add support for appending a file to jffs2 during reflash on the fly

[openwrt.git] / package / mtd / src / mtd.c

diff --git a/package/mtd/src/mtd.c b/package/mtd/src/mtd.c
index f3a13ef..027c859 100644 (file)
--- a/package/mtd/src/mtd.c
+++ b/package/mtd/src/mtd.c
@@ -43,11 +43,10 @@
 #include <sys/stat.h>
 #include <sys/reboot.h>
 #include <linux/reboot.h>
-
 #include "mtd-api.h"
+#include "mtd.h"
 
 #define TRX_MAGIC       0x30524448      /* "HDR0" */
-#define BUFSIZE (16 * 1024)
 #define MAX_ARGS 8
 
 #define DEBUG
@@ -66,9 +65,10 @@ struct trx_header {
        uint32_t offsets[3];    /* Offsets of partitions from start of header */
 };
 
-static char buf[BUFSIZE];
-static char *imagefile;
-static int buflen;
+static char *buf = NULL;
+static char *imagefile = NULL;
+static char *jffs2file = NULL, *jffs2dir = JFFS2_DEFAULT_DIR;
+static int buflen = 0;
 int quiet;
 int mtdsize = 0;
 int erasesize = 0;
@@ -134,7 +134,7 @@ int mtd_erase_block(int fd, int offset)
        }
 }
 
-int mtd_write_buffer(int fd, char *buf, int offset, int length)
+int mtd_write_buffer(int fd, const char *buf, int offset, int length)
 {
        lseek(fd, offset, SEEK_SET);
        write(fd, buf, length);
@@ -205,6 +205,9 @@ static int mtd_check(const char *mtd)
        if (!fd)
                return 0;
 
+       if (!buf)
+               buf = malloc(erasesize);
+
        close(fd);
        return 1;
 }
@@ -316,15 +319,29 @@ mtd_write(int imagefd, const char *mtd)
 
        for (;;) {
                /* buffer may contain data already (from trx check) */
-               r = buflen;
-               r += read(imagefd, buf + buflen, BUFSIZE - buflen);
-               w += r;
+               r = read(imagefd, buf + buflen, erasesize - buflen);
+               if (r < 0)
+                       break;
 
-               /* EOF */
-               if (r <= 0) break;
+               buflen += r;
+
+               if (jffs2file) {
+                       if (memcmp(buf, JFFS2_EOF, sizeof(JFFS2_EOF)) == 0) {
+                               if (!quiet)
+                                       fprintf(stderr, "\b\b\b   ");
+                               if (quiet < 2)
+                                       fprintf(stderr, "\nAppending jffs2 data to from %s to %s...", jffs2file, mtd);
+                               /* got an EOF marker - this is the place to add some jffs2 data */
+                               mtd_replace_jffs2(fd, e, jffs2file);
+                               goto done;
+                       }
+                       /* no EOF marker, make sure we figure out the last inode number
+                        * before appending some data */
+                       mtd_parse_jffs2data(buf, jffs2dir);
+               }
 
                /* need to erase the next block before writing data to it */
-               while (w > e) {
+               while (w + buflen > e) {
                        if (!quiet)
                                fprintf(stderr, "\b\b\b[e]");
 
@@ -337,7 +354,7 @@ mtd_write(int imagefd, const char *mtd)
                if (!quiet)
                        fprintf(stderr, "\b\b\b[w]");
                
-               if ((result = write(fd, buf, r)) < r) {
+               if ((result = write(fd, buf, buflen)) < buflen) {
                        if (result < 0) {
                                fprintf(stderr, "Error writing image.\n");
                                exit(1);
@@ -346,12 +363,18 @@ mtd_write(int imagefd, const char *mtd)
                                exit(1);
                        }
                }
-               
+               w += buflen;
+
+               /* not enough data - eof */
+               if (buflen < erasesize)
+                       break;
+
                buflen = 0;
        }
        if (!quiet)
                fprintf(stderr, "\b\b\b\b");
 
+done:
        if (quiet < 2)
                fprintf(stderr, "\n");
 
@@ -376,6 +399,7 @@ static void usage(void)
        "        -f                      force write without trx checks\n"
        "        -e <device>             erase <device> before executing the command\n"
        "        -d <name>               directory for jffs2write, defaults to \"tmp\"\n"
+       "        -j <name>               integrate <file> into jffs2 data when writing an image\n"
        "\n"
        "Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards\n"
        "         mtd -r write linux.trx linux\n\n");
@@ -399,7 +423,6 @@ int main (int argc, char **argv)
 {
        int ch, i, boot, unlock, imagefd, force, unlocked;
        char *erase[MAX_ARGS], *device;
-       char *jffs2dir = JFFS2_DEFAULT_DIR;
        enum {
                CMD_ERASE,
                CMD_WRITE,
@@ -414,7 +437,7 @@ int main (int argc, char **argv)
        buflen = 0;
        quiet = 0;
 
-       while ((ch = getopt(argc, argv, "frqe:d:")) != -1)
+       while ((ch = getopt(argc, argv, "frqe:d:j:")) != -1)
                switch (ch) {
                        case 'f':
                                force = 1;
@@ -422,6 +445,9 @@ int main (int argc, char **argv)
                        case 'r':
                                boot = 1;
                                break;
+                       case 'j':
+                               jffs2file = optarg;
+                               break;
                        case 'q':
                                quiet++;
                                break;
@@ -470,17 +496,14 @@ int main (int argc, char **argv)
                        }
                }
        
+               if (!mtd_check(device)) {
+                       fprintf(stderr, "Can't open device for writing!\n");
+                       exit(1);
+               }
                /* check trx file before erasing or writing anything */
-               if (!image_check(imagefd, device)) {
-                       if (!force) {
-                               fprintf(stderr, "Image check failed.\n");
-                               exit(1);
-                       }
-               } else {
-                       if (!mtd_check(device)) {
-                               fprintf(stderr, "Can't open device for writing!\n");
-                               exit(1);
-                       }
+               if (!image_check(imagefd, device) && !force) {
+                       fprintf(stderr, "Image check failed.\n");
+                       exit(1);
                }
        } else if ((strcmp(argv[0], "jffs2write") == 0) && (argc == 3)) {
                cmd = CMD_JFFS2WRITE;