From: J. Bruce Fields Date: Mon, 19 May 2014 16:27:11 +0000 (-0400) Subject: nfsd4: decoding errors can still be cached and require space X-Git-Tag: firefly_0821_release~176^2~3796^2~74 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e372ba60def1af33e1c0b9bbfa5c8f8559c1ad6b;p=firefly-linux-kernel-4.4.55.git nfsd4: decoding errors can still be cached and require space Currently a non-idempotent op reply may be cached if it fails in the proc code but not if it fails at xdr decoding. I doubt there are any xdr-decoding-time errors that would make this a problem in practice, so this probably isn't a serious bug. The space estimates should also take into account space required for encoding of error returns. Again, not a practical problem, though it would become one after future patches which will tighten the space estimates. Signed-off-by: J. Bruce Fields --- diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 9d60a1c08105..b0e075cd6c99 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1215,6 +1215,8 @@ static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op) bool nfsd4_cache_this_op(struct nfsd4_op *op) { + if (op->opnum == OP_ILLEGAL) + return false; return OPDESC(op)->op_flags & OP_CACHEME; } diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 18881f34737a..e866a06b66bd 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1677,11 +1677,6 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp) op->opnum = OP_ILLEGAL; op->status = nfserr_op_illegal; } - - if (op->status) { - argp->opcnt = i+1; - break; - } /* * We'll try to cache the result in the DRC if any one * op in the compound wants to be cached: @@ -1689,6 +1684,11 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp) cachethis |= nfsd4_cache_this_op(op); max_reply = max(max_reply, nfsd4_max_reply(op->opnum)); + + if (op->status) { + argp->opcnt = i+1; + break; + } } /* Sessions make the DRC unnecessary: */ if (argp->minorversion)