linux-kernel - Re: [PATCH v5 03/10] fs: Initial atomic write support

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Date: Fri, 8 Mar 2024 16:52:16 +0000
From: John Garry <john.g.garry@...cle.com>
To: Jens Axboe <axboe@...nel.dk>, kbusch@...nel.org, hch@....de,
        sagi@...mberg.me, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        djwong@...nel.org, viro@...iv.linux.org.uk, brauner@...nel.org,
        dchinner@...hat.com, jack@...e.cz
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        tytso@....edu, jbongio@...gle.com, linux-scsi@...r.kernel.org,
        ojaswin@...ux.ibm.com, linux-aio@...ck.org,
        linux-btrfs@...r.kernel.org, io-uring@...r.kernel.org,
        nilay@...ux.ibm.com, ritesh.list@...il.com,
        Prasad Singamsetty <prasad.singamsetty@...cle.com>
Subject: Re: [PATCH v5 03/10] fs: Initial atomic write support

On 08/03/2024 16:34, Jens Axboe wrote:
> On 2/26/24 10:36 AM, John Garry wrote:
>> diff --git a/io_uring/rw.c b/io_uring/rw.c
>> index d5e79d9bdc71..099dda3ff151 100644
>> --- a/io_uring/rw.c
>> +++ b/io_uring/rw.c
>> @@ -719,7 +719,7 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode)
>>   	struct kiocb *kiocb = &rw->kiocb;
>>   	struct io_ring_ctx *ctx = req->ctx;
>>   	struct file *file = req->file;
>> -	int ret;
>> +	int ret, rw_type = (mode == FMODE_WRITE) ? WRITE : READ;
>>   
>>   	if (unlikely(!file || !(file->f_mode & mode)))
>>   		return -EBADF;
>> @@ -728,7 +728,7 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode)
>>   		req->flags |= io_file_get_flags(file);
>>   
>>   	kiocb->ki_flags = file->f_iocb_flags;
>> -	ret = kiocb_set_rw_flags(kiocb, rw->flags);
>> +	ret = kiocb_set_rw_flags(kiocb, rw->flags, rw_type);
>>   	if (unlikely(ret))
>>   		return ret;
>>   	kiocb->ki_flags |= IOCB_ALLOC_CACHE;
> Not sure why you took the lazy way out here rather than just pass it in,
> now there's another branhc in the hot path. NAK.

Are you saying to change io_rw_init_file() to this:

io_rw_init_file(struct io_kiocb *req, fmode_t mode, int rw_type)

And the callers can hardcode rw_type?

Thanks,
John