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

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Date:   Wed, 20 Mar 2019 22:02:16 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:     darrick.wong@...cle.com, "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 7/9] e2scrub_all: make sure there's enough free space for a snapshot

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
is zero free space in the volume group.

Addresses-Debian-Bug: #924301

Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 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