Re: [PATCH v8 3/4] xfs: xfs_isilocked() can only check a single lock type

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Mon, Oct 05, 2020 at 11:38:51PM +0200, Pavel Reichl wrote:
> In its current form, xfs_isilocked() is only able to test one lock type
> at a time - ilock, iolock, or mmap lock, but combinations are not
> properly handled. The intent here is to check that both XFS_IOLOCK_EXCL
> and XFS_ILOCK_EXCL are held, so test them each separately.
> 
> The commit ecfea3f0c8c6 ("xfs: split xfs_bmap_shift_extents") ORed the
> flags together which was an error, so this patch reverts that part of
> the change and check the locks independently.
> 
> Fixes: ecfea3f0c8c6 ("xfs: split xfs_bmap_shift_extents")
> 
> Suggested-by: Dave Chinner <dchinner@redhat.com>
> Signed-off-by: Pavel Reichl <preichl@redhat.com>

Looks good,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> ---
>  fs/xfs/libxfs/xfs_bmap.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
> index ced3b996cd8a..ff5cc8a5d476 100644
> --- a/fs/xfs/libxfs/xfs_bmap.c
> +++ b/fs/xfs/libxfs/xfs_bmap.c
> @@ -5787,7 +5787,8 @@ xfs_bmap_collapse_extents(
>  	if (XFS_FORCED_SHUTDOWN(mp))
>  		return -EIO;
>  
> -	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
> +	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
> +	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
>  
>  	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
>  		error = xfs_iread_extents(tp, ip, whichfork);
> @@ -5904,7 +5905,8 @@ xfs_bmap_insert_extents(
>  	if (XFS_FORCED_SHUTDOWN(mp))
>  		return -EIO;
>  
> -	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
> +	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
> +	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
>  
>  	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
>  		error = xfs_iread_extents(tp, ip, whichfork);
> -- 
> 2.26.2
>