befs_btree_read(9)

💖 NAME 💖

okay so this page is befs_btree_read(9) from the Kernel API Manual 💅 and the name line is literally:

befs_btree_read - Traverse leafnodes of a btree

✨ SYNOPSIS ✨

bestie, here's the signature, untouched and iconic:

       int befs_btree_read (struct super_block *sb , const befs_data_stream *ds
       , loff_t key_no , size_t bufsize , char *keybuf , size_t * keysize ,
       befs_off_t * value );

🎀 ARGUMENTS 🎀

the whole cast, no cap:

• sb — Filesystem superblock
• ds — Datastream containing btree
• key_no — Key number (alphabetical order) of key to read
• bufsize — Size of the buffer to return key in
• keybuf — Pointer to a buffer to put the key in
• keysize — Length of the returned key
• value — Value stored with the returned key

🦋 DESCRIPTION 🦋

Here's how it works, bestie: key_no is the index of the key/value pair to return in keybuf/value. bufsize is the size of keybuf (BEFS_NAME_LEN+1 is a good size). keysize is the number of characters in the key (just a convenience).

Algorithm time 🔥: Get the first leafnode of the tree. See if the requested key is in that node. If not, follow the node->right link to the next leafnode. Repeat until the (key_no)th key is found or the tree is out of keys.

🌈 SEE ALSO 🌈

Kernel file ./fs/befs/btree.c is the main character, and the whole squad is:

• befs_bt_read_super(9)
• befs_bt_read_node(9)
• befs_btree_find(9)
• befs_find_key(9)
• befs_btree_seekleaf(9)
• befs_leafnode(9)
• befs_bt_keylen_index(9)
• befs_bt_valarray(9)
• befs_bt_keydata(9)
• befs_bt_get_key(9)
• befs_compare_strings(9)

okay that's the whole page, bestie 🫶 source/version: ./fs/befs; date: October 2026; page: befs_btree_read(9). bye 💖