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| author | Chris Mason <chris.mason@oracle.com> | 2010-03-11 09:42:04 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2010-03-15 11:00:10 -0400 |
| commit | 1e701a3292e25a6c4939cad9f24951dc6b6ad853 (patch) | |
| tree | 899887a99aae82fe113bffedccb90a76e5473f8b /fs/btrfs/ioctl.h | |
| parent | 940100a4a7b78b27e60a3e72340fb9b5397dcdb2 (diff) | |
| download | lwn-1e701a3292e25a6c4939cad9f24951dc6b6ad853.tar.gz lwn-1e701a3292e25a6c4939cad9f24951dc6b6ad853.zip | |
Btrfs: add new defrag-range ioctl.
The btrfs defrag ioctl was limited to doing the entire file. This
commit adds a new interface that can defrag a specific range inside
the file.
It can also force compression on the file, allowing you to selectively
compress individual files after they were created, even when mount -o
compress isn't turned on.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ioctl.h')
| -rw-r--r-- | fs/btrfs/ioctl.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h index f1923e0260e3..2d64a65842f3 100644 --- a/fs/btrfs/ioctl.h +++ b/fs/btrfs/ioctl.h @@ -99,6 +99,35 @@ struct btrfs_ioctl_clone_range_args { __u64 dest_offset; }; +/* flags for the defrag range ioctl */ +#define BTRFS_DEFRAG_RANGE_COMPRESS 1 +#define BTRFS_DEFRAG_RANGE_START_IO 2 + +struct btrfs_ioctl_defrag_range_args { + /* start of the defrag operation */ + __u64 start; + + /* number of bytes to defrag, use (u64)-1 to say all */ + __u64 len; + + /* + * flags for the operation, which can include turning + * on compression for this one defrag + */ + __u64 flags; + + /* + * any extent bigger than this will be considered + * already defragged. Use 0 to take the kernel default + * Use 1 to say every single extent must be rewritten + */ + __u32 extent_thresh; + + /* spare for later */ + __u32 unused[5]; +}; + + #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \ struct btrfs_ioctl_vol_args) #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \ @@ -130,6 +159,8 @@ struct btrfs_ioctl_clone_range_args { struct btrfs_ioctl_vol_args) #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \ struct btrfs_ioctl_vol_args) +#define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \ + struct btrfs_ioctl_defrag_range_args) #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \ struct btrfs_ioctl_search_args) #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \ |