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[73.189.111.8]) by smtp.googlemail.com with ESMTPSA id x190-20020a6231c7000000b0052def2e20dasm6858174pfx.167.2022.08.15.11.55.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Aug 2022 11:55:57 -0700 (PDT) From: "Vishal Moola (Oracle)" To: linux-fsdevel@vger.kernel.org Cc: linux-btrfs@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Vishal Moola (Oracle)" Subject: [PATCH 1/7] filemap: Add filemap_get_folios_contig() Date: Mon, 15 Aug 2022 11:54:46 -0700 Message-Id: <20220815185452.37447-2-vishal.moola@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220815185452.37447-1-vishal.moola@gmail.com> References: <20220815185452.37447-1-vishal.moola@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" This function is meant to replace find_get_pages_contig(). Unlike find_get_pages_contig(), filemap_get_folios_contig() no longer takes in a target number of pages to find - It returns up to 15 contiguous folios. To be more consistent with filemap_get_folios(), filemap_get_folios_contig() now also updates the start index passed in, and takes an end index. Signed-off-by: Vishal Moola (Oracle) --- include/linux/pagemap.h | 2 ++ mm/filemap.c | 73 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 0178b2040ea3..8689c32d628b 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -718,6 +718,8 @@ static inline struct page *find_subpage(struct page *he= ad, pgoff_t index) =20 unsigned filemap_get_folios(struct address_space *mapping, pgoff_t *start, pgoff_t end, struct folio_batch *fbatch); +unsigned filemap_get_folios_contig(struct address_space *mapping, + pgoff_t *start, pgoff_t end, struct folio_batch *fbatch); unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t star= t, unsigned int nr_pages, struct page **pages); unsigned find_get_pages_range_tag(struct address_space *mapping, pgoff_t *= index, diff --git a/mm/filemap.c b/mm/filemap.c index 15800334147b..3a497e178fde 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2194,6 +2194,79 @@ bool folio_more_pages(struct folio *folio, pgoff_t i= ndex, pgoff_t max) return index < folio->index + folio_nr_pages(folio) - 1; } =20 +/** + * filemap_get_folios_contig - Get a batch of contiguous folios + * @mapping: The address_space to search + * @start: The starting page index + * @end: The final page index (inclusive) + * @fbatch: The batch to fill + * + * filemap_get_folios_contig() works exactly like filemap_get_folios(), + * except the returned folios are guaranteed to be contiguous. This may + * not return all contiguous folios if the batch gets filled up. + * + * Return: The number of folios found. + * Also update @start to be positioned for traversal of the next folio. + */ + +unsigned filemap_get_folios_contig(struct address_space *mapping, + pgoff_t *start, pgoff_t end, struct folio_batch *fbatch) +{ + XA_STATE(xas, &mapping->i_pages, *start); + unsigned long nr; + struct folio *folio; + + rcu_read_lock(); + + for (folio =3D xas_load(&xas); folio && xas.xa_index <=3D end; + folio =3D xas_next(&xas)) { + if (xas_retry(&xas, folio)) + continue; + /* + * If the entry has been swapped out, we can stop looking. + * No current caller is looking for DAX entries. + */ + if (xa_is_value(folio)) + goto update_start; + + if (!folio_try_get_rcu(folio)) + goto retry; + + if (unlikely(folio !=3D xas_reload(&xas))) + goto put_folio; + + if (!folio_batch_add(fbatch, folio)) { + nr =3D folio_nr_pages(folio); + + if (folio_test_hugetlb(folio)) + nr =3D 1; + *start =3D folio->index + nr; + goto out; + } + continue; +put_folio: + folio_put(folio); + +retry: + xas_reset(&xas); + } + +update_start: + nr =3D folio_batch_count(fbatch); + + if (nr) { + folio =3D fbatch->folios[nr - 1]; + if (folio_test_hugetlb(folio)) + *start =3D folio->index + 1; + else + *start =3D folio->index + folio_nr_pages(folio); + } +out: + rcu_read_unlock(); + return folio_batch_count(fbatch); +} +EXPORT_SYMBOL(filemap_get_folios_contig); + /** * find_get_pages_contig - gang contiguous pagecache lookup * @mapping: The address_space to search --=20 2.36.1