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NFSv3: Improve NFSv3 performance when server returns no post-op attributes

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When the server fails to return post-op attributes, the client's
attempt to place read data directly in the page cache fails, and
so we have to do an extra copy in order to realign the data with
page borders.
This patch attempts to detect servers that don't return post-op
attributes on read (e.g. for pNFS) and adjusts the placement
calculation accordingly.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2018-03-05 12:03:00 -05:00 committed by Trond Myklebust
parent 80f4236886
commit 8d8928d879
4 changed files with 15 additions and 2 deletions
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5
fs/nfs/nfs3proc.c
View File

@ -786,6 +786,7 @@ nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
{
struct inode *inode = hdr->inode;
struct nfs_server *server = NFS_SERVER(inode);
if (hdr->pgio_done_cb != NULL)
return hdr->pgio_done_cb(task, hdr);
@ -793,6 +794,9 @@ static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
if (nfs3_async_handle_jukebox(task, inode))
return -EAGAIN;
if (task->tk_status >= 0 && !server->read_hdrsize)
cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
nfs_invalidate_atime(inode);
nfs_refresh_inode(inode, &hdr->fattr);
return 0;
@ -802,6 +806,7 @@ static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
struct rpc_message *msg)
{
msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
}
static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,

6
fs/nfs/nfs3xdr.c
View File

@ -983,10 +983,11 @@ static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
const void *data)
{
const struct nfs_pgio_args *args = data;
unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
encode_read3args(xdr, args);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->count, NFS3_readres_sz);
args->count, replen);
req->rq_rcv_buf.flags |= XDRBUF_READ;
}
@ -1675,9 +1676,11 @@ static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
void *data)
{
struct nfs_pgio_res *result = data;
unsigned int pos;
enum nfs_stat status;
int error;
pos = xdr_stream_pos(xdr);
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
@ -1687,6 +1690,7 @@ static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
result->op_status = status;
if (status != NFS3_OK)
goto out_status;
result->replen = 3 + ((xdr_stream_pos(xdr) - pos) >> 2);
error = decode_read3resok(xdr, result);
out:
return error;

3
include/linux/nfs_fs_sb.h
View File

@ -228,6 +228,9 @@ struct nfs_server {
unsigned short mountd_port;
unsigned short mountd_protocol;
struct rpc_wait_queue uoc_rpcwaitq;
/* XDR related information */
unsigned int read_hdrsize;
};
/* Server capabilities */

3
include/linux/nfs_xdr.h
View File

@ -608,6 +608,7 @@ struct nfs_pgio_args {
__u32 count;
unsigned int pgbase;
struct page ** pages;
unsigned int replen; /* used by read */
const u32 * bitmask; /* used by write */
enum nfs3_stable_how stable; /* used by write */
};
@ -618,9 +619,9 @@ struct nfs_pgio_res {
__u32 count;
__u32 op_status;
int eof; /* used by read */
unsigned int replen; /* used by read */
struct nfs_writeverf * verf; /* used by write */
const struct nfs_server *server; /* used by write */
};
/*