From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-f67.google.com ([209.85.221.67]:35254 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725747AbeJDEP6 (ORCPT ); Thu, 4 Oct 2018 00:15:58 -0400 Received: by mail-wr1-f67.google.com with SMTP id w5-v6so7694004wrt.2 for ; Wed, 03 Oct 2018 14:25:51 -0700 (PDT) From: Amir Goldstein To: Jan Kara Cc: linux-fsdevel@vger.kernel.org Subject: [PATCH v3 2/8] fsnotify: generalize handling of extra event flags Date: Thu, 4 Oct 2018 00:25:33 +0300 Message-Id: <20181003212539.2384-3-amir73il@gmail.com> In-Reply-To: <20181003212539.2384-1-amir73il@gmail.com> References: <20181003212539.2384-1-amir73il@gmail.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: FS_EVENT_ON_CHILD gets a special treatment in fsnotify() because it is not a flag specifying an event type, but rather an extra flags that may be reported along with another event and control the handling of the event by the backend. FS_ISDIR is also an "extra flag" and not an "event type" and therefore desrves the same treatment. With inotify/dnotify backends it was never possible to set FS_ISDIR in mark masks, so it did not matter. With fanotify backend, mark adding code jumps through hoops to avoid setting the FS_ISDIR in the commulative object mask. Separate the constant ALL_FSNOTIFY_EVENTS to ALL_FSNOTIFY_FLAGS and ALL_FSNOTIFY_EVENTS, so the latter can be used to test for specific event types. Signed-off-by: Amir Goldstein --- fs/notify/fsnotify.c | 7 +++---- include/linux/fsnotify_backend.h | 9 +++++++-- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 422fbc6dffde..7391a02bf723 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -196,7 +196,7 @@ static int send_to_group(struct inode *to_tell, struct fsnotify_iter_info *iter_info) { struct fsnotify_group *group = NULL; - __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD); + __u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS); __u32 marks_mask = 0; __u32 marks_ignored_mask = 0; struct fsnotify_mark *mark; @@ -329,8 +329,7 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is, struct mount *mnt = NULL; __u32 mnt_or_sb_mask = 0; int ret = 0; - /* global tests shouldn't care about events on child only the specific event */ - __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD); + __u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS); if (data_is == FSNOTIFY_EVENT_PATH) { mnt = real_mount(((const struct path *)data)->mnt); @@ -396,7 +395,7 @@ static __init int fsnotify_init(void) { int ret; - BUG_ON(hweight32(ALL_FSNOTIFY_EVENTS) != 23); + BUG_ON(hweight32(ALL_FSNOTIFY_BITS) != 23); ret = init_srcu_struct(&fsnotify_mark_srcu); if (ret) diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index 8e91341cbd8a..135b973e44d1 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -68,15 +68,20 @@ #define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM) +/* Events that can be reported to backends */ #define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \ FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \ FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \ FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \ FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \ - FS_OPEN_PERM | FS_ACCESS_PERM | FS_EXCL_UNLINK | \ - FS_ISDIR | FS_IN_ONESHOT | FS_DN_RENAME | \ + FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME) + +/* Extra flags that may be reported with event or control handling of events */ +#define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \ FS_DN_MULTISHOT | FS_EVENT_ON_CHILD) +#define ALL_FSNOTIFY_BITS (ALL_FSNOTIFY_EVENTS | ALL_FSNOTIFY_FLAGS) + struct fsnotify_group; struct fsnotify_event; struct fsnotify_mark; -- 2.17.1