Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm: dlm: make plock operation killable dlm: remove shared message stub for recovery dlm: delayed reply message warning dlm: Remove superfluous call to recalc_sigpending()
This commit is contained in:
Linus Torvalds
Коммит
df3256f9ab
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@ -100,6 +100,7 @@ struct dlm_cluster {
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unsigned int cl_log_debug;
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unsigned int cl_protocol;
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unsigned int cl_timewarn_cs;
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unsigned int cl_waitwarn_us;
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};
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enum {
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@ -114,6 +115,7 @@ enum {
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CLUSTER_ATTR_LOG_DEBUG,
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CLUSTER_ATTR_PROTOCOL,
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CLUSTER_ATTR_TIMEWARN_CS,
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CLUSTER_ATTR_WAITWARN_US,
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};
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struct cluster_attribute {
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@ -166,6 +168,7 @@ CLUSTER_ATTR(scan_secs, 1);
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CLUSTER_ATTR(log_debug, 0);
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CLUSTER_ATTR(protocol, 0);
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CLUSTER_ATTR(timewarn_cs, 1);
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CLUSTER_ATTR(waitwarn_us, 0);
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static struct configfs_attribute *cluster_attrs[] = {
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[CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
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@ -179,6 +182,7 @@ static struct configfs_attribute *cluster_attrs[] = {
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[CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
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[CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
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[CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
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[CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
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NULL,
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};
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@ -439,6 +443,7 @@ static struct config_group *make_cluster(struct config_group *g,
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cl->cl_log_debug = dlm_config.ci_log_debug;
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cl->cl_protocol = dlm_config.ci_protocol;
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cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
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cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
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space_list = &sps->ss_group;
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comm_list = &cms->cs_group;
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@ -986,6 +991,7 @@ int dlm_our_addr(struct sockaddr_storage *addr, int num)
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#define DEFAULT_LOG_DEBUG 0
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#define DEFAULT_PROTOCOL 0
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#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
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#define DEFAULT_WAITWARN_US 0
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struct dlm_config_info dlm_config = {
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.ci_tcp_port = DEFAULT_TCP_PORT,
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@ -998,6 +1004,7 @@ struct dlm_config_info dlm_config = {
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.ci_scan_secs = DEFAULT_SCAN_SECS,
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.ci_log_debug = DEFAULT_LOG_DEBUG,
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.ci_protocol = DEFAULT_PROTOCOL,
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.ci_timewarn_cs = DEFAULT_TIMEWARN_CS
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.ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
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.ci_waitwarn_us = DEFAULT_WAITWARN_US
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};
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@ -28,6 +28,7 @@ struct dlm_config_info {
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int ci_log_debug;
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int ci_protocol;
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int ci_timewarn_cs;
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int ci_waitwarn_us;
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};
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extern struct dlm_config_info dlm_config;
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@ -209,6 +209,7 @@ struct dlm_args {
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#define DLM_IFL_WATCH_TIMEWARN 0x00400000
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#define DLM_IFL_TIMEOUT_CANCEL 0x00800000
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#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
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#define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */
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#define DLM_IFL_USER 0x00000001
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#define DLM_IFL_ORPHAN 0x00000002
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@ -245,6 +246,7 @@ struct dlm_lkb {
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int8_t lkb_wait_type; /* type of reply waiting for */
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int8_t lkb_wait_count;
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int lkb_wait_nodeid; /* for debugging */
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struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
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struct list_head lkb_statequeue; /* rsb g/c/w list */
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@ -254,6 +256,7 @@ struct dlm_lkb {
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struct list_head lkb_ownqueue; /* list of locks for a process */
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struct list_head lkb_time_list;
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ktime_t lkb_timestamp;
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ktime_t lkb_wait_time;
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unsigned long lkb_timeout_cs;
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struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE];
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182
fs/dlm/lock.c
182
fs/dlm/lock.c
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@ -799,10 +799,84 @@ static int msg_reply_type(int mstype)
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return -1;
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}
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static int nodeid_warned(int nodeid, int num_nodes, int *warned)
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{
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int i;
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for (i = 0; i < num_nodes; i++) {
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if (!warned[i]) {
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warned[i] = nodeid;
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return 0;
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}
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if (warned[i] == nodeid)
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return 1;
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}
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return 0;
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}
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void dlm_scan_waiters(struct dlm_ls *ls)
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{
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struct dlm_lkb *lkb;
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ktime_t zero = ktime_set(0, 0);
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s64 us;
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s64 debug_maxus = 0;
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u32 debug_scanned = 0;
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u32 debug_expired = 0;
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int num_nodes = 0;
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int *warned = NULL;
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if (!dlm_config.ci_waitwarn_us)
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return;
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mutex_lock(&ls->ls_waiters_mutex);
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list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
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if (ktime_equal(lkb->lkb_wait_time, zero))
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continue;
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debug_scanned++;
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us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_wait_time));
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if (us < dlm_config.ci_waitwarn_us)
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continue;
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lkb->lkb_wait_time = zero;
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debug_expired++;
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if (us > debug_maxus)
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debug_maxus = us;
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if (!num_nodes) {
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num_nodes = ls->ls_num_nodes;
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warned = kmalloc(GFP_KERNEL, num_nodes * sizeof(int));
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if (warned)
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memset(warned, 0, num_nodes * sizeof(int));
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}
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if (!warned)
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continue;
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if (nodeid_warned(lkb->lkb_wait_nodeid, num_nodes, warned))
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continue;
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log_error(ls, "waitwarn %x %lld %d us check connection to "
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"node %d", lkb->lkb_id, (long long)us,
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dlm_config.ci_waitwarn_us, lkb->lkb_wait_nodeid);
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}
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mutex_unlock(&ls->ls_waiters_mutex);
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if (warned)
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kfree(warned);
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if (debug_expired)
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log_debug(ls, "scan_waiters %u warn %u over %d us max %lld us",
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debug_scanned, debug_expired,
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dlm_config.ci_waitwarn_us, (long long)debug_maxus);
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}
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/* add/remove lkb from global waiters list of lkb's waiting for
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a reply from a remote node */
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static int add_to_waiters(struct dlm_lkb *lkb, int mstype)
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static int add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid)
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{
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struct dlm_ls *ls = lkb->lkb_resource->res_ls;
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int error = 0;
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@ -842,6 +916,8 @@ static int add_to_waiters(struct dlm_lkb *lkb, int mstype)
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lkb->lkb_wait_count++;
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lkb->lkb_wait_type = mstype;
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lkb->lkb_wait_time = ktime_get();
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lkb->lkb_wait_nodeid = to_nodeid; /* for debugging */
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hold_lkb(lkb);
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list_add(&lkb->lkb_wait_reply, &ls->ls_waiters);
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out:
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@ -961,10 +1037,10 @@ static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms)
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struct dlm_ls *ls = lkb->lkb_resource->res_ls;
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int error;
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if (ms != &ls->ls_stub_ms)
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if (ms->m_flags != DLM_IFL_STUB_MS)
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mutex_lock(&ls->ls_waiters_mutex);
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error = _remove_from_waiters(lkb, ms->m_type, ms);
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if (ms != &ls->ls_stub_ms)
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if (ms->m_flags != DLM_IFL_STUB_MS)
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mutex_unlock(&ls->ls_waiters_mutex);
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return error;
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}
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@ -1157,6 +1233,16 @@ void dlm_adjust_timeouts(struct dlm_ls *ls)
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list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list)
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lkb->lkb_timestamp = ktime_add_us(lkb->lkb_timestamp, adj_us);
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mutex_unlock(&ls->ls_timeout_mutex);
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if (!dlm_config.ci_waitwarn_us)
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return;
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mutex_lock(&ls->ls_waiters_mutex);
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list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
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if (ktime_to_us(lkb->lkb_wait_time))
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lkb->lkb_wait_time = ktime_get();
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}
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mutex_unlock(&ls->ls_waiters_mutex);
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}
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/* lkb is master or local copy */
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@ -1376,14 +1462,8 @@ static void grant_lock_pending(struct dlm_rsb *r, struct dlm_lkb *lkb)
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ALTPR/ALTCW: our rqmode may have been changed to PR or CW to become
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compatible with other granted locks */
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static void munge_demoted(struct dlm_lkb *lkb, struct dlm_message *ms)
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static void munge_demoted(struct dlm_lkb *lkb)
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{
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if (ms->m_type != DLM_MSG_CONVERT_REPLY) {
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log_print("munge_demoted %x invalid reply type %d",
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lkb->lkb_id, ms->m_type);
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return;
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}
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if (lkb->lkb_rqmode == DLM_LOCK_IV || lkb->lkb_grmode == DLM_LOCK_IV) {
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log_print("munge_demoted %x invalid modes gr %d rq %d",
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lkb->lkb_id, lkb->lkb_grmode, lkb->lkb_rqmode);
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@ -2844,12 +2924,12 @@ static int send_common(struct dlm_rsb *r, struct dlm_lkb *lkb, int mstype)
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struct dlm_mhandle *mh;
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int to_nodeid, error;
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error = add_to_waiters(lkb, mstype);
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to_nodeid = r->res_nodeid;
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error = add_to_waiters(lkb, mstype, to_nodeid);
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if (error)
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return error;
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to_nodeid = r->res_nodeid;
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error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh);
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if (error)
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goto fail;
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@ -2880,9 +2960,9 @@ static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb)
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/* down conversions go without a reply from the master */
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if (!error && down_conversion(lkb)) {
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remove_from_waiters(lkb, DLM_MSG_CONVERT_REPLY);
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r->res_ls->ls_stub_ms.m_flags = DLM_IFL_STUB_MS;
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r->res_ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY;
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r->res_ls->ls_stub_ms.m_result = 0;
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r->res_ls->ls_stub_ms.m_flags = lkb->lkb_flags;
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__receive_convert_reply(r, lkb, &r->res_ls->ls_stub_ms);
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}
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@ -2951,12 +3031,12 @@ static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb)
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struct dlm_mhandle *mh;
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int to_nodeid, error;
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error = add_to_waiters(lkb, DLM_MSG_LOOKUP);
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to_nodeid = dlm_dir_nodeid(r);
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error = add_to_waiters(lkb, DLM_MSG_LOOKUP, to_nodeid);
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if (error)
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return error;
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to_nodeid = dlm_dir_nodeid(r);
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error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh);
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if (error)
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goto fail;
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@ -3070,6 +3150,9 @@ static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms)
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static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
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{
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if (ms->m_flags == DLM_IFL_STUB_MS)
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return;
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lkb->lkb_sbflags = ms->m_sbflags;
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lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
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(ms->m_flags & 0x0000FFFF);
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@ -3612,7 +3695,7 @@ static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
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/* convert was queued on remote master */
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receive_flags_reply(lkb, ms);
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if (is_demoted(lkb))
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munge_demoted(lkb, ms);
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munge_demoted(lkb);
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del_lkb(r, lkb);
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add_lkb(r, lkb, DLM_LKSTS_CONVERT);
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add_timeout(lkb);
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@ -3622,7 +3705,7 @@ static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
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/* convert was granted on remote master */
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receive_flags_reply(lkb, ms);
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if (is_demoted(lkb))
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munge_demoted(lkb, ms);
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munge_demoted(lkb);
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grant_lock_pc(r, lkb, ms);
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queue_cast(r, lkb, 0);
|
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break;
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|
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@ -3996,15 +4079,17 @@ void dlm_receive_buffer(union dlm_packet *p, int nodeid)
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dlm_put_lockspace(ls);
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}
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|
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static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb)
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static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb,
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struct dlm_message *ms_stub)
|
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{
|
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if (middle_conversion(lkb)) {
|
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hold_lkb(lkb);
|
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ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY;
|
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ls->ls_stub_ms.m_result = -EINPROGRESS;
|
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ls->ls_stub_ms.m_flags = lkb->lkb_flags;
|
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ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;
|
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_receive_convert_reply(lkb, &ls->ls_stub_ms);
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memset(ms_stub, 0, sizeof(struct dlm_message));
|
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ms_stub->m_flags = DLM_IFL_STUB_MS;
|
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ms_stub->m_type = DLM_MSG_CONVERT_REPLY;
|
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ms_stub->m_result = -EINPROGRESS;
|
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ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
|
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_receive_convert_reply(lkb, ms_stub);
|
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|
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/* Same special case as in receive_rcom_lock_args() */
|
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lkb->lkb_grmode = DLM_LOCK_IV;
|
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|
|
@ -4045,13 +4130,27 @@ static int waiter_needs_recovery(struct dlm_ls *ls, struct dlm_lkb *lkb)
|
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void dlm_recover_waiters_pre(struct dlm_ls *ls)
|
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{
|
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struct dlm_lkb *lkb, *safe;
|
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struct dlm_message *ms_stub;
|
||||
int wait_type, stub_unlock_result, stub_cancel_result;
|
||||
|
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ms_stub = kmalloc(GFP_KERNEL, sizeof(struct dlm_message));
|
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if (!ms_stub) {
|
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log_error(ls, "dlm_recover_waiters_pre no mem");
|
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return;
|
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}
|
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|
||||
mutex_lock(&ls->ls_waiters_mutex);
|
||||
|
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list_for_each_entry_safe(lkb, safe, &ls->ls_waiters, lkb_wait_reply) {
|
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log_debug(ls, "pre recover waiter lkid %x type %d flags %x",
|
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lkb->lkb_id, lkb->lkb_wait_type, lkb->lkb_flags);
|
||||
|
||||
/* exclude debug messages about unlocks because there can be so
|
||||
many and they aren't very interesting */
|
||||
|
||||
if (lkb->lkb_wait_type != DLM_MSG_UNLOCK) {
|
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log_debug(ls, "recover_waiter %x nodeid %d "
|
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"msg %d to %d", lkb->lkb_id, lkb->lkb_nodeid,
|
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lkb->lkb_wait_type, lkb->lkb_wait_nodeid);
|
||||
}
|
||||
|
||||
/* all outstanding lookups, regardless of destination will be
|
||||
resent after recovery is done */
|
||||
|
|
@ -4097,26 +4196,28 @@ void dlm_recover_waiters_pre(struct dlm_ls *ls)
|
|||
break;
|
||||
|
||||
case DLM_MSG_CONVERT:
|
||||
recover_convert_waiter(ls, lkb);
|
||||
recover_convert_waiter(ls, lkb, ms_stub);
|
||||
break;
|
||||
|
||||
case DLM_MSG_UNLOCK:
|
||||
hold_lkb(lkb);
|
||||
ls->ls_stub_ms.m_type = DLM_MSG_UNLOCK_REPLY;
|
||||
ls->ls_stub_ms.m_result = stub_unlock_result;
|
||||
ls->ls_stub_ms.m_flags = lkb->lkb_flags;
|
||||
ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;
|
||||
_receive_unlock_reply(lkb, &ls->ls_stub_ms);
|
||||
memset(ms_stub, 0, sizeof(struct dlm_message));
|
||||
ms_stub->m_flags = DLM_IFL_STUB_MS;
|
||||
ms_stub->m_type = DLM_MSG_UNLOCK_REPLY;
|
||||
ms_stub->m_result = stub_unlock_result;
|
||||
ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
|
||||
_receive_unlock_reply(lkb, ms_stub);
|
||||
dlm_put_lkb(lkb);
|
||||
break;
|
||||
|
||||
case DLM_MSG_CANCEL:
|
||||
hold_lkb(lkb);
|
||||
ls->ls_stub_ms.m_type = DLM_MSG_CANCEL_REPLY;
|
||||
ls->ls_stub_ms.m_result = stub_cancel_result;
|
||||
ls->ls_stub_ms.m_flags = lkb->lkb_flags;
|
||||
ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;
|
||||
_receive_cancel_reply(lkb, &ls->ls_stub_ms);
|
||||
memset(ms_stub, 0, sizeof(struct dlm_message));
|
||||
ms_stub->m_flags = DLM_IFL_STUB_MS;
|
||||
ms_stub->m_type = DLM_MSG_CANCEL_REPLY;
|
||||
ms_stub->m_result = stub_cancel_result;
|
||||
ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
|
||||
_receive_cancel_reply(lkb, ms_stub);
|
||||
dlm_put_lkb(lkb);
|
||||
break;
|
||||
|
||||
|
|
@ -4127,6 +4228,7 @@ void dlm_recover_waiters_pre(struct dlm_ls *ls)
|
|||
schedule();
|
||||
}
|
||||
mutex_unlock(&ls->ls_waiters_mutex);
|
||||
kfree(ms_stub);
|
||||
}
|
||||
|
||||
static struct dlm_lkb *find_resend_waiter(struct dlm_ls *ls)
|
||||
|
|
@ -4191,8 +4293,8 @@ int dlm_recover_waiters_post(struct dlm_ls *ls)
|
|||
ou = is_overlap_unlock(lkb);
|
||||
err = 0;
|
||||
|
||||
log_debug(ls, "recover_waiters_post %x type %d flags %x %s",
|
||||
lkb->lkb_id, mstype, lkb->lkb_flags, r->res_name);
|
||||
log_debug(ls, "recover_waiter %x nodeid %d msg %d r_nodeid %d",
|
||||
lkb->lkb_id, lkb->lkb_nodeid, mstype, r->res_nodeid);
|
||||
|
||||
/* At this point we assume that we won't get a reply to any
|
||||
previous op or overlap op on this lock. First, do a big
|
||||
|
|
|
|||
|
|
@ -24,6 +24,7 @@ int dlm_put_lkb(struct dlm_lkb *lkb);
|
|||
void dlm_scan_rsbs(struct dlm_ls *ls);
|
||||
int dlm_lock_recovery_try(struct dlm_ls *ls);
|
||||
void dlm_unlock_recovery(struct dlm_ls *ls);
|
||||
void dlm_scan_waiters(struct dlm_ls *ls);
|
||||
void dlm_scan_timeout(struct dlm_ls *ls);
|
||||
void dlm_adjust_timeouts(struct dlm_ls *ls);
|
||||
|
||||
|
|
|
|||
|
|
@ -243,7 +243,6 @@ static struct dlm_ls *find_ls_to_scan(void)
|
|||
static int dlm_scand(void *data)
|
||||
{
|
||||
struct dlm_ls *ls;
|
||||
int timeout_jiffies = dlm_config.ci_scan_secs * HZ;
|
||||
|
||||
while (!kthread_should_stop()) {
|
||||
ls = find_ls_to_scan();
|
||||
|
|
@ -252,13 +251,14 @@ static int dlm_scand(void *data)
|
|||
ls->ls_scan_time = jiffies;
|
||||
dlm_scan_rsbs(ls);
|
||||
dlm_scan_timeout(ls);
|
||||
dlm_scan_waiters(ls);
|
||||
dlm_unlock_recovery(ls);
|
||||
} else {
|
||||
ls->ls_scan_time += HZ;
|
||||
}
|
||||
} else {
|
||||
schedule_timeout_interruptible(timeout_jiffies);
|
||||
continue;
|
||||
}
|
||||
schedule_timeout_interruptible(dlm_config.ci_scan_secs * HZ);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -71,6 +71,36 @@ static void send_op(struct plock_op *op)
|
|||
wake_up(&send_wq);
|
||||
}
|
||||
|
||||
/* If a process was killed while waiting for the only plock on a file,
|
||||
locks_remove_posix will not see any lock on the file so it won't
|
||||
send an unlock-close to us to pass on to userspace to clean up the
|
||||
abandoned waiter. So, we have to insert the unlock-close when the
|
||||
lock call is interrupted. */
|
||||
|
||||
static void do_unlock_close(struct dlm_ls *ls, u64 number,
|
||||
struct file *file, struct file_lock *fl)
|
||||
{
|
||||
struct plock_op *op;
|
||||
|
||||
op = kzalloc(sizeof(*op), GFP_NOFS);
|
||||
if (!op)
|
||||
return;
|
||||
|
||||
op->info.optype = DLM_PLOCK_OP_UNLOCK;
|
||||
op->info.pid = fl->fl_pid;
|
||||
op->info.fsid = ls->ls_global_id;
|
||||
op->info.number = number;
|
||||
op->info.start = 0;
|
||||
op->info.end = OFFSET_MAX;
|
||||
if (fl->fl_lmops && fl->fl_lmops->fl_grant)
|
||||
op->info.owner = (__u64) fl->fl_pid;
|
||||
else
|
||||
op->info.owner = (__u64)(long) fl->fl_owner;
|
||||
|
||||
op->info.flags |= DLM_PLOCK_FL_CLOSE;
|
||||
send_op(op);
|
||||
}
|
||||
|
||||
int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
|
||||
int cmd, struct file_lock *fl)
|
||||
{
|
||||
|
|
@ -114,9 +144,19 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
|
|||
|
||||
send_op(op);
|
||||
|
||||
if (xop->callback == NULL)
|
||||
wait_event(recv_wq, (op->done != 0));
|
||||
else {
|
||||
if (xop->callback == NULL) {
|
||||
rv = wait_event_killable(recv_wq, (op->done != 0));
|
||||
if (rv == -ERESTARTSYS) {
|
||||
log_debug(ls, "dlm_posix_lock: wait killed %llx",
|
||||
(unsigned long long)number);
|
||||
spin_lock(&ops_lock);
|
||||
list_del(&op->list);
|
||||
spin_unlock(&ops_lock);
|
||||
kfree(xop);
|
||||
do_unlock_close(ls, number, file, fl);
|
||||
goto out;
|
||||
}
|
||||
} else {
|
||||
rv = FILE_LOCK_DEFERRED;
|
||||
goto out;
|
||||
}
|
||||
|
|
@ -233,6 +273,13 @@ int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
|
|||
else
|
||||
op->info.owner = (__u64)(long) fl->fl_owner;
|
||||
|
||||
if (fl->fl_flags & FL_CLOSE) {
|
||||
op->info.flags |= DLM_PLOCK_FL_CLOSE;
|
||||
send_op(op);
|
||||
rv = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
send_op(op);
|
||||
wait_event(recv_wq, (op->done != 0));
|
||||
|
||||
|
|
@ -334,7 +381,10 @@ static ssize_t dev_read(struct file *file, char __user *u, size_t count,
|
|||
spin_lock(&ops_lock);
|
||||
if (!list_empty(&send_list)) {
|
||||
op = list_entry(send_list.next, struct plock_op, list);
|
||||
list_move(&op->list, &recv_list);
|
||||
if (op->info.flags & DLM_PLOCK_FL_CLOSE)
|
||||
list_del(&op->list);
|
||||
else
|
||||
list_move(&op->list, &recv_list);
|
||||
memcpy(&info, &op->info, sizeof(info));
|
||||
}
|
||||
spin_unlock(&ops_lock);
|
||||
|
|
@ -342,6 +392,13 @@ static ssize_t dev_read(struct file *file, char __user *u, size_t count,
|
|||
if (!op)
|
||||
return -EAGAIN;
|
||||
|
||||
/* there is no need to get a reply from userspace for unlocks
|
||||
that were generated by the vfs cleaning up for a close
|
||||
(the process did not make an unlock call). */
|
||||
|
||||
if (op->info.flags & DLM_PLOCK_FL_CLOSE)
|
||||
kfree(op);
|
||||
|
||||
if (copy_to_user(u, &info, sizeof(info)))
|
||||
return -EFAULT;
|
||||
return sizeof(info);
|
||||
|
|
|
|||
|
|
@ -611,7 +611,6 @@ static ssize_t device_write(struct file *file, const char __user *buf,
|
|||
|
||||
out_sig:
|
||||
sigprocmask(SIG_SETMASK, &tmpsig, NULL);
|
||||
recalc_sigpending();
|
||||
out_free:
|
||||
kfree(kbuf);
|
||||
return error;
|
||||
|
|
|
|||
|
|
@ -14,7 +14,7 @@
|
|||
#define DLM_PLOCK_MISC_NAME "dlm_plock"
|
||||
|
||||
#define DLM_PLOCK_VERSION_MAJOR 1
|
||||
#define DLM_PLOCK_VERSION_MINOR 1
|
||||
#define DLM_PLOCK_VERSION_MINOR 2
|
||||
#define DLM_PLOCK_VERSION_PATCH 0
|
||||
|
||||
enum {
|
||||
|
|
@ -23,12 +23,14 @@ enum {
|
|||
DLM_PLOCK_OP_GET,
|
||||
};
|
||||
|
||||
#define DLM_PLOCK_FL_CLOSE 1
|
||||
|
||||
struct dlm_plock_info {
|
||||
__u32 version[3];
|
||||
__u8 optype;
|
||||
__u8 ex;
|
||||
__u8 wait;
|
||||
__u8 pad;
|
||||
__u8 flags;
|
||||
__u32 pid;
|
||||
__s32 nodeid;
|
||||
__s32 rv;
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче