Create the traverse_list_subvol_rec() function. Its aim is to permit
to process recursively the filesystems subvolumes.
Signed-off-by: Goffredo Baroncelli <kreijack@xxxxxxxxx>
---
btrfs-list.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
btrfs-list.h | 3 ++
2 files changed, 124 insertions(+)
diff --git a/btrfs-list.c b/btrfs-list.c
index 66f3127..b45c4d9 100644
--- a/btrfs-list.c
+++ b/btrfs-list.c
@@ -2012,3 +2012,124 @@ void free_root_info(struct root_info *ri)
free(ri->name);
free(ri->full_path);
}
+
+
+/*
+ * List and sort all subvolumes
+ */
+static int btrfs_list_all_subvols(int fd, struct root_lookup *root_sort,
+ struct root_lookup *root_lookup, int ascending)
+{
+ int ret = 0;
+ u64 top_id = 0;
+ struct btrfs_list_filter_set *filter_set;
+ struct btrfs_list_comparer_set *comp_set;
+
+ filter_set = btrfs_list_alloc_filter_set();
+ comp_set = btrfs_list_alloc_comparer_set();
+
+ btrfs_list_setup_filter(&filter_set,
+ BTRFS_LIST_FILTER_FULL_PATH,
+ top_id);
+ btrfs_list_setup_comparer(&comp_set, BTRFS_LIST_COMP_PATH, ascending);
+
+ ret = btrfs_list_subvols(fd, root_lookup);
+ if (ret)
+ goto exit;
+ __filter_and_sort_subvol(root_lookup, root_sort, filter_set,
+ comp_set, top_id);
+
+ ret = 0;
+exit:
+ if (filter_set)
+ btrfs_list_free_filter_set(filter_set);
+ if (comp_set)
+ btrfs_list_free_comparer_set(comp_set);
+
+ return ret;
+}
+
+/*
+ * traverse the subvolumes list, calling func() for each subvolume path
+ * data is passed to func(). If all == true, func is called on all
+ * filesystem subvolumes. ascending set the order criteria
+ */
+int traverse_list_subvol_rec(char *path, int all, int ascending,
+ int (*func)(char *real_root, char *relative_root, char *path, void *data),
+ void *data)
+{
+ struct root_lookup root_lookup = {{0}}, root_to_free = {{0}};
+ int ret, l=0, fd=-1;
+ DIR *fddir;
+ struct rb_node *n;
+ struct root_info ri = {{0}};
+ char *rootpath = NULL;
+
+ ret = 1; /* failure */
+
+ if (!all) {
+ /* search the full_path of path */
+ ret = get_root_info(path, &ri);
+ if (ret) {
+ fprintf(stderr, "ERROR: cannot get info on '%s'\n", path);
+ goto out;
+ }
+ }
+
+ fd = open_file_or_dir(path, &fddir);
+ if (fd < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", path);
+ goto out;
+ }
+ ret = btrfs_list_all_subvols(fd, &root_lookup, &root_to_free, ascending);
+ /* doesn't leak fd & fddir */
+ close_file_or_dir(fd, fddir);
+
+ if (ret) {
+ fprintf(stderr, "ERROR: cannot list the subvols\n");
+ goto out;
+ }
+
+ if (!all) {
+ n = rb_first(&root_lookup.root);
+ while (n) {
+ struct root_info *entry;
+
+ entry = rb_entry(n, struct root_info, sort_node);
+ if (entry->root_id == ri.root_id) {
+ rootpath = entry->full_path;
+ break;
+ }
+ n = rb_next(n);
+ }
+ BUG_ON(!rootpath);
+
+ } else {
+ rootpath = "<FS_TREE>";
+ }
+ l = strlen(rootpath);
+
+ for (n = rb_first(&root_lookup.root) ; n ; n = rb_next(n)) {
+ struct root_info *entry;
+
+ entry = rb_entry(n, struct root_info, sort_node);
+ if (!all && strncmp(rootpath, entry->full_path,l)) {
+ continue;
+ }
+
+ ret = func(rootpath, path, entry->full_path+l, data);
+ if (ret)
+ goto out;
+
+ }
+ ret = 0;
+
+out:
+
+ __free_all_subvolumn(&root_to_free);
+ if (!all)
+ free_root_info(&ri);
+
+ return ret;
+
+}
diff --git a/btrfs-list.h b/btrfs-list.h
index db32805..5c246e1 100644
--- a/btrfs-list.h
+++ b/btrfs-list.h
@@ -168,5 +168,8 @@ int btrfs_list_get_path_rootid(int fd, u64 *treeid);
int btrfs_get_subvol(int fd, struct root_info *the_ri);
int get_root_info(char *path, struct root_info *get_ri);
void free_root_info(struct root_info *ri);
+int traverse_list_subvol_rec(char *path, int all, int ascending,
+ int (*func)(char *real_root, char *relative_root, char *path, void *data),
+ void *data);
#endif
--
1.8.4.3
--
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