cifs: Fix FALLOC_FL_INSERT_RANGE by setting i_size after EOF moved

Fix the cifs filesystem implementations of FALLOC_FL_INSERT_RANGE, in
smb3_insert_range(), to set i_size after extending the file on the server
and before we do the copy to open the gap (as we don't clean up the EOF
marker if the copy fails).

Fixes: 7fe6fe9 ("cifs: add FALLOC_FL_INSERT_RANGE support")
Cc: [email protected]
Signed-off-by: David Howells <[email protected]>
Acked-by: Paulo Alcantara <[email protected]>
cc: Shyam Prasad N <[email protected]>
cc: Rohith Surabattula <[email protected]>
cc: Jeff Layton <[email protected]>
cc: [email protected]
cc: [email protected]
Signed-off-by: Steve French <[email protected]>

Author: dhowells

fs/smb/client/smb2ops.c

@@ -3745,6 +3745,9 @@ static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon,
 	if (rc < 0)
 		goto out_2;
 
+	truncate_setsize(inode, old_eof + len);
+	fscache_resize_cookie(cifs_inode_cookie(inode), i_size_read(inode));
+
 	rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len);
 	if (rc < 0)
 		goto out_2;