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-rw-r--r--fs/dlm/Kconfig20
-rw-r--r--fs/dlm/Makefile4
-rw-r--r--fs/dlm/dlm_internal.h4
-rw-r--r--fs/dlm/lock.c16
-rw-r--r--fs/dlm/lockspace.c4
-rw-r--r--fs/dlm/lowcomms-sctp.c (renamed from fs/dlm/lowcomms.c)264
-rw-r--r--fs/dlm/lowcomms-tcp.c1189
-rw-r--r--fs/dlm/lowcomms.h2
-rw-r--r--fs/dlm/main.c10
-rw-r--r--fs/dlm/member.c8
-rw-r--r--fs/dlm/rcom.c58
-rw-r--r--fs/dlm/recover.c1
-rw-r--r--fs/dlm/recoverd.c44
-rw-r--r--fs/dlm/requestqueue.c26
-rw-r--r--fs/dlm/requestqueue.h2
15 files changed, 1463 insertions, 189 deletions
diff --git a/fs/dlm/Kconfig b/fs/dlm/Kconfig
index 81b2c6465ee..b5654a284fe 100644
--- a/fs/dlm/Kconfig
+++ b/fs/dlm/Kconfig
@@ -1,14 +1,32 @@
menu "Distributed Lock Manager"
- depends on INET && IP_SCTP && EXPERIMENTAL
+ depends on EXPERIMENTAL && INET
config DLM
tristate "Distributed Lock Manager (DLM)"
depends on IPV6 || IPV6=n
select CONFIGFS_FS
+ select IP_SCTP if DLM_SCTP
help
A general purpose distributed lock manager for kernel or userspace
applications.
+choice
+ prompt "Select DLM communications protocol"
+ depends on DLM
+ default DLM_TCP
+ help
+ The DLM Can use TCP or SCTP for it's network communications.
+ SCTP supports multi-homed operations whereas TCP doesn't.
+ However, SCTP seems to have stability problems at the moment.
+
+config DLM_TCP
+ bool "TCP/IP"
+
+config DLM_SCTP
+ bool "SCTP"
+
+endchoice
+
config DLM_DEBUG
bool "DLM debugging"
depends on DLM
diff --git a/fs/dlm/Makefile b/fs/dlm/Makefile
index 1832e0297f7..65388944eba 100644
--- a/fs/dlm/Makefile
+++ b/fs/dlm/Makefile
@@ -4,7 +4,6 @@ dlm-y := ast.o \
dir.o \
lock.o \
lockspace.o \
- lowcomms.o \
main.o \
member.o \
memory.o \
@@ -17,3 +16,6 @@ dlm-y := ast.o \
util.o
dlm-$(CONFIG_DLM_DEBUG) += debug_fs.o
+dlm-$(CONFIG_DLM_TCP) += lowcomms-tcp.o
+
+dlm-$(CONFIG_DLM_SCTP) += lowcomms-sctp.o \ No newline at end of file
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 1e5cd67e1b7..1ee8195e6fc 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -471,6 +471,7 @@ struct dlm_ls {
char *ls_recover_buf;
int ls_recover_nodeid; /* for debugging */
uint64_t ls_rcom_seq;
+ spinlock_t ls_rcom_spin;
struct list_head ls_recover_list;
spinlock_t ls_recover_list_lock;
int ls_recover_list_count;
@@ -488,7 +489,8 @@ struct dlm_ls {
#define LSFL_RUNNING 1
#define LSFL_RECOVERY_STOP 2
#define LSFL_RCOM_READY 3
-#define LSFL_UEVENT_WAIT 4
+#define LSFL_RCOM_WAIT 4
+#define LSFL_UEVENT_WAIT 5
/* much of this is just saving user space pointers associated with the
lock that we pass back to the user lib with an ast */
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 3f2befa4797..30878defaeb 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -2372,6 +2372,7 @@ static int send_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms_in,
static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms)
{
lkb->lkb_exflags = ms->m_exflags;
+ lkb->lkb_sbflags = ms->m_sbflags;
lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
(ms->m_flags & 0x0000FFFF);
}
@@ -3028,10 +3029,17 @@ int dlm_receive_message(struct dlm_header *hd, int nodeid, int recovery)
while (1) {
if (dlm_locking_stopped(ls)) {
- if (!recovery)
- dlm_add_requestqueue(ls, nodeid, hd);
- error = -EINTR;
- goto out;
+ if (recovery) {
+ error = -EINTR;
+ goto out;
+ }
+ error = dlm_add_requestqueue(ls, nodeid, hd);
+ if (error == -EAGAIN)
+ continue;
+ else {
+ error = -EINTR;
+ goto out;
+ }
}
if (lock_recovery_try(ls))
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index f8842ca443c..59012b089e8 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -22,6 +22,7 @@
#include "memory.h"
#include "lock.h"
#include "recover.h"
+#include "requestqueue.h"
#ifdef CONFIG_DLM_DEBUG
int dlm_create_debug_file(struct dlm_ls *ls);
@@ -478,6 +479,8 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
ls->ls_recoverd_task = NULL;
mutex_init(&ls->ls_recoverd_active);
spin_lock_init(&ls->ls_recover_lock);
+ spin_lock_init(&ls->ls_rcom_spin);
+ get_random_bytes(&ls->ls_rcom_seq, sizeof(uint64_t));
ls->ls_recover_status = 0;
ls->ls_recover_seq = 0;
ls->ls_recover_args = NULL;
@@ -684,6 +687,7 @@ static int release_lockspace(struct dlm_ls *ls, int force)
* Free structures on any other lists
*/
+ dlm_purge_requestqueue(ls);
kfree(ls->ls_recover_args);
dlm_clear_free_entries(ls);
dlm_clear_members(ls);
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms-sctp.c
index 6da6b14d5a6..fe158d7a928 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms-sctp.c
@@ -2,7 +2,7 @@
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
@@ -75,13 +75,13 @@ struct nodeinfo {
};
static DEFINE_IDR(nodeinfo_idr);
-static struct rw_semaphore nodeinfo_lock;
-static int max_nodeid;
+static DECLARE_RWSEM(nodeinfo_lock);
+static int max_nodeid;
struct cbuf {
- unsigned base;
- unsigned len;
- unsigned mask;
+ unsigned int base;
+ unsigned int len;
+ unsigned int mask;
};
/* Just the one of these, now. But this struct keeps
@@ -90,9 +90,9 @@ struct cbuf {
#define CF_READ_PENDING 1
struct connection {
- struct socket *sock;
+ struct socket *sock;
unsigned long flags;
- struct page *rx_page;
+ struct page *rx_page;
atomic_t waiting_requests;
struct cbuf cb;
int eagain_flag;
@@ -102,36 +102,40 @@ struct connection {
struct writequeue_entry {
struct list_head list;
- struct page *page;
+ struct page *page;
int offset;
int len;
int end;
int users;
- struct nodeinfo *ni;
+ struct nodeinfo *ni;
};
-#define CBUF_ADD(cb, n) do { (cb)->len += n; } while(0)
-#define CBUF_EMPTY(cb) ((cb)->len == 0)
-#define CBUF_MAY_ADD(cb, n) (((cb)->len + (n)) < ((cb)->mask + 1))
-#define CBUF_DATA(cb) (((cb)->base + (cb)->len) & (cb)->mask)
+static void cbuf_add(struct cbuf *cb, int n)
+{
+ cb->len += n;
+}
-#define CBUF_INIT(cb, size) \
-do { \
- (cb)->base = (cb)->len = 0; \
- (cb)->mask = ((size)-1); \
-} while(0)
+static int cbuf_data(struct cbuf *cb)
+{
+ return ((cb->base + cb->len) & cb->mask);
+}
-#define CBUF_EAT(cb, n) \
-do { \
- (cb)->len -= (n); \
- (cb)->base += (n); \
- (cb)->base &= (cb)->mask; \
-} while(0)
+static void cbuf_init(struct cbuf *cb, int size)
+{
+ cb->base = cb->len = 0;
+ cb->mask = size-1;
+}
+static void cbuf_eat(struct cbuf *cb, int n)
+{
+ cb->len -= n;
+ cb->base += n;
+ cb->base &= cb->mask;
+}
/* List of nodes which have writes pending */
-static struct list_head write_nodes;
-static spinlock_t write_nodes_lock;
+static LIST_HEAD(write_nodes);
+static DEFINE_SPINLOCK(write_nodes_lock);
/* Maximum number of incoming messages to process before
* doing a schedule()
@@ -141,8 +145,7 @@ static spinlock_t write_nodes_lock;
/* Manage daemons */
static struct task_struct *recv_task;
static struct task_struct *send_task;
-static wait_queue_head_t lowcomms_recv_wait;
-static atomic_t accepting;
+static DECLARE_WAIT_QUEUE_HEAD(lowcomms_recv_wait);
/* The SCTP connection */
static struct connection sctp_con;
@@ -161,11 +164,11 @@ static int nodeid_to_addr(int nodeid, struct sockaddr *retaddr)
return error;
if (dlm_local_addr[0]->ss_family == AF_INET) {
- struct sockaddr_in *in4 = (struct sockaddr_in *) &addr;
+ struct sockaddr_in *in4 = (struct sockaddr_in *) &addr;
struct sockaddr_in *ret4 = (struct sockaddr_in *) retaddr;
ret4->sin_addr.s_addr = in4->sin_addr.s_addr;
} else {
- struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &addr;
+ struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &addr;
struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) retaddr;
memcpy(&ret6->sin6_addr, &in6->sin6_addr,
sizeof(in6->sin6_addr));
@@ -174,6 +177,8 @@ static int nodeid_to_addr(int nodeid, struct sockaddr *retaddr)
return 0;
}
+/* If alloc is 0 here we will not attempt to allocate a new
+ nodeinfo struct */
static struct nodeinfo *nodeid2nodeinfo(int nodeid, gfp_t alloc)
{
struct nodeinfo *ni;
@@ -184,44 +189,45 @@ static struct nodeinfo *nodeid2nodeinfo(int nodeid, gfp_t alloc)
ni = idr_find(&nodeinfo_idr, nodeid);
up_read(&nodeinfo_lock);
- if (!ni && alloc) {
- down_write(&nodeinfo_lock);
+ if (ni || !alloc)
+ return ni;
- ni = idr_find(&nodeinfo_idr, nodeid);
- if (ni)
- goto out_up;
+ down_write(&nodeinfo_lock);
- r = idr_pre_get(&nodeinfo_idr, alloc);
- if (!r)
- goto out_up;
+ ni = idr_find(&nodeinfo_idr, nodeid);
+ if (ni)
+ goto out_up;
- ni = kmalloc(sizeof(struct nodeinfo), alloc);
- if (!ni)
- goto out_up;
+ r = idr_pre_get(&nodeinfo_idr, alloc);
+ if (!r)
+ goto out_up;
- r = idr_get_new_above(&nodeinfo_idr, ni, nodeid, &n);
- if (r) {
- kfree(ni);
- ni = NULL;
- goto out_up;
- }
- if (n != nodeid) {
- idr_remove(&nodeinfo_idr, n);
- kfree(ni);
- ni = NULL;
- goto out_up;
- }
- memset(ni, 0, sizeof(struct nodeinfo));
- spin_lock_init(&ni->lock);
- INIT_LIST_HEAD(&ni->writequeue);
- spin_lock_init(&ni->writequeue_lock);
- ni->nodeid = nodeid;
-
- if (nodeid > max_nodeid)
- max_nodeid = nodeid;
- out_up:
- up_write(&nodeinfo_lock);
+ ni = kmalloc(sizeof(struct nodeinfo), alloc);
+ if (!ni)
+ goto out_up;
+
+ r = idr_get_new_above(&nodeinfo_idr, ni, nodeid, &n);
+ if (r) {
+ kfree(ni);
+ ni = NULL;
+ goto out_up;
}
+ if (n != nodeid) {
+ idr_remove(&nodeinfo_idr, n);
+ kfree(ni);
+ ni = NULL;
+ goto out_up;
+ }
+ memset(ni, 0, sizeof(struct nodeinfo));
+ spin_lock_init(&ni->lock);
+ INIT_LIST_HEAD(&ni->writequeue);
+ spin_lock_init(&ni->writequeue_lock);
+ ni->nodeid = nodeid;
+
+ if (nodeid > max_nodeid)
+ max_nodeid = nodeid;
+out_up:
+ up_write(&nodeinfo_lock);
return ni;
}
@@ -279,13 +285,13 @@ static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port,
in4_addr->sin_port = cpu_to_be16(port);
memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero));
memset(in4_addr+1, 0, sizeof(struct sockaddr_storage) -
- sizeof(struct sockaddr_in));
+ sizeof(struct sockaddr_in));
*addr_len = sizeof(struct sockaddr_in);
} else {
struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr;
in6_addr->sin6_port = cpu_to_be16(port);
memset(in6_addr+1, 0, sizeof(struct sockaddr_storage) -
- sizeof(struct sockaddr_in6));
+ sizeof(struct sockaddr_in6));
*addr_len = sizeof(struct sockaddr_in6);
}
}
@@ -324,7 +330,7 @@ static void send_shutdown(sctp_assoc_t associd)
cmsg->cmsg_type = SCTP_SNDRCV;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
outmessage.msg_controllen = cmsg->cmsg_len;
- sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+ sinfo = CMSG_DATA(cmsg);
memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
sinfo->sinfo_flags |= MSG_EOF;
@@ -387,7 +393,7 @@ static void process_sctp_notification(struct msghdr *msg, char *buf)
if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) {
log_print("COMM_UP for invalid assoc ID %d",
- (int)sn->sn_assoc_change.sac_assoc_id);
+ (int)sn->sn_assoc_change.sac_assoc_id);
init_failed();
return;
}
@@ -398,15 +404,18 @@ static void process_sctp_notification(struct msghdr *msg, char *buf)
fs = get_fs();
set_fs(get_ds());
ret = sctp_con.sock->ops->getsockopt(sctp_con.sock,
- IPPROTO_SCTP, SCTP_PRIMARY_ADDR,
- (char*)&prim, &prim_len);
+ IPPROTO_SCTP,
+ SCTP_PRIMARY_ADDR,
+ (char*)&prim,
+ &prim_len);
set_fs(fs);
if (ret < 0) {
struct nodeinfo *ni;
log_print("getsockopt/sctp_primary_addr on "
"new assoc %d failed : %d",
- (int)sn->sn_assoc_change.sac_assoc_id, ret);
+ (int)sn->sn_assoc_change.sac_assoc_id,
+ ret);
/* Retry INIT later */
ni = assoc2nodeinfo(sn->sn_assoc_change.sac_assoc_id);
@@ -426,12 +435,10 @@ static void process_sctp_notification(struct msghdr *msg, char *buf)
return;
/* Save the assoc ID */
- spin_lock(&ni->lock);
ni->assoc_id = sn->sn_assoc_change.sac_assoc_id;
- spin_unlock(&ni->lock);
log_print("got new/restarted association %d nodeid %d",
- (int)sn->sn_assoc_change.sac_assoc_id, nodeid);
+ (int)sn->sn_assoc_change.sac_assoc_id, nodeid);
/* Send any pending writes */
clear_bit(NI_INIT_PENDING, &ni->flags);
@@ -507,13 +514,12 @@ static int receive_from_sock(void)
sctp_con.rx_page = alloc_page(GFP_ATOMIC);
if (sctp_con.rx_page == NULL)
goto out_resched;
- CBUF_INIT(&sctp_con.cb, PAGE_CACHE_SIZE);
+ cbuf_init(&sctp_con.cb, PAGE_CACHE_SIZE);
}
memset(&incmsg, 0, sizeof(incmsg));
memset(&msgname, 0, sizeof(msgname));
- memset(incmsg, 0, sizeof(incmsg));
msg.msg_name = &msgname;
msg.msg_namelen = sizeof(msgname);
msg.msg_flags = 0;
@@ -532,17 +538,17 @@ static int receive_from_sock(void)
* iov[0] is the bit of the circular buffer between the current end
* point (cb.base + cb.len) and the end of the buffer.
*/
- iov[0].iov_len = sctp_con.cb.base - CBUF_DATA(&sctp_con.cb);
+ iov[0].iov_len = sctp_con.cb.base - cbuf_data(&sctp_con.cb);
iov[0].iov_base = page_address(sctp_con.rx_page) +
- CBUF_DATA(&sctp_con.cb);
+ cbuf_data(&sctp_con.cb);
iov[1].iov_len = 0;
/*
* iov[1] is the bit of the circular buffer between the start of the
* buffer and the start of the currently used section (cb.base)
*/
- if (CBUF_DATA(&sctp_con.cb) >= sctp_con.cb.base) {
- iov[0].iov_len = PAGE_CACHE_SIZE - CBUF_DATA(&sctp_con.cb);
+ if (cbuf_data(&sctp_con.cb) >= sctp_con.cb.base) {
+ iov[0].iov_len = PAGE_CACHE_SIZE - cbuf_data(&sctp_con.cb);
iov[1].iov_len = sctp_con.cb.base;
iov[1].iov_base = page_address(sctp_con.rx_page);
msg.msg_iovlen = 2;
@@ -557,7 +563,7 @@ static int receive_from_sock(void)
msg.msg_control = incmsg;
msg.msg_controllen = sizeof(incmsg);
cmsg = CMSG_FIRSTHDR(&msg);
- sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+ sinfo = CMSG_DATA(cmsg);
if (msg.msg_flags & MSG_NOTIFICATION) {
process_sctp_notification(&msg, page_address(sctp_con.rx_page));
@@ -583,29 +589,29 @@ static int receive_from_sock(void)
if (r == 1)
return 0;
- CBUF_ADD(&sctp_con.cb, ret);
+ cbuf_add(&sctp_con.cb, ret);
ret = dlm_process_incoming_buffer(cpu_to_le32(sinfo->sinfo_ppid),
page_address(sctp_con.rx_page),
sctp_con.cb.base, sctp_con.cb.len,
PAGE_CACHE_SIZE);
if (ret < 0)
goto out_close;
- CBUF_EAT(&sctp_con.cb, ret);
+ cbuf_eat(&sctp_con.cb, ret);
- out:
+out:
ret = 0;
goto out_ret;
- out_resched:
+out_resched:
lowcomms_data_ready(sctp_con.sock->sk, 0);
ret = 0;
- schedule();
+ cond_resched();
goto out_ret;
- out_close:
+out_close:
if (ret != -EAGAIN)
log_print("error reading from sctp socket: %d", ret);
- out_ret:
+out_ret:
return ret;
}
@@ -619,10 +625,12 @@ static int add_bind_addr(struct sockaddr_storage *addr, int addr_len, int num)
set_fs(get_ds());
if (num == 1)
result = sctp_con.sock->ops->bind(sctp_con.sock,
- (struct sockaddr *) addr, addr_len);
+ (struct sockaddr *) addr,
+ addr_len);
else
result = sctp_con.sock->ops->setsockopt(sctp_con.sock, SOL_SCTP,
- SCTP_SOCKOPT_BINDX_ADD, (char *)addr, addr_len);
+ SCTP_SOCKOPT_BINDX_ADD,
+ (char *)addr, addr_len);
set_fs(fs);
if (result < 0)
@@ -719,10 +727,10 @@ static int init_sock(void)
return 0;
- create_delsock:
+create_delsock:
sock_release(sock);
sctp_con.sock = NULL;
- out:
+out:
return result;
}
@@ -756,16 +764,13 @@ void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc)
int users = 0;
struct nodeinfo *ni;
- if (!atomic_read(&accepting))
- return NULL;
-
ni = nodeid2nodeinfo(nodeid, allocation);
if (!ni)
return NULL;
spin_lock(&ni->writequeue_lock);
e = list_entry(ni->writequeue.prev, struct writequeue_entry, list);
- if (((struct list_head *) e == &ni->writequeue) ||
+ if ((&e->list == &ni->writequeue) ||
(PAGE_CACHE_SIZE - e->end < len)) {
e = NULL;
} else {
@@ -776,7 +781,7 @@ void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc)
spin_unlock(&ni->writequeue_lock);
if (e) {
- got_one:
+ got_one:
if (users == 0)
kmap(e->page);
*ppc = page_address(e->page) + offset;
@@ -803,9 +808,6 @@ void dlm_lowcomms_commit_buffer(void *arg)
int users;
struct nodeinfo *ni = e->ni;
- if (!atomic_read(&accepting))
- return;
-
spin_lock(&ni->writequeue_lock);
users = --e->users;
if (users)
@@ -822,7 +824,7 @@ void dlm_lowcomms_commit_buffer(void *arg)
}
return;
- out:
+out:
spin_unlock(&ni->writequeue_lock);
return;
}
@@ -878,7 +880,7 @@ static void initiate_association(int nodeid)
cmsg->cmsg_level = IPPROTO_SCTP;
cmsg->cmsg_type = SCTP_SNDRCV;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
- sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+ sinfo = CMSG_DATA(cmsg);
memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
sinfo->sinfo_ppid = cpu_to_le32(dlm_local_nodeid);
@@ -892,7 +894,7 @@ static void initiate_association(int nodeid)
}
/* Send a message */
-static int send_to_sock(struct nodeinfo *ni)
+static void send_to_sock(struct nodeinfo *ni)
{
int ret = 0;
struct writequeue_entry *e;
@@ -903,13 +905,13 @@ static int send_to_sock(struct nodeinfo *ni)
struct sctp_sndrcvinfo *sinfo;
struct kvec iov;
- /* See if we need to init an association before we start
+ /* See if we need to init an association before we start
sending precious messages */
spin_lock(&ni->lock);
if (!ni->assoc_id && !test_and_set_bit(NI_INIT_PENDING, &ni->flags)) {
spin_unlock(&ni->lock);
initiate_association(ni->nodeid);
- return 0;
+ return;
}
spin_unlock(&ni->lock);
@@ -923,7 +925,7 @@ static int send_to_sock(struct nodeinfo *ni)
cmsg->cmsg_level = IPPROTO_SCTP;
cmsg->cmsg_type = SCTP_SNDRCV;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
- sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+ sinfo = CMSG_DATA(cmsg);
memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
sinfo->sinfo_ppid = cpu_to_le32(dlm_local_nodeid);
sinfo->sinfo_assoc_id = ni->assoc_id;
@@ -955,7 +957,7 @@ static int send_to_sock(struct nodeinfo *ni)
goto send_error;
} else {
/* Don't starve people filling buffers */
- schedule();
+ cond_resched();
}
spin_lock(&ni->writequeue_lock);
@@ -964,15 +966,16 @@ static int send_to_sock(struct nodeinfo *ni)
if (e->len == 0 && e->users == 0) {
list_del(&e->list);
+ kunmap(e->page);
free_entry(e);
continue;
}
}
spin_unlock(&ni->writequeue_lock);
- out:
- return ret;
+out:
+ return;
- send_error:
+send_error:
log_print("Error sending to node %d %d", ni->nodeid, ret);
spin_lock(&ni->lock);
if (!test_and_set_bit(NI_INIT_PENDING, &ni->flags)) {
@@ -982,7 +985,7 @@ static int send_to_sock(struct nodeinfo *ni)
} else
spin_unlock(&ni->lock);
- return ret;
+ return;
}
/* Try to send any messages that are pending */
@@ -994,7 +997,7 @@ static void process_output_queue(void)
spin_lock_bh(&write_nodes_lock);
list_for_each_safe(list, temp, &write_nodes) {
struct nodeinfo *ni =
- list_entry(list, struct nodeinfo, write_list);
+ list_entry(list, struct nodeinfo, write_list);
clear_bit(NI_WRITE_PENDING, &ni->flags);
list_del(&ni->write_list);
@@ -1106,7 +1109,7 @@ static int dlm_recvd(void *data)
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&lowcomms_recv_wait, &wait);
if (!test_bit(CF_READ_PENDING, &sctp_con.flags))
- schedule();
+ cond_resched();
remove_wait_queue(&lowcomms_recv_wait, &wait);
set_current_state(TASK_RUNNING);
@@ -1118,12 +1121,12 @@ static int dlm_recvd(void *data)
/* Don't starve out everyone else */
if (++count >= MAX_RX_MSG_COUNT) {
- schedule();
+ cond_resched();
count = 0;
}
} while (!kthread_should_stop() && ret >=0);
}
- schedule();
+ cond_resched();
}
return 0;
@@ -1138,7 +1141,7 @@ static int dlm_sendd(void *data)
while (!kthread_should_stop()) {
set_current_state(TASK_INTERRUPTIBLE);
if (write_list_empty())
- schedule();
+ cond_resched();
set_current_state(TASK_RUNNING);
if (sctp_con.eagain_flag) {
@@ -1166,7 +1169,7 @@ static int daemons_start(void)
p = kthread_run(dlm_recvd, NULL, "dlm_recvd");
error = IS_ERR(p);
- if (error) {
+ if (error) {
log_print("can't start dlm_recvd %d", error);
return error;
}
@@ -1174,7 +1177,7 @@ static int daemons_start(void)
p = kthread_run(dlm_sendd, NULL, "dlm_sendd");
error = IS_ERR(p);
- if (error) {
+ if (error) {
log_print("can't start dlm_sendd %d", error);
kthread_stop(recv_task);
return error;
@@ -1197,43 +1200,28 @@ int dlm_lowcomms_start(void)
error = daemons_start();
if (error)
goto fail_sock;
- atomic_set(&accepting, 1);
return 0;
- fail_sock:
+fail_sock:
close_connection();
return error;
}
-/* Set all the activity flags to prevent any socket activity. */
-
void dlm_lowcomms_stop(void)
{
- atomic_set(&accepting, 0);
+ int i;
+
sctp_con.flags = 0x7;
daemons_stop();
clean_writequeues();
close_connection();
dealloc_nodeinfo();
max_nodeid = 0;
-}
-int dlm_lowcomms_init(void)
-{
- init_waitqueue_head(&lowcomms_recv_wait);
- spin_lock_init(&write_nodes_lock);
- INIT_LIST_HEAD(&write_nodes);
- init_rwsem(&nodeinfo_lock);
- return 0;
-}
-
-void dlm_lowcomms_exit(void)
-{
- int i;
+ dlm_local_count = 0;
+ dlm_local_nodeid = 0;
for (i = 0; i < dlm_local_count; i++)
kfree(dlm_local_addr[i]);
- dlm_local_count = 0;
- dlm_local_nodeid = 0;
}
diff --git a/fs/dlm/lowcomms-tcp.c b/fs/dlm/lowcomms-tcp.c
new file mode 100644
index 00000000000..8f2791fc844
--- /dev/null
+++ b/fs/dlm/lowcomms-tcp.c
@@ -0,0 +1,1189 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+/*
+ * lowcomms.c
+ *
+ * This is the "low-level" comms layer.
+ *
+ * It is responsible for sending/receiving messages
+ * from other nodes in the cluster.
+ *
+ * Cluster nodes are referred to by their nodeids. nodeids are
+ * simply 32 bit numbers to the locking module - if they need to
+ * be expanded for the cluster infrastructure then that is it's
+ * responsibility. It is this layer's
+ * responsibility to resolve these into IP address or
+ * whatever it needs for inter-node communication.
+ *
+ * The comms level is two kernel threads that deal mainly with
+ * the receiving of messages from other nodes and passing them
+ * up to the mid-level comms layer (which understands the
+ * message format) for execution by the locking core, and
+ * a send thread which does all the setting up of connections
+ * to remote nodes and the sending of data. Threads are not allowed
+ * to send their own data because it may cause them to wait in times
+ * of high load. Also, this way, the sending thread can collect together
+ * messages bound for one node and send them in one block.
+ *
+ * I don't see any problem with the recv thread executing the locking
+ * code on behalf of remote processes as the locking code is
+ * short, efficient and never waits.
+ *
+ */
+
+
+#include <asm/ioctls.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <linux/pagemap.h>
+
+#include "dlm_internal.h"
+#include "lowcomms.h"
+#include "midcomms.h"
+#include "config.h"
+
+struct cbuf {
+ unsigned int base;
+ unsigned int len;
+ unsigned int mask;
+};
+
+#define NODE_INCREMENT 32
+static void cbuf_add(struct cbuf *cb, int n)
+{
+ cb->len += n;
+}
+
+static int cbuf_data(struct cbuf *cb)
+{
+ return ((cb->base + cb->len) & cb->mask);
+}
+
+static void cbuf_init(struct cbuf *cb, int size)
+{
+ cb->base = cb->len = 0;
+ cb->mask = size-1;
+}
+
+static void cbuf_eat(struct cbuf *cb, int n)
+{
+ cb->len -= n;
+ cb->base += n;
+ cb->base &= cb->mask;
+}
+
+static bool cbuf_empty(struct cbuf *cb)
+{
+ return cb->len == 0;
+}
+
+/* Maximum number of incoming messages to process before
+ doing a cond_resched()
+*/
+#define MAX_RX_MSG_COUNT 25
+
+struct connection {
+ struct socket *sock; /* NULL if not connected */
+ uint32_t nodeid; /* So we know who we are in the list */
+ struct rw_semaphore sock_sem; /* Stop connect races */
+ struct list_head read_list; /* On this list when ready for reading */
+ struct list_head write_list; /* On this list when ready for writing */
+ struct list_head state_list; /* On this list when ready to connect */
+ unsigned long flags; /* bit 1,2 = We are on the read/write lists */
+#define CF_READ_PENDING 1
+#define CF_WRITE_PENDING 2
+#define CF_CONNECT_PENDING 3
+#define CF_IS_OTHERCON 4
+ struct list_head writequeue; /* List of outgoing writequeue_entries */
+ struct list_head listenlist; /* List of allocated listening sockets */
+ spinlock_t writequeue_lock;
+ int (*rx_action) (struct connection *); /* What to do when active */
+ struct page *rx_page;
+ struct cbuf cb;
+ int retries;
+ atomic_t waiting_requests;
+#define MAX_CONNECT_RETRIES 3
+ struct connection *othercon;
+};
+#define sock2con(x) ((struct connection *)(x)->sk_user_data)
+
+/* An entry waiting to be sent */
+struct writequeue_entry {
+ struct list_head list;
+ struct page *page;
+ int offset;
+ int len;
+ int end;
+ int users;
+ struct connection *con;
+};
+
+static struct sockaddr_storage dlm_local_addr;
+
+/* Manage daemons */
+static struct task_struct *recv_task;
+static struct task_struct *send_task;
+
+static wait_queue_t lowcomms_send_waitq_head;
+static DECLARE_WAIT_QUEUE_HEAD(lowcomms_send_waitq);
+static wait_queue_t lowcomms_recv_waitq_head;
+static DECLARE_WAIT_QUEUE_HEAD(lowcomms_recv_waitq);
+
+/* An array of pointers to connections, indexed by NODEID */
+static struct connection **connections;
+static DECLARE_MUTEX(connections_lock);
+static kmem_cache_t *con_cache;
+static int conn_array_size;
+
+/* List of sockets that have reads pending */
+static LIST_HEAD(read_sockets);
+static DEFINE_SPINLOCK(read_sockets_lock);
+
+/* List of sockets which have writes pending */
+static LIST_HEAD(write_sockets);
+static DEFINE_SPINLOCK(write_sockets_lock);
+
+/* List of sockets which have connects pending */
+static LIST_HEAD(state_sockets);
+static DEFINE_SPINLOCK(state_sockets_lock);
+
+static struct connection *nodeid2con(int nodeid, gfp_t allocation)
+{
+ struct connection *con = NULL;
+
+ down(&connections_lock);
+ if (nodeid >= conn_array_size) {
+ int new_size = nodeid + NODE_INCREMENT;
+ struct connection **new_conns;
+
+ new_conns = kzalloc(sizeof(struct connection *) *
+ new_size, allocation);
+ if (!new_conns)
+ goto finish;
+
+ memcpy(new_conns, connections, sizeof(struct connection *) * conn_array_size);
+ conn_array_size = new_size;
+ kfree(connections);
+ connections = new_conns;
+
+ }
+
+ con = connections[nodeid];
+ if (con == NULL && allocation) {
+ con = kmem_cache_zalloc(con_cache, allocation);
+ if (!con)
+ goto finish;
+
+ con->nodeid = nodeid;
+ init_rwsem(&con->sock_sem);
+ INIT_LIST_HEAD(&con->writequeue);
+ spin_lock_init(&con->writequeue_lock);
+
+ connections[nodeid] = con;
+ }
+
+finish:
+ up(&connections_lock);
+ return con;
+}
+
+/* Data available on socket or listen socket received a connect */
+static void lowcomms_data_ready(struct sock *sk, int count_unused)
+{
+ struct connection *con = sock2con(sk);
+
+ atomic_inc(&con->waiting_requests);
+ if (test_and_set_bit(CF_READ_PENDING, &con->flags))
+ return;
+
+ spin_lock_bh(&read_sockets_lock);
+ list_add_tail(&con->read_list, &read_sockets);
+ spin_unlock_bh(&read_sockets_lock);
+
+ wake_up_interruptible(&lowcomms_recv_waitq);
+}
+
+static void lowcomms_write_space(struct sock *sk)
+{
+ struct connection *con = sock2con(sk);
+
+ if (test_and_set_bit(CF_WRITE_PENDING, &con->flags))
+ return;
+
+ spin_lock_bh(&write_sockets_lock);
+ list_add_tail(&con->write_list, &write_sockets);
+ spin_unlock_bh(&write_sockets_lock);
+
+ wake_up_interruptible(&lowcomms_send_waitq);
+}
+
+static inline void lowcomms_connect_sock(struct connection *con)
+{
+ if (test_and_set_bit(CF_CONNECT_PENDING, &con->flags))
+ return;
+
+ spin_lock_bh(&state_sockets_lock);
+ list_add_tail(&con->state_list, &state_sockets);
+ spin_unlock_bh(&state_sockets_lock);
+
+ wake_up_interruptible(&lowcomms_send_waitq);
+}
+
+static void lowcomms_state_change(struct sock *sk)
+{
+ if (sk->sk_state == TCP_ESTABLISHED)
+ lowcomms_write_space(sk);
+}
+
+/* Make a socket active */
+static int add_sock(struct socket *sock, struct connection *con)
+{
+ con->sock = sock;
+
+ /* Install a data_ready callback */
+ con->sock->sk->sk_data_ready = lowcomms_data_ready;
+ con->sock->sk->sk_write_space = lowcomms_write_space;
+ con->sock->sk->sk_state_change = lowcomms_state_change;
+
+ return 0;
+}
+
+/* Add the port number to an IP6 or 4 sockaddr and return the address
+ length */
+static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port,
+ int *addr_len)
+{
+ saddr->ss_family = dlm_local_addr.ss_family;
+ if (saddr->ss_family == AF_INET) {