linux-kernel - [PATCH 1/5] btrfs: sysfs: Add envp argument to btrfs_kobject

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Message-Id: <20191024023636.21124-2-marcos.souza.org@gmail.com>
Date:   Wed, 23 Oct 2019 23:36:32 -0300
From:   Marcos Paulo de Souza <marcos.souza.org@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     clm@...com, josef@...icpanda.com, dsterba@...e.com,
        linux-btrfs@...r.kernel.org, mpdesouza@...e.com
Subject: [PATCH 1/5] btrfs: sysfs: Add envp argument to btrfs_kobject_uevent

From: Marcos Paulo de Souza <mpdesouza@...e.com>

This new argument will be used by the next patches for sending uevents
related to subvolumes being added/removed. These uevents will contain
environment data that will be sent to userspace, making it possible to
take actions once these events arrive.

Signed-off-by: Marcos Paulo de Souza <mpdesouza@...e.com>
---
 fs/btrfs/sysfs.c   | 7 +++++--
 fs/btrfs/sysfs.h   | 3 ++-
 fs/btrfs/volumes.c | 2 +-
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index f6d3c80f2e28..93a8ed9e4fe8 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -998,11 +998,14 @@ int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
 	return error;
 }
 
-void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
+void btrfs_kobject_uevent(struct block_device *bdev,
+				enum kobject_action action,
+				char *envp[])
 {
 	int ret;
 
-	ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
+	ret = kobject_uevent_env(&disk_to_dev(bdev->bd_disk)->kobj,
+				action, envp);
 	if (ret)
 		pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
 			action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h
index 610e9c36a94c..5be3953074ad 100644
--- a/fs/btrfs/sysfs.h
+++ b/fs/btrfs/sysfs.h
@@ -26,7 +26,8 @@ void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices,
 				    const u8 *fsid);
 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
 		u64 bit, enum btrfs_feature_set set);
-void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action);
+void btrfs_kobject_uevent(struct block_device *bdev,
+			enum kobject_action action, char *env[]);
 
 int __init btrfs_init_sysfs(void);
 void __cold btrfs_exit_sysfs(void);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index bdfe4493e43a..7a7a9cae9b80 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -7580,7 +7580,7 @@ void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_pat
 	}
 
 	/* Notify udev that device has changed */
-	btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
+	btrfs_kobject_uevent(bdev, KOBJ_CHANGE, NULL);
 
 	/* Update ctime/mtime for device path for libblkid */
 	update_dev_time(device_path);
-- 
2.23.0