ext4_has_free_clusters(9)

✨ NAME ✨

okay so this is the ext4_has_free_clusters(9) page from the Kernel API Manual, bestie 🫶. The NAME line is literally ext4_has_free_clusters - and then it just ends — no extra description after the dash, no cap 🙈💅.

💅 SYNOPSIS 💅

exact signature, character-for-character, because we respect the source:

int ext4_has_free_clusters (struct ext4_sb_info *sbi , s64 nclusters ,
       unsigned int flags );

🎀 ARGUMENTS 🎀

• sbi — the in-core super block structure. main-character data situation, lowkey 💖
• nclusters — number of needed blocks. yes bestie, the arg is named clusters but the description says blocks — we're just reporting the lore 🫶
• flags — flags from ext4_mb_new_blocks. periodt ✨

🌸 DESCRIPTION 🌸

Check if filesystem has nclusters free & available for allocation. that's the vibe check 🔥.

On success return 1, return 0 on failure. so: success -> 1, failure -> 0 — that's the whole return-value saga 💀✨.

🦋 SEE ALSO 🦋

the kernel file is ./fs/ext4/balloc.c, and the whole friend group is:

• ext4_get_group_desc(9)
• ext4_read_block_bitmap_nowait(9)
• ext4_should_retry_alloc(9)
• ext4_count_free_clusters(9)
• ext4_bg_has_super(9)
• ext4_bg_num_gdb(9)
• ext4_inode_to_goal_block(9)

made with 💖 from the ./fs/ext4 source tree, October 2026 vintage, and this manual page is ext4_has_free_clusters(9) — bye bestie, go check those free clusters 🧚💜