fs: remove some AOP_TRUNCATED_PAGE

prepare/commit_write no longer returns AOP_TRUNCATED_PAGE since OCFS2 and
GFS2 were converted to the new aops, so we can make some simplifications
for that.

[michal.k.k.piotrowski@gmail.com: fix warning]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 30 deletions

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index fd3f94d..aaea55a 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -446,11 +446,9 @@ out:
 	return rc;
 }
 
-static
-void ecryptfs_release_lower_page(struct page *lower_page, int page_locked)
+static void ecryptfs_release_lower_page(struct page *lower_page)
 {
-	if (page_locked)
-		unlock_page(lower_page);
+	unlock_page(lower_page);
 	page_cache_release(lower_page);
 }
 
@@ -471,7 +469,6 @@ static int ecryptfs_write_inode_size_to_header(struct file *lower_file,
 	const struct address_space_operations *lower_a_ops;
 	u64 file_size;
 
-retry:
 	header_page = grab_cache_page(lower_inode->i_mapping, 0);
 	if (!header_page) {
 		ecryptfs_printk(KERN_ERR, "grab_cache_page for "
@@ -482,11 +479,7 @@ retry:
 	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);
-			goto retry;
-		} else
-			ecryptfs_release_lower_page(header_page, 1);
+		ecryptfs_release_lower_page(header_page);
 		goto out;
 	}
 	file_size = (u64)i_size_read(inode);
@@ -500,11 +493,7 @@ retry:
 	if (rc < 0)
 		ecryptfs_printk(KERN_ERR, "Error commiting header page "
 				"write\n");
-	if (rc == AOP_TRUNCATED_PAGE) {
-		ecryptfs_release_lower_page(header_page, 0);
-		goto retry;
-	} else
-		ecryptfs_release_lower_page(header_page, 1);
+	ecryptfs_release_lower_page(header_page);
 	lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
 	mark_inode_dirty_sync(inode);
 out:
@@ -593,7 +582,6 @@ int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
 {
 	int rc = 0;
 
-retry:
 	*lower_page = grab_cache_page(lower_inode->i_mapping, lower_page_index);
 	if (!(*lower_page)) {
 		rc = -EINVAL;
@@ -607,16 +595,11 @@ retry:
 							  byte_offset,
 							  region_bytes);
 	if (rc) {
-		if (rc == AOP_TRUNCATED_PAGE) {
-			ecryptfs_release_lower_page(*lower_page, 0);
-			goto retry;
-		} else {
-			ecryptfs_printk(KERN_ERR, "prepare_write for "
-				"lower_page_index = [0x%.16x] failed; rc = "
-				"[%d]\n", lower_page_index, rc);
-			ecryptfs_release_lower_page(*lower_page, 1);
-			(*lower_page) = NULL;
-		}
+		ecryptfs_printk(KERN_ERR, "prepare_write for "
+			"lower_page_index = [0x%.16x] failed; rc = "
+			"[%d]\n", lower_page_index, rc);
+		ecryptfs_release_lower_page(*lower_page);
+		(*lower_page) = NULL;
 	}
 out:
 	return rc;
@@ -632,19 +615,16 @@ 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, page_locked);
+	ecryptfs_release_lower_page(lower_page);
 	return rc;
 }