Package: btrfs-progs Version: 5.3.1-1 Severity: minor The new checks at mount time cause mount times for large filesystems to be much longer. My roughly 10TB filesystem now takes over 90 seconds to mount.
Unfortunately, this is longer than the default systemd mount timer and systemd assumes the mount has failed (and, in fact, cancels it). If the mount is not marked with "nofail" this causes boot to fail and to drop into the rescue console. This new checking is a good thing, and neither the new checks, nor the systemd behaviour are bugs, nor are they the responsibility of btrfs-progs. It is likely that users of large btrfs filesystems will have btrfs-progs installed. So, I believe it would be extremely useful to add a NEWS item to the next btrfs-progs package release to warn btrfs users of this change and recommend that they consider making changes to /etc/fstab for any btrfs volumes mounted at boot time. Alternatively, the NEWS item could be included in the kernel release, however that would target a much larger group of people than just btrfs users. A release notes entry for bullseye should also be considered. Suggested NEWS text: BTRFS filesystems are now checked for tree corruption at mount time. For filesystems of around 10TB or larger, this is likely to cause the mount time to exceed the default systemd mount timeout of 90 seconds. If the filesystem is mounted at boot time, and not marked as "nofail", this will cause the boot to fail. The systemd mount timeout can be increased in /etc/fstab by setting the mount option x-systemd.mount-timeout= with a new timeout value in seconds. See systemd.mount(5) for full documentation on the systemd mount options that can be specified in /etc/fstab. -- System Information: Debian Release: bullseye/sid APT prefers testing APT policy: (900, 'testing') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 5.4.0-4-amd64 (SMP w/4 CPU cores) Locale: LANG=en_IE.utf8, LC_CTYPE=en_IE.utf8 (charmap=UTF-8) (ignored: LC_ALL set to en_IE.utf8), LANGUAGE=en_IE.utf8 (charmap=UTF-8) (ignored: LC_ALL set to en_IE.utf8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages btrfs-progs depends on: ii libblkid1 2.34-0.1 ii libc6 2.29-7 ii libcom-err2 1.45.4-1 ii libext2fs2 1.45.4-1 ii liblzo2-2 2.10-0.1 ii libuuid1 2.34-0.1 ii libzstd1 1.4.4+dfsg-1 ii zlib1g 1:1.2.11.dfsg-1+b1 btrfs-progs recommends no packages. Versions of packages btrfs-progs suggests: pn duperemove <none> -- no debconf information
