hugetlb: allow bulk updating in hugetlb_*_quota()

Add a second parameter 'delta' to hugetlb_get_quota and hugetlb_put_quota to
allow bulk updating of the sbinfo->free_blocks counter.  This will be used by
the next patch in the series.

Signed-off-by: Adam Litke <agl@us.ibm.com>
Cc: Ken Chen <kenchen@google.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: David Gibson <hermes@gibson.dropbear.id.au>
Cc: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 6513f56..09ee07f 100644 (file)
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -858,15 +858,15 @@ out_free:
        return -ENOMEM;
 }
 
-int hugetlb_get_quota(struct address_space *mapping)
+int hugetlb_get_quota(struct address_space *mapping, long delta)
 {
        int ret = 0;
        struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb);
 
        if (sbinfo->free_blocks > -1) {
                spin_lock(&sbinfo->stat_lock);
-               if (sbinfo->free_blocks > 0)
-                       sbinfo->free_blocks--;
+               if (sbinfo->free_blocks - delta >= 0)
+                       sbinfo->free_blocks -= delta;
                else
                        ret = -ENOMEM;
                spin_unlock(&sbinfo->stat_lock);
@@ -875,13 +875,13 @@ int hugetlb_get_quota(struct address_space *mapping)
        return ret;
 }
 
-void hugetlb_put_quota(struct address_space *mapping)
+void hugetlb_put_quota(struct address_space *mapping, long delta)
 {
        struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb);
 
        if (sbinfo->free_blocks > -1) {
                spin_lock(&sbinfo->stat_lock);
-               sbinfo->free_blocks++;
+               sbinfo->free_blocks += delta;
                spin_unlock(&sbinfo->stat_lock);
        }
 }

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index e223686..8104e5a 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -165,8 +165,8 @@ static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 extern const struct file_operations hugetlbfs_file_operations;
 extern struct vm_operations_struct hugetlb_vm_ops;
 struct file *hugetlb_file_setup(const char *name, size_t);
-int hugetlb_get_quota(struct address_space *mapping);
-void hugetlb_put_quota(struct address_space *mapping);
+int hugetlb_get_quota(struct address_space *mapping, long delta);
+void hugetlb_put_quota(struct address_space *mapping, long delta);
 
 static inline int is_file_hugepages(struct file *file)
 {

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bc12b0a..1e31746 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -132,7 +132,7 @@ static void free_huge_page(struct page *page)
        }
        spin_unlock(&hugetlb_lock);
        if (mapping)
-               hugetlb_put_quota(mapping);
+               hugetlb_put_quota(mapping, 1);
        set_page_private(page, 0);
 }
 
@@ -390,7 +390,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
        struct page *page;
        struct address_space *mapping = vma->vm_file->f_mapping;
 
-       if (hugetlb_get_quota(mapping))
+       if (hugetlb_get_quota(mapping, 1))
                return ERR_PTR(-VM_FAULT_SIGBUS);
 
        if (vma->vm_flags & VM_MAYSHARE)