ubifs_jnl_write_data(9)

✨ ubifs_jnl_write_data ✨

okay bestie, welcome to the ubifs_jnl_write_data(9) page 🌸 this one lives in the Kernel API Manual and it's literally the whole vibe of "write a data node to the journal" — no cap. come sit with me, it's short and sweet and we're gonna get through it together 💖

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🌈 SYNOPSIS 🌈

int ubifs_jnl_write_data (struct ubifs_info *c , const struct inode
*inode , const union ubifs_key *key , struct folio *folio , size_t
offset , int len );

that's the whole signature, periodt. don't tweak a character of it 🫶

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🎀 ARGUMENTS 🎀

• c — the UBIFS file-system description object. it's giving "the whole filesystem in one struct" energy ✨
• inode — the inode that this data node belongs to (yes, that inode 💅)
• key — the node key 🔑
• folio — the buffer we're writing from 🦋
• offset — where in the buffer we're writing at
• len — the data length. and listen, important: it must not exceed UBIFS_BLOCK_SIZE ⚠️ like, that's a hard vibe check, respect it 😭

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💜 DESCRIPTION 💜

so what does it actually do? This function writes a data node to the journal 📝 that's it, that's the whole job, and honestly she ate.

It returns 0 if the data node was successfully written 🎉 and a negative error code if something went wrong 💀 (iykyk — negative means bad news, bestie).

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🦋 SEE ALSO 🦋

Kernel file ./fs/ubifs/journal.c — and like, the whole extended friend group of functions:

zero_ino_node_unused(9), zero_dent_node_unused(9), zero_trun_node_unused(9), reserve_space(9), write_head(9), __queue_and_wait(9), wait_for_reservation(9), wake_up_reservation(9), add_or_start_queue(9), make_reservation(9), release_head(9), finish_reservation(9), get_dent_type(9), pack_inode(9), mark_inode_clean(9), ubifs_jnl_update(9), ubifs_jnl_write_inode(9), ubifs_jnl_delete_inode(9), ubifs_jnl_xrename(9), ubifs_jnl_rename(9), truncate_data_node(9), ubifs_jnl_truncate(9), ubifs_jnl_delete_xattr(9), ubifs_jnl_change_xattr(9)

all of them, none skipped, we don't do gatekeeping here 👑

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and that's the page, diva 💅 if you ever forget len must not exceed UBIFS_BLOCK_SIZE, I will personally appear in your kernel logs 🙈

this lil masterpiece comes from the source/version ./fs/ubifs, dated October 2026 🎀 slay, see you in the next manpage bestie 🌸✨