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nfsd4: fix v4 state shutdown error paths 

If someone tries to shut down the laundry_wq while it isn't up it'll
cause an oops.

This can happen because write_ports can create a nfsd_svc before we
really start the nfs server, and we may fail before the server is ever
started.

Also make sure state is shutdown on error paths in nfsd_svc().

Use a common global nfsd_up flag instead of nfs4_init, and create common
helper functions for nfsd start/shutdown, as there will be other work
that we want done only when we the number of nfsd threads transitions
between zero and nonzero.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2010-07-19 16:50:04 -04:00 committed by J. Bruce Fields
parent 55b13354d7
commit 4ad9a344be
2 changed files with 43 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/nfsd/nfs4state.c
View File

@ -51,7 +51,6 @@ static time_t boot_time;
static u32 current_ownerid = 1;
static u32 current_fileid = 1;
static u32 current_delegid = 1;
static u32 nfs4_init;
static stateid_t zerostateid; /* bits all 0 */
static stateid_t onestateid; /* bits all 1 */
static u64 current_sessionid = 1;
@ -4071,16 +4070,8 @@ out_free_laundry:
int
nfs4_state_start(void)
{
int ret;
if (nfs4_init)
return 0;
nfsd4_load_reboot_recovery_data();
ret = __nfs4_state_start();
if (ret)
return ret;
nfs4_init = 1;
return 0;
return __nfs4_state_start();
}
static void
@ -4115,7 +4106,6 @@ __nfs4_state_shutdown(void)
}
nfsd4_shutdown_recdir();
nfs4_init = 0;
}
void

51
fs/nfsd/nfssvc.c
View File

@ -180,6 +180,31 @@ int nfsd_nrthreads(void)
return rv;
}
static bool nfsd_up = false;
static int nfsd_startup(unsigned short port, int nrservs)
{
int ret;
ret = nfs4_state_start();
nfsd_up = true;
return ret;
}
static void nfsd_shutdown(void)
{
/*
* write_ports can create the server without actually starting
* any threads--if we get shut down before any threads are
* started, then nfsd_last_thread will be run before any of this
* other initialization has been done.
*/
if (!nfsd_up)
return;
nfs4_state_shutdown();
nfsd_up = false;
}
static void nfsd_last_thread(struct svc_serv *serv)
{
/* When last nfsd thread exits we need to do some clean-up */
@ -188,7 +213,7 @@ static void nfsd_last_thread(struct svc_serv *serv)
lockd_down();
nfsd_serv = NULL;
nfsd_racache_shutdown();
nfs4_state_shutdown();
nfsd_shutdown();
printk(KERN_WARNING "nfsd: last server has exited, flushing export "
"cache\n");
@ -380,6 +405,7 @@ int
nfsd_svc(unsigned short port, int nrservs)
{
int error;
bool first_thread;
mutex_lock(&nfsd_mutex);
dprintk("nfsd: creating service\n");
@ -395,19 +421,23 @@ nfsd_svc(unsigned short port, int nrservs)
error = nfsd_racache_init(2*nrservs);
if (error<0)
goto out;
error = nfs4_state_start();
if (error)
goto out;
first_thread = (nfsd_serv->sv_nrthreads == 0) && (nrservs != 0);
if (first_thread) {
error = nfsd_startup(port, nrservs);
if (error)
goto out;
}
nfsd_reset_versions();
error = nfsd_create_serv();
if (error)
goto out;
goto out_shutdown;
error = nfsd_init_socks(port);
if (error)
goto failure;
goto out_destroy;
error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
if (error == 0)
@ -416,9 +446,12 @@ nfsd_svc(unsigned short port, int nrservs)
* so subtract 1
*/
error = nfsd_serv->sv_nrthreads - 1;
failure:
out_destroy:
svc_destroy(nfsd_serv); /* Release server */
out:
out_shutdown:
if (error < 0 && first_thread)
nfsd_shutdown();
out:
mutex_unlock(&nfsd_mutex);
return error;
}