ecryptfs_tfm_exists(9)

✨ ecryptfs_tfm_exists ✨

okay so bestie, welcome to the Kernel API Manual page for ecryptfs_tfm_exists(9) — yes that (9) is the section number, we're in kernel-land now, buckle up 🎀

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💖 NAME 💖

ecryptfs_tfm_exists — literally just goes looking for an existing tfm for cipher_name, that's the whole job 🕵️‍♀️

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🌸 SYNOPSIS 🌸

int ecryptfs_tfm_exists (char *cipher_name , struct ecryptfs_key_tfm
**key_tfm );

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🦋 ARGUMENTS 🦋

• cipher_name — the name of the cipher you're hunting for, like the name-name. this is your search query bestie 🔎
• key_tfm — gets set to the matching tfm if one is found. it's the output slot, the "here's your answer" spot 📬

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💅 DESCRIPTION 💅

so what it does: it searches the cache for a key_tfm that matches cipher_name. that's it. that's the function. no cap 💯

⚠️ but listen — it must be called with key_tfm_list_mutex held. not optional, not a vibe suggestion, it's a requirement. like holding someone's hand before crossing the street 🫶

and the return values, because this matters:

• returns 1 if it's found — and key_tfm gets set to the thing you found ✅
• returns 0 if it's not found — and key_tfm gets set to NULL, so like, don't go dereferencing it, it's emptier than my wallet 😭

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🔥 SEE ALSO 🔥

the kernel file vibes live in ./fs/ecryptfs/crypto.c — and here's the whole friend group, no one gets left behind 👑

• ecryptfs_from_hex(9)
• ecryptfs_derive_iv(9)
• ecryptfs_init_crypt_stat(9)
• ecryptfs_destroy_crypt_stat(9)
• virt_to_scatterlist(9)
• crypt_scatterlist(9)
• crypt_extent(9)
• ecryptfs_encrypt_page(9)
• ecryptfs_decrypt_page(9)
• ecryptfs_init_crypt_ctx(9)
• ecryptfs_copy_mount_wide_flags_to_inode_flags(9)
• ecryptfs_set_default_crypt_stat_vals(9)
• ecryptfs_new_file_context(9)
• ecryptfs_validate_marker(9)
• ecryptfs_process_flags(9)
• write_ecryptfs_marker(9)
• ecryptfs_code_for_cipher_string(9)
• ecryptfs_cipher_code_to_string(9)
• ecryptfs_write_headers_virt(9)
• ecryptfs_write_metadata(9)
• set_default_header_data(9)
• ecryptfs_read_headers_virt(9)
• ecryptfs_read_xattr_region(9)
• ecryptfs_process_key_cipher(9)
• ecryptfs_destroy_crypto(9)
• ecryptfs_get_tfm_and_mutex_for_cipher_name(9)
• ecryptfs_encode_for_filename(9)
• ecryptfs_decode_from_filename(9)
• ecryptfs_encrypt_and_encode_filename(9)
• ecryptfs_decode_and_decrypt_filename(9)

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okay that's the whole page, go forth and find your tfm bestie 🌈💜

and yeah — this one's from the source ./fs/ecryptfs, dated October 2026, page ecryptfs_tfm_exists(9). iconic, timeless, slay ✨🧚‍♀️