[PATCH] ufs: wrong type cast

There are two ugly macros in ufs code:
#define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
#define USPI_UBH ((struct ufs_buffer_head *)uspi)
when uspi looks like
struct {
struct ufs_buffer_head ;
}
and USPI_UBH has some sence,
ucpi looks like
struct {
struct not_ufs_buffer_head;
}

To prevent bugs in future, this patch convert macros to inline function and
fix "ucpi" structure.
Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/ufs/cylinder.c

@@ -47,14 +47,14 @@ static void ufs_read_cylinder (struct super_block * sb,
 	ucpi = sbi->s_ucpi[bitmap_nr];
 	ucg = (struct ufs_cylinder_group *)sbi->s_ucg[cgno]->b_data;
 
-	UCPI_UBH->fragment = ufs_cgcmin(cgno);
-	UCPI_UBH->count = uspi->s_cgsize >> sb->s_blocksize_bits;
+	UCPI_UBH(ucpi)->fragment = ufs_cgcmin(cgno);
+	UCPI_UBH(ucpi)->count = uspi->s_cgsize >> sb->s_blocksize_bits;
 	/*
 	 * We have already the first fragment of cylinder group block in buffer
 	 */
-	UCPI_UBH->bh[0] = sbi->s_ucg[cgno];
-	for (i = 1; i < UCPI_UBH->count; i++)
-		if (!(UCPI_UBH->bh[i] = sb_bread(sb, UCPI_UBH->fragment + i)))
+	UCPI_UBH(ucpi)->bh[0] = sbi->s_ucg[cgno];
+	for (i = 1; i < UCPI_UBH(ucpi)->count; i++)
+		if (!(UCPI_UBH(ucpi)->bh[i] = sb_bread(sb, UCPI_UBH(ucpi)->fragment + i)))
 			goto failed;
 	sbi->s_cgno[bitmap_nr] = cgno;
 			
@@ -103,7 +103,7 @@ void ufs_put_cylinder (struct super_block * sb, unsigned bitmap_nr)
 		return;
 	}
 	ucpi = sbi->s_ucpi[bitmap_nr];
-	ucg = ubh_get_ucg(UCPI_UBH);
+	ucg = ubh_get_ucg(UCPI_UBH(ucpi));
 
 	if (uspi->s_ncg > UFS_MAX_GROUP_LOADED && bitmap_nr >= sbi->s_cg_loaded) {
 		ufs_panic (sb, "ufs_put_cylinder", "internal error");
@@ -116,9 +116,9 @@ void ufs_put_cylinder (struct super_block * sb, unsigned bitmap_nr)
 	ucg->cg_rotor = cpu_to_fs32(sb, ucpi->c_rotor);
 	ucg->cg_frotor = cpu_to_fs32(sb, ucpi->c_frotor);
 	ucg->cg_irotor = cpu_to_fs32(sb, ucpi->c_irotor);
-	ubh_mark_buffer_dirty (UCPI_UBH);
-	for (i = 1; i < UCPI_UBH->count; i++) {
-		brelse (UCPI_UBH->bh[i]);
+	ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
+	for (i = 1; i < UCPI_UBH(ucpi)->count; i++) {
+		brelse (UCPI_UBH(ucpi)->bh[i]);
 	}
 
 	sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;

fs/ufs/ialloc.c

@@ -91,7 +91,7 @@ void ufs_free_inode (struct inode * inode)
 		unlock_super (sb);
 		return;
 	}
-	ucg = ubh_get_ucg(UCPI_UBH);
+	ucg = ubh_get_ucg(UCPI_UBH(ucpi));
 	if (!ufs_cg_chkmagic(sb, ucg))
 		ufs_panic (sb, "ufs_free_fragments", "internal error, bad cg magic number");
 
@@ -104,10 +104,10 @@ void ufs_free_inode (struct inode * inode)
 
 	clear_inode (inode);
 
-	if (ubh_isclr (UCPI_UBH, ucpi->c_iusedoff, bit))
+	if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit))
 		ufs_error(sb, "ufs_free_inode", "bit already cleared for inode %u", ino);
 	else {
-		ubh_clrbit (UCPI_UBH, ucpi->c_iusedoff, bit);
+		ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit);
 		if (ino < ucpi->c_irotor)
 			ucpi->c_irotor = ino;
 		fs32_add(sb, &ucg->cg_cs.cs_nifree, 1);
@@ -121,11 +121,11 @@ void ufs_free_inode (struct inode * inode)
 		}
 	}
 
-	ubh_mark_buffer_dirty (USPI_UBH);
-	ubh_mark_buffer_dirty (UCPI_UBH);
+	ubh_mark_buffer_dirty (USPI_UBH(uspi));
+	ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
 	if (sb->s_flags & MS_SYNCHRONOUS) {
 		ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **) &ucpi);
-		ubh_wait_on_buffer (UCPI_UBH);
+		ubh_wait_on_buffer (UCPI_UBH(ucpi));
 	}
 	
 	sb->s_dirt = 1;
@@ -213,14 +213,14 @@ cg_found:
 	ucpi = ufs_load_cylinder (sb, cg);
 	if (!ucpi)
 		goto failed;
-	ucg = ubh_get_ucg(UCPI_UBH);
+	ucg = ubh_get_ucg(UCPI_UBH(ucpi));
 	if (!ufs_cg_chkmagic(sb, ucg)) 
 		ufs_panic (sb, "ufs_new_inode", "internal error, bad cg magic number");
 
 	start = ucpi->c_irotor;
-	bit = ubh_find_next_zero_bit (UCPI_UBH, ucpi->c_iusedoff, uspi->s_ipg, start);
+	bit = ubh_find_next_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, uspi->s_ipg, start);
 	if (!(bit < uspi->s_ipg)) {
-		bit = ubh_find_first_zero_bit (UCPI_UBH, ucpi->c_iusedoff, start);
+		bit = ubh_find_first_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, start);
 		if (!(bit < start)) {
 			ufs_error (sb, "ufs_new_inode",
 			    "cylinder group %u corrupted - error in inode bitmap\n", cg);
@@ -228,8 +228,8 @@ cg_found:
 		}
 	}
 	UFSD(("start = %u, bit = %u, ipg = %u\n", start, bit, uspi->s_ipg))
-	if (ubh_isclr (UCPI_UBH, ucpi->c_iusedoff, bit))
-		ubh_setbit (UCPI_UBH, ucpi->c_iusedoff, bit);
+	if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit))
+		ubh_setbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit);
 	else {
 		ufs_panic (sb, "ufs_new_inode", "internal error");
 		goto failed;
@@ -245,11 +245,11 @@ cg_found:
 		fs32_add(sb, &sbi->fs_cs(cg).cs_ndir, 1);
 	}
 
-	ubh_mark_buffer_dirty (USPI_UBH);
-	ubh_mark_buffer_dirty (UCPI_UBH);
+	ubh_mark_buffer_dirty (USPI_UBH(uspi));
+	ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
 	if (sb->s_flags & MS_SYNCHRONOUS) {
 		ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **) &ucpi);
-		ubh_wait_on_buffer (UCPI_UBH);
+		ubh_wait_on_buffer (UCPI_UBH(ucpi));
 	}
 	sb->s_dirt = 1;
 

fs/ufs/super.c

@@ -225,7 +225,7 @@ void ufs_error (struct super_block * sb, const char * function,
 	
 	if (!(sb->s_flags & MS_RDONLY)) {
 		usb1->fs_clean = UFS_FSBAD;
-		ubh_mark_buffer_dirty(USPI_UBH);
+		ubh_mark_buffer_dirty(USPI_UBH(uspi));
 		sb->s_dirt = 1;
 		sb->s_flags |= MS_RDONLY;
 	}
@@ -257,7 +257,7 @@ void ufs_panic (struct super_block * sb, const char * function,
 	
 	if (!(sb->s_flags & MS_RDONLY)) {
 		usb1->fs_clean = UFS_FSBAD;
-		ubh_mark_buffer_dirty(USPI_UBH);
+		ubh_mark_buffer_dirty(USPI_UBH(uspi));
 		sb->s_dirt = 1;
 	}
 	va_start (args, fmt);
@@ -1014,7 +1014,7 @@ static void ufs_write_super (struct super_block *sb) {
 		  || (flags & UFS_ST_MASK) == UFS_ST_SUNx86)
 			ufs_set_fs_state(sb, usb1, usb3,
 					UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
-		ubh_mark_buffer_dirty (USPI_UBH);
+		ubh_mark_buffer_dirty (USPI_UBH(uspi));
 	}
 	sb->s_dirt = 0;
 	UFSD(("EXIT\n"))
@@ -1083,7 +1083,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 		  || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) 
 			ufs_set_fs_state(sb, usb1, usb3,
 				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
-		ubh_mark_buffer_dirty (USPI_UBH);
+		ubh_mark_buffer_dirty (USPI_UBH(uspi));
 		sb->s_dirt = 0;
 		sb->s_flags |= MS_RDONLY;
 	}

fs/ufs/util.c

@@ -63,17 +63,17 @@ struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
 	count = size >> uspi->s_fshift;
 	if (count <= 0 || count > UFS_MAXFRAG)
 		return NULL;
-	USPI_UBH->fragment = fragment;
-	USPI_UBH->count = count;
+	USPI_UBH(uspi)->fragment = fragment;
+	USPI_UBH(uspi)->count = count;
 	for (i = 0; i < count; i++)
-		if (!(USPI_UBH->bh[i] = sb_bread(sb, fragment + i)))
+		if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
 			goto failed;
 	for (; i < UFS_MAXFRAG; i++)
-		USPI_UBH->bh[i] = NULL;
-	return USPI_UBH;
+		USPI_UBH(uspi)->bh[i] = NULL;
+	return USPI_UBH(uspi);
 failed:
 	for (j = 0; j < i; j++)
-		brelse (USPI_UBH->bh[j]);
+		brelse (USPI_UBH(uspi)->bh[j]);
 	return NULL;
 }
 
@@ -90,11 +90,11 @@ void ubh_brelse (struct ufs_buffer_head * ubh)
 void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
 {
 	unsigned i;
-	if (!USPI_UBH)
+	if (!USPI_UBH(uspi))
 		return;
-	for ( i = 0; i < USPI_UBH->count; i++ ) {
-		brelse (USPI_UBH->bh[i]);
-		USPI_UBH->bh[i] = NULL;
+	for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
+		brelse (USPI_UBH(uspi)->bh[i]);
+		USPI_UBH(uspi)->bh[i] = NULL;
 	}
 }
 

fs/ufs/util.h

@@ -17,10 +17,16 @@
 #define in_range(b,first,len)	((b)>=(first)&&(b)<(first)+(len))
 
 /*
- * macros used for retyping
+ * functions used for retyping
  */
-#define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
-#define USPI_UBH ((struct ufs_buffer_head *)uspi)
+static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi)
+{
+	return &cpi->c_ubh;
+}
+static inline struct ufs_buffer_head *USPI_UBH(struct ufs_sb_private_info *spi)
+{
+	return &spi->s_ubh;
+}
 
 
 
@@ -326,10 +332,10 @@ static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
  * Macros to access cylinder group array structures
  */
 #define ubh_cg_blktot(ucpi,cylno) \
-	(*((__fs32*)ubh_get_addr(UCPI_UBH, (ucpi)->c_btotoff + ((cylno) << 2))))
+	(*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2))))
 
 #define ubh_cg_blks(ucpi,cylno,rpos) \
-	(*((__fs16*)ubh_get_addr(UCPI_UBH, \
+	(*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \
 	(ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
 
 /*

include/linux/ufs_fs.h

@@ -666,7 +666,7 @@ struct ufs_buffer_head {
 };
 
 struct ufs_cg_private_info {
-	struct ufs_cylinder_group ucg;
+	struct ufs_buffer_head c_ubh;
 	__u32	c_cgx;		/* number of cylidner group */
 	__u16	c_ncyl;		/* number of cyl's this cg */
 	__u16	c_niblk;	/* number of inode blocks this cg */