[DLM] The core of the DLM for GFS2/CLVM

This is the core of the distributed lock manager which is required
to use GFS2 as a cluster filesystem. It is also used by CLVM and
can be used as a standalone lock manager independantly of either
of these two projects.

It implements VAX-style locking modes.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steve Whitehouse <swhiteho@redhat.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
new file mode 100644
index 000000000000..0b9851d0bdb2
--- /dev/null
+++ b/fs/dlm/memory.c
@@ -0,0 +1,122 @@
+/******************************************************************************
+*******************************************************************************
+**
+**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
+**  Copyright (C) 2004-2005 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.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "config.h"
+#include "memory.h"
+
+static kmem_cache_t *lkb_cache;
+
+
+int dlm_memory_init(void)
+{
+        int ret = 0;
+
+        lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb),
+                                __alignof__(struct dlm_lkb), 0, NULL, NULL);
+        if (!lkb_cache)
+                ret = -ENOMEM;
+        return ret;
+}
+
+void dlm_memory_exit(void)
+{
+        if (lkb_cache)
+                kmem_cache_destroy(lkb_cache);
+}
+
+char *allocate_lvb(struct dlm_ls *ls)
+{
+        char *p;
+
+        p = kmalloc(ls->ls_lvblen, GFP_KERNEL);
+        if (p)
+                memset(p, 0, ls->ls_lvblen);
+        return p;
+}
+
+void free_lvb(char *p)
+{
+        kfree(p);
+}
+
+uint64_t *allocate_range(struct dlm_ls *ls)
+{
+        int ralen = 4*sizeof(uint64_t);
+        uint64_t *p;
+
+        p = kmalloc(ralen, GFP_KERNEL);
+        if (p)
+                memset(p, 0, ralen);
+        return p;
+}
+
+void free_range(uint64_t *p)
+{
+        kfree(p);
+}
+
+/* FIXME: have some minimal space built-in to rsb for the name and
+   kmalloc a separate name if needed, like dentries are done */
+
+struct dlm_rsb *allocate_rsb(struct dlm_ls *ls, int namelen)
+{
+        struct dlm_rsb *r;
+
+        DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,);
+
+        r = kmalloc(sizeof(*r) + namelen, GFP_KERNEL);
+        if (r)
+                memset(r, 0, sizeof(*r) + namelen);
+        return r;
+}
+
+void free_rsb(struct dlm_rsb *r)
+{
+        if (r->res_lvbptr)
+                free_lvb(r->res_lvbptr);
+        kfree(r);
+}
+
+struct dlm_lkb *allocate_lkb(struct dlm_ls *ls)
+{
+        struct dlm_lkb *lkb;
+
+        lkb = kmem_cache_alloc(lkb_cache, GFP_KERNEL);
+        if (lkb)
+                memset(lkb, 0, sizeof(*lkb));
+        return lkb;
+}
+
+void free_lkb(struct dlm_lkb *lkb)
+{
+        kmem_cache_free(lkb_cache, lkb);
+}
+
+struct dlm_direntry *allocate_direntry(struct dlm_ls *ls, int namelen)
+{
+        struct dlm_direntry *de;
+
+        DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,);
+
+        de = kmalloc(sizeof(*de) + namelen, GFP_KERNEL);
+        if (de)
+                memset(de, 0, sizeof(*de) + namelen);
+        return de;
+}
+
+void free_direntry(struct dlm_direntry *de)
+{
+        kfree(de);
+}
+