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| author | Zheng Liu <wenqing.lz@taobao.com> | 2012-07-22 20:19:31 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-07-22 20:19:31 -0400 |
| commit | 4bd809dbbf177ad0c450d702466b1da63e1b4b7e (patch) | |
| tree | 80493da203ac42a448489bc8e589207b9f735c2b /drivers/devfreq | |
| parent | 729f52c6be51013c9268e5fc85acbc1091286fdb (diff) | |
| download | op-kernel-dev-4bd809dbbf177ad0c450d702466b1da63e1b4b7e.zip op-kernel-dev-4bd809dbbf177ad0c450d702466b1da63e1b4b7e.tar.gz | |
ext4: don't take the i_mutex lock when doing DIO overwrites
Aligned and overwrite direct I/O can be parallelized. In
ext4_file_dio_write, we first check whether these conditions are
satisfied or not. If so, we take i_data_sem and release i_mutex lock
directly. Meanwhile iocb->private is set to indicate that this is a
dio overwrite, and it will be handled in ext4_ext_direct_IO.
[ Added fix from Dan Carpenter to fix locking bug on the error path. ]
CC: Tao Ma <tm@tao.ma>
CC: Eric Sandeen <sandeen@redhat.com>
CC: Robin Dong <hao.bigrat@gmail.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Diffstat (limited to 'drivers/devfreq')
0 files changed, 0 insertions, 0 deletions
