mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-13 14:09:38 -04:00
0d0c71b317
The mount option alloc_start was used in the past for debugging and stressing the chunk allocator. Not meant to be used by users, so we're not breaking anybody's setup. There was some added complexity handling changes of the value and when it was not same as default. Such code has likely been untested and I think it's better to remove it. This patch kills all use of alloc_start, and by doing that also fixes a bug when alloc_size is set, potentially called from statfs: in btrfs_calc_avail_data_space, traversing the list in RCU, the RCU protection is temporarily dropped so btrfs_account_dev_extents_size can be called and then RCU is locked again! Doing that inside list_for_each_entry_rcu is just asking for trouble, but unlikely to be observed in practice. Signed-off-by: David Sterba <dsterba@suse.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.