diff options
| -rw-r--r-- | fs/dlm/user.c | 58 |
1 files changed, 36 insertions, 22 deletions
diff --git a/fs/dlm/user.c b/fs/dlm/user.c index 3870150b83a4..27a75ce571cf 100644 --- a/fs/dlm/user.c +++ b/fs/dlm/user.c @@ -286,11 +286,34 @@ static int device_user_unlock(struct dlm_user_proc *proc, return error; } +static int create_misc_device(struct dlm_ls *ls, char *name) +{ + int error, len; + + error = -ENOMEM; + len = strlen(name) + strlen(name_prefix) + 2; + ls->ls_device.name = kzalloc(len, GFP_KERNEL); + if (!ls->ls_device.name) + goto fail; + + snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, + name); + ls->ls_device.fops = &device_fops; + ls->ls_device.minor = MISC_DYNAMIC_MINOR; + + error = misc_register(&ls->ls_device); + if (error) { + kfree(ls->ls_device.name); + } +fail: + return error; +} + static int device_create_lockspace(struct dlm_lspace_params *params) { dlm_lockspace_t *lockspace; struct dlm_ls *ls; - int error, len; + int error; if (!capable(CAP_SYS_ADMIN)) return -EPERM; @@ -304,29 +327,14 @@ static int device_create_lockspace(struct dlm_lspace_params *params) if (!ls) return -ENOENT; - error = -ENOMEM; - len = strlen(params->name) + strlen(name_prefix) + 2; - ls->ls_device.name = kzalloc(len, GFP_KERNEL); - if (!ls->ls_device.name) - goto fail; - snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, - params->name); - ls->ls_device.fops = &device_fops; - ls->ls_device.minor = MISC_DYNAMIC_MINOR; - - error = misc_register(&ls->ls_device); - if (error) { - kfree(ls->ls_device.name); - goto fail; - } - - error = ls->ls_device.minor; + error = create_misc_device(ls, params->name); dlm_put_lockspace(ls); - return error; - fail: - dlm_put_lockspace(ls); - dlm_release_lockspace(lockspace, 0); + if (error) + dlm_release_lockspace(lockspace, 0); + else + error = ls->ls_device.minor; + return error; } @@ -343,6 +351,10 @@ static int device_remove_lockspace(struct dlm_lspace_params *params) if (!ls) return -ENOENT; + /* Deregister the misc device first, so we don't have + * a device that's not attached to a lockspace. If + * dlm_release_lockspace fails then we can recreate it + */ error = misc_deregister(&ls->ls_device); if (error) { dlm_put_lockspace(ls); @@ -361,6 +373,8 @@ static int device_remove_lockspace(struct dlm_lspace_params *params) dlm_put_lockspace(ls); error = dlm_release_lockspace(lockspace, force); + if (error) + create_misc_device(ls, ls->ls_name); out: return error; } |