From patchwork Wed Aug 11 19:18:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. Wong" X-Patchwork-Id: 12431781 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D1F3872 for ; Wed, 11 Aug 2021 19:18:26 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 5DEAA60EB9; Wed, 11 Aug 2021 19:18:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628709506; bh=UdgfDXXujrxmL4idohc3c8tjVe5qH4DuaJJFmReZljk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=UcrvppARhMk3/ieOBELNzLrP6bwuX6v0LGfsYUJ9OOg+y+jPUPgxfBSz6J2SwZBoP kjud+1G40MDhqwvk5vS6EzOeVT2VkL4yBAC2zYMWaYh2iqgui/mKDVBKQXbgNhburM ZaI7CggvvKuhT0FjWhJlE3oHyELyXXdb/tfbAfXXl8qrIl60p3leTVkn34dUdMSP1I AOGh+3YQEvhw9i6+k4GHfGpSssouXQcrOErxLhRq6LfkXcccmiNknS1Cx9PeQ/WUtI naJ3TSKa3WkfW+PrQjpgNY+quQ4PIeyZnOAmk73qqpttJ6U+5Fb71BHHBJdfDa5U+f fgddqM58qFo/A== Date: Wed, 11 Aug 2021 12:18:26 -0700 From: "Darrick J. Wong" To: Christoph Hellwig Cc: Dan Williams , Matthew Wilcox , Andreas Gruenbacher , Shiyang Ruan , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, nvdimm@lists.linux.dev, cluster-devel@redhat.com Subject: [PATCH v2.1 24/30] iomap: remove iomap_apply Message-ID: <20210811191826.GI3601443@magnolia> References: <20210809061244.1196573-1-hch@lst.de> <20210809061244.1196573-25-hch@lst.de> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210809061244.1196573-25-hch@lst.de> From: Christoph Hellwig iomap_apply is unused now, so remove it. Signed-off-by: Christoph Hellwig [djwong: rebase this patch to preserve git history of iomap loop control] Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner --- fs/iomap/apply.c | 91 ------------------------------------------------- fs/iomap/trace.h | 40 ---------------------- include/linux/iomap.h | 10 ----- 3 files changed, 141 deletions(-) diff --git a/fs/iomap/apply.c b/fs/iomap/apply.c index e82647aef7ea..a1c7592d2ade 100644 --- a/fs/iomap/apply.c +++ b/fs/iomap/apply.c @@ -3,101 +3,10 @@ * Copyright (C) 2010 Red Hat, Inc. * Copyright (c) 2016-2021 Christoph Hellwig. */ -#include -#include #include #include #include "trace.h" -/* - * Execute a iomap write on a segment of the mapping that spans a - * contiguous range of pages that have identical block mapping state. - * - * This avoids the need to map pages individually, do individual allocations - * for each page and most importantly avoid the need for filesystem specific - * locking per page. Instead, all the operations are amortised over the entire - * range of pages. It is assumed that the filesystems will lock whatever - * resources they require in the iomap_begin call, and release them in the - * iomap_end call. - */ -loff_t -iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags, - const struct iomap_ops *ops, void *data, iomap_actor_t actor) -{ - struct iomap iomap = { .type = IOMAP_HOLE }; - struct iomap srcmap = { .type = IOMAP_HOLE }; - loff_t written = 0, ret; - u64 end; - - trace_iomap_apply(inode, pos, length, flags, ops, actor, _RET_IP_); - - /* - * Need to map a range from start position for length bytes. This can - * span multiple pages - it is only guaranteed to return a range of a - * single type of pages (e.g. all into a hole, all mapped or all - * unwritten). Failure at this point has nothing to undo. - * - * If allocation is required for this range, reserve the space now so - * that the allocation is guaranteed to succeed later on. Once we copy - * the data into the page cache pages, then we cannot fail otherwise we - * expose transient stale data. If the reserve fails, we can safely - * back out at this point as there is nothing to undo. - */ - ret = ops->iomap_begin(inode, pos, length, flags, &iomap, &srcmap); - if (ret) - return ret; - if (WARN_ON(iomap.offset > pos)) { - written = -EIO; - goto out; - } - if (WARN_ON(iomap.length == 0)) { - written = -EIO; - goto out; - } - - trace_iomap_apply_dstmap(inode, &iomap); - if (srcmap.type != IOMAP_HOLE) - trace_iomap_apply_srcmap(inode, &srcmap); - - /* - * Cut down the length to the one actually provided by the filesystem, - * as it might not be able to give us the whole size that we requested. - */ - end = iomap.offset + iomap.length; - if (srcmap.type != IOMAP_HOLE) - end = min(end, srcmap.offset + srcmap.length); - if (pos + length > end) - length = end - pos; - - /* - * Now that we have guaranteed that the space allocation will succeed, - * we can do the copy-in page by page without having to worry about - * failures exposing transient data. - * - * To support COW operations, we read in data for partially blocks from - * the srcmap if the file system filled it in. In that case we the - * length needs to be limited to the earlier of the ends of the iomaps. - * If the file system did not provide a srcmap we pass in the normal - * iomap into the actors so that they don't need to have special - * handling for the two cases. - */ - written = actor(inode, pos, length, data, &iomap, - srcmap.type != IOMAP_HOLE ? &srcmap : &iomap); - -out: - /* - * Now the data has been copied, commit the range we've copied. This - * should not fail unless the filesystem has had a fatal error. - */ - if (ops->iomap_end) { - ret = ops->iomap_end(inode, pos, length, - written > 0 ? written : 0, - flags, &iomap); - } - - return written ? written : ret; -} - static inline int iomap_iter_advance(struct iomap_iter *iter) { /* handle the previous iteration (if any) */ diff --git a/fs/iomap/trace.h b/fs/iomap/trace.h index 1012d7af6b68..f1519f9a1403 100644 --- a/fs/iomap/trace.h +++ b/fs/iomap/trace.h @@ -138,49 +138,9 @@ DECLARE_EVENT_CLASS(iomap_class, DEFINE_EVENT(iomap_class, name, \ TP_PROTO(struct inode *inode, struct iomap *iomap), \ TP_ARGS(inode, iomap)) -DEFINE_IOMAP_EVENT(iomap_apply_dstmap); -DEFINE_IOMAP_EVENT(iomap_apply_srcmap); DEFINE_IOMAP_EVENT(iomap_iter_dstmap); DEFINE_IOMAP_EVENT(iomap_iter_srcmap); -TRACE_EVENT(iomap_apply, - TP_PROTO(struct inode *inode, loff_t pos, loff_t length, - unsigned int flags, const void *ops, void *actor, - unsigned long caller), - TP_ARGS(inode, pos, length, flags, ops, actor, caller), - TP_STRUCT__entry( - __field(dev_t, dev) - __field(u64, ino) - __field(loff_t, pos) - __field(loff_t, length) - __field(unsigned int, flags) - __field(const void *, ops) - __field(void *, actor) - __field(unsigned long, caller) - ), - TP_fast_assign( - __entry->dev = inode->i_sb->s_dev; - __entry->ino = inode->i_ino; - __entry->pos = pos; - __entry->length = length; - __entry->flags = flags; - __entry->ops = ops; - __entry->actor = actor; - __entry->caller = caller; - ), - TP_printk("dev %d:%d ino 0x%llx pos %lld length %lld flags %s (0x%x) " - "ops %ps caller %pS actor %ps", - MAJOR(__entry->dev), MINOR(__entry->dev), - __entry->ino, - __entry->pos, - __entry->length, - __print_flags(__entry->flags, "|", IOMAP_FLAGS_STRINGS), - __entry->flags, - __entry->ops, - (void *)__entry->caller, - __entry->actor) -); - TRACE_EVENT(iomap_iter, TP_PROTO(struct iomap_iter *iter, const void *ops, unsigned long caller), diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 66e04aedd2ca..6784a8b64714 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -217,16 +217,6 @@ static inline struct iomap *iomap_iter_srcmap(struct iomap_iter *i) return &i->iomap; } -/* - * Main iomap iterator function. - */ -typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len, - void *data, struct iomap *iomap, struct iomap *srcmap); - -loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length, - unsigned flags, const struct iomap_ops *ops, void *data, - iomap_actor_t actor); - ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from, const struct iomap_ops *ops); int iomap_readpage(struct page *page, const struct iomap_ops *ops);