trace: Generalize searching for debugfs
The find_debugfs() can be shared to find a different filesystem like tracefs. So make it more general and rename to find_mount(). Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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@ -15,7 +15,7 @@
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int trace_marker_fd;
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int trace_marker_fd;
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static int find_debugfs(char *debugfs)
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static int find_mount(char *mount_point, const char *fstype)
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{
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{
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char type[100];
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char type[100];
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FILE *fp;
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FILE *fp;
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@ -27,8 +27,8 @@ static int find_debugfs(char *debugfs)
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}
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}
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while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
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while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
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debugfs, type) == 2) {
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mount_point, type) == 2) {
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if (strcmp(type, "debugfs") == 0) {
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if (strcmp(type, fstype) == 0) {
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ret = 1;
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ret = 1;
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break;
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break;
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}
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}
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@ -40,14 +40,14 @@ static int find_debugfs(char *debugfs)
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bool ftrace_init(void)
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bool ftrace_init(void)
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{
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{
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char debugfs[PATH_MAX];
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char mount_point[PATH_MAX];
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char path[PATH_MAX];
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char path[PATH_MAX];
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int debugfs_found;
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int debugfs_found;
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int trace_fd = -1;
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int trace_fd = -1;
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debugfs_found = find_debugfs(debugfs);
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debugfs_found = find_mount(mount_point, "debugfs");
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if (debugfs_found) {
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if (debugfs_found) {
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snprintf(path, PATH_MAX, "%s/tracing/tracing_on", debugfs);
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snprintf(path, PATH_MAX, "%s/tracing/tracing_on", mount_point);
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trace_fd = open(path, O_WRONLY);
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trace_fd = open(path, O_WRONLY);
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if (trace_fd < 0) {
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if (trace_fd < 0) {
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if (errno == EACCES) {
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if (errno == EACCES) {
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@ -66,7 +66,7 @@ bool ftrace_init(void)
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}
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}
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close(trace_fd);
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close(trace_fd);
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}
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}
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snprintf(path, PATH_MAX, "%s/tracing/trace_marker", debugfs);
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snprintf(path, PATH_MAX, "%s/tracing/trace_marker", mount_point);
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trace_marker_fd = open(path, O_WRONLY);
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trace_marker_fd = open(path, O_WRONLY);
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if (trace_marker_fd < 0) {
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if (trace_marker_fd < 0) {
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perror("Could not open ftrace 'trace_marker' file");
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perror("Could not open ftrace 'trace_marker' file");
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