From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 18 Apr 2011 16:27:35 +0000 (-0400)
Subject: Set FMODE_PREAD for stream_file
X-Git-Tag: v2.0-pre1~175
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=409453cb173082c2dad4d46d7046e6bc1d627fa4;p=lttng-modules.git

Set FMODE_PREAD for stream_file

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/ltt-debugfs-abi.c b/ltt-debugfs-abi.c
index 0ac88611..f5ead59e 100644
--- a/ltt-debugfs-abi.c
+++ b/ltt-debugfs-abi.c
@@ -240,6 +240,12 @@ int lttng_abi_open_stream(struct file *channel_file)
 		ret = PTR_ERR(stream_file);
 		goto file_error;
 	}
+	/*
+	 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
+	 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
+	 * file descriptor, so we set FMODE_PREAD here.
+	 */
+	stream_file->f_mode = FMODE_PREAD;
 	fd_install(stream_fd, stream_file);
 	/*
 	 * The stream holds a reference to the channel within the generic ring