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From: Jeffle Xu <[email protected]>
To: [email protected]
Cc: [email protected], [email protected],
	[email protected]
Subject: [PATCH RFC 4/7] block: define blk_qc_t as uintptr_t
Date: Wed, 23 Dec 2020 19:26:21 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

To support iopoll for bio-based device, the returned cookie is actually
a pointer to an implementation specific object, e.g. an object
maintaining all split bios.

In such case, blk_qc_t should be large enough to contain one pointer,
for which uintptr_t is used here. Since uintptr_t is actually an integer
type in essence, there's no need of type casting in the original mq
path, while type casting is indeed needed in bio-based routine.

Signed-off-by: Jeffle Xu <[email protected]>
---
 include/linux/types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/types.h b/include/linux/types.h
index da5ca7e1bea9..f6301014a459 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -126,7 +126,7 @@ typedef u64 sector_t;
 typedef u64 blkcnt_t;
 
 /* cookie used for IO polling */
-typedef unsigned int blk_qc_t;
+typedef uintptr_t blk_qc_t;
 
 /*
  * The type of an index into the pagecache.
-- 
2.27.0


  parent reply	other threads:[~2020-12-23 11:27 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-23 11:26 [PATCH RFC 0/7] dm: add support of iopoll Jeffle Xu
2020-12-23 11:26 ` [PATCH RFC 1/7] block: move definition of blk_qc_t to types.h Jeffle Xu
2021-01-07 19:04   ` Mike Snitzer
2020-12-23 11:26 ` [PATCH RFC 2/7] block: add helper function fetching gendisk from queue Jeffle Xu
2021-01-07 20:31   ` Mike Snitzer
2020-12-23 11:26 ` [PATCH RFC 3/7] block: add iopoll method for non-mq device Jeffle Xu
2021-01-07 21:47   ` Mike Snitzer
2021-01-08  3:24     ` [dm-devel] " JeffleXu
2021-01-08 17:33       ` Mike Snitzer
2021-01-11  7:50         ` [dm-devel] " JeffleXu
2020-12-23 11:26 ` Jeffle Xu [this message]
2021-01-07 21:52   ` [PATCH RFC 4/7] block: define blk_qc_t as uintptr_t Mike Snitzer
2020-12-23 11:26 ` [PATCH RFC 5/7] dm: always return BLK_QC_T_NONE for bio-based device Jeffle Xu
2021-01-07 21:54   ` Mike Snitzer
2020-12-23 11:26 ` [PATCH RFC 6/7] block: track cookies of split bios " Jeffle Xu
2021-01-07 22:18   ` Mike Snitzer
2021-01-08  3:08     ` [dm-devel] " JeffleXu
2021-01-08 17:26       ` Mike Snitzer
2021-01-12  5:46         ` [dm-devel] " JeffleXu
2021-01-12 16:13           ` Mike Snitzer
2021-01-14  9:16             ` [dm-devel] " JeffleXu
2021-01-14 14:30               ` Mike Snitzer
2021-01-12  7:11         ` [dm-devel] " JeffleXu
2020-12-23 11:26 ` [PATCH RFC 7/7] dm: add support for IO polling Jeffle Xu
2021-01-08  3:12   ` [dm-devel] " JeffleXu
2021-01-07  1:14 ` [dm-devel] [PATCH RFC 0/7] dm: add support of iopoll JeffleXu

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