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Commit 5a14e91d authored by Jeff Moyer's avatar Jeff Moyer Committed by Dan Williams
Browse files

dev-dax: check_vma: ratelimit dev_info-s 



This is easily triggered from userspace, so let's ratelimit the
messages.

Signed-off-by: default avatarJeff Moyer <jmoyer@redhat.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent b62cc6fd

drivers/dax/device.c

+8 −4
Original line number Diff line number Diff line
@@ -189,14 +189,16 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, 


	/* prevent private mappings from being established */

	if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {

		dev_info(dev, "%s: %s: fail, attempted private mapping\n",

		dev_info_ratelimited(dev,

				"%s: %s: fail, attempted private mapping\n",

				current->comm, func);

		return -EINVAL;

	}



	mask = dax_region->align - 1;

	if (vma->vm_start & mask || vma->vm_end & mask) {

		dev_info(dev, "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",

		dev_info_ratelimited(dev,

				"%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",

				current->comm, func, vma->vm_start, vma->vm_end,

				mask);

		return -EINVAL;
@@ -204,13 +206,15 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, 


	if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV

			&& (vma->vm_flags & VM_DONTCOPY) == 0) {

		dev_info(dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n",

		dev_info_ratelimited(dev,

				"%s: %s: fail, dax range requires MADV_DONTFORK\n",

				current->comm, func);

		return -EINVAL;

	}



	if (!vma_is_dax(vma)) {

		dev_info(dev, "%s: %s: fail, vma is not DAX capable\n",

		dev_info_ratelimited(dev,

				"%s: %s: fail, vma is not DAX capable\n",

				current->comm, func);

		return -EINVAL;

	}