Patch "iomap: pass writeback errors to the mapping" has been added to the 5.13-stable tree

Sasha Levin
2021-09-16T11:46:21Z

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 5.13-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-5.13 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 a1ee334c1e3ac554e238a70b451c2425325096f6
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 9023717c5188..35839acd0004 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1045,7 +1045,7 @@ 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);