scsi_host_block(9)

✨ scsi_host_block — from the Kernel API Manual, bestie ✨

Okay so real talk, this one's from the Kernel API Manual and it's honestly such a mood. Let's get into it 🫶

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🎀 NAME 🎀

scsi_host_block — the "try to transition all logical units to the SDEV_BLOCK state" girlie 💅

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✨ SYNOPSIS ✨

int scsi_host_block (struct Scsi_Host *shost );

That's it. That's the whole entrance. Main character energy, zero notes. 👑

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🌸 ARGUMENTS 🌸

• shost — the device you wanna block. That's the one. Give her the vibe check 💖

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💜 DESCRIPTION 💜

So what she does is pause SCSI command processing for all the logical units hanging out with that SCSI host, and then she waits until the pending scsi_queue_rq calls have finished. Like, actually finished. No cutting the line, no "almost done" — she waits fr fr 😤✨

She returns zero if everything slays, or a negative error code if it does not slay. No cap.

Heads up: zero = success, negative = failure. That's the whole returns situation, don't overthink it 🦋

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🌈 SEE ALSO 🌈

Kernel file ./drivers/scsi/scsi_lib.c and honestly her whole friend group — like, the entire group chat showed up:

• __scsi_queue_insert(9)
• scsi_queue_insert(9)
• scsi_failures_reset_retries(9)
• scsi_check_passthrough(9)
• scsi_execute_cmd(9)
• scsi_run_queue(9)
• scsi_result_to_blk_status(9)
• scsi_rq_err_bytes(9)
• scsi_io_completion(9)
• scsi_alloc_sgtables(9)
• scsi_initialize_rq(9)
• scsi_alloc_request(9)
• scsi_dispatch_cmd(9)
• scsi_get_internal_cmd(9)
• scsi_put_internal_cmd(9)
• scsi_device_from_queue(9)
• scsi_block_requests(9)
• scsi_unblock_requests(9)
• scsi_mode_select(9)
• scsi_mode_sense(9)
• scsi_test_unit_ready(9)
• scsi_device_set_state(9)
• scsi_evt_emit(9)
• scsi_evt_thread(9)
• sdev_evt_send(9)
• sdev_evt_alloc(9)
• sdev_evt_send_simple(9)
• scsi_device_quiesce(9)
• scsi_device_resume(9)
• scsi_internal_device_block_nowait(9)
• scsi_device_block(9)
• scsi_internal_device_unblock_nowait(9)
• scsi_internal_device_unblock(9)
• scsi_block_targets(9)
• scsi_kmap_atomic_sg(9)
• scsi_kunmap_atomic_sg(9)
• scsi_vpd_lun_id(9)
• scsi_vpd_lun_serial(9)
• scsi_vpd_tpg_id(9)
• scsi_build_sense(9)

Like, forty of them. Iconic. Obsessed. 🍓

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🧚 the little sign-off 🧚

Brought to you by <pink>./drivers/scsi</pink> 💖, dated October 2026 ⭐, and yes it lives under scsi_host_block(9) in case you forgot where you came from 😭🫶

Bye bestie, go block those logical units responsibly 💅✨