![]() To support devices with physical block sizes bigger than 512 bytes we need to ensure proper alignment. This patch adds support for exposing I/O topology characteristics as devices are stacked. logical_block_size is the smallest unit the device can address. physical_block_size indicates the smallest I/O the device can write without incurring a read-modify-write penalty. The io_min parameter is the smallest preferred I/O size reported by the device. In many cases this is the same as the physical block size. However, the io_min parameter can be scaled up when stacking (RAID5 chunk size > physical block size). The io_opt characteristic indicates the optimal I/O size reported by the device. This is usually the stripe width for arrays. The alignment_offset parameter indicates the number of bytes the start of the device/partition is offset from the device's natural alignment. Partition tools and MD/DM utilities can use this to pad their offsets so filesystems start on proper boundaries. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com> |
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acorn.c | ||
acorn.h | ||
amiga.c | ||
amiga.h | ||
atari.c | ||
atari.h | ||
check.c | ||
check.h | ||
efi.c | ||
efi.h | ||
ibm.c | ||
ibm.h | ||
karma.c | ||
karma.h | ||
Kconfig | ||
ldm.c | ||
ldm.h | ||
mac.c | ||
mac.h | ||
Makefile | ||
msdos.c | ||
msdos.h | ||
osf.c | ||
osf.h | ||
sgi.c | ||
sgi.h | ||
sun.c | ||
sun.h | ||
sysv68.c | ||
sysv68.h | ||
ultrix.c | ||
ultrix.h |