[23/25] ocfs2: support partial clone range and dedupe range

Commit Message

Darrick J. Wong Oct. 10, 2018, 12:14 a.m. UTC

From: Darrick J. Wong <[e-mail]>

Change the ocfs2 remap code to allow for returning partial results.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 fs/ocfs2/file.c         |    7 +----
 fs/ocfs2/refcounttree.c |   73 ++++++++++++++++++++++++++---------------------
 fs/ocfs2/refcounttree.h |   12 ++++----
 3 files changed, 48 insertions(+), 44 deletions(-)

Patch

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index c018605ac279..f9e65ff89a8a 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2531,11 +2531,8 @@  static loff_t ocfs2_remap_file_range(struct file *file_in, loff_t pos_in,
 				     struct file *file_out, loff_t pos_out,
 				     loff_t len, unsigned int flags)
 {
-	int ret;
-
-	ret = ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
-					len, flags);
-	return ret < 0 ? ret : len;
+	return ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
+			len, flags);
 }
 
 const struct inode_operations ocfs2_file_iops = {
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index b9e0418a1974..4eacdd703874 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -4507,14 +4507,14 @@  static int ocfs2_reflink_update_dest(struct inode *dest,
 }
 
 /* Remap the range pos_in:len in s_inode to pos_out:len in t_inode. */
-static int ocfs2_reflink_remap_extent(struct inode *s_inode,
-				      struct buffer_head *s_bh,
-				      loff_t pos_in,
-				      struct inode *t_inode,
-				      struct buffer_head *t_bh,
-				      loff_t pos_out,
-				      loff_t len,
-				      struct ocfs2_cached_dealloc_ctxt *dealloc)
+static loff_t ocfs2_reflink_remap_extent(struct inode *s_inode,
+					 struct buffer_head *s_bh,
+					 loff_t pos_in,
+					 struct inode *t_inode,
+					 struct buffer_head *t_bh,
+					 loff_t pos_out,
+					 loff_t len,
+					 struct ocfs2_cached_dealloc_ctxt *dealloc)
 {
 	struct ocfs2_extent_tree s_et;
 	struct ocfs2_extent_tree t_et;
@@ -4522,6 +4522,7 @@  static int ocfs2_reflink_remap_extent(struct inode *s_inode,
 	struct buffer_head *ref_root_bh = NULL;
 	struct ocfs2_refcount_tree *ref_tree;
 	struct ocfs2_super *osb;
+	loff_t remapped = 0;
 	loff_t pstart, plen;
 	u32 p_cluster, num_clusters, slast, spos, tpos;
 	unsigned int ext_flags;
@@ -4605,30 +4606,32 @@  static int ocfs2_reflink_remap_extent(struct inode *s_inode,
 next_loop:
 		spos += num_clusters;
 		tpos += num_clusters;
+		remapped += ocfs2_clusters_to_bytes(t_inode->i_sb,
+				num_clusters);
 	}
 
-out:
-	return ret;
+	return remapped;
 out_unlock_refcount:
 	ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
 	brelse(ref_root_bh);
-	return ret;
+out:
+	return remapped > 0 ? remapped : ret;
 }
 
 /* Set up refcount tree and remap s_inode to t_inode. */
-static int ocfs2_reflink_remap_blocks(struct inode *s_inode,
-				      struct buffer_head *s_bh,
-				      loff_t pos_in,
-				      struct inode *t_inode,
-				      struct buffer_head *t_bh,
-				      loff_t pos_out,
-				      loff_t len)
+static loff_t ocfs2_reflink_remap_blocks(struct inode *s_inode,
+					 struct buffer_head *s_bh,
+					 loff_t pos_in,
+					 struct inode *t_inode,
+					 struct buffer_head *t_bh,
+					 loff_t pos_out,
+					 loff_t len)
 {
 	struct ocfs2_cached_dealloc_ctxt dealloc;
 	struct ocfs2_super *osb;
 	struct ocfs2_dinode *dis;
 	struct ocfs2_dinode *dit;
-	int ret;
+	loff_t ret;
 
 	osb = OCFS2_SB(s_inode->i_sb);
 	dis = (struct ocfs2_dinode *)s_bh->b_data;
@@ -4700,7 +4703,7 @@  static int ocfs2_reflink_remap_blocks(struct inode *s_inode,
 	/* Actually remap extents now. */
 	ret = ocfs2_reflink_remap_extent(s_inode, s_bh, pos_in, t_inode, t_bh,
 					 pos_out, len, &dealloc);
-	if (ret) {
+	if (ret < 0) {
 		mlog_errno(ret);
 		goto out;
 	}
@@ -4820,18 +4823,19 @@  static void ocfs2_reflink_inodes_unlock(struct inode *s_inode,
 }
 
 /* Link a range of blocks from one file to another. */
-int ocfs2_reflink_remap_range(struct file *file_in,
-			      loff_t pos_in,
-			      struct file *file_out,
-			      loff_t pos_out,
-			      loff_t len,
-			      unsigned int remap_flags)
+loff_t ocfs2_reflink_remap_range(struct file *file_in,
+				 loff_t pos_in,
+				 struct file *file_out,
+				 loff_t pos_out,
+				 loff_t len,
+				 unsigned int remap_flags)
 {
 	struct inode *inode_in = file_inode(file_in);
 	struct inode *inode_out = file_inode(file_out);
 	struct ocfs2_super *osb = OCFS2_SB(inode_in->i_sb);
 	struct buffer_head *in_bh = NULL, *out_bh = NULL;
 	bool same_inode = (inode_in == inode_out);
+	loff_t remapped = 0;
 	ssize_t ret;
 
 	if (!ocfs2_refcount_tree(osb))
@@ -4855,6 +4859,11 @@  int ocfs2_reflink_remap_range(struct file *file_in,
 	if (ret <= 0)
 		goto out_unlock;
 
+	if (len == 0) {
+		ret = 0;
+		goto out_unlock;
+	}
+
 	/*
 	 * Update inode timestamps and remove security privileges before we
 	 * take the ilock.
@@ -4874,12 +4883,13 @@  int ocfs2_reflink_remap_range(struct file *file_in,
 				   round_down(pos_out, PAGE_SIZE),
 				   round_up(pos_out + len, PAGE_SIZE) - 1);
 
-	ret = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in, inode_out,
-					 out_bh, pos_out, len);
+	remapped = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in,
+			inode_out, out_bh, pos_out, len);
 	up_write(&OCFS2_I(inode_in)->ip_alloc_sem);
 	if (!same_inode)
 		up_write(&OCFS2_I(inode_out)->ip_alloc_sem);
-	if (ret) {
+	if (remapped < 0) {
+		ret = remapped;
 		mlog_errno(ret);
 		goto out_unlock;
 	}
@@ -4897,10 +4907,7 @@  int ocfs2_reflink_remap_range(struct file *file_in,
 		goto out_unlock;
 	}
 
-	ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
-	return 0;
-
 out_unlock:
 	ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
-	return ret;
+	return remapped > 0 ? remapped : ret;
 }
diff --git a/fs/ocfs2/refcounttree.h b/fs/ocfs2/refcounttree.h
index eb65c1d0843c..9e64daba395d 100644
--- a/fs/ocfs2/refcounttree.h
+++ b/fs/ocfs2/refcounttree.h
@@ -115,11 +115,11 @@  int ocfs2_reflink_ioctl(struct inode *inode,
 			const char __user *oldname,
 			const char __user *newname,
 			bool preserve);
-int ocfs2_reflink_remap_range(struct file *file_in,
-			      loff_t pos_in,
-			      struct file *file_out,
-			      loff_t pos_out,
-			      loff_t len,
-			      unsigned int remap_flags);
+loff_t ocfs2_reflink_remap_range(struct file *file_in,
+				 loff_t pos_in,
+				 struct file *file_out,
+				 loff_t pos_out,
+				 loff_t len,
+				 unsigned int remap_flags);
 
 #endif /* OCFS2_REFCOUNTTREE_H */