Re: [PATCH 23/29] xfs: use IOMAP_DAX to check for DAX mappings

Darrick J. Wong
2021-11-23T23:01:29Z

On Tue, Nov 09, 2021 at 09:33:03AM +0100, Christoph Hellwig wrote:
> Use the explicit DAX flag instead of checking the inode flag in the
> iomap code.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Any particular reason to pass this in as a flag vs. querying the inode?

Doesn't really bother me either way, was just curious.
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
> fs/xfs/xfs_iomap.c | 7 ++++---
> fs/xfs/xfs_iomap.h | 3 ++-
> fs/xfs/xfs_pnfs.c | 2 +-
> 3 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
> index 604000b6243ec..8cef3b68cba78 100644
> --- a/fs/xfs/xfs_iomap.c
> +++ b/fs/xfs/xfs_iomap.c
> @@ -188,6 +188,7 @@ xfs_iomap_write_direct(
> struct xfs_inode *ip,
> xfs_fileoff_t offset_fsb,
> xfs_fileoff_t count_fsb,
> + unsigned int flags,
> struct xfs_bmbt_irec *imap)
> {
> struct xfs_mount *mp = ip->i_mount;
> @@ -229,7 +230,7 @@ xfs_iomap_write_direct(
> * the reserve block pool for bmbt block allocation if there is no space
> * left but we need to do unwritten extent conversion.
> */
> - if (IS_DAX(VFS_I(ip))) {
> + if (flags & IOMAP_DAX) {
> bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO;
> if (imap->br_state == XFS_EXT_UNWRITTEN) {
> force = true;
> @@ -620,7 +621,7 @@ imap_needs_alloc(
> imap->br_startblock == DELAYSTARTBLOCK)
> return true;
> /* we convert unwritten extents before copying the data for DAX */
> - if (IS_DAX(inode) && imap->br_state == XFS_EXT_UNWRITTEN)
> + if ((flags & IOMAP_DAX) && imap->br_state == XFS_EXT_UNWRITTEN)
> return true;
> return false;
> }
> @@ -826,7 +827,7 @@ xfs_direct_write_iomap_begin(
> xfs_iunlock(ip, lockmode);
>
> error = xfs_iomap_write_direct(ip, offset_fsb, end_fsb - offset_fsb,
> - &imap);
> + flags, &imap);
> if (error)
> return error;
>
> diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
> index f1a281ab9328c..5648262a71736 100644
> --- a/fs/xfs/xfs_iomap.h
> +++ b/fs/xfs/xfs_iomap.h
> @@ -12,7 +12,8 @@ struct xfs_inode;
> struct xfs_bmbt_irec;
>
> int xfs_iomap_write_direct(struct xfs_inode *ip, xfs_fileoff_t offset_fsb,
> - xfs_fileoff_t count_fsb, struct xfs_bmbt_irec *imap);
> + xfs_fileoff_t count_fsb, unsigned int flags,
> + struct xfs_bmbt_irec *imap);
> int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t, bool);
> xfs_fileoff_t xfs_iomap_eof_align_last_fsb(struct xfs_inode *ip,
> xfs_fileoff_t end_fsb);
> diff --git a/fs/xfs/xfs_pnfs.c b/fs/xfs/xfs_pnfs.c
> index 5e1d29d8b2e73..e188e1cf97cc5 100644
> --- a/fs/xfs/xfs_pnfs.c
> +++ b/fs/xfs/xfs_pnfs.c
> @@ -155,7 +155,7 @@ xfs_fs_map_blocks(
> xfs_iunlock(ip, lock_flags);
>
> error = xfs_iomap_write_direct(ip, offset_fsb,
> - end_fsb - offset_fsb, &imap);
> + end_fsb - offset_fsb, 0, &imap);
> if (error)
> goto out_unlock;
>
> --
> 2.30.2
>