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>
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 @@
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 @@
return -ERANGE;
page = brd_insert_page(brd, sector);
if (!page)
- return -ENOMEM;
+ return -ENOSPC;
*kaddr = page_address(page);
*pfn = page_to_pfn(page);