Files
linux/fs
Martin K. Petersen c72758f337 block: Export I/O topology for block devices and partitions
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>
2009-05-22 23:22:55 +02:00
..
2009-04-02 19:05:08 -07:00
2009-04-20 23:01:15 -04:00
2009-04-08 10:21:43 -07:00
2009-01-22 13:15:57 +03:00
2009-05-21 22:38:08 +00:00
2009-04-02 19:05:09 -07:00
2009-05-11 09:50:53 +02:00
2009-04-17 09:32:11 -07:00
2009-01-22 13:15:58 +03:00
2009-04-13 15:04:29 -07:00
2009-03-31 23:00:26 -04:00
2009-04-20 23:02:51 -04:00
2009-05-11 17:23:14 -04:00
2009-04-02 19:05:10 -07:00
2009-04-20 23:02:50 -04:00
2009-04-02 19:05:10 -07:00
2009-03-27 14:44:03 -04:00
2009-03-31 23:00:27 -04:00
2009-05-09 10:49:40 -04:00
2009-04-02 19:04:48 -07:00
2009-03-31 23:00:26 -04:00
2009-04-07 08:31:16 -07:00
2009-04-07 08:31:16 -07:00
2009-04-20 23:02:52 -04:00
2009-02-18 15:37:53 -08:00
2009-04-20 23:02:50 -04:00