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Commit 55eeaf05 authored by Qu Wenruo's avatar Qu Wenruo Committed by Chris Mason
Browse files

btrfs: qgroup: Introduce new functions to reserve/free metadata 



Introduce new functions btrfs_qgroup_reserve/free_meta() to reserve/free
metadata reserved space.

Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 297d750b

fs/btrfs/ctree.h

+3 −0
Original line number Diff line number Diff line
@@ -1943,6 +1943,9 @@ struct btrfs_root { 
	int send_in_progress;

	struct btrfs_subvolume_writers *subv_writers;

	atomic_t will_be_snapshoted;



	/* For qgroup metadata space reserve */

	atomic_t qgroup_meta_rsv;

};



struct btrfs_ioctl_defrag_range_args {

fs/btrfs/disk-io.c

+1 −0
Original line number Diff line number Diff line
@@ -1267,6 +1267,7 @@ static void __setup_root(u32 nodesize, u32 sectorsize, u32 stripesize, 
	atomic_set(&root->orphan_inodes, 0);

	atomic_set(&root->refs, 1);

	atomic_set(&root->will_be_snapshoted, 0);

	atomic_set(&root->qgroup_meta_rsv, 0);

	root->log_transid = 0;

	root->log_transid_committed = -1;

	root->last_log_commit = 0;

fs/btrfs/qgroup.c

+40 −0
Original line number Diff line number Diff line
@@ -2594,3 +2594,43 @@ int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len) 
{

	return __btrfs_qgroup_release_data(inode, start, len, 0);

}



int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes)

{

	int ret;



	if (!root->fs_info->quota_enabled || !is_fstree(root->objectid) ||

	    num_bytes == 0)

		return 0;



	BUG_ON(num_bytes != round_down(num_bytes, root->nodesize));

	ret = btrfs_qgroup_reserve(root, num_bytes);

	if (ret < 0)

		return ret;

	atomic_add(num_bytes, &root->qgroup_meta_rsv);

	return ret;

}



void btrfs_qgroup_free_meta_all(struct btrfs_root *root)

{

	int reserved;



	if (!root->fs_info->quota_enabled || !is_fstree(root->objectid))

		return;



	reserved = atomic_xchg(&root->qgroup_meta_rsv, 0);

	if (reserved == 0)

		return;

	btrfs_qgroup_free(root, reserved);

}



void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes)

{

	if (!root->fs_info->quota_enabled || !is_fstree(root->objectid))

		return;



	BUG_ON(num_bytes != round_down(num_bytes, root->nodesize));

	WARN_ON(atomic_read(&root->qgroup_meta_rsv) < num_bytes);

	atomic_sub(num_bytes, &root->qgroup_meta_rsv);

	btrfs_qgroup_free(root, num_bytes);

}

fs/btrfs/qgroup.h

+4 −0
Original line number Diff line number Diff line
@@ -101,4 +101,8 @@ int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid, 
int btrfs_qgroup_reserve_data(struct inode *inode, u64 start, u64 len);

int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len);

int btrfs_qgroup_free_data(struct inode *inode, u64 start, u64 len);



int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes);

void btrfs_qgroup_free_meta_all(struct btrfs_root *root);

void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes);

#endif /* __BTRFS_QGROUP__ */