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988bdb3192
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>
137 lines
2.8 KiB
C
137 lines
2.8 KiB
C
#ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "debugfs.h"
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#include "tracefs.h"
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#include "tracing_path.h"
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char tracing_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing";
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char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
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static void __tracing_path_set(const char *tracing, const char *mountpoint)
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{
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snprintf(tracing_path, sizeof(tracing_path), "%s/%s",
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mountpoint, tracing);
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snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s",
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mountpoint, tracing, "events");
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}
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static const char *tracing_path_tracefs_mount(void)
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{
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const char *mnt;
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mnt = tracefs_mount(NULL);
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if (!mnt)
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return NULL;
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__tracing_path_set("", mnt);
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return mnt;
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}
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static const char *tracing_path_debugfs_mount(void)
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{
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const char *mnt;
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mnt = debugfs_mount(NULL);
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if (!mnt)
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return NULL;
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__tracing_path_set("tracing/", mnt);
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return mnt;
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}
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const char *tracing_path_mount(void)
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{
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const char *mnt;
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mnt = tracing_path_tracefs_mount();
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if (mnt)
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return mnt;
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mnt = tracing_path_debugfs_mount();
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return mnt;
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}
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void tracing_path_set(const char *mntpt)
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{
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__tracing_path_set("tracing/", mntpt);
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}
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char *get_tracing_file(const char *name)
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{
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char *file;
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if (asprintf(&file, "%s/%s", tracing_path, name) < 0)
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return NULL;
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return file;
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}
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void put_tracing_file(char *file)
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{
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free(file);
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}
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static int strerror_open(int err, char *buf, size_t size, const char *filename)
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{
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char sbuf[128];
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switch (err) {
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case ENOENT:
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if (debugfs_configured()) {
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snprintf(buf, size,
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"Error:\tFile %s/%s not found.\n"
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"Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
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debugfs_mountpoint, filename);
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break;
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}
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snprintf(buf, size, "%s",
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"Error:\tUnable to find debugfs\n"
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"Hint:\tWas your kernel compiled with debugfs support?\n"
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"Hint:\tIs the debugfs filesystem mounted?\n"
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"Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
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break;
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case EACCES: {
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const char *mountpoint = debugfs_mountpoint;
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if (!access(debugfs_mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
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const char *tracefs_mntpoint = tracefs_find_mountpoint();
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if (tracefs_mntpoint)
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mountpoint = tracefs_mntpoint;
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}
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snprintf(buf, size,
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"Error:\tNo permissions to read %s/%s\n"
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"Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
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debugfs_mountpoint, filename, mountpoint);
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}
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break;
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default:
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snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
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break;
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}
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return 0;
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}
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int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name)
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{
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char path[PATH_MAX];
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snprintf(path, PATH_MAX, "tracing/events/%s/%s", sys, name ?: "*");
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return strerror_open(err, buf, size, path);
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}
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