fallible_read_node(9)

🌸 NAME 🌸

okay so this is fallible_read_node(9) from the Kernel API Manual, and she is literally here to try to read a leaf node. bestie, that’s the whole vibe: leaf node, attempt, no cap. 🍓✨

🌟 SYNOPSIS 🌟

int fallible_read_node (struct ubifs_info *c , const union ubifs_key
*key , struct ubifs_zbranch *zbr , void *node );

🎀 ARGUMENTS 🎀

• c — the UBIFS file-system description object. iconic little context holder. 🫶
• key — key of node to read. yes bestie, the key. 🔑
• zbr — position of node. it’s giving “where we’re looking” energy. 📍
• node — node returned. the actual node comes back through this. 🎁

💅 DESCRIPTION 💅

so this function tries to read a node and then tells you what happened with its return value, periodt:

• 1 — the node is read. slay. ✅
• 0 — the node is not present. not me getting “no node here” energy. 🙈
• a negative error code — error case. literally the “something went wrong” branch. 😭

bestie, this is not a regular yes/no vibe check: 1 means read, 0 means not present, and negative means error. keep that straight and you’re golden. 💖

🦋 SEE ALSO 🦋

Kernel file: ./fs/ubifs/tnc.c — and the rest of the SEE ALSO squad is: insert_old_idx(9), insert_old_idx_znode(9), ins_clr_old_idx_znode(9), destroy_old_idx(9), copy_znode(9), add_idx_dirt(9), replace_znode(9), dirty_cow_znode(9), lnc_add(9), lnc_free(9), tnc_read_hashed_node(9), try_read_node(9), matches_name(9), get_znode(9), tnc_next(9), tnc_prev(9), resolve_collision(9), fallible_matches_name(9), fallible_resolve_collision(9), matches_position(9), resolve_collision_directly(9), dirty_cow_bottom_up(9), ubifs_lookup_level0(9), lookup_level0_dirty(9), maybe_leb_gced(9), ubifs_tnc_locate(9), ubifs_tnc_get_bu_keys(9), read_wbuf(9), validate_data_node(9), ubifs_tnc_bulk_read(9), do_lookup_nm(9), ubifs_tnc_lookup_nm(9), ubifs_tnc_lookup_dh(9), correct_parent_keys(9), insert_zbranch(9), tnc_insert(9), ubifs_tnc_add(9), ubifs_tnc_replace(9), ubifs_tnc_add_nm(9), tnc_delete(9), ubifs_tnc_remove(9), ubifs_tnc_remove_nm(9), ubifs_tnc_remove_dh(9), key_in_range(9), ubifs_tnc_remove_range(9), ubifs_tnc_remove_ino(9), ubifs_tnc_next_ent(9), tnc_destroy_cnext(9), ubifs_tnc_close(9), left_znode(9), right_znode(9), lookup_znode(9), is_idx_node_in_tnc(9), is_leaf_node_in_tnc(9), ubifs_tnc_has_node(9), ubifs_dirty_idx_node(9), dbg_check_inode_size(9).

💖 source/version: ./fs/ubifs · date: October 2026 · page: fallible_read_node(9) — mwah, that’s the whole page, bestie! 💅