nanddev_isbad(9)

💅 nanddev_isbad(9) — kernel API manual, bestie edition 🎀

okay so this is nanddev_isbad(9) from the Kernel API Manual, and it's literally the vibe-check function for NAND blocks. one job. does it slay or is it bad. let's get into it ✨

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✨ NAME ✨

nanddev_isbad — check if a block is bad 🕵️‍♀️

like... is this block giving bad energy or not. that's the whole gig.

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🌸 SYNOPSIS 🌸

bool nanddev_isbad (struct nand_device *nand , const struct nand_pos *pos );

returns a bool, takes two args, no cap. that's it, that's the signature 💅

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🦋 ARGUMENTS 🦋

• nand — the NAND device, aka the main character of this whole situation 👑
• pos — a position pointing to the block we want to check. like, this block right here, the one under the little cursor 🎯

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⭐ RETURN ⭐

true if the block is bad, false otherwise.

fr fr, that's it. no secret third option, no "sometimes", no "depends on the weather". true = bad block 💀, false = we're so back 🌈.

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💖 SEE ALSO 💖

the kernel file lives at ./drivers/mtd/nand/core.c, and here's the whole friend group 🫶 — every single one of them:

• nand_check_erased_buf(9)
• nand_check_erased_ecc_chunk(9)
• nanddev_markbad(9)
• nanddev_isreserved(9)
• nanddev_erase(9)
• nanddev_mtd_erase(9)
• nanddev_mtd_max_bad_blocks(9)
• nanddev_get_ecc_engine(9)
• nanddev_put_ecc_engine(9)
• nanddev_find_ecc_configuration(9)
• nanddev_ecc_engine_init(9)
• nanddev_ecc_engine_cleanup(9)
• nanddev_init(9)
• nanddev_cleanup(9)

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ngl bestie, if you're checking one block you're probably about to check a lot of blocks. nanddev_isbad is the little "hey is this one okay" you sprinkle around. go read the see-also list, it's giving full ecosystem 🧚

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and that's the page!! 🍓 this one came from ./drivers/mtd/nand, dated October 2026 — mwah, ty for reading, ily, go check your bad blocks 💜✨