linux-kernel - [PATCH 3/8] autofs - refactor super block info init

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Date:   Thu, 21 Sep 2023 15:03:45 +0800
From:   Ian Kent <raven@...maw.net>
To:     Al Viro <viro@...IV.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>
Cc:     autofs mailing list <autofs@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bill O'Donnell <billodo@...hat.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        David Howells <dhowells@...hat.com>
Subject: [PATCH 3/8] autofs - refactor super block info init

Move the allocation and initialisation of the super block
info struct to its own function.

Signed-off-by: Ian Kent <raven@...maw.net>
---
 fs/autofs/inode.c |   53 ++++++++++++++++++++++++++++-------------------------
 1 file changed, 28 insertions(+), 25 deletions(-)

diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index e279e275b0a5..992d6cb29707 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -171,11 +171,6 @@ static int parse_options(char *options,
 	root->i_uid = current_uid();
 	root->i_gid = current_gid();
 
-	sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
-	sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
-
-	sbi->pipefd = -1;
-
 	if (!options)
 		return 1;
 
@@ -248,41 +243,49 @@ static int parse_options(char *options,
 	return (sbi->pipefd < 0);
 }
 
-int autofs_fill_super(struct super_block *s, void *data, int silent)
+static struct autofs_sb_info *autofs_alloc_sbi(void)
 {
-	struct inode *root_inode;
-	struct dentry *root;
 	struct autofs_sb_info *sbi;
-	struct autofs_info *ino;
-	int pgrp = 0;
-	bool pgrp_set = false;
-	int ret = -EINVAL;
 
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
-		return -ENOMEM;
-	pr_debug("starting up, sbi = %p\n", sbi);
+		return NULL;
 
-	s->s_fs_info = sbi;
 	sbi->magic = AUTOFS_SBI_MAGIC;
-	sbi->pipefd = -1;
-	sbi->pipe = NULL;
-	sbi->exp_timeout = 0;
-	sbi->oz_pgrp = NULL;
-	sbi->sb = s;
-	sbi->version = 0;
-	sbi->sub_version = 0;
 	sbi->flags = AUTOFS_SBI_CATATONIC;
+	sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
+	sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
+	sbi->pipefd = -1;
+
 	set_autofs_type_indirect(&sbi->type);
-	sbi->min_proto = 0;
-	sbi->max_proto = 0;
 	mutex_init(&sbi->wq_mutex);
 	mutex_init(&sbi->pipe_mutex);
 	spin_lock_init(&sbi->fs_lock);
-	sbi->queues = NULL;
 	spin_lock_init(&sbi->lookup_lock);
 	INIT_LIST_HEAD(&sbi->active_list);
 	INIT_LIST_HEAD(&sbi->expiring_list);
+
+	return sbi;
+}
+
+int autofs_fill_super(struct super_block *s, void *data, int silent)
+{
+	struct inode *root_inode;
+	struct dentry *root;
+	struct autofs_sb_info *sbi;
+	struct autofs_info *ino;
+	int pgrp = 0;
+	bool pgrp_set = false;
+	int ret = -EINVAL;
+
+	sbi = autofs_alloc_sbi();
+	if (!sbi)
+		return -ENOMEM;
+
+	pr_debug("starting up, sbi = %p\n", sbi);
+
+	sbi->sb = s;
+	s->s_fs_info = sbi;
 	s->s_blocksize = 1024;
 	s->s_blocksize_bits = 10;
 	s->s_magic = AUTOFS_SUPER_MAGIC;