Messages in this thread Patch in this message | | | From | Luis Henriques <> | Subject | [PATCH 3.16.y-ckt 017/170] ext4: fix mmap data corruption when blocksize < pagesize | Date | Tue, 11 Nov 2014 11:06:16 +0000 |
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3.16.7-ckt1 -stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara <jack@suse.cz>
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@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Luis Henriques <luis.henriques@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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