forked from luck/tmp_suning_uos_patched
Btrfs: use larger nr_to_write for larger extents
When btrfs fills a large delayed allocation extent, it is a good idea to try and convince the write_cache_pages caller to go ahead and write a good chunk of that extent. The extra IO is basically free because we know it is contiguous. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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4f878e8475
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@ -2135,6 +2135,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
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delalloc_end = 0;
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page_started = 0;
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if (!epd->extent_locked) {
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u64 delalloc_to_write;
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/*
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* make sure the wbc mapping index is at least updated
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* to this page.
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@ -2154,6 +2155,14 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
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tree->ops->fill_delalloc(inode, page, delalloc_start,
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delalloc_end, &page_started,
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&nr_written);
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delalloc_to_write = (delalloc_end -
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max_t(u64, page_offset(page),
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delalloc_start) + 1) >>
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PAGE_CACHE_SHIFT;
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if (wbc->nr_to_write < delalloc_to_write) {
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wbc->nr_to_write = min_t(long, 8192,
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delalloc_to_write);
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}
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delalloc_start = delalloc_end + 1;
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}
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@ -2350,7 +2359,6 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
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writepage_t writepage, void *data,
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void (*flush_fn)(void *))
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{
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struct backing_dev_info *bdi = mapping->backing_dev_info;
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int ret = 0;
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int done = 0;
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struct pagevec pvec;
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@ -2425,10 +2433,6 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
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}
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if (ret || wbc->nr_to_write <= 0)
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done = 1;
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if (wbc->nonblocking && bdi_write_congested(bdi)) {
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wbc->encountered_congestion = 1;
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done = 1;
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}
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}
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pagevec_release(&pvec);
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cond_resched();
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