NFS: Simplify ->decode_dirent() calling sequence
Clean up.
The pointer returned by ->decode_dirent() is no longer used as a
pointer. The only call site (xdr_decode() in fs/nfs/dir.c) simply
extracts the errno value encoded in the pointer. Replace the
returned pointer with a standard integer errno return value.
Also, pass the "server" argument as part of the nfs_entry instead of
as a separate parameter. It's faster to derive "server" in
nfs_readdir_xdr_to_array() since we already have the directory's inode
handy. "server" ought to be invariant for a set of entries in the
same directory, right?
The legacy versions of decode_dirent() don't use "server" anyway, so
it's wasted work for them to derive and pass "server" for each entry.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 868815c..be9f00a 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -6159,8 +6159,22 @@
}
#endif /* CONFIG_NFS_V4_1 */
-__be32 *nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
- struct nfs_server *server, int plus)
+/**
+ * nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
+ * the local page cache.
+ * @xdr: XDR stream where entry resides
+ * @entry: buffer to fill in with entry data
+ * @plus: boolean indicating whether this should be a readdirplus entry
+ *
+ * Returns zero if successful, otherwise a negative errno value is
+ * returned.
+ *
+ * This function is not invoked during READDIR reply decoding, but
+ * rather whenever an application invokes the getdents(2) system call
+ * on a directory already in our cache.
+ */
+int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
+ int plus)
{
uint32_t bitmap[2] = {0};
uint32_t len;
@@ -6172,9 +6186,9 @@
if (unlikely(!p))
goto out_overflow;
if (!ntohl(*p++))
- return ERR_PTR(-EAGAIN);
+ return -EAGAIN;
entry->eof = 1;
- return ERR_PTR(-EBADCOOKIE);
+ return -EBADCOOKIE;
}
p = xdr_inline_decode(xdr, 12);
@@ -6203,7 +6217,8 @@
if (decode_attr_length(xdr, &len, &p) < 0)
goto out_overflow;
- if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh, server, 1) < 0)
+ if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
+ entry->server, 1) < 0)
goto out_overflow;
if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
entry->ino = entry->fattr->fileid;
@@ -6221,11 +6236,11 @@
else
entry->eof = 0;
- return p;
+ return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
- return ERR_PTR(-EAGAIN);
+ return -EAGAIN;
}
/*