[PATCH] Btrfs-progs: add options to change size in logical to inode transition

[Liu Bo <bo.li.liu@oracle.com>]

Add an option 's' to set size in logical to inode transition, then we are able
to read all the refs to the logical address.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 cmds-inspect.c |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/cmds-inspect.c b/cmds-inspect.c
index 2f0228f..be5e588 100644
--- a/cmds-inspect.c
+++ b/cmds-inspect.c
@@ -115,7 +115,7 @@ static int cmd_inode_resolve(int argc, char **argv)
 }
 
 static const char * const cmd_logical_resolve_usage[] = {
-	"btrfs inspect-internal logical-resolve [-Pv] <logical> <path>",
+	"btrfs inspect-internal logical-resolve [-Pv] [-s size] <logical> <path>",
 	"Get file system paths for the given logical address",
 	NULL
 };
@@ -130,12 +130,13 @@ static int cmd_logical_resolve(int argc, char **argv)
 	int bytes_left;
 	struct btrfs_ioctl_logical_ino_args loi;
 	struct btrfs_data_container *inodes;
+	u64 size = 4096;
 	char full_path[4096];
 	char *path_ptr;
 
 	optind = 1;
 	while (1) {
-		int c = getopt(argc, argv, "Pv");
+		int c = getopt(argc, argv, "Pvs:");
 		if (c < 0)
 			break;
 
@@ -146,6 +147,9 @@ static int cmd_logical_resolve(int argc, char **argv)
 		case 'v':
 			verbose = 1;
 			break;
+		case 's':
+			size = atoll(optarg);
+			break;
 		default:
 			usage(cmd_logical_resolve_usage);
 		}
@@ -154,12 +158,13 @@ static int cmd_logical_resolve(int argc, char **argv)
 	if (check_argc_exact(argc - optind, 2))
 		usage(cmd_logical_resolve_usage);
 
-	inodes = malloc(4096);
+	size = max(size, 4096);
+	inodes = malloc(size);
 	if (!inodes)
 		return 1;
 
 	loi.logical = atoll(argv[optind]);
-	loi.size = 4096;
+	loi.size = size;
 	loi.inodes = (u64)inodes;
 
 	fd = open_file_or_dir(argv[optind+1]);
@@ -176,8 +181,9 @@ static int cmd_logical_resolve(int argc, char **argv)
 	}
 
 	if (verbose)
-		printf("ioctl ret=%d, bytes_left=%lu, bytes_missing=%lu, "
-			"cnt=%d, missed=%d\n", ret,
+		printf("ioctl ret=%d, total_size=%llu, bytes_left=%lu, "
+			"bytes_missing=%lu, cnt=%d, missed=%d\n",
+			ret, size,
 			(unsigned long)inodes->bytes_left,
 			(unsigned long)inodes->bytes_missing,
 			inodes->elem_cnt, inodes->elem_missed);
-- 
1.7.7.6