fixup_leb(9)

💅 fixup_leb(9) — the LEB glow-up page

okay so this is from the Kernel API Manual, and bestie, we're about to make flash storage look immaculate. 🎀

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✨ NAME ✨

fixup_leb — fixup/unmap an LEB containing free space. that's the whole vibe. 🦋

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🌸 SYNOPSIS 🌸

int fixup_leb (struct ubifs_info *c , int lnum , int len );

literally the entire function signature, no notes. 💅

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🎀 ARGUMENTS 🎀

• c — the UBIFS file-system description object. the main character, honestly. 👑
• lnum — the LEB number to fix up. yes that LEB. 🌈
• len — number of used bytes in LEB (starting at offset 0). count carefully bestie, it starts at offset zero. ⭐

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💖 DESCRIPTION 💖

so the way this works: fixup_leb reads the contents of the given LEB number lnum, then fixes it up — so that empty min. I/O units in the end of LEB are actually erased on flash (rather than being just all-0xff real data). 🫶

and if the LEB is completely empty? it is simply unmapped. no drama, no leftovers, periodt. 💀

lowkey iconic behaviour ngl — min. I/O units at the tail get properly erased on flash instead of just pretending to be erased by sitting there as all-0xff real data. and a totally empty LEB gets unmapped, just like that. 🙈

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🧚 SEE ALSO 🧚

Kernel file ./fs/ubifs/sb.c — go read these next, iykyk:

• create_default_filesystem(9)
• validate_sb(9)
• ubifs_read_sb_node(9)
• ubifs_write_sb_node(9)
• ubifs_read_superblock(9)
• fixup_free_space(9)
• ubifs_fixup_free_space(9)

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and that's the page!! 🌸 this one lives in ./fs/ubifs, dated October 2026, and it's fixup_leb(9) — mwah, slay, go fix up some LEBs 💜🔥