1 files changed, 32 insertions, 25 deletions

diff --git a/mm/shmem.c b/mm/shmem.c
index 3c620dc10135..e6d9298aa22a 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1079,23 +1079,29 @@ redirty:
 
 #ifdef CONFIG_NUMA
 #ifdef CONFIG_TMPFS
-static void shmem_show_mpol(struct seq_file *seq, unsigned short mode,
-                        unsigned short flags, const nodemask_t policy_nodes)
+static void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
 {
-        struct mempolicy temp;
         char buffer[64];
 
-        if (mode == MPOL_DEFAULT)
+        if (!mpol || mpol->mode == MPOL_DEFAULT)
                 return;         /* show nothing */
 
-        temp.mode = mode;
-        temp.flags = flags;
-        temp.v.nodes = policy_nodes;
-
-        mpol_to_str(buffer, sizeof(buffer), &temp);
+        mpol_to_str(buffer, sizeof(buffer), mpol, 1);
 
         seq_printf(seq, ",mpol=%s", buffer);
 }
+
+static struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)
+{
+        struct mempolicy *mpol = NULL;
+        if (sbinfo->mpol) {
+                spin_lock(&sbinfo->stat_lock);  /* prevent replace/use races */
+                mpol = sbinfo->mpol;
+                mpol_get(mpol);
+                spin_unlock(&sbinfo->stat_lock);
+        }
+        return mpol;
+}
 #endif /* CONFIG_TMPFS */
 
 static struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp,
@@ -1135,8 +1141,7 @@ static struct page *shmem_alloc_page(gfp_t gfp,
 }
 #else /* !CONFIG_NUMA */
 #ifdef CONFIG_TMPFS
-static inline void shmem_show_mpol(struct seq_file *seq, unsigned short policy,
-                        unsigned short flags, const nodemask_t policy_nodes)
+static inline void shmem_show_mpol(struct seq_file *seq, struct mempolicy *p)
 {
 }
 #endif /* CONFIG_TMPFS */
@@ -1154,6 +1159,13 @@ static inline struct page *shmem_alloc_page(gfp_t gfp,
 }
 #endif /* CONFIG_NUMA */
 
+#if !defined(CONFIG_NUMA) || !defined(CONFIG_TMPFS)
+static inline struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)
+{
+        return NULL;
+}
+#endif
+
 /*
  * shmem_getpage - either get the page from swap or allocate a new one
  *
@@ -1508,8 +1520,8 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
                 case S_IFREG:
                         inode->i_op = &shmem_inode_operations;
                         inode->i_fop = &shmem_file_operations;
-                        mpol_shared_policy_init(&info->policy, sbinfo->policy,
-                                        sbinfo->flags, &sbinfo->policy_nodes);
+                        mpol_shared_policy_init(&info->policy,
+                                                 shmem_get_sbmpol(sbinfo));
                         break;
                 case S_IFDIR:
                         inc_nlink(inode);
@@ -1523,8 +1535,7 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
                          * Must not load anything in the rbtree,
                          * mpol_free_shared_policy will not be called.
                          */
-                        mpol_shared_policy_init(&info->policy, MPOL_DEFAULT, 0,
-                                                NULL);
+                        mpol_shared_policy_init(&info->policy, NULL);
                         break;
                 }
         } else
@@ -2139,8 +2150,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
                         if (*rest)
                                 goto bad_val;
                 } else if (!strcmp(this_char,"mpol")) {
-                        if (mpol_parse_str(value, &sbinfo->policy,
-                                         &sbinfo->flags, &sbinfo->policy_nodes))
+                        if (mpol_parse_str(value, &sbinfo->mpol, 1))
                                 goto bad_val;
                 } else {
                         printk(KERN_ERR "tmpfs: Bad mount option %s\n",
@@ -2191,9 +2201,9 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
         sbinfo->free_blocks = config.max_blocks - blocks;
         sbinfo->max_inodes  = config.max_inodes;
         sbinfo->free_inodes = config.max_inodes - inodes;
-        sbinfo->policy      = config.policy;
-        sbinfo->flags       = config.flags;
-        sbinfo->policy_nodes = config.policy_nodes;
+
+        mpol_put(sbinfo->mpol);
+        sbinfo->mpol        = config.mpol;      /* transfers initial ref */
 out:
         spin_unlock(&sbinfo->stat_lock);
         return error;
@@ -2214,8 +2224,7 @@ static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs)
                 seq_printf(seq, ",uid=%u", sbinfo->uid);
         if (sbinfo->gid != 0)
                 seq_printf(seq, ",gid=%u", sbinfo->gid);
-        shmem_show_mpol(seq, sbinfo->policy, sbinfo->flags,
-                        sbinfo->policy_nodes);
+        shmem_show_mpol(seq, sbinfo->mpol);
         return 0;
 }
 #endif /* CONFIG_TMPFS */
@@ -2245,9 +2254,7 @@ static int shmem_fill_super(struct super_block *sb,
         sbinfo->mode = S_IRWXUGO | S_ISVTX;
         sbinfo->uid = current->fsuid;
         sbinfo->gid = current->fsgid;
-        sbinfo->policy = MPOL_DEFAULT;
-        sbinfo->flags = 0;
-        sbinfo->policy_nodes = node_states[N_HIGH_MEMORY];
+        sbinfo->mpol = NULL;
         sb->s_fs_info = sbinfo;
 
 #ifdef CONFIG_TMPFS