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Revert "fork: defer linking file vma until vma is fully initialized"

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This reverts commit 0c42f7e039 which is commit
35e351780fa9d8240dd6f7e4f245f9ea37e96c19 upstream.

The backport is incomplete and causes xfstests failures. The consequences
of the incomplete backport seem worse than the original issue, so pick
the lesser evil and revert until a full backport is ready.

Link: https://lore.kernel.org/stable/20240604004751.3883227-1-leah.rumancik@gmail.com/
Reported-by: Leah Rumancik <leah.rumancik@gmail.com>
Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sam James
2024-06-14 09:40:28 +01:00
committed by Greg Kroah-Hartman
parent 35e395373e
commit 04b0c41912
1 changed files with 9 additions and 9 deletions
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18
kernel/fork.c
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@@ -662,15 +662,6 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
} else if (anon_vma_fork(tmp, mpnt))
goto fail_nomem_anon_vma_fork;
tmp->vm_flags &= ~(VM_LOCKED | VM_LOCKONFAULT);
/*
* Copy/update hugetlb private vma information.
*/
if (is_vm_hugetlb_page(tmp))
hugetlb_dup_vma_private(tmp);
if (tmp->vm_ops && tmp->vm_ops->open)
tmp->vm_ops->open(tmp);
file = tmp->vm_file;
if (file) {
struct address_space *mapping = file->f_mapping;
@@ -687,6 +678,12 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
i_mmap_unlock_write(mapping);
}
/*
* Copy/update hugetlb private vma information.
*/
if (is_vm_hugetlb_page(tmp))
hugetlb_dup_vma_private(tmp);
/* Link the vma into the MT */
mas.index = tmp->vm_start;
mas.last = tmp->vm_end - 1;
@@ -698,6 +695,9 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
if (!(tmp->vm_flags & VM_WIPEONFORK))
retval = copy_page_range(tmp, mpnt);
if (tmp->vm_ops && tmp->vm_ops->open)
tmp->vm_ops->open(tmp);
if (retval)
goto loop_out;
}