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Qu Wenruo
1c94674b25
The flag EXTENT_NOWAIT is a special flag to notify extent-io-tree code that this operation should not sleep for the extent state preallocation. However for btrfs_redirty_list_add(), all callers are able to sleep: - clean_log_buffer() Just 2 lines before, we call btrfs_pin_reserved_extent(), which calls pin_down_extent(), and that function does not require EXTENT_NOWAIT. Thus we're safe to call it without EXTENT_NOWAIT. - btrfs_free_tree_block() This function have several call sites which trigger tree read, e.g. walk_up_proc(), thus we're safe to call it without EXTENT_NOWAIT. Thus there is no need to require EXTENT_NOWAIT flag. Signed-off-by: Qu Wenruo <wqu@suse.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.