diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index c5bdea7c23a9..87f6b51a895d 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -286,7 +286,7 @@ void ufs_warning (struct super_block * sb, const char * function,
 }
 
 enum {
-	Opt_type_old, Opt_type_sunx86, Opt_type_sun, Opt_type_44bsd,
+	Opt_type_old, Opt_type_sunx86, Opt_type_sun, Opt_type_sunos, Opt_type_44bsd,
 	Opt_type_ufs2, Opt_type_hp, Opt_type_nextstepcd, Opt_type_nextstep,
 	Opt_type_openstep, Opt_onerror_panic, Opt_onerror_lock,
 	Opt_onerror_umount, Opt_onerror_repair, Opt_err
@@ -296,6 +296,7 @@ static match_table_t tokens = {
 	{Opt_type_old, "ufstype=old"},
 	{Opt_type_sunx86, "ufstype=sunx86"},
 	{Opt_type_sun, "ufstype=sun"},
+	{Opt_type_sunos, "ufstype=sunos"},
 	{Opt_type_44bsd, "ufstype=44bsd"},
 	{Opt_type_ufs2, "ufstype=ufs2"},
 	{Opt_type_ufs2, "ufstype=5xbsd"},
@@ -339,6 +340,10 @@ static int ufs_parse_options (char * options, unsigned * mount_options)
 			ufs_clear_opt (*mount_options, UFSTYPE);
 			ufs_set_opt (*mount_options, UFSTYPE_SUN);
 			break;
+		case Opt_type_sunos:
+			ufs_clear_opt(*mount_options, UFSTYPE);
+			ufs_set_opt(*mount_options, UFSTYPE_SUNOS);
+			break;
 		case Opt_type_44bsd:
 			ufs_clear_opt (*mount_options, UFSTYPE);
 			ufs_set_opt (*mount_options, UFSTYPE_44BSD);
@@ -654,8 +659,8 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 		ufs_set_opt (sbi->s_mount_opt, UFSTYPE_OLD);
 	}
 
-	sbi->s_uspi = uspi =
-		kmalloc (sizeof(struct ufs_sb_private_info), GFP_KERNEL);
+	uspi = kzalloc(sizeof(struct ufs_sb_private_info), GFP_KERNEL);
+	sbi->s_uspi = uspi;
 	if (!uspi)
 		goto failed;
 	uspi->s_dirblksize = UFS_SECTOR_SIZE;
@@ -692,10 +697,22 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 		uspi->s_fshift = 10;
 		uspi->s_sbsize = super_block_size = 2048;
 		uspi->s_sbbase = 0;
-		uspi->s_maxsymlinklen = 56;
+		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
 		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUN | UFS_CG_SUN;
 		break;
 
+	case UFS_MOUNT_UFSTYPE_SUNOS:
+		UFSD(("ufstype=sunos\n"))
+		uspi->s_fsize = block_size = 1024;
+		uspi->s_fmask = ~(1024 - 1);
+		uspi->s_fshift = 10;
+		uspi->s_sbsize = 2048;
+		super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
+		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_SUNOS | UFS_CG_SUN;
+		break;
+
 	case UFS_MOUNT_UFSTYPE_SUNx86:
 		UFSD("ufstype=sunx86\n");
 		uspi->s_fsize = block_size = 1024;
@@ -703,7 +720,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 		uspi->s_fshift = 10;
 		uspi->s_sbsize = super_block_size = 2048;
 		uspi->s_sbbase = 0;
-		uspi->s_maxsymlinklen = 56;
+		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
 		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUNx86 | UFS_CG_SUN;
 		break;
 
@@ -805,11 +822,18 @@ again:
 	if (!ubh) 
             goto failed;
 
-	
 	usb1 = ubh_get_usb_first(uspi);
 	usb2 = ubh_get_usb_second(uspi);
 	usb3 = ubh_get_usb_third(uspi);
 
+	/* Sort out mod used on SunOS 4.1.3 for fs_state */
+	uspi->s_postblformat = fs32_to_cpu(sb, usb3->fs_postblformat);
+	if (((flags & UFS_ST_MASK) == UFS_ST_SUNOS) &&
+	    (uspi->s_postblformat != UFS_42POSTBLFMT)) {
+		flags &= ~UFS_ST_MASK;
+		flags |=  UFS_ST_SUN;
+	}
+
 	/*
 	 * Check ufs magic number
 	 */
@@ -904,6 +928,7 @@ magic_found:
 	if (((flags & UFS_ST_MASK) == UFS_ST_44BSD) ||
 	  ((flags & UFS_ST_MASK) == UFS_ST_OLD) ||
 	  (((flags & UFS_ST_MASK) == UFS_ST_SUN || 
+	    (flags & UFS_ST_MASK) == UFS_ST_SUNOS ||
 	  (flags & UFS_ST_MASK) == UFS_ST_SUNx86) && 
 	  (ufs_get_fs_state(sb, usb1, usb3) == (UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time))))) {
 		switch(usb1->fs_clean) {
@@ -995,7 +1020,6 @@ magic_found:
 	uspi->s_contigsumsize = fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_contigsumsize);
 	uspi->s_qbmask = ufs_get_fs_qbmask(sb, usb3);
 	uspi->s_qfmask = ufs_get_fs_qfmask(sb, usb3);
-	uspi->s_postblformat = fs32_to_cpu(sb, usb3->fs_postblformat);
 	uspi->s_nrpos = fs32_to_cpu(sb, usb3->fs_nrpos);
 	uspi->s_postbloff = fs32_to_cpu(sb, usb3->fs_postbloff);
 	uspi->s_rotbloff = fs32_to_cpu(sb, usb3->fs_rotbloff);
@@ -1077,6 +1101,7 @@ static void ufs_write_super(struct super_block *sb)
 	if (!(sb->s_flags & MS_RDONLY)) {
 		usb1->fs_time = cpu_to_fs32(sb, get_seconds());
 		if ((flags & UFS_ST_MASK) == UFS_ST_SUN 
+		  || (flags & UFS_ST_MASK) == UFS_ST_SUNOS
 		  || (flags & UFS_ST_MASK) == UFS_ST_SUNx86)
 			ufs_set_fs_state(sb, usb1, usb3,
 					UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
@@ -1146,6 +1171,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 		ufs_put_super_internal(sb);
 		usb1->fs_time = cpu_to_fs32(sb, get_seconds());
 		if ((flags & UFS_ST_MASK) == UFS_ST_SUN
+		  || (flags & UFS_ST_MASK) == UFS_ST_SUNOS
 		  || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) 
 			ufs_set_fs_state(sb, usb1, usb3,
 				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
@@ -1162,6 +1188,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 		return -EINVAL;
 #else
 		if (ufstype != UFS_MOUNT_UFSTYPE_SUN && 
+		    ufstype != UFS_MOUNT_UFSTYPE_SUNOS &&
 		    ufstype != UFS_MOUNT_UFSTYPE_44BSD &&
 		    ufstype != UFS_MOUNT_UFSTYPE_SUNx86 &&
 		    ufstype != UFS_MOUNT_UFSTYPE_UFS2) {
diff --git a/fs/ufs/util.h b/fs/ufs/util.h
index 79a340a1909e..b26fc4dec1e7 100644
--- a/fs/ufs/util.h
+++ b/fs/ufs/util.h
@@ -38,6 +38,10 @@ ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
 		 struct ufs_super_block_third *usb3)
 {
 	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUNOS:
+		if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT)
+			return fs32_to_cpu(sb, usb1->fs_u0.fs_sun.fs_state);
+		/* Fall Through to UFS_ST_SUN */
 	case UFS_ST_SUN:
 		return fs32_to_cpu(sb, usb3->fs_un2.fs_sun.fs_state);
 	case UFS_ST_SUNx86:
@@ -53,6 +57,12 @@ ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
 		 struct ufs_super_block_third *usb3, s32 value)
 {
 	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUNOS:
+		if (fs32_to_cpu(sb, usb3->fs_postblformat == UFS_42POSTBLFMT)) {
+			usb1->fs_u0.fs_sun.fs_state = cpu_to_fs32(sb, value);
+			break;
+		}
+		/* Fall Through to UFS_ST_SUN */
 	case UFS_ST_SUN:
 		usb3->fs_un2.fs_sun.fs_state = cpu_to_fs32(sb, value);
 		break;
@@ -81,6 +91,7 @@ ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
 	__fs64 tmp;
 
 	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUNOS:
 	case UFS_ST_SUN:
 		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0];
 		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1];
@@ -104,6 +115,7 @@ ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
 	__fs64 tmp;
 
 	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUNOS:
 	case UFS_ST_SUN:
 		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0];
 		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1];
@@ -179,10 +191,12 @@ static inline u32
 ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
 {
 	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
-	case UFS_UID_EFT:
-		return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
 	case UFS_UID_44BSD:
 		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
+	case UFS_UID_EFT:
+		if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
+			return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
+		/* Fall through */
 	default:
 		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
 	}
@@ -192,24 +206,31 @@ static inline void
 ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
 {
 	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
-	case UFS_UID_EFT:
-		inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
-		break;
 	case UFS_UID_44BSD:
 		inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
+		inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
+		break;
+	case UFS_UID_EFT:
+		inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
+		if (value > 0xFFFF)
+			value = 0xFFFF;
+		/* Fall through */
+	default:
+		inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
 		break;
 	}
-	inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value); 
 }
 
 static inline u32
 ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
 {
 	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
-	case UFS_UID_EFT:
-		return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
 	case UFS_UID_44BSD:
 		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
+	case UFS_UID_EFT:
+		if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
+			return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
+		/* Fall through */
 	default:
 		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
 	}
@@ -219,14 +240,19 @@ static inline void
 ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
 {
 	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
-	case UFS_UID_EFT:
-		inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
-		break;
 	case UFS_UID_44BSD:
 		inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
+		inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
+		break;
+	case UFS_UID_EFT:
+		inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
+		if (value > 0xFFFF)
+			value = 0xFFFF;
+		/* Fall through */
+	default:
+		inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
 		break;
 	}
-	inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
 }
 
 extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
diff --git a/include/linux/ufs_fs.h b/include/linux/ufs_fs.h
index daeba22b7656..52730d2c9ad9 100644
--- a/include/linux/ufs_fs.h
+++ b/include/linux/ufs_fs.h
@@ -170,8 +170,9 @@ typedef __u16 __bitwise __fs16;
 #define UFS_ST_MASK		0x00000700	/* mask for the following */
 #define UFS_ST_OLD		0x00000000
 #define UFS_ST_44BSD		0x00000100
-#define UFS_ST_SUN		0x00000200
-#define UFS_ST_SUNx86		0x00000400
+#define UFS_ST_SUN		0x00000200 /* Solaris */
+#define UFS_ST_SUNOS		0x00000300
+#define UFS_ST_SUNx86		0x00000400 /* Solaris x86 */
 /*cylinder group encoding */
 #define UFS_CG_MASK		0x00003000	/* mask for the following */
 #define UFS_CG_OLD		0x00000000
@@ -204,6 +205,7 @@ typedef __u16 __bitwise __fs16;
 #define UFS_MOUNT_UFSTYPE_SUNx86	0x00000400
 #define UFS_MOUNT_UFSTYPE_HP	        0x00000800
 #define UFS_MOUNT_UFSTYPE_UFS2		0x00001000
+#define UFS_MOUNT_UFSTYPE_SUNOS		0x00002000
 
 #define ufs_clear_opt(o,opt)	o &= ~UFS_MOUNT_##opt
 #define ufs_set_opt(o,opt)	o |= UFS_MOUNT_##opt
@@ -374,7 +376,14 @@ struct ufs_csum_core {
  * struct ufs_super_block_(first,second,third) instead.
  */
 struct ufs_super_block {
-	__fs32	fs_link;	/* UNUSED */
+	union {
+		struct {
+			__fs32	fs_link;	/* UNUSED */
+		} fs_42;
+		struct {
+			__fs32	fs_state;	/* file system state flag */
+		} fs_sun;
+	} fs_u0;
 	__fs32	fs_rlink;	/* UNUSED */
 	__fs32	fs_sblkno;	/* addr of super-block in filesys */
 	__fs32	fs_cblkno;	/* offset of cyl-block in filesys */
@@ -545,6 +554,15 @@ struct ufs_super_block {
 #define	CG_MAGIC	0x090255
 #define ufs_cg_chkmagic(sb, ucg) \
 	(fs32_to_cpu((sb), (ucg)->cg_magic) == CG_MAGIC)
+/*
+ * Macros for access to old cylinder group array structures
+ */
+#define ufs_ocg_blktot(sb, ucg)      fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_btot)
+#define ufs_ocg_blks(sb, ucg, cylno) fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_b[cylno])
+#define ufs_ocg_inosused(sb, ucg)    fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_iused)
+#define ufs_ocg_blksfree(sb, ucg)    fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_free)
+#define ufs_ocg_chkmagic(sb, ucg) \
+	(fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_magic) == CG_MAGIC)
 
 /*
  * size of this structure is 172 B
@@ -590,6 +608,28 @@ struct	ufs_cylinder_group {
 /* actually longer */
 };
 
+/* Historic Cylinder group info */
+struct ufs_old_cylinder_group {
+	__fs32	cg_link;		/* linked list of cyl groups */
+	__fs32	cg_rlink;		/* for incore cyl groups     */
+	__fs32	cg_time;		/* time last written */
+	__fs32	cg_cgx;			/* we are the cgx'th cylinder group */
+	__fs16	cg_ncyl;		/* number of cyl's this cg */
+	__fs16	cg_niblk;		/* number of inode blocks this cg */
+	__fs32	cg_ndblk;		/* number of data blocks this cg */
+	struct	ufs_csum cg_cs;		/* cylinder summary information */
+	__fs32	cg_rotor;		/* position of last used block */
+	__fs32	cg_frotor;		/* position of last used frag */
+	__fs32	cg_irotor;		/* position of last used inode */
+	__fs32	cg_frsum[8];		/* counts of available frags */
+	__fs32	cg_btot[32];		/* block totals per cylinder */
+	__fs16	cg_b[32][8];		/* positions of free blocks */
+	__u8	cg_iused[256];		/* used inode map */
+	__fs32	cg_magic;		/* magic number */
+	__u8	cg_free[1];		/* free block map */
+/* actually longer */
+};
+
 /*
  * structure of an on-disk inode
  */
@@ -796,7 +836,14 @@ struct ufs_sb_private_info {
  *	ufs_super_block_third	356
  */
 struct ufs_super_block_first {
-	__fs32	fs_link;
+	union {
+		struct {
+			__fs32	fs_link;	/* UNUSED */
+		} fs_42;
+		struct {
+			__fs32	fs_state;	/* file system state flag */
+		} fs_sun;
+	} fs_u0;
 	__fs32	fs_rlink;
 	__fs32	fs_sblkno;
 	__fs32	fs_cblkno;