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| author | Zdenek Kabelac <zkabelac@redhat.com> | 2011-08-11 17:55:29 +0000 |
|---|---|---|
| committer | Zdenek Kabelac <zkabelac@redhat.com> | 2011-08-11 17:55:29 +0000 |
| commit | 85ee8e10db8229be1c70b5a776f977f3dbd80756 (patch) | |
| tree | 9e0890581d0718bcf70f3a6916e4a2775cabee0f /udev | |
| parent | cf98c05082c71aa134b697894f0a92aa10d7be24 (diff) | |
| download | lvm2-85ee8e10db8229be1c70b5a776f977f3dbd80756.tar.gz lvm2-85ee8e10db8229be1c70b5a776f977f3dbd80756.tar.xz lvm2-85ee8e10db8229be1c70b5a776f977f3dbd80756.zip | |
Update udev rules to skip DM flags decoding for removed devices
Skip decoding of DM flags when device is removed.
We currently need DM flags only for add|change events. So forking
dmsetup process for removed devices is a waste of CPU time.
Udev is already quite slow, so make it just a tiny bit faster.
Diffstat (limited to 'udev')
| -rw-r--r-- | udev/10-dm.rules.in | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/udev/10-dm.rules.in b/udev/10-dm.rules.in index 606a13db..605e0887 100644 --- a/udev/10-dm.rules.in +++ b/udev/10-dm.rules.in @@ -24,12 +24,6 @@ ENV{DM_SBIN_PATH}="/sbin" TEST!="$env{DM_SBIN_PATH}/dmsetup", ENV{DM_SBIN_PATH}="/usr/sbin" TEST!="$env{DM_SBIN_PATH}/dmsetup", GOTO="dm_end" -# Decode udev control flags and set environment variables appropriately. -# These flags are encoded in DM_COOKIE variable that was introduced in -# kernel version 2.6.31. Therefore, we can use this feature with -# kernels >= 2.6.31 only. -ENV{DM_COOKIE}=="?*", IMPORT{program}="$env{DM_SBIN_PATH}/dmsetup udevflags $env{DM_COOKIE}" - # Device created, major and minor number assigned - "add" event generated. # Table loaded - no event generated. # Device resumed (or renamed) - "change" event generated. @@ -42,6 +36,12 @@ ENV{DM_COOKIE}=="?*", IMPORT{program}="$env{DM_SBIN_PATH}/dmsetup udevflags $env # is not recommended. ACTION!="add|change", GOTO="dm_end" +# Decode udev control flags and set environment variables appropriately. +# These flags are encoded in DM_COOKIE variable that was introduced in +# kernel version 2.6.31. Therefore, we can use this feature with +# kernels >= 2.6.31 only. Cookie is not decoded for remove event. +ENV{DM_COOKIE}=="?*", IMPORT{program}="$env{DM_SBIN_PATH}/dmsetup udevflags $env{DM_COOKIE}" + # Rule out easy-to-detect inappropriate events first. ENV{DISK_RO}=="1", GOTO="dm_disable" |