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62575e270f
Some messages sent by the MDS entail a session sequence number
increment, and the MDS will drop certain types of requests on the floor
when the sequence numbers don't match.
In particular, a REQUEST_CLOSE message can cross with one of the
sequence morphing messages from the MDS which can cause the client to
stall, waiting for a response that will never come.
Originally, this meant an up to 5s delay before the recurring workqueue
job kicked in and resent the request, but a recent change made it so
that the client would never resend, causing a 60s stall unmounting and
sometimes a blockisting event.
Add a new helper for incrementing the session sequence and then testing
to see whether a REQUEST_CLOSE needs to be resent, and move the handling
of CEPH_MDS_SESSION_CLOSING into that function. Change all of the
bare sequence counter increments to use the new helper.
Reorganize check_session_state with a switch statement. It should no
longer be called when the session is CLOSING, so throw a warning if it
ever is (but still handle that case sanely).
[ idryomov: whitespace, pr_err() call fixup ]
URL: https://tracker.ceph.com/issues/47563
Fixes:
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|---|---|---|
| .. | ||
| acl.c | ||
| addr.c | ||
| cache.c | ||
| cache.h | ||
| caps.c | ||
| ceph_frag.c | ||
| debugfs.c | ||
| dir.c | ||
| export.c | ||
| file.c | ||
| inode.c | ||
| io.c | ||
| io.h | ||
| ioctl.c | ||
| ioctl.h | ||
| Kconfig | ||
| locks.c | ||
| Makefile | ||
| mds_client.c | ||
| mds_client.h | ||
| mdsmap.c | ||
| metric.c | ||
| metric.h | ||
| quota.c | ||
| snap.c | ||
| strings.c | ||
| super.c | ||
| super.h | ||
| util.c | ||
| xattr.c | ||