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ceph: auto reconnect after blacklisted

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Make client use osd reply and session message to infer if itself is
blacklisted. Client reconnect to cluster using new entity addr if it
is blacklisted. Auto reconnect is limited to once every 30 minutes.

Auto reconnect is disabled by default. It can be enabled/disabled by
recover_session=<no|clean> mount option. In 'clean' mode, client drops
any dirty data/metadata, invalidates page caches and invalidates all
writable file handles. After reconnect, file locks become stale because
MDS loses track of them. If an inode contains any stale file locks,
read/write on the indoe are not allowed until applications release all
stale file locks.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng
2019-07-25 20:16:47 +08:00
committed by Ilya Dryomov
parent 81f148a910
commit 131d7eb4fa
6 changed files with 93 additions and 8 deletions
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14
Documentation/filesystems/ceph.txt
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@@ -158,6 +158,20 @@ Mount Options
copies. Currently, it's only used in copy_file_range, which will revert
to the default VFS implementation if this option is used.
recover_session=<no|clean>
Set auto reconnect mode in the case where the client is blacklisted. The
available modes are "no" and "clean". The default is "no".
* no: never attempt to reconnect when client detects that it has been
blacklisted. Operations will generally fail after being blacklisted.
* clean: client reconnects to the ceph cluster automatically when it
detects that it has been blacklisted. During reconnect, client drops
dirty data/metadata, invalidates page caches and writable file handles.
After reconnect, file locks become stale because the MDS loses track
of them. If an inode contains any stale file locks, read/write on the
inode is not allowed until applications release all stale file locks.
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