linux-ext4 - [PATCH 02/13] ext4: remove cantfind

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Message-ID: <20220830120411.2371968-3-yanaijie@huawei.com>
Date:   Tue, 30 Aug 2022 20:04:00 +0800
From:   Jason Yan <yanaijie@...wei.com>
To:     <tytso@....edu>, <adilger.kernel@...ger.ca>, <jack@...e.cz>,
        <ritesh.list@...il.com>, <lczerner@...hat.com>,
        <linux-ext4@...r.kernel.org>
CC:     Jason Yan <yanaijie@...wei.com>
Subject: [PATCH 02/13] ext4: remove cantfind_ext4 error handler

The 'cantfind_ext4' error handler is just a error msg print and then
goto failed_mount. This two level goto makes the code complex and not
easy to read. The only benefit is that is saves a little bit code.
However some branches can merge and some branches dot not even need it.
So do some refactor and remove it.

Signed-off-by: Jason Yan <yanaijie@...wei.com>
---
 fs/ext4/super.c | 29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 6126da867b26..7341340e3c98 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4373,8 +4373,12 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	es = (struct ext4_super_block *) (bh->b_data + offset);
 	sbi->s_es = es;
 	sb->s_magic = le16_to_cpu(es->s_magic);
-	if (sb->s_magic != EXT4_SUPER_MAGIC)
-		goto cantfind_ext4;
+	if (sb->s_magic != EXT4_SUPER_MAGIC) {
+		if (!silent)
+			ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
+		goto failed_mount;
+	}
+
 	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
 
 	/* Warn if metadata_csum and gdt_csum are both set. */
@@ -4387,8 +4391,7 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	if (!ext4_verify_csum_type(sb, es)) {
 		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
 			 "unknown checksum algorithm.");
-		silent = 1;
-		goto cantfind_ext4;
+		goto failed_mount;
 	}
 	ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
 				ext4_orphan_file_block_trigger);
@@ -4406,9 +4409,8 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	if (!ext4_superblock_csum_verify(sb, es)) {
 		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
 			 "invalid superblock checksum.  Run e2fsck?");
-		silent = 1;
 		ret = -EFSBADCRC;
-		goto cantfind_ext4;
+		goto failed_mount;
 	}
 
 	/* Precompute checksum seed for all metadata */
@@ -4798,8 +4800,11 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
 
 	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
-	if (sbi->s_inodes_per_block == 0)
-		goto cantfind_ext4;
+	if (sbi->s_inodes_per_block == 0 || (EXT4_BLOCKS_PER_GROUP(sb) == 0)) {
+		if (!silent)
+			ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
+		goto failed_mount;
+	}
 	if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
 	    sbi->s_inodes_per_group > blocksize * 8) {
 		ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
@@ -4896,9 +4901,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 		goto failed_mount;
 	}
 
-	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
-		goto cantfind_ext4;
-
 	/* check blocks count against device size */
 	blocks_count = sb_bdev_nr_blocks(sb);
 	if (blocks_count && ext4_blocks_count(es) > blocks_count) {
@@ -5408,11 +5410,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 
 	return 0;
 
-cantfind_ext4:
-	if (!silent)
-		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
-	goto failed_mount;
-
 failed_mount9:
 	ext4_release_orphan_info(sb);
 failed_mount8:
-- 
2.31.1