kernfs: make ->attr.open RCU protected.

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After removal of kernfs_open_node->refcnt in the previous patch,
kernfs_open_node_lock can be removed as well by making ->attr.open
RCU protected. kernfs_put_open_node can delegate freeing to ->attr.open
to RCU and other readers of ->attr.open can do so under rcu_read_(un)lock.

Suggested by: Al Viro <viro@zeniv.linux.org.uk>

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
Link: https://lore.kernel.org/r/20220615021059.862643-2-imran.f.khan@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Imran Khan 2022-06-15 12:10:56 +10:00 • committed by Greg Kroah-Hartman

parent dcab8da13f

commit 086c00c71f

2 changed files with 102 additions and 47 deletions

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147

fs/kernfs/file.c

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2

include/linux/kernfs.h

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