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Commit 2f232036 authored by Jan Schmidt's avatar Jan Schmidt Committed by Josef Bacik
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Btrfs: rescan for qgroups 



If qgroup tracking is out of sync, a rescan operation can be started. It
iterates the complete extent tree and recalculates all qgroup tracking data.
This is an expensive operation and should not be used unless required.

A filesystem under rescan can still be umounted. The rescan continues on the
next mount.  Status information is provided with a separate ioctl while a
rescan operation is in progress.

Signed-off-by: default avatarJan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
parent 46b665ce

fs/btrfs/ctree.h

+11 −6
Original line number Diff line number Diff line
@@ -1021,9 +1021,9 @@ struct btrfs_block_group_item { 
 */

#define BTRFS_QGROUP_STATUS_FLAG_ON		(1ULL << 0)

/*

 * SCANNING is set during the initialization phase

 * RESCAN is set during the initialization phase

 */

#define BTRFS_QGROUP_STATUS_FLAG_SCANNING	(1ULL << 1)

#define BTRFS_QGROUP_STATUS_FLAG_RESCAN		(1ULL << 1)

/*

 * Some qgroup entries are known to be out of date,

 * either because the configuration has changed in a way that
@@ -1052,7 +1052,7 @@ struct btrfs_qgroup_status_item { 
	 * only used during scanning to record the progress

	 * of the scan. It contains a logical address

	 */

	__le64 scan;

	__le64 rescan;

} __attribute__ ((__packed__));



struct btrfs_qgroup_info_item {
@@ -1603,6 +1603,11 @@ struct btrfs_fs_info { 
	/* used by btrfs_qgroup_record_ref for an efficient tree traversal */

	u64 qgroup_seq;



	/* qgroup rescan items */

	struct mutex qgroup_rescan_lock; /* protects the progress item */

	struct btrfs_key qgroup_rescan_progress;

	struct btrfs_workers qgroup_rescan_workers;



	/* filesystem state */

	unsigned long fs_state;
@@ -2886,8 +2891,8 @@ BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item, 
		   version, 64);

BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,

		   flags, 64);

BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,

		   scan, 64);

BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,

		   rescan, 64);



/* btrfs_qgroup_info_item */

BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
@@ -3828,7 +3833,7 @@ int btrfs_quota_enable(struct btrfs_trans_handle *trans, 
		       struct btrfs_fs_info *fs_info);

int btrfs_quota_disable(struct btrfs_trans_handle *trans,

			struct btrfs_fs_info *fs_info);

int btrfs_quota_rescan(struct btrfs_fs_info *fs_info);

int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);

int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,

			      struct btrfs_fs_info *fs_info, u64 src, u64 dst);

int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,

fs/btrfs/disk-io.c

+5 −0
Original line number Diff line number Diff line
@@ -1976,6 +1976,7 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info) 
	btrfs_stop_workers(&fs_info->caching_workers);

	btrfs_stop_workers(&fs_info->readahead_workers);

	btrfs_stop_workers(&fs_info->flush_workers);

	btrfs_stop_workers(&fs_info->qgroup_rescan_workers);

}



/* helper to cleanup tree roots */
@@ -2267,6 +2268,7 @@ int open_ctree(struct super_block *sb, 
	fs_info->qgroup_seq = 1;

	fs_info->quota_enabled = 0;

	fs_info->pending_quota_state = 0;

	mutex_init(&fs_info->qgroup_rescan_lock);



	btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);

	btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
@@ -2476,6 +2478,8 @@ int open_ctree(struct super_block *sb, 
	btrfs_init_workers(&fs_info->readahead_workers, "readahead",

			   fs_info->thread_pool_size,

			   &fs_info->generic_worker);

	btrfs_init_workers(&fs_info->qgroup_rescan_workers, "qgroup-rescan", 1,

			   &fs_info->generic_worker);



	/*

	 * endios are largely parallel and should have a very
@@ -2510,6 +2514,7 @@ int open_ctree(struct super_block *sb, 
	ret |= btrfs_start_workers(&fs_info->caching_workers);

	ret |= btrfs_start_workers(&fs_info->readahead_workers);

	ret |= btrfs_start_workers(&fs_info->flush_workers);

	ret |= btrfs_start_workers(&fs_info->qgroup_rescan_workers);

	if (ret) {

		err = -ENOMEM;

		goto fail_sb_buffer;

fs/btrfs/ioctl.c

+69 −14
Original line number Diff line number Diff line
@@ -3701,13 +3701,11 @@ static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 
	}



	down_write(&root->fs_info->subvol_sem);

	if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {

	trans = btrfs_start_transaction(root->fs_info->tree_root, 2);

	if (IS_ERR(trans)) {

		ret = PTR_ERR(trans);

		goto out;

	}

	}



	switch (sa->cmd) {

	case BTRFS_QUOTA_CTL_ENABLE:
@@ -3716,9 +3714,6 @@ static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 
	case BTRFS_QUOTA_CTL_DISABLE:

		ret = btrfs_quota_disable(trans, root->fs_info);

		break;

	case BTRFS_QUOTA_CTL_RESCAN:

		ret = btrfs_quota_rescan(root->fs_info);

		break;

	default:

		ret = -EINVAL;

		break;
@@ -3727,11 +3722,9 @@ static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 
	if (copy_to_user(arg, sa, sizeof(*sa)))

		ret = -EFAULT;



	if (trans) {

	err = btrfs_commit_transaction(trans, root->fs_info->tree_root);

	if (err && !ret)

		ret = err;

	}

out:

	kfree(sa);

	up_write(&root->fs_info->subvol_sem);
@@ -3886,6 +3879,64 @@ static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 
	return ret;

}



static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)

{

	struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;

	struct btrfs_ioctl_quota_rescan_args *qsa;

	int ret;



	if (!capable(CAP_SYS_ADMIN))

		return -EPERM;



	ret = mnt_want_write_file(file);

	if (ret)

		return ret;



	qsa = memdup_user(arg, sizeof(*qsa));

	if (IS_ERR(qsa)) {

		ret = PTR_ERR(qsa);

		goto drop_write;

	}



	if (qsa->flags) {

		ret = -EINVAL;

		goto out;

	}



	ret = btrfs_qgroup_rescan(root->fs_info);



out:

	kfree(qsa);

drop_write:

	mnt_drop_write_file(file);

	return ret;

}



static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)

{

	struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;

	struct btrfs_ioctl_quota_rescan_args *qsa;

	int ret = 0;



	if (!capable(CAP_SYS_ADMIN))

		return -EPERM;



	qsa = kzalloc(sizeof(*qsa), GFP_NOFS);

	if (!qsa)

		return -ENOMEM;



	if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {

		qsa->flags = 1;

		qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;

	}



	if (copy_to_user(arg, qsa, sizeof(*qsa)))

		ret = -EFAULT;



	kfree(qsa);

	return ret;

}



static long btrfs_ioctl_set_received_subvol(struct file *file,

					    void __user *arg)

{
@@ -4124,6 +4175,10 @@ long btrfs_ioctl(struct file *file, unsigned int 
		return btrfs_ioctl_qgroup_create(file, argp);

	case BTRFS_IOC_QGROUP_LIMIT:

		return btrfs_ioctl_qgroup_limit(file, argp);

	case BTRFS_IOC_QUOTA_RESCAN:

		return btrfs_ioctl_quota_rescan(file, argp);

	case BTRFS_IOC_QUOTA_RESCAN_STATUS:

		return btrfs_ioctl_quota_rescan_status(file, argp);

	case BTRFS_IOC_DEV_REPLACE:

		return btrfs_ioctl_dev_replace(root, argp);

	case BTRFS_IOC_GET_FSLABEL:

fs/btrfs/qgroup.c

+304 −14
Original line number Diff line number Diff line
@@ -31,13 +31,13 @@ 
#include "locking.h"

#include "ulist.h"

#include "backref.h"

#include "extent_io.h"



/* TODO XXX FIXME

 *  - subvol delete -> delete when ref goes to 0? delete limits also?

 *  - reorganize keys

 *  - compressed

 *  - sync

 *  - rescan

 *  - copy also limits on subvol creation

 *  - limit

 *  - caches fuer ulists
@@ -98,6 +98,14 @@ struct btrfs_qgroup_list { 
	struct btrfs_qgroup *member;

};



struct qgroup_rescan {

	struct btrfs_work	work;

	struct btrfs_fs_info	*fs_info;

};



static void qgroup_rescan_start(struct btrfs_fs_info *fs_info,

				struct qgroup_rescan *qscan);



/* must be called with qgroup_ioctl_lock held */

static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,

					   u64 qgroupid)
@@ -298,7 +306,20 @@ int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info) 
			}

			fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,

									  ptr);

			/* FIXME read scan element */

			fs_info->qgroup_rescan_progress.objectid =

					btrfs_qgroup_status_rescan(l, ptr);

			if (fs_info->qgroup_flags &

			    BTRFS_QGROUP_STATUS_FLAG_RESCAN) {

				struct qgroup_rescan *qscan =

					kmalloc(sizeof(*qscan), GFP_NOFS);

				if (!qscan) {

					ret = -ENOMEM;

					goto out;

				}

				fs_info->qgroup_rescan_progress.type = 0;

				fs_info->qgroup_rescan_progress.offset = 0;

				qgroup_rescan_start(fs_info, qscan);

			}

			goto next1;

		}
@@ -719,7 +740,8 @@ static int update_qgroup_status_item(struct btrfs_trans_handle *trans, 
	ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);

	btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);

	btrfs_set_qgroup_status_generation(l, ptr, trans->transid);

	/* XXX scan */

	btrfs_set_qgroup_status_rescan(l, ptr,

				fs_info->qgroup_rescan_progress.objectid);



	btrfs_mark_buffer_dirty(l);
@@ -830,7 +852,7 @@ int btrfs_quota_enable(struct btrfs_trans_handle *trans, 
	fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |

				BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;

	btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);

	btrfs_set_qgroup_status_scan(leaf, ptr, 0);

	btrfs_set_qgroup_status_rescan(leaf, ptr, 0);



	btrfs_mark_buffer_dirty(leaf);
@@ -944,10 +966,11 @@ int btrfs_quota_disable(struct btrfs_trans_handle *trans, 
	return ret;

}



int btrfs_quota_rescan(struct btrfs_fs_info *fs_info)

static void qgroup_dirty(struct btrfs_fs_info *fs_info,

			 struct btrfs_qgroup *qgroup)

{

	/* FIXME */

	return 0;

	if (list_empty(&qgroup->dirty))

		list_add(&qgroup->dirty, &fs_info->dirty_qgroups);

}



int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
@@ -1155,13 +1178,6 @@ int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, 
	return ret;

}



static void qgroup_dirty(struct btrfs_fs_info *fs_info,

			 struct btrfs_qgroup *qgroup)

{

	if (list_empty(&qgroup->dirty))

		list_add(&qgroup->dirty, &fs_info->dirty_qgroups);

}



/*

 * btrfs_qgroup_record_ref is called when the ref is added or deleted. it puts

 * the modification into a list that's later used by btrfs_end_transaction to
@@ -1390,6 +1406,15 @@ int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans, 
		BUG();

	}



	mutex_lock(&fs_info->qgroup_rescan_lock);

	if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {

		if (fs_info->qgroup_rescan_progress.objectid <= node->bytenr) {

			mutex_unlock(&fs_info->qgroup_rescan_lock);

			return 0;

		}

	}

	mutex_unlock(&fs_info->qgroup_rescan_lock);



	/*

	 * the delayed ref sequence number we pass depends on the direction of

	 * the operation. for add operations, we pass
@@ -1403,7 +1428,15 @@ int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans, 
	if (ret < 0)

		return ret;



	mutex_lock(&fs_info->qgroup_rescan_lock);

	spin_lock(&fs_info->qgroup_lock);

	if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {

		if (fs_info->qgroup_rescan_progress.objectid <= node->bytenr) {

			ret = 0;

			goto unlock;

		}

	}



	quota_root = fs_info->quota_root;

	if (!quota_root)

		goto unlock;
@@ -1445,6 +1478,7 @@ int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans, 


unlock:

	spin_unlock(&fs_info->qgroup_lock);

	mutex_unlock(&fs_info->qgroup_rescan_lock);

	ulist_free(roots);

	ulist_free(tmp);
@@ -1823,3 +1857,259 @@ void assert_qgroups_uptodate(struct btrfs_trans_handle *trans) 
		(u32)trans->delayed_ref_elem.seq);

	BUG();

}



/*

 * returns < 0 on error, 0 when more leafs are to be scanned.

 * returns 1 when done, 2 when done and FLAG_INCONSISTENT was cleared.

 */

static int

qgroup_rescan_leaf(struct qgroup_rescan *qscan, struct btrfs_path *path,

		   struct btrfs_trans_handle *trans, struct ulist *tmp,

		   struct extent_buffer *scratch_leaf)

{

	struct btrfs_key found;

	struct btrfs_fs_info *fs_info = qscan->fs_info;

	struct ulist *roots = NULL;

	struct ulist_node *unode;

	struct ulist_iterator uiter;

	struct seq_list tree_mod_seq_elem = {};

	u64 seq;

	int slot;

	int ret;



	path->leave_spinning = 1;

	mutex_lock(&fs_info->qgroup_rescan_lock);

	ret = btrfs_search_slot_for_read(fs_info->extent_root,

					 &fs_info->qgroup_rescan_progress,

					 path, 1, 0);



	pr_debug("current progress key (%llu %u %llu), search_slot ret %d\n",

		 (unsigned long long)fs_info->qgroup_rescan_progress.objectid,

		 fs_info->qgroup_rescan_progress.type,

		 (unsigned long long)fs_info->qgroup_rescan_progress.offset,

		 ret);



	if (ret) {

		/*

		 * The rescan is about to end, we will not be scanning any

		 * further blocks. We cannot unset the RESCAN flag here, because

		 * we want to commit the transaction if everything went well.

		 * To make the live accounting work in this phase, we set our

		 * scan progress pointer such that every real extent objectid

		 * will be smaller.

		 */

		fs_info->qgroup_rescan_progress.objectid = (u64)-1;

		btrfs_release_path(path);

		mutex_unlock(&fs_info->qgroup_rescan_lock);

		return ret;

	}



	btrfs_item_key_to_cpu(path->nodes[0], &found,

			      btrfs_header_nritems(path->nodes[0]) - 1);

	fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;



	btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem);

	memcpy(scratch_leaf, path->nodes[0], sizeof(*scratch_leaf));

	slot = path->slots[0];

	btrfs_release_path(path);

	mutex_unlock(&fs_info->qgroup_rescan_lock);



	for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {

		btrfs_item_key_to_cpu(scratch_leaf, &found, slot);

		if (found.type != BTRFS_EXTENT_ITEM_KEY)

			continue;

		ret = btrfs_find_all_roots(trans, fs_info, found.objectid,

					   tree_mod_seq_elem.seq, &roots);

		if (ret < 0)

			goto out;

		spin_lock(&fs_info->qgroup_lock);

		seq = fs_info->qgroup_seq;

		fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */



		ret = qgroup_account_ref_step1(fs_info, roots, tmp, seq);

		if (ret) {

			spin_unlock(&fs_info->qgroup_lock);

			ulist_free(roots);

			goto out;

		}



		/*

		 * step2 of btrfs_qgroup_account_ref works from a single root,

		 * we're doing all at once here.

		 */

		ulist_reinit(tmp);

		ULIST_ITER_INIT(&uiter);

		while ((unode = ulist_next(roots, &uiter))) {

			struct btrfs_qgroup *qg;



			qg = find_qgroup_rb(fs_info, unode->val);

			if (!qg)

				continue;



			ret = ulist_add(tmp, qg->qgroupid, (uintptr_t)qg,

					GFP_ATOMIC);

			if (ret < 0) {

				spin_unlock(&fs_info->qgroup_lock);

				ulist_free(roots);

				goto out;

			}

		}



		/* this loop is similar to step 2 of btrfs_qgroup_account_ref */

		ULIST_ITER_INIT(&uiter);

		while ((unode = ulist_next(tmp, &uiter))) {

			struct btrfs_qgroup *qg;

			struct btrfs_qgroup_list *glist;



			qg = (struct btrfs_qgroup *)(uintptr_t) unode->aux;

			qg->rfer += found.offset;

			qg->rfer_cmpr += found.offset;

			WARN_ON(qg->tag >= seq);

			if (qg->refcnt - seq == roots->nnodes) {

				qg->excl += found.offset;

				qg->excl_cmpr += found.offset;

			}

			qgroup_dirty(fs_info, qg);



			list_for_each_entry(glist, &qg->groups, next_group) {

				ret = ulist_add(tmp, glist->group->qgroupid,

						(uintptr_t)glist->group,

						GFP_ATOMIC);

				if (ret < 0) {

					spin_unlock(&fs_info->qgroup_lock);

					ulist_free(roots);

					goto out;

				}

			}

		}



		spin_unlock(&fs_info->qgroup_lock);

		ulist_free(roots);

		ret = 0;

	}



out:

	btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);



	return ret;

}



static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)

{

	struct qgroup_rescan *qscan = container_of(work, struct qgroup_rescan,

						   work);

	struct btrfs_path *path;

	struct btrfs_trans_handle *trans = NULL;

	struct btrfs_fs_info *fs_info = qscan->fs_info;

	struct ulist *tmp = NULL;

	struct extent_buffer *scratch_leaf = NULL;

	int err = -ENOMEM;



	path = btrfs_alloc_path();

	if (!path)

		goto out;

	tmp = ulist_alloc(GFP_NOFS);

	if (!tmp)

		goto out;

	scratch_leaf = kmalloc(sizeof(*scratch_leaf), GFP_NOFS);

	if (!scratch_leaf)

		goto out;



	err = 0;

	while (!err) {

		trans = btrfs_start_transaction(fs_info->fs_root, 0);

		if (IS_ERR(trans)) {

			err = PTR_ERR(trans);

			break;

		}

		if (!fs_info->quota_enabled) {

			err = -EINTR;

		} else {

			err = qgroup_rescan_leaf(qscan, path, trans,

						 tmp, scratch_leaf);

		}

		if (err > 0)

			btrfs_commit_transaction(trans, fs_info->fs_root);

		else

			btrfs_end_transaction(trans, fs_info->fs_root);

	}



out:

	kfree(scratch_leaf);

	ulist_free(tmp);

	btrfs_free_path(path);

	kfree(qscan);



	mutex_lock(&fs_info->qgroup_rescan_lock);

	fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;



	if (err == 2 &&

	    fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {

		fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;

	} else if (err < 0) {

		fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;

	}

	mutex_unlock(&fs_info->qgroup_rescan_lock);



	if (err >= 0) {

		pr_info("btrfs: qgroup scan completed%s\n",

			err == 2 ? " (inconsistency flag cleared)" : "");

	} else {

		pr_err("btrfs: qgroup scan failed with %d\n", err);

	}

}



static void

qgroup_rescan_start(struct btrfs_fs_info *fs_info, struct qgroup_rescan *qscan)

{

	memset(&qscan->work, 0, sizeof(qscan->work));

	qscan->work.func = btrfs_qgroup_rescan_worker;

	qscan->fs_info = fs_info;



	pr_info("btrfs: qgroup scan started\n");

	btrfs_queue_worker(&fs_info->qgroup_rescan_workers, &qscan->work);

}



int

btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)

{

	int ret = 0;

	struct rb_node *n;

	struct btrfs_qgroup *qgroup;

	struct qgroup_rescan *qscan = kmalloc(sizeof(*qscan), GFP_NOFS);



	if (!qscan)

		return -ENOMEM;



	mutex_lock(&fs_info->qgroup_rescan_lock);

	spin_lock(&fs_info->qgroup_lock);

	if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)

		ret = -EINPROGRESS;

	else if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))

		ret = -EINVAL;

	if (ret) {

		spin_unlock(&fs_info->qgroup_lock);

		mutex_unlock(&fs_info->qgroup_rescan_lock);

		kfree(qscan);

		return ret;

	}



	fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;

	memset(&fs_info->qgroup_rescan_progress, 0,

		sizeof(fs_info->qgroup_rescan_progress));



	/* clear all current qgroup tracking information */

	for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {

		qgroup = rb_entry(n, struct btrfs_qgroup, node);

		qgroup->rfer = 0;

		qgroup->rfer_cmpr = 0;

		qgroup->excl = 0;

		qgroup->excl_cmpr = 0;

	}

	spin_unlock(&fs_info->qgroup_lock);

	mutex_unlock(&fs_info->qgroup_rescan_lock);



	qgroup_rescan_start(fs_info, qscan);



	return 0;

}

include/uapi/linux/btrfs.h

+11 −1
Original line number Diff line number Diff line
@@ -376,12 +376,18 @@ struct btrfs_ioctl_get_dev_stats { 


#define BTRFS_QUOTA_CTL_ENABLE	1

#define BTRFS_QUOTA_CTL_DISABLE	2

#define BTRFS_QUOTA_CTL_RESCAN	3

#define BTRFS_QUOTA_CTL_RESCAN__NOTUSED	3

struct btrfs_ioctl_quota_ctl_args {

	__u64 cmd;

	__u64 status;

};



struct btrfs_ioctl_quota_rescan_args {

	__u64	flags;

	__u64   progress;

	__u64   reserved[6];

};



struct btrfs_ioctl_qgroup_assign_args {

	__u64 assign;

	__u64 src;
@@ -520,6 +526,10 @@ struct btrfs_ioctl_send_args { 
			       struct btrfs_ioctl_qgroup_create_args)

#define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \

			       struct btrfs_ioctl_qgroup_limit_args)

#define BTRFS_IOC_QUOTA_RESCAN _IOW(BTRFS_IOCTL_MAGIC, 44, \

			       struct btrfs_ioctl_quota_rescan_args)

#define BTRFS_IOC_QUOTA_RESCAN_STATUS _IOR(BTRFS_IOCTL_MAGIC, 45, \

			       struct btrfs_ioctl_quota_rescan_args)

#define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \

				   char[BTRFS_LABEL_SIZE])

#define BTRFS_IOC_SET_FSLABEL _IOW(BTRFS_IOCTL_MAGIC, 50, \