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make configfs_pin_fs() return root dentry on success

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... and make configfs_mnt static

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-03-17 16:53:29 -04:00
parent 0dd6c08a00
commit 2a152ad3a5
3 changed files with 11 additions and 13 deletions
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3
fs/configfs/configfs_internal.h
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@ -58,7 +58,6 @@ struct configfs_dirent {
extern struct mutex configfs_symlink_mutex;
extern spinlock_t configfs_dirent_lock;
extern struct vfsmount * configfs_mount;
extern struct kmem_cache *configfs_dir_cachep;
extern int configfs_is_root(struct config_item *item);
@ -80,7 +79,7 @@ extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
extern int configfs_pin_fs(void);
extern struct dentry *configfs_pin_fs(void);
extern void configfs_release_fs(void);
extern struct rw_semaphore configfs_rename_sem;

14
fs/configfs/dir.c
View File

@ -1075,16 +1075,15 @@ int configfs_depend_item(struct configfs_subsystem *subsys,
* Pin the configfs filesystem. This means we can safely access
* the root of the configfs filesystem.
*/
ret = configfs_pin_fs();
if (ret)
return ret;
root = configfs_pin_fs();
if (IS_ERR(root))
return PTR_ERR(root);
/*
* Next, lock the root directory. We're going to check that the
* subsystem is really registered, and so we need to lock out
* configfs_[un]register_subsystem().
*/
root = configfs_mount->mnt_root;
mutex_lock(&root->d_inode->i_mutex);
root_sd = root->d_fsdata;
@ -1673,14 +1672,13 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
struct dentry *root;
struct configfs_dirent *sd;
err = configfs_pin_fs();
if (err)
return err;
root = configfs_pin_fs();
if (IS_ERR(root))
return PTR_ERR(root);
if (!group->cg_item.ci_name)
group->cg_item.ci_name = group->cg_item.ci_namebuf;
root = configfs_mount->mnt_root;
sd = root->d_fsdata;
link_group(to_config_group(sd->s_element), group);

7
fs/configfs/mount.c
View File

@ -37,7 +37,7 @@
/* Random magic number */
#define CONFIGFS_MAGIC 0x62656570
struct vfsmount * configfs_mount = NULL;
static struct vfsmount *configfs_mount = NULL;
struct kmem_cache *configfs_dir_cachep;
static int configfs_mnt_count = 0;
@ -115,10 +115,11 @@ static struct file_system_type configfs_fs_type = {
.kill_sb = kill_litter_super,
};
int configfs_pin_fs(void)
struct dentry *configfs_pin_fs(void)
{
return simple_pin_fs(&configfs_fs_type, &configfs_mount,
int err = simple_pin_fs(&configfs_fs_type, &configfs_mount,
&configfs_mnt_count);
return err ? ERR_PTR(err) : configfs_mount->mnt_root;
}
void configfs_release_fs(void)