From 6c6f57f3bee1e3c3d31b08a0161c435bfaeb77eb Mon Sep 17 00:00:00 2001 From: Michael Halcrow Date: Tue, 16 Oct 2007 01:28:01 -0700 Subject: [PATCH] eCryptfs: comments for some structs Andrew Morton wrote: > > +struct ecryptfs_global_auth_tok { > > +#define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 > > + u32 flags; > > + struct list_head mount_crypt_stat_list; > > + struct key *global_auth_tok_key; > > + struct ecryptfs_auth_tok *global_auth_tok; > > + unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; > > +}; > > + > > +struct ecryptfs_key_tfm { > > + struct crypto_blkcipher *key_tfm; > > + size_t key_size; > > + struct mutex key_tfm_mutex; > > + struct list_head key_tfm_list; > > + unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; > > +}; > > Please consider commenting your struct fields carefully: it's a > great way to help other to understand your code. Add some comments to the ecryptfs_global_auth_tok and ecryptfs_key_tfm structs to make their functions more easily ascertained. Signed-off-by: Michael Halcrow Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ecryptfs/ecryptfs_kernel.h | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h index 69f6a2289cdf..fd6dd585514c 100644 --- a/fs/ecryptfs/ecryptfs_kernel.h +++ b/fs/ecryptfs/ecryptfs_kernel.h @@ -273,20 +273,36 @@ struct ecryptfs_dentry_info { struct ecryptfs_crypt_stat *crypt_stat; }; +/** + * ecryptfs_global_auth_tok structs refer to authentication token keys + * in the user keyring that apply to newly created files. A list of + * these objects hangs off of the mount_crypt_stat struct for any + * given eCryptfs mount. This struct maintains a reference to both the + * key contents and the key itself so that the key can be put on + * unmount. + */ struct ecryptfs_global_auth_tok { #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 u32 flags; - struct list_head mount_crypt_stat_list; - struct key *global_auth_tok_key; - struct ecryptfs_auth_tok *global_auth_tok; - unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; + struct list_head mount_crypt_stat_list; /* Default auth_tok list for + * the mount_crypt_stat */ + struct key *global_auth_tok_key; /* The key from the user's keyring for + * the sig */ + struct ecryptfs_auth_tok *global_auth_tok; /* The key contents */ + unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; /* The key identifier */ }; +/** + * Typically, eCryptfs will use the same ciphers repeatedly throughout + * the course of its operations. In order to avoid unnecessarily + * destroying and initializing the same cipher repeatedly, eCryptfs + * keeps a list of crypto API contexts around to use when needed. + */ struct ecryptfs_key_tfm { struct crypto_blkcipher *key_tfm; size_t key_size; struct mutex key_tfm_mutex; - struct list_head key_tfm_list; + struct list_head key_tfm_list; /* The module's tfm list */ unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; }; -- 2.20.1