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writeback: simplify and split bdi_start_writeback

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bdi_start_writeback now never gets a superblock passed, so we can just remove
that case.  And to further untangle the code and flatten the call stack
split it into two trivial helpers for it's two callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig 2010-06-08 18:15:15 +02:00 • committed by Jens Axboe
parent b8c2f3474f
commit c5444198ca
3 changed files with 24 additions and 17 deletions
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32
fs/fs-writeback.c
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@ -200,7 +200,6 @@ static void bdi_queue_work_onstack(struct wb_writeback_args *args)
/**
* bdi_start_writeback - start writeback
* @bdi: the backing device to write from
* @sb: write inodes from this super_block
* @nr_pages: the number of pages to write
*
* Description:
@ -209,25 +208,34 @@ static void bdi_queue_work_onstack(struct wb_writeback_args *args)
* completion. Caller need not hold sb s_umount semaphore.
*
*/
void bdi_start_writeback(struct backing_dev_info *bdi, struct super_block *sb,
long nr_pages)
void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages)
{
struct wb_writeback_args args = {
.sb = sb,
.sync_mode = WB_SYNC_NONE,
.nr_pages = nr_pages,
.range_cyclic = 1,
};
/*
* We treat @nr_pages=0 as the special case to do background writeback,
* ie. to sync pages until the background dirty threshold is reached.
*/
if (!nr_pages) {
args.nr_pages = LONG_MAX;
args.for_background = 1;
}
bdi_alloc_queue_work(bdi, &args);
}
/**
* bdi_start_background_writeback - start background writeback
* @bdi: the backing device to write from
*
* Description:
* This does WB_SYNC_NONE background writeback. The IO is only
* started when this function returns, we make no guarentees on
* completion. Caller need not hold sb s_umount semaphore.
*/
void bdi_start_background_writeback(struct backing_dev_info *bdi)
{
struct wb_writeback_args args = {
.sync_mode = WB_SYNC_NONE,
.nr_pages = LONG_MAX,
.for_background = 1,
.range_cyclic = 1,
};
bdi_alloc_queue_work(bdi, &args);
}