folio_test_uptodate(9)

🦋 NAME 🦋

folio_test_uptodate — Is this folio up to date?

okay so bestie, welcome to the Kernel API Manual corner of the group chat 😌✨ this page is literally all about folio_test_uptodate(9), and it’s giving “quick vibe check for folios” energy 💅

✨ SYNOPSIS ✨

bool folio_test_uptodate (const struct folio *folio );

🎀 ARGUMENTS 🎀

• folio — The folio. That’s the one we’re checking, periodt. 💖

💜 DESCRIPTION 💜

The uptodate flag is set on a folio when every byte in the folio is at least as new as the corresponding bytes on storage. No cap. ✨

Anonymous and CoW folios are always uptodate — like, always always, main character energy 👑🦋

If the folio is not uptodate, some of the bytes in it may be; see the is_partially_uptodate address_space operation. iykyk 😭

🌈 SEE ALSO 🌈

Kernel file ./include/linux/page-flags.h has the receipts 🫶

• page_folio(9)
• folio_page(9)
• folio_xor_flags_has_waiters(9)
• folio_test_large(9)
• PageHuge(9)
• page_has_movable_ops(9)
• folio_has_private(9)

cute sign-off bestie 🎀 source/version situation is ./include/linux, date is October 2026, and yeah the title is literally folio_test_uptodate(9). byeee 💖🌸🦋