xfs_write_lock

xfs_write_with_lock.c

xfs_file_buffered_aio_write(
       struct kiocb            *iocb,
       struct iov_iter         *from)
{
...
       int                     iolock = XFS_IOLOCK_EXCL;
...
       xfs_rw_ilock(ip, iolock);
...
       ret = generic_perform_write(file, from, pos);
...
       xfs_rw_iunlock(ip, iolock);
       return ret;
}