[XFS] Explain the race closed by the addition of vn_iowait() to the start of xfs_itruncate_start().
[XFS] Explain the race closed by the addition of vn_iowait() to the start
of xfs_itruncate_start().

SGI-PV: 947420
SGI-Modid: xfs-linux-melb:xfs-kern:25527a

Signed-off-by: David Chinner <d2f98f0f27147ca85564d32aa37577d3673e6910@sgi.com>
Signed-off-by: Nathan Scott <e2e3f1f24cbc439f8c1ba9b08f9954237d64be64@sgi.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs