On 4/21/22 10:17 PM, David Howells wrote:
> Jeffle Xu <jeffl...@linux.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".
Right. Or users may gets confused then. Will be fixed in the next version.
>
>> -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;
>> - }
>> -
>
Sorry, it's my mistake when doing "git rebase". The previous version
(v8) actually calls cachefiles_ondemand_read() in cachefiles_read().
However as explained in the commit message of patch 5 ("cachefiles:
implement on-demand read"), fscache_read() can only detect if the
requested file range is fully cache miss, whilst it can't detect if it
is partial cache miss, i.e. there's a hole inside the requested file range.
Thus in this patchset (v9), we move the entry of calling
cachefiles_ondemand_read() from cachefiles_read() to
cachefiles_prepare_read(). The above "deletion of newly added code" is
actually reverting the previous change to cachefiles_read(). It was
mistakenly merged to this patch when I was doing "git rebase"...
Actually it should be merged to patch 5 ("cachefiles: implement
on-demand read"), which initially introduce the change to cachefiles_read().
Apologize for the careless mistake...
--
Thanks,
Jeffle
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