gfs2_alloc_extent(9)

💖 NAME 💖

okay so bestie, welcome to gfs2_alloc_extent(9) from the Kernel API Manual ✨ this one is literally gfs2_alloc_extent — allocate an extent from a given bitmap 🦋

🌸 SYNOPSIS 🌸

void gfs2_alloc_extent (const struct gfs2_rbm *rbm , bool dinode ,
unsigned int *n );

🎀 ARGUMENTS 🎀

• rbm — the resource group information 🫶
• dinode — TRUE if the first block we allocate is for a dinode 💅
• n — The extent length (value/result) ⭐

✨ DESCRIPTION ✨

So here's the vibe: add the bitmap buffer to the transaction. Then set the found bits to new_state to change the block's allocation state. That's the whole tea, no cap 😭🔥

👑 SEE ALSO 👑

Kernel file ./fs/gfs2/rgrp.c, plus this whole friend group: gfs2_setbit(9), gfs2_testbit(9), gfs2_bit_search(9), rs_cmp(9), gfs2_bitfit(9), gfs2_rbm_from_block(9), gfs2_rbm_add(9), gfs2_unaligned_extlen(9), gfs2_free_extlen(9), gfs2_bitcount(9), gfs2_rgrp_verify(9), gfs2_blk2rgrpd(9), gfs2_rgrpd_get_first(9), gfs2_rgrpd_get_next(9), __rs_deltree(9), gfs2_rs_deltree(9), gfs2_rs_delete(9), return_all_reservations(9), compute_bitstructs(9), gfs2_ri_total(9), read_rindex_entry(9), set_rgrp_preferences(9), gfs2_ri_update(9), gfs2_rindex_update(9), gfs2_rgrp_go_instantiate(9), gfs2_rgrp_brelse(9), gfs2_fitrim(9), rs_insert(9), rgd_free(9), rg_mblk_search(9), gfs2_next_unreserved_block(9), gfs2_reservation_check_and_update(9), gfs2_rbm_find(9), try_rgrp_unlink(9), gfs2_rgrp_congested(9), gfs2_rgrp_used_recently(9), fast_to_acquire(9), gfs2_inplace_reserve(9), gfs2_inplace_release(9), rgblk_free(9), gfs2_rgrp_dump(9), gfs2_adjust_reservation(9), gfs2_set_alloc_start(9), gfs2_alloc_blocks(9), __gfs2_free_blocks(9), gfs2_free_meta(9), gfs2_check_blk_type(9), gfs2_rlist_add(9), gfs2_rlist_alloc(9), gfs2_rlist_free(9).

mwah 💋 this page comes from ./fs/gfs2 and is dated October 2026 — gfs2_alloc_extent(9) out, bye bestie 👑💜 periodt.