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tools lib api fs: Make tracing_path_strerror_open message generic

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Making tracing_path__strerror_open_tp message generic by mentioning both
debugfs/tracefs words in error message plus the tracing_path instead of
debugfs_mountpoint.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1441180605-24737-7-git-send-email-jolsa@kernel.org
[ Add comment for the ENOENT case out of this patch discussion thread ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2015-09-02 09:56:36 +02:00 • committed by Arnaldo Carvalho de Melo
parent fd405cf6cf
commit 4f234f06d6
1 changed files with 16 additions and 10 deletions
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26
tools/lib/api/fs/tracing_path.c
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@ -90,33 +90,39 @@ static int strerror_open(int err, char *buf, size_t size, const char *filename)
switch (err) { switch (err) {
case ENOENT: case ENOENT:
if (debugfs_configured()) { /*
* We will get here if we can't find the tracepoint, but one of
* debugfs or tracefs is configured, which means you probably
* want some tracepoint which wasn't compiled in your kernel.
* - jirka
*/
if (debugfs_configured() || tracefs_configured()) {
snprintf(buf, size, snprintf(buf, size,
"Error:\tFile %s/%s not found.\n" "Error:\tFile %s/%s not found.\n"
"Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n", "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
debugfs_mountpoint, filename); tracing_events_path, filename);
break; break;
} }
snprintf(buf, size, "%s", snprintf(buf, size, "%s",
"Error:\tUnable to find debugfs\n" "Error:\tUnable to find debugfs/tracefs\n"
"Hint:\tWas your kernel compiled with debugfs support?\n" "Hint:\tWas your kernel compiled with debugfs/tracefs support?\n"
"Hint:\tIs the debugfs filesystem mounted?\n" "Hint:\tIs the debugfs/tracefs filesystem mounted?\n"
"Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'"); "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
break; break;
case EACCES: { case EACCES: {
const char *mountpoint = debugfs_mountpoint; const char *mountpoint = debugfs_find_mountpoint();
if (!access(debugfs_mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) { if (!access(mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
const char *tracefs_mntpoint = tracefs_find_mountpoint(); const char *tracefs_mntpoint = tracefs_find_mountpoint();
if (tracefs_mntpoint) if (tracefs_mntpoint)
mountpoint = tracefs_mntpoint; mountpoint = tracefs_find_mountpoint();
} }
snprintf(buf, size, snprintf(buf, size,
"Error:\tNo permissions to read %s/%s\n" "Error:\tNo permissions to read %s/%s\n"
"Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n", "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
debugfs_mountpoint, filename, mountpoint); tracing_events_path, filename, mountpoint);
} }
break; break;
default: default:
@ -131,7 +137,7 @@ int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *
{ {
char path[PATH_MAX]; char path[PATH_MAX];
snprintf(path, PATH_MAX, "tracing/events/%s/%s", sys, name ?: "*"); snprintf(path, PATH_MAX, "%s/%s", sys, name ?: "*");
return strerror_open(err, buf, size, path); return strerror_open(err, buf, size, path);
} }