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authorOlga Kornievskaia <kolga@netapp.com>2019-07-03 10:38:02 -0400
committerOlga Kornievskaia <olga.kornievskaia@gmail.com>2019-10-09 12:06:22 -0400
commit1275101026b48f43e194de074b11ab04fee8b89b (patch)
tree4c692b9dc858d8b3d6fb325423b1c185bfc7bacc /fs/nfs/nfs4file.c
parent0e65a32c8a569db363048e17a708b1a0913adbef (diff)
NFS based on file size issue sync copy or fallback to generic copy offload
For small file sizes, it make sense to issue a synchronous copy (and save an RPC callback operation). Also, for the inter copy offload, copy len must be larger than the cost of doing a mount between the destination and source server (14RPCs are sent during 4.x mount). Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Diffstat (limited to 'fs/nfs/nfs4file.c')
-rw-r--r--fs/nfs/nfs4file.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 2af30b7f5bfd..897832564923 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -138,6 +138,7 @@ static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
struct nl4_server *nss = NULL;
nfs4_stateid *cnrs = NULL;
ssize_t ret;
+ bool sync = false;
/* Only offload copy if superblock is the same */
if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
@@ -146,8 +147,21 @@ static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
return -EOPNOTSUPP;
if (file_inode(file_in) == file_inode(file_out))
return -EOPNOTSUPP;
+ /* if the copy size if smaller than 2 RPC payloads, make it
+ * synchronous
+ */
+ if (count <= 2 * NFS_SERVER(file_inode(file_in))->rsize)
+ sync = true;
retry:
if (!nfs42_files_from_same_server(file_in, file_out)) {
+ /* for inter copy, if copy size if smaller than 12 RPC
+ * payloads, fallback to traditional copy. There are
+ * 14 RPCs during an NFSv4.x mount between source/dest
+ * servers.
+ */
+ if (sync ||
+ count <= 14 * NFS_SERVER(file_inode(file_in))->rsize)
+ return -EOPNOTSUPP;
cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
GFP_NOFS);
if (unlikely(cn_resp == NULL))
@@ -162,7 +176,7 @@ retry:
cnrs = &cn_resp->cnr_stateid;
}
ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
- nss, cnrs);
+ nss, cnrs, sync);
out:
kfree(cn_resp);
if (ret == -EAGAIN)