From: Ira Weiny <ira.weiny@intel.com>
To: Jan Kara <jack@suse.com>, linux-ext4@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Subject: ext2_set_link()->ext2_put_page() question
Date: Mon, 22 Mar 2021 17:49:48 -0700 [thread overview]
Message-ID: <20210323004948.GR3014244@iweiny-DESK2.sc.intel.com> (raw)
Jan,
Why does ext2_set_link() need to call ext2_put_page()?
I don't see any reason that we could not match up the ext2_put_page() calls
with the ext2_find_entry().
Similarly am I missing something by moving the ext2_put_page() out of
ext2_delete_entry()?
See below patch.
I'm in the process of changing the kmap() calls in ext2_[get|put]_page() into
kmap_local_page() and I noticed this imbalance. It does not really save me
anything because I need to pass the kaddr into these calls but IMO it makes the
code a bit easier to follow.
If you agree I will get a patch together to submit with the kmap_local_page()
patch.
Thanks,
Ira
17:29:44 > git di
diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index 14aa45316ad2..bd572cead638 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -449,7 +449,6 @@ void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
de->inode = cpu_to_le32(inode->i_ino);
ext2_set_de_type(de, inode);
err = ext2_commit_chunk(page, pos, len);
- ext2_put_page(page);
if (update_times)
dir->i_mtime = dir->i_ctime = current_time(dir);
EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
@@ -594,7 +593,6 @@ int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page )
EXT2_I(inode)->i_flags &= ~EXT2_BTREE_FL;
mark_inode_dirty(inode);
out:
- ext2_put_page(page);
return err;
}
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 3367384d344d..a841b00c6828 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -371,6 +371,7 @@ static int ext2_rename (struct user_namespace * mnt_userns,
goto out_dir;
}
ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
+ ext2_put_page(new_page);
new_inode->i_ctime = current_time(new_inode);
if (dir_de)
drop_nlink(new_inode);
@@ -391,12 +392,13 @@ static int ext2_rename (struct user_namespace * mnt_userns,
mark_inode_dirty(old_inode);
ext2_delete_entry (old_de, old_page);
+ ext2_put_page(old_page);
if (dir_de) {
if (old_dir != new_dir)
ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
- else
- ext2_put_page(dir_page);
+
+ ext2_put_page(dir_page);
inode_dec_link_count(old_dir);
}
return 0;
17:35:41 > git di
diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index 14aa45316ad2..bd572cead638 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -449,7 +449,6 @@ void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
de->inode = cpu_to_le32(inode->i_ino);
ext2_set_de_type(de, inode);
err = ext2_commit_chunk(page, pos, len);
- ext2_put_page(page);
if (update_times)
dir->i_mtime = dir->i_ctime = current_time(dir);
EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
@@ -594,7 +593,6 @@ int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page )
EXT2_I(inode)->i_flags &= ~EXT2_BTREE_FL;
mark_inode_dirty(inode);
out:
- ext2_put_page(page);
return err;
}
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 3367384d344d..7af9ab3f975e 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -294,6 +294,7 @@ static int ext2_unlink(struct inode * dir, struct dentry *dentry)
}
err = ext2_delete_entry (de, page);
+ ext2_put_page(page);
if (err)
goto out;
@@ -371,6 +372,7 @@ static int ext2_rename (struct user_namespace * mnt_userns,
goto out_dir;
}
ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
+ ext2_put_page(new_page);
new_inode->i_ctime = current_time(new_inode);
if (dir_de)
drop_nlink(new_inode);
@@ -391,12 +393,13 @@ static int ext2_rename (struct user_namespace * mnt_userns,
mark_inode_dirty(old_inode);
ext2_delete_entry (old_de, old_page);
+ ext2_put_page(old_page);
if (dir_de) {
if (old_dir != new_dir)
ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
- else
- ext2_put_page(dir_page);
+
+ ext2_put_page(dir_page);
inode_dec_link_count(old_dir);
}
return 0;
next reply other threads:[~2021-03-23 0:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 0:49 Ira Weiny [this message]
2021-03-25 14:54 ` ext2_set_link()->ext2_put_page() question Jan Kara
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