1 files changed, 35 insertions, 18 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 9f98458..e560a78 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -313,19 +313,34 @@ static int nfs_writepages_callback(struct page *page, struct writeback_control *
 int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
 {
 	struct inode *inode = mapping->host;
+	unsigned long *bitlock = &NFS_I(inode)->flags;
 	struct nfs_pageio_descriptor pgio;
 	int err;
 
+	/* Stop dirtying of new pages while we sync */
+	err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
+			nfs_wait_bit_killable, TASK_KILLABLE);
+	if (err)
+		goto out_err;
+
 	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
 
 	nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
 	err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
 	nfs_pageio_complete(&pgio);
+
+	clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
+	smp_mb__after_clear_bit();
+	wake_up_bit(bitlock, NFS_INO_FLUSHING);
+
 	if (err < 0)
-		return err;
-	if (pgio.pg_error < 0)
-		return pgio.pg_error;
+		goto out_err;
+	err = pgio.pg_error;
+	if (err < 0)
+		goto out_err;
 	return 0;
+out_err:
+	return err;
 }
 
 /*
@@ -404,7 +419,6 @@ nfs_mark_request_commit(struct nfs_page *req)
 	struct nfs_inode *nfsi = NFS_I(inode);
 
 	spin_lock(&inode->i_lock);
-	nfsi->ncommit++;
 	set_bit(PG_CLEAN, &(req)->wb_flags);
 	radix_tree_tag_set(&nfsi->nfs_page_tree,
 			req->wb_index,
@@ -524,6 +538,12 @@ static void nfs_cancel_commit_list(struct list_head *head)
 }
 
 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
+static int
+nfs_need_commit(struct nfs_inode *nfsi)
+{
+	return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT);
+}
+
 /*
  * nfs_scan_commit - Scan an inode for commit requests
  * @inode: NFS inode to scan
@@ -538,16 +558,18 @@ static int
 nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
-	int res = 0;
 
-	if (nfsi->ncommit != 0) {
-		res = nfs_scan_list(nfsi, dst, idx_start, npages,
-				NFS_PAGE_TAG_COMMIT);
-		nfsi->ncommit -= res;
-	}
-	return res;
+	if (!nfs_need_commit(nfsi))
+		return 0;
+
+	return nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT);
 }
 #else
+static inline int nfs_need_commit(struct nfs_inode *nfsi)
+{
+	return 0;
+}
+
 static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
 {
 	return 0;
@@ -820,7 +842,7 @@ static int nfs_write_rpcsetup(struct nfs_page *req,
 	data->args.stable  = NFS_UNSTABLE;
 	if (how & FLUSH_STABLE) {
 		data->args.stable = NFS_DATA_SYNC;
-		if (!NFS_I(inode)->ncommit)
+		if (!nfs_need_commit(NFS_I(inode)))
 			data->args.stable = NFS_FILE_SYNC;
 	}
 
@@ -1425,18 +1447,13 @@ static int nfs_write_mapping(struct address_space *mapping, int how)
 {
 	struct writeback_control wbc = {
 		.bdi = mapping->backing_dev_info,
-		.sync_mode = WB_SYNC_NONE,
+		.sync_mode = WB_SYNC_ALL,
 		.nr_to_write = LONG_MAX,
 		.range_start = 0,
 		.range_end = LLONG_MAX,
 		.for_writepages = 1,
 	};
-	int ret;
 
-	ret = __nfs_write_mapping(mapping, &wbc, how);
-	if (ret < 0)
-		return ret;
-	wbc.sync_mode = WB_SYNC_ALL;
 	return __nfs_write_mapping(mapping, &wbc, how);
 }