[PATCH v3 10/10] fs/xfs: Add dedupe support for fsdax

Shiyang Ruan
2021-03-19T01:54:33Z

Add xfs_break_two_dax_layouts() to break layout for tow dax files. Then
call compare range function only when files are both DAX or not.

Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
---
fs/xfs/xfs_file.c | 20 ++++++++++++++++++++
fs/xfs/xfs_inode.c | 8 +++++++-
fs/xfs/xfs_inode.h | 1 +
fs/xfs/xfs_reflink.c | 5 +++--
4 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 1987d15eab61..82467d08e3ce 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -784,6 +784,26 @@ xfs_break_dax_layouts(
0, 0, xfs_wait_dax_page(inode));
}

+int
+xfs_break_two_dax_layouts(
+ struct inode *src,
+ struct inode *dest)
+{
+ int error;
+ bool retry = false;
+
+retry:
+ error = xfs_break_dax_layouts(src, &retry);
+ if (error || retry)
+ goto retry;
+
+ error = xfs_break_dax_layouts(dest, &retry);
+ if (error || retry)
+ goto retry;
+
+ return error;
+}
+
int
xfs_break_layouts(
struct inode *inode,
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index b7352bc4c815..c11b11e59a83 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3651,8 +3651,10 @@ xfs_ilock2_io_mmap(
struct xfs_inode *ip2)
{
int ret;
+ struct inode *inode1 = VFS_I(ip1);
+ struct inode *inode2 = VFS_I(ip2);

- ret = xfs_iolock_two_inodes_and_break_layout(VFS_I(ip1), VFS_I(ip2));
+ ret = xfs_iolock_two_inodes_and_break_layout(inode1, inode2);
if (ret)
return ret;
if (ip1 == ip2)
@@ -3660,6 +3662,10 @@ xfs_ilock2_io_mmap(
else
xfs_lock_two_inodes(ip1, XFS_MMAPLOCK_EXCL,
ip2, XFS_MMAPLOCK_EXCL);
+
+ if (IS_DAX(inode1) && IS_DAX(inode2))
+ ret = xfs_break_two_dax_layouts(inode1, inode2);
+
return 0;
}

diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index eca333f5f715..9ed7a2895602 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -431,6 +431,7 @@ enum xfs_prealloc_flags {

int xfs_update_prealloc_flags(struct xfs_inode *ip,
enum xfs_prealloc_flags flags);
+int xfs_break_two_dax_layouts(struct inode *inode1, struct inode *inode2);
int xfs_break_layouts(struct inode *inode, uint *iolock,
enum layout_break_reason reason);

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 73c556c2ff76..e62b00c2a0c8 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -29,6 +29,7 @@
#include "xfs_iomap.h"
#include "xfs_sb.h"
#include "xfs_ag_resv.h"
+#include <linux/dax.h>

/*
* Copy on Write of Shared Blocks
@@ -1303,8 +1304,8 @@ xfs_reflink_remap_prep(
if (XFS_IS_REALTIME_INODE(src) || XFS_IS_REALTIME_INODE(dest))
goto out_unlock;

- /* Don't share DAX file data for now. */
- if (IS_DAX(inode_in) || IS_DAX(inode_out))
+ /* Don't share DAX file data with non-DAX file. */
+ if (IS_DAX(inode_in) != IS_DAX(inode_out))
goto out_unlock;

if (IS_DAX(inode_in))
--
2.30.1