nilfs_copy_folio(9)

Hey bestie 💖 welcome to the Kernel API Manual — this is the page for nilfs_copy_folio(9), and it’s lowkey iconic.

✨ NAME ✨

nilfs_copy_folio — copy the folio with buffers

🌸 SYNOPSIS 🌸

void nilfs_copy_folio (struct folio *dst , struct folio *src , bool
       copy_dirty );

🎀 ARGUMENTS 🎀

• dst — destination folio. The one getting the copy, periodt.
• src — source folio. The one being copied from.
• copy_dirty — flag whether to copy dirty states on the folio’s buffer heads. Literally controls whether those dirty states get copied.

💖 DESCRIPTION 💖

Okay so here’s the vibe: this function is for both data folios and btnode folios. The dirty flag should be treated by caller — yes, caller, that’s you, bestie. The folio must not be under i/o. Both src and dst folio must be locked.

⚠️ Big warning: the folio must not be under i/o. Like, do not do it. 🔒 Also, both src and dst folio must be locked. Both. Locked. No cap.

👑 SEE ALSO 👑

The Kernel file is ./fs/nilfs2/page.c, and these related entries are 100% worth a peek:

• nilfs_forget_buffer(9)
• nilfs_copy_buffer(9)
• nilfs_folio_buffers_clean(9)
• nilfs_copy_back_pages(9)
• nilfs_clear_dirty_pages(9)
• nilfs_clear_folio_dirty(9)
• nilfs_find_uncommitted_extent(9)

byeee 🫶 this page comes from the ./fs/nilfs2 source/version, dated October 2026, and it’s literally nilfs_copy_folio(9). Slay. 💅