ceph_fscrypt_encrypt_pages(9)

💅 ceph_fscrypt_encrypt_pages(9) — from the Kernel API Manual, bestie

okay so picture this: it's a kernel API manual page, it's called ceph_fscrypt_encrypt_pages, and it's literally about locking down an array of pages so nobody can snoop. we're in section 9 (kernel interfaces, iykyk). let's get into it 🫶

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✨ NAME ✨

ceph_fscrypt_encrypt_pages — encrypt an array of pages. that's the whole vibe. 🎀

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🌸 SYNOPSIS 🌸

int ceph_fscrypt_encrypt_pages (struct inode *inode , struct page **page
, u64 off , int len );

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🦋 ARGUMENTS 🦋

• inode — pointer to the inode associated with these pages. it's giving "which file are we even talking about" energy 💫
• page — pointer to the page array. the actual pages, plural, an ensemble cast 👑
• off — offset into the file that the data starts. where the tea begins ☕
• len — max length to encrypt. the upper limit, the ceiling, the cap fr fr 🧢

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💖 DESCRIPTION 💖

okay so what it does: it encrypts an array of cleartext pages and returns the amount of data encrypted. iconic behaviour, no notes.

two little rules you need to know, and please don't skip them:

• any data in the page prior to the start of the first complete block in the read is ignored. like, not invited to the party 🙈
• any incomplete crypto blocks at the end of the array are ignored too. partial blocks don't get to slay today 💅

returns the length of the encrypted data, or a negative errno. so if it comes back negative, that's your sign something went sideways 😭

ngl, "ignored" is doing a lot of work in this paragraph — it's not a suggestion, it's the actual documented behaviour. remember it.

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⭐ SEE ALSO ⭐

• Kernel file ./fs/ceph/crypto.c — the source, the mothership 🧚
• ceph_fname_to_usr(9)
• ceph_fscrypt_prepare_readdir(9)
• ceph_fscrypt_decrypt_pages(9)
• ceph_fscrypt_decrypt_extents(9)

all the cousins of this function, go read them too, they're also iconic 🌈

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and that's the whole page, bestie 💜 this one lives in ./fs/ceph and is dated October 2026, filed under ceph_fscrypt_encrypt_pages(9) — go forth and encrypt responsibly, mwah 🍓🔥