42 static int thaw_super_locked(struct super_block *sb, enum freeze_holder who);
1963 static inline int freeze_inc(struct super_block *sb, enum freeze_holder who)  in freeze_inc()  argument
1965 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in freeze_inc()
1966 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in freeze_inc()
1968 	if (who & FREEZE_HOLDER_KERNEL)  in freeze_inc()
1970 	if (who & FREEZE_HOLDER_USERSPACE)  in freeze_inc()
1975 static inline int freeze_dec(struct super_block *sb, enum freeze_holder who)  in freeze_dec()  argument
1977 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in freeze_dec()
1978 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in freeze_dec()
1980 	if ((who & FREEZE_HOLDER_KERNEL) && sb->s_writers.freeze_kcount)  in freeze_dec()
1982 	if ((who & FREEZE_HOLDER_USERSPACE) && sb->s_writers.freeze_ucount)  in freeze_dec()
1987 static inline bool may_freeze(struct super_block *sb, enum freeze_holder who)  in may_freeze()  argument
1989 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in may_freeze()
1990 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in may_freeze()
1992 	if (who & FREEZE_HOLDER_KERNEL)  in may_freeze()
1993 		return (who & FREEZE_MAY_NEST) ||  in may_freeze()
1995 	if (who & FREEZE_HOLDER_USERSPACE)  in may_freeze()
1996 		return (who & FREEZE_MAY_NEST) ||  in may_freeze()
2004  * @who: context that wants to freeze
2010  * @who should be:
2015  * The @who argument distinguishes between the kernel and userspace trying to
2056 int freeze_super(struct super_block *sb, enum freeze_holder who)  in freeze_super()  argument
2068 		if (may_freeze(sb, who))  in freeze_super()
2069 			ret = !!WARN_ON_ONCE(freeze_inc(sb, who) == 1);  in freeze_super()
2089 		WARN_ON_ONCE(freeze_inc(sb, who) > 1);  in freeze_super()
2136 	WARN_ON_ONCE(freeze_inc(sb, who) > 1);  in freeze_super()
2151 static int thaw_super_locked(struct super_block *sb, enum freeze_holder who)  in thaw_super_locked()  argument
2162 	if (freeze_dec(sb, who))  in thaw_super_locked()
2177 			freeze_inc(sb, who);  in thaw_super_locked()
2198  * @who: context that wants to freeze
2203  * @who should be:
2212 int thaw_super(struct super_block *sb, enum freeze_holder who)  in thaw_super()  argument
2218 	return thaw_super_locked(sb, who);  in thaw_super()