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Mon, 22 Sep 2025 17:33:53 -0700 (PDT) From: Joanne Koong To: brauner@kernel.org, miklos@szeredi.hu Cc: djwong@kernel.org, hch@infradead.org, linux-block@vger.kernel.org, gfs2@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-doc@vger.kernel.org, hsiangkao@linux.alibaba.com, kernel-team@meta.com Subject: [PATCH v4 01/15] iomap: move bio read logic into helper function Date: Mon, 22 Sep 2025 17:23:39 -0700 Message-ID: <20250923002353.2961514-2-joannelkoong@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250923002353.2961514-1-joannelkoong@gmail.com> References: <20250923002353.2961514-1-joannelkoong@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Move the iomap_readpage_iter() bio read logic into a separate helper function, iomap_bio_read_folio_range(). This is needed to make iomap read/readahead more generically usable, especially for filesystems that do not require CONFIG_BLOCK. Additionally rename buffered write's iomap_read_folio_range() function to iomap_bio_read_folio_range_sync() to better describe its synchronous behavior. Signed-off-by: Joanne Koong Reviewed-by: "Darrick J. Wong" --- fs/iomap/buffered-io.c | 68 ++++++++++++++++++++++++------------------ 1 file changed, 39 insertions(+), 29 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 9535733ed07a..7e65075b6345 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -367,36 +367,15 @@ struct iomap_readpage_ctx { struct readahead_control *rac; }; -static int iomap_readpage_iter(struct iomap_iter *iter, - struct iomap_readpage_ctx *ctx) +static void iomap_bio_read_folio_range(const struct iomap_iter *iter, + struct iomap_readpage_ctx *ctx, loff_t pos, size_t plen) { + struct folio *folio = ctx->cur_folio; const struct iomap *iomap = &iter->iomap; - loff_t pos = iter->pos; + struct iomap_folio_state *ifs = folio->private; + size_t poff = offset_in_folio(folio, pos); loff_t length = iomap_length(iter); - struct folio *folio = ctx->cur_folio; - struct iomap_folio_state *ifs; - size_t poff, plen; sector_t sector; - int ret; - - if (iomap->type == IOMAP_INLINE) { - ret = iomap_read_inline_data(iter, folio); - if (ret) - return ret; - return iomap_iter_advance(iter, length); - } - - /* zero post-eof blocks as the page may be mapped */ - ifs = ifs_alloc(iter->inode, folio, iter->flags); - iomap_adjust_read_range(iter->inode, folio, &pos, length, &poff, &plen); - if (plen == 0) - goto done; - - if (iomap_block_needs_zeroing(iter, pos)) { - folio_zero_range(folio, poff, plen); - iomap_set_range_uptodate(folio, poff, plen); - goto done; - } ctx->cur_folio_in_bio = true; if (ifs) { @@ -435,6 +414,37 @@ static int iomap_readpage_iter(struct iomap_iter *iter, ctx->bio->bi_end_io = iomap_read_end_io; bio_add_folio_nofail(ctx->bio, folio, plen, poff); } +} + +static int iomap_readpage_iter(struct iomap_iter *iter, + struct iomap_readpage_ctx *ctx) +{ + const struct iomap *iomap = &iter->iomap; + loff_t pos = iter->pos; + loff_t length = iomap_length(iter); + struct folio *folio = ctx->cur_folio; + size_t poff, plen; + int ret; + + if (iomap->type == IOMAP_INLINE) { + ret = iomap_read_inline_data(iter, folio); + if (ret) + return ret; + return iomap_iter_advance(iter, length); + } + + /* zero post-eof blocks as the page may be mapped */ + ifs_alloc(iter->inode, folio, iter->flags); + iomap_adjust_read_range(iter->inode, folio, &pos, length, &poff, &plen); + if (plen == 0) + goto done; + + if (iomap_block_needs_zeroing(iter, pos)) { + folio_zero_range(folio, poff, plen); + iomap_set_range_uptodate(folio, poff, plen); + } else { + iomap_bio_read_folio_range(iter, ctx, pos, plen); + } done: /* @@ -559,7 +569,7 @@ void iomap_readahead(struct readahead_control *rac, const struct iomap_ops *ops) } EXPORT_SYMBOL_GPL(iomap_readahead); -static int iomap_read_folio_range(const struct iomap_iter *iter, +static int iomap_bio_read_folio_range_sync(const struct iomap_iter *iter, struct folio *folio, loff_t pos, size_t len) { const struct iomap *srcmap = iomap_iter_srcmap(iter); @@ -572,7 +582,7 @@ static int iomap_read_folio_range(const struct iomap_iter *iter, return submit_bio_wait(&bio); } #else -static int iomap_read_folio_range(const struct iomap_iter *iter, +static int iomap_bio_read_folio_range_sync(const struct iomap_iter *iter, struct folio *folio, loff_t pos, size_t len) { WARN_ON_ONCE(1); @@ -749,7 +759,7 @@ static int __iomap_write_begin(const struct iomap_iter *iter, status = write_ops->read_folio_range(iter, folio, block_start, plen); else - status = iomap_read_folio_range(iter, + status = iomap_bio_read_folio_range_sync(iter, folio, block_start, plen); if (status) return status; -- 2.47.3