Commit 6f72c7e2 authored by Arne Jansen's avatar Arne Jansen Committed by Jan Schmidt
Browse files

Btrfs: add qgroup inheritance 



When creating a subvolume or snapshot, it is necessary
to initialize the qgroup account with a copy of some
other (tracking) qgroup. This patch adds parameters
to the ioctls to pass the information from which qgroup
to inherit.

Signed-off-by: default avatarArne Jansen <sensille@gmx.net>
parent 5d13a37b

fs/btrfs/ioctl.c

+42 −17
Original line number Diff line number Diff line
@@ -336,7 +336,8 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 
static noinline int create_subvol(struct btrfs_root *root,

				  struct dentry *dentry,

				  char *name, int namelen,

				  u64 *async_transid)

				  u64 *async_transid,

				  struct btrfs_qgroup_inherit **inherit)

{

	struct btrfs_trans_handle *trans;

	struct btrfs_key key;
@@ -368,6 +369,11 @@ static noinline int create_subvol(struct btrfs_root *root, 
	if (IS_ERR(trans))

		return PTR_ERR(trans);



	ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid,

				   inherit ? *inherit : NULL);

	if (ret)

		goto fail;



	leaf = btrfs_alloc_free_block(trans, root, root->leafsize,

				      0, objectid, NULL, 0, 0, 0);

	if (IS_ERR(leaf)) {
@@ -484,7 +490,7 @@ static noinline int create_subvol(struct btrfs_root *root, 


static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,

			   char *name, int namelen, u64 *async_transid,

			   bool readonly)

			   bool readonly, struct btrfs_qgroup_inherit **inherit)

{

	struct inode *inode;

	struct btrfs_pending_snapshot *pending_snapshot;
@@ -502,6 +508,10 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 
	pending_snapshot->dentry = dentry;

	pending_snapshot->root = root;

	pending_snapshot->readonly = readonly;

	if (inherit) {

		pending_snapshot->inherit = *inherit;

		*inherit = NULL;	/* take responsibility to free it */

	}



	trans = btrfs_start_transaction(root->fs_info->extent_root, 5);

	if (IS_ERR(trans)) {
@@ -635,7 +645,8 @@ static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 
static noinline int btrfs_mksubvol(struct path *parent,

				   char *name, int namelen,

				   struct btrfs_root *snap_src,

				   u64 *async_transid, bool readonly)

				   u64 *async_transid, bool readonly,

				   struct btrfs_qgroup_inherit **inherit)

{

	struct inode *dir  = parent->dentry->d_inode;

	struct dentry *dentry;
@@ -666,11 +677,11 @@ static noinline int btrfs_mksubvol(struct path *parent, 
		goto out_up_read;



	if (snap_src) {

		error = create_snapshot(snap_src, dentry,

					name, namelen, async_transid, readonly);

		error = create_snapshot(snap_src, dentry, name, namelen,

					async_transid, readonly, inherit);

	} else {

		error = create_subvol(BTRFS_I(dir)->root, dentry,

				      name, namelen, async_transid);

				      name, namelen, async_transid, inherit);

	}

	if (!error)

		fsnotify_mkdir(dir, dentry);
@@ -1379,11 +1390,9 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 
}



static noinline int btrfs_ioctl_snap_create_transid(struct file *file,

						    char *name,

						    unsigned long fd,

						    int subvol,

						    u64 *transid,

						    bool readonly)

				char *name, unsigned long fd, int subvol,

				u64 *transid, bool readonly,

				struct btrfs_qgroup_inherit **inherit)

{

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

	struct file *src_file;
@@ -1407,7 +1416,7 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 


	if (subvol) {

		ret = btrfs_mksubvol(&file->f_path, name, namelen,

				     NULL, transid, readonly);

				     NULL, transid, readonly, inherit);

	} else {

		struct inode *src_inode;

		src_file = fget(fd);
@@ -1426,7 +1435,7 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 
		}

		ret = btrfs_mksubvol(&file->f_path, name, namelen,

				     BTRFS_I(src_inode)->root,

				     transid, readonly);

				     transid, readonly, inherit);

		fput(src_file);

	}

out:
@@ -1446,7 +1455,7 @@ static noinline int btrfs_ioctl_snap_create(struct file *file, 


	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,

					      vol_args->fd, subvol,

					      NULL, false);

					      NULL, false, NULL);



	kfree(vol_args);

	return ret;
@@ -1460,6 +1469,7 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 
	u64 transid = 0;

	u64 *ptr = NULL;

	bool readonly = false;

	struct btrfs_qgroup_inherit *inherit = NULL;



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

	if (IS_ERR(vol_args))
@@ -1467,7 +1477,8 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 
	vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';



	if (vol_args->flags &

	    ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) {

	    ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |

	      BTRFS_SUBVOL_QGROUP_INHERIT)) {

		ret = -EOPNOTSUPP;

		goto out;

	}
@@ -1476,10 +1487,21 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 
		ptr = &transid;

	if (vol_args->flags & BTRFS_SUBVOL_RDONLY)

		readonly = true;

	if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {

		if (vol_args->size > PAGE_CACHE_SIZE) {

			ret = -EINVAL;

			goto out;

		}

		inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);

		if (IS_ERR(inherit)) {

			ret = PTR_ERR(inherit);

			goto out;

		}

	}



	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,

					      vol_args->fd, subvol,

					      ptr, readonly);

					      vol_args->fd, subvol, ptr,

					      readonly, &inherit);



	if (ret == 0 && ptr &&

	    copy_to_user(arg +
@@ -1488,6 +1510,7 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 
		ret = -EFAULT;

out:

	kfree(vol_args);

	kfree(inherit);

	return ret;

}
@@ -3588,6 +3611,8 @@ long btrfs_ioctl(struct file *file, unsigned int 
		return btrfs_ioctl_snap_create_v2(file, argp, 0);

	case BTRFS_IOC_SUBVOL_CREATE:

		return btrfs_ioctl_snap_create(file, argp, 1);

	case BTRFS_IOC_SUBVOL_CREATE_V2:

		return btrfs_ioctl_snap_create_v2(file, argp, 1);

	case BTRFS_IOC_SNAP_DESTROY:

		return btrfs_ioctl_snap_destroy(file, argp);

	case BTRFS_IOC_SUBVOL_GETFLAGS:

fs/btrfs/ioctl.h

+10 −1
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ struct btrfs_ioctl_vol_args { 


#define BTRFS_SUBVOL_CREATE_ASYNC	(1ULL << 0)

#define BTRFS_SUBVOL_RDONLY		(1ULL << 1)

#define BTRFS_SUBVOL_QGROUP_INHERIT	(1ULL << 2)

#define BTRFS_FSID_SIZE 16

#define BTRFS_UUID_SIZE 16
@@ -64,7 +65,13 @@ struct btrfs_ioctl_vol_args_v2 { 
	__s64 fd;

	__u64 transid;

	__u64 flags;

	union {

		struct {

			__u64 size;

			struct btrfs_qgroup_inherit __user *qgroup_inherit;

		};

		__u64 unused[4];

	};

	char name[BTRFS_SUBVOL_NAME_MAX + 1];

};
@@ -382,6 +389,8 @@ struct btrfs_ioctl_qgroup_create_args { 
#define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)

#define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \

				   struct btrfs_ioctl_vol_args_v2)

#define BTRFS_IOC_SUBVOL_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 24, \

				   struct btrfs_ioctl_vol_args_v2)

#define BTRFS_IOC_SUBVOL_GETFLAGS _IOR(BTRFS_IOCTL_MAGIC, 25, __u64)

#define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)

#define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \

fs/btrfs/transaction.c

+8 −0
Original line number Diff line number Diff line
@@ -990,6 +990,14 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, 
		}

	}



	ret = btrfs_qgroup_inherit(trans, fs_info, root->root_key.objectid,

				   objectid, pending->inherit);

	kfree(pending->inherit);

	if (ret) {

		pending->error = ret;

		goto fail;

	}



	key.objectid = objectid;

	key.offset = (u64)-1;

	key.type = BTRFS_ROOT_ITEM_KEY;

fs/btrfs/transaction.h

+1 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ struct btrfs_pending_snapshot { 
	struct dentry *dentry;

	struct btrfs_root *root;

	struct btrfs_root *snap;

	struct btrfs_qgroup_inherit *inherit;

	/* block reservation for the operation */

	struct btrfs_block_rsv block_rsv;

	/* extra metadata reseration for relocation */