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Wed, 16 Sep 2026 23:58:13 -0700 (PDT) From: Julian Sun To: linux-block@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Cc: axboe@kernel.dk, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, willy@infradead.org, jack@suse.cz, tj@kernel.org, akpm@linux-foundation.org Subject: [PATCH v6 1/3] block: introduce bdev_flush_by_dev() Date: Thu, 17 Sep 2026 14:57:57 +0800 Message-Id: <20260917065759.2643940-2-sunjunchao@bytedance.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260917065759.2643940-1-sunjunchao@bytedance.com> References: <20260917065759.2643940-1-sunjunchao@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: BD9091C0003 X-Stat-Signature: w811aptug1yxbuw9oyisn17dw7andw7i X-Rspam-User: X-HE-Tag: 1789628295-373769 X-HE-Meta: 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 okYWfxt+ Di6Hc15WVUPKszqfowQxQU2QZew3xVO7hQl7cEg0zqEpPBlOK+IrwDoyTSI/hkDzvp1w2ZYUic3c1Lt8voRI04scg7ECj6A9ofD49eph+3mK6e83UVJbARujmhyLfnrRLtLT2qDGljtNl1yTU5CzWvi/fBXncUkHHwqfa5QpsKUSO1eMSEB88HdSL1eq6bGYsy0E05bFK4Vbp2e4wZxXZAml40kYyk+I0lE7ADlxsbRKur2yWRhtsldprMvSz9PSBo4r7hNDQM1206xVC9pVaVKQmMykrfZX6rx0xaVKwAEs1hyKzisPGOogA6s7C0PtEalPzgOMhi8+erRudpCfieaFKgbab5S6bPZA7GpQpYCNpd4ySSK9HjDm99SAyrXHbM3P/dLZaxetn6WL2t6jEjPMR/w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add bdev_flush_by_dev() to submit page-cache writeback for a device identified by dev_t without requiring callers to hold a persistent device reference. A subsequent patch will use this helper to flush foreign bdev mappings. Signed-off-by: Julian Sun --- block/bdev.c | 24 ++++++++++++++++++++++++ include/linux/blkdev.h | 1 + 2 files changed, 25 insertions(+) diff --git a/block/bdev.c b/block/bdev.c index cd8323083740..da1fc56926fd 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -264,6 +264,30 @@ int sync_blockdev_nowait(struct block_device *bdev) } EXPORT_SYMBOL_GPL(sync_blockdev_nowait); +/** + * bdev_flush_by_dev - attempt writeback of a block device's page cache + * @dev: target block device number + * + * Skip closed devices or devices whose open_mutex is busy. + * May sleep while submitting writeback; does not wait for all I/O to complete. + */ +void bdev_flush_by_dev(dev_t dev) +{ + struct block_device *bdev; + + bdev = blkdev_get_no_open(dev, false); + if (!bdev) + return; + + /* Prevent the device from closing between the check and writeback. */ + if (mutex_trylock(&bdev->bd_disk->open_mutex)) { + if (atomic_read(&bdev->bd_openers)) + sync_blockdev_nowait(bdev); + mutex_unlock(&bdev->bd_disk->open_mutex); + } + blkdev_put_no_open(bdev); +} + /* * Write out and wait upon all the dirty data associated with a block * device via its mapping. Does not take the superblock lock. diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 4f7905c3412b..7a5f3e2f17d6 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1710,6 +1710,7 @@ void invalidate_bdev(struct block_device *bdev); int sync_blockdev(struct block_device *bdev); int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend); int sync_blockdev_nowait(struct block_device *bdev); +void bdev_flush_by_dev(dev_t dev); void sync_bdevs(bool wait); void bdev_statx(const struct path *path, struct kstat *stat, u32 request_mask); void printk_all_partitions(void); -- 2.39.5