logfs get_sb massage, part 1

move allocation of logfs_super to logfs_get_sb, pass it to
logfs_get_sb_...().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/logfs/dev_bdev.c

@@ -9,6 +9,7 @@
 #include <linux/bio.h>
 #include <linux/blkdev.h>
 #include <linux/buffer_head.h>
+#include <linux/slab.h>
 #include <linux/gfp.h>
 
 #define PAGE_OFS(ofs) ((ofs) & (PAGE_SIZE-1))
@@ -320,20 +321,23 @@ static const struct logfs_device_ops bd_devops = {
 	.put_device	= bdev_put_device,
 };
 
-int logfs_get_sb_bdev(struct file_system_type *type, int flags,
+int logfs_get_sb_bdev(struct logfs_super *p,
+		struct file_system_type *type, int flags,
 		const char *devname, struct vfsmount *mnt)
 {
 	struct block_device *bdev;
 
 	bdev = open_bdev_exclusive(devname, FMODE_READ|FMODE_WRITE, type);
-	if (IS_ERR(bdev))
+	if (IS_ERR(bdev)) {
+		kfree(p);
 		return PTR_ERR(bdev);
+	}
 
 	if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
 		int mtdnr = MINOR(bdev->bd_dev);
 		close_bdev_exclusive(bdev, FMODE_READ|FMODE_WRITE);
-		return logfs_get_sb_mtd(type, flags, mtdnr, mnt);
+		return logfs_get_sb_mtd(p, type, flags, mtdnr, mnt);
 	}
 
-	return logfs_get_sb_device(type, flags, NULL, bdev, &bd_devops, mnt);
+	return logfs_get_sb_device(p, type, flags, NULL, bdev, &bd_devops, mnt);
 }

fs/logfs/dev_mtd.c

@@ -265,14 +265,17 @@ static const struct logfs_device_ops mtd_devops = {
 	.put_device	= mtd_put_device,
 };
 
-int logfs_get_sb_mtd(struct file_system_type *type, int flags,
+int logfs_get_sb_mtd(struct logfs_super *s,
+		struct file_system_type *type, int flags,
 		int mtdnr, struct vfsmount *mnt)
 {
 	struct mtd_info *mtd;
 	const struct logfs_device_ops *devops = &mtd_devops;
 
 	mtd = get_mtd_device(NULL, mtdnr);
-	if (IS_ERR(mtd))
+	if (IS_ERR(mtd)) {
+		kfree(s);
 		return PTR_ERR(mtd);
-	return logfs_get_sb_device(type, flags, mtd, NULL, devops, mnt);
+	}
+	return logfs_get_sb_device(s, type, flags, mtd, NULL, devops, mnt);
 }

fs/logfs/logfs.h

@@ -471,24 +471,30 @@ void logfs_compr_exit(void);
 
 /* dev_bdev.c */
 #ifdef CONFIG_BLOCK
-int logfs_get_sb_bdev(struct file_system_type *type, int flags,
+int logfs_get_sb_bdev(struct logfs_super *s,
+		struct file_system_type *type, int flags,
 		const char *devname, struct vfsmount *mnt);
 #else
-static inline int logfs_get_sb_bdev(struct file_system_type *type, int flags,
+static inline int logfs_get_sb_bdev(struct logfs_super *s,
+		struct file_system_type *type, int flags,
 		const char *devname, struct vfsmount *mnt)
 {
+	kfree(s);
 	return -ENODEV;
 }
 #endif
 
 /* dev_mtd.c */
 #ifdef CONFIG_MTD
-int logfs_get_sb_mtd(struct file_system_type *type, int flags,
+int logfs_get_sb_mtd(struct logfs_super *s,
+		struct file_system_type *type, int flags,
 		int mtdnr, struct vfsmount *mnt);
 #else
-static inline int logfs_get_sb_mtd(struct file_system_type *type, int flags,
+static inline int logfs_get_sb_mtd(struct logfs_super *s,
+		struct file_system_type *type, int flags,
 		int mtdnr, struct vfsmount *mnt)
 {
+	kfree(s);
 	return -ENODEV;
 }
 #endif
@@ -619,7 +625,8 @@ void emergency_read_end(struct page *page);
 void logfs_crash_dump(struct super_block *sb);
 void *memchr_inv(const void *s, int c, size_t n);
 int logfs_statfs(struct dentry *dentry, struct kstatfs *stats);
-int logfs_get_sb_device(struct file_system_type *type, int flags,
+int logfs_get_sb_device(struct logfs_super *s,
+		struct file_system_type *type, int flags,
 		struct mtd_info *mtd, struct block_device *bdev,
 		const struct logfs_device_ops *devops, struct vfsmount *mnt);
 int logfs_check_ds(struct logfs_disk_super *ds);

fs/logfs/super.c

@@ -536,19 +536,16 @@ static void logfs_kill_sb(struct super_block *sb)
 	log_super("LogFS: Finished unmounting\n");
 }
 
-int logfs_get_sb_device(struct file_system_type *type, int flags,
+int logfs_get_sb_device(struct logfs_super *super,
+		struct file_system_type *type, int flags,
 		struct mtd_info *mtd, struct block_device *bdev,
 		const struct logfs_device_ops *devops, struct vfsmount *mnt)
 {
-	struct logfs_super *super;
 	struct super_block *sb;
 	int err = -ENOMEM;
 	static int mount_count;
 
 	log_super("LogFS: Start mount %x\n", mount_count++);
-	super = kzalloc(sizeof(*super), GFP_KERNEL);
-	if (!super)
-		goto err0;
 
 	super->s_mtd	= mtd;
 	super->s_bdev	= bdev;
@@ -603,20 +600,27 @@ static int logfs_get_sb(struct file_system_type *type, int flags,
 		const char *devname, void *data, struct vfsmount *mnt)
 {
 	ulong mtdnr;
+	struct logfs_super *super;
+
+	super = kzalloc(sizeof(*super), GFP_KERNEL);
+	if (!super)
+		return -ENOMEM;
 
 	if (!devname)
-		return logfs_get_sb_bdev(type, flags, devname, mnt);
+		return logfs_get_sb_bdev(super, type, flags, devname, mnt);
 	if (strncmp(devname, "mtd", 3))
-		return logfs_get_sb_bdev(type, flags, devname, mnt);
+		return logfs_get_sb_bdev(super, type, flags, devname, mnt);
 
 	{
 		char *garbage;
 		mtdnr = simple_strtoul(devname+3, &garbage, 0);
-		if (*garbage)
+		if (*garbage) {
+			kfree(super);
 			return -EINVAL;
+		}
 	}
 
-	return logfs_get_sb_mtd(type, flags, mtdnr, mnt);
+	return logfs_get_sb_mtd(super, type, flags, mtdnr, mnt);
 }
 
 static struct file_system_type logfs_fs_type = {