Commit ba6851b4 authored by Miaohe Lin's avatar Miaohe Lin Committed by akpm

mm: filter out swapin error entry in shmem mapping

There might be swapin error entries in shmem mapping.  Filter them out to
avoid "Bad swap file entry" complaint.

Link: https://lkml.kernel.org/r/20220519125030.21486-6-linmiaohe@huawei.comSigned-off-by: default avatarMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: default avatarNaoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: NeilBrown <neilb@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 6cec2b95
...@@ -248,10 +248,13 @@ static void force_shm_swapin_readahead(struct vm_area_struct *vma, ...@@ -248,10 +248,13 @@ static void force_shm_swapin_readahead(struct vm_area_struct *vma,
if (!xa_is_value(page)) if (!xa_is_value(page))
continue; continue;
swap = radix_to_swp_entry(page);
/* There might be swapin error entries in shmem mapping. */
if (non_swap_entry(swap))
continue;
xas_pause(&xas); xas_pause(&xas);
rcu_read_unlock(); rcu_read_unlock();
swap = radix_to_swp_entry(page);
page = read_swap_cache_async(swap, GFP_HIGHUSER_MOVABLE, page = read_swap_cache_async(swap, GFP_HIGHUSER_MOVABLE,
NULL, 0, false, &splug); NULL, 0, false, &splug);
if (page) if (page)
......
...@@ -410,6 +410,9 @@ struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index) ...@@ -410,6 +410,9 @@ struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index)
return NULL; return NULL;
swp = radix_to_swp_entry(page); swp = radix_to_swp_entry(page);
/* There might be swapin error entries in shmem mapping. */
if (non_swap_entry(swp))
return NULL;
/* Prevent swapoff from happening to us */ /* Prevent swapoff from happening to us */
si = get_swap_device(swp); si = get_swap_device(swp);
if (!si) if (!si)
......
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