[PATCH] Introduce FMODE_EXEC file flag
Introduce FMODE_EXEC file flag, to indicate that file is being opened for
execution. This is useful for distributed filesystems to maintain
consistent behavior for returning ETXTBUSY when opening for write and
execution happens on different nodes.
akpm:
Needed by Lustre at present. I assume their objective to to work towards
being able to install Lustre on an unmodified distro kernel, which seems
sane. It should have zero runtime cost.
Trond and Chuck indicate that NFS4 can probably use this too, for the same
thing.
Steven says it's also on the GFS todo list.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Chuck Lever <cel@citi.umich.edu>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/exec.c b/fs/exec.c
index 0b515ac..d8c477a 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -127,7 +127,7 @@
struct nameidata nd;
int error;
- error = __user_path_lookup_open(library, LOOKUP_FOLLOW, &nd, FMODE_READ);
+ error = __user_path_lookup_open(library, LOOKUP_FOLLOW, &nd, FMODE_READ|FMODE_EXEC);
if (error)
goto out;
@@ -477,7 +477,7 @@
int err;
struct file *file;
- err = path_lookup_open(AT_FDCWD, name, LOOKUP_FOLLOW, &nd, FMODE_READ);
+ err = path_lookup_open(AT_FDCWD, name, LOOKUP_FOLLOW, &nd, FMODE_READ|FMODE_EXEC);
file = ERR_PTR(err);
if (!err) {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7c75031..21e8cf7 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -65,6 +65,11 @@
#define FMODE_PREAD 8
#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
+/* File is being opened for execution. Primary users of this flag are
+ distributed filesystems that can use it to achieve correct ETXTBUSY
+ behavior for cross-node execution/opening_for_writing of files */
+#define FMODE_EXEC 16
+
#define RW_MASK 1
#define RWA_MASK 2
#define READ 0