eCryptfs: use page_alloc not kmalloc to get a page of memory

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

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 7b99917ffadc05e07dd480e54aaec385c378298c..06db79d05c1262a8de76fc9dcb820b910b464163 100644 (file)
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -475,8 +475,8 @@ int ecryptfs_encrypt_page(struct page *page)
 {
        struct inode *ecryptfs_inode;
        struct ecryptfs_crypt_stat *crypt_stat;
-       char *enc_extent_virt = NULL;
-       struct page *enc_extent_page;
+       char *enc_extent_virt;
+       struct page *enc_extent_page = NULL;
        loff_t extent_offset;
        int rc = 0;
 
@@ -492,14 +492,14 @@ int ecryptfs_encrypt_page(struct page *page)
                               page->index);
                goto out;
        }
-       enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
-       if (!enc_extent_virt) {
+       enc_extent_page = alloc_page(GFP_USER);
+       if (!enc_extent_page) {
                rc = -ENOMEM;
                ecryptfs_printk(KERN_ERR, "Error allocating memory for "
                                "encrypted extent\n");
                goto out;
        }
-       enc_extent_page = virt_to_page(enc_extent_virt);
+       enc_extent_virt = kmap(enc_extent_page);
        for (extent_offset = 0;
             extent_offset < (PAGE_CACHE_SIZE / crypt_stat->extent_size);
             extent_offset++) {
@@ -527,7 +527,10 @@ int ecryptfs_encrypt_page(struct page *page)
                }
        }
 out:
-       kfree(enc_extent_virt);
+       if (enc_extent_page) {
+               kunmap(enc_extent_page);
+               __free_page(enc_extent_page);
+       }
        return rc;
 }
 
@@ -609,8 +612,8 @@ int ecryptfs_decrypt_page(struct page *page)
 {
        struct inode *ecryptfs_inode;
        struct ecryptfs_crypt_stat *crypt_stat;
-       char *enc_extent_virt = NULL;
-       struct page *enc_extent_page;
+       char *enc_extent_virt;
+       struct page *enc_extent_page = NULL;
        unsigned long extent_offset;
        int rc = 0;
 
@@ -627,14 +630,14 @@ int ecryptfs_decrypt_page(struct page *page)
                               page->index);
                goto out;
        }
-       enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
-       if (!enc_extent_virt) {
+       enc_extent_page = alloc_page(GFP_USER);
+       if (!enc_extent_page) {
                rc = -ENOMEM;
                ecryptfs_printk(KERN_ERR, "Error allocating memory for "
                                "encrypted extent\n");
                goto out;
        }
-       enc_extent_page = virt_to_page(enc_extent_virt);
+       enc_extent_virt = kmap(enc_extent_page);
        for (extent_offset = 0;
             extent_offset < (PAGE_CACHE_SIZE / crypt_stat->extent_size);
             extent_offset++) {
@@ -662,7 +665,10 @@ int ecryptfs_decrypt_page(struct page *page)
                }
        }
 out:
-       kfree(enc_extent_virt);
+       if (enc_extent_page) {
+               kunmap(enc_extent_page);
+               __free_page(enc_extent_page);
+       }
        return rc;
 }