Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jikos/hid

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

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 3a6f65c3f14fc2fb26aa77df1ba8f10cae7198b7..7be8e91b5ba08cd93c70ffe30a074ad6e4a93fc4 100644 (file)
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -238,7 +238,6 @@ int ecryptfs_do_readpage(struct file *file, struct page *page,
        lower_page_data = kmap_atomic(lower_page, KM_USER1);
        memcpy(page_data, lower_page_data, PAGE_CACHE_SIZE);
        kunmap_atomic(lower_page_data, KM_USER1);
-       flush_dcache_page(lower_page);
        kunmap_atomic(page_data, KM_USER0);
        flush_dcache_page(page);
        rc = 0;
@@ -422,9 +421,11 @@ out:
        return rc;
 }
 
-static void ecryptfs_release_lower_page(struct page *lower_page)
+static
+void ecryptfs_release_lower_page(struct page *lower_page, int page_locked)
 {
-       unlock_page(lower_page);
+       if (page_locked)
+               unlock_page(lower_page);
        page_cache_release(lower_page);
 }
 
@@ -454,6 +455,13 @@ static int ecryptfs_write_inode_size_to_header(struct file *lower_file,
        }
        lower_a_ops = lower_inode->i_mapping->a_ops;
        rc = lower_a_ops->prepare_write(lower_file, header_page, 0, 8);
+       if (rc) {
+               if (rc == AOP_TRUNCATED_PAGE)
+                       ecryptfs_release_lower_page(header_page, 0);
+               else
+                       ecryptfs_release_lower_page(header_page, 1);
+               goto out;
+       }
        file_size = (u64)i_size_read(inode);
        ecryptfs_printk(KERN_DEBUG, "Writing size: [0x%.16x]\n", file_size);
        file_size = cpu_to_be64(file_size);
@@ -465,7 +473,10 @@ static int ecryptfs_write_inode_size_to_header(struct file *lower_file,
        if (rc < 0)
                ecryptfs_printk(KERN_ERR, "Error commiting header page "
                                "write\n");
-       ecryptfs_release_lower_page(header_page);
+       if (rc == AOP_TRUNCATED_PAGE)
+               ecryptfs_release_lower_page(header_page, 0);
+       else
+               ecryptfs_release_lower_page(header_page, 1);
        lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
        mark_inode_dirty_sync(inode);
 out:
@@ -572,7 +583,10 @@ int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
        }
 out:
        if (rc && (*lower_page)) {
-               ecryptfs_release_lower_page(*lower_page);
+               if (rc == AOP_TRUNCATED_PAGE)
+                       ecryptfs_release_lower_page(*lower_page, 0);
+               else
+                       ecryptfs_release_lower_page(*lower_page, 1);
                (*lower_page) = NULL;
        }
        return rc;
@@ -588,16 +602,19 @@ ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
                           struct file *lower_file, int byte_offset,
                           int region_size)
 {
+       int page_locked = 1;
        int rc = 0;
 
        rc = lower_inode->i_mapping->a_ops->commit_write(
                lower_file, lower_page, byte_offset, region_size);
+       if (rc == AOP_TRUNCATED_PAGE)
+               page_locked = 0;
        if (rc < 0) {
                ecryptfs_printk(KERN_ERR,
                                "Error committing write; rc = [%d]\n", rc);
        } else
                rc = 0;
-       ecryptfs_release_lower_page(lower_page);
+       ecryptfs_release_lower_page(lower_page, page_locked);
        return rc;
 }