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9086b2d9e9
Alyssa Ross <hi@alyssa.is> requested that virtiofs notifies userspace when filesytems become available. This can be used to detect when a filesystem with a given tag is hotplugged, for example. uevents allow userspace to detect changes without resorting to polling. The tag is included as a uevent property so it's easy for userspace to identify the filesystem in question even when the sysfs directory goes away during removal. Here are example uevents: # udevadm monitor -k -p KERNEL[111.113221] add /fs/virtiofs/2 (virtiofs) ACTION=add DEVPATH=/fs/virtiofs/2 SUBSYSTEM=virtiofs TAG=test KERNEL[165.527167] remove /fs/virtiofs/2 (virtiofs) ACTION=remove DEVPATH=/fs/virtiofs/2 SUBSYSTEM=virtiofs TAG=test Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Vivek Goyal <vgoyal@redhat.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.
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.