[PATCH] ufs: make fsck -f happy

ufs super block contains some statistic about file systems, like amount of
directories, free blocks, inodes and so on.

UFS1 hold this information in one location and uses 32bit integers for such
information, UFS2 hold statistic in another location and uses 64bit integers.

There is transition variant, if UFS1 has type 44BSD and flags field in super
block has some special value this mean that we work with statistic like UFS2
does.  and this also means that nobody care about old(UFS1) statistic.

So if start fsck against such file system, after usage linux ufs driver, it
found error: at now only UFS1 like statistic is updated.

This patch should fix this.  Also it contains some minor cleanup: CodingSytle
and remove unused variables.

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 103 insertions, 37 deletions

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 3aadbd3167a6..74ef5e9bedff 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -381,24 +381,57 @@ static int ufs_parse_options (char * options, unsigned * mount_options)
 }
 
 /*
- * Read on-disk structures associated with cylinder groups
+ * Diffrent types of UFS hold fs_cstotal in different
+ * places, and use diffrent data structure for it.
+ * To make things simplier we just copy fs_cstotal to ufs_sb_private_info
  */
-static int ufs_read_cylinder_structures (struct super_block *sb)
+static void ufs_setup_cstotal(struct super_block *sb)
 {
 	struct ufs_sb_info *sbi = UFS_SB(sb);
 	struct ufs_sb_private_info *uspi = sbi->s_uspi;
+	struct ufs_super_block_first *usb1;
+	struct ufs_super_block_second *usb2;
 	struct ufs_super_block_third *usb3;
+	unsigned mtype = sbi->s_mount_opt & UFS_MOUNT_UFSTYPE;
+
+	UFSD("ENTER, mtype=%u\n", mtype);
+	usb1 = ubh_get_usb_first(uspi);
+	usb2 = ubh_get_usb_second(uspi);
+	usb3 = ubh_get_usb_third(uspi);
+
+	if ((mtype == UFS_MOUNT_UFSTYPE_44BSD &&
+	     (usb1->fs_flags & UFS_FLAGS_UPDATED)) ||
+	    mtype == UFS_MOUNT_UFSTYPE_UFS2) {
+		/*we have statistic in different place, then usual*/
+		uspi->cs_total.cs_ndir = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir);
+		uspi->cs_total.cs_nbfree = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree);
+		uspi->cs_total.cs_nifree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree);
+		uspi->cs_total.cs_nffree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree);
+	} else {
+		uspi->cs_total.cs_ndir = fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir);
+		uspi->cs_total.cs_nbfree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree);
+		uspi->cs_total.cs_nifree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree);
+		uspi->cs_total.cs_nffree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree);
+	}
+	UFSD("EXIT\n");
+}
+
+/*
+ * Read on-disk structures associated with cylinder groups
+ */
+static int ufs_read_cylinder_structures(struct super_block *sb)
+{
+	struct ufs_sb_info *sbi = UFS_SB(sb);
+	struct ufs_sb_private_info *uspi = sbi->s_uspi;
+	unsigned flags = sbi->s_flags;
 	struct ufs_buffer_head * ubh;
 	unsigned char * base, * space;
 	unsigned size, blks, i;
-	unsigned flags = 0;
-	
+	struct ufs_super_block_third *usb3;
+
 	UFSD("ENTER\n");
-	
-	usb3 = ubh_get_usb_third(uspi);
 
-        flags = UFS_SB(sb)->s_flags;
-	
+	usb3 = ubh_get_usb_third(uspi);
 	/*
 	 * Read cs structures from (usually) first data block
 	 * on the device. 
@@ -475,21 +508,64 @@ failed:
 }
 
 /*
- * Put on-disk structures associated with cylinder groups and 
- * write them back to disk
+ * Sync our internal copy of fs_cstotal with disk
  */
-static void ufs_put_cylinder_structures (struct super_block *sb)
+static void ufs_put_cstotal(struct super_block *sb)
 {
-	struct ufs_sb_info * sbi = UFS_SB(sb);
-	struct ufs_sb_private_info * uspi;
+	unsigned mtype = UFS_SB(sb)->s_mount_opt & UFS_MOUNT_UFSTYPE;
+	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+	struct ufs_super_block_first *usb1;
+	struct ufs_super_block_second *usb2;
+	struct ufs_super_block_third *usb3;
+
+	UFSD("ENTER\n");
+	usb1 = ubh_get_usb_first(uspi);
+	usb2 = ubh_get_usb_second(uspi);
+	usb3 = ubh_get_usb_third(uspi);
+
+	if ((mtype == UFS_MOUNT_UFSTYPE_44BSD &&
+	     (usb1->fs_flags & UFS_FLAGS_UPDATED)) ||
+	    mtype == UFS_MOUNT_UFSTYPE_UFS2) {
+		/*we have statistic in different place, then usual*/
+		usb2->fs_un.fs_u2.cs_ndir =
+			cpu_to_fs64(sb, uspi->cs_total.cs_ndir);
+		usb2->fs_un.fs_u2.cs_nbfree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nbfree);
+		usb3->fs_un1.fs_u2.cs_nifree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nifree);
+		usb3->fs_un1.fs_u2.cs_nffree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nffree);
+	} else {
+		usb1->fs_cstotal.cs_ndir =
+			cpu_to_fs32(sb, uspi->cs_total.cs_ndir);
+		usb1->fs_cstotal.cs_nbfree =
+			cpu_to_fs32(sb, uspi->cs_total.cs_nbfree);
+		usb1->fs_cstotal.cs_nifree =
+			cpu_to_fs32(sb, uspi->cs_total.cs_nifree);
+		usb1->fs_cstotal.cs_nffree =
+			cpu_to_fs32(sb, uspi->cs_total.cs_nffree);
+	}
+	ubh_mark_buffer_dirty(USPI_UBH(uspi));
+	UFSD("EXIT\n");
+}
+
+/**
+ * ufs_put_super_internal() - put on-disk intrenal structures
+ * @sb: pointer to super_block structure
+ * Put on-disk structures associated with cylinder groups
+ * and write them back to disk, also update cs_total on disk
+ */
+static void ufs_put_super_internal(struct super_block *sb)
+{
+	struct ufs_sb_info *sbi = UFS_SB(sb);
+	struct ufs_sb_private_info *uspi = sbi->s_uspi;
 	struct ufs_buffer_head * ubh;
 	unsigned char * base, * space;
 	unsigned blks, size, i;
+
 	
 	UFSD("ENTER\n");
-	
-	uspi = sbi->s_uspi;
-
+	ufs_put_cstotal(sb);
 	size = uspi->s_cssize;
 	blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
 	base = space = (char*) sbi->s_csp;
@@ -524,7 +600,6 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 	struct ufs_super_block_first * usb1;
 	struct ufs_super_block_second * usb2;
 	struct ufs_super_block_third * usb3;
-	struct ufs_super_block *usb;
 	struct ufs_buffer_head * ubh;	
 	struct inode *inode;
 	unsigned block_size, super_block_size;
@@ -728,8 +803,6 @@ again:
 	usb1 = ubh_get_usb_first(uspi);
 	usb2 = ubh_get_usb_second(uspi);
 	usb3 = ubh_get_usb_third(uspi);
-	usb  = (struct ufs_super_block *)
-		((struct ufs_buffer_head *)uspi)->bh[0]->b_data ;
 
 	/*
 	 * Check ufs magic number
@@ -850,8 +923,7 @@ magic_found:
 			sb->s_flags |= MS_RDONLY;
 			break;
 		}
-	}
-	else {
+	} else {
 		printk("ufs_read_super: fs needs fsck\n");
 		sb->s_flags |= MS_RDONLY;
 	}
@@ -952,7 +1024,7 @@ magic_found:
 	if (!sb->s_root)
 		goto dalloc_failed;
 
-
+	ufs_setup_cstotal(sb);
 	/*
 	 * Read cylinder group structures
 	 */
@@ -1000,7 +1072,7 @@ 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(uspi));
+		ufs_put_cstotal(sb);
 	}
 	sb->s_dirt = 0;
 	UFSD("EXIT\n");
@@ -1014,7 +1086,7 @@ static void ufs_put_super(struct super_block *sb)
 	UFSD("ENTER\n");
 
 	if (!(sb->s_flags & MS_RDONLY))
-		ufs_put_cylinder_structures (sb);
+		ufs_put_super_internal(sb);
 	
 	ubh_brelse_uspi (sbi->s_uspi);
 	kfree (sbi->s_uspi);
@@ -1049,8 +1121,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 		return -EINVAL;
 	if (!(new_mount_opt & UFS_MOUNT_UFSTYPE)) {
 		new_mount_opt |= ufstype;
-	}
-	else if ((new_mount_opt & UFS_MOUNT_UFSTYPE) != ufstype) {
+	} else if ((new_mount_opt & UFS_MOUNT_UFSTYPE) != ufstype) {
 		printk("ufstype can't be changed during remount\n");
 		return -EINVAL;
 	}
@@ -1064,7 +1135,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 	 * fs was mouted as rw, remounting ro
 	 */
 	if (*mount_flags & MS_RDONLY) {
-		ufs_put_cylinder_structures(sb);
+		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_SUNx86) 
@@ -1073,11 +1144,10 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 		ubh_mark_buffer_dirty (USPI_UBH(uspi));
 		sb->s_dirt = 0;
 		sb->s_flags |= MS_RDONLY;
-	}
+	} else {
 	/*
 	 * fs was mounted as ro, remounting rw
 	 */
-	else {
 #ifndef CONFIG_UFS_FS_WRITE
 		printk("ufs was compiled with read-only support, "
 		"can't be mounted as read-write\n");
@@ -1089,7 +1159,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 			printk("this ufstype is read-only supported\n");
 			return -EINVAL;
 		}
-		if (!ufs_read_cylinder_structures (sb)) {
+		if (!ufs_read_cylinder_structures(sb)) {
 			printk("failed during remounting\n");
 			return -EPERM;
 		}
@@ -1118,17 +1188,13 @@ static int ufs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 		buf->f_type = UFS2_MAGIC;
 		buf->f_blocks = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize);
-		buf->f_bfree = ufs_blkstofrags(
-			fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree)) +
-			fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree);
-		buf->f_ffree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree);
 	} else {
 		buf->f_type = UFS_MAGIC;
 		buf->f_blocks = uspi->s_dsize;
-		buf->f_bfree = ufs_blkstofrags(fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree)) +
-			fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree);
-		buf->f_ffree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree);
 	}
+	buf->f_bfree = ufs_blkstofrags(uspi->cs_total.cs_nbfree) +
+		uspi->cs_total.cs_nffree;
+	buf->f_ffree = uspi->cs_total.cs_nifree;
 	buf->f_bsize = sb->s_blocksize;
 	buf->f_bavail = (buf->f_bfree > (((long)buf->f_blocks / 100) * uspi->s_minfree))
 		? (buf->f_bfree - (((long)buf->f_blocks / 100) * uspi->s_minfree)) : 0;