ext4: factor out ext4_geometry_check()

Factor out ext4_geometry_check(). No functional change.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20220916141527.1012715-11-yanaijie@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 61 insertions, 50 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 972e287160c8..ee0ca696c05f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4660,6 +4660,66 @@ static int ext4_check_feature_compatibility(struct super_block *sb,
 	return 0;
 }
 
+static int ext4_geometry_check(struct super_block *sb,
+			       struct ext4_super_block *es)
+{
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
+	__u64 blocks_count;
+
+	/* check blocks count against device size */
+	blocks_count = sb_bdev_nr_blocks(sb);
+	if (blocks_count && ext4_blocks_count(es) > blocks_count) {
+		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
+		       "exceeds size of device (%llu blocks)",
+		       ext4_blocks_count(es), blocks_count);
+		return -EINVAL;
+	}
+
+	/*
+	 * It makes no sense for the first data block to be beyond the end
+	 * of the filesystem.
+	 */
+	if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
+		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
+			 "block %u is beyond end of filesystem (%llu)",
+			 le32_to_cpu(es->s_first_data_block),
+			 ext4_blocks_count(es));
+		return -EINVAL;
+	}
+	if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
+	    (sbi->s_cluster_ratio == 1)) {
+		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
+			 "block is 0 with a 1k block and cluster size");
+		return -EINVAL;
+	}
+
+	blocks_count = (ext4_blocks_count(es) -
+			le32_to_cpu(es->s_first_data_block) +
+			EXT4_BLOCKS_PER_GROUP(sb) - 1);
+	do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
+	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
+		ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
+		       "(block count %llu, first data block %u, "
+		       "blocks per group %lu)", blocks_count,
+		       ext4_blocks_count(es),
+		       le32_to_cpu(es->s_first_data_block),
+		       EXT4_BLOCKS_PER_GROUP(sb));
+		return -EINVAL;
+	}
+	sbi->s_groups_count = blocks_count;
+	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
+			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
+	if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
+	    le32_to_cpu(es->s_inodes_count)) {
+		ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
+			 le32_to_cpu(es->s_inodes_count),
+			 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 {
 	struct buffer_head *bh, **group_desc;
@@ -4675,7 +4735,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	unsigned int db_count;
 	unsigned int i;
 	int needs_recovery, has_huge_files;
-	__u64 blocks_count;
 	int err = 0;
 	ext4_group_t first_not_zeroed;
 	struct ext4_fs_context *ctx = fc->fs_private;
@@ -4964,57 +5023,9 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 		goto failed_mount;
 	}
 
-	/* check blocks count against device size */
-	blocks_count = sb_bdev_nr_blocks(sb);
-	if (blocks_count && ext4_blocks_count(es) > blocks_count) {
-		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
-		       "exceeds size of device (%llu blocks)",
-		       ext4_blocks_count(es), blocks_count);
+	if (ext4_geometry_check(sb, es))
 		goto failed_mount;
-	}
 
-	/*
-	 * It makes no sense for the first data block to be beyond the end
-	 * of the filesystem.
-	 */
-	if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
-		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
-			 "block %u is beyond end of filesystem (%llu)",
-			 le32_to_cpu(es->s_first_data_block),
-			 ext4_blocks_count(es));
-		goto failed_mount;
-	}
-	if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
-	    (sbi->s_cluster_ratio == 1)) {
-		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
-			 "block is 0 with a 1k block and cluster size");
-		goto failed_mount;
-	}
-
-	blocks_count = (ext4_blocks_count(es) -
-			le32_to_cpu(es->s_first_data_block) +
-			EXT4_BLOCKS_PER_GROUP(sb) - 1);
-	do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
-	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
-		ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
-		       "(block count %llu, first data block %u, "
-		       "blocks per group %lu)", blocks_count,
-		       ext4_blocks_count(es),
-		       le32_to_cpu(es->s_first_data_block),
-		       EXT4_BLOCKS_PER_GROUP(sb));
-		goto failed_mount;
-	}
-	sbi->s_groups_count = blocks_count;
-	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
-			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
-	if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
-	    le32_to_cpu(es->s_inodes_count)) {
-		ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
-			 le32_to_cpu(es->s_inodes_count),
-			 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
-		ret = -EINVAL;
-		goto failed_mount;
-	}
 	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
 		   EXT4_DESC_PER_BLOCK(sb);
 	if (ext4_has_feature_meta_bg(sb)) {