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hugetlbfs: New huge_add_to_page_cache helper routine

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Currently, there is only a single place where hugetlbfs pages are added
to the page cache.  The new fallocate code be adding a second one, so
break the functionality out into its own helper.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Kravetz 2015-09-08 15:01:50 -07:00 committed by Linus Torvalds
parent d85f69b0b5
commit ab76ad540a
2 changed files with 20 additions and 9 deletions
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2
include/linux/hugetlb.h
View File

@ -333,6 +333,8 @@ struct huge_bootmem_page {
struct page *alloc_huge_page_node(struct hstate *h, int nid);
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
unsigned long addr, int avoid_reserve);
int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
pgoff_t idx);
/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

27
mm/hugetlb.c
View File

@ -3375,6 +3375,23 @@ static bool hugetlbfs_pagecache_present(struct hstate *h,
return page != NULL;
}
int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
pgoff_t idx)
{
struct inode *inode = mapping->host;
struct hstate *h = hstate_inode(inode);
int err = add_to_page_cache(page, mapping, idx, GFP_KERNEL);
if (err)
return err;
ClearPagePrivate(page);
spin_lock(&inode->i_lock);
inode->i_blocks += blocks_per_huge_page(h);
spin_unlock(&inode->i_lock);
return 0;
}
static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct address_space *mapping, pgoff_t idx,
unsigned long address, pte_t *ptep, unsigned int flags)
@ -3422,21 +3439,13 @@ retry:
set_page_huge_active(page);
if (vma->vm_flags & VM_MAYSHARE) {
int err;
struct inode *inode = mapping->host;
err = add_to_page_cache(page, mapping, idx, GFP_KERNEL);
int err = huge_add_to_page_cache(page, mapping, idx);
if (err) {
put_page(page);
if (err == -EEXIST)
goto retry;
goto out;
}
ClearPagePrivate(page);
spin_lock(&inode->i_lock);
inode->i_blocks += blocks_per_huge_page(h);
spin_unlock(&inode->i_lock);
} else {
lock_page(page);
if (unlikely(anon_vma_prepare(vma))) {