diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libmtd.c | 58 | ||||
| -rw-r--r-- | lib/libmtd_int.h | 18 |
2 files changed, 70 insertions, 6 deletions
diff --git a/lib/libmtd.c b/lib/libmtd.c index 3ff031c..a976679 100644 --- a/lib/libmtd.c +++ b/lib/libmtd.c @@ -560,6 +560,8 @@ libmtd_t libmtd_open(void) if (!lib) return NULL; + lib->offs64_ioctls = OFFS64_IOCTLS_UNKNOWN; + lib->sysfs_mtd = mkpath("/sys", SYSFS_MTD); if (!lib->sysfs_mtd) goto out_error; @@ -789,13 +791,57 @@ int mtd_get_dev_info(libmtd_t desc, const char *node, struct mtd_dev_info *mtd) return mtd_get_dev_info1(desc, mtd_num, mtd); } -int mtd_erase(const struct mtd_dev_info *mtd, int fd, int eb) +int mtd_erase(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb) { + int ret; + struct libmtd *lib = (struct libmtd *)desc; + struct erase_info_user64 ei64; struct erase_info_user ei; - ei.start = eb * mtd->eb_size;; - ei.length = mtd->eb_size; - return ioctl(fd, MEMERASE, &ei); + if (eb < 0 || eb >= mtd->eb_cnt) { + errmsg("bad eraseblock number %d, mtd%d has %d eraseblocks", + eb, mtd->mtd_num, mtd->eb_cnt); + errno = EINVAL; + return -1; + } + + ei64.start = (__u64)eb * mtd->eb_size; + ei64.length = mtd->eb_size; + + if (lib->offs64_ioctls == OFFS64_IOCTLS_SUPPORTED || + lib->offs64_ioctls == OFFS64_IOCTLS_UNKNOWN) { + ret = ioctl(fd, MEMERASE64, &ei64); + if (ret == 0) + return ret; + + if (errno != ENOTTY || + lib->offs64_ioctls != OFFS64_IOCTLS_UNKNOWN) + return sys_errmsg("MEMERASE64 ioctl failed for " + "eraseblock %d (mtd%d)", + eb, mtd->mtd_num); + + /* + * MEMERASE64 support was added in kernel version 2.6.31, so + * probably we are working with older kernel and this ioctl is + * not supported. + */ + lib->offs64_ioctls = OFFS64_IOCTLS_NOT_SUPPORTED; + } + + if (ei64.start + ei64.length > 0xFFFFFFFF) { + errmsg("this system can address only %u eraseblocks", + 0xFFFFFFFFU / mtd->eb_size); + errno = EINVAL; + return -1; + } + + ei.start = ei64.start; + ei.length = ei64.length; + ret = ioctl(fd, MEMERASE, &ei); + if (ret < 0) + return sys_errmsg("MEMERASE ioctl failed for eraseblock %d " + "(mtd%d)", eb, mtd->mtd_num); + return 0; } /* Patterns to write to a physical eraseblock when torturing it */ @@ -820,7 +866,7 @@ static int check_pattern(const void *buf, uint8_t patt, int size) return 1; } -int mtd_torture(const struct mtd_dev_info *mtd, int fd, int eb) +int mtd_torture(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb) { int err, i, patt_count; void *buf; @@ -835,7 +881,7 @@ int mtd_torture(const struct mtd_dev_info *mtd, int fd, int eb) } for (i = 0; i < patt_count; i++) { - err = mtd_erase(mtd, fd, eb); + err = mtd_erase(desc, mtd, fd, eb); if (err) goto out; diff --git a/lib/libmtd_int.h b/lib/libmtd_int.h index 7de4b42..bb48d35 100644 --- a/lib/libmtd_int.h +++ b/lib/libmtd_int.h @@ -43,6 +43,10 @@ extern "C" { #define MTD_REGION_CNT "numeraseregions" #define MTD_FLAGS "flags" +#define OFFS64_IOCTLS_UNKNOWN 0 +#define OFFS64_IOCTLS_NOT_SUPPORTED 1 +#define OFFS64_IOCTLS_SUPPORTED 2 + /** * libmtd - MTD library description data structure. * @sysfs_mtd: MTD directory in sysfs @@ -58,6 +62,19 @@ extern "C" { * @mtd_region_cnt: count of additional erase regions file pattern * @mtd_flags: MTD device flags file pattern * @sysfs_supported: non-zero if sysfs is supported by MTD + * @offs64_ioctls: %OFFS64_IOCTLS_SUPPORTED if 64-bit %MEMERASE64, + * %MEMREADOOB64, %MEMWRITEOOB64 MTD device ioctls are + * supported, %OFFS64_IOCTLS_NOT_SUPPORTED if not, and + * %OFFS64_IOCTLS_UNKNOWN if it is not known yet; + * + * Note, we cannot find out whether 64-bit ioctls are supported by MTD when we + * are initializing the library, because this requires an MTD device node. + * Indeed, we have to actually call the ioctl and check for %ENOTTY to find + * out whether it is supported or not. + * + * Thus, we leave %offs64_ioctls uninitialized in 'libmtd_open()', and + * initialize it later, when corresponding libmtd function is used, and when + * we actually have a device node and can invoke an ioctl command on it. */ struct libmtd { @@ -74,6 +91,7 @@ struct libmtd char *mtd_region_cnt; char *mtd_flags; unsigned int sysfs_supported:1; + unsigned int offs64_ioctls:2; }; int legacy_libmtd_open(void); |