ext4_trim_fs(9)

🎀 NAME 🎀

okay so bestie, this is the ext4_trim_fs(9) page from the Kernel API Manual ✨ and it is literally the trim ioctl handle function. That's the whole name, no cap 💅.

✨ SYNOPSIS ✨

int ext4_trim_fs (struct super_block *sb , struct fstrim_range *range );

🌸 ARGUMENTS 🌸

• sb — superblock for filesystem 🫶
• range — fstrim_range structure 💖

🦋 DESCRIPTION 🦋

okay so here's the tea, the fields in play are giving very specific:

• start — First Byte to trim 👑
• len — number of Bytes to trim from start 🎀
• minlen — minimum extent length in Bytes 🌈

so ext4_trim_fs goes through all allocation groups containing Bytes from start to start+len. for each such a group, ext4_trim_all_free function is invoked to trim all free space. periodt 💅✨

💜 SEE ALSO 💜

• Kernel file ./fs/ext4/mballoc.c 📁
• ext4_mb_clear_bb(9) 🔥
• ext4_free_blocks(9) 🦋
• ext4_group_add_blocks(9) 🌸
• ext4_trim_extent(9) ⭐
• ext4_trim_all_free(9) 🧚

and that's the page, bestie 💖 source/version: ./fs/ext4; date: October 2026; it's the ext4_trim_fs(9) manual, mwah 😭🫶