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mm: swapoff: shmem_find_swap_entries() filter out other types 

Swapfile "type" was passed all the way down to shmem_unuse_inode(), but
then forgotten from shmem_find_swap_entries(): with the result that
removing one swapfile would try to free up all the swap from shmem - no
problem when only one swapfile anyway, but counter-productive when more,
causing swapoff to be unnecessarily OOM-killed when it should succeed.

Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1904081254470.1523@eggly.anvils
Fixes: b56a2d8af9 ("mm: rid swapoff of quadratic complexity")
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Cc: Vineeth Pillai <vpillai@digitalocean.com>
Cc: Kelley Nielsen <kelleynnn@gmail.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2019-04-18 17:49:58 -07:00 committed by Linus Torvalds
parent 1a62b18d51
commit 8703954654
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
mm/shmem.c
View File

@ -1099,10 +1099,11 @@ extern struct swap_info_struct *swap_info[];
static int shmem_find_swap_entries(struct address_space *mapping,
pgoff_t start, unsigned int nr_entries,
struct page **entries, pgoff_t *indices,
bool frontswap)
unsigned int type, bool frontswap)
{
XA_STATE(xas, &mapping->i_pages, start);
struct page *page;
swp_entry_t entry;
unsigned int ret = 0;
if (!nr_entries)
@ -1116,13 +1117,12 @@ static int shmem_find_swap_entries(struct address_space *mapping,
if (!xa_is_value(page))
continue;
if (frontswap) {
swp_entry_t entry = radix_to_swp_entry(page);
if (!frontswap_test(swap_info[swp_type(entry)],
swp_offset(entry)))
continue;
}
entry = radix_to_swp_entry(page);
if (swp_type(entry) != type)
continue;
if (frontswap &&
!frontswap_test(swap_info[type], swp_offset(entry)))
continue;
indices[ret] = xas.xa_index;
entries[ret] = page;
@ -1194,7 +1194,7 @@ static int shmem_unuse_inode(struct inode *inode, unsigned int type,
pvec.nr = shmem_find_swap_entries(mapping, start, nr_entries,
pvec.pages, indices,
frontswap);
type, frontswap);
if (pvec.nr == 0) {
ret = 0;
break;