[RFC proxmox{,-backup} 0/6] add scheduled fstrim job for datastore's backing filesystems

[Christian Ebner <c.ebner@proxmox.com>]

As reported in the community forum [0], the default systemd service
to run fstrim does not cover datastores mounted via systemd mount
unit, since the fstrim command is invoked via:
```
fstrim --listed-in /etc/fstab:/proc/self/mountinfo ...
```
which however only considers the list up to the first non-empty
file according to the man page [1].

To allow for easy configuration of scheduled fstrims also on
filesystems backing datastores in PBS, implement a scheduled job
with per-datastore schedule configuration. Enable and default to
executing the fstrim job for new datastores (except crated via ZFS
dialog).

Open question remaining:
How to best handle datastores located on ZFS? Should the command default
to zpool trim? Should it set `autotrim=on` on datastore creation instead
and silently ignore as it is now?

[0] https://forum.proxmox.com/threads/181764/
[1] https://www.man7.org/linux/man-pages/man8/fstrim.8.html


proxmox:

Christian Ebner (1):
  pbs-api-types: define fstrim schedule on datastore config

 pbs-api-types/src/datastore.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)


proxmox-backup:

Christian Ebner (5):
  tools: add helper to run fstrim command on path or mountpoint
  api: config: expose fstrim schedule for datastores
  bin: proxy: periodically schedule fstrim on datastore's filesystems
  ui: expose per-datastore fstrim job schedule
  api: set default fstrim schedule on datastore create

 src/api2/config/datastore.rs     | 10 ++++++
 src/api2/node/disks/directory.rs |  6 ++--
 src/bin/proxmox-backup-proxy.rs  | 59 ++++++++++++++++++++++++++++++++
 src/tools/disks/mod.rs           | 10 ++++++
 www/Makefile                     |  1 +
 www/datastore/OptionView.js      |  7 ++++
 www/window/FstrimJobEdit.js      | 27 +++++++++++++++
 7 files changed, 118 insertions(+), 2 deletions(-)
 create mode 100644 www/window/FstrimJobEdit.js


Summary over all repositories:
  8 files changed, 134 insertions(+), 2 deletions(-)

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