94 lines
2.6 KiB
Diff
94 lines
2.6 KiB
Diff
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From 1e9e1d5c876a4c281b3b9e72f4cbaaef1e3a2fa5 Mon Sep 17 00:00:00 2001
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From: David Marcin <djmarcin@google.com>
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Date: Mon, 21 Nov 2011 20:51:15 -0600
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Subject: [PATCH 170/170] btrfs-progs: In find-root, dump bytenr for every
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slot.
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Signed-off-by: David Marcin <djmarcin@google.com>
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---
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btrfs-find-root.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 59 insertions(+), 1 deletion(-)
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diff --git a/btrfs-find-root.c b/btrfs-find-root.c
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index ffbdde1..00b10e7 100644
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--- a/btrfs-find-root.c
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+++ b/btrfs-find-root.c
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@@ -127,8 +127,63 @@ out:
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return NULL;
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}
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+static int dump_root_bytenr(struct btrfs_root *root, u64 bytenr, u64 gen)
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+{
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+ struct btrfs_root *tmp = malloc(sizeof(struct btrfs_root));
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+ struct btrfs_path *path;
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+ struct btrfs_key key;
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+ struct btrfs_root_item ri;
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+ struct extent_buffer *leaf;
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+ struct btrfs_disk_key disk_key;
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+ struct btrfs_key found_key;
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+ int slot;
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+ int ret;
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+
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+ if (!tmp)
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+ return -ENOMEM;
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+
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+ __setup_root(4096, 4096, 4096, 4096, tmp,
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+ root->fs_info, BTRFS_ROOT_TREE_OBJECTID);
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+
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+ tmp->node = read_tree_block(root, bytenr, 4096, gen);
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+
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+ key.objectid = 0;
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+ key.type = BTRFS_ROOT_ITEM_KEY;
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+ key.offset = -1;
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+
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+ path = btrfs_alloc_path();
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+
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+ /* Walk the slots of this root looking for BTRFS_ROOT_ITEM_KEYs. */
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+ ret = btrfs_search_slot(NULL, tmp, &key, path, 0, 0);
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+ BUG_ON(ret < 0);
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+ while (1) {
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+ leaf = path->nodes[0];
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+ slot = path->slots[0];
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+ if (slot >= btrfs_header_nritems(leaf)) {
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+ ret = btrfs_next_leaf(tmp, path);
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+ if (ret != 0)
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+ break;
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+ leaf = path->nodes[0];
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+ slot = path->slots[0];
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+ }
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+ btrfs_item_key(leaf, &disk_key, path->slots[0]);
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+ btrfs_disk_key_to_cpu(&found_key, &disk_key);
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+ if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
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+ unsigned long offset;
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+
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+ offset = btrfs_item_ptr_offset(leaf, slot);
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+ read_extent_buffer(leaf, &ri, offset, sizeof(ri));
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+ printf("Generation: %Lu Root bytenr: %Lu\n", gen, btrfs_root_bytenr(&ri));
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+ }
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+ path->slots[0]++;
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+ }
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+ btrfs_free_path(path);
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+ free_extent_buffer(leaf);
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+ return 0;
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+}
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+
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static int search_iobuf(struct btrfs_root *root, void *iobuf,
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- size_t iobuf_size, off_t offset)
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+ size_t iobuf_size, off_t offset)
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{
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u64 gen = search_generation;
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u64 objectid = search_objectid;
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@@ -160,6 +215,9 @@ static int search_iobuf(struct btrfs_root *root, void *iobuf,
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h_byte);
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goto next;
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}
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+ /* Found some kind of root and it's fairly valid. */
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+ if (dump_root_bytenr(root, h_byte, h_gen))
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+ break;
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if (h_gen != gen) {
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fprintf(stderr, "Well block %Lu seems great, "
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"but generation doesn't match, "
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--
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1.8.3.1
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