udf: Convert UDF_SB(sb)->s_flags to use bitops

Use atomic bitops to manipulate with sb flags to make manipulation safe
without any locking.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 16 insertions, 4 deletions

diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index d113b72c2768..9f38a6ca4fd5 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -2,6 +2,7 @@
 #define __LINUX_UDF_SB_H
 
 #include <linux/mutex.h>
+#include <linux/bitops.h>
 
 /* Since UDF 2.01 is ISO 13346 based... */
 #define UDF_SUPER_MAGIC                 0x15013346
@@ -139,7 +140,7 @@ struct udf_sb_info {
         __u16                   s_udfrev;
 
         /* Miscellaneous flags */
-        __u32                   s_flags;
+        unsigned long           s_flags;
 
         /* Encoding info */
         struct nls_table        *s_nls_map;
@@ -161,8 +162,19 @@ struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi);
 
 int udf_compute_nr_groups(struct super_block *sb, u32 partition);
 
-#define UDF_QUERY_FLAG(X,Y)                     ( UDF_SB(X)->s_flags & ( 1 << (Y) ) )
-#define UDF_SET_FLAG(X,Y)                       ( UDF_SB(X)->s_flags |= ( 1 << (Y) ) )
-#define UDF_CLEAR_FLAG(X,Y)                     ( UDF_SB(X)->s_flags &= ~( 1 << (Y) ) )
+static inline int UDF_QUERY_FLAG(struct super_block *sb, int flag)
+{
+        return test_bit(flag, &UDF_SB(sb)->s_flags);
+}
+
+static inline void UDF_SET_FLAG(struct super_block *sb, int flag)
+{
+        set_bit(flag, &UDF_SB(sb)->s_flags);
+}
+
+static inline void UDF_CLEAR_FLAG(struct super_block *sb, int flag)
+{
+        clear_bit(flag, &UDF_SB(sb)->s_flags);
+}
 
 #endif /* __LINUX_UDF_SB_H */