[PATCH 0/7] nilfs2 updates

[Ryusuke Konishi]

Hi Andrew,

Please queue the following changes for the next merge window:

Ryusuke Konishi (7):
      nilfs2: do not use async write flag for segment summary buffers
      nilfs2: use set_mask_bits() for operations on buffer state bitmap
      nilfs2: use bgl_lock_ptr()
      nilfs2: unify type of key arguments in bmap interface
      nilfs2: add bmap function to seek a valid key
      nilfs2: add helper to find existent block on metadata file
      nilfs2: improve execution time of NILFS_IOCTL_GET_CPINFO ioctl

* Brief summary

> nilfs2: do not use async write flag for segment summary buffers
> nilfs2: use set_mask_bits() for operations on buffer state bitmap

These reduce the number of atomic bit operations against b_state
bitmap by utilizing set_mask_bits() common helper, or by removing
unnecessary bit operations.

> nilfs2: use bgl_lock_ptr()

This is a cleanup patch, which makes use of bgl_lock_ptr() common
helper for simplicity.

> nilfs2: unify type of key arguments in bmap interface
> nilfs2: add bmap function to seek a valid key
> nilfs2: add helper to find existent block on metadata file
> nilfs2: improve execution time of NILFS_IOCTL_GET_CPINFO ioctl

These improve execution time of the ioctl for checkpoint listing,
which gets worse as the file system ages.

Example:
  [The current implementation]
  $ time lscp
                   CNO        DATE     TIME  MODE  FLG      BLKCNT       ICNT
               5769303  2015-02-22 19:31:33   cp    -          108          1
               5769304  2015-02-22 19:38:54   cp    -          108          1
    
  real    0m0.182s
  user    0m0.003s
  sys     0m0.180s
    
  [With the patchset]
  $ time lscp
                   CNO        DATE     TIME  MODE  FLG      BLKCNT       ICNT
               5769303  2015-02-22 19:31:33   cp    -          108          1
               5769304  2015-02-22 19:38:54   cp    -          108          1
    
  real    0m0.003s
  user    0m0.001s
  sys     0m0.002s

Thanks,
Ryusuke Konishi
--

 fs/nilfs2/alloc.c   |  5 ++--
 fs/nilfs2/bmap.c    | 48 +++++++++++++++++++++++++++++---------
 fs/nilfs2/bmap.h    | 13 +++++++----
 fs/nilfs2/btree.c   | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/nilfs2/cpfile.c  | 58 +++++++++++++++++++++++++++++++++++++++++-----
 fs/nilfs2/direct.c  | 17 ++++++++++++++
 fs/nilfs2/inode.c   |  6 ++---
 fs/nilfs2/mdt.c     | 54 +++++++++++++++++++++++++++++++++++++++++++
 fs/nilfs2/mdt.h     | 10 ++++++--
 fs/nilfs2/page.c    | 24 ++++++++-----------
 fs/nilfs2/segment.c | 17 +++++++-------
 11 files changed, 266 insertions(+), 52 deletions(-)

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