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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Ackerley Tng reported an issue with hugetlbfs fallocate as noted in the Closes tag. The issue showed up after the conversion of hugetlb page cache lookup code to use page_cache_next_miss. User visible effects are: - hugetlbfs fallocate incorrectly returns -EEXIST if pages are presnet in the file. - hugetlb pages will not be included in core dumps if they need to be brought in via GUP. - userfaultfd UFFDIO_COPY will not notice pages already present in the cache. It may try to allocate a new page and potentially return ENOMEM as opposed to EEXIST. Revert the use page_cache_next_miss() in hugetlb code. IMPORTANT NOTE FOR STABLE BACKPORTS: This patch will apply cleanly to v6.3. However, due to the change of filemap_get_folio() return values, it will not function correctly. This patch must be modified for stable backports. Fixes: d0ce0e47b323 ("mm/hugetlb: convert hugetlb fault paths to use alloc_hugetlb_folio()") Reported-by: Ackerley Tng Closes: https://lore.kernel.org/linux-mm/cover.1683069252.git.ackerleytng@google.com Signed-off-by: Mike Kravetz Reviewed-by: Sidhartha Kumar --- fs/hugetlbfs/inode.c | 8 +++----- mm/hugetlb.c | 11 +++++------ 2 files changed, 8 insertions(+), 11 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 90361a922cec..7b17ccfa039d 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -821,7 +821,6 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, */ struct folio *folio; unsigned long addr; - bool present; cond_resched(); @@ -842,10 +841,9 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, mutex_lock(&hugetlb_fault_mutex_table[hash]); /* See if already present in mapping to avoid alloc/free */ - rcu_read_lock(); - present = page_cache_next_miss(mapping, index, 1) != index; - rcu_read_unlock(); - if (present) { + folio = filemap_get_folio(mapping, index); + if (!IS_ERR(folio)) { + folio_put(folio); mutex_unlock(&hugetlb_fault_mutex_table[hash]); continue; } diff --git a/mm/hugetlb.c b/mm/hugetlb.c index d76574425da3..cb9077b96b43 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -5728,13 +5728,12 @@ static bool hugetlbfs_pagecache_present(struct hstate *h, { struct address_space *mapping = vma->vm_file->f_mapping; pgoff_t idx = vma_hugecache_offset(h, vma, address); - bool present; - - rcu_read_lock(); - present = page_cache_next_miss(mapping, idx, 1) != idx; - rcu_read_unlock(); + struct folio *folio; - return present; + folio = filemap_get_folio(mapping, idx); + if (!IS_ERR(folio)) + folio_put(folio); + return folio != NULL; } int hugetlb_add_to_page_cache(struct folio *folio, struct address_space *mapping,