ubifs_read_node(9)

💖 ubifs_read_node(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ this one's all about ubifs_read_node — from ./fs/ubifs, dated October 2026, and it's giving "small function, very important job" energy fr fr 🎀

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🌸 NAME 🌸

ubifs_read_node — read node. that's it. that's the whole name. short, sweet, iconic 👑

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✨ SYNOPSIS ✨

int ubifs_read_node (const struct ubifs_info *c , void *buf , int type ,
int len , int lnum , int offs );

look at her go 😭 six args, one int return, no notes. copy it exactly if you're writing code, bestie, don't be freehanding this 💅

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🦋 ARGUMENTS 🦋

• c — the UBIFS file-system description object. your whole filesystem vibe in a struct, basically 🫶
• buf — the buffer you're reading into. this is where the node lands, so make sure it's real 💀
• type — the node type. you gotta tell it what kind of node you're expecting 👀
• len — the node length, and lowkey important: it's not aligned. not aligned!! don't round it, don't "fix" it, just pass it 🧚
• lnum — logical eraseblock number. which LEB we're hanging out in 🌈
• offs — offset within that logical eraseblock. like where in the LEB, exactly 📍

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💜 DESCRIPTION 💜

okay so here's the tea ☕ this function reads a node of known type and length, checks it, and stores it in buf. that's the whole flow: read it, verify it, drop it in the buffer, slay 💅✨

and the returns? pay attention bestie, this is the part people mess up:

• returns zero in case of success 🎉
• returns -EUCLEAN if the CRC mismatched 😭 (yes, the checksum said no)
• returns a negative error code in case of failure 💀

ngl, "negative error code in case of failure" is a whole vibe — the CRC case gets its own special -EUCLEAN moment, so don't lump them together, iykyk 👑

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🎀 SEE ALSO 🎀

the kernel file ./fs/ubifs/io.c lives here, and honestly the whole friend group showed up for this one 🫶:

• 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_wbuf_write_nolock(9)
• ubifs_write_node_hmac(9)
• ubifs_write_node(9)
• ubifs_read_node_wbuf(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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and that's the page!! 🦋 mwah 💋 this little manual page comes from ./fs/ubifs, dated October 2026, and it's titled ubifs_read_node(9) — go read some nodes bestie, you've got this 💖🎀✨