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inotify: force inotify and fsnotify use same bits

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inotify uses bits called IN_* and fsnotify uses bits called FS_*.  These
need to line up.  This patch adds build time checks to make sure noone can
change these bits so they are not the same.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2010-07-28 10:18:37 -04:00
parent 8c1934c8d7
commit f874e1ac21
2 changed files with 30 additions and 0 deletions
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21
fs/notify/inotify/inotify_user.c
View file

@ -839,6 +839,27 @@ SYSCALL_DEFINE2(inotify_rm_watch, int, fd, __s32, wd)
*/
static int __init inotify_user_setup(void)
{
BUILD_BUG_ON(IN_ACCESS != FS_ACCESS);
BUILD_BUG_ON(IN_MODIFY != FS_MODIFY);
BUILD_BUG_ON(IN_ATTRIB != FS_ATTRIB);
BUILD_BUG_ON(IN_CLOSE_WRITE != FS_CLOSE_WRITE);
BUILD_BUG_ON(IN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE);
BUILD_BUG_ON(IN_OPEN != FS_OPEN);
BUILD_BUG_ON(IN_MOVED_FROM != FS_MOVED_FROM);
BUILD_BUG_ON(IN_MOVED_TO != FS_MOVED_TO);
BUILD_BUG_ON(IN_CREATE != FS_CREATE);
BUILD_BUG_ON(IN_DELETE != FS_DELETE);
BUILD_BUG_ON(IN_DELETE_SELF != FS_DELETE_SELF);
BUILD_BUG_ON(IN_MOVE_SELF != FS_MOVE_SELF);
BUILD_BUG_ON(IN_UNMOUNT != FS_UNMOUNT);
BUILD_BUG_ON(IN_Q_OVERFLOW != FS_Q_OVERFLOW);
BUILD_BUG_ON(IN_IGNORED != FS_IN_IGNORED);
BUILD_BUG_ON(IN_EXCL_UNLINK != FS_EXCL_UNLINK);
BUILD_BUG_ON(IN_ISDIR != FS_IN_ISDIR);
BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT);
BUG_ON(hweight32(ALL_INOTIFY_BITS) != 21);
inotify_inode_mark_cachep = KMEM_CACHE(inotify_inode_mark, SLAB_PANIC);
event_priv_cachep = KMEM_CACHE(inotify_event_private_data, SLAB_PANIC);

9
include/linux/inotify.h
View file

@ -73,6 +73,15 @@ struct inotify_event {
#ifdef __KERNEL__
#include <linux/sysctl.h>
extern struct ctl_table inotify_table[]; /* for sysctl */
#define ALL_INOTIFY_BITS (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
IN_MOVED_TO | IN_CREATE | IN_DELETE | \
IN_DELETE_SELF | IN_MOVE_SELF | IN_UNMOUNT | \
IN_Q_OVERFLOW | IN_IGNORED | IN_ONLYDIR | \
IN_DONT_FOLLOW | IN_EXCL_UNLINK | IN_MASK_ADD | \
IN_ISDIR | IN_ONESHOT)
#endif
#endif /* _LINUX_INOTIFY_H */