Christoph Hellwig c15227de13 block: use normal I/O path for discard requests ... prepare_discard_fn() was being called in a place where memory allocation was effectively impossible. This makes it inappropriate for all but the most trivial translations of Linux's DISCARD operation to the block command set. Additionally adding a payload there makes the ownership of the bio backing unclear as it's now allocated by the device driver and not the submitter as usual. It is replaced with QUEUE_FLAG_DISCARD which is used to indicate whether the queue supports discard operations or not. blkdev_issue_discard now allocates a one-page, sector-length payload which is the right thing for the common ATA and SCSI implementations. The mtd implementation of prepare_discard_fn() is replaced with simply checking for the request being a discard. Largely based on a previous patch from Matthew Wilcox <matthew@wil.cx> which did the prepare_discard_fn but not the different payload allocation yet. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		2009-10-01 21:19:30 +02:00
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chips
devices
lpddr
maps
nand
onenand
tests
ubi
afs.c
ar7part.c
cmdlinepart.c
ftl.c
inftlcore.c
inftlmount.c
internal.h
Kconfig
Makefile
mtd_blkdevs.c
mtdbdi.c
mtdblock_ro.c
mtdblock.c
mtdchar.c
mtdconcat.c
mtdcore.c
mtdcore.h
mtdoops.c
mtdpart.c
mtdsuper.c
nftlcore.c
nftlmount.c
ofpart.c
redboot.c
rfd_ftl.c
ssfdc.c