linux/fs/btrfs/fs.c

// SPDX-License-Identifier: GPL-2.0

#include "messages.h"
#include "ctree.h"
#include "fs.h"
#include "accessors.h"

void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
			     const char *name)
{
	struct btrfs_super_block *disk_super;
	u64 features;

	disk_super = fs_info->super_copy;
	features = btrfs_super_incompat_flags(disk_super);
	if (!(features & flag)) {
		spin_lock(&fs_info->super_lock);
		features = btrfs_super_incompat_flags(disk_super);
		if (!(features & flag)) {
			features |= flag;
			btrfs_set_super_incompat_flags(disk_super, features);
			btrfs_info(fs_info,
				"setting incompat feature flag for %s (0x%llx)",
				name, flag);
		}
		spin_unlock(&fs_info->super_lock);
	}
}

void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
			       const char *name)
{
	struct btrfs_super_block *disk_super;
	u64 features;

	disk_super = fs_info->super_copy;
	features = btrfs_super_incompat_flags(disk_super);
	if (features & flag) {
		spin_lock(&fs_info->super_lock);
		features = btrfs_super_incompat_flags(disk_super);
		if (features & flag) {
			features &= ~flag;
			btrfs_set_super_incompat_flags(disk_super, features);
			btrfs_info(fs_info,
				"clearing incompat feature flag for %s (0x%llx)",
				name, flag);
		}
		spin_unlock(&fs_info->super_lock);
	}
}

void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
			      const char *name)
{
	struct btrfs_super_block *disk_super;
	u64 features;

	disk_super = fs_info->super_copy;
	features = btrfs_super_compat_ro_flags(disk_super);
	if (!(features & flag)) {
		spin_lock(&fs_info->super_lock);
		features = btrfs_super_compat_ro_flags(disk_super);
		if (!(features & flag)) {
			features |= flag;
			btrfs_set_super_compat_ro_flags(disk_super, features);
			btrfs_info(fs_info,
				"setting compat-ro feature flag for %s (0x%llx)",
				name, flag);
		}
		spin_unlock(&fs_info->super_lock);
	}
}

void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
				const char *name)
{
	struct btrfs_super_block *disk_super;
	u64 features;

	disk_super = fs_info->super_copy;
	features = btrfs_super_compat_ro_flags(disk_super);
	if (features & flag) {
		spin_lock(&fs_info->super_lock);
		features = btrfs_super_compat_ro_flags(disk_super);
		if (features & flag) {
			features &= ~flag;
			btrfs_set_super_compat_ro_flags(disk_super, features);
			btrfs_info(fs_info,
				"clearing compat-ro feature flag for %s (0x%llx)",
				name, flag);
		}
		spin_unlock(&fs_info->super_lock);
	}
}