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| author | Akira Fujita <a-fujita@rs.jp.nec.com> | 2009-06-18 03:24:03 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-06-18 03:24:03 +0400 |
| commit | 748de6736c1e482e111f9d1b5a5d5b1787600cad (patch) | |
| tree | 9e5bd6085cd0eea0453c2a8bbce1422f291f059f /fs/ext4/ext4_extents.h | |
| parent | 8b0f9e8f78bd0a65fa001bf18f2c47eef2893a10 (diff) | |
| download | linux-748de6736c1e482e111f9d1b5a5d5b1787600cad.tar.xz | |
ext4: online defrag -- Add EXT4_IOC_MOVE_EXT ioctl
The EXT4_IOC_MOVE_EXT exchanges the blocks between orig_fd and donor_fd,
and then write the file data of orig_fd to donor_fd.
ext4_mext_move_extent() is the main fucntion of ext4 online defrag,
and this patch includes all functions related to ext4 online defrag.
Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: Takashi Sato <t-sato@yk.jp.nec.com>
Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4_extents.h')
| -rw-r--r-- | fs/ext4/ext4_extents.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h index f0c3ec85bd48..20a84105a10b 100644 --- a/fs/ext4/ext4_extents.h +++ b/fs/ext4/ext4_extents.h @@ -221,12 +221,16 @@ static inline int ext4_ext_get_actual_len(struct ext4_extent *ext) } extern int ext4_ext_calc_metadata_amount(struct inode *inode, int blocks); +extern ext4_fsblk_t ext_pblock(struct ext4_extent *ex); extern ext4_fsblk_t idx_pblock(struct ext4_extent_idx *); extern void ext4_ext_store_pblock(struct ext4_extent *, ext4_fsblk_t); extern int ext4_extent_tree_init(handle_t *, struct inode *); extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int num, struct ext4_ext_path *path); +extern int ext4_can_extents_be_merged(struct inode *inode, + struct ext4_extent *ex1, + struct ext4_extent *ex2); extern int ext4_ext_try_to_merge(struct inode *inode, struct ext4_ext_path *path, struct ext4_extent *); |