diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index 2d4cb54739ca..583ab4c4d773 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -3747,7 +3747,8 @@ static int smb3_simple_fallocate_write_range(unsigned int xid,
 static int smb3_simple_fallocate_range(unsigned int xid,
 				       struct cifs_tcon *tcon,
 				       struct cifsFileInfo *cfile,
-				       loff_t off, loff_t len)
+				       loff_t off, loff_t len,
+				       loff_t old_eof)
 {
 	struct file_allocated_range_buffer in_data, *out_data = NULL, *tmp_data;
 	struct inode *inode = d_inode(cfile->dentry);
@@ -3763,7 +3764,7 @@ static int smb3_simple_fallocate_range(unsigned int xid,
 		goto out;
 	}
 
-	if (off >= i_size_read(inode)) {
+	if (off >= old_eof) {
 		rc = smb3_simple_fallocate_write_range(xid, tcon, cfile,
 						       off, len, buf);
 		goto out;
@@ -3874,7 +3875,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 	struct cifsFileInfo *cfile = file->private_data;
 	long rc = -EOPNOTSUPP;
 	unsigned int xid;
-	loff_t old_eof, new_eof;
+	loff_t old_eof, new_eof, local_eof;
 	struct smb2_file_all_info file_inf;
 	u64 asize;
 	int qrc;
@@ -3883,18 +3884,37 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 
 	inode = d_inode(cfile->dentry);
 	cifsi = CIFS_I(inode);
-	old_eof = i_size_read(inode);
+	old_eof = local_eof = i_size_read(inode);
 
 	trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
 				tcon->ses->Suid, off, len);
-	/* if file not oplocked can't be sure whether asking to extend size */
-	if (!CIFS_CACHE_READ(cifsi))
-		if (!keep_size) {
+
+	if (!keep_size && !CIFS_CACHE_READ(cifsi)) {
+		unsigned long long server_eof;
+
+		rc = filemap_write_and_wait(inode->i_mapping);
+		if (rc) {
 			trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
 				tcon->tid, tcon->ses->Suid, off, len, rc);
 			free_xid(xid);
 			return rc;
 		}
+		netfs_wait_for_outstanding_io(inode);
+
+		rc = query_server_eof(xid, tcon, cfile, &server_eof);
+		if (rc) {
+			trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
+				tcon->tid, tcon->ses->Suid, off, len, rc);
+			free_xid(xid);
+			return rc;
+		}
+		/*
+		 * Only use the larger EOF to decide whether we're extending.
+		 * The pagecache zeroing below must still key off the local
+		 * i_size, so keep local_eof for that.
+		 */
+		old_eof = max_t(loff_t, old_eof, server_eof);
+	}
 
 	/*
 	 * Extending the file
@@ -3918,7 +3938,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 			}
 
 			rc = smb3_simple_fallocate_range(xid, tcon, cfile,
-							 off, len);
+							 off, len, old_eof);
 			if (rc) {
 				spin_lock(&inode->i_lock);
 				cifsi->time = 0;
@@ -3927,7 +3947,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 			}
 
 			new_eof = off + len;
-			cifs_resize_file_locked(inode, old_eof, new_eof);
+			cifs_resize_file_locked(inode, local_eof, new_eof);
 
 			qrc = SMB2_query_info(xid, tcon,
 					      cfile->fid.persistent_fid,
@@ -3975,7 +3995,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 		if (rc)
 			goto out;
 
-		cifs_resize_file_locked(inode, old_eof, new_eof);
+		cifs_resize_file_locked(inode, local_eof, new_eof);
 
 		qrc = SMB2_query_info(xid, tcon,
 				      cfile->fid.persistent_fid,
@@ -4020,7 +4040,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 		}
 	}
 
-	if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
+	if (keep_size || old_eof >= off + len) {
 		/*
 		 * At this point, we are trying to fallocate an internal
 		 * regions of a sparse file. Since smb2 does not have a
@@ -4037,7 +4057,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 		 */
 		if (len <= 1024 * 1024) {
 			rc = smb3_simple_fallocate_range(xid, tcon, cfile,
-							 off, len);
+							 off, len, old_eof);
 			goto out;
 		}
 
@@ -4049,7 +4069,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 		 * ie potentially making a few extra pages at the beginning
 		 * or end of the file non-sparse via set_sparse is harmless.
 		 */
-		if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
+		if (off > 8192 || off + len + 8192 < old_eof) {
 			rc = -EOPNOTSUPP;
 			goto out;
 		}