pack_fragment(9)

💅 pack_fragment(9) — a Kernel API Manual moment 🎀

okay so bestie, this is the Kernel API Manual page for pack_fragment(9), and lowkey it's iconic. not me being obsessed with a packing function, but here we are. this one packs a data_vio's fragment into the compressed block where it's already known to fit. vibe check: it fits, periodt. ✨

🌸 NAME 🌸

pack_fragment — pack a data_vio's fragment into the compressed block in which it is already known to fit. that's the whole name, fr fr. 💅

✨ SYNOPSIS ✨

block_size_t pack_fragment (struct compression_state *compression ,
struct data_vio *data_vio , block_size_t offset , slot_number_t slot ,
struct compressed_block *block );

🎀 ARGUMENTS 🎀

• compression — the agent's compression_state to pack in to. 🫶
• data_vio — the data_vio to pack. literally the main character here. ⭐
• offset — the offset into the compressed block at which to pack the fragment. 📍
• slot — the slot number in the compressed block. 🔢
• block — the compressed block which will be written out when batch is fully packed. 💖

💖 RETURN 💖

the new amount of space used. that's it, that's the return. no cap. 🫶

🦋 SEE ALSO 🦋

go read these next, iykyk:

• Kernel file ./drivers/md/dm-vdo/packer.c
• vdo_get_compressed_block_fragment(9)
• assert_on_packer_thread(9)
• insert_in_sorted_list(9)
• make_bin(9)
• vdo_make_packer(9)
• vdo_free_packer(9)
• get_packer_from_data_vio(9)
• vdo_get_packer_statistics(9)
• abort_packing(9)
• release_compressed_write_waiter(9)
• finish_compressed_write(9)
• add_to_bin(9)
• remove_from_bin(9)
• initialize_compressed_block(9)
• compressed_write_end_io(9)
• write_bin(9)
• add_data_vio_to_packer_bin(9)
• select_bin(9)
• vdo_attempt_packing(9)
• check_for_drain_complete(9)
• write_all_non_empty_bins(9)
• vdo_flush_packer(9)
• vdo_remove_lock_holder_from_packer(9)
• vdo_increment_packer_flush_generation(9)
• vdo_drain_packer(9)
• vdo_resume_packer(9)
• vdo_dump_packer(9)

cute sign-off time, bestie: this page came from the ./drivers/md/dm-vdo source/version and is dated October 2026. 🫶✨💅