isofs: use unsigned char types consistently

Based on the discussion about the signed character field for the year,
I went through all fields in the iso9660 and rockridge standards to see
whether they should used signed or unsigned characters. Only a single
8-bit value is defined as signed per 'section 7.1.2': the timezone
offset in a timestamp, this has always been handled correctly through
explicit sign-extension.

All others are either '7.1.1 8-bit unsigned numerical values' or
composite fields. I also read the linux source code and came to the
same conclusion, also I could not find any other part of the
implementation that actually behaves differently for signed or
unsigned values.

Since it is still ambigous to use plain 'char' in interface definitions,
I'm changing all fields representing numbers and reserved bytes to
the unambiguous '__u8'. Fields that hold actual strings are left as
'char' arrays. I built the code with '-Wpointer-sign -Wsign-compare'
to see if anything got left out, but couldn't find anything wrong
with the remaining warnings.

This patch should not change runtime behavior and does not need to
be backported.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jan Kara <jack@suse.cz>

2 files changed, 41 insertions, 41 deletions

diff --git a/fs/isofs/isofs.h b/fs/isofs/isofs.h
index bd40475854316..c882f207dd5c9 100644
--- a/fs/isofs/isofs.h
+++ b/fs/isofs/isofs.h
@@ -72,36 +72,36 @@ static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
 	return container_of(inode, struct iso_inode_info, vfs_inode);
 }
 
-static inline int isonum_711(char *p)
+static inline int isonum_711(u8 *p)
 {
-	return *(u8 *)p;
+	return *p;
 }
-static inline int isonum_712(char *p)
+static inline int isonum_712(s8 *p)
 {
-	return *(s8 *)p;
+	return *p;
 }
-static inline unsigned int isonum_721(char *p)
+static inline unsigned int isonum_721(u8 *p)
 {
 	return get_unaligned_le16(p);
 }
-static inline unsigned int isonum_722(char *p)
+static inline unsigned int isonum_722(u8 *p)
 {
 	return get_unaligned_be16(p);
 }
-static inline unsigned int isonum_723(char *p)
+static inline unsigned int isonum_723(u8 *p)
 {
 	/* Ignore bigendian datum due to broken mastering programs */
 	return get_unaligned_le16(p);
 }
-static inline unsigned int isonum_731(char *p)
+static inline unsigned int isonum_731(u8 *p)
 {
 	return get_unaligned_le32(p);
 }
-static inline unsigned int isonum_732(char *p)
+static inline unsigned int isonum_732(u8 *p)
 {
 	return get_unaligned_be32(p);
 }
-static inline unsigned int isonum_733(char *p)
+static inline unsigned int isonum_733(u8 *p)
 {
 	/* Ignore bigendian datum due to broken mastering programs */
 	return get_unaligned_le32(p);
diff --git a/fs/isofs/rock.h b/fs/isofs/rock.h
index f835976ce0333..8780d67c6ca5c 100644
--- a/fs/isofs/rock.h
+++ b/fs/isofs/rock.h
@@ -6,62 +6,62 @@
  */
 
 struct SU_SP_s {
-	unsigned char magic[2];
-	unsigned char skip;
+	__u8 magic[2];
+	__u8 skip;
 } __attribute__ ((packed));
 
 struct SU_CE_s {
-	char extent[8];
-	char offset[8];
-	char size[8];
+	__u8 extent[8];
+	__u8 offset[8];
+	__u8 size[8];
 };
 
 struct SU_ER_s {
-	unsigned char len_id;
-	unsigned char len_des;
-	unsigned char len_src;
-	unsigned char ext_ver;
-	char data[0];
+	__u8 len_id;
+	__u8 len_des;
+	__u8 len_src;
+	__u8 ext_ver;
+	__u8 data[0];
 } __attribute__ ((packed));
 
 struct RR_RR_s {
-	char flags[1];
+	__u8 flags[1];
 } __attribute__ ((packed));
 
 struct RR_PX_s {
-	char mode[8];
-	char n_links[8];
-	char uid[8];
-	char gid[8];
+	__u8 mode[8];
+	__u8 n_links[8];
+	__u8 uid[8];
+	__u8 gid[8];
 };
 
 struct RR_PN_s {
-	char dev_high[8];
-	char dev_low[8];
+	__u8 dev_high[8];
+	__u8 dev_low[8];
 };
 
 struct SL_component {
-	unsigned char flags;
-	unsigned char len;
-	char text[0];
+	__u8 flags;
+	__u8 len;
+	__u8 text[0];
 } __attribute__ ((packed));
 
 struct RR_SL_s {
-	unsigned char flags;
+	__u8 flags;
 	struct SL_component link;
 } __attribute__ ((packed));
 
 struct RR_NM_s {
-	unsigned char flags;
+	__u8 flags;
 	char name[0];
 } __attribute__ ((packed));
 
 struct RR_CL_s {
-	char location[8];
+	__u8 location[8];
 };
 
 struct RR_PL_s {
-	char location[8];
+	__u8 location[8];
 };
 
 struct stamp {
@@ -69,15 +69,15 @@ struct stamp {
 } __attribute__ ((packed));
 
 struct RR_TF_s {
-	char flags;
+	__u8 flags;
 	struct stamp times[0];	/* Variable number of these beasts */
 } __attribute__ ((packed));
 
 /* Linux-specific extension for transparent decompression */
 struct RR_ZF_s {
-	char algorithm[2];
-	char parms[2];
-	char real_size[8];
+	__u8 algorithm[2];
+	__u8 parms[2];
+	__u8 real_size[8];
 };
 
 /*
@@ -93,9 +93,9 @@ struct RR_ZF_s {
 #define TF_LONG_FORM 128
 
 struct rock_ridge {
-	char signature[2];
-	unsigned char len;
-	unsigned char version;
+	__u8 signature[2];
+	__u8 len;
+	__u8 version;
 	union {
 		struct SU_SP_s SP;
 		struct SU_CE_s CE;