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kernfs: switch kernfs to use an rwsem

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The kernfs global lock restricts the ability to perform kernfs node
lookup operations in parallel during path walks.

Change the kernfs mutex to an rwsem so that, when opportunity arises,
node searches can be done in parallel with path walk lookups.

Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Link: https://lore.kernel.org/r/162642770946.63632.2218304587223241374.stgit@web.messagingengine.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Kent
2021-07-16 17:28:29 +08:00
committed by Greg Kroah-Hartman
parent c7e7c04274
commit 7ba0273b2f
7 changed files with 72 additions and 71 deletions
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2
include/linux/kernfs.h
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@@ -193,7 +193,7 @@ struct kernfs_root {
u32 id_highbits;
struct kernfs_syscall_ops *syscall_ops;
/* list of kernfs_super_info of this root, protected by kernfs_mutex */
/* list of kernfs_super_info of this root, protected by kernfs_rwsem */
struct list_head supers;
wait_queue_head_t deactivate_waitq;