linux-ext4 - Re: [PATCH 7/9] e2scrub_all: make sure there's enough free space for a snapshot

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Date:   Wed, 20 Mar 2019 21:02:42 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     "Theodore Ts'o" <tytso@....edu>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 7/9] e2scrub_all: make sure there's enough free space for
 a snapshot

On Wed, Mar 20, 2019 at 10:02:16PM -0400, Theodore Ts'o wrote:
> If there isn't, skip the volume so we don't spam the system
> administrator with error messages.  It's quite commkon that there is

'common'

> is zero free space in the volume group.
> 
> Addresses-Debian-Bug: #924301
> 
> Signed-off-by: Theodore Ts'o <tytso@....edu>

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

--D

> ---
>  scrub/e2scrub_all.in | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/scrub/e2scrub_all.in b/scrub/e2scrub_all.in
> index 8bc868aa0..4cb90a0de 100644
> --- a/scrub/e2scrub_all.in
> +++ b/scrub/e2scrub_all.in
> @@ -21,6 +21,7 @@
>  PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
>  
>  scrub_all=0
> +snap_size_mb=256
>  conffile="@root_sysconfdir@...scrub.conf"
>  
>  test -f "${conffile}" && . "${conffile}"
> @@ -108,6 +109,9 @@ ls_scrub_targets() {
>  		eval "${lvm_vars}"
>  		echo "${LVM2_LV_ROLE}" | grep -q "snapshot" && continue
>  
> +		free_space="$(vgs -o vg_free --units m --noheadings --no-suffix "${LVM2_VG_NAME}" 2> /dev/null | sed -e 's/\..*//')"
> +		test "${snap_size_mb}" -gt "${free_space}" && continue
> +
>  		if [ -n "${MOUNTPOINT}" ]; then
>  			echo "${MOUNTPOINT}"
>  		else
> -- 
> 2.19.1
>