From 0a8dd2db579f7a0ac7033d6b857c3d5dbaa77563 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Wed, 4 Jun 2014 16:05:40 -0700 Subject: [PATCH] fanotify: FAN_MARK_FLUSH: avoid having to provide a fake/invalid fd and path Originally from Tvrtko Ursulin (https://lkml.org/lkml/2011/1/12/112) Avoid having to provide a fake/invalid fd and path when flushing marks Currently for a group to flush marks it has set it needs to provide a fake or invalid (but resolvable) file descriptor and path when calling fanotify_mark. This patch pulls the flush handling a bit up so file descriptor and path are completely ignored when flushing. I reworked the patch to be applicable again (the signature of fanotify_mark has changed since Tvrtko's work). Signed-off-by: Heinrich Schuchardt Cc: Tvrtko Ursulin Reviewed-by: Jan Kara Acked-by: Eric Paris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/notify/fanotify/fanotify_user.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index 732648b270dc..f6ac6a2fa91e 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -813,6 +813,15 @@ SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags, group->priority == FS_PRIO_0) goto fput_and_out; + if (flags & FAN_MARK_FLUSH) { + ret = 0; + if (flags & FAN_MARK_MOUNT) + fsnotify_clear_vfsmount_marks_by_group(group); + else + fsnotify_clear_inode_marks_by_group(group); + goto fput_and_out; + } + ret = fanotify_find_path(dfd, pathname, &path, flags); if (ret) goto fput_and_out; @@ -824,7 +833,7 @@ SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags, mnt = path.mnt; /* create/update an inode mark */ - switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) { + switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE)) { case FAN_MARK_ADD: if (flags & FAN_MARK_MOUNT) ret = fanotify_add_vfsmount_mark(group, mnt, mask, flags); @@ -837,12 +846,6 @@ SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags, else ret = fanotify_remove_inode_mark(group, inode, mask, flags); break; - case FAN_MARK_FLUSH: - if (flags & FAN_MARK_MOUNT) - fsnotify_clear_vfsmount_marks_by_group(group); - else - fsnotify_clear_inode_marks_by_group(group); - break; default: ret = -EINVAL; } -- 2.30.2