From: Marcos Paulo de Souza <mpdesouza@xxxxxxxx>
btrfs_vol_uevent will export two environment variables to udev:
BTRFS_VOL_NAME: containing the name of the volume being created
BTRFS_VOL_ADD: will signalize that a subvol was created
One can create a udev rule and check for BTRFS_VOL_ADD being sent,
these values one could detect whenever a subvolume is created, and
take any action based on the subvolume name contained in BTRFS_VOL_NAME.
Signed-off-by: Marcos Paulo de Souza <mpdesouza@xxxxxxxx>
---
fs/btrfs/ioctl.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 174cbe71d6be..c538d3648195 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -980,6 +980,7 @@ static noinline int btrfs_mksubvol(const struct path *parent,
{
struct inode *dir = d_inode(parent->dentry);
struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
+ struct block_device *bdev = fs_info->fs_devices->latest_bdev;
struct dentry *dentry;
int error;
@@ -1018,8 +1019,12 @@ static noinline int btrfs_mksubvol(const struct path *parent,
error = create_subvol(dir, dentry, name, namelen,
async_transid, inherit);
}
- if (!error)
+ if (!error) {
+ if (!snap_src)
+ btrfs_vol_uevent(bdev, true, name);
+
fsnotify_mkdir(dir, dentry);
+ }
out_up_read:
up_read(&fs_info->subvol_sem);
out_dput:
--
2.23.0
