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From f60e89ea4c38c11a9d0c1e642c0a78faa32aca56 Mon Sep 17 00:00:00 2001
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From: Joerg Steffens <joerg.steffens@bareos.com>
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Date: Tue, 21 Nov 2017 12:21:49 +0100
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Subject: [PATCH] udev-rules: make tape-changers also apprear in
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/dev/tape/by-path/
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It is important to be able to access tape changer ("Medium Changers") by
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persistant name.
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While tape devices can be accessed via /dev/tape/by-id/ and
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/dev/tape/by-path/, tape-changers could only be accessed by
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/dev/tape/by-id/.
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However, in some cases, especially when accessing Amazon Webservice
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Storage Gateway VTLs (or accessing iSCSI VTLs in general?) this does not
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work, as all tape devices and the tape changer have the same ENV{ID_SERIAL}.
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The results is, that only the last device is available in
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/dev/tape/by-id/, as the former devices have been overwritten.
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As this behavior is hard to change without breaking consistentcy,
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this additional device in /dev/tape/by-path/ can be used to access the medium changes.
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The tape devices can also be accessed by this path.
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The content of the directory will now look like:
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# SCSI tape device, rewind (unchanged)
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/dev/tape/by-path/$env{ID_PATH} -> ../../st*
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# SCSI tape device, no-rewind (unchanged)
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/dev/tape/by-path/$env{ID_PATH}-nst -> ../../nst*
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# SCSI tape changer device (newly added)
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/dev/tape/by-path/$env{ID_PATH}-changer -> ../../sg*
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Tape devices and tape changer have different ID_PATHs.
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SCSI tape changer get the suffix "-changer"
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to make them better distinguishable from tape devices.
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(cherry picked from commit 7f8ddf96a25162f06bd94a684cf700c128d18142)
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Resolves: #1820112
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---
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rules/60-persistent-storage-tape.rules | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/rules/60-persistent-storage-tape.rules b/rules/60-persistent-storage-tape.rules
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index b604864ee8..0575f308df 100644
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--- a/rules/60-persistent-storage-tape.rules
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+++ b/rules/60-persistent-storage-tape.rules
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@@ -9,6 +9,9 @@ ENV{UDEV_DISABLE_PERSISTENT_STORAGE_RULES_FLAG}=="1", GOTO="persistent_storage_t
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SUBSYSTEM=="scsi_generic", SUBSYSTEMS=="scsi", ATTRS{type}=="8", IMPORT{program}="scsi_id --sg-version=3 --export --whitelisted -d $devnode", \
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SYMLINK+="tape/by-id/scsi-$env{ID_SERIAL}"
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+SUBSYSTEM=="scsi_generic", SUBSYSTEMS=="scsi", ATTRS{type}=="8", IMPORT{builtin}="path_id", \
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+ SYMLINK+="tape/by-path/$env{ID_PATH}-changer"
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+
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SUBSYSTEM!="scsi_tape", GOTO="persistent_storage_tape_end"
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KERNEL=="st*[0-9]|nst*[0-9]", ATTRS{ieee1394_id}=="?*", ENV{ID_SERIAL}="$attr{ieee1394_id}", ENV{ID_BUS}="ieee1394"
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