This is a note to let you know that I've just added the patch titled
ext4: fix mmap data corruption when blocksize < pagesize
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-fix-mmap-data-corruption-when-blocksize-pagesize.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d6320cbfc92910a3e5f10c42d98c231c98db4f60 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@xxxxxxx>
Date: Wed, 1 Oct 2014 21:49:46 -0400
Subject: ext4: fix mmap data corruption when blocksize < pagesize
From: Jan Kara <jack@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/inode.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4536,8 +4536,12 @@ int ext4_setattr(struct dentry *dentry,
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
Patches currently in stable-queue which might be from jack@xxxxxxx are
queue-3.17/evm-check-xattr-value-length-and-type-in-evm_inode_setxattr.patch
queue-3.17/ext4-don-t-check-quota-format-when-there-are-no-quota-files.patch
queue-3.17/ext4-fix-oops-when-loading-block-bitmap-failed.patch
queue-3.17/vfs-fix-data-corruption-when-blocksize-pagesize-for-mmaped-data.patch
queue-3.17/ext4-fix-mmap-data-corruption-when-blocksize-pagesize.patch
queue-3.17/ext4-don-t-orphan-or-truncate-the-boot-loader-inode.patch
queue-3.17/ext4-fix-overflow-when-updating-superblock-backups-after-resize.patch
queue-3.17/ext4-grab-missed-write_count-for-ext4_ioc_swap_boot.patch
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