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hugetlb: fix i_blocks accounting

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For administrative purpose, we want to query actual block usage for
hugetlbfs file via fstat.  Currently, hugetlbfs always return 0.  Fix that
up since kernel already has all the information to track it properly.

Signed-off-by: Ken Chen <kenchen@google.com>
Acked-by: Adam Litke <agl@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ken Chen 2007-11-14 16:59:44 -08:00 committed by Linus Torvalds
parent 8cde045c7e
commit 45c682a68a
2 changed files with 12 additions and 0 deletions
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2
include/linux/hugetlb.h
View file

@ -168,6 +168,8 @@ struct file *hugetlb_file_setup(const char *name, size_t);
int hugetlb_get_quota(struct address_space *mapping, long delta);
void hugetlb_put_quota(struct address_space *mapping, long delta);
#define BLOCKS_PER_HUGEPAGE (HPAGE_SIZE / 512)
static inline int is_file_hugepages(struct file *file)
{
if (file->f_op == &hugetlbfs_file_operations)

10
mm/hugetlb.c
View file

@ -801,6 +801,7 @@ static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (vma->vm_flags & VM_SHARED) {
int err;
struct inode *inode = mapping->host;
err = add_to_page_cache(page, mapping, idx, GFP_KERNEL);
if (err) {
@ -809,6 +810,10 @@ static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto retry;
goto out;
}
spin_lock(&inode->i_lock);
inode->i_blocks += BLOCKS_PER_HUGEPAGE;
spin_unlock(&inode->i_lock);
} else
lock_page(page);
}
@ -1160,6 +1165,11 @@ int hugetlb_reserve_pages(struct inode *inode, long from, long to)
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)
{
long chg = region_truncate(&inode->i_mapping->private_list, offset);
spin_lock(&inode->i_lock);
inode->i_blocks -= BLOCKS_PER_HUGEPAGE * freed;
spin_unlock(&inode->i_lock);
hugetlb_put_quota(inode->i_mapping, (chg - freed));
hugetlb_acct_memory(-(chg - freed));
}