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authorDavid Sterba <dsterba@suse.cz>2013-09-18 18:19:30 +0200
committerChris Mason <chris.mason@fusionio.com>2013-10-16 08:23:11 -0400
commit7fbcc39c3075b88718bcb3e8e6f3ff599a4e9f86 (patch)
tree50c7072f9a53f9270b0077206ad38ec5be14a2f4 /cmds-inspect.c
parent8e937074a4ecc1a70f4a10cfff94e60a916ce82f (diff)
btrfs-progs: look up the containing tree root id
Find the tree id of the containing subvolume for a given file or directory. For subvolume return it's own id. $ btrfs inspect-internal rootid <path> Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'cmds-inspect.c')
-rw-r--r--cmds-inspect.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/cmds-inspect.c b/cmds-inspect.c
index bdebf7d..f0c8e3d 100644
--- a/cmds-inspect.c
+++ b/cmds-inspect.c
@@ -301,6 +301,43 @@ out:
return ret ? 1 : 0;
}
+static const char* const cmd_rootid_usage[] = {
+ "btrfs inspect-internal rootid <path>",
+ "Get tree ID of the containing subvolume of path.",
+ NULL
+};
+
+static int cmd_rootid(int argc, char **argv)
+{
+ int ret;
+ int fd = -1;
+ u64 rootid;
+ DIR *dirstream = NULL;
+
+ if (check_argc_exact(argc, 2))
+ usage(cmd_rootid_usage);
+
+ fd = open_file_or_dir(argv[1], &dirstream);
+ if (fd < 0) {
+ fprintf(stderr, "ERROR: can't access '%s'\n", argv[1]);
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ret = lookup_ino_rootid(fd, &rootid);
+ if (ret) {
+ fprintf(stderr, "%s: rootid failed with ret=%d\n",
+ argv[0], ret);
+ goto out;
+ }
+
+ printf("%llu\n", (unsigned long long)rootid);
+out:
+ close_file_or_dir(fd, dirstream);
+
+ return !!ret;
+}
+
const struct cmd_group inspect_cmd_group = {
inspect_cmd_group_usage, NULL, {
{ "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
@@ -309,6 +346,7 @@ const struct cmd_group inspect_cmd_group = {
cmd_logical_resolve_usage, NULL, 0 },
{ "subvolid-resolve", cmd_subvolid_resolve,
cmd_subvolid_resolve_usage, NULL, 0 },
+ { "rootid", cmd_rootid, cmd_rootid_usage, NULL, 0 },
NULL_CMD_STRUCT
}
};