Drivers: hv: Make the sysfs node size for the ring buffer dynamic

commit 65995e9 upstream.

The ring buffer size varies across VMBus channels. The size of sysfs
node for the ring buffer is currently hardcoded to 4 MB. Userspace
clients either use fstat() or hardcode this size for doing mmap().
To address this, make the sysfs node size dynamic to reflect the
actual ring buffer size for each channel. This will ensure that
fstat() on ring sysfs node always returns the correct size of
ring buffer.

Reviewed-by: Michael Kelley <[email protected]>
Tested-by: Michael Kelley <[email protected]>
Reviewed-by: Dexuan Cui <[email protected]>
Signed-off-by: Naman Jain <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ The structure "struct attribute_group" does not have bin_size field in
  v6.12.x kernel so the logic of configuring size of sysfs node for ring buffer
  has been moved to vmbus_chan_bin_attr_is_visible().
  Original change was not a fix, but it needs to be backported to fix size
  related discrepancy caused by the commit mentioned in Fixes tag. ]
Signed-off-by: Naman Jain <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Naman Jain

drivers/hv/vmbus_drv.c

@@ -1810,7 +1810,6 @@ static struct bin_attribute chan_attr_ring_buffer = {
 		.name = "ring",
 		.mode = 0600,
 	},
-	.size = 2 * SZ_2M,
 	.mmap = hv_mmap_ring_buffer_wrapper,
 };
 static struct attribute *vmbus_chan_attrs[] = {
@@ -1866,6 +1865,7 @@ static umode_t vmbus_chan_bin_attr_is_visible(struct kobject *kobj,
 	/* Hide ring attribute if channel's ring_sysfs_visible is set to false */
 	if (attr ==  &chan_attr_ring_buffer && !channel->ring_sysfs_visible)
 		return 0;
+	attr->size = channel->ringbuffer_pagecount << PAGE_SHIFT;
 
 	return attr->attr.mode;
 }