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

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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@xxxxxxx>
---
 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@/e2scrub.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




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