linux-kernel - Re: [PATCH v9 06/21] cachefiles: enable on-demand read mode

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Date:   Thu, 21 Apr 2022 15:17:39 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        willy@...radead.org, linux-fsdevel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        tao.peng@...ux.alibaba.com, gerry@...ux.alibaba.com,
        eguan@...ux.alibaba.com, linux-kernel@...r.kernel.org,
        luodaowen.backend@...edance.com, tianzichen@...ishou.com,
        fannaihao@...du.com, zhangjiachen.jaycee@...edance.com
Subject: Re: [PATCH v9 06/21] cachefiles: enable on-demand read mode

Jeffle Xu <jefflexu@...ux.alibaba.com> wrote:

> +	if (IS_ENABLED(CONFIG_CACHEFILES_ONDEMAND) &&
> +	    !strcmp(args, "ondemand")) {
> +		set_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags);
> +	} else if (*args) {
> +		pr_err("'bind' command doesn't take an argument\n");

The error message isn't true if CONFIG_CACHEFILES_ONDEMAND=y.  It would be
better to say "Invalid argument to the 'bind' command".

> -retry:
>  	/* If the caller asked us to seek for data before doing the read, then
>  	 * we should do that now.  If we find a gap, we fill it with zeros.
>  	 */
> @@ -120,16 +119,6 @@ static int cachefiles_read(struct netfs_cache_resources *cres,
>  			if (read_hole == NETFS_READ_HOLE_FAIL)
>  				goto presubmission_error;
>  
> -			if (read_hole == NETFS_READ_HOLE_ONDEMAND) {
> -				ret = cachefiles_ondemand_read(object, off, len);
> -				if (ret)
> -					goto presubmission_error;
> -
> -				/* fail the read if no progress achieved */
> -				read_hole = NETFS_READ_HOLE_FAIL;
> -				goto retry;
> -			}
> -

Unexplained deletion of newly added code.

David