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Docs clarification

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4116 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Vladislav Bolkhovitin
2012-02-08 19:08:53 +00:00
parent 25ccc656d9
commit 3f6ecca6ff
1 changed files with 12 additions and 2 deletions
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14
doc/scst_user_spec.sgml
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@@ -459,9 +459,19 @@ where:
<item> <bf/SCST_EXEC_REPLY_BACKGROUND/ - tells SCST send to the remote
initiator GOOD status, but the command not yet completed by the
user space handler, it is being executed in the background. When
it will be completed, the user space handler will call
it completed, the user space handler must call
SCST_USER_REPLY_CMD again with reply_type
SCST_EXEC_REPLY_COMPLETED.
SCST_EXEC_REPLY_COMPLETED. This mode can be used only for WRITEs
and with no mem reuse for them. Also in this mode
SCST_USER_ON_FREE_CMD_IGNORE supposed to be used.
SCST_USER_ON_FREE_CMD_IGNORE should be OK, because in this mode
the user space handler knows when this memory can be reused
(SCST_EXEC_REPLY_COMPLETED time). In case if the user space
handler finishes before SCST sent reply to the initiator, SCST
can still have reference to that memory, but it is harmless,
because SCST is not going to touch this memory anyhow in this
processing path, because WRITEs are not sending data, so this
memory can be safely reused for other needs.
<item> <bf/SCST_EXEC_REPLY_COMPLETED/ - the user space handler completed the command
</itemize>