btrfs_get_block, file read/write
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 8e1e5b4..4a0367d 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -1,9 +1,57 @@
#include <linux/module.h>
#include "ctree.h"
+#include "disk-io.h"
#include "transaction.h"
-int btrfs_create_file(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 dirid, u64 *objectid)
+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)
{
+ struct btrfs_key ins;
+ int ret = 0;
+ struct btrfs_file_extent_item *item;
+ struct btrfs_key file_key;
+ struct btrfs_path path;
+
+ btrfs_init_path(&path);
+ 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);
+
+ ret = btrfs_insert_empty_item(trans, root, &path, &file_key,
+ sizeof(*item));
+ item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
+ 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);
+ mark_buffer_dirty(path.nodes[0]);
+ *result = ins.objectid;
+ btrfs_release_path(root, &path);
return 0;
}
+
+int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 objectid,
+ u64 blocknr, u64 num_blocks, int mod)
+{
+ int ret;
+ struct btrfs_key file_key;
+ int ins_len = mod < 0 ? -1 : 0;
+ int cow = mod != 0;
+
+ file_key.objectid = objectid;
+ file_key.offset = blocknr;
+ 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;
+}