[PATCH] btrfs-progs: print-tree: Add leaf flags and backref revision output

[Qu Wenruo]

Btrfs header has a u64 member flags, whose lowest 56 bits are for header
flags like WRITTEN and RELOC.
And its highest 8 bits are for backref revision.

Manually checking btrfs_header_flags() will be a pain, so add such leaf
flags and backref revision output for print-tree.

Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
 print-tree.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/print-tree.c b/print-tree.c
index 5af80e87..823b87c1 100644
--- a/print-tree.c
+++ b/print-tree.c
@@ -938,13 +938,35 @@ static void print_dev_stats(struct extent_buffer *eb,
        }
 }
 
+/* Caller must ensure sizeof(*ret) >= 14 "WRITTEN|RELOC" */
+static void header_flags_to_str(u64 flags, char *ret)
+{
+       int empty = 1;
+
+       if (flags & BTRFS_HEADER_FLAG_WRITTEN) {
+               empty = 0;
+               strcpy(ret, "WRITTEN");
+       }
+       if (flags & BTRFS_HEADER_FLAG_RELOC) {
+               if (!empty)
+                       strcat(ret, "|");
+               strcat(ret, "RELOC");
+       }
+}
+
 void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *eb)
 {
        struct btrfs_item *item;
        struct btrfs_disk_key disk_key;
+       char flags_str[128];
        u32 i;
        u32 nr;
+       u64 flags;
+       u8 backref_rev;
 
+       flags = btrfs_header_flags(eb) & ~BTRFS_BACKREF_REV_MASK;
+       backref_rev = btrfs_header_flags(eb) >> BTRFS_BACKREF_REV_SHIFT;
+       header_flags_to_str(flags, flags_str);
        nr = btrfs_header_nritems(eb);
 
        printf("leaf %llu items %d free space %d generation %llu owner %llu\n",
@@ -952,6 +974,8 @@ void btrfs_print_leaf(struct btrfs_root *root, struct 
extent_buffer *eb)
                btrfs_leaf_free_space(root, eb),
                (unsigned long long)btrfs_header_generation(eb),
                (unsigned long long)btrfs_header_owner(eb));
+       printf("leaf %llu flags 0x%llx(%s) backref revision %d\n",
+               btrfs_header_bytenr(eb), flags, flags_str, backref_rev);
        print_uuids(eb);
        fflush(stdout);
 
-- 
2.12.2



--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html