From 6e4e3c3ab67d4ad050a5e704287ea3577fe45b17 Mon Sep 17 00:00:00 2001 From: Justin Gottula Date: Tue, 6 Jul 2021 13:41:17 -0700 Subject: [PATCH] Udev rules: remove zvol compat symlinks (without the leading zvol/) This is a potentially arguable change, because it removes some compatibility cruft that certain systems or people may have come to rely on (either a very long time ago, or unwisely in recent times). On the other hand, it's been literally over a decade since OpenZFS switched to the strategy of using opaque numbered /dev/zd* device nodes, with the canonical zvol access path being a directory tree of symlinks created by udev rules inside /dev/zvol/*. (See #102.) Even at the time, the /dev/* scheme was labeled as being for "compatibility". This commit removes the second tree of symlinks located directly at /dev/*, under the assumption that anybody with any sense has been using the intended /dev/zvol/* path for a very very long time now. (The more I think about this, the more I anticipate that some large fraction of people will have been blissfully unaware that the intention has been for them to use the /dev/zvol/* tree all along, and they will have come to rely upon the /dev/* tree simply because it's been there this whole time despite being a compat thing.) Reviewed-by: Brian Behlendorf Reviewed-by: Pavel Zakharov Reviewed-by: Neal Gompa Signed-off-by: Justin Gottula Closes #12303 --- udev/rules.d/60-zvol.rules.in | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/udev/rules.d/60-zvol.rules.in b/udev/rules.d/60-zvol.rules.in index a3c7d2acf..9a2a473a8 100644 --- a/udev/rules.d/60-zvol.rules.in +++ b/udev/rules.d/60-zvol.rules.in @@ -1,6 +1,11 @@ # Persistent links for zvol # # persistent disk links: /dev/zvol/dataset_name -# also creates compatibility symlink of /dev/dataset_name +# +# NOTE: We used to also create an additional tree of zvol symlinks located at +# /dev/dataset_name (i.e. without the 'zvol' path component) for +# compatibility reasons. These are no longer created anymore, and should +# not be relied upon. +# -KERNEL=="zd*", SUBSYSTEM=="block", ACTION=="add|change", PROGRAM=="@udevdir@/zvol_id $devnode", SYMLINK+="zvol/%c %c" +KERNEL=="zd*", SUBSYSTEM=="block", ACTION=="add|change", PROGRAM=="@udevdir@/zvol_id $devnode", SYMLINK+="zvol/%c"