On Wed, Nov 01, 2023 at 07:52:45PM +0800, Ian Kent wrote:
On 25/10/23 22:01, Miklos Szeredi wrote:Our work on systemd was about two areas: get mount info (stat/listmount()
Looks ok to me,covers the primary cases I needed when I worked
on using fsinfo() in systemd.
now) from the kernel, and get the mount ID from notification.
There was watch_queue.h with WATCH_TYPE_MOUNT_NOTIFY and struct
mount_notification->auxiliary_mount (aka mount ID) and event subtype
to get the change status (new mount, umount, etc.)
For example David's:
https://patchwork.kernel.org/project/linux-security-module/patch/155991711016.15579.4449417925184028666.stgit@xxxxxxxxxxxxxxxxxxxxxx/
Do we have any replacement for this?
Karel, is there anything missing you would need for addingMiklos's statmount() and listmount() API is excellent from my point of
libmount support?
view. It looks pretty straightforward to use, and with the unique
mount ID, it's safe too. It will be ideal for things like umount(8)
(and recursive umount, etc.).
For complex scenarios (systemd), we need to get from the kernel the
unique ID's after any change in the mount table to save resources and
call statmount() only for the affected mount node. Parse mountinfo
sucks, call for(listmount(-1)) { statmount() } sucks too :-)