Shen Feng Wrote:

Akira Fujita Wrote:

quoted

ext4: online defrag-- Move victim files for the target file (-f mode)

From: Akira Fujita <redacted>

Move victim files to make sufficient space and reallocates
the contiguous blocks for the target file.

Signed-off-by: Akira Fujita <redacted>
Signed-off-by: Takashi Sato <redacted>
---
 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...

quoted

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?

ac_excepted_group has not only excepted block group number
but also -1 (it means any block groups are accepted).
So we should keep it as long long variable to show
the special status correctly in large ext4.

Regards,
Akira Fujita