1 files changed, 346 insertions, 304 deletions

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index d25ac9500a9..1b119d3bf92 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -30,12 +30,13 @@
 #include <linux/namei.h>
 #include <linux/skbuff.h>
 #include <linux/crypto.h>
-#include <linux/netlink.h>
 #include <linux/mount.h>
 #include <linux/pagemap.h>
 #include <linux/key.h>
 #include <linux/parser.h>
 #include <linux/fs_stack.h>
+#include <linux/slab.h>
+#include <linux/magic.h>
 #include "ecryptfs_kernel.h"
 
 /**
@@ -49,8 +50,7 @@ MODULE_PARM_DESC(ecryptfs_verbosity,
 		 "0, which is Quiet)");
 
 /**
- * Module parameter that defines the number of netlink message buffer
- * elements
+ * Module parameter that defines the number of message buffer elements
  */
 unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
 
@@ -60,9 +60,9 @@ MODULE_PARM_DESC(ecryptfs_message_buf_len,
 
 /**
  * Module parameter that defines the maximum guaranteed amount of time to wait
- * for a response through netlink.  The actual sleep time will be, more than
+ * for a response from ecryptfsd.  The actual sleep time will be, more than
  * likely, a small amount greater than this specified value, but only less if
- * the netlink message successfully arrives.
+ * the message successfully arrives.
  */
 signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
 
@@ -83,8 +83,6 @@ module_param(ecryptfs_number_of_users, uint, 0);
 MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
 		 "concurrent users of eCryptfs");
 
-unsigned int ecryptfs_transport = ECRYPTFS_DEFAULT_TRANSPORT;
-
 void __ecryptfs_printk(const char *fmt, ...)
 {
 	va_list args;
@@ -98,7 +96,7 @@ void __ecryptfs_printk(const char *fmt, ...)
 }
 
 /**
- * ecryptfs_init_persistent_file
+ * ecryptfs_init_lower_file
  * @ecryptfs_dentry: Fully initialized eCryptfs dentry object, with
  *                   the lower dentry and the lower mount set
  *
@@ -106,133 +104,81 @@ void __ecryptfs_printk(const char *fmt, ...)
  * inode. All I/O operations to the lower inode occur through that
  * file. When the first eCryptfs dentry that interposes with the first
  * lower dentry for that inode is created, this function creates the
- * persistent file struct and associates it with the eCryptfs
- * inode. When the eCryptfs inode is destroyed, the file is closed.
+ * lower file struct and associates it with the eCryptfs
+ * inode. When all eCryptfs files associated with the inode are released, the
+ * file is closed.
  *
- * The persistent file will be opened with read/write permissions, if
+ * The lower file will be opened with read/write permissions, if
  * possible. Otherwise, it is opened read-only.
  *
- * This function does nothing if a lower persistent file is already
+ * This function does nothing if a lower file is already
  * associated with the eCryptfs inode.
  *
  * Returns zero on success; non-zero otherwise
  */
-static int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
+static int ecryptfs_init_lower_file(struct dentry *dentry,
+				    struct file **lower_file)
 {
-	struct ecryptfs_inode_info *inode_info =
-		ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
-	int rc = 0;
+	const struct cred *cred = current_cred();
+	struct path *path = ecryptfs_dentry_to_lower_path(dentry);
+	int rc;
 
-	mutex_lock(&inode_info->lower_file_mutex);
-	if (!inode_info->lower_file) {
-		struct dentry *lower_dentry;
-		struct vfsmount *lower_mnt =
-			ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
-
-		lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
-		/* Corresponding dput() and mntput() are done when the
-		 * persistent file is fput() when the eCryptfs inode
-		 * is destroyed. */
-		dget(lower_dentry);
-		mntget(lower_mnt);
-		inode_info->lower_file = dentry_open(lower_dentry,
-						     lower_mnt,
-						     (O_RDWR | O_LARGEFILE));
-		if (IS_ERR(inode_info->lower_file)) {
-			dget(lower_dentry);
-			mntget(lower_mnt);
-			inode_info->lower_file = dentry_open(lower_dentry,
-							     lower_mnt,
-							     (O_RDONLY
-							      | O_LARGEFILE));
-		}
-		if (IS_ERR(inode_info->lower_file)) {
-			printk(KERN_ERR "Error opening lower persistent file "
-			       "for lower_dentry [0x%p] and lower_mnt [0x%p]\n",
-			       lower_dentry, lower_mnt);
-			rc = PTR_ERR(inode_info->lower_file);
-			inode_info->lower_file = NULL;
-		}
+	rc = ecryptfs_privileged_open(lower_file, path->dentry, path->mnt,
+				      cred);
+	if (rc) {
+		printk(KERN_ERR "Error opening lower file "
+		       "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
+		       "rc = [%d]\n", path->dentry, path->mnt, rc);
+		(*lower_file) = NULL;
 	}
-	mutex_unlock(&inode_info->lower_file_mutex);
 	return rc;
 }
 
-/**
- * ecryptfs_interpose
- * @lower_dentry: Existing dentry in the lower filesystem
- * @dentry: ecryptfs' dentry
- * @sb: ecryptfs's super_block
- * @flag: If set to true, then d_add is called, else d_instantiate is called
- *
- * 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, int flag)
+int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode)
 {
-	struct inode *lower_inode;
-	struct inode *inode;
-	int rc = 0;
+	struct ecryptfs_inode_info *inode_info;
+	int count, rc = 0;
 
-	lower_inode = lower_dentry->d_inode;
-	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);
-	dentry->d_op = &ecryptfs_dops;
-	if (flag)
-		d_add(dentry, inode);
-	else
-		d_instantiate(dentry, inode);
-	fsstack_copy_attr_all(inode, lower_inode, NULL);
-	/* This size will be overwritten for real files w/ headers and
-	 * other metadata */
-	fsstack_copy_inode_size(inode, lower_inode);
-	rc = ecryptfs_init_persistent_file(dentry);
-	if (rc) {
-		printk(KERN_ERR "%s: Error attempting to initialize the "
-		       "persistent file for the dentry with name [%s]; "
-		       "rc = [%d]\n", __FUNCTION__, dentry->d_name.name, rc);
-		goto out;
+	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))
+		rc = -EINVAL;
+	else if (count == 1) {
+		rc = ecryptfs_init_lower_file(dentry,
+					      &inode_info->lower_file);
+		if (rc)
+			atomic_set(&inode_info->lower_file_count, 0);
 	}
-out:
+	mutex_unlock(&inode_info->lower_file_mutex);
 	return rc;
 }
 
+void ecryptfs_put_lower_file(struct inode *inode)
+{
+	struct ecryptfs_inode_info *inode_info;
+
+	inode_info = ecryptfs_inode_to_private(inode);
+	if (atomic_dec_and_mutex_lock(&inode_info->lower_file_count,
+				      &inode_info->lower_file_mutex)) {
+		filemap_write_and_wait(inode->i_mapping);
+		fput(inode_info->lower_file);
+		inode_info->lower_file = NULL;
+		mutex_unlock(&inode_info->lower_file_mutex);
+	}
+}
+
 enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
        ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
        ecryptfs_opt_ecryptfs_key_bytes,
        ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
-       ecryptfs_opt_encrypted_view, ecryptfs_opt_err };
+       ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
+       ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
+       ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
+       ecryptfs_opt_check_dev_ruid,
+       ecryptfs_opt_err };
 
-static match_table_t tokens = {
+static const match_table_t tokens = {
 	{ecryptfs_opt_sig, "sig=%s"},
 	{ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
 	{ecryptfs_opt_cipher, "cipher=%s"},
@@ -241,6 +187,12 @@ static match_table_t tokens = {
 	{ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
 	{ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"},
 	{ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"},
+	{ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"},
+	{ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
+	{ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
+	{ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
+	{ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"},
+	{ecryptfs_opt_check_dev_ruid, "ecryptfs_check_dev_ruid"},
 	{ecryptfs_opt_err, NULL}
 };
 
@@ -248,24 +200,27 @@ static int ecryptfs_init_global_auth_toks(
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
 {
 	struct ecryptfs_global_auth_tok *global_auth_tok;
+	struct ecryptfs_auth_tok *auth_tok;
 	int rc = 0;
 
 	list_for_each_entry(global_auth_tok,
 			    &mount_crypt_stat->global_auth_tok_list,
 			    mount_crypt_stat_list) {
 		rc = ecryptfs_keyring_auth_tok_for_sig(
-			&global_auth_tok->global_auth_tok_key,
-			&global_auth_tok->global_auth_tok,
+			&global_auth_tok->global_auth_tok_key, &auth_tok,
 			global_auth_tok->sig);
 		if (rc) {
 			printk(KERN_ERR "Could not find valid key in user "
 			       "session keyring for sig specified in mount "
 			       "option: [%s]\n", global_auth_tok->sig);
 			global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
-			rc = 0;
-		} else
+			goto out;
+		} else {
 			global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
+			up_write(&(global_auth_tok->global_auth_tok_key)->sem);
+		}
 	}
+out:
 	return rc;
 }
 
@@ -282,7 +237,8 @@ static void ecryptfs_init_mount_crypt_stat(
 /**
  * ecryptfs_parse_options
  * @sb: The ecryptfs super block
- * @options: The options pased to the kernel
+ * @options: The options passed to the kernel
+ * @check_ruid: set to 1 if device uid should be checked against the ruid
  *
  * Parse mount options:
  * debug=N 	   - ecryptfs_verbosity level for debug output
@@ -298,23 +254,34 @@ static void ecryptfs_init_mount_crypt_stat(
  *
  * Returns zero on success; non-zero on error
  */
-static int ecryptfs_parse_options(struct super_block *sb, char *options)
+static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
+				  uid_t *check_ruid)
 {
 	char *p;
 	int rc = 0;
 	int sig_set = 0;
 	int cipher_name_set = 0;
+	int fn_cipher_name_set = 0;
 	int cipher_key_bytes;
 	int cipher_key_bytes_set = 0;
+	int fn_cipher_key_bytes;
+	int fn_cipher_key_bytes_set = 0;
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
-		&ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
+		&sbi->mount_crypt_stat;
 	substring_t args[MAX_OPT_ARGS];
 	int token;
 	char *sig_src;
 	char *cipher_name_dst;
 	char *cipher_name_src;
+	char *fn_cipher_name_dst;
+	char *fn_cipher_name_src;
+	char *fnek_dst;
+	char *fnek_src;
 	char *cipher_key_bytes_src;
-	int cipher_name_len;
+	char *fn_cipher_key_bytes_src;
+	u8 cipher_code;
+
+	*check_ruid = 0;
 
 	if (!options) {
 		rc = -EINVAL;
@@ -330,7 +297,7 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
 		case ecryptfs_opt_ecryptfs_sig:
 			sig_src = args[0].from;
 			rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
-							  sig_src);
+							  sig_src, 0);
 			if (rc) {
 				printk(KERN_ERR "Error attempting to register "
 				       "global sig; rc = [%d]\n", rc);
@@ -346,10 +313,7 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
 				global_default_cipher_name;
 			strncpy(cipher_name_dst, cipher_name_src,
 				ECRYPTFS_MAX_CIPHER_NAME_SIZE);
-			ecryptfs_printk(KERN_DEBUG,
-					"The mount_crypt_stat "
-					"global_default_cipher_name set to: "
-					"[%s]\n", cipher_name_dst);
+			cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
 			cipher_name_set = 1;
 			break;
 		case ecryptfs_opt_ecryptfs_key_bytes:
@@ -359,11 +323,6 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
 						   &cipher_key_bytes_src, 0);
 			mount_crypt_stat->global_default_cipher_key_size =
 				cipher_key_bytes;
-			ecryptfs_printk(KERN_DEBUG,
-					"The mount_crypt_stat "
-					"global_default_cipher_key_size "
-					"set to: [%d]\n", mount_crypt_stat->
-					global_default_cipher_key_size);
 			cipher_key_bytes_set = 1;
 			break;
 		case ecryptfs_opt_passthrough:
@@ -380,11 +339,62 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
 			mount_crypt_stat->flags |=
 				ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
 			break;
+		case ecryptfs_opt_fnek_sig:
+			fnek_src = args[0].from;
+			fnek_dst =
+				mount_crypt_stat->global_default_fnek_sig;
+			strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
+			mount_crypt_stat->global_default_fnek_sig[
+				ECRYPTFS_SIG_SIZE_HEX] = '\0';
+			rc = ecryptfs_add_global_auth_tok(
+				mount_crypt_stat,
+				mount_crypt_stat->global_default_fnek_sig,
+				ECRYPTFS_AUTH_TOK_FNEK);
+			if (rc) {
+				printk(KERN_ERR "Error attempting to register "
+				       "global fnek sig [%s]; rc = [%d]\n",
+				       mount_crypt_stat->global_default_fnek_sig,
+				       rc);
+				goto out;
+			}
+			mount_crypt_stat->flags |=
+				(ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
+				 | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
+			break;
+		case ecryptfs_opt_fn_cipher:
+			fn_cipher_name_src = args[0].from;
+			fn_cipher_name_dst =
+				mount_crypt_stat->global_default_fn_cipher_name;
+			strncpy(fn_cipher_name_dst, fn_cipher_name_src,
+				ECRYPTFS_MAX_CIPHER_NAME_SIZE);
+			mount_crypt_stat->global_default_fn_cipher_name[
+				ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
+			fn_cipher_name_set = 1;
+			break;
+		case ecryptfs_opt_fn_cipher_key_bytes:
+			fn_cipher_key_bytes_src = args[0].from;
+			fn_cipher_key_bytes =
+				(int)simple_strtol(fn_cipher_key_bytes_src,
+						   &fn_cipher_key_bytes_src, 0);
+			mount_crypt_stat->global_default_fn_cipher_key_bytes =
+				fn_cipher_key_bytes;
+			fn_cipher_key_bytes_set = 1;
+			break;
+		case ecryptfs_opt_unlink_sigs:
+			mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
+			break;
+		case ecryptfs_opt_mount_auth_tok_only:
+			mount_crypt_stat->flags |=
+				ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
+			break;
+		case ecryptfs_opt_check_dev_ruid:
+			*check_ruid = 1;
+			break;
 		case ecryptfs_opt_err:
 		default:
-			ecryptfs_printk(KERN_WARNING,
-					"eCryptfs: unrecognized option '%s'\n",
-					p);
+			printk(KERN_WARNING
+			       "%s: eCryptfs: unrecognized option [%s]\n",
+			       __func__, p);
 		}
 	}
 	if (!sig_set) {
@@ -395,188 +405,202 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
 		goto out;
 	}
 	if (!cipher_name_set) {
-		cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
-		if (unlikely(cipher_name_len
-			     >= ECRYPTFS_MAX_CIPHER_NAME_SIZE)) {
-			rc = -EINVAL;
-			BUG();
-			goto out;
-		}
-		memcpy(mount_crypt_stat->global_default_cipher_name,
-		       ECRYPTFS_DEFAULT_CIPHER, cipher_name_len);
-		mount_crypt_stat->global_default_cipher_name[cipher_name_len]
-		    = '\0';
+		int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
+
+		BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE);
+		strcpy(mount_crypt_stat->global_default_cipher_name,
+		       ECRYPTFS_DEFAULT_CIPHER);
 	}
-	if (!cipher_key_bytes_set) {
+	if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
+	    && !fn_cipher_name_set)
+		strcpy(mount_crypt_stat->global_default_fn_cipher_name,
+		       mount_crypt_stat->global_default_cipher_name);
+	if (!cipher_key_bytes_set)
 		mount_crypt_stat->global_default_cipher_key_size = 0;
+	if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
+	    && !fn_cipher_key_bytes_set)
+		mount_crypt_stat->global_default_fn_cipher_key_bytes =
+			mount_crypt_stat->global_default_cipher_key_size;
+
+	cipher_code = ecryptfs_code_for_cipher_string(
+		mount_crypt_stat->global_default_cipher_name,
+		mount_crypt_stat->global_default_cipher_key_size);
+	if (!cipher_code) {
+		ecryptfs_printk(KERN_ERR,
+				"eCryptfs doesn't support cipher: %s",
+				mount_crypt_stat->global_default_cipher_name);
+		rc = -EINVAL;
+		goto out;
 	}
+
 	mutex_lock(&key_tfm_list_mutex);
 	if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
-				 NULL))
+				 NULL)) {
 		rc = ecryptfs_add_new_key_tfm(
 			NULL, mount_crypt_stat->global_default_cipher_name,
 			mount_crypt_stat->global_default_cipher_key_size);
-	mutex_unlock(&key_tfm_list_mutex);
-	if (rc) {
-		printk(KERN_ERR "Error attempting to initialize cipher with "
-		       "name = [%s] and key size = [%td]; rc = [%d]\n",
-		       mount_crypt_stat->global_default_cipher_name,
-		       mount_crypt_stat->global_default_cipher_key_size, rc);
-		rc = -EINVAL;
-		goto out;
+		if (rc) {
+			printk(KERN_ERR "Error attempting to initialize "
+			       "cipher with name = [%s] and key size = [%td]; "
+			       "rc = [%d]\n",
+			       mount_crypt_stat->global_default_cipher_name,
+			       mount_crypt_stat->global_default_cipher_key_size,
+			       rc);
+			rc = -EINVAL;
+			mutex_unlock(&key_tfm_list_mutex);
+			goto out;
+		}
+	}
+	if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
+	    && !ecryptfs_tfm_exists(
+		    mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
+		rc = ecryptfs_add_new_key_tfm(
+			NULL, mount_crypt_stat->global_default_fn_cipher_name,
+			mount_crypt_stat->global_default_fn_cipher_key_bytes);
+		if (rc) {
+			printk(KERN_ERR "Error attempting to initialize "
+			       "cipher with name = [%s] and key size = [%td]; "
+			       "rc = [%d]\n",
+			       mount_crypt_stat->global_default_fn_cipher_name,
+			       mount_crypt_stat->global_default_fn_cipher_key_bytes,
+			       rc);
+			rc = -EINVAL;
+			mutex_unlock(&key_tfm_list_mutex);
+			goto out;
+		}
 	}
+	mutex_unlock(&key_tfm_list_mutex);
 	rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
-	if (rc) {
+	if (rc)
 		printk(KERN_WARNING "One or more global auth toks could not "
 		       "properly register; rc = [%d]\n", rc);
-	}
-	rc = 0;
 out:
 	return rc;
 }
 
 struct kmem_cache *ecryptfs_sb_info_cache;
+static struct file_system_type ecryptfs_fs_type;
 
 /**
- * ecryptfs_fill_super
- * @sb: The ecryptfs super block
- * @raw_data: The options passed to mount
- * @silent: Not used but required by function prototype
- *
- * Sets up what we can of the sb, rest is done in ecryptfs_read_super
- *
- * Returns zero on success; non-zero otherwise
+ * ecryptfs_get_sb
+ * @fs_type
+ * @flags
+ * @dev_name: The path to mount over
+ * @raw_data: The options passed into the kernel
  */
-static int
-ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
+static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags,
+			const char *dev_name, void *raw_data)
 {
-	int rc = 0;
+	struct super_block *s;
+	struct ecryptfs_sb_info *sbi;
+	struct ecryptfs_dentry_info *root_info;
+	const char *err = "Getting sb failed";
+	struct inode *inode;
+	struct path path;
+	uid_t check_ruid;
+	int rc;
 
-	/* Released in ecryptfs_put_super() */
-	ecryptfs_set_superblock_private(sb,
-					kmem_cache_zalloc(ecryptfs_sb_info_cache,
-							 GFP_KERNEL));
-	if (!ecryptfs_superblock_to_private(sb)) {
-		ecryptfs_printk(KERN_WARNING, "Out of memory\n");
+	sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
+	if (!sbi) {
 		rc = -ENOMEM;
 		goto out;
 	}
-	sb->s_op = &ecryptfs_sops;
-	/* Released through deactivate_super(sb) from get_sb_nodev */
-	sb->s_root = d_alloc(NULL, &(const struct qstr) {
-			     .hash = 0,.name = "/",.len = 1});
-	if (!sb->s_root) {
-		ecryptfs_printk(KERN_ERR, "d_alloc failed\n");
-		rc = -ENOMEM;
+
+	rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid);
+	if (rc) {
+		err = "Error parsing options";
 		goto out;
 	}
-	sb->s_root->d_op = &ecryptfs_dops;
-	sb->s_root->d_sb = sb;
-	sb->s_root->d_parent = sb->s_root;
-	/* Released in d_release when dput(sb->s_root) is called */
-	/* through deactivate_super(sb) from get_sb_nodev() */
-	ecryptfs_set_dentry_private(sb->s_root,
-				    kmem_cache_zalloc(ecryptfs_dentry_info_cache,
-						     GFP_KERNEL));
-	if (!ecryptfs_dentry_to_private(sb->s_root)) {
-		ecryptfs_printk(KERN_ERR,
-				"dentry_info_cache alloc failed\n");
-		rc = -ENOMEM;
+
+	s = sget(fs_type, NULL, set_anon_super, flags, NULL);
+	if (IS_ERR(s)) {
+		rc = PTR_ERR(s);
 		goto out;
 	}
-	rc = 0;
-out:
-	/* Should be able to rely on deactivate_super called from
-	 * get_sb_nodev */
-	return rc;
-}
 
-/**
- * ecryptfs_read_super
- * @sb: The ecryptfs super block
- * @dev_name: The path to mount over
- *
- * Read the super block of the lower filesystem, and use
- * ecryptfs_interpose to create our initial inode and super block
- * struct.
- */
-static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
-{
-	int rc;
-	struct nameidata nd;
-	struct dentry *lower_root;
-	struct vfsmount *lower_mnt;
+	rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
+	if (rc)
+		goto out1;
 
-	memset(&nd, 0, sizeof(struct nameidata));
-	rc = path_lookup(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
+	ecryptfs_set_superblock_private(s, sbi);
+	s->s_bdi = &sbi->bdi;
+
+	/* ->kill_sb() will take care of sbi after that point */
+	sbi = NULL;
+	s->s_op = &ecryptfs_sops;
+	s->s_d_op = &ecryptfs_dops;
+
+	err = "Reading sb failed";
+	rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
 	if (rc) {
-		ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n");
-		goto out;
+		ecryptfs_printk(KERN_WARNING, "kern_path() failed\n");
+		goto out1;
 	}
-	lower_root = nd.path.dentry;
-	lower_mnt = nd.path.mnt;
-	ecryptfs_set_superblock_lower(sb, lower_root->d_sb);
-	sb->s_maxbytes = lower_root->d_sb->s_maxbytes;
-	sb->s_blocksize = lower_root->d_sb->s_blocksize;
-	ecryptfs_set_dentry_lower(sb->s_root, lower_root);
-	ecryptfs_set_dentry_lower_mnt(sb->s_root, lower_mnt);
-	rc = ecryptfs_interpose(lower_root, sb->s_root, sb, 0);
-	if (rc)
+	if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
+		rc = -EINVAL;
+		printk(KERN_ERR "Mount on filesystem of type "
+			"eCryptfs explicitly disallowed due to "
+			"known incompatibilities\n");
 		goto out_free;
-	rc = 0;
-	goto out;
-out_free:
-	path_put(&nd.path);
-out:
-	return rc;
-}
-
-/**
- * ecryptfs_get_sb
- * @fs_type
- * @flags
- * @dev_name: The path to mount over
- * @raw_data: The options passed into the kernel
- *
- * The whole ecryptfs_get_sb process is broken into 4 functions:
- * ecryptfs_parse_options(): handle options passed to ecryptfs, if any
- * ecryptfs_fill_super(): used by get_sb_nodev, fills out the super_block
- *                        with as much information as it can before needing
- *                        the lower filesystem.
- * ecryptfs_read_super(): this accesses the lower filesystem and uses
- *                        ecryptfs_interpolate to perform most of the linking
- * ecryptfs_interpolate(): links the lower filesystem into ecryptfs
- */
-static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
-			const char *dev_name, void *raw_data,
-			struct vfsmount *mnt)
-{
-	int rc;
-	struct super_block *sb;
-
-	rc = get_sb_nodev(fs_type, flags, raw_data, ecryptfs_fill_super, mnt);
-	if (rc < 0) {
-		printk(KERN_ERR "Getting sb failed; rc = [%d]\n", rc);
-		goto out;
 	}
-	sb = mnt->mnt_sb;
-	rc = ecryptfs_parse_options(sb, raw_data);
-	if (rc) {
-		printk(KERN_ERR "Error parsing options; rc = [%d]\n", rc);
-		goto out_abort;
+
+	if (check_ruid && !uid_eq(path.dentry->d_inode->i_uid, current_uid())) {
+		rc = -EPERM;
+		printk(KERN_ERR "Mount of device (uid: %d) not owned by "
+		       "requested user (uid: %d)\n",
+			i_uid_read(path.dentry->d_inode),
+			from_kuid(&init_user_ns, current_uid()));
+		goto out_free;
 	}
-	rc = ecryptfs_read_super(sb, dev_name);
-	if (rc) {
-		printk(KERN_ERR "Reading sb failed; rc = [%d]\n", rc);
-		goto out_abort;
+
+	ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
+
+	/**
+	 * Set the POSIX ACL flag based on whether they're enabled in the lower
+	 * mount. Force a read-only eCryptfs mount if the lower mount is ro.
+	 * Allow a ro eCryptfs mount even when the lower mount is rw.
+	 */
+	s->s_flags = flags & ~MS_POSIXACL;
+	s->s_flags |= path.dentry->d_sb->s_flags & (MS_RDONLY | MS_POSIXACL);
+
+	s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
+	s->s_blocksize = path.dentry->d_sb->s_blocksize;
+	s->s_magic = ECRYPTFS_SUPER_MAGIC;
+
+	inode = ecryptfs_get_inode(path.dentry->d_inode, s);
+	rc = PTR_ERR(inode);
+	if (IS_ERR(inode))
+		goto out_free;
+
+	s->s_root = d_make_root(inode);
+	if (!s->s_root) {
+		rc = -ENOMEM;
+		goto out_free;
 	}
-	goto out;
-out_abort:
-	dput(sb->s_root);
-	up_write(&sb->s_umount);
-	deactivate_super(sb);
+
+	rc = -ENOMEM;
+	root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
+	if (!root_info)
+		goto out_free;
+
+	/* ->kill_sb() will take care of root_info */
+	ecryptfs_set_dentry_private(s->s_root, root_info);
+	root_info->lower_path = path;
+
+	s->s_flags |= MS_ACTIVE;
+	return dget(s->s_root);
+
+out_free:
+	path_put(&path);
+out1:
+	deactivate_locked_super(s);
 out:
-	return rc;
+	if (sbi) {
+		ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat);
+		kmem_cache_free(ecryptfs_sb_info_cache, sbi);
+	}
+	printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
+	return ERR_PTR(rc);
 }
 
 /**
@@ -584,20 +608,26 @@ out:
  * @sb: The ecryptfs super block
  *
  * Used to bring the superblock down and free the private data.
- * Private data is free'd in ecryptfs_put_super()
  */
 static void ecryptfs_kill_block_super(struct super_block *sb)
 {
-	generic_shutdown_super(sb);
+	struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
+	kill_anon_super(sb);
+	if (!sb_info)
+		return;
+	ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
+	bdi_destroy(&sb_info->bdi);
+	kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
 }
 
 static struct file_system_type ecryptfs_fs_type = {
 	.owner = THIS_MODULE,
 	.name = "ecryptfs",
-	.get_sb = ecryptfs_get_sb,
+	.mount = ecryptfs_mount,
 	.kill_sb = ecryptfs_kill_block_super,
 	.fs_flags = 0
 };
+MODULE_ALIAS_FS("ecryptfs");
 
 /**
  * inode_info_init_once
@@ -605,7 +635,7 @@ static struct file_system_type ecryptfs_fs_type = {
  * Initializes the ecryptfs_inode_info_cache when it is created
  */
 static void
-inode_info_init_once(struct kmem_cache *cachep, void *vptr)
+inode_info_init_once(void *vptr)
 {
 	struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
 
@@ -616,7 +646,7 @@ static struct ecryptfs_cache_info {
 	struct kmem_cache **cache;
 	const char *name;
 	size_t size;
-	void (*ctor)(struct kmem_cache *cache, void *obj);
+	void (*ctor)(void *obj);
 } ecryptfs_cache_infos[] = {
 	{
 		.cache = &ecryptfs_auth_tok_list_item_cache,
@@ -645,13 +675,8 @@ 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,
 	},
 	{
@@ -685,6 +710,12 @@ static void ecryptfs_free_kmem_caches(void)
 {
 	int i;
 
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+
 	for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
 		struct ecryptfs_cache_info *info;
 
@@ -774,9 +805,10 @@ static int __init ecryptfs_init(void)
 		ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
 				"larger than the host's page size, and so "
 				"eCryptfs cannot run on this system. The "
-				"default eCryptfs extent size is [%d] bytes; "
-				"the page size is [%d] bytes.\n",
-				ECRYPTFS_DEFAULT_EXTENT_SIZE, PAGE_CACHE_SIZE);
+				"default eCryptfs extent size is [%u] bytes; "
+				"the page size is [%lu] bytes.\n",
+				ECRYPTFS_DEFAULT_EXTENT_SIZE,
+				(unsigned long)PAGE_CACHE_SIZE);
 		goto out;
 	}
 	rc = ecryptfs_init_kmem_caches();
@@ -785,39 +817,48 @@ static int __init ecryptfs_init(void)
 		       "Failed to allocate one or more kmem_cache objects\n");
 		goto out;
 	}
-	rc = register_filesystem(&ecryptfs_fs_type);
-	if (rc) {
-		printk(KERN_ERR "Failed to register filesystem\n");
-		goto out_free_kmem_caches;
-	}
 	rc = do_sysfs_registration();
 	if (rc) {
 		printk(KERN_ERR "sysfs registration failed\n");
-		goto out_unregister_filesystem;
+		goto out_free_kmem_caches;
 	}
-	rc = ecryptfs_init_messaging(ecryptfs_transport);
+	rc = ecryptfs_init_kthread();
 	if (rc) {
-		ecryptfs_printk(KERN_ERR, "Failure occured while attempting to "
-				"initialize the eCryptfs netlink socket\n");
+		printk(KERN_ERR "%s: kthread initialization failed; "
+		       "rc = [%d]\n", __func__, rc);
 		goto out_do_sysfs_unregistration;
 	}
+	rc = ecryptfs_init_messaging();
+	if (rc) {
+		printk(KERN_ERR "Failure occurred while attempting to "
+				"initialize the communications channel to "
+				"ecryptfsd\n");
+		goto out_destroy_kthread;
+	}
 	rc = ecryptfs_init_crypto();
 	if (rc) {
 		printk(KERN_ERR "Failure whilst attempting to init crypto; "
 		       "rc = [%d]\n", rc);
 		goto out_release_messaging;
 	}
+	rc = register_filesystem(&ecryptfs_fs_type);
+	if (rc) {
+		printk(KERN_ERR "Failed to register filesystem\n");
+		goto out_destroy_crypto;
+	}
 	if (ecryptfs_verbosity > 0)
 		printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
 			"will be written to the syslog!\n", ecryptfs_verbosity);
 
 	goto out;
+out_destroy_crypto:
+	ecryptfs_destroy_crypto();
 out_release_messaging:
-	ecryptfs_release_messaging(ecryptfs_transport);
+	ecryptfs_release_messaging();
+out_destroy_kthread:
+	ecryptfs_destroy_kthread();
 out_do_sysfs_unregistration:
 	do_sysfs_unregistration();
-out_unregister_filesystem:
-	unregister_filesystem(&ecryptfs_fs_type);
 out_free_kmem_caches:
 	ecryptfs_free_kmem_caches();
 out:
@@ -832,7 +873,8 @@ static void __exit ecryptfs_exit(void)
 	if (rc)
 		printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
 		       "rc = [%d]\n", rc);
-	ecryptfs_release_messaging(ecryptfs_transport);
+	ecryptfs_release_messaging();
+	ecryptfs_destroy_kthread();
 	do_sysfs_unregistration();
 	unregister_filesystem(&ecryptfs_fs_type);
 	ecryptfs_free_kmem_caches();