[PATCH 11/20] btrfs: move hint_byte into find_free_extent_ctl

From: Naohiro Aota <naohiro.aota@wdc.com>
To: linux-btrfs@vger.kernel.org, David Sterba <dsterba@suse.com>
Cc: Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>,
	Nikolay Borisov <nborisov@suse.com>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Johannes Thumshirn <Johannes.Thumshirn@wdc.com>,
	Hannes Reinecke <hare@suse.com>,
	Anand Jain <anand.jain@oracle.com>,
	linux-fsdevel@vger.kernel.org,
	Naohiro Aota <naohiro.aota@wdc.com>
Subject: [PATCH 11/20] btrfs: move hint_byte into find_free_extent_ctl
Date: Thu,  6 Feb 2020 19:42:05 +0900	[thread overview]
Message-ID: <20200206104214.400857-12-naohiro.aota@wdc.com> (raw)
In-Reply-To: <20200206104214.400857-1-naohiro.aota@wdc.com>

This commit moves hint_byte into find_free_extent_ctl, so that we can
modify the hint_byte in the other functions. This will help us split
find_free_extent further. This commit also renames the function argument
"hint_byte" to "hint_byte_orig" to avoid misuse.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
 fs/btrfs/extent-tree.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 247d68eb4735..b1f52eee24fe 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3494,6 +3494,9 @@ struct find_free_extent_ctl {
 	/* Found result */
 	u64 found_offset;
 
+	/* Hint byte to start looking for an empty space */
+	u64 hint_byte;
+
 	/* Allocation policy */
 	enum btrfs_extent_allocation_policy policy;
 };
@@ -3808,7 +3811,7 @@ static int find_free_extent_update_loop(struct btrfs_fs_info *fs_info,
  */
 static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
 				u64 ram_bytes, u64 num_bytes, u64 empty_size,
-				u64 hint_byte, struct btrfs_key *ins,
+				u64 hint_byte_orig, struct btrfs_key *ins,
 				u64 flags, int delalloc)
 {
 	int ret = 0;
@@ -3833,6 +3836,7 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
 	ffe_ctl.have_caching_bg = false;
 	ffe_ctl.orig_have_caching_bg = false;
 	ffe_ctl.found_offset = 0;
+	ffe_ctl.hint_byte = hint_byte_orig;
 	ffe_ctl.policy = BTRFS_EXTENT_ALLOC_CLUSTERED;
 
 	ins->type = BTRFS_EXTENT_ITEM_KEY;
@@ -3875,14 +3879,14 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
 	if (last_ptr) {
 		spin_lock(&last_ptr->lock);
 		if (last_ptr->block_group)
-			hint_byte = last_ptr->window_start;
+			ffe_ctl.hint_byte = last_ptr->window_start;
 		if (last_ptr->fragmented) {
 			/*
 			 * We still set window_start so we can keep track of the
 			 * last place we found an allocation to try and save
 			 * some time.
 			 */
-			hint_byte = last_ptr->window_start;
+			ffe_ctl.hint_byte = last_ptr->window_start;
 			use_cluster = false;
 		}
 		spin_unlock(&last_ptr->lock);
@@ -3890,8 +3894,8 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
 
 	ffe_ctl.search_start = max(ffe_ctl.search_start,
 				   first_logical_byte(fs_info, 0));
-	ffe_ctl.search_start = max(ffe_ctl.search_start, hint_byte);
-	if (ffe_ctl.search_start == hint_byte) {
+	ffe_ctl.search_start = max(ffe_ctl.search_start, ffe_ctl.hint_byte);
+	if (ffe_ctl.search_start == ffe_ctl.hint_byte) {
 		block_group = btrfs_lookup_block_group(fs_info,
 						       ffe_ctl.search_start);
 		/*
-- 
2.25.0

