1 files changed, 161 insertions, 543 deletions

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index fd3f94d4a66..16a7a555f39 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -37,130 +37,27 @@
 struct kmem_cache *ecryptfs_lower_page_cache;
 
 /**
- * ecryptfs_get1page
+ * ecryptfs_get_locked_page
  *
  * Get one page from cache or lower f/s, return error otherwise.
  *
- * Returns unlocked and up-to-date page (if ok), with increased
+ * Returns locked and up-to-date page (if ok), with increased
  * refcnt.
  */
-static struct page *ecryptfs_get1page(struct file *file, int index)
+struct page *ecryptfs_get_locked_page(struct file *file, loff_t index)
 {
 	struct dentry *dentry;
 	struct inode *inode;
 	struct address_space *mapping;
+	struct page *page;
 
 	dentry = file->f_path.dentry;
 	inode = dentry->d_inode;
 	mapping = inode->i_mapping;
-	return read_mapping_page(mapping, index, (void *)file);
-}
-
-/**
- * ecryptfs_fill_zeros
- * @file: The ecryptfs file
- * @new_length: The new length of the data in the underlying file;
- *              everything between the prior end of the file and the
- *              new end of the file will be filled with zero's.
- *              new_length must be greater than  current length
- *
- * Function for handling lseek-ing past the end of the file.
- *
- * This function does not support shrinking, only growing a file.
- *
- * Returns zero on success; non-zero otherwise.
- */
-int ecryptfs_fill_zeros(struct file *file, loff_t new_length)
-{
-	int rc = 0;
-	struct dentry *dentry = file->f_path.dentry;
-	struct inode *inode = dentry->d_inode;
-	pgoff_t old_end_page_index = 0;
-	pgoff_t index = old_end_page_index;
-	int old_end_pos_in_page = -1;
-	pgoff_t new_end_page_index;
-	int new_end_pos_in_page;
-	loff_t cur_length = i_size_read(inode);
-
-	if (cur_length != 0) {
-		index = old_end_page_index =
-		    ((cur_length - 1) >> PAGE_CACHE_SHIFT);
-		old_end_pos_in_page = ((cur_length - 1) & ~PAGE_CACHE_MASK);
-	}
-	new_end_page_index = ((new_length - 1) >> PAGE_CACHE_SHIFT);
-	new_end_pos_in_page = ((new_length - 1) & ~PAGE_CACHE_MASK);
-	ecryptfs_printk(KERN_DEBUG, "old_end_page_index = [0x%.16x]; "
-			"old_end_pos_in_page = [%d]; "
-			"new_end_page_index = [0x%.16x]; "
-			"new_end_pos_in_page = [%d]\n",
-			old_end_page_index, old_end_pos_in_page,
-			new_end_page_index, new_end_pos_in_page);
-	if (old_end_page_index == new_end_page_index) {
-		/* Start and end are in the same page; we just need to
-		 * set a portion of the existing page to zero's */
-		rc = ecryptfs_write_zeros(file, index,
-					  (old_end_pos_in_page + 1),
-					  (new_end_pos_in_page
-					   - old_end_pos_in_page));
-		if (rc)
-			ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros("
-					"file=[%p], "
-					"index=[0x%.16x], "
-					"old_end_pos_in_page=[d], "
-					"(PAGE_CACHE_SIZE - new_end_pos_in_page"
-					"=[%d]"
-					")=[d]) returned [%d]\n", file, index,
-					old_end_pos_in_page,
-					new_end_pos_in_page,
-					(PAGE_CACHE_SIZE - new_end_pos_in_page),
-					rc);
-		goto out;
-	}
-	/* Fill the remainder of the previous last page with zeros */
-	rc = ecryptfs_write_zeros(file, index, (old_end_pos_in_page + 1),
-			 ((PAGE_CACHE_SIZE - 1) - old_end_pos_in_page));
-	if (rc) {
-		ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros(file=[%p], "
-				"index=[0x%.16x], old_end_pos_in_page=[d], "
-				"(PAGE_CACHE_SIZE - old_end_pos_in_page)=[d]) "
-				"returned [%d]\n", file, index,
-				old_end_pos_in_page,
-				(PAGE_CACHE_SIZE - old_end_pos_in_page), rc);
-		goto out;
-	}
-	index++;
-	while (index < new_end_page_index) {
-		/* Fill all intermediate pages with zeros */
-		rc = ecryptfs_write_zeros(file, index, 0, PAGE_CACHE_SIZE);
-		if (rc) {
-			ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros("
-					"file=[%p], "
-					"index=[0x%.16x], "
-					"old_end_pos_in_page=[d], "
-					"(PAGE_CACHE_SIZE - new_end_pos_in_page"
-					"=[%d]"
-					")=[d]) returned [%d]\n", file, index,
-					old_end_pos_in_page,
-					new_end_pos_in_page,
-					(PAGE_CACHE_SIZE - new_end_pos_in_page),
-					rc);
-			goto out;
-		}
-		index++;
-	}
-	/* Fill the portion at the beginning of the last new page with
-	 * zero's */
-	rc = ecryptfs_write_zeros(file, index, 0, (new_end_pos_in_page + 1));
-	if (rc) {
-		ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros(file="
-				"[%p], index=[0x%.16x], 0, "
-				"new_end_pos_in_page=[%d]"
-				"returned [%d]\n", file, index,
-				new_end_pos_in_page, rc);
-		goto out;
-	}
-out:
-	return rc;
+	page = read_mapping_page(mapping, index, (void *)file);
+	if (!IS_ERR(page))
+		lock_page(page);
+	return page;
 }
 
 /**
@@ -171,13 +68,9 @@ out:
  */
 static int ecryptfs_writepage(struct page *page, struct writeback_control *wbc)
 {
-	struct ecryptfs_page_crypt_context ctx;
 	int rc;
 
-	ctx.page = page;
-	ctx.mode = ECRYPTFS_WRITEPAGE_MODE;
-	ctx.param.wbc = wbc;
-	rc = ecryptfs_encrypt_page(&ctx);
+	rc = ecryptfs_encrypt_page(page);
 	if (rc) {
 		ecryptfs_printk(KERN_WARNING, "Error encrypting "
 				"page (upper index [0x%.16x])\n", page->index);
@@ -191,58 +84,6 @@ out:
 }
 
 /**
- * Reads the data from the lower file file at index lower_page_index
- * and copies that data into page.
- *
- * @param page	Page to fill
- * @param lower_page_index Index of the page in the lower file to get
- */
-int ecryptfs_do_readpage(struct file *file, struct page *page,
-			 pgoff_t lower_page_index)
-{
-	int rc;
-	struct dentry *dentry;
-	struct file *lower_file;
-	struct dentry *lower_dentry;
-	struct inode *inode;
-	struct inode *lower_inode;
-	char *page_data;
-	struct page *lower_page = NULL;
-	char *lower_page_data;
-	const struct address_space_operations *lower_a_ops;
-
-	dentry = file->f_path.dentry;
-	lower_file = ecryptfs_file_to_lower(file);
-	lower_dentry = ecryptfs_dentry_to_lower(dentry);
-	inode = dentry->d_inode;
-	lower_inode = ecryptfs_inode_to_lower(inode);
-	lower_a_ops = lower_inode->i_mapping->a_ops;
-	lower_page = read_cache_page(lower_inode->i_mapping, lower_page_index,
-				     (filler_t *)lower_a_ops->readpage,
-				     (void *)lower_file);
-	if (IS_ERR(lower_page)) {
-		rc = PTR_ERR(lower_page);
-		lower_page = NULL;
-		ecryptfs_printk(KERN_ERR, "Error reading from page cache\n");
-		goto out;
-	}
-	page_data = kmap_atomic(page, KM_USER0);
-	lower_page_data = kmap_atomic(lower_page, KM_USER1);
-	memcpy(page_data, lower_page_data, PAGE_CACHE_SIZE);
-	kunmap_atomic(lower_page_data, KM_USER1);
-	kunmap_atomic(page_data, KM_USER0);
-	flush_dcache_page(page);
-	rc = 0;
-out:
-	if (likely(lower_page))
-		page_cache_release(lower_page);
-	if (rc == 0)
-		SetPageUptodate(page);
-	else
-		ClearPageUptodate(page);
-	return rc;
-}
-/**
  *   Header Extent:
  *     Octets 0-7:        Unencrypted file size (big-endian)
  *     Octets 8-15:       eCryptfs special marker
@@ -271,9 +112,77 @@ static void set_header_info(char *page_virt,
 }
 
 /**
+ * ecryptfs_copy_up_encrypted_with_header
+ * @page: Sort of a ``virtual'' representation of the encrypted lower
+ *        file. The actual lower file does not have the metadata in
+ *        the header. This is locked.
+ * @crypt_stat: The eCryptfs inode's cryptographic context
+ *
+ * The ``view'' is the version of the file that userspace winds up
+ * seeing, with the header information inserted.
+ */
+static int
+ecryptfs_copy_up_encrypted_with_header(struct page *page,
+				       struct ecryptfs_crypt_stat *crypt_stat)
+{
+	loff_t extent_num_in_page = 0;
+	loff_t num_extents_per_page = (PAGE_CACHE_SIZE
+				       / crypt_stat->extent_size);
+	int rc = 0;
+
+	while (extent_num_in_page < num_extents_per_page) {
+		loff_t view_extent_num = ((((loff_t)page->index)
+					   * num_extents_per_page)
+					  + extent_num_in_page);
+
+		if (view_extent_num < crypt_stat->num_header_extents_at_front) {
+			/* This is a header extent */
+			char *page_virt;
+
+			page_virt = kmap_atomic(page, KM_USER0);
+			memset(page_virt, 0, PAGE_CACHE_SIZE);
+			/* TODO: Support more than one header extent */
+			if (view_extent_num == 0) {
+				rc = ecryptfs_read_xattr_region(
+					page_virt, page->mapping->host);
+				set_header_info(page_virt, crypt_stat);
+			}
+			kunmap_atomic(page_virt, KM_USER0);
+			flush_dcache_page(page);
+			if (rc) {
+				printk(KERN_ERR "%s: Error reading xattr "
+				       "region; rc = [%d]\n", __FUNCTION__, rc);
+				goto out;
+			}
+		} else {
+			/* This is an encrypted data extent */
+			loff_t lower_offset =
+				((view_extent_num -
+				  crypt_stat->num_header_extents_at_front)
+				 * crypt_stat->extent_size);
+
+			rc = ecryptfs_read_lower_page_segment(
+				page, (lower_offset >> PAGE_CACHE_SHIFT),
+				(lower_offset & ~PAGE_CACHE_MASK),
+				crypt_stat->extent_size, page->mapping->host);
+			if (rc) {
+				printk(KERN_ERR "%s: Error attempting to read "
+				       "extent at offset [%lld] in the lower "
+				       "file; rc = [%d]\n", __FUNCTION__,
+				       lower_offset, rc);
+				goto out;
+			}
+		}
+		extent_num_in_page++;
+	}
+out:
+	return rc;
+}
+
+/**
  * ecryptfs_readpage
- * @file: This is an ecryptfs file
- * @page: ecryptfs associated page to stick the read data into
+ * @file: An eCryptfs file
+ * @page: Page from eCryptfs inode mapping into which to stick the read data
  *
  * Read in a page, decrypting if necessary.
  *
@@ -281,59 +190,35 @@ static void set_header_info(char *page_virt,
  */
 static int ecryptfs_readpage(struct file *file, struct page *page)
 {
+	struct ecryptfs_crypt_stat *crypt_stat =
+		&ecryptfs_inode_to_private(file->f_path.dentry->d_inode)->crypt_stat;
 	int rc = 0;
-	struct ecryptfs_crypt_stat *crypt_stat;
 
-	BUG_ON(!(file && file->f_path.dentry && file->f_path.dentry->d_inode));
-	crypt_stat = &ecryptfs_inode_to_private(file->f_path.dentry->d_inode)
-			->crypt_stat;
 	if (!crypt_stat
 	    || !(crypt_stat->flags & ECRYPTFS_ENCRYPTED)
 	    || (crypt_stat->flags & ECRYPTFS_NEW_FILE)) {
 		ecryptfs_printk(KERN_DEBUG,
 				"Passing through unencrypted page\n");
-		rc = ecryptfs_do_readpage(file, page, page->index);
-		if (rc) {
-			ecryptfs_printk(KERN_ERR, "Error reading page; rc = "
-					"[%d]\n", rc);
-			goto out;
-		}
+		rc = ecryptfs_read_lower_page_segment(page, page->index, 0,
+						      PAGE_CACHE_SIZE,
+						      page->mapping->host);
 	} else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) {
 		if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
-			int num_pages_in_header_region =
-				(crypt_stat->header_extent_size
-				 / PAGE_CACHE_SIZE);
-
-			if (page->index < num_pages_in_header_region) {
-				char *page_virt;
-
-				page_virt = kmap_atomic(page, KM_USER0);
-				memset(page_virt, 0, PAGE_CACHE_SIZE);
-				if (page->index == 0) {
-					rc = ecryptfs_read_xattr_region(
-						page_virt, file->f_path.dentry);
-					set_header_info(page_virt, crypt_stat);
-				}
-				kunmap_atomic(page_virt, KM_USER0);
-				flush_dcache_page(page);
-				if (rc) {
-					printk(KERN_ERR "Error reading xattr "
-					       "region\n");
-					goto out;
-				}
-			} else {
-				rc = ecryptfs_do_readpage(
-					file, page,
-					(page->index
-					 - num_pages_in_header_region));
-				if (rc) {
-					printk(KERN_ERR "Error reading page; "
-					       "rc = [%d]\n", rc);
-					goto out;
-				}
+			rc = ecryptfs_copy_up_encrypted_with_header(page,
+								    crypt_stat);
+			if (rc) {
+				printk(KERN_ERR "%s: Error attempting to copy "
+				       "the encrypted content from the lower "
+				       "file whilst inserting the metadata "
+				       "from the xattr into the header; rc = "
+				       "[%d]\n", __FUNCTION__, rc);
+				goto out;
 			}
+
 		} else {
-			rc = ecryptfs_do_readpage(file, page, page->index);
+			rc = ecryptfs_read_lower_page_segment(
+				page, page->index, 0, PAGE_CACHE_SIZE,
+				page->mapping->host);
 			if (rc) {
 				printk(KERN_ERR "Error reading page; rc = "
 				       "[%d]\n", rc);
@@ -341,17 +226,18 @@ static int ecryptfs_readpage(struct file *file, struct page *page)
 			}
 		}
 	} else {
-		rc = ecryptfs_decrypt_page(file, page);
+		rc = ecryptfs_decrypt_page(page);
 		if (rc) {
 			ecryptfs_printk(KERN_ERR, "Error decrypting page; "
 					"rc = [%d]\n", rc);
 			goto out;
 		}
 	}
-	SetPageUptodate(page);
 out:
 	if (rc)
 		ClearPageUptodate(page);
+	else
+		SetPageUptodate(page);
 	ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16x]\n",
 			page->index);
 	unlock_page(page);
@@ -377,27 +263,6 @@ out:
 	return 0;
 }
 
-/**
- * eCryptfs does not currently support holes. When writing after a
- * seek past the end of the file, eCryptfs fills in 0's through to the
- * current location. The code to fill in the 0's to all the
- * intermediate pages calls ecryptfs_prepare_write_no_truncate().
- */
-static int
-ecryptfs_prepare_write_no_truncate(struct file *file, struct page *page,
-				   unsigned from, unsigned to)
-{
-	int rc = 0;
-
-	if (from == 0 && to == PAGE_CACHE_SIZE)
-		goto out;	/* If we are writing a full page, it will be
-				   up to date. */
-	if (!PageUptodate(page))
-		rc = ecryptfs_do_readpage(file, page, page->index);
-out:
-	return rc;
-}
-
 static int ecryptfs_prepare_write(struct file *file, struct page *page,
 				  unsigned from, unsigned to)
 {
@@ -406,10 +271,21 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
 	if (from == 0 && to == PAGE_CACHE_SIZE)
 		goto out;	/* If we are writing a full page, it will be
 				   up to date. */
-	if (!PageUptodate(page))
-		rc = ecryptfs_do_readpage(file, page, page->index);
+	if (!PageUptodate(page)) {
+		rc = ecryptfs_read_lower_page_segment(page, page->index, 0,
+						      PAGE_CACHE_SIZE,
+						      page->mapping->host);
+		if (rc) {
+			printk(KERN_ERR "%s: Error attemping to read lower "
+			       "page segment; rc = [%d]\n", __FUNCTION__, rc);
+			ClearPageUptodate(page);
+			goto out;
+		} else
+			SetPageUptodate(page);
+	}
 	if (page->index != 0) {
-		loff_t end_of_prev_pg_pos = page_offset(page) - 1;
+		loff_t end_of_prev_pg_pos =
+			(((loff_t)page->index << PAGE_CACHE_SHIFT) - 1);
 
 		if (end_of_prev_pg_pos > i_size_read(page->mapping->host)) {
 			rc = ecryptfs_truncate(file->f_path.dentry,
@@ -428,32 +304,6 @@ out:
 	return rc;
 }
 
-int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
-					      struct inode *lower_inode,
-					      struct writeback_control *wbc)
-{
-	int rc = 0;
-
-	rc = lower_inode->i_mapping->a_ops->writepage(lower_page, wbc);
-	if (rc) {
-		ecryptfs_printk(KERN_ERR, "Error calling lower writepage(); "
-				"rc = [%d]\n", rc);
-		goto out;
-	}
-	lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
-	page_cache_release(lower_page);
-out:
-	return rc;
-}
-
-static
-void ecryptfs_release_lower_page(struct page *lower_page, int page_locked)
-{
-	if (page_locked)
-		unlock_page(lower_page);
-	page_cache_release(lower_page);
-}
-
 /**
  * ecryptfs_write_inode_size_to_header
  *
@@ -461,67 +311,48 @@ void ecryptfs_release_lower_page(struct page *lower_page, int page_locked)
  *
  * Returns zero on success; non-zero on error.
  */
-static int ecryptfs_write_inode_size_to_header(struct file *lower_file,
-					       struct inode *lower_inode,
-					       struct inode *inode)
+static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode)
 {
-	int rc = 0;
-	struct page *header_page;
-	char *header_virt;
-	const struct address_space_operations *lower_a_ops;
 	u64 file_size;
+	char *file_size_virt;
+	int rc;
 
-retry:
-	header_page = grab_cache_page(lower_inode->i_mapping, 0);
-	if (!header_page) {
-		ecryptfs_printk(KERN_ERR, "grab_cache_page for "
-				"lower_page_index 0 failed\n");
-		rc = -EINVAL;
-		goto out;
-	}
-	lower_a_ops = lower_inode->i_mapping->a_ops;
-	rc = lower_a_ops->prepare_write(lower_file, header_page, 0, 8);
-	if (rc) {
-		if (rc == AOP_TRUNCATED_PAGE) {
-			ecryptfs_release_lower_page(header_page, 0);
-			goto retry;
-		} else
-			ecryptfs_release_lower_page(header_page, 1);
+	file_size_virt = kmalloc(sizeof(u64), GFP_KERNEL);
+	if (!file_size_virt) {
+		rc = -ENOMEM;
 		goto out;
 	}
-	file_size = (u64)i_size_read(inode);
-	ecryptfs_printk(KERN_DEBUG, "Writing size: [0x%.16x]\n", file_size);
+	file_size = (u64)i_size_read(ecryptfs_inode);
 	file_size = cpu_to_be64(file_size);
-	header_virt = kmap_atomic(header_page, KM_USER0);
-	memcpy(header_virt, &file_size, sizeof(u64));
-	kunmap_atomic(header_virt, KM_USER0);
-	flush_dcache_page(header_page);
-	rc = lower_a_ops->commit_write(lower_file, header_page, 0, 8);
-	if (rc < 0)
-		ecryptfs_printk(KERN_ERR, "Error commiting header page "
-				"write\n");
-	if (rc == AOP_TRUNCATED_PAGE) {
-		ecryptfs_release_lower_page(header_page, 0);
-		goto retry;
-	} else
-		ecryptfs_release_lower_page(header_page, 1);
-	lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
-	mark_inode_dirty_sync(inode);
+	memcpy(file_size_virt, &file_size, sizeof(u64));
+	rc = ecryptfs_write_lower(ecryptfs_inode, file_size_virt, 0,
+				  sizeof(u64));
+	kfree(file_size_virt);
+	if (rc)
+		printk(KERN_ERR "%s: Error writing file size to header; "
+		       "rc = [%d]\n", __FUNCTION__, rc);
 out:
 	return rc;
 }
 
-static int ecryptfs_write_inode_size_to_xattr(struct inode *lower_inode,
-					      struct inode *inode,
-					      struct dentry *ecryptfs_dentry,
-					      int lower_i_mutex_held)
+struct kmem_cache *ecryptfs_xattr_cache;
+
+static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
 {
 	ssize_t size;
 	void *xattr_virt;
-	struct dentry *lower_dentry;
+	struct dentry *lower_dentry =
+		ecryptfs_inode_to_private(ecryptfs_inode)->lower_file->f_dentry;
+	struct inode *lower_inode = lower_dentry->d_inode;
 	u64 file_size;
 	int rc;
 
+	if (!lower_inode->i_op->getxattr || !lower_inode->i_op->setxattr) {
+		printk(KERN_WARNING
+		       "No support for setting xattr in lower filesystem\n");
+		rc = -ENOSYS;
+		goto out;
+	}
 	xattr_virt = kmem_cache_alloc(ecryptfs_xattr_cache, GFP_KERNEL);
 	if (!xattr_virt) {
 		printk(KERN_ERR "Out of memory whilst attempting to write "
@@ -529,35 +360,17 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *lower_inode,
 		rc = -ENOMEM;
 		goto out;
 	}
-	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
-	if (!lower_dentry->d_inode->i_op->getxattr ||
-			!lower_dentry->d_inode->i_op->setxattr) {
-		printk(KERN_WARNING
-		       "No support for setting xattr in lower filesystem\n");
-		rc = -ENOSYS;
-		kmem_cache_free(ecryptfs_xattr_cache, xattr_virt);
-		goto out;
-	}
-	if (!lower_i_mutex_held)
-		mutex_lock(&lower_dentry->d_inode->i_mutex);
-	size = lower_dentry->d_inode->i_op->getxattr(lower_dentry,
-						     ECRYPTFS_XATTR_NAME,
-						     xattr_virt,
-						     PAGE_CACHE_SIZE);
-	if (!lower_i_mutex_held)
-		mutex_unlock(&lower_dentry->d_inode->i_mutex);
+	mutex_lock(&lower_inode->i_mutex);
+	size = lower_inode->i_op->getxattr(lower_dentry, ECRYPTFS_XATTR_NAME,
+					   xattr_virt, PAGE_CACHE_SIZE);
 	if (size < 0)
 		size = 8;
-	file_size = (u64)i_size_read(inode);
+	file_size = (u64)i_size_read(ecryptfs_inode);
 	file_size = cpu_to_be64(file_size);
 	memcpy(xattr_virt, &file_size, sizeof(u64));
-	if (!lower_i_mutex_held)
-		mutex_lock(&lower_dentry->d_inode->i_mutex);
-	rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry,
-						   ECRYPTFS_XATTR_NAME,
-						   xattr_virt, size, 0);
-	if (!lower_i_mutex_held)
-		mutex_unlock(&lower_dentry->d_inode->i_mutex);
+	rc = lower_inode->i_op->setxattr(lower_dentry, ECRYPTFS_XATTR_NAME,
+					 xattr_virt, size, 0);
+	mutex_unlock(&lower_inode->i_mutex);
 	if (rc)
 		printk(KERN_ERR "Error whilst attempting to write inode size "
 		       "to lower file xattr; rc = [%d]\n", rc);
@@ -566,122 +379,18 @@ out:
 	return rc;
 }
 
-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_write_inode_size_to_metadata(struct inode *ecryptfs_inode)
 {
 	struct ecryptfs_crypt_stat *crypt_stat;
 
-	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
+	crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
 	if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
-		return ecryptfs_write_inode_size_to_xattr(lower_inode, inode,
-							  ecryptfs_dentry,
-							  lower_i_mutex_held);
+		return ecryptfs_write_inode_size_to_xattr(ecryptfs_inode);
 	else
-		return ecryptfs_write_inode_size_to_header(lower_file,
-							   lower_inode,
-							   inode);
-}
-
-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,
-			    int region_bytes)
-{
-	int rc = 0;
-
-retry:
-	*lower_page = grab_cache_page(lower_inode->i_mapping, lower_page_index);
-	if (!(*lower_page)) {
-		rc = -EINVAL;
-		ecryptfs_printk(KERN_ERR, "Error attempting to grab "
-				"lower page with index [0x%.16x]\n",
-				lower_page_index);
-		goto out;
-	}
-	rc = lower_inode->i_mapping->a_ops->prepare_write(lower_file,
-							  (*lower_page),
-							  byte_offset,
-							  region_bytes);
-	if (rc) {
-		if (rc == AOP_TRUNCATED_PAGE) {
-			ecryptfs_release_lower_page(*lower_page, 0);
-			goto retry;
-		} else {
-			ecryptfs_printk(KERN_ERR, "prepare_write for "
-				"lower_page_index = [0x%.16x] failed; rc = "
-				"[%d]\n", lower_page_index, rc);
-			ecryptfs_release_lower_page(*lower_page, 1);
-			(*lower_page) = NULL;
-		}
-	}
-out:
-	return rc;
-}
-
-/**
- * ecryptfs_commit_lower_page
- *
- * Returns zero on success; non-zero on error
- */
-int
-ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
-			   struct file *lower_file, int byte_offset,
-			   int region_size)
-{
-	int page_locked = 1;
-	int rc = 0;
-
-	rc = lower_inode->i_mapping->a_ops->commit_write(
-		lower_file, lower_page, byte_offset, region_size);
-	if (rc == AOP_TRUNCATED_PAGE)
-		page_locked = 0;
-	if (rc < 0) {
-		ecryptfs_printk(KERN_ERR,
-				"Error committing write; rc = [%d]\n", rc);
-	} else
-		rc = 0;
-	ecryptfs_release_lower_page(lower_page, page_locked);
-	return rc;
+		return ecryptfs_write_inode_size_to_header(ecryptfs_inode);
 }
 
 /**
- * ecryptfs_copy_page_to_lower
- *
- * Used for plaintext pass-through; no page index interpolation
- * required.
- */
-int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
-				struct file *lower_file)
-{
-	int rc = 0;
-	struct page *lower_page;
-
-	rc = ecryptfs_get_lower_page(&lower_page, lower_inode, lower_file,
-				     page->index, 0, PAGE_CACHE_SIZE);
-	if (rc) {
-		ecryptfs_printk(KERN_ERR, "Error attempting to get page "
-				"at index [0x%.16x]\n", page->index);
-		goto out;
-	}
-	/* TODO: aops */
-	memcpy((char *)page_address(lower_page), page_address(page),
-	       PAGE_CACHE_SIZE);
-	rc = ecryptfs_commit_lower_page(lower_page, lower_inode, lower_file,
-					0, PAGE_CACHE_SIZE);
-	if (rc)
-		ecryptfs_printk(KERN_ERR, "Error attempting to commit page "
-				"at index [0x%.16x]\n", page->index);
-out:
-	return rc;
-}
-
-struct kmem_cache *ecryptfs_xattr_cache;
-
-/**
  * ecryptfs_commit_write
  * @file: The eCryptfs file object
  * @page: The eCryptfs page
@@ -695,20 +404,12 @@ struct kmem_cache *ecryptfs_xattr_cache;
 static int ecryptfs_commit_write(struct file *file, struct page *page,
 				 unsigned from, unsigned to)
 {
-	struct ecryptfs_page_crypt_context ctx;
 	loff_t pos;
-	struct inode *inode;
-	struct inode *lower_inode;
-	struct file *lower_file;
-	struct ecryptfs_crypt_stat *crypt_stat;
+	struct inode *ecryptfs_inode = page->mapping->host;
+	struct ecryptfs_crypt_stat *crypt_stat =
+		&ecryptfs_inode_to_private(file->f_path.dentry->d_inode)->crypt_stat;
 	int rc;
 
-	inode = page->mapping->host;
-	lower_inode = ecryptfs_inode_to_lower(inode);
-	lower_file = ecryptfs_file_to_lower(file);
-	mutex_lock(&lower_inode->i_mutex);
-	crypt_stat = &ecryptfs_inode_to_private(file->f_path.dentry->d_inode)
-				->crypt_stat;
 	if (crypt_stat->flags & ECRYPTFS_NEW_FILE) {
 		ecryptfs_printk(KERN_DEBUG, "ECRYPTFS_NEW_FILE flag set in "
 			"crypt_stat at memory location [%p]\n", crypt_stat);
@@ -718,6 +419,7 @@ static int ecryptfs_commit_write(struct file *file, struct page *page,
 	ecryptfs_printk(KERN_DEBUG, "Calling fill_zeros_to_end_of_page"
 			"(page w/ index = [0x%.16x], to = [%d])\n", page->index,
 			to);
+	/* Fills in zeros if 'to' goes beyond inode size */
 	rc = fill_zeros_to_end_of_page(page, to);
 	if (rc) {
 		ecryptfs_printk(KERN_WARNING, "Error attempting to fill "
@@ -725,82 +427,22 @@ static int ecryptfs_commit_write(struct file *file, struct page *page,
 				page->index);
 		goto out;
 	}
-	ctx.page = page;
-	ctx.mode = ECRYPTFS_PREPARE_COMMIT_MODE;
-	ctx.param.lower_file = lower_file;
-	rc = ecryptfs_encrypt_page(&ctx);
+	rc = ecryptfs_encrypt_page(page);
 	if (rc) {
 		ecryptfs_printk(KERN_WARNING, "Error encrypting page (upper "
 				"index [0x%.16x])\n", page->index);
 		goto out;
 	}
-	inode->i_blocks = lower_inode->i_blocks;
-	pos = page_offset(page) + to;
-	if (pos > i_size_read(inode)) {
-		i_size_write(inode, pos);
+	pos = (((loff_t)page->index) << PAGE_CACHE_SHIFT) + to;
+	if (pos > i_size_read(ecryptfs_inode)) {
+		i_size_write(ecryptfs_inode, pos);
 		ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
-				"[0x%.16x]\n", i_size_read(inode));
+				"[0x%.16x]\n", i_size_read(ecryptfs_inode));
 	}
-	rc = ecryptfs_write_inode_size_to_metadata(lower_file, lower_inode,
-						   inode, file->f_dentry,
-						   ECRYPTFS_LOWER_I_MUTEX_HELD);
+	rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
 	if (rc)
 		printk(KERN_ERR "Error writing inode size to metadata; "
 		       "rc = [%d]\n", rc);
-	lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
-	mark_inode_dirty_sync(inode);
-out:
-	if (rc < 0)
-		ClearPageUptodate(page);
-	else
-		SetPageUptodate(page);
-	mutex_unlock(&lower_inode->i_mutex);
-	return rc;
-}
-
-/**
- * ecryptfs_write_zeros
- * @file: The ecryptfs file
- * @index: The index in which we are writing
- * @start: The position after the last block of data
- * @num_zeros: The number of zeros to write
- *
- * Write a specified number of zero's to a page.
- *
- * (start + num_zeros) must be less than or equal to PAGE_CACHE_SIZE
- */
-int
-ecryptfs_write_zeros(struct file *file, pgoff_t index, int start, int num_zeros)
-{
-	int rc = 0;
-	struct page *tmp_page;
-
-	tmp_page = ecryptfs_get1page(file, index);
-	if (IS_ERR(tmp_page)) {
-		ecryptfs_printk(KERN_ERR, "Error getting page at index "
-				"[0x%.16x]\n", index);
-		rc = PTR_ERR(tmp_page);
-		goto out;
-	}
-	if ((rc = ecryptfs_prepare_write_no_truncate(file, tmp_page, start,
-						     (start + num_zeros)))) {
-		ecryptfs_printk(KERN_ERR, "Error preparing to write zero's "
-				"to page at index [0x%.16x]\n",
-				index);
-		page_cache_release(tmp_page);
-		goto out;
-	}
-	zero_user_page(tmp_page, start, num_zeros, KM_USER0);
-	rc = ecryptfs_commit_write(file, tmp_page, start, start + num_zeros);
-	if (rc < 0) {
-		ecryptfs_printk(KERN_ERR, "Error attempting to write zero's "
-				"to remainder of page at index [0x%.16x]\n",
-				index);
-		page_cache_release(tmp_page);
-		goto out;
-	}
-	rc = 0;
-	page_cache_release(tmp_page);
 out:
 	return rc;
 }
@@ -819,34 +461,10 @@ static sector_t ecryptfs_bmap(struct address_space *mapping, sector_t block)
 	return rc;
 }
 
-static void ecryptfs_sync_page(struct page *page)
-{
-	struct inode *inode;
-	struct inode *lower_inode;
-	struct page *lower_page;
-
-	inode = page->mapping->host;
-	lower_inode = ecryptfs_inode_to_lower(inode);
-	/* NOTE: Recently swapped with grab_cache_page(), since
-	 * sync_page() just makes sure that pending I/O gets done. */
-	lower_page = find_lock_page(lower_inode->i_mapping, page->index);
-	if (!lower_page) {
-		ecryptfs_printk(KERN_DEBUG, "find_lock_page failed\n");
-		return;
-	}
-	if (lower_page->mapping->a_ops->sync_page)
-		lower_page->mapping->a_ops->sync_page(lower_page);
-	ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16x]\n",
-			lower_page->index);
-	unlock_page(lower_page);
-	page_cache_release(lower_page);
-}
-
 struct address_space_operations ecryptfs_aops = {
 	.writepage = ecryptfs_writepage,
 	.readpage = ecryptfs_readpage,
 	.prepare_write = ecryptfs_prepare_write,
 	.commit_write = ecryptfs_commit_write,
 	.bmap = ecryptfs_bmap,
-	.sync_page = ecryptfs_sync_page,
 };