Btrfs: don't call writepages from within write_full_page

When doing a writepage we call writepages to try and write out any other dirty
pages in the area.  This could cause problems where we commit a transaction and
then have somebody else dirtying metadata in the area as we could end up writing
out a lot more than we care about, which could cause latency on anybody who is
waiting for the transaction to completely finish committing.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a59ebc6..8491712 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2502,7 +2502,6 @@ int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
                          struct writeback_control *wbc)
 {
        int ret;
-       struct address_space *mapping = page->mapping;
        struct extent_page_data epd = {
                .bio = NULL,
                .tree = tree,
@@ -2510,18 +2509,9 @@ int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
                .extent_locked = 0,
                .sync_io = wbc->sync_mode == WB_SYNC_ALL,
        };
-       struct writeback_control wbc_writepages = {
-               .sync_mode      = wbc->sync_mode,
-               .older_than_this = NULL,
-               .nr_to_write    = 64,
-               .range_start    = page_offset(page) + PAGE_CACHE_SIZE,
-               .range_end      = (loff_t)-1,
-       };
 
        ret = __extent_writepage(page, wbc, &epd);
 
-       extent_write_cache_pages(tree, mapping, &wbc_writepages,
-                                __extent_writepage, &epd, flush_write_bio);
        flush_epd_write_bio(&epd);
        return ret;
 }