/*
* util_stat_get_type -- checks whether stat structure describes
* device dax or a normal file
*/
enum file_type
util_stat_get_type(const os_stat_t *st)
{
#ifdef _WIN32
return TYPE_NORMAL;
#else
if (!S_ISCHR(st->st_mode)) {
LOG(4, "not a character device");
return TYPE_NORMAL;
}
char spath[PATH_MAX];
snprintf(spath, PATH_MAX, "/sys/dev/char/%u:%u/subsystem",
os_major(st->st_rdev), os_minor(st->st_rdev));
LOG(4, "device subsystem path \"%s\"", spath);
char npath[PATH_MAX];
char *rpath = realpath(spath, npath);
if (rpath == NULL) {
ERR("!realpath \"%s\"", spath);
return OTHER_ERROR;
}
char *basename = strrchr(rpath, '/');
if (!basename || strcmp("dax", basename + 1) != 0) {
LOG(3, "%s path does not match device dax prefix path", rpath);
errno = EINVAL;
return OTHER_ERROR;
}
return TYPE_DEVDAX;
#endif
}
/*
* device_dax_size -- (internal) checks the size of a given dax device
*/
static ssize_t
device_dax_size(const char *path)
{
LOG(3, "path \"%s\"", path);
os_stat_t st;
int olderrno;
if (os_stat(path, &st) < 0) {
ERR("!stat \"%s\"", path);
return -1;
}
char spath[PATH_MAX];
snprintf(spath, PATH_MAX, "/sys/dev/char/%u:%u/size",
os_major(st.st_rdev), os_minor(st.st_rdev));
LOG(4, "device size path \"%s\"", spath);
int fd = os_open(spath, O_RDONLY);
if (fd < 0) {
ERR("!open \"%s\"", spath);
return -1;
}
ssize_t size = -1;
char sizebuf[MAX_SIZE_LENGTH + 1];
ssize_t nread;
if ((nread = read(fd, sizebuf, MAX_SIZE_LENGTH)) < 0) {
ERR("!read");
goto out;
}
sizebuf[nread] = 0; /* null termination */
char *endptr;
olderrno = errno;
errno = 0;
size = strtoll(sizebuf, &endptr, 0);
if (endptr == sizebuf || *endptr != '\n' ||
((size == LLONG_MAX || size == LLONG_MIN) && errno == ERANGE)) {
ERR("invalid device size %s", sizebuf);
size = -1;
goto out;
}
errno = olderrno;
out:
olderrno = errno;
(void) os_close(fd);
errno = olderrno;
LOG(4, "device size %zu", size);
return size;
}
static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p)
{
p->ino = buf->st_ino;
p->mode = buf->st_mode;
p->nlink = buf->st_nlink;
p->uid = buf->st_uid;
p->gid = buf->st_gid;
p->size = buf->st_size;
p->atime.tv_sec = buf->st_atime;
p->atime.tv_nsec = 0;
p->ctime.tv_sec = buf->st_ctime;
p->ctime.tv_nsec = 0;
p->mtime.tv_sec = buf->st_mtime;
p->mtime.tv_nsec = 0;
p->blksize = buf->st_blksize;
p->blocks = buf->st_blocks;
p->maj = os_major(buf->st_rdev);
p->min = os_minor(buf->st_rdev);
}