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authorMikulas Patocka <mpatocka@redhat.com>2013-03-01 22:45:49 +0000
committerAlasdair G Kergon <agk@redhat.com>2013-03-01 22:45:49 +0000
commita26062416ef8add48f16fbadded2b5f6fb84d024 (patch)
tree4f960c51bd22d99e55a1f56cf28f86f018de01a3 /firmware
parent02cde50b7ea74557d32ff778c73809322445ccd2 (diff)
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dm ioctl: allow message to return data
This patch introduces enhanced message support that allows the device-mapper core to recognise messages that are common to all devices, and for messages to return data to userspace. Core messages are processed by the function "message_for_md". If the device mapper doesn't support the message, it is passed to the target driver. If the message returns data, the kernel sets the flag DM_MESSAGE_OUT_FLAG. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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