[PATCH v3 17/26] xfs: remove parent pointers in unlink

[allison.henderson@oracle.com]

From: Allison Henderson <allison.henderson@oracle.com>

This patch removes the parent pointer attribute during unlink

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/libxfs/xfs_attr.c   |  2 +-
 fs/xfs/libxfs/xfs_attr.h   |  1 +
 fs/xfs/libxfs/xfs_parent.c | 17 +++++++++++++++++
 fs/xfs/libxfs/xfs_parent.h |  4 ++++
 fs/xfs/xfs_inode.c         | 29 +++++++++++++++++++++++------
 5 files changed, 46 insertions(+), 7 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 805aaa5639d2..e967728d1ee7 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -946,7 +946,7 @@ xfs_attr_defer_replace(
 }
 
 /* Removes an attribute for an inode as a deferred operation */
-static int
+int
 xfs_attr_defer_remove(
 	struct xfs_da_args	*args)
 {
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 0cf23f5117ad..033005542b9e 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -545,6 +545,7 @@ bool xfs_attr_is_leaf(struct xfs_inode *ip);
 int xfs_attr_get_ilocked(struct xfs_da_args *args);
 int xfs_attr_get(struct xfs_da_args *args);
 int xfs_attr_defer_add(struct xfs_da_args *args);
+int xfs_attr_defer_remove(struct xfs_da_args *args);
 int xfs_attr_set(struct xfs_da_args *args);
 int xfs_attr_set_iter(struct xfs_attr_intent *attr);
 int xfs_attr_remove_iter(struct xfs_attr_intent *attr);
diff --git a/fs/xfs/libxfs/xfs_parent.c b/fs/xfs/libxfs/xfs_parent.c
index dddbf096a4b5..378fa227b87f 100644
--- a/fs/xfs/libxfs/xfs_parent.c
+++ b/fs/xfs/libxfs/xfs_parent.c
@@ -124,6 +124,23 @@ xfs_parent_defer_add(
 	return xfs_attr_defer_add(args);
 }
 
+int
+xfs_parent_defer_remove(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*dp,
+	struct xfs_parent_defer	*parent,
+	xfs_dir2_dataptr_t	diroffset,
+	struct xfs_inode	*child)
+{
+	struct xfs_da_args	*args = &parent->args;
+
+	xfs_init_parent_name_rec(&parent->rec, dp, diroffset);
+	args->trans = tp;
+	args->dp = child;
+	args->hashval = xfs_da_hashname(args->name, args->namelen);
+	return xfs_attr_defer_remove(args);
+}
+
 void
 xfs_parent_cancel(
 	xfs_mount_t		*mp,
diff --git a/fs/xfs/libxfs/xfs_parent.h b/fs/xfs/libxfs/xfs_parent.h
index 971044458f8a..79d3fabb5e56 100644
--- a/fs/xfs/libxfs/xfs_parent.h
+++ b/fs/xfs/libxfs/xfs_parent.h
@@ -27,6 +27,10 @@ int xfs_parent_init(xfs_mount_t *mp, struct xfs_parent_defer **parentp);
 int xfs_parent_defer_add(struct xfs_trans *tp, struct xfs_parent_defer *parent,
 			 struct xfs_inode *dp, struct xfs_name *parent_name,
 			 xfs_dir2_dataptr_t diroffset, struct xfs_inode *child);
+int xfs_parent_defer_remove(struct xfs_trans *tp, struct xfs_inode *dp,
+			    struct xfs_parent_defer *parent,
+			    xfs_dir2_dataptr_t diroffset,
+			    struct xfs_inode *child);
 void xfs_parent_cancel(xfs_mount_t *mp, struct xfs_parent_defer *parent);
 
 #endif	/* __XFS_PARENT_H__ */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index af3f5edb7319..1a35dc972d4d 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2465,16 +2465,18 @@ xfs_iunpin_wait(
  */
 int
 xfs_remove(
-	xfs_inode_t             *dp,
+	struct xfs_inode	*dp,
 	struct xfs_name		*name,
-	xfs_inode_t		*ip)
+	struct xfs_inode	*ip)
 {
-	xfs_mount_t		*mp = dp->i_mount;
-	xfs_trans_t             *tp = NULL;
+	struct xfs_mount	*mp = dp->i_mount;
+	struct xfs_trans	*tp = NULL;
 	int			is_dir = S_ISDIR(VFS_I(ip)->i_mode);
 	int			dontcare;
 	int                     error = 0;
 	uint			resblks;
+	xfs_dir2_dataptr_t	dir_offset;
+	struct xfs_parent_defer	*parent = NULL;
 
 	trace_xfs_remove(dp, name);
 
@@ -2489,6 +2491,12 @@ xfs_remove(
 	if (error)
 		goto std_return;
 
+	if (xfs_has_parent(mp)) {
+		error = xfs_parent_init(mp, &parent);
+		if (error)
+			goto std_return;
+	}
+
 	/*
 	 * We try to get the real space reservation first, allowing for
 	 * directory btree deletion(s) implying possible bmap insert(s).  If we
@@ -2505,7 +2513,7 @@ xfs_remove(
 			&tp, &dontcare);
 	if (error) {
 		ASSERT(error != -ENOSPC);
-		goto std_return;
+		goto drop_incompat;
 	}
 
 	/*
@@ -2559,12 +2567,18 @@ xfs_remove(
 	if (error)
 		goto out_trans_cancel;
 
-	error = xfs_dir_removename(tp, dp, name, ip->i_ino, resblks, NULL);
+	error = xfs_dir_removename(tp, dp, name, ip->i_ino, resblks, &dir_offset);
 	if (error) {
 		ASSERT(error != -ENOENT);
 		goto out_trans_cancel;
 	}
 
+	if (parent) {
+		error = xfs_parent_defer_remove(tp, dp, parent, dir_offset, ip);
+		if (error)
+			goto out_trans_cancel;
+	}
+
 	/*
 	 * If this is a synchronous mount, make sure that the
 	 * remove transaction goes to disk before returning to
@@ -2589,6 +2603,9 @@ xfs_remove(
  out_unlock:
 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+ drop_incompat:
+	if (parent)
+		xfs_parent_cancel(mp, parent);
  std_return:
 	return error;
 }
-- 
2.25.1