mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 04:32:03 +00:00
a986241854
Adding procfs support into fs class. The interface function: const char *procfs__mountpoint(void); provides existing mountpoint path for procfs. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1383660887-1734-3-git-send-email-jolsa@redhat.com [ Fixup namespace ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
120 lines
2.0 KiB
C
120 lines
2.0 KiB
C
|
|
/* TODO merge/factor into tools/lib/lk/debugfs.c */
|
|
|
|
#include "util.h"
|
|
#include "util/fs.h"
|
|
|
|
static const char * const sysfs__fs_known_mountpoints[] = {
|
|
"/sys",
|
|
0,
|
|
};
|
|
|
|
static const char * const procfs__known_mountpoints[] = {
|
|
"/proc",
|
|
0,
|
|
};
|
|
|
|
struct fs {
|
|
const char *name;
|
|
const char * const *mounts;
|
|
char path[PATH_MAX + 1];
|
|
bool found;
|
|
long magic;
|
|
};
|
|
|
|
enum {
|
|
FS__SYSFS = 0,
|
|
FS__PROCFS = 1,
|
|
};
|
|
|
|
static struct fs fs__entries[] = {
|
|
[FS__SYSFS] = {
|
|
.name = "sysfs",
|
|
.mounts = sysfs__fs_known_mountpoints,
|
|
.magic = SYSFS_MAGIC,
|
|
},
|
|
[FS__PROCFS] = {
|
|
.name = "proc",
|
|
.mounts = procfs__known_mountpoints,
|
|
.magic = PROC_SUPER_MAGIC,
|
|
},
|
|
};
|
|
|
|
static bool fs__read_mounts(struct fs *fs)
|
|
{
|
|
bool found = false;
|
|
char type[100];
|
|
FILE *fp;
|
|
|
|
fp = fopen("/proc/mounts", "r");
|
|
if (fp == NULL)
|
|
return NULL;
|
|
|
|
while (!found &&
|
|
fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
|
|
fs->path, type) == 2) {
|
|
|
|
if (strcmp(type, fs->name) == 0)
|
|
found = true;
|
|
}
|
|
|
|
fclose(fp);
|
|
return fs->found = found;
|
|
}
|
|
|
|
static int fs__valid_mount(const char *fs, long magic)
|
|
{
|
|
struct statfs st_fs;
|
|
|
|
if (statfs(fs, &st_fs) < 0)
|
|
return -ENOENT;
|
|
else if (st_fs.f_type != magic)
|
|
return -ENOENT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool fs__check_mounts(struct fs *fs)
|
|
{
|
|
const char * const *ptr;
|
|
|
|
ptr = fs->mounts;
|
|
while (*ptr) {
|
|
if (fs__valid_mount(*ptr, fs->magic) == 0) {
|
|
fs->found = true;
|
|
strcpy(fs->path, *ptr);
|
|
return true;
|
|
}
|
|
ptr++;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static const char *fs__get_mountpoint(struct fs *fs)
|
|
{
|
|
if (fs__check_mounts(fs))
|
|
return fs->path;
|
|
|
|
return fs__read_mounts(fs) ? fs->path : NULL;
|
|
}
|
|
|
|
static const char *fs__mountpoint(int idx)
|
|
{
|
|
struct fs *fs = &fs__entries[idx];
|
|
|
|
if (fs->found)
|
|
return (const char *)fs->path;
|
|
|
|
return fs__get_mountpoint(fs);
|
|
}
|
|
|
|
#define FS__MOUNTPOINT(name, idx) \
|
|
const char *name##__mountpoint(void) \
|
|
{ \
|
|
return fs__mountpoint(idx); \
|
|
}
|
|
|
|
FS__MOUNTPOINT(sysfs, FS__SYSFS);
|
|
FS__MOUNTPOINT(procfs, FS__PROCFS);
|