ecryptfs: use zero_user_page

Use zero_user_page() instead of open-coding it.

Signed-off-by: Nate Diller <nate.diller@gmail.com>
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>

1 files changed, 3 insertions, 11 deletions

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 0770c4b66f53..88ea6697908f 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -364,18 +364,14 @@ static int fill_zeros_to_end_of_page(struct page *page, unsigned int to)
 {
         struct inode *inode = page->mapping->host;
         int end_byte_in_page;
-        char *page_virt;
 
         if ((i_size_read(inode) / PAGE_CACHE_SIZE) != page->index)
                 goto out;
         end_byte_in_page = i_size_read(inode) % PAGE_CACHE_SIZE;
         if (to > end_byte_in_page)
                 end_byte_in_page = to;
-        page_virt = kmap_atomic(page, KM_USER0);
-        memset((page_virt + end_byte_in_page), 0,
-               (PAGE_CACHE_SIZE - end_byte_in_page));
-        kunmap_atomic(page_virt, KM_USER0);
-        flush_dcache_page(page);
+        zero_user_page(page, end_byte_in_page,
+                PAGE_CACHE_SIZE - end_byte_in_page, KM_USER0);
 out:
         return 0;
 }
@@ -740,7 +736,6 @@ int write_zeros(struct file *file, pgoff_t index, int start, int num_zeros)
 {
         int rc = 0;
         struct page *tmp_page;
-        char *tmp_page_virt;
 
         tmp_page = ecryptfs_get1page(file, index);
         if (IS_ERR(tmp_page)) {
@@ -757,10 +752,7 @@ int write_zeros(struct file *file, pgoff_t index, int start, int num_zeros)
                 page_cache_release(tmp_page);
                 goto out;
         }
-        tmp_page_virt = kmap_atomic(tmp_page, KM_USER0);
-        memset(((char *)tmp_page_virt + start), 0, num_zeros);
-        kunmap_atomic(tmp_page_virt, KM_USER0);
-        flush_dcache_page(tmp_page);
+        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 "