[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <1454009704-25959-1-git-send-email-ross.zwisler@linux.intel.com>
Date: Thu, 28 Jan 2016 12:35:03 -0700
From: Ross Zwisler <ross.zwisler@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
Dan Williams <dan.j.williams@...el.com>,
Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.com>,
Matthew Wilcox <willy@...ux.intel.com>,
linux-fsdevel@...r.kernel.org, linux-nvdimm@...ts.01.org
Subject: [PATCH 1/2] block: fix pfn_mkwrite() DAX fault handler
Previously the pfn_mkwrite() fault handler for raw block devices called
bldev_dax_fault() -> __dax_fault() to do a full DAX page fault. Really
what the pfn_mkwrite() fault handler needs to do is call dax_pfn_mkwrite()
to make sure that the radix tree entry for the given PTE is marked as dirty
so that a follow-up fsync or msync call will flush it durably to media.
Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
Fixes: 5a023cdba50c ("block: enable dax for raw block devices")
---
fs/block_dev.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7b9cd49..fa0507a 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1730,6 +1730,12 @@ static int blkdev_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
return __dax_fault(vma, vmf, blkdev_get_block, NULL);
}
+static int blkdev_dax_pfn_mkwrite(struct vm_area_struct *vma,
+ struct vm_fault *vmf)
+{
+ return dax_pfn_mkwrite(vma, vmf);
+}
+
static int blkdev_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
pmd_t *pmd, unsigned int flags)
{
@@ -1761,7 +1767,7 @@ static const struct vm_operations_struct blkdev_dax_vm_ops = {
.close = blkdev_vm_close,
.fault = blkdev_dax_fault,
.pmd_fault = blkdev_dax_pmd_fault,
- .pfn_mkwrite = blkdev_dax_fault,
+ .pfn_mkwrite = blkdev_dax_pfn_mkwrite,
};
static const struct vm_operations_struct blkdev_default_vm_ops = {
--
2.5.0
Powered by blists - more mailing lists