linux-kernel - [PATCH v2 02/12] ext4: mballoc: Remove useless setting of ac

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Message-Id: <1dbae05617519cb6202f1b299c9d1be3e7cda763.1685449706.git.ojaswin@linux.ibm.com>
Date:   Tue, 30 May 2023 18:03:40 +0530
From:   Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To:     linux-ext4@...r.kernel.org, "Theodore Ts'o" <tytso@....edu>
Cc:     Ritesh Harjani <riteshh@...ux.ibm.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jan Kara <jack@...e.cz>,
        Kemeng Shi <shikemeng@...weicloud.com>,
        "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Subject: [PATCH v2 02/12] ext4: mballoc: Remove useless setting of ac_criteria

From: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>

There will be changes coming in future patches which will introduce a new
criteria for block allocation. This removes the useless setting of ac_criteria.
AFAIU, this might be only used to differentiate between whether a preallocated
blocks was allocated or was regular allocator called for allocating blocks.
Hence this also adds the debug prints to identify what type of block allocation
was done in ext4_mb_show_ac().

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
Signed-off-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
Reviewed-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/mballoc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 7ac6d3524f29..9d73f61458d4 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4627,7 +4627,6 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
 			atomic_inc(&tmp_pa->pa_count);
 			ext4_mb_use_inode_pa(ac, tmp_pa);
 			spin_unlock(&tmp_pa->pa_lock);
-			ac->ac_criteria = 10;
 			read_unlock(&ei->i_prealloc_lock);
 			return true;
 		}
@@ -4670,7 +4669,6 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
 	}
 	if (cpa) {
 		ext4_mb_use_group_pa(ac, cpa);
-		ac->ac_criteria = 20;
 		return true;
 	}
 	return false;
@@ -5444,6 +5442,10 @@ static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
 			(unsigned long)ac->ac_b_ex.fe_logical,
 			(int)ac->ac_criteria);
 	mb_debug(sb, "%u found", ac->ac_found);
+	mb_debug(sb, "used pa: %s, ", ac->ac_pa ? "yes" : "no");
+	if (ac->ac_pa)
+		mb_debug(sb, "pa_type %s\n", ac->ac_pa->pa_type == MB_GROUP_PA ?
+			 "group pa" : "inode pa");
 	ext4_mb_show_pa(sb);
 }
 #else
-- 
2.31.1