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authorNeilBrown <neilb@suse.de>2009-10-16 01:40:25 -0400
committerNeilBrown <neilb@suse.de>2009-10-16 01:40:25 -0400
commit5dd33c9a4c29015f6d87568d33521c98931a387e (patch)
treea79ac38e1957580743b708410b54694f2b1cbf77 /fs/jffs2
parent5e5e3e78ed9038b8f7112835d07084eefb9daa47 (diff)
md/async: don't pass a memory pointer as a page pointer.
md/raid6 passes a list of 'struct page *' to the async_tx routines, which then either DMA map them for offload, or take the page_address for CPU based calculations. For RAID6 we sometime leave 'blanks' in the list of pages. For CPU based calcs, we want to treat theses as a page of zeros. For offloaded calculations, we simply don't pass a page to the hardware. Currently the 'blanks' are encoded as a pointer to raid6_empty_zero_page. This is a 4096 byte memory region, not a 'struct page'. This is mostly handled correctly but is rather ugly. So change the code to pass and expect a NULL pointer for the blanks. When taking page_address of a page, we need to check for a NULL and in that case use raid6_empty_zero_page. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'fs/jffs2')
0 files changed, 0 insertions, 0 deletions