On Fri, Oct 07, 2016 at 03:09:00PM -0600, Ross Zwisler wrote:

Currently iomap_end() doesn't do anything for DAX page faults for both ext2
and XFS.  ext2_iomap_end() just checks for a write underrun, and
xfs_file_iomap_end() checks to see if it needs to finish a delayed
allocation.  However, in the future iomap_end() calls might be needed to
make sure we have balanced allocations, locks, etc.  So, add calls to
iomap_end() with appropriate error handling to dax_iomap_fault().

Is there a way to just have a single call to iomap_end at the end of
the function, after which we just return a previosuly setup return
value?

e.g.

out:
	if (ops->iomap_end) {
		error = ops->iomap_end(inode, pos, PAGE_SIZE,
				PAGE_SIZE, flags, &iomap);
	}

	if (error == -ENOMEM)
		return VM_FAULT_OOM | major;
	if (error < 0 && error != -EBUSY)
		return VM_FAULT_SIGBUS | major;
	return ret;

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