1 files changed, 40 insertions, 22 deletions

diff --git a/fs/ext4/dev.c b/fs/ext4/dev.c
index 464a67d53..3e993cc22 100644
--- a/fs/ext4/dev.c
+++ b/fs/ext4/dev.c
@@ -40,6 +40,7 @@
 #include <config.h>
 #include <ext4fs.h>
 #include <ext_common.h>
+#include "ext4_common.h"
 
 unsigned long part_offset;
 
@@ -48,37 +49,41 @@ static disk_partition_t *part_info;
 
 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
 {
+	assert(rbdd->blksz == (1 << rbdd->log2blksz));
 	ext4fs_block_dev_desc = rbdd;
 	part_info = info;
 	part_offset = info->start;
-	get_fs()->total_sect = (info->size * info->blksz) / SECTOR_SIZE;
+	get_fs()->total_sect = (info->size * info->blksz) >>
+		get_fs()->dev_desc->log2blksz;
 	get_fs()->dev_desc = rbdd;
 }
 
 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
 {
-	ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE);
 	unsigned block_len;
+	int log2blksz = ext4fs_block_dev_desc->log2blksz;
+	ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_block_dev_desc ?
+						 ext4fs_block_dev_desc->blksz :
+						 0));
+	if (ext4fs_block_dev_desc == NULL) {
+		printf("** Invalid Block Device Descriptor (NULL)\n");
+		return 0;
+	}
 
 	/* Check partition boundaries */
-	if ((sector < 0)
-	    || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
-		part_info->size)) {
+	if ((sector < 0) ||
+	    ((sector + ((byte_offset + byte_len - 1) >> log2blksz))
+	     >= part_info->size)) {
 		printf("%s read outside partition %d\n", __func__, sector);
 		return 0;
 	}
 
 	/* Get the read to the beginning of a partition */
-	sector += byte_offset >> SECTOR_BITS;
-	byte_offset &= SECTOR_SIZE - 1;
+	sector += byte_offset >> log2blksz;
+	byte_offset &= ext4fs_block_dev_desc->blksz - 1;
 
 	debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
 
-	if (ext4fs_block_dev_desc == NULL) {
-		printf("** Invalid Block Device Descriptor (NULL)\n");
-		return 0;
-	}
-
 	if (byte_offset != 0) {
 		/* read first part which isn't aligned with start of sector */
 		if (ext4fs_block_dev_desc->
@@ -89,9 +94,12 @@ int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
 			return 0;
 		}
 		memcpy(buf, sec_buf + byte_offset,
-			min(SECTOR_SIZE - byte_offset, byte_len));
-		buf += min(SECTOR_SIZE - byte_offset, byte_len);
-		byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
+			min(ext4fs_block_dev_desc->blksz
+			    - byte_offset, byte_len));
+		buf += min(ext4fs_block_dev_desc->blksz
+			   - byte_offset, byte_len);
+		byte_len -= min(ext4fs_block_dev_desc->blksz
+				- byte_offset, byte_len);
 		sector++;
 	}
 
@@ -99,12 +107,12 @@ int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
 		return 1;
 
 	/* read sector aligned part */
-	block_len = byte_len & ~(SECTOR_SIZE - 1);
+	block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
 
 	if (block_len == 0) {
-		ALLOC_CACHE_ALIGN_BUFFER(u8, p, SECTOR_SIZE);
+		ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz);
 
-		block_len = SECTOR_SIZE;
+		block_len = ext4fs_block_dev_desc->blksz;
 		ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
 						  part_info->start + sector,
 						  1, (unsigned long *)p);
@@ -114,16 +122,16 @@ int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
 
 	if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
 					       part_info->start + sector,
-					       block_len / SECTOR_SIZE,
+					       block_len >> log2blksz,
 					       (unsigned long *) buf) !=
-					       block_len / SECTOR_SIZE) {
+					       block_len >> log2blksz) {
 		printf(" ** %s read error - block\n", __func__);
 		return 0;
 	}
-	block_len = byte_len & ~(SECTOR_SIZE - 1);
+	block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
 	buf += block_len;
 	byte_len -= block_len;
-	sector += block_len / SECTOR_SIZE;
+	sector += block_len / ext4fs_block_dev_desc->blksz;
 
 	if (byte_len != 0) {
 		/* read rest of data which are not in whole sector */
@@ -138,3 +146,13 @@ int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
 	}
 	return 1;
 }
+
+int ext4_read_superblock(char *buffer)
+{
+	struct ext_filesystem *fs = get_fs();
+	int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
+	int off = SUPERBLOCK_START % fs->dev_desc->blksz;
+
+	return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
+				buffer);
+}