{"id":2230342,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230342/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/177747215753.4110581.7454259395904906217.stgit@frogsfrogsfrogs/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.1/projects/8/?format=json","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":"<177747215753.4110581.7454259395904906217.stgit@frogsfrogsfrogs>","date":"2026-04-29T15:02:00","name":"[3/4] fuse4fs: upsert first file mapping to kernel on open","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"edf945a3a36998b26fce7f744b6c41e719bf13e5","submitter":{"id":77032,"url":"http://patchwork.ozlabs.org/api/1.1/people/77032/?format=json","name":"Darrick J. Wong","email":"djwong@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/177747215753.4110581.7454259395904906217.stgit@frogsfrogsfrogs/mbox/","series":[{"id":502093,"url":"http://patchwork.ozlabs.org/api/1.1/series/502093/?format=json","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/2230342/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230342/checks/","tags":{},"headers":{"Return-Path":"\n ","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=T+CXXnrC;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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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=1777474920;\n\tbh=uhOEUfzc4WLHDPaUiJemNfGMbyvGoKbxSNV7FopaEPM=;\n\th=Date:Subject:From:To:Cc:In-Reply-To:References:From;\n\tb=T+CXXnrCSHJpijbz4lmaiwiXDHuMIiKrDYsme7qllLz1L6xVLq6aj3Wji9SHJZwBd\n\t BdC7/MG1dVg7yqlqYzqKYgiduxYTTR+1HX1weEPoSSNzpgJrGx/aQitnJgCrWpW+n4\n\t dX1QeGDZs6H/ZrdlZ9HSoYkfuGG24TXsO7mOmtETWaKIwZtzDrEjqn4HqIaUVRP7V6\n\t YWu7pQam77CHMlygrzRpspDne/ynfQENAemwrs93vNG6P6AnNKMxpc1nrKitq+Ulgo\n\t ABeJDqEEl7kI2oYtG1EfG/AwWqMD+piNfXiwT3sDU3ZXBRtLcm2t81AxyOf7PxuX1b\n\t BJzsHL7KuxMjg==","Date":"Wed, 29 Apr 2026 08:02:00 -0700","Subject":"[PATCH 3/4] fuse4fs: upsert first file mapping to kernel on open","From":"\"Darrick J. Wong\" ","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":"<177747215753.4110581.7454259395904906217.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":"","List-Subscribe":"","List-Unsubscribe":"","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 \n\nTry to speed up the first access to a file by upserting the first\nfile space mapping to the kernel at open time.\n\nSigned-off-by: \"Darrick J. Wong\" \n---\n fuse4fs/fuse4fs.c | 36 +++++++++++++++++++++++++++++++++++-\n 1 file changed, 35 insertions(+), 1 deletion(-)","diff":"diff --git a/fuse4fs/fuse4fs.c b/fuse4fs/fuse4fs.c\nindex d07c576d31862a..b10a9a8be00a08 100644\n--- a/fuse4fs/fuse4fs.c\n+++ b/fuse4fs/fuse4fs.c\n@@ -4415,6 +4415,9 @@ static void detect_linux_executable_open(int kernel_flags, int *access_check,\n }\n #endif /* __linux__ */\n \n+static void fuse4fs_try_upsert_first_mapping(struct fuse4fs *ff, ext2_ino_t ino,\n+\t\t\t\t\t struct fuse_file_info *fp);\n+\n static int fuse4fs_open_file(struct fuse4fs *ff, const struct fuse_ctx *ctxt,\n \t\t\t ext2_ino_t ino, bool linked,\n \t\t\t struct fuse_file_info *fp)\n@@ -4509,7 +4512,7 @@ static int fuse4fs_open_file(struct fuse4fs *ff, const struct fuse_ctx *ctxt,\n \t/* fuse 3.5: cache dirents from readdir contents */\n \tfp->cache_readdir = 1;\n #endif\n-\n+\tfuse4fs_try_upsert_first_mapping(ff, ino, fp);\n out:\n \tif (ret)\n \t\text2fs_free_mem(&file);\n@@ -7277,6 +7280,37 @@ static void op_iomap_end(fuse_req_t req, fuse_ino_t fino, uint64_t dontcare,\n \tfuse_reply_err(req, -ret);\n }\n \n+static void fuse4fs_try_upsert_first_mapping(struct fuse4fs *ff, ext2_ino_t ino,\n+\t\t\t\t\t struct fuse_file_info *fp)\n+{\n+\tstruct ext2_inode_large inode;\n+\tstruct fuse_file_iomap read = { };\n+\tuint64_t fsize;\n+\terrcode_t err;\n+\n+\tif (!ff->iomap_cache || (fp->flags & O_TRUNC))\n+\t\treturn;\n+\n+\terr = fuse4fs_read_inode(ff->fs, ino, &inode);\n+\tif (err)\n+\t\treturn;\n+\n+\tif (!S_ISREG(inode.i_mode))\n+\t\treturn;\n+\n+\tfsize = EXT2_I_SIZE(&inode);\n+\tif (!fsize)\n+\t\treturn;\n+\n+\t/* try to map the first 64k */\n+\terr = fuse4fs_iomap_begin_read(ff, ino, &inode, 0, min(fsize, 65536),\n+\t\t\t0, &read);\n+\tif (err)\n+\t\treturn;\n+\n+\tfuse_lowlevel_iomap_upsert_mappings(ff->fuse, ino, ino, &read, NULL);\n+}\n+\n /*\n * Maximal extent format file size.\n * Resulting logical blkno at s_maxbytes must fit in our on-disk\n","prefixes":["3/4"]}