ext4: fix mmap data corruption when blocksize < pagesize

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>
Cc: stable@vger.kernel.org
This commit is contained in:
Jan Kara 2014-10-01 21:49:46 -04:00 committed by Theodore Ts'o
parent 90a8020278
commit d6320cbfc9

View File

@ -4514,8 +4514,12 @@ 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