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.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Acked-by: Dave Chinner <david@fromorbit.com>
Cc: Dheeraj Reddy <dheeraj.reddy@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 807d3d5d2fe5..c7d138eca731 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);