On Tue, Mar 30, 2021 at 10:31 AM Christian Brauner <christian.brauner@xxxxxxxxxx> wrote: > > On Sun, Mar 28, 2021 at 06:56:24PM +0300, Amir Goldstein wrote: > > Add a high level hook fsnotify_path_create() which is called from > > syscall context where mount context is available, so that FAN_CREATE > > event can be added to a mount mark mask. > > > > This high level hook is called in addition to fsnotify_create(), > > fsnotify_mkdir() and fsnotify_link() hooks in vfs helpers where the mount > > context is not available. > > > > In the context where fsnotify_path_create() will be called, a dentry flag > > flag is set on the new dentry the suppress the FS_CREATE event in the vfs > > level hooks. > > > > This functionality was requested by Christian Brauner to replace > > recursive inotify watches for detecting when some path was created under > > an idmapped mount without having to monitor FAN_CREATE events in the > > entire filesystem. > > > > In combination with more changes to allow unprivileged fanotify listener > > to watch an idmapped mount, this functionality would be usable also by > > nested container managers. > > > > Link: https://lore.kernel.org/linux-fsdevel/20210318143140.jxycfn3fpqntq34z@wittgenstein/ > > Cc: Christian Brauner <christian.brauner@xxxxxxxxxx> > > Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx> > > --- > > Was about to look at this. Does this require preliminary patches since > it doesn't apply to current master. If so, can you just give me a link > to a branch so I can pull from that? :) > The patch is less useful on its own. Better take the entire work for the demo which includes this patch: [1] https://github.com/amir73il/linux/commits/fanotify_userns [2] https://github.com/amir73il/inotify-tools/commits/fanotify_userns Thanks, Amir.
