__rsv_window_dump(9)

okay so bestie, welcome to __rsv_window_dump(9) from the Kernel API Manual — it's giving “dump the filesystem block allocation reservation map”, and it's lowkey iconic for showing you reservation-window drama. 💖

🌸 NAME 🌸

__rsv_window_dump - - Dump the filesystem block allocation reservation map.

✨ SYNOPSIS ✨

void __rsv_window_dump (struct rb_root *root , int verbose , const char *fn );

💅 ARGUMENTS 💅

• root — root of per-filesystem reservation rb tree. Your tree's main character. 🌳
• verbose — verbose mode. Yep, that's the whole label; when it's turned on, see DESCRIPTION for the tea.
• fn — function which wishes to dump the reservation map. It's literally the function that wants the dump. 🫶

🦋 DESCRIPTION 🦋

If verbose is turned on, it will print the whole block reservation windows(start, end). Periodt. That's every whole window. ✨

Otherwise, it will only print out the "bad" windows — those windows that overlap with their immediate neighbors. Not me calling them bad, that's literally the manpage vibe. 😭

🔥 SEE ALSO 🔥

Kernel file ./fs/ext2/balloc.c is the main character, and these besties are all linked:

• goal_in_my_reservation(9)
• search_reserve_window(9)
• rsv_window_remove(9)
• ext2_init_block_alloc_info(9)
• ext2_discard_reservation(9)
• ext2_free_blocks(9)
• bitmap_search_next_usable_block(9)
• find_next_usable_block(9)
• ext2_try_to_allocate(9)
• find_next_reservable_window(9)
• alloc_new_reservation(9)
• try_to_extend_reservation(9)
• ext2_try_to_allocate_with_rsv(9)
• ext2_has_free_blocks(9)
• ext2_bg_has_super(9)
• ext2_bg_num_gdb(9)

And that's the tea, bestie: this page lives in the ./fs/ext2 source corner, dated October 2026, and answers to __rsv_window_dump(9). 💅✨