On Sun, Jul 01, 2012 at 10:21:45PM +0800, Zheng Liu wrote: > From: Zheng Liu <wenqing.lz@xxxxxxxxxx> > > EXT4_GET_BLOCKS_NO_LOCK flag is added to indicate that we don't need to acquire > i_data_sem lock in ext4_map_blocks. Meanwhile, it lets _ext4_get_block do not > start a new journal because when we do a overwrite dio, there is no any > metadata that needs to be modified. > > We define a new function called ext4_get_block_write_nolock, which is used in > dio overwrite nolock. In this function, it doesn't try to acquire i_data_sem > lock and doesn't start a new journal as it does a lookup. > > CC: Tao Ma <tm@xxxxxx> > CC: Eric Sandeen <sandeen@xxxxxxxxxx> > CC: Robin Dong <hao.bigrat@xxxxxxxxx> > Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx> Thanks, applied. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
