Commit 66a2823c authored by Goldwyn Rodrigues's avatar Goldwyn Rodrigues Committed by David Sterba
Browse files

btrfs: sysfs: export currently running exclusive operation 



/sys/fs/<fsid>/exclusive_operation contains the currently executing
exclusive operation. Add a sysfs_notify() when operation end, so
userspace can be notified of exclusive operation is finished.

Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent c3e1f96c

fs/btrfs/ioctl.c

+1 −0
Original line number Diff line number Diff line
@@ -387,6 +387,7 @@ bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 
void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)

{

	WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);

	sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");

}



/*

fs/btrfs/sysfs.c

+37 −0
Original line number Diff line number Diff line
@@ -809,6 +809,42 @@ static ssize_t btrfs_checksum_show(struct kobject *kobj, 


BTRFS_ATTR(, checksum, btrfs_checksum_show);



static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,

		struct kobj_attribute *a, char *buf)

{

	struct btrfs_fs_info *fs_info = to_fs_info(kobj);

	const char *str;



	switch (READ_ONCE(fs_info->exclusive_operation)) {

		case  BTRFS_EXCLOP_NONE:

			str = "none\n";

			break;

		case BTRFS_EXCLOP_BALANCE:

			str = "balance\n";

			break;

		case BTRFS_EXCLOP_DEV_ADD:

			str = "device add\n";

			break;

		case BTRFS_EXCLOP_DEV_REMOVE:

			str = "device remove\n";

			break;

		case BTRFS_EXCLOP_DEV_REPLACE:

			str = "device replace\n";

			break;

		case BTRFS_EXCLOP_RESIZE:

			str = "resize\n";

			break;

		case BTRFS_EXCLOP_SWAP_ACTIVATE:

			str = "swap activate\n";

			break;

		default:

			str = "UNKNOWN\n";

			break;

	}

	return scnprintf(buf, PAGE_SIZE, "%s", str);

}

BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);



static const struct attribute *btrfs_attrs[] = {

	BTRFS_ATTR_PTR(, label),

	BTRFS_ATTR_PTR(, nodesize),
@@ -817,6 +853,7 @@ static const struct attribute *btrfs_attrs[] = { 
	BTRFS_ATTR_PTR(, quota_override),

	BTRFS_ATTR_PTR(, metadata_uuid),

	BTRFS_ATTR_PTR(, checksum),

	BTRFS_ATTR_PTR(, exclusive_operation),

	NULL,

};