997336f2c3
truncate should copy up full file (and not do metacopy only), otherwise it will be broken. For example, use truncate to increase size of a file so that any read beyong existing size will return null bytes. If we don't copy up full file, then we end up opening lower file and read from it only reads upto the old size (and not new size after truncate). Hence to avoid such situations, copy up data as well when file size changes. So far it was being done by d_real(O_WRONLY) call in truncate() path. Now that patch has been reverted. So force full copy up in ovl_setattr() if size of file is changing. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.