From a10353584f93334b5687c598a15260c0fc5b8d3e Mon Sep 17 00:00:00 2001 From: Xiaolei Li Date: Tue, 10 Apr 2018 15:36:55 +0800 Subject: libmtd: Add support to access OOB available size This patch exposes OOB available size to user. Then user can use OOB free area according to OOB available size. Steps to get OOB available size: First, access /sys/class/mtd/mtdX/oobavail. If not exist, then try to get ecc layout by ioctl "ECCGETLAYOUT". If none of them work, set OOB available size to 0. Signed-off-by: Xiaolei Li Signed-off-by: David Oberhollenzer --- lib/libmtd.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'lib/libmtd.c') diff --git a/lib/libmtd.c b/lib/libmtd.c index 86c89ae..7382229 100644 --- a/lib/libmtd.c +++ b/lib/libmtd.c @@ -614,6 +614,10 @@ libmtd_t libmtd_open(void) if (!lib->mtd_oob_size) goto out_error; + lib->mtd_oobavail = mkpath(lib->mtd, MTD_OOBAVAIL); + if (!lib->mtd_oobavail) + goto out_error; + lib->mtd_region_cnt = mkpath(lib->mtd, MTD_REGION_CNT); if (!lib->mtd_region_cnt) goto out_error; @@ -637,6 +641,7 @@ void libmtd_close(libmtd_t desc) free(lib->mtd_flags); free(lib->mtd_region_cnt); free(lib->mtd_oob_size); + free(lib->mtd_oobavail); free(lib->mtd_subpage_size); free(lib->mtd_min_io_size); free(lib->mtd_size); @@ -769,6 +774,15 @@ int mtd_get_dev_info1(libmtd_t desc, int mtd_num, struct mtd_dev_info *mtd) return -1; if (dev_read_pos_int(lib->mtd_oob_size, mtd_num, &mtd->oob_size)) return -1; + if (dev_read_pos_int(lib->mtd_oobavail, mtd_num, &mtd->oobavail)) { + /* + * Fail to access oobavail sysfs file, + * try ioctl ECCGETLAYOUT. */ + mtd->oobavail = legacy_get_mtd_oobavail1(mtd_num); + /* Set 0 as default if can not get valid ecc layout */ + if (mtd->oobavail < 0) + mtd->oobavail = 0; + } if (dev_read_pos_int(lib->mtd_region_cnt, mtd_num, &mtd->region_cnt)) return -1; if (dev_read_hex_int(lib->mtd_flags, mtd_num, &ret)) -- cgit v1.2.3