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| author | Olga Kornievskaia <kolga@netapp.com> | 2019-07-03 10:38:02 -0400 |
|---|---|---|
| committer | Olga Kornievskaia <olga.kornievskaia@gmail.com> | 2019-10-09 12:06:22 -0400 |
| commit | 1275101026b48f43e194de074b11ab04fee8b89b (patch) | |
| tree | 4c692b9dc858d8b3d6fb325423b1c185bfc7bacc /fs/nfs/nfs4file.c | |
| parent | 0e65a32c8a569db363048e17a708b1a0913adbef (diff) | |
| download | lwn-1275101026b48f43e194de074b11ab04fee8b89b.tar.gz lwn-1275101026b48f43e194de074b11ab04fee8b89b.zip | |
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.c | 16 |
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) |