Patch "iomap: pass writeback errors to the mapping" has been added to the 5.14-stable tree

Patch "iomap: pass writeback errors to the mapping" has been added to the 5.14-stable tree

[Sasha Levin]

This is a note to let you know that I've just added the patch titled

    iomap: pass writeback errors to the mapping

to the 5.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iomap-pass-writeback-errors-to-the-mapping.patch
and it can be found in the queue-5.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.



commit 140bbef57113ae67aea10307f03bb925df8589d5
Author: Darrick J. Wong <djwong@kernel.org>
Date:   Tue Aug 10 18:32:55 2021 -0700

    iomap: pass writeback errors to the mapping
    
    [ Upstream commit b69eea82d37d9ee7cfb3bf05103549dd4ed5ffc3 ]
    
    Modern-day mapping_set_error has the ability to squash the usual
    negative error code into something appropriate for long-term storage in
    a struct address_space -- ENOSPC becomes AS_ENOSPC, and everything else
    becomes EIO.  iomap squashes /everything/ to EIO, just as XFS did before
    that, but this doesn't make sense.
    
    Fix this by making it so that we can pass ENOSPC to userspace when
    writeback fails due to space problems.
    
    Signed-off-by: Darrick J. Wong <djwong@kernel.org>
    Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 87ccb3438bec..b06138c6190b 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1016,7 +1016,7 @@ iomap_finish_page_writeback(struct inode *inode, struct page *page,
 
 	if (error) {
 		SetPageError(page);
-		mapping_set_error(inode->i_mapping, -EIO);
+		mapping_set_error(inode->i_mapping, error);
 	}
 
 	WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop);