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

fs/ecryptfs/crypto.c

@@ -1024,25 +1024,25 @@ int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry)
 }
 
 /**
- * contains_ecryptfs_marker - check for the ecryptfs marker
+ * ecryptfs_validate_marker - check for the ecryptfs marker
  * @data: The data block in which to check
  *
- * Returns one if marker found; zero if not found
+ * Returns zero if marker found; -EINVAL if not found
  */
-static int contains_ecryptfs_marker(char *data)
+static int ecryptfs_validate_marker(char *data)
 {
 	u32 m_1, m_2;
 
 	m_1 = get_unaligned_be32(data);
 	m_2 = get_unaligned_be32(data + 4);
 	if ((m_1 ^ MAGIC_ECRYPTFS_MARKER) == m_2)
-		return 1;
+		return 0;
 	ecryptfs_printk(KERN_DEBUG, "m_1 = [0x%.8x]; m_2 = [0x%.8x]; "
 			"MAGIC_ECRYPTFS_MARKER = [0x%.8x]\n", m_1, m_2,
 			MAGIC_ECRYPTFS_MARKER);
 	ecryptfs_printk(KERN_DEBUG, "(m_1 ^ MAGIC_ECRYPTFS_MARKER) = "
 			"[0x%.8x]\n", (m_1 ^ MAGIC_ECRYPTFS_MARKER));
-	return 0;
+	return -EINVAL;
 }
 
 struct ecryptfs_flag_map_elem {
@@ -1201,27 +1201,19 @@ int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code)
 	return rc;
 }
 
-int ecryptfs_read_and_validate_header_region(char *data,
-					     struct inode *ecryptfs_inode)
+int ecryptfs_read_and_validate_header_region(struct inode *inode)
 {
-	struct ecryptfs_crypt_stat *crypt_stat =
-		&(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
+	u8 file_size[ECRYPTFS_SIZE_AND_MARKER_BYTES];
+	u8 *marker = file_size + ECRYPTFS_FILE_SIZE_BYTES;
 	int rc;
 
-	if (crypt_stat->extent_size == 0)
-		crypt_stat->extent_size = ECRYPTFS_DEFAULT_EXTENT_SIZE;
-	rc = ecryptfs_read_lower(data, 0, crypt_stat->extent_size,
-				 ecryptfs_inode);
-	if (rc < 0) {
-		printk(KERN_ERR "%s: Error reading header region; rc = [%d]\n",
-		       __func__, rc);
-		goto out;
-	}
-	if (!contains_ecryptfs_marker(data + ECRYPTFS_FILE_SIZE_BYTES)) {
-		rc = -EINVAL;
-	} else
-		rc = 0;
-out:
+	rc = ecryptfs_read_lower(file_size, 0, ECRYPTFS_SIZE_AND_MARKER_BYTES,
+				 inode);
+	if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
+		return rc >= 0 ? -EINVAL : rc;
+	rc = ecryptfs_validate_marker(marker);
+	if (!rc)
+		ecryptfs_i_size_init(file_size, inode);
 	return rc;
 }
 
@@ -1242,8 +1234,7 @@ ecryptfs_write_header_metadata(char *virt,
 	(*written) = 6;
 }
 
-struct kmem_cache *ecryptfs_header_cache_1;
-struct kmem_cache *ecryptfs_header_cache_2;
+struct kmem_cache *ecryptfs_header_cache;
 
 /**
  * ecryptfs_write_headers_virt
@@ -1496,11 +1487,9 @@ static int ecryptfs_read_headers_virt(char *page_virt,
 	crypt_stat->mount_crypt_stat = &ecryptfs_superblock_to_private(
 		ecryptfs_dentry->d_sb)->mount_crypt_stat;
 	offset = ECRYPTFS_FILE_SIZE_BYTES;
-	rc = contains_ecryptfs_marker(page_virt + offset);
-	if (rc == 0) {
-		rc = -EINVAL;
+	rc = ecryptfs_validate_marker(page_virt + offset);
+	if (rc)
 		goto out;
-	}
 	if (!(crypt_stat->flags & ECRYPTFS_I_SIZE_INITIALIZED))
 		ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
 	offset += MAGIC_ECRYPTFS_MARKER_SIZE_BYTES;
@@ -1567,20 +1556,21 @@ int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode)
 	return rc;
 }
 
-int ecryptfs_read_and_validate_xattr_region(char *page_virt,
-					    struct dentry *ecryptfs_dentry)
+int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
+					    struct inode *inode)
 {
+	u8 file_size[ECRYPTFS_SIZE_AND_MARKER_BYTES];
+	u8 *marker = file_size + ECRYPTFS_FILE_SIZE_BYTES;
 	int rc;
 
-	rc = ecryptfs_read_xattr_region(page_virt, ecryptfs_dentry->d_inode);
-	if (rc)
-		goto out;
-	if (!contains_ecryptfs_marker(page_virt	+ ECRYPTFS_FILE_SIZE_BYTES)) {
-		printk(KERN_WARNING "Valid data found in [%s] xattr, but "
-			"the marker is invalid\n", ECRYPTFS_XATTR_NAME);
-		rc = -EINVAL;
-	}
-out:
+	rc = ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
+				     ECRYPTFS_XATTR_NAME, file_size,
+				     ECRYPTFS_SIZE_AND_MARKER_BYTES);
+	if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
+		return rc >= 0 ? -EINVAL : rc;
+	rc = ecryptfs_validate_marker(marker);
+	if (!rc)
+		ecryptfs_i_size_init(file_size, inode);
 	return rc;
 }
 
@@ -1610,7 +1600,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
 	ecryptfs_copy_mount_wide_flags_to_inode_flags(crypt_stat,
 						      mount_crypt_stat);
 	/* Read the first page from the underlying file */
-	page_virt = kmem_cache_alloc(ecryptfs_header_cache_1, GFP_USER);
+	page_virt = kmem_cache_alloc(ecryptfs_header_cache, GFP_USER);
 	if (!page_virt) {
 		rc = -ENOMEM;
 		printk(KERN_ERR "%s: Unable to allocate page_virt\n",
@@ -1655,7 +1645,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
 out:
 	if (page_virt) {
 		memset(page_virt, 0, PAGE_CACHE_SIZE);
-		kmem_cache_free(ecryptfs_header_cache_1, page_virt);
+		kmem_cache_free(ecryptfs_header_cache, page_virt);
 	}
 	return rc;
 }

fs/ecryptfs/ecryptfs_kernel.h

@@ -200,6 +200,8 @@ ecryptfs_get_key_payload_data(struct key *key)
 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8	/* 4*2 */
 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
+#define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \
+					+ MAGIC_ECRYPTFS_MARKER_SIZE_BYTES)
 #define ECRYPTFS_DEFAULT_CIPHER "aes"
 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
 #define ECRYPTFS_DEFAULT_HASH "md5"
@@ -603,8 +605,7 @@ extern struct kmem_cache *ecryptfs_file_info_cache;
 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 extern struct kmem_cache *ecryptfs_inode_info_cache;
 extern struct kmem_cache *ecryptfs_sb_info_cache;
-extern struct kmem_cache *ecryptfs_header_cache_1;
-extern struct kmem_cache *ecryptfs_header_cache_2;
+extern struct kmem_cache *ecryptfs_header_cache;
 extern struct kmem_cache *ecryptfs_xattr_cache;
 extern struct kmem_cache *ecryptfs_key_record_cache;
 extern struct kmem_cache *ecryptfs_key_sig_cache;
@@ -625,14 +626,9 @@ struct ecryptfs_open_req {
 	struct list_head kthread_ctl_list;
 };
 
-#define ECRYPTFS_INTERPOSE_FLAG_D_ADD                 0x00000001
-int ecryptfs_interpose(struct dentry *hidden_dentry,
-		       struct dentry *this_dentry, struct super_block *sb,
-		       u32 flags);
+struct inode *ecryptfs_get_inode(struct inode *lower_inode,
+				 struct super_block *sb);
 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
-int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
-					struct dentry *lower_dentry,
-					struct inode *ecryptfs_dir_inode);
 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
 					 size_t *decrypted_name_size,
 					 struct dentry *ecryptfs_dentry,
@@ -664,10 +660,9 @@ int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
 void ecryptfs_write_crypt_stat_flags(char *page_virt,
 				     struct ecryptfs_crypt_stat *crypt_stat,
 				     size_t *written);
-int ecryptfs_read_and_validate_header_region(char *data,
-					     struct inode *ecryptfs_inode);
-int ecryptfs_read_and_validate_xattr_region(char *page_virt,
-					    struct dentry *ecryptfs_dentry);
+int ecryptfs_read_and_validate_header_region(struct inode *inode);
+int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
+					    struct inode *inode);
 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
@@ -679,9 +674,6 @@ int
 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 			  unsigned char *src, struct dentry *ecryptfs_dentry);
 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
-int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
-int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
-void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
 ssize_t
 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
 			void *value, size_t size);
@@ -761,7 +753,7 @@ int ecryptfs_privileged_open(struct file **lower_file,
 			     struct dentry *lower_dentry,
 			     struct vfsmount *lower_mnt,
 			     const struct cred *cred);
-int ecryptfs_get_lower_file(struct dentry *ecryptfs_dentry);
+int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
 void ecryptfs_put_lower_file(struct inode *inode);
 int
 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,

fs/ecryptfs/file.c

@@ -191,7 +191,7 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
 				      | ECRYPTFS_ENCRYPTED);
 	}
 	mutex_unlock(&crypt_stat->cs_mutex);
-	rc = ecryptfs_get_lower_file(ecryptfs_dentry);
+	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
 	if (rc) {
 		printk(KERN_ERR "%s: Error attempting to initialize "
 			"the lower file for the dentry with name "

fs/ecryptfs/main.c

@@ -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,
 	},
 	{

fs/ecryptfs/super.c

@@ -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