[LTP] [PATCH v1] ext4_subdir_limit_test.sh: fix "No Space" issue

[Petr Vorel]

Hi Xiaoli,

> From: Xiaoli Feng <fengxiaoli0714@gmail.com>

> 1G ext4 filesystem default has 65536 inode. And some inodes
> will be used after format. So it will be failed when try to
> create 65536 sub-directorys in this ext4 mountpoint. Change
> it to create 65536 - used inodes directorys.
> ---

> Re-send this mail again. Because I subscripted the ltp mail list failed last
> time.
We got your patch twice, even into patchwork ([1]). I disabled the first patch
in patchwork.

...
> +++ b/testcases/kernel/fs/ext4-new-features/ext4-subdir-limit/ext4_subdir_limit_test.sh
> @@ -46,6 +46,8 @@ prev_result=$FAIL
>  ext4_run_case()
>  {
>  	local dir_name_len=
> +	local free_inode=
> +	local max_directorys=$1
max_directories, please (or better max_dirs) :).

>  	if [ $2 -eq $SHORT_DIR ]; then
>  		dir_name_len="short name"
> @@ -53,9 +55,6 @@ ext4_run_case()
>  		dir_name_len="long name"
>  	fi

> -	tst_resm TINFO "Num of dirs to create: $1, Dir name len: $dir_name_len, " \
> -			"Parent dir: $3, Block size: $4"
> -
>  	# only mkfs if block size has been changed,
>  	# or previous case failed
>  	if [ $prev_result -ne $PASS -o $4 -ne $prev_block_size ]; then
> @@ -80,11 +79,18 @@ ext4_run_case()

>  	# create directories
>  	mkdir -p $3 2> /dev/null
> +	free_inode=`df -i $EXT4_DEV | awk '{print $4}' | tr -cd "[0-9]"`
How about using tail instead of tr?
df -i $EXT4_DEV | tail -1 | awk '{print $4}'

Maybe tail is more reliable and readable (and available [*]) than tr.

Not, sure if this is a correct usage:
# dd if=/dev/zero of=test_file bs=5000MB count=1
# /opt/ltp/runltp -f fs_ext4 -z /root/test_file
but in this case is zero Inodes:

Filesystem     Inodes IUsed IFree IUse% Mounted on
/dev/vda2           0     0     0     - /

[*]: In new API it's needed to specify required commands in TST_NEEDS_CMDS
variable (i.e. TST_NEEDS_CMDS="tr"), but this is legacy API, which does not have
it.

> +	if [ "$free_inode" -lt "$1" ]; then
I guess here you should use $max_directorys instead of $1
> +		max_directorys=$free_inode
> +	fi
> +
> +	tst_resm TINFO "Num of dirs to create: $max_directorys, Dir name len: $dir_name_len, " \
> +			"Parent dir: $3, Block size: $4"

>  	if [ $2 -eq $SHORT_DIR ]; then
> -		create_short_dirs $1 $3
> +		create_short_dirs $max_directorys $3
Ad $3: I hate using direct positional variables, but that's not related to the
fix. Whole ext4-new-features tests would deserve rewrite into new API and
cleanup (big work due they all depend on ext4_funcs.sh).


Kind regards,
Petr

[1] https://patchwork.ozlabs.org/patch/1080619/