On Mon, Jan 18, 2021 at 08:35:14PM +0100, Christoph Hellwig wrote:
> Pass a set of flags to iomap_dio_rw instead of the boolean
> wait_for_completion argument. The IOMAP_DIO_FORCE_WAIT flag
> replaces the wait_for_completion, but only needs to be passed
> when the iocb isn't synchronous to start with to simplify the
> callers.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> fs/btrfs/file.c | 7 +++----
> fs/ext4/file.c | 5 ++---
> fs/gfs2/file.c | 7 ++-----
> fs/iomap/direct-io.c | 11 +++++------
> fs/xfs/xfs_file.c | 7 +++----
> fs/zonefs/super.c | 4 ++--
> include/linux/iomap.h | 10 ++++++++--
> 7 files changed, 25 insertions(+), 26 deletions(-)
>
> diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
> index 0e41459b8de667..ddfd2e2adedf58 100644
> --- a/fs/btrfs/file.c
> +++ b/fs/btrfs/file.c
> @@ -1949,8 +1949,8 @@ static ssize_t btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from)
> goto buffered;
> }
>
> - dio = __iomap_dio_rw(iocb, from, &btrfs_dio_iomap_ops,
> - &btrfs_dio_ops, is_sync_kiocb(iocb));
> + dio = __iomap_dio_rw(iocb, from, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
> + 0);
>
> btrfs_inode_unlock(inode, ilock_flags);
>
> @@ -3622,8 +3622,7 @@ static ssize_t btrfs_direct_read(struct kiocb *iocb, struct iov_iter *to)
> return 0;
>
> btrfs_inode_lock(inode, BTRFS_ILOCK_SHARED);
> - ret = iomap_dio_rw(iocb, to, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
> - is_sync_kiocb(iocb));
> + ret = iomap_dio_rw(iocb, to, &btrfs_dio_iomap_ops, &btrfs_dio_ops, 0);
> btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
> return ret;
> }
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index 349b27f0dda0cb..194f5d00fa3267 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -74,8 +74,7 @@ static ssize_t ext4_dio_read_iter(struct kiocb *iocb, struct iov_iter *to)
> return generic_file_read_iter(iocb, to);
> }
>
> - ret = iomap_dio_rw(iocb, to, &ext4_iomap_ops, NULL,
> - is_sync_kiocb(iocb));
> + ret = iomap_dio_rw(iocb, to, &ext4_iomap_ops, NULL, 0);
> inode_unlock_shared(inode);
>
> file_accessed(iocb->ki_filp);
> @@ -550,7 +549,7 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (ilock_shared)
> iomap_ops = &ext4_iomap_overwrite_ops;
> ret = iomap_dio_rw(iocb, from, iomap_ops, &ext4_dio_write_ops,
> - is_sync_kiocb(iocb) || unaligned_io || extend);
> + (unaligned_io || extend) ? IOMAP_DIO_FORCE_WAIT : 0);
> if (ret == -ENOTBLK)
> ret = 0;
>
> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
> index b39b339feddc93..89609c2997177a 100644
> --- a/fs/gfs2/file.c
> +++ b/fs/gfs2/file.c
> @@ -797,9 +797,7 @@ static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to,
> if (ret)
> goto out_uninit;
>
> - ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL,
> - is_sync_kiocb(iocb));
> -
> + ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL, 0);
> gfs2_glock_dq(gh);
> out_uninit:
> gfs2_holder_uninit(gh);
> @@ -833,8 +831,7 @@ static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
> if (offset + len > i_size_read(&ip->i_inode))
> goto out;
>
> - ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
> - is_sync_kiocb(iocb));
> + ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL, 0);
> if (ret == -ENOTBLK)
> ret = 0;
> out:
> diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
> index 604103ab76f9c5..32dbbf7dd4aadb 100644
> --- a/fs/iomap/direct-io.c
> +++ b/fs/iomap/direct-io.c
> @@ -420,13 +420,15 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length,
> struct iomap_dio *
> __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
> - bool wait_for_completion)
> + unsigned int dio_flags)
> {
> struct address_space *mapping = iocb->ki_filp->f_mapping;
> struct inode *inode = file_inode(iocb->ki_filp);
> size_t count = iov_iter_count(iter);
> loff_t pos = iocb->ki_pos;
> loff_t end = iocb->ki_pos + count - 1, ret = 0;
> + bool wait_for_completion =
> + is_sync_kiocb(iocb) || (dio_flags & IOMAP_DIO_FORCE_WAIT);
> unsigned int iomap_flags = IOMAP_DIRECT;
> struct blk_plug plug;
> struct iomap_dio *dio;
> @@ -434,9 +436,6 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> if (!count)
> return NULL;
>
> - if (WARN_ON(is_sync_kiocb(iocb) && !wait_for_completion))
> - return ERR_PTR(-EIO);
> -
> dio = kmalloc(sizeof(*dio), GFP_KERNEL);
> if (!dio)
> return ERR_PTR(-ENOMEM);
> @@ -598,11 +597,11 @@ EXPORT_SYMBOL_GPL(__iomap_dio_rw);
> ssize_t
> iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
> - bool wait_for_completion)
> + unsigned int flags)
> {
> struct iomap_dio *dio;
>
> - dio = __iomap_dio_rw(iocb, iter, ops, dops, wait_for_completion);
> + dio = __iomap_dio_rw(iocb, iter, ops, dops, flags);
> if (IS_ERR_OR_NULL(dio))
> return PTR_ERR_OR_ZERO(dio);
> return iomap_dio_complete(dio);
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index bffd7240cefb7f..b181db42f2f32f 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -232,8 +232,7 @@ xfs_file_dio_read(
> ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
> if (ret)
> return ret;
> - ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL,
> - is_sync_kiocb(iocb));
> + ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL, 0);
> xfs_iunlock(ip, XFS_IOLOCK_SHARED);
>
> return ret;
> @@ -535,7 +534,7 @@ xfs_file_dio_write_aligned(
> }
> trace_xfs_file_direct_write(iocb, from);
> ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops,
> - &xfs_dio_write_ops, is_sync_kiocb(iocb));
> + &xfs_dio_write_ops, 0);
> out_unlock:
> if (iolock)
> xfs_iunlock(ip, iolock);
> @@ -603,7 +602,7 @@ xfs_file_dio_write_unaligned(
> */
> trace_xfs_file_direct_write(iocb, from);
> ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops,
> - &xfs_dio_write_ops, true);
> + &xfs_dio_write_ops, IOMAP_DIO_FORCE_WAIT);
> out_unlock:
> if (iolock)
> xfs_iunlock(ip, iolock);
> diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
> index bec47f2d074beb..0e7ab0bc00ae8e 100644
> --- a/fs/zonefs/super.c
> +++ b/fs/zonefs/super.c
> @@ -780,7 +780,7 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
> ret = zonefs_file_dio_append(iocb, from);
> else
> ret = iomap_dio_rw(iocb, from, &zonefs_iomap_ops,
> - &zonefs_write_dio_ops, sync);
> + &zonefs_write_dio_ops, 0);
> if (zi->i_ztype == ZONEFS_ZTYPE_SEQ &&
> (ret > 0 || ret == -EIOCBQUEUED)) {
> if (ret > 0)
> @@ -917,7 +917,7 @@ static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
> }
> file_accessed(iocb->ki_filp);
> ret = iomap_dio_rw(iocb, to, &zonefs_iomap_ops,
> - &zonefs_read_dio_ops, is_sync_kiocb(iocb));
> + &zonefs_read_dio_ops, 0);
> } else {
> ret = generic_file_read_iter(iocb, to);
> if (ret == -EIO)
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index 5bd3cac4df9cb4..b322598dc10ec0 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -256,12 +256,18 @@ struct iomap_dio_ops {
> struct bio *bio, loff_t file_offset);
> };
>
> +/*
> + * Wait for the I/O to complete in iomap_dio_rw even if the kiocb is not
> + * synchronous.
> + */
> +#define IOMAP_DIO_FORCE_WAIT (1 << 0)
> +
> ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
> - bool wait_for_completion);
> + unsigned int flags);
> struct iomap_dio *__iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
> - bool wait_for_completion);
> + unsigned int flags);
> ssize_t iomap_dio_complete(struct iomap_dio *dio);
> int iomap_dio_iopoll(struct kiocb *kiocb, bool spin);
>
> --
> 2.29.2
>
