ltree_add_entry(9)

💖 ltree_add_entry — the Kernel API Manual glow-up 🎀

okay bestie, listen, this one is a kernel API manual page for ltree_add_entry(9), and it's genuinely so good. it lives over in the kernel file ./drivers/mtd/ubi/eba.c, and it's giving "tiny function, big responsibilities" energy. let's get into it ✨

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🌸 SYNOPSIS 🌸

struct ubi_ltree_entry * ltree_add_entry (struct ubi_device *ubi , int
vol_id , int lnum );

that's the whole vibe: you hand it a ubi, a vol_id, and an lnum, and you get back a pointer to a struct ubi_ltree_entry. periodt 💅

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🦋 ARGUMENTS 🦋

• ubi — the UBI device description object. this is the main character of the operation ngl 👑
• vol_id — the volume ID. literally which volume we're talking about 🍓
• lnum — the logical eraseblock number. the where in the log, iykyk

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💜 DESCRIPTION 💜

so what does it actually do? bestie, it adds a new entry for the logical eraseblock (vol_id, lnum) to the lock tree 🔥

and here's the cute part: if such an entry is already there, it doesn't get mad, it doesn't throw a fit — it just increases its usage counter 🫶. not me being obsessed with that kind of grace.

it returns a pointer to the lock tree entry, or -ENOMEM if memory allocation failed 😭 (allocation said no, and honestly? relatable).

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🌈 SEE ALSO 🌈

okay this list is long and honestly iconic. everything here is family 🧚:

• Kernel file ./drivers/mtd/ubi/eba.c
• struct ubi_eba_entry(9)
• struct ubi_eba_table(9)
• ubi_next_sqnum(9)
• ubi_get_compat(9)
• ubi_eba_get_ldesc(9)
• ubi_eba_create_table(9)
• ubi_eba_destroy_table(9)
• ubi_eba_copy_table(9)
• ubi_eba_replace_table(9)
• ltree_lookup(9)
• leb_read_lock(9)
• leb_read_unlock(9)
• leb_write_lock(9)
• leb_write_trylock(9)
• leb_write_unlock(9)
• ubi_eba_is_mapped(9)
• ubi_eba_unmap_leb(9)
• check_mapping(9)
• ubi_eba_read_leb(9)
• ubi_eba_read_leb_sg(9)
• try_recover_peb(9)
• recover_peb(9)
• try_write_vid_and_data(9)
• ubi_eba_write_leb(9)
• ubi_eba_write_leb_st(9)
• is_error_sane(9)
• ubi_eba_copy_leb(9)
• print_rsvd_warning(9)
• self_check_eba(9)
• ubi_eba_init(9)

like, the way that's a whole friend group 😭💀 going from ltree_lookup(9) all the way to ubi_eba_init(9) — a full arc, no cap.

lowkey a reminder: those are all (9) pages, so you're reading kernel API docs, not your average userland manpage. read them carefully bestie, they're not light reading 🌸

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sign-off szn 💅✨

this little masterpiece is dated October 2026, and it comes to you straight from the source path ./drivers/mtd/ubi — that's the footer info, folded in cute-style because we don't copy-paste headers and footers around here, we curate them 🎀

go add those lock tree entries, bestie. slay 💖🦋