Difference between BTRFS_IOC_SYNC and BTRFS_IOC_START_SYNC/BTRFS_IOC_WAIT_SYNC

[Aldo Davide]

Hi *,

I was playing with the BTRFS_IOC_* ioctls and I noticed that there are 3 
different ioctls related to syncing. So my question is, is the following

    ioctl(fd,BTRFS_IOC_SYNC);

equivalent to the following sequence:

    ioctl(fd,BTRFS_IOC_START_SYNC);
    ioctl(fd,BTRFS_IOC_WAIT_SYNC);

If not, what are their differences?

Thanks,
Aldo
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