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trace: Generalize searching for debugfs

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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>
This commit is contained in:
Namhyung Kim 2017-11-08 00:31:35 +09:00 • committed by Stefan Hajnoczi
parent 5070570c90
commit babfff8e11
1 changed files with 7 additions and 7 deletions
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14
trace/ftrace.c
View file

@ -15,7 +15,7 @@
int trace_marker_fd; int trace_marker_fd;
static int find_debugfs(char *debugfs) static int find_mount(char *mount_point, const char *fstype)
{ {
char type[100]; char type[100];
FILE *fp; FILE *fp;
@ -27,8 +27,8 @@ static int find_debugfs(char *debugfs)
} }
while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n", while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
debugfs, type) == 2) { mount_point, type) == 2) {
if (strcmp(type, "debugfs") == 0) { if (strcmp(type, fstype) == 0) {
ret = 1; ret = 1;
break; break;
} }
@ -40,14 +40,14 @@ static int find_debugfs(char *debugfs)
bool ftrace_init(void) bool ftrace_init(void)
{ {
char debugfs[PATH_MAX]; char mount_point[PATH_MAX];
char path[PATH_MAX]; char path[PATH_MAX];
int debugfs_found; int debugfs_found;
int trace_fd = -1; int trace_fd = -1;
debugfs_found = find_debugfs(debugfs); debugfs_found = find_mount(mount_point, "debugfs");
if (debugfs_found) { if (debugfs_found) {
snprintf(path, PATH_MAX, "%s/tracing/tracing_on", debugfs); snprintf(path, PATH_MAX, "%s/tracing/tracing_on", mount_point);
trace_fd = open(path, O_WRONLY); trace_fd = open(path, O_WRONLY);
if (trace_fd < 0) { if (trace_fd < 0) {
if (errno == EACCES) { if (errno == EACCES) {
@ -66,7 +66,7 @@ bool ftrace_init(void)
} }
close(trace_fd); close(trace_fd);
} }
snprintf(path, PATH_MAX, "%s/tracing/trace_marker", debugfs); snprintf(path, PATH_MAX, "%s/tracing/trace_marker", mount_point);
trace_marker_fd = open(path, O_WRONLY); trace_marker_fd = open(path, O_WRONLY);
if (trace_marker_fd < 0) { if (trace_marker_fd < 0) {
perror("Could not open ftrace 'trace_marker' file"); perror("Could not open ftrace 'trace_marker' file");