ubifs_read_node_wbuf(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ubifs_read_node_wbuf 💅

okay bestie, gather round, because today we're diving into ubifs_read_node_wbuf — that's the kernel API function from the UBIFS gang, and honestly? she's kind of a big deal. no cap.

✨ SYNOPSIS ✨

int ubifs_read_node_wbuf (struct ubifs_wbuf *wbuf , void *buf , int type
, int len , int lnum , int offs );

like, look at her. six whole arguments. main character energy fr fr 🎀

🌸 ARGUMENTS 🌸

  • wbuf — the write-buffer we're checking for un-written data. yes queen, we gotta peek before we commit 💅
  • buf — the buffer we're reading into. it's giving destination, it's giving home 🫶
  • type — the node type. gotta know what we're dealing with ✨
  • len — the node length. numbers matter, bestie 🔥
  • lnum — logical eraseblock number. say it with me: logical eraseblock number 💜
  • offs — the offset within that logical eraseblock. precision, we love to see it ⭐

🦋 DESCRIPTION 🦋

so here's the vibe check: this function reads a node of known type and len, checks it, and stores it in buf. simple enough, right? 💖

but here's the plot twist — if the node partially or fully sits in the write-buffer, she takes the data from that buffer instead. otherwise? she goes straight to the flash media. two sources, one icon 💀✨

returns, and this part matters:

  • zero in case of success 🎉 slay
  • -EUCLEAN if the CRC mismatched 😭 (that's a real one, don't ignore her)
  • a negative error code in case of failure 🙈
no cap, if you see -EUCLEAN that CRC said "not today" and you should probably pay attention 🚨

👑 SEE ALSO 👑

kernel file ./fs/ubifs/io.c, plus the whole bestie group chat:

and that's the whole page, babe 🌈 this lil legend lives in ./fs/ubifs, dated October 2026, and she goes by ubifs_read_node_wbuf(9) — iykyk 💅💖🎀

📦 where this page comes from