summaryrefslogtreecommitdiffstats
path: root/tools/lib/api/fs/fs.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/lib/api/fs/fs.c')
-rw-r--r--tools/lib/api/fs/fs.c44
1 files changed, 39 insertions, 5 deletions
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index ef16d2a83a27..bc93baf33fff 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -9,6 +9,7 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
+#include <sys/mount.h>
#include "debugfs.h"
#include "fs.h"
@@ -215,16 +216,49 @@ static const char *fs__mountpoint(int idx)
return fs__get_mountpoint(fs);
}
-#define FS__MOUNTPOINT(name, idx) \
+static const char *mount_overload(struct fs *fs)
+{
+ size_t name_len = strlen(fs->name);
+ /* "PERF_" + name + "_ENVIRONMENT" + '\0' */
+ char upper_name[5 + name_len + 12 + 1];
+
+ snprintf(upper_name, name_len, "PERF_%s_ENVIRONMENT", fs->name);
+ mem_toupper(upper_name, name_len);
+
+ return getenv(upper_name) ?: *fs->mounts;
+}
+
+static const char *fs__mount(int idx)
+{
+ struct fs *fs = &fs__entries[idx];
+ const char *mountpoint;
+
+ if (fs__mountpoint(idx))
+ return (const char *)fs->path;
+
+ mountpoint = mount_overload(fs);
+
+ if (mount(NULL, mountpoint, fs->name, 0, NULL) < 0)
+ return NULL;
+
+ return fs__check_mounts(fs) ? fs->path : NULL;
+}
+
+#define FS(name, idx) \
const char *name##__mountpoint(void) \
{ \
return fs__mountpoint(idx); \
+} \
+ \
+const char *name##__mount(void) \
+{ \
+ return fs__mount(idx); \
}
-FS__MOUNTPOINT(sysfs, FS__SYSFS);
-FS__MOUNTPOINT(procfs, FS__PROCFS);
-FS__MOUNTPOINT(debugfs, FS__DEBUGFS);
-FS__MOUNTPOINT(tracefs, FS__TRACEFS);
+FS(sysfs, FS__SYSFS);
+FS(procfs, FS__PROCFS);
+FS(debugfs, FS__DEBUGFS);
+FS(tracefs, FS__TRACEFS);
int filename__read_int(const char *filename, int *value)
{