non-RCU analogue of the previous commit

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new helper: choose_mountpoint().  Wrapper around choose_mountpoint_rcu(),
similar to lookup_mnt() vs. __lookup_mnt().  follow_dotdot() switched to
it.  Now we don't grab mount_lock exclusive anymore; note that the
primitive used non-RCU mount traversals in other direction (lookup_mnt())
doesn't bother with that either - it uses mount_lock seqcount instead.

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

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Al Viro 2020-02-26 19:19:05 -05:00

parent 7ef482fa65

commit 2aa3847085

1 changed files with 39 additions and 17 deletions

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fs/namei.c

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