[pbs-devel] [PATCH proxmox-backup v2 0/4] refactor datastore locking to use tmpfs

[Stefan Sterz <s.sterz@proxmox.com>]

This series refactors the locking mechanism inside the `DataStore`
trait. In a first step locking methods are added and the existing
code is refactored to use them. The second commit then adds double
stat'ing and adds lock files under '/run' for each group/snapshot.

The third commit refactors locking for manifests and brings it in-line
with the group/snapshot locks. Finally the fourth commit fixes a race
condition when changing the owner of a datastore.

changes from v1 (thanks @ Wolfgang Bumiller & Thomas Lamprecht):

* split adding locking helpers and move '/run' into two commits
* instead of stat'ing the path of lock file twice, only use the file
  descriptor for one of the stat'ing procedures instead
* several improvements to helper functions and documentation

Stefan Sterz (4):
  fix #3935: datastore/api/backup: add locking helpers to datastore
  fix #3935: datastore/api/backup: move datastore locking to '/run'
  fix #3935: datastore: move manifest locking to new locking method
  fix: api: avoid race condition in set_backup_owner

 pbs-config/src/lib.rs                |   7 +
 pbs-datastore/src/datastore.rs       | 190 +++++++++++++++++++--------
 pbs-datastore/src/snapshot_reader.rs |  30 +++--
 src/api2/admin/datastore.rs          |   9 +-
 src/api2/backup/environment.rs       |   4 +-
 src/api2/backup/mod.rs               |   4 +-
 src/api2/reader/mod.rs               |   7 +-
 src/backup/verify.rs                 |  12 +-
 8 files changed, 180 insertions(+), 83 deletions(-)

-- 
2.30.2