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mm: join struct fault_env and vm_fault

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Currently we have two different structures for passing fault information
around - struct vm_fault and struct fault_env.  DAX will need more
information in struct vm_fault to handle its faults so the content of
that structure would become event closer to fault_env.  Furthermore it
would need to generate struct fault_env to be able to call some of the
generic functions.  So at this point I don't think there's much use in
keeping these two structures separate.  Just embed into struct vm_fault
all that is needed to use it for both purposes.

Link: http://lkml.kernel.org/r/1479460644-25076-2-git-send-email-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2016-12-14 15:06:58 -08:00 committed by Linus Torvalds
parent 8b7457ef9a
commit 82b0f8c39a
11 changed files with 423 additions and 422 deletions
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2
Documentation/filesystems/Locking
View file

@ -556,7 +556,7 @@ till "end_pgoff". ->map_pages() is called with page table locked and must
not block. If it's not possible to reach a page without blocking,
filesystem should skip it. Filesystem should use do_set_pte() to setup
page table entry. Pointer to entry associated with the page is passed in
"pte" field in fault_env structure. Pointers to entries for other offsets
"pte" field in vm_fault structure. Pointers to entries for other offsets
should be calculated relative to "pte".
->page_mkwrite() is called when a previously read-only pte is

22
fs/userfaultfd.c
View file

@ -257,9 +257,9 @@ static inline bool userfaultfd_must_wait(struct userfaultfd_ctx *ctx,
* fatal_signal_pending()s, and the mmap_sem must be released before
* returning it.
*/
int handle_userfault(struct fault_env *fe, unsigned long reason)
int handle_userfault(struct vm_fault *vmf, unsigned long reason)
{
struct mm_struct *mm = fe->vma->vm_mm;
struct mm_struct *mm = vmf->vma->vm_mm;
struct userfaultfd_ctx *ctx;
struct userfaultfd_wait_queue uwq;
int ret;
@ -268,7 +268,7 @@ int handle_userfault(struct fault_env *fe, unsigned long reason)
BUG_ON(!rwsem_is_locked(&mm->mmap_sem));
ret = VM_FAULT_SIGBUS;
ctx = fe->vma->vm_userfaultfd_ctx.ctx;
ctx = vmf->vma->vm_userfaultfd_ctx.ctx;
if (!ctx)
goto out;
@ -301,17 +301,18 @@ int handle_userfault(struct fault_env *fe, unsigned long reason)
* without first stopping userland access to the memory. For
* VM_UFFD_MISSING userfaults this is enough for now.
*/
if (unlikely(!(fe->flags & FAULT_FLAG_ALLOW_RETRY))) {
if (unlikely(!(vmf->flags & FAULT_FLAG_ALLOW_RETRY))) {
/*
* Validate the invariant that nowait must allow retry
* to be sure not to return SIGBUS erroneously on
* nowait invocations.
*/
BUG_ON(fe->flags & FAULT_FLAG_RETRY_NOWAIT);
BUG_ON(vmf->flags & FAULT_FLAG_RETRY_NOWAIT);
#ifdef CONFIG_DEBUG_VM
if (printk_ratelimit()) {
printk(KERN_WARNING
"FAULT_FLAG_ALLOW_RETRY missing %x\n", fe->flags);
"FAULT_FLAG_ALLOW_RETRY missing %x\n",
vmf->flags);
dump_stack();
}
#endif
@ -323,7 +324,7 @@ int handle_userfault(struct fault_env *fe, unsigned long reason)
* and wait.
*/
ret = VM_FAULT_RETRY;
if (fe->flags & FAULT_FLAG_RETRY_NOWAIT)
if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
goto out;
/* take the reference before dropping the mmap_sem */
@ -331,11 +332,11 @@ int handle_userfault(struct fault_env *fe, unsigned long reason)
init_waitqueue_func_entry(&uwq.wq, userfaultfd_wake_function);
uwq.wq.private = current;
uwq.msg = userfault_msg(fe->address, fe->flags, reason);
uwq.msg = userfault_msg(vmf->address, vmf->flags, reason);
uwq.ctx = ctx;
return_to_userland =
(fe->flags & (FAULT_FLAG_USER|FAULT_FLAG_KILLABLE)) ==
(vmf->flags & (FAULT_FLAG_USER|FAULT_FLAG_KILLABLE)) ==
(FAULT_FLAG_USER|FAULT_FLAG_KILLABLE);
spin_lock(&ctx->fault_pending_wqh.lock);
@ -353,7 +354,8 @@ int handle_userfault(struct fault_env *fe, unsigned long reason)
TASK_KILLABLE);
spin_unlock(&ctx->fault_pending_wqh.lock);
must_wait = userfaultfd_must_wait(ctx, fe->address, fe->flags, reason);
must_wait = userfaultfd_must_wait(ctx, vmf->address, vmf->flags,
reason);
up_read(&mm->mmap_sem);
if (likely(must_wait && !ACCESS_ONCE(ctx->released) &&

10
include/linux/huge_mm.h
View file

@ -1,12 +1,12 @@
#ifndef _LINUX_HUGE_MM_H
#define _LINUX_HUGE_MM_H
extern int do_huge_pmd_anonymous_page(struct fault_env *fe);
extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf);
extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
struct vm_area_struct *vma);
extern void huge_pmd_set_accessed(struct fault_env *fe, pmd_t orig_pmd);
extern int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd);
extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
unsigned long addr,
pmd_t *pmd,
@ -142,7 +142,7 @@ static inline int hpage_nr_pages(struct page *page)
return 1;
}
extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
extern struct page *huge_zero_page;
@ -212,7 +212,7 @@ static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
return NULL;
}
static inline int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd)
static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
{
return 0;
}

28
include/linux/mm.h
View file

@ -292,10 +292,16 @@ extern pgprot_t protection_map[16];
* pgoff should be used in favour of virtual_address, if possible.
*/
struct vm_fault {
struct vm_area_struct *vma; /* Target VMA */
unsigned int flags; /* FAULT_FLAG_xxx flags */
gfp_t gfp_mask; /* gfp mask to be used for allocations */
pgoff_t pgoff; /* Logical page offset based on vma */
void __user *virtual_address; /* Faulting virtual address */
unsigned long address; /* Faulting virtual address */
void __user *virtual_address; /* Faulting virtual address masked by
* PAGE_MASK */
pmd_t *pmd; /* Pointer to pmd entry matching
* the 'address'
*/
struct page *cow_page; /* Handler may choose to COW */
struct page *page; /* ->fault handlers should return a
@ -309,19 +315,7 @@ struct vm_fault {
* VM_FAULT_DAX_LOCKED and fill in
* entry here.
*/
};
/*
* Page fault context: passes though page fault handler instead of endless list
* of function arguments.
*/
struct fault_env {
struct vm_area_struct *vma; /* Target VMA */
unsigned long address; /* Faulting virtual address */
unsigned int flags; /* FAULT_FLAG_xxx flags */
pmd_t *pmd; /* Pointer to pmd entry matching
* the 'address'
*/
/* These three entries are valid only while holding ptl lock */
pte_t *pte; /* Pointer to pte entry matching
* the 'address'. NULL if the page
* table hasn't been allocated.
@ -351,7 +345,7 @@ struct vm_operations_struct {
int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
pmd_t *, unsigned int flags);
void (*map_pages)(struct fault_env *fe,
void (*map_pages)(struct vm_fault *vmf,
pgoff_t start_pgoff, pgoff_t end_pgoff);
/* notification that a previously read-only page is about to become
@ -625,7 +619,7 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
return pte;
}
int alloc_set_pte(struct fault_env *fe, struct mem_cgroup *memcg,
int alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg,
struct page *page);
#endif
@ -2094,7 +2088,7 @@ extern void truncate_inode_pages_final(struct address_space *);
/* generic vm_area_ops exported for stackable file systems */
extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
extern void filemap_map_pages(struct fault_env *fe,
extern void filemap_map_pages(struct vm_fault *vmf,
pgoff_t start_pgoff, pgoff_t end_pgoff);
extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);

4
include/linux/userfaultfd_k.h
View file

@ -27,7 +27,7 @@
#define UFFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
#define UFFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS)
extern int handle_userfault(struct fault_env *fe, unsigned long reason);
extern int handle_userfault(struct vm_fault *vmf, unsigned long reason);
extern ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start,
unsigned long src_start, unsigned long len);
@ -55,7 +55,7 @@ static inline bool userfaultfd_armed(struct vm_area_struct *vma)
#else /* CONFIG_USERFAULTFD */
/* mm helpers */
static inline int handle_userfault(struct fault_env *fe, unsigned long reason)
static inline int handle_userfault(struct vm_fault *vmf, unsigned long reason)
{
return VM_FAULT_SIGBUS;
}

14
mm/filemap.c
View file

@ -2164,12 +2164,12 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
}
EXPORT_SYMBOL(filemap_fault);
void filemap_map_pages(struct fault_env *fe,
void filemap_map_pages(struct vm_fault *vmf,
pgoff_t start_pgoff, pgoff_t end_pgoff)
{
struct radix_tree_iter iter;
void **slot;
struct file *file = fe->vma->vm_file;
struct file *file = vmf->vma->vm_file;
struct address_space *mapping = file->f_mapping;
pgoff_t last_pgoff = start_pgoff;
loff_t size;
@ -2225,11 +2225,11 @@ void filemap_map_pages(struct fault_env *fe,
if (file->f_ra.mmap_miss > 0)
file->f_ra.mmap_miss--;
fe->address += (iter.index - last_pgoff) << PAGE_SHIFT;
if (fe->pte)
fe->pte += iter.index - last_pgoff;
vmf->address += (iter.index - last_pgoff) << PAGE_SHIFT;
if (vmf->pte)
vmf->pte += iter.index - last_pgoff;
last_pgoff = iter.index;
if (alloc_set_pte(fe, NULL, page))
if (alloc_set_pte(vmf, NULL, page))
goto unlock;
unlock_page(page);
goto next;
@ -2239,7 +2239,7 @@ void filemap_map_pages(struct fault_env *fe,
put_page(page);
next:
/* Huge page is mapped? No need to proceed. */
if (pmd_trans_huge(*fe->pmd))
if (pmd_trans_huge(*vmf->pmd))
break;
if (iter.index == end_pgoff)
break;

173
mm/huge_memory.c
View file

@ -542,13 +542,13 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
}
EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
static int __do_huge_pmd_anonymous_page(struct fault_env *fe, struct page *page,
static int __do_huge_pmd_anonymous_page(struct vm_fault *vmf, struct page *page,
gfp_t gfp)
{
struct vm_area_struct *vma = fe->vma;
struct vm_area_struct *vma = vmf->vma;
struct mem_cgroup *memcg;
pgtable_t pgtable;
unsigned long haddr = fe->address & HPAGE_PMD_MASK;
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
VM_BUG_ON_PAGE(!PageCompound(page), page);
@ -573,9 +573,9 @@ static int __do_huge_pmd_anonymous_page(struct fault_env *fe, struct page *page,
*/
__SetPageUptodate(page);
fe->ptl = pmd_lock(vma->vm_mm, fe->pmd);
if (unlikely(!pmd_none(*fe->pmd))) {
spin_unlock(fe->ptl);
vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
if (unlikely(!pmd_none(*vmf->pmd))) {
spin_unlock(vmf->ptl);
mem_cgroup_cancel_charge(page, memcg, true);
put_page(page);
pte_free(vma->vm_mm, pgtable);
@ -586,11 +586,11 @@ static int __do_huge_pmd_anonymous_page(struct fault_env *fe, struct page *page,
if (userfaultfd_missing(vma)) {
int ret;
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
mem_cgroup_cancel_charge(page, memcg, true);
put_page(page);
pte_free(vma->vm_mm, pgtable);
ret = handle_userfault(fe, VM_UFFD_MISSING);
ret = handle_userfault(vmf, VM_UFFD_MISSING);
VM_BUG_ON(ret & VM_FAULT_FALLBACK);
return ret;
}
@ -600,11 +600,11 @@ static int __do_huge_pmd_anonymous_page(struct fault_env *fe, struct page *page,
page_add_new_anon_rmap(page, vma, haddr, true);
mem_cgroup_commit_charge(page, memcg, false, true);
lru_cache_add_active_or_unevictable(page, vma);
pgtable_trans_huge_deposit(vma->vm_mm, fe->pmd, pgtable);
set_pmd_at(vma->vm_mm, haddr, fe->pmd, entry);
pgtable_trans_huge_deposit(vma->vm_mm, vmf->pmd, pgtable);
set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
atomic_long_inc(&vma->vm_mm->nr_ptes);
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
count_vm_event(THP_FAULT_ALLOC);
}
@ -651,12 +651,12 @@ static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
return true;
}
int do_huge_pmd_anonymous_page(struct fault_env *fe)
int do_huge_pmd_anonymous_page(struct vm_fault *vmf)
{
struct vm_area_struct *vma = fe->vma;
struct vm_area_struct *vma = vmf->vma;
gfp_t gfp;
struct page *page;
unsigned long haddr = fe->address & HPAGE_PMD_MASK;
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
return VM_FAULT_FALLBACK;
@ -664,7 +664,7 @@ int do_huge_pmd_anonymous_page(struct fault_env *fe)
return VM_FAULT_OOM;
if (unlikely(khugepaged_enter(vma, vma->vm_flags)))
return VM_FAULT_OOM;
if (!(fe->flags & FAULT_FLAG_WRITE) &&
if (!(vmf->flags & FAULT_FLAG_WRITE) &&
!mm_forbids_zeropage(vma->vm_mm) &&
transparent_hugepage_use_zero_page()) {
pgtable_t pgtable;
@ -680,22 +680,22 @@ int do_huge_pmd_anonymous_page(struct fault_env *fe)
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
}
fe->ptl = pmd_lock(vma->vm_mm, fe->pmd);
vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
ret = 0;
set = false;
if (pmd_none(*fe->pmd)) {
if (pmd_none(*vmf->pmd)) {
if (userfaultfd_missing(vma)) {
spin_unlock(fe->ptl);
ret = handle_userfault(fe, VM_UFFD_MISSING);
spin_unlock(vmf->ptl);
ret = handle_userfault(vmf, VM_UFFD_MISSING);
VM_BUG_ON(ret & VM_FAULT_FALLBACK);
} else {
set_huge_zero_page(pgtable, vma->vm_mm, vma,
haddr, fe->pmd, zero_page);
spin_unlock(fe->ptl);
haddr, vmf->pmd, zero_page);
spin_unlock(vmf->ptl);
set = true;
}
} else
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
if (!set)
pte_free(vma->vm_mm, pgtable);
return ret;
@ -707,7 +707,7 @@ int do_huge_pmd_anonymous_page(struct fault_env *fe)
return VM_FAULT_FALLBACK;
}
prep_transhuge_page(page);
return __do_huge_pmd_anonymous_page(fe, page, gfp);
return __do_huge_pmd_anonymous_page(vmf, page, gfp);
}
static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
@ -879,30 +879,30 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
return ret;
}
void huge_pmd_set_accessed(struct fault_env *fe, pmd_t orig_pmd)
void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd)
{
pmd_t entry;
unsigned long haddr;
fe->ptl = pmd_lock(fe->vma->vm_mm, fe->pmd);
if (unlikely(!pmd_same(*fe->pmd, orig_pmd)))
vmf->ptl = pmd_lock(vmf->vma->vm_mm, vmf->pmd);
if (unlikely(!pmd_same(*vmf->pmd, orig_pmd)))
goto unlock;
entry = pmd_mkyoung(orig_pmd);
haddr = fe->address & HPAGE_PMD_MASK;
if (pmdp_set_access_flags(fe->vma, haddr, fe->pmd, entry,
fe->flags & FAULT_FLAG_WRITE))
update_mmu_cache_pmd(fe->vma, fe->address, fe->pmd);
haddr = vmf->address & HPAGE_PMD_MASK;
if (pmdp_set_access_flags(vmf->vma, haddr, vmf->pmd, entry,
vmf->flags & FAULT_FLAG_WRITE))
update_mmu_cache_pmd(vmf->vma, vmf->address, vmf->pmd);
unlock:
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
}
static int do_huge_pmd_wp_page_fallback(struct fault_env *fe, pmd_t orig_pmd,
static int do_huge_pmd_wp_page_fallback(struct vm_fault *vmf, pmd_t orig_pmd,
struct page *page)
{
struct vm_area_struct *vma = fe->vma;
unsigned long haddr = fe->address & HPAGE_PMD_MASK;
struct vm_area_struct *vma = vmf->vma;
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
struct mem_cgroup *memcg;
pgtable_t pgtable;
pmd_t _pmd;
@ -921,7 +921,7 @@ static int do_huge_pmd_wp_page_fallback(struct fault_env *fe, pmd_t orig_pmd,
for (i = 0; i < HPAGE_PMD_NR; i++) {
pages[i] = alloc_page_vma_node(GFP_HIGHUSER_MOVABLE |
__GFP_OTHER_NODE, vma,
fe->address, page_to_nid(page));
vmf->address, page_to_nid(page));
if (unlikely(!pages[i] ||
mem_cgroup_try_charge(pages[i], vma->vm_mm,
GFP_KERNEL, &memcg, false))) {
@ -952,15 +952,15 @@ static int do_huge_pmd_wp_page_fallback(struct fault_env *fe, pmd_t orig_pmd,
mmun_end = haddr + HPAGE_PMD_SIZE;
mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
fe->ptl = pmd_lock(vma->vm_mm, fe->pmd);
if (unlikely(!pmd_same(*fe->pmd, orig_pmd)))
vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
if (unlikely(!pmd_same(*vmf->pmd, orig_pmd)))
goto out_free_pages;
VM_BUG_ON_PAGE(!PageHead(page), page);
pmdp_huge_clear_flush_notify(vma, haddr, fe->pmd);
pmdp_huge_clear_flush_notify(vma, haddr, vmf->pmd);
/* leave pmd empty until pte is filled */
pgtable = pgtable_trans_huge_withdraw(vma->vm_mm, fe->pmd);
pgtable = pgtable_trans_huge_withdraw(vma->vm_mm, vmf->pmd);
pmd_populate(vma->vm_mm, &_pmd, pgtable);
for (i = 0; i < HPAGE_PMD_NR; i++, haddr += PAGE_SIZE) {
@ -969,20 +969,20 @@ static int do_huge_pmd_wp_page_fallback(struct fault_env *fe, pmd_t orig_pmd,
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
memcg = (void *)page_private(pages[i]);
set_page_private(pages[i], 0);
page_add_new_anon_rmap(pages[i], fe->vma, haddr, false);
page_add_new_anon_rmap(pages[i], vmf->vma, haddr, false);
mem_cgroup_commit_charge(pages[i], memcg, false, false);
lru_cache_add_active_or_unevictable(pages[i], vma);
fe->pte = pte_offset_map(&_pmd, haddr);
VM_BUG_ON(!pte_none(*fe->pte));
set_pte_at(vma->vm_mm, haddr, fe->pte, entry);
pte_unmap(fe->pte);
vmf->pte = pte_offset_map(&_pmd, haddr);
VM_BUG_ON(!pte_none(*vmf->pte));
set_pte_at(vma->vm_mm, haddr, vmf->pte, entry);
pte_unmap(vmf->pte);
}
kfree(pages);
smp_wmb(); /* make pte visible before pmd */
pmd_populate(vma->vm_mm, fe->pmd, pgtable);
pmd_populate(vma->vm_mm, vmf->pmd, pgtable);
page_remove_rmap(page, true);
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
@ -993,7 +993,7 @@ static int do_huge_pmd_wp_page_fallback(struct fault_env *fe, pmd_t orig_pmd,
return ret;
out_free_pages:
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
for (i = 0; i < HPAGE_PMD_NR; i++) {
memcg = (void *)page_private(pages[i]);
@ -1005,23 +1005,23 @@ static int do_huge_pmd_wp_page_fallback(struct fault_env *fe, pmd_t orig_pmd,
goto out;
}
int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd)
int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd)
{
struct vm_area_struct *vma = fe->vma;
struct vm_area_struct *vma = vmf->vma;
struct page *page = NULL, *new_page;
struct mem_cgroup *memcg;
unsigned long haddr = fe->address & HPAGE_PMD_MASK;
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
unsigned long mmun_start; /* For mmu_notifiers */
unsigned long mmun_end; /* For mmu_notifiers */
gfp_t huge_gfp; /* for allocation and charge */
int ret = 0;
fe->ptl = pmd_lockptr(vma->vm_mm, fe->pmd);
vmf->ptl = pmd_lockptr(vma->vm_mm, vmf->pmd);
VM_BUG_ON_VMA(!vma->anon_vma, vma);
if (is_huge_zero_pmd(orig_pmd))
goto alloc;
spin_lock(fe->ptl);
if (unlikely(!pmd_same(*fe->pmd, orig_pmd)))
spin_lock(vmf->ptl);
if (unlikely(!pmd_same(*vmf->pmd, orig_pmd)))
goto out_unlock;
page = pmd_page(orig_pmd);
@ -1034,13 +1034,13 @@ int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd)
pmd_t entry;
entry = pmd_mkyoung(orig_pmd);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
if (pmdp_set_access_flags(vma, haddr, fe->pmd, entry, 1))
update_mmu_cache_pmd(vma, fe->address, fe->pmd);
if (pmdp_set_access_flags(vma, haddr, vmf->pmd, entry, 1))
update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
ret |= VM_FAULT_WRITE;
goto out_unlock;
}
get_page(page);
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
alloc:
if (transparent_hugepage_enabled(vma) &&
!transparent_hugepage_debug_cow()) {
@ -1053,12 +1053,12 @@ int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd)
prep_transhuge_page(new_page);
} else {
if (!page) {
split_huge_pmd(vma, fe->pmd, fe->address);
split_huge_pmd(vma, vmf->pmd, vmf->address);
ret |= VM_FAULT_FALLBACK;
} else {
ret = do_huge_pmd_wp_page_fallback(fe, orig_pmd, page);
ret = do_huge_pmd_wp_page_fallback(vmf, orig_pmd, page);
if (ret & VM_FAULT_OOM) {
split_huge_pmd(vma, fe->pmd, fe->address);
split_huge_pmd(vma, vmf->pmd, vmf->address);
ret |= VM_FAULT_FALLBACK;
}
put_page(page);
@ -1070,7 +1070,7 @@ int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd)
if (unlikely(mem_cgroup_try_charge(new_page, vma->vm_mm,
huge_gfp, &memcg, true))) {
put_page(new_page);
split_huge_pmd(vma, fe->pmd, fe->address);
split_huge_pmd(vma, vmf->pmd, vmf->address);
if (page)
put_page(page);
ret |= VM_FAULT_FALLBACK;
@ -1090,11 +1090,11 @@ int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd)
mmun_end = haddr + HPAGE_PMD_SIZE;
mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
spin_lock(fe->ptl);
spin_lock(vmf->ptl);
if (page)
put_page(page);
if (unlikely(!pmd_same(*fe->pmd, orig_pmd))) {
spin_unlock(fe->ptl);
if (unlikely(!pmd_same(*vmf->pmd, orig_pmd))) {
spin_unlock(vmf->ptl);
mem_cgroup_cancel_charge(new_page, memcg, true);
put_page(new_page);
goto out_mn;
@ -1102,12 +1102,12 @@ int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd)
pmd_t entry;
entry = mk_huge_pmd(new_page, vma->vm_page_prot);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
pmdp_huge_clear_flush_notify(vma, haddr, fe->pmd);
pmdp_huge_clear_flush_notify(vma, haddr, vmf->pmd);
page_add_new_anon_rmap(new_page, vma, haddr, true);
mem_cgroup_commit_charge(new_page, memcg, false, true);
lru_cache_add_active_or_unevictable(new_page, vma);
set_pmd_at(vma->vm_mm, haddr, fe->pmd, entry);
update_mmu_cache_pmd(vma, fe->address, fe->pmd);
set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
if (!page) {
add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
} else {
@ -1117,13 +1117,13 @@ int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd)
}
ret |= VM_FAULT_WRITE;
}
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
out_mn:
mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
out:
return ret;
out_unlock:
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
return ret;
}
@ -1196,12 +1196,12 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
}
/* NUMA hinting page fault entry point for trans huge pmds */
int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t pmd)
{
struct vm_area_struct *vma = fe->vma;
struct vm_area_struct *vma = vmf->vma;
struct anon_vma *anon_vma = NULL;
struct page *page;
unsigned long haddr = fe->address & HPAGE_PMD_MASK;
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
int page_nid = -1, this_nid = numa_node_id();
int target_nid, last_cpupid = -1;
bool page_locked;
@ -1209,8 +1209,8 @@ int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
bool was_writable;
int flags = 0;
fe->ptl = pmd_lock(vma->vm_mm, fe->pmd);
if (unlikely(!pmd_same(pmd, *fe->pmd)))
vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
if (unlikely(!pmd_same(pmd, *vmf->pmd)))
goto out_unlock;
/*
@ -1218,9 +1218,9 @@ int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
* without disrupting NUMA hinting information. Do not relock and
* check_same as the page may no longer be mapped.
*/
if (unlikely(pmd_trans_migrating(*fe->pmd))) {
page = pmd_page(*fe->pmd);
spin_unlock(fe->ptl);
if (unlikely(pmd_trans_migrating(*vmf->pmd))) {
page = pmd_page(*vmf->pmd);
spin_unlock(vmf->ptl);
wait_on_page_locked(page);
goto out;
}
@ -1253,7 +1253,7 @@ int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
/* Migration could have started since the pmd_trans_migrating check */
if (!page_locked) {
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
wait_on_page_locked(page);
page_nid = -1;
goto out;
@ -1264,12 +1264,12 @@ int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
* to serialises splits
*/
get_page(page);
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
anon_vma = page_lock_anon_vma_read(page);
/* Confirm the PMD did not change while page_table_lock was released */
spin_lock(fe->ptl);
if (unlikely(!pmd_same(pmd, *fe->pmd))) {
spin_lock(vmf->ptl);
if (unlikely(!pmd_same(pmd, *vmf->pmd))) {
unlock_page(page);
put_page(page);
page_nid = -1;
@ -1287,9 +1287,9 @@ int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
* Migrate the THP to the requested node, returns with page unlocked
* and access rights restored.
*/
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
migrated = migrate_misplaced_transhuge_page(vma->vm_mm, vma,
fe->pmd, pmd, fe->address, page, target_nid);
vmf->pmd, pmd, vmf->address, page, target_nid);
if (migrated) {
flags |= TNF_MIGRATED;
page_nid = target_nid;
@ -1304,18 +1304,19 @@ int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
pmd = pmd_mkyoung(pmd);
if (was_writable)
pmd = pmd_mkwrite(pmd);
set_pmd_at(vma->vm_mm, haddr, fe->pmd, pmd);
update_mmu_cache_pmd(vma, fe->address, fe->pmd);
set_pmd_at(vma->vm_mm, haddr, vmf->pmd, pmd);
update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
unlock_page(page);
out_unlock:
spin_unlock(fe->ptl);
spin_unlock(vmf->ptl);
out:
if (anon_vma)
page_unlock_anon_vma_read(anon_vma);
if (page_nid != -1)
task_numa_fault(last_cpupid, page_nid, HPAGE_PMD_NR, fe->flags);
task_numa_fault(last_cpupid, page_nid, HPAGE_PMD_NR,
vmf->flags);
return 0;
}

2
mm/internal.h
View file

@ -36,7 +36,7 @@
/* Do not use these with a slab allocator */
#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
int do_swap_page(struct fault_env *fe, pte_t orig_pte);
int do_swap_page(struct vm_fault *vmf, pte_t orig_pte);
void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);

20
mm/khugepaged.c
View file

@ -877,7 +877,7 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
{
pte_t pteval;
int swapped_in = 0, ret = 0;
struct fault_env fe = {
struct vm_fault vmf = {
.vma = vma,
.address = address,
.flags = FAULT_FLAG_ALLOW_RETRY,
@ -889,19 +889,19 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
trace_mm_collapse_huge_page_swapin(mm, swapped_in, referenced, 0);
return false;
}
fe.pte = pte_offset_map(pmd, address);
for (; fe.address < address + HPAGE_PMD_NR*PAGE_SIZE;
fe.pte++, fe.address += PAGE_SIZE) {
pteval = *fe.pte;
vmf.pte = pte_offset_map(pmd, address);
for (; vmf.address < address + HPAGE_PMD_NR*PAGE_SIZE;
vmf.pte++, vmf.address += PAGE_SIZE) {
pteval = *vmf.pte;
if (!is_swap_pte(pteval))
continue;
swapped_in++;
ret = do_swap_page(&fe, pteval);
ret = do_swap_page(&vmf, pteval);
/* do_swap_page returns VM_FAULT_RETRY with released mmap_sem */
if (ret & VM_FAULT_RETRY) {
down_read(&mm->mmap_sem);
if (hugepage_vma_revalidate(mm, address, &fe.vma)) {
if (hugepage_vma_revalidate(mm, address, &vmf.vma)) {
/* vma is no longer available, don't continue to swapin */
trace_mm_collapse_huge_page_swapin(mm, swapped_in, referenced, 0);
return false;
@ -915,10 +915,10 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
return false;
}
/* pte is unmapped now, we need to map it */
fe.pte = pte_offset_map(pmd, fe.address);
vmf.pte = pte_offset_map(pmd, vmf.address);
}
fe.pte--;
pte_unmap(fe.pte);
vmf.pte--;
pte_unmap(vmf.pte);
trace_mm_collapse_huge_page_swapin(mm, swapped_in, referenced, 1);
return true;
}

568
mm/memory.c
View file

File diff suppressed because it is too large Load diff

2
mm/nommu.c
View file

@ -1801,7 +1801,7 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
}
EXPORT_SYMBOL(filemap_fault);
void filemap_map_pages(struct fault_env *fe,
void filemap_map_pages(struct vm_fault *vmf,
pgoff_t start_pgoff, pgoff_t end_pgoff)
{
BUG();