42 static int thaw_super_locked(struct super_block *sb, enum freeze_holder who,
1900 static inline int freeze_inc(struct super_block *sb, enum freeze_holder who)  in freeze_inc()  argument
1902 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in freeze_inc()
1903 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in freeze_inc()
1905 	if (who & FREEZE_HOLDER_KERNEL)  in freeze_inc()
1907 	if (who & FREEZE_HOLDER_USERSPACE)  in freeze_inc()
1912 static inline int freeze_dec(struct super_block *sb, enum freeze_holder who)  in freeze_dec()  argument
1914 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in freeze_dec()
1915 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in freeze_dec()
1917 	if ((who & FREEZE_HOLDER_KERNEL) && sb->s_writers.freeze_kcount)  in freeze_dec()
1919 	if ((who & FREEZE_HOLDER_USERSPACE) && sb->s_writers.freeze_ucount)  in freeze_dec()
1924 static inline bool may_freeze(struct super_block *sb, enum freeze_holder who,  in may_freeze()  argument
1929 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in may_freeze()
1930 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in may_freeze()
1932 	if (who & FREEZE_EXCL) {  in may_freeze()
1933 		if (WARN_ON_ONCE(!(who & FREEZE_HOLDER_KERNEL)))  in may_freeze()
1935 		if (WARN_ON_ONCE(who & ~(FREEZE_EXCL | FREEZE_HOLDER_KERNEL)))  in may_freeze()
1952 	if (who & FREEZE_HOLDER_KERNEL)  in may_freeze()
1953 		return (who & FREEZE_MAY_NEST) ||  in may_freeze()
1955 	if (who & FREEZE_HOLDER_USERSPACE)  in may_freeze()
1956 		return (who & FREEZE_MAY_NEST) ||  in may_freeze()
1961 static inline bool may_unfreeze(struct super_block *sb, enum freeze_holder who,  in may_unfreeze()  argument
1966 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in may_unfreeze()
1967 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in may_unfreeze()
1969 	if (who & FREEZE_EXCL) {  in may_unfreeze()
1970 		if (WARN_ON_ONCE(!(who & FREEZE_HOLDER_KERNEL)))  in may_unfreeze()
1972 		if (WARN_ON_ONCE(who & ~(FREEZE_EXCL | FREEZE_HOLDER_KERNEL)))  in may_unfreeze()
1994 	if (who & FREEZE_HOLDER_KERNEL) {  in may_unfreeze()
2005 	if (who & FREEZE_HOLDER_USERSPACE)  in may_unfreeze()
2014  * @who: context that wants to freeze
2021  * @who should be:
2026  * The @who argument distinguishes between the kernel and userspace trying to
2067 int freeze_super(struct super_block *sb, enum freeze_holder who, const void *freeze_owner)  in freeze_super()  argument
2079 		if (may_freeze(sb, who, freeze_owner))  in freeze_super()
2080 			ret = !!WARN_ON_ONCE(freeze_inc(sb, who) == 1);  in freeze_super()
2100 		WARN_ON_ONCE(freeze_inc(sb, who) > 1);  in freeze_super()
2148 	WARN_ON_ONCE(freeze_inc(sb, who) > 1);  in freeze_super()
2164 static int thaw_super_locked(struct super_block *sb, enum freeze_holder who,  in thaw_super_locked()  argument
2172 	if (!may_unfreeze(sb, who, freeze_owner))  in thaw_super_locked()
2179 	if (freeze_dec(sb, who))  in thaw_super_locked()
2195 			freeze_inc(sb, who);  in thaw_super_locked()
2217  * @who: context that wants to freeze
2223  * @who should be:
2232 int thaw_super(struct super_block *sb, enum freeze_holder who,  in thaw_super()  argument
2239 	return thaw_super_locked(sb, who, freeze_owner);  in thaw_super()