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Message-Id: <20210408234327.624367-3-axelrasmussen@google.com>
Date: Thu, 8 Apr 2021 16:43:20 -0700
From: Axel Rasmussen <axelrasmussen@...gle.com>
To: Alexander Viro <viro@...iv.linux.org.uk>,
Andrea Arcangeli <aarcange@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Daniel Colascione <dancol@...gle.com>,
Hugh Dickins <hughd@...gle.com>,
Jerome Glisse <jglisse@...hat.com>,
Joe Perches <joe@...ches.com>,
Lokesh Gidra <lokeshgidra@...gle.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Peter Xu <peterx@...hat.com>, Shaohua Li <shli@...com>,
Shuah Khan <shuah@...nel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Wang Qing <wangqing@...o.com>
Cc: linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-mm@...ck.org, Axel Rasmussen <axelrasmussen@...gle.com>,
Brian Geffon <bgeffon@...gle.com>,
"Dr . David Alan Gilbert" <dgilbert@...hat.com>,
Mina Almasry <almasrymina@...gle.com>,
Oliver Upton <oupton@...gle.com>
Subject: [PATCH 2/9] userfaultfd/shmem: combine shmem_{mcopy_atomic,mfill_zeropage}_pte
Previously, we did a dance where we had one calling path in
userfaultfd.c (mfill_atomic_pte), but then we split it into two in
shmem_fs.h (shmem_{mcopy_atomic,mfill_zeropage}_pte), and then rejoined
into a single shared function in shmem.c (shmem_mfill_atomic_pte).
This is all a bit overly complex. Just call the single combined shmem
function directly, allowing us to clean up various branches,
boilerplate, etc.
While we're touching this function, two other small cleanup changes:
- offset is equivalent to pgoff, so we can get rid of offset entirely.
- Split two VM_BUG_ON cases into two statements. This means the line
number reported when the BUG is hit specifies exactly which condition
was true.
Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
---
include/linux/shmem_fs.h | 15 +++++-------
mm/shmem.c | 52 +++++++++++++---------------------------
mm/userfaultfd.c | 10 +++-----
3 files changed, 25 insertions(+), 52 deletions(-)
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index d82b6f396588..919e36671fe6 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -122,21 +122,18 @@ static inline bool shmem_file(struct file *file)
extern bool shmem_charge(struct inode *inode, long pages);
extern void shmem_uncharge(struct inode *inode, long pages);
+#ifdef CONFIG_USERFAULTFD
#ifdef CONFIG_SHMEM
extern int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
unsigned long src_addr,
+ bool zeropage,
struct page **pagep);
-extern int shmem_mfill_zeropage_pte(struct mm_struct *dst_mm,
- pmd_t *dst_pmd,
- struct vm_area_struct *dst_vma,
- unsigned long dst_addr);
-#else
+#else /* !CONFIG_SHMEM */
#define shmem_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
- src_addr, pagep) ({ BUG(); 0; })
-#define shmem_mfill_zeropage_pte(dst_mm, dst_pmd, dst_vma, \
- dst_addr) ({ BUG(); 0; })
-#endif
+ src_addr, zeropage, pagep) ({ BUG(); 0; })
+#endif /* CONFIG_SHMEM */
+#endif /* CONFIG_USERFAULTFD */
#endif
diff --git a/mm/shmem.c b/mm/shmem.c
index b2db4ed0fbc7..c21f20cc4204 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2354,13 +2354,14 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
return inode;
}
-static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
- pmd_t *dst_pmd,
- struct vm_area_struct *dst_vma,
- unsigned long dst_addr,
- unsigned long src_addr,
- bool zeropage,
- struct page **pagep)
+#ifdef CONFIG_USERFAULTFD
+int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm,
+ pmd_t *dst_pmd,
+ struct vm_area_struct *dst_vma,
+ unsigned long dst_addr,
+ unsigned long src_addr,
+ bool zeropage,
+ struct page **pagep)
{
struct inode *inode = file_inode(dst_vma->vm_file);
struct shmem_inode_info *info = SHMEM_I(inode);
@@ -2372,7 +2373,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
struct page *page;
pte_t _dst_pte, *dst_pte;
int ret;
- pgoff_t offset, max_off;
+ pgoff_t max_off;
ret = -ENOMEM;
if (!shmem_inode_acct_block(inode, 1))
@@ -2383,7 +2384,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
if (!page)
goto out_unacct_blocks;
- if (!zeropage) { /* mcopy_atomic */
+ if (!zeropage) { /* COPY */
page_kaddr = kmap_atomic(page);
ret = copy_from_user(page_kaddr,
(const void __user *)src_addr,
@@ -2397,7 +2398,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
/* don't free the page */
return -ENOENT;
}
- } else { /* mfill_zeropage_atomic */
+ } else { /* ZEROPAGE */
clear_highpage(page);
}
} else {
@@ -2405,15 +2406,15 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
*pagep = NULL;
}
- VM_BUG_ON(PageLocked(page) || PageSwapBacked(page));
+ VM_BUG_ON(PageLocked(page));
+ VM_BUG_ON(PageSwapBacked(page));
__SetPageLocked(page);
__SetPageSwapBacked(page);
__SetPageUptodate(page);
ret = -EFAULT;
- offset = linear_page_index(dst_vma, dst_addr);
max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
- if (unlikely(offset >= max_off))
+ if (unlikely(pgoff >= max_off))
goto out_release;
ret = shmem_add_to_page_cache(page, mapping, pgoff, NULL,
@@ -2439,7 +2440,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
ret = -EFAULT;
max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
- if (unlikely(offset >= max_off))
+ if (unlikely(pgoff >= max_off))
goto out_release_unlock;
ret = -EEXIST;
@@ -2476,28 +2477,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
shmem_inode_unacct_blocks(inode, 1);
goto out;
}
-
-int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm,
- pmd_t *dst_pmd,
- struct vm_area_struct *dst_vma,
- unsigned long dst_addr,
- unsigned long src_addr,
- struct page **pagep)
-{
- return shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma,
- dst_addr, src_addr, false, pagep);
-}
-
-int shmem_mfill_zeropage_pte(struct mm_struct *dst_mm,
- pmd_t *dst_pmd,
- struct vm_area_struct *dst_vma,
- unsigned long dst_addr)
-{
- struct page *page = NULL;
-
- return shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma,
- dst_addr, 0, true, &page);
-}
+#endif /* CONFIG_USERFAULTFD */
#ifdef CONFIG_TMPFS
static const struct inode_operations shmem_symlink_inode_operations;
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index ce6cb4760d2c..60ae22207761 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -440,13 +440,9 @@ static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm,
dst_vma, dst_addr);
} else {
VM_WARN_ON_ONCE(wp_copy);
- if (!zeropage)
- err = shmem_mcopy_atomic_pte(dst_mm, dst_pmd,
- dst_vma, dst_addr,
- src_addr, page);
- else
- err = shmem_mfill_zeropage_pte(dst_mm, dst_pmd,
- dst_vma, dst_addr);
+ err = shmem_mcopy_atomic_pte(dst_mm, dst_pmd, dst_vma,
+ dst_addr, src_addr, zeropage,
+ page);
}
return err;
--
2.31.1.295.g9ea45b61b8-goog
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