ocfs2: Separate out dlm lock functions.

This is the first in a series of patches to isolate ocfs2 from the
underlying cluster stack. Here we wrap the dlm locking functions with
ocfs2-specific calls. Because ocfs2 always uses the same dlm lock status
callbacks, we can eliminate the callbacks from the filesystem visible
functions.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 61 insertions, 49 deletions

diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 15a5167e051..aea3bef1917 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -53,6 +53,7 @@
 #include "heartbeat.h"
 #include "inode.h"
 #include "journal.h"
+#include "stackglue.h"
 #include "slot_map.h"
 #include "super.h"
 #include "uptodate.h"
@@ -888,22 +889,21 @@ static int ocfs2_lock_create(struct ocfs2_super *osb,
         lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
         spin_unlock_irqrestore(&lockres->l_lock, flags);
 
-        status = dlmlock(osb->dlm,
-                         level,
-                         &lockres->l_lksb,
-                         dlm_flags,
-                         lockres->l_name,
-                         OCFS2_LOCK_ID_MAX_LEN - 1,
-                         ocfs2_locking_ast,
-                         lockres,
-                         ocfs2_blocking_ast);
+        status = ocfs2_dlm_lock(osb->dlm,
+                                level,
+                                &lockres->l_lksb,
+                                dlm_flags,
+                                lockres->l_name,
+                                OCFS2_LOCK_ID_MAX_LEN - 1,
+                                lockres);
         if (status != DLM_NORMAL) {
-                ocfs2_log_dlm_error("dlmlock", status, lockres);
+                ocfs2_log_dlm_error("ocfs2_dlm_lock", status, lockres);
                 ret = -EINVAL;
                 ocfs2_recover_from_dlm_error(lockres, 1);
         }
 
-        mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name);
+        mlog(0, "lock %s, successfull return from ocfs2_dlm_lock\n",
+             lockres->l_name);
 
 bail:
         mlog_exit(ret);
@@ -1091,29 +1091,27 @@ again:
                      lockres->l_name, lockres->l_level, level);
 
                 /* call dlm_lock to upgrade lock now */
-                status = dlmlock(osb->dlm,
-                                 level,
-                                 &lockres->l_lksb,
-                                 lkm_flags,
-                                 lockres->l_name,
-                                 OCFS2_LOCK_ID_MAX_LEN - 1,
-                                 ocfs2_locking_ast,
-                                 lockres,
-                                 ocfs2_blocking_ast);
+                status = ocfs2_dlm_lock(osb->dlm,
+                                        level,
+                                        &lockres->l_lksb,
+                                        lkm_flags,
+                                        lockres->l_name,
+                                        OCFS2_LOCK_ID_MAX_LEN - 1,
+                                        lockres);
                 if (status != DLM_NORMAL) {
                         if ((lkm_flags & LKM_NOQUEUE) &&
                             (status == DLM_NOTQUEUED))
                                 ret = -EAGAIN;
                         else {
-                                ocfs2_log_dlm_error("dlmlock", status,
-                                                    lockres);
+                                ocfs2_log_dlm_error("ocfs2_dlm_lock",
+                                                    status, lockres);
                                 ret = -EINVAL;
                         }
                         ocfs2_recover_from_dlm_error(lockres, 1);
                         goto out;
                 }
 
-                mlog(0, "lock %s, successfull return from dlmlock\n",
+                mlog(0, "lock %s, successfull return from ocfs2_dlm_lock\n",
                      lockres->l_name);
 
                 /* At this point we've gone inside the dlm and need to
@@ -1503,14 +1501,14 @@ int ocfs2_file_lock(struct file *file, int ex, int trylock)
         lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
         spin_unlock_irqrestore(&lockres->l_lock, flags);
 
-        ret = dlmlock(osb->dlm, level, &lockres->l_lksb, lkm_flags,
-                      lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1,
-                      ocfs2_locking_ast, lockres, ocfs2_blocking_ast);
+        ret = ocfs2_dlm_lock(osb->dlm, level, &lockres->l_lksb, lkm_flags,
+                             lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1,
+                             lockres);
         if (ret != DLM_NORMAL) {
                 if (trylock && ret == DLM_NOTQUEUED)
                         ret = -EAGAIN;
                 else {
-                        ocfs2_log_dlm_error("dlmlock", ret, lockres);
+                        ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
                         ret = -EINVAL;
                 }
 
@@ -2699,15 +2697,15 @@ static int ocfs2_drop_lock(struct ocfs2_super *osb,
 
         mlog(0, "lock %s\n", lockres->l_name);
 
-        status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags,
-                           ocfs2_unlock_ast, lockres);
+        status = ocfs2_dlm_unlock(osb->dlm, &lockres->l_lksb, lkm_flags,
+                                  lockres);
         if (status != DLM_NORMAL) {
-                ocfs2_log_dlm_error("dlmunlock", status, lockres);
+                ocfs2_log_dlm_error("ocfs2_dlm_unlock", status, lockres);
                 mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
                 dlm_print_one_lock(lockres->l_lksb.lockid);
                 BUG();
         }
-        mlog(0, "lock %s, successfull return from dlmunlock\n",
+        mlog(0, "lock %s, successfull return from ocfs2_dlm_unlock\n",
              lockres->l_name);
 
         ocfs2_wait_on_busy_lock(lockres);
@@ -2832,17 +2830,15 @@ static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
         if (lvb)
                 dlm_flags |= LKM_VALBLK;
 
-        status = dlmlock(osb->dlm,
-                         new_level,
-                         &lockres->l_lksb,
-                         dlm_flags,
-                         lockres->l_name,
-                         OCFS2_LOCK_ID_MAX_LEN - 1,
-                         ocfs2_locking_ast,
-                         lockres,
-                         ocfs2_blocking_ast);
+        status = ocfs2_dlm_lock(osb->dlm,
+                                new_level,
+                                &lockres->l_lksb,
+                                dlm_flags,
+                                lockres->l_name,
+                                OCFS2_LOCK_ID_MAX_LEN - 1,
+                                lockres);
         if (status != DLM_NORMAL) {
-                ocfs2_log_dlm_error("dlmlock", status, lockres);
+                ocfs2_log_dlm_error("ocfs2_dlm_lock", status, lockres);
                 ret = -EINVAL;
                 ocfs2_recover_from_dlm_error(lockres, 1);
                 goto bail;
@@ -2854,7 +2850,7 @@ bail:
         return ret;
 }
 
-/* returns 1 when the caller should unlock and call dlmunlock */
+/* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */
 static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
                                         struct ocfs2_lock_res *lockres)
 {
@@ -2896,18 +2892,17 @@ static int ocfs2_cancel_convert(struct ocfs2_super *osb,
         mlog(0, "lock %s\n", lockres->l_name);
 
         ret = 0;
-        status = dlmunlock(osb->dlm,
-                           &lockres->l_lksb,
-                           LKM_CANCEL,
-                           ocfs2_unlock_ast,
-                           lockres);
+        status = ocfs2_dlm_unlock(osb->dlm,
+                                  &lockres->l_lksb,
+                                  LKM_CANCEL,
+                                  lockres);
         if (status != DLM_NORMAL) {
-                ocfs2_log_dlm_error("dlmunlock", status, lockres);
+                ocfs2_log_dlm_error("ocfs2_dlm_unlock", status, lockres);
                 ret = -EINVAL;
                 ocfs2_recover_from_dlm_error(lockres, 0);
         }
 
-        mlog(0, "lock %s return from dlmunlock\n", lockres->l_name);
+        mlog(0, "lock %s return from ocfs2_dlm_unlock\n", lockres->l_name);
 
         mlog_exit(ret);
         return ret;
@@ -3211,6 +3206,23 @@ static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
         return UNBLOCK_CONTINUE_POST;
 }
 
+static struct ocfs2_locking_protocol lproto = {
+        .lp_lock_ast            = ocfs2_locking_ast,
+        .lp_blocking_ast        = ocfs2_blocking_ast,
+        .lp_unlock_ast          = ocfs2_unlock_ast,
+};
+
+/* This interface isn't the final one, hence the less-than-perfect names */
+void dlmglue_init_stack(void)
+{
+        o2cb_get_stack(&lproto);
+}
+
+void dlmglue_exit_stack(void)
+{
+        o2cb_put_stack();
+}
+
 static void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
                                        struct ocfs2_lock_res *lockres)
 {