linux-kernel - [PATCH v2] xfs: Use for_each_perag_from() to iterate all available AGs

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Date:   Tue, 11 Apr 2023 01:07:27 +0900
From:   Ryosuke Yasuoka <ryasuoka@...hat.com>
To:     djwong@...nel.org
Cc:     linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        sandeen@...deen.net, david@...morbit.com,
        Ryosuke Yasuoka <ryasuoka@...hat.com>
Subject: [PATCH v2] xfs: Use for_each_perag_from() to iterate all available AGs

xfs_filestream_pick_ag() iterates all the available AGs when no
unassociated AGs are available by using for_each_perag_wrap().
To iterate all the available AGs, just use for_each_perag_from() instead.

This patch cleans up a code where xfs_filestream_pick_ag() iterates 
all the available AGs when no unassociated AGs are available.
Current implementation is using a for_each_perag_wrap() macro which
iterates all AGs from start_agno through wrap_agno, wraps to
restart_agno, and then iterates again toward to (start_agno - 1).
In this case, xfs_filestream_pick_ag() start to iterate from 0 and
does't need to wrap. Although passing 0 as start_agno to
for_each_perag_wrap() 
is not problematic, we have already a for_each_perag() macro family
which just iterates all AGs from 0 and doesn't wrap. Hense, I propose
to use for_each_perag() family simply.

Changes since v1 [1]:
Use for_each_perag_from() instead of for_each_perag() to clarify
where we are iterating from.

[1]:
https://lore.kernel.org/linux-xfs/CAHpthZrvhqh8O1HO7U_jVnaq9R9Ur=Yq2eWzjWfNx3ryDbnGPA@mail.gmail.com/T/#m5704d0409bec1ce5273be0d3860e8ad60e9886fd

Signed-off-by: Ryosuke Yasuoka <ryasuoka@...hat.com>
---
 fs/xfs/xfs_filestream.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_filestream.c b/fs/xfs/xfs_filestream.c
index 22c13933c8f8..29acd9f7d422 100644
--- a/fs/xfs/xfs_filestream.c
+++ b/fs/xfs/xfs_filestream.c
@@ -151,7 +151,8 @@ xfs_filestream_pick_ag(
 		 * grab.
 		 */
 		if (!max_pag) {
-			for_each_perag_wrap(args->mp, 0, start_agno, args->pag)
+			start_agno = 0;
+			for_each_perag_from(args->mp, start_agno, args->pag)
 				break;
 			atomic_inc(&args->pag->pagf_fstrms);
 			*longest = 0;
-- 
2.39.2