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[PATCH v2 06/17] fs/block_dev.c: skip rw_page if bdev has integrity

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From: Vishal Verma <vishal.l.verma@intel.com>

If a block device has bio integrity enabled, rw_page will bypass the
integrity payload, which is undesirable. Skip rw_page if this is the
case.

Currently brd and zram provide rw_page, and the proposed 'nd' drivers
will too.

Cc: Jens Axboe <axboe@fb.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Suggested-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 fs/block_dev.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index c7e4163ede87..054ef1bbb821 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -376,7 +376,7 @@ int bdev_read_page(struct block_device *bdev, sector_t sector,
 			struct page *page)
 {
 	const struct block_device_operations *ops = bdev->bd_disk->fops;
-	if (!ops->rw_page)
+	if (!ops->rw_page || bdev_get_integrity(bdev))
 		return -EOPNOTSUPP;
 	return ops->rw_page(bdev, sector + get_start_sect(bdev), page, READ);
 }
@@ -407,7 +407,7 @@ int bdev_write_page(struct block_device *bdev, sector_t sector,
 	int result;
 	int rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE;
 	const struct block_device_operations *ops = bdev->bd_disk->fops;
-	if (!ops->rw_page)
+	if (!ops->rw_page || bdev_get_integrity(bdev))
 		return -EOPNOTSUPP;
 	set_page_writeback(page);
 	result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, rw);

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[PATCH v2 00/17] libnvdimm: ->rw_bytes(), BLK, BTT, PMEM api,  and unit tests Dan Williams <dan.j.williams@intel.com> - 2015-06-25 11:50 +0200
  [PATCH v2 16/17] libnvdimm: Add sysfs numa_node to NVDIMM devices Dan Williams <dan.j.williams@intel.com> - 2015-06-25 11:50 +0200
    Re: [PATCH v2 16/17] libnvdimm: Add sysfs numa_node to NVDIMM  devices Toshi Kani <toshi.kani@hp.com> - 2015-06-26 04:30 +0200
  [PATCH v2 06/17] fs/block_dev.c: skip rw_page if bdev has integrity Dan Williams <dan.j.williams@intel.com> - 2015-06-25 11:50 +0200
  [PATCH v2 14/17] acpi: Add acpi_map_pxm_to_online_node() Dan Williams <dan.j.williams@intel.com> - 2015-06-25 11:50 +0200
  [PATCH v2 12/17] pmem: flag pmem block devices as non-rotational Dan Williams <dan.j.williams@intel.com> - 2015-06-25 11:50 +0200
  [PATCH v2 11/17] libnvdimm: enable iostat Dan Williams <dan.j.williams@intel.com> - 2015-06-25 11:50 +0200

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