fs/ecryptfs/: possible cleanups

- make the following needlessly global code static:
  - crypto.c:ecryptfs_lower_offset_for_extent()
  - crypto.c:key_tfm_list
  - crypto.c:key_tfm_list_mutex
  - inode.c:ecryptfs_getxattr()
  - main.c:ecryptfs_init_persistent_file()

- remove the no longer used mmap.c:ecryptfs_lower_page_cache

- #if 0 the unused read_write.c:ecryptfs_read()
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: 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

@@ -376,7 +376,7 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
  *
  * Convert an eCryptfs page index into a lower byte offset
  */
-void ecryptfs_lower_offset_for_extent(loff_t *offset, loff_t extent_num,
+static void ecryptfs_lower_offset_for_extent(loff_t *offset, loff_t extent_num,
 					     struct ecryptfs_crypt_stat *crypt_stat)
 {
 	(*offset) = ((crypt_stat->extent_size
@@ -1802,8 +1802,8 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
 }
 
 struct kmem_cache *ecryptfs_key_tfm_cache;
-struct list_head key_tfm_list;
-struct mutex key_tfm_list_mutex;
+static struct list_head key_tfm_list;
+static struct mutex key_tfm_list_mutex;
 
 int ecryptfs_init_crypto(void)
 {

fs/ecryptfs/ecryptfs_kernel.h

@@ -322,9 +322,6 @@ struct ecryptfs_key_tfm {
 	unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 };
 
-extern struct list_head key_tfm_list;
-extern struct mutex key_tfm_list_mutex;
-
 /**
  * This struct is to enable a mount-wide passphrase/salt combo. This
  * is more or less a stopgap to provide similar functionality to other
@@ -525,7 +522,6 @@ extern struct kmem_cache *ecryptfs_header_cache_0;
 extern struct kmem_cache *ecryptfs_header_cache_1;
 extern struct kmem_cache *ecryptfs_header_cache_2;
 extern struct kmem_cache *ecryptfs_xattr_cache;
-extern struct kmem_cache *ecryptfs_lower_page_cache;
 extern struct kmem_cache *ecryptfs_key_record_cache;
 extern struct kmem_cache *ecryptfs_key_sig_cache;
 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
@@ -576,8 +572,6 @@ 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);
-ssize_t ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
-			  size_t size);
 ssize_t
 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
 			void *value, size_t size);
@@ -631,8 +625,6 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 				      char *sig);
 int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start,
 			 int num_zeros);
-void ecryptfs_lower_offset_for_extent(loff_t *offset, loff_t extent_num,
-				      struct ecryptfs_crypt_stat *crypt_stat);
 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 			 loff_t offset, size_t size);
 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
@@ -646,8 +638,6 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 				     pgoff_t page_index,
 				     size_t offset_in_page, size_t size,
 				     struct inode *ecryptfs_inode);
-int ecryptfs_read(char *data, loff_t offset, size_t size,
-		  struct file *ecryptfs_file);
 struct page *ecryptfs_get_locked_page(struct file *file, loff_t index);
 
 #endif /* #ifndef ECRYPTFS_KERNEL_H */

fs/ecryptfs/inode.c

@@ -954,7 +954,7 @@ ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
 	return rc;
 }
 
-ssize_t
+static ssize_t
 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
 		  size_t size)
 {

fs/ecryptfs/main.c

@@ -117,7 +117,7 @@ void __ecryptfs_printk(const char *fmt, ...)
  *
  * Returns zero on success; non-zero otherwise
  */
-int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
+static int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
 {
 	struct ecryptfs_inode_info *inode_info =
 		ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);

fs/ecryptfs/mmap.c

@@ -34,8 +34,6 @@
 #include <linux/scatterlist.h>
 #include "ecryptfs_kernel.h"
 
-struct kmem_cache *ecryptfs_lower_page_cache;
-
 /**
  * ecryptfs_get_locked_page
  *

fs/ecryptfs/read_write.c

@@ -293,6 +293,7 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 	return rc;
 }
 
+#if 0
 /**
  * ecryptfs_read
  * @data: The virtual address into which to write the data read (and
@@ -371,3 +372,4 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
 out:
 	return rc;
 }
+#endif  /*  0  */