nilfs_palloc_delete_block(9)

💖 nilfs_palloc_delete_block(9) — the kernel API manual page, but make it make sense 🎀

okay so bestie, welcome to the Kernel API Manual entry for nilfs_palloc_delete_block(9). this is the one that yeets a block off the persistent allocator file ✨ it's a real function, it does real kernel things, and we're gonna go through it with the full spreadsheet energy it deserves 💅

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🌸 NAME 🌸

nilfs_palloc_delete_block — delete a block on the persistent allocator file. that's it, that's the whole vibe check. block? gone. deleted. not invited to the party. 🫶

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✨ SYNOPSIS ✨

int nilfs_palloc_delete_block (struct inode *inode , unsigned long
blkoff , struct nilfs_bh_assoc *prev , spinlock_t *lock );

four args, one int coming back at you. it's giving signature reveal 💖

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🦋 ARGUMENTS 🦋

• inode — the inode of the metadata file that's using this allocator. like, which file's business are we in. be nice to it.
• blkoff — block offset. literally the offset of the block. that's the address bestie, the coordinates 🗺️
• prev — a nilfs_bh_assoc struct pointing at the last used buffer. the most recent ex, if you will 😭
• lock — a spinlock_t spin lock protecting prev. do not skip the lock. the lock is the whole point, it's the bodyguard 🫶

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🔥 RETURN 🔥

0 on success 💖 — queen behaviour, no notes.

on failure you get one of these negative error codes, and ngl none of them are cute:

• -EIO — I/O error, and yes, that includes metadata corruption. the data is having a crisis. 💀
• -ENOENT — non-existent block. it's not here. never was. ghosted you.
• -ENOMEM — insufficient memory available. the machine is broke, emotionally and RAM-wise 😭

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🧚 SEE ALSO 🧚

the kernel file lives at ./fs/nilfs2/alloc.c, and honestly the whole friend group shows up here — every single one, no gatekeeping:

nilfs_palloc_groups_per_desc_block(9), nilfs_palloc_groups_count(9), nilfs_palloc_init_blockgroup(9), nilfs_palloc_group(9), nilfs_palloc_desc_blkoff(9), nilfs_palloc_bitmap_blkoff(9), nilfs_palloc_group_desc_nfrees(9), nilfs_palloc_group_desc_add_entries(9), nilfs_palloc_entry_blkoff(9), nilfs_palloc_desc_block_init(9), nilfs_palloc_get_desc_block(9), nilfs_palloc_get_bitmap_block(9), nilfs_palloc_delete_bitmap_block(9), nilfs_palloc_get_entry_block(9), nilfs_palloc_delete_entry_block(9), nilfs_palloc_group_desc_offset(9), nilfs_palloc_bitmap_offset(9), nilfs_palloc_entry_offset(9), nilfs_palloc_find_available_slot(9), nilfs_palloc_rest_groups_in_desc_block(9), nilfs_palloc_count_desc_blocks(9), nilfs_palloc_mdt_file_can_grow(9), nilfs_palloc_count_max_entries(9), nilfs_palloc_prepare_alloc_entry(9), nilfs_palloc_commit_alloc_entry(9), nilfs_palloc_commit_free_entry(9), nilfs_palloc_abort_alloc_entry(9), nilfs_palloc_prepare_free_entry(9), nilfs_palloc_abort_free_entry(9), nilfs_palloc_freev(9)

that's thirty of them. i counted. slay. 🌈

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okay that's the whole page, no crumbs left behind 🍓 this one's from ./fs/nilfs2, dated October 2026, and it's the nilfs_palloc_delete_block(9) page through and through — mwah, love u, go delete a block responsibly 💜👑