linux-kernel - Re: [PATCH v4 03/11] fs/9p: Consolidate file operations and add readahead and writeback

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Message-ID: <Y/E2o2/NmfTyfiM5@codewreck.org>
Date:   Sun, 19 Feb 2023 05:35:47 +0900
From:   asmadeus@...ewreck.org
To:     Eric Van Hensbergen <ericvh@...il.com>
Cc:     Eric Van Hensbergen <ericvh@...nel.org>,
        v9fs-developer@...ts.sourceforge.net, rminnich@...il.com,
        lucho@...kov.net, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux_oss@...debyte.com
Subject: Re: [PATCH v4 03/11] fs/9p: Consolidate file operations and add
 readahead and writeback

Eric Van Hensbergen wrote on Sat, Feb 18, 2023 at 10:19:47AM -0600:
> ...of course, relooking at the functions in mm/filemap.c it seems like
> I can probably just use filemap_fdatawrite
> instead of having my own flush function since it basically sets up wbc
> the same way....

hmm, I was basing myself off file_write_and_wait_range that also calls
file_check_and_advance_wb_err before returning, but the wait actually
comes from fdatawrite in there...

So, right:
 - WB_SYNC is probably ok, but if we go that way let's use
filemap_fdatawrite -- less things to think about :)
 - if we want any sort of error reporting
file_check_and_advance_wb_err() is probably useful, at which point
keeping the old function is just as good. That doesn't do any wait, just
checks f_wb_err ... in a really complicated way... I don't want to have
to think about.

--
Dominique