#include <linux/sunrpc/svc.h>
#include <linux/lockd/lockd.h>
#include <linux/smp_lock.h>
+#include <linux/kthread.h>
#define NLMDBG_FACILITY NLMDBG_CLIENT
struct nlm_host * b_host;
struct file_lock * b_lock; /* local file lock */
unsigned short b_reclaim; /* got to reclaim lock */
- u32 b_status; /* grant callback status */
+ __be32 b_status; /* grant callback status */
};
static LIST_HEAD(nlm_blocked);
+/**
+ * nlmclnt_init - Set up per-NFS mount point lockd data structures
+ * @nlm_init: pointer to arguments structure
+ *
+ * Returns pointer to an appropriate nlm_host struct,
+ * or an ERR_PTR value.
+ */
+struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init)
+{
+ struct nlm_host *host;
+ u32 nlm_version = (nlm_init->nfs_version == 2) ? 1 : 4;
+ int status;
+
+ status = lockd_up();
+ if (status < 0)
+ return ERR_PTR(status);
+
+ host = nlmclnt_lookup_host(nlm_init->address, nlm_init->addrlen,
+ nlm_init->protocol, nlm_version,
+ nlm_init->hostname, nlm_init->noresvport);
+ if (host == NULL) {
+ lockd_down();
+ return ERR_PTR(-ENOLCK);
+ }
+
+ return host;
+}
+EXPORT_SYMBOL_GPL(nlmclnt_init);
+
+/**
+ * nlmclnt_done - Release resources allocated by nlmclnt_init()
+ * @host: nlm_host structure reserved by nlmclnt_init()
+ *
+ */
+void nlmclnt_done(struct nlm_host *host)
+{
+ nlm_release_host(host);
+ lockd_down();
+}
+EXPORT_SYMBOL_GPL(nlmclnt_done);
+
/*
* Queue up a lock for blocking so that the GRANTED request can see it
*/
block->b_host = host;
block->b_lock = fl;
init_waitqueue_head(&block->b_wait);
- block->b_status = NLM_LCK_BLOCKED;
+ block->b_status = nlm_lck_blocked;
list_add(&block->b_list, &nlm_blocked);
}
return block;
* nlmclnt_lock for an explanation.
*/
ret = wait_event_interruptible_timeout(block->b_wait,
- block->b_status != NLM_LCK_BLOCKED,
+ block->b_status != nlm_lck_blocked,
timeout);
if (ret < 0)
return -ERESTARTSYS;
return 0;
}
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static const struct in6_addr *nlmclnt_map_v4addr(const struct sockaddr *sap,
+ struct in6_addr *addr_mapped)
+{
+ const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
+
+ switch (sap->sa_family) {
+ case AF_INET6:
+ return &((const struct sockaddr_in6 *)sap)->sin6_addr;
+ case AF_INET:
+ ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, addr_mapped);
+ return addr_mapped;
+ }
+
+ return NULL;
+}
+
+/*
+ * If lockd is using a PF_INET6 listener, all incoming requests appear
+ * to come from AF_INET6 remotes. The address of AF_INET remotes are
+ * mapped to AF_INET6 automatically by the network layer. In case the
+ * user passed an AF_INET server address at mount time, ensure both
+ * addresses are AF_INET6 before comparing them.
+ */
+static int nlmclnt_cmp_addr(const struct nlm_host *host,
+ const struct sockaddr *sap)
+{
+ const struct in6_addr *addr1;
+ const struct in6_addr *addr2;
+ struct in6_addr addr1_mapped;
+ struct in6_addr addr2_mapped;
+
+ addr1 = nlmclnt_map_v4addr(nlm_addr(host), &addr1_mapped);
+ if (likely(addr1 != NULL)) {
+ addr2 = nlmclnt_map_v4addr(sap, &addr2_mapped);
+ if (likely(addr2 != NULL))
+ return ipv6_addr_equal(addr1, addr2);
+ }
+
+ return 0;
+}
+#else /* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
+static int nlmclnt_cmp_addr(const struct nlm_host *host,
+ const struct sockaddr *sap)
+{
+ return nlm_cmp_addr(nlm_addr(host), sap);
+}
+#endif /* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
+
/*
* The server lockd has called us back to tell us the lock was granted
*/
-u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *lock)
+__be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
{
const struct file_lock *fl = &lock->fl;
const struct nfs_fh *fh = &lock->fh;
struct nlm_wait *block;
- u32 res = nlm_lck_denied;
+ __be32 res = nlm_lck_denied;
/*
* Look up blocked request based on arguments.
*/
if (fl_blocked->fl_u.nfs_fl.owner->pid != lock->svid)
continue;
- if (!nlm_cmp_addr(&block->b_host->h_addr, addr))
+ if (!nlmclnt_cmp_addr(block->b_host, addr))
continue;
- if (nfs_compare_fh(NFS_FH(fl_blocked->fl_file->f_dentry->d_inode) ,fh) != 0)
+ if (nfs_compare_fh(NFS_FH(fl_blocked->fl_file->f_path.dentry->d_inode) ,fh) != 0)
continue;
/* Alright, we found a lock. Set the return status
* and wake up the caller
*/
- block->b_status = NLM_LCK_GRANTED;
+ block->b_status = nlm_granted;
wake_up(&block->b_wait);
res = nlm_granted;
}
*/
/*
- * Someone has sent us an SM_NOTIFY. Ensure we bind to the new port number,
- * that we mark locks for reclaiming, and that we bump the pseudo NSM state.
- */
-static void nlmclnt_prepare_reclaim(struct nlm_host *host)
-{
- down_write(&host->h_rwsem);
- host->h_monitored = 0;
- host->h_state++;
- host->h_nextrebind = 0;
- nlm_rebind_host(host);
-
- /*
- * Mark the locks for reclaiming.
- */
- list_splice_init(&host->h_granted, &host->h_reclaim);
-
- dprintk("NLM: reclaiming locks for host %s\n", host->h_name);
-}
-
-static void nlmclnt_finish_reclaim(struct nlm_host *host)
-{
- host->h_reclaiming = 0;
- up_write(&host->h_rwsem);
- dprintk("NLM: done reclaiming locks for host %s", host->h_name);
-}
-
-/*
* Reclaim all locks on server host. We do this by spawning a separate
* reclaimer thread.
*/
void
-nlmclnt_recovery(struct nlm_host *host, u32 newstate)
+nlmclnt_recovery(struct nlm_host *host)
{
- if (host->h_nsmstate == newstate)
- return;
- host->h_nsmstate = newstate;
+ struct task_struct *task;
+
if (!host->h_reclaiming++) {
nlm_get_host(host);
- __module_get(THIS_MODULE);
- if (kernel_thread(reclaimer, host, CLONE_KERNEL) < 0)
- module_put(THIS_MODULE);
+ task = kthread_run(reclaimer, host, "%s-reclaim", host->h_name);
+ if (IS_ERR(task))
+ printk(KERN_ERR "lockd: unable to spawn reclaimer "
+ "thread. Locks for %s won't be reclaimed! "
+ "(%ld)\n", host->h_name, PTR_ERR(task));
}
}
struct file_lock *fl, *next;
u32 nsmstate;
- daemonize("%s-reclaim", host->h_name);
allow_signal(SIGKILL);
+ down_write(&host->h_rwsem);
+
/* This one ensures that our parent doesn't terminate while the
* reclaim is in progress */
lock_kernel();
- lockd_up();
+ lockd_up(); /* note: this cannot fail as lockd is already running */
+
+ dprintk("lockd: reclaiming locks for host %s\n", host->h_name);
- nlmclnt_prepare_reclaim(host);
- /* First, reclaim all locks that have been marked. */
restart:
nsmstate = host->h_nsmstate;
+
+ /* Force a portmap getport - the peer's lockd will
+ * most likely end up on a different port.
+ */
+ host->h_nextrebind = jiffies;
+ nlm_rebind_host(host);
+
+ /* First, reclaim all locks that have been granted. */
+ list_splice_init(&host->h_granted, &host->h_reclaim);
list_for_each_entry_safe(fl, next, &host->h_reclaim, fl_u.nfs_fl.list) {
list_del_init(&fl->fl_u.nfs_fl.list);
+ /*
+ * sending this thread a SIGKILL will result in any unreclaimed
+ * locks being removed from the h_granted list. This means that
+ * the kernel will not attempt to reclaim them again if a new
+ * reclaimer thread is spawned for this host.
+ */
if (signalled())
continue;
if (nlmclnt_reclaim(host, fl) != 0)
list_add_tail(&fl->fl_u.nfs_fl.list, &host->h_granted);
if (host->h_nsmstate != nsmstate) {
/* Argh! The server rebooted again! */
- list_splice_init(&host->h_granted, &host->h_reclaim);
goto restart;
}
}
- nlmclnt_finish_reclaim(host);
+
+ host->h_reclaiming = 0;
+ up_write(&host->h_rwsem);
+ dprintk("NLM: done reclaiming locks for host %s\n", host->h_name);
/* Now, wake up all processes that sleep on a blocked lock */
list_for_each_entry(block, &nlm_blocked, b_list) {
if (block->b_host == host) {
- block->b_status = NLM_LCK_DENIED_GRACE_PERIOD;
+ block->b_status = nlm_lck_denied_grace_period;
wake_up(&block->b_wait);
}
}
nlm_release_host(host);
lockd_down();
unlock_kernel();
- module_put_and_exit(0);
+ return 0;
}