[pbs-devel] [PATCH proxmox{, -backup} 0/2] Move ProcessLocker to tmpfs

[Gabriel Goller]

Submitted a new patch!

On 12/4/23 14:18, Gabriel Goller wrote:
> This moves the `ProcessLocker`'s `.lock` file to `/run/proxmox-backup/locks` (tmpfs).
>
> The first patch only converts all the `F_SETLK` flags to `F_OFD_SETLK` flags. This
> changes normal locks, which are based on the process, to locks based on an open file
> descriptor. This actually doesn't change anything, because we use mutexes, so the
> lock is already thread-safe. It would be cleaner though and would safe us from
> weird quirks like closing the lock-file which would drop all the locks when using
> the POSIX `F_SETLK`. See more here [0].
>
> The second patch changes the location of the `.lock` file to the `/run/proxmox-backup/locks`
> tmpfs directory. Like this we don't need to lazy-lock anything and we can keep the lockfile
> open all the time. Unmounting datastores is now possible as the lock file is not on the
> datastore mount anymore.
>
> Another thing is noticed is that datastores that are not available (e.g. have been unmounted)
> don't display an error on the ui. That means the only way to see if a datastore is online is
> to either start a gc or verify run. An idea for a future patch would be to check if the
> datastore exists and (maybe) even automatically set the maintenance mode to `offline` if it
> doesn't exist?
>
> [0]: https://man7.org/linux/man-pages/man2/fcntl.2.html
>
>
>
> proxmox:
>
> Gabriel Goller (1):
>    process_locker: use ofd locking
>
>   proxmox-sys/src/process_locker.rs | 20 ++++++++++----------
>   1 file changed, 10 insertions(+), 10 deletions(-)
>
>
> proxmox-backup:
>
> Gabriel Goller (1):
>    datastore: store datastore lock on tmpfs
>
>   pbs-datastore/src/chunk_store.rs | 11 +++++++----
>   1 file changed, 7 insertions(+), 4 deletions(-)
>
>
> Summary over all repositories:
>    2 files changed, 17 insertions(+), 14 deletions(-)
>