[pbs-devel] [PATCH v2 proxmox-backup 0/5] fix #5853: ignore stale files

[Christian Ebner]

When files and their associated metadata get invalidated, I/O
operations on network filesystems return ESTALE to indicate that the
filehandle does not reference a valid file anymore.

Currently, the proxmox-backup-client does not cover such cases, it
will fail with a hard error when a stale file handle is encountered.
Any concurrent operation invalidating file handles has the potential
to lead to the backups failing if timed accordingly. For local
filesystems this is not an issue, as the file remains accessible
until the file handle is closed.

Make the backup client more resilient by handling the ESTALE errors
gracefully, warning the user about the vanished/invalidated files,
while generating a valid and consistent backup archive nevertheless.

Changes since version 1:
- Avoid tuples in return values by downcasting anyhow::Error to Errno
  when latter is required
- Add report stale file handle helper
- Refactor report vanished/changed file helpers

Christian Ebner (5):
  client: pxar: refactor report vanished/changed helpers
  client: pxar: skip directories on stale file handle
  client: pxar: skip directory entries on stale file handle
  client: pxar: warn user and ignore stale file handles on file open
  fix #5853: client: pxar: exclude stale files on metadata/link read

 pbs-client/src/pxar/create.rs | 94 +++++++++++++++++++++++++----------
 1 file changed, 69 insertions(+), 25 deletions(-)

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2.39.5