From: Filipe Manana <fdmanana@suse.com>
Date: Thu, 13 Nov 2014 17:00:35 +0000 (+0000)
Subject: Btrfs: collect only the necessary ordered extents on ranged fsync
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0870295b2371673b3563735825ad559409d8cedc;p=linux-beck.git

Btrfs: collect only the necessary ordered extents on ranged fsync

Instead of collecting all ordered extents from the inode's ordered tree
and then wait for all of them to complete, just collect the ones that
overlap the fsync range.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 9c28eb4da4dd..534544e08f76 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -432,21 +432,31 @@ out:
 
 /* Needs to either be called under a log transaction or the log_mutex */
 void btrfs_get_logged_extents(struct inode *inode,
-			      struct list_head *logged_list)
+			      struct list_head *logged_list,
+			      const loff_t start,
+			      const loff_t end)
 {
 	struct btrfs_ordered_inode_tree *tree;
 	struct btrfs_ordered_extent *ordered;
 	struct rb_node *n;
+	struct rb_node *prev;
 
 	tree = &BTRFS_I(inode)->ordered_tree;
 	spin_lock_irq(&tree->lock);
-	for (n = rb_first(&tree->tree); n; n = rb_next(n)) {
+	n = __tree_search(&tree->tree, end, &prev);
+	if (!n)
+		n = prev;
+	for (; n; n = rb_prev(n)) {
 		ordered = rb_entry(n, struct btrfs_ordered_extent, rb_node);
+		if (ordered->file_offset > end)
+			continue;
+		if (entry_end(ordered) <= start)
+			break;
 		if (!list_empty(&ordered->log_list))
 			continue;
 		if (test_bit(BTRFS_ORDERED_LOGGED, &ordered->flags))
 			continue;
-		list_add_tail(&ordered->log_list, logged_list);
+		list_add(&ordered->log_list, logged_list);
 		atomic_inc(&ordered->refs);
 	}
 	spin_unlock_irq(&tree->lock);
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index 0124bffc775f..e96cd4ccd805 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -198,7 +198,9 @@ int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
 int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr);
 void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr);
 void btrfs_get_logged_extents(struct inode *inode,
-			      struct list_head *logged_list);
+			      struct list_head *logged_list,
+			      const loff_t start,
+			      const loff_t end);
 void btrfs_put_logged_extents(struct list_head *logged_list);
 void btrfs_submit_logged_extents(struct list_head *logged_list,
 				 struct btrfs_root *log);
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index afe483cb27b0..3883d0febd82 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3972,7 +3972,7 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
 
 	mutex_lock(&BTRFS_I(inode)->log_mutex);
 
-	btrfs_get_logged_extents(inode, &logged_list);
+	btrfs_get_logged_extents(inode, &logged_list, start, end);
 
 	/*
 	 * a brute force approach to making sure we get the most uptodate