ocfs2: fix write() performance regression

On file systems which don't support sparse files, Ocfs2_map_page_blocks()
was reading blocks on appending writes. This caused write performance to
suffer dramatically. Fix this by detecting an appending write on a nonsparse
fs and skipping the read.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index c69c1b3..556e34c 100644 (file)
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -729,6 +729,27 @@ static void ocfs2_clear_page_regions(struct page *page,
 }
 
 /*
+ * Nonsparse file systems fully allocate before we get to the write
+ * code. This prevents ocfs2_write() from tagging the write as an
+ * allocating one, which means ocfs2_map_page_blocks() might try to
+ * read-in the blocks at the tail of our file. Avoid reading them by
+ * testing i_size against each block offset.
+ */
+static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
+                                unsigned int block_start)
+{
+       u64 offset = page_offset(page) + block_start;
+
+       if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
+               return 1;
+
+       if (i_size_read(inode) > offset)
+               return 1;
+
+       return 0;
+}
+
+/*
  * Some of this taken from block_prepare_write(). We already have our
  * mapping by now though, and the entire write will be allocating or
  * it won't, so not much need to use BH_New.
@@ -781,6 +802,7 @@ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
                                set_buffer_uptodate(bh);
                } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
                           !buffer_new(bh) &&
+                          ocfs2_should_read_blk(inode, page, block_start) &&
                           (block_start < from || block_end > to)) {
                        ll_rw_block(READ, 1, &bh);
                        *wait_bh++=bh;