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Mon, 08 Sep 2025 11:52:22 -0700 (PDT) Received: from localhost ([2a03:2880:ff:7::]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3276f57b227sm37661021a91.6.2025.09.08.11.52.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Sep 2025 11:52:22 -0700 (PDT) From: Joanne Koong To: brauner@kernel.org, miklos@szeredi.hu Cc: hch@infradead.org, djwong@kernel.org, hsiangkao@linux.alibaba.com, linux-block@vger.kernel.org, gfs2@lists.linux.dev, linux-fsdevel@vger.kernel.org, kernel-team@meta.com, linux-xfs@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v2 04/16] iomap: store read/readahead bio generically Date: Mon, 8 Sep 2025 11:51:10 -0700 Message-ID: <20250908185122.3199171-5-joannelkoong@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250908185122.3199171-1-joannelkoong@gmail.com> References: <20250908185122.3199171-1-joannelkoong@gmail.com> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Store the iomap_readpage_ctx bio generically as a "void *private". This makes the read/readahead interface more generic, which allows it to be used by filesystems that may not be block-based and may not have CONFIG_BLOCK set. Signed-off-by: Joanne Koong --- fs/iomap/buffered-io.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 598998269107..a83a94bc0be9 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -358,13 +358,13 @@ struct iomap_readpage_ctx { * responsible for unlocking it when the read completes. */ bool folio_owned; - struct bio *bio; + void *private; struct readahead_control *rac; }; static void iomap_submit_read_bio(struct iomap_readpage_ctx *ctx) { - struct bio *bio = ctx->bio; + struct bio *bio = ctx->private; if (bio) submit_bio(bio); @@ -385,6 +385,7 @@ static void iomap_read_folio_range_bio_async(const struct iomap_iter *iter, size_t poff = offset_in_folio(folio, pos); loff_t length = iomap_length(iter); sector_t sector; + struct bio *bio = ctx->private; ctx->folio_owned = true; if (ifs) { @@ -394,9 +395,8 @@ static void iomap_read_folio_range_bio_async(const struct iomap_iter *iter, } sector = iomap_sector(iomap, pos); - if (!ctx->bio || - bio_end_sector(ctx->bio) != sector || - !bio_add_folio(ctx->bio, folio, plen, poff)) { + if (!bio || bio_end_sector(bio) != sector || + !bio_add_folio(bio, folio, plen, poff)) { gfp_t gfp = mapping_gfp_constraint(folio->mapping, GFP_KERNEL); gfp_t orig_gfp = gfp; unsigned int nr_vecs = DIV_ROUND_UP(length, PAGE_SIZE); @@ -405,22 +405,21 @@ static void iomap_read_folio_range_bio_async(const struct iomap_iter *iter, if (ctx->rac) /* same as readahead_gfp_mask */ gfp |= __GFP_NORETRY | __GFP_NOWARN; - ctx->bio = bio_alloc(iomap->bdev, bio_max_segs(nr_vecs), + bio = bio_alloc(iomap->bdev, bio_max_segs(nr_vecs), REQ_OP_READ, gfp); /* * If the bio_alloc fails, try it again for a single page to * avoid having to deal with partial page reads. This emulates * what do_mpage_read_folio does. */ - if (!ctx->bio) { - ctx->bio = bio_alloc(iomap->bdev, 1, REQ_OP_READ, - orig_gfp); - } + if (!bio) + bio = bio_alloc(iomap->bdev, 1, REQ_OP_READ, orig_gfp); if (ctx->rac) - ctx->bio->bi_opf |= REQ_RAHEAD; - ctx->bio->bi_iter.bi_sector = sector; - ctx->bio->bi_end_io = iomap_read_end_io; - bio_add_folio_nofail(ctx->bio, folio, plen, poff); + bio->bi_opf |= REQ_RAHEAD; + bio->bi_iter.bi_sector = sector; + bio->bi_end_io = iomap_read_end_io; + bio_add_folio_nofail(bio, folio, plen, poff); + ctx->private = bio; } } -- 2.47.3