Merge branches 'release', 'acpi_pm_device_sleep_state' and 'battery' into release

[linux-2.6-omap-h63xx.git] / fs / ecryptfs / mmap.c

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 32c5711d79a320593e9a536590f3b347905055bd..dc74b186145d74db8a56470d5ef2e63ea5c0a3c0 100644 (file)
--- a/fs/ecryptfs/mmap.c
+++ b/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
  *
@@ -102,13 +100,14 @@ static void set_header_info(char *page_virt,
                            struct ecryptfs_crypt_stat *crypt_stat)
 {
        size_t written;
-       int save_num_header_extents_at_front =
-               crypt_stat->num_header_extents_at_front;
+       size_t save_num_header_bytes_at_front =
+               crypt_stat->num_header_bytes_at_front;
 
-       crypt_stat->num_header_extents_at_front = 1;
+       crypt_stat->num_header_bytes_at_front =
+               ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE;
        ecryptfs_write_header_metadata(page_virt + 20, crypt_stat, &written);
-       crypt_stat->num_header_extents_at_front =
-               save_num_header_extents_at_front;
+       crypt_stat->num_header_bytes_at_front =
+               save_num_header_bytes_at_front;
 }
 
 /**
@@ -134,8 +133,11 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page,
                loff_t view_extent_num = ((((loff_t)page->index)
                                           * num_extents_per_page)
                                          + extent_num_in_page);
+               size_t num_header_extents_at_front =
+                       (crypt_stat->num_header_bytes_at_front
+                        / crypt_stat->extent_size);
 
-               if (view_extent_num < crypt_stat->num_header_extents_at_front) {
+               if (view_extent_num < num_header_extents_at_front) {
                        /* This is a header extent */
                        char *page_virt;
 
@@ -157,9 +159,8 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page,
                } 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);
+                               ((view_extent_num * crypt_stat->extent_size)
+                                - crypt_stat->num_header_bytes_at_front);
 
                        rc = ecryptfs_read_lower_page_segment(
                                page, (lower_offset >> PAGE_CACHE_SHIFT),
@@ -257,8 +258,7 @@ static int fill_zeros_to_end_of_page(struct page *page, unsigned int to)
        end_byte_in_page = i_size_read(inode) % PAGE_CACHE_SIZE;
        if (to > end_byte_in_page)
                end_byte_in_page = to;
-       zero_user_page(page, end_byte_in_page,
-               PAGE_CACHE_SIZE - end_byte_in_page, KM_USER0);
+       zero_user_segment(page, end_byte_in_page, PAGE_CACHE_SIZE);
 out:
        return 0;
 }
@@ -307,7 +307,7 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
         */
        if ((i_size_read(page->mapping->host) == prev_page_end_size) &&
            (from != 0)) {
-               zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+               zero_user(page, 0, PAGE_CACHE_SIZE);
        }
 out:
        return rc;