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[Qemu-devel] [PULL 2/4] trace: Generalize searching for debugfs
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PULL 2/4] trace: Generalize searching for debugfs |
Date: |
Mon, 18 Dec 2017 14:47:58 +0000 |
From: Namhyung Kim <address@hidden>
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 <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
trace/ftrace.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/trace/ftrace.c b/trace/ftrace.c
index bfa38e71f0..213cb2205f 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");
--
2.14.3