perf trace: Split fd -> pathname array handling

So that the part that grows the array as needed is untied from the code
that reads the /proc/pid/fd symlink and can be used for the vfs_getname
hook that will set the fd -> path translation too, when available.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-ydo5rumyv9hdc1vsfmqamugs@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 27 insertions, 22 deletions

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d0f91fe755a3..763bef45afad 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -975,30 +975,9 @@ struct trace {
         double                  runtime_ms;
 };
 
-static int thread__read_fd_path(struct thread *thread, int fd)
+static int trace__set_fd_pathname(struct thread *thread, int fd, const char *pathname)
 {
         struct thread_trace *ttrace = thread->priv;
-        char linkname[PATH_MAX], pathname[PATH_MAX];
-        struct stat st;
-        int ret;
-
-        if (thread->pid_ == thread->tid) {
-                scnprintf(linkname, sizeof(linkname),
-                          "/proc/%d/fd/%d", thread->pid_, fd);
-        } else {
-                scnprintf(linkname, sizeof(linkname),
-                          "/proc/%d/task/%d/fd/%d", thread->pid_, thread->tid, fd);
-        }
-
-        if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
-                return -1;
-
-        ret = readlink(linkname, pathname, sizeof(pathname));
-
-        if (ret < 0 || ret > st.st_size)
-                return -1;
-
-        pathname[ret] = '\0';
 
         if (fd > ttrace->paths.max) {
                 char **npath = realloc(ttrace->paths.table, (fd + 1) * sizeof(char *));
@@ -1022,6 +1001,32 @@ static int thread__read_fd_path(struct thread *thread, int fd)
         return ttrace->paths.table[fd] != NULL ? 0 : -1;
 }
 
+static int thread__read_fd_path(struct thread *thread, int fd)
+{
+        char linkname[PATH_MAX], pathname[PATH_MAX];
+        struct stat st;
+        int ret;
+
+        if (thread->pid_ == thread->tid) {
+                scnprintf(linkname, sizeof(linkname),
+                          "/proc/%d/fd/%d", thread->pid_, fd);
+        } else {
+                scnprintf(linkname, sizeof(linkname),
+                          "/proc/%d/task/%d/fd/%d", thread->pid_, thread->tid, fd);
+        }
+
+        if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
+                return -1;
+
+        ret = readlink(linkname, pathname, sizeof(pathname));
+
+        if (ret < 0 || ret > st.st_size)
+                return -1;
+
+        pathname[ret] = '\0';
+        return trace__set_fd_pathname(thread, fd, pathname);
+}
+
 static const char *thread__fd_path(struct thread *thread, int fd, bool live)
 {
         struct thread_trace *ttrace = thread->priv;