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When the l2tp tunnel socket used sk_user_data to point to its
associated l2tp tunnel, socket and tunnel cleanup had to make use of
the socket's destructor to free the tunnel only when the socket could
no longer be accessed.
Now that sk_user_data is no longer used, we can simplify socket and
tunnel cleanup:
* If the tunnel closes first, it cleans up and drops its socket ref
when the tunnel refcount drops to zero. If its socket was provided
by userspace, the socket is closed and freed asynchronously, when
userspace closes it. If its socket is a kernel socket, the tunnel
closes the socket itself during cleanup and drops its socket ref
when the tunnel's refcount drops to zero.
* If the socket closes first, we initiate the closing of its
associated tunnel. For UDP sockets, this is via the socket's
encap_destroy hook. For L2TPIP sockets, this is via the socket's
destroy callback. The tunnel holds a socket ref while it
references the sock. When the tunnel is freed, it drops its socket
ref and the socket will be cleaned up when its own refcount drops
to zero, asynchronous to the tunnel free.
* The tunnel socket destructor is no longer needed since the tunnel
is no longer freed through the socket destructor.
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText 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.