Add IO_FLAG_EXCLUSIVE flag to io_channel abstraction
Add a new io_channel open flag, IO_FLAG_EXCLUSIVE,which requests that
the device be opened in exclusive (O_EXCL) mode. Add support to the unix_io
implementation for this flag.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/lib/ext2fs/unix_io.c b/lib/ext2fs/unix_io.c
index e1df0d6..0f04cfa 100644
--- a/lib/ext2fs/unix_io.c
+++ b/lib/ext2fs/unix_io.c
@@ -412,6 +412,8 @@
goto cleanup;
open_flags = (flags & IO_FLAG_RW) ? O_RDWR : O_RDONLY;
+ if (flags & IO_FLAG_EXCLUSIVE)
+ open_flags |= O_EXCL;
#ifdef HAVE_OPEN64
data->dev = open64(io->name, open_flags);
#else