Some functions which are called with the mmap_sem held by the caller
may want to release it. Since mmap_sem will become a range lock a
range_rwlock parameter must be added to allow the lock to freed
correctly.
This patch add the additional parameter in the caller and the callee
and also in the vm_fault structure.
Despite this additional parameter which is not used, there is no
functional change in the patch.
Signed-off-by: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/copro_fault.c | 2 +-
arch/powerpc/mm/fault.c | 2 +-
arch/x86/mm/fault.c | 2 +-
arch/x86/mm/mpx.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +-
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 3 +-
drivers/gpu/drm/i915/i915_gem_userptr.c | 2 +-
drivers/gpu/drm/radeon/radeon_ttm.c | 2 +-
drivers/infiniband/core/umem.c | 2 +-
drivers/infiniband/core/umem_odp.c | 2 +-
drivers/infiniband/hw/mthca/mthca_memfree.c | 3 +-
drivers/infiniband/hw/qib/qib_user_pages.c | 2 +-
drivers/infiniband/hw/usnic/usnic_uiom.c | 2 +-
drivers/iommu/intel-svm.c | 2 +-
drivers/media/v4l2-core/videobuf-dma-sg.c | 2 +-
drivers/misc/mic/scif/scif_rma.c | 2 +-
fs/exec.c | 2 +-
fs/userfaultfd.c | 3 +-
include/linux/hugetlb.h | 4 +--
include/linux/mm.h | 21 ++++++++-----
include/linux/pagemap.h | 8 +++--
include/linux/userfaultfd_k.h | 6 ++--
kernel/events/uprobes.c | 4 +--
kernel/futex.c | 2 +-
mm/filemap.c | 5 ++--
mm/frame_vector.c | 2 +-
mm/gup.c | 46 ++++++++++++++++-------------
mm/hugetlb.c | 3 +-
mm/internal.h | 3 +-
mm/khugepaged.c | 17 +++++++----
mm/ksm.c | 3 +-
mm/madvise.c | 14 +++++----
mm/memory.c | 12 ++++----
mm/mempolicy.c | 2 +-
mm/mmap.c | 4 +--
mm/mprotect.c | 2 +-
mm/process_vm_access.c | 3 +-
mm/userfaultfd.c | 8 +++--
security/tomoyo/domain.c | 2 +-
virt/kvm/kvm_main.c | 12 ++++----
40 files changed, 130 insertions(+), 92 deletions(-)
diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
index 697b70ad1195..81fbf79d2e97 100644
--- a/arch/powerpc/mm/copro_fault.c
+++ b/arch/powerpc/mm/copro_fault.c
@@ -77,7 +77,7 @@ int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
}
ret = 0;
- *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0);
+ *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0, NULL);
if (unlikely(*flt & VM_FAULT_ERROR)) {
if (*flt & VM_FAULT_OOM) {
ret = -ENOMEM;
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index fd6484fc2fa9..20f470486177 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -446,7 +446,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
- fault = handle_mm_fault(vma, address, flags);
+ fault = handle_mm_fault(vma, address, flags, NULL);
/*
* Handle the retry right now, the mmap_sem has been released in that
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 428e31763cb9..d81cd399544a 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1394,7 +1394,7 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code,
* the fault. Since we never set FAULT_FLAG_RETRY_NOWAIT, if
* we get VM_FAULT_RETRY back, the mmap_sem has been unlocked.
*/
- fault = handle_mm_fault(vma, address, flags);
+ fault = handle_mm_fault(vma, address, flags, NULL);
major |= fault & VM_FAULT_MAJOR;
/*
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index cd44ae727df7..864a47193b6c 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -547,7 +547,7 @@ static int mpx_resolve_fault(long __user *addr, int write)
int nr_pages = 1;
gup_ret = get_user_pages((unsigned long)addr, nr_pages,
- write ? FOLL_WRITE : 0, NULL, NULL);
+ write ? FOLL_WRITE : 0, NULL, NULL, NULL);
/*
* get_user_pages() returns number of pages gotten.
* 0 means we failed to fault in and get anything,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 4c6094eefc51..14e02d3a6984 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -627,7 +627,7 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
list_add(&guptask.list, >t->guptasks);
spin_unlock(>t->guptasklock);
- r = get_user_pages(userptr, num_pages, flags, p, NULL);
+ r = get_user_pages(userptr, num_pages, flags, p, NULL, NULL);
spin_lock(>t->guptasklock);
list_del(&guptask.list);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index fd56f92f3469..75ca18aaa34e 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -761,7 +761,8 @@ static struct page **etnaviv_gem_userptr_do_get_pages(
down_read(&mm->mmap_sem);
while (pinned < npages) {
ret = get_user_pages_remote(task, mm, ptr, npages - pinned,
- flags, pvec + pinned, NULL, NULL);
+ flags, pvec + pinned, NULL, NULL,
+ NULL);
if (ret < 0)
break;
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 22b46398831e..1f8e8eecb6df 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -516,7 +516,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
obj->userptr.ptr + pinned * PAGE_SIZE,
npages - pinned,
flags,
- pvec + pinned, NULL, NULL);
+ pvec + pinned, NULL, NULL, NULL);
if (ret < 0)
break;
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index aaa3e80fecb4..86ced4d0092c 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -569,7 +569,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)
struct page **pages = ttm->pages + pinned;
r = get_user_pages(userptr, num_pages, write ? FOLL_WRITE : 0,
- pages, NULL);
+ pages, NULL, NULL);
if (r < 0)
goto release_pages;
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 27f155d2df8d..0fe3bfb6839d 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -194,7 +194,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
ret = get_user_pages(cur_base,
min_t(unsigned long, npages,
PAGE_SIZE / sizeof (struct page *)),
- gup_flags, page_list, vma_list);
+ gup_flags, page_list, vma_list, NULL);
if (ret < 0)
goto out;
diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c
index cb2742b548bb..0ac3c739a986 100644
--- a/drivers/infiniband/core/umem_odp.c
+++ b/drivers/infiniband/core/umem_odp.c
@@ -649,7 +649,7 @@ int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 user_virt, u64 bcnt,
*/
npages = get_user_pages_remote(owning_process, owning_mm,
user_virt, gup_num_pages,
- flags, local_page_list, NULL, NULL);
+ flags, local_page_list, NULL, NULL, NULL);
up_read(&owning_mm->mmap_sem);
if (npages < 0)
diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c
index c6fe89d79248..9024f956669a 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -472,7 +472,8 @@ int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
goto out;
}
- ret = get_user_pages(uaddr & PAGE_MASK, 1, FOLL_WRITE, pages, NULL);
+ ret = get_user_pages(uaddr & PAGE_MASK, 1, FOLL_WRITE, pages, NULL,
+ NULL);
if (ret < 0)
goto out;
diff --git a/drivers/infiniband/hw/qib/qib_user_pages.c b/drivers/infiniband/hw/qib/qib_user_pages.c
index ce83ba9a12ef..c1cf13f2722a 100644
--- a/drivers/infiniband/hw/qib/qib_user_pages.c
+++ b/drivers/infiniband/hw/qib/qib_user_pages.c
@@ -70,7 +70,7 @@ static int __qib_get_user_pages(unsigned long start_page, size_t num_pages,
ret = get_user_pages(start_page + got * PAGE_SIZE,
num_pages - got,
FOLL_WRITE | FOLL_FORCE,
- p + got, NULL);
+ p + got, NULL, NULL);
if (ret < 0)
goto bail_release;
}
diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c
index c49db7c33979..1591d0e78bfa 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom.c
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
@@ -146,7 +146,7 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
ret = get_user_pages(cur_base,
min_t(unsigned long, npages,
PAGE_SIZE / sizeof(struct page *)),
- gup_flags, page_list, NULL);
+ gup_flags, page_list, NULL, NULL);
if (ret < 0)
goto out;
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 23c427602c55..4ba770b9cfbb 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -591,7 +591,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)
goto invalid;
ret = handle_mm_fault(vma, address,
- req->wr_req ? FAULT_FLAG_WRITE : 0);
+ req->wr_req ? FAULT_FLAG_WRITE : 0, NULL);
if (ret & VM_FAULT_ERROR)
goto invalid;
diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c
index 0b5c43f7e020..b789070047df 100644
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -186,7 +186,7 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
data, size, dma->nr_pages);
err = get_user_pages(data & PAGE_MASK, dma->nr_pages,
- flags, dma->pages, NULL);
+ flags, dma->pages, NULL, NULL);
if (err != dma->nr_pages) {
dma->nr_pages = (err >= 0) ? err : 0;
diff --git a/drivers/misc/mic/scif/scif_rma.c b/drivers/misc/mic/scif/scif_rma.c
index 329727e00e97..30e3c524216d 100644
--- a/drivers/misc/mic/scif/scif_rma.c
+++ b/drivers/misc/mic/scif/scif_rma.c
@@ -1401,7 +1401,7 @@ int __scif_pin_pages(void *addr, size_t len, int *out_prot,
nr_pages,
(prot & SCIF_PROT_WRITE) ? FOLL_WRITE : 0,
pinned_pages->pages,
- NULL);
+ NULL, NULL);
up_write(&mm->mmap_sem);
if (nr_pages != pinned_pages->nr_pages) {
if (try_upgrade) {
diff --git a/fs/exec.c b/fs/exec.c
index 65145a3df065..49a3a19816f0 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -214,7 +214,7 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
* doing the exec and bprm->mm is the new process's mm.
*/
ret = get_user_pages_remote(current, bprm->mm, pos, 1, gup_flags,
- &page, NULL, NULL);
+ &page, NULL, NULL, NULL);
if (ret <= 0)
return NULL;
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index f7555fc25877..b83117741b11 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -698,7 +698,8 @@ void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *vm_ctx,
}
bool userfaultfd_remove(struct vm_area_struct *vma,
- unsigned long start, unsigned long end)
+ unsigned long start, unsigned long end,
+ struct range_rwlock *range)
{
struct mm_struct *mm = vma->vm_mm;
struct userfaultfd_ctx *ctx;
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index b857fc8cc2ec..c586f0d40995 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -66,7 +66,7 @@ int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_ar
long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
struct page **, struct vm_area_struct **,
unsigned long *, unsigned long *, long, unsigned int,
- int *);
+ int *, struct range_rwlock *);
void unmap_hugepage_range(struct vm_area_struct *,
unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
@@ -137,7 +137,7 @@ static inline unsigned long hugetlb_total_pages(void)
return 0;
}
-#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
+#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n,r) ({ BUG(); 0; })
#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
static inline void hugetlb_report_meminfo(struct seq_file *m)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 00a8fa7e366a..dbd77258baae 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -23,6 +23,7 @@
#include <linux/page_ext.h>
#include <linux/err.h>
#include <linux/page_ref.h>
+#include <linux/range_rwlock.h>
struct mempolicy;
struct anon_vma;
@@ -344,6 +345,7 @@ struct vm_fault {
* page table to avoid allocation from
* atomic context.
*/
+ struct range_rwlock *lockrange; /* RW range lock interval */
};
/* page entry size for vm->huge_fault() */
@@ -1272,13 +1274,14 @@ int invalidate_inode_page(struct page *page);
#ifdef CONFIG_MMU
extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
- unsigned int flags);
+ unsigned int flags, struct range_rwlock *range);
extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
unsigned long address, unsigned int fault_flags,
- bool *unlocked);
+ bool *unlocked, struct range_rwlock *range);
#else
static inline int handle_mm_fault(struct vm_area_struct *vma,
- unsigned long address, unsigned int flags)
+ unsigned long address, unsigned int flags,
+ struct range_rwlock *range)
{
/* should never happen if there's no MMU */
BUG();
@@ -1286,7 +1289,8 @@ static inline int handle_mm_fault(struct vm_area_struct *vma,
}
static inline int fixup_user_fault(struct task_struct *tsk,
struct mm_struct *mm, unsigned long address,
- unsigned int fault_flags, bool *unlocked)
+ unsigned int fault_flags, bool *unlocked,
+ struct range_rwlock *range)
{
/* should never happen if there's no MMU */
BUG();
@@ -1304,12 +1308,15 @@ extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
- struct vm_area_struct **vmas, int *locked);
+ struct vm_area_struct **vmas, int *locked,
+ struct range_rwlock *range);
long get_user_pages(unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
- struct vm_area_struct **vmas);
+ struct vm_area_struct **vmas,
+ struct range_rwlock *range);
long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
- unsigned int gup_flags, struct page **pages, int *locked);
+ unsigned int gup_flags, struct page **pages, int *locked,
+ struct range_rwlock *range);
long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
struct page **pages, unsigned int gup_flags);
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 84943e8057ef..a4c0d2d36d37 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -434,7 +434,7 @@ static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
extern void __lock_page(struct page *page);
extern int __lock_page_killable(struct page *page);
extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
- unsigned int flags);
+ unsigned int flags, struct range_rwlock *range);
extern void unlock_page(struct page *page);
static inline int trylock_page(struct page *page)
@@ -474,10 +474,12 @@ static inline int lock_page_killable(struct page *page)
* __lock_page_or_retry().
*/
static inline int lock_page_or_retry(struct page *page, struct mm_struct *mm,
- unsigned int flags)
+ unsigned int flags,
+ struct range_rwlock *range)
{
might_sleep();
- return trylock_page(page) || __lock_page_or_retry(page, mm, flags);
+ return trylock_page(page) || __lock_page_or_retry(page, mm, flags,
+ range);
}
/*
diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
index 48a3483dccb1..9c73362cf4f6 100644
--- a/include/linux/userfaultfd_k.h
+++ b/include/linux/userfaultfd_k.h
@@ -63,7 +63,8 @@ extern void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *,
extern bool userfaultfd_remove(struct vm_area_struct *vma,
unsigned long start,
- unsigned long end);
+ unsigned long end,
+ struct range_rwlock *range);
extern int userfaultfd_unmap_prep(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
@@ -119,7 +120,8 @@ static inline void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *ctx,
static inline bool userfaultfd_remove(struct vm_area_struct *vma,
unsigned long start,
- unsigned long end)
+ unsigned long end,
+ struct range_rwlock *range)
{
return true;
}
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 0e137f98a50c..dc2e5f7a8bb8 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -309,7 +309,7 @@ int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr,
retry:
/* Read the page with vaddr into memory */
ret = get_user_pages_remote(NULL, mm, vaddr, 1,
- FOLL_FORCE | FOLL_SPLIT, &old_page, &vma, NULL);
+ FOLL_FORCE | FOLL_SPLIT, &old_page, &vma, NULL, NULL);
if (ret <= 0)
return ret;
@@ -1720,7 +1720,7 @@ static int is_trap_at_addr(struct mm_struct *mm, unsigned long vaddr)
* essentially a kernel access to the memory.
*/
result = get_user_pages_remote(NULL, mm, vaddr, 1, FOLL_FORCE, &page,
- NULL, NULL);
+ NULL, NULL, NULL);
if (result < 0)
return result;
diff --git a/kernel/futex.c b/kernel/futex.c
index 45858ec73941..4dd1bba09831 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -727,7 +727,7 @@ static int fault_in_user_writeable(u32 __user *uaddr)
down_read(&mm->mmap_sem);
ret = fixup_user_fault(current, mm, (unsigned long)uaddr,
- FAULT_FLAG_WRITE, NULL);
+ FAULT_FLAG_WRITE, NULL, NULL);
up_read(&mm->mmap_sem);
return ret < 0 ? ret : 0;
diff --git a/mm/filemap.c b/mm/filemap.c
index 1694623a6289..3a5945f2fd3c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1053,7 +1053,7 @@ EXPORT_SYMBOL_GPL(__lock_page_killable);
* with the page locked and the mmap_sem unperturbed.
*/
int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
- unsigned int flags)
+ unsigned int flags, struct range_rwlock *range)
{
if (flags & FAULT_FLAG_ALLOW_RETRY) {
/*
@@ -2232,7 +2232,8 @@ int filemap_fault(struct vm_fault *vmf)
goto no_cached_page;
}
- if (!lock_page_or_retry(page, vmf->vma->vm_mm, vmf->flags)) {
+ if (!lock_page_or_retry(page, vmf->vma->vm_mm, vmf->flags,
+ vmf->lockrange)) {
put_page(page);
return ret | VM_FAULT_RETRY;
}
diff --git a/mm/frame_vector.c b/mm/frame_vector.c
index db77dcb38afd..579d1cbe039c 100644
--- a/mm/frame_vector.c
+++ b/mm/frame_vector.c
@@ -56,7 +56,7 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
vec->got_ref = true;
vec->is_pfns = false;
ret = get_user_pages_locked(start, nr_frames,
- gup_flags, (struct page **)(vec->ptrs), &locked);
+ gup_flags, (struct page **)(vec->ptrs), &locked, NULL);
goto out;
}
diff --git a/mm/gup.c b/mm/gup.c
index 04aa405350dc..b83b47804c6e 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -379,7 +379,8 @@ static int get_gate_page(struct mm_struct *mm, unsigned long address,
* If it is, *@nonblocking will be set to 0 and -EBUSY returned.
*/
static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma,
- unsigned long address, unsigned int *flags, int *nonblocking)
+ unsigned long address, unsigned int *flags, int *nonblocking,
+ struct range_rwlock *range)
{
unsigned int fault_flags = 0;
int ret;
@@ -405,7 +406,7 @@ static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma,
fault_flags |= FAULT_FLAG_TRIED;
}
- ret = handle_mm_fault(vma, address, fault_flags);
+ ret = handle_mm_fault(vma, address, fault_flags, range);
if (ret & VM_FAULT_ERROR) {
if (ret & VM_FAULT_OOM)
return -ENOMEM;
@@ -546,7 +547,8 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags)
static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
- struct vm_area_struct **vmas, int *nonblocking)
+ struct vm_area_struct **vmas, int *nonblocking,
+ struct range_rwlock *range)
{
long i = 0;
unsigned int page_mask;
@@ -589,7 +591,7 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (is_vm_hugetlb_page(vma)) {
i = follow_hugetlb_page(mm, vma, pages, vmas,
&start, &nr_pages, i,
- gup_flags, nonblocking);
+ gup_flags, nonblocking, range);
continue;
}
}
@@ -605,7 +607,7 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (!page) {
int ret;
ret = faultin_page(tsk, vma, start, &foll_flags,
- nonblocking);
+ nonblocking, range);
switch (ret) {
case 0:
goto retry;
@@ -704,7 +706,7 @@ static bool vma_permits_fault(struct vm_area_struct *vma,
*/
int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
unsigned long address, unsigned int fault_flags,
- bool *unlocked)
+ bool *unlocked, struct range_rwlock *range)
{
struct vm_area_struct *vma;
int ret, major = 0;
@@ -720,7 +722,7 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
if (!vma_permits_fault(vma, fault_flags))
return -EFAULT;
- ret = handle_mm_fault(vma, address, fault_flags);
+ ret = handle_mm_fault(vma, address, fault_flags, range);
major |= ret & VM_FAULT_MAJOR;
if (ret & VM_FAULT_ERROR) {
if (ret & VM_FAULT_OOM)
@@ -759,6 +761,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
struct page **pages,
struct vm_area_struct **vmas,
int *locked, bool notify_drop,
+ struct range_rwlock *range,
unsigned int flags)
{
long ret, pages_done;
@@ -778,7 +781,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
lock_dropped = false;
for (;;) {
ret = __get_user_pages(tsk, mm, start, nr_pages, flags, pages,
- vmas, locked);
+ vmas, locked, range);
if (!locked)
/* VM_FAULT_RETRY couldn't trigger, bypass */
return ret;
@@ -818,7 +821,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
lock_dropped = true;
down_read(&mm->mmap_sem);
ret = __get_user_pages(tsk, mm, start, 1, flags | FOLL_TRIED,
- pages, NULL, NULL);
+ pages, NULL, NULL, range);
if (ret != 1) {
BUG_ON(ret > 1);
if (!pages_done)
@@ -866,10 +869,10 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
*/
long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
- int *locked)
+ int *locked, struct range_rwlock *range)
{
return __get_user_pages_locked(current, current->mm, start, nr_pages,
- pages, NULL, locked, true,
+ pages, NULL, locked, true, range,
gup_flags | FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages_locked);
@@ -892,7 +895,7 @@ static __always_inline long __get_user_pages_unlocked(struct task_struct *tsk,
down_read(&mm->mmap_sem);
ret = __get_user_pages_locked(tsk, mm, start, nr_pages, pages, NULL,
- &locked, false, gup_flags);
+ &locked, false, NULL, gup_flags);
if (locked)
up_read(&mm->mmap_sem);
return ret;
@@ -980,10 +983,11 @@ EXPORT_SYMBOL(get_user_pages_unlocked);
long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
- struct vm_area_struct **vmas, int *locked)
+ struct vm_area_struct **vmas, int *locked,
+ struct range_rwlock *range)
{
return __get_user_pages_locked(tsk, mm, start, nr_pages, pages, vmas,
- locked, true,
+ locked, true, range,
gup_flags | FOLL_TOUCH | FOLL_REMOTE);
}
EXPORT_SYMBOL(get_user_pages_remote);
@@ -997,10 +1001,10 @@ EXPORT_SYMBOL(get_user_pages_remote);
*/
long get_user_pages(unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
- struct vm_area_struct **vmas)
+ struct vm_area_struct **vmas, struct range_rwlock *range)
{
return __get_user_pages_locked(current, current->mm, start, nr_pages,
- pages, vmas, NULL, false,
+ pages, vmas, NULL, false, range,
gup_flags | FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages);
@@ -1025,7 +1029,8 @@ EXPORT_SYMBOL(get_user_pages);
* released. If it's released, *@nonblocking will be set to 0.
*/
long populate_vma_page_range(struct vm_area_struct *vma,
- unsigned long start, unsigned long end, int *nonblocking)
+ unsigned long start, unsigned long end, int *nonblocking,
+ struct range_rwlock *range)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long nr_pages = (end - start) / PAGE_SIZE;
@@ -1060,7 +1065,7 @@ long populate_vma_page_range(struct vm_area_struct *vma,
* not result in a stack expansion that recurses back here.
*/
return __get_user_pages(current, mm, start, nr_pages, gup_flags,
- NULL, NULL, nonblocking);
+ NULL, NULL, nonblocking, range);
}
/*
@@ -1109,7 +1114,8 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
* double checks the vma flags, so that it won't mlock pages
* if the vma was already munlocked.
*/
- ret = populate_vma_page_range(vma, nstart, nend, &locked);
+ ret = populate_vma_page_range(vma, nstart, nend, &locked,
+ NULL);
if (ret < 0) {
if (ignore_errors) {
ret = 0;
@@ -1147,7 +1153,7 @@ struct page *get_dump_page(unsigned long addr)
if (__get_user_pages(current, current->mm, addr, 1,
FOLL_FORCE | FOLL_DUMP | FOLL_GET, &page, &vma,
- NULL) < 1)
+ NULL, NULL) < 1)
return NULL;
flush_cache_page(vma, addr, page_to_pfn(page));
return page;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e5828875f7bb..f63e50975017 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4089,7 +4089,8 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page **pages, struct vm_area_struct **vmas,
unsigned long *position, unsigned long *nr_pages,
- long i, unsigned int flags, int *nonblocking)
+ long i, unsigned int flags, int *nonblocking,
+ struct range_rwlock *range)
{
unsigned long pfn_offset;
unsigned long vaddr = *position;
diff --git a/mm/internal.h b/mm/internal.h
index 266efaeaa370..dddb86c1a43b 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -278,7 +278,8 @@ void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
#ifdef CONFIG_MMU
extern long populate_vma_page_range(struct vm_area_struct *vma,
- unsigned long start, unsigned long end, int *nonblocking);
+ unsigned long start, unsigned long end, int *nonblocking,
+ struct range_rwlock *range);
extern void munlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index ba40b7f673f4..d2b2a06f7853 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -875,7 +875,8 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
static bool __collapse_huge_page_swapin(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long address, pmd_t *pmd,
- int referenced)
+ int referenced,
+ struct range_rwlock *range)
{
int swapped_in = 0, ret = 0;
struct vm_fault vmf = {
@@ -884,6 +885,7 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
.flags = FAULT_FLAG_ALLOW_RETRY,
.pmd = pmd,
.pgoff = linear_page_index(vma, address),
+ .lockrange = range,
};
/* we only decide to swapin, if there is enough young ptes */
@@ -928,7 +930,8 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
static void collapse_huge_page(struct mm_struct *mm,
unsigned long address,
struct page **hpage,
- int node, int referenced)
+ int node, int referenced,
+ struct range_rwlock *range)
{
pmd_t *pmd, _pmd;
pte_t *pte;
@@ -986,7 +989,8 @@ static void collapse_huge_page(struct mm_struct *mm,
* If it fails, we release mmap_sem and jump out_nolock.
* Continuing to collapse causes inconsistency.
*/
- if (!__collapse_huge_page_swapin(mm, vma, address, pmd, referenced)) {
+ if (!__collapse_huge_page_swapin(mm, vma, address, pmd, referenced,
+ range)) {
mem_cgroup_cancel_charge(new_page, memcg, true);
up_read(&mm->mmap_sem);
goto out_nolock;
@@ -1093,7 +1097,8 @@ static void collapse_huge_page(struct mm_struct *mm,
static int khugepaged_scan_pmd(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long address,
- struct page **hpage)
+ struct page **hpage,
+ struct range_rwlock *range)
{
pmd_t *pmd;
pte_t *pte, *_pte;
@@ -1207,7 +1212,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
if (ret) {
node = khugepaged_find_target_node();
/* collapse_huge_page will return with the mmap_sem released */
- collapse_huge_page(mm, address, hpage, node, referenced);
+ collapse_huge_page(mm, address, hpage, node, referenced, range);
}
out:
trace_mm_khugepaged_scan_pmd(mm, page, writable, referenced,
@@ -1728,7 +1733,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
} else {
ret = khugepaged_scan_pmd(mm, vma,
khugepaged_scan.address,
- hpage);
+ hpage, NULL);
}
/* move to next address */
khugepaged_scan.address += HPAGE_PMD_SIZE;
diff --git a/mm/ksm.c b/mm/ksm.c
index 19b4f2dea7a5..c419f53912ba 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -391,7 +391,8 @@ static int break_ksm(struct vm_area_struct *vma, unsigned long addr)
break;
if (PageKsm(page))
ret = handle_mm_fault(vma, addr,
- FAULT_FLAG_WRITE | FAULT_FLAG_REMOTE);
+ FAULT_FLAG_WRITE | FAULT_FLAG_REMOTE,
+ NULL);
else
ret = VM_FAULT_WRITE;
put_page(page);
diff --git a/mm/madvise.c b/mm/madvise.c
index 7a2abf0127ae..7eb62e3995ca 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -507,13 +507,14 @@ static long madvise_free(struct vm_area_struct *vma,
*/
static long madvise_dontneed(struct vm_area_struct *vma,
struct vm_area_struct **prev,
- unsigned long start, unsigned long end)
+ unsigned long start, unsigned long end,
+ struct range_rwlock *range)
{
*prev = vma;
if (!can_madv_dontneed_vma(vma))
return -EINVAL;
- if (!userfaultfd_remove(vma, start, end)) {
+ if (!userfaultfd_remove(vma, start, end, range)) {
*prev = NULL; /* mmap_sem has been dropped, prev is stale */
down_read(¤t->mm->mmap_sem);
@@ -590,7 +591,7 @@ static long madvise_remove(struct vm_area_struct *vma,
* mmap_sem.
*/
get_file(f);
- if (userfaultfd_remove(vma, start, end)) {
+ if (userfaultfd_remove(vma, start, end, NULL) {
/* mmap_sem was not released by userfaultfd_remove() */
up_read(¤t->mm->mmap_sem);
}
@@ -643,7 +644,8 @@ static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
static long
madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
- unsigned long start, unsigned long end, int behavior)
+ unsigned long start, unsigned long end, int behavior,
+ struct range_rwlock *range)
{
switch (behavior) {
case MADV_REMOVE:
@@ -659,7 +661,7 @@ madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
return madvise_free(vma, prev, start, end);
/* passthrough */
case MADV_DONTNEED:
- return madvise_dontneed(vma, prev, start, end);
+ return madvise_dontneed(vma, prev, start, end, range);
default:
return madvise_behavior(vma, prev, start, end, behavior);
}
@@ -822,7 +824,7 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
tmp = end;
/* Here vma->vm_start <= start < tmp <= (end|vma->vm_end). */
- error = madvise_vma(vma, &prev, start, tmp, behavior);
+ error = madvise_vma(vma, &prev, start, tmp, behavior, NULL);
if (error)
goto out;
start = tmp;
diff --git a/mm/memory.c b/mm/memory.c
index 235ba51b2fbf..745acb75b3b4 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2732,7 +2732,8 @@ int do_swap_page(struct vm_fault *vmf)
}
swapcache = page;
- locked = lock_page_or_retry(page, vma->vm_mm, vmf->flags);
+ locked = lock_page_or_retry(page, vma->vm_mm, vmf->flags,
+ vmf->lockrange);
delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
if (!locked) {
@@ -3765,7 +3766,7 @@ static int handle_pte_fault(struct vm_fault *vmf)
* return value. See filemap_fault() and __lock_page_or_retry().
*/
static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
- unsigned int flags)
+ unsigned int flags, struct range_rwlock *range)
{
struct vm_fault vmf = {
.vma = vma,
@@ -3773,6 +3774,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
.flags = flags,
.pgoff = linear_page_index(vma, address),
.gfp_mask = __get_fault_gfp_mask(vma),
+ .lockrange = range,
};
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgd;
@@ -3848,7 +3850,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
* return value. See filemap_fault() and __lock_page_or_retry().
*/
int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
- unsigned int flags)
+ unsigned int flags, struct range_rwlock *range)
{
int ret;
@@ -3875,7 +3877,7 @@ int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
if (unlikely(is_vm_hugetlb_page(vma)))
ret = hugetlb_fault(vma->vm_mm, vma, address, flags);
else
- ret = __handle_mm_fault(vma, address, flags);
+ ret = __handle_mm_fault(vma, address, flags, range);
if (flags & FAULT_FLAG_USER) {
mem_cgroup_oom_disable();
@@ -4169,7 +4171,7 @@ int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
struct page *page = NULL;
ret = get_user_pages_remote(tsk, mm, addr, 1,
- gup_flags, &page, &vma, NULL);
+ gup_flags, &page, &vma, NULL, NULL);
if (ret <= 0) {
#ifndef CONFIG_HAVE_IOREMAP_PROT
break;
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 37d0b334bfe9..0658c7240e54 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -855,7 +855,7 @@ static int lookup_node(unsigned long addr)
struct page *p;
int err;
- err = get_user_pages(addr & PAGE_MASK, 1, 0, &p, NULL);
+ err = get_user_pages(addr & PAGE_MASK, 1, 0, &p, NULL, NULL);
if (err >= 0) {
err = page_to_nid(p);
put_page(p);
diff --git a/mm/mmap.c b/mm/mmap.c
index bfbe8856d134..cd8fa7e74784 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2380,7 +2380,7 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
if (!prev || expand_stack(prev, addr))
return NULL;
if (prev->vm_flags & VM_LOCKED)
- populate_vma_page_range(prev, addr, prev->vm_end, NULL);
+ populate_vma_page_range(prev, addr, prev->vm_end, NULL, NULL);
return prev;
}
#else
@@ -2415,7 +2415,7 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
if (expand_stack(vma, addr))
return NULL;
if (vma->vm_flags & VM_LOCKED)
- populate_vma_page_range(vma, addr, start, NULL);
+ populate_vma_page_range(vma, addr, start, NULL, NULL);
return vma;
}
#endif
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 8edd0d576254..fef798619b06 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -358,7 +358,7 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
*/
if ((oldflags & (VM_WRITE | VM_SHARED | VM_LOCKED)) == VM_LOCKED &&
(newflags & VM_WRITE)) {
- populate_vma_page_range(vma, start, end, NULL);
+ populate_vma_page_range(vma, start, end, NULL, NULL);
}
vm_stat_account(mm, oldflags, -nrpages);
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index 8973cd231ece..fb4f2b96d488 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -111,7 +111,8 @@ static int process_vm_rw_single_vec(unsigned long addr,
*/
down_read(&mm->mmap_sem);
pages = get_user_pages_remote(task, mm, pa, pages, flags,
- process_pages, NULL, &locked);
+ process_pages, NULL, &locked,
+ NULL);
if (locked)
up_read(&mm->mmap_sem);
if (pages <= 0)
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 8bcb501bce60..923a1ef22bc2 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -156,7 +156,8 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
unsigned long dst_start,
unsigned long src_start,
unsigned long len,
- bool zeropage)
+ bool zeropage,
+ struct range_rwlock *range)
{
int vm_alloc_shared = dst_vma->vm_flags & VM_SHARED;
int vm_shared = dst_vma->vm_flags & VM_SHARED;
@@ -368,7 +369,8 @@ extern ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
unsigned long dst_start,
unsigned long src_start,
unsigned long len,
- bool zeropage);
+ bool zeropage,
+ struct range_rwlock *range);
#endif /* CONFIG_HUGETLB_PAGE */
static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm,
@@ -439,7 +441,7 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm,
*/
if (is_vm_hugetlb_page(dst_vma))
return __mcopy_atomic_hugetlb(dst_mm, dst_vma, dst_start,
- src_start, len, zeropage);
+ src_start, len, zeropage, NULL);
if (!vma_is_anonymous(dst_vma) && !vma_is_shmem(dst_vma))
goto out_unlock;
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 00d223e9fb37..d2ef438ee887 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -883,7 +883,7 @@ bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
* the execve().
*/
if (get_user_pages_remote(current, bprm->mm, pos, 1,
- FOLL_FORCE, &page, NULL, NULL) <= 0)
+ FOLL_FORCE, &page, NULL, NULL, NULL) <= 0)
return false;
#else
page = bprm->page[pos / PAGE_SIZE];
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 88257b311cb5..43b8a01ac131 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1354,14 +1354,14 @@ static int get_user_page_nowait(unsigned long start, int write,
if (write)
flags |= FOLL_WRITE;
- return get_user_pages(start, 1, flags, page, NULL);
+ return get_user_pages(start, 1, flags, page, NULL, NULL);
}
static inline int check_user_page_hwpoison(unsigned long addr)
{
int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
- rc = get_user_pages(addr, 1, flags, NULL, NULL);
+ rc = get_user_pages(addr, 1, flags, NULL, NULL, NULL);
return rc == -EHWPOISON;
}
@@ -1458,7 +1458,8 @@ static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
static int hva_to_pfn_remapped(struct vm_area_struct *vma,
unsigned long addr, bool *async,
- bool write_fault, kvm_pfn_t *p_pfn)
+ bool write_fault, kvm_pfn_t *p_pfn,
+ struct range_rwlock *range)
{
unsigned long pfn;
int r;
@@ -1472,7 +1473,7 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
bool unlocked = false;
r = fixup_user_fault(current, current->mm, addr,
(write_fault ? FAULT_FLAG_WRITE : 0),
- &unlocked);
+ &unlocked, range);
if (unlocked)
return -EAGAIN;
if (r)
@@ -1549,7 +1550,8 @@ static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
if (vma == NULL)
pfn = KVM_PFN_ERR_FAULT;
else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
- r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn);
+ r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn,
+ NULL);
if (r == -EAGAIN)
goto retry;
if (r < 0)
--
2.7.4
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