set_default_header_data(9)

✨ set_default_header_data(9) ✨

okay so this is a page from the Kernel API Manual (yes the whole kernel manual, we're fancy now 💅) and it's all about one little function called set_default_header_data. buckle up bestie, it's short but it's important.

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🌸 NAME 🌸

set_default_header_data — literally no description given in the original, so like… the name is the whole personality bestie 🎀 (ngl, that's kind of iconic of it)

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🦋 SYNOPSIS 🦋

void set_default_header_data (struct ecryptfs_crypt_stat *crypt_stat );

copy it exactly like that, spacing and all, no cap 🫶

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💖 ARGUMENTS 💖

• crypt_stat — the cryptographic context ✨ that's the whole argument, the one and only, the main character of this function call. she holds the crypto context and she's doing her job.

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🔥 DESCRIPTION 🔥

okay so here's the tea ☕ this function is for version 0 file format.

and like — it is only there for backwards compatibility for files that were created with the prior versions of eCryptfs 💀. so it's not out here doing new stuff, it's out here being a little historical preservation icon for your old files. legacy support queen 👑 fr fr.

not me getting emotional over a compatibility shim 😭 she's just doing her best for the old files.

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⭐ SEE ALSO ⭐

the original page tells you to look at the Kernel file ./fs/ecryptfs/crypto.c, plus this whole friend group of functions — every single one of them, here we go, don't skip, I promised 🫡:

• 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)
• ecryptfs_read_headers_virt(9)
• ecryptfs_read_xattr_region(9)
• ecryptfs_process_key_cipher(9)
• ecryptfs_destroy_crypto(9)
• ecryptfs_tfm_exists(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)

like, that's a whole group chat right there 😭 and the Kernel file one is ./fs/ecryptfs/crypto.c in case you need to go read the source, iykyk 🧚

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and that's the page!! short, sweet, backwards-compatible 🍓

cute little sign-off: this one lives in the source directory ./fs/ecryptfs, it's dated October 2026, and it's filed under set_default_header_data(9) in the Kernel API Manual. slay, go read your kernel source bestie 💜🌟