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block: add FALLOC_FL_WRITE_ZEROES support

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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@huawei.com>
Link: https://lore.kernel.org/20250619111806.3546162-9-yi.zhang@huaweicloud.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Zhang Yi
2025-06-19 19:18:05 +08:00
committed by Christian Brauner
parent 562108d56b
commit 912b6038fe
1 changed files with 11 additions and 1 deletions
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12
block/fops.c
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@@ -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 ((mode & FALLOC_FL_WRITE_ZEROES) &&
!bdev_write_zeroes_unmap_sectors(bdev))
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;