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tools lib api fs: Move debugfs__strerror_open into tracing_path.c object

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Moving debugfs__strerror_open out of api/fs/debugfs.c, because it's not
debugfs specific. It'll be changed to consider tracefs mount as well in
following patches.

Renaming it into tracing_path__strerror_open_tp to fit into the
namespace. No functional change is intended.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Matt Fleming <matt.fleming@intel.com>
Cc: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1441180605-24737-6-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa
2015-09-02 09:56:35 +02:00
committed by Arnaldo Carvalho de Melo
parent 592d5a6ba8
commit 988bdb3192
4 changed files with 60 additions and 54 deletions
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54
tools/lib/api/fs/tracing_path.c
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@@ -5,6 +5,8 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "debugfs.h"
#include "tracefs.h"
@@ -81,3 +83,55 @@ void put_tracing_file(char *file)
{
free(file);
}
static int strerror_open(int err, char *buf, size_t size, const char *filename)
{
char sbuf[128];
switch (err) {
case ENOENT:
if (debugfs_configured()) {
snprintf(buf, size,
"Error:\tFile %s/%s not found.\n"
"Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
debugfs_mountpoint, filename);
break;
}
snprintf(buf, size, "%s",
"Error:\tUnable to find debugfs\n"
"Hint:\tWas your kernel compiled with debugfs support?\n"
"Hint:\tIs the debugfs filesystem mounted?\n"
"Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
break;
case EACCES: {
const char *mountpoint = debugfs_mountpoint;
if (!access(debugfs_mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
const char *tracefs_mntpoint = tracefs_find_mountpoint();
if (tracefs_mntpoint)
mountpoint = tracefs_mntpoint;
}
snprintf(buf, size,
"Error:\tNo permissions to read %s/%s\n"
"Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
debugfs_mountpoint, filename, mountpoint);
}
break;
default:
snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
break;
}
return 0;
}
int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name)
{
char path[PATH_MAX];
snprintf(path, PATH_MAX, "tracing/events/%s/%s", sys, name ?: "*");
return strerror_open(err, buf, size, path);
}