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authorChristoph Hellwig <hch@lst.de>2023-08-01 19:22:00 +0200
committerJens Axboe <axboe@kernel.dk>2023-08-02 09:13:09 -0600
commit487c607df790d366e67a7d6a30adf785cdd98e55 (patch)
treef9737bc94a5f0d017225f0eb0fc4701544a0e1de /block
parenta05f7bd9578b17521a9a5f3689f3934c082c6390 (diff)
block: use iomap for writes to block devices
Use iomap in buffer_head compat mode to write to block devices. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Reviewed-by: Pankaj Raghav <p.raghav@samsung.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Christian Brauner <brauner@kernel.org> Link: https://lore.kernel.org/r/20230801172201.1923299-6-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/Kconfig1
-rw-r--r--block/fops.c31
2 files changed, 30 insertions, 2 deletions
diff --git a/block/Kconfig b/block/Kconfig
index 86122e459fe0..1a13ef0b1ca1 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -5,6 +5,7 @@
menuconfig BLOCK
bool "Enable the block layer" if EXPERT
default y
+ select FS_IOMAP
select SBITMAP
help
Provide block layer support for the kernel.
diff --git a/block/fops.c b/block/fops.c
index f0b822c28ddf..063ece37d44e 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -15,6 +15,7 @@
#include <linux/falloc.h>
#include <linux/suspend.h>
#include <linux/fs.h>
+#include <linux/iomap.h>
#include <linux/module.h>
#include "blk.h"
@@ -386,6 +387,27 @@ static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
return __blkdev_direct_IO(iocb, iter, bio_max_segs(nr_pages));
}
+static int blkdev_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
+ unsigned int flags, struct iomap *iomap, struct iomap *srcmap)
+{
+ struct block_device *bdev = I_BDEV(inode);
+ loff_t isize = i_size_read(inode);
+
+ iomap->bdev = bdev;
+ iomap->offset = ALIGN_DOWN(offset, bdev_logical_block_size(bdev));
+ if (iomap->offset >= isize)
+ return -EIO;
+ iomap->type = IOMAP_MAPPED;
+ iomap->addr = iomap->offset;
+ iomap->length = isize - iomap->offset;
+ iomap->flags |= IOMAP_F_BUFFER_HEAD;
+ return 0;
+}
+
+static const struct iomap_ops blkdev_iomap_ops = {
+ .iomap_begin = blkdev_iomap_begin,
+};
+
static int blkdev_writepage(struct page *page, struct writeback_control *wbc)
{
return block_write_full_page(page, blkdev_get_block, wbc);
@@ -556,6 +578,11 @@ blkdev_direct_write(struct kiocb *iocb, struct iov_iter *from)
return written;
}
+static ssize_t blkdev_buffered_write(struct kiocb *iocb, struct iov_iter *from)
+{
+ return iomap_file_buffered_write(iocb, from, &blkdev_iomap_ops);
+}
+
/*
* Write data to the block device. Only intended for the block device itself
* and the raw driver which basically is a fake block device.
@@ -605,9 +632,9 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
ret = blkdev_direct_write(iocb, from);
if (ret >= 0 && iov_iter_count(from))
ret = direct_write_fallback(iocb, from, ret,
- generic_perform_write(iocb, from));
+ blkdev_buffered_write(iocb, from));
} else {
- ret = generic_perform_write(iocb, from);
+ ret = blkdev_buffered_write(iocb, from);
}
if (ret > 0)