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nfsd4: simplify reading of opnum

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The comment here is totally bogus:
	- OP_WRITE + 1 is RELEASE_LOCKOWNER.  Maybe there was some older
	  version of the spec in which that served as a sort of
	  OP_ILLEGAL?  No idea, but it's clearly wrong now.
	- In any case, I can't see that the spec says anything about
	  what to do if the client sends us less ops than promised.
	  It's clearly nutty client behavior, and we should do
	  whatever's easiest: returning an xdr error (even though it
	  won't be consistent with the error on the last op returned)
	  seems fine to me.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2012-11-16 22:28:38 -05:00
parent 447bfcc936
commit 8a61b18c9b
1 changed files with 2 additions and 32 deletions
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34
fs/nfsd/nfs4xdr.c
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@ -1624,38 +1624,8 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
op = &argp->ops[i];
op->replay = NULL;
/*
* We can't use READ_BUF() here because we need to handle
* a missing opcode as an OP_WRITE + 1. So we need to check
* to see if we're truly at the end of our buffer or if there
* is another page we need to flip to.
*/
if (argp->p == argp->end) {
if (argp->pagelen < 4) {
/* There isn't an opcode still on the wire */
op->opnum = OP_WRITE + 1;
op->status = nfserr_bad_xdr;
argp->opcnt = i+1;
break;
}
/*
* False alarm. We just hit a page boundary, but there
* is still data available. Move pointer across page
* boundary. *snip from READ_BUF*
*/
argp->p = page_address(argp->pagelist[0]);
argp->pagelist++;
if (argp->pagelen < PAGE_SIZE) {
argp->end = argp->p + (argp->pagelen>>2);
argp->pagelen = 0;
} else {
argp->end = argp->p + (PAGE_SIZE>>2);
argp->pagelen -= PAGE_SIZE;
}
}
op->opnum = ntohl(*argp->p++);
READ_BUF(4);
READ32(op->opnum);
if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
op->status = ops->decoders[op->opnum](argp, &op->u);