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From: Muneendra <muneendra.kumar@broadcom.com>
To: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
	tj@kernel.org, linux-nvme@lists.infradead.org, hare@suse.de
Cc: jsmart2021@gmail.com, emilne@redhat.com, mkumar@redhat.com,
	Muneendra <muneendra.kumar@broadcom.com>
Subject: [PATCH v9 01/13] cgroup: Added cgroup_get_from_id
Date: Wed,  7 Apr 2021 04:36:25 +0530
Message-ID: <1617750397-26466-2-git-send-email-muneendra.kumar@broadcom.com> (raw)
In-Reply-To: <1617750397-26466-1-git-send-email-muneendra.kumar@broadcom.com>

Added a new function cgroup_get_from_id  to retrieve the cgroup
associated with cgroup id.
Exported the same as this can be used by blk-cgorup.c

Added function declaration of cgroup_get_from_id in cgorup.h

This patch also exported the function cgroup_get_e_css
as this is getting used in blk-cgroup.h

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Muneendra <muneendra.kumar@broadcom.com>

---
v9:
Addressed the issues reported by kernel test robot

v8:
No change

v7:
No change

v6:
No change

v5:
renamed the function cgroup_get_from_kernfs_id to
cgroup_get_from_id

v4:
No change

v3:
Exported the cgroup_get_e_css

v2:
New patch
---
 include/linux/cgroup.h |  6 ++++++
 kernel/cgroup/cgroup.c | 26 ++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 4f2f79de083e..d2eace88d9d1 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -696,6 +696,7 @@ static inline void cgroup_kthread_ready(void)
 }
 
 void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen);
+struct cgroup *cgroup_get_from_id(u64 id);
 #else /* !CONFIG_CGROUPS */
 
 struct cgroup_subsys_state;
@@ -743,6 +744,11 @@ static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
 
 static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
 {}
+
+static inline struct cgroup *cgroup_get_from_id(u64 id)
+{
+	return NULL;
+}
 #endif /* !CONFIG_CGROUPS */
 
 #ifdef CONFIG_CGROUPS
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 9153b20e5cc6..20e5424a8227 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -577,6 +577,7 @@ struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgrp,
 	rcu_read_unlock();
 	return css;
 }
+EXPORT_SYMBOL_GPL(cgroup_get_e_css);
 
 static void cgroup_get_live(struct cgroup *cgrp)
 {
@@ -5768,6 +5769,31 @@ void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
 	kernfs_put(kn);
 }
 
+/*
+ * cgroup_get_from_id : get the cgroup associated with cgroup id
+ * @id: cgroup id
+ * On success it returns the cgrp on failure it returns NULL
+ */
+struct cgroup *cgroup_get_from_id(u64 id)
+{
+	struct kernfs_node *kn;
+	struct cgroup *cgrp = NULL;
+
+	mutex_lock(&cgroup_mutex);
+	kn = kernfs_find_and_get_node_by_id(cgrp_dfl_root.kf_root, id);
+	if (!kn)
+		goto out_unlock;
+
+	cgrp = kn->priv;
+	if (cgroup_is_dead(cgrp) || !cgroup_tryget(cgrp))
+		cgrp = NULL;
+	kernfs_put(kn);
+out_unlock:
+	mutex_unlock(&cgroup_mutex);
+	return cgrp;
+}
+EXPORT_SYMBOL_GPL(cgroup_get_from_id);
+
 /*
  * proc_cgroup_show()
  *  - Print task's cgroup paths into seq_file, one line for each hierarchy
-- 
2.26.2


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Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-06 23:06 [PATCH v9 00/13] blkcg:Support to track FC storage blk io traffic Muneendra
2021-04-06 23:06 ` Muneendra [this message]
2021-04-08  8:26   ` [PATCH v9 01/13] cgroup: Added cgroup_get_from_id Hannes Reinecke
2021-04-06 23:06 ` [PATCH v9 02/13] blkcg: Added a app identifier support for blkcg Muneendra
2021-04-08  8:26   ` Hannes Reinecke
2021-04-06 23:06 ` [PATCH v9 03/13] nvme: Added a newsysfs attribute appid_store Muneendra
2021-04-18 15:32   ` Benjamin Block
2021-04-20  6:54     ` Muneendra Kumar M
2021-04-20 11:09       ` Benjamin Block
2021-04-22 23:29         ` James Smart
2021-04-23 10:14           ` Benjamin Block
2021-04-06 23:06 ` [PATCH v9 04/13] lpfc: vmid: Add the datastructure for supporting VMID in lpfc Muneendra
2021-04-08  8:28   ` Hannes Reinecke
2021-04-06 23:06 ` [PATCH v9 05/13] lpfc: vmid: VMID params initialization Muneendra
2021-04-08  8:29   ` Hannes Reinecke
2021-04-06 23:06 ` [PATCH v9 06/13] lpfc: vmid: Add support for vmid in mailbox command, does vmid resource allocation and vmid cleanup Muneendra
2021-04-08  8:32   ` Hannes Reinecke
2021-04-06 23:06 ` [PATCH v9 07/13] lpfc: vmid: Implements ELS commands for appid patch Muneendra
2021-04-08  8:34   ` Hannes Reinecke
2021-04-20 12:38   ` Benjamin Block
2021-04-21 22:55     ` James Smart
2021-04-22  9:28       ` Benjamin Block
2021-04-06 23:06 ` [PATCH v9 08/13] lpfc: vmid: Functions to manage vmids Muneendra
2021-04-08  8:35   ` Hannes Reinecke
2021-04-06 23:06 ` [PATCH v9 09/13] lpfc: vmid: Implements CT commands for appid Muneendra
2021-04-08  8:37   ` Hannes Reinecke
2021-04-06 23:06 ` [PATCH v9 10/13] lpfc: vmid: Appends the vmid in the wqe before sending Muneendra
2021-04-06 23:06 ` [PATCH v9 11/13] lpfc: vmid: Timeout implementation for vmid Muneendra
2021-04-08  8:38   ` Hannes Reinecke
2021-04-06 23:06 ` [PATCH v9 12/13] lpfc: vmid: Adding qfpa and vmid timeout check in worker thread Muneendra
2021-04-06 23:06 ` [PATCH v9 13/13] lpfc: vmid: Introducing vmid in io path Muneendra
2021-04-08  8:46   ` Hannes Reinecke
2021-04-10 15:00     ` James Smart
2021-04-12  5:27       ` Hannes Reinecke

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