swap: Add swap slot free callback to block_device_operations

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This callback is required when RAM based devices are used as swap disks.
One such device is ramzswap which is used as compressed in-memory swap
disk.  For such devices, we need a callback as soon as a swap slot is no
longer used to allow freeing memory allocated for this slot.  Without this
callback, stale data can quickly accumulate in memory defeating the whole
purpose of such devices.

Signed-off-by: Nitin Gupta <ngupta@vflare.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Nigel Cunningham <nigel@tuxonice.net>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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Nitin Gupta 2010-05-17 11:02:43 +05:30 • committed by Greg Kroah-Hartman

parent b272564395

commit b3a27d0529

2 changed files with 6 additions and 0 deletions

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2

include/linux/blkdev.h

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4

mm/swapfile.c

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