From dee26a9f7aab7ffe1193cd1415b23a69426acc9f Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Mon, 26 Mar 2007 16:00:06 -0400 Subject: btrfs_get_block, file read/write Signed-off-by: Chris Mason --- fs/btrfs/file-item.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 50 insertions(+), 2 deletions(-) (limited to 'fs/btrfs/file-item.c') diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index 8e1e5b4ccfaf..4a0367d702b7 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -1,9 +1,57 @@ #include #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; +} -- cgit v1.2.2