diff mbox series

[v5,5/9] mm: shmem: use swap_free_nr() to free shmem swap entries

Message ID 342207fa679fc88a447dac2e101ad79e6050fe79.1723434324.git.baolin.wang@linux.alibaba.com (mailing list archive)
State New
Headers show
Series support large folio swap-out and swap-in for shmem | expand

Commit Message

Baolin Wang Aug. 12, 2024, 7:42 a.m. UTC
As a preparation for supporting shmem large folio swapout, use swap_free_nr()
to free some continuous swap entries of the shmem large folio when the
large folio was swapped in from the swap cache. In addition, the index
should also be round down to the number of pages when adding the swapin
folio into the pagecache.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
 mm/shmem.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/mm/shmem.c b/mm/shmem.c
index d0d54939da48..f6bab42180ea 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1961,6 +1961,7 @@  static void shmem_set_folio_swapin_error(struct inode *inode, pgoff_t index,
 	struct address_space *mapping = inode->i_mapping;
 	swp_entry_t swapin_error;
 	void *old;
+	int nr_pages;
 
 	swapin_error = make_poisoned_swp_entry();
 	old = xa_cmpxchg_irq(&mapping->i_pages, index,
@@ -1969,6 +1970,7 @@  static void shmem_set_folio_swapin_error(struct inode *inode, pgoff_t index,
 	if (old != swp_to_radix_entry(swap))
 		return;
 
+	nr_pages = folio_nr_pages(folio);
 	folio_wait_writeback(folio);
 	delete_from_swap_cache(folio);
 	/*
@@ -1976,8 +1978,8 @@  static void shmem_set_folio_swapin_error(struct inode *inode, pgoff_t index,
 	 * won't be 0 when inode is released and thus trigger WARN_ON(i_blocks)
 	 * in shmem_evict_inode().
 	 */
-	shmem_recalc_inode(inode, -1, -1);
-	swap_free(swap);
+	shmem_recalc_inode(inode, -nr_pages, -nr_pages);
+	swap_free_nr(swap, nr_pages);
 }
 
 /*
@@ -1996,7 +1998,7 @@  static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
 	struct swap_info_struct *si;
 	struct folio *folio = NULL;
 	swp_entry_t swap;
-	int error;
+	int error, nr_pages;
 
 	VM_BUG_ON(!*foliop || !xa_is_value(*foliop));
 	swap = radix_to_swp_entry(*foliop);
@@ -2043,6 +2045,7 @@  static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
 		goto failed;
 	}
 	folio_wait_writeback(folio);
+	nr_pages = folio_nr_pages(folio);
 
 	/*
 	 * Some architectures may have to restore extra metadata to the
@@ -2056,19 +2059,20 @@  static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
 			goto failed;
 	}
 
-	error = shmem_add_to_page_cache(folio, mapping, index,
+	error = shmem_add_to_page_cache(folio, mapping,
+					round_down(index, nr_pages),
 					swp_to_radix_entry(swap), gfp);
 	if (error)
 		goto failed;
 
-	shmem_recalc_inode(inode, 0, -1);
+	shmem_recalc_inode(inode, 0, -nr_pages);
 
 	if (sgp == SGP_WRITE)
 		folio_mark_accessed(folio);
 
 	delete_from_swap_cache(folio);
 	folio_mark_dirty(folio);
-	swap_free(swap);
+	swap_free_nr(swap, nr_pages);
 	put_swap_device(si);
 
 	*foliop = folio;