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7503b83d80
The allocation happens with GFP_KERNEL after a transaction has been started, this can potentially cause deadlock if reclaim tries to get the memory by flushing filesystem data. The fs_info::qgroup_ulist is not used during transaction start when quotas are not enabled. The status bit BTRFS_FS_QUOTA_ENABLED is set later in btrfs_quota_enable so it's safe to move it before the transaction start. Reviewed-by: Filipe Manana <fdmanana@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.