linux-kernel - [PATCH 03/21] ext4: avoid to use preallocated blocks if EXT4_MB_HINT_GOAL

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Date:   Fri, 10 Feb 2023 03:48:07 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 03/21] ext4: avoid to use preallocated blocks if EXT4_MB_HINT_GOAL_ONLY is set

ext4_mb_use_preallocated will ignore the demand to alloc at goal block
only. Return false if EXT4_MB_HINT_GOAL_ONLY is set before use
preallocated blocks in ext4_mb_use_preallocated.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 fs/ext4/mballoc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 375d9655b525..352ac9139fee 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4368,6 +4368,9 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
 	if (!(ac->ac_flags & EXT4_MB_HINT_DATA))
 		return false;
 
+	if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY))
+		return false;
+
 	/* first, try per-file preallocation */
 	rcu_read_lock();
 	list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
-- 
2.30.0