Re: [PATCH] Busy inodes after unmount, be more verbose in generic_shutdown_super

On Mon, Jan 30, Kirill Korotaev wrote:

> >
> > mntput(path->mnt);   // too early mntput()
> > dput(path->dentry);
> >
> >Assuming that in-between this sequence someone unmounts the file system, 
> >your
> >patch will wait for this dput() to finish before it proceeds with 
> >unmounting
> >the file system. I think this isn't what we want.
> No, it won't wait for anything, because if umount happened between 
> mntput/dput, dentry is not in s_dshrinkers list.
> if umount happens in parallell with dput() (where shrinker operations 
> are), then it will behave ok - will wait for dput() and then umount. It 
> was intended behaviour!

It should not wait.

> 
> Also, please, note that such early mntput()'s are bugs!!! because such 
> dentries can reference freed memory after last mntput(). And I remember 
> some patches in 2.4.x/2.6.x which fixed this sequence everywhere.

Thats why I'm complaining ...

Regards,
	Jan

-- 
Jan Blunck                                               [email protected]
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---

• Follow-Ups:
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• References:
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    • From: Olaf Hering <[email protected]>
  • Re: [PATCH] Busy inodes after unmount, be more verbose in generic_shutdown_super
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  • Re: [PATCH] Busy inodes after unmount, be more verbose in generic_shutdown_super
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  • Re: [PATCH] Busy inodes after unmount, be more verbose in generic_shutdown_super
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  • Re: [PATCH] Busy inodes after unmount, be more verbose in generic_shutdown_super
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  • Re: [PATCH] Busy inodes after unmount, be more verbose in generic_shutdown_super
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