From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0764AC433FE for ; Sun, 16 Oct 2022 23:58:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229780AbiJPX6C (ORCPT ); Sun, 16 Oct 2022 19:58:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56168 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229646AbiJPX56 (ORCPT ); Sun, 16 Oct 2022 19:57:58 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D95272CC86 for ; Sun, 16 Oct 2022 16:57:54 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 29CC7B80D0B for ; Sun, 16 Oct 2022 23:57:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DAA9FC433C1; Sun, 16 Oct 2022 23:57:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1665964671; bh=NyqRTybYV7WMLUtekpTkUpbUhyL7UP8sFpN3XO0edNI=; h=Date:To:From:Subject:From; b=RIFT7I+PyXDcUdjBvwiNXs1h6sM+pezwyl7jVmOR0KHIGP+5rWEtigQ0Zp0jYgKm+ U8F/HwunSYOiDmwpiW3/E8I6jtDV7qULGT1qBUPNQZKT98NLqL5iGdI1bFfi0Mz3k5 xgw9GXHV7BuSQy02eYVLojA7GrT+1jhfk3OiQuFs= Date: Sun, 16 Oct 2022 16:57:51 -0700 To: mm-commits@vger.kernel.org, willy@infradead.org, hughd@google.com, vishal.moola@gmail.com, akpm@linux-foundation.org From: Andrew Morton Subject: + filemap-find_get_entries-now-updates-start-offset.patch added to mm-unstable branch Message-Id: <20221016235751.DAA9FC433C1@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: filemap: find_get_entries() now updates start offset has been added to the -mm mm-unstable branch. Its filename is filemap-find_get_entries-now-updates-start-offset.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/filemap-find_get_entries-now-updates-start-offset.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: "Vishal Moola (Oracle)" Subject: filemap: find_get_entries() now updates start offset Date: Thu, 13 Oct 2022 15:57:08 -0700 Initially, find_get_entries() was being passed in the start offset as a value. That left the calculation of the offset to the callers. This led to complexity in the callers trying to keep track of the index. Now find_get_entires() takes in a pointer to the start offset and updates the value to be directly after the last entry found. If no entry is found, the offset is not changed. This gets rid of multiple hacky calculations that kept track of the start offset. Link: https://lkml.kernel.org/r/20221013225708.1879-3-vishal.moola@gmail.com Signed-off-by: Vishal Moola (Oracle) Cc: Hugh Dickins Cc: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton --- mm/filemap.c | 15 ++++++++++++--- mm/internal.h | 2 +- mm/shmem.c | 11 ++++------- mm/truncate.c | 19 +++++++------------ 4 files changed, 24 insertions(+), 23 deletions(-) --- a/mm/filemap.c~filemap-find_get_entries-now-updates-start-offset +++ a/mm/filemap.c @@ -2048,10 +2048,10 @@ reset: * * Return: The number of entries which were found. */ -unsigned find_get_entries(struct address_space *mapping, pgoff_t start, +unsigned find_get_entries(struct address_space *mapping, pgoff_t *start, pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices) { - XA_STATE(xas, &mapping->i_pages, start); + XA_STATE(xas, &mapping->i_pages, *start); struct folio *folio; rcu_read_lock(); @@ -2060,8 +2060,17 @@ unsigned find_get_entries(struct address if (!folio_batch_add(fbatch, folio)) break; } - rcu_read_unlock(); + if (folio_batch_count(fbatch)) { + unsigned long nr = 1; + int idx = folio_batch_count(fbatch) - 1; + + folio = fbatch->folios[idx]; + if (!xa_is_value(folio) && !folio_test_hugetlb(folio)) + nr = folio_nr_pages(folio); + *start = indices[idx] + nr; + } + rcu_read_unlock(); return folio_batch_count(fbatch); } --- a/mm/internal.h~filemap-find_get_entries-now-updates-start-offset +++ a/mm/internal.h @@ -108,7 +108,7 @@ static inline void force_page_cache_read unsigned find_lock_entries(struct address_space *mapping, pgoff_t *start, pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices); -unsigned find_get_entries(struct address_space *mapping, pgoff_t start, +unsigned find_get_entries(struct address_space *mapping, pgoff_t *start, pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices); void filemap_free_folio(struct address_space *mapping, struct folio *folio); int truncate_inode_folio(struct address_space *mapping, struct folio *folio); --- a/mm/shmem.c~filemap-find_get_entries-now-updates-start-offset +++ a/mm/shmem.c @@ -973,7 +973,7 @@ static void shmem_undo_range(struct inod while (index < end) { cond_resched(); - if (!find_get_entries(mapping, index, end - 1, &fbatch, + if (!find_get_entries(mapping, &index, end - 1, &fbatch, indices)) { /* If all gone or hole-punch or unfalloc, we're done */ if (index == start || end != -1) @@ -985,13 +985,12 @@ static void shmem_undo_range(struct inod for (i = 0; i < folio_batch_count(&fbatch); i++) { folio = fbatch.folios[i]; - index = indices[i]; if (xa_is_value(folio)) { if (unfalloc) continue; - if (shmem_free_swap(mapping, index, folio)) { + if (shmem_free_swap(mapping, indices[i], folio)) { /* Swap was replaced by page: retry */ - index--; + index = indices[i]; break; } nr_swaps_freed++; @@ -1004,19 +1003,17 @@ static void shmem_undo_range(struct inod if (folio_mapping(folio) != mapping) { /* Page was replaced by swap: retry */ folio_unlock(folio); - index--; + index = indices[i]; break; } VM_BUG_ON_FOLIO(folio_test_writeback(folio), folio); truncate_inode_folio(mapping, folio); } - index = folio->index + folio_nr_pages(folio) - 1; folio_unlock(folio); } folio_batch_remove_exceptionals(&fbatch); folio_batch_release(&fbatch); - index++; } spin_lock_irq(&info->lock); --- a/mm/truncate.c~filemap-find_get_entries-now-updates-start-offset +++ a/mm/truncate.c @@ -400,7 +400,7 @@ void truncate_inode_pages_range(struct a index = start; while (index < end) { cond_resched(); - if (!find_get_entries(mapping, index, end - 1, &fbatch, + if (!find_get_entries(mapping, &index, end - 1, &fbatch, indices)) { /* If all gone from start onwards, we're done */ if (index == start) @@ -414,21 +414,18 @@ void truncate_inode_pages_range(struct a struct folio *folio = fbatch.folios[i]; /* We rely upon deletion not changing page->index */ - index = indices[i]; if (xa_is_value(folio)) continue; folio_lock(folio); - VM_BUG_ON_FOLIO(!folio_contains(folio, index), folio); + VM_BUG_ON_FOLIO(!folio_contains(folio, indices[i]), folio); folio_wait_writeback(folio); truncate_inode_folio(mapping, folio); folio_unlock(folio); - index = folio_index(folio) + folio_nr_pages(folio) - 1; } truncate_folio_batch_exceptionals(mapping, &fbatch, indices); folio_batch_release(&fbatch); - index++; } } EXPORT_SYMBOL(truncate_inode_pages_range); @@ -636,16 +633,15 @@ int invalidate_inode_pages2_range(struct folio_batch_init(&fbatch); index = start; - while (find_get_entries(mapping, index, end, &fbatch, indices)) { + while (find_get_entries(mapping, &index, end, &fbatch, indices)) { for (i = 0; i < folio_batch_count(&fbatch); i++) { struct folio *folio = fbatch.folios[i]; /* We rely upon deletion not changing folio->index */ - index = indices[i]; if (xa_is_value(folio)) { if (!invalidate_exceptional_entry2(mapping, - index, folio)) + indices[i], folio)) ret = -EBUSY; continue; } @@ -655,13 +651,13 @@ int invalidate_inode_pages2_range(struct * If folio is mapped, before taking its lock, * zap the rest of the file in one hit. */ - unmap_mapping_pages(mapping, index, - (1 + end - index), false); + unmap_mapping_pages(mapping, indices[i], + (1 + end - indices[i]), false); did_range_unmap = 1; } folio_lock(folio); - VM_BUG_ON_FOLIO(!folio_contains(folio, index), folio); + VM_BUG_ON_FOLIO(!folio_contains(folio, indices[i]), folio); if (folio->mapping != mapping) { folio_unlock(folio); continue; @@ -684,7 +680,6 @@ int invalidate_inode_pages2_range(struct folio_batch_remove_exceptionals(&fbatch); folio_batch_release(&fbatch); cond_resched(); - index++; } /* * For DAX we invalidate page tables after invalidating page cache. We _ Patches currently in -mm which might be from vishal.moola@gmail.com are filemap-find_lock_entries-now-updates-start-offset.patch filemap-find_get_entries-now-updates-start-offset.patch