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From: Paolo Valente <paolo.valente@linaro.org>
To: Jens Axboe <axboe@kernel.dk>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Tejun Heo <tj@kernel.org>, Li Zefan <lizefan@huawei.com>,
	Angelo Ruocco <angeloruocco90@gmail.com>,
	Dennis Zhou <dennis@kernel.org>,
	Josef Bacik <josef@toxicpanda.com>,
	Liu Bo <bo.liu@linux.alibaba.com>,
	Bart Van Assche <bvanassche@acm.org>,
	Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	ulf.hansson@linaro.org, linus.walleij@linaro.org,
	broonie@kernel.org, bfq-iosched@googlegroups.com,
	oleksandr@natalenko.name, cgroups@vger.kernel.org,
	linux-doc@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
	Paolo Valente <paolo.valente@linaro.org>
Subject: [PATCH V2 02/10] block, cgroup: pass cftype to functions that need to use it
Date: Mon, 19 Nov 2018 11:34:16 +0100	[thread overview]
Message-ID: <20181119103424.3853-3-paolo.valente@linaro.org> (raw)
In-Reply-To: <20181119103424.3853-1-paolo.valente@linaro.org>

Some seq_show functions need to access the cftype they belong to, for
retrieving the data to show. These functions get their cftype by using
the seq_cft accessor for the seq_file. This solution is no longer
viable in case a seq_file is shared among more than one cftype,
because the accessor always returns (only) the first of the cftypes
sharing the seq_file.

This commit enables these seq_show functions to be passed their
cftype, by replacing their prototype with that of the newly defined
seq_show_cft hook, and by invoking these functions through this new
hook.

Signed-off-by: Angelo Ruocco <angeloruocco90@gmail.com>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
---
 block/bfq-cgroup.c         | 54 ++++++++++++++++++++++++----------------------
 block/blk-cgroup.c         | 22 ++++++++++++-------
 block/blk-throttle.c       |  8 +++----
 include/linux/blk-cgroup.h | 10 +++++----
 4 files changed, 52 insertions(+), 42 deletions(-)

diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index a7a1712632b0..038e418fa64f 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -918,17 +918,17 @@ static ssize_t bfq_io_set_weight(struct kernfs_open_file *of,
 }
 
 #ifdef CONFIG_DEBUG_BLK_CGROUP
-static int bfqg_print_stat(struct seq_file *sf, void *v)
+static int bfqg_print_stat(struct seq_file *sf, struct cftype *cft, void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_stat,
-			  &blkcg_policy_bfq, seq_cft(sf)->private, false);
+			  &blkcg_policy_bfq, cft->private, false);
 	return 0;
 }
 
-static int bfqg_print_rwstat(struct seq_file *sf, void *v)
+static int bfqg_print_rwstat(struct seq_file *sf, struct cftype *cft, void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat,
-			  &blkcg_policy_bfq, seq_cft(sf)->private, true);
+			  &blkcg_policy_bfq, cft->private, true);
 	return 0;
 }
 
@@ -949,19 +949,21 @@ static u64 bfqg_prfill_rwstat_recursive(struct seq_file *sf,
 	return __blkg_prfill_rwstat(sf, pd, &sum);
 }
 
-static int bfqg_print_stat_recursive(struct seq_file *sf, void *v)
+static int bfqg_print_stat_recursive(struct seq_file *sf, struct cftype *cft,
+				     void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
 			  bfqg_prfill_stat_recursive, &blkcg_policy_bfq,
-			  seq_cft(sf)->private, false);
+			  cft->private, false);
 	return 0;
 }
 
-static int bfqg_print_rwstat_recursive(struct seq_file *sf, void *v)
+static int bfqg_print_rwstat_recursive(struct seq_file *sf, struct cftype *cft,
+				       void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
 			  bfqg_prfill_rwstat_recursive, &blkcg_policy_bfq,
-			  seq_cft(sf)->private, true);
+			  cft->private, true);
 	return 0;
 }
 
@@ -1063,18 +1065,18 @@ struct cftype bfq_blkcg_legacy_files[] = {
 	{
 		.name = "bfq.io_service_bytes",
 		.private = (unsigned long)&blkcg_policy_bfq,
-		.seq_show = blkg_print_stat_bytes,
+		.seq_show_cft = blkg_print_stat_bytes,
 	},
 	{
 		.name = "bfq.io_serviced",
 		.private = (unsigned long)&blkcg_policy_bfq,
-		.seq_show = blkg_print_stat_ios,
+		.seq_show_cft = blkg_print_stat_ios,
 	},
 #ifdef CONFIG_DEBUG_BLK_CGROUP
 	{
 		.name = "bfq.time",
 		.private = offsetof(struct bfq_group, stats.time),
-		.seq_show = bfqg_print_stat,
+		.seq_show_cft = bfqg_print_stat,
 	},
 	{
 		.name = "bfq.sectors",
@@ -1083,22 +1085,22 @@ struct cftype bfq_blkcg_legacy_files[] = {
 	{
 		.name = "bfq.io_service_time",
 		.private = offsetof(struct bfq_group, stats.service_time),
-		.seq_show = bfqg_print_rwstat,
+		.seq_show_cft = bfqg_print_rwstat,
 	},
 	{
 		.name = "bfq.io_wait_time",
 		.private = offsetof(struct bfq_group, stats.wait_time),
-		.seq_show = bfqg_print_rwstat,
+		.seq_show_cft = bfqg_print_rwstat,
 	},
 	{
 		.name = "bfq.io_merged",
 		.private = offsetof(struct bfq_group, stats.merged),
-		.seq_show = bfqg_print_rwstat,
+		.seq_show_cft = bfqg_print_rwstat,
 	},
 	{
 		.name = "bfq.io_queued",
 		.private = offsetof(struct bfq_group, stats.queued),
-		.seq_show = bfqg_print_rwstat,
+		.seq_show_cft = bfqg_print_rwstat,
 	},
 #endif /* CONFIG_DEBUG_BLK_CGROUP */
 
@@ -1106,18 +1108,18 @@ struct cftype bfq_blkcg_legacy_files[] = {
 	{
 		.name = "bfq.io_service_bytes_recursive",
 		.private = (unsigned long)&blkcg_policy_bfq,
-		.seq_show = blkg_print_stat_bytes_recursive,
+		.seq_show_cft = blkg_print_stat_bytes_recursive,
 	},
 	{
 		.name = "bfq.io_serviced_recursive",
 		.private = (unsigned long)&blkcg_policy_bfq,
-		.seq_show = blkg_print_stat_ios_recursive,
+		.seq_show_cft = blkg_print_stat_ios_recursive,
 	},
 #ifdef CONFIG_DEBUG_BLK_CGROUP
 	{
 		.name = "bfq.time_recursive",
 		.private = offsetof(struct bfq_group, stats.time),
-		.seq_show = bfqg_print_stat_recursive,
+		.seq_show_cft = bfqg_print_stat_recursive,
 	},
 	{
 		.name = "bfq.sectors_recursive",
@@ -1126,22 +1128,22 @@ struct cftype bfq_blkcg_legacy_files[] = {
 	{
 		.name = "bfq.io_service_time_recursive",
 		.private = offsetof(struct bfq_group, stats.service_time),
-		.seq_show = bfqg_print_rwstat_recursive,
+		.seq_show_cft = bfqg_print_rwstat_recursive,
 	},
 	{
 		.name = "bfq.io_wait_time_recursive",
 		.private = offsetof(struct bfq_group, stats.wait_time),
-		.seq_show = bfqg_print_rwstat_recursive,
+		.seq_show_cft = bfqg_print_rwstat_recursive,
 	},
 	{
 		.name = "bfq.io_merged_recursive",
 		.private = offsetof(struct bfq_group, stats.merged),
-		.seq_show = bfqg_print_rwstat_recursive,
+		.seq_show_cft = bfqg_print_rwstat_recursive,
 	},
 	{
 		.name = "bfq.io_queued_recursive",
 		.private = offsetof(struct bfq_group, stats.queued),
-		.seq_show = bfqg_print_rwstat_recursive,
+		.seq_show_cft = bfqg_print_rwstat_recursive,
 	},
 	{
 		.name = "bfq.avg_queue_size",
@@ -1150,22 +1152,22 @@ struct cftype bfq_blkcg_legacy_files[] = {
 	{
 		.name = "bfq.group_wait_time",
 		.private = offsetof(struct bfq_group, stats.group_wait_time),
-		.seq_show = bfqg_print_stat,
+		.seq_show_cft = bfqg_print_stat,
 	},
 	{
 		.name = "bfq.idle_time",
 		.private = offsetof(struct bfq_group, stats.idle_time),
-		.seq_show = bfqg_print_stat,
+		.seq_show_cft = bfqg_print_stat,
 	},
 	{
 		.name = "bfq.empty_time",
 		.private = offsetof(struct bfq_group, stats.empty_time),
-		.seq_show = bfqg_print_stat,
+		.seq_show_cft = bfqg_print_stat,
 	},
 	{
 		.name = "bfq.dequeue",
 		.private = offsetof(struct bfq_group, stats.dequeue),
-		.seq_show = bfqg_print_stat,
+		.seq_show_cft = bfqg_print_stat,
 	},
 #endif	/* CONFIG_DEBUG_BLK_CGROUP */
 	{ }	/* terminate */
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 63d226a084cd..772d32bbecae 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -565,15 +565,16 @@ static u64 blkg_prfill_rwstat_field(struct seq_file *sf,
 /**
  * blkg_print_stat_bytes - seq_show callback for blkg->stat_bytes
  * @sf: seq_file to print to
+ * @cft: cftype holding the data
  * @v: unused
  *
  * To be used as cftype->seq_show to print blkg->stat_bytes.
  * cftype->private must be set to the blkcg_policy.
  */
-int blkg_print_stat_bytes(struct seq_file *sf, void *v)
+int blkg_print_stat_bytes(struct seq_file *sf, struct cftype *cft, void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
-			  blkg_prfill_rwstat_field, (void *)seq_cft(sf)->private,
+			  blkg_prfill_rwstat_field, (void *)cft->private,
 			  offsetof(struct blkcg_gq, stat_bytes), true);
 	return 0;
 }
@@ -582,15 +583,16 @@ EXPORT_SYMBOL_GPL(blkg_print_stat_bytes);
 /**
  * blkg_print_stat_bytes - seq_show callback for blkg->stat_ios
  * @sf: seq_file to print to
+ * @cft: cftype holding the data
  * @v: unused
  *
  * To be used as cftype->seq_show to print blkg->stat_ios.  cftype->private
  * must be set to the blkcg_policy.
  */
-int blkg_print_stat_ios(struct seq_file *sf, void *v)
+int blkg_print_stat_ios(struct seq_file *sf, struct cftype *cft, void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
-			  blkg_prfill_rwstat_field, (void *)seq_cft(sf)->private,
+			  blkg_prfill_rwstat_field, (void *)cft->private,
 			  offsetof(struct blkcg_gq, stat_ios), true);
 	return 0;
 }
@@ -608,13 +610,15 @@ static u64 blkg_prfill_rwstat_field_recursive(struct seq_file *sf,
 /**
  * blkg_print_stat_bytes_recursive - recursive version of blkg_print_stat_bytes
  * @sf: seq_file to print to
+ * @cft: cftype holding the data
  * @v: unused
  */
-int blkg_print_stat_bytes_recursive(struct seq_file *sf, void *v)
+int blkg_print_stat_bytes_recursive(struct seq_file *sf, struct cftype *cft,
+				    void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
 			  blkg_prfill_rwstat_field_recursive,
-			  (void *)seq_cft(sf)->private,
+			  (void *)cft->private,
 			  offsetof(struct blkcg_gq, stat_bytes), true);
 	return 0;
 }
@@ -623,13 +627,15 @@ EXPORT_SYMBOL_GPL(blkg_print_stat_bytes_recursive);
 /**
  * blkg_print_stat_ios_recursive - recursive version of blkg_print_stat_ios
  * @sf: seq_file to print to
+ * @cft: cftype holding the data
  * @v: unused
  */
-int blkg_print_stat_ios_recursive(struct seq_file *sf, void *v)
+int blkg_print_stat_ios_recursive(struct seq_file *sf, struct cftype *cft,
+				  void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
 			  blkg_prfill_rwstat_field_recursive,
-			  (void *)seq_cft(sf)->private,
+			  (void *)cft->private,
 			  offsetof(struct blkcg_gq, stat_ios), true);
 	return 0;
 }
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 8f0a104770ee..6bfdaac53b6f 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1493,22 +1493,22 @@ static struct cftype throtl_legacy_files[] = {
 	{
 		.name = "throttle.io_service_bytes",
 		.private = (unsigned long)&blkcg_policy_throtl,
-		.seq_show = blkg_print_stat_bytes,
+		.seq_show_cft = blkg_print_stat_bytes,
 	},
 	{
 		.name = "throttle.io_service_bytes_recursive",
 		.private = (unsigned long)&blkcg_policy_throtl,
-		.seq_show = blkg_print_stat_bytes_recursive,
+		.seq_show_cft = blkg_print_stat_bytes_recursive,
 	},
 	{
 		.name = "throttle.io_serviced",
 		.private = (unsigned long)&blkcg_policy_throtl,
-		.seq_show = blkg_print_stat_ios,
+		.seq_show_cft = blkg_print_stat_ios,
 	},
 	{
 		.name = "throttle.io_serviced_recursive",
 		.private = (unsigned long)&blkcg_policy_throtl,
-		.seq_show = blkg_print_stat_ios_recursive,
+		.seq_show_cft = blkg_print_stat_ios_recursive,
 	},
 	{ }	/* terminate */
 };
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index a9e2e2037129..770b59e0d35f 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -207,10 +207,12 @@ u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
 u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, int off);
 u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
 		       int off);
-int blkg_print_stat_bytes(struct seq_file *sf, void *v);
-int blkg_print_stat_ios(struct seq_file *sf, void *v);
-int blkg_print_stat_bytes_recursive(struct seq_file *sf, void *v);
-int blkg_print_stat_ios_recursive(struct seq_file *sf, void *v);
+int blkg_print_stat_bytes(struct seq_file *sf, struct cftype *cft, void *v);
+int blkg_print_stat_ios(struct seq_file *sf, struct cftype *cft, void *v);
+int blkg_print_stat_bytes_recursive(struct seq_file *sf, struct cftype *cft,
+				    void *v);
+int blkg_print_stat_ios_recursive(struct seq_file *sf, struct cftype *cft,
+				  void *v);
 
 u64 blkg_stat_recursive_sum(struct blkcg_gq *blkg,
 			    struct blkcg_policy *pol, int off);
-- 
2.16.1


  parent reply	other threads:[~2018-11-19 10:34 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-19 10:34 [PATCH V2 00/10] unify the interface of the proportional-share policy in blkio/io Paolo Valente
2018-11-19 10:34 ` [PATCH V2 01/10] cgroup: add hook seq_show_cft with also the owning cftype as parameter Paolo Valente
2018-11-19 10:34 ` Paolo Valente [this message]
2018-11-19 10:34 ` [PATCH V2 03/10] cgroup: link cftypes of the same subsystem with the same name Paolo Valente
2018-11-19 10:34 ` [PATCH V2 04/10] cgroup: add owner name to cftypes Paolo Valente
2018-11-19 10:34 ` [PATCH V2 05/10] block, bfq: align min and default weights with the old cfq default Paolo Valente
2018-11-19 10:34 ` [PATCH V2 06/10] cgroup: make all functions of all cftypes be invoked Paolo Valente
2018-11-19 10:34 ` [PATCH V2 07/10] block, bfq: use standard file names for the proportional-share policy Paolo Valente
2018-11-19 10:34 ` [PATCH V2 08/10] block, throttle: allow sharing cgroup statistic files Paolo Valente
2018-11-19 10:34 ` [PATCH V2 09/10] doc, bfq-iosched: fix a few clerical errors Paolo Valente
2018-11-19 10:34 ` [PATCH V2 10/10] doc, bfq-iosched: make it consistent with the new cgroup interface Paolo Valente
2018-11-20 16:28 ` [PATCH V2 00/10] unify the interface of the proportional-share policy in blkio/io Tejun Heo
2018-11-20 16:50   ` Paolo Valente
2018-11-30 18:23     ` Paolo Valente
2018-11-30 18:42       ` Tejun Heo
2018-11-30 18:53         ` Paolo Valente
2018-12-10 13:45           ` Angelo Ruocco
2018-12-18  7:48             ` Paolo Valente
2018-12-18 16:41               ` Tejun Heo
2018-12-18 17:22                 ` Paolo Valente
2018-12-18 18:05                   ` Paolo Valente
2018-12-23 11:00                   ` Paolo Valente
2018-12-27 23:41                     ` Tejun Heo
2018-12-30 10:25                       ` Paolo Valente
2019-01-02 16:03                         ` Tejun Heo
2019-01-02 16:28                           ` Paolo Valente

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