From 04735e9c5578dd4f3584be5454b9779e8e5c2af9 Mon Sep 17 00:00:00 2001 From: Frederic Leroy Date: Wed, 26 Jun 2013 18:11:25 +0200 Subject: Fix ext2/ext4 filesystem accesses beyond 2TiB MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 --- fs/ext4/ext4fs.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'fs/ext4/ext4fs.c') 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; -- cgit v1.2.3