Re: [U-Boot] [PATCH 2/2] tools: env: Add support for direct read/write UBI volumes

On 06.05.2016 14:58, Marcin Niestroj wrote:

Up to now we were able to read/write environment data from/to UBI volumes only indirectly by gluebi driver. This driver creates NAND MTD on top of UBI volumes, which is quite a workaroung for this use case.

Add support for direct read/write UBI volumes in order to not use obsolete gluebi driver.

Signed-off-by: Marcin Niestroj m.niestroj@grinn-global.com

tools/env/fw_env.c | 249 +++++++++++++++++++++++++++++++++++++++++++++++- tools/env/fw_env.config | 8 ++ 2 files changed, 256 insertions(+), 1 deletion(-)

diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c index b4b542a..0e977e3 100644 --- a/tools/env/fw_env.c +++ b/tools/env/fw_env.c @@ -24,6 +24,7 @@ #include <sys/ioctl.h> #include <sys/stat.h> #include <unistd.h> +#include <dirent.h>

#ifdef MTD_OLD # include <stdint.h> @@ -33,6 +34,8 @@ # include <mtd/mtd-user.h> #endif

+#include <mtd/ubi-user.h>

#include "fw_env.h"

struct common_args common_args; @@ -54,6 +57,7 @@ struct envdev_s { ulong erase_size; /* device erase size */ ulong env_sectors; /* number of environment sectors */ uint8_t mtd_type; /* type of the MTD device */

• int is_ubi; /* set if we use UBI volume */

};

static struct envdev_s envdevices[2] = @@ -72,6 +76,7 @@ static int dev_current; #define DEVESIZE(i) envdevices[(i)].erase_size #define ENVSECTORS(i) envdevices[(i)].env_sectors #define DEVTYPE(i) envdevices[(i)].mtd_type +#define IS_UBI(i) envdevices[(i)].is_ubi

#define CUR_ENVSIZE ENVSIZE(dev_current)

@@ -117,6 +122,229 @@ static unsigned char obsolete_flag = 0; #define DEFAULT_ENV_INSTANCE_STATIC #include <env_default.h>

+#define UBI_DEV_START "/dev/ubi" +#define UBI_SYSFS "/sys/class/ubi" +#define UBI_VOL_NAME_PATT "ubi%d_%d"

+static int is_ubi_devname(const char *devname) +{

• return !strncmp(devname, UBI_DEV_START, sizeof(UBI_DEV_START) - 1);

+}

+static int ubi_check_volume_sysfs_name(const char *volume_sysfs_name,

• 		const char *volname)
  

+{

• char path[256];
• FILE *file;
• char *name;
• int ret;
• strcpy(path, UBI_SYSFS "/");
• strcat(path, volume_sysfs_name);
• strcat(path, "/name");
• file = fopen(path, "r");
• if (!file)

• return -1;
  

• ret = fscanf(file, "%ms", &name);
• fclose(file);
• if (ret <= 0 || !name) {

• fprintf(stderr,
  

• 	"Failed to read from file %s, ret = %d, name = %s\n",
  

• 	path, ret, name);
  

• return -1;
  

• }
• if (!strcmp(name, volname)) {

• free(name);
  

• return 0;
  

• }
• free(name);
• return -1;

+}

+static int ubi_get_volnum_by_name(int devnum, const char *volname) +{

• DIR *sysfs_ubi;
• struct dirent *dirent;
• int ret;
• int tmp_devnum;
• int volnum;
• sysfs_ubi = opendir(UBI_SYSFS);
• if (!sysfs_ubi)

• return -1;
  

+#ifdef DEBUG

• fprintf(stderr, "Looking for volume name "%s"\n", volname);

+#endif

• while (1) {

• dirent = readdir(sysfs_ubi);
  

• if (!dirent)
  

• 	return -1;
  

• ret = sscanf(dirent->d_name, UBI_VOL_NAME_PATT,
  

• 		&tmp_devnum, &volnum);
  

• if (ret == 2 && devnum == tmp_devnum) {
  

• 	if (ubi_check_volume_sysfs_name(dirent->d_name,
  

• 						volname) == 0)
  

• 		return volnum;
  

• }
  

• }
• return -1;

+}

+static int ubi_get_devnum_by_devname(const char *devname) +{

• int devnum;
• int ret;
• ret = sscanf(devname + sizeof(UBI_DEV_START) - 1, "%d", &devnum);
• if (ret != 1)

• return -1;
  

• return devnum;

+}

+static const char *ubi_get_volume_devname(const char *devname,

• 			const char *volname)
  

+{

• char *volume_devname;
• int volnum;
• int devnum;
• int ret;
• devnum = ubi_get_devnum_by_devname(devname);
• if (devnum < 0)

• return NULL;
  

• volnum = ubi_get_volnum_by_name(devnum, volname);
• if (volnum < 0)

• return NULL;
  

• ret = asprintf(&volume_devname, "%s_%d", devname, volnum);
• if (ret < 0)

• return NULL;
  

+#ifdef DEBUG

• fprintf(stderr, "Found ubi volume "%s:%s" -> %s\n",

• devname, volname, volume_devname);
  

+#endif

• return volume_devname;

+}

+static void ubi_check_dev(unsigned int dev_id) +{

• char *devname = (char *) DEVNAME(dev_id);
• char *pname;
• const char *volname = NULL;
• const char *volume_devname;
• if (!is_ubi_devname(DEVNAME(dev_id)))

• return;
  

• IS_UBI(dev_id) = 1;
• for (pname = devname; *pname != '\0'; pname++) {

• if (*pname == ':') {
  

• 	*pname = '\0';
  

• 	volname = pname + 1;
  

• 	break;
  

• }
  

• }
• if (volname) {

• /* Let's find real volume device name */
  

• volume_devname = ubi_get_volume_devname(devname,
  

• 					volname);
  

• if (!volume_devname) {
  

• 	fprintf(stderr, "Didn't found ubi volume \"%s\"\n",
  

• 		volname);
  

• 	return;
  

• }
  

• free(devname);
  

• DEVNAME(dev_id) = volume_devname;
  

• }

+}

+static int ubi_update_start(int fd, int64_t bytes) +{

• if (ioctl(fd, UBI_IOCVOLUP, &bytes))

• return -1;
  

• return 0;

+}

+static int ubi_read(int fd, void *buf, size_t count) +{

• ssize_t ret;
• while (count > 0) {

• ret = read(fd, buf, count);
  

• if (ret > 0) {
  

• 	count -= ret;
  

• 	buf += ret;
  

• 	continue;
  

• }
  

• if (ret == 0) {
  

• 	/*
  

• 	 * Happens in case of too short volume data size. If we
  

• 	 * return error status we will fail it will be treated
  

• 	 * as UBI device error.
  

• 	 *
  

• 	 * Leave catching this error to CRC check.
  

• 	 */
  

• 	fprintf(stderr, "Warning: end of data on ubi volume\n");
  

• 	return 0;
  

• } else if (errno == EBADF) {
  

• 	/*
  

• 	 * Happens in case of corrupted volume. The same as
  

• 	 * above, we cannot return error now, as we will still
  

• 	 * be able to successfully write environment later.
  

• 	 */
  

• 	fprintf(stderr, "Warning: corrupted volume?\n");
  

• 	return 0;
  

• } else if (errno == EINTR) {
  

• 	continue;
  

• }
  

• fprintf(stderr, "Cannot read %u bytes from ubi volume, %s\n",
  

• 	(unsigned int) count, strerror(errno));
  

• return -1;
  

• }
• return 0;

+}

+static int ubi_write(int fd, const void *buf, size_t count) +{

• ssize_t ret;
• while (count > 0) {

• ret = write(fd, buf, count);
  

• if (ret <= 0) {
  

• 	if (ret < 0 && errno == EINTR)
  

• 		continue;
  

• 	fprintf(stderr, "Cannot write %u bytes to ubi volume\n",
  

• 		(unsigned int) count);
  

• 	return -1;
  

• }
  

• count -= ret;
  

• buf += ret;
  

• }
• return 0;

+}

static int flash_io (int mode); static char *envmatch (char * s1, char * s2); static int parse_config (void); @@ -997,6 +1225,12 @@ static int flash_write (int fd_current, int fd_target, int dev_target) DEVOFFSET (dev_target), DEVNAME (dev_target)); #endif

• if (IS_UBI(dev_target)) {

• if (ubi_update_start(fd_target, CUR_ENVSIZE) < 0)
  

• 	return 0;
  

• return ubi_write(fd_target, environment.image, CUR_ENVSIZE);
  

• }
• rc = flash_write_buf(dev_target, fd_target, environment.image, CUR_ENVSIZE, DEVOFFSET(dev_target), DEVTYPE(dev_target));

@@ -1024,6 +1258,12 @@ static int flash_read (int fd) struct stat st; int rc;

• if (IS_UBI(dev_current)) {

• DEVTYPE(dev_current) = MTD_ABSENT;
  

• return ubi_read(fd, environment.image, CUR_ENVSIZE);
  

• }
• rc = fstat(fd, &st); if (rc < 0) { fprintf(stderr, "Cannot stat the file %s\n",

@@ -1236,7 +1476,8 @@ int fw_env_open(void) DEVTYPE(!dev_current) == MTD_UBIVOLUME) { environment.flag_scheme = FLAG_INCREMENTAL; } else if (DEVTYPE(dev_current) == MTD_ABSENT &&

• 	   DEVTYPE(!dev_current) == MTD_ABSENT) {
  

• 	   DEVTYPE(!dev_current) == MTD_ABSENT &&
  

• 	   IS_UBI(dev_current) == IS_UBI(!dev_current)) {
  environment.flag_scheme = FLAG_INCREMENTAL;
  

  } else { fprintf (stderr, "Incompatible flash types!\n");

@@ -1369,6 +1610,12 @@ static int parse_config () HaveRedundEnv = 1; #endif #endif

• /* Fills in IS_UBI(), converts DEVNAME() with ubi volume name */
• ubi_check_dev(0);
• if (HaveRedundEnv)

• ubi_check_dev(1);
  

• if (stat (DEVNAME (0), &st)) { fprintf (stderr, "Cannot access MTD device %s: %s\n",

diff --git a/tools/env/fw_env.config b/tools/env/fw_env.config index 6f216f9..db5498a 100644 --- a/tools/env/fw_env.config +++ b/tools/env/fw_env.config @@ -23,3 +23,11 @@

# VFAT example #/boot/uboot.env 0x0000 0x4000

+# UBI volume +#/dev/ubi0_0 0x0 0x20000 +#/dev/ubi0_1 0x0 0x20000

+# UBI volume by name +#/dev/ubi0:env 0x0 0x20000 +#/dev/ubi0:env-redund 0x0 0x20000