diff options
Diffstat (limited to 'package/system/ubox/patches/0001-mount_root-fix-jffs2-handling-on-MTD-devices-emulate.patch')
| -rw-r--r-- | package/system/ubox/patches/0001-mount_root-fix-jffs2-handling-on-MTD-devices-emulate.patch | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/package/system/ubox/patches/0001-mount_root-fix-jffs2-handling-on-MTD-devices-emulate.patch b/package/system/ubox/patches/0001-mount_root-fix-jffs2-handling-on-MTD-devices-emulate.patch new file mode 100644 index 0000000000..67805450ba --- /dev/null +++ b/package/system/ubox/patches/0001-mount_root-fix-jffs2-handling-on-MTD-devices-emulate.patch @@ -0,0 +1,176 @@ +From ece50ef6d4b5191636c971ee3896ca22fa538625 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos <juhosg@openwrt.org> +Date: Tue, 5 Nov 2013 16:16:03 +0100 +Subject: [PATCH] mount_root: fix jffs2 handling on MTD devices emulated by + gluebi + +The jffs2_ready() function in mount_root.c checks +the presence of various JFFS2 markers at the start +of a given MTD device. The function works on NOR +flashes because JFFS2 puts 'cleanmarker' nodes at +the start of freshly erased blocks. + +However if jffs2 is used on a MTD device emulated +by the gluebi layer, the 'cleanmarker' nodes are +not present and the jffs2_ready() function fails. + +Update the code to handle jffs2 correctly even on +MTD devices emulated by the gluebi layer. + +Signed-off-by: Gabor Juhos <juhosg@openwrt.org> +--- + mount_root.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++----- + 1 file changed, 83 insertions(+), 7 deletions(-) + +--- a/mount_root.c ++++ b/mount_root.c +@@ -54,6 +54,14 @@ enum { + FS_DEADCODE, + }; + ++enum mtd_type { ++ MTD_TYPE_NOT_FOUND, ++ MTD_TYPE_NOR, ++ MTD_TYPE_NAND, ++ MTD_TYPE_UBI, ++ MTD_TYPE_UNKNOWN, ++}; ++ + static const char *argv0; + + /* this is a raw syscall - man 2 pivot_root */ +@@ -223,6 +231,64 @@ static int find_mtd_char(char *name, cha + return 0; + } + ++static enum mtd_type mtd_get_type(char *index) ++{ ++ static char p[256]; ++ static char buf[32]; ++ FILE *fp; ++ size_t sz; ++ ++ snprintf(p, sizeof(p), "/sys/class/mtd/mtd%s/type", index); ++ ++ fp = fopen(p, "r"); ++ if (!fp) { ++ ERROR("unable to open %s\n", p); ++ return MTD_TYPE_NOT_FOUND; ++ } ++ ++ memset(buf, 0, sizeof(buf)); ++ sz = fread(buf, 1, sizeof(buf) - 1, fp); ++ fclose(fp); ++ ++ if (sz <= 1) { ++ ERROR("unable to read from %s\n", p); ++ return MTD_TYPE_UNKNOWN; ++ } ++ ++ while (sz > 0) { ++ sz--; ++ ++ if (buf[sz] != '\n') ++ break; ++ ++ buf[sz] = 0; ++ } ++ ++ if (strcmp(buf, "nor") == 0) ++ return MTD_TYPE_NOR; ++ ++ if (strcmp(buf, "nand") == 0) ++ return MTD_TYPE_NAND; ++ ++ if (strcmp(buf, "ubi") == 0) ++ return MTD_TYPE_UBI; ++ ++ ERROR("mtd%s has unknow type '%s'\n", index, buf); ++ return MTD_TYPE_UNKNOWN; ++} ++ ++static enum mtd_type mtd_get_type_by_name(char *name) ++{ ++ char *index; ++ ++ index = find_mtd_index(name); ++ if (!index) ++ return MTD_TYPE_NOT_FOUND; ++ ++ return mtd_get_type(index); ++} ++ ++ + static int mtd_unlock(char *mtd) + { + struct erase_info_user mtdlock; +@@ -277,7 +343,7 @@ static int mtd_mount_jffs2(void) + return mtd_unlock(rootfs_data); + } + +-static int jffs2_ready(char *mtd) ++static int jffs2_ready(char *mtd, enum mtd_type type) + { + FILE *fp = fopen(mtd, "r"); + __u32 deadc0de; +@@ -298,16 +364,21 @@ static int jffs2_ready(char *mtd) + } + + deadc0de = __be32_to_cpu(deadc0de); +- jffs2 = __be16_to_cpu(deadc0de >> 16); ++ if (deadc0de == 0xdeadc0de) { ++ LOG("jffs2 is not ready - EOF marker found\n"); ++ return FS_DEADCODE; ++ } + ++ jffs2 = __be16_to_cpu(deadc0de >> 16); + if (jffs2 == 0x1985) { + LOG("jffs2 is ready\n"); + return FS_JFFS2; + } + +- if (deadc0de == 0xdeadc0de) { +- LOG("jffs2 is not ready - marker found\n"); +- return FS_DEADCODE; ++ if (type == MTD_TYPE_UBI && ++ deadc0de == 0xffffffff) { ++ LOG("jffs2 is ready\n"); ++ return FS_JFFS2; + } + + ERROR("No jffs2 marker was found\n"); +@@ -638,6 +709,7 @@ static int main_switch2jffs(int argc, ch + char mtd[32]; + char *mp; + int ret = -1; ++ enum mtd_type type; + + if (find_overlay_mount("overlayfs:/tmp/root")) + return -1; +@@ -659,7 +731,8 @@ static int main_switch2jffs(int argc, ch + return ret; + } + +- switch (jffs2_ready(mtd)) { ++ type = mtd_get_type_by_name("rootfs_data"); ++ switch (jffs2_ready(mtd, type)) { + case FS_NONE: + ERROR("no jffs2 marker found\n"); + /* fall through */ +@@ -781,12 +854,15 @@ int main(int argc, char **argv) + LOG("mounting /dev/root\n"); + mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0); + } else { ++ enum mtd_type type; ++ + if (!extroot("")) { + fprintf(stderr, "mount_root: switched to extroot\n"); + return 0; + } + +- switch (jffs2_ready(mtd)) { ++ type = mtd_get_type_by_name("rootfs_data"); ++ switch (jffs2_ready(mtd, type)) { + case FS_NONE: + case FS_DEADCODE: + return ramoverlay(); |