linux-ext4 - Re: RFC: iomap write invalidation

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Message-ID: <20200721151437.GI15516@casper.infradead.org>
Date:   Tue, 21 Jul 2020 16:14:37 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Goldwyn Rodrigues <rgoldwyn@...e.de>,
        Dave Chinner <david@...morbit.com>,
        Damien Le Moal <damien.lemoal@....com>,
        Naohiro Aota <naohiro.aota@....com>,
        Johannes Thumshirn <jth@...nel.org>,
        linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        cluster-devel@...hat.com, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org,
        Michael Kerrisk <mtk.manpages@...il.com>,
        linux-man@...r.kernel.org
Subject: Re: RFC: iomap write invalidation

On Tue, Jul 21, 2020 at 05:06:15PM +0200, Christoph Hellwig wrote:
> On Tue, Jul 21, 2020 at 04:04:32PM +0100, Matthew Wilcox wrote:
> > I thought you were going to respin this with EREMCHG changed to ENOTBLK?
> 
> Oh, true.  I'll do that ASAP.

Michael, could we add this to manpages?

--- write.2.old	2020-07-21 11:11:17.740491825 -0400
+++ write.2	2020-07-21 11:13:05.900389249 -0400
@@ -192,6 +192,12 @@
 .IR count ,
 or the file offset is not suitably aligned.
 .TP
+.B ENOTBLK
+The file was opened with the
+.B O_DIRECT
+flag, and the I/O could not be completed due to another process using
+the file.
+.TP
 .B EIO
 A low-level I/O error occurred while modifying the inode.
 This error may relate to the write-back of data written by an earlier