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@@ -5,8 +5,74 @@
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* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
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*/
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-#include "btrfs.h"
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#include <malloc.h>
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+#include "ctree.h"
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+#include "btrfs.h"
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+
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+/*
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+ * Resolve the path of ino inside subvolume @root into @path_ret.
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+ *
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+ * @path_ret must be at least PATH_MAX size.
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+ */
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+static int get_path_in_subvol(struct btrfs_root *root, u64 ino, char *path_ret)
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+{
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+ struct btrfs_path path;
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+ struct btrfs_key key;
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+ char *tmp;
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+ u64 cur = ino;
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+ int ret = 0;
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+
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+ tmp = malloc(PATH_MAX);
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+ if (!tmp)
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+ return -ENOMEM;
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+ tmp[0] = '\0';
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+
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+ btrfs_init_path(&path);
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+ while (cur != BTRFS_FIRST_FREE_OBJECTID) {
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+ struct btrfs_inode_ref *iref;
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+ int name_len;
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+
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+ btrfs_release_path(&path);
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+ key.objectid = cur;
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+ key.type = BTRFS_INODE_REF_KEY;
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+ key.offset = (u64)-1;
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+
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+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
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+ /* Impossible */
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+ if (ret == 0)
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+ ret = -EUCLEAN;
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+ if (ret < 0)
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+ goto out;
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+ ret = btrfs_previous_item(root, &path, cur,
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+ BTRFS_INODE_REF_KEY);
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+ if (ret > 0)
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+ ret = -ENOENT;
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+ if (ret < 0)
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+ goto out;
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+
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+ strncpy(tmp, path_ret, PATH_MAX);
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+ iref = btrfs_item_ptr(path.nodes[0], path.slots[0],
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+ struct btrfs_inode_ref);
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+ name_len = btrfs_inode_ref_name_len(path.nodes[0],
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+ iref);
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+ if (name_len > BTRFS_NAME_LEN) {
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+ ret = -ENAMETOOLONG;
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+ goto out;
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+ }
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+ read_extent_buffer(path.nodes[0], path_ret,
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+ (unsigned long)(iref + 1), name_len);
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+ path_ret[name_len] = '/';
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+ path_ret[name_len + 1] = '\0';
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+ strncat(path_ret, tmp, PATH_MAX);
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+
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+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
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+ cur = key.offset;
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+ }
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+out:
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+ btrfs_release_path(&path);
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+ free(tmp);
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+ return ret;
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+}
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static int get_subvol_name(u64 subvolid, char *name, int max_len)
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{
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