From 40716e29243de46720e5773797791466c28904ec Mon Sep 17 00:00:00 2001 From: Steven Truelove Date: Wed, 21 Mar 2012 16:34:14 -0700 Subject: hugetlbfs: fix alignment of huge page requests When calling shmget() with SHM_HUGETLB, shmget aligns the request size to PAGE_SIZE, but this is not sufficient. Modify hugetlb_file_setup() to align requests to the huge page size, and to accept an address argument so that all alignment checks can be performed in hugetlb_file_setup(), rather than in its callers. Change newseg() and mmap_pgoff() to match the new prototype and eliminate a now redundant alignment check. [akpm@linux-foundation.org: fix build] Signed-off-by: Steven Truelove Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/hugetlbfs/inode.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'fs/hugetlbfs/inode.c') diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 79408159a001..631329f3de63 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -935,8 +935,8 @@ static int can_do_hugetlb_shm(void) return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group); } -struct file *hugetlb_file_setup(const char *name, size_t size, - vm_flags_t acctflag, +struct file *hugetlb_file_setup(const char *name, unsigned long addr, + size_t size, vm_flags_t acctflag, struct user_struct **user, int creat_flags) { int error = -ENOMEM; @@ -945,6 +945,8 @@ struct file *hugetlb_file_setup(const char *name, size_t size, struct path path; struct dentry *root; struct qstr quick_string; + struct hstate *hstate; + unsigned long num_pages; *user = NULL; if (!hugetlbfs_vfsmount) @@ -978,10 +980,12 @@ struct file *hugetlb_file_setup(const char *name, size_t size, if (!inode) goto out_dentry; + hstate = hstate_inode(inode); + size += addr & ~huge_page_mask(hstate); + num_pages = ALIGN(size, huge_page_size(hstate)) >> + huge_page_shift(hstate); error = -ENOMEM; - if (hugetlb_reserve_pages(inode, 0, - size >> huge_page_shift(hstate_inode(inode)), NULL, - acctflag)) + if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag)) goto out_inode; d_instantiate(path.dentry, inode); -- cgit v1.2.3-55-g7522