diff options
Diffstat (limited to 'mkfs.jffs.c')
-rw-r--r-- | mkfs.jffs.c | 739 |
1 files changed, 739 insertions, 0 deletions
diff --git a/mkfs.jffs.c b/mkfs.jffs.c new file mode 100644 index 0000000..942a093 --- /dev/null +++ b/mkfs.jffs.c @@ -0,0 +1,739 @@ +/* + * Build a JFFS image in a file, from a given directory tree. + * + * By default, builds an image that is of the same endianness as the + * host. + * The -a option can be used when building for a target system which + * has a different endianness than the host. + */ + +/* $Id: mkfs.jffs.c,v 1.15 2005/11/07 11:15:13 gleixner Exp $ */ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <dirent.h> +#include <unistd.h> +#include <linux/types.h> +#include <asm/byteorder.h> +#include <ctype.h> + +#define swab16(x) \ + ((__u16)( \ + (((__u16)(x) & (__u16)0x00ffU) << 8) | \ + (((__u16)(x) & (__u16)0xff00U) >> 8) )) +#define swab32(x) \ + ((__u32)( \ + (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ + (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ + (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ + (((__u32)(x) & (__u32)0xff000000UL) >> 24) )) + +#if __BYTE_ORDER == __BIG_ENDIAN +#define cpu_to_le16(x) ({ __u16 _x = x; swab16(_x); }) +#define cpu_to_le32(x) ({ __u32 _x = x; swab32(_x); }) +#define cpu_to_be16(x) (x) +#define cpu_to_be32(x) (x) +#else +#define cpu_to_le16(x) (x) +#define cpu_to_le32(x) (x) +#define cpu_to_be16(x) ({ __u16 _x = x; swab16(_x); }) +#define cpu_to_be32(x) ({ __u32 _x = x; swab32(_x); }) +#endif +#define le32_to_cpu(x) cpu_to_le32(x) +#define be32_to_cpu(x) cpu_to_be32(x) + +#define BLOCK_SIZE 1024 +#define JFFS_MAGIC 0x34383931 /* "1984" */ +#define JFFS_MAX_NAME_LEN 256 +#define JFFS_MIN_INO 1 +#define JFFS_TRACE_INDENT 4 +#define JFFS_ALIGN_SIZE 4 +static int MAX_CHUNK_SIZE = 32768; + +/* How many padding bytes should be inserted between two chunks of data + on the flash? */ +#define JFFS_GET_PAD_BYTES(size) ((JFFS_ALIGN_SIZE \ + - ((__u32)(size) % JFFS_ALIGN_SIZE)) \ + % JFFS_ALIGN_SIZE) + + +struct jffs_raw_inode +{ + __u32 magic; /* A constant magic number. */ + __u32 ino; /* Inode number. */ + __u32 pino; /* Parent's inode number. */ + __u32 version; /* Version number. */ + __u32 mode; /* file_type, mode */ + __u16 uid; + __u16 gid; + __u32 atime; + __u32 mtime; + __u32 ctime; + __u32 offset; /* Where to begin to write. */ + __u32 dsize; /* Size of the file data. */ + __u32 rsize; /* How much are going to be replaced? */ + __u8 nsize; /* Name length. */ + __u8 nlink; /* Number of links. */ + __u8 spare : 6; /* For future use. */ + __u8 rename : 1; /* Is this a special rename? */ + __u8 deleted : 1; /* Has this file been deleted? */ + __u8 accurate; /* The inode is obsolete if accurate == 0. */ + __u32 dchksum; /* Checksum for the data. */ + __u16 nchksum; /* Checksum for the name. */ + __u16 chksum; /* Checksum for the raw_inode. */ +}; + + +struct jffs_file +{ + struct jffs_raw_inode inode; + char *name; + unsigned char *data; +}; + + +char *root_directory_name = NULL; +int fs_pos = 0; +int verbose = 0; + +#define ENDIAN_HOST 0 +#define ENDIAN_BIG 1 +#define ENDIAN_LITTLE 2 +int endian = ENDIAN_HOST; + +static __u32 jffs_checksum(void *data, int size); +void jffs_print_trace(const char *path, int depth); +int make_root_dir(FILE *fs, int first_ino, const char *root_dir_path, + int depth); +void write_file(struct jffs_file *f, FILE *fs, struct stat st); +void read_data(struct jffs_file *f, const char *path, int offset); +int mkfs(FILE *fs, const char *path, int ino, int parent, int depth); + + +static __u32 +jffs_checksum(void *data, int size) +{ + __u32 sum = 0; + __u8 *ptr = (__u8 *)data; + + while (size-- > 0) + { + sum += *ptr++; + } + + return sum; +} + + +void +jffs_print_trace(const char *path, int depth) +{ + int path_len = strlen(path); + int out_pos = depth * JFFS_TRACE_INDENT; + int pos = path_len - 1; + char *out = (char *)alloca(depth * JFFS_TRACE_INDENT + path_len + 1); + + if (verbose >= 2) + { + fprintf(stderr, "jffs_print_trace(): path: \"%s\"\n", path); + } + + if (!out) { + fprintf(stderr, "jffs_print_trace(): Allocation failed.\n"); + fprintf(stderr, " path: \"%s\"\n", path); + fprintf(stderr, "depth: %d\n", depth); + exit(1); + } + + memset(out, ' ', depth * JFFS_TRACE_INDENT); + + if (path[pos] == '/') + { + pos--; + } + while (path[pos] && (path[pos] != '/')) + { + pos--; + } + for (pos++; path[pos] && (path[pos] != '/'); pos++) + { + out[out_pos++] = path[pos]; + } + out[out_pos] = '\0'; + fprintf(stderr, "%s\n", out); +} + + +/* Print the contents of a raw inode. */ +void +jffs_print_raw_inode(struct jffs_raw_inode *raw_inode) +{ + fprintf(stderr, "jffs_raw_inode: inode number: %u\n", raw_inode->ino); + fprintf(stderr, "{\n"); + fprintf(stderr, " 0x%08x, /* magic */\n", raw_inode->magic); + fprintf(stderr, " 0x%08x, /* ino */\n", raw_inode->ino); + fprintf(stderr, " 0x%08x, /* pino */\n", raw_inode->pino); + fprintf(stderr, " 0x%08x, /* version */\n", raw_inode->version); + fprintf(stderr, " 0x%08x, /* mode */\n", raw_inode->mode); + fprintf(stderr, " 0x%04x, /* uid */\n", raw_inode->uid); + fprintf(stderr, " 0x%04x, /* gid */\n", raw_inode->gid); + fprintf(stderr, " 0x%08x, /* atime */\n", raw_inode->atime); + fprintf(stderr, " 0x%08x, /* mtime */\n", raw_inode->mtime); + fprintf(stderr, " 0x%08x, /* ctime */\n", raw_inode->ctime); + fprintf(stderr, " 0x%08x, /* offset */\n", raw_inode->offset); + fprintf(stderr, " 0x%08x, /* dsize */\n", raw_inode->dsize); + fprintf(stderr, " 0x%08x, /* rsize */\n", raw_inode->rsize); + fprintf(stderr, " 0x%02x, /* nsize */\n", raw_inode->nsize); + fprintf(stderr, " 0x%02x, /* nlink */\n", raw_inode->nlink); + fprintf(stderr, " 0x%02x, /* spare */\n", + raw_inode->spare); + fprintf(stderr, " %u, /* rename */\n", + raw_inode->rename); + fprintf(stderr, " %u, /* deleted */\n", + raw_inode->deleted); + fprintf(stderr, " 0x%02x, /* accurate */\n", + raw_inode->accurate); + fprintf(stderr, " 0x%08x, /* dchksum */\n", raw_inode->dchksum); + fprintf(stderr, " 0x%04x, /* nchksum */\n", raw_inode->nchksum); + fprintf(stderr, " 0x%04x, /* chksum */\n", raw_inode->chksum); + fprintf(stderr, "}\n"); +} + +static void write_val32(__u32 *adr, __u32 val) +{ + switch(endian) { + case ENDIAN_HOST: + *adr = val; + break; + case ENDIAN_LITTLE: + *adr = cpu_to_le32(val); + break; + case ENDIAN_BIG: + *adr = cpu_to_be32(val); + break; + } +} + +static void write_val16(__u16 *adr, __u16 val) +{ + switch(endian) { + case ENDIAN_HOST: + *adr = val; + break; + case ENDIAN_LITTLE: + *adr = cpu_to_le16(val); + break; + case ENDIAN_BIG: + *adr = cpu_to_be16(val); + break; + } +} + +static __u32 read_val32(__u32 *adr) +{ + __u32 val = 0; + + switch(endian) { + case ENDIAN_HOST: + val = *adr; + break; + case ENDIAN_LITTLE: + val = le32_to_cpu(*adr); + break; + case ENDIAN_BIG: + val = be32_to_cpu(*adr); + break; + } + return val; +} + + +/* This function constructs a root inode with no name and + no data. The inode is then written to the filesystem + image. */ +int +make_root_dir(FILE *fs, int first_ino, const char *root_dir_path, int depth) +{ + struct jffs_file f; + struct stat st; + + if (stat(root_dir_path, &st) < 0) + { + perror("stat"); + exit(1); + } + + write_val32(&f.inode.magic, JFFS_MAGIC); + write_val32(&f.inode.ino, first_ino); + write_val32(&f.inode.pino, 0); + write_val32(&f.inode.version, 1); + write_val32(&f.inode.mode, st.st_mode); + write_val16(&f.inode.uid, 0); /* root */ + write_val16(&f.inode.gid, 0); /* root */ + write_val32(&f.inode.atime, st.st_atime); + write_val32(&f.inode.mtime, st.st_mtime); + write_val32(&f.inode.ctime, st.st_ctime); + write_val32(&f.inode.offset, 0); + write_val32(&f.inode.dsize, 0); + write_val32(&f.inode.rsize,0); + f.inode.nsize = 0; + /*f.inode.nlink = st.st_nlink;*/ + f.inode.nlink = 1; + f.inode.spare = 0; + f.inode.rename = 0; + f.inode.deleted = 0; + f.inode.accurate = 0; + write_val32(&f.inode.dchksum, 0); + write_val16(&f.inode.nchksum, 0); + write_val16(&f.inode.chksum, 0); + f.name = 0; + f.data = 0; + write_val16(&f.inode.chksum, jffs_checksum(&f.inode, sizeof(struct jffs_raw_inode))); + f.inode.accurate = 0xff; + write_file(&f, fs, st); + if (verbose >= 1) + { + jffs_print_trace(root_dir_path, depth); + } + if (verbose >= 2) + { + jffs_print_raw_inode(&f.inode); + } + return first_ino; +} + + +/* This function writes a chunks of data. A data chunk consists of a + raw inode, perhaps a name and perhaps some data. */ +void +write_file(struct jffs_file *f, FILE *fs, struct stat st) +{ + int npad = JFFS_GET_PAD_BYTES(f->inode.nsize); + int dpad = JFFS_GET_PAD_BYTES(read_val32(&f->inode.dsize)); + int size = sizeof(struct jffs_raw_inode) + f->inode.nsize + npad + + read_val32(&f->inode.dsize) + dpad; + unsigned char ff_data[] = { 0xff, 0xff, 0xff, 0xff }; + + if (verbose >= 2) + { + fprintf(stderr, "***write_file()\n"); + } + + /* Write the raw inode. */ + fwrite((void *)&f->inode, sizeof(struct jffs_raw_inode), 1, fs); + + /* Write the name. */ + if (f->inode.nsize) + { + fwrite(f->name, 1, f->inode.nsize, fs); + if (npad) + { + fwrite(ff_data, 1, npad, fs); + } + } + + /* Write the data. */ + if (read_val32(&f->inode.dsize)) + { + if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) + { + __u16 tmp; + + switch(endian) { + case ENDIAN_HOST: + tmp = st.st_rdev; + break; + case ENDIAN_LITTLE: + tmp = cpu_to_le16(st.st_rdev); + break; + case ENDIAN_BIG: + tmp = cpu_to_be16(st.st_rdev); + break; + } + fwrite((char *)&tmp, sizeof(st.st_rdev) / 4, 1, fs); + } + else + { + fwrite(f->data, 1, read_val32(&f->inode.dsize), fs); + } + if (dpad) + { + fwrite(ff_data, 1, dpad, fs); + } + } + + fs_pos += size; + /* If the space left on the block is smaller than the size of an + inode, then skip it. */ +} + + +void +read_data(struct jffs_file *f, const char *path, int offset) +{ + FILE *file; + char *tot_path; + int pos = 0; + int r; + + if (verbose >= 2) + { + fprintf(stderr, "***read_data(): f: 0x%08x, path: \"%s\", offset: %u\r\n", + (unsigned int)f, path, offset); + fprintf(stderr, " file's size: %u\n", read_val32(&f->inode.dsize)); + } + + if (!(f->data = (unsigned char *)malloc(read_val32(&f->inode.dsize)))) + { + fprintf(stderr, "read_data(): malloc() failed! (*data)\n"); + exit(1); + } + + if (!(tot_path = (char *)alloca(strlen(path) + f->inode.nsize + 1))) + { + fprintf(stderr, "read_data(): alloca() failed! (tot_path)\n"); + exit(1); + } + strcpy(tot_path, path); + strncat(tot_path, f->name, f->inode.nsize); + + if (!(file = fopen(tot_path, "r"))) + { + fprintf(stderr, "read_data(): Couldn't open \"%s\".\n", tot_path); + exit(1); + } + + if (fseek(file, offset, SEEK_SET) < 0) + { + fprintf(stderr, "read_data(): fseek failure: path = %s, offset = %u.\n", + path, offset); + exit(1); + } + + while (pos < read_val32(&f->inode.dsize)) + { + if ((r = fread(&f->data[pos], 1, read_val32(&f->inode.dsize) - pos, file)) < 0) + { + fprintf(stderr, "read_data(): fread failure (%s).\n", path); + exit(1); + } + pos += r; + } + + fclose(file); +} + + +/* This is the routine that constructs the filesystem image. */ +int +mkfs(FILE *fs, const char *path, int ino, int parent, int depth) +{ + struct dirent *dir_entry; + DIR *dir; + struct stat st; + struct jffs_file f; + int name_len; + int pos = 0; + int new_ino = ino; + char *filename; + int path_len = strlen(path); + + if (verbose >= 2) + { + fprintf(stderr, "***mkfs(): path: \"%s\"\r\n", path); + } + + if (!(dir = opendir(path))) + { + perror("opendir"); + fprintf(stderr, "mkfs(): opendir() failed! (%s)\n", path); + exit(1); + } + + while ((dir_entry = readdir(dir))) + { + if (verbose >= 2) + { + fprintf(stderr, "mkfs(): name: %s\n", dir_entry->d_name); + } + name_len = strlen(dir_entry->d_name); + + if (((name_len == 1) + && (dir_entry->d_name[0] == '.')) + || ((name_len == 2) + && (dir_entry->d_name[0] == '.') + && (dir_entry->d_name[1] == '.'))) + { + continue; + } + + if (!(filename = (char *)alloca(path_len + name_len + 1))) + { + fprintf(stderr, "mkfs(): Allocation failed!\n"); + exit(0); + } + strcpy(filename, path); + strcat(filename, dir_entry->d_name); + + if (verbose >= 2) + { + fprintf(stderr, "mkfs(): filename: %s\n", filename); + } + + if (lstat(filename, &st) < 0) + { + perror("lstat"); + exit(1); + } + + if (verbose >= 2) + { + fprintf(stderr, "mkfs(): filename: \"%s\", ino: %d, parent: %d\n", + filename, new_ino, parent); + } + + write_val32(&f.inode.magic, JFFS_MAGIC); + write_val32(&f.inode.ino, new_ino); + write_val32(&f.inode.pino, parent); + write_val32(&f.inode.version, 1); + write_val32(&f.inode.mode, st.st_mode); + write_val16(&f.inode.uid, st.st_uid); + write_val16(&f.inode.gid, st.st_gid); + write_val32(&f.inode.atime, st.st_atime); + write_val32(&f.inode.mtime, st.st_mtime); + write_val32(&f.inode.ctime, st.st_ctime); + write_val32(&f.inode.dsize, 0); + write_val32(&f.inode.rsize, 0); + f.inode.nsize = name_len; + /*f.inode.nlink = st.st_nlink;*/ + f.inode.nlink = 1; + f.inode.spare = 0; + f.inode.rename = 0; + f.inode.deleted = 0; + f.inode.accurate = 0; + write_val32(&f.inode.dchksum, 0); + write_val16(&f.inode.nchksum, 0); + write_val16(&f.inode.chksum, 0); + if (dir_entry->d_name) + { + f.name = strdup(dir_entry->d_name); + } + else + { + f.name = 0; + } + + repeat: + write_val32(&f.inode.offset, pos); + f.data = 0; + f.inode.accurate = 0; + if (S_ISREG(st.st_mode) && st.st_size) + { + if (st.st_size - pos < MAX_CHUNK_SIZE) + { + write_val32(&f.inode.dsize, st.st_size - pos); + } + else + { + write_val32(&f.inode.dsize, MAX_CHUNK_SIZE); + } + + read_data(&f, path, pos); + pos += read_val32(&f.inode.dsize); + } + else if (S_ISLNK(st.st_mode)) + { + int linklen; + char *linkdata = malloc(1000); + if (!linkdata) + { + fprintf(stderr, "mkfs(): malloc() failed! (linkdata)\n"); + exit(1); + } + if ((linklen = readlink(filename, linkdata, 1000)) < 0) + { + free(linkdata); + fprintf(stderr, "mkfs(): readlink() failed! f.name = \"%s\"\n", + f.name); + exit(1); + } + + write_val32(&f.inode.dsize, linklen); + f.data = (unsigned char *)linkdata; + f.data[linklen] = '\0'; + } + else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) + { + write_val32(&f.inode.dsize, sizeof(st.st_rdev) / 4); + } + + write_val16(&f.inode.chksum, 0); + if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) + { + write_val32(&f.inode.dchksum, jffs_checksum((void *)f.data, read_val32(&f.inode.dsize))); + } + else + { + write_val32(&f.inode.dchksum, jffs_checksum((void *)&st.st_rdev, sizeof(st.st_rdev) / 4)); + } + + write_val16(&f.inode.nchksum, jffs_checksum((void *)f.name, f.inode.nsize)); + write_val16(&f.inode.chksum, jffs_checksum((void *)&f.inode, sizeof(struct jffs_raw_inode))); + f.inode.accurate = 0xff; + + write_file(&f, fs, st); + if (S_ISREG(st.st_mode) && st.st_size) + { + if (pos < st.st_size) + { + write_val32(&f.inode.version, read_val32(&f.inode.version) + 1); + goto repeat; + } + } + + new_ino++; + pos = 0; + if (verbose >= 1) + { + jffs_print_trace(f.name, depth); + } + if (verbose >= 2) + { + jffs_print_raw_inode(&f.inode); + } + + if (S_ISDIR(st.st_mode)) + { + char *new_path; + + if (!(new_path = (char *)alloca(strlen(path) + name_len + 1 + 1))) + { + fprintf(stderr, "mkfs(): alloca() failed! (new_path)\n"); + exit(1); + } + strcpy(new_path, path); + strncat(new_path, f.name, f.inode.nsize); + strcat(new_path, "/"); + + if (verbose >= 2) + { + fprintf(stderr, "mkfs(): new_path: \"%s\"\n", new_path); + } + new_ino = mkfs(fs, new_path, new_ino, new_ino - 1, depth + 1); + } + if (f.name) + { + free(f.name); + } + if (f.data) + { + free(f.data); + } + } + + closedir(dir); + return new_ino; +} + + +void +usage(void) +{ + fprintf(stderr, "Usage: mkfs.jffs -d root_directory [-a little|big] [-e erase_size] [-o output_file] [-v[0-9]]\n"); + fprintf(stderr, " By default, the file system is built using the same endianness as the\n"); + fprintf(stderr, " host. If building for a different target, use the -a option.\n"); +} + + +int +main(int argc, char **argv) +{ + FILE *fs; + int root_ino; + int len; + int ch; + extern int optind; + extern char *optarg; + + fs = stdout; /* Send constructed file system to stdout by default */ + + while ((ch = getopt(argc, argv, "a:d:e:v::o:h?")) != -1) { + switch((char)ch) { + case 'd': + len = strlen(optarg); + root_directory_name = (char *)malloc(len + 2); + memcpy(root_directory_name, optarg, len); + if (root_directory_name[len - 1] != '/') + { + root_directory_name[len++] = '/'; + } + root_directory_name[len] = '\0'; + break; + case 'v': + if (!optarg || strlen(optarg) == 0) { + verbose = 1; + } + else if (strlen(optarg) > 1 || !isdigit(optarg[0])) { + fprintf(stderr, "verbose level must be between 0 and 9!\n"); + usage(); + exit(1); + } + else { + verbose = strtol(optarg, NULL, 0); + } + break; + case 'o': + fs = fopen(optarg, "w"); + if (!fs) { + fprintf(stderr, "unable to open file %s for output.\n", optarg); + exit(1); + } + break; + case 'a': + if (strcmp(optarg, "little") == 0) { + endian = ENDIAN_LITTLE; + } + else if (strcmp(optarg, "big") == 0) { + endian = ENDIAN_BIG; + } + else { + usage(); + exit(1); + } + break; + case 'e': + MAX_CHUNK_SIZE = strtol(optarg, NULL, 0) / 2; + break; + case 'h': + case '?': + default: + usage(); + exit(0); + } + } + + if ((argc -= optind)) { + usage(); + exit(1); + } + + if (root_directory_name == NULL) { + fprintf(stderr, "Error: must specify a root directory\n"); + usage(); + exit(1); + } + + if (verbose >= 1) + { + fprintf(stderr, "Constructing JFFS filesystem...\n"); + } + root_ino = make_root_dir(fs, JFFS_MIN_INO, root_directory_name, 0); + mkfs(fs, root_directory_name, root_ino + 1, root_ino, 1); + + fclose(fs); + free(root_directory_name); + exit(0); +} |