#include <linux/freezer.h>
#include <linux/fs_struct.h>
#include <linux/kthread.h>
+#include <linux/swap.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/stats.h>
#define NFSDDBG_FACILITY NFSDDBG_SVC
-/* these signals will be delivered to an nfsd thread
- * when handling a request
- */
-#define ALLOWED_SIGS (sigmask(SIGKILL))
-/* these signals will be delivered to an nfsd thread
- * when not handling a request. i.e. when waiting
- */
-#define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT))
-
extern struct svc_program nfsd_program;
static int nfsd(void *vrqstp);
struct timeval nfssvc_boot;
-static atomic_t nfsd_busy;
-static unsigned long nfsd_last_call;
-static DEFINE_SPINLOCK(nfsd_call_lock);
/*
* nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
int nfsd_nrthreads(void)
{
- if (nfsd_serv == NULL)
- return 0;
- else
- return nfsd_serv->sv_nrthreads;
+ int rv = 0;
+ mutex_lock(&nfsd_mutex);
+ if (nfsd_serv)
+ rv = nfsd_serv->sv_nrthreads;
+ mutex_unlock(&nfsd_mutex);
+ return rv;
}
static void nfsd_last_thread(struct svc_serv *serv)
}
}
+/*
+ * Each session guarantees a negotiated per slot memory cache for replies
+ * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
+ * NFSv4.1 server might want to use more memory for a DRC than a machine
+ * with mutiple services.
+ *
+ * Impose a hard limit on the number of pages for the DRC which varies
+ * according to the machines free pages. This is of course only a default.
+ *
+ * For now this is a #defined shift which could be under admin control
+ * in the future.
+ */
+static void set_max_drc(void)
+{
+ nfsd_serv->sv_drc_max_pages = nr_free_buffer_pages()
+ >> NFSD_DRC_SIZE_SHIFT;
+ nfsd_serv->sv_drc_pages_used = 0;
+ dprintk("%s svc_drc_max_pages %u\n", __func__,
+ nfsd_serv->sv_drc_max_pages);
+}
int nfsd_create_serv(void)
{
nfsd_max_blksize /= 2;
}
- atomic_set(&nfsd_busy, 0);
nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
+ AF_INET,
nfsd_last_thread, nfsd, THIS_MODULE);
if (nfsd_serv == NULL)
err = -ENOMEM;
+ else
+ set_max_drc();
do_gettimeofday(&nfssvc_boot); /* record boot time */
return err;
if (!list_empty(&nfsd_serv->sv_permsocks))
return 0;
- error = lockd_up(IPPROTO_UDP);
- if (error >= 0) {
- error = svc_create_xprt(nfsd_serv, "udp", port,
+ error = svc_create_xprt(nfsd_serv, "udp", port,
SVC_SOCK_DEFAULTS);
- if (error < 0)
- lockd_down();
- }
if (error < 0)
return error;
- error = lockd_up(IPPROTO_TCP);
- if (error >= 0) {
- error = svc_create_xprt(nfsd_serv, "tcp", port,
+ error = lockd_up();
+ if (error < 0)
+ return error;
+
+ error = svc_create_xprt(nfsd_serv, "tcp", port,
SVC_SOCK_DEFAULTS);
- if (error < 0)
- lockd_down();
- }
if (error < 0)
return error;
+
+ error = lockd_up();
+ if (error < 0)
+ return error;
+
return 0;
}
return error;
}
-static inline void
-update_thread_usage(int busy_threads)
-{
- unsigned long prev_call;
- unsigned long diff;
- int decile;
-
- spin_lock(&nfsd_call_lock);
- prev_call = nfsd_last_call;
- nfsd_last_call = jiffies;
- decile = busy_threads*10/nfsdstats.th_cnt;
- if (decile>0 && decile <= 10) {
- diff = nfsd_last_call - prev_call;
- if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
- nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
- if (decile == 10)
- nfsdstats.th_fullcnt++;
- }
- spin_unlock(&nfsd_call_lock);
-}
/*
* This is the NFS server kernel thread
{
struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
struct fs_struct *fsp;
- sigset_t shutdown_mask, allowed_mask;
int err, preverr = 0;
- unsigned int signo;
/* Lock module and set up kernel thread */
mutex_lock(&nfsd_mutex);
current->fs = fsp;
current->fs->umask = 0;
- siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
- siginitsetinv(&allowed_mask, ALLOWED_SIGS);
-
/*
* thread is spawned with all signals set to SIG_IGN, re-enable
- * the ones that matter
+ * the ones that will bring down the thread
*/
- for (signo = 1; signo <= _NSIG; signo++) {
- if (!sigismember(&shutdown_mask, signo))
- allow_signal(signo);
- }
+ allow_signal(SIGKILL);
+ allow_signal(SIGHUP);
+ allow_signal(SIGINT);
+ allow_signal(SIGQUIT);
nfsdstats.th_cnt++;
mutex_unlock(&nfsd_mutex);
* The main request loop
*/
for (;;) {
- /* Block all but the shutdown signals */
- sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
-
/*
* Find a socket with data available and call its
* recvfrom routine.
continue;
}
- update_thread_usage(atomic_read(&nfsd_busy));
- atomic_inc(&nfsd_busy);
/* Lock the export hash tables for reading. */
exp_readlock();
- /* Process request with signals blocked. */
- sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
-
svc_process(rqstp);
/* Unlock export hash tables */
exp_readunlock();
- update_thread_usage(atomic_read(&nfsd_busy));
- atomic_dec(&nfsd_busy);
}
/* Clear signals before calling svc_exit_thread() */
+ rqstp->rq_res.head[0].iov_len;
rqstp->rq_res.head[0].iov_len += sizeof(__be32);
+ /* NFSv4.1 DRC requires statp */
+ if (rqstp->rq_vers == 4)
+ nfsd4_set_statp(rqstp, statp);
+
/* Now call the procedure handler, and encode NFS status. */
nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
nfserr = map_new_errors(rqstp->rq_vers, nfserr);
nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
return 1;
}
+
+int nfsd_pool_stats_open(struct inode *inode, struct file *file)
+{
+ if (nfsd_serv == NULL)
+ return -ENODEV;
+ return svc_pool_stats_open(nfsd_serv, file);
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff