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f2fs: delete DIO read lock 

This lock can be a contention with multi 4k random read IO with single inode.

example) fio --output=test --name=test --numjobs=60 --filename=/media/samsung960pro/file_test --rw=randread --bs=4k
 --direct=1 --time_based --runtime=7 --ioengine=libaio --iodepth=256 --group_reporting --size=10G

With this commit, it remove that possible lock contention.

Signed-off-by: Dongjoo Seo <commisori28@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
DongDongJu 2020-03-20 15:01:32 +09:00 committed by Jaegeuk Kim
parent 530e070420
commit ad8d6a02d6
1 changed files with 2 additions and 1 deletions
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3
fs/f2fs/data.c
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@ -3453,7 +3453,8 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
err = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
iter, rw == WRITE ? get_data_block_dio_write :
get_data_block_dio, NULL, f2fs_dio_submit_bio,
DIO_LOCKING | DIO_SKIP_HOLES);
rw == WRITE ? DIO_LOCKING | DIO_SKIP_HOLES :
DIO_SKIP_HOLES);
if (do_opu)
up_read(&fi->i_gc_rwsem[READ]);