[DLM] variable allocation

Add a new flag, DLM_LSFL_FS, to be used when a file system creates a lockspace.
This flag causes the dlm to use GFP_NOFS for allocations instead of GFP_KERNEL.
(This updated version of the patch uses gfp_t for ls_allocation.)

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-Off-By: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

6 files changed, 14 insertions, 6 deletions

diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index f2c85493c0c6..8ac081882c78 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -463,6 +463,7 @@ struct dlm_ls {
         int                     ls_low_nodeid;
         int                     ls_total_weight;
         int                     *ls_node_array;
+        gfp_t                   ls_allocation;
 
         struct dlm_rsb          ls_stub_rsb;    /* for returning errors */
         struct dlm_lkb          ls_stub_lkb;    /* for returning errors */
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index de943afacb37..b455919c1998 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -2594,7 +2594,7 @@ static int _create_message(struct dlm_ls *ls, int mb_len,
            pass into lowcomms_commit and a message buffer (mb) that we
            write our data into */
 
-        mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_KERNEL, &mb);
+        mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, ls->ls_allocation, &mb);
         if (!mh)
                 return -ENOBUFS;
 
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index c8f0c15ac166..6802653473d1 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -444,6 +444,11 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
                 set_bit(LSFL_TIMEWARN, &ls->ls_flags);
         ls->ls_exflags = (flags & ~DLM_LSFL_TIMEWARN);
 
+        if (flags & DLM_LSFL_FS)
+                ls->ls_allocation = GFP_NOFS;
+        else
+                ls->ls_allocation = GFP_KERNEL;
+
         size = dlm_config.ci_rsbtbl_size;
         ls->ls_rsbtbl_size = size;
 
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index f71c23542f0f..e3a1527cbdbe 100644
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -38,7 +38,7 @@ static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
         char *mb;
         int mb_len = sizeof(struct dlm_rcom) + len;
 
-        mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_KERNEL, &mb);
+        mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, ls->ls_allocation, &mb);
         if (!mh) {
                 log_print("create_rcom to %d type %d len %d ENOBUFS",
                           to_nodeid, type, len);
@@ -386,7 +386,8 @@ static void receive_rcom_lock_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
         dlm_recover_process_copy(ls, rc_in);
 }
 
-static int send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
+static int send_ls_not_ready(struct dlm_ls *ls, int nodeid,
+                             struct dlm_rcom *rc_in)
 {
         struct dlm_rcom *rc;
         struct rcom_config *rf;
@@ -394,7 +395,7 @@ static int send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
         char *mb;
         int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
 
-        mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_KERNEL, &mb);
+        mh = dlm_lowcomms_get_buffer(nodeid, mb_len, ls->ls_allocation, &mb);
         if (!mh)
                 return -ENOBUFS;
         memset(mb, 0, mb_len);
@@ -464,7 +465,7 @@ void dlm_receive_rcom(struct dlm_header *hd, int nodeid)
                 log_print("lockspace %x from %d type %x not found",
                           hd->h_lockspace, nodeid, rc->rc_type);
                 if (rc->rc_type == DLM_RCOM_STATUS)
-                        send_ls_not_ready(nodeid, rc);
+                        send_ls_not_ready(ls, nodeid, rc);
                 return;
         }
 
diff --git a/fs/gfs2/locking/dlm/mount.c b/fs/gfs2/locking/dlm/mount.c
index 1d8faa3da8af..41c5b04caaba 100644
--- a/fs/gfs2/locking/dlm/mount.c
+++ b/fs/gfs2/locking/dlm/mount.c
@@ -147,7 +147,7 @@ static int gdlm_mount(char *table_name, char *host_data,
 
         error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
                                   &ls->dlm_lockspace,
-                                  nodir ? DLM_LSFL_NODIR : 0,
+                                  DLM_LSFL_FS | (nodir ? DLM_LSFL_NODIR : 0),
                                   GDLM_LVB_SIZE);
         if (error) {
                 log_error("dlm_new_lockspace error %d", error);
diff --git a/include/linux/dlm.h b/include/linux/dlm.h
index 5227a9594f9d..be9d278761e0 100644
--- a/include/linux/dlm.h
+++ b/include/linux/dlm.h
@@ -206,6 +206,7 @@ struct dlm_lksb {
 
 #define DLM_LSFL_NODIR          0x00000001
 #define DLM_LSFL_TIMEWARN       0x00000002
+#define DLM_LSFL_FS             0x00000004
 
 #ifdef __KERNEL__