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Introduce md_cluster_info

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md_cluster_info stores the cluster information in the MD device.

The join() is called when mddev detects it is a clustered device.
The main responsibilities are:
	1. Setup a DLM lockspace
	2. Setup all initial locks such as super block locks and bitmap lock (will come later)

The leave() clears up the lockspace and all the locks held.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
This commit is contained in:
Goldwyn Rodrigues
2014-03-29 10:20:02 -05:00
parent edb39c9ded
commit c4ce867fda
4 changed files with 80 additions and 4 deletions
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65
drivers/md/md-cluster.c
View File

@@ -22,8 +22,16 @@ struct dlm_lock_resource {
struct dlm_lksb lksb;
char *name; /* lock name. */
uint32_t flags; /* flags to pass to dlm_lock() */
void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
struct completion completion; /* completion for synchronized locking */
void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
struct mddev *mddev; /* pointing back to mddev. */
};
struct md_cluster_info {
/* dlm lock space and resources for clustered raid. */
dlm_lockspace_t *lockspace;
struct dlm_lock_resource *sb_lock;
struct mutex sb_mutex;
};
static void sync_ast(void *arg)
@@ -53,16 +61,18 @@ static int dlm_unlock_sync(struct dlm_lock_resource *res)
return dlm_lock_sync(res, DLM_LOCK_NL);
}
static struct dlm_lock_resource *lockres_init(dlm_lockspace_t *lockspace,
static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
{
struct dlm_lock_resource *res = NULL;
int ret, namelen;
struct md_cluster_info *cinfo = mddev->cluster_info;
res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
if (!res)
return NULL;
res->ls = lockspace;
res->ls = cinfo->lockspace;
res->mddev = mddev;
namelen = strlen(name);
res->name = kzalloc(namelen + 1, GFP_KERNEL);
if (!res->name) {
@@ -114,13 +124,62 @@ static void lockres_free(struct dlm_lock_resource *res)
kfree(res);
}
static char *pretty_uuid(char *dest, char *src)
{
int i, len = 0;
for (i = 0; i < 16; i++) {
if (i == 4 || i == 6 || i == 8 || i == 10)
len += sprintf(dest + len, "-");
len += sprintf(dest + len, "%02x", (__u8)src[i]);
}
return dest;
}
static int join(struct mddev *mddev, int nodes)
{
struct md_cluster_info *cinfo;
int ret;
char str[64];
if (!try_module_get(THIS_MODULE))
return -ENOENT;
cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
if (!cinfo)
return -ENOMEM;
memset(str, 0, 64);
pretty_uuid(str, mddev->uuid);
ret = dlm_new_lockspace(str, NULL, DLM_LSFL_FS, LVB_SIZE,
NULL, NULL, NULL, &cinfo->lockspace);
if (ret)
goto err;
cinfo->sb_lock = lockres_init(mddev, "cmd-super",
NULL, 0);
if (!cinfo->sb_lock) {
ret = -ENOMEM;
goto err;
}
mutex_init(&cinfo->sb_mutex);
mddev->cluster_info = cinfo;
return 0;
err:
if (cinfo->lockspace)
dlm_release_lockspace(cinfo->lockspace, 2);
kfree(cinfo);
module_put(THIS_MODULE);
return ret;
}
static int leave(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
if (!cinfo)
return 0;
lockres_free(cinfo->sb_lock);
dlm_release_lockspace(cinfo->lockspace, 2);
return 0;
}