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authorChuck Lever <chuck.lever@oracle.com>2016-07-13 16:40:14 -0400
committerJ. Bruce Fields <bfields@redhat.com>2016-07-15 15:31:31 -0400
commit885848186fbc2d1d8fb6d2fdc2156638ae289a46 (patch)
treee027bde79fc5704a6e462466d344336bd83b704b /fs/nfsd/export.c
parentdd51db188600c8c54c46cff84e83358ece8ccb4d (diff)
downloadlinux-885848186fbc2d1d8fb6d2fdc2156638ae289a46.tar.bz2
nfsd: Close race between nfsd4_release_lockowner and nfsd4_lock
nfsd4_release_lockowner finds a lock owner that has no lock state, and drops cl_lock. Then release_lockowner picks up cl_lock and unhashes the lock owner. During the window where cl_lock is dropped, I don't see anything preventing a concurrent nfsd4_lock from finding that same lock owner and adding lock state to it. Move release_lockowner() into nfsd4_release_lockowner and hang onto the cl_lock until after the lock owner's state cannot be found again. Found by inspection, we don't currently have a reproducer. Fixes: 2c41beb0e5cf ("nfsd: reduce cl_lock thrashing in ... ") Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/export.c')
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