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GET /api/1.1/patches/2230326/?format=api
{ "id": 2230326, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230326/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/177747215717.4110581.2902242851952264152.stgit@frogsfrogsfrogs/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/1.1/projects/8/?format=api", "name": "Linux ext4 filesystem development", "link_name": "linux-ext4", "list_id": "linux-ext4.vger.kernel.org", "list_email": "linux-ext4@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<177747215717.4110581.2902242851952264152.stgit@frogsfrogsfrogs>", "date": "2026-04-29T15:01:29", "name": "[1/4] fuse2fs: enable caching of iomaps", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "1252f094e35eefa88ac6ec2e000ae10058241efc", "submitter": { "id": 77032, "url": "http://patchwork.ozlabs.org/api/1.1/people/77032/?format=api", "name": "Darrick J. Wong", "email": "djwong@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/177747215717.4110581.2902242851952264152.stgit@frogsfrogsfrogs/mbox/", "series": [ { "id": 502093, "url": "http://patchwork.ozlabs.org/api/1.1/series/502093/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=502093", "date": "2026-04-29T15:01:29", "name": "[1/4] fuse2fs: enable caching of iomaps", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502093/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230326/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230326/checks/", "tags": {}, "headers": { "Return-Path": "\n <SRS0=it20=C4=vger.kernel.org=linux-ext4+bounces-16223-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-ext4@vger.kernel.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "patchwork-incoming@ozlabs.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=Fk88YCE8;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; 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arc=none smtp.client-ip=10.30.226.201" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1777474889;\n\tbh=UchNZ+sOI1GCFZfSgmmjrxLhVsiKxaRAhoi0+Mwhm5A=;\n\th=Date:Subject:From:To:Cc:In-Reply-To:References:From;\n\tb=Fk88YCE8cWacVfhXT5p4Da1NqZ5MvmNosqeOZUklrG30XbA4Mupzm00bC+JLnRG7I\n\t Ao9rfCyBv8k7u+3wnJATfnRLxpK8zIbmyt7R9srmoE+Z5NdggoG537AR4yJysHK1EQ\n\t 9UdxskYZ5A9K4MLf/8N/j8WgIeNAH7rF5eHdCEsJ4HA2p6tEA+81FHpn7WvfaDaOGx\n\t sIv1HMiKYTYpIc6Niv3zsBhJnw/leudscWId9VOpvwFNQiF9L/P2h4zXIJ86JOpOw+\n\t 12mfw8BpI+5u77M+K5+8ssla4IrQHTc5G4GSsa9HZgFu6aaIDG88pvqb2xvIe72Fx+\n\t yE2rbzoAAmqNg==", "Date": "Wed, 29 Apr 2026 08:01:29 -0700", "Subject": "[PATCH 1/4] fuse2fs: enable caching of iomaps", "From": "\"Darrick J. Wong\" <djwong@kernel.org>", "To": "tytso@mit.edu", "Cc": "bernd@bsbernd.com, miklos@szeredi.hu, linux-ext4@vger.kernel.org,\n neal@gompa.dev, linux-fsdevel@vger.kernel.org, fuse-devel@lists.linux.dev,\n joannelkoong@gmail.com", "Message-ID": "<177747215717.4110581.2902242851952264152.stgit@frogsfrogsfrogs>", "In-Reply-To": "<177747215686.4110581.16852917113451473539.stgit@frogsfrogsfrogs>", "References": "<177747215686.4110581.16852917113451473539.stgit@frogsfrogsfrogs>", "Precedence": "bulk", "X-Mailing-List": "linux-ext4@vger.kernel.org", "List-Id": "<linux-ext4.vger.kernel.org>", "List-Subscribe": "<mailto:linux-ext4+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-ext4+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "X-Spam-Status": "No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "From: Darrick J. Wong <djwong@kernel.org>\n\nCache the iomaps we generate in the kernel for better performance.\n\nSigned-off-by: \"Darrick J. Wong\" <djwong@kernel.org>\n---\n fuse4fs/fuse4fs.c | 30 ++++++++++++++++++++++++++++++\n misc/fuse2fs.c | 29 +++++++++++++++++++++++++++++\n 2 files changed, 59 insertions(+)", "diff": "diff --git a/fuse4fs/fuse4fs.c b/fuse4fs/fuse4fs.c\nindex 9f7fe365ccdf87..56a79dd48c9f43 100644\n--- a/fuse4fs/fuse4fs.c\n+++ b/fuse4fs/fuse4fs.c\n@@ -304,6 +304,8 @@ struct fuse4fs {\n #ifdef STATX_WRITE_ATOMIC\n \tunsigned int awu_min, awu_max;\n #endif\n+\t/* options set by fuse_opt_parse must be of type int */\n+\tint iomap_cache;\n #endif\n \tunsigned int blockmask;\n \tunsigned long offset;\n@@ -2314,6 +2316,7 @@ static void fuse4fs_iomap_enable(struct fuse_conn_info *conn,\n \t\t\terr_printf(ff, \"%s\\n\", _(\"Could not enable iomap.\"));\n \t\tif (ff->iomap_passthrough_options)\n \t\t\terr_printf(ff, \"%s\\n\", _(\"Some mount options require iomap.\"));\n+\t\tff->iomap_cache = 0;\n \t\treturn;\n \t}\n }\n@@ -7169,6 +7172,28 @@ static void op_iomap_begin(fuse_req_t req, fuse_ino_t fino, uint64_t dontcare,\n \tif (opflags & FUSE_IOMAP_OP_ATOMIC)\n \t\tread.flags |= FUSE_IOMAP_F_ATOMIC_BIO;\n \n+\t/*\n+\t * For real IO operations, cache the mapping in the kernel so that we\n+\t * can reuse them for subsequent IO to the same regions. Don't let\n+\t * FIEMAP thrash the cache.\n+\t */\n+\tif (!(opflags & FUSE_IOMAP_OP_REPORT) && ff->iomap_cache) {\n+\t\tret = fuse_lowlevel_iomap_upsert_mappings(ff->fuse, fino, ino,\n+\t\t\t\t\t\t\t &read, NULL);\n+\t\tif (ret) {\n+\t\t\t/*\n+\t\t\t * Log the cache upsert error, but we can still return\n+\t\t\t * the mapping via the reply. EINVAL is the magic code\n+\t\t\t * for the kernel declining to cache the mapping.\n+\t\t\t */\n+\t\t\tif (ret != -ENOMEM && ret != -EINVAL)\n+\t\t\t\ttranslate_error(fs, ino, -ret);\n+\t\t\tgoto out_unlock;\n+\t\t}\n+\n+\t\tfuse_file_iomap_retry_cache(&read);\n+\t}\n+\n out_unlock:\n \tfuse4fs_finish(ff, ret);\n \tif (ret)\n@@ -7993,6 +8018,10 @@ static struct fuse_opt fuse4fs_opts[] = {\n #ifdef HAVE_CLOCK_MONOTONIC\n \tFUSE4FS_OPT(\"timing\",\t\ttiming,\t\t\t1),\n #endif\n+#ifdef HAVE_FUSE_IOMAP\n+\tFUSE4FS_OPT(\"iomap_cache\",\tiomap_cache,\t\t1),\n+\tFUSE4FS_OPT(\"noiomap_cache\",\tiomap_cache,\t\t0),\n+#endif\n \n #ifdef HAVE_FUSE_IOMAP\n #ifdef MS_LAZYTIME\n@@ -8487,6 +8516,7 @@ int main(int argc, char *argv[])\n \t\t.iomap_want = FT_DEFAULT,\n \t\t.iomap_state = IOMAP_UNKNOWN,\n \t\t.iomap_dev = FUSE_IOMAP_DEV_NULL,\n+\t\t.iomap_cache = 1,\n #endif\n #ifdef HAVE_FUSE_LOOPDEV\n \t\t.loop_fd = -1,\ndiff --git a/misc/fuse2fs.c b/misc/fuse2fs.c\nindex 6e4780121d5c83..e485c38bda41e8 100644\n--- a/misc/fuse2fs.c\n+++ b/misc/fuse2fs.c\n@@ -285,6 +285,8 @@ struct fuse2fs {\n #ifdef STATX_WRITE_ATOMIC\n \tunsigned int awu_min, awu_max;\n #endif\n+\t/* options set by fuse_opt_parse must be of type int */\n+\tint iomap_cache;\n #endif\n \tunsigned int blockmask;\n \tunsigned long offset;\n@@ -1870,6 +1872,7 @@ static void fuse2fs_iomap_enable(struct fuse_conn_info *conn,\n \t\t\terr_printf(ff, \"%s\\n\", _(\"Could not enable iomap.\"));\n \t\tif (ff->iomap_passthrough_options)\n \t\t\terr_printf(ff, \"%s\\n\", _(\"Some mount options require iomap.\"));\n+\t\tff->iomap_cache = 0;\n \t\treturn;\n \t}\n }\n@@ -6453,6 +6456,27 @@ static int op_iomap_begin(const char *path, uint64_t nodeid, uint64_t attr_ino,\n \tif (opflags & FUSE_IOMAP_OP_ATOMIC)\n \t\tread->flags |= FUSE_IOMAP_F_ATOMIC_BIO;\n \n+\t/*\n+\t * For real IO operations, cache the mapping in the kernel so that we\n+\t * can reuse them for subsequent IO to the same regions. Don't let\n+\t * FIEMAP thrash the cache.\n+\t */\n+\tif (!(opflags & FUSE_IOMAP_OP_REPORT) && ff->iomap_cache) {\n+\t\tret = fuse_fs_iomap_upsert(nodeid, attr_ino, read, NULL);\n+\t\tif (ret) {\n+\t\t\t/*\n+\t\t\t * Log the cache upsert error, but we can still return\n+\t\t\t * the mapping via the reply. EINVAL is the magic code\n+\t\t\t * for the kernel declining to cache the mapping.\n+\t\t\t */\n+\t\t\tif (ret != -ENOMEM && ret != -EINVAL)\n+\t\t\t\ttranslate_error(fs, attr_ino, -ret);\n+\t\t\tgoto out_unlock;\n+\t\t}\n+\n+\t\tfuse_file_iomap_retry_cache(read);\n+\t}\n+\n out_unlock:\n \tfuse2fs_finish(ff, ret);\n \treturn ret;\n@@ -7259,6 +7283,10 @@ static struct fuse_opt fuse2fs_opts[] = {\n #ifdef HAVE_CLOCK_MONOTONIC\n \tFUSE2FS_OPT(\"timing\",\t\ttiming,\t\t\t1),\n #endif\n+#ifdef HAVE_FUSE_IOMAP\n+\tFUSE2FS_OPT(\"iomap_cache\",\tiomap_cache,\t\t1),\n+\tFUSE2FS_OPT(\"noiomap_cache\",\tiomap_cache,\t\t0),\n+#endif\n \n #ifdef HAVE_FUSE_IOMAP\n #ifdef MS_LAZYTIME\n@@ -7539,6 +7567,7 @@ int main(int argc, char *argv[])\n \t\t.iomap_want = FT_DEFAULT,\n \t\t.iomap_state = IOMAP_UNKNOWN,\n \t\t.iomap_dev = FUSE_IOMAP_DEV_NULL,\n+\t\t.iomap_cache = 1,\n #endif\n #ifdef HAVE_FUSE_LOOPDEV\n \t\t.loop_fd = -1,\n", "prefixes": [ "1/4" ] }