iscsi_block_scsi_eh(9)

💅 iscsi_block_scsi_eh — a page from the Kernel API Manual

okay so bestie, welcome to iscsi_block_scsi_eh(9), which is genuinely one of those tiny functions that carries a lot of weight. She's got exactly one job and she does it, periodt. Let's get into it 🎀

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✨ NAME ✨

iscsi_block_scsi_eh — block scsi eh until session state has transistioned

(yes, that's the spelling in the original, and no, we are not fixing it — she's iconic as-is 💅)

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🌸 SYNOPSIS 🌸

int iscsi_block_scsi_eh (struct scsi_cmnd *cmd );

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🦋 ARGUMENTS 🦋

• cmd — the scsi cmd that got passed to the scsi eh handler. that's it, that's the whole argument list, we love a low-maintenance queen 🫶

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💖 DESCRIPTION 💖

here's the vibe check: if the session is down, this function is gonna sit there and wait. wait for what, you ask? two possibilities, and she's not picky:

• the recovery timer fires, or
• the session gets logged back in 🔥

and if the recovery timer is the thing that fires first, then FAST_IO_FAIL is what gets returned. lowkey important: the caller should pass this error value to the scsi eh. like, that's the whole point of handing it back, okay? don't just pocket it and walk away 😭

fr fr, FAST_IO_FAIL is the message — deliver it to the scsi eh handler like it's a group chat screenshot that NEEDS to be seen 💀

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👑 SEE ALSO 👑

the kernel file we're living in: ./drivers/scsi/scsi_transport_iscsi.c

and the whole friend group, in the order they appear:

• iscsi_lookup_endpoint(9)
• iscsi_create_flashnode_sess(9)
• iscsi_create_flashnode_conn(9)
• iscsi_is_flashnode_conn_dev(9)
• iscsi_get_flashnode_by_index(9)
• iscsi_find_flashnode_sess(9)
• iscsi_find_flashnode_conn(9)
• iscsi_destroy_flashnode_sess(9)
• iscsi_destroy_all_flashnode(9)
• iscsi_bsg_host_dispatch(9)
• iscsi_bsg_host_add(9)
• iscsi_unblock_session(9)
• iscsi_force_destroy_session(9)
• iscsi_alloc_conn(9)
• iscsi_add_conn(9)
• iscsi_remove_conn(9)
• iscsi_session_event(9)

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and that's the page!! 🧚 this gorgeous little number lives over in ./drivers/scsi, dated October 2026, and it answers to the name iscsi_block_scsi_eh(9) — go say hi, she's been waiting for you bestie 💜✨🎀