On Thu, Dec 01, 2022 at 11:18:33AM -0800, Eric Biggers wrote: > On Thu, Dec 01, 2022 at 02:58:00PM +0800, xiubli@xxxxxxxxxx wrote: > > From: Xiubo Li <xiubli@xxxxxxxxxx> > > > > When close a file it will be deferred to call the fput(), which > > will hold the inode's i_count. And when unmounting the mountpoint > > the evict_inodes() may skip evicting some inodes. > > > > If encrypt is enabled the kernel generate a warning when removing > > the encrypt keys when the skipped inodes still hold the keyring: > > This does not make sense. Unmounting is only possible once all the files on the > filesystem have been closed. > Specifically, __fput() puts the reference to the dentry (and thus the inode) *before* it puts the reference to the mount. And an unmount cannot be done while the mount still has references. So there should not be any issue here. - Eric
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