exfat_iomap_read_end_io(9)

💖 NAME 💖

okay bestie, welcome to exfat_iomap_read_end_io(9) from the Kernel API Manual — yes, we're in the kernel guts and honestly it's giving main character energy. ✨

exfat_iomap_read_end_io — the iomap read bio completion handler for exFAT, periodt.

✨ SYNOPSIS ✨

void exfat_iomap_read_end_io (struct bio *bio );

🫶 ARGUMENTS 🫶

• bio — the bio that has completed reading. It's done, it's back, and this handler is handling it. 🦋

🧚 DESCRIPTION 🧚

okay so here's the situation 😭 exfat_iomap_begin rounds up MAPPED extents to the block boundary of valid_size. That's the whole point: it ensures that any subsequent blocks are treated as IOMAP_UNWRITTEN, which is great, but it also causes the "straddle block" containing valid_size to be read from disk.

And that's where it gets real: the disk data beyond valid_size in this block is stale and must be zeroed to prevent data leakage.

⚠️ Real talk: stale data beyond valid_size in that block is a data leakage risk if it isn't zeroed. Zero it. No cap. 💀

👑 SEE ALSO 👑

• Kernel file ./fs/exfat/iomap.c — go peek at the source if you want the full lore. 🔥

mwah 💅 this page's source/version is ./fs/exfat, dated October 2026. stay hydrated and zero your stale bytes, bestie 🎀✨