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From: Ritesh Harjani <riteshh@linux.ibm.com>
To: linux-ext4@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, Jan Kara <jack@suse.com>,
	tytso@mit.edu, "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
	linux-kernel@vger.kernel.org,
	Ritesh Harjani <riteshh@linux.ibm.com>
Subject: [PATCHv5 2/5] ext4: mballoc: Refactor ext4_mb_discard_preallocations()
Date: Wed, 20 May 2020 12:10:33 +0530	[thread overview]
Message-ID: <1cfae0098d2aa9afbeb59331401258182868c8f2.1589955723.git.riteshh@linux.ibm.com> (raw)
In-Reply-To: <cover.1589955723.git.riteshh@linux.ibm.com>

Implement ext4_mb_discard_preallocations_should_retry()
which we will need in later patches to add more logic
like check for sequence number match to see if we should
retry for block allocation or not.

There should be no functionality change in this patch.

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
---
 fs/ext4/mballoc.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index decc5168d126..b75408d72773 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4543,6 +4543,17 @@ static int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
 	return freed;
 }
 
+static bool ext4_mb_discard_preallocations_should_retry(struct super_block *sb,
+			struct ext4_allocation_context *ac)
+{
+	int freed;
+
+	freed = ext4_mb_discard_preallocations(sb, ac->ac_o_ex.fe_len);
+	if (freed)
+		return true;
+	return false;
+}
+
 /*
  * Main entry point into mballoc to allocate blocks
  * it tries to use preallocation first, then falls back
@@ -4551,7 +4562,6 @@ static int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
 ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
 				struct ext4_allocation_request *ar, int *errp)
 {
-	int freed;
 	struct ext4_allocation_context *ac = NULL;
 	struct ext4_sb_info *sbi;
 	struct super_block *sb;
@@ -4656,8 +4666,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
 			ar->len = ac->ac_b_ex.fe_len;
 		}
 	} else {
-		freed  = ext4_mb_discard_preallocations(sb, ac->ac_o_ex.fe_len);
-		if (freed)
+		if (ext4_mb_discard_preallocations_should_retry(sb, ac))
 			goto repeat;
 		/*
 		 * If block allocation fails then the pa allocated above
-- 
2.21.0


  parent reply	other threads:[~2020-05-20  6:41 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-20  6:40 [PATCHv5 0/5] Improve ext4 handling of ENOSPC with multi-threaded use-case Ritesh Harjani
2020-05-20  6:40 ` [PATCHv5 1/5] ext4: mballoc: Add blocks to PA list under same spinlock after allocating blocks Ritesh Harjani
2020-05-20  6:40 ` Ritesh Harjani [this message]
2020-05-20  6:40 ` [PATCHv5 3/5] ext4: mballoc: Introduce pcpu seqcnt for freeing PA to improve ENOSPC handling Ritesh Harjani
     [not found]   ` <CGME20200603064851eucas1p2e435089fbdf4de1d1fa3fb051c2f3d7b@eucas1p2.samsung.com>
2020-06-03  6:48     ` Marek Szyprowski
2020-06-03 10:10       ` Ritesh Harjani
2020-06-09 10:20         ` Borislav Petkov
2020-06-09 10:37           ` Ritesh Harjani
2020-05-20  6:40 ` [PATCHv5 4/5] ext4: mballoc: Refactor ext4_mb_good_group() Ritesh Harjani
2020-05-20  6:40 ` [PATCHv5 5/5] ext4: mballoc: Use lock for checking free blocks while retrying Ritesh Harjani
2020-05-29  2:40 ` [PATCHv5 0/5] Improve ext4 handling of ENOSPC with multi-threaded use-case Theodore Y. Ts'o

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