dm: introduce num_flush_requests

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Introduce num_flush_requests for a target to set to say how many flush
instructions (empty barriers) it wants to receive.  These are sent by
__clone_and_map_empty_barrier with map_info->flush_request going from 0
to (num_flush_requests - 1).

Old targets without flush support won't receive any flush requests.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

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Mikulas Patocka 2009-06-22 10:12:20 +01:00 • committed by Alasdair G Kergon

parent 27eaa14975

commit f9ab94cee3

2 changed files with 50 additions and 0 deletions

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39

drivers/md/dm.c

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11

include/linux/device-mapper.h

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