On 06/29/2011 04:10 PM, Arne Jansen wrote:
> Add a READAHEAD extent buffer flag.
> Add a function to trigger a read with this flag set.
>
> Changes v2:
> - use extent buffer flags instead of extent state flags
>
> Signed-off-by: Arne Jansen <sensi...@gmx.net>
> ---
> fs/btrfs/disk-io.c | 32 ++++++++++++++++++++++++++++++++
> fs/btrfs/disk-io.h | 2 ++
> fs/btrfs/extent_io.h | 1 +
> 3 files changed, 35 insertions(+), 0 deletions(-)
>
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index cff882c..20edd2d 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -945,6 +945,38 @@ int readahead_tree_block(struct btrfs_root *root, u64
> bytenr, u32 blocksize,
> return ret;
> }
>
> +int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32
> blocksize,
> + int mirror_num, struct extent_buffer **eb)
> +{
> + struct extent_buffer *buf = NULL;
> + struct inode *btree_inode = root->fs_info->btree_inode;
> + struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree;
> + int ret;
> +
> + buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
> + if (!buf)
> + return 0;
> +
> + set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
> +
> + ret = read_extent_buffer_pages(io_tree, buf, 0, 0, 1, btree_get_extent,
> + mirror_num);
> + if (ret) {
> + free_extent_buffer(buf);
> + return ret;
> + }
> +
> + if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
> + *eb = buf;
> + return -EIO;
Why are you returning buf here when if you get an error from
read_extent_buffer_pages you free it? Instead free the extent buffer
and return EIO to be consistent. Thanks,
Josef
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