scsi_mode_select(9)

💅 NAME 💅

scsi_mode_select — issue a mode select. And yes bestie, this is straight from the Kernel API Manual, so we’re officially in kernel API land now ✨.

✨ SYNOPSIS ✨

Okay so here’s the exact signature — copy it carefully and do not let autocorrect touch it:

int scsi_mode_select (struct scsi_device *sdev , int pf , int sp ,
       unsigned char *buffer , int len , int timeout , int retries , struct
       scsi_mode_data *data , struct scsi_sense_hdr *sshdr );

🎀 ARGUMENTS 🎀

• sdev — the SCSI device to be queried. That’s the main character here 💖.
• pf — page format bit: 1 == standard, 0 == vendor specific.
• sp — save page bit: 0 == don't save, 1 == save.
• buffer — request buffer. Important: it may not be smaller than eight bytes, periodt.
• len — length of request buffer.
• timeout — command timeout.
• retries — number of retries before failing.
• data — returns a structure abstracting the mode header data.
• sshdr — place to put sense data (or NULL if no sense to be collected). It must be SCSI_SENSE_BUFFERSIZE big.

🌸 DESCRIPTION 🌸

The return vibe check is the whole description here: returns zero if successful; negative error number or scsi status on error. That’s it, icon — no extra lore, no secret side quest 😭.

🦋 SEE ALSO 🦋

Kernel file ./drivers/scsi/scsi_lib.c — that’s the source-file moment. And then the whole squad:

• __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_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_host_block(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)

With love and zero panic, your kernel bestie 💖 — source/version ./drivers/scsi, dated October 2026, and we were just reading scsi_mode_select(9) the whole time 🫶.