[PATCH v22 22/27] xfsprogs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred

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

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

These routines set up and queue a new deferred attribute operations.
These functions are meant to be called by any routine needing to
initiate a deferred attribute operation as opposed to the existing
inline operations. New helper function xfs_attr_item_init also added.

Finally enable delayed attributes in xfs_attr_set and xfs_attr_remove.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 libxfs/libxfs_priv.h |  4 ++++
 libxfs/xfs_attr.c    | 68 +++++++++++++++++++++++++++++++++++++++++++++++++---
 libxfs/xfs_attr.h    |  2 ++
 3 files changed, 71 insertions(+), 3 deletions(-)

diff --git a/libxfs/libxfs_priv.h b/libxfs/libxfs_priv.h
index 0272ef2..0d4ec11 100644
--- a/libxfs/libxfs_priv.h
+++ b/libxfs/libxfs_priv.h
@@ -614,9 +614,13 @@ typedef int (*xfs_rtalloc_query_range_fn)(
 int libxfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
                         xfs_off_t count_fsb);
 
+/* xfs_log.c */
+struct xlog;
 
 bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
 void xfs_log_item_init(struct xfs_mount *, struct xfs_log_item *, int);
+int xfs_attr_use_log_assist(struct xfs_mount *mp);
+void xlog_drop_incompat_feat(struct xlog *log);
 #define xfs_log_in_recovery(mp)	(false)
 
 /* xfs_icache.c */
diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index 9967719..260ae8f 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -778,13 +778,19 @@ xfs_attr_set(
 		rmt_blks = xfs_attr3_rmt_blocks(mp, XFS_XATTR_SIZE_MAX);
 	}
 
+	if (xfs_hasdelattr(mp)) {
+		error = xfs_attr_use_log_assist(mp);
+		if (error)
+			return error;
+	}
+
 	/*
 	 * Root fork attributes can use reserved data blocks for this
 	 * operation if necessary
 	 */
 	error = xfs_trans_alloc_inode(dp, &tres, total, 0, rsvd, &args->trans);
 	if (error)
-		return error;
+		goto drop_incompat;
 
 	if (args->value || xfs_inode_hasattr(dp)) {
 		error = xfs_iext_count_may_overflow(dp, XFS_ATTR_FORK,
@@ -802,9 +808,10 @@ xfs_attr_set(
 		if (error != -ENOATTR && error != -EEXIST)
 			goto out_trans_cancel;
 
-		error = xfs_attr_set_args(args);
+		error = xfs_attr_set_deferred(args);
 		if (error)
 			goto out_trans_cancel;
+
 		/* shortform attribute has already been committed */
 		if (!args->trans)
 			goto out_unlock;
@@ -813,7 +820,7 @@ xfs_attr_set(
 		if (error != -EEXIST)
 			goto out_trans_cancel;
 
-		error = xfs_attr_remove_args(args);
+		error = xfs_attr_remove_deferred(args);
 		if (error)
 			goto out_trans_cancel;
 	}
@@ -835,6 +842,9 @@ xfs_attr_set(
 	error = xfs_trans_commit(args->trans);
 out_unlock:
 	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+drop_incompat:
+	if (xfs_hasdelattr(mp))
+		xlog_drop_incompat_feat(mp->m_log);
 	return error;
 
 out_trans_cancel:
@@ -843,6 +853,58 @@ out_trans_cancel:
 	goto out_unlock;
 }
 
+STATIC int
+xfs_attr_item_init(
+	struct xfs_da_args	*args,
+	unsigned int		op_flags,	/* op flag (set or remove) */
+	struct xfs_attr_item	**attr)		/* new xfs_attr_item */
+{
+
+	struct xfs_attr_item	*new;
+
+	new = kmem_zalloc(sizeof(struct xfs_attr_item), KM_NOFS);
+	new->xattri_op_flags = op_flags;
+	new->xattri_dac.da_args = args;
+
+	*attr = new;
+	return 0;
+}
+
+/* Sets an attribute for an inode as a deferred operation */
+int
+xfs_attr_set_deferred(
+	struct xfs_da_args	*args)
+{
+	struct xfs_attr_item	*new;
+	int			error = 0;
+
+	error = xfs_attr_item_init(args, XFS_ATTR_OP_FLAGS_SET, &new);
+	if (error)
+		return error;
+
+	xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
+
+	return 0;
+}
+
+/* Removes an attribute for an inode as a deferred operation */
+int
+xfs_attr_remove_deferred(
+	struct xfs_da_args	*args)
+{
+
+	struct xfs_attr_item	*new;
+	int			error;
+
+	error  = xfs_attr_item_init(args, XFS_ATTR_OP_FLAGS_REMOVE, &new);
+	if (error)
+		return error;
+
+	xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
+
+	return 0;
+}
+
 /*========================================================================
  * External routines when attribute list is inside the inode
  *========================================================================*/
diff --git a/libxfs/xfs_attr.h b/libxfs/xfs_attr.h
index 463b2be..72b0ea5 100644
--- a/libxfs/xfs_attr.h
+++ b/libxfs/xfs_attr.h
@@ -527,5 +527,7 @@ bool xfs_attr_namecheck(const void *name, size_t length);
 void xfs_delattr_context_init(struct xfs_delattr_context *dac,
 			      struct xfs_da_args *args);
 int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
+int xfs_attr_set_deferred(struct xfs_da_args *args);
+int xfs_attr_remove_deferred(struct xfs_da_args *args);
 
 #endif	/* __XFS_ATTR_H__ */
-- 
2.7.4