Refactor for clarity.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfsd/nfs4xdr.c | 64 ++++++++++++++++++++++++++++++--------------
include/linux/sunrpc/xdr.h | 21 ++++++++++++++
2 files changed, 64 insertions(+), 21 deletions(-)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index a7c9a0368951..94219ceb2ea2 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -780,6 +780,48 @@ nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
}
+static __be32
+nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
+ struct nfsd4_lock *lock)
+{
+ __be32 status;
+
+ if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
+ return nfserr_bad_xdr;
+ status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
+ if (status)
+ return status;
+ if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
+ return nfserr_bad_xdr;
+ return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
+ &lock->lk_new_owner);
+}
+
+static __be32
+nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
+ struct nfsd4_lock *lock)
+{
+ __be32 status;
+
+ status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
+ if (status)
+ return status;
+ if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
+ return nfserr_bad_xdr;
+
+ return nfs_ok;
+}
+
+static __be32
+nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
+{
+ if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
+ return nfserr_bad_xdr;
+ if (lock->lk_is_new)
+ return nfsd4_decode_open_to_lock_owner4(argp, lock);
+ return nfsd4_decode_exist_lock_owner4(argp, lock);
+}
+
static __be32
nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
{
@@ -795,27 +837,7 @@ nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
lock->lk_reclaim = be32_to_cpup(p++);
p = xdr_decode_hyper(p, &lock->lk_offset);
p = xdr_decode_hyper(p, &lock->lk_length);
- lock->lk_is_new = be32_to_cpup(p++);
-
- if (lock->lk_is_new) {
- READ_BUF(4);
- lock->lk_new_open_seqid = be32_to_cpup(p++);
- status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
- if (status)
- return status;
- READ_BUF(4);
- lock->lk_new_lock_seqid = be32_to_cpup(p++);
- status = nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
- &lock->lk_new_owner);
- if (status)
- return status;
- } else {
- status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
- if (status)
- return status;
- READ_BUF(4);
- lock->lk_old_lock_seqid = be32_to_cpup(p++);
- }
+ status = nfsd4_decode_locker4(argp, lock);
DECODE_TAIL;
}
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 22b00104bc1a..abd45f03634f 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -555,6 +555,27 @@ static inline bool xdr_item_is_present(const __be32 *p)
return *p != xdr_zero;
}
+/**
+ * xdr_stream_decode_bool - Decode a boolean
+ * @xdr: pointer to xdr_stream
+ * @ptr: pointer to a u32 in which to store the result
+ *
+ * Return values:
+ * %0 on success
+ * %-EBADMSG on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_decode_bool(struct xdr_stream *xdr, __u32 *ptr)
+{
+ const size_t count = sizeof(*ptr);
+ __be32 *p = xdr_inline_decode(xdr, count);
+
+ if (unlikely(!p))
+ return -EBADMSG;
+ *ptr = (*p != xdr_zero);
+ return 0;
+}
+
/**
* xdr_stream_decode_u32 - Decode a 32-bit integer
* @xdr: pointer to xdr_stream
