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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>
hifive-unleashed-5.1
Matthew Wilcox 2014-06-04 16:07:50 -07:00 committed by Linus Torvalds
parent a72132c31d
commit 96f8d8e096
1 changed files with 3 additions and 3 deletions
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6
drivers/block/brd.c
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@ -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);