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block: open code __generic_file_write_iter for blkdev writes 

Open code __generic_file_write_iter to remove the indirect call into
->direct_IO and to prepare using the iomap based write code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20230801172201.1923299-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-08-01 19:21:58 +02:00 committed by Jens Axboe
parent 2ba39cc46b
commit 727cfe9767
1 changed files with 43 additions and 2 deletions
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45
block/fops.c
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@ -533,6 +533,30 @@ static int blkdev_release(struct inode *inode, struct file *filp)
return 0;
}
static ssize_t
blkdev_direct_write(struct kiocb *iocb, struct iov_iter *from)
{
size_t count = iov_iter_count(from);
ssize_t written;
written = kiocb_invalidate_pages(iocb, count);
if (written) {
if (written == -EBUSY)
return 0;
return written;
}
written = blkdev_direct_IO(iocb, from);
if (written > 0) {
kiocb_invalidate_post_direct_write(iocb, count);
iocb->ki_pos += written;
count -= written;
}
if (written != -EIOCBQUEUED)
iov_iter_revert(from, count - iov_iter_count(from));
return written;
}
/*
* Write data to the block device. Only intended for the block device itself
* and the raw driver which basically is a fake block device.
@ -542,7 +566,8 @@ static int blkdev_release(struct inode *inode, struct file *filp)
*/
static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct block_device *bdev = I_BDEV(iocb->ki_filp->f_mapping->host);
struct file *file = iocb->ki_filp;
struct block_device *bdev = I_BDEV(file->f_mapping->host);
struct inode *bd_inode = bdev->bd_inode;
loff_t size = bdev_nr_bytes(bdev);
size_t shorted = 0;
@ -569,7 +594,23 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
iov_iter_truncate(from, size);
}
ret = __generic_file_write_iter(iocb, from);
ret = file_remove_privs(file);
if (ret)
return ret;
ret = file_update_time(file);
if (ret)
return ret;
if (iocb->ki_flags & IOCB_DIRECT) {
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));
} else {
ret = generic_perform_write(iocb, from);
}
if (ret > 0)
ret = generic_write_sync(iocb, ret);
iov_iter_reexpand(from, iov_iter_count(from) + shorted);