[PATCH 5/8] Btrfs-progs: function to get root_info of a subvol
From: Anand jain <hidden>
Date: 2012-12-28 03:06:58
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Anand Jain <redacted> Signed-off-by: Anand Jain <redacted> --- btrfs-list.c | 37 +++++++++++++++++++++++++++++++++++++ btrfs-list.h | 1 + 2 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/btrfs-list.c b/btrfs-list.c
index 1851f3e..cb458f1 100644
--- a/btrfs-list.c
+++ b/btrfs-list.c@@ -1455,6 +1455,43 @@ int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set *filter_set, return 0; } +int btrfs_get_subvol(int fd, struct root_info *the_ri) +{ + int ret = -1; + struct root_lookup rl; + struct rb_node *rbn; + struct root_info *ri; + u64 top_id = btrfs_list_get_path_rootid(fd); + + if (btrfs_list_subvols(fd, &rl)) + return 13; + + rbn = rb_first(&rl.root); + while(rbn) { + ri = rb_entry(rbn, struct root_info, rb_node); + resolve_root(&rl, ri, top_id); + if (!comp_entry_with_path(the_ri, ri, 0)) { + memcpy(the_ri, ri, offsetof(struct root_info, path)); + if (ri->path) + the_ri->path = strdup(ri->path); + else + the_ri->path = NULL; + if (ri->name) + the_ri->name = strdup(ri->name); + else + the_ri->name = NULL; + if (ri->full_path) + the_ri->full_path = strdup(ri->full_path); + else + the_ri->name = NULL; + ret = 0; + } + rbn = rb_next(rbn); + } + __free_all_subvolumn(&rl); + return ret; +} + static int print_one_extent(int fd, struct btrfs_ioctl_search_header *sh, struct btrfs_file_extent_item *item, u64 found_gen, u64 *cache_dirid,
diff --git a/btrfs-list.h b/btrfs-list.h
index 3b7b680..580d4d1 100644
--- a/btrfs-list.h
+++ b/btrfs-list.h@@ -151,3 +151,4 @@ int btrfs_list_find_updated_files(int fd, u64 root_id, u64 oldest_gen); int btrfs_list_get_default_subvolume(int fd, u64 *default_id); char *btrfs_list_path_for_root(int fd, u64 root); u64 btrfs_list_get_path_rootid(int fd); +int btrfs_get_subvol(int fd, struct root_info *the_ri);
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1.7.1