FAT: implement fat_set_blk_dev(), convert cmd_fat.c

This makes the FAT filesystem API more consistent with other block-based
filesystems. If in the future standard multi-filesystem commands such as
"ls" or "load" are implemented, having FAT work the same way as other
filesystems will be necessary.

Convert cmd_fat.c to the new API, so the code looks more like other files
implementing the same commands for other filesystems.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>

common/cmd_fat.c

@@ -55,7 +55,7 @@ int do_fat_fsload (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		return 1;
 
 	dev = dev_desc->dev;
-	if (fat_register_device(dev_desc,part)!=0) {
+	if (fat_set_blk_dev(dev_desc, &info) != 0) {
 		printf("\n** Unable to use %s %d:%d for fatload **\n",
 			argv[1], dev, part);
 		return 1;
@@ -111,7 +111,7 @@ int do_fat_ls (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		return 1;
 
 	dev = dev_desc->dev;
-	if (fat_register_device(dev_desc,part)!=0) {
+	if (fat_set_blk_dev(dev_desc, &info) != 0) {
 		printf("\n** Unable to use %s %d:%d for fatls **\n",
 			argv[1], dev, part);
 		return 1;
@@ -149,7 +149,7 @@ int do_fat_fsinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		return 1;
 
 	dev = dev_desc->dev;
-	if (fat_register_device(dev_desc,part)!=0) {
+	if (fat_set_blk_dev(dev_desc, &info) != 0) {
 		printf("\n** Unable to use %s %d:%d for fatinfo **\n",
 			argv[1], dev, part);
 		return 1;
@@ -185,7 +185,7 @@ static int do_fat_fswrite(cmd_tbl_t *cmdtp, int flag,
 
 	dev = dev_desc->dev;
 
-	if (fat_register_device(dev_desc, part) != 0) {
+	if (fat_set_blk_dev(dev_desc, &info) != 0) {
 		printf("\n** Unable to use %s %d:%d for fatwrite **\n",
 			argv[1], dev, part);
 		return 1;

fs/fat/fat.c

@@ -61,44 +61,12 @@ static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
 			cur_part_info.start + block, nr_blocks, buf);
 }
 
-int fat_register_device(block_dev_desc_t * dev_desc, int part_no)
+int fat_set_blk_dev(block_dev_desc_t *dev_desc, disk_partition_t *info)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 
-	/* First close any currently found FAT filesystem */
-	cur_dev = NULL;
-
-#if (defined(CONFIG_CMD_IDE) || \
-     defined(CONFIG_CMD_SATA) || \
-     defined(CONFIG_CMD_SCSI) || \
-     defined(CONFIG_CMD_USB) || \
-     defined(CONFIG_MMC) || \
-     defined(CONFIG_SYSTEMACE) )
-
-	/* Read the partition table, if present */
-	if (!get_partition_info(dev_desc, part_no, &cur_part_info))
-		cur_dev = dev_desc;
-#endif
-
-	/* Otherwise it might be a superfloppy (whole-disk FAT filesystem) */
-	if (!cur_dev) {
-		if (part_no != 0) {
-			printf("** Partition %d not valid on device %d **\n",
-					part_no, dev_desc->dev);
-			return -1;
-		}
-
-		cur_dev = dev_desc;
-		cur_part_info.start = 0;
-		cur_part_info.size = dev_desc->lba;
-		cur_part_info.blksz = dev_desc->blksz;
-		cur_part_info.name[0] = 0;
-		cur_part_info.type[0] = 0;
-		cur_part_info.bootable = 0;
-#ifdef CONFIG_PARTITION_UUIDS
-		cur_part_info.uuid[0] = 0;
-#endif
-	}
+	cur_dev = dev_desc;
+	cur_part_info = *info;
 
 	/* Make sure it has a valid FAT header */
 	if (disk_read(0, 1, buffer) != 1) {
@@ -122,6 +90,34 @@ int fat_register_device(block_dev_desc_t * dev_desc, int part_no)
 	return -1;
 }
 
+int fat_register_device(block_dev_desc_t *dev_desc, int part_no)
+{
+	disk_partition_t info;
+
+	/* First close any currently found FAT filesystem */
+	cur_dev = NULL;
+
+	/* Read the partition table, if present */
+	if (get_partition_info(dev_desc, part_no, &info)) {
+		if (part_no != 0) {
+			printf("** Partition %d not valid on device %d **\n",
+					part_no, dev_desc->dev);
+			return -1;
+		}
+
+		info.start = 0;
+		info.size = dev_desc->lba;
+		info.blksz = dev_desc->blksz;
+		info.name[0] = 0;
+		info.type[0] = 0;
+		info.bootable = 0;
+#ifdef CONFIG_PARTITION_UUIDS
+		info.uuid[0] = 0;
+#endif
+	}
+
+	return fat_set_blk_dev(dev_desc, &info);
+}
 
 /*
  * Get the first occurence of a directory delimiter ('/' or '\') in a string.

include/fat.h

@@ -212,6 +212,7 @@ long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
 		      unsigned long maxsize);
 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
 const char *file_getfsname(int idx);
+int fat_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
 int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
 
 int file_fat_write(const char *filename, void *buffer, unsigned long maxsize);