Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6: eCryptfs: Remove ecryptfs_header_cache_2 eCryptfs: Cleanup and optimize ecryptfs_lookup_interpose() eCryptfs: Return useful code from contains_ecryptfs_marker eCryptfs: Fix new inode race condition eCryptfs: Cleanup inode initialization code eCryptfs: Consolidate inode functions into inode.c
This commit is contained in:
Linus Torvalds
commit
bd1bfe40ac
@ -1024,25 +1024,25 @@ out:
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}
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/**
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* contains_ecryptfs_marker - check for the ecryptfs marker
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* ecryptfs_validate_marker - check for the ecryptfs marker
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* @data: The data block in which to check
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*
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* Returns one if marker found; zero if not found
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* Returns zero if marker found; -EINVAL if not found
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*/
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static int contains_ecryptfs_marker(char *data)
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static int ecryptfs_validate_marker(char *data)
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{
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u32 m_1, m_2;
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m_1 = get_unaligned_be32(data);
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m_2 = get_unaligned_be32(data + 4);
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if ((m_1 ^ MAGIC_ECRYPTFS_MARKER) == m_2)
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return 1;
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return 0;
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ecryptfs_printk(KERN_DEBUG, "m_1 = [0x%.8x]; m_2 = [0x%.8x]; "
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"MAGIC_ECRYPTFS_MARKER = [0x%.8x]\n", m_1, m_2,
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MAGIC_ECRYPTFS_MARKER);
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ecryptfs_printk(KERN_DEBUG, "(m_1 ^ MAGIC_ECRYPTFS_MARKER) = "
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"[0x%.8x]\n", (m_1 ^ MAGIC_ECRYPTFS_MARKER));
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return 0;
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return -EINVAL;
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}
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struct ecryptfs_flag_map_elem {
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@ -1201,27 +1201,19 @@ int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code)
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return rc;
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}
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int ecryptfs_read_and_validate_header_region(char *data,
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struct inode *ecryptfs_inode)
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int ecryptfs_read_and_validate_header_region(struct inode *inode)
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{
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struct ecryptfs_crypt_stat *crypt_stat =
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&(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
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u8 file_size[ECRYPTFS_SIZE_AND_MARKER_BYTES];
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u8 *marker = file_size + ECRYPTFS_FILE_SIZE_BYTES;
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int rc;
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if (crypt_stat->extent_size == 0)
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crypt_stat->extent_size = ECRYPTFS_DEFAULT_EXTENT_SIZE;
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rc = ecryptfs_read_lower(data, 0, crypt_stat->extent_size,
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ecryptfs_inode);
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if (rc < 0) {
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printk(KERN_ERR "%s: Error reading header region; rc = [%d]\n",
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__func__, rc);
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goto out;
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}
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if (!contains_ecryptfs_marker(data + ECRYPTFS_FILE_SIZE_BYTES)) {
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rc = -EINVAL;
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} else
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rc = 0;
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out:
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rc = ecryptfs_read_lower(file_size, 0, ECRYPTFS_SIZE_AND_MARKER_BYTES,
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inode);
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if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
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return rc >= 0 ? -EINVAL : rc;
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rc = ecryptfs_validate_marker(marker);
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if (!rc)
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ecryptfs_i_size_init(file_size, inode);
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return rc;
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}
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@ -1242,8 +1234,7 @@ ecryptfs_write_header_metadata(char *virt,
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(*written) = 6;
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}
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struct kmem_cache *ecryptfs_header_cache_1;
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struct kmem_cache *ecryptfs_header_cache_2;
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struct kmem_cache *ecryptfs_header_cache;
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/**
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* ecryptfs_write_headers_virt
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@ -1496,11 +1487,9 @@ static int ecryptfs_read_headers_virt(char *page_virt,
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crypt_stat->mount_crypt_stat = &ecryptfs_superblock_to_private(
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ecryptfs_dentry->d_sb)->mount_crypt_stat;
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offset = ECRYPTFS_FILE_SIZE_BYTES;
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rc = contains_ecryptfs_marker(page_virt + offset);
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if (rc == 0) {
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rc = -EINVAL;
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rc = ecryptfs_validate_marker(page_virt + offset);
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if (rc)
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goto out;
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}
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if (!(crypt_stat->flags & ECRYPTFS_I_SIZE_INITIALIZED))
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ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
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offset += MAGIC_ECRYPTFS_MARKER_SIZE_BYTES;
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@ -1567,20 +1556,21 @@ out:
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return rc;
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}
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int ecryptfs_read_and_validate_xattr_region(char *page_virt,
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struct dentry *ecryptfs_dentry)
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int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
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struct inode *inode)
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{
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u8 file_size[ECRYPTFS_SIZE_AND_MARKER_BYTES];
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u8 *marker = file_size + ECRYPTFS_FILE_SIZE_BYTES;
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int rc;
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rc = ecryptfs_read_xattr_region(page_virt, ecryptfs_dentry->d_inode);
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if (rc)
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goto out;
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if (!contains_ecryptfs_marker(page_virt + ECRYPTFS_FILE_SIZE_BYTES)) {
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printk(KERN_WARNING "Valid data found in [%s] xattr, but "
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"the marker is invalid\n", ECRYPTFS_XATTR_NAME);
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rc = -EINVAL;
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}
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out:
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rc = ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
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ECRYPTFS_XATTR_NAME, file_size,
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ECRYPTFS_SIZE_AND_MARKER_BYTES);
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if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
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return rc >= 0 ? -EINVAL : rc;
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rc = ecryptfs_validate_marker(marker);
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if (!rc)
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ecryptfs_i_size_init(file_size, inode);
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return rc;
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}
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@ -1610,7 +1600,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
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ecryptfs_copy_mount_wide_flags_to_inode_flags(crypt_stat,
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mount_crypt_stat);
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/* Read the first page from the underlying file */
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page_virt = kmem_cache_alloc(ecryptfs_header_cache_1, GFP_USER);
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page_virt = kmem_cache_alloc(ecryptfs_header_cache, GFP_USER);
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if (!page_virt) {
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rc = -ENOMEM;
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printk(KERN_ERR "%s: Unable to allocate page_virt\n",
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@ -1655,7 +1645,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
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out:
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if (page_virt) {
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memset(page_virt, 0, PAGE_CACHE_SIZE);
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kmem_cache_free(ecryptfs_header_cache_1, page_virt);
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kmem_cache_free(ecryptfs_header_cache, page_virt);
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}
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return rc;
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}
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@ -200,6 +200,8 @@ ecryptfs_get_key_payload_data(struct key *key)
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#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
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#define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */
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#define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
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#define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \
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+ MAGIC_ECRYPTFS_MARKER_SIZE_BYTES)
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#define ECRYPTFS_DEFAULT_CIPHER "aes"
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#define ECRYPTFS_DEFAULT_KEY_BYTES 16
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#define ECRYPTFS_DEFAULT_HASH "md5"
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@ -603,8 +605,7 @@ extern struct kmem_cache *ecryptfs_file_info_cache;
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extern struct kmem_cache *ecryptfs_dentry_info_cache;
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extern struct kmem_cache *ecryptfs_inode_info_cache;
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extern struct kmem_cache *ecryptfs_sb_info_cache;
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extern struct kmem_cache *ecryptfs_header_cache_1;
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extern struct kmem_cache *ecryptfs_header_cache_2;
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extern struct kmem_cache *ecryptfs_header_cache;
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extern struct kmem_cache *ecryptfs_xattr_cache;
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extern struct kmem_cache *ecryptfs_key_record_cache;
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extern struct kmem_cache *ecryptfs_key_sig_cache;
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@ -625,14 +626,9 @@ struct ecryptfs_open_req {
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struct list_head kthread_ctl_list;
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};
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#define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001
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int ecryptfs_interpose(struct dentry *hidden_dentry,
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struct dentry *this_dentry, struct super_block *sb,
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u32 flags);
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struct inode *ecryptfs_get_inode(struct inode *lower_inode,
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struct super_block *sb);
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void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
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int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
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struct dentry *lower_dentry,
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struct inode *ecryptfs_dir_inode);
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int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
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size_t *decrypted_name_size,
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struct dentry *ecryptfs_dentry,
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@ -664,10 +660,9 @@ int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
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void ecryptfs_write_crypt_stat_flags(char *page_virt,
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struct ecryptfs_crypt_stat *crypt_stat,
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size_t *written);
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int ecryptfs_read_and_validate_header_region(char *data,
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struct inode *ecryptfs_inode);
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int ecryptfs_read_and_validate_xattr_region(char *page_virt,
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struct dentry *ecryptfs_dentry);
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int ecryptfs_read_and_validate_header_region(struct inode *inode);
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int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
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struct inode *inode);
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u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
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int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
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void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
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@ -679,9 +674,6 @@ int
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ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
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unsigned char *src, struct dentry *ecryptfs_dentry);
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int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
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int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
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int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
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void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
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ssize_t
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ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
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void *value, size_t size);
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@ -761,7 +753,7 @@ int ecryptfs_privileged_open(struct file **lower_file,
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struct dentry *lower_dentry,
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struct vfsmount *lower_mnt,
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const struct cred *cred);
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int ecryptfs_get_lower_file(struct dentry *ecryptfs_dentry);
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int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
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void ecryptfs_put_lower_file(struct inode *inode);
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int
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ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
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@ -191,7 +191,7 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
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| ECRYPTFS_ENCRYPTED);
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}
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mutex_unlock(&crypt_stat->cs_mutex);
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rc = ecryptfs_get_lower_file(ecryptfs_dentry);
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rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
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if (rc) {
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printk(KERN_ERR "%s: Error attempting to initialize "
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"the lower file for the dentry with name "
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@ -51,6 +51,97 @@ static void unlock_dir(struct dentry *dir)
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dput(dir);
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}
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static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
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{
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if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode)
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return 1;
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return 0;
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}
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static int ecryptfs_inode_set(struct inode *inode, void *opaque)
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{
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struct inode *lower_inode = opaque;
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ecryptfs_set_inode_lower(inode, lower_inode);
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fsstack_copy_attr_all(inode, lower_inode);
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/* i_size will be overwritten for encrypted regular files */
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fsstack_copy_inode_size(inode, lower_inode);
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inode->i_ino = lower_inode->i_ino;
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inode->i_version++;
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inode->i_mapping->a_ops = &ecryptfs_aops;
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if (S_ISLNK(inode->i_mode))
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inode->i_op = &ecryptfs_symlink_iops;
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else if (S_ISDIR(inode->i_mode))
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inode->i_op = &ecryptfs_dir_iops;
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else
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inode->i_op = &ecryptfs_main_iops;
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if (S_ISDIR(inode->i_mode))
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inode->i_fop = &ecryptfs_dir_fops;
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else if (special_file(inode->i_mode))
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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else
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inode->i_fop = &ecryptfs_main_fops;
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return 0;
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}
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static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
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struct super_block *sb)
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{
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struct inode *inode;
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if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
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return ERR_PTR(-EXDEV);
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if (!igrab(lower_inode))
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return ERR_PTR(-ESTALE);
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inode = iget5_locked(sb, (unsigned long)lower_inode,
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ecryptfs_inode_test, ecryptfs_inode_set,
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lower_inode);
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if (!inode) {
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iput(lower_inode);
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return ERR_PTR(-EACCES);
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}
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if (!(inode->i_state & I_NEW))
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iput(lower_inode);
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return inode;
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}
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struct inode *ecryptfs_get_inode(struct inode *lower_inode,
|
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struct super_block *sb)
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{
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struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
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|
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if (!IS_ERR(inode) && (inode->i_state & I_NEW))
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unlock_new_inode(inode);
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return inode;
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}
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|
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/**
|
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* ecryptfs_interpose
|
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* @lower_dentry: Existing dentry in the lower filesystem
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* @dentry: ecryptfs' dentry
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* @sb: ecryptfs's super_block
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*
|
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* Interposes upper and lower dentries.
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*
|
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* Returns zero on success; non-zero otherwise
|
||||
*/
|
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static int ecryptfs_interpose(struct dentry *lower_dentry,
|
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struct dentry *dentry, struct super_block *sb)
|
||||
{
|
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struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
|
||||
|
||||
if (IS_ERR(inode))
|
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return PTR_ERR(inode);
|
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d_instantiate(dentry, inode);
|
||||
|
||||
return 0;
|
||||
}
|
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|
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/**
|
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* ecryptfs_create_underlying_file
|
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* @lower_dir_inode: inode of the parent in the lower fs of the new file
|
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@ -129,7 +220,7 @@ ecryptfs_do_create(struct inode *directory_inode,
|
||||
goto out_lock;
|
||||
}
|
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rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
|
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directory_inode->i_sb, 0);
|
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directory_inode->i_sb);
|
||||
if (rc) {
|
||||
ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
|
||||
goto out_lock;
|
||||
@ -168,7 +259,8 @@ static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
|
||||
"context; rc = [%d]\n", rc);
|
||||
goto out;
|
||||
}
|
||||
rc = ecryptfs_get_lower_file(ecryptfs_dentry);
|
||||
rc = ecryptfs_get_lower_file(ecryptfs_dentry,
|
||||
ecryptfs_dentry->d_inode);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error attempting to initialize "
|
||||
"the lower file for the dentry with name "
|
||||
@ -215,102 +307,90 @@ out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* ecryptfs_lookup_and_interpose_lower - Perform a lookup
|
||||
*/
|
||||
int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
|
||||
struct dentry *lower_dentry,
|
||||
struct inode *ecryptfs_dir_inode)
|
||||
static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
|
||||
{
|
||||
struct dentry *lower_dir_dentry;
|
||||
struct vfsmount *lower_mnt;
|
||||
struct inode *lower_inode;
|
||||
struct ecryptfs_crypt_stat *crypt_stat;
|
||||
char *page_virt = NULL;
|
||||
int put_lower = 0, rc = 0;
|
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int rc;
|
||||
|
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lower_dir_dentry = lower_dentry->d_parent;
|
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lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
|
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ecryptfs_dentry->d_parent));
|
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lower_inode = lower_dentry->d_inode;
|
||||
fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
|
||||
BUG_ON(!lower_dentry->d_count);
|
||||
ecryptfs_set_dentry_private(ecryptfs_dentry,
|
||||
kmem_cache_alloc(ecryptfs_dentry_info_cache,
|
||||
GFP_KERNEL));
|
||||
if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
|
||||
rc = -ENOMEM;
|
||||
printk(KERN_ERR "%s: Out of memory whilst attempting "
|
||||
"to allocate ecryptfs_dentry_info struct\n",
|
||||
__func__);
|
||||
goto out_put;
|
||||
}
|
||||
ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
|
||||
ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
|
||||
if (!lower_dentry->d_inode) {
|
||||
/* We want to add because we couldn't find in lower */
|
||||
d_add(ecryptfs_dentry, NULL);
|
||||
goto out;
|
||||
}
|
||||
rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
|
||||
ecryptfs_dir_inode->i_sb,
|
||||
ECRYPTFS_INTERPOSE_FLAG_D_ADD);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
|
||||
__func__, rc);
|
||||
goto out;
|
||||
}
|
||||
if (S_ISDIR(lower_inode->i_mode))
|
||||
goto out;
|
||||
if (S_ISLNK(lower_inode->i_mode))
|
||||
goto out;
|
||||
if (special_file(lower_inode->i_mode))
|
||||
goto out;
|
||||
/* Released in this function */
|
||||
page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
|
||||
if (!page_virt) {
|
||||
printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
|
||||
__func__);
|
||||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
rc = ecryptfs_get_lower_file(ecryptfs_dentry);
|
||||
rc = ecryptfs_get_lower_file(dentry, inode);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error attempting to initialize "
|
||||
"the lower file for the dentry with name "
|
||||
"[%s]; rc = [%d]\n", __func__,
|
||||
ecryptfs_dentry->d_name.name, rc);
|
||||
goto out_free_kmem;
|
||||
dentry->d_name.name, rc);
|
||||
return rc;
|
||||
}
|
||||
put_lower = 1;
|
||||
crypt_stat = &ecryptfs_inode_to_private(
|
||||
ecryptfs_dentry->d_inode)->crypt_stat;
|
||||
|
||||
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
|
||||
/* TODO: lock for crypt_stat comparison */
|
||||
if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
|
||||
ecryptfs_set_default_sizes(crypt_stat);
|
||||
rc = ecryptfs_read_and_validate_header_region(page_virt,
|
||||
ecryptfs_dentry->d_inode);
|
||||
ecryptfs_set_default_sizes(crypt_stat);
|
||||
|
||||
rc = ecryptfs_read_and_validate_header_region(inode);
|
||||
ecryptfs_put_lower_file(inode);
|
||||
if (rc) {
|
||||
memset(page_virt, 0, PAGE_CACHE_SIZE);
|
||||
rc = ecryptfs_read_and_validate_xattr_region(page_virt,
|
||||
ecryptfs_dentry);
|
||||
if (rc) {
|
||||
rc = 0;
|
||||
goto out_free_kmem;
|
||||
}
|
||||
crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
|
||||
rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
|
||||
if (!rc)
|
||||
crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
|
||||
}
|
||||
ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
|
||||
out_free_kmem:
|
||||
kmem_cache_free(ecryptfs_header_cache_2, page_virt);
|
||||
goto out;
|
||||
out_put:
|
||||
dput(lower_dentry);
|
||||
mntput(lower_mnt);
|
||||
d_drop(ecryptfs_dentry);
|
||||
out:
|
||||
if (put_lower)
|
||||
ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
|
||||
|
||||
/* Must return 0 to allow non-eCryptfs files to be looked up, too */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* ecryptfs_lookup_interpose - Dentry interposition for a lookup
|
||||
*/
|
||||
static int ecryptfs_lookup_interpose(struct dentry *dentry,
|
||||
struct dentry *lower_dentry,
|
||||
struct inode *dir_inode)
|
||||
{
|
||||
struct inode *inode, *lower_inode = lower_dentry->d_inode;
|
||||
struct ecryptfs_dentry_info *dentry_info;
|
||||
struct vfsmount *lower_mnt;
|
||||
int rc = 0;
|
||||
|
||||
lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
|
||||
fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
|
||||
BUG_ON(!lower_dentry->d_count);
|
||||
|
||||
dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
|
||||
ecryptfs_set_dentry_private(dentry, dentry_info);
|
||||
if (!dentry_info) {
|
||||
printk(KERN_ERR "%s: Out of memory whilst attempting "
|
||||
"to allocate ecryptfs_dentry_info struct\n",
|
||||
__func__);
|
||||
dput(lower_dentry);
|
||||
mntput(lower_mnt);
|
||||
d_drop(dentry);
|
||||
return -ENOMEM;
|
||||
}
|
||||
ecryptfs_set_dentry_lower(dentry, lower_dentry);
|
||||
ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
|
||||
|
||||
if (!lower_dentry->d_inode) {
|
||||
/* We want to add because we couldn't find in lower */
|
||||
d_add(dentry, NULL);
|
||||
return 0;
|
||||
}
|
||||
inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
|
||||
if (IS_ERR(inode)) {
|
||||
printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
|
||||
__func__, PTR_ERR(inode));
|
||||
return PTR_ERR(inode);
|
||||
}
|
||||
if (S_ISREG(inode->i_mode)) {
|
||||
rc = ecryptfs_i_size_read(dentry, inode);
|
||||
if (rc) {
|
||||
make_bad_inode(inode);
|
||||
return rc;
|
||||
}
|
||||
}
|
||||
|
||||
if (inode->i_state & I_NEW)
|
||||
unlock_new_inode(inode);
|
||||
d_add(dentry, inode);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
@ -353,12 +433,12 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
|
||||
goto out_d_drop;
|
||||
}
|
||||
if (lower_dentry->d_inode)
|
||||
goto lookup_and_interpose;
|
||||
goto interpose;
|
||||
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
||||
ecryptfs_dentry->d_sb)->mount_crypt_stat;
|
||||
if (!(mount_crypt_stat
|
||||
&& (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
|
||||
goto lookup_and_interpose;
|
||||
goto interpose;
|
||||
dput(lower_dentry);
|
||||
rc = ecryptfs_encrypt_and_encode_filename(
|
||||
&encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
|
||||
@ -381,9 +461,9 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
|
||||
encrypted_and_encoded_name);
|
||||
goto out_d_drop;
|
||||
}
|
||||
lookup_and_interpose:
|
||||
rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
|
||||
ecryptfs_dir_inode);
|
||||
interpose:
|
||||
rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
|
||||
ecryptfs_dir_inode);
|
||||
goto out;
|
||||
out_d_drop:
|
||||
d_drop(ecryptfs_dentry);
|
||||
@ -411,7 +491,7 @@ static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
|
||||
lower_new_dentry);
|
||||
if (rc || !lower_new_dentry->d_inode)
|
||||
goto out_lock;
|
||||
rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
|
||||
rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
|
||||
if (rc)
|
||||
goto out_lock;
|
||||
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
||||
@ -478,7 +558,7 @@ static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
|
||||
kfree(encoded_symname);
|
||||
if (rc || !lower_dentry->d_inode)
|
||||
goto out_lock;
|
||||
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
||||
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
|
||||
if (rc)
|
||||
goto out_lock;
|
||||
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
||||
@ -502,7 +582,7 @@ static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
||||
rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
|
||||
if (rc || !lower_dentry->d_inode)
|
||||
goto out;
|
||||
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
||||
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
|
||||
if (rc)
|
||||
goto out;
|
||||
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
||||
@ -550,7 +630,7 @@ ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
|
||||
rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
|
||||
if (rc || !lower_dentry->d_inode)
|
||||
goto out;
|
||||
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
||||
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
|
||||
if (rc)
|
||||
goto out;
|
||||
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
||||
@ -750,7 +830,7 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia,
|
||||
lower_ia->ia_valid &= ~ATTR_SIZE;
|
||||
return 0;
|
||||
}
|
||||
rc = ecryptfs_get_lower_file(dentry);
|
||||
rc = ecryptfs_get_lower_file(dentry, inode);
|
||||
if (rc)
|
||||
return rc;
|
||||
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
|
||||
@ -906,7 +986,7 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
|
||||
|
||||
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
||||
dentry->d_sb)->mount_crypt_stat;
|
||||
rc = ecryptfs_get_lower_file(dentry);
|
||||
rc = ecryptfs_get_lower_file(dentry, inode);
|
||||
if (rc) {
|
||||
mutex_unlock(&crypt_stat->cs_mutex);
|
||||
goto out;
|
||||
@ -1079,21 +1159,6 @@ out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
|
||||
{
|
||||
if ((ecryptfs_inode_to_lower(inode)
|
||||
== (struct inode *)candidate_lower_inode))
|
||||
return 1;
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
|
||||
int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
|
||||
{
|
||||
ecryptfs_init_inode(inode, (struct inode *)lower_inode);
|
||||
return 0;
|
||||
}
|
||||
|
||||
const struct inode_operations ecryptfs_symlink_iops = {
|
||||
.readlink = ecryptfs_readlink,
|
||||
.follow_link = ecryptfs_follow_link,
|
||||
|
||||
@ -135,12 +135,12 @@ static int ecryptfs_init_lower_file(struct dentry *dentry,
|
||||
return rc;
|
||||
}
|
||||
|
||||
int ecryptfs_get_lower_file(struct dentry *dentry)
|
||||
int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode)
|
||||
{
|
||||
struct ecryptfs_inode_info *inode_info =
|
||||
ecryptfs_inode_to_private(dentry->d_inode);
|
||||
struct ecryptfs_inode_info *inode_info;
|
||||
int count, rc = 0;
|
||||
|
||||
inode_info = ecryptfs_inode_to_private(inode);
|
||||
mutex_lock(&inode_info->lower_file_mutex);
|
||||
count = atomic_inc_return(&inode_info->lower_file_count);
|
||||
if (WARN_ON_ONCE(count < 1))
|
||||
@ -168,75 +168,6 @@ void ecryptfs_put_lower_file(struct inode *inode)
|
||||
}
|
||||
}
|
||||
|
||||
static struct inode *ecryptfs_get_inode(struct inode *lower_inode,
|
||||
struct super_block *sb)
|
||||
{
|
||||
struct inode *inode;
|
||||
int rc = 0;
|
||||
|
||||
if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) {
|
||||
rc = -EXDEV;
|
||||
goto out;
|
||||
}
|
||||
if (!igrab(lower_inode)) {
|
||||
rc = -ESTALE;
|
||||
goto out;
|
||||
}
|
||||
inode = iget5_locked(sb, (unsigned long)lower_inode,
|
||||
ecryptfs_inode_test, ecryptfs_inode_set,
|
||||
lower_inode);
|
||||
if (!inode) {
|
||||
rc = -EACCES;
|
||||
iput(lower_inode);
|
||||
goto out;
|
||||
}
|
||||
if (inode->i_state & I_NEW)
|
||||
unlock_new_inode(inode);
|
||||
else
|
||||
iput(lower_inode);
|
||||
if (S_ISLNK(lower_inode->i_mode))
|
||||
inode->i_op = &ecryptfs_symlink_iops;
|
||||
else if (S_ISDIR(lower_inode->i_mode))
|
||||
inode->i_op = &ecryptfs_dir_iops;
|
||||
if (S_ISDIR(lower_inode->i_mode))
|
||||
inode->i_fop = &ecryptfs_dir_fops;
|
||||
if (special_file(lower_inode->i_mode))
|
||||
init_special_inode(inode, lower_inode->i_mode,
|
||||
lower_inode->i_rdev);
|
||||
fsstack_copy_attr_all(inode, lower_inode);
|
||||
/* This size will be overwritten for real files w/ headers and
|
||||
* other metadata */
|
||||
fsstack_copy_inode_size(inode, lower_inode);
|
||||
return inode;
|
||||
out:
|
||||
return ERR_PTR(rc);
|
||||
}
|
||||
|
||||
/**
|
||||
* ecryptfs_interpose
|
||||
* @lower_dentry: Existing dentry in the lower filesystem
|
||||
* @dentry: ecryptfs' dentry
|
||||
* @sb: ecryptfs's super_block
|
||||
* @flags: flags to govern behavior of interpose procedure
|
||||
*
|
||||
* Interposes upper and lower dentries.
|
||||
*
|
||||
* Returns zero on success; non-zero otherwise
|
||||
*/
|
||||
int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
|
||||
struct super_block *sb, u32 flags)
|
||||
{
|
||||
struct inode *lower_inode = lower_dentry->d_inode;
|
||||
struct inode *inode = ecryptfs_get_inode(lower_inode, sb);
|
||||
if (IS_ERR(inode))
|
||||
return PTR_ERR(inode);
|
||||
if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD)
|
||||
d_add(dentry, inode);
|
||||
else
|
||||
d_instantiate(dentry, inode);
|
||||
return 0;
|
||||
}
|
||||
|
||||
enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
|
||||
ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
|
||||
ecryptfs_opt_ecryptfs_key_bytes,
|
||||
@ -704,13 +635,8 @@ static struct ecryptfs_cache_info {
|
||||
.size = sizeof(struct ecryptfs_sb_info),
|
||||
},
|
||||
{
|
||||
.cache = &ecryptfs_header_cache_1,
|
||||
.name = "ecryptfs_headers_1",
|
||||
.size = PAGE_CACHE_SIZE,
|
||||
},
|
||||
{
|
||||
.cache = &ecryptfs_header_cache_2,
|
||||
.name = "ecryptfs_headers_2",
|
||||
.cache = &ecryptfs_header_cache,
|
||||
.name = "ecryptfs_headers",
|
||||
.size = PAGE_CACHE_SIZE,
|
||||
},
|
||||
{
|
||||
|
||||
@ -92,22 +92,6 @@ static void ecryptfs_destroy_inode(struct inode *inode)
|
||||
call_rcu(&inode->i_rcu, ecryptfs_i_callback);
|
||||
}
|
||||
|
||||
/**
|
||||
* ecryptfs_init_inode
|
||||
* @inode: The ecryptfs inode
|
||||
*
|
||||
* Set up the ecryptfs inode.
|
||||
*/
|
||||
void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode)
|
||||
{
|
||||
ecryptfs_set_inode_lower(inode, lower_inode);
|
||||
inode->i_ino = lower_inode->i_ino;
|
||||
inode->i_version++;
|
||||
inode->i_op = &ecryptfs_main_iops;
|
||||
inode->i_fop = &ecryptfs_main_fops;
|
||||
inode->i_mapping->a_ops = &ecryptfs_aops;
|
||||
}
|
||||
|
||||
/**
|
||||
* ecryptfs_statfs
|
||||
* @sb: The ecryptfs super block
|
||||
|
||||
Loading…
Reference in New Issue
Block a user