linux-ext4 - Re: [PATCH] iomap: Add inline data support to iomap_readpage

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Date:   Sun, 1 Jul 2018 08:21:42 +0200
From:   Christoph Hellwig <hch@....de>
To:     Andreas Gruenbacher <agruenba@...hat.com>
Cc:     Christoph Hellwig <hch@....de>, cluster-devel@...hat.com,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] iomap: Add inline data support to iomap_readpage_actor

Looks sensible, although I think it could use some more sanity checking
and a changelog.  Does the version below work for you?

---
>From e4603b7acde9b77e7a4aad6038c7ac42ca35772d Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruenba@...hat.com>
Date: Fri, 29 Jun 2018 16:44:44 +0200
Subject: iomap: Add inline data support to iomap_readpage_actor

Just copy the inline data into the page using the existing helper.

Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/iomap.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/iomap.c b/fs/iomap.c
index 4d8ff0f5ecc9..966ffad9706a 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -155,6 +155,13 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 	bool is_contig = false;
 	sector_t sector;
 
+	if (iomap->type == IOMAP_INLINE) {
+		WARN_ON_ONCE(poff);
+		WARN_ON_ONCE(plen != PAGE_SIZE);
+		iomap_read_inline_data(inode, page, iomap);
+		return PAGE_SIZE;
+	}
+
 	/* we don't support blocksize < PAGE_SIZE quite yet. */
 	WARN_ON_ONCE(pos != page_offset(page));
 	WARN_ON_ONCE(plen != PAGE_SIZE);
-- 
2.18.0