xfs: don't treat all radix_tree_insert errors as -EEXIST

Return other errors to the caller instead.  Note that there really
shouldn't be any other errors because the entry is preallocated, but
if there were, we'd better return them instead of retrying forever.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: Christoph Hellwig

fs/xfs/xfs_dquot.c

@@ -860,7 +860,6 @@ xfs_qm_dqget_cache_insert(
 	mutex_lock(&qi->qi_tree_lock);
 	error = radix_tree_insert(tree, id, dqp);
 	if (unlikely(error)) {
-		/* Duplicate found!  Caller must try again. */
 		trace_xfs_dqget_dup(dqp);
 		goto out_unlock;
 	}
@@ -935,13 +934,16 @@ xfs_qm_dqget(
 
 	error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp);
 	if (error) {
-		/*
-		 * Duplicate found. Just throw away the new dquot and start
-		 * over.
-		 */
 		xfs_qm_dqdestroy(dqp);
-		XFS_STATS_INC(mp, xs_qm_dquot_dups);
-		goto restart;
+		if (error == -EEXIST) {
+			/*
+			 * Duplicate found. Just throw away the new dquot and
+			 * start over.
+			 */
+			XFS_STATS_INC(mp, xs_qm_dquot_dups);
+			goto restart;
+		}
+		return error;
 	}
 
 	trace_xfs_dqget_miss(dqp);
@@ -1060,13 +1062,16 @@ xfs_qm_dqget_inode(
 
 	error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp);
 	if (error) {
-		/*
-		 * Duplicate found. Just throw away the new dquot and start
-		 * over.
-		 */
 		xfs_qm_dqdestroy(dqp);
-		XFS_STATS_INC(mp, xs_qm_dquot_dups);
-		goto restart;
+		if (error == -EEXIST) {
+			/*
+			 * Duplicate found. Just throw away the new dquot and
+			 * start over.
+			 */
+			XFS_STATS_INC(mp, xs_qm_dquot_dups);
+			goto restart;
+		}
+		return error;
 	}
 
 dqret: