xfs: kill XFS_DAC_LEAF_ADDNAME_INIT

We re-enter the XFS_DAS_FOUND_LBLK state when we have to allocate
multiple extents for a remote xattr. We currently have a flag
called XFS_DAC_LEAF_ADDNAME_INIT to avoid running the remote attr
hole finding code more than once.

However, for the node format tree, we have a separate state for this
so we never reenter the state machine at XFS_DAS_FOUND_NBLK and so
it does not need a special flag to skip over the remote attr hold
finding code.

Convert the leaf block code to use the same state machine as the
node blocks and kill the  XFS_DAC_LEAF_ADDNAME_INIT flag.

This further points out that this "ALLOC" state is only traversed
if we have remote xattrs or we are doing a rename operation. Rename
both the leaf and node alloc states to _ALLOC_RMT to indicate they
are iterating to do allocation of remote xattr blocks.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Allison Henderson<allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/libxfs/xfs_attr.c

@@ -405,40 +405,41 @@ xfs_attr_set_iter(
 		return xfs_attr_node_addname(attr);
 
 	case XFS_DAS_FOUND_LBLK:
+		/*
+		 * Find space for remote blocks and fall into the allocation
+		 * state.
+		 */
+		if (args->rmtblkno > 0) {
+			error = xfs_attr_rmtval_find_space(attr);
+			if (error)
+				return error;
+		}
+		attr->xattri_dela_state = XFS_DAS_LEAF_ALLOC_RMT;
+		fallthrough;
+	case XFS_DAS_LEAF_ALLOC_RMT:
+
 		/*
 		 * If there was an out-of-line value, allocate the blocks we
 		 * identified for its storage and copy the value.  This is done
 		 * after we create the attribute so that we don't overflow the
 		 * maximum size of a transaction and/or hit a deadlock.
 		 */
-
-		/* Open coded xfs_attr_rmtval_set without trans handling */
-		if ((attr->xattri_flags & XFS_DAC_LEAF_ADDNAME_INIT) == 0) {
-			attr->xattri_flags |= XFS_DAC_LEAF_ADDNAME_INIT;
-			if (args->rmtblkno > 0) {
-				error = xfs_attr_rmtval_find_space(attr);
+		if (args->rmtblkno > 0) {
+			if (attr->xattri_blkcnt > 0) {
+				error = xfs_attr_rmtval_set_blk(attr);
 				if (error)
 					return error;
+				trace_xfs_attr_set_iter_return(
+						attr->xattri_dela_state,
+						args->dp);
+				return -EAGAIN;
 			}
-		}
 
-		/*
-		 * Repeat allocating remote blocks for the attr value until
-		 * blkcnt drops to zero.
-		 */
-		if (attr->xattri_blkcnt > 0) {
-			error = xfs_attr_rmtval_set_blk(attr);
+			error = xfs_attr_rmtval_set_value(args);
 			if (error)
 				return error;
-			trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
-						       args->dp);
-			return -EAGAIN;
 		}
 
-		error = xfs_attr_rmtval_set_value(args);
-		if (error)
-			return error;
-
 		/*
 		 * If this is not a rename, clear the incomplete flag and we're
 		 * done.
@@ -533,15 +534,15 @@ xfs_attr_set_iter(
 				return error;
 		}
 
+		attr->xattri_dela_state = XFS_DAS_NODE_ALLOC_RMT;
 		fallthrough;
-	case XFS_DAS_ALLOC_NODE:
+	case XFS_DAS_NODE_ALLOC_RMT:
 		/*
 		 * If there was an out-of-line value, allocate the blocks we
 		 * identified for its storage and copy the value.  This is done
 		 * after we create the attribute so that we don't overflow the
 		 * maximum size of a transaction and/or hit a deadlock.
 		 */
-		attr->xattri_dela_state = XFS_DAS_ALLOC_NODE;
 		if (args->rmtblkno > 0) {
 			if (attr->xattri_blkcnt > 0) {
 				error = xfs_attr_rmtval_set_blk(attr);

fs/xfs/libxfs/xfs_attr.h

@@ -451,11 +451,12 @@ enum xfs_delattr_state {
 	XFS_DAS_RM_NAME,		/* Remove attr name */
 	XFS_DAS_RM_SHRINK,		/* We are shrinking the tree */
 	XFS_DAS_FOUND_LBLK,		/* We found leaf blk for attr */
+	XFS_DAS_LEAF_ALLOC_RMT,		/* We are allocating remote blocks */
 	XFS_DAS_FOUND_NBLK,		/* We found node blk for attr */
+	XFS_DAS_NODE_ALLOC_RMT,		/* We are allocating remote blocks */
 	XFS_DAS_FLIP_LFLAG,		/* Flipped leaf INCOMPLETE attr flag */
 	XFS_DAS_RM_LBLK,		/* A rename is removing leaf blocks */
 	XFS_DAS_RD_LEAF,		/* Read in the new leaf */
-	XFS_DAS_ALLOC_NODE,		/* We are allocating node blocks */
 	XFS_DAS_FLIP_NFLAG,		/* Flipped node INCOMPLETE attr flag */
 	XFS_DAS_RM_NBLK,		/* A rename is removing node blocks */
 	XFS_DAS_CLR_FLAG,		/* Clear incomplete flag */
@@ -471,11 +472,12 @@ enum xfs_delattr_state {
 	{ XFS_DAS_RM_NAME,	"XFS_DAS_RM_NAME" }, \
 	{ XFS_DAS_RM_SHRINK,	"XFS_DAS_RM_SHRINK" }, \
 	{ XFS_DAS_FOUND_LBLK,	"XFS_DAS_FOUND_LBLK" }, \
+	{ XFS_DAS_LEAF_ALLOC_RMT, "XFS_DAS_LEAF_ALLOC_RMT" }, \
 	{ XFS_DAS_FOUND_NBLK,	"XFS_DAS_FOUND_NBLK" }, \
+	{ XFS_DAS_NODE_ALLOC_RMT, "XFS_DAS_NODE_ALLOC_RMT" },  \
 	{ XFS_DAS_FLIP_LFLAG,	"XFS_DAS_FLIP_LFLAG" }, \
 	{ XFS_DAS_RM_LBLK,	"XFS_DAS_RM_LBLK" }, \
 	{ XFS_DAS_RD_LEAF,	"XFS_DAS_RD_LEAF" }, \
-	{ XFS_DAS_ALLOC_NODE,	"XFS_DAS_ALLOC_NODE" }, \
 	{ XFS_DAS_FLIP_NFLAG,	"XFS_DAS_FLIP_NFLAG" }, \
 	{ XFS_DAS_RM_NBLK,	"XFS_DAS_RM_NBLK" }, \
 	{ XFS_DAS_CLR_FLAG,	"XFS_DAS_CLR_FLAG" }, \

fs/xfs/xfs_trace.h

@@ -4137,11 +4137,12 @@ TRACE_DEFINE_ENUM(XFS_DAS_RMTBLK);
 TRACE_DEFINE_ENUM(XFS_DAS_RM_NAME);
 TRACE_DEFINE_ENUM(XFS_DAS_RM_SHRINK);
 TRACE_DEFINE_ENUM(XFS_DAS_FOUND_LBLK);
+TRACE_DEFINE_ENUM(XFS_DAS_LEAF_ALLOC_RMT);
 TRACE_DEFINE_ENUM(XFS_DAS_FOUND_NBLK);
+TRACE_DEFINE_ENUM(XFS_DAS_NODE_ALLOC_RMT);
 TRACE_DEFINE_ENUM(XFS_DAS_FLIP_LFLAG);
 TRACE_DEFINE_ENUM(XFS_DAS_RM_LBLK);
 TRACE_DEFINE_ENUM(XFS_DAS_RD_LEAF);
-TRACE_DEFINE_ENUM(XFS_DAS_ALLOC_NODE);
 TRACE_DEFINE_ENUM(XFS_DAS_FLIP_NFLAG);
 TRACE_DEFINE_ENUM(XFS_DAS_RM_NBLK);
 TRACE_DEFINE_ENUM(XFS_DAS_CLR_FLAG);