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[ Upstream commit e0aa651068 ]
We had a report of this:
BUG: sleeping function called from invalid context at fs/nfsd/filecache.c:440
...with a stack trace showing nfsd_file_put being called from
nfs4_show_open. This code has always tried to call fput while holding a
spinlock, but we recently changed this to use the filecache, and that
started triggering the might_sleep() in nfsd_file_put.
states_start takes and holds the cl_lock while iterating over the
client's states, and we can't sleep with that held.
Have the various nfs4_show_* functions instead hold the fi_lock instead
of taking a nfsd_file reference.
Fixes: 78599c42ae ("nfsd4: add file to display list of client's opens")
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2138357
Reported-by: Zhi Li <yieli@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
435cc7d18c