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. Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> --- mm/shmem.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index b3e39d9cf42c..fdc71e14916c 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1962,6 +1962,7 @@ 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, @@ -1970,6 +1971,7 @@ 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); /* @@ -1977,8 +1979,8 @@ 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); } /* @@ -1997,7 +1999,7 @@ 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); @@ -2044,6 +2046,7 @@ 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 @@ -2062,14 +2065,14 @@ static int shmem_swapin_folio(struct inode *inode, pgoff_t index, 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; -- 2.39.3
