get rid of trylock loop in locking dentries on shrink list

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In case of trylock failure don't re-add to the list - drop the locks
and carefully get them in the right order.  For shrink_dentry_list(),
somebody having grabbed a reference to dentry means that we can
kick it off-list, so if we find dentry being modified under us we
don't need to play silly buggers with retries anyway - off the list
it is.

The locking logics taken out into a helper of its own; lock_parent()
is no longer used for dentries that can be killed under us.

[fix from Eric Biggers folded]

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

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This commit is contained in:

Al Viro 2018-02-23 21:54:18 -05:00

parent c19457f0ae

commit 3b3f09f48b

1 changed files with 67 additions and 37 deletions

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106

fs/dcache.c

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