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author | David Woodhouse <David.Woodhouse@intel.com> | 2008-08-05 13:01:53 -0400 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2008-10-09 02:56:01 -0400 |
commit | fb2dce862d9f9a68e6b9374579056ec9eca02a63 (patch) | |
tree | 888e0fd7248c9329fa1aa3981043a2dc2457d488 /Documentation/i2c | |
parent | d628eaef310533767ce68664873869c2d7f78f09 (diff) |
Add 'discard' request handling
Some block devices benefit from a hint that they can forget the contents
of certain sectors. Add basic support for this to the block core, along
with a 'blkdev_issue_discard()' helper function which issues such
requests.
The caller doesn't get to provide an end_io functio, since
blkdev_issue_discard() will automatically split the request up into
multiple bios if appropriate. Neither does the function wait for
completion -- it's expected that callers won't care about when, or even
_if_, the request completes. It's only a hint to the device anyway. By
definition, the file system doesn't _care_ about these sectors any more.
[With feedback from OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> and
Jens Axboe <jens.axboe@oracle.com]
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'Documentation/i2c')
0 files changed, 0 insertions, 0 deletions