linux-ext4 - [PATCH v5 1/2] ext4: Discard preallocations before releasing group lock

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Date:   Wed, 16 Sep 2020 19:38:58 +0800
From:   Ye Bin <yebin10@...wei.com>
To:     <riteshh@...ux.ibm.com>, <jack@...e.cz>, <tytso@....edu>,
        <adilger.kernel@...ger.ca>, <jack@...e.com>,
        <linux-ext4@...r.kernel.org>
CC:     Ye Bin <yebin10@...wei.com>
Subject: [PATCH v5 1/2] ext4: Discard preallocations before releasing group lock

From: Jan Kara <jack@...e.cz>

ext4_mb_discard_group_preallocations() can be releasing group lock with
preallocations accumulated on its local list. Thus although
discard_pa_seq was incremented and concurrent allocating processes will
be retrying allocations, it can happen that premature ENOSPC error is
returned because blocks used for preallocations are not available for
reuse yet. Make sure we always free locally accumulated preallocations
before releasing group lock.

Fixes: 07b5b8e1ac40 ("ext4: mballoc: introduce pcpu seqcnt for freeing PA to improve ENOSPC handling")
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Ye Bin <yebin10@...wei.com>
Reviewed-by: Ritesh Harjani <riteshh@...ux.ibm.com>
---
 fs/ext4/mballoc.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 132c118d12e1..f736819a381b 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4215,22 +4215,6 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
 		list_add(&pa->u.pa_tmp_list, &list);
 	}
 
-	/* if we still need more blocks and some PAs were used, try again */
-	if (free < needed && busy) {
-		busy = 0;
-		ext4_unlock_group(sb, group);
-		cond_resched();
-		goto repeat;
-	}
-
-	/* found anything to free? */
-	if (list_empty(&list)) {
-		BUG_ON(free != 0);
-		mb_debug(sb, "Someone else may have freed PA for this group %u\n",
-			 group);
-		goto out;
-	}
-
 	/* now free all selected PAs */
 	list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) {
 
@@ -4248,7 +4232,17 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
 		call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback);
 	}
 
-out:
+	/* if we still need more blocks and some PAs were used, try again */
+	if (free < needed && busy) {
+		ext4_unlock_group(sb, group);
+		cond_resched();
+		busy = 0;
+		/* Make sure we increment discard_pa_seq again */
+		needed -= free;
+		free = 0;
+		goto repeat;
+	}
+
 	ext4_unlock_group(sb, group);
 	ext4_mb_unload_buddy(&e4b);
 	put_bh(bitmap_bh);
-- 
2.25.4