[PATCH] (4/4) ->kill_sb() switchover

bdev filesystems switched.  Changes documented in Locking and porting.

Documentation/filesystems/Locking

@@ -121,10 +121,16 @@ by better scheme anyway.
 
 --------------------------- file_system_type ---------------------------
 prototypes:
-	struct super_block *(*read_super) (struct super_block *, void *, int);
+	struct super_block *(*get_sb) (struct file_system_type *, int, char *, void *);
+	void (*kill_sb) (struct super_block *);
 locking rules:
-may block	BKL	->s_lock	mount_sem
-yes		yes	yes		maybe
+		may block	BKL
+get_sb		yes		yes
+kill_sb		yes		yes
+
+->get_sb() returns error or a locked superblock (exclusive on ->s_umount).
+->kill_sb() takes a locked superblock, does all shutdown work on it,
+unlocks and drops the reference.
 
 --------------------------- address_space_operations --------------------------
 prototypes:

Documentation/filesystems/porting

@@ -99,3 +99,20 @@ free to drop it...
 
 ->link() callers hold ->i_sem on the object we are linking to.  Some of your
 problems might be over...
+
+---
+[mandatory]
+
+new file_system_type method - kill_sb(superblock).  If you are converting
+an existing filesystem, set it according to ->fs_flags:
+	FS_REQUIRES_DEV		-	kill_block_super
+	FS_LITTER		-	kill_litter_super
+	neither			-	kill_anon_super
+FS_LITTER is gone - just remove it from fs_flags.
+
+---
+[mandatory]
+
+	FS_SINGLE is gone (actually, that had happened back when ->get_sb()
+went in - and hadn't been documented ;-/).  Just remove it from fs_flags
+(and see ->get_sb() entry for other actions).

fs/adfs/super.c

@@ -485,6 +485,7 @@ static struct file_system_type adfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"adfs",
 	get_sb:		adfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/affs/super.c

@@ -536,6 +536,7 @@ static struct file_system_type affs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"affs",
 	get_sb:		affs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/bfs/inode.c

@@ -371,6 +371,7 @@ static struct file_system_type bfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"bfs",
 	get_sb:		bfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/cramfs/inode.c

@@ -458,6 +458,7 @@ static struct file_system_type cramfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"cramfs",
 	get_sb:		cramfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/efs/super.c

@@ -24,6 +24,7 @@ static struct file_system_type efs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"efs",
 	get_sb:		efs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/ext2/super.c

@@ -853,6 +853,7 @@ static struct file_system_type ext2_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"ext2",
 	get_sb:		ext2_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/ext3/super.c

@@ -1778,6 +1778,7 @@ static struct file_system_type ext3_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"ext3",
 	get_sb:		ext3_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/freevxfs/vxfs_super.c

@@ -237,6 +237,7 @@ static struct file_system_type vxfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"vxfs",
 	get_sb:		vxfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/hfs/super.c

@@ -105,6 +105,7 @@ static struct file_system_type hfs_fs = {
 	owner:		THIS_MODULE,
 	name:		"hfs",
 	get_sb:		hfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/hpfs/super.c

@@ -619,6 +619,7 @@ static struct file_system_type hpfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"hpfs",
 	get_sb:		hpfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/isofs/inode.c

@@ -1404,6 +1404,7 @@ static struct file_system_type iso9660_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"iso9660",
 	get_sb:		isofs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/jffs/inode-v23.c

@@ -1763,6 +1763,7 @@ static struct file_system_type jffs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"jffs",
 	get_sb:		jffs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/jffs2/super.c

@@ -356,6 +356,7 @@ static struct file_system_type jffs2_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"jffs2",
 	get_sb:		jffs2_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/jfs/super.c

@@ -364,6 +364,7 @@ static struct file_system_type jfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"jfs",
 	get_sb:		jfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/minix/inode.c

@@ -567,6 +567,7 @@ static struct file_system_type minix_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"minix",
 	get_sb:		minix_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/msdos/msdosfs_syms.c

@@ -35,6 +35,7 @@ static struct file_system_type msdos_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"msdos",
 	get_sb:		msdos_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/ntfs/fs.c

@@ -1168,6 +1168,7 @@ static struct file_system_type ntfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"ntfs",
 	get_sb:		ntfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/qnx4/inode.c

@@ -549,6 +549,7 @@ static struct file_system_type qnx4_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"qnx4",
 	get_sb:		qnx4_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/reiserfs/super.c

@@ -1193,6 +1193,7 @@ static struct file_system_type reiserfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"reiserfs",
 	get_sb:		reiserfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/romfs/inode.c

@@ -540,6 +540,7 @@ static struct file_system_type romfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"romfs",
 	get_sb:		romfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/super.c

@@ -432,16 +432,6 @@ static void generic_shutdown_super(struct super_block *sb)
 	remove_super(sb);
 }
 
-static void shutdown_super(struct super_block *sb)
-{
-	struct file_system_type *fs = sb->s_type;
-	struct block_device *bdev = sb->s_bdev;
-
-	generic_shutdown_super(sb);
-	bd_release(bdev);
-	blkdev_put(bdev, BDEV_FS);
-}
-
 void kill_super(struct super_block *sb)
 {
 	struct file_system_type *fs = sb->s_type;
@@ -450,10 +440,7 @@ void kill_super(struct super_block *sb)
 		return;
 
 	down_write(&sb->s_umount);
-	if (fs->kill_sb)
-		fs->kill_sb(sb);
-	else
-		shutdown_super(sb);
+	fs->kill_sb(sb);
 	put_filesystem(fs);
 }
 

fs/sysv/super.c

@@ -490,6 +490,7 @@ static struct file_system_type sysv_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"sysv",
 	get_sb:		sysv_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 
@@ -497,6 +498,7 @@ static struct file_system_type v7_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"v7",
 	get_sb:		v7_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/udf/super.c

@@ -106,6 +106,7 @@ static struct file_system_type udf_fstype = {
 	owner:		THIS_MODULE,
 	name:		"udf",
 	get_sb:		udf_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/ufs/super.c

@@ -1018,6 +1018,7 @@ static struct file_system_type ufs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"ufs",
 	get_sb:		ufs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };
 

fs/vfat/vfatfs_syms.c

@@ -21,6 +21,7 @@ static struct file_system_type vfat_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"vfat",
 	get_sb:		vfat_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };