* Written by Karel Zak <kzak@redhat.com>
*/
#include <ctype.h>
+#include <libgen.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
#include "c.h"
-#include "at.h"
#include "pathnames.h"
#include "sysfs.h"
#include "fileutils.h"
#include "all-io.h"
+#include "debug.h"
-char *sysfs_devno_attribute_path(dev_t devno, char *buf,
- size_t bufsiz, const char *attr)
-{
- int len;
+static void sysfs_blkdev_deinit_path(struct path_cxt *pc);
+static int sysfs_blkdev_enoent_redirect(struct path_cxt *pc, const char *path, int *dirfd);
- if (attr)
- len = snprintf(buf, bufsiz, _PATH_SYS_DEVBLOCK "/%d:%d/%s",
- major(devno), minor(devno), attr);
- else
- len = snprintf(buf, bufsiz, _PATH_SYS_DEVBLOCK "/%d:%d",
- major(devno), minor(devno));
+/*
+ * Debug stuff (based on include/debug.h)
+ */
+static UL_DEBUG_DEFINE_MASK(ulsysfs);
+UL_DEBUG_DEFINE_MASKNAMES(ulsysfs) = UL_DEBUG_EMPTY_MASKNAMES;
- return (len < 0 || (size_t) len + 1 > bufsiz) ? NULL : buf;
-}
+#define ULSYSFS_DEBUG_INIT (1 << 1)
+#define ULSYSFS_DEBUG_CXT (1 << 2)
-int sysfs_devno_has_attribute(dev_t devno, const char *attr)
-{
- char path[PATH_MAX];
- struct stat info;
+#define DBG(m, x) __UL_DBG(ulsysfs, ULSYSFS_DEBUG_, m, x)
+#define ON_DBG(m, x) __UL_DBG_CALL(ulsysfs, ULSYSFS_DEBUG_, m, x)
- if (!sysfs_devno_attribute_path(devno, path, sizeof(path), attr))
- return 0;
- if (stat(path, &info) == 0)
- return 1;
- return 0;
-}
+#define UL_DEBUG_CURRENT_MASK UL_DEBUG_MASK(ulsysfs)
+#include "debugobj.h"
-char *sysfs_devno_path(dev_t devno, char *buf, size_t bufsiz)
+void ul_sysfs_init_debug(void)
{
- return sysfs_devno_attribute_path(devno, buf, bufsiz, NULL);
+ if (ulsysfs_debug_mask)
+ return;
+ __UL_INIT_DEBUG_FROM_ENV(ulsysfs, ULSYSFS_DEBUG_, 0, ULSYSFS_DEBUG);
}
-dev_t sysfs_devname_to_devno(const char *name, const char *parent)
+struct path_cxt *ul_new_sysfs_path(dev_t devno, struct path_cxt *parent, const char *prefix)
{
- char buf[PATH_MAX], *path = NULL;
- dev_t dev = 0;
-
- if (strncmp("/dev/", name, 5) == 0) {
- /*
- * Read from /dev
- */
- struct stat st;
-
- if (stat(name, &st) == 0)
- dev = st.st_rdev;
- else
- name += 5; /* unaccesible, or not node in /dev */
- }
+ struct path_cxt *pc = ul_new_path(NULL);
- if (!dev && parent && strncmp("dm-", name, 3)) {
- /*
- * Create path to /sys/block/<parent>/<name>/dev
- */
- int len = snprintf(buf, sizeof(buf),
- _PATH_SYS_BLOCK "/%s/%s/dev", parent, name);
- if (len < 0 || (size_t) len + 1 > sizeof(buf))
- return 0;
- path = buf;
+ if (!pc)
+ return NULL;
+ if (prefix)
+ ul_path_set_prefix(pc, prefix);
- } else if (!dev) {
- /*
- * Create path to /sys/block/<name>/dev
- */
- int len = snprintf(buf, sizeof(buf),
- _PATH_SYS_BLOCK "/%s/dev", name);
- if (len < 0 || (size_t) len + 1 > sizeof(buf))
- return 0;
- path = buf;
+ if (sysfs_blkdev_init_path(pc, devno, parent) != 0) {
+ ul_unref_path(pc);
+ return NULL;
}
- if (path) {
- /*
- * read devno from sysfs
- */
- FILE *f;
- int maj = 0, min = 0;
-
- f = fopen(path, "r" UL_CLOEXECSTR);
- if (!f)
- return 0;
-
- if (fscanf(f, "%d:%d", &maj, &min) == 2)
- dev = makedev(maj, min);
- fclose(f);
- }
- return dev;
+ DBG(CXT, ul_debugobj(pc, "alloc"));
+ return pc;
}
/*
- * Returns devname (e.g. "/dev/sda1") for the given devno.
+ * sysfs_blkdev_* is sysfs extension to ul_path_* API for block devices.
*
- * Note that the @buf has to be large enough to store /sys/dev/block/<maj:min>
- * symlinks.
+ * The function is possible to call in loop and without sysfs_blkdev_deinit_path().
+ * The sysfs_blkdev_deinit_path() is automatically called by ul_unref_path().
*
- * Please, use more robust blkid_devno_to_devname() in your applications.
*/
-char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz)
+int sysfs_blkdev_init_path(struct path_cxt *pc, dev_t devno, struct path_cxt *parent)
{
- struct sysfs_cxt cxt;
- char *name;
- size_t sz;
- struct stat st;
-
- if (sysfs_init(&cxt, devno, NULL))
- return NULL;
-
- name = sysfs_get_devname(&cxt, buf, bufsiz);
- sysfs_deinit(&cxt);
-
- if (!name)
- return NULL;
-
- sz = strlen(name);
+ struct sysfs_blkdev *blk;
+ int rc;
+ char buf[sizeof(_PATH_SYS_DEVBLOCK)
+ + sizeof(stringify_value(UINT32_MAX)) * 2
+ + 3];
+
+ /* define path to devno stuff */
+ snprintf(buf, sizeof(buf), _PATH_SYS_DEVBLOCK "/%d:%d", major(devno), minor(devno));
+ rc = ul_path_set_dir(pc, buf);
+ if (rc)
+ return rc;
+
+ /* make sure path exists */
+ rc = ul_path_get_dirfd(pc);
+ if (rc < 0)
+ return rc;
+
+ /* initialize sysfs blkdev specific stuff */
+ blk = ul_path_get_dialect(pc);
+ if (!blk) {
+ DBG(CXT, ul_debugobj(pc, "alloc new sysfs handler"));
+ blk = calloc(1, sizeof(struct sysfs_blkdev));
+ if (!blk)
+ return -ENOMEM;
- if (sz + sizeof("/dev/") > bufsiz)
- return NULL;
+ ul_path_set_dialect(pc, blk, sysfs_blkdev_deinit_path);
+ ul_path_set_enoent_redirect(pc, sysfs_blkdev_enoent_redirect);
+ }
- /* create the final "/dev/<name>" string */
- memmove(buf + 5, name, sz + 1);
- memcpy(buf, "/dev/", 5);
+ DBG(CXT, ul_debugobj(pc, "init sysfs stuff"));
- if (!stat(buf, &st) && S_ISBLK(st.st_mode) && st.st_rdev == devno)
- return buf;
+ blk->devno = devno;
+ sysfs_blkdev_set_parent(pc, parent);
- return NULL;
+ return 0;
}
-int sysfs_init(struct sysfs_cxt *cxt, dev_t devno, struct sysfs_cxt *parent)
+static void sysfs_blkdev_deinit_path(struct path_cxt *pc)
{
- char path[PATH_MAX];
- int fd, rc;
-
- memset(cxt, 0, sizeof(*cxt));
- cxt->dir_fd = -1;
+ struct sysfs_blkdev *blk;
- if (!sysfs_devno_path(devno, path, sizeof(path)))
- goto err;
-
- fd = open(path, O_RDONLY|O_CLOEXEC);
- if (fd < 0)
- goto err;
- cxt->dir_fd = fd;
+ if (!pc)
+ return;
- cxt->dir_path = strdup(path);
- if (!cxt->dir_path)
- goto err;
- cxt->devno = devno;
- cxt->parent = parent;
- return 0;
-err:
- rc = errno > 0 ? -errno : -1;
- sysfs_deinit(cxt);
- return rc;
-}
+ DBG(CXT, ul_debugobj(pc, "deinit"));
-void sysfs_deinit(struct sysfs_cxt *cxt)
-{
- if (!cxt)
+ blk = ul_path_get_dialect(pc);
+ if (!blk)
return;
- if (cxt->dir_fd >= 0)
- close(cxt->dir_fd);
- free(cxt->dir_path);
-
- memset(cxt, 0, sizeof(*cxt));
+ ul_ref_path(blk->parent);
+ free(blk);
- cxt->dir_fd = -1;
+ ul_path_set_dialect(pc, NULL, NULL);
}
-int sysfs_stat(struct sysfs_cxt *cxt, const char *attr, struct stat *st)
+int sysfs_blkdev_set_parent(struct path_cxt *pc, struct path_cxt *parent)
{
- int rc = fstat_at(cxt->dir_fd, cxt->dir_path, attr, st, 0);
+ struct sysfs_blkdev *blk = ul_path_get_dialect(pc);
- if (rc != 0 && errno == ENOENT &&
- strncmp(attr, "queue/", 6) == 0 && cxt->parent) {
+ if (!pc || !blk)
+ return -EINVAL;
- /* Exception for "queue/<attr>". These attributes are available
- * for parental devices only
- */
- return fstat_at(cxt->parent->dir_fd,
- cxt->parent->dir_path, attr, st, 0);
+ if (blk->parent) {
+ ul_unref_path(blk->parent);
+ blk->parent = NULL;
}
- return rc;
-}
-int sysfs_has_attribute(struct sysfs_cxt *cxt, const char *attr)
-{
- struct stat st;
+ if (parent) {
+ ul_ref_path(parent);
+ blk->parent = parent;
+ } else
+ blk->parent = NULL;
- return sysfs_stat(cxt, attr, &st) == 0;
+ DBG(CXT, ul_debugobj(pc, "new parent"));
+ return 0;
}
-static int sysfs_open(struct sysfs_cxt *cxt, const char *attr, int flags)
+struct path_cxt *sysfs_blkdev_get_parent(struct path_cxt *pc)
{
- int fd = open_at(cxt->dir_fd, cxt->dir_path, attr, flags);
-
- if (fd == -1 && errno == ENOENT &&
- strncmp(attr, "queue/", 6) == 0 && cxt->parent) {
-
- /* Exception for "queue/<attr>". These attributes are available
- * for parental devices only
- */
- fd = open_at(cxt->parent->dir_fd, cxt->dir_path, attr, flags);
- }
- return fd;
+ struct sysfs_blkdev *blk = ul_path_get_dialect(pc);
+ return blk ? blk->parent : NULL;
}
-ssize_t sysfs_readlink(struct sysfs_cxt *cxt, const char *attr,
- char *buf, size_t bufsiz)
+/*
+ * Redirects ENOENT errors to the parent, if the path is to the queue/
+ * sysfs directory. For example
+ *
+ * /sys/dev/block/8:1/queue/logical_block_size redirects to
+ * /sys/dev/block/8:0/queue/logical_block_size
+ */
+static int sysfs_blkdev_enoent_redirect(struct path_cxt *pc, const char *path, int *dirfd)
{
- if (!cxt->dir_path)
- return -1;
-
- if (attr)
- return readlink_at(cxt->dir_fd, cxt->dir_path, attr, buf, bufsiz);
+ struct sysfs_blkdev *blk = ul_path_get_dialect(pc);
- /* read /sys/dev/block/<maj:min> link */
- return readlink(cxt->dir_path, buf, bufsiz);
+ if (blk && blk->parent && strncmp(path, "queue/", 6) == 0) {
+ *dirfd = ul_path_get_dirfd(blk->parent);
+ if (*dirfd >= 0) {
+ DBG(CXT, ul_debugobj(pc, "%s redirected to parent", path));
+ return 0;
+ }
+ }
+ return 1; /* no redirect */
}
-DIR *sysfs_opendir(struct sysfs_cxt *cxt, const char *attr)
+char *sysfs_blkdev_get_name(struct path_cxt *pc, char *buf, size_t bufsiz)
{
- DIR *dir;
- int fd = -1;
-
- if (attr)
- fd = sysfs_open(cxt, attr, O_RDONLY|O_CLOEXEC);
-
- else if (cxt->dir_fd >= 0)
- /* request to open root of device in sysfs (/sys/block/<dev>)
- * -- we cannot use cxt->sysfs_fd directly, because closedir()
- * will close this our persistent file descriptor.
- */
- fd = fcntl(cxt->dir_fd, F_DUPFD_CLOEXEC, STDERR_FILENO + 1);
+ char link[PATH_MAX];
+ char *name;
+ ssize_t sz;
- if (fd < 0)
+ /* read /sys/dev/block/<maj:min> link */
+ sz = ul_path_readlink(pc, link, sizeof(link) - 1, NULL);
+ if (sz < 0)
return NULL;
+ link[sz] = '\0';
- dir = fdopendir(fd);
- if (!dir) {
- close(fd);
+ name = strrchr(link, '/');
+ if (!name)
return NULL;
- }
- if (!attr)
- rewinddir(dir);
- return dir;
-}
-
-static FILE *sysfs_fopen(struct sysfs_cxt *cxt, const char *attr)
-{
- int fd = sysfs_open(cxt, attr, O_RDONLY|O_CLOEXEC);
+ name++;
+ sz = strlen(name);
+ if ((size_t) sz + 1 > bufsiz)
+ return NULL;
- return fd < 0 ? NULL : fdopen(fd, "r" UL_CLOEXECSTR);
+ memcpy(buf, name, sz + 1);
+ sysfs_devname_sys_to_dev(buf);
+ return buf;
}
-
static struct dirent *xreaddir(DIR *dp)
{
struct dirent *d;
return d;
}
-int sysfs_is_partition_dirent(DIR *dir, struct dirent *d, const char *parent_name)
+int sysfs_blkdev_is_partition_dirent(DIR *dir, struct dirent *d, const char *parent_name)
{
- char path[256];
+ char path[NAME_MAX + 6 + 1];
#ifdef _DIRENT_HAVE_D_TYPE
if (d->d_type != DT_DIR &&
return faccessat(dirfd(dir), path, R_OK, 0) == 0;
}
+int sysfs_blkdev_count_partitions(struct path_cxt *pc, const char *devname)
+{
+ DIR *dir;
+ struct dirent *d;
+ int r = 0;
+
+ dir = ul_path_opendir(pc, NULL);
+ if (!dir)
+ return 0;
+
+ while ((d = xreaddir(dir))) {
+ if (sysfs_blkdev_is_partition_dirent(dir, d, devname))
+ r++;
+ }
+
+ closedir(dir);
+ return r;
+}
+
/*
* Converts @partno (partition number) to devno of the partition.
- * The @cxt handles wholedisk device.
+ * The @pc handles wholedisk device.
*
* Note that this code does not expect any special format of the
* partitions devnames.
*/
-dev_t sysfs_partno_to_devno(struct sysfs_cxt *cxt, int partno)
+dev_t sysfs_blkdev_partno_to_devno(struct path_cxt *pc, int partno)
{
DIR *dir;
struct dirent *d;
- char path[256];
dev_t devno = 0;
- dir = sysfs_opendir(cxt, NULL);
+ dir = ul_path_opendir(pc, NULL);
if (!dir)
return 0;
while ((d = xreaddir(dir))) {
- int n, maj, min;
+ int n;
- if (!sysfs_is_partition_dirent(dir, d, NULL))
+ if (!sysfs_blkdev_is_partition_dirent(dir, d, NULL))
continue;
- snprintf(path, sizeof(path), "%s/partition", d->d_name);
- if (sysfs_read_int(cxt, path, &n))
+ if (ul_path_readf_s32(pc, &n, "%s/partition", d->d_name))
continue;
if (n == partno) {
- snprintf(path, sizeof(path), "%s/dev", d->d_name);
- if (sysfs_scanf(cxt, path, "%d:%d", &maj, &min) == 2)
- devno = makedev(maj, min);
- break;
+ if (ul_path_readf_majmin(pc, &devno, "%s/dev", d->d_name) == 0)
+ break;
}
}
closedir(dir);
+ DBG(CXT, ul_debugobj(pc, "partno (%d) -> devno (%d)", (int) partno, (int) devno));
return devno;
}
-int sysfs_scanf(struct sysfs_cxt *cxt, const char *attr, const char *fmt, ...)
-{
- FILE *f = sysfs_fopen(cxt, attr);
- va_list ap;
- int rc;
-
- if (!f)
- return -EINVAL;
- va_start(ap, fmt);
- rc = vfscanf(f, fmt, ap);
- va_end(ap);
-
- fclose(f);
- return rc;
-}
-
-
-int sysfs_read_s64(struct sysfs_cxt *cxt, const char *attr, int64_t *res)
-{
- int64_t x = 0;
-
- if (sysfs_scanf(cxt, attr, "%"SCNd64, &x) == 1) {
- if (res)
- *res = x;
- return 0;
- }
- return -1;
-}
-
-int sysfs_read_u64(struct sysfs_cxt *cxt, const char *attr, uint64_t *res)
-{
- uint64_t x = 0;
-
- if (sysfs_scanf(cxt, attr, "%"SCNu64, &x) == 1) {
- if (res)
- *res = x;
- return 0;
- }
- return -1;
-}
-
-int sysfs_read_int(struct sysfs_cxt *cxt, const char *attr, int *res)
-{
- int x = 0;
-
- if (sysfs_scanf(cxt, attr, "%d", &x) == 1) {
- if (res)
- *res = x;
- return 0;
- }
- return -1;
-}
-
-int sysfs_write_string(struct sysfs_cxt *cxt, const char *attr, const char *str)
-{
- int fd = sysfs_open(cxt, attr, O_WRONLY|O_CLOEXEC);
- int rc, errsv;
-
- if (fd < 0)
- return -errno;
- rc = write_all(fd, str, strlen(str));
-
- errsv = errno;
- close(fd);
- errno = errsv;
- return rc;
-}
-
-int sysfs_write_u64(struct sysfs_cxt *cxt, const char *attr, uint64_t num)
-{
- char buf[sizeof(stringify_value(ULLONG_MAX))];
- int fd, rc = 0, len, errsv;
-
- fd = sysfs_open(cxt, attr, O_WRONLY|O_CLOEXEC);
- if (fd < 0)
- return -errno;
-
- len = snprintf(buf, sizeof(buf), "%ju", num);
- if (len < 0 || (size_t) len + 1 > sizeof(buf))
- rc = -errno;
- else
- rc = write_all(fd, buf, len);
-
- errsv = errno;
- close(fd);
- errno = errsv;
- return rc;
-}
-
-char *sysfs_strdup(struct sysfs_cxt *cxt, const char *attr)
-{
- char buf[1024];
- return sysfs_scanf(cxt, attr, "%1023[^\n]", buf) == 1 ?
- strdup(buf) : NULL;
-}
-
-int sysfs_count_dirents(struct sysfs_cxt *cxt, const char *attr)
-{
- DIR *dir;
- int r = 0;
-
- if (!(dir = sysfs_opendir(cxt, attr)))
- return 0;
-
- while (xreaddir(dir)) r++;
-
- closedir(dir);
- return r;
-}
-
-int sysfs_count_partitions(struct sysfs_cxt *cxt, const char *devname)
-{
- DIR *dir;
- struct dirent *d;
- int r = 0;
-
- if (!(dir = sysfs_opendir(cxt, NULL)))
- return 0;
-
- while ((d = xreaddir(dir))) {
- if (sysfs_is_partition_dirent(dir, d, devname))
- r++;
- }
-
- closedir(dir);
- return r;
-}
-
/*
* Returns slave name if there is only one slave, otherwise returns NULL.
* The result should be deallocated by free().
*/
-char *sysfs_get_slave(struct sysfs_cxt *cxt)
+char *sysfs_blkdev_get_slave(struct path_cxt *pc)
{
DIR *dir;
struct dirent *d;
char *name = NULL;
- if (!(dir = sysfs_opendir(cxt, "slaves")))
+ dir = ul_path_opendir(pc, "slaves");
+ if (!dir)
return NULL;
while ((d = xreaddir(dir))) {
if (name)
goto err; /* more slaves */
-
name = strdup(d->d_name);
}
return NULL;
}
-/*
- * Note that the @buf has to be large enough to store /sys/dev/block/<maj:min>
- * symlinks.
- */
-char *sysfs_get_devname(struct sysfs_cxt *cxt, char *buf, size_t bufsiz)
-{
- char *name = NULL;
- ssize_t sz;
-
- sz = sysfs_readlink(cxt, NULL, buf, bufsiz - 1);
- if (sz < 0)
- return NULL;
-
- buf[sz] = '\0';
- name = strrchr(buf, '/');
- if (!name)
- return NULL;
-
- name++;
- sz = strlen(name);
-
- memmove(buf, name, sz + 1);
- return buf;
-}
#define SUBSYSTEM_LINKNAME "/subsystem"
}
/*
- * Returns complete path to the device, the patch contains all all sybsystems
+ * Returns complete path to the device, the patch contains all subsystems
* used for the device.
*/
-char *sysfs_get_devchain(struct sysfs_cxt *cxt, char *buf, size_t bufsz)
+char *sysfs_blkdev_get_devchain(struct path_cxt *pc, char *buf, size_t bufsz)
{
/* read /sys/dev/block/<maj>:<min> symlink */
- ssize_t sz = sysfs_readlink(cxt, NULL, buf, bufsz);
+ ssize_t sz = ul_path_readlink(pc, buf, bufsz, NULL);
+ const char *prefix;
+ size_t psz = 0;
+
if (sz <= 0 || sz + sizeof(_PATH_SYS_DEVBLOCK "/") > bufsz)
return NULL;
buf[sz++] = '\0';
+ prefix = ul_path_get_prefix(pc);
+ if (prefix)
+ psz = strlen(prefix);
/* create absolute patch from the link */
- memmove(buf + sizeof(_PATH_SYS_DEVBLOCK "/") - 1, buf, sz);
- memcpy(buf, _PATH_SYS_DEVBLOCK "/", sizeof(_PATH_SYS_DEVBLOCK "/") - 1);
+ memmove(buf + psz + sizeof(_PATH_SYS_DEVBLOCK "/") - 1, buf, sz);
+ if (prefix)
+ memcpy(buf, prefix, psz);
+ memcpy(buf + psz, _PATH_SYS_DEVBLOCK "/", sizeof(_PATH_SYS_DEVBLOCK "/") - 1);
return buf;
}
*
* Returns: 0 in success, <0 on error, 1 on end of chain
*/
-int sysfs_next_subsystem(struct sysfs_cxt *cxt __attribute__((unused)),
+int sysfs_blkdev_next_subsystem(struct path_cxt *pc __attribute__((unused)),
char *devchain, char **subsys)
{
char subbuf[PATH_MAX];
if (!subsys || !devchain)
return -EINVAL;
+ *subsys = NULL;
+
while ((sub = get_subsystem(devchain, subbuf, sizeof(subbuf)))) {
*subsys = strdup(sub);
if (!*subsys)
return 0;
}
-int sysfs_is_hotpluggable(struct sysfs_cxt *cxt)
+int sysfs_blkdev_is_hotpluggable(struct path_cxt *pc)
{
char buf[PATH_MAX], *chain, *sub;
int rc = 0;
/* check /sys/dev/block/<maj>:<min>/removable attribute */
- if (sysfs_read_int(cxt, "removable", &rc) == 0 && rc == 1)
+ if (ul_path_read_s32(pc, &rc, "removable") == 0 && rc == 1)
return 1;
- chain = sysfs_get_devchain(cxt, buf, sizeof(buf));
+ chain = sysfs_blkdev_get_devchain(pc, buf, sizeof(buf));
- while (chain && sysfs_next_subsystem(cxt, chain, &sub) == 0) {
+ while (chain && sysfs_blkdev_next_subsystem(pc, chain, &sub) == 0) {
rc = is_hotpluggable_subsystem(sub);
if (rc) {
free(sub);
return rc;
}
-static int get_dm_wholedisk(struct sysfs_cxt *cxt, char *diskname,
+static int get_dm_wholedisk(struct path_cxt *pc, char *diskname,
size_t len, dev_t *diskdevno)
{
int rc = 0;
char *name;
- /* Note, sysfs_get_slave() returns the first slave only,
+ /* Note, sysfs_blkdev_get_slave() returns the first slave only,
* if there is more slaves, then return NULL
*/
- name = sysfs_get_slave(cxt);
+ name = sysfs_blkdev_get_slave(pc);
if (!name)
return -1;
}
if (diskdevno) {
- *diskdevno = sysfs_devname_to_devno(name, NULL);
+ *diskdevno = __sysfs_devname_to_devno(ul_path_get_prefix(pc), name, NULL);
if (!*diskdevno)
rc = -1;
}
}
/*
- * Returns by @diskdevno whole disk device devno and (optionaly) by
+ * Returns by @diskdevno whole disk device devno and (optionally) by
* @diskname the whole disk device name.
*/
-int sysfs_devno_to_wholedisk(dev_t dev, char *diskname,
- size_t len, dev_t *diskdevno)
+int sysfs_blkdev_get_wholedisk( struct path_cxt *pc,
+ char *diskname,
+ size_t len,
+ dev_t *diskdevno)
{
- struct sysfs_cxt cxt;
int is_part = 0;
- if (!dev || sysfs_init(&cxt, dev, NULL) != 0)
+ if (!pc)
return -1;
- is_part = sysfs_has_attribute(&cxt, "partition");
+ is_part = ul_path_access(pc, F_OK, "partition") == 0;
if (!is_part) {
/*
* Extra case for partitions mapped by device-mapper.
*
- * All regualar partitions (added by BLKPG ioctl or kernel PT
+ * All regular partitions (added by BLKPG ioctl or kernel PT
* parser) have the /sys/.../partition file. The partitions
* mapped by DM don't have such file, but they have "part"
* prefix in DM UUID.
*/
- char *uuid = sysfs_strdup(&cxt, "dm/uuid");
- char *tmp = uuid;
- char *prefix = uuid ? strsep(&tmp, "-") : NULL;
+ char *uuid = NULL, *tmp, *prefix;
+
+ ul_path_read_string(pc, &uuid, "dm/uuid");
+ tmp = uuid;
+ prefix = uuid ? strsep(&tmp, "-") : NULL;
if (prefix && strncasecmp(prefix, "part", 4) == 0)
is_part = 1;
free(uuid);
if (is_part &&
- get_dm_wholedisk(&cxt, diskname, len, diskdevno) == 0)
+ get_dm_wholedisk(pc, diskname, len, diskdevno) == 0)
/*
* partitioned device, mapped by DM
*/
/*
* unpartitioned device
*/
- if (diskname && len) {
- if (!sysfs_get_devname(&cxt, diskname, len))
- goto err;
- }
+ if (diskname && !sysfs_blkdev_get_name(pc, diskname, len))
+ goto err;
if (diskdevno)
- *diskdevno = dev;
+ *diskdevno = sysfs_blkdev_get_devno(pc);
} else {
/*
char *name;
ssize_t linklen;
- linklen = sysfs_readlink(&cxt, NULL, linkpath, sizeof(linkpath) - 1);
+ linklen = ul_path_readlink(pc, linkpath, sizeof(linkpath) - 1, NULL);
if (linklen < 0)
goto err;
linkpath[linklen] = '\0';
if (!name)
goto err;
+ sysfs_devname_sys_to_dev(name);
if (diskname && len) {
strncpy(diskname, name, len);
diskname[len - 1] = '\0';
}
if (diskdevno) {
- *diskdevno = sysfs_devname_to_devno(name, NULL);
+ *diskdevno = __sysfs_devname_to_devno(ul_path_get_prefix(pc), name, NULL);
if (!*diskdevno)
goto err;
}
}
done:
- sysfs_deinit(&cxt);
return 0;
err:
- sysfs_deinit(&cxt);
return -1;
}
+int sysfs_devno_to_wholedisk(dev_t devno, char *diskname,
+ size_t len, dev_t *diskdevno)
+{
+ struct path_cxt *pc;
+ int rc = 0;
+
+ if (!devno)
+ return -EINVAL;
+ pc = ul_new_sysfs_path(devno, NULL, NULL);
+ if (!pc)
+ return -ENOMEM;
+
+ rc = sysfs_blkdev_get_wholedisk(pc, diskname, len, diskdevno);
+ ul_unref_path(pc);
+ return rc;
+}
+
/*
- * Returns 1 if the device is private LVM device.
+ * Returns 1 if the device is private device mapper device. The @uuid
+ * (if not NULL) returns DM device UUID, use free() to deallocate.
*/
-int sysfs_devno_is_lvm_private(dev_t devno)
+int sysfs_devno_is_dm_private(dev_t devno, char **uuid)
{
- struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
- char *uuid = NULL;
+ struct path_cxt *pc = NULL;
+ char *id = NULL;
int rc = 0;
- if (sysfs_init(&cxt, devno, NULL) != 0)
- return 0;
-
- uuid = sysfs_strdup(&cxt, "dm/uuid");
+ pc = ul_new_sysfs_path(devno, NULL, NULL);
+ if (!pc)
+ goto done;
+ if (ul_path_read_string(pc, &id, "dm/uuid") <= 0 || !id)
+ goto done;
/* Private LVM devices use "LVM-<uuid>-<name>" uuid format (important
* is the "LVM" prefix and "-<name>" postfix).
*/
- if (uuid && strncmp(uuid, "LVM-", 4) == 0) {
- char *p = strrchr(uuid + 4, '-');
+ if (strncmp(id, "LVM-", 4) == 0) {
+ char *p = strrchr(id + 4, '-');
if (p && *(p + 1))
rc = 1;
- }
- sysfs_deinit(&cxt);
- free(uuid);
+ /* Private Stratis devices prefix the UUID with "stratis-1-private"
+ */
+ } else if (strncmp(id, "stratis-1-private", 17) == 0) {
+ rc = 1;
+ }
+done:
+ ul_unref_path(pc);
+ if (uuid)
+ *uuid = id;
+ else
+ free(id);
return rc;
}
}
-int sysfs_scsi_get_hctl(struct sysfs_cxt *cxt, int *h, int *c, int *t, int *l)
+int sysfs_blkdev_scsi_get_hctl(struct path_cxt *pc, int *h, int *c, int *t, int *l)
{
char buf[PATH_MAX], *hctl;
+ struct sysfs_blkdev *blk;
ssize_t len;
- if (!cxt)
+ blk = ul_path_get_dialect(pc);
+
+ if (!blk || blk->hctl_error)
return -EINVAL;
- if (cxt->has_hctl)
+ if (blk->has_hctl)
goto done;
- len = sysfs_readlink(cxt, "device", buf, sizeof(buf) - 1);
+ blk->hctl_error = 1;
+ len = ul_path_readlink(pc, buf, sizeof(buf) - 1, "device");
if (len < 0)
return len;
return -1;
hctl++;
- if (sscanf(hctl, "%u:%u:%u:%u", &cxt->scsi_host, &cxt->scsi_channel,
- &cxt->scsi_target, &cxt->scsi_lun) != 4)
+ if (sscanf(hctl, "%u:%u:%u:%u", &blk->scsi_host, &blk->scsi_channel,
+ &blk->scsi_target, &blk->scsi_lun) != 4)
return -1;
- cxt->has_hctl = 1;
+ blk->has_hctl = 1;
done:
if (h)
- *h = cxt->scsi_host;
+ *h = blk->scsi_host;
if (c)
- *c = cxt->scsi_channel;
+ *c = blk->scsi_channel;
if (t)
- *t = cxt->scsi_target;
+ *t = blk->scsi_target;
if (l)
- *l = cxt->scsi_lun;
+ *l = blk->scsi_lun;
+
+ blk->hctl_error = 0;
return 0;
}
-static char *sysfs_scsi_host_attribute_path(struct sysfs_cxt *cxt,
- const char *type, char *buf, size_t bufsz, const char *attr)
+static char *scsi_host_attribute_path(
+ struct path_cxt *pc,
+ const char *type,
+ char *buf,
+ size_t bufsz,
+ const char *attr)
{
int len;
int host;
+ const char *prefix;
- if (sysfs_scsi_get_hctl(cxt, &host, NULL, NULL, NULL))
+ if (sysfs_blkdev_scsi_get_hctl(pc, &host, NULL, NULL, NULL))
return NULL;
+ prefix = ul_path_get_prefix(pc);
+ if (!prefix)
+ prefix = "";
+
if (attr)
- len = snprintf(buf, bufsz, _PATH_SYS_CLASS "/%s_host/host%d/%s",
- type, host, attr);
+ len = snprintf(buf, bufsz, "%s%s/%s_host/host%d/%s",
+ prefix, _PATH_SYS_CLASS, type, host, attr);
else
- len = snprintf(buf, bufsz, _PATH_SYS_CLASS "/%s_host/host%d",
- type, host);
+ len = snprintf(buf, bufsz, "%s%s/%s_host/host%d",
+ prefix, _PATH_SYS_CLASS, type, host);
- return (len < 0 || (size_t) len + 1 > bufsz) ? NULL : buf;
+ return (len < 0 || (size_t) len >= bufsz) ? NULL : buf;
}
-char *sysfs_scsi_host_strdup_attribute(struct sysfs_cxt *cxt,
- const char *type, const char *attr)
+char *sysfs_blkdev_scsi_host_strdup_attribute(struct path_cxt *pc,
+ const char *type, const char *attr)
{
char buf[1024];
int rc;
FILE *f;
if (!attr || !type ||
- !sysfs_scsi_host_attribute_path(cxt, type, buf, sizeof(buf), attr))
+ !scsi_host_attribute_path(pc, type, buf, sizeof(buf), attr))
return NULL;
if (!(f = fopen(buf, "r" UL_CLOEXECSTR)))
return rc == 1 ? strdup(buf) : NULL;
}
-int sysfs_scsi_host_is(struct sysfs_cxt *cxt, const char *type)
+int sysfs_blkdev_scsi_host_is(struct path_cxt *pc, const char *type)
{
char buf[PATH_MAX];
struct stat st;
- if (!type || !sysfs_scsi_host_attribute_path(cxt, type,
+ if (!type || !scsi_host_attribute_path(pc, type,
buf, sizeof(buf), NULL))
return 0;
return stat(buf, &st) == 0 && S_ISDIR(st.st_mode);
}
-static char *sysfs_scsi_attribute_path(struct sysfs_cxt *cxt,
+static char *scsi_attribute_path(struct path_cxt *pc,
char *buf, size_t bufsz, const char *attr)
{
int len, h, c, t, l;
+ const char *prefix;
- if (sysfs_scsi_get_hctl(cxt, &h, &c, &t, &l) != 0)
+ if (sysfs_blkdev_scsi_get_hctl(pc, &h, &c, &t, &l) != 0)
return NULL;
+ prefix = ul_path_get_prefix(pc);
+ if (!prefix)
+ prefix = "";
+
if (attr)
- len = snprintf(buf, bufsz, _PATH_SYS_SCSI "/devices/%d:%d:%d:%d/%s",
+ len = snprintf(buf, bufsz, "%s%s/devices/%d:%d:%d:%d/%s",
+ prefix, _PATH_SYS_SCSI,
h,c,t,l, attr);
else
- len = snprintf(buf, bufsz, _PATH_SYS_SCSI "/devices/%d:%d:%d:%d",
+ len = snprintf(buf, bufsz, "%s%s/devices/%d:%d:%d:%d",
+ prefix, _PATH_SYS_SCSI,
h,c,t,l);
- return (len < 0 || (size_t) len + 1 > bufsz) ? NULL : buf;
+ return (len < 0 || (size_t) len >= bufsz) ? NULL : buf;
}
-int sysfs_scsi_has_attribute(struct sysfs_cxt *cxt, const char *attr)
+int sysfs_blkdev_scsi_has_attribute(struct path_cxt *pc, const char *attr)
{
char path[PATH_MAX];
struct stat st;
- if (!sysfs_scsi_attribute_path(cxt, path, sizeof(path), attr))
+ if (!scsi_attribute_path(pc, path, sizeof(path), attr))
return 0;
return stat(path, &st) == 0;
}
-int sysfs_scsi_path_contains(struct sysfs_cxt *cxt, const char *pattern)
+int sysfs_blkdev_scsi_path_contains(struct path_cxt *pc, const char *pattern)
{
char path[PATH_MAX], linkc[PATH_MAX];
struct stat st;
ssize_t len;
- if (!sysfs_scsi_attribute_path(cxt, path, sizeof(path), NULL))
+ if (!scsi_attribute_path(pc, path, sizeof(path), NULL))
return 0;
if (stat(path, &st) != 0)
return strstr(linkc, pattern) != NULL;
}
+static dev_t read_devno(const char *path)
+{
+ FILE *f;
+ int maj = 0, min = 0;
+ dev_t dev = 0;
+
+ f = fopen(path, "r" UL_CLOEXECSTR);
+ if (!f)
+ return 0;
+
+ if (fscanf(f, "%d:%d", &maj, &min) == 2)
+ dev = makedev(maj, min);
+ fclose(f);
+ return dev;
+}
+
+dev_t __sysfs_devname_to_devno(const char *prefix, const char *name, const char *parent)
+{
+ char buf[PATH_MAX];
+ char *_name = NULL; /* name as encoded in sysfs */
+ dev_t dev = 0;
+ int len;
+
+ if (!prefix)
+ prefix = "";
+
+ assert(name);
+
+ if (strncmp("/dev/", name, 5) == 0) {
+ /*
+ * Read from /dev
+ */
+ struct stat st;
+
+ if (stat(name, &st) == 0) {
+ dev = st.st_rdev;
+ goto done;
+ }
+ name += 5; /* unaccesible, or not node in /dev */
+ }
+
+ _name = strdup(name);
+ if (!_name)
+ goto done;
+ sysfs_devname_dev_to_sys(_name);
+
+ if (parent && strncmp("dm-", name, 3)) {
+ /*
+ * Create path to /sys/block/<parent>/<name>/dev
+ */
+ char *_parent = strdup(parent);
+
+ if (!_parent) {
+ free(_parent);
+ goto done;
+ }
+ sysfs_devname_dev_to_sys(_parent);
+ len = snprintf(buf, sizeof(buf),
+ "%s" _PATH_SYS_BLOCK "/%s/%s/dev",
+ prefix, _parent, _name);
+ free(_parent);
+ if (len < 0 || (size_t) len >= sizeof(buf))
+ goto done;
+
+ /* don't try anything else for dm-* */
+ dev = read_devno(buf);
+ goto done;
+ }
+
+ /*
+ * Read from /sys/block/<sysname>/dev
+ */
+ len = snprintf(buf, sizeof(buf),
+ "%s" _PATH_SYS_BLOCK "/%s/dev",
+ prefix, _name);
+ if (len < 0 || (size_t) len >= sizeof(buf))
+ goto done;
+ dev = read_devno(buf);
+
+ if (!dev) {
+ /*
+ * Read from /sys/block/<sysname>/device/dev
+ */
+ len = snprintf(buf, sizeof(buf),
+ "%s" _PATH_SYS_BLOCK "/%s/device/dev",
+ prefix, _name);
+ if (len < 0 || (size_t) len >= sizeof(buf))
+ goto done;
+ dev = read_devno(buf);
+ }
+done:
+ free(_name);
+ return dev;
+}
+
+dev_t sysfs_devname_to_devno(const char *name)
+{
+ return __sysfs_devname_to_devno(NULL, name, NULL);
+}
+
+char *sysfs_blkdev_get_path(struct path_cxt *pc, char *buf, size_t bufsiz)
+{
+ const char *name = sysfs_blkdev_get_name(pc, buf, bufsiz);
+ char *res = NULL;
+ size_t sz;
+ struct stat st;
+
+ if (!name)
+ goto done;
+
+ sz = strlen(name);
+ if (sz + sizeof("/dev/") > bufsiz)
+ goto done;
+
+ /* create the final "/dev/<name>" string */
+ memmove(buf + 5, name, sz + 1);
+ memcpy(buf, "/dev/", 5);
+
+ if (!stat(buf, &st) && S_ISBLK(st.st_mode) && st.st_rdev == sysfs_blkdev_get_devno(pc))
+ res = buf;
+done:
+ return res;
+}
+
+dev_t sysfs_blkdev_get_devno(struct path_cxt *pc)
+{
+ return ((struct sysfs_blkdev *) ul_path_get_dialect(pc))->devno;
+}
+
+/*
+ * Returns devname (e.g. "/dev/sda1") for the given devno.
+ *
+ * Please, use more robust blkid_devno_to_devname() in your applications.
+ */
+char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz)
+{
+ struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL);
+ char *res = NULL;
+
+ if (pc) {
+ res = sysfs_blkdev_get_path(pc, buf, bufsiz);
+ ul_unref_path(pc);
+ }
+ return res;
+}
+
+char *sysfs_devno_to_devname(dev_t devno, char *buf, size_t bufsiz)
+{
+ struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL);
+ char *res = NULL;
+
+ if (pc) {
+ res = sysfs_blkdev_get_name(pc, buf, bufsiz);
+ ul_unref_path(pc);
+ }
+ return res;
+}
+
+
+
#ifdef TEST_PROGRAM_SYSFS
#include <errno.h>
#include <err.h>
int main(int argc, char *argv[])
{
- struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
+ struct path_cxt *pc;
char *devname;
- dev_t devno;
+ dev_t devno, disk_devno;
char path[PATH_MAX], *sub, *chain;
- int i, is_part;
+ char diskname[32];
+ int i, is_part, rc = EXIT_SUCCESS;
uint64_t u64;
- ssize_t len;
if (argc != 2)
errx(EXIT_FAILURE, "usage: %s <devname>", argv[0]);
+ ul_sysfs_init_debug();
+
devname = argv[1];
- devno = sysfs_devname_to_devno(devname, NULL);
+ devno = sysfs_devname_to_devno(devname);
if (!devno)
err(EXIT_FAILURE, "failed to read devno");
- is_part = sysfs_devno_has_attribute(devno, "partition");
+ printf("non-context:\n");
+ printf(" DEVNO: %u (%d:%d)\n", (unsigned int) devno, major(devno), minor(devno));
+ printf(" DEVNAME: %s\n", sysfs_devno_to_devname(devno, path, sizeof(path)));
+ printf(" DEVPATH: %s\n", sysfs_devno_to_devpath(devno, path, sizeof(path)));
- printf("NAME: %s\n", devname);
- printf("DEVNO: %u (%d:%d)\n", (unsigned int) devno, major(devno), minor(devno));
- printf("DEVNOPATH: %s\n", sysfs_devno_path(devno, path, sizeof(path)));
- printf("DEVPATH: %s\n", sysfs_devno_to_devpath(devno, path, sizeof(path)));
- printf("PARTITION: %s\n", is_part ? "YES" : "NOT");
+ sysfs_devno_to_wholedisk(devno, diskname, sizeof(diskname), &disk_devno);
+ printf(" WHOLEDISK-DEVNO: %u (%d:%d)\n", (unsigned int) disk_devno, major(disk_devno), minor(disk_devno));
+ printf(" WHOLEDISK-DEVNAME: %s\n", diskname);
- if (sysfs_init(&cxt, devno, NULL))
- return EXIT_FAILURE;
+ pc = ul_new_sysfs_path(devno, NULL, NULL);
+ if (!pc)
+ goto done;
- len = sysfs_readlink(&cxt, NULL, path, sizeof(path) - 1);
- if (len > 0) {
- path[len] = '\0';
- printf("DEVNOLINK: %s\n", path);
+ printf("context based:\n");
+ devno = sysfs_blkdev_get_devno(pc);
+ printf(" DEVNO: %u (%d:%d)\n", (unsigned int) devno, major(devno), minor(devno));
+ printf(" DEVNAME: %s\n", sysfs_blkdev_get_name(pc, path, sizeof(path)));
+ printf(" DEVPATH: %s\n", sysfs_blkdev_get_path(pc, path, sizeof(path)));
+
+ sysfs_devno_to_wholedisk(devno, diskname, sizeof(diskname), &disk_devno);
+ printf(" WHOLEDISK-DEVNO: %u (%d:%d)\n", (unsigned int) disk_devno, major(disk_devno), minor(disk_devno));
+ printf(" WHOLEDISK-DEVNAME: %s\n", diskname);
+
+ is_part = ul_path_access(pc, F_OK, "partition") == 0;
+ printf(" PARTITION: %s\n", is_part ? "YES" : "NOT");
+
+ if (is_part && disk_devno) {
+ struct path_cxt *disk_pc = ul_new_sysfs_path(disk_devno, NULL, NULL);
+ sysfs_blkdev_set_parent(pc, disk_pc);
+
+ ul_unref_path(disk_pc);
}
+ printf(" HOTPLUG: %s\n", sysfs_blkdev_is_hotpluggable(pc) ? "yes" : "no");
+ printf(" SLAVES: %d\n", ul_path_count_dirents(pc, "slaves"));
+
if (!is_part) {
printf("First 5 partitions:\n");
for (i = 1; i <= 5; i++) {
- dev_t dev = sysfs_partno_to_devno(&cxt, i);
+ dev_t dev = sysfs_blkdev_partno_to_devno(pc, i);
if (dev)
printf("\t#%d %d:%d\n", i, major(dev), minor(dev));
}
}
- printf("SLAVES: %d\n", sysfs_count_dirents(&cxt, "slaves"));
-
- if (sysfs_read_u64(&cxt, "size", &u64))
- printf("read SIZE failed\n");
+ if (ul_path_read_u64(pc, &u64, "size") != 0)
+ printf(" (!) read SIZE failed\n");
else
- printf("SIZE: %jd\n", u64);
+ printf(" SIZE: %jd\n", u64);
- if (sysfs_read_int(&cxt, "queue/hw_sector_size", &i))
- printf("read SECTOR failed\n");
+ if (ul_path_read_s32(pc, &i, "queue/hw_sector_size"))
+ printf(" (!) read SECTOR failed\n");
else
- printf("SECTOR: %d\n", i);
+ printf(" SECTOR: %d\n", i);
- printf("DEVNAME: %s\n", sysfs_get_devname(&cxt, path, sizeof(path)));
- printf("HOTPLUG: %s\n", sysfs_is_hotpluggable(&cxt) ? "yes" : "no");
- chain = sysfs_get_devchain(&cxt, path, sizeof(path));
- printf("SUBSUSTEMS:\n");
+ chain = sysfs_blkdev_get_devchain(pc, path, sizeof(path));
+ printf(" SUBSUSTEMS:\n");
- while (chain && sysfs_next_subsystem(&cxt, chain, &sub) == 0) {
+ while (chain && sysfs_blkdev_next_subsystem(pc, chain, &sub) == 0) {
printf("\t%s\n", sub);
free(sub);
}
-
- sysfs_deinit(&cxt);
- return EXIT_SUCCESS;
+ rc = EXIT_SUCCESS;
+done:
+ ul_unref_path(pc);
+ return rc;
}
-#endif
+#endif /* TEST_PROGRAM_SYSFS */
projects / thirdparty / util-linux.git / blobdiff