[PATCH v7 07/23] xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred

[Allison Henderson <allison.henderson@oracle.com>]

These routines set up set and start a new deferred attribute
operation.  These functions are meant to be called by other
code needing to initiate a deferred attribute operation.  We
will use these routines later in the parent pointer patches.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/libxfs/xfs_attr.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++
 fs/xfs/libxfs/xfs_attr.h |  5 ++++
 2 files changed, 77 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 408a49d..c1844ae 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -477,6 +477,44 @@ xfs_attr_set(
 	return error;
 }
 
+/* Sets an attribute for an inode as a deferred operation */
+int
+xfs_attr_set_deferred(
+	struct xfs_inode	*dp,
+	struct xfs_defer_ops    *dfops,
+	void			*name,
+	unsigned int		namelen,
+	void			*value,
+	unsigned int		valuelen,
+	int			flags)
+{
+
+	struct xfs_attr_item	*new;
+	char			*name_value;
+
+	if (!namelen || !valuelen) {
+		ASSERT(0);
+		return -EFSCORRUPTED;
+	}
+
+	new = kmem_alloc(XFS_ATTR_ITEM_SIZEOF(namelen, valuelen),
+			 KM_SLEEP|KM_NOFS);
+	name_value = ((char *)new) + sizeof(struct xfs_attr_item);
+	memset(new, 0, XFS_ATTR_ITEM_SIZEOF(namelen, valuelen));
+	new->xattri_ip = dp;
+	new->xattri_op_flags = XFS_ATTR_OP_FLAGS_SET;
+	new->xattri_name_len = namelen;
+	new->xattri_value_len = valuelen;
+	new->xattri_flags = flags;
+	memcpy(&name_value[0], name, namelen);
+	memcpy(&name_value[namelen], value, valuelen);
+
+	xfs_defer_ijoin(dfops, dp);
+	xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
+
+	return 0;
+}
+
 /*
  * Generic handler routine to remove a name from an attribute list.
  * Transitions attribute list from Btree to shortform as necessary.
@@ -565,6 +603,40 @@ xfs_attr_remove(
 	return error;
 }
 
+/* Removes an attribute for an inode as a deferred operation */
+int
+xfs_attr_remove_deferred(
+	struct xfs_inode        *dp,
+	struct xfs_defer_ops    *dfops,
+	void			*name,
+	unsigned int		namelen,
+	int                     flags)
+{
+
+	struct xfs_attr_item	*new;
+	char			*name_value;
+
+	if (!namelen) {
+		ASSERT(0);
+		return -EFSCORRUPTED;
+	}
+
+	new = kmem_alloc(XFS_ATTR_ITEM_SIZEOF(namelen, 0), KM_SLEEP|KM_NOFS);
+	name_value = ((char *)new) + sizeof(struct xfs_attr_item);
+	memset(new, 0, XFS_ATTR_ITEM_SIZEOF(namelen, 0));
+	new->xattri_ip = dp;
+	new->xattri_op_flags = XFS_ATTR_OP_FLAGS_REMOVE;
+	new->xattri_name_len = namelen;
+	new->xattri_value_len = 0;
+	new->xattri_flags = flags;
+	memcpy(name_value, name, namelen);
+
+	xfs_defer_ijoin(dfops, dp);
+	xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
+
+	return 0;
+}
+
 /*========================================================================
  * External routines when attribute list is inside the inode
  *========================================================================*/
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 33b33d3..ec26565 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -183,5 +183,10 @@ int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
 int xfs_attr_args_init(struct xfs_da_args *args, struct xfs_inode *dp,
 		       const unsigned char *name, int flags);
 int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
+int xfs_attr_set_deferred(struct xfs_inode *dp, struct xfs_defer_ops *dfops,
+			  void *name, unsigned int name_len, void *value,
+			  unsigned int valuelen, int flags);
+int xfs_attr_remove_deferred(struct xfs_inode *dp, struct xfs_defer_ops *dfops,
+			    void *name, unsigned int namelen, int flags);
 
 #endif	/* __XFS_ATTR_H__ */
-- 
2.7.4