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writeback: make writeback_control.nr_to_write straight

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Pass struct wb_writeback_work all the way down to writeback_sb_inodes(),
and initialize the struct writeback_control there.

struct writeback_control is basically designed to control writeback of a
single file, but we keep abuse it for writing multiple files in
writeback_sb_inodes() and its callers.

It immediately clean things up, e.g. suddenly wbc.nr_to_write vs
work->nr_pages starts to make sense, and instead of saving and restoring
pages_skipped in writeback_sb_inodes it can always start with a clean
zero value.

It also makes a neat IO pattern change: large dirty files are now
written in the full 4MB writeback chunk size, rather than whatever
remained quota in wbc->nr_to_write.

Acked-by: Jan Kara <jack@suse.cz>
Proposed-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
This commit is contained in:
Wu Fengguang 2011-05-04 19:54:37 -06:00
parent 36715cef07
commit d46db3d582
6 changed files with 148 additions and 129 deletions
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17
mm/backing-dev.c
View file

@ -260,18 +260,6 @@ int bdi_has_dirty_io(struct backing_dev_info *bdi)
return wb_has_dirty_io(&bdi->wb);
}
static void bdi_flush_io(struct backing_dev_info *bdi)
{
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
.older_than_this = NULL,
.range_cyclic = 1,
.nr_to_write = 1024,
};
writeback_inodes_wb(&bdi->wb, &wbc);
}
/*
* kupdated() used to do this. We cannot do it from the bdi_forker_thread()
* or we risk deadlocking on ->s_umount. The longer term solution would be
@ -457,9 +445,10 @@ static int bdi_forker_thread(void *ptr)
if (IS_ERR(task)) {
/*
* If thread creation fails, force writeout of
* the bdi from the thread.
* the bdi from the thread. Hopefully 1024 is
* large enough for efficient IO.
*/
bdi_flush_io(bdi);
writeback_inodes_wb(&bdi->wb, 1024);
} else {
/*
* The spinlock makes sure we do not lose