Re: [PATCH 00/35 v2] separate operations from flags in the bio/request structs

[Mike Snitzer <snitzer@redhat.com>]

On Fri, Jan 08 2016 at  3:50P -0500,
Mike Christie <michaelc@cs.wisc.edu> wrote:

> On 01/08/2016 07:32 AM, Christoph Hellwig wrote:
> > This looks good to me from a highlevel point of view.
> > Do you also have a git tree to take a look at all the changes in a
> > single big diff?
> 
> I uploaded a git tree here:
> 
> https://github.com/mikechristie/linux-kernel.git
> 
> based off of linux-next today. The patches are just in the master branch.

Hi Mike,

I had a look at your DM changes.  That sucked (but things looked good).
So much so that I want to thank you for tackling this task (and taking
one for the team).

I'll get this kernel built and tested (using the various DM testsuites:
lvm2, cryptsetup, device-mapper-test-suite for dm-thinp and dm-cache).

But I did make some changes during my review that I'd appreciate if
you'd fold in to wherever you think it appropriate in your series:

diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index 96b5c1b..9e29dba 100644
--- a/drivers/md/dm-stats.c
+++ b/drivers/md/dm-stats.c
@@ -514,11 +514,10 @@ static void dm_stat_round(struct dm_stat *s, struct dm_stat_shared *shared,
 }
 
 static void dm_stat_for_entry(struct dm_stat *s, size_t entry,
-			      unsigned long bi_rw, sector_t len,
+			      int idx, sector_t len,
 			      struct dm_stats_aux *stats_aux, bool end,
 			      unsigned long duration_jiffies)
 {
-	unsigned long idx = bi_rw;
 	struct dm_stat_shared *shared = &s->stat_shared[entry];
 	struct dm_stat_percpu *p;
 
@@ -584,7 +583,7 @@ static void dm_stat_for_entry(struct dm_stat *s, size_t entry,
 #endif
 }
 
-static void __dm_stat_bio(struct dm_stat *s, unsigned long bi_rw,
+static void __dm_stat_bio(struct dm_stat *s, int bi_rw,
 			  sector_t bi_sector, sector_t end_sector,
 			  bool end, unsigned long duration_jiffies,
 			  struct dm_stats_aux *stats_aux)
@@ -622,7 +621,7 @@ static void __dm_stat_bio(struct dm_stat *s, unsigned long bi_rw,
 	} while (unlikely(todo != 0));
 }
 
-void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw,
+void dm_stats_account_io(struct dm_stats *stats, int bi_rw,
 			 sector_t bi_sector, unsigned bi_sectors, bool end,
 			 unsigned long duration_jiffies,
 			 struct dm_stats_aux *stats_aux)
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 5e940f7..9a4b3cb 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1326,7 +1326,7 @@ static int device_fua_capable(struct dm_target *ti, struct dm_dev *dev,
 }
 
 static bool dm_table_supports_flush(struct dm_table *t,
-				    iterate_devices_callout_fn support_test)
+				    iterate_devices_callout_fn callout_fn)
 {
 	struct dm_target *ti;
 	unsigned i = 0;
@@ -1347,7 +1347,7 @@ static bool dm_table_supports_flush(struct dm_table *t,
 			return true;
 
 		if (ti->type->iterate_devices &&
-		    ti->type->iterate_devices(ti, support_test, NULL))
+		    ti->type->iterate_devices(ti, callout_fn, NULL))
 			return true;
 	}