Re: [PATCH 2/6] xfs/529: Fix test to execute in multi-block directory config

[Eryu Guan <guan@eryu.me>]

On Thu, Mar 25, 2021 at 07:38:53PM +0530, Chandan Babu R wrote:
> xfs/529 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>

Seems patch 2 to 6 fix the same bug in different tests, I think we could
put the fixes in one patch.

Thanks,
Eryu
> ---
>  tests/xfs/529     | 24 +++++++++++++++++++++---
>  tests/xfs/529.out |  6 +++++-
>  2 files changed, 26 insertions(+), 4 deletions(-)
> 
> diff --git a/tests/xfs/529 b/tests/xfs/529
> index abe5b1e0..b4533eba 100755
> --- a/tests/xfs/529
> +++ b/tests/xfs/529
> @@ -54,6 +54,8 @@ echo "* Delalloc to written extent conversion"
>  
>  testfile=$SCRATCH_MNT/testfile
>  
> +touch $testfile
> +
>  echo "Inject reduce_max_iextents error tag"
>  _scratch_inject_error reduce_max_iextents 1
>  
> @@ -74,10 +76,18 @@ if (( $nextents > 10 )); then
>  	exit 1
>  fi
>  
> +echo "Disable reduce_max_iextents error tag"
> +_scratch_inject_error reduce_max_iextents 0
> +
>  rm $testfile
>  
>  echo "* Fallocate unwritten extents"
>  
> +touch $testfile
> +
> +echo "Inject reduce_max_iextents error tag"
> +_scratch_inject_error reduce_max_iextents 1
> +
>  echo "Fallocate fragmented file"
>  for i in $(seq 0 2 $((nr_blks - 1))); do
>  	$XFS_IO_PROG -f -c "falloc $((i * bsize)) $bsize" $testfile \
> @@ -93,10 +103,18 @@ if (( $nextents > 10 )); then
>  	exit 1
>  fi
>  
> +echo "Disable reduce_max_iextents error tag"
> +_scratch_inject_error reduce_max_iextents 0
> +
>  rm $testfile
>  
>  echo "* Directio write"
>  
> +touch $testfile
> +
> +echo "Inject reduce_max_iextents error tag"
> +_scratch_inject_error reduce_max_iextents 1
> +
>  echo "Create fragmented file via directio writes"
>  for i in $(seq 0 2 $((nr_blks - 1))); do
>  	$XFS_IO_PROG -d -s -f -c "pwrite $((i * bsize)) $bsize" $testfile \
> @@ -112,15 +130,15 @@ if (( $nextents > 10 )); then
>  	exit 1
>  fi
>  
> +echo "Disable reduce_max_iextents error tag"
> +_scratch_inject_error reduce_max_iextents 0
> +
>  rm $testfile
>  
>  # Check if XFS gracefully returns with an error code when we try to increase
>  # extent count of user quota inode beyond the pseudo max extent count limit.
>  echo "* Extend quota inodes"
>  
> -echo "Disable reduce_max_iextents error tag"
> -_scratch_inject_error reduce_max_iextents 0
> -
>  echo "Consume free space"
>  fillerdir=$SCRATCH_MNT/fillerdir
>  nr_free_blks=$(stat -f -c '%f' $SCRATCH_MNT)
> diff --git a/tests/xfs/529.out b/tests/xfs/529.out
> index b2ae3f42..13489d34 100644
> --- a/tests/xfs/529.out
> +++ b/tests/xfs/529.out
> @@ -4,14 +4,18 @@ Format and mount fs
>  Inject reduce_max_iextents error tag
>  Create fragmented file
>  Verify $testfile's extent count
> +Disable reduce_max_iextents error tag
>  * Fallocate unwritten extents
> +Inject reduce_max_iextents error tag
>  Fallocate fragmented file
>  Verify $testfile's extent count
> +Disable reduce_max_iextents error tag
>  * Directio write
> +Inject reduce_max_iextents error tag
>  Create fragmented file via directio writes
>  Verify $testfile's extent count
> -* Extend quota inodes
>  Disable reduce_max_iextents error tag
> +* Extend quota inodes
>  Consume free space
>  Create fragmented filesystem
>  Inject reduce_max_iextents error tag
> -- 
> 2.29.2