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author | Keith Wansbrough <keith@lochan.org> | 2008-09-22 17:57:17 -0400 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2008-10-09 02:56:19 -0400 |
commit | 9e49184c82e9ec3ab4d45f9ea5a17ccaf43869f0 (patch) | |
tree | 532d70e75854e1f7c070d4818f3b44cefe528d3e /block/as-iosched.c | |
parent | 061837bc8687edc2739ef02f721b7ae0b8076390 (diff) |
floppy: support arbitrary first-sector numbers
The current floppy_struct allows floppies to number sectors starting
from 0 or 1. This patch allows arbitrary first-sector numbers - for
example, 0xC1 for Amstrad CPC disks.
This extends the existing 1-bit field (FD_ZEROBASED, bit 2 of stretch)
to 8 bits (FD_SECTMASK, bits 2 to 9).
Currently 0x00 denotes a first sector number of 1, and 0x01 denotes a
first sector number of 0. We extend this by interpreting FD_SECTMASK
as the first sector number with the LSB flipped.
Signed-off-by: Keith Wansbrough <keith@lochan.org>
Cc: Alain Knaff <alain@linux.lu>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
Cc: Karel Zak <kzak@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/as-iosched.c')
0 files changed, 0 insertions, 0 deletions