linux-ext4 - [RFC 01/11] ext4: mballoc: Remove useless setting of ac

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Date:   Fri, 27 Jan 2023 18:07:28 +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>, Ritesh Harjani <ritesh.list@...il.com>
Subject: [RFC 01/11] ext4: mballoc: Remove useless setting of ac_criteria

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>
---
 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 5b2ae37a8b80..572e79a698d4 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4391,7 +4391,6 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
 			atomic_inc(&pa->pa_count);
 			ext4_mb_use_inode_pa(ac, pa);
 			spin_unlock(&pa->pa_lock);
-			ac->ac_criteria = 10;
 			rcu_read_unlock();
 			return true;
 		}
@@ -4434,7 +4433,6 @@ 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;
@@ -5131,6 +5129,10 @@ 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