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NFS based on file size issue sync copy or fallback to generic copy offload

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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>
This commit is contained in:
Olga Kornievskaia 2019-07-03 10:38:02 -04:00 committed by Olga Kornievskaia
parent 0e65a32c8a
commit 1275101026
3 changed files with 18 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
fs/nfs/nfs42.h
View file

@ -16,7 +16,7 @@
#ifdef CONFIG_NFS_V4_2
int nfs42_proc_allocate(struct file *, loff_t, loff_t);
ssize_t nfs42_proc_copy(struct file *, loff_t, struct file *, loff_t, size_t,
struct nl4_server *, nfs4_stateid *);
struct nl4_server *, nfs4_stateid *, bool);
int nfs42_proc_deallocate(struct file *, loff_t, loff_t);
loff_t nfs42_proc_llseek(struct file *, loff_t, int);
int nfs42_proc_layoutstats_generic(struct nfs_server *,

4
fs/nfs/nfs42proc.c
View file

@ -357,7 +357,7 @@ static ssize_t _nfs42_proc_copy(struct file *src,
ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
struct file *dst, loff_t pos_dst, size_t count,
struct nl4_server *nss,
nfs4_stateid *cnr_stateid)
nfs4_stateid *cnr_stateid, bool sync)
{
struct nfs_server *server = NFS_SERVER(file_inode(dst));
struct nfs_lock_context *src_lock;
@ -368,7 +368,7 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
.dst_fh = NFS_FH(file_inode(dst)),
.dst_pos = pos_dst,
.count = count,
.sync = false,
.sync = sync,
};
struct nfs42_copy_res res;
struct nfs4_exception src_exception = {

16
fs/nfs/nfs4file.c
View file

@ -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 @@ static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
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)