[dm-devel] [PATCH 3/3] udev: add 00-scsi-sg3_config.rules for user configuration

[mwilck@suse.com]

From: Martin Wilck <mwilck@suse.com>

Add a dedicated early rules file to simplify configuring the behavior
of the SCSI udev rules shipped with sg3_utils.

Signed-off-by: Martin Wilck <mwilck@suse.com>
---
 Makefile.am                       |  1 +
 scripts/00-scsi-sg3_config.rules  | 23 +++++++++++++++++++++++
 scripts/55-scsi-sg3_id.rules      |  6 ++----
 scripts/58-scsi-sg3_symlink.rules |  6 +-----
 4 files changed, 27 insertions(+), 9 deletions(-)
 create mode 100644 scripts/00-scsi-sg3_config.rules

diff --git a/Makefile.am b/Makefile.am
index 240acbe..ce7ee71 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -123,6 +123,7 @@ EXTRA_DIST += \
 	inhex/z_act_query.hex
 
 EXTRA_DIST += \
+	scripts/00-scsi-sg3_config.rules \
 	scripts/40-usb-blacklist.rules \
 	scripts/54-before-scsi-sg3_id.rules \
 	scripts/55-scsi-sg3_id.rules \
diff --git a/scripts/00-scsi-sg3_config.rules b/scripts/00-scsi-sg3_config.rules
new file mode 100644
index 0000000..43d6f16
--- /dev/null
+++ b/scripts/00-scsi-sg3_config.rules
@@ -0,0 +1,23 @@
+# Configuration for SCSI device identification
+
+# To apply changes, copy this file to /etc/udev/rules.d and edit to suit your needs.
+# DO NOT EDIT THIS FILE IN PLACE!
+
+ACTION!="add|change", GOTO="scsi_identify_end"
+SUBSYSTEMS=="scsi", GOTO="scsi_identify"
+GOTO="scsi_identify_end"
+LABEL="scsi_identify"
+
+# Set ID_SCSI_INQUIRY to 0 to force running "sg_inq" for obtaining device IDs
+# from SCSI VPDs, rather than looking them up in sysfs (not recommended).
+ENV{ID_SCSI_INQUIRY}=""
+
+# Set enabled unreliable sources for setting the ID_SERIAL property.
+# See 55-scsi-sg3_id.rules for detailed documentation.
+ENV{.SCSI_ID_SERIAL_SRC}="T"
+
+# Set enabled unreliable sources for creating additional /dev/disk/by-id/scsi* symlinks.
+# See 58-scsi-sg3_symlink.rules for detailed documentation.
+ENV{.SCSI_SYMLINK_SRC}=""
+
+LABEL="scsi_identify_end"
diff --git a/scripts/55-scsi-sg3_id.rules b/scripts/55-scsi-sg3_id.rules
index 33b2ad3..5e9732d 100644
--- a/scripts/55-scsi-sg3_id.rules
+++ b/scripts/55-scsi-sg3_id.rules
@@ -36,7 +36,7 @@ KERNEL!="sd*[!0-9]|sr*", GOTO="sg3_utils_id_end"
 # have scanned for VPD pages, so if the vpd page attribute is not
 # present it is not supported (or deemed unsafe to access).
 # Hence we can skip the call to sg_inq and avoid I/O altogether.
-# Set 'ID_SCSI_INQUIRY=0' in an earlier udev rule if the kernel
+# Set ENV{ID_SCSI_INQUIRY}="0" in 00-scsi-sg3_config.rules if the kernel
 # fails to scan VPD pages correctly; the rules will then fall
 # back to calling sg_vpd directly.
 LABEL="scsi_inquiry"
@@ -119,9 +119,7 @@ ENV{ID_SCSI_SERIAL}!="?*", ENV{SCSI_IDENT_SERIAL}=="?*", ENV{ID_SCSI_SERIAL}="$e
 # Be aware that multipath actually needs unique identifiers, though.
 # Using ambiguous identifiers for ID_SERIAL can cause data corruption with multipath.
 #
-# To configure this, add an early rule (e.g. /etc/udev/rules.d/00-scsi-serial.rules) e.g. like this:
-# ACTION!="remove", KERNEL=="sd*|sr*|st*|nst*|cciss*", ENV{.SCSI_ID_SERIAL_SRC}="TLVS"
-#
+# To configure the behavior, set ENV{.SCSI_ID_SERIAL_SRC} in 00-scsi-sg3_config.rules.
 # By default, only T10 vendor ID is allowed.
 ENV{.SCSI_ID_SERIAL_SRC}!="?*", ENV{.SCSI_ID_SERIAL_SRC}="T"
 
diff --git a/scripts/58-scsi-sg3_symlink.rules b/scripts/58-scsi-sg3_symlink.rules
index 99fdc23..dfe8f77 100644
--- a/scripts/58-scsi-sg3_symlink.rules
+++ b/scripts/58-scsi-sg3_symlink.rules
@@ -23,12 +23,8 @@ ENV{UDEV_DISABLE_PERSISTENT_STORAGE_RULES_FLAG}=="1", GOTO="sg3_utils_symlink_en
 # This only needs to be changed if some subsystem, like dm-crypt or LVM, depends on the
 # additional symlinks being present for device identification.
 #
-# To configure the behavior, add an early rule (e.g. /etc/udev/rules.d/00-scsi-serial.rules)
-# like this:
-# ACTION!="remove", KERNEL=="sd*|sr*|st*|nst*|cciss*", ENV{.SCSI_SYMLINK_SRC}="TS"
-#
+# To configure the behavior, set ENV{.SCSI_SYMLINK_SRC} in 00-scsi-sg3_config.rules.
 # By default, no possibly ambiguous additional symlinks will be created.
-ENV{.SCSI_SYMLINK_SRC}!="?*", ENV{.SCSI_SYMLINK_SRC}=""
 
 # 0: vpd page 0x80 identifier
 ENV{.SCSI_SYMLINK_SRC}=="*S*", ENV{SCSI_IDENT_SERIAL}=="?*", ENV{DEVTYPE}=="disk", \
-- 
2.39.2

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