The patch titled
Subject: userfaultfd: replace ENOSPC with ESRCH in case mm has gone during copy/zeropage
has been added to the -mm tree. Its filename is
userfaultfd-replace-enospc-with-esrch-in-case-mm-has-gone-during-copy-zeropage.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-replace-enospc-with-esrch-in-case-mm-has-gone-during-copy-zeropage.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-replace-enospc-with-esrch-in-case-mm-has-gone-during-copy-zeropage.patch
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------------------------------------------------------
From: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Subject: userfaultfd: replace ENOSPC with ESRCH in case mm has gone during copy/zeropage
When the process exit races with outstanding mcopy_atomic, it would be
better to return ESRCH error. When such race occurs the process and it's
mm are going away and returning "no such process" to the uffd monitor
seems better fit than ENOSPC.
Link: http://lkml.kernel.org/r/1502111545-32305-1-git-send-email-rppt@xxxxxxxxxxxxxxxxxx
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Suggested-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: "Dr. David Alan Gilbert" <dgilbert@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/userfaultfd.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN fs/userfaultfd.c~userfaultfd-replace-enospc-with-esrch-in-case-mm-has-gone-during-copy-zeropage fs/userfaultfd.c
--- a/fs/userfaultfd.c~userfaultfd-replace-enospc-with-esrch-in-case-mm-has-gone-during-copy-zeropage
+++ a/fs/userfaultfd.c
@@ -1600,7 +1600,7 @@ static int userfaultfd_copy(struct userf
uffdio_copy.len);
mmput(ctx->mm);
} else {
- return -ENOSPC;
+ return -ESRCH;
}
if (unlikely(put_user(ret, &user_uffdio_copy->copy)))
return -EFAULT;
@@ -1647,7 +1647,7 @@ static int userfaultfd_zeropage(struct u
uffdio_zeropage.range.len);
mmput(ctx->mm);
} else {
- return -ENOSPC;
+ return -ESRCH;
}
if (unlikely(put_user(ret, &user_uffdio_zeropage->zeropage)))
return -EFAULT;
_
Patches currently in -mm which might be from rppt@xxxxxxxxxxxxxxxxxx are
userfaultfd-replace-enospc-with-esrch-in-case-mm-has-gone-during-copy-zeropage.patch
shmem-shmem_charge-verify-max_block-is-not-exceeded-before-inode-update.patch
shmem-introduce-shmem_inode_acct_block.patch
userfaultfd-shmem-add-shmem_mfill_zeropage_pte-for-userfaultfd-support.patch
userfaultfd-mcopy_atomic-introduce-mfill_atomic_pte-helper.patch
userfaultfd-shmem-wire-up-shmem_mfill_zeropage_pte.patch
userfaultfd-report-uffdio_zeropage-as-available-for-shmem-vmas.patch
userfaultfd-selftest-enable-testing-of-uffdio_zeropage-for-shmem.patch
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