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authorAndy Adamson <andros@netapp.com>2013-05-08 16:21:18 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-05-08 17:19:32 -0400
commitc23266d532b4de796a346f57a66587c5db17d27e (patch)
treeff380244bcc16957bb0849cac47d5383a2b710af /net/sunrpc/clnt.c
parentd497ab975141666e674e7bd8729e00095ec23c9d (diff)
downloadlinux-c23266d532b4de796a346f57a66587c5db17d27e.tar.bz2
NFS4.1 Fix data server connection race
Unlike meta data server mounts which support multiple mount points to the same server via struct nfs_server, data servers support a single connection. Concurrent calls to setup the data server connection can race where the first call allocates the nfs_client struct, and before the cache struct nfs_client pointer can be set, a second call also tries to setup the connection, finds the already allocated nfs_client, bumps the reference count, re-initializes the session,etc. This results in a hanging data server session after umount. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/clnt.c')
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