cifs: fix dentry lookups in directory handle cache

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commit be4fde7981 upstream.

Get rid of any prefix paths in @path before lookup_positive_unlocked()
as it will call ->lookup() which already adds those prefix paths
through build_path_from_dentry().

This has caused a performance regression when mounting shares with a
prefix path where readdir(2) would end up retrying several times to
open bad directory names that contained duplicate prefix paths.

Fix this by skipping any prefix paths in @path before calling
lookup_positive_unlocked().

Fixes: e4029e0726 ("cifs: find and use the dentry for cached non-root directories also")
Cc: stable@vger.kernel.org # 6.1+
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Paulo Alcantara 2023-03-24 13:56:33 -03:00 • committed by Greg Kroah-Hartman

parent ce5febd032

commit 11222d9f5a

1 changed files with 34 additions and 2 deletions

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fs/cifs/cached_dir.c

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