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-rw-r--r--mm/shmem.c57
1 files changed, 32 insertions, 25 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 3c620dc1013..e6d9298aa22 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