|
int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root,
|
|
|
|
u64 objectid, u64 offset,
|
|
|
|
u64 num_blocks, u64 hint_block,
|
|
|
|
u64 *result)
|
2007-03-21 01:38:32 +07:00
|
|
|
{
|
2007-03-27 03:00:06 +07:00
|
|
|
struct btrfs_key ins;
|
|
|
|
int ret = 0;
|
|
|
|
struct btrfs_file_extent_item *item;
|
|
|
|
struct btrfs_key file_key;
|
2007-04-02 22:20:42 +07:00
|
|
|
struct btrfs_path *path;
|
2007-03-27 03:00:06 +07:00
|
|
|
|
2007-04-02 22:20:42 +07:00
|
|
|
path = btrfs_alloc_path();
|
|
|
|
BUG_ON(!path);
|
|
|
|
btrfs_init_path(path);
|
2007-03-27 03:00:06 +07:00
|
|
|
ret = btrfs_alloc_extent(trans, root, num_blocks, hint_block,
|
|
|
|
(u64)-1, objectid, &ins);
|
|
|
|
BUG_ON(ret);
|
|
|
|
file_key.objectid = objectid;
|
|
|
|
file_key.offset = offset;
|
|
|
|
file_key.flags = 0;
|
|
|
|
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
|
|
|
|
|
2007-04-02 22:20:42 +07:00
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
|
2007-03-27 03:00:06 +07:00
|
|
|
sizeof(*item));
|
2007-03-27 22:26:26 +07:00
|
|
|
BUG_ON(ret);
|
2007-04-02 22:20:42 +07:00
|
|
|
item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
|
2007-03-27 03:00:06 +07:00
|
|
|
struct btrfs_file_extent_item);
|
|
|
|
btrfs_set_file_extent_disk_blocknr(item, ins.objectid);
|
|
|
|
btrfs_set_file_extent_disk_num_blocks(item, ins.offset);
|
|
|
|
btrfs_set_file_extent_offset(item, 0);
|
|
|
|
btrfs_set_file_extent_num_blocks(item, ins.offset);
|
2007-03-27 20:16:29 +07:00
|
|
|
btrfs_set_file_extent_generation(item, trans->transid);
|
2007-04-02 22:20:42 +07:00
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
2007-03-27 03:00:06 +07:00
|
|
|
*result = ins.objectid;
|
2007-04-02 22:20:42 +07:00
|
|
|
btrfs_release_path(root, path);
|
|
|
|
btrfs_free_path(path);
|
2007-03-21 01:38:32 +07:00
|
|
|
return 0;
|
|
|
|
}
|
2007-03-27 03:00:06 +07:00
|
|
|
|
|
|
|
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root,
|
|
|
|
struct btrfs_path *path, u64 objectid,
|
2007-03-27 22:26:26 +07:00
|
|
|
u64 offset, int mod)
|
2007-03-27 03:00:06 +07:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_key file_key;
|
|
|
|
int ins_len = mod < 0 ? -1 : 0;
|
|
|
|
int cow = mod != 0;
|
|
|
|
|
|
|
|
file_key.objectid = objectid;
|
2007-03-27 22:26:26 +07:00
|
|
|
file_key.offset = offset;
|
2007-03-27 03:00:06 +07:00
|
|
|
file_key.flags = 0;
|
|
|
|
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
|
|
|
|
ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
|
|
|
|
return ret;
|
|
|
|
}
|
2007-03-30 02:15:27 +07:00
|
|
|
|
|
|
|
int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root,
|
|
|
|
u64 objectid, u64 offset,
|
|
|
|
char *data, size_t len)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_key file_key;
|
2007-04-02 22:20:42 +07:00
|
|
|
struct btrfs_path *path;
|
2007-03-30 02:15:27 +07:00
|
|
|
struct btrfs_csum_item *item;
|
|
|
|
|
2007-04-02 22:20:42 +07:00
|
|
|
path = btrfs_alloc_path();
|
|
|
|
BUG_ON(!path);
|
|
|
|
btrfs_init_path(path);
|
2007-03-30 02:15:27 +07:00
|
|
|
file_key.objectid = objectid;
|
|
|
|
file_key.offset = offset;
|
|
|
|
file_key.flags = 0;
|
|
|
|
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
|
2007-04-02 22:20:42 +07:00
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
|
2007-03-30 02:15:27 +07:00
|
|
|
BTRFS_CSUM_SIZE);
|
|
|
|
if (ret != 0 && ret != -EEXIST)
|
|
|
|
goto fail;
|
2007-04-02 22:20:42 +07:00
|
|
|
item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
|
2007-03-30 02:15:27 +07:00
|
|
|
struct btrfs_csum_item);
|
|
|
|
ret = 0;
|
|
|
|
ret = btrfs_csum_data(root, data, len, item->csum);
|
2007-04-02 22:20:42 +07:00
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
2007-03-30 02:15:27 +07:00
|
|
|
fail:
|
2007-04-02 22:20:42 +07:00
|
|
|
btrfs_release_path(root, path);
|
|
|
|
btrfs_free_path(path);
|
2007-03-30 02:15:27 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_csum_verify_file_block(struct btrfs_root *root,
|
|
|
|
u64 objectid, u64 offset,
|
|
|
|
char *data, size_t len)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_key file_key;
|
2007-04-02 22:20:42 +07:00
|
|
|
struct btrfs_path *path;
|
2007-03-30 02:15:27 +07:00
|
|
|
struct btrfs_csum_item *item;
|
|
|
|
char result[BTRFS_CSUM_SIZE];
|
|
|
|
|
2007-04-02 22:20:42 +07:00
|
|
|
path = btrfs_alloc_path();
|
|
|
|
BUG_ON(!path);
|
|
|
|
btrfs_init_path(path);
|
2007-03-30 02:15:27 +07:00
|
|
|
file_key.objectid = objectid;
|
|
|
|
file_key.offset = offset;
|
|
|
|
file_key.flags = 0;
|
|
|
|
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
|
2007-04-03 02:43:21 +07:00
|
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
2007-04-02 22:20:42 +07:00
|
|
|
ret = btrfs_search_slot(NULL, root, &file_key, path, 0, 0);
|
2007-03-30 02:15:27 +07:00
|
|
|
if (ret)
|
|
|
|
goto fail;
|
2007-04-02 22:20:42 +07:00
|
|
|
item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
|
2007-03-30 02:15:27 +07:00
|
|
|
struct btrfs_csum_item);
|
|
|
|
ret = 0;
|
|
|
|
ret = btrfs_csum_data(root, data, len, result);
|
|
|
|
WARN_ON(ret);
|
|
|
|
if (memcmp(result, item->csum, BTRFS_CSUM_SIZE))
|
|
|
|
ret = 1;
|
|
|
|
fail:
|
2007-04-02 22:20:42 +07:00
|
|
|
btrfs_release_path(root, path);
|
|
|
|
btrfs_free_path(path);
|
2007-04-03 02:43:21 +07:00
|
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
2007-03-30 02:15:27 +07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|