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[PATCH] eCryptfs: open-code flag checking and manipulation

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Open-code flag checking and manipulation.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Trevor Highland <tshighla@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 00:53:49 -08:00 • committed by Linus Torvalds
parent 9d8b8ce556
commit e2bd99ec5c
7 changed files with 49 additions and 68 deletions
Download patch file Download diff file Expand all files Collapse all files

37
fs/ecryptfs/crypto.c
View file

@ -207,7 +207,7 @@ ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
mutex_init(&crypt_stat->cs_mutex);
mutex_init(&crypt_stat->cs_tfm_mutex);
mutex_init(&crypt_stat->cs_hash_tfm_mutex);
ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_STRUCT_INITIALIZED);
crypt_stat->flags |= ECRYPTFS_STRUCT_INITIALIZED;
}
/**
@ -305,8 +305,7 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
int rc = 0;
BUG_ON(!crypt_stat || !crypt_stat->tfm
|| !ECRYPTFS_CHECK_FLAG(crypt_stat->flags,
ECRYPTFS_STRUCT_INITIALIZED));
|| !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED));
if (unlikely(ecryptfs_verbosity > 0)) {
ecryptfs_printk(KERN_DEBUG, "Key size [%d]; key:\n",
crypt_stat->key_size);
@ -485,7 +484,7 @@ int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx)
lower_inode = ecryptfs_inode_to_lower(ctx->page->mapping->host);
inode_info = ecryptfs_inode_to_private(ctx->page->mapping->host);
crypt_stat = &inode_info->crypt_stat;
if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED)) {
if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
rc = ecryptfs_copy_page_to_lower(ctx->page, lower_inode,
ctx->param.lower_file);
if (rc)
@ -617,7 +616,7 @@ int ecryptfs_decrypt_page(struct file *file, struct page *page)
crypt_stat = &(ecryptfs_inode_to_private(
page->mapping->host)->crypt_stat);
lower_inode = ecryptfs_inode_to_lower(page->mapping->host);
if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED)) {
if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
rc = ecryptfs_do_readpage(file, page, page->index);
if (rc)
ecryptfs_printk(KERN_ERR, "Error attempting to copy "
@ -882,7 +881,7 @@ int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat)
BUG_ON(crypt_stat->iv_bytes > MD5_DIGEST_SIZE);
BUG_ON(crypt_stat->iv_bytes <= 0);
if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_KEY_VALID)) {
if (!(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
rc = -EINVAL;
ecryptfs_printk(KERN_WARNING, "Session key not valid; "
"cannot generate root IV\n");
@ -899,8 +898,7 @@ int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat)
out:
if (rc) {
memset(crypt_stat->root_iv, 0, crypt_stat->iv_bytes);
ECRYPTFS_SET_FLAG(crypt_stat->flags,
ECRYPTFS_SECURITY_WARNING);
crypt_stat->flags |= ECRYPTFS_SECURITY_WARNING;
}
return rc;
}
@ -908,7 +906,7 @@ out:
static void ecryptfs_generate_new_key(struct ecryptfs_crypt_stat *crypt_stat)
{
get_random_bytes(crypt_stat->key, crypt_stat->key_size);
ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_KEY_VALID);
crypt_stat->flags |= ECRYPTFS_KEY_VALID;
ecryptfs_compute_root_iv(crypt_stat);
if (unlikely(ecryptfs_verbosity > 0)) {
ecryptfs_printk(KERN_DEBUG, "Generated new session key:\n");
@ -948,7 +946,7 @@ static void ecryptfs_set_default_crypt_stat_vals(
ecryptfs_set_default_sizes(crypt_stat);
strcpy(crypt_stat->cipher, ECRYPTFS_DEFAULT_CIPHER);
crypt_stat->key_size = ECRYPTFS_DEFAULT_KEY_BYTES;
ECRYPTFS_CLEAR_FLAG(crypt_stat->flags, ECRYPTFS_KEY_VALID);
crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID);
crypt_stat->file_version = ECRYPTFS_FILE_VERSION;
crypt_stat->mount_crypt_stat = mount_crypt_stat;
}
@ -988,8 +986,8 @@ int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry)
if (mount_crypt_stat->global_auth_tok) {
ecryptfs_printk(KERN_DEBUG, "Initializing context for new "
"file using mount_crypt_stat\n");
ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED);
ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_KEY_VALID);
crypt_stat->flags |= ECRYPTFS_ENCRYPTED;
crypt_stat->flags |= ECRYPTFS_KEY_VALID;
ecryptfs_copy_mount_wide_flags_to_inode_flags(crypt_stat,
mount_crypt_stat);
memcpy(crypt_stat->keysigs[crypt_stat->num_keysigs++],
@ -1074,11 +1072,9 @@ static int ecryptfs_process_flags(struct ecryptfs_crypt_stat *crypt_stat,
for (i = 0; i < ((sizeof(ecryptfs_flag_map)
/ sizeof(struct ecryptfs_flag_map_elem))); i++)
if (flags & ecryptfs_flag_map[i].file_flag) {
ECRYPTFS_SET_FLAG(crypt_stat->flags,
ecryptfs_flag_map[i].local_flag);
crypt_stat->flags |= ecryptfs_flag_map[i].local_flag;
} else
ECRYPTFS_CLEAR_FLAG(crypt_stat->flags,
ecryptfs_flag_map[i].local_flag);
crypt_stat->flags &= ~(ecryptfs_flag_map[i].local_flag);
/* Version is in top 8 bits of the 32-bit flag vector */
crypt_stat->file_version = ((flags >> 24) & 0xFF);
(*bytes_read) = 4;
@ -1115,8 +1111,7 @@ write_ecryptfs_flags(char *page_virt, struct ecryptfs_crypt_stat *crypt_stat,
for (i = 0; i < ((sizeof(ecryptfs_flag_map)
/ sizeof(struct ecryptfs_flag_map_elem))); i++)
if (ECRYPTFS_CHECK_FLAG(crypt_stat->flags,
ecryptfs_flag_map[i].local_flag))
if (crypt_stat->flags & ecryptfs_flag_map[i].local_flag)
flags |= ecryptfs_flag_map[i].file_flag;
/* Version is in top 8 bits of the 32-bit flag vector */
flags |= ((((u8)crypt_stat->file_version) << 24) & 0xFF000000);
@ -1414,10 +1409,8 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
crypt_stat = &ecryptfs_inode_to_private(
ecryptfs_dentry->d_inode)->crypt_stat;
if (likely(ECRYPTFS_CHECK_FLAG(crypt_stat->flags,
ECRYPTFS_ENCRYPTED))) {
if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags,
ECRYPTFS_KEY_VALID)) {
if (likely(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
if (!(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
ecryptfs_printk(KERN_DEBUG, "Key is "
"invalid; bailing out\n");
rc = -EINVAL;