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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>
This commit is contained in:
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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2
include/linux/kernfs.h
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@ -114,7 +114,7 @@ struct kernfs_elem_symlink {
struct kernfs_elem_attr {
const struct kernfs_ops *ops;
struct kernfs_open_node *open;
struct kernfs_open_node __rcu *open;
loff_t size;
struct kernfs_node *notify_next; /* for kernfs_notify() */
};