[PATCH] Add error message explaining why opening a device failed

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Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxxx>
---
 disk-io.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/disk-io.c b/disk-io.c
index 9e0cfe8..5986709 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -530,7 +530,8 @@ struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
 
 	fp = open(filename, flags, 0600);
 	if (fp < 0) {
-		fprintf (stderr, "Could not open %s\n", filename);
+		fprintf (stderr, "Could not open %s: %s\n", filename,
+			 strerror (errno));
 		return NULL;
 	}
 	root = open_ctree_fd(fp, filename, sb_bytenr, writes);
-- 
1.6.0.6

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