ecryptfs: clean up page flag handling

[safe/jmp/linux-2.6] / fs / ecryptfs / read_write.c

diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index 272eaeb..2150edf 100644 (file)
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -142,8 +142,8 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
                        if (num_bytes > total_remaining_zeros)
                                num_bytes = total_remaining_zeros;
                }
-               ecryptfs_page = ecryptfs_get1page(ecryptfs_file,
-                                                 ecryptfs_page_idx);
+               ecryptfs_page = ecryptfs_get_locked_page(ecryptfs_file,
+                                                        ecryptfs_page_idx);
                if (IS_ERR(ecryptfs_page)) {
                        rc = PTR_ERR(ecryptfs_page);
                        printk(KERN_ERR "%s: Error getting page at "
@@ -161,6 +161,7 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
                                printk(KERN_ERR "%s: Error decrypting "
                                       "page; rc = [%d]\n",
                                       __FUNCTION__, rc);
+                               ClearPageUptodate(ecryptfs_page);
                                page_cache_release(ecryptfs_page);
                                goto out;
                        }
@@ -180,14 +181,15 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
                }
                kunmap_atomic(ecryptfs_page_virt, KM_USER0);
                flush_dcache_page(ecryptfs_page);
+               SetPageUptodate(ecryptfs_page);
+               unlock_page(ecryptfs_page);
                rc = ecryptfs_encrypt_page(ecryptfs_page);
+               page_cache_release(ecryptfs_page);
                if (rc) {
                        printk(KERN_ERR "%s: Error encrypting "
                               "page; rc = [%d]\n", __FUNCTION__, rc);
-                       page_cache_release(ecryptfs_page);
                        goto out;
                }
-               page_cache_release(ecryptfs_page);
                pos += num_bytes;
        }
        if ((offset + size) > ecryptfs_file_size) {
@@ -225,7 +227,6 @@ int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
                ecryptfs_inode_to_private(ecryptfs_inode);
        ssize_t octets_read;
        mm_segment_t fs_save;
-       size_t i;
        int rc = 0;
 
        mutex_lock(&inode_info->lower_file_mutex);
@@ -242,16 +243,6 @@ int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
                rc = -EINVAL;
        }
        mutex_unlock(&inode_info->lower_file_mutex);
-       for (i = 0; i < size; i += PAGE_CACHE_SIZE) {
-               struct page *data_page;
-
-               data_page = virt_to_page(data + i);
-               flush_dcache_page(data_page);
-               if (rc)
-                       ClearPageUptodate(data_page);
-               else
-                       SetPageUptodate(data_page);
-       }
        return rc;
 }
 
@@ -283,6 +274,7 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
        virt = kmap(page_for_ecryptfs);
        rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);
        kunmap(page_for_ecryptfs);
+       flush_dcache_page(page_for_ecryptfs);
        return rc;
 }
 
@@ -331,8 +323,8 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
 
                if (num_bytes > total_remaining_bytes)
                        num_bytes = total_remaining_bytes;
-               ecryptfs_page = ecryptfs_get1page(ecryptfs_file,
-                                                 ecryptfs_page_idx);
+               ecryptfs_page = ecryptfs_get_locked_page(ecryptfs_file,
+                                                        ecryptfs_page_idx);
                if (IS_ERR(ecryptfs_page)) {
                        rc = PTR_ERR(ecryptfs_page);
                        printk(KERN_ERR "%s: Error getting page at "
@@ -345,6 +337,7 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
                if (rc) {
                        printk(KERN_ERR "%s: Error decrypting "
                               "page; rc = [%d]\n", __FUNCTION__, rc);
+                       ClearPageUptodate(ecryptfs_page);
                        page_cache_release(ecryptfs_page);
                        goto out;
                }
@@ -353,6 +346,9 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
                       ((char *)ecryptfs_page_virt + start_offset_in_page),
                       num_bytes);
                kunmap_atomic(ecryptfs_page_virt, KM_USER0);
+               flush_dcache_page(ecryptfs_page);
+               SetPageUptodate(ecryptfs_page);
+               unlock_page(ecryptfs_page);
                page_cache_release(ecryptfs_page);
                pos += num_bytes;
                data_offset += num_bytes;