Hi,
On Tue, 14 Nov 2017 23:01:26 -0800 S. Lockwood-Childs 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.
>
> Forward-ported from this patch:
> http://patchwork.ozlabs.org/patch/619305/
>
> Original patch:
> Signed-off-by: Marcin Niestroj <m.niest...@grinn-global.com>
>
> Forward port:
> Signed-off-by: S. Lockwood-Childs <s...@vctlabs.com>
> ---
> tools/env/fw_env.c | 255
> +++++++++++++++++++++++++++++++++++++++++++++++-
> tools/env/fw_env.config | 8 ++
> 2 files changed, 261 insertions(+), 2 deletions(-)
>
> diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
> index ab06415..867fba5 100644
> --- a/tools/env/fw_env.c
> +++ b/tools/env/fw_env.c
> @@ -25,6 +25,7 @@
> #include <sys/ioctl.h>
> #include <sys/stat.h>
> #include <unistd.h>
> +#include <dirent.h>
>
> #ifdef MTD_OLD
> # include <stdint.h>
> @@ -34,6 +35,8 @@
> # include <mtd/mtd-user.h>
> #endif
>
> +#include <mtd/ubi-user.h>
> +
> #include "fw_env_private.h"
> #include "fw_env.h"
>
> @@ -58,6 +61,7 @@ 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] =
> @@ -76,6 +80,7 @@ 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)
>
> @@ -122,6 +127,228 @@ 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];
>
/usr/include/linux/limits.h specifies the constant 'PATH_MAX' which
should be used here.
> + 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;
>
This can never be reached.
> +}
> +
> +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.
>
This sentence no sense.
> + *
> + * 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);
>
'%zu' is an appropriate format string for size_t values. No need for a
type cast.
> @@ -1347,8 +1587,12 @@ int fw_env_close(struct env_opts *opts)
> static int check_device_config(int dev)
> {
> struct stat st;
> + int32_t lnum = 0;
>
This could be defined right before the ioctl, which is the only user of
this variable.
> int fd, rc = 0;
>
> + /* Fills in IS_UBI(), converts DEVNAME() with ubi volume name */
> + ubi_check_dev(dev);
> +
> fd = open(DEVNAME(dev), O_RDONLY);
> if (fd < 0) {
> fprintf(stderr,
> @@ -1364,7 +1608,14 @@ static int check_device_config(int dev)
> goto err;
> }
>
> - if (S_ISCHR(st.st_mode)) {
> + if (IS_UBI(dev)) {
> + rc = ioctl(fd, UBI_IOCEBISMAP, &lnum);
> + if (rc < 0) {
> + fprintf(stderr, "Cannot get UBI information for %s\n",
> + DEVNAME(dev));
> + goto err;
> + }
> + } else if (S_ISCHR(st.st_mode)) {
> struct mtd_info_user mtdinfo;
> rc = ioctl(fd, MEMGETINFO, &mtdinfo);
> if (rc < 0) {
Lothar Waßmann
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