[Ocfs2-devel] [PATCH 0/7 v3] ocfs2: allocate blocks in direct I/O write

[WeiWei Wang]

Hi all,

Currently in case of O_DIRECT append write (block not allocated yet),
ocfs2 will fall back to buffered I/O. This has some disadvantages.
Firstly, it is not the behavior as expected. Secondly, it will consume
huge page cache, e.g. in mass backup scenario. Thirdly, modern
filesystems such as ext4 support this feature.

In this patch set, the direct I/O write doesn't fallback to buffer I/O
write any more because the allocate blocks are enabled in direct I/O now.

This patch set can be applied against 3.17-rc6 branch of ocfs2 directly.

changelog:
v3 <- v2:
 -- fix a bug to unlock the inode EX lock in ocfs2_del_inode_from_orphan
    if ocfs2_journal_access_di return fail.
 -- fix a bug to unlock the inode EX lock before returned in
    ocfs2_direct_IO_get_blocks if the blocks are allocated.

Any feedbacks are always welcome.

Thanks,

							-- Wang

Weiwei Wang (7)
	ocfs2: eliminate the static flag of some functions
	ocfs2: add two functions of add and remove inode in orphan dir
	ocfs2: add orphan recovery types in ocfs2_recover_orphans
	ocfs2: add and remove inode to orphan in ocfs2_direct_IO
	ocfs2: allocate blocks in ocfs2_direct_IO_get_blocks
	ocfs2: do not fallback to buffer I/O write if appending
	ocfs2: do not fallback to buffer I/O write if fill holes



 fs/ocfs2/aops.c    | 164 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
 fs/ocfs2/file.c    | 104 +++++++++++++++++++++++++++++++++++++++-----------------------------------------------------------------
 fs/ocfs2/file.h    |   9 +++++++++
 fs/ocfs2/journal.c |  90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------
 fs/ocfs2/journal.h |   5 +++++
 fs/ocfs2/namei.c   | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------
 fs/ocfs2/namei.h   |  21 ++++++++++++++++++++-
 fs/ocfs2/ocfs2.h   |   6 ++++++
 8 files changed, 459 insertions(+), 105 deletions(-)