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TM handling improvements

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TM actions should be done only after all affected commands done to avoid
possibility that any of them be executed with newly set parameters.



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4217 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2012-04-19 17:46:36 +00:00
parent eb95049061
commit 64699a540a
9 changed files with 301 additions and 163 deletions
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doc/scst_user_spec.sgml
+23 -9
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@@ -1084,11 +1084,12 @@ where:
</itemize>
<sect1> SCST_USER_TASK_MGMT
<sect1> SCST_USER_TASK_MGMT_RECEIVED
<p>
SCST_USER_TASK_MGMT subcommand returns a task management functions.
Payload contains struct scst_user_tm, which is defined as the following:
SCST_USER_TASK_MGMT_RECEIVED subcommand notifies that a task management
function has been received. Payload contains struct scst_user_tm, which
is defined as the following:
<verb>
struct scst_user_tm
@@ -1118,12 +1119,8 @@ where:
<item> <bf/cmd_sn_set/ - specifies if cmd_sn is valid
</itemize>
After TM function is completed, the user space device handler shall
reply using "result" field of the corresponding reply command. It isn't
necessary to wait for aborted command(s) finished, the result of TM
function shall be returned immediately. SCST core will take care that
the reply to the TM function isn't sent before all affection SCSI
commands finished.
On this notification dev handler should do the best to ensure that all
aborted by this TM command SCSI commands complete ASAP.
Possible values of <it/fn/ field:
@@ -1147,6 +1144,23 @@ Possible values of <it/fn/ field:
<item> <bf/SCST_ABORT_ALL_TASKS/ - all tasks shall be aborted
</itemize>
The "result" field of the corresponding reply command is ignored for
this subcommand.
<sect1> SCST_USER_TASK_MGMT_DONE
<p>
SCST_USER_TASK_MGMT_DONE subcommand notifies that all aborted by task
management function commands have finished, so the dev handler can
perform actual actions required by this TM command. For instance, reset
all MODE PAGES variables to default values.
Payload contains struct scst_user_tm, which was defined above.
After the TM function is completed, the device handler shall reply using
"result" field of the corresponding reply command.
Possible return values are:
<itemize>