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e917ff56c8
The writeback_control structure already passes down the information about a writeback being synchronous from the core VM code, and thus information is propagated into the bio REQ_SYNC flag through the wbc_to_write_flags helper. Use that information to decide if checksums calculation is offloaded to a workqueue instead of btrfs_inode::sync_writers field that not only bloats the inode but also has too wide scope, being inode wide instead of limited to the actual writeback request. The sync writes were set in: - btrfs_do_write_iter - regular IO, sync status is set - start_ordered_ops - ordered write start, writeback with WB_SYNC_ALL mode - btrfs_write_marked_extents - write marked extents, writeback with WB_SYNC_ALL mode Reviewed-by: Chris Mason <clm@fb.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Sterba <dsterba@suse.com> [ update changelog ] 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.