From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f42.google.com (mail-pj1-f42.google.com [209.85.216.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 641112F49FF for ; Tue, 16 Sep 2025 23:50:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758066652; cv=none; b=RA5bCwAE1PLxheAFipLdbP9WJs8SvCcNl9gJnsJlFQDSCtTJ8W6txKEhAwNWZIE9GJj6uMlP0gbluledt6z1IsgeCWfaXIOsRQ47MMowQPRU6oS98l0gu7GrLyCeAcZ2OpmQvE1Lw65IFRU0lYlCsJqKAVeUiY8KeflJO0SLhV8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758066652; c=relaxed/simple; bh=X5VeKxCOzUEl3wsEDYiMdyGsEejRLZ63bJIX2+ITwds=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ON+Am+r1hh/LAxCSxnpic7y78Ks8TtQ4TRXWE9kDjonag9Ure6yexPYEMewWhkFMiWUMeqvav12bt0DapLxGt49EA8J0VD/6vv4nTaqeb4ViuRW9t/ZuInR/GW0gHJwXzg/p5DqHsgf39idVPyB1Rn9+CRlgyhh6JZAx6uyLn3Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ScP8nlNS; arc=none smtp.client-ip=209.85.216.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ScP8nlNS" Received: by mail-pj1-f42.google.com with SMTP id 98e67ed59e1d1-32326e2f0b3so5182607a91.2 for ; Tue, 16 Sep 2025 16:50:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1758066650; x=1758671450; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=4zQULdjLrk3RHQ78+SXdGM3zZbqfDbjmRNccIhvDiRQ=; b=ScP8nlNS1QqvGsHjbF3ELhWgU3Vvpq1S37+8QLfIV3oHwSYAPUXzM96TfDFJLIJYFr t/Fa/nuw4cxS7jcShT4PuT8a2nTNs7RIx91pYu3cYsd0xYx7QkQFDyjComfLb1rTlx0+ 4tHSueOm59KHnScsGF7PVth/zVceXA/gSjkRACBTBiqUQ7JaXZDdTf/hV4azKp1bWqq7 t/iWiuFCWk9DU6uTtRYNqEE+M75W7SeJWey66vA1S+kfgRgQta6FCNb59KP1TA5lvWJS yqKvY85oPQx7IGZ3RTe1cq2vae5xjhN5TJk7IULV6uEvCc/8PfBbU0xZtpzWOdt74ytB HI8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758066650; x=1758671450; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4zQULdjLrk3RHQ78+SXdGM3zZbqfDbjmRNccIhvDiRQ=; b=icZC056o8mIbhtvTWaKY87TP2uFWeg2I9DaueYtSxBkgFas55Hsp6NDqBnwogKmWKN dx1UWWVdo3iHWhZLm1NxoNqslwri09BYdDZf2Bu/1sRIA5iDdn0zdaUIFiVt3PWRqUMe hJo+38hkjsUnATGYpIj42nKVujxXDmfHjbAPxaqOkxAuH3Jq/yIA/7lYQ8dQA/mF91aK WRgpXzP7Qw45HCfF5bwlM6JbPVHAqdsyG/0ejkCEGxtqwo1qa979UNj8rH6sGdnXUYpC hoPimgFPDq2jSyvpDVgqu+zervz1vNW0KTu+GFULAv608Slhs6lLBGV0JC8yY90jRPRu 3nfw== X-Forwarded-Encrypted: i=1; AJvYcCVKEd3GiScvuGIrmNsVbQPlklD/F0iBj7v8eXlZEvLm7HRoSkIKhJ52/1h+T10GvJAaXXiaH4/73JBRRw==@vger.kernel.org X-Gm-Message-State: AOJu0YwSNIgUPDcK1u9yLk2/vsZC+l9jI38qdcoKrHIVgF0pQOqktIxw Agj9wxkIjyVBaXBZvcGjTr35j/T45VtP4hwR749Llna2ATmGG41o1rfv X-Gm-Gg: ASbGncvLHwUusuQvmREjFon/KctzfUFf0pyJUu81KUvo0Viwa0t/12hdu12E79B037t 1vW8BN07vkpxTM2mixsmreDYxPVMB0HuW4O6zu3pK5H4TOiNaHRQUjwhK/YUp2ho+P0GUfGK+8x S1tizFNvjbSDPYwctY9caEg90fMKu/2Pxe7jxBq9zb6mh1Q5iROz8IdLZrKh+/KFQI3S/0RNEeu rFWm/KmFF3Bv8hv7EIi4faqYJaCY8LMOIdJ0dAG1imqN9+Q2cBWImMYI039huTTnSBjWrx0VMAy +ZeQAkxRkRZzwMHe2TD/E60VNyKAXMQoZTSqZ5GtdKwP6Pjq1EVAKYr/WfJxz4CDGqzo04MAvon IXL9hLaQC8OcBkTkxcJ1yPfqrS3i645A8lpiZs215ijj+wpjaMlL31eEH7peBF3wfI5lE2ppdnn 6ulg== X-Google-Smtp-Source: AGHT+IF3/Qq+e6C8ki6sfdZo/ufgl6Uw/vgFAFRQyV5O6PlrdhNwHnRCfnw8PwqYcBwvdrnS//+vpA== X-Received: by 2002:a17:90b:4c4c:b0:32e:7270:94b5 with SMTP id 98e67ed59e1d1-32ee3f141e1mr189294a91.23.1758066649702; Tue, 16 Sep 2025 16:50:49 -0700 (PDT) Received: from localhost ([2a03:2880:ff:2::]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-32ea3c6fefdsm1695880a91.3.2025.09.16.16.50.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Sep 2025 16:50:49 -0700 (PDT) From: Joanne Koong To: brauner@kernel.org, miklos@szeredi.hu Cc: hch@infradead.org, djwong@kernel.org, hsiangkao@linux.alibaba.com, linux-block@vger.kernel.org, gfs2@lists.linux.dev, linux-fsdevel@vger.kernel.org, kernel-team@meta.com, linux-xfs@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v3 15/15] fuse: remove fc->blkbits workaround for partial writes Date: Tue, 16 Sep 2025 16:44:25 -0700 Message-ID: <20250916234425.1274735-16-joannelkoong@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250916234425.1274735-1-joannelkoong@gmail.com> References: <20250916234425.1274735-1-joannelkoong@gmail.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Now that fuse is integrated with iomap for read/readahead, we can remove the workaround that was added in commit bd24d2108e9c ("fuse: fix fuseblk i_blkbits for iomap partial writes"), which was previously needed to avoid a race condition where an iomap partial write may be overwritten by a read if blocksize < PAGE_SIZE. Now that fuse does iomap read/readahead, this is protected against since there is granular uptodate tracking of blocks, which means this workaround can be removed. Signed-off-by: Joanne Koong --- fs/fuse/dir.c | 2 +- fs/fuse/fuse_i.h | 8 -------- fs/fuse/inode.c | 13 +------------ 3 files changed, 2 insertions(+), 21 deletions(-) diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 5c569c3cb53f..ebee7e0b1cd3 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1199,7 +1199,7 @@ static void fuse_fillattr(struct mnt_idmap *idmap, struct inode *inode, if (attr->blksize != 0) blkbits = ilog2(attr->blksize); else - blkbits = fc->blkbits; + blkbits = inode->i_sb->s_blocksize_bits; stat->blksize = 1 << blkbits; } diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index cc428d04be3e..1647eb7ca6fa 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -975,14 +975,6 @@ struct fuse_conn { /* Request timeout (in jiffies). 0 = no timeout */ unsigned int req_timeout; } timeout; - - /* - * This is a workaround until fuse uses iomap for reads. - * For fuseblk servers, this represents the blocksize passed in at - * mount time and for regular fuse servers, this is equivalent to - * inode->i_blkbits. - */ - u8 blkbits; }; /* diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index fdecd5a90dee..5899a47faaef 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -292,7 +292,7 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, if (attr->blksize) fi->cached_i_blkbits = ilog2(attr->blksize); else - fi->cached_i_blkbits = fc->blkbits; + fi->cached_i_blkbits = inode->i_sb->s_blocksize_bits; /* * Don't set the sticky bit in i_mode, unless we want the VFS @@ -1810,21 +1810,10 @@ int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx) err = -EINVAL; if (!sb_set_blocksize(sb, ctx->blksize)) goto err; - /* - * This is a workaround until fuse hooks into iomap for reads. - * Use PAGE_SIZE for the blocksize else if the writeback cache - * is enabled, buffered writes go through iomap and a read may - * overwrite partially written data if blocksize < PAGE_SIZE - */ - fc->blkbits = sb->s_blocksize_bits; - if (ctx->blksize != PAGE_SIZE && - !sb_set_blocksize(sb, PAGE_SIZE)) - goto err; #endif } else { sb->s_blocksize = PAGE_SIZE; sb->s_blocksize_bits = PAGE_SHIFT; - fc->blkbits = sb->s_blocksize_bits; } sb->s_subtype = ctx->subtype; -- 2.47.3