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authorNamhyung Kim <namhyung@gmail.com>2017-11-08 00:31:35 +0900
committerStefan Hajnoczi <stefanha@redhat.com>2017-12-18 14:37:36 +0000
commitbabfff8e11589a2d1ab9ca777ebb16495f708616 (patch)
treee2b9daadefb12162270a9491c95f278d2f2d86a0 /trace
parent5070570c9089b905dd9efae30ee4318033c6ccd6 (diff)
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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>
Diffstat (limited to 'trace')
-rw-r--r--trace/ftrace.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/trace/ftrace.c b/trace/ftrace.c
index bfa38e7..213cb22 100644
--- a/trace/ftrace.c
+++ b/trace/ftrace.c
@@ -15,7 +15,7 @@
int trace_marker_fd;
-static int find_debugfs(char *debugfs)
+static int find_mount(char *mount_point, const char *fstype)
{
char type[100];
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",
- debugfs, type) == 2) {
- if (strcmp(type, "debugfs") == 0) {
+ mount_point, type) == 2) {
+ if (strcmp(type, fstype) == 0) {
ret = 1;
break;
}
@@ -40,14 +40,14 @@ static int find_debugfs(char *debugfs)
bool ftrace_init(void)
{
- char debugfs[PATH_MAX];
+ char mount_point[PATH_MAX];
char path[PATH_MAX];
int debugfs_found;
int trace_fd = -1;
- debugfs_found = find_debugfs(debugfs);
+ debugfs_found = find_mount(mount_point, "debugfs");
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);
if (trace_fd < 0) {
if (errno == EACCES) {
@@ -66,7 +66,7 @@ bool ftrace_init(void)
}
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);
if (trace_marker_fd < 0) {
perror("Could not open ftrace 'trace_marker' file");