Akira Fujita Wrote:
> ext4: online defrag-- Move victim files for the target file (-f mode)
>
> From: Akira Fujita <a-fujita@xxxxxxxxxxxxx>
>
> Move victim files to make sufficient space and reallocates
> the contiguous blocks for the target file.
>
> Signed-off-by: Akira Fujita <a-fujita@xxxxxxxxxxxxx>
> Signed-off-by: Takashi Sato <t-sato@xxxxxxxxxxxxx>
> ---
> fs/ext4/balloc.c | 10 +-
> fs/ext4/defrag.c | 460 +++++++++++++++++++++++++++++++++++++++++++++---
> fs/ext4/ext4.h | 29 +++-
> fs/ext4/ext4_extents.h | 5 +
> fs/ext4/extents.c | 54 +++++--
> fs/ext4/ioctl.c | 5 +-
> fs/ext4/mballoc.c | 5 +
> fs/ext4/mballoc.h | 1 +
> 8 files changed, 522 insertions(+), 47 deletions(-)
>
...snip...
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index d0b1301..88fd100 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -94,6 +94,11 @@ struct ext4_allocation_request {
> unsigned long len;
> /* flags. see above EXT4_MB_HINT_* */
> unsigned long flags;
> + /*
> + * for ext4 online defrag:
> + * the block group which is excepted from allocation target
> + */
> + long long excepted_group;
> };
Why not ext4_group_t for excepted_group here?
>
> /*
> @@ -303,6 +308,9 @@ struct ext4_new_group_data {
> #define EXT4_IOC_GROUP_INFO _IOW('f', 11, struct ext4_group_data_info)
> #define EXT4_IOC_FREE_BLOCKS_INFO _IOW('f', 12, struct ext4_extents_info)
> #define EXT4_IOC_EXTENTS_INFO _IOW('f', 13, struct ext4_extents_info)
> +#define EXT4_IOC_RESERVE_BLOCK _IOW('f', 14, struct ext4_extents_info)
> +#define EXT4_IOC_MOVE_VICTIM _IOW('f', 15, struct ext4_extents_info)
> +#define EXT4_IOC_BLOCK_RELEASE _IO('f', 8)
>
...snip...
> diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
> index bfe6add..1141ad5 100644
> --- a/fs/ext4/mballoc.h
> +++ b/fs/ext4/mballoc.h
> @@ -205,6 +205,7 @@ struct ext4_allocation_context {
> struct page *ac_buddy_page;
> struct ext4_prealloc_space *ac_pa;
> struct ext4_locality_group *ac_lg;
> + long long ac_excepted_group;
ditto
> };
>
> #define AC_STATUS_CONTINUE 1
>
> --
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>
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