Re: [GIT PULL] dlm updates for 2.6.27

From: David Teigland
Date: Thu Jul 31 2008 - 11:14:08 EST

On Wed, Jul 30, 2008 at 09:35:56PM -0700, Andrew Morton wrote:
> On Mon, 28 Jul 2008 11:11:58 -0500 David Teigland <teigland@xxxxxxxxxx> wrote:
> Because there's already a `struct node' in include/linux/node.h.
>
> This is because some random unrelated patch
> (vmscan-unevictable-lru-scan-sysctl.patch) in -mm has caused
> include/linux/node.h to get included in the fs/dlm/config.c build on
> sparc32.
>
> `struct node' was a poor choice of name! Please rename it prior to the
> 2.6.27 release so that bisectability won't break if/when we merge
> vmscan-unevictable-lru-scan-sysctl.patch. Plus this bug might already
> be present in mainline, only nobody has yet found the config which
> triggers it.

Thanks, here's a patch. It prefixes all those configfs structures that
work together, to keep them uniform; the other names seemed a bit on the
common side, too.


From: David Teigland <teigland@xxxxxxxxxx>
Date: Thu, 31 Jul 2008 09:31:53 -0500
Subject: [PATCH] dlm: rename structs

Add a dlm_ prefix to the struct names in config.c. This resolves a
conflict with struct node in particular, when include/linux/node.h
happens to be included.

Reported-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: David Teigland <teigland@xxxxxxxxxx>
---
fs/dlm/config.c | 203 +++++++++++++++++++++++++++++--------------------------
1 files changed, 107 insertions(+), 96 deletions(-)

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index c4e7d72..89d2fb7 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -2,7 +2,7 @@
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2004-2008 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
@@ -30,16 +30,16 @@

static struct config_group *space_list;
static struct config_group *comm_list;
-static struct comm *local_comm;
+static struct dlm_comm *local_comm;

-struct clusters;
-struct cluster;
-struct spaces;
-struct space;
-struct comms;
-struct comm;
-struct nodes;
-struct node;
+struct dlm_clusters;
+struct dlm_cluster;
+struct dlm_spaces;
+struct dlm_space;
+struct dlm_comms;
+struct dlm_comm;
+struct dlm_nodes;
+struct dlm_node;

static struct config_group *make_cluster(struct config_group *, const char *);
static void drop_cluster(struct config_group *, struct config_item *);
@@ -68,17 +68,22 @@ static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
const char *buf, size_t len);

-static ssize_t comm_nodeid_read(struct comm *cm, char *buf);
-static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len);
-static ssize_t comm_local_read(struct comm *cm, char *buf);
-static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len);
-static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len);
-static ssize_t node_nodeid_read(struct node *nd, char *buf);
-static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
-static ssize_t node_weight_read(struct node *nd, char *buf);
-static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
-
-struct cluster {
+static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
+static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
+ size_t len);
+static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
+static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
+ size_t len);
+static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
+ size_t len);
+static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
+static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
+ size_t len);
+static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
+static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
+ size_t len);
+
+struct dlm_cluster {
struct config_group group;
unsigned int cl_tcp_port;
unsigned int cl_buffer_size;
@@ -109,11 +114,11 @@ enum {

struct cluster_attribute {
struct configfs_attribute attr;
- ssize_t (*show)(struct cluster *, char *);
- ssize_t (*store)(struct cluster *, const char *, size_t);
+ ssize_t (*show)(struct dlm_cluster *, char *);
+ ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
};

-static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
+static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
int *info_field, int check_zero,
const char *buf, size_t len)
{
@@ -134,12 +139,12 @@ static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
}

#define CLUSTER_ATTR(name, check_zero) \
-static ssize_t name##_write(struct cluster *cl, const char *buf, size_t len) \
+static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
{ \
return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
check_zero, buf, len); \
} \
-static ssize_t name##_read(struct cluster *cl, char *buf) \
+static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \
{ \
return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
} \
@@ -181,8 +186,8 @@ enum {

struct comm_attribute {
struct configfs_attribute attr;
- ssize_t (*show)(struct comm *, char *);
- ssize_t (*store)(struct comm *, const char *, size_t);
+ ssize_t (*show)(struct dlm_comm *, char *);
+ ssize_t (*store)(struct dlm_comm *, const char *, size_t);
};

static struct comm_attribute comm_attr_nodeid = {
@@ -222,8 +227,8 @@ enum {

struct node_attribute {
struct configfs_attribute attr;
- ssize_t (*show)(struct node *, char *);
- ssize_t (*store)(struct node *, const char *, size_t);
+ ssize_t (*show)(struct dlm_node *, char *);
+ ssize_t (*store)(struct dlm_node *, const char *, size_t);
};

static struct node_attribute node_attr_nodeid = {
@@ -248,26 +253,26 @@ static struct configfs_attribute *node_attrs[] = {
NULL,
};

-struct clusters {
+struct dlm_clusters {
struct configfs_subsystem subsys;
};

-struct spaces {
+struct dlm_spaces {
struct config_group ss_group;
};

-struct space {
+struct dlm_space {
struct config_group group;
struct list_head members;
struct mutex members_lock;
int members_count;
};

-struct comms {
+struct dlm_comms {
struct config_group cs_group;
};

-struct comm {
+struct dlm_comm {
struct config_item item;
int nodeid;
int local;
@@ -275,11 +280,11 @@ struct comm {
struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
};

-struct nodes {
+struct dlm_nodes {
struct config_group ns_group;
};

-struct node {
+struct dlm_node {
struct config_item item;
struct list_head list; /* space->members */
int nodeid;
@@ -372,38 +377,40 @@ static struct config_item_type node_type = {
.ct_owner = THIS_MODULE,
};

-static struct cluster *to_cluster(struct config_item *i)
+static struct dlm_cluster *to_cluster(struct config_item *i)
{
- return i ? container_of(to_config_group(i), struct cluster, group):NULL;
+ return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
+ NULL;
}

-static struct space *to_space(struct config_item *i)
+static struct dlm_space *to_space(struct config_item *i)
{
- return i ? container_of(to_config_group(i), struct space, group) : NULL;
+ return i ? container_of(to_config_group(i), struct dlm_space, group) :
+ NULL;
}

-static struct comm *to_comm(struct config_item *i)
+static struct dlm_comm *to_comm(struct config_item *i)
{
- return i ? container_of(i, struct comm, item) : NULL;
+ return i ? container_of(i, struct dlm_comm, item) : NULL;
}

-static struct node *to_node(struct config_item *i)
+static struct dlm_node *to_node(struct config_item *i)
{
- return i ? container_of(i, struct node, item) : NULL;
+ return i ? container_of(i, struct dlm_node, item) : NULL;
}

static struct config_group *make_cluster(struct config_group *g,
const char *name)
{
- struct cluster *cl = NULL;
- struct spaces *sps = NULL;
- struct comms *cms = NULL;
+ struct dlm_cluster *cl = NULL;
+ struct dlm_spaces *sps = NULL;
+ struct dlm_comms *cms = NULL;
void *gps = NULL;

- cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
+ cl = kzalloc(sizeof(struct dlm_cluster), GFP_KERNEL);
gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
- sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
- cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
+ sps = kzalloc(sizeof(struct dlm_spaces), GFP_KERNEL);
+ cms = kzalloc(sizeof(struct dlm_comms), GFP_KERNEL);

if (!cl || !gps || !sps || !cms)
goto fail;
@@ -443,7 +450,7 @@ static struct config_group *make_cluster(struct config_group *g,

static void drop_cluster(struct config_group *g, struct config_item *i)
{
- struct cluster *cl = to_cluster(i);
+ struct dlm_cluster *cl = to_cluster(i);
struct config_item *tmp;
int j;

@@ -461,20 +468,20 @@ static void drop_cluster(struct config_group *g, struct config_item *i)

static void release_cluster(struct config_item *i)
{
- struct cluster *cl = to_cluster(i);
+ struct dlm_cluster *cl = to_cluster(i);
kfree(cl->group.default_groups);
kfree(cl);
}

static struct config_group *make_space(struct config_group *g, const char *name)
{
- struct space *sp = NULL;
- struct nodes *nds = NULL;
+ struct dlm_space *sp = NULL;
+ struct dlm_nodes *nds = NULL;
void *gps = NULL;

- sp = kzalloc(sizeof(struct space), GFP_KERNEL);
+ sp = kzalloc(sizeof(struct dlm_space), GFP_KERNEL);
gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
- nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
+ nds = kzalloc(sizeof(struct dlm_nodes), GFP_KERNEL);

if (!sp || !gps || !nds)
goto fail;
@@ -500,7 +507,7 @@ static struct config_group *make_space(struct config_group *g, const char *name)

static void drop_space(struct config_group *g, struct config_item *i)
{
- struct space *sp = to_space(i);
+ struct dlm_space *sp = to_space(i);
struct config_item *tmp;
int j;

@@ -517,16 +524,16 @@ static void drop_space(struct config_group *g, struct config_item *i)

static void release_space(struct config_item *i)
{
- struct space *sp = to_space(i);
+ struct dlm_space *sp = to_space(i);
kfree(sp->group.default_groups);
kfree(sp);
}

static struct config_item *make_comm(struct config_group *g, const char *name)
{
- struct comm *cm;
+ struct dlm_comm *cm;

- cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
+ cm = kzalloc(sizeof(struct dlm_comm), GFP_KERNEL);
if (!cm)
return ERR_PTR(-ENOMEM);

@@ -539,7 +546,7 @@ static struct config_item *make_comm(struct config_group *g, const char *name)

static void drop_comm(struct config_group *g, struct config_item *i)
{
- struct comm *cm = to_comm(i);
+ struct dlm_comm *cm = to_comm(i);
if (local_comm == cm)
local_comm = NULL;
dlm_lowcomms_close(cm->nodeid);
@@ -550,16 +557,16 @@ static void drop_comm(struct config_group *g, struct config_item *i)

static void release_comm(struct config_item *i)
{
- struct comm *cm = to_comm(i);
+ struct dlm_comm *cm = to_comm(i);
kfree(cm);
}

static struct config_item *make_node(struct config_group *g, const char *name)
{
- struct space *sp = to_space(g->cg_item.ci_parent);
- struct node *nd;
+ struct dlm_space *sp = to_space(g->cg_item.ci_parent);
+ struct dlm_node *nd;

- nd = kzalloc(sizeof(struct node), GFP_KERNEL);
+ nd = kzalloc(sizeof(struct dlm_node), GFP_KERNEL);
if (!nd)
return ERR_PTR(-ENOMEM);

@@ -578,8 +585,8 @@ static struct config_item *make_node(struct config_group *g, const char *name)

static void drop_node(struct config_group *g, struct config_item *i)
{
- struct space *sp = to_space(g->cg_item.ci_parent);
- struct node *nd = to_node(i);
+ struct dlm_space *sp = to_space(g->cg_item.ci_parent);
+ struct dlm_node *nd = to_node(i);

mutex_lock(&sp->members_lock);
list_del(&nd->list);
@@ -591,11 +598,11 @@ static void drop_node(struct config_group *g, struct config_item *i)

static void release_node(struct config_item *i)
{
- struct node *nd = to_node(i);
+ struct dlm_node *nd = to_node(i);
kfree(nd);
}

-static struct clusters clusters_root = {
+static struct dlm_clusters clusters_root = {
.subsys = {
.su_group = {
.cg_item = {
@@ -625,7 +632,7 @@ void dlm_config_exit(void)
static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
char *buf)
{
- struct cluster *cl = to_cluster(i);
+ struct dlm_cluster *cl = to_cluster(i);
struct cluster_attribute *cla =
container_of(a, struct cluster_attribute, attr);
return cla->show ? cla->show(cl, buf) : 0;
@@ -635,7 +642,7 @@ static ssize_t store_cluster(struct config_item *i,
struct configfs_attribute *a,
const char *buf, size_t len)
{
- struct cluster *cl = to_cluster(i);
+ struct dlm_cluster *cl = to_cluster(i);
struct cluster_attribute *cla =
container_of(a, struct cluster_attribute, attr);
return cla->store ? cla->store(cl, buf, len) : -EINVAL;
@@ -644,7 +651,7 @@ static ssize_t store_cluster(struct config_item *i,
static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
char *buf)
{
- struct comm *cm = to_comm(i);
+ struct dlm_comm *cm = to_comm(i);
struct comm_attribute *cma =
container_of(a, struct comm_attribute, attr);
return cma->show ? cma->show(cm, buf) : 0;
@@ -653,29 +660,31 @@ static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
const char *buf, size_t len)
{
- struct comm *cm = to_comm(i);
+ struct dlm_comm *cm = to_comm(i);
struct comm_attribute *cma =
container_of(a, struct comm_attribute, attr);
return cma->store ? cma->store(cm, buf, len) : -EINVAL;
}

-static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
+static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
{
return sprintf(buf, "%d\n", cm->nodeid);
}

-static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
+static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
+ size_t len)
{
cm->nodeid = simple_strtol(buf, NULL, 0);
return len;
}

-static ssize_t comm_local_read(struct comm *cm, char *buf)
+static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
{
return sprintf(buf, "%d\n", cm->local);
}

-static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
+static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
+ size_t len)
{
cm->local= simple_strtol(buf, NULL, 0);
if (cm->local && !local_comm)
@@ -683,7 +692,7 @@ static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
return len;
}

-static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
+static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
{
struct sockaddr_storage *addr;

@@ -705,7 +714,7 @@ static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
char *buf)
{
- struct node *nd = to_node(i);
+ struct dlm_node *nd = to_node(i);
struct node_attribute *nda =
container_of(a, struct node_attribute, attr);
return nda->show ? nda->show(nd, buf) : 0;
@@ -714,29 +723,31 @@ static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
const char *buf, size_t len)
{
- struct node *nd = to_node(i);
+ struct dlm_node *nd = to_node(i);
struct node_attribute *nda =
container_of(a, struct node_attribute, attr);
return nda->store ? nda->store(nd, buf, len) : -EINVAL;
}

-static ssize_t node_nodeid_read(struct node *nd, char *buf)
+static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
{
return sprintf(buf, "%d\n", nd->nodeid);
}

-static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
+static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
+ size_t len)
{
nd->nodeid = simple_strtol(buf, NULL, 0);
return len;
}

-static ssize_t node_weight_read(struct node *nd, char *buf)
+static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
{
return sprintf(buf, "%d\n", nd->weight);
}

-static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
+static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
+ size_t len)
{
nd->weight = simple_strtol(buf, NULL, 0);
return len;
@@ -746,7 +757,7 @@ static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
* Functions for the dlm to get the info that's been configured
*/

-static struct space *get_space(char *name)
+static struct dlm_space *get_space(char *name)
{
struct config_item *i;

@@ -760,15 +771,15 @@ static struct space *get_space(char *name)
return to_space(i);
}

-static void put_space(struct space *sp)
+static void put_space(struct dlm_space *sp)
{
config_item_put(&sp->group.cg_item);
}

-static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
+static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
{
struct config_item *i;
- struct comm *cm = NULL;
+ struct dlm_comm *cm = NULL;
int found = 0;

if (!comm_list)
@@ -801,7 +812,7 @@ static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
return cm;
}

-static void put_comm(struct comm *cm)
+static void put_comm(struct dlm_comm *cm)
{
config_item_put(&cm->item);
}
@@ -810,8 +821,8 @@ static void put_comm(struct comm *cm)
int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
int **new_out, int *new_count_out)
{
- struct space *sp;
- struct node *nd;
+ struct dlm_space *sp;
+ struct dlm_node *nd;
int i = 0, rv = 0, ids_count = 0, new_count = 0;
int *ids, *new;

@@ -874,8 +885,8 @@ int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,

int dlm_node_weight(char *lsname, int nodeid)
{
- struct space *sp;
- struct node *nd;
+ struct dlm_space *sp;
+ struct dlm_node *nd;
int w = -EEXIST;

sp = get_space(lsname);
@@ -897,7 +908,7 @@ int dlm_node_weight(char *lsname, int nodeid)

int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
{
- struct comm *cm = get_comm(nodeid, NULL);
+ struct dlm_comm *cm = get_comm(nodeid, NULL);
if (!cm)
return -EEXIST;
if (!cm->addr_count)
@@ -909,7 +920,7 @@ int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)

int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
{
- struct comm *cm = get_comm(0, addr);
+ struct dlm_comm *cm = get_comm(0, addr);
if (!cm)
return -EEXIST;
*nodeid = cm->nodeid;
--
1.5.5.1

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