[systemd-devel] [PATCHv6 0/3] hibernate-resume: implement support for resuming from hibernation
lennart at poettering.net
Tue Aug 26 13:21:59 PDT 2014
On Wed, 27.08.14 00:17, Ivan Shapovalov (intelfx100 at gmail.com) wrote:
Applied all three! Thanks!
> This patchset allows systemd to parse resume= kernel command line parameter
> and initiate resume from the specified device.
> It adds:
> - a 'systemd-hibernate-resume' tool which takes path to a device node and
> writes its major:minor to /sys/power/resume;
> - a corresponding 'systemd-hibernate-resume at .service' templated unit;
> - a 'systemd-hibernate-resume-generator' generator which parses the kernel
> command line and instantiates the unit as necessary.
> This functionality already exists in-kernel, but only for "/dev/sdXY"-style
> pathes. Implementing it in userspace allows to use arbitrary udev-created
> symlinks, e. g. persistent block device pathes ("/dev/disk/by-foo/bar") or
> fstab-like specifiers ("FOO=bar").
> Userspace parsing of resume= kernel command line parameter has been
> traditionally done in initramfs via shell scripts (for Arch Linux, this is
> "resume" mkinitcpio hook), so I feel that this feature has its place within
> Due to the nature of hibernation, the resume unit must be activated before
> any modifications to filesystems take place. This can happen only in initramfs
> before mounting anything.
> So, first patch orders all non-root fsck after local-fs-pre.target, which in
> turn allows to order the resume unit before those fsck instances.
> Second and third patches add the tool, the unit and the generator.
> Thanks for reviewing!
> v2: fix issues pointed out by Andrei:
> - don't RemainAfterExit because it's useless
> - don't attempt to resume outside of initramfs because it's unsafe
> (reiserfs replays journal even if mounted RO)
> v3: fix mistakes spotted by Thomas:
> - return 0 in main path of resume.c:process_resume()
> - fix type and add missing cleanup attribute in resume-generator.c:main()
> v4: drop the [RFC] prefix as there are no more issues with this approach;
> incorporate feedback from Lennart:
> - fix indentation in resume-generator.c:parse_proc_cmdline_item()
> - remove overly aggressive 80-column line breaks
> - don't Before=usr.mount and After=systemd-udevd.service
> as the respective configurations are deemed broken
> - reword the "Failed to resume" message and downgrade it to log_info()
> v5: add the binaries and preprocessed unit to respective .gitignore files
> incorporate feedback from Lennart:
> - rename systemd-resume-* to systemd-hibernate-resume-*
> incorporate feedback from Dave:
> - use fstab_node_to_udev_node() in the generator to also handle fstab-like
> v6: rebase against master
> Ivan Shapovalov (3):
> units: order systemd-fsck at .service after local-fs-pre.target.
> hibernate-resume: add a tool to write a device node's major:minor to /sys/power/resume.
> hibernate-resume-generator: add a generator for instantiating the resume unit.
> .gitignore | 2 +
> Makefile-man.am | 9 +++
> Makefile.am | 28 +++++++--
> man/kernel-command-line.xml | 14 ++++-
> man/systemd-hibernate-resume-generator.xml | 93 +++++++++++++++++++++++++++++
> man/systemd-hibernate-resume at .service.xml | 81 +++++++++++++++++++++++++
> src/hibernate-resume/Makefile | 1 +
> src/hibernate-resume/hibernate-resume.c | 81 +++++++++++++++++++++++++
> src/resume-generator/Makefile | 1 +
> src/resume-generator/resume-generator.c | 95 ++++++++++++++++++++++++++++++
> units/.gitignore | 1 +
> units/systemd-fsck at .service.in | 2 +-
> units/systemd-hibernate-resume at .service.in | 20 +++++++
> 13 files changed, 422 insertions(+), 6 deletions(-)
> create mode 100644 man/systemd-hibernate-resume-generator.xml
> create mode 100644 man/systemd-hibernate-resume at .service.xml
> create mode 120000 src/hibernate-resume/Makefile
> create mode 100644 src/hibernate-resume/hibernate-resume.c
> create mode 120000 src/resume-generator/Makefile
> create mode 100644 src/resume-generator/resume-generator.c
> create mode 100644 units/systemd-hibernate-resume at .service.in
Lennart Poettering, Red Hat
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