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authorSteven Truelove <steven.truelove@utoronto.ca>2012-03-21 16:34:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:59 -0700
commit40716e29243de46720e5773797791466c28904ec (patch)
tree19616ad05cbead73d0643b002a7ced8baa292ee2
parent21a3c273f88c9cbbaf7e14505df0131d95c8f262 (diff)
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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 <steven.truelove@utoronto.ca> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/hugetlbfs/inode.c14
-rw-r--r--include/linux/hugetlb.h6
-rw-r--r--ipc/shm.c2
-rw-r--r--mm/mmap.c6
4 files changed, 17 insertions, 11 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 79408159a00..631329f3de6 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);
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index cf0181738c9..000837e126e 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -152,7 +152,8 @@ static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
-struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
+struct file *hugetlb_file_setup(const char *name, unsigned long addr,
+ size_t size, vm_flags_t acct,
struct user_struct **user, int creat_flags);
static inline int is_file_hugepages(struct file *file)
@@ -168,7 +169,8 @@ static inline int is_file_hugepages(struct file *file)
#else /* !CONFIG_HUGETLBFS */
#define is_file_hugepages(file) 0
-static inline struct file *hugetlb_file_setup(const char *name, size_t size,
+static inline 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)
{
return ERR_PTR(-ENOSYS);
diff --git a/ipc/shm.c b/ipc/shm.c
index b76be5bda6c..406c5b20819 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -482,7 +482,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
/* hugetlb_file_setup applies strict accounting */
if (shmflg & SHM_NORESERVE)
acctflag = VM_NORESERVE;
- file = hugetlb_file_setup(name, size, acctflag,
+ file = hugetlb_file_setup(name, 0, size, acctflag,
&shp->mlock_user, HUGETLB_SHMFS_INODE);
} else {
/*
diff --git a/mm/mmap.c b/mm/mmap.c
index 9e0c0de2e7e..a19cc271e79 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1099,9 +1099,9 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
* A dummy user value is used because we are not locking
* memory so no accounting is necessary
*/
- len = ALIGN(len, huge_page_size(&default_hstate));
- file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, VM_NORESERVE,
- &user, HUGETLB_ANONHUGE_INODE);
+ file = hugetlb_file_setup(HUGETLB_ANON_FILE, addr, len,
+ VM_NORESERVE, &user,
+ HUGETLB_ANONHUGE_INODE);
if (IS_ERR(file))
return PTR_ERR(file);
}