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>

diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 9bd2ce2..bca8e2a 100644 (file)
--- a/fs/logfs/dev_bdev.c
+++ b/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);
 }

diff --git a/fs/logfs/dev_mtd.c b/fs/logfs/dev_mtd.c
index a85d47d..e886cdc 100644 (file)
--- a/fs/logfs/dev_mtd.c
+++ b/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);
 }

diff --git a/fs/logfs/logfs.h b/fs/logfs/logfs.h
index b878626..a3f0aba 100644 (file)
--- a/fs/logfs/logfs.h
+++ b/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);

diff --git a/fs/logfs/super.c b/fs/logfs/super.c
index 5336155..5e43178 100644 (file)
--- a/fs/logfs/super.c
+++ b/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 = {