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authorChristoph Hellwig <hch@lst.de>2010-06-08 18:14:34 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-06-11 12:58:07 +0200
commit7f0e7bed936a0c422641a046551829a01341dd80 (patch)
tree6b5fd4a8e11253819c883e409b612fc26c57235e /fs/9p/vfs_dir.c
parentMerge branch 'kvm-updates/2.6.35' of git://git.kernel.org/pub/scm/virt/kvm/kvm (diff)
downloadlinux-7f0e7bed936a0c422641a046551829a01341dd80.tar.xz
linux-7f0e7bed936a0c422641a046551829a01341dd80.zip
writeback: fix writeback completion notifications
The code dealing with bdi_work->state and completion of a bdi_work is a major mess currently. This patch makes sure we directly use one set of flags to deal with it, and use it consistently, which means: - always notify about completion from the rcu callback. We only ever wait for it from on-stack callers, so this simplification does not even cause a theoretical slowdown currently. It also makes sure we don't miss out on the notification if we ever add other callers to wait for it. - make earlier completion notification depending on the on-stack allocation, not the sync mode. If we introduce new callers that want to do WB_SYNC_NONE writeback from on-stack callers this will be nessecary. Also rename bdi_wait_on_work_clear to bdi_wait_on_work_done and inline a few small functions into their only caller to make the code understandable. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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