From 4529ba495c6fd0d79247784d0df55ae6512fa883 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Thu, 31 Jan 2008 16:45:07 -0500
Subject: [PATCH] Btrfs: Add data block hints to SSD mode too

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---
 fs/btrfs/ctree.h       |  1 +
 fs/btrfs/disk-io.c     |  1 +
 fs/btrfs/extent-tree.c | 28 ++++++++++++++++------------
 fs/btrfs/transaction.c |  1 +
 4 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8f93e066bf8b..35e9a7af10a5 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -354,6 +354,7 @@ struct btrfs_fs_info {
 	spinlock_t new_trans_lock;
 	u64 delalloc_bytes;
 	u64 last_alloc;
+	u64 last_data_alloc;
 };
 /*
  * in ram representation of the tree.  extent_root is used for all allocations
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ad72e2192015..dda8ad6c0077 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -688,6 +688,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
 	fs_info->closing = 0;
 	fs_info->total_pinned = 0;
 	fs_info->last_alloc = 0;
+	fs_info->last_data_alloc = 0;
 
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 	INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 90718f77bbc0..fa54ea590078 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1410,6 +1410,7 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
 	int ret;
 	int slot = 0;
 	u64 last_byte = 0;
+	u64 *last_ptr = NULL;
 	u64 orig_search_start = search_start;
 	int start_found;
 	struct extent_buffer *l;
@@ -1433,14 +1434,17 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
 
 	/* for SSD, cluster allocations together as much as possible */
 	if (btrfs_test_opt(root, SSD)) {
-		if (!data) {
-			if (root->fs_info->last_alloc)
-				hint_byte = root->fs_info->last_alloc;
-			else {
-				hint_byte = hint_byte &
-					~((u64)BTRFS_BLOCK_GROUP_SIZE - 1);
-				empty_size += 16 * 1024 * 1024;
-			}
+		if (data)
+			last_ptr = &root->fs_info->last_data_alloc;
+		else
+			last_ptr = &root->fs_info->last_alloc;
+		if (*last_ptr) {
+			hint_byte = *last_ptr;
+		}
+		else {
+			hint_byte = hint_byte &
+				~((u64)BTRFS_BLOCK_GROUP_SIZE - 1);
+			empty_size += 16 * 1024 * 1024;
 		}
 	}
 
@@ -1470,8 +1474,8 @@ check_failed:
 	search_start = find_search_start(root, &block_group, search_start,
 					 total_needed, data);
 
-	if (!data && btrfs_test_opt(root, SSD) && info->last_alloc &&
-	    search_start != info->last_alloc) {
+	if (btrfs_test_opt(root, SSD) && *last_ptr &&
+	    search_start != *last_ptr) {
 		info->last_alloc = 0;
 		if (!empty_size) {
 			empty_size += 16 * 1024 * 1024;
@@ -1609,6 +1613,8 @@ check_pending:
 	}
 	ins->offset = num_bytes;
 	btrfs_free_path(path);
+	if (btrfs_test_opt(root, SSD))
+		*last_ptr = ins->objectid + ins->offset;
 	return 0;
 
 new_group:
@@ -1636,8 +1642,6 @@ enospc:
 error:
 	btrfs_release_path(root, path);
 	btrfs_free_path(path);
-	if (btrfs_test_opt(root, SSD) && !ret && !data)
-		info->last_alloc = ins->objectid + ins->offset;
 	return ret;
 }
 /*
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index b4a1bc62a784..3f64d0c7ddb9 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -58,6 +58,7 @@ static int join_transaction(struct btrfs_root *root)
 		root->fs_info->generation++;
 		root->fs_info->running_transaction = cur_trans;
 		root->fs_info->last_alloc = 0;
+		root->fs_info->last_data_alloc = 0;
 		cur_trans->num_writers = 1;
 		cur_trans->num_joined = 0;
 		cur_trans->transid = root->fs_info->generation;