Commit 31f3d255 authored by Miao Xie's avatar Miao Xie Committed by Josef Bacik
Browse files

Btrfs: split the global ordered extents mutex 



When we create a snapshot, we just need wait the ordered extents in
the source fs/file root, but because we use the global mutex to protect
this ordered extents list of the source fs/file root to avoid accessing
a empty list, if someone got the mutex to access the ordered extents list
of the other fs/file root, we had to wait.

This patch splits the above global mutex, now every fs/file root has
its own mutex to protect its own list.

Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
parent 6c255e67

fs/btrfs/ctree.h

+2 −0
Original line number Diff line number Diff line
@@ -1814,6 +1814,8 @@ struct btrfs_root { 
	struct list_head delalloc_inodes;

	struct list_head delalloc_root;

	u64 nr_delalloc_inodes;



	struct mutex ordered_extent_mutex;

	/*

	 * this is used by the balancing code to wait for all the pending

	 * ordered extents

fs/btrfs/disk-io.c

+1 −0
Original line number Diff line number Diff line
@@ -1220,6 +1220,7 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 
	spin_lock_init(&root->log_extents_lock[1]);

	mutex_init(&root->objectid_mutex);

	mutex_init(&root->log_mutex);

	mutex_init(&root->ordered_extent_mutex);

	init_waitqueue_head(&root->log_writer_wait);

	init_waitqueue_head(&root->log_commit_wait[0]);

	init_waitqueue_head(&root->log_commit_wait[1]);

fs/btrfs/ordered-data.c

+4 −13
Original line number Diff line number Diff line
@@ -595,7 +595,7 @@ static void btrfs_run_ordered_extent_work(struct btrfs_work *work) 
 * wait for all the ordered extents in a root.  This is done when balancing

 * space between drives.

 */

static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr)

int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr)

{

	struct list_head splice, works;

	struct btrfs_ordered_extent *ordered, *next;
@@ -604,6 +604,7 @@ static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) 
	INIT_LIST_HEAD(&splice);

	INIT_LIST_HEAD(&works);



	mutex_lock(&root->ordered_extent_mutex);

	spin_lock(&root->ordered_extent_lock);

	list_splice_init(&root->ordered_extents, &splice);

	while (!list_empty(&splice) && nr) {
@@ -635,17 +636,7 @@ static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) 
		btrfs_put_ordered_extent(ordered);

		cond_resched();

	}



	return count;

}



int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr)

{

	int count;



	mutex_lock(&root->fs_info->ordered_operations_mutex);

	count = __btrfs_wait_ordered_extents(root, nr);

	mutex_unlock(&root->fs_info->ordered_operations_mutex);

	mutex_unlock(&root->ordered_extent_mutex);



	return count;

}
@@ -670,7 +661,7 @@ void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr) 
			       &fs_info->ordered_roots);

		spin_unlock(&fs_info->ordered_root_lock);



		done = __btrfs_wait_ordered_extents(root, nr);

		done = btrfs_wait_ordered_extents(root, nr);

		btrfs_put_fs_root(root);



		spin_lock(&fs_info->ordered_root_lock);

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