Messages in this thread | | | From | Max Kellermann <> | Date | Mon, 18 Sep 2023 21:45:16 +0200 | Subject | Re: [PATCH 3/4] inotify_user: add system call inotify_add_watch_at() |
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On Mon, Sep 18, 2023 at 2:40 PM Jan Kara <jack@suse.cz> wrote: > Is there any problem with using fanotify for you?
Turns out fanotify is unusable for me, unfortunately. I have been using inotify to get notifications of cgroup events, but the cgroup filesystem appears to be unsupported by fanotify: all attempts to use fanotify_mark() on cgroup event files fail with ENODEV. I think that comes from fanotify_test_fsid(). Filesystems without a fsid work just fine with inotify, but fail with fanotify.
Since fanotify lacks important features, is it really a good idea to feature-freeze inotify?
(By the way, what was not documented is that fanotify_init() can only be used by unprivileged processes if the FAN_REPORT_FID flag was specified. I had to read the kernel sources to figure that out - I have no idea why this limitation exists - the code comment in the kernel source doesn't explain it.)
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