handle_allocation_error(9)

🌸 handle_allocation_error(9) — Kernel API Manual 🌸

okay so bestie, welcome to the handle_allocation_error(9) page from the Kernel API Manual. this is literally the glow-up guide for when block allocation goes wrong and we need to handle it. no cap, it's giving "oops, no blocks for you" energy, but make it graceful. 💅

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✨ NAME ✨

handle_allocation_error — Handle an error attempting to allocate a block.

like, this is the function that catches the L when a block allocation fails. it's the designated error-handler bestie, and it's here to make sure things don't spiral. 🫶

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🦋 SYNOPSIS 🦋

okay so the synopsis is literally this, no cap:

void handle_allocation_error (struct vdo_completion *completion );

that's the whole vibe. it takes one arg and returns nothing (void, so it's not giving you anything back, it's just doing the work). 💖

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🎀 ARGUMENTS 🎀

• completion — this is the data_vio. yeah, that's it. no extra deets, it's just the data_vio. don't overthink it, bestie. 💅

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🧚 DESCRIPTION 🧚

okay so listen: this error handler? it's registered in continue_write_with_block_map_slot. that's the whole thing. it's literally the designated handler for allocation errors, and it gets called from that spot. periodt. 💀

like, if you're in continue_write_with_block_map_slot and an allocation fails, this is the function that steps in to handle it. it's the main character energy of error handling, fr fr. 🔥

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🌈 SEE ALSO 🌈

alright bestie, here's the whole squad of other manpages you might wanna check out. these are all the related functions and files, no cap:

• Kernel file ./drivers/md/dm-vdo/data-vio.c
• Bio flags.(9)
• Introduction(9)
• check_for_drain_complete_locked(9)
• pack_status(9)
• set_data_vio_compression_status(9)
• cancel_data_vio_compression(9)
• attempt_logical_block_lock(9)
• launch_data_vio(9)
• schedule_releases(9)
• process_release_callback(9)
• initialize_data_vio(9)
• make_data_vio_pool(9)
• free_data_vio_pool(9)
• vdo_launch_bio(9)
• drain_data_vio_pool(9)
• resume_data_vio_pool(9)
• dump_data_vio_pool(9)
• release_allocated_lock(9)
• release_logical_lock(9)
• finish_cleanup(9)
• get_data_vio_operation_name(9)
• data_vio_allocate_data_block(9)
• release_data_vio_allocation_lock(9)
• uncompress_data_vio(9)
• modify_for_partial_write(9)
• read_block(9)
• update_block_map(9)
• read_old_block_mapping(9)
• pack_compressed_data(9)
• compress_data_vio(9)
• launch_compress_data_vio(9)
• hash_data_vio(9)
• write_bio_finished(9)
• acknowledge_write_callback(9)
• allocate_block(9)
• continue_data_vio_with_block_map_slot(9)

like, that's a whole friend group. go check 'em out if you need more context. iykyk. 👑

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and that's the page, bestie! this masterpiece was served to you from ./drivers/md/dm-vdo, version October 2026. handle it with care. 💖✨🌈🍓