From patchwork Wed Mar 30 20:11:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sweet Tea Dorminy X-Patchwork-Id: 12796309 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 C3AAEC433EF for ; Wed, 30 Mar 2022 20:11:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231839AbiC3UNS (ORCPT ); Wed, 30 Mar 2022 16:13:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230131AbiC3UNP (ORCPT ); Wed, 30 Mar 2022 16:13:15 -0400 Received: from box.fidei.email (box.fidei.email [IPv6:2605:2700:0:2:a800:ff:feba:dc44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C919F6542E; Wed, 30 Mar 2022 13:11:28 -0700 (PDT) Received: from authenticated-user (box.fidei.email [71.19.144.250]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by box.fidei.email (Postfix) with ESMTPSA id 39BEE804FB; Wed, 30 Mar 2022 16:11:28 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=dorminy.me; s=mail; t=1648671088; bh=wtT7OHHCcx98T8VqFZwDN0GGICwV8kFV3QJpvmbxiBo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ruAflQygb4/+91m0+yMOXk3nzbxBAVdLIlMuOgr9ucwz42Br2NAlzYrfHrFvtfpR7 fNEq6CAP1J2+aeXiAm0oO9TsbVIo2Fl1OpHxBKQi6wJIL+tVfIa8BHxZCTSmfHpJwl rOC/n8sjdrbBrEj+rRcTxxuzeg4HAOgb8ZKg97NDQ2R/2+PQr3vz9SQYM3zruxHSVt D6sMA0YeAUYGzZWepPp2cdFcQ0ynzbpDj3fZbeyFLiNw4q+Dre8Be7zBbt7ctSZp4N KihvHA2ZB4yW8sfYnxQAQVB21i75LYY/OMVvbs2ko5BkyIYVHrTNH+YlqRzlqzb4uE vBeFWqGsVmJGQ== From: Sweet Tea Dorminy To: Chris Mason , Josef Bacik , David Sterba , Nick Terrell , linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org, kernel-team@fb.com Cc: Sweet Tea Dorminy , Nikolay Borisov Subject: [PATCH v3 1/2] btrfs: factor out allocating an array of pages Date: Wed, 30 Mar 2022 16:11:22 -0400 Message-Id: <3feb62bb8e605e708a0f839136a7354ec66b7b6b.1648669832.git.sweettea-kernel@dorminy.me> In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Several functions currently populate an array of page pointers one allocated page at a time; factor out the common code so as to allow improvements to all of the sites at once. Signed-off-by: Sweet Tea Dorminy Reviewed-by: Nikolay Borisov --- Changes in v3: - expanded 'int r' to 'int ret', reflected renaming throughout - made sure there was space after variable declarations - fixed up kerneldoc to be more btrfs's style Changes in v2: - moved the new btrfs_alloc_page_array() function to extent_io.[ch] --- fs/btrfs/check-integrity.c | 8 ++--- fs/btrfs/compression.c | 39 ++++++++++------------- fs/btrfs/extent_io.c | 65 ++++++++++++++++++++++++++++---------- fs/btrfs/extent_io.h | 2 ++ fs/btrfs/inode.c | 10 +++--- fs/btrfs/raid56.c | 30 +++--------------- 6 files changed, 79 insertions(+), 75 deletions(-) diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c index 7e9f90fa0388..366d5a80f3c5 100644 --- a/fs/btrfs/check-integrity.c +++ b/fs/btrfs/check-integrity.c @@ -1553,11 +1553,9 @@ static int btrfsic_read_block(struct btrfsic_state *state, return -ENOMEM; block_ctx->datav = block_ctx->mem_to_free; block_ctx->pagev = (struct page **)(block_ctx->datav + num_pages); - for (i = 0; i < num_pages; i++) { - block_ctx->pagev[i] = alloc_page(GFP_NOFS); - if (!block_ctx->pagev[i]) - return -1; - } + ret = btrfs_alloc_page_array(num_pages, block_ctx->pagev); + if (ret) + return ret; dev_bytenr = block_ctx->dev_bytenr; for (i = 0; i < num_pages;) { diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index be476f094300..3772195222e9 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -801,8 +801,6 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, struct extent_map_tree *em_tree; struct compressed_bio *cb; unsigned int compressed_len; - unsigned int nr_pages; - unsigned int pg_index; struct bio *comp_bio = NULL; const u64 disk_bytenr = bio->bi_iter.bi_sector << SECTOR_SHIFT; u64 cur_disk_byte = disk_bytenr; @@ -812,7 +810,8 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, u64 em_start; struct extent_map *em; blk_status_t ret; - int faili = 0; + int ret2; + int i; u8 *sums; em_tree = &BTRFS_I(inode)->extent_tree; @@ -855,25 +854,20 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, cb->compress_type = extent_compress_type(bio_flags); cb->orig_bio = bio; - nr_pages = DIV_ROUND_UP(compressed_len, PAGE_SIZE); - cb->compressed_pages = kcalloc(nr_pages, sizeof(struct page *), - GFP_NOFS); + cb->nr_pages = DIV_ROUND_UP(compressed_len, PAGE_SIZE); + cb->compressed_pages = kcalloc(cb->nr_pages, sizeof(struct page *), + GFP_NOFS); if (!cb->compressed_pages) { ret = BLK_STS_RESOURCE; - goto fail1; + goto fail; } - for (pg_index = 0; pg_index < nr_pages; pg_index++) { - cb->compressed_pages[pg_index] = alloc_page(GFP_NOFS); - if (!cb->compressed_pages[pg_index]) { - faili = pg_index - 1; - ret = BLK_STS_RESOURCE; - goto fail2; - } + ret2 = btrfs_alloc_page_array(cb->nr_pages, cb->compressed_pages); + if (ret2) { + ret = BLK_STS_RESOURCE; + goto fail; } - faili = nr_pages - 1; - cb->nr_pages = nr_pages; - + add_ra_bio_pages(inode, em_start + em_len, cb); /* include any pages we added in add_ra-bio_pages */ @@ -949,14 +943,15 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, } return BLK_STS_OK; -fail2: - while (faili >= 0) { - __free_page(cb->compressed_pages[faili]); - faili--; +fail: + if (cb->compressed_pages) { + for (i = 0; i < cb->nr_pages; i++) { + if (cb->compressed_pages[i]) + __free_page(cb->compressed_pages[i]); + } } kfree(cb->compressed_pages); -fail1: kfree(cb); out: free_extent_map(em); diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 53b59944013f..ab4c1c4d1b59 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3132,6 +3132,33 @@ static void end_bio_extent_readpage(struct bio *bio) bio_put(bio); } +/** + * Populate every slot in a provided array with pages. + * + * @nr_pages: the number of pages to request + * @page_array: the array to fill with pages; any existing non-null entries in + * the array will be skipped + * + * Return: 0 if all pages were able to be allocated; -ENOMEM otherwise, and the + * caller is responsible for freeing all non-null page pointers in the array. + */ +int btrfs_alloc_page_array(unsigned long nr_pages, struct page **page_array) +{ + int i; + + for (i = 0; i < nr_pages; i++) { + struct page *page; + + if (page_array[i]) + continue; + page = alloc_page(GFP_NOFS); + if (!page) + return -ENOMEM; + page_array[i] = page; + } + return 0; +} + /* * Initialize the members up to but not including 'bio'. Use after allocating a * new bio by bio_alloc_bioset as it does not initialize the bytes outside of @@ -5898,9 +5925,9 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src) { int i; - struct page *p; struct extent_buffer *new; int num_pages = num_extent_pages(src); + int ret; new = __alloc_extent_buffer(src->fs_info, src->start, src->len); if (new == NULL) @@ -5913,22 +5940,23 @@ struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src) */ set_bit(EXTENT_BUFFER_UNMAPPED, &new->bflags); + memset(new->pages, 0, sizeof(*new->pages) * num_pages); + ret = btrfs_alloc_page_array(num_pages, new->pages); + if (ret) { + btrfs_release_extent_buffer(new); + return NULL; + } + for (i = 0; i < num_pages; i++) { int ret; + struct page *p = new->pages[i]; - p = alloc_page(GFP_NOFS); - if (!p) { - btrfs_release_extent_buffer(new); - return NULL; - } ret = attach_extent_buffer_page(new, p, NULL); if (ret < 0) { - put_page(p); btrfs_release_extent_buffer(new); return NULL; } WARN_ON(PageDirty(p)); - new->pages[i] = p; copy_page(page_address(p), page_address(src->pages[i])); } set_extent_buffer_uptodate(new); @@ -5942,31 +5970,36 @@ struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, struct extent_buffer *eb; int num_pages; int i; + int ret; eb = __alloc_extent_buffer(fs_info, start, len); if (!eb) return NULL; num_pages = num_extent_pages(eb); + ret = btrfs_alloc_page_array(num_pages, eb->pages); + if (ret) + goto err; + for (i = 0; i < num_pages; i++) { - int ret; + struct page *p = eb->pages[i]; - eb->pages[i] = alloc_page(GFP_NOFS); - if (!eb->pages[i]) - goto err; - ret = attach_extent_buffer_page(eb, eb->pages[i], NULL); + ret = attach_extent_buffer_page(eb, p, NULL); if (ret < 0) goto err; } + set_extent_buffer_uptodate(eb); btrfs_set_header_nritems(eb, 0); set_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags); return eb; err: - for (; i > 0; i--) { - detach_extent_buffer_page(eb, eb->pages[i - 1]); - __free_page(eb->pages[i - 1]); + for (i = 0; i < num_pages; i++) { + if (eb->pages[i]) { + detach_extent_buffer_page(eb, eb->pages[i]); + __free_page(eb->pages[i]); + } } __free_extent_buffer(eb); return NULL; diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 151e9da5da2d..464269e28941 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -277,6 +277,8 @@ void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end, struct page *locked_page, u32 bits_to_clear, unsigned long page_ops); + +int btrfs_alloc_page_array(unsigned long nr_pages, struct page **page_array); struct bio *btrfs_bio_alloc(unsigned int nr_iovecs); struct bio *btrfs_bio_clone(struct bio *bio); struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index c7b15634fe70..121858652a09 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -10427,13 +10427,11 @@ static ssize_t btrfs_encoded_read_regular(struct kiocb *iocb, pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); if (!pages) return -ENOMEM; - for (i = 0; i < nr_pages; i++) { - pages[i] = alloc_page(GFP_NOFS); - if (!pages[i]) { - ret = -ENOMEM; - goto out; + ret = btrfs_alloc_page_array(nr_pages, pages); + if (ret) { + ret = -ENOMEM; + goto out; } - } ret = btrfs_encoded_read_regular_fill_pages(inode, start, disk_bytenr, disk_io_size, pages); diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c index 0e239a4c3b26..ea7a9152b1cc 100644 --- a/fs/btrfs/raid56.c +++ b/fs/btrfs/raid56.c @@ -1026,37 +1026,15 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info, /* allocate pages for all the stripes in the bio, including parity */ static int alloc_rbio_pages(struct btrfs_raid_bio *rbio) { - int i; - struct page *page; - - for (i = 0; i < rbio->nr_pages; i++) { - if (rbio->stripe_pages[i]) - continue; - page = alloc_page(GFP_NOFS); - if (!page) - return -ENOMEM; - rbio->stripe_pages[i] = page; - } - return 0; + return btrfs_alloc_page_array(rbio->nr_pages, rbio->stripe_pages); } /* only allocate pages for p/q stripes */ static int alloc_rbio_parity_pages(struct btrfs_raid_bio *rbio) { - int i; - struct page *page; - - i = rbio_stripe_page_index(rbio, rbio->nr_data, 0); - - for (; i < rbio->nr_pages; i++) { - if (rbio->stripe_pages[i]) - continue; - page = alloc_page(GFP_NOFS); - if (!page) - return -ENOMEM; - rbio->stripe_pages[i] = page; - } - return 0; + int data_pages = rbio_stripe_page_index(rbio, rbio->nr_data, 0); + return btrfs_alloc_page_array(rbio->nr_pages - data_pages, + rbio->stripe_pages + data_pages); } /*