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authorMikulas Patocka <mpatocka@redhat.com>2013-03-01 23:45:49 +0100
committerAlasdair G Kergon <agk@redhat.com>2013-03-01 23:45:49 +0100
commita26062416ef8add48f16fbadded2b5f6fb84d024 (patch)
tree4f960c51bd22d99e55a1f56cf28f86f018de01a3 /fs/jfs
parentdm ioctl: optimize functions without variable params (diff)
downloadlinux-a26062416ef8add48f16fbadded2b5f6fb84d024.tar.xz
linux-a26062416ef8add48f16fbadded2b5f6fb84d024.zip
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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