[PATCH v2 2/2] mtd-utils: nanddump: add 64-bit support, utilize libmtd

["Brian Norris" <computersforpeace@gmail.com>]

Adds support for 64-bit offsets (i.e., devices larger than 4GB).
Utilizes the "unsigned long long" data type as the standard type
for 64-bit offsets throughout. Reformats a few printf statements
to avoid casting and to properly handle "long long."

Calls to ioctls are mostly replaced by libmtd interfaces (which should
choose the proper ioctls for us); however, a few remain and probably
should be handled with more robust interfaces, as some of these
ioctls are considered "legacy."

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
 nanddump.c |   83 +++++++++++++++++++++++++++++-------------------------------
 1 files changed, 40 insertions(+), 43 deletions(-)

diff --git a/nanddump.c b/nanddump.c
index 013eca0..86a71c9 100644
--- a/nanddump.c
+++ b/nanddump.c
@@ -33,6 +33,7 @@
 #include <asm/types.h>
 #include <mtd/mtd-user.h>
 #include "common.h"
+#include <libmtd.h>
 
 static struct nand_oobinfo none_oobinfo = {
 	.useecc = MTD_NANDECC_OFF,
@@ -81,7 +82,7 @@ static bool			pretty_print = false;	// print nice
 static bool			noecc = false;		// don't error correct
 static bool			noskipbad = false;	// don't skip bad blocks
 static bool			omitoob = false;	// omit oob data
-static unsigned long		start_addr;		// start address
+static unsigned long long	start_addr;		// start address
 static unsigned long		length;			// dump length
 static const char		*mtddev;		// mtd device name
 static const char		*dumpfile;		// dump file name
@@ -135,7 +136,7 @@ static void process_options(int argc, char * const argv[])
 				omitbad = true;
 				break;
 			case 's':
-				start_addr = strtoul(optarg, NULL, 0);
+				start_addr = strtoull(optarg, NULL, 0);
 				break;
 			case 'f':
 				if (!(dumpfile = strdup(optarg))) {
@@ -144,7 +145,7 @@ static void process_options(int argc, char * const argv[])
 				}
 				break;
 			case 'l':
-				length = strtoul(optarg, NULL, 0);
+				length = strtoull(optarg, NULL, 0);
 				break;
 			case 'o':
 				omitoob = true;
@@ -221,14 +222,14 @@ static void process_options(int argc, char * const argv[])
  */
 static void pretty_dump_to_buffer(const unsigned char *buf, size_t len,
 		char *linebuf, size_t linebuflen, bool pagedump, bool ascii,
-		unsigned int prefix)
+		unsigned long long prefix)
 {
 	static const char hex_asc[] = "0123456789abcdef";
 	unsigned char ch;
 	unsigned int j, lx = 0, ascii_column;
 
 	if (pagedump)
-		lx += sprintf(linebuf, "0x%.8x: ", prefix);
+		lx += sprintf(linebuf, "0x%.8llx: ", prefix);
 	else
 		lx += sprintf(linebuf, "  OOB Data: ");
 
@@ -271,20 +272,25 @@ nil:
  */
 int main(int argc, char * const argv[])
 {
-	unsigned long ofs, end_addr = 0;
+	unsigned long long ofs, end_addr = 0;
 	unsigned long long blockstart = 1;
 	int ret, i, fd, ofd = 0, bs, badblock = 0;
-	struct mtd_oob_buf oob;
-	mtd_info_t meminfo;
+	struct mtd_dev_info mtd;
 	char pretty_buf[PRETTY_BUF_LEN];
 	int oobinfochanged = 0, firstblock = 1;
 	struct nand_oobinfo old_oobinfo;
 	struct mtd_ecc_stats stat1, stat2;
 	bool eccstats = false;
 	unsigned char *readbuf = NULL, *oobbuf = NULL;
+	libmtd_t mtd_desc;
 
 	process_options(argc, argv);
 
+	/* Initialize libmtd */
+	mtd_desc = libmtd_open();
+	if (!mtd_desc)
+		return errmsg("can't initialize libmtd");
+
 	/* Open MTD device */
 	if ((fd = open(mtddev, O_RDONLY)) == -1) {
 		perror(mtddev);
@@ -292,20 +298,12 @@ int main(int argc, char * const argv[])
 	}
 
 	/* Fill in MTD device capability structure */
-	if (ioctl(fd, MEMGETINFO, &meminfo) != 0) {
-		perror("MEMGETINFO");
-		close(fd);
-		exit(EXIT_FAILURE);
-	}
+	if (mtd_get_dev_info(mtd_desc, mtddev, &mtd) < 0)
+		return errmsg("mtd_get_dev_info failed");
 
 	/* Allocate buffers */
-	oobbuf = xmalloc(sizeof(oobbuf) * meminfo.oobsize);
-	readbuf = xmalloc(sizeof(readbuf) * meminfo.writesize);
-
-	/* Fill in oob info */
-	oob.start = 0;
-	oob.length = meminfo.oobsize;
-	oob.ptr = oobbuf;
+	oobbuf = xmalloc(sizeof(oobbuf) * mtd.oob_size);
+	readbuf = xmalloc(sizeof(readbuf) * mtd.min_io_size);
 
 	if (noecc)  {
 		ret = ioctl(fd, MTDFILEMODE, MTD_MODE_RAW);
@@ -359,27 +357,27 @@ int main(int argc, char * const argv[])
 	}
 
 	/* Initialize start/end addresses and block size */
-	if (start_addr & (meminfo.writesize - 1)) {
+	if (start_addr & (mtd.min_io_size - 1)) {
 		fprintf(stderr, "WARNING: The start address is not page-aligned !\n"
 				"The pagesize of this NAND Flash is 0x%x.\n"
 				"nandwrite doesn't allow writes starting at this location.\n"
 				"Future versions of nanddump will fail here.\n",
-				meminfo.writesize);
+				mtd.min_io_size);
 	}
 	if (length)
 		end_addr = start_addr + length;
-	if (!length || end_addr > meminfo.size)
-		end_addr = meminfo.size;
+	if (!length || end_addr > mtd.size)
+		end_addr = mtd.size;
 
-	bs = meminfo.writesize;
+	bs = mtd.min_io_size;
 
 	/* Print informative message */
 	if (!quiet) {
 		fprintf(stderr, "Block size %u, page size %u, OOB size %u\n",
-				meminfo.erasesize, meminfo.writesize, meminfo.oobsize);
+				mtd.eb_size, mtd.min_io_size, mtd.oob_size);
 		fprintf(stderr,
-				"Dumping data starting at 0x%08x and ending at 0x%08x...\n",
-				(unsigned int)start_addr, (unsigned int)end_addr);
+				"Dumping data starting at 0x%08llx and ending at 0x%08llx...\n",
+				start_addr, end_addr);
 	}
 
 	/* Dump the flash contents */
@@ -387,12 +385,12 @@ int main(int argc, char * const argv[])
 		/* Check for bad block */
 		if (noskipbad) {
 			badblock = 0;
-		} else if (blockstart != (ofs & (~meminfo.erasesize + 1)) ||
+		} else if (blockstart != (ofs & (~mtd.eb_size + 1)) ||
 				firstblock) {
-			blockstart = ofs & (~meminfo.erasesize + 1);
+			blockstart = ofs & (~mtd.eb_size + 1);
 			firstblock = 0;
-			if ((badblock = ioctl(fd, MEMGETBADBLOCK, &blockstart)) < 0) {
-				perror("ioctl(MEMGETBADBLOCK)");
+			if ((badblock = mtd_is_bad(&mtd, fd, ofs / mtd.eb_size)) < 0) {
+				errmsg("libmtd: mtd_is_bad");
 				goto closeall;
 			}
 		}
@@ -403,8 +401,8 @@ int main(int argc, char * const argv[])
 			memset(readbuf, 0xff, bs);
 		} else {
 			/* Read page data and exit on failure */
-			if (pread(fd, readbuf, bs, ofs) != bs) {
-				perror("pread");
+			if (mtd_read(&mtd, fd, ofs / mtd.eb_size, ofs % mtd.eb_size, readbuf, bs)) {
+				errmsg("mtd_read");
 				goto closeall;
 			}
 		}
@@ -417,11 +415,11 @@ int main(int argc, char * const argv[])
 			}
 			if (stat1.failed != stat2.failed)
 				fprintf(stderr, "ECC: %d uncorrectable bitflip(s)"
-						" at offset 0x%08lx\n",
+						" at offset 0x%08llx\n",
 						stat2.failed - stat1.failed, ofs);
 			if (stat1.corrected != stat2.corrected)
 				fprintf(stderr, "ECC: %d corrected bitflip(s) at"
-						" offset 0x%08lx\n",
+						" offset 0x%08llx\n",
 						stat2.corrected - stat1.corrected, ofs);
 			stat1 = stat2;
 		}
@@ -440,25 +438,24 @@ int main(int argc, char * const argv[])
 			continue;
 
 		if (badblock) {
-			memset(oobbuf, 0xff, meminfo.oobsize);
+			memset(oobbuf, 0xff, mtd.oob_size);
 		} else {
 			/* Read OOB data and exit on failure */
-			oob.start = ofs;
-			if (ioctl(fd, MEMREADOOB, &oob) != 0) {
-				perror("ioctl(MEMREADOOB)");
+			if (mtd_read_oob(mtd_desc, &mtd, fd, ofs, mtd.oob_size, oobbuf)) {
+				errmsg("libmtd: mtd_read_oob");
 				goto closeall;
 			}
 		}
 
 		/* Write out OOB data */
 		if (pretty_print) {
-			for (i = 0; i < meminfo.oobsize; i += PRETTY_ROW_SIZE) {
-				pretty_dump_to_buffer(oobbuf + i, meminfo.oobsize - i,
+			for (i = 0; i < mtd.oob_size; i += PRETTY_ROW_SIZE) {
+				pretty_dump_to_buffer(oobbuf + i, mtd.oob_size - i,
 						pretty_buf, PRETTY_BUF_LEN, false, canonical, 0);
 				write(ofd, pretty_buf, strlen(pretty_buf));
 			}
 		} else
-			write(ofd, oobbuf, meminfo.oobsize);
+			write(ofd, oobbuf, mtd.oob_size);
 	}
 
 	/* reset oobinfo */
-- 
1.7.0.4