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[DLM] Don't delete misc device if lockspace removal fails

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Currently if the lockspace removal fails the misc device associated with a
lockspace is left deleted. After that there is no way to access the orphaned
lockspace from userland.

This patch recreates the misc device if th dlm_release_lockspace fails. I
believe this is better than attempting to remove the lockspace first because
that leaves an unattached device lying around. The potential gap in which there
is no access to the lockspace between removing the misc device and recreating it
is acceptable ... after all the application is trying to remove it, and only new
users of the lockspace will be affected.

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Patrick Caulfield 2007-03-21 09:23:53 +00:00 committed by Steven Whitehouse
parent 420d2a1028
commit 254da030df
1 changed files with 36 additions and 22 deletions
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58
fs/dlm/user.c
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@ -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;
}