Add in SunOS 4.1.x compatible mode for UFS

Add in support for SunOS 4.1.x flavor of BSD 4.2 UFS filing system Macros have
been put in to alow suport for the old static table Cylinder Groups but this
implementation does not use them yet.

This also fixes Solaris UFS filing system access by disabling fast symbolic
links as Sun's version of UFS does not support on-disk fast symbolic links.

Tested by:
  Ppartitioning a new disk using SunOS 4.1.1, creating a UFS filing system on
  one of the partitions and writing some files to the filing system.
  Using Linux-2.6.22 (patched) to read the files and then write a shed load of
  files to the UFS partition.
  Using SunOS 4.1.1 to verify the filing system is OK and to check the files.
The test host is a sun4c SS1 Clone.

[akpm@linux-foundation.org: coding style fixes]
[adobriyan@gmail.com: fix oops]
Signed-off-by: Mark Fortescue <mark@mtfhpc.demon.co.uk>
Cc: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 51 insertions, 4 deletions

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;