ubifs_wbuf_write_nolock(9)

💅 ubifs_wbuf_write_nolock(9) — or, "how to yeet a node into flash (eventually)" 🦋

okay so bestie, this one's from the Kernel API Manual and it's literally all about writing data to flash via the write-buffer. think of it as the group chat of kernel functions — sometimes messages get delivered right away, sometimes they sit there until someone finally checks their phone. periodt. 💖

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✨ SYNOPSIS ✨

int ubifs_wbuf_write_nolock (struct ubifs_wbuf *wbuf , void *buf , int
len );

like, that's the whole vibe. no cap. 🎀

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🌸 ARGUMENTS 🌸

• wbuf — the write-buffer itself. the main character. 👑
• buf — the node you wanna write. it's giving "payload energy." 💜
• len — how long that node is, length-wise. the way that we need this number. 🔥

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💀 DESCRIPTION 💀

okay so here's the tea: this function writes data to flash via write-buffer wbuf. and like, that's not always instant — here's the part where you gotta pay attention. ✨

the last piece of the node won't reach the flash media immediately if it does not take whole max. write unit (c->max_write_size).

so instead of sliding into flash right away, the node will lowkey sit in RAM until the write-buffer is synchronized — e.g., by timer, or because more data are appended to the write-buffer. it's just chilling there, waiting for its moment. 🙈 iykyk. 🌈

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🫶 RETURN VALUES 🫶

this function returns zero in case of success and a negative error code in case of failure. and listen — if the node cannot be written because there is no more space in this logical eraseblock, -ENOSPC is returned. so like, if you see that, the eraseblock is full fr fr. no more room. 💀

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🌟 SEE ALSO 🌟

Kernel file ./fs/ubifs/io.c and also literally the whole friend group, bestie: 🧚

ubifs_ro_mode(9), ubifs_check_node(9), ubifs_pad(9), next_sqnum(9), ubifs_prepare_node_hmac(9), ubifs_prepare_node(9), ubifs_prep_grp_node(9), wbuf_timer_callback_nolock(9), new_wbuf_timer_nolock(9), cancel_wbuf_timer_nolock(9), ubifs_wbuf_sync_nolock(9), ubifs_wbuf_seek_nolock(9), ubifs_bg_wbufs_sync(9), ubifs_write_node_hmac(9), ubifs_write_node(9), ubifs_read_node_wbuf(9), ubifs_read_node(9), ubifs_wbuf_init(9), ubifs_wbuf_add_ino_nolock(9), wbuf_has_ino(9), ubifs_sync_wbufs_by_inode(9)

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🎀 LATER, BESTIE 🎀

source: ./fs/ubifs — version vibes from October 2026 — ubifs_wbuf_write_nolock(9). slay, you understood the assignment. 💅✨