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GET /api/1.2/patches/2190724/?format=api
{ "id": 2190724, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2190724/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260130031232.60780-3-me@linux.beauty/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/1.2/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, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260130031232.60780-3-me@linux.beauty>", "list_archive_url": null, "date": "2026-01-30T03:12:31", "name": "[2/3] ext4: use READ_ONCE for lockless jinode reads", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "433be12c70858d2228b845b7ff704a2a1a9586a7", "submitter": { "id": 84264, "url": "http://patchwork.ozlabs.org/api/1.2/people/84264/?format=api", "name": "Li Chen", "email": "me@linux.beauty" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260130031232.60780-3-me@linux.beauty/mbox/", "series": [ { "id": 490324, "url": "http://patchwork.ozlabs.org/api/1.2/series/490324/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=490324", "date": "2026-01-30T03:12:31", "name": "jbd2/ext4/ocfs2: READ_ONCE for lockless jinode reads", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/490324/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2190724/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2190724/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=pzSN=AD=vger.kernel.org=linux-ext4+bounces-13435-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", 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dkim=pass (1024-bit key) header.d=linux.beauty header.i=me@linux.beauty\n header.b=RC0Gvuh4; arc=pass smtp.client-ip=136.143.188.112", "i=1; mx.zohomail.com;\n\tdkim=pass header.i=linux.beauty;\n\tspf=pass smtp.mailfrom=me@linux.beauty;\n\tdmarc=pass header.from=<me@linux.beauty>" ], "DKIM-Signature": "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1769742780;\n\ts=zmail; d=linux.beauty; i=me@linux.beauty;\n\th=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Message-Id:Reply-To;\n\tbh=avd/AUZNm7D9+j9YRkdHx4VzxdkkFbvm2wfnuocDPVo=;\n\tb=RC0Gvuh4MNWJZfwXsVBH5PbnA51XJddqMxkpo1mLYHfHRsbOTNmOnoFjkJ65AkIT\n\tsHsYaaCOe3tF+qlaZgDLq4vVk6x1b9CTD9UWno5GJ3qKNf4tmkuEago/cj8BmSOgFiV\n\t7Fn2GjQh8BX5yXOlUGJ8CBCI157pQloE3z8qP3Kg=", "From": "Li Chen <me@linux.beauty>", "To": "\"Theodore Ts'o\" <tytso@mit.edu>,\n\tAndreas Dilger <adilger.kernel@dilger.ca>,\n\tlinux-ext4@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org", "Cc": "Jan Kara <jack@suse.com>,\n\tLi Chen <me@linux.beauty>", "Subject": "[PATCH 2/3] ext4: use READ_ONCE for lockless jinode reads", "Date": "Fri, 30 Jan 2026 11:12:31 +0800", "Message-ID": "<20260130031232.60780-3-me@linux.beauty>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260130031232.60780-1-me@linux.beauty>", "References": "<20260130031232.60780-1-me@linux.beauty>", "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-Transfer-Encoding": "8bit", "X-ZohoMailClient": "External", "X-Spam-Status": "No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_MISSING,\n\tHEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "ext4 journal commit callbacks access jbd2_inode fields such as\ni_transaction and i_dirty_start/end without holding journal->j_list_lock.\n\nUse READ_ONCE() for these reads to correct the concurrency assumptions.\n\nSuggested-by: Jan Kara <jack@suse.com>\nSigned-off-by: Li Chen <me@linux.beauty>\n---\n fs/ext4/inode.c | 6 ++++--\n fs/ext4/super.c | 13 ++++++++-----\n 2 files changed, 12 insertions(+), 7 deletions(-)", "diff": "diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c\nindex d99296d7315f..2d451388e080 100644\n--- a/fs/ext4/inode.c\n+++ b/fs/ext4/inode.c\n@@ -3033,11 +3033,13 @@ static int ext4_writepages(struct address_space *mapping,\n \n int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode)\n {\n+\tloff_t dirty_start = READ_ONCE(jinode->i_dirty_start);\n+\tloff_t dirty_end = READ_ONCE(jinode->i_dirty_end);\n \tstruct writeback_control wbc = {\n \t\t.sync_mode = WB_SYNC_ALL,\n \t\t.nr_to_write = LONG_MAX,\n-\t\t.range_start = jinode->i_dirty_start,\n-\t\t.range_end = jinode->i_dirty_end,\n+\t\t.range_start = dirty_start,\n+\t\t.range_end = dirty_end,\n \t};\n \tstruct mpage_da_data mpd = {\n \t\t.inode = jinode->i_vfs_inode,\ndiff --git a/fs/ext4/super.c b/fs/ext4/super.c\nindex 5cf6c2b54bbb..acb2bc016fd4 100644\n--- a/fs/ext4/super.c\n+++ b/fs/ext4/super.c\n@@ -521,6 +521,7 @@ static bool ext4_journalled_writepage_needs_redirty(struct jbd2_inode *jinode,\n {\n \tstruct buffer_head *bh, *head;\n \tstruct journal_head *jh;\n+\ttransaction_t *trans = READ_ONCE(jinode->i_transaction);\n \n \tbh = head = folio_buffers(folio);\n \tdo {\n@@ -539,7 +540,7 @@ static bool ext4_journalled_writepage_needs_redirty(struct jbd2_inode *jinode,\n \t\t */\n \t\tjh = bh2jh(bh);\n \t\tif (buffer_dirty(bh) ||\n-\t\t (jh && (jh->b_transaction != jinode->i_transaction ||\n+\t\t (jh && (jh->b_transaction != trans ||\n \t\t\t jh->b_next_transaction)))\n \t\t\treturn true;\n \t} while ((bh = bh->b_this_page) != head);\n@@ -550,12 +551,14 @@ static bool ext4_journalled_writepage_needs_redirty(struct jbd2_inode *jinode,\n static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)\n {\n \tstruct address_space *mapping = jinode->i_vfs_inode->i_mapping;\n+\tloff_t dirty_start = READ_ONCE(jinode->i_dirty_start);\n+\tloff_t dirty_end = READ_ONCE(jinode->i_dirty_end);\n \tstruct writeback_control wbc = {\n-\t\t.sync_mode = WB_SYNC_ALL,\n+\t\t.sync_mode = WB_SYNC_ALL,\n \t\t.nr_to_write = LONG_MAX,\n-\t\t.range_start = jinode->i_dirty_start,\n-\t\t.range_end = jinode->i_dirty_end,\n- };\n+\t\t.range_start = dirty_start,\n+\t\t.range_end = dirty_end,\n+\t};\n \tstruct folio *folio = NULL;\n \tint error;\n \n", "prefixes": [ "2/3" ] }