Fix ext2/ext4 filesystem accesses beyond 2TiB

With CONFIG_SYS_64BIT_LBA, lbaint_t gets defined as a 64-bit type,
which is required to represent block numbers for storage devices that
exceed 2TiB (the block size usually is 512B), e.g. recent hard drives

We now use lbaint_t for partition offset to reflect the lbaint_t change,
and access partitions beyond or crossing the 2.1TiB limit.
This required changes to signature of ext4fs_devread(), and type of all
variables relatives to block sector.

ext2/ext4 fs uses logical block represented by a 32 bit value. Logical
block is a multiple of device block sector. To avoid overflow problem
when calling ext4fs_devread(), we need to cast the sector parameter.

Signed-off-by: Frédéric Leroy <fredo@starox.org>

1 files changed, 7 insertions, 7 deletions

diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c
index 1954afb91d..20ff10f7aa 100644
--- a/fs/ext4/ext4fs.c
+++ b/fs/ext4/ext4fs.c
@@ -62,16 +62,16 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos,
 {
 	struct ext_filesystem *fs = get_fs();
 	int i;
-	int blockcnt;
+	lbaint_t blockcnt;
 	int log2blksz = fs->dev_desc->log2blksz;
 	int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
 	int blocksize = (1 << (log2_fs_blocksize + log2blksz));
 	unsigned int filesize = __le32_to_cpu(node->inode.size);
-	int previous_block_number = -1;
-	int delayed_start = 0;
-	int delayed_extent = 0;
-	int delayed_skipfirst = 0;
-	int delayed_next = 0;
+	lbaint_t previous_block_number = -1;
+	lbaint_t delayed_start = 0;
+	lbaint_t delayed_extent = 0;
+	lbaint_t delayed_skipfirst = 0;
+	lbaint_t delayed_next = 0;
 	char *delayed_buf = NULL;
 	short status;
 
@@ -82,7 +82,7 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos,
 	blockcnt = ((len + pos) + blocksize - 1) / blocksize;
 
 	for (i = pos / blocksize; i < blockcnt; i++) {
-		int blknr;
+		lbaint_t blknr;
 		int blockoff = pos % blocksize;
 		int blockend = blocksize;
 		int skipfirst = 0;