f2fs: introduce f2fs_issue_discard() to clean up
Change log from v1:
o fix 32bit drops reported by Dan Carpenter
This patch adds f2fs_issue_discard() to clean up blkdev_issue_discard() flows.
Dan carpenter reported:
"block_t is a 32 bit type and sector_t is a 64 bit type. The upper 32
bits of the sector_t are not used because the shift will wrap."
Bug-Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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