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{
    "id": 2230308,
    "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230308/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/177747214787.4107473.16073984189804321726.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": "<177747214787.4107473.16073984189804321726.stgit@frogsfrogsfrogs>",
    "date": "2026-04-29T14:56:16",
    "name": "[14/19] fuse2fs: configure block device block size",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "35aa67bba567c935d807c69e0ec0c365d2341db3",
    "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/177747214787.4107473.16073984189804321726.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/2230308/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2230308/checks/",
    "tags": {},
    "headers": {
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        "Date": "Wed, 29 Apr 2026 07:56:16 -0700",
        "Subject": "[PATCH 14/19] fuse2fs: configure block device block size",
        "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": "<177747214787.4107473.16073984189804321726.stgit@frogsfrogsfrogs>",
        "In-Reply-To": "<177747214459.4107473.9520724883867588970.stgit@frogsfrogsfrogs>",
        "References": "<177747214459.4107473.9520724883867588970.stgit@frogsfrogsfrogs>",
        "Precedence": "bulk",
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        "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"
    },
    "content": "From: Darrick J. Wong <djwong@kernel.org>\n\nSet the blocksize of the block device to the filesystem blocksize.\nThis prevents the bdev pagecache from caching file data blocks that\niomap will read and write directly.  Cache duplication is dangerous.\n\nSigned-off-by: \"Darrick J. Wong\" <djwong@kernel.org>\n---\n fuse4fs/fuse4fs.c |   43 +++++++++++++++++++++++++++++++++++++++++++\n misc/fuse2fs.c    |   43 +++++++++++++++++++++++++++++++++++++++++++\n 2 files changed, 86 insertions(+)",
    "diff": "diff --git a/fuse4fs/fuse4fs.c b/fuse4fs/fuse4fs.c\nindex f9c905c0805d9e..e92a85da0115ca 100644\n--- a/fuse4fs/fuse4fs.c\n+++ b/fuse4fs/fuse4fs.c\n@@ -6891,6 +6891,45 @@ static off_t fuse4fs_max_size(struct fuse4fs *ff, off_t upper_limit)\n \treturn res;\n }\n \n+/*\n+ * Set the block device's blocksize to the fs blocksize.\n+ *\n+ * This is required to avoid creating uptodate bdev pagecache that aliases file\n+ * data blocks because iomap reads and writes directly to file data blocks.\n+ */\n+static int fuse4fs_set_bdev_blocksize(struct fuse4fs *ff, int fd)\n+{\n+\tint blocksize = ff->fs->blocksize;\n+\tint set_error;\n+\tint ret;\n+\n+\tret = ioctl(fd, BLKBSZSET, &blocksize);\n+\tif (!ret)\n+\t\treturn 0;\n+\n+\t/*\n+\t * Save the original errno so we can report that if the block device\n+\t * blocksize isn't set in an agreeable way.\n+\t */\n+\tset_error = errno;\n+\n+\tret = ioctl(fd, BLKBSZGET, &blocksize);\n+\tif (ret)\n+\t\tgoto out_bad;\n+\n+\t/* Pretend that BLKBSZSET rejected our proposed block size */\n+\tif (blocksize > ff->fs->blocksize) {\n+\t\tset_error = EINVAL;\n+\t\tgoto out_bad;\n+\t}\n+\n+\treturn 0;\n+out_bad:\n+\terr_printf(ff, \"%s: cannot set blocksize %u: %s\\n\", __func__,\n+\t\t   blocksize, strerror(set_error));\n+\treturn -EIO;\n+}\n+\n static int fuse4fs_iomap_config_devices(struct fuse4fs *ff)\n {\n \terrcode_t err;\n@@ -6901,6 +6940,10 @@ static int fuse4fs_iomap_config_devices(struct fuse4fs *ff)\n \tif (err)\n \t\treturn translate_error(ff->fs, 0, err);\n \n+\tret = fuse4fs_set_bdev_blocksize(ff, fd);\n+\tif (ret)\n+\t\treturn ret;\n+\n \tret = fuse_lowlevel_iomap_device_add(ff->fuse, fd, 0);\n \tif (ret < 0) {\n \t\tdbg_printf(ff, \"%s: cannot register iomap dev fd=%d, err=%d\\n\",\ndiff --git a/misc/fuse2fs.c b/misc/fuse2fs.c\nindex c6472a1c45506f..c922c7fb45d311 100644\n--- a/misc/fuse2fs.c\n+++ b/misc/fuse2fs.c\n@@ -6211,6 +6211,45 @@ static off_t fuse2fs_max_size(struct fuse2fs *ff, off_t upper_limit)\n \treturn res;\n }\n \n+/*\n+ * Set the block device's blocksize to the fs blocksize.\n+ *\n+ * This is required to avoid creating uptodate bdev pagecache that aliases file\n+ * data blocks because iomap reads and writes directly to file data blocks.\n+ */\n+static int fuse2fs_set_bdev_blocksize(struct fuse2fs *ff, int fd)\n+{\n+\tint blocksize = ff->fs->blocksize;\n+\tint set_error;\n+\tint ret;\n+\n+\tret = ioctl(fd, BLKBSZSET, &blocksize);\n+\tif (!ret)\n+\t\treturn 0;\n+\n+\t/*\n+\t * Save the original errno so we can report that if the block device\n+\t * blocksize isn't set in an agreeable way.\n+\t */\n+\tset_error = errno;\n+\n+\tret = ioctl(fd, BLKBSZGET, &blocksize);\n+\tif (ret)\n+\t\tgoto out_bad;\n+\n+\t/* Pretend that BLKBSZSET rejected our proposed block size */\n+\tif (blocksize > ff->fs->blocksize) {\n+\t\tset_error = EINVAL;\n+\t\tgoto out_bad;\n+\t}\n+\n+\treturn 0;\n+out_bad:\n+\terr_printf(ff, \"%s: cannot set blocksize %u: %s\\n\", __func__,\n+\t\t   blocksize, strerror(set_error));\n+\treturn -EIO;\n+}\n+\n static int fuse2fs_iomap_config_devices(struct fuse2fs *ff)\n {\n \terrcode_t err;\n@@ -6221,6 +6260,10 @@ static int fuse2fs_iomap_config_devices(struct fuse2fs *ff)\n \tif (err)\n \t\treturn translate_error(ff->fs, 0, err);\n \n+\tret = fuse2fs_set_bdev_blocksize(ff, fd);\n+\tif (ret)\n+\t\treturn ret;\n+\n \tret = fuse_fs_iomap_device_add(fd, 0);\n \tif (ret < 0) {\n \t\tdbg_printf(ff, \"%s: cannot register iomap dev fd=%d, err=%d\\n\",\n",
    "prefixes": [
        "14/19"
    ]
}