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[PATCH] eCryptfs: Generalize metadata read/write

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Generalize the metadata reading and writing mechanisms, with two targets for
now: metadata in file header and metadata in the user.ecryptfs xattr of the
lower file.

[akpm@osdl.org: printk warning fix]
[bunk@stusta.de: make some needlessly global code static]
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Halcrow 2007-02-12 00:53:46 -08:00 • committed by Linus Torvalds
parent 17398957aa
commit dd2a3b7ad9
7 changed files with 348 additions and 146 deletions
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51
fs/ecryptfs/ecryptfs_kernel.h
View file

@ -4,7 +4,7 @@
*
* Copyright (C) 1997-2003 Erez Zadok
* Copyright (C) 2001-2003 Stony Brook University
* Copyright (C) 2004-2006 International Business Machines Corp.
* Copyright (C) 2004-2007 International Business Machines Corp.
* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
* Trevor S. Highland <trevor.highland@gmail.com>
* Tyler Hicks <tyhicks@ou.edu>
@ -50,8 +50,8 @@
#define ECRYPTFS_VERSIONING_XATTR 0x00000010
#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
| ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
| ECRYPTFS_VERSIONING_PUBKEY)
| ECRYPTFS_VERSIONING_PUBKEY \
| ECRYPTFS_VERSIONING_XATTR)
#define ECRYPTFS_MAX_PASSWORD_LENGTH 64
#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
#define ECRYPTFS_SALT_SIZE 8
@ -83,6 +83,7 @@
#define ECRYPTFS_TRANSPORT_CONNECTOR 1
#define ECRYPTFS_TRANSPORT_RELAYFS 2
#define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_NETLINK
#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
#define RFC2440_CIPHER_DES3_EDE 0x02
#define RFC2440_CIPHER_CAST_5 0x03
@ -327,18 +328,6 @@ struct ecryptfs_msg_ctx {
struct mutex mux;
};
extern struct list_head ecryptfs_msg_ctx_free_list;
extern struct list_head ecryptfs_msg_ctx_alloc_list;
extern struct mutex ecryptfs_msg_ctx_lists_mux;
#define ecryptfs_uid_hash(uid) \
hash_long((unsigned long)uid, ecryptfs_hash_buckets)
extern struct hlist_head *ecryptfs_daemon_id_hash;
extern struct mutex ecryptfs_daemon_id_hash_mux;
extern int ecryptfs_hash_buckets;
extern unsigned int ecryptfs_msg_counter;
extern struct ecryptfs_msg_ctx *ecryptfs_msg_ctx_arr;
extern unsigned int ecryptfs_transport;
struct ecryptfs_daemon_id {
@ -479,6 +468,7 @@ extern struct kmem_cache *ecryptfs_sb_info_cache;
extern struct kmem_cache *ecryptfs_header_cache_0;
extern struct kmem_cache *ecryptfs_header_cache_1;
extern struct kmem_cache *ecryptfs_header_cache_2;
extern struct kmem_cache *ecryptfs_xattr_cache;
extern struct kmem_cache *ecryptfs_lower_page_cache;
int ecryptfs_interpose(struct dentry *hidden_dentry,
@ -505,9 +495,13 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
char *cipher_name,
char *chaining_modifier);
int ecryptfs_write_inode_size_to_header(struct file *lower_file,
struct inode *lower_inode,
struct inode *inode);
#define ECRYPTFS_LOWER_I_MUTEX_NOT_HELD 0
#define ECRYPTFS_LOWER_I_MUTEX_HELD 1
int ecryptfs_write_inode_size_to_metadata(struct file *lower_file,
struct inode *lower_inode,
struct inode *inode,
struct dentry *ecryptfs_dentry,
int lower_i_mutex_held);
int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
struct file *lower_file,
unsigned long lower_page_index, int byte_offset,
@ -529,17 +523,15 @@ int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
struct writeback_control *wbc);
int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx);
int ecryptfs_decrypt_page(struct file *file, struct page *page);
int ecryptfs_write_headers(struct dentry *ecryptfs_dentry,
int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
struct file *lower_file);
int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry,
struct file *lower_file);
int ecryptfs_write_headers_virt(char *page_virt,
struct ecryptfs_crypt_stat *crypt_stat,
struct dentry *ecryptfs_dentry);
int ecryptfs_read_headers(struct dentry *ecryptfs_dentry,
struct file *lower_file);
int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
int contains_ecryptfs_marker(char *data);
int ecryptfs_read_header_region(char *data, struct dentry *dentry,
struct vfsmount *mnt);
int ecryptfs_read_and_validate_header_region(char *data, struct dentry *dentry,
struct vfsmount *mnt);
int ecryptfs_read_and_validate_xattr_region(char *page_virt,
struct dentry *ecryptfs_dentry);
u16 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat);
int ecryptfs_cipher_code_to_string(char *str, u16 cipher_code);
void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
@ -562,6 +554,11 @@ int ecryptfs_open_lower_file(struct file **lower_file,
struct dentry *lower_dentry,
struct vfsmount *lower_mnt, int flags);
int ecryptfs_close_lower_file(struct file *lower_file);
ssize_t ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
size_t size);
int
ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags);
int ecryptfs_process_helo(unsigned int transport, uid_t uid, pid_t pid);
int ecryptfs_process_quit(uid_t uid, pid_t pid);