849eae5e57
btrfs_prepare_sprout() splices seed devices into its own struct fs_devices, so that its parent function btrfs_init_new_device() can add the new sprout device to fs_info->fs_devices. Both btrfs_prepare_sprout() and btrfs_init_new_device() need device_list_mutex. But they are holding it separately, thus create a small race window. Close it and hold device_list_mutex across both functions btrfs_init_new_device() and btrfs_prepare_sprout(). Split btrfs_prepare_sprout() into btrfs_init_sprout() and btrfs_setup_sprout(). This split is essential because device_list_mutex must not be held for allocations in btrfs_init_sprout() but must be held for btrfs_setup_sprout(). So now a common device_list_mutex can be used between btrfs_init_new_device() and btrfs_setup_sprout(). Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@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 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.