self_check_ec_hdr(9)

💜 self_check_ec_hdr — a Kernel API Manual moment (section 9, bestie)

okay so like, this is self_check_ec_hdr(9) from the Kernel API Manual, and it's basically the vibe-check function for erase counter headers. yes, that's a real thing and yes, it's iconic ✨

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🌸 NAME 🌸

self_check_ec_hdr — checks if an erase counter header is all right. that's it, that's the whole gig 🎀

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✨ SYNOPSIS ✨

int self_check_ec_hdr (const struct ubi_device *ubi , int pnum , const
       struct ubi_ec_hdr *ec_hdr );

like, look at her. three params, returns an int, no notes. she's serving main character energy and we respect it 💅

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🦋 ARGUMENTS 🦋

• ubi — the UBI device description object. your whole device, in object form. she's the context, the moment, the setting 🫶
• pnum — the physical eraseblock number that this here erase counter header belongs to. so like, which PEB are we talking about, bestie. gotta know.
• ec_hdr — the actual erase counter header you want checked. the star of the show. hand her over and let's see what's up 👑

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💖 DESCRIPTION 💖

so this function is lowkey a yes/no girlie. she returns zero if the erase counter header contains valid values, and -EINVAL if not.

that's the entire behaviour. zero = valid, -EINVAL = not valid. no in-between, no "maybe", no "it's complicated." periodt 💀

ngl this is a self_check_ function, so treat it like a diagnostic bestie — pair her with her sisters in SEE ALSO below when you're digging into UBI I/O stuff.

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🔥 SEE ALSO 🔥

the whole friend group lives in the kernel file ./drivers/mtd/ubi/io.c, and honestly the roster ate:

• ubi_io_read(9)
• ubi_io_write(9)
• do_sync_erase(9)
• torture_peb(9)
• nor_erase_prepare(9)
• ubi_io_sync_erase(9)
• ubi_io_is_bad(9)
• ubi_io_mark_bad(9)
• validate_ec_hdr(9)
• ubi_io_read_ec_hdr(9)
• ubi_io_write_ec_hdr(9)
• validate_vid_hdr(9)
• ubi_io_read_vid_hdr(9)
• ubi_io_write_vid_hdr(9)
• self_check_not_bad(9)
• self_check_peb_ec_hdr(9)
• self_check_vid_hdr(9)
• self_check_peb_vid_hdr(9)
• self_check_write(9)
• ubi_self_check_all_ff(9)

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and that's the page!! 💫 this little beauty comes to you from ./drivers/mtd/ubi, dated October 2026, in the Kernel API Manual — ok bye, go validate some headers bestie, mwah 🍓🧚💜