[PATCH 04/21] xfs: Add attibute remove and helper functions

[Allison Henderson <allison.henderson@xxxxxxxxxx>]

This patch adds xfs_attr_remove_args. These sub-routines remove
the attributes specified in @args. We will use this later for setting
parent pointers as a deferred attribute operation.

Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_attr.c | 43 +++++++++++++++++++++++++++++++++----------
 fs/xfs/libxfs/xfs_attr.h |  1 +
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 99c4a31..514f4f8 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -296,6 +296,34 @@ xfs_attr_set_args(
 }
 
 /*
+ * Remove the attribute specified in @args.
+ */
+int
+xfs_attr_remove_args(
+	struct xfs_da_args      *args,
+	int			flags,
+	bool                    roll_trans)
+{
+	struct xfs_inode	*dp = args->dp;
+	int			error;
+
+	xfs_trans_ijoin(args->trans, dp, 0);
+
+	if (!xfs_inode_hasattr(dp)) {
+		error = -ENOATTR;
+	} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
+		ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
+		error = xfs_attr_shortform_remove(args, roll_trans);
+	} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
+		error = xfs_attr_leaf_removename(args, roll_trans);
+	} else {
+		error = xfs_attr_node_removename(args, roll_trans);
+	}
+
+	return error;
+}
+
+/*
  * Calculate how many blocks we need for the new attribute,
  */
 STATIC int
@@ -439,6 +467,7 @@ xfs_attr_set(
 	return error;
 }
 
+
 /*
  * Generic handler routine to remove a name from an attribute list.
  * Transitions attribute list from Btree to shortform as necessary.
@@ -495,17 +524,9 @@ xfs_attr_remove(
 	 * blocks not allocate in the common case.
 	 */
 	xfs_trans_ijoin(args.trans, dp, 0);
+	xfs_defer_init(args.dfops, args.firstblock);
 
-	if (!xfs_inode_hasattr(dp)) {
-		error = -ENOATTR;
-	} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
-		ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
-		error = xfs_attr_shortform_remove(&args, true);
-	} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
-		error = xfs_attr_leaf_removename(&args, true);
-	} else {
-		error = xfs_attr_node_removename(&args, true);
-	}
+	error = xfs_attr_remove_args(&args, flags, true);
 
 	if (error)
 		goto out;
@@ -530,6 +551,8 @@ xfs_attr_remove(
 	return error;
 
 out:
+	xfs_defer_cancel(&dfops);
+
 	if (args.trans)
 		xfs_trans_cancel(args.trans);
 	xfs_iunlock(dp, XFS_ILOCK_EXCL);
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index b5dc02c..ef6b47e 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -155,6 +155,7 @@ int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
 int xfs_attr_set_args(struct xfs_da_args *args, int flags,
 			struct xfs_buf *leaf_bp, bool roll_trans);
 int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
+int xfs_attr_remove_args(struct xfs_da_args *args, int flags, bool roll_trans);
 int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
 		  int flags, struct attrlist_cursor_kern *cursor);
 
-- 
2.7.4

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