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Message-ID: <20250604020850.1304633-10-yi.zhang@huaweicloud.com> Date: Wed, 4 Jun 2025 10:08:49 +0800 From: Zhang Yi <yi.zhang@...weicloud.com> To: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-block@...r.kernel.org, dm-devel@...ts.linux.dev, linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org Cc: linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org, hch@....de, tytso@....edu, djwong@...nel.org, john.g.garry@...cle.com, bmarzins@...hat.com, chaitanyak@...dia.com, shinichiro.kawasaki@....com, brauner@...nel.org, martin.petersen@...cle.com, yi.zhang@...wei.com, yi.zhang@...weicloud.com, chengzhihao1@...wei.com, yukuai3@...wei.com, yangerkun@...wei.com Subject: [PATCH 09/10] block: add FALLOC_FL_WRITE_ZEROES support From: Zhang Yi <yi.zhang@...wei.com> Add support for FALLOC_FL_WRITE_ZEROES, if the block device enables the unmap write zeroes operation, it will issue a write zeroes command. Signed-off-by: Zhang Yi <yi.zhang@...wei.com> --- block/fops.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/block/fops.c b/block/fops.c index e1c921549d28..050c16f5974a 100644 --- a/block/fops.c +++ b/block/fops.c @@ -841,7 +841,7 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) #define BLKDEV_FALLOC_FL_SUPPORTED \ (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ - FALLOC_FL_ZERO_RANGE) + FALLOC_FL_ZERO_RANGE | FALLOC_FL_WRITE_ZEROES) static long blkdev_fallocate(struct file *file, int mode, loff_t start, loff_t len) @@ -856,6 +856,13 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start, /* Fail if we don't recognize the flags. */ if (mode & ~BLKDEV_FALLOC_FL_SUPPORTED) return -EOPNOTSUPP; + /* + * Don't allow writing zeroes if the device does not enable the + * unmap write zeroes operation. + */ + if (!bdev_write_zeroes_unmap(bdev) && + (mode & FALLOC_FL_WRITE_ZEROES)) + return -EOPNOTSUPP; /* Don't go off the end of the device. */ isize = bdev_nr_bytes(bdev); @@ -886,6 +893,9 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start, case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE: flags = BLKDEV_ZERO_NOFALLBACK; break; + case FALLOC_FL_WRITE_ZEROES: + flags = 0; + break; default: error = -EOPNOTSUPP; goto fail; -- 2.46.1
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