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bdev: fix alignment math in spdk_bdev_io_set_buf()

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Rather than adding the full alignment size (512), add one less than the
alignment so that already-aligned buffers don't get rounded up again.

Change-Id: I96323b848bfb90f2aa1774b869e2b8a81d253077
Reported-by: Shuhei Matsumoto
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/418879
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
Daniel Verkamp 2018-07-10 13:24:43 -07:00
parent 58d8a4564b
commit d53545eff7
1 changed files with 1 additions and 1 deletions
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lib/bdev/bdev.c
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@ -393,7 +393,7 @@ spdk_bdev_io_set_buf(struct spdk_bdev_io *bdev_io, void *buf, size_t len)
}
if (buf != NULL) {
aligned_buf = (void *)(((uintptr_t)buf + 512) & ~511UL);
aligned_buf = (void *)(((uintptr_t)buf + 511) & ~511UL);
len = len - ((uintptr_t)aligned_buf - (uintptr_t)buf);
} else {
aligned_buf = NULL;