dasd_biodasdinfo(9)

💅 dasd_biodasdinfo(9) — the kernel API manual, but make it cute

okay bestie, so this one's a kernel API manual page, dasd_biodasdinfo(9), and it's genuinely iconic in a "small but mighty" way. it fills out the dasd information structure. that's it. that's the whole vibe. let's get into it 🫶

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✨ NAME ✨

dasd_biodasdinfo — fill out the dasd information structure

like, literally just do the thing. fill the struct. slay. 💅

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🦋 SYNOPSIS 🦋

int dasd_biodasdinfo (struct gendisk *disk , struct dasd_information2_t
*info );

yes the space before the comma is in the original, i'm not fixing it, it's part of the charm 💀

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🌸 ARGUMENTS 🌸

• disk — [in] pointer to a gendisk structure that references a DASD. this is the main character of the operation, and the function is gonna vibe check it real hard (more on that in a sec) 👑
• info — [out] pointer to the dasd_information2_t structure. this is where all the good stuff lands. it's the output bestie, it gets written to. 🎀

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🧚 DESCRIPTION 🧚

okay so here's the whole plot: this function provides access to DASD-specific information. that's the gift. that's the serve. ✨

but first — before anything gets filled in — it does a little identity check. it looks at the gendisk structure and asks "bestie, are you part of the DASD driver?" and it figures that out by comparing the gendisk->fops pointer. that's the whole test. no cap, just a pointer comparison. 🔥

if it does not belong to the DASD driver, the function returns -EINVAL. not sorry. gatekeeping is a form of self-care. 🙈

otherwise — meaning the gendisk did pass the vibe check — the provided dasd_information2_t structure gets filled out. and that's the whole gig. iconic. periodt. 👑

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💖 RETURN 💖

• 0 on success — we love a clean win ⭐
• a negative error value on failure — she's not mad, she's just disappointed 😭

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/s390/block/dasd_ioctl.c — go read it if you want the full lore, iykyk 🦋

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that's the whole page, bestie. short, sweet, and it ate. go forth and check those fops pointers. 🧚✨

— cute little sign-off: this page lives in the <bold>./drivers/s390/block</bold> neighborhood, and it was last touched in <bold>October 2026</bold>. mwah. 💜