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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 21 Mar 2019 16:25:11 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:     darrick.wong@...cle.com, lczerner@...hat.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