diff options
| -rw-r--r-- | ubi-utils/include/libubi.h | 30 | ||||
| -rw-r--r-- | ubi-utils/src/libubi.c | 127 | ||||
| -rw-r--r-- | ubi-utils/src/libubi_int.h | 1 |
3 files changed, 145 insertions, 13 deletions
diff --git a/ubi-utils/include/libubi.h b/ubi-utils/include/libubi.h index f52904d..64b5eed 100644 --- a/ubi-utils/include/libubi.h +++ b/ubi-utils/include/libubi.h @@ -44,6 +44,7 @@ typedef void * libubi_t; * (%UBI_DEV_NUM_AUTO should be used to automatically assign the * number) * @mtd_num: MTD device number to attach + * @dev: path to device node to attach * @vid_hdr_offset: VID header offset (%0 means default offset and this is what * most of the users want) */ @@ -51,6 +52,7 @@ struct ubi_attach_request { int dev_num; int mtd_num; + const char *dev; int vid_hdr_offset; }; @@ -219,6 +221,23 @@ int ubi_attach_mtd(libubi_t desc, const char *node, struct ubi_attach_request *req); /** + * ubi_attach - attach an MTD device by its node path. + * @desc: UBI library descriptor + * @node: name of the UBI control character device node + * @req: MTD attach request + * + * This function creates new UBI device by attaching an MTD device described by + * @req. If @req->dev is given it should contain path to the MTD device node. + * Otherwise functionality is similar than in function 'ubi_attach_mtd()' where + * @req->mtd_num is used. + * + * Returns %0 in case of success and %-1 in case of failure (errno is set). The + * newly created UBI device number is returned in @req->dev_num. + */ +int ubi_attach(libubi_t desc, const char *node, + struct ubi_attach_request *req); + +/** * ubi_detach_mtd - detach an MTD device. * @desc: UBI library descriptor * @node: name of the UBI control character device node @@ -231,6 +250,17 @@ int ubi_attach_mtd(libubi_t desc, const char *node, int ubi_detach_mtd(libubi_t desc, const char *node, int mtd_num); /** + * ubi_detach - detach an MTD device by its node path. + * @desc: UBI library descriptor + * @node: name of the UBI control character device node + * @dev: path to an MTD device node + * + * This function detaches an MTD device @dev from UBI. Returns zero in case of + * success and %-1 in case of failure. + */ +int ubi_detach(libubi_t desc, const char *node, const char *dev); + +/** * ubi_remove_dev - remove an UBI device. * @desc: UBI library descriptor * @node: name of the UBI control character device node diff --git a/ubi-utils/src/libubi.c b/ubi-utils/src/libubi.c index fd97774..2f19bd7 100644 --- a/ubi-utils/src/libubi.c +++ b/ubi-utils/src/libubi.c @@ -677,35 +677,120 @@ void libubi_close(libubi_t desc) free(lib); } -int ubi_attach_mtd(libubi_t desc, const char *node, - struct ubi_attach_request *req) +/** + * do_attach - perform the actual attach operation. + * @node: name of the UBI control character device node + * @r: attach request + * + * This function performs the actual UBI attach operation. Returns %0 in case of + * success and %-1 in case of failure. @r->ubi_num contains newly created UBI + * device number. + */ +static int do_attach(const char *node, const struct ubi_attach_req *r) { int fd, ret; - struct ubi_attach_req r; - - memset(&r, 0, sizeof(struct ubi_attach_req)); - - desc = desc; - r.ubi_num = req->dev_num; - r.mtd_num = req->mtd_num; - r.vid_hdr_offset = req->vid_hdr_offset; fd = open(node, O_RDONLY); if (fd == -1) return sys_errmsg("cannot open \"%s\"", node); - ret = ioctl(fd, UBI_IOCATT, &r); + ret = ioctl(fd, UBI_IOCATT, r); close(fd); if (ret == -1) return -1; - req->dev_num = r.ubi_num; - #ifdef UDEV_SETTLE_HACK // if (system("udevsettle") == -1) // return -1; usleep(100000); #endif + return ret; +} + +int ubi_attach_mtd(libubi_t desc, const char *node, + struct ubi_attach_request *req) +{ + struct ubi_attach_req r; + int ret; + + (void)desc; + + memset(&r, 0, sizeof(struct ubi_attach_req)); + r.ubi_num = req->dev_num; + r.mtd_num = req->mtd_num; + r.vid_hdr_offset = req->vid_hdr_offset; + + ret = do_attach(node, &r); + if (ret == 0) + req->dev_num = r.ubi_num; + + return ret; +} + +#ifndef MTD_CHAR_MAJOR +/* + * This is taken from kernel <linux/mtd/mtd.h> and is unlikely to change anytime + * soon. + */ +#define MTD_CHAR_MAJOR 90 +#endif + +/** + * dev_to_mtdnum - converts device node to MTD number. + * @dev: path to device node to convert + * + * This function converts given @dev to MTD device number. @dev should contain + * path to the MTD device node. Returns MTD device number in case of success and + * %-1 in case of failure (errno is set). + */ +static int dev_to_mtdnum(const char *dev) +{ + int major, minor; + struct stat sb; + + if (stat(dev, &sb) < 0) + return sys_errmsg("cannot stat \"%s\"", dev); + + if (!S_ISCHR(sb.st_mode)) { + errno = EINVAL; + return sys_errmsg("\"%s\" is not a character device", dev); + } + + major = major(sb.st_rdev); + minor = minor(sb.st_rdev); + + if (major != MTD_CHAR_MAJOR) { + errno = EINVAL; + return sys_errmsg("\"%s\" is not an MTD device", dev); + } + + return minor / 2; +} + +int ubi_attach(libubi_t desc, const char *node, struct ubi_attach_request *req) +{ + struct ubi_attach_req r; + int ret; + + if (!req->dev) + /* Fallback to opening by mtd_num */ + return ubi_attach_mtd(desc, node, req); + + memset(&r, 0, sizeof(struct ubi_attach_req)); + r.ubi_num = req->dev_num; + r.vid_hdr_offset = req->vid_hdr_offset; + + /* + * User has passed path to device node. Lets find out MTD device number + * of the device and pass it to the kernel. + */ + r.mtd_num = dev_to_mtdnum(req->dev); + if (r.mtd_num == -1) + return -1; + + ret = do_attach(node, &r); + if (ret == 0) + req->dev_num = r.ubi_num; return ret; } @@ -723,6 +808,22 @@ int ubi_detach_mtd(libubi_t desc, const char *node, int mtd_num) return ubi_remove_dev(desc, node, ubi_dev); } +int ubi_detach(libubi_t desc, const char *node, const char *dev) +{ + int mtd_num; + + if (!dev) { + errno = EINVAL; + return -1; + } + + mtd_num = dev_to_mtdnum(dev); + if (mtd_num == -1) + return -1; + + return ubi_detach_mtd(desc, node, mtd_num); +} + int ubi_remove_dev(libubi_t desc, const char *node, int ubi_dev) { int fd, ret; diff --git a/ubi-utils/src/libubi_int.h b/ubi-utils/src/libubi_int.h index 6d17d57..c3aa37a 100644 --- a/ubi-utils/src/libubi_int.h +++ b/ubi-utils/src/libubi_int.h @@ -83,6 +83,7 @@ extern "C" { * handling * @dev_max_vols: maximum volumes number count sysfs path pattern * @dev_min_io_size: minimum I/O unit size sysfs path pattern + * @dev_mtd_num: MTD device number * @ubi_vol: UBI volume sysfs directory pattern * @vol_type: volume type sysfs path pattern * @vol_dev: volume major/minor numbers file pattern |