ext2_bg_has_super(9)

✨ ext2_bg_has_super(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 this little cutie is called ext2_bg_has_super(9) and she's here to answer one (1) very specific question for you. let's get into it 🎀

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🌸 NAME 🌸

ext2_bg_has_super — literally just tells you the number of blocks used by the superblock in a group 🦋

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⭐ SYNOPSIS ⭐

int ext2_bg_has_super (struct super_block *sb , int group );

like, that's the whole signature. short and iconic, no notes 👑

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💖 ARGUMENTS 💖

• sb — the superblock for the filesystem, aka the main character of this whole situation 🌈
• group — the group number you wanna check. yes, that group. the one you're curious about 🧚

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🦋 DESCRIPTION 🦋

so here's the vibe: this function returns the number of blocks used by the superblock (whether that's the primary one or a backup, both count) inside this group 💫

and rn? currently this will be only 0 or 1. that's it. that's the range. no cap 😭

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👑 SEE ALSO 👑

if you're obsessed with this one (and honestly why wouldn't you be), go check out these besties too. they all live in the kernel file ./fs/ext2/balloc.c 🍓:

• __rsv_window_dump(9)
• goal_in_my_reservation(9)
• search_reserve_window(9)
• rsv_window_remove(9)
• ext2_init_block_alloc_info(9)
• ext2_discard_reservation(9)
• ext2_free_blocks(9)
• bitmap_search_next_usable_block(9)
• find_next_usable_block(9)
• ext2_try_to_allocate(9)
• find_next_reservable_window(9)
• alloc_new_reservation(9)
• try_to_extend_reservation(9)
• ext2_try_to_allocate_with_rsv(9)
• ext2_has_free_blocks(9)
• ext2_bg_num_gdb(9)

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💀 reminder bestie: the return value is literally just 0 or 1 for now, so don't go expecting a big dramatic number, ok? 🙈

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and that's the whole page, babes 🫶 this lil masterpiece comes from ./fs/ext2, dated October 2026, and it's filed under ext2_bg_has_super(9) — slay, periodt, go read some more kernel docs 💜✨