{"id":2226024,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2226024/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-16-yi.zhang@huaweicloud.com/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.2/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,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260422021042.4157510-16-yi.zhang@huaweicloud.com>","list_archive_url":null,"date":"2026-04-22T02:10:35","name":"[v3,15/22] ext4: add block mapping tracepoints for iomap buffered I/O path","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"6b584cc46bcfbf502f5c94edd055a3c42fcade79","submitter":{"id":85428,"url":"http://patchwork.ozlabs.org/api/1.2/people/85428/?format=json","name":"Zhang Yi","email":"yi.zhang@huaweicloud.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-16-yi.zhang@huaweicloud.com/mbox/","series":[{"id":500911,"url":"http://patchwork.ozlabs.org/api/1.2/series/500911/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/list/?series=500911","date":"2026-04-22T02:10:23","name":"ext4: use iomap for regular file's buffered I/O path","version":3,"mbox":"http://patchwork.ozlabs.org/series/500911/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226024/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226024/checks/","tags":{},"related":[],"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 spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n 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envelope-from=linux-ext4+bounces-15987-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org","i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51"],"From":"Zhang Yi ","To":"linux-ext4@vger.kernel.org,\n\tlinux-fsdevel@vger.kernel.org","Cc":"linux-kernel@vger.kernel.org,\n\ttytso@mit.edu,\n\tadilger.kernel@dilger.ca,\n\tlibaokun@linux.alibaba.com,\n\tjack@suse.cz,\n\tojaswin@linux.ibm.com,\n\tritesh.list@gmail.com,\n\tdjwong@kernel.org,\n\thch@infradead.org,\n\tyi.zhang@huawei.com,\n\tyi.zhang@huaweicloud.com,\n\tyizhang089@gmail.com,\n\tyangerkun@huawei.com,\n\tyukuai@fnnas.com","Subject":"[PATCH v3 15/22] ext4: add block mapping tracepoints for iomap\n buffered I/O path","Date":"Wed, 22 Apr 2026 10:10:35 +0800","Message-ID":"<20260422021042.4157510-16-yi.zhang@huaweicloud.com>","X-Mailer":"git-send-email 2.52.0","In-Reply-To":"<20260422021042.4157510-1-yi.zhang@huaweicloud.com>","References":"<20260422021042.4157510-1-yi.zhang@huaweicloud.com>","Precedence":"bulk","X-Mailing-List":"linux-ext4@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"_Ch0CgB3JL6PL+hpqkgUBQ--.2635S19","X-Coremail-Antispam":"1UD129KBjvJXoWxurW7ZrWDAFWkXF17WF18uFg_yoWrGr4fpa\n\t4vyFy5GF4fXrsF9w4fWrW3XF1Fva1xKr4UGry3Wry5AFWxtr42gF4UGFyjyFy5Jw4jkryf\n\tXF4Ykry8G3WUurDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUmS14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0\n\trVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI\n\tkIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2\n\tz4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F\n\t4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq\n\t3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7\n\tIYx2IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U\n\tM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2\n\tkIc2xKxwCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkE\n\tbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67\n\tAF67kF1VAFwI0_GFv_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVW8JVW5JwCI\n\t42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF\n\t4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBI\n\tdaVFxhVjvjDU0xZFpf9x0JUWMKtUUUUU=","X-CM-SenderInfo":"d1lo6xhdqjqx5xdzvxpfor3voofrz/","X-Spam-Status":"No, score=-1.1 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDMARC_MISSING,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"},"content":"From: Zhang Yi \n\nAdd tracepoints for iomap buffered read, write, partial block zeroing,\nand writeback operations to help debug the iomap buffered I/O path.\n\nSigned-off-by: Zhang Yi \n---\n fs/ext4/inode.c | 6 +++++\n include/trace/events/ext4.h | 45 +++++++++++++++++++++++++++++++++++++\n 2 files changed, 51 insertions(+)","diff":"diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c\nindex 701b912db6fb..53fdcb50f3dd 100644\n--- a/fs/ext4/inode.c\n+++ b/fs/ext4/inode.c\n@@ -3961,6 +3961,8 @@ static int ext4_iomap_buffered_read_begin(struct inode *inode, loff_t offset,\n \tif (ret < 0)\n \t\treturn ret;\n \n+\ttrace_ext4_iomap_buffered_read_begin(inode, &map, offset, length,\n+\t\t\t\t\t flags);\n \text4_set_iomap(inode, iomap, &map, offset, length, flags);\n \treturn 0;\n }\n@@ -4036,6 +4038,8 @@ static int ext4_iomap_buffered_do_write_begin(struct inode *inode,\n \tif (ret < 0)\n \t\treturn ret;\n \n+\ttrace_ext4_iomap_buffered_write_begin(inode, &map, offset, length,\n+\t\t\t\t\t flags);\n \text4_set_iomap(inode, iomap, &map, offset, length, flags);\n \treturn 0;\n }\n@@ -4138,6 +4142,7 @@ static int ext4_iomap_zero_begin(struct inode *inode,\n \t\t\tmap.m_len = (offset >> blkbits) - map.m_lblk;\n \t}\n \n+\ttrace_ext4_iomap_zero_begin(inode, &map, offset, length, flags);\n \text4_set_iomap(inode, iomap, &map, offset, length, flags);\n \tiomap->flags |= iomap_flags;\n \n@@ -4306,6 +4311,7 @@ static int ext4_iomap_map_writeback_range(struct iomap_writepage_ctx *wpc,\n \t\treturn ret;\n \t}\n out:\n+\ttrace_ext4_iomap_map_writeback_range(inode, &map, offset, dirty_len, 0);\n \text4_set_iomap(inode, &wpc->iomap, &map, offset, dirty_len, 0);\n \treturn 0;\n }\ndiff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h\nindex f493642cf121..ebafa06cd191 100644\n--- a/include/trace/events/ext4.h\n+++ b/include/trace/events/ext4.h\n@@ -3096,6 +3096,51 @@ TRACE_EVENT(ext4_move_extent_exit,\n \t\t __entry->ret)\n );\n \n+DECLARE_EVENT_CLASS(ext4_set_iomap_class,\n+\tTP_PROTO(struct inode *inode, struct ext4_map_blocks *map,\n+\t\t loff_t offset, loff_t length, unsigned int flags),\n+\tTP_ARGS(inode, map, offset, length, flags),\n+\tTP_STRUCT__entry(\n+\t\t__field(dev_t, dev)\n+\t\t__field(u64, ino)\n+\t\t__field(ext4_lblk_t, m_lblk)\n+\t\t__field(unsigned int, m_len)\n+\t\t__field(unsigned int, m_flags)\n+\t\t__field(u64, m_seq)\n+\t\t__field(loff_t, offset)\n+\t\t__field(loff_t, length)\n+\t\t__field(unsigned int, iomap_flags)\n+\t),\n+\tTP_fast_assign(\n+\t\t__entry->dev\t\t= inode->i_sb->s_dev;\n+\t\t__entry->ino\t\t= inode->i_ino;\n+\t\t__entry->m_lblk\t\t= map->m_lblk;\n+\t\t__entry->m_len\t\t= map->m_len;\n+\t\t__entry->m_flags\t= map->m_flags;\n+\t\t__entry->m_seq\t\t= map->m_seq;\n+\t\t__entry->offset\t\t= offset;\n+\t\t__entry->length\t\t= length;\n+\t\t__entry->iomap_flags\t= flags;\n+\n+\t),\n+\tTP_printk(\"dev %d:%d ino %llu m_lblk %u m_len %u m_flags %s m_seq %llu orig_off 0x%llx orig_len 0x%llx iomap_flags 0x%x\",\n+\t\t MAJOR(__entry->dev), MINOR(__entry->dev),\n+\t\t __entry->ino, __entry->m_lblk, __entry->m_len,\n+\t\t show_mflags(__entry->m_flags), __entry->m_seq,\n+\t\t __entry->offset, __entry->length, __entry->iomap_flags)\n+)\n+\n+#define DEFINE_SET_IOMAP_EVENT(name) \\\n+DEFINE_EVENT(ext4_set_iomap_class, name, \\\n+\tTP_PROTO(struct inode *inode, struct ext4_map_blocks *map, \\\n+\t\t loff_t offset, loff_t length, unsigned int flags), \\\n+\tTP_ARGS(inode, map, offset, length, flags))\n+\n+DEFINE_SET_IOMAP_EVENT(ext4_iomap_buffered_read_begin);\n+DEFINE_SET_IOMAP_EVENT(ext4_iomap_buffered_write_begin);\n+DEFINE_SET_IOMAP_EVENT(ext4_iomap_map_writeback_range);\n+DEFINE_SET_IOMAP_EVENT(ext4_iomap_zero_begin);\n+\n #endif /* _TRACE_EXT4_H */\n \n /* This part must be outside protection */\n","prefixes":["v3","15/22"]}