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block: deprecate barrier and replace blk_queue_ordered() with blk_queue_flush()

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Barrier is deemed too heavy and will soon be replaced by FLUSH/FUA
requests.  Deprecate barrier.  All REQ_HARDBARRIERs are failed with
-EOPNOTSUPP and blk_queue_ordered() is replaced with simpler
blk_queue_flush().

blk_queue_flush() takes combinations of REQ_FLUSH and FUA.  If a
device has write cache and can flush it, it should set REQ_FLUSH.  If
the device can handle FUA writes, it should also set REQ_FUA.

All blk_queue_ordered() users are converted.

* ORDERED_DRAIN is mapped to 0 which is the default value.
* ORDERED_DRAIN_FLUSH is mapped to REQ_FLUSH.
* ORDERED_DRAIN_FLUSH_FUA is mapped to REQ_FLUSH | REQ_FUA.

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: Boaz Harrosh <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: Chris Wright <[email protected]>
Cc: FUJITA Tomonori <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Alasdair G Kergon <[email protected]>
Cc: Pierre Ossman <[email protected]>
Cc: Stefan Weinhuber <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2010-09-03 11:56:16 +02:00 • committed by Jens Axboe
commit 4913efe456
15 changed files with 67 additions and 102 deletions
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13
drivers/ide/ide-disk.c
View file

@ -516,10 +516,10 @@ static int ide_do_setfeature(ide_drive_t *drive, u8 feature, u8 nsect)
return ide_no_data_taskfile(drive, &cmd);
}
static void update_ordered(ide_drive_t *drive)
static void update_flush(ide_drive_t *drive)
{
u16 *id = drive->id;
unsigned ordered = QUEUE_ORDERED_NONE;
unsigned flush = 0;
if (drive->dev_flags & IDE_DFLAG_WCACHE) {
unsigned long long capacity;
@ -543,13 +543,12 @@ static void update_ordered(ide_drive_t *drive)
drive->name, barrier ? "" : "not ");
if (barrier) {
ordered = QUEUE_ORDERED_DRAIN_FLUSH;
flush = REQ_FLUSH;
blk_queue_prep_rq(drive->queue, idedisk_prep_fn);
}
} else
ordered = QUEUE_ORDERED_DRAIN;
}
blk_queue_ordered(drive->queue, ordered);
blk_queue_flush(drive->queue, flush);
}
ide_devset_get_flag(wcache, IDE_DFLAG_WCACHE);
@ -572,7 +571,7 @@ static int set_wcache(ide_drive_t *drive, int arg)
}
}
update_ordered(drive);
update_flush(drive);
return err;
}