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>
77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
#define _GNU_SOURCE
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#include <errno.h>
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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 <unistd.h>
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#include <stdbool.h>
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#include <sys/vfs.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <linux/kernel.h>
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#include "debugfs.h"
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#include "tracefs.h"
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#ifndef DEBUGFS_DEFAULT_PATH
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#define DEBUGFS_DEFAULT_PATH "/sys/kernel/debug"
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#endif
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char debugfs_mountpoint[PATH_MAX + 1] = DEBUGFS_DEFAULT_PATH;
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static const char * const debugfs_known_mountpoints[] = {
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DEBUGFS_DEFAULT_PATH,
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"/debug",
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0,
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};
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static bool debugfs_found;
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bool debugfs_configured(void)
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{
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return debugfs_find_mountpoint() != NULL;
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}
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/* find the path to the mounted debugfs */
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const char *debugfs_find_mountpoint(void)
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{
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const char *ret;
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if (debugfs_found)
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return (const char *)debugfs_mountpoint;
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ret = find_mountpoint("debugfs", (long) DEBUGFS_MAGIC,
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debugfs_mountpoint, PATH_MAX + 1,
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debugfs_known_mountpoints);
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if (ret)
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debugfs_found = true;
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return ret;
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}
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/* mount the debugfs somewhere if it's not mounted */
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char *debugfs_mount(const char *mountpoint)
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{
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/* see if it's already mounted */
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if (debugfs_find_mountpoint())
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goto out;
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/* if not mounted and no argument */
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if (mountpoint == NULL) {
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/* see if environment variable set */
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mountpoint = getenv(PERF_DEBUGFS_ENVIRONMENT);
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/* if no environment variable, use default */
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if (mountpoint == NULL)
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mountpoint = DEBUGFS_DEFAULT_PATH;
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}
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if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0)
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return NULL;
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/* save the mountpoint */
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debugfs_found = true;
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strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
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out:
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return debugfs_mountpoint;
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}
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