Staging: zram: allow partial page operations

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Commit 7b19b8d45b (zram: Prevent overflow
in logical block size) introduced ZRAM_LOGICAL_BLOCK_SIZE constant to
prevent overflow of logical block size on 64k page kernel.
However, the current implementation of zram only allow operation on block
of the same size as a page. That makes theorically legit 4k requests fail
on 64k page kernel.

This patch makes zram allow operation on partial pages. Basically, it
means we still do operations on full pages internally, but only copy the
relevent segments from/to the user memory.

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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Jerome Marchand 2011-06-10 15:28:48 +02:00 • committed by Greg Kroah-Hartman

parent 8c921b2b43

commit 924bd88d70

2 changed files with 169 additions and 38 deletions

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202

drivers/staging/zram/zram_drv.c

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5

drivers/staging/zram/zram_drv.h

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