Please backport to 4.1: ext4: only call ext4_truncate when size <= isize

["Theodore Ts'o" <tytso@xxxxxxx>]

Hi, I'd appreciate it if you could backport upstream commit:

   3da40c7b0898: ext4: only call ext4_truncate when size <= isize

to the 4.1.x stable kernel series.  This fixes an xfstests test
failure: generic/092

Enclosed is the backport for 4.1, since the upstream commit doesn't
apply automatically.

	  	     	       	    	  - Ted

>From c603bef1db329ecf285bf7fd137f63ce0aee2206 Mon Sep 17 00:00:00 2001
From: Josef Bacik <jbacik@xxxxxx>
Date: Mon, 22 Jun 2015 00:31:26 -0400
Subject: [PATCH] ext4: only call ext4_truncate when size <= isize

At LSF we decided that if we truncate up from isize we shouldn't trim
fallocated blocks that were fallocated with KEEP_SIZE and are past the
new i_size.  This patch fixes ext4 to do this.

[ Completely reworked patch so that i_disksize would actually get set
  when truncating up.  Also reworked the code for handling truncate so
  that it's easier to handle. -- tytso ]

Signed-off-by: Josef Bacik <jbacik@xxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Reviewed-by: Lukas Czerner <lczerner@xxxxxxxxxx>
---
 fs/ext4/inode.c | 38 ++++++++++++++++++--------------------
 1 file changed, 18 insertions(+), 20 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 2ab9fd88a7c3..df8bef51e2d1 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4785,8 +4785,10 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 		ext4_journal_stop(handle);
 	}
 
-	if (attr->ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
+	if (attr->ia_valid & ATTR_SIZE) {
 		handle_t *handle;
+		loff_t oldsize = inode->i_size;
+		int shrink = (attr->ia_size <= inode->i_size);
 
 		if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
 			struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
@@ -4794,24 +4796,26 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 			if (attr->ia_size > sbi->s_bitmap_maxbytes)
 				return -EFBIG;
 		}
+		if (!S_ISREG(inode->i_mode))
+			return -EINVAL;
 
 		if (IS_I_VERSION(inode) && attr->ia_size != inode->i_size)
 			inode_inc_iversion(inode);
 
-		if (S_ISREG(inode->i_mode) &&
+		if (ext4_should_order_data(inode) &&
 		    (attr->ia_size < inode->i_size)) {
-			if (ext4_should_order_data(inode)) {
-				error = ext4_begin_ordered_truncate(inode,
+			error = ext4_begin_ordered_truncate(inode,
 							    attr->ia_size);
-				if (error)
-					goto err_out;
-			}
+			if (error)
+				goto err_out;
+		}
+		if (attr->ia_size != inode->i_size) {
 			handle = ext4_journal_start(inode, EXT4_HT_INODE, 3);
 			if (IS_ERR(handle)) {
 				error = PTR_ERR(handle);
 				goto err_out;
 			}
-			if (ext4_handle_valid(handle)) {
+			if (ext4_handle_valid(handle) && shrink) {
 				error = ext4_orphan_add(handle, inode);
 				orphan = 1;
 			}
@@ -4830,15 +4834,13 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 			up_write(&EXT4_I(inode)->i_data_sem);
 			ext4_journal_stop(handle);
 			if (error) {
-				ext4_orphan_del(NULL, inode);
+				if (orphan)
+					ext4_orphan_del(NULL, inode);
 				goto err_out;
 			}
-		} else {
-			loff_t oldsize = inode->i_size;
-
-			i_size_write(inode, attr->ia_size);
-			pagecache_isize_extended(inode, oldsize, inode->i_size);
 		}
+		if (!shrink)
+			pagecache_isize_extended(inode, oldsize, inode->i_size);
 
 		/*
 		 * Blocks are going to be removed from the inode. Wait
@@ -4860,13 +4862,9 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 		 */
 		truncate_pagecache(inode, inode->i_size);
 		up_write(&EXT4_I(inode)->i_mmap_sem);
+		if (shrink)
+			ext4_truncate(inode);
 	}
-	/*
-	 * We want to call ext4_truncate() even if attr->ia_size ==
-	 * inode->i_size for cases like truncation of fallocated space
-	 */
-	if (attr->ia_valid & ATTR_SIZE)
-		ext4_truncate(inode);
 
 	if (!rc) {
 		setattr_copy(inode, attr);
-- 
2.11.0.rc0.7.gbe5a750