Re: [perf/core PATCH v5 2/4] perf buildid-cache: Add --purge FILE to remove all caches of FILE

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Thu, Feb 26, 2015 at 03:54:47PM +0900, Masami Hiramatsu escreveu:
> @@ -285,6 +308,7 @@ int cmd_buildid_cache(int argc, const char **argv,
>  	bool force = false;
>  	char const *add_name_list_str = NULL,
>  		   *remove_name_list_str = NULL,
> +		   *purge_name_list_str = NULL,
>  		   *missing_filename = NULL,
>  		   *update_name_list_str = NULL,
>  		   *kcore_filename = NULL;
> @@ -302,6 +326,8 @@ int cmd_buildid_cache(int argc, const char **argv,
>  		   "file", "kcore file to add"),
>  	OPT_STRING('r', "remove", &remove_name_list_str, "file list",
>  		    "file(s) to remove"),
> +	OPT_STRING('p', "purge", &purge_name_list_str, "path list",
> +		    "path(s) to remove (remove old caches too)"),
>  	OPT_STRING('M', "missing", &missing_filename, "file",
>  		   "to find missing build ids in the cache"),
>  	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
> @@ -368,6 +394,24 @@ int cmd_buildid_cache(int argc, const char **argv,
>  		}
>  	}
>  
> +	if (purge_name_list_str) {
> +		list = strlist__new(true, purge_name_list_str);
> +		if (list) {
> +			strlist__for_each(pos, list)
> +				if (build_id_cache__purge_path(pos->s)) {
> +					if (errno == ENOENT) {
> +						pr_debug("%s wasn't in the cache\n",
> +							 pos->s);
> +						continue;
> +					}
> +					pr_warning("Couldn't remove %s: %s\n",
> +						   pos->s, strerror_r(errno, sbuf, sizeof(sbuf)));
> +				}
> +
> +			strlist__delete(list);
> +		}

Here we need to at least warn the user that what he/she asked couldn't
be done, i.e. strlist__new() failed.

Seeing --remove, --purge and --update makes me think eventually we need
a OPT_STRLIST() :-) 

I'm going thru the other patches, the first got in already.

Thanks for implementing --purge!

- Arnaldo

> +	}
> +
>  	if (missing_filename)
>  		ret = build_id_cache__fprintf_missing(session, stdout);
>  
> diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
> index 0bc33be..dcaa964 100644
> --- a/tools/perf/util/build-id.c
> +++ b/tools/perf/util/build-id.c
> @@ -281,35 +281,85 @@ void disable_buildid_cache(void)
>  	no_buildid_cache = true;
>  }
>  
> +static char *build_id_cache__dirname_from_path(const char *name,
> +					       bool is_kallsyms, bool is_vdso)
> +{
> +	char *realname = (char *)name, *filename;
> +	bool slash = is_kallsyms || is_vdso;
> +
> +	if (!slash) {
> +		realname = realpath(name, NULL);
> +		if (!realname)
> +			return NULL;
> +	}
> +
> +	if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",
> +		     is_vdso ? DSO__NAME_VDSO : realname) < 0)
> +		filename = NULL;
> +
> +	if (!slash)
> +		free(realname);
> +
> +	return filename;
> +}
> +
> +struct strlist *build_id_cache__list_build_ids(const char *pathname)
> +{
> +	struct strlist *list;
> +	char *dirname;
> +	DIR *dir;
> +	struct dirent *d;
> +
> +	list = strlist__new(true, NULL);
> +	dirname = build_id_cache__dirname_from_path(pathname, false, false);
> +	if (!list || !dirname)
> +		goto error_free;
> +
> +	/* List up all dirents */
> +	dir = opendir(dirname);
> +	if (!dir)
> +		goto error_free;
> +	while ((d = readdir(dir)) != NULL) {
> +		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
> +			continue;
> +		strlist__add(list, d->d_name);
> +	}
> +	closedir(dir);
> +
> +	free(dirname);
> +	return list;
> +
> +error_free:
> +	free(dirname);
> +	strlist__delete(list);
> +	return NULL;
> +}
> +
>  int build_id_cache__add_s(const char *sbuild_id, const char *name,
>  			  bool is_kallsyms, bool is_vdso)
>  {
>  	const size_t size = PATH_MAX;
> -	char *realname, *filename = zalloc(size),
> +	char *realname = NULL, *filename = NULL, *dirname = NULL,
>  	     *linkname = zalloc(size), *targetname, *tmp;
> -	int len, err = -1;
> -	bool slash = is_kallsyms || is_vdso;
> +	int err = -1;
>  
> -	if (is_kallsyms) {
> -		if (symbol_conf.kptr_restrict) {
> -			pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
> -			err = 0;
> -			goto out_free;
> -		}
> -		realname = (char *) name;
> -	} else
> +	if (!is_kallsyms) {
>  		realname = realpath(name, NULL);
> +		if (!realname)
> +			goto out_free;
> +	}
>  
> -	if (realname == NULL || filename == NULL || linkname == NULL)
> +	dirname = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);
> +	if (!dirname)
>  		goto out_free;
>  
> -	len = scnprintf(filename, size, "%s%s%s",
> -		       buildid_dir, slash ? "/" : "",
> -		       is_vdso ? DSO__NAME_VDSO : realname);
> -	if (mkdir_p(filename, 0755))
> +	if (mkdir_p(dirname, 0755))
>  		goto out_free;
>  
> -	snprintf(filename + len, size - len, "/%s", sbuild_id);
> +	if (asprintf(&filename, "%s/%s", dirname, sbuild_id) < 0) {
> +		filename = NULL;
> +		goto out_free;
> +	}
>  
>  	if (access(filename, F_OK)) {
>  		if (is_kallsyms) {
> @@ -337,6 +387,7 @@ out_free:
>  	if (!is_kallsyms)
>  		free(realname);
>  	free(filename);
> +	free(dirname);
>  	free(linkname);
>  	return err;
>  }
> diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
> index 2a09498..cbcadea 100644
> --- a/tools/perf/util/build-id.h
> +++ b/tools/perf/util/build-id.h
> @@ -22,6 +22,7 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits);
>  int perf_session__write_buildid_table(struct perf_session *session, int fd);
>  int perf_session__cache_build_ids(struct perf_session *session);
>  
> +struct strlist *build_id_cache__list_build_ids(const char *pathname);
>  bool build_id_cache__cached(const char *sbuild_id);
>  int build_id_cache__add_s(const char *sbuild_id,
>  			  const char *name, bool is_kallsyms, bool is_vdso);
>