[PATCH 1/1] NFS append COMMIT after synchronous COPY

[Olga Kornievskaia <kolga@netapp.com>]

Instead of messing with the commit path which has been causing issues,
add a COMMIT op after the COPY and ask for stable copies in the first
space.

It saves a round trip, since after the COPY, the client sends a COMMIT
anyway.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/nfs/internal.h  |  1 -
 fs/nfs/nfs42proc.c |  6 ------
 fs/nfs/nfs42xdr.c  | 19 +++++++++++++++++--
 fs/nfs/write.c     | 30 ------------------------------
 4 files changed, 17 insertions(+), 39 deletions(-)

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 7b38fed..2989418 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -495,7 +495,6 @@ void nfs_mark_request_commit(struct nfs_page *req,
 			     u32 ds_commit_idx);
 int nfs_write_need_commit(struct nfs_pgio_header *);
 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
-int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf);
 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 			    int how, struct nfs_commit_info *cinfo);
 void nfs_retry_commit(struct list_head *page_list,
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 1e486c7..9fee48d 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -174,12 +174,6 @@ static ssize_t _nfs42_proc_copy(struct file *src,
 	if (status)
 		return status;
 
-	if (res->write_res.verifier.committed != NFS_FILE_SYNC) {
-		status = nfs_commit_file(dst, &res->write_res.verifier.verifier);
-		if (status)
-			return status;
-	}
-
 	truncate_pagecache_range(dst_inode, pos_dst,
 				 pos_dst + res->write_res.count);
 
diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index 6c72964..8bdf1d5 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -66,12 +66,14 @@
 					 encode_putfh_maxsz + \
 					 encode_savefh_maxsz + \
 					 encode_putfh_maxsz + \
-					 encode_copy_maxsz)
+					 encode_copy_maxsz + \
+					 encode_commit_maxsz)
 #define NFS4_dec_copy_sz		(compound_decode_hdr_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_savefh_maxsz + \
 					 decode_putfh_maxsz + \
-					 decode_copy_maxsz)
+					 decode_copy_maxsz + \
+					 decode_commit_maxsz)
 #define NFS4_enc_deallocate_sz		(compound_encode_hdr_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_deallocate_maxsz + \
@@ -222,6 +224,18 @@ static void nfs4_xdr_enc_allocate(struct rpc_rqst *req,
 	encode_nops(&hdr);
 }
 
+static void encode_copy_commit(struct xdr_stream *xdr,
+			  struct nfs42_copy_args *args,
+			  struct compound_hdr *hdr)
+{
+	__be32 *p;
+
+	encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
+	p = reserve_space(xdr, 12);
+	p = xdr_encode_hyper(p, args->dst_pos);
+	*p = cpu_to_be32(args->count);
+}
+
 /*
  * Encode COPY request
  */
@@ -239,6 +253,7 @@ static void nfs4_xdr_enc_copy(struct rpc_rqst *req,
 	encode_savefh(xdr, &hdr);
 	encode_putfh(xdr, args->dst_fh, &hdr);
 	encode_copy(xdr, args, &hdr);
+	encode_copy_commit(xdr, args, &hdr);
 	encode_nops(&hdr);
 }
 
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index abb2c8a..8d65d88 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1720,36 +1720,6 @@ void nfs_retry_commit(struct list_head *page_list,
 	return -ENOMEM;
 }
 
-int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf)
-{
-	struct inode *inode = file_inode(file);
-	struct nfs_open_context *open;
-	struct nfs_commit_info cinfo;
-	struct nfs_page *req;
-	int ret;
-
-	open = get_nfs_open_context(nfs_file_open_context(file));
-	req  = nfs_create_request(open, NULL, NULL, 0, i_size_read(inode));
-	if (IS_ERR(req)) {
-		ret = PTR_ERR(req);
-		goto out_put;
-	}
-
-	nfs_init_cinfo_from_inode(&cinfo, inode);
-
-	memcpy(&req->wb_verf, verf, sizeof(struct nfs_write_verifier));
-	nfs_request_add_commit_list(req, &cinfo);
-	ret = nfs_commit_inode(inode, FLUSH_SYNC);
-	if (ret > 0)
-		ret = 0;
-
-	nfs_free_request(req);
-out_put:
-	put_nfs_open_context(open);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(nfs_commit_file);
-
 /*
  * COMMIT call returned
  */
-- 
1.8.3.1