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switch create_mnt_ns() to saner calling conventions, fix double mntput() in nfs 

Life is much saner if create_mnt_ns(mnt) drops mnt in case of error...
Switch it to such calling conventions, switch callers, fix double mntput() in
fs/nfs/super.c one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-16 16:12:14 -05:00
parent 8d514bbf37
commit c133449587
3 changed files with 11 additions and 18 deletions
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4
fs/btrfs/super.c
View File

@ -843,10 +843,8 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags,
return ERR_CAST(mnt);
ns_private = create_mnt_ns(mnt);
if (IS_ERR(ns_private)) {
mntput(mnt);
if (IS_ERR(ns_private))
return ERR_CAST(ns_private);
}
/*
* This will trigger the automount of the subvol so we can just

2
fs/namespace.c
View File

@ -2483,6 +2483,8 @@ struct mnt_namespace *create_mnt_ns(struct vfsmount *mnt)
__mnt_make_longterm(mnt);
new_ns->root = mnt;
list_add(&new_ns->list, &new_ns->root->mnt_list);
} else {
mntput(mnt);
}
return new_ns;
}

23
fs/nfs/super.c
View File

@ -2794,22 +2794,21 @@ static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
int ret;
ns_private = create_mnt_ns(root_mnt);
ret = PTR_ERR(ns_private);
if (IS_ERR(ns_private))
goto out_mntput;
return ERR_CAST(ns_private);
ret = nfs_referral_loop_protect();
if (ret != 0)
goto out_put_mnt_ns;
if (ret == 0) {
ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
export_path, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT,
&path);
nfs_referral_loop_unprotect();
}
ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
export_path, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
nfs_referral_loop_unprotect();
put_mnt_ns(ns_private);
if (ret != 0)
goto out_err;
return ERR_PTR(ret);
s = path.mnt->mnt_sb;
atomic_inc(&s->s_active);
@ -2818,12 +2817,6 @@ static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
path_put(&path);
down_write(&s->s_umount);
return dentry;
out_put_mnt_ns:
put_mnt_ns(ns_private);
out_mntput:
mntput(root_mnt);
out_err:
return ERR_PTR(ret);
}
static struct dentry *nfs4_try_mount(int flags, const char *dev_name,