nfsd: don't thrash the cl_lock while freeing an open stateid

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When we remove the client_mutex, we'll have a potential race between
FREE_STATEID and CLOSE.

The root of the problem is that we are walking the st_locks list,
dropping the spinlock and then trying to release the persistent
reference to the lockstateid. In between, a FREE_STATEID call can come
along and take the lock, find the stateid and then try to put the
reference. That leads to a double put.

Fix this by not releasing the cl_lock in order to release each lock
stateid. Use put_generic_stateid_locked to unhash them and gather them
onto a list, and free_ol_stateid_reaplist to free any that end up on the
list.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

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Jeff Layton 2014-07-29 21:34:42 -04:00 • committed by J. Bruce Fields

parent 2c41beb0e5

commit d83017f94c

1 changed files with 19 additions and 15 deletions

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fs/nfsd/nfs4state.c

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