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mm: extend 'usage' parameter so that cluster_swap_free_nr() can be reused

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Extend a usage parameter so that cluster_swap_free_nr() can be reused by
both swapcache_clear() and swap_free().  __swap_entry_free() is quite
similar but more tricky as it requires the return value of
__swap_entry_free_locked() which cluster_swap_free_nr() doesn't support.

Link: https://lkml.kernel.org/r/20240724020056.65838-1-21cnbao@gmail.com
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Acked-by: Chris Li <chrisl@kernel.org>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Chuanhua Han <hanchuanhua@oppo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Barry Song 2024-07-24 14:00:56 +12:00 committed by Andrew Morton
parent 4fd568faf6
commit d2539ed7ee
1 changed files with 5 additions and 10 deletions
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15
mm/swapfile.c
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@ -1344,7 +1344,8 @@ static void swap_entry_free(struct swap_info_struct *p, swp_entry_t entry)
}
static void cluster_swap_free_nr(struct swap_info_struct *sis,
unsigned long offset, int nr_pages)
unsigned long offset, int nr_pages,
unsigned char usage)
{
struct swap_cluster_info *ci;
DECLARE_BITMAP(to_free, BITS_PER_LONG) = { 0 };
@ -1354,7 +1355,7 @@ static void cluster_swap_free_nr(struct swap_info_struct *sis,
while (nr_pages) {
nr = min(BITS_PER_LONG, nr_pages);
for (i = 0; i < nr; i++) {
if (!__swap_entry_free_locked(sis, offset + i, 1))
if (!__swap_entry_free_locked(sis, offset + i, usage))
bitmap_set(to_free, i, 1);
}
if (!bitmap_empty(to_free, BITS_PER_LONG)) {
@ -1388,7 +1389,7 @@ void swap_free_nr(swp_entry_t entry, int nr_pages)
while (nr_pages) {
nr = min_t(int, nr_pages, SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER);
cluster_swap_free_nr(sis, offset, nr);
cluster_swap_free_nr(sis, offset, nr, 1);
offset += nr;
nr_pages -= nr;
}
@ -3472,15 +3473,9 @@ int swapcache_prepare(swp_entry_t entry)
void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry)
{
struct swap_cluster_info *ci;
unsigned long offset = swp_offset(entry);
unsigned char usage;
ci = lock_cluster_or_swap_info(si, offset);
usage = __swap_entry_free_locked(si, offset, SWAP_HAS_CACHE);
unlock_cluster_or_swap_info(si, ci);
if (!usage)
free_swap_slot(entry);
cluster_swap_free_nr(si, offset, 1, SWAP_HAS_CACHE);
}
struct swap_info_struct *swp_swap_info(swp_entry_t entry)