make struct mountpoint bear the dentry reference to mountpoint, not struct mount

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Using dput_to_list() to shift the contributing reference from ->mnt_mountpoint
to ->mnt_mp->m_dentry.  Dentries are dropped (with dput_to_list()) as soon
as struct mountpoint is destroyed; in cases where we are under namespace_sem
we use the global list, shrinking it in namespace_unlock().  In case of
detaching stuck MNT_LOCKed children at final mntput_no_expire() we use a local
list and shrink it ourselves.  ->mnt_ex_mountpoint crap is gone.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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This commit is contained in:

Al Viro 2019-06-30 10:39:08 -04:00

parent 9bdebc2bd1

commit 4edbe133f8

2 changed files with 25 additions and 28 deletions

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1

fs/mount.h

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52

fs/namespace.c

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