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[CURRENT BEHAVIOR] Currently inside btrfs_get_tree_subvol(), we call fc_mount() to grab a tree, then re-lock s_umount inside btrfs_reconfigure_for_mount() to avoid race with remount. However fc_mount() itself is just doing two things: 1. Call vfs_get_tree() 2. Release s_umount then call vfs_create_mount() [ENHANCEMENT] Instead of calling fc_mount(), we can open-code it with vfs_get_tree() first. This provides a benefit that, since we have the full control of s_umount, we do not need to re-lock that rw_sempahore when calling btrfs_reconfigure_for_mount(), meaning less race between RO/RW remount. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Reviewed-by: Qu Wenruo <wqu@suse.com> [ Rework the subject and commit message, refactor the error handling ] Signed-off-by: Qu Wenruo <wqu@suse.com> Tested-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.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 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.