[PATCH 3/3] btrfs-progs: fix hole error output in fsck

[Josef Bacik <josef@toxicpanda.com>]

If we don't find holes in our hole rb tree we'll just assume there's a
gap from 0 to the length of the file and print that out.  But this
simply isn't correct, we could have a gap between the last extent and
the isize, or 0 and the start of the first extent.  Fix the error
message to tell us exactly where the hole is.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 check/main.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/check/main.c b/check/main.c
index 22f4e24c..71b68ff9 100644
--- a/check/main.c
+++ b/check/main.c
@@ -639,10 +639,20 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
 				hole->start, hole->len);
 			node = rb_next(node);
 		}
-		if (!found)
-			fprintf(stderr, "\tstart: 0, len: %llu\n",
-				round_up(rec->isize,
-					 root->fs_info->sectorsize));
+		if (!found) {
+			u64 start, len;
+			if (rec->extent_end < rec->isize) {
+				start = rec->extent_end;
+				len = round_up(rec->isize,
+					       root->fs_info->sectorsize) -
+					start;
+			} else {
+				start = 0;
+				len = rec->extent_start;
+			}
+			fprintf(stderr, "\tstart: %llu, len: %llu\n", start,
+				len);
+		}
 	}
 
 	/* Print dir item with mismatch hash */
-- 
2.24.1