perf data: Support having perf.data stored as a directory

The caller needs to set 'struct perf_data::is_dir flag and the path will
be treated as a directory.

The 'struct perf_data::file' is initialized and open as 'path/header'
file.

Add a check to the direcory interface functions to check the is_dir flag.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20190308134745.5057-2-jolsa@kernel.org
[ Be consistent on how to signal failure, i.e. use -1 and let users check errno ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index e098e18..18fa8d4 100644 (file)
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -34,6 +34,9 @@ int perf_data__create_dir(struct perf_data *data, int nr)
        struct perf_data_file *files = NULL;
        int i, ret = -1;
 
+       if (WARN_ON(!data->is_dir))
+               return -EINVAL;
+
        files = zalloc(nr * sizeof(*files));
        if (!files)
                return -ENOMEM;
@@ -69,6 +72,9 @@ int perf_data__open_dir(struct perf_data *data)
        DIR *dir;
        int nr = 0;
 
+       if (WARN_ON(!data->is_dir))
+               return -EINVAL;
+
        dir = opendir(data->path);
        if (!dir)
                return -EINVAL;
@@ -173,6 +179,16 @@ static int check_backup(struct perf_data *data)
        return 0;
 }
 
+static bool is_dir(struct perf_data *data)
+{
+       struct stat st;
+
+       if (stat(data->path, &st))
+               return false;
+
+       return (st.st_mode & S_IFMT) == S_IFDIR;
+}
+
 static int open_file_read(struct perf_data *data)
 {
        struct stat st;
@@ -254,6 +270,30 @@ static int open_file_dup(struct perf_data *data)
        return open_file(data);
 }
 
+static int open_dir(struct perf_data *data)
+{
+       int ret;
+
+       /*
+        * So far we open only the header, so we can read the data version and
+        * layout.
+        */
+       if (asprintf(&data->file.path, "%s/header", data->path) < 0)
+               return -1;
+
+       if (perf_data__is_write(data) &&
+           mkdir(data->path, S_IRWXU) < 0)
+               return -1;
+
+       ret = open_file(data);
+
+       /* Cleanup whatever we managed to create so far. */
+       if (ret && perf_data__is_write(data))
+               rm_rf_perf_data(data->path);
+
+       return ret;
+}
+
 int perf_data__open(struct perf_data *data)
 {
        if (check_pipe(data))
@@ -265,11 +305,18 @@ int perf_data__open(struct perf_data *data)
        if (check_backup(data))
                return -1;
 
-       return open_file_dup(data);
+       if (perf_data__is_read(data))
+               data->is_dir = is_dir(data);
+
+       return perf_data__is_dir(data) ?
+              open_dir(data) : open_file_dup(data);
 }
 
 void perf_data__close(struct perf_data *data)
 {
+       if (perf_data__is_dir(data))
+               perf_data__close_dir(data);
+
        zfree(&data->file.path);
        close(data->file.fd);
 }

diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 14b47be..06aefed 100644 (file)
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -19,6 +19,7 @@ struct perf_data {
        const char              *path;
        struct perf_data_file    file;
        bool                     is_pipe;
+       bool                     is_dir;
        bool                     force;
        enum perf_data_mode      mode;
 
@@ -43,6 +44,11 @@ static inline int perf_data__is_pipe(struct perf_data *data)
        return data->is_pipe;
 }
 
+static inline bool perf_data__is_dir(struct perf_data *data)
+{
+       return data->is_dir;
+}
+
 static inline int perf_data__fd(struct perf_data *data)
 {
        return data->file.fd;

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index db643f3..de777bd 100644 (file)
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -152,6 +152,10 @@ struct perf_session *perf_session__new(struct perf_data *data,
                        }
 
                        perf_evlist__init_trace_event_sample_raw(session->evlist);
+
+                       /* Open the directory data. */
+                       if (data->is_dir && perf_data__open_dir(data))
+                               goto out_delete;
                }
        } else  {
                session->machines.host.env = &perf_env;