These patches are in order to add an identifier other than fd which can be used to respond to fanotify permission events. This is useful for HSM use cases which are backed by a daemon to respond reliably [1] and also for reporting pre-dir-content events without an event->fd [2] The first few patches in the series are pulled in from Amir's work to add support for pre-dir-content events. In terms of testing, there are some additional LTP test cases to go with these patches which exercise responding to events via response identifier [3] v3: https://lore.kernel.org/linux-fsdevel/20250711023604.593885-1-ibrahimjirdeh@xxxxxxxx/ v2: https://lore.kernel.org/linux-fsdevel/20250710042049.3705747-1-ibrahimjirdeh@xxxxxxxx/ v1: https://lore.kernel.org/linux-fsdevel/20250623193631.2780278-1-ibrahimjirdeh@xxxxxxxx/ Changes v3 => v4: - Use ida instead of idr for response id allocation Changes v2 => v3: - Add build assertions on new id fields and use union fields interchangeably Changes v1 => v2: - Moved away from adding a unique event identifier, and instead overload event->fd to support a response identifier for now for FAN_REPORT_FID setting. [1] https://lore.kernel.org/all/CAMp4zn8aXNPzq1i8KYmbRfwDBvO5Qefa4isSyS1bwYuvkuBsHg@xxxxxxxxxxxxxx/ [2] https://lore.kernel.org/linux-fsdevel/2dx3pbcnv5w75fxb2ghqtsk6gzl6cuxmd2rinzwbq7xxfjf5z7@3nqidi3mno46/ [3] https://github.com/ibrahim-jirdeh/ltp/commit/91c963eb6758b12ce70b87ec060308017bf08ccb Amir Goldstein (2): fanotify: add support for a variable length permission event fanotify: allow pre-content events with fid info Ibrahim Jirdeh (1): fanotify: introduce event response identifier fs/notify/fanotify/fanotify.c | 72 +++++++++++---- fs/notify/fanotify/fanotify.h | 30 +++++-- fs/notify/fanotify/fanotify_user.c | 133 +++++++++++++++++++++------- include/linux/fanotify.h | 1 + include/linux/fsnotify_backend.h | 2 + include/uapi/linux/fanotify.h | 14 ++- tools/include/uapi/linux/fanotify.h | 11 ++- 7 files changed, 204 insertions(+), 59 deletions(-) -- 2.47.1
