linux-kernel - [PATCH v3 7/7] brd: Return -ENOSPC rather than -ENOMEM on page allocation failure

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Message-Id: <f79dcaa7a00de26924c563f91e22418896904167.1397429628.git.matthew.r.wilcox@intel.com>
Date:	Sun, 13 Apr 2014 18:59:56 -0400
From:	Matthew Wilcox <matthew.r.wilcox@...el.com>
To:	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>, willy@...ux.intel.com
Subject: [PATCH v3 7/7] brd: Return -ENOSPC rather than -ENOMEM on page allocation failure

brd is effectively a thinly provisioned device.  Thinly provisioned
devices return -ENOSPC when they can't write a new block.  -ENOMEM is
an implementation detail that callers shouldn't know.

Acked-by: Dave Chinner <david@...morbit.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@...el.com>
---
 drivers/block/brd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 807d3d5..c7d138e 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -200,11 +200,11 @@ static int copy_to_brd_setup(struct brd_device *brd, sector_t sector, size_t n)
 
 	copy = min_t(size_t, n, PAGE_SIZE - offset);
 	if (!brd_insert_page(brd, sector))
-		return -ENOMEM;
+		return -ENOSPC;
 	if (copy < n) {
 		sector += copy >> SECTOR_SHIFT;
 		if (!brd_insert_page(brd, sector))
-			return -ENOMEM;
+			return -ENOSPC;
 	}
 	return 0;
 }
@@ -384,7 +384,7 @@ static int brd_direct_access(struct block_device *bdev, sector_t sector,
 		return -ERANGE;
 	page = brd_insert_page(brd, sector);
 	if (!page)
-		return -ENOMEM;
+		return -ENOSPC;
 	*kaddr = page_address(page);
 	*pfn = page_to_pfn(page);
 
-- 
1.9.1

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