From c6a33e2464edd87f8c12cc2d11369a5b44c65b77 Mon Sep 17 00:00:00 2001 From: Albert Lee Date: Wed, 12 Oct 2005 15:12:26 +0800 Subject: [PATCH] libata CHS: LBA28/LBA48 optimization (revise #6) - add lba_28_ok() and lba_48_ok() to ata.h. - check ending block number instead of staring block number. - use lba_28_ok() for CHS range check - LBA28/LBA48 optimization Suggested by Mark Lord and Alan Cox. Signed-off-by: Albert Lee ===== Signed-off-by: Jeff Garzik --- include/linux/ata.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'include/linux/ata.h') diff --git a/include/linux/ata.h b/include/linux/ata.h index 630908c9378b..b7e7e1cb2633 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -291,4 +291,16 @@ static inline int ata_ok(u8 status) == ATA_DRDY); } +static inline int lba_28_ok(u64 block, u32 n_block) +{ + /* check the ending block number */ + return ((block + n_block - 1) < ((u64)1 << 28)) && (n_block <= 256); +} + +static inline int lba_48_ok(u64 block, u32 n_block) +{ + /* check the ending block number */ + return ((block + n_block - 1) < ((u64)1 << 48)) && (n_block <= 65536); +} + #endif /* __LINUX_ATA_H__ */ -- cgit v1.2.3-55-g7522