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b4a76faf9d
Two kinds of objects there - ptmx and everything else (pty). The former is
created on mount and kept until the fs shutdown; the latter get created
and removed by tty layer (the references are borrowed into tty->driver_data).
The reference to ptmx dentry is also kept, but we only ever use it to
find ptmx inode on remount.
* turn d_add() into d_make_persistent() + dput() both in mknod_ptmx() and
in devpts_pty_new().
* turn dput() to d_make_discardable() in devpts_pty_kill().
* switch mknod_ptmx() to simple_{start,done}_creating().
* instead of storing in pts_fs_info a reference to ptmx dentry, store a reference
to its inode, seeing that this is what we use it for.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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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.