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GET /api/1.1/patches/2230319/?format=api
{ "id": 2230319, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230319/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/177747214838.4107473.16875762054281793441.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": "<177747214838.4107473.16875762054281793441.stgit@frogsfrogsfrogs>", "date": "2026-04-29T14:57:03", "name": "[17/19] fuse2fs: enable atomic writes", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "be9cf4d1fc45d6fea55e3a0c6d461a69a50e51e8", "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/177747214838.4107473.16875762054281793441.stgit@frogsfrogsfrogs/mbox/", "series": [ { "id": 502087, "url": "http://patchwork.ozlabs.org/api/1.1/series/502087/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=502087", "date": "2026-04-29T14:53:09", "name": "[01/19] fuse2fs: implement bare minimum iomap for file mapping reporting", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502087/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230319/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230319/checks/", "tags": {}, "headers": { "Return-Path": "\n <SRS0=5jBy=C4=vger.kernel.org=linux-ext4+bounces-16206-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=PjCDdnrz;\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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a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777474624; c=relaxed/simple;\n\tbh=HeDk+cI+KH+JqCJO5D4u2awR+sk/9tvtfvBT9S+sE/s=;\n\th=Date:Subject:From:To:Cc:Message-ID:In-Reply-To:References:\n\t MIME-Version:Content-Type;\n b=JYV+KRBp2DjYKWMIfQl3jHdY3hCfqfkl2QoqoxX9jQNjEJmGuBbaGClhnQ77ALI5UkKCZEQqodBpT04+2c3imYevy8oVFHWMcpLZJGqDyy5NR2+g07u4TkESfmYJ2TAgL+kH2TOgpak82Y1JF35Y/kjX2r7KsYNJ8w52/9gKHM0=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org;\n dkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=PjCDdnrz; dkim-atps=neutral;\n spf=pass (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=linux-ext4+bounces-16206-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org", "i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=PjCDdnrz; 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=1777474624;\n\tbh=HeDk+cI+KH+JqCJO5D4u2awR+sk/9tvtfvBT9S+sE/s=;\n\th=Date:Subject:From:To:Cc:In-Reply-To:References:From;\n\tb=PjCDdnrz+Uq68GQTUZGr50KFht+8Qqv/FRbv5MVR69jOSB47inYBUAUxX+pn81mFT\n\t UL/05tBSoQF4bRddu1rUETY7vDFiOgKorDQ6a8ebjwOA1UUFqoQnFhFETUVDOHUyuF\n\t W+lG0QKmpxxU+sDso2ySXeHpYriKhQ57khseW4HB4otLUDo1ciSPL4lRF3DUum3pzd\n\t q5yGaP/X74BcqR/G67yRrfgYc2MBSRfkXFjIHef6fuQvQ+uGVDB5nOmrMsHkBaAkMf\n\t 9gheeHmp9toUOx8MWUmmb0wajOLVdylSyvES/NWvWVnul10o5a6lhp+XgCBc51rfHd\n\t hIJdA3FZuVrWw==", "Date": "Wed, 29 Apr 2026 07:57:03 -0700", "Subject": "[PATCH 17/19] fuse2fs: enable atomic writes", "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": "<177747214838.4107473.16875762054281793441.stgit@frogsfrogsfrogs>", "In-Reply-To": "<177747214459.4107473.9520724883867588970.stgit@frogsfrogsfrogs>", "References": "<177747214459.4107473.9520724883867588970.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\nAdvertise the single-fsblock atomic write capability that iomap can do.\n\nSigned-off-by: \"Darrick J. Wong\" <djwong@kernel.org>\n---\n fuse4fs/fuse4fs.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++\n misc/fuse2fs.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++-\n 2 files changed, 134 insertions(+), 2 deletions(-)", "diff": "diff --git a/fuse4fs/fuse4fs.c b/fuse4fs/fuse4fs.c\nindex 8d994fe490e914..49708bdf7b655d 100644\n--- a/fuse4fs/fuse4fs.c\n+++ b/fuse4fs/fuse4fs.c\n@@ -297,6 +297,9 @@ struct fuse4fs {\n \tvoid (*old_alloc_stats)(ext2_filsys fs, blk64_t blk, int inuse);\n \tvoid (*old_alloc_stats_range)(ext2_filsys fs, blk64_t blk, blk_t num,\n \t\t\t\t int inuse);\n+#ifdef STATX_WRITE_ATOMIC\n+\tunsigned int awu_min, awu_max;\n+#endif\n #endif\n \tunsigned int blockmask;\n \tunsigned long offset;\n@@ -938,10 +941,22 @@ static inline bool fuse4fs_can_iomap(const struct fuse4fs *ff)\n {\n \treturn ff->iomap_cap & FUSE_IOMAP_SUPPORT_FILEIO;\n }\n+\n+static inline bool fuse4fs_iomap_supports_hw_atomic(const struct fuse4fs *ff)\n+{\n+\treturn fuse4fs_iomap_enabled(ff) &&\n+\t (ff->iomap_cap & FUSE_IOMAP_SUPPORT_ATOMIC) &&\n+#ifdef STATX_WRITE_ATOMIC\n+\t\tff->awu_max > 0 && ff->awu_min > 0;\n+#else\n+\t\t0;\n+#endif\n+}\n #else\n # define fuse4fs_iomap_enabled(...)\t(0)\n # define fuse4fs_discover_iomap(...)\t((void)0)\n # define fuse4fs_can_iomap(...)\t\t(false)\n+# define fuse4fs_iomap_supports_hw_atomic(...)\t(0)\n #endif\n \n static inline void fuse4fs_dump_extents(struct fuse4fs *ff, ext2_ino_t ino,\n@@ -2337,8 +2352,12 @@ static int fuse4fs_stat_inode(struct fuse4fs *ff, ext2_ino_t ino,\n \n \tfstat->iflags = 0;\n #ifdef HAVE_FUSE_IOMAP\n-\tif (fuse4fs_iomap_enabled(ff))\n+\tif (fuse4fs_iomap_enabled(ff)) {\n \t\tfstat->iflags |= FUSE_IFLAG_IOMAP | FUSE_IFLAG_EXCLUSIVE;\n+\n+\t\tif (fuse4fs_iomap_supports_hw_atomic(ff))\n+\t\t\tfstat->iflags |= FUSE_IFLAG_ATOMIC;\n+\t}\n #endif\n \n \treturn 0;\n@@ -2516,6 +2535,15 @@ static int fuse4fs_statx(struct fuse4fs *ff, ext2_ino_t ino, int statx_mask,\n \n \tfuse4fs_statx_directio(ff, stx);\n \n+#ifdef STATX_WRITE_ATOMIC\n+\tif (fuse4fs_iomap_supports_hw_atomic(ff)) {\n+\t\tstx->stx_mask |= STATX_WRITE_ATOMIC;\n+\t\tstx->stx_atomic_write_unit_min = ff->awu_min;\n+\t\tstx->stx_atomic_write_unit_max = ff->awu_max;\n+\t\tstx->stx_atomic_write_segments_max = 1;\n+\t}\n+#endif\n+\n \treturn 0;\n }\n \n@@ -6902,6 +6930,9 @@ static void op_iomap_begin(fuse_req_t req, fuse_ino_t fino, uint64_t dontcare,\n \t\t}\n \t}\n \n+\tif (opflags & FUSE_IOMAP_OP_ATOMIC)\n+\t\tread.flags |= FUSE_IOMAP_F_ATOMIC_BIO;\n+\n out_unlock:\n \tfuse4fs_finish(ff, ret);\n \tif (ret)\n@@ -7066,6 +7097,38 @@ static int fuse4fs_set_bdev_blocksize(struct fuse4fs *ff, int fd)\n \treturn -EIO;\n }\n \n+#ifdef STATX_WRITE_ATOMIC\n+static void fuse4fs_configure_atomic_write(struct fuse4fs *ff, int bdev_fd)\n+{\n+\tstruct statx devx;\n+\tunsigned int awu_min, awu_max;\n+\tint ret;\n+\n+\tif (!ext2fs_has_feature_extents(ff->fs->super))\n+\t\treturn;\n+\n+\tret = statx(bdev_fd, \"\", AT_EMPTY_PATH, STATX_WRITE_ATOMIC, &devx);\n+\tif (ret)\n+\t\treturn;\n+\tif (!(devx.stx_mask & STATX_WRITE_ATOMIC))\n+\t\treturn;\n+\n+\tawu_min = max(ff->fs->blocksize, devx.stx_atomic_write_unit_min);\n+\tawu_max = min(ff->fs->blocksize, devx.stx_atomic_write_unit_max);\n+\tif (awu_min > awu_max)\n+\t\treturn;\n+\n+\tlog_printf(ff, \"%s awu_min: %u, awu_max: %u\\n\",\n+\t\t _(\"Supports (experimental) DIO atomic writes\"),\n+\t\t awu_min, awu_max);\n+\n+\tff->awu_min = awu_min;\n+\tff->awu_max = awu_max;\n+}\n+#else\n+# define fuse4fs_configure_atomic_write(...)\t((void)0)\n+#endif\n+\n static int fuse4fs_iomap_config_devices(struct fuse4fs *ff)\n {\n \terrcode_t err;\n@@ -7090,6 +7153,8 @@ static int fuse4fs_iomap_config_devices(struct fuse4fs *ff)\n \tdbg_printf(ff, \"%s: registered iomap dev fd=%d iomap_dev=%u\\n\",\n \t\t __func__, fd, ff->iomap_dev);\n \n+\tfuse4fs_configure_atomic_write(ff, fd);\n+\n \tff->iomap_dev = ret;\n \treturn 0;\n }\ndiff --git a/misc/fuse2fs.c b/misc/fuse2fs.c\nindex f9e8fca096ec2c..fe45ffa86823b0 100644\n--- a/misc/fuse2fs.c\n+++ b/misc/fuse2fs.c\n@@ -280,6 +280,9 @@ struct fuse2fs {\n \tvoid (*old_alloc_stats)(ext2_filsys fs, blk64_t blk, int inuse);\n \tvoid (*old_alloc_stats_range)(ext2_filsys fs, blk64_t blk, blk_t num,\n \t\t\t\t int inuse);\n+#ifdef STATX_WRITE_ATOMIC\n+\tunsigned int awu_min, awu_max;\n+#endif\n #endif\n \tunsigned int blockmask;\n \tunsigned long offset;\n@@ -750,10 +753,22 @@ static inline bool fuse2fs_can_iomap(const struct fuse2fs *ff)\n {\n \treturn ff->iomap_cap & FUSE_IOMAP_SUPPORT_FILEIO;\n }\n+\n+static inline bool fuse2fs_iomap_supports_hw_atomic(const struct fuse2fs *ff)\n+{\n+\treturn fuse2fs_iomap_enabled(ff) &&\n+\t (ff->iomap_cap & FUSE_IOMAP_SUPPORT_ATOMIC) &&\n+#ifdef STATX_WRITE_ATOMIC\n+\t\tff->awu_max > 0 && ff->awu_min > 0;\n+#else\n+\t\t0;\n+#endif\n+}\n #else\n # define fuse2fs_iomap_enabled(...)\t(0)\n # define fuse2fs_discover_iomap(...)\t((void)0)\n # define fuse2fs_can_iomap(...)\t\t(false)\n+# define fuse2fs_iomap_supports_hw_atomic(...)\t(0)\n #endif\n \n static inline void fuse2fs_dump_extents(struct fuse2fs *ff, ext2_ino_t ino,\n@@ -1995,14 +2010,19 @@ static int op_getattr(const char *path, struct stat *statbuf,\n static int op_getattr_iflags(const char *path, struct stat *statbuf,\n \t\t\t unsigned int *iflags, struct fuse_file_info *fi)\n {\n+\tstruct fuse2fs *ff = fuse2fs_get();\n \tint ret = op_getattr(path, statbuf, fi);\n \n \tif (ret)\n \t\treturn ret;\n \n-\tif (fuse_fs_can_enable_iomap(statbuf))\n+\tif (fuse_fs_can_enable_iomap(statbuf)) {\n \t\t*iflags |= FUSE_IFLAG_IOMAP | FUSE_IFLAG_EXCLUSIVE;\n \n+\t\tif (fuse2fs_iomap_supports_hw_atomic(ff))\n+\t\t\t*iflags |= FUSE_IFLAG_ATOMIC;\n+\t}\n+\n \treturn 0;\n }\n #endif\n@@ -2111,6 +2131,16 @@ static int fuse2fs_statx(struct fuse2fs *ff, ext2_ino_t ino, int statx_mask,\n \n \tfuse2fs_statx_directio(ff, stx);\n \n+#ifdef STATX_WRITE_ATOMIC\n+\tif (fuse_fs_can_enable_iomapx(stx) &&\n+\t fuse2fs_iomap_supports_hw_atomic(ff)) {\n+\t\tstx->stx_mask |= STATX_WRITE_ATOMIC;\n+\t\tstx->stx_atomic_write_unit_min = ff->awu_min;\n+\t\tstx->stx_atomic_write_unit_max = ff->awu_max;\n+\t\tstx->stx_atomic_write_segments_max = 1;\n+\t}\n+#endif\n+\n \treturn 0;\n }\n \n@@ -6220,6 +6250,9 @@ static int op_iomap_begin(const char *path, uint64_t nodeid, uint64_t attr_ino,\n \t\t}\n \t}\n \n+\tif (opflags & FUSE_IOMAP_OP_ATOMIC)\n+\t\tread->flags |= FUSE_IOMAP_F_ATOMIC_BIO;\n+\n out_unlock:\n \tfuse2fs_finish(ff, ret);\n \treturn ret;\n@@ -6381,6 +6414,38 @@ static int fuse2fs_set_bdev_blocksize(struct fuse2fs *ff, int fd)\n \treturn -EIO;\n }\n \n+#ifdef STATX_WRITE_ATOMIC\n+static void fuse2fs_configure_atomic_write(struct fuse2fs *ff, int bdev_fd)\n+{\n+\tstruct statx devx;\n+\tunsigned int awu_min, awu_max;\n+\tint ret;\n+\n+\tif (!ext2fs_has_feature_extents(ff->fs->super))\n+\t\treturn;\n+\n+\tret = statx(bdev_fd, \"\", AT_EMPTY_PATH, STATX_WRITE_ATOMIC, &devx);\n+\tif (ret)\n+\t\treturn;\n+\tif (!(devx.stx_mask & STATX_WRITE_ATOMIC))\n+\t\treturn;\n+\n+\tawu_min = max(ff->fs->blocksize, devx.stx_atomic_write_unit_min);\n+\tawu_max = min(ff->fs->blocksize, devx.stx_atomic_write_unit_max);\n+\tif (awu_min > awu_max)\n+\t\treturn;\n+\n+\tlog_printf(ff, \"%s awu_min: %u, awu_max: %u\\n\",\n+\t\t _(\"Supports (experimental) DIO atomic writes\"),\n+\t\t awu_min, awu_max);\n+\n+\tff->awu_min = awu_min;\n+\tff->awu_max = awu_max;\n+}\n+#else\n+# define fuse2fs_configure_atomic_write(...)\t((void)0)\n+#endif\n+\n static int fuse2fs_iomap_config_devices(struct fuse2fs *ff)\n {\n \terrcode_t err;\n@@ -6405,6 +6470,8 @@ static int fuse2fs_iomap_config_devices(struct fuse2fs *ff)\n \tdbg_printf(ff, \"%s: registered iomap dev fd=%d iomap_dev=%u\\n\",\n \t\t __func__, fd, ff->iomap_dev);\n \n+\tfuse2fs_configure_atomic_write(ff, fd);\n+\n \tff->iomap_dev = ret;\n \treturn 0;\n }\n", "prefixes": [ "17/19" ] }