2837609fef
Following debugfs object functions are not referenced within the code: int debugfs_valid_entry(const char *path); int debugfs_umount(void); int debugfs_write(const char *entry, const char *value); int debugfs_read(const char *entry, char *buffer, size_t size); void debugfs_force_cleanup(void); int debugfs_make_path(const char *element, char *buffer, int size); Removing them. Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1327674868-10486-3-git-send-email-jolsa@redhat.com Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
#include "util.h"
|
|
#include "debugfs.h"
|
|
#include "cache.h"
|
|
|
|
#include <linux/kernel.h>
|
|
#include <sys/mount.h>
|
|
|
|
static int debugfs_premounted;
|
|
char debugfs_mountpoint[PATH_MAX + 1] = "/sys/kernel/debug";
|
|
char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
|
|
|
|
static const char *debugfs_known_mountpoints[] = {
|
|
"/sys/kernel/debug/",
|
|
"/debug/",
|
|
0,
|
|
};
|
|
|
|
static int debugfs_found;
|
|
|
|
/* find the path to the mounted debugfs */
|
|
const char *debugfs_find_mountpoint(void)
|
|
{
|
|
const char **ptr;
|
|
char type[100];
|
|
FILE *fp;
|
|
|
|
if (debugfs_found)
|
|
return (const char *) debugfs_mountpoint;
|
|
|
|
ptr = debugfs_known_mountpoints;
|
|
while (*ptr) {
|
|
if (debugfs_valid_mountpoint(*ptr) == 0) {
|
|
debugfs_found = 1;
|
|
strcpy(debugfs_mountpoint, *ptr);
|
|
return debugfs_mountpoint;
|
|
}
|
|
ptr++;
|
|
}
|
|
|
|
/* give up and parse /proc/mounts */
|
|
fp = fopen("/proc/mounts", "r");
|
|
if (fp == NULL)
|
|
return NULL;
|
|
|
|
while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
|
|
debugfs_mountpoint, type) == 2) {
|
|
if (strcmp(type, "debugfs") == 0)
|
|
break;
|
|
}
|
|
fclose(fp);
|
|
|
|
if (strcmp(type, "debugfs") != 0)
|
|
return NULL;
|
|
|
|
debugfs_found = 1;
|
|
|
|
return debugfs_mountpoint;
|
|
}
|
|
|
|
/* verify that a mountpoint is actually a debugfs instance */
|
|
|
|
int debugfs_valid_mountpoint(const char *debugfs)
|
|
{
|
|
struct statfs st_fs;
|
|
|
|
if (statfs(debugfs, &st_fs) < 0)
|
|
return -ENOENT;
|
|
else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
|
|
return -ENOENT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void debugfs_set_tracing_events_path(const char *mountpoint)
|
|
{
|
|
snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s",
|
|
mountpoint, "tracing/events");
|
|
}
|
|
|
|
/* mount the debugfs somewhere if it's not mounted */
|
|
|
|
char *debugfs_mount(const char *mountpoint)
|
|
{
|
|
/* see if it's already mounted */
|
|
if (debugfs_find_mountpoint()) {
|
|
debugfs_premounted = 1;
|
|
goto out;
|
|
}
|
|
|
|
/* if not mounted and no argument */
|
|
if (mountpoint == NULL) {
|
|
/* see if environment variable set */
|
|
mountpoint = getenv(PERF_DEBUGFS_ENVIRONMENT);
|
|
/* if no environment variable, use default */
|
|
if (mountpoint == NULL)
|
|
mountpoint = "/sys/kernel/debug";
|
|
}
|
|
|
|
if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0)
|
|
return NULL;
|
|
|
|
/* save the mountpoint */
|
|
debugfs_found = 1;
|
|
strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
|
|
out:
|
|
debugfs_set_tracing_events_path(debugfs_mountpoint);
|
|
return debugfs_mountpoint;
|
|
}
|
|
|
|
void debugfs_set_path(const char *mountpoint)
|
|
{
|
|
snprintf(debugfs_mountpoint, sizeof(debugfs_mountpoint), "%s", mountpoint);
|
|
debugfs_set_tracing_events_path(mountpoint);
|
|
}
|