NFSD: Clean up legacy NFS SYMLINK argument XDR decoders
Move common code in NFSD's legacy SYMLINK decoders into a helper.
The immediate benefits include:
- one fewer data copies on transports that support DDP
- consistent error checking across all versions
- reduction of code duplication
- support for both legal forms of SYMLINK requests on RDMA
transports for all versions of NFS (in particular, NFSv2, for
completeness)
In the long term, this helper is an appropriate spot to perform a
per-transport call-out to fill the pathname argument using, say,
RDMA Reads.
Filling the pathname in the proc function also means that eventually
the incoming filehandle can be interpreted so that filesystem-
specific memory can be allocated as a sink for the pathname
argument, rather than using anonymous pages.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 7cbc129..468020f 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -110,6 +110,7 @@ struct nfsd4_create {
struct {
u32 datalen;
char *data;
+ struct kvec first;
} link; /* NF4LNK */
struct {
u32 specdata1;
@@ -124,6 +125,7 @@ struct nfsd4_create {
};
#define cr_datalen u.link.datalen
#define cr_data u.link.data
+#define cr_first u.link.first
#define cr_specdata1 u.dev.specdata1
#define cr_specdata2 u.dev.specdata2
