[3.16.y-ckt extended stable] Patch "ext4: fix mmap data corruption when blocksize < pagesize" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Mon Nov 10 11:31:10 UTC 2014
This is a note to let you know that I have just added a patch titled
ext4: fix mmap data corruption when blocksize < pagesize
to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue
This patch is scheduled to be released in version 3.16.7-ckt1.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 6c49ff6fb47a841d5e017d33192f8116d8536297 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack at suse.cz>
Date: Wed, 1 Oct 2014 21:49:46 -0400
Subject: ext4: fix mmap data corruption when blocksize < pagesize
commit d6320cbfc92910a3e5f10c42d98c231c98db4f60 upstream.
Use truncate_isize_extended() when hole is being created in a file so that
->page_mkwrite() will get called for the partial tail page if it is
mmaped (see the first patch in the series for details).
Signed-off-by: Jan Kara <jack at suse.cz>
Signed-off-by: Theodore Ts'o <tytso at mit.edu>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
fs/ext4/inode.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e9c9b5bd906a..14f34b02dde5 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4654,8 +4654,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
ext4_orphan_del(NULL, inode);
goto err_out;
}
- } else
+ } else {
+ loff_t oldsize = inode->i_size;
+
i_size_write(inode, attr->ia_size);
+ pagecache_isize_extended(inode, oldsize, inode->i_size);
+ }
/*
* Blocks are going to be removed from the inode. Wait
--
2.1.0
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