diag_trigger_scsi_store(9)

💅 diag_trigger_scsi_store(9) 💅

okay so first things first, bestie: this is a page from the Kernel API Manual (yes, the section 9 girlies, kernel internals only, we don't do userland here 💖). It's about one tiny little sysfs store function that lives way deep in the SCSI/mpt3sas woods, and honestly? she's lowkey iconic for how much lore sits around her.

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✨ NAME ✨

diag_trigger_scsi_store — the girl who stores the diag_trigger_scsi attribute. that's it. that's the whole job. store it. periodt. 🎀

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🌸 SYNOPSIS 🌸

ssize_t diag_trigger_scsi_store (struct device *cdev , struct device_attribute *attr , const char *buf , size_t count );

like, look at her. ssize_t return, four args, no notes. 💅

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🦋 ARGUMENTS 🦋

• cdev — pointer to embedded class device. that's the device she's attached to, okurr 💖
• attr — ? … yeah babe the docs genuinely just say ? here 😭 the original authors left us on read, so I'm not gonna invent lore that isn't there. we respect the mystery 🙈
• buf — the buffer returned. that's the thing getting stored, bestie ⭐
• count — ? … again with the ? 💀 count is a mystery in the source docs and I refuse to make up technical claims. we simply do not know. and that's fine!! 🫶

ngl the two ?s are sending me, but rule number one around here is facts stay facts, so the ?s stay ?s. no cap. 🔥

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🌈 DESCRIPTION 🌈

A sysfs 'read/write' shost attribute.

that's the whole description. she's short, she's sweet, she's a sysfs 'read/write' shost attribute and she said what she said 👑 like yes, it's a real thing, it's got both read and write energy, and it belongs to the shost. main character attribute behavior fr fr 💅✨

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🧚 SEE ALSO 🧚

bestie. buckle up. the SEE ALSO section on this page is unhinged in the best way — it's basically the entire mpt3sas extended family showing up to the group chat at once 🫶 the kernel file is ./drivers/scsi/mpt3sas/mpt3sas_ctl.c, and here's every single one of her friends, in order, no one left behind:

• enum block_state(9), _ctl_display_some_debug(9), mpt3sas_ctl_done(9), _ctl_check_event_type(9), mpt3sas_ctl_add_to_event_log(9), mpt3sas_ctl_event_callback(9), _ctl_verify_adapter(9), mpt3sas_ctl_pre_reset_handler(9), mpt3sas_ctl_clear_outstanding_ioctls(9), mpt3sas_ctl_reset_done_handler(9), _ctl_fasync(9), _ctl_poll(9), _ctl_set_task_mid(9), _ctl_send_mctp_passthru_req(9), _ctl_do_mpt_command(9), _ctl_getiocinfo(9), _ctl_eventquery(9), _ctl_eventenable(9), _ctl_eventreport(9), _ctl_do_reset(9), _ctl_btdh_search_sas_device(9), _ctl_btdh_search_pcie_device(9), _ctl_btdh_search_raid_device(9), _ctl_btdh_mapping(9), _ctl_diag_capability(9), _ctl_diag_get_bufftype(9), _ctl_diag_register_2(9), mpt3sas_enable_diag_buffer(9), _ctl_diag_register(9), _ctl_diag_unregister(9), _ctl_diag_query(9), mpt3sas_send_diag_release(9), _ctl_diag_release(9), _ctl_diag_read_buffer(9), _ctl_addnl_diag_query(9), _ctl_enable_diag_sbr_reload(9), _ctl_compat_mpt_command(9), _ctl_ioctl_main(9), _ctl_get_mpt_mctp_passthru_adapter(9), mpt3sas_get_device_count(9), _ctl_ioctl(9), _ctl_mpt2_ioctl(9), _ctl_ioctl_compat(9), _ctl_mpt2_ioctl_compat(9), version_fw_show(9), version_bios_show(9), version_mpi_show(9), version_product_show(9), version_nvdata_persistent_show(9), version_nvdata_default_show(9), board_name_show(9), board_assembly_show(9), board_tracer_show(9), io_delay_show(9), device_delay_show(9), fw_queue_depth_show(9), host_sas_address_show(9), logging_level_show(9), fwfault_debug_show(9), ioc_reset_count_show(9), reply_queue_count_show(9), BRM_status_show(9), host_trace_buffer_size_show(9), host_trace_buffer_show(9), host_trace_buffer_enable_show(9), diag_trigger_master_show(9), diag_trigger_master_store(9), diag_trigger_event_show(9), diag_trigger_event_store(9), diag_trigger_scsi_show(9), diag_trigger_mpi_show(9), diag_trigger_mpi_store(9), drv_support_bitmap_show(9), enable_sdev_max_qd_show(9), enable_sdev_max_qd_store(9), sas_address_show(9), sas_device_handle_show(9), sas_ncq_prio_supported_show(9), sas_ncq_prio_enable_show(9), mpt3sas_ctl_init(9), mpt3sas_ctl_release(9), mpt3sas_ctl_exit(9)

like… seventy-plus besties. it's giving family reunion 🎉 and yes, her sister pages diag_trigger_scsi_show(9), diag_trigger_mpi_show(9) and diag_trigger_mpi_store(9) are right there in the mix, iykyk 💜

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quick vibe check 🎀: the two ? arguments and the one-line DESCRIPTION are exactly what the original gives us — nothing more, nothing invented. we keep every detail, we just made it cute.

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okay that's the page!! mwah 💋 this little writeup came to you straight out of ./drivers/scsi/mpt3sas, dated October 2026 — go drink some water and go touch a kernel module, bestie 🫶✨🌸