Messages in this thread | | | Date | Thu, 6 Nov 2003 20:10:51 -0800 | From | Kris Kennaway <> | Subject | NFS Locking violates protocol spec (incompatible with FreeBSD) |
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Hello,
In http://lxr.linux.no/source/include/linux/lockd/xdr.h?v=2.6.0-test7 can be found the following comment:
35 /* 36 * NLM cookies. Technically they can be 1K, Nobody uses over 8 bytes 37 * however. 38 */ 39 40 struct nlm_cookie 41 { 42 unsigned char data[8]; 43 unsigned int len; 44 };
Unfortunately, this is incorrect: FreeBSD 5.x's rpc.lockd uses a 16 byte cookie, and therefore FreeBSD 5.x NFS clients cannot interoperate with Linux when NFS locking is enabled.
http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/56461
contains more details about this problem, including a workaround for FreeBSD to limit the cookie size to 8 bytes. Obviously, it would be better for this bug to be fixed in Linux, since Linux is non-conformant to the protocol.
Kris
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