From 75069f2b5bfb5164beafaf3da597279c25b5535a Mon Sep 17 00:00:00 2001 From: David Drysdale Date: Thu, 8 Jan 2015 14:32:29 -0800 Subject: [PATCH] vfs: renumber FMODE_NONOTIFY and add to uniqueness check Fix clashing values for O_PATH and FMODE_NONOTIFY on sparc. The clashing O_PATH value was added in commit 5229645bdc35 ("vfs: add nonconflicting values for O_PATH") but this can't be changed as it is user-visible. FMODE_NONOTIFY is only used internally in the kernel, but it is in the same numbering space as the other O_* flags, as indicated by the comment at the top of include/uapi/asm-generic/fcntl.h (and its use in fs/notify/fanotify/fanotify_user.c). So renumber it to avoid the clash. All of this has happened before (commit 12ed2e36c98a: "fanotify: FMODE_NONOTIFY and __O_SYNC in sparc conflict"), and all of this will happen again -- so update the uniqueness check in fcntl_init() to include __FMODE_NONOTIFY. Signed-off-by: David Drysdale Acked-by: David S. Miller Acked-by: Jan Kara Cc: Heinrich Schuchardt Cc: Alexander Viro Cc: Arnd Bergmann Cc: Stephen Rothwell Cc: Eric Paris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/fcntl.c | 5 +++-- include/linux/fs.h | 2 +- include/uapi/asm-generic/fcntl.h | 2 +- 3 files changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/fcntl.c b/fs/fcntl.c index 99d440a4a6ba..ee85cd4e136a 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -740,14 +740,15 @@ static int __init fcntl_init(void) * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY * is defined as O_NONBLOCK on some platforms and not on others. */ - BUILD_BUG_ON(20 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32( + BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32( O_RDONLY | O_WRONLY | O_RDWR | O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC | O_APPEND | /* O_NONBLOCK | */ __O_SYNC | O_DSYNC | FASYNC | O_DIRECT | O_LARGEFILE | O_DIRECTORY | O_NOFOLLOW | O_NOATIME | O_CLOEXEC | - __FMODE_EXEC | O_PATH | __O_TMPFILE + __FMODE_EXEC | O_PATH | __O_TMPFILE | + __FMODE_NONOTIFY )); fasync_cache = kmem_cache_create("fasync_cache", diff --git a/include/linux/fs.h b/include/linux/fs.h index f90c0282c114..42efe13077b6 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -135,7 +135,7 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, #define FMODE_CAN_WRITE ((__force fmode_t)0x40000) /* File was opened by fanotify and shouldn't generate fanotify events */ -#define FMODE_NONOTIFY ((__force fmode_t)0x1000000) +#define FMODE_NONOTIFY ((__force fmode_t)0x4000000) /* * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h index 7543b3e51331..e063effe0cc1 100644 --- a/include/uapi/asm-generic/fcntl.h +++ b/include/uapi/asm-generic/fcntl.h @@ -5,7 +5,7 @@ /* * FMODE_EXEC is 0x20 - * FMODE_NONOTIFY is 0x1000000 + * FMODE_NONOTIFY is 0x4000000 * These cannot be used by userspace O_* until internal and external open * flags are split. * -Eric Paris