linux-kernel - [PATCH 02/10] ext4: optimize the EXT4_GET_BLOCKS_DELALLOC

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Date: Sat,  1 Jun 2024 11:41:41 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-ext4@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	ritesh.list@...il.com,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com
Subject: [PATCH 02/10] ext4: optimize the EXT4_GET_BLOCKS_DELALLOC_RESERVE flag set

From: Zhang Yi <yi.zhang@...wei.com>

When doing block allocation, magic EXT4_GET_BLOCKS_DELALLOC_RESERVE
means the allocating range covers a range of delayed allocated clusters,
the blocks and quotas have already been reserved in ext4_da_map_blocks(),
we should update the reserved space and don't need to claim them again.

At the moment, we only set this magic in mpage_map_one_extent() when
allocating a range of delayed allocated clusters in the write back path,
it makes things complicated since we have to notice and deal with the
case of allocating non-delayed allocated clusters separately in
ext4_ext_map_blocks(). For example, it we fallocate some blocks that
have been delayed allocated, free space would be claimed again in
ext4_mb_new_blocks() (this is wrong exactily), and we can't claim quota
space again, we have to release the quota reservations made for that
previously delayed allocated clusters.

Move the position thats set the EXT4_GET_BLOCKS_DELALLOC_RESERVE to
where we actually do block allocation, it could simplify above handling
a lot, it means that we always set this magic once the allocation range
covers delalloc blocks, no need to take care of the allocation path.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/inode.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 01a30483e521..1f6de35e6216 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -489,6 +489,14 @@ static int ext4_map_create_blocks(handle_t *handle, struct inode *inode,
 	unsigned int status;
 	int err, retval = 0;

+	/*
+	 * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE
+	 * indicates that the blocks and quotas has already been
+	 * checked when the data was copied into the page cache.
+	 */
+	if (map->m_flags & EXT4_MAP_DELAYED)
+		flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE;
+
 	/*
 	 * Here we clear m_flags because after allocating an new extent,
 	 * it will be set again.
@@ -2224,11 +2232,6 @@ static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)
 	 * writeback and there is nothing we can do about it so it might result
 	 * in data loss.  So use reserved blocks to allocate metadata if
 	 * possible.
-	 *
-	 * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE if
-	 * the blocks in question are delalloc blocks.  This indicates
-	 * that the blocks and quotas has already been checked when
-	 * the data was copied into the page cache.
 	 */
 	get_blocks_flags = EXT4_GET_BLOCKS_CREATE |
 			   EXT4_GET_BLOCKS_METADATA_NOFAIL |
@@ -2236,8 +2239,6 @@ static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)
 	dioread_nolock = ext4_should_dioread_nolock(inode);
 	if (dioread_nolock)
 		get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT;
-	if (map->m_flags & BIT(BH_Delay))
-		get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE;

 	err = ext4_map_blocks(handle, inode, map, get_blocks_flags);
 	if (err < 0)
-- 
2.31.1