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

SVN-Revision: 12250

package/mtd/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=mtd
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_BUILD_DIR := $(KERNEL_BUILD_DIR)/$(PKG_NAME)
 

package/mtd/src/jffs2.c

@@ -14,7 +14,6 @@
 #define PAD(x) (((x)+3)&~3)
 
 #define CLEANMARKER "\x85\x19\x03\x20\x0c\x00\x00\x00\xb1\xb0\x1e\xe4"
-#define JFFS2_EOF "\xde\xad\xc0\xde"
 
 static int last_ino = 0;
 static int last_version = 0;
@@ -22,6 +21,7 @@ static char *buf = NULL;
 static int ofs = 0;
 static int outfd = 0;
 static int mtdofs = 0;
+static int target_ino = 0;
 
 static void prep_eraseblock(void);
 
@@ -65,7 +65,7 @@ static void prep_eraseblock(void)
 	add_data(CLEANMARKER, sizeof(CLEANMARKER) - 1);
 }
 
-static int add_dirent(char *name, char type, int parent)
+static int add_dirent(const char *name, const char type, int parent)
 {
 	struct jffs2_raw_dirent *de;
 
@@ -97,7 +97,7 @@ static int add_dirent(char *name, char type, int parent)
 	return de->ino;
 }
 
-static int add_dir(char *name, int parent)
+static int add_dir(const char *name, int parent)
 {
 	struct jffs2_raw_inode ri;
 	int inode;
@@ -128,12 +128,13 @@ static int add_dir(char *name, int parent)
 	return inode;
 }
 
-static void add_file(char *name, int parent)
+static void add_file(const char *name, int parent)
 {
 	int inode, f_offset = 0, fd;
 	struct jffs2_raw_inode ri;
 	struct stat st;
-	char wbuf[4096], *fname;
+	char wbuf[4096];
+	const char *fname;
 	FILE *f;
 
 	if (stat(name, &st)) {
@@ -204,9 +205,53 @@ static void add_file(char *name, int parent)
 	close(fd);
 }
 
-int mtd_write_jffs2(char *mtd, char *filename, char *dir)
+int mtd_replace_jffs2(int fd, int ofs, const char *filename)
+{
+	outfd = fd;
+	mtdofs = ofs;
+
+	buf = malloc(erasesize);
+	target_ino = 1;
+	if (!last_ino)
+		last_ino = 1;
+	add_file(filename, target_ino);
+	pad(erasesize);
+
+	/* add eof marker, pad to eraseblock size and write the data */
+	add_data(JFFS2_EOF, sizeof(JFFS2_EOF) - 1);
+	pad(erasesize);
+	free(buf);
+}
+
+void mtd_parse_jffs2data(const char *buf, const char *dir)
+{
+	struct jffs2_unknown_node *node = (struct jffs2_unknown_node *) buf;
+	unsigned int ofs = 0;
+
+	while (ofs < erasesize) {
+		node = (struct jffs2_unknown_node *) (buf + ofs);
+		if (node->magic != 0x1985)
+			break;
+
+		ofs += PAD(node->totlen);
+		if (node->nodetype == JFFS2_NODETYPE_DIRENT) {
+			struct jffs2_raw_dirent *de = (struct jffs2_raw_dirent *) node;
+
+			/* is this the right directory name and is it a subdirectory of / */
+			if (*dir && (de->pino == 1) && !strncmp(de->name, dir, de->nsize))
+				target_ino = de->ino;
+
+			/* store the last inode and version numbers for adding extra files */
+			if (last_ino < de->ino)
+				last_ino = de->ino;
+			if (last_version < de->version)
+				last_version = de->version;
+		}
+	}
+}
+
+int mtd_write_jffs2(const char *mtd, const char *filename, const char *dir)
 {
-	int target_ino = 0;
 	int err = -1, fdeof = 0;
 	off_t offset;
 
@@ -230,7 +275,6 @@ int mtd_write_jffs2(char *mtd, char *filename, char *dir)
 	 * locate the directory that the file is going to be placed in */
 	for(;;) {
 		struct jffs2_unknown_node *node = (struct jffs2_unknown_node *) buf;
-		unsigned int ofs = 0;
 
 		if (read(outfd, buf, erasesize) != erasesize) {
 			fdeof = 1;
@@ -248,27 +292,7 @@ int mtd_write_jffs2(char *mtd, char *filename, char *dir)
 		if (node->magic != 0x1985)
 			break;
 
-		while (ofs < erasesize) {
-			node = (struct jffs2_unknown_node *) (buf + ofs);
-			if (node->magic == 0x1985) {
-				ofs += PAD(node->totlen);
-				if (node->nodetype == JFFS2_NODETYPE_DIRENT) {
-					struct jffs2_raw_dirent *de = (struct jffs2_raw_dirent *) node;
-					
-					/* is this the right directory name and is it a subdirectory of / */
-					if (*dir && (de->pino == 1) && !strncmp(de->name, dir, de->nsize))
-						target_ino = de->ino;
-
-					/* store the last inode and version numbers for adding extra files */
-					if (last_ino < de->ino)
-						last_ino = de->ino;
-					if (last_version < de->version)
-						last_version = de->version;
-				}
-			} else {
-				ofs = ~0;
-			}
-		}
+		mtd_parse_jffs2data(buf, dir);
 	}
 
 	if (fdeof) {

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)
 			}
 		}
 	
-		/* 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);
 		}
+		/* check trx file before erasing or writing anything */
+		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;

package/mtd/src/mtd.h

@@ -1,14 +1,18 @@
 #ifndef __mtd_h
 #define __mtd_h
 
+#define JFFS2_EOF "\xde\xad\xc0\xde"
+
 extern int quiet;
 extern int mtdsize;
 extern int erasesize;
 
 extern int mtd_open(const char *mtd);
-extern int mtd_check_open(char *mtd);
+extern int mtd_check_open(const char *mtd);
 extern int mtd_erase_block(int fd, int offset);
-extern int mtd_write_buffer(int fd, char *buf, int offset, int length);
-extern int mtd_write_jffs2(char *mtd, char *filename, char *dir);
+extern int mtd_write_buffer(int fd, const char *buf, int offset, int length);
+extern int mtd_write_jffs2(const char *mtd, const char *filename, const char *dir);
+extern int mtd_replace_jffs2(int fd, int ofs, const char *filename);
+extern void mtd_parse_jffs2data(const char *buf, const char *dir);
 
 #endif /* __mtd_h */