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@mit.edu>

diff --git a/scrub/e2scrub_all.in b/scrub/e2scrub_all.in
index 8bc868aa0927d714b340b0fce09e8669587cf9b3..4cb90a0de4765f76821f0a89ac3ae00f85a021f8 100644 (file)
--- 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