With address_space_operations missing for device dax, namely the
.set_page_dirty, we hit a kernel warning when running destructive
ndctl unit test: make TESTS=device-dax check
WARNING: CPU: 3 PID: 7380 at fs/buffer.c:581 __set_page_dirty+0xb1/0xc0
Setting address_space_operations to noop_set_page_dirty and
noop_invalidatepage for device dax to prevent fallback to
__set_page_dirty_buffers() and block_invalidatepage() respectively.
Fixes: 2232c6382a ("device-dax: Enable page_mapping()")
Reported-by: Vishal Verma <vishal.l.ve...@intel.com>
Suggested-by: Dan Williams <dan.j.willi...@intel.com>
Signed-off-by: Dave Jiang <dave.ji...@intel.com>
---
drivers/dax/device.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 6fd46083e629..079f6811eca6 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -534,6 +534,11 @@ static unsigned long dax_get_unmapped_area(struct file
*filp,
return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
}
+static const struct address_space_operations dev_dax_aops = {
+ .set_page_dirty = noop_set_page_dirty,
+ .invalidatepage = noop_invalidatepage,
+};
+
static int dax_open(struct inode *inode, struct file *filp)
{
struct dax_device *dax_dev = inode_dax(inode);
@@ -543,6 +548,7 @@ static int dax_open(struct inode *inode, struct file *filp)
dev_dbg(&dev_dax->dev, "trace\n");
inode->i_mapping = __dax_inode->i_mapping;
inode->i_mapping->host = __dax_inode;
+ inode->i_mapping->a_ops = &dev_dax_aops;
filp->f_mapping = inode->i_mapping;
filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
filp->private_data = dev_dax;
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