ext4: optimize ext4_bio_write_page() when no extent conversion is needed

[karo-tx-linux.git] / fs / ext4 / page-io.c

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 68d92a8f71d730a42a923b078c586f74e30ce829..0cfd03e19d7d221d346399f0f975ba59189eab72 100644 (file)
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -259,6 +259,11 @@ static void ext4_end_bio(struct bio *bio, int error)
                             bi_sector >> (inode->i_blkbits - 9));
        }
 
+       if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
+               ext4_free_io_end(io_end);
+               return;
+       }
+
        /* Add the io_end to per-inode completed io list*/
        spin_lock_irqsave(&EXT4_I(inode)->i_completed_io_lock, flags);
        list_add_tail(&io_end->list, &EXT4_I(inode)->i_completed_io_list);
@@ -381,8 +386,6 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
 
        BUG_ON(!PageLocked(page));
        BUG_ON(PageWriteback(page));
-       set_page_writeback(page);
-       ClearPageError(page);
 
        io_page = kmem_cache_alloc(io_page_cachep, GFP_NOFS);
        if (!io_page) {
@@ -393,6 +396,8 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
        io_page->p_page = page;
        atomic_set(&io_page->p_count, 1);
        get_page(page);
+       set_page_writeback(page);
+       ClearPageError(page);
 
        for (bh = head = page_buffers(page), block_start = 0;
             bh != head || !block_start;