[0/7] Btrfs: defrag: the remaining unmerged part

Message

Qu Wenruo Feb. 24, 2022, 12:28 p.m. UTC

David has already rebased all bug fixes into his fix/autodefrag-io
branch.
(Although the last patch still lacks one line to make it work).

This patchset is the remaining related cleanups.

If the 2nd patch doesn't apply, it means the patch "trfs:
reduce extent threshold for autodefrag" is not correct, and doesn't
apply extent_thresh properly.

The first patch removes one unused parameter.
The second patch makes __btrfs_run_defrag_inode() to meet our current
standard.

Patch 3~6 re-introduce the btrfs_defrag_ctrl to cleanup the argument
lists, and make btrfs_defrag_file() reports accurate sectors_defragged.

The last patch introduces the needed trace events.
With the trace events, it's much easier to verify the defrag behavior,
and provide a user-friendly way to debug defrag bugs.

Originally I used those trace events to verfy the reduced extent_thresh
for autodefrag, but I found out a better way to verify the behavior
without using trace events.

So I'll send a new test case to check the changed autodefrag behavior.

Qu Wenruo (7):
  btrfs: remove unused parameter for btrfs_add_inode_defrag()
  btrfs: refactor __btrfs_run_defrag_inode()
  btrfs: uapi: introduce BTRFS_DEFRAG_RANGE_MASK for later sanity check
  btrfs: defrag: introduce btrfs_defrag_ctrl structure for later usage
  btrfs: defrag: use btrfs_defrag_ctrl to replace
    btrfs_ioctl_defrag_range_args for btrfs_defrag_file()
  btrfs: defrag: make btrfs_defrag_file() to report accurate number of
    defragged sectors
  btrfs: add trace events for defrag

 fs/btrfs/ctree.h             |  25 +++-
 fs/btrfs/file.c              |  92 +++++++--------
 fs/btrfs/inode.c             |   2 +-
 fs/btrfs/ioctl.c             | 213 ++++++++++++++++++-----------------
 include/trace/events/btrfs.h | 127 +++++++++++++++++++++
 include/uapi/linux/btrfs.h   |   6 +-
 6 files changed, 310 insertions(+), 155 deletions(-)