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[v6,2/8] Btrfs: support printing UUID tree elements

Message ID 0688e321e9a09932deb12d6eeac61dd72fb1a1b0.1372250828.git.sbehrens@giantdisaster.de (mailing list archive)
State Superseded, archived
Headers show

Commit Message

Stefan Behrens June 26, 2013, 3:16 p.m. UTC 
This commit adds support to print UUID tree elements to print-tree.c.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
---
 fs/btrfs/print-tree.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
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Patch

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index dc0024f..a8a1e4d 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -155,6 +155,26 @@  static void print_extent_ref_v0(struct extent_buffer *eb, int slot)
 }
 #endif
 
+static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
+			    u32 item_size)
+{
+	if (!IS_ALIGNED(item_size, sizeof(u64))) {
+		pr_warn("btrfs: uuid item with illegal size %lu!\n",
+			(unsigned long)item_size);
+		return;
+	}
+	while (item_size) {
+		u64 subvol_id;
+
+		read_extent_buffer(l, &subvol_id, offset, sizeof(u64));
+		subvol_id = le64_to_cpu(subvol_id);
+		printk(KERN_INFO "\t\tsubvol_id %llu\n",
+		       (unsigned long long)subvol_id);
+		item_size -= sizeof(u64);
+		offset += sizeof(u64);
+	}
+}
+
 void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
 {
 	int i;
@@ -301,6 +321,11 @@  void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
 		case BTRFS_DEV_REPLACE_KEY:
 			printk(KERN_INFO "\t\tdev replace\n");
 			break;
+		case BTRFS_UUID_KEY_SUBVOL:
+		case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
+			print_uuid_item(l, btrfs_item_ptr_offset(l, i),
+					btrfs_item_size_nr(l, i));
+			break;
 		};
 	}
 }