42 static int thaw_super_locked(struct super_block *sb, enum freeze_holder who);
1908 static inline int freeze_inc(struct super_block *sb, enum freeze_holder who)  in freeze_inc()  argument
1910 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in freeze_inc()
1911 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in freeze_inc()
1913 	if (who & FREEZE_HOLDER_KERNEL)  in freeze_inc()
1915 	if (who & FREEZE_HOLDER_USERSPACE)  in freeze_inc()
1920 static inline int freeze_dec(struct super_block *sb, enum freeze_holder who)  in freeze_dec()  argument
1922 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in freeze_dec()
1923 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in freeze_dec()
1925 	if ((who & FREEZE_HOLDER_KERNEL) && sb->s_writers.freeze_kcount)  in freeze_dec()
1927 	if ((who & FREEZE_HOLDER_USERSPACE) && sb->s_writers.freeze_ucount)  in freeze_dec()
1932 static inline bool may_freeze(struct super_block *sb, enum freeze_holder who)  in may_freeze()  argument
1934 	WARN_ON_ONCE((who & ~FREEZE_FLAGS));  in may_freeze()
1935 	WARN_ON_ONCE(hweight32(who & FREEZE_HOLDERS) > 1);  in may_freeze()
1937 	if (who & FREEZE_HOLDER_KERNEL)  in may_freeze()
1938 		return (who & FREEZE_MAY_NEST) ||  in may_freeze()
1940 	if (who & FREEZE_HOLDER_USERSPACE)  in may_freeze()
1941 		return (who & FREEZE_MAY_NEST) ||  in may_freeze()
1949  * @who: context that wants to freeze
1955  * @who should be:
1960  * The @who argument distinguishes between the kernel and userspace trying to
2001 int freeze_super(struct super_block *sb, enum freeze_holder who)  in freeze_super()  argument
2013 		if (may_freeze(sb, who))  in freeze_super()
2014 			ret = !!WARN_ON_ONCE(freeze_inc(sb, who) == 1);  in freeze_super()
2034 		WARN_ON_ONCE(freeze_inc(sb, who) > 1);  in freeze_super()
2081 	WARN_ON_ONCE(freeze_inc(sb, who) > 1);  in freeze_super()
2096 static int thaw_super_locked(struct super_block *sb, enum freeze_holder who)  in thaw_super_locked()  argument
2107 	if (freeze_dec(sb, who))  in thaw_super_locked()
2122 			freeze_inc(sb, who);  in thaw_super_locked()
2143  * @who: context that wants to freeze
2148  * @who should be:
2157 int thaw_super(struct super_block *sb, enum freeze_holder who)  in thaw_super()  argument
2163 	return thaw_super_locked(sb, who);  in thaw_super()