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mchristi at redhat.com

2016-Apr-15 10:40 UTC

[Ocfs2-devel] [PATCH 41/42] block: do not use REQ_FLUSH for tracking flush support

From: Mike Christie <mchristi at redhat.com>

The last patch added a REQ_OP_FLUSH for request_fn drivers
and the next patch renames REQ_FLUSH to REQ_PREFLUSH which
will be used by file systems and make_request_fn drivers so
they can send a write/flush combo.

This patch drops xen's use of REQ_FLUSH to track if it supports
REQ_OP_FLUSH requests, so REQ_FLUSH can be deleted.

v6:
- Dropped parts of patch handled by Jens's QUEUE_FLAG_WC/FUA
patches and modified patch to check feature_flush/fua bits.

Signed-off-by: Mike Christie <mchristi at redhat.com>
Reviewed-by: Hannes Reinecke <hare at suse.com>
---
 drivers/block/xen-blkfront.c | 47 ++++++++++++++++++++++----------------------
 1 file changed, 24 insertions(+), 23 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index f01691a..d6429e7 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -196,6 +196,7 @@ struct blkfront_info
 	unsigned int nr_ring_pages;
 	struct request_queue *rq;
 	unsigned int feature_flush;
+	unsigned int feature_fua;
 	unsigned int feature_discard:1;
 	unsigned int feature_secdiscard:1;
 	unsigned int discard_granularity;
@@ -763,19 +764,14 @@ static int blkif_queue_rw_req(struct request *req, struct
blkfront_ring_info *ri
 			 * implement it the same way.  (It's also a FLUSH+FUA,
 			 * since it is guaranteed ordered WRT previous writes.)
 			 */
-			switch (info->feature_flush &
-				((REQ_FLUSH|REQ_FUA))) {
-			case REQ_FLUSH|REQ_FUA:
+			if (info->feature_flush && info->feature_fua)
 				ring_req->operation  					BLKIF_OP_WRITE_BARRIER;
-				break;
-			case REQ_FLUSH:
+			else if (info->feature_flush)
 				ring_req->operation  					BLKIF_OP_FLUSH_DISKCACHE;
-				break;
-			default:
+			else
 				ring_req->operation = 0;
-			}
 		}
 		ring_req->u.rw.nr_segments = num_grant;
 		if (unlikely(require_extra_req)) {
@@ -866,9 +862,9 @@ static inline bool blkif_request_flush_invalid(struct
request *req,
 {
 	return ((req->cmd_type != REQ_TYPE_FS) ||
 		((req->op == REQ_OP_FLUSH) &&
-		 !(info->feature_flush & REQ_FLUSH)) ||
+		 !info->feature_flush) ||
 		((req->cmd_flags & REQ_FUA) &&
-		 !(info->feature_flush & REQ_FUA)));
+		 !info->feature_fua));
 }
 
 static int blkif_queue_rq(struct blk_mq_hw_ctx *hctx,
@@ -985,24 +981,22 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16
sector_size,
 	return 0;
 }
 
-static const char *flush_info(unsigned int feature_flush)
+static const char *flush_info(struct blkfront_info *info)
 {
-	switch (feature_flush & ((REQ_FLUSH | REQ_FUA))) {
-	case REQ_FLUSH|REQ_FUA:
+	if (info->feature_flush && info->feature_fua)
 		return "barrier: enabled;";
-	case REQ_FLUSH:
+	else if (info->feature_fua)
 		return "flush diskcache: enabled;";
-	default:
+	else
 		return "barrier or flush: disabled;";
-	}
 }
 
 static void xlvbd_flush(struct blkfront_info *info)
 {
-	blk_queue_write_cache(info->rq, info->feature_flush & REQ_FLUSH,
-				info->feature_flush & REQ_FUA);
+	blk_queue_write_cache(info->rq, info->feature_flush ? true : false,
+			      info->feature_flush ? true : false);
 	pr_info("blkfront: %s: %s %s %s %s %s\n",
-		info->gd->disk_name, flush_info(info->feature_flush),
+		info->gd->disk_name, flush_info(info),
 		"persistent grants:", info->feature_persistent ?
 		"enabled;" : "disabled;", "indirect
descriptors:",
 		info->max_indirect_segments ? "enabled;" :
"disabled;");
@@ -1621,6 +1615,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
 			if (unlikely(error)) {
 				if (error == -EOPNOTSUPP)
 					error = 0;
+				info->feature_fua = 0;
 				info->feature_flush = 0;
 				xlvbd_flush(info);
 			}
@@ -2315,6 +2310,7 @@ static void blkfront_gather_backend_features(struct
blkfront_info *info)
 	unsigned int indirect_segments;
 
 	info->feature_flush = 0;
+	info->feature_fua = 0;
 
 	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
 			"feature-barrier", "%d", &barrier,
@@ -2327,8 +2323,11 @@ static void blkfront_gather_backend_features(struct
blkfront_info *info)
 	 *
 	 * If there are barriers, then we use flush.
 	 */
-	if (!err && barrier)
-		info->feature_flush = REQ_FLUSH | REQ_FUA;
+	if (!err && barrier) {
+		info->feature_flush = 1;
+		info->feature_fua = 1;
+	}
+
 	/*
 	 * And if there is "feature-flush-cache" use that above
 	 * barriers.
@@ -2337,8 +2336,10 @@ static void blkfront_gather_backend_features(struct
blkfront_info *info)
 			"feature-flush-cache", "%d", &flush,
 			NULL);
 
-	if (!err && flush)
-		info->feature_flush = REQ_FLUSH;
+	if (!err && flush) {
+		info->feature_flush = 1;
+		info->feature_fua = 0;
+	}
 
 	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
 			"feature-discard", "%d", &discard,
-- 
2.7.2

Juergen Gross

2016-Apr-15 10:50 UTC

head link

[Ocfs2-devel] [PATCH 41/42] block: do not use REQ_FLUSH for tracking flush support

On 15/04/16 12:40, mchristi at redhat.com wrote:> From: Mike Christie <mchristi at redhat.com>
> 
> The last patch added a REQ_OP_FLUSH for request_fn drivers
> and the next patch renames REQ_FLUSH to REQ_PREFLUSH which
> will be used by file systems and make_request_fn drivers so
> they can send a write/flush combo.
> 
> This patch drops xen's use of REQ_FLUSH to track if it supports
> REQ_OP_FLUSH requests, so REQ_FLUSH can be deleted.
> 
> v6:
> - Dropped parts of patch handled by Jens's QUEUE_FLAG_WC/FUA
> patches and modified patch to check feature_flush/fua bits.
> 
> Signed-off-by: Mike Christie <mchristi at redhat.com>
> Reviewed-by: Hannes Reinecke <hare at suse.com>
> ---
>  drivers/block/xen-blkfront.c | 47
++++++++++++++++++++++----------------------
>  1 file changed, 24 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
> index f01691a..d6429e7 100644
> --- a/drivers/block/xen-blkfront.c
> +++ b/drivers/block/xen-blkfront.c
...
> @@ -985,24 +981,22 @@ static int xlvbd_init_blk_queue(struct gendisk *gd,
u16 sector_size,
>  	return 0;
>  }
>  
> -static const char *flush_info(unsigned int feature_flush)
> +static const char *flush_info(struct blkfront_info *info)
>  {
> -	switch (feature_flush & ((REQ_FLUSH | REQ_FUA))) {
> -	case REQ_FLUSH|REQ_FUA:
> +	if (info->feature_flush && info->feature_fua)
>  		return "barrier: enabled;";
> -	case REQ_FLUSH:
> +	else if (info->feature_fua)
Shouldn't this test feature_flush?
>  		return "flush diskcache: enabled;";
> -	default:
> +	else
>  		return "barrier or flush: disabled;";
> -	}
>  }
>  
>  static void xlvbd_flush(struct blkfront_info *info)
>  {
> -	blk_queue_write_cache(info->rq, info->feature_flush &
REQ_FLUSH,
> -				info->feature_flush & REQ_FUA);
> +	blk_queue_write_cache(info->rq, info->feature_flush ? true : false,
> +			      info->feature_flush ? true : false);
And here the second test should be feature_fua?
>  	pr_info("blkfront: %s: %s %s %s %s %s\n",
> -		info->gd->disk_name, flush_info(info->feature_flush),
> +		info->gd->disk_name, flush_info(info),
>  		"persistent grants:", info->feature_persistent ?
>  		"enabled;" : "disabled;", "indirect
descriptors:",
>  		info->max_indirect_segments ? "enabled;" :
"disabled;");

Juergen

Mike Christie

2016-Apr-15 18:58 UTC

head link

[Ocfs2-devel] [PATCH 41/42] block: do not use REQ_FLUSH for tracking flush support

On 04/15/2016 05:50 AM, Juergen Gross wrote:> On 15/04/16 12:40, mchristi at redhat.com wrote:
>> From: Mike Christie <mchristi at redhat.com>
>>
>> The last patch added a REQ_OP_FLUSH for request_fn drivers
>> and the next patch renames REQ_FLUSH to REQ_PREFLUSH which
>> will be used by file systems and make_request_fn drivers so
>> they can send a write/flush combo.
>>
>> This patch drops xen's use of REQ_FLUSH to track if it supports
>> REQ_OP_FLUSH requests, so REQ_FLUSH can be deleted.
>>
>> v6:
>> - Dropped parts of patch handled by Jens's QUEUE_FLAG_WC/FUA
>> patches and modified patch to check feature_flush/fua bits.
>>
>> Signed-off-by: Mike Christie <mchristi at redhat.com>
>> Reviewed-by: Hannes Reinecke <hare at suse.com>
>> ---
>>  drivers/block/xen-blkfront.c | 47
++++++++++++++++++++++----------------------
>>  1 file changed, 24 insertions(+), 23 deletions(-)
>>
>> diff --git a/drivers/block/xen-blkfront.c
b/drivers/block/xen-blkfront.c
>> index f01691a..d6429e7 100644
>> --- a/drivers/block/xen-blkfront.c
>> +++ b/drivers/block/xen-blkfront.c
> 
> ...
> 
>> @@ -985,24 +981,22 @@ static int xlvbd_init_blk_queue(struct gendisk
*gd, u16 sector_size,
>>  	return 0;
>>  }
>>  
>> -static const char *flush_info(unsigned int feature_flush)
>> +static const char *flush_info(struct blkfront_info *info)
>>  {
>> -	switch (feature_flush & ((REQ_FLUSH | REQ_FUA))) {
>> -	case REQ_FLUSH|REQ_FUA:
>> +	if (info->feature_flush && info->feature_fua)
>>  		return "barrier: enabled;";
>> -	case REQ_FLUSH:
>> +	else if (info->feature_fua)
> 
> Shouldn't this test feature_flush?
> 
>>  		return "flush diskcache: enabled;";
>> -	default:
>> +	else
>>  		return "barrier or flush: disabled;";
>> -	}
>>  }
>>  
>>  static void xlvbd_flush(struct blkfront_info *info)
>>  {
>> -	blk_queue_write_cache(info->rq, info->feature_flush &
REQ_FLUSH,
>> -				info->feature_flush & REQ_FUA);
>> +	blk_queue_write_cache(info->rq, info->feature_flush ? true :
false,
>> +			      info->feature_flush ? true : false);
> 
> And here the second test should be feature_fua?
> 
You are right. Will fix up and resend.

Ocfs2 devel - Apr 2016 - [PATCH 41/42] block: do not use REQ_FLUSH for tracking flush support

[Ocfs2-devel] [PATCH 41/42] block: do not use REQ_FLUSH for tracking flush support

[Ocfs2-devel] [PATCH 41/42] block: do not use REQ_FLUSH for tracking flush support

[Ocfs2-devel] [PATCH 41/42] block: do not use REQ_FLUSH for tracking flush support