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authorChuck Lever <chuck.lever@oracle.com>2015-01-13 17:03:53 +0100
committerJ. Bruce Fields <bfields@redhat.com>2015-01-15 21:01:49 +0100
commita97c331f9aa9080706a7835225d9d82e832e0bb6 (patch)
treeac442b57bd53c60018c7a808a8f9101a70db3a6b /COPYING
parentsvcrdma: Move read list XDR round-up logic (diff)
downloadlinux-a97c331f9aa9080706a7835225d9d82e832e0bb6.tar.xz
linux-a97c331f9aa9080706a7835225d9d82e832e0bb6.zip
svcrdma: Handle additional inline content
Most NFS RPCs place their large payload argument at the end of the RPC header (eg, NFSv3 WRITE). For NFSv3 WRITE and SYMLINK, RPC/RDMA sends the complete RPC header inline, and the payload argument in the read list. Data in the read list is the last part of the XDR stream. One important case is not like this, however. NFSv4 COMPOUND is a counted array of operations. A WRITE operation, with its large data payload, can appear in the middle of the compound's operations array. Thus NFSv4 WRITE compounds can have header content after the WRITE payload. The Linux client, for example, performs an NFSv4 WRITE like this: { PUTFH, WRITE, GETATTR } Though RFC 5667 is not precise about this, the proper way to convey this compound is to place the GETATTR inline, _after_ the front of the RPC header. The receiver inserts the read list payload into the XDR stream after the initial WRITE arguments, and before the GETATTR operation, thanks to the value of the read list "position" field. The Linux client currently sends the GETATTR at the end of the RPC/RDMA read list, which is incorrect. It will be corrected in the future. The Linux server currently rejects NFSv4 compounds with inline content after the read list. For the above NFSv4 WRITE compound, the NFS compound header indicates there are three operations, but the server finds nonsense when it looks in the XDR stream for the third operation, and the compound fails with OP_ILLEGAL. Move trailing inline content to the end of the XDR buffer's page list. This presents incoming NFSv4 WRITE compounds to NFSD in the same way the socket transport does. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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