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block: discard granularity might not be power of 2

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In MD raid case, discard granularity might not be power of 2, for example, a
4-disk raid5 has 3*chunk_size discard granularity. Correct the calculation for
such cases.

Reported-by: Neil Brown <[email protected]>
Signed-off-by: Shaohua Li <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Shaohua Li 2012-12-14 11:15:36 +08:00 • committed by Jens Axboe
commit 8dd2cb7e88
3 changed files with 20 additions and 16 deletions
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6
block/blk-settings.c
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@ -611,7 +611,7 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
bottom = b->discard_granularity + alignment;
/* Verify that top and bottom intervals line up */
if (max(top, bottom) & (min(top, bottom) - 1))
if ((max(top, bottom) % min(top, bottom)) != 0)
t->discard_misaligned = 1;
}
@ -619,8 +619,8 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
b->max_discard_sectors);
t->discard_granularity = max(t->discard_granularity,
b->discard_granularity);
t->discard_alignment = lcm(t->discard_alignment, alignment) &
(t->discard_granularity - 1);
t->discard_alignment = lcm(t->discard_alignment, alignment) %
t->discard_granularity;
}
return ret;