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authorChris Mason <chris.mason@oracle.com>2009-08-07 09:28:20 -0400
committerChris Mason <chris.mason@oracle.com>2009-09-11 13:31:04 -0400
commita97adc9fffb1707da4e97f91c801660c6be92aac (patch)
tree9385c1ada9d5b86b75cd00865bacc6bc39deaa9d
parent4f878e8475a465ddbd951e06a23317303f1b5b30 (diff)
downloadlinux-stericsson-a97adc9fffb1707da4e97f91c801660c6be92aac.tar.gz
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>
-rw-r--r--fs/btrfs/extent_io.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 7e5c5a0749e2..8d7a152a90c6 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2135,6 +2135,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
delalloc_end = 0;
page_started = 0;
if (!epd->extent_locked) {
+ u64 delalloc_to_write;
/*
* make sure the wbc mapping index is at least updated
* to this page.
@@ -2154,6 +2155,14 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
tree->ops->fill_delalloc(inode, page, delalloc_start,
delalloc_end, &page_started,
&nr_written);
+ delalloc_to_write = (delalloc_end -
+ max_t(u64, page_offset(page),
+ delalloc_start) + 1) >>
+ PAGE_CACHE_SHIFT;
+ if (wbc->nr_to_write < delalloc_to_write) {
+ wbc->nr_to_write = min_t(long, 8192,
+ delalloc_to_write);
+ }
delalloc_start = delalloc_end + 1;
}
@@ -2350,7 +2359,6 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
writepage_t writepage, void *data,
void (*flush_fn)(void *))
{
- struct backing_dev_info *bdi = mapping->backing_dev_info;
int ret = 0;
int done = 0;
struct pagevec pvec;
@@ -2425,10 +2433,6 @@ retry:
}
if (ret || wbc->nr_to_write <= 0)
done = 1;
- if (wbc->nonblocking && bdi_write_congested(bdi)) {
- wbc->encountered_congestion = 1;
- done = 1;
- }
}
pagevec_release(&pvec);
cond_resched();