Re: [PATCH 4/6] xfs/532: Fix test to execute in multi-block directory config

["Darrick J. Wong" <djwong@kernel.org>]

On Thu, Mar 25, 2021 at 07:38:55PM +0530, Chandan Babu R wrote:
> xfs/532 attempts to create $testfile after reduce_max_iextents error tag is
> injected. Creation of $testfile fails when using a multi-block directory test
> configuration because,
> 1. A directory can have a pseudo maximum extent count of 10.
> 2. In the worst case a directory entry creation operation can consume
>    (XFS_DA_NODE_MAXDEPTH + 1 + 1) * (Nr fs blocks in a single directory block)
>    extents.
>    With 1k fs block size and 4k directory block size, this evaluates to,
>    (5 + 1 + 1) * 4
>    = 7 * 4
>    = 28
>    > 10 (Pseudo maximum inode extent count).
> 
> This commit fixes the issue by creating $testfile before injecting
> reduce_max_iextents error tag.
> 
> Reported-by: Darrick J. Wong <djwong@kernel.org>
> Suggested-by: Darrick J. Wong <djwong@kernel.org>
> Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>

Looks ok (and like Eryu says, this could all have been one large patch),
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  tests/xfs/532     | 17 ++++++++++-------
>  tests/xfs/532.out |  6 +++---
>  2 files changed, 13 insertions(+), 10 deletions(-)
> 
> diff --git a/tests/xfs/532 b/tests/xfs/532
> index 1c789217..2bed574a 100755
> --- a/tests/xfs/532
> +++ b/tests/xfs/532
> @@ -63,9 +63,6 @@ for dentry in $(ls -1 $fillerdir/); do
>  	$here/src/punch-alternating $fillerdir/$dentry >> $seqres.full
>  done
>  
> -echo "Inject reduce_max_iextents error tag"
> -_scratch_inject_error reduce_max_iextents 1
> -
>  echo "Inject bmap_alloc_minlen_extent error tag"
>  _scratch_inject_error bmap_alloc_minlen_extent 1
>  
> @@ -74,6 +71,9 @@ echo "* Set xattrs"
>  echo "Create \$testfile"
>  touch $testfile
>  
> +echo "Inject reduce_max_iextents error tag"
> +_scratch_inject_error reduce_max_iextents 1
> +
>  echo "Create xattrs"
>  nr_attrs=$((bsize * 20 / attr_len))
>  for i in $(seq 1 $nr_attrs); do
> @@ -90,6 +90,9 @@ if (( $naextents > 10 )); then
>  	exit 1
>  fi
>  
> +echo "Disable reduce_max_iextents error tag"
> +_scratch_inject_error reduce_max_iextents 0
> +
>  echo "Remove \$testfile"
>  rm $testfile
>  
> @@ -98,9 +101,6 @@ echo "* Remove xattrs"
>  echo "Create \$testfile"
>  touch $testfile
>  
> -echo "Disable reduce_max_iextents error tag"
> -_scratch_inject_error reduce_max_iextents 0
> -
>  echo "Create initial xattr extents"
>  
>  naextents=0
> @@ -132,7 +132,10 @@ if [[ $? == 0 ]]; then
>  	exit 1
>  fi
>  
> -rm $testfile && echo "Successfully removed \$testfile"
> +echo "Disable reduce_max_iextents error tag"
> +_scratch_inject_error reduce_max_iextents 0
> +
> +rm $testfile
>  
>  # success, all done
>  status=0
> diff --git a/tests/xfs/532.out b/tests/xfs/532.out
> index 8e19d7bc..db52108f 100644
> --- a/tests/xfs/532.out
> +++ b/tests/xfs/532.out
> @@ -2,17 +2,17 @@ QA output created by 532
>  Format and mount fs
>  Consume free space
>  Create fragmented filesystem
> -Inject reduce_max_iextents error tag
>  Inject bmap_alloc_minlen_extent error tag
>  * Set xattrs
>  Create $testfile
> +Inject reduce_max_iextents error tag
>  Create xattrs
>  Verify $testfile's naextent count
> +Disable reduce_max_iextents error tag
>  Remove $testfile
>  * Remove xattrs
>  Create $testfile
> -Disable reduce_max_iextents error tag
>  Create initial xattr extents
>  Inject reduce_max_iextents error tag
>  Remove xattr to trigger -EFBIG
> -Successfully removed $testfile
> +Disable reduce_max_iextents error tag
> -- 
> 2.29.2
>