ext4_bg_has_super(9)

okay bestie, welcome to the ext4_bg_has_super(9) page from the Kernel API Manual 💖 this one is short, sweet, and extremely on-brand.

💖 NAME 💖

ext4_bg_has_super — number of blocks used by the superblock in group

🌸 SYNOPSIS 🌸

int ext4_bg_has_super (struct super_block *sb , ext4_group_t group );

🎀 ARGUMENTS 🎀

• sb — superblock for filesystem
• group — group number to check

💅 DESCRIPTION 💅

okay so this function returns the number of blocks used by the superblock — primary or backup — in this group. that’s the whole vibe.

Currently this will be only <yellow>0</yellow> or <yellow>1</yellow> 👑 no cap.

🦋 SEE ALSO 🦋

Kernel file ./fs/ext4/balloc.c is right there in the mix, plus these iconic little references:

• ext4_get_group_desc(9)
• ext4_read_block_bitmap_nowait(9)
• ext4_has_free_clusters(9)
• ext4_should_retry_alloc(9)
• ext4_count_free_clusters(9)
• ext4_bg_num_gdb(9)
• ext4_inode_to_goal_block(9)

mwah 💋 this page lives in ./fs/ext4, dated October 2026, and it’s literally the ext4_bg_has_super(9) man page. bye bestie 🫶