Jan Kara 81d73a32d7 mm: fix writeback_in_progress() ... Commit 83ba7b071f ("writeback: simplify the write back thread queue") broke writeback_in_progress() as in that commit we started to remove work items from the list at the moment we start working on them and not at the moment they are finished. Thus if the flusher thread was doing some work but there was no other work queued, writeback_in_progress() returned false. This could in particular cause unnecessary queueing of background writeback from balance_dirty_pages() or writeout work from writeback_sb_if_idle(). This patch fixes the problem by introducing a bit in the bdi state which indicates that the flusher thread is processing some work and uses this bit for writeback_in_progress() test. NOTE: Both callsites of writeback_in_progress() (namely, writeback_inodes_sb_if_idle() and balance_dirty_pages()) would actually need a different information than what writeback_in_progress() provides. They would need to know whether *the kind of writeback they are going to submit* is already queued. But this information isn't that simple to provide so let's fix writeback_in_progress() for the time being. Signed-off-by: Jan Kara <jack@suse.cz> Cc: Christoph Hellwig <hch@lst.de> Cc: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Jens Axboe <jaxboe@fusionio.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-08-12 08:43:30 -07:00
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acpi	acpi: fix bogus preemption logic	2010-08-12 08:43:29 -07:00
asm-generic	dma-mapping: remove dma_is_consistent API	2010-08-11 08:59:21 -07:00
crypto
drm
keys
linux	mm: fix writeback_in_progress()	2010-08-12 08:43:30 -07:00
math-emu
media	V4L/DVB: cx2341x: convert to the control framework	2010-08-08 23:43:05 -03:00
mtd
net
pcmcia
rdma
rxrpc
scsi	scsi: use __uX types for headers exported to user space	2010-08-11 08:59:01 -07:00
sound
trace	Merge branch 'for-2.6.36' of git://git.kernel.dk/linux-2.6-block	2010-08-10 15:22:42 -07:00
video
xen
Kbuild