[pbs-devel] [PATCH v4 proxmox-backup 0/6] closes #3071: maintenance mode for datastore

[Hannes Laimer]

Adds maintenance mode and tracking of active reading/writing operations.
The maintenance mode prevents the start of new operations if the type of
operation they would perform on the datastore would conflict with the
maintenance type that is currently set. This check is performed when
lookup_datastore is called. Tasks only call this function once at the
beginning, therefore updating the maintenance type cannot interfere with
already running tasks.

active operations tracking:
Changed file layout to now also keep track of the pid and the counts of
operations that that pid started, like this it is possible to not count
operations that were started by a dead process, since they are also not
active anymore. Whenever the file is updated, also entries of dead
processes are removed. When the file is read, only entries of active
processes are counted.

The UI shows a spinner with the count of conflictintg tasks (the tasks
that were started before the maintenance type was updated) next to it.
As soon as all conflicting tasks are finished a checkmark appears.


v4:
 - clones are not also tracked
 - use lockfile, instead of locking the file
 - track pid of the process which started smth
 - updating maintenance mode is now always possible
 - add get_active_operations endpoint for datastore
 - ui: show count of conflicting tasks (or checkmark if no conflicting
     operations are active)

 v3, based on Dominik Csapak <d.csapak at proxmox.com>'s feedback:
 - added Operation enum(r/w), as suggested by
 - added active operation tracking
 - combine type and message into on field

v2:
 - check for maintenance now directly in lookup_datastore
 - parameter for checking is now the last acceptable maintenance type,
   description in commit msg of 2nd patch
 - ui cleanup

Hannes Laimer (6):
  pbs-api-types: add maintenance type
  pbs-datastore: add check for maintenance in lookup
  pbs-datastore: add active operations tracking
  api2: make maintenance_type updatable
  api2: add get_active_operations endpoint
  ui: add option to change the maintenance type

 pbs-api-types/src/datastore.rs       |   8 +-
 pbs-api-types/src/lib.rs             |   3 +
 pbs-api-types/src/maintenance.rs     |  83 ++++++++++
 pbs-datastore/Cargo.toml             |   1 +
 pbs-datastore/src/datastore.rs       | 222 +++++++++++++++++++++++----
 pbs-datastore/src/lib.rs             |   5 +-
 pbs-datastore/src/snapshot_reader.rs |   6 +-
 src/api2/admin/datastore.rs          |  79 +++++++---
 src/api2/backup/mod.rs               |   4 +-
 src/api2/config/datastore.rs         |   5 +
 src/api2/pull.rs                     |   4 +-
 src/api2/reader/mod.rs               |   6 +-
 src/api2/status.rs                   |   4 +-
 src/api2/tape/backup.rs              |   6 +-
 src/api2/tape/restore.rs             |   6 +-
 src/bin/proxmox-backup-api.rs        |   1 +
 src/bin/proxmox-backup-proxy.rs      |   6 +-
 src/server/mod.rs                    |  16 +-
 src/server/prune_job.rs              |   4 +-
 src/server/verify_job.rs             |   4 +-
 www/Makefile                         |   1 +
 www/Utils.js                         |  23 +++
 www/datastore/OptionView.js          |  30 ++++
 www/window/MaintenanceOptions.js     |  72 +++++++++
 24 files changed, 517 insertions(+), 82 deletions(-)
 create mode 100644 pbs-api-types/src/maintenance.rs
 create mode 100644 www/window/MaintenanceOptions.js

-- 
2.30.2