From: Marcos Paulo de Souza <mpdesouza@xxxxxxxx>
This new function will be used to send uevents when a subvolume is created
or removed. Two environment variables are being exported:
BTRFS_VOL_NAME: contains the name of the volume being added/removed
BTRFS_VOL_{ADD|DEL}: will signalize whether a subvolume is created/deleted
Signed-off-by: Marcos Paulo de Souza <mpdesouza@xxxxxxxx>
---
fs/btrfs/ioctl.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index de730e56d3f5..174cbe71d6be 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -940,6 +940,33 @@ static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
return inode_permission(dir, MAY_WRITE | MAY_EXEC);
}
+static inline int btrfs_vol_uevent(struct block_device *bdev, bool vol_added,
+ const char *name)
+{
+ char *envp[3];
+ int ret = -ENOMEM;
+
+ envp[0] = kasprintf(GFP_KERNEL, "BTRFS_VOL_NAME=%s", name);
+ if (!envp[0])
+ return ret;
+
+ envp[1] = kasprintf(GFP_KERNEL, "BTRFS_VOL_%s=1",
+ vol_added ? "NEW" : "DEL");
+ if (!envp[1])
+ goto free;
+
+ envp[2] = NULL;
+
+ btrfs_kobject_uevent(bdev, KOBJ_CHANGE, envp);
+
+ ret = 0;
+
+ kfree(envp[1]);
+free:
+ kfree(envp[0]);
+ return ret;
+}
+
/*
* Create a new subvolume below @parent. This is largely modeled after
* sys_mkdirat and vfs_mkdir, but we only do a single component lookup
--
2.23.0
