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Message-Id: <20240710040654.1714672-21-libaokun@huaweicloud.com>
Date: Wed, 10 Jul 2024 12:06:54 +0800
From: libaokun@...weicloud.com
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu,
adilger.kernel@...ger.ca,
jack@...e.cz,
ritesh.list@...il.com,
linux-kernel@...r.kernel.org,
yi.zhang@...wei.com,
yangerkun@...wei.com,
libaokun@...weicloud.com,
Baokun Li <libaokun1@...wei.com>
Subject: [PATCH 20/20] ext4: avoid unnecessary extent path frees and allocations
From: Baokun Li <libaokun1@...wei.com>
The ext4_find_extent() can update the extent path so that it does not have
to allocate and free the path repeatedly, thus reducing the consumption of
memory allocation and freeing in the following functions:
ext4_ext_clear_bb
ext4_ext_replay_set_iblocks
ext4_fc_replay_add_range
ext4_fc_set_bitmaps_and_counters
No functional changes. Note that ext4_find_extent() does not support error
pointers, so in this case set path to NULL first.
Signed-off-by: Baokun Li <libaokun1@...wei.com>
---
fs/ext4/extents.c | 51 +++++++++++++++++++------------------------
fs/ext4/fast_commit.c | 11 ++++++----
2 files changed, 29 insertions(+), 33 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 737432bb316e..5ff92cd50dc8 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -6068,12 +6068,9 @@ int ext4_ext_replay_set_iblocks(struct inode *inode)
if (IS_ERR(path))
return PTR_ERR(path);
ex = path[path->p_depth].p_ext;
- if (!ex) {
- ext4_free_ext_path(path);
+ if (!ex)
goto out;
- }
end = le32_to_cpu(ex->ee_block) + ext4_ext_get_actual_len(ex);
- ext4_free_ext_path(path);
/* Count the number of data blocks */
cur = 0;
@@ -6099,32 +6096,28 @@ int ext4_ext_replay_set_iblocks(struct inode *inode)
ret = skip_hole(inode, &cur);
if (ret < 0)
goto out;
- path = ext4_find_extent(inode, cur, NULL, 0);
+ path = ext4_find_extent(inode, cur, path, 0);
if (IS_ERR(path))
goto out;
numblks += path->p_depth;
- ext4_free_ext_path(path);
while (cur < end) {
- path = ext4_find_extent(inode, cur, NULL, 0);
+ path = ext4_find_extent(inode, cur, path, 0);
if (IS_ERR(path))
break;
ex = path[path->p_depth].p_ext;
- if (!ex) {
- ext4_free_ext_path(path);
- return 0;
- }
+ if (!ex)
+ goto cleanup;
+
cur = max(cur + 1, le32_to_cpu(ex->ee_block) +
ext4_ext_get_actual_len(ex));
ret = skip_hole(inode, &cur);
- if (ret < 0) {
- ext4_free_ext_path(path);
+ if (ret < 0)
break;
- }
- path2 = ext4_find_extent(inode, cur, NULL, 0);
- if (IS_ERR(path2)) {
- ext4_free_ext_path(path);
+
+ path2 = ext4_find_extent(inode, cur, path2, 0);
+ if (IS_ERR(path2))
break;
- }
+
for (i = 0; i <= max(path->p_depth, path2->p_depth); i++) {
cmp1 = cmp2 = 0;
if (i <= path->p_depth)
@@ -6136,13 +6129,14 @@ int ext4_ext_replay_set_iblocks(struct inode *inode)
if (cmp1 != cmp2 && cmp2 != 0)
numblks++;
}
- ext4_free_ext_path(path);
- ext4_free_ext_path(path2);
}
out:
inode->i_blocks = numblks << (inode->i_sb->s_blocksize_bits - 9);
ext4_mark_inode_dirty(NULL, inode);
+cleanup:
+ ext4_free_ext_path(path);
+ ext4_free_ext_path(path2);
return 0;
}
@@ -6163,12 +6157,9 @@ int ext4_ext_clear_bb(struct inode *inode)
if (IS_ERR(path))
return PTR_ERR(path);
ex = path[path->p_depth].p_ext;
- if (!ex) {
- ext4_free_ext_path(path);
- return 0;
- }
+ if (!ex)
+ goto out;
end = le32_to_cpu(ex->ee_block) + ext4_ext_get_actual_len(ex);
- ext4_free_ext_path(path);
cur = 0;
while (cur < end) {
@@ -6178,16 +6169,16 @@ int ext4_ext_clear_bb(struct inode *inode)
if (ret < 0)
break;
if (ret > 0) {
- path = ext4_find_extent(inode, map.m_lblk, NULL, 0);
- if (!IS_ERR_OR_NULL(path)) {
+ path = ext4_find_extent(inode, map.m_lblk, path, 0);
+ if (!IS_ERR(path)) {
for (j = 0; j < path->p_depth; j++) {
-
ext4_mb_mark_bb(inode->i_sb,
path[j].p_block, 1, false);
ext4_fc_record_regions(inode->i_sb, inode->i_ino,
0, path[j].p_block, 1, 1);
}
- ext4_free_ext_path(path);
+ } else {
+ path = NULL;
}
ext4_mb_mark_bb(inode->i_sb, map.m_pblk, map.m_len, false);
ext4_fc_record_regions(inode->i_sb, inode->i_ino,
@@ -6196,5 +6187,7 @@ int ext4_ext_clear_bb(struct inode *inode)
cur = cur + map.m_len;
}
+out:
+ ext4_free_ext_path(path);
return 0;
}
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 1dee40477727..1426d595fab7 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -1766,7 +1766,7 @@ static int ext4_fc_replay_add_range(struct super_block *sb,
if (ret == 0) {
/* Range is not mapped */
- path = ext4_find_extent(inode, cur, NULL, 0);
+ path = ext4_find_extent(inode, cur, path, 0);
if (IS_ERR(path))
goto out;
memset(&newex, 0, sizeof(newex));
@@ -1782,7 +1782,6 @@ static int ext4_fc_replay_add_range(struct super_block *sb,
up_write((&EXT4_I(inode)->i_data_sem));
if (IS_ERR(path))
goto out;
- ext4_free_ext_path(path);
goto next;
}
@@ -1830,6 +1829,7 @@ static int ext4_fc_replay_add_range(struct super_block *sb,
ext4_ext_replay_shrink_inode(inode, i_size_read(inode) >>
sb->s_blocksize_bits);
out:
+ ext4_free_ext_path(path);
iput(inode);
return 0;
}
@@ -1930,12 +1930,13 @@ static void ext4_fc_set_bitmaps_and_counters(struct super_block *sb)
break;
if (ret > 0) {
- path = ext4_find_extent(inode, map.m_lblk, NULL, 0);
+ path = ext4_find_extent(inode, map.m_lblk, path, 0);
if (!IS_ERR(path)) {
for (j = 0; j < path->p_depth; j++)
ext4_mb_mark_bb(inode->i_sb,
path[j].p_block, 1, true);
- ext4_free_ext_path(path);
+ } else {
+ path = NULL;
}
cur += ret;
ext4_mb_mark_bb(inode->i_sb, map.m_pblk,
@@ -1946,6 +1947,8 @@ static void ext4_fc_set_bitmaps_and_counters(struct super_block *sb)
}
iput(inode);
}
+
+ ext4_free_ext_path(path);
}
/*
--
2.39.2
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