configfs: kill configfs_sb

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

5 files changed, 26 insertions, 25 deletions

diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index 1b7fdc0a6a09..37121c2be110 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -63,7 +63,7 @@ extern struct kmem_cache *configfs_dir_cachep;
 
 extern int configfs_is_root(struct config_item *item);
 
-extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *);
+extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
 extern int configfs_create(struct dentry *, umode_t mode, int (*init)(struct inode *));
 extern int configfs_inode_init(void);
 extern void configfs_inode_exit(void);
@@ -84,7 +84,6 @@ extern int configfs_pin_fs(void);
 extern void configfs_release_fs(void);
 
 extern struct rw_semaphore configfs_rename_sem;
-extern struct super_block * configfs_sb;
 extern const struct file_operations configfs_dir_operations;
 extern const struct file_operations configfs_file_operations;
 extern const struct file_operations bin_fops;
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index b0fbcbeb03ee..54c59a7e37ce 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1079,6 +1079,7 @@ int configfs_depend_item(struct configfs_subsystem *subsys,
         int ret;
         struct configfs_dirent *p, *root_sd, *subsys_sd = NULL;
         struct config_item *s_item = &subsys->su_group.cg_item;
+        struct dentry *root;
 
         /*
          * Pin the configfs filesystem.  This means we can safely access
@@ -1093,9 +1094,10 @@ int configfs_depend_item(struct configfs_subsystem *subsys,
          * subsystem is really registered, and so we need to lock out
          * configfs_[un]register_subsystem().
          */
-        mutex_lock(&configfs_sb->s_root->d_inode->i_mutex);
+        root = configfs_mount->mnt_root;
+        mutex_lock(&root->d_inode->i_mutex);
 
-        root_sd = configfs_sb->s_root->d_fsdata;
+        root_sd = root->d_fsdata;
 
         list_for_each_entry(p, &root_sd->s_children, s_sibling) {
                 if (p->s_type & CONFIGFS_DIR) {
@@ -1129,7 +1131,7 @@ int configfs_depend_item(struct configfs_subsystem *subsys,
 out_unlock_dirent_lock:
         spin_unlock(&configfs_dirent_lock);
 out_unlock_fs:
-        mutex_unlock(&configfs_sb->s_root->d_inode->i_mutex);
+        mutex_unlock(&root->d_inode->i_mutex);
 
         /*
          * If we succeeded, the fs is pinned via other methods.  If not,
@@ -1543,6 +1545,7 @@ static inline unsigned char dt_type(struct configfs_dirent *sd)
 static int configfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 {
         struct dentry *dentry = filp->f_path.dentry;
+        struct super_block *sb = dentry->d_sb;
         struct configfs_dirent * parent_sd = dentry->d_fsdata;
         struct configfs_dirent *cursor = filp->private_data;
         struct list_head *p, *q = &cursor->s_sibling;
@@ -1605,7 +1608,7 @@ static int configfs_readdir(struct file * filp, void * dirent, filldir_t filldir
                                         ino = inode->i_ino;
                                 spin_unlock(&configfs_dirent_lock);
                                 if (!inode)
-                                        ino = iunique(configfs_sb, 2);
+                                        ino = iunique(sb, 2);
 
                                 if (filldir(dirent, name, len, filp->f_pos, ino,
                                                  dt_type(next)) < 0)
@@ -1677,6 +1680,7 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
         struct config_group *group = &subsys->su_group;
         struct qstr name;
         struct dentry *dentry;
+        struct dentry *root;
         struct configfs_dirent *sd;
 
         err = configfs_pin_fs();
@@ -1686,18 +1690,18 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
         if (!group->cg_item.ci_name)
                 group->cg_item.ci_name = group->cg_item.ci_namebuf;
 
-        sd = configfs_sb->s_root->d_fsdata;
+        root = configfs_mount->mnt_root;
+        sd = root->d_fsdata;
         link_group(to_config_group(sd->s_element), group);
 
-        mutex_lock_nested(&configfs_sb->s_root->d_inode->i_mutex,
-                        I_MUTEX_PARENT);
+        mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);
 
         name.name = group->cg_item.ci_name;
         name.len = strlen(name.name);
         name.hash = full_name_hash(name.name, name.len);
 
         err = -ENOMEM;
-        dentry = d_alloc(configfs_sb->s_root, &name);
+        dentry = d_alloc(root, &name);
         if (dentry) {
                 d_add(dentry, NULL);
 
@@ -1714,7 +1718,7 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
                 }
         }
 
-        mutex_unlock(&configfs_sb->s_root->d_inode->i_mutex);
+        mutex_unlock(&root->d_inode->i_mutex);
 
         if (err) {
                 unlink_group(group);
@@ -1728,13 +1732,14 @@ void configfs_unregister_subsystem(struct configfs_subsystem *subsys)
 {
         struct config_group *group = &subsys->su_group;
         struct dentry *dentry = group->cg_item.ci_dentry;
+        struct dentry *root = dentry->d_sb->s_root;
 
-        if (dentry->d_parent != configfs_sb->s_root) {
+        if (dentry->d_parent != root) {
                 printk(KERN_ERR "configfs: Tried to unregister non-subsystem!\n");
                 return;
         }
 
-        mutex_lock_nested(&configfs_sb->s_root->d_inode->i_mutex,
+        mutex_lock_nested(&root->d_inode->i_mutex,
                           I_MUTEX_PARENT);
         mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD);
         mutex_lock(&configfs_symlink_mutex);
@@ -1751,7 +1756,7 @@ void configfs_unregister_subsystem(struct configfs_subsystem *subsys)
 
         d_delete(dentry);
 
-        mutex_unlock(&configfs_sb->s_root->d_inode->i_mutex);
+        mutex_unlock(&root->d_inode->i_mutex);
 
         dput(dentry);
 
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index 3ee36d418863..8cf21ef902fc 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -44,8 +44,6 @@
 static struct lock_class_key default_group_class[MAX_LOCK_DEPTH];
 #endif
 
-extern struct super_block * configfs_sb;
-
 static const struct address_space_operations configfs_aops = {
         .readpage       = simple_readpage,
         .write_begin    = simple_write_begin,
@@ -132,9 +130,10 @@ static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
         inode->i_ctime = iattr->ia_ctime;
 }
 
-struct inode *configfs_new_inode(umode_t mode, struct configfs_dirent * sd)
+struct inode *configfs_new_inode(umode_t mode, struct configfs_dirent *sd,
+                                 struct super_block *s)
 {
-        struct inode * inode = new_inode(configfs_sb);
+        struct inode * inode = new_inode(s);
         if (inode) {
                 inode->i_ino = get_next_ino();
                 inode->i_mapping->a_ops = &configfs_aops;
@@ -192,7 +191,7 @@ int configfs_create(struct dentry * dentry, umode_t mode, int (*init)(struct ino
         if (dentry) {
                 if (!dentry->d_inode) {
                         struct configfs_dirent *sd = dentry->d_fsdata;
-                        if ((inode = configfs_new_inode(mode, sd))) {
+                        if ((inode = configfs_new_inode(mode, sd, dentry->d_sb))) {
                                 if (dentry->d_parent && dentry->d_parent->d_inode) {
                                         struct inode *p_inode = dentry->d_parent->d_inode;
                                         p_inode->i_mtime = p_inode->i_ctime = CURRENT_TIME;
diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c
index eb41adc28cfe..cc829fc85d77 100644
--- a/fs/configfs/mount.c
+++ b/fs/configfs/mount.c
@@ -38,7 +38,6 @@
 #define CONFIGFS_MAGIC 0x62656570
 
 struct vfsmount * configfs_mount = NULL;
-struct super_block * configfs_sb = NULL;
 struct kmem_cache *configfs_dir_cachep;
 static int configfs_mnt_count = 0;
 
@@ -77,10 +76,9 @@ static int configfs_fill_super(struct super_block *sb, void *data, int silent)
         sb->s_magic = CONFIGFS_MAGIC;
         sb->s_op = &configfs_ops;
         sb->s_time_gran = 1;
-        configfs_sb = sb;
 
         inode = configfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
-                                   &configfs_root);
+                                   &configfs_root, sb);
         if (inode) {
                 inode->i_op = &configfs_root_inode_operations;
                 inode->i_fop = &configfs_dir_operations;
diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index 2817153d33c2..cc9f2546ea4a 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -110,13 +110,13 @@ out:
 
 
 static int get_target(const char *symname, struct path *path,
-                      struct config_item **target)
+                      struct config_item **target, struct super_block *sb)
 {
         int ret;
 
         ret = kern_path(symname, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, path);
         if (!ret) {
-                if (path->dentry->d_sb == configfs_sb) {
+                if (path->dentry->d_sb == sb) {
                         *target = configfs_get_config_item(path->dentry);
                         if (!*target) {
                                 ret = -ENOENT;
@@ -158,7 +158,7 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna
             !type->ct_item_ops->allow_link)
                 goto out_put;
 
-        ret = get_target(symname, &path, &target_item);
+        ret = get_target(symname, &path, &target_item, dentry->d_sb);
         if (ret)
                 goto out_put;