ceph_fscrypt...rypt_extents(9)

✨ NAME ✨

okay bestie, this page is ceph_fscrypt_decrypt_extents from the Kernel API Manual — page ceph_fscrypt...rypt_extents(9) — and it's literally here to decrypt received extents in given buffer. that's the whole vibe. 💅

🌸 SYNOPSIS 🌸

int ceph_fscrypt_decrypt_extents (struct inode *inode , struct page
       **page , u64 off , struct ceph_sparse_extent *map , u32 ext_cnt );

🎀 ARGUMENTS 🎀

• inode — the inode associated with pages being decrypted. it's the main-character inode, basically.
• page — pointer to page array. yes, pages plural, she contains multitudes.
• off — offset into the file that the data in page[0] starts. so you know exactly where the tea begins.
• map — pointer to extent array. the map, the blueprint, the layout.
• ext_cnt — length of extent array. gotta know how many extents we're working with, fr fr.

🦋 DESCRIPTION 🦋

so here's the tea: you give it an extent map and a page array, and it decrypts the received data in-place, skipping holes like they're irrelevant. no cap, holes do not get decrypted.

Returns the offset into buffer of end of last decrypted block. that's the return value, bestie — the end-of-last-decrypted-block offset. ✨

💖 SEE ALSO 💖

• Kernel file ./fs/ceph/crypto.c
• ceph_fname_to_usr(9)
• ceph_fscrypt_prepare_readdir(9)
• ceph_fscrypt_decrypt_pages(9)
• ceph_fscrypt_encrypt_pages(9)

mwah 💋 shoutout to the source/version tag ./fs/ceph, the date October 2026, and the ceph_fscrypt...rypt_extents(9) manual — that's the sign-off, bestie. periodt. 🫶