Re: [PATCH] ext4/048: Fix hangup due to no free inodes

Baokun Li
2025-10-28T07:57:10Z

On 2025-10-28 15:17, Ojaswin Mujoo wrote:
> We currently mkfs a 128MB filesystem, which gives use ~2048 free inodes
> on 64k blocksize. The test then keeps adding new files to a directory to
> trigger an htree split. For 64k this takes more than the total free
> inodes, which causes touch to return -ENOSPC. This leads to the while
> loop in induce_node_split() to never finish.
>
> To fix this:
> 1. Format a 1G FS which gives us atleast 16K inodes to work with.
> 2. _fail if there's any error while trying to induce node split, so we
> dont get stuck in loop
>
> Fixes: 466ddbfd1151 ("ext4: add test for ext4_dir_entry2 wipe")
> Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
> ---

Yeah, I also hit this issue when testing LBS — file creation kept failing
without breaking out of the loop, which resulted in the test case spinning
endlessly.

Looks good to me. Feel free to add:

Reviewed-by: Baokun Li <libaokun1@huawei.com>

> tests/ext4/048 | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/tests/ext4/048 b/tests/ext4/048
> index 2031c8c8..6343ff3a 100755
> --- a/tests/ext4/048
> +++ b/tests/ext4/048
> @@ -69,6 +69,11 @@ induce_node_split() {
> while [[ "$(stat --printf="%s" $testdir)" == "$dir_size" ]]; do
> file_num=$(($file_num + 1))
> touch $testdir/test"$(printf "%04d" $file_num)"
> + local ret=$?
> + if [[ $ret -ne 0 ]]
> + then
> + _fail "ERROR induce_node_split(): $ret"
> + fi
> done
> _scratch_unmount >> $seqres.full 2>&1
> }
> @@ -81,7 +86,7 @@ test_file1="test0001"
> test_file2="test0002"
> test_file3="test0003"
>
> -_scratch_mkfs_sized $((128 * 1024 * 1024)) >> $seqres.full 2>&1
> +_scratch_mkfs_sized $((1 * 1024 * 1024 * 1024)) >> $seqres.full 2>&1
>
> # create scratch dir for testing
> # create some files with no name a substr of another name so we can grep later