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f8b6cd66e4The previous patch series only enabled the creation of detached mounts
from detached mounts that were created via open_tree(). In such cases we
know that the origin sequence number for the newly created anonymous
mount namespace will be set to the sequence number of the mount
namespace the source mount belonged to.
But fsmount() creates an anonymous mount namespace that does not have an
origin mount namespace as the anonymous mount namespace was derived from
a filesystem context created via fsopen().
Account for this case and allow the creation of detached mounts from
mounts created via fsmount(). Consequently, any such detached mount
created from an fsmount() mount will also have a zero origin sequence
number.
This allows to mount subdirectories without ever having to expose the
filesystem to a a non-anonymous mount namespace:
fd_context = sys_fsopen("tmpfs", 0);
sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0);
fd_tmpfs = sys_fsmount(fd_context, 0, 0);
mkdirat(fd_tmpfs, "subdir", 0755);
fd_tree = sys_open_tree(fd_tmpfs, "subdir", OPEN_TREE_CLONE);
sys_move_mount(fd_tree, "", -EBADF, "/mnt", MOVE_MOUNT_F_EMPTY_PATH);
Signed-off-by: Christian Brauner <brauner@kernel.org>
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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.