[pbs-devel] [PATCH proxmox-backup] etc: provide and enable mount unit for /run/proxmox-backup

[Christian Ebner]

Since the introduction of per-chunk file locks for datastores with s3
backend, the inodes on the tmpfs backing /run/proxmox-backup might be
to limited, the kernel dynamically calculating the limit based on
available system memory [0]. To not limit the number of inodes,
provide a systemd mount unit to create a dedicated tmpfs for
/run/proxmox-backup and only enable this for now so it becomes
effective on reboot, since this cannot be safely started now.

[0] https://docs.kernel.org/filesystems/tmpfs.html

Fixes: https://forum.proxmox.com/threads/176228/
Signed-off-by: Christian Ebner <c.ebner at proxmox.com>
---
 debian/postinst                      |  2 ++
 debian/proxmox-backup-server.install |  1 +
 "etc/run-proxmox\\x2dbackup.mount"   | 13 +++++++++++++
 3 files changed, 16 insertions(+)
 create mode 100644 "etc/run-proxmox\\x2dbackup.mount"

diff --git a/debian/postinst b/debian/postinst
index 8b5e9bbed..0fddfbd99 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -25,6 +25,8 @@ case "$1" in
 	fi
 	deb-systemd-invoke $_dh_action proxmox-backup.service proxmox-backup-proxy.service >/dev/null || true
 
+	systemctl enable run-proxmox\\x2dbackup.mount >/dev/null || true
+
 	if test -n "$2"; then
 		# FIXME: Remove in future version once we're sure no broken entries remain in anyone's files
 		if grep -q -e ':termproxy::[^@]\+: ' /var/log/proxmox-backup/tasks/active; then
diff --git a/debian/proxmox-backup-server.install b/debian/proxmox-backup-server.install
index d06f026cf..11dd037e8 100644
--- a/debian/proxmox-backup-server.install
+++ b/debian/proxmox-backup-server.install
@@ -6,6 +6,7 @@ etc/proxmox-backup-daily-update.timer /usr/lib/systemd/system/
 etc/proxmox-backup-proxy.service /usr/lib/systemd/system/
 etc/proxmox-backup.service /usr/lib/systemd/system/
 etc/removable-device-attach at .service /usr/lib/systemd/system/
+etc/run-proxmox\x2dbackup.mount /usr/lib/systemd/system/
 usr/bin/pmt
 usr/bin/pmtx
 usr/bin/proxmox-tape
diff --git "a/etc/run-proxmox\\x2dbackup.mount" "b/etc/run-proxmox\\x2dbackup.mount"
new file mode 100644
index 000000000..f5fbe2eb4
--- /dev/null
+++ "b/etc/run-proxmox\\x2dbackup.mount"
@@ -0,0 +1,13 @@
+[Unit]
+Description=Mount tmpfs at /run/proxmox-backup
+Conflicts=umount.target
+Before=local-fs.target umount.target
+
+[Mount]
+Type=tmpfs
+What=tmpfs
+Where=/run/proxmox-backup
+Options=rw,nosuid,nodev,noexec,relatime,nr_inodes=0,mode=755,inode64
+
+[Install]
+WantedBy=local-fs.target
-- 
2.47.3