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authorPeng Tao <tao.peng@primarydata.com>2015-09-25 21:24:37 +0300
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-10-15 23:08:18 +0300
commit2a92ee92d4545448066fb664674c0ae5a9d5ea99 (patch)
treee24c885891708e270231568400d1edd3041cabc1 /fs/nfs/nfs4xdr.c
parentbea51b30b281039f0f43fb4f42028ddf33fb601f (diff)
downloadlinux-2a92ee92d4545448066fb664674c0ae5a9d5ea99.tar.xz
nfs: get clone_blksize when probing fsinfo
NFSv42 CLONE operation is supposed to respect it. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/nfs4xdr.c')
-rw-r--r--fs/nfs/nfs4xdr.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 868472b6b303..9f656791a338 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4764,6 +4764,28 @@ static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
return 0;
}
+/*
+ * The granularity of a CLONE operation.
+ */
+static int decode_attr_clone_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
+ uint32_t *res)
+{
+ __be32 *p;
+
+ dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
+ *res = 0;
+ if (bitmap[2] & FATTR4_WORD2_CLONE_BLKSIZE) {
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p)) {
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+ }
+ *res = be32_to_cpup(p);
+ bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
+ }
+ return 0;
+}
+
static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
{
unsigned int savep;
@@ -4798,6 +4820,9 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
if (status)
goto xdr_error;
+ status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
+ if (status)
+ goto xdr_error;
status = verify_attr_len(xdr, savep, attrlen);
xdr_error: