eCryptfs: remove unused functions and kmem_cache

The switch to read_write.c routines and the persistent file make a number of
functions unnecessary.  This patch removes them.
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ecryptfs/crypto.c

@@ -353,119 +353,6 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
 	return rc;
 }
 
-static void
-ecryptfs_extent_to_lwr_pg_idx_and_offset(unsigned long *lower_page_idx,
-					 int *byte_offset,
-					 struct ecryptfs_crypt_stat *crypt_stat,
-					 unsigned long extent_num)
-{
-	unsigned long lower_extent_num;
-	int extents_occupied_by_headers_at_front;
-	int bytes_occupied_by_headers_at_front;
-	int extent_offset;
-	int extents_per_page;
-
-	bytes_occupied_by_headers_at_front =
-		(crypt_stat->extent_size
-		 * crypt_stat->num_header_extents_at_front);
-	extents_occupied_by_headers_at_front =
-		( bytes_occupied_by_headers_at_front
-		  / crypt_stat->extent_size );
-	lower_extent_num = extents_occupied_by_headers_at_front + extent_num;
-	extents_per_page = PAGE_CACHE_SIZE / crypt_stat->extent_size;
-	(*lower_page_idx) = lower_extent_num / extents_per_page;
-	extent_offset = lower_extent_num % extents_per_page;
-	(*byte_offset) = extent_offset * crypt_stat->extent_size;
-	ecryptfs_printk(KERN_DEBUG, " * crypt_stat->extent_size = "
-			"[%d]\n", crypt_stat->extent_size);
-	ecryptfs_printk(KERN_DEBUG, " * crypt_stat->"
-			"num_header_extents_at_front = [%d]\n",
-			crypt_stat->num_header_extents_at_front);
-	ecryptfs_printk(KERN_DEBUG, " * extents_occupied_by_headers_at_"
-			"front = [%d]\n", extents_occupied_by_headers_at_front);
-	ecryptfs_printk(KERN_DEBUG, " * lower_extent_num = [0x%.16x]\n",
-			lower_extent_num);
-	ecryptfs_printk(KERN_DEBUG, " * extents_per_page = [%d]\n",
-			extents_per_page);
-	ecryptfs_printk(KERN_DEBUG, " * (*lower_page_idx) = [0x%.16x]\n",
-			(*lower_page_idx));
-	ecryptfs_printk(KERN_DEBUG, " * extent_offset = [%d]\n",
-			extent_offset);
-	ecryptfs_printk(KERN_DEBUG, " * (*byte_offset) = [%d]\n",
-			(*byte_offset));
-}
-
-static int ecryptfs_write_out_page(struct ecryptfs_page_crypt_context *ctx,
-				   struct page *lower_page,
-				   struct inode *lower_inode,
-				   int byte_offset_in_page, int bytes_to_write)
-{
-	int rc = 0;
-
-	if (ctx->mode == ECRYPTFS_PREPARE_COMMIT_MODE) {
-		rc = ecryptfs_commit_lower_page(lower_page, lower_inode,
-						ctx->param.lower_file,
-						byte_offset_in_page,
-						bytes_to_write);
-		if (rc) {
-			ecryptfs_printk(KERN_ERR, "Error calling lower "
-					"commit; rc = [%d]\n", rc);
-			goto out;
-		}
-	} else {
-		rc = ecryptfs_writepage_and_release_lower_page(lower_page,
-							       lower_inode,
-							       ctx->param.wbc);
-		if (rc) {
-			ecryptfs_printk(KERN_ERR, "Error calling lower "
-					"writepage(); rc = [%d]\n", rc);
-			goto out;
-		}
-	}
-out:
-	return rc;
-}
-
-static int ecryptfs_read_in_page(struct ecryptfs_page_crypt_context *ctx,
-				 struct page **lower_page,
-				 struct inode *lower_inode,
-				 unsigned long lower_page_idx,
-				 int byte_offset_in_page)
-{
-	int rc = 0;
-
-	if (ctx->mode == ECRYPTFS_PREPARE_COMMIT_MODE) {
-		/* TODO: Limit this to only the data extents that are
-		 * needed */
-		rc = ecryptfs_get_lower_page(lower_page, lower_inode,
-					     ctx->param.lower_file,
-					     lower_page_idx,
-					     byte_offset_in_page,
-					     (PAGE_CACHE_SIZE
-					      - byte_offset_in_page));
-		if (rc) {
-			ecryptfs_printk(
-				KERN_ERR, "Error attempting to grab, map, "
-				"and prepare_write lower page with index "
-				"[0x%.16x]; rc = [%d]\n", lower_page_idx, rc);
-			goto out;
-		}
-	} else {
-		*lower_page = grab_cache_page(lower_inode->i_mapping,
-					      lower_page_idx);
-		if (!(*lower_page)) {
-			rc = -EINVAL;
-			ecryptfs_printk(
-				KERN_ERR, "Error attempting to grab and map "
-				"lower page with index [0x%.16x]; rc = [%d]\n",
-				lower_page_idx, rc);
-			goto out;
-		}
-	}
-out:
-	return rc;
-}
-
 /**
  * ecryptfs_lower_offset_for_extent
  *
@@ -1306,43 +1193,6 @@ int ecryptfs_cipher_code_to_string(char *str, u16 cipher_code)
 	return rc;
 }
 
-/**
- * ecryptfs_read_header_region
- * @data: The virtual address to write header region data into
- * @dentry: The lower dentry
- * @mnt: The lower VFS mount
- *
- * Returns zero on success; non-zero otherwise
- */
-static int ecryptfs_read_header_region(char *data, struct dentry *dentry,
-				       struct vfsmount *mnt)
-{
-	struct file *lower_file;
-	mm_segment_t oldfs;
-	int rc;
-
-	rc = ecryptfs_open_lower_file(&lower_file, dentry, mnt, O_RDONLY);
-	if (rc) {
-		printk(KERN_ERR
-		       "Error opening lower_file to read header region\n");
-		goto out;
-	}
-	lower_file->f_pos = 0;
-	oldfs = get_fs();
-	set_fs(get_ds());
-	rc = lower_file->f_op->read(lower_file, (char __user *)data,
-			      ECRYPTFS_DEFAULT_EXTENT_SIZE, &lower_file->f_pos);
-	set_fs(oldfs);
-	rc = ecryptfs_close_lower_file(lower_file);
-	if (rc) {
-		printk(KERN_ERR "Error closing lower_file\n");
-		goto out;
-	}
-	rc = 0;
-out:
-	return rc;
-}
-
 int ecryptfs_read_and_validate_header_region(char *data,
 					     struct inode *ecryptfs_inode)
 {

fs/ecryptfs/ecryptfs_kernel.h

@@ -552,22 +552,7 @@ void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 void ecryptfs_destroy_mount_crypt_stat(
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
-int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptefs_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
-ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
-			   struct file *lower_file, int byte_offset,
-			   int region_size);
-int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
-				struct file *lower_file);
-int ecryptfs_do_readpage(struct file *file, struct page *page,
-			 pgoff_t lower_page_index);
-int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
-					      struct inode *lower_inode,
-					      struct writeback_control *wbc);
+int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
 int ecryptfs_encrypt_page(struct page *page);
 int ecryptfs_decrypt_page(struct page *page);
 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry);
@@ -591,10 +576,6 @@ 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);
-int ecryptfs_open_lower_file(struct file **lower_file,
-			     struct dentry *lower_dentry,
-			     struct vfsmount *lower_mnt, int flags);
-int ecryptfs_close_lower_file(struct file *lower_file);
 ssize_t ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
 			  size_t size);
 ssize_t

fs/ecryptfs/file.c

@@ -141,34 +141,6 @@ static int ecryptfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 
 struct kmem_cache *ecryptfs_file_info_cache;
 
-int ecryptfs_open_lower_file(struct file **lower_file,
-			     struct dentry *lower_dentry,
-			     struct vfsmount *lower_mnt, int flags)
-{
-	int rc = 0;
-
-	flags |= O_LARGEFILE;
-	dget(lower_dentry);
-	mntget(lower_mnt);
-	*lower_file = dentry_open(lower_dentry, lower_mnt, flags);
-	if (IS_ERR(*lower_file)) {
-		printk(KERN_ERR "Error opening lower file for lower_dentry "
-		       "[0x%p], lower_mnt [0x%p], and flags [0x%x]\n",
-		       lower_dentry, lower_mnt, flags);
-		rc = PTR_ERR(*lower_file);
-		*lower_file = NULL;
-		goto out;
-	}
-out:
-	return rc;
-}
-
-int ecryptfs_close_lower_file(struct file *lower_file)
-{
-	fput(lower_file);
-	return 0;
-}
-
 /**
  * ecryptfs_open
  * @inode: inode speciying file to open

fs/ecryptfs/main.c

@@ -670,11 +670,6 @@ static struct ecryptfs_cache_info {
 		.name = "ecryptfs_xattr_cache",
 		.size = PAGE_CACHE_SIZE,
 	},
-	{
-		.cache = &ecryptfs_lower_page_cache,
-		.name = "ecryptfs_lower_page_cache",
-		.size = PAGE_CACHE_SIZE,
-	},
 	{
 		.cache = &ecryptfs_key_record_cache,
 		.name = "ecryptfs_key_record_cache",