Step to reproduce: # mkfs.btrfs <disk> # mount -o user_subvol_rm_allowed <disk> <mnt> # mkdir <mnt>/dir0 # chmod 777 <mnt>/dir0 # btrfs sub snap <mnt> <mnt>/dir0/snap0 # su -c "btrfs sub del <mnt>/dir0/snap0" -s /bin/bash nobody ERROR: cannot delete '<mnt>/dir0/snap0' - Permission denied This is because we checked the permission of the subvolume that we want to delete, and found the user - nobody have no WRITE permission of this subvolume. I think we need not check the permission of the subvolume we want to delete, because we have the right to clean up the directory since we have WRITE and EXECUTE permission, just like rmdir command. Signed-off-by: Miao Xie <miaox@xxxxxxxxxxxxxx> --- fs/btrfs/ioctl.c | 4 ---- 1 files changed, 0 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index f5a2e6c..29fb07c 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2062,10 +2062,6 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, if (root == dest) goto out_dput; - err = inode_permission(inode, MAY_WRITE | MAY_EXEC); - if (err) - goto out_dput; - /* check if subvolume may be deleted by a non-root user */ err = btrfs_may_delete(dir, dentry, 1); if (err) -- 1.7.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
