On 05/23/2011 08:59 AM, Arne Jansen wrote:
> Add state information for readahead to btrfs_fs_info and btrfs_device
>
> Signed-off-by: Arne Jansen <[email protected]>
> ---
> fs/btrfs/ctree.h | 4 ++++
> fs/btrfs/disk-io.c | 4 ++++
> fs/btrfs/volumes.c | 8 ++++++++
> fs/btrfs/volumes.h | 8 ++++++++
> 4 files changed, 24 insertions(+), 0 deletions(-)
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index 2e61fe1..4a33e30 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -1079,6 +1079,10 @@ struct btrfs_fs_info {
>
> /* filesystem state */
> u64 fs_state;
> +
> + /* readahead tree */
> + spinlock_t reada_lock;
> + struct radix_tree_root reada_tree;
> };
>
> /*
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index 7753eb9..3d4f9c5 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -1803,6 +1803,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
> fs_info->max_inline = 8192 * 1024;
> fs_info->metadata_ratio = 0;
>
> + /* readahead state */
> + INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS);
> + spin_lock_init(&fs_info->reada_lock);
> +
> fs_info->thread_pool_size = min_t(unsigned long,
> num_online_cpus() + 2, 8);
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 8b9fb8c..800e670 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -396,6 +396,14 @@ static noinline int device_list_add(const char *path,
> }
> INIT_LIST_HEAD(&device->dev_alloc_list);
>
> + /* init readahead state */
> + spin_lock_init(&device->reada_lock);
> + device->reada_curr_zone = NULL;
> + atomic_set(&device->reada_in_flight, 0);
> + device->reada_next = 0;
> + INIT_RADIX_TREE(&device->reada_zones, GFP_NOFS);
> + INIT_RADIX_TREE(&device->reada_extents, GFP_NOFS);
> +
> mutex_lock(&fs_devices->device_list_mutex);
> list_add(&device->dev_list, &fs_devices->devices);
> mutex_unlock(&fs_devices->device_list_mutex);
> diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
> index cc2eada..33acd4e 100644
> --- a/fs/btrfs/volumes.h
> +++ b/fs/btrfs/volumes.h
> @@ -86,6 +86,14 @@ struct btrfs_device {
> u8 uuid[BTRFS_UUID_SIZE];
>
> struct btrfs_work work;
> +
> + /* readahead state */
> + spinlock_t reada_lock;
> + atomic_t reada_in_flight;
> + u64 reada_next;
> + struct reada_zone *reada_curr_zone;
struct reada_zone has not been defined yet...
thanks,
liubo
> + struct radix_tree_root reada_zones;
> + struct radix_tree_root reada_extents;
> };
>
> struct btrfs_fs_devices {
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