From: Oleg Drokin 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 Cc: Trond Myklebust Cc: Chuck Lever Cc: Steven Whitehouse Signed-off-by: Andrew Morton --- fs/exec.c | 4 ++-- include/linux/fs.h | 5 +++++ 2 files changed, 7 insertions(+), 2 deletions(-) diff -puN fs/exec.c~introduce-fmode_exec-file-flag fs/exec.c --- devel/fs/exec.c~introduce-fmode_exec-file-flag 2006-02-23 19:41:25.000000000 -0800 +++ devel-akpm/fs/exec.c 2006-02-23 19:41:25.000000000 -0800 @@ -127,7 +127,7 @@ asmlinkage long sys_uselib(const char __ 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 @@ struct file *open_exec(const char *name) 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 -puN include/linux/fs.h~introduce-fmode_exec-file-flag include/linux/fs.h --- devel/include/linux/fs.h~introduce-fmode_exec-file-flag 2006-02-23 19:41:25.000000000 -0800 +++ devel-akpm/include/linux/fs.h 2006-02-23 19:41:25.000000000 -0800 @@ -65,6 +65,11 @@ extern int dir_notify_enable; #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 _