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f2fs: add to account direct IO

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This patch adds f2fs_dio_submit_bio() to hook submit_io/end_io functions
in direct IO path, in order to account DIO.

Later, we will add this count into is_idle() to let background GC/Discard
thread be aware of DIO.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2018-11-12 00:46:46 +08:00
committed by Jaegeuk Kim
parent b61ac5b720
commit 02b16d0a34
3 changed files with 64 additions and 1 deletions
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51
fs/f2fs/data.c
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@@ -2548,6 +2548,53 @@ static int check_direct_IO(struct inode *inode, struct iov_iter *iter,
return 0;
}
static void f2fs_dio_end_io(struct bio *bio)
{
struct f2fs_private_dio *dio = bio->bi_private;
dec_page_count(F2FS_I_SB(dio->inode),
dio->write ? F2FS_DIO_WRITE : F2FS_DIO_READ);
bio->bi_private = dio->orig_private;
bio->bi_end_io = dio->orig_end_io;
kfree(dio);
bio_endio(bio);
}
static void f2fs_dio_submit_bio(struct bio *bio, struct inode *inode,
loff_t file_offset)
{
struct f2fs_private_dio *dio;
bool write = (bio_op(bio) == REQ_OP_WRITE);
int err;
dio = f2fs_kzalloc(F2FS_I_SB(inode),
sizeof(struct f2fs_private_dio), GFP_NOFS);
if (!dio) {
err = -ENOMEM;
goto out;
}
dio->inode = inode;
dio->orig_end_io = bio->bi_end_io;
dio->orig_private = bio->bi_private;
dio->write = write;
bio->bi_end_io = f2fs_dio_end_io;
bio->bi_private = dio;
inc_page_count(F2FS_I_SB(inode),
write ? F2FS_DIO_WRITE : F2FS_DIO_READ);
submit_bio(bio);
return;
out:
bio->bi_status = BLK_STS_IOERR;
bio_endio(bio);
}
static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
@@ -2594,7 +2641,9 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
down_read(&fi->i_gc_rwsem[READ]);
}
err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
err = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
iter, get_data_block_dio, NULL, f2fs_dio_submit_bio,
DIO_LOCKING | DIO_SKIP_HOLES);
if (do_opu)
up_read(&fi->i_gc_rwsem[READ]);