For filesystems larger than 2TB the final sector number passed to
map_bh might overflow the range representable in a 32-bit data type.
Make sure we use a sector_t for it and the arithmetics calculating it.
Signed-off-by: Christoph Hellwig <hch@xxxxxxxxxx>
Index: linux-2.6/fs/hfsplus/extents.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/extents.c 2011-02-15 13:42:05.456421843 +0100
+++ linux-2.6/fs/hfsplus/extents.c 2011-02-15 13:42:41.667422001 +0100
@@ -209,6 +209,7 @@ int hfsplus_get_block(struct inode *inod
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
int res = -EIO;
u32 ablock, dblock, mask;
+ sector_t sector;
int was_dirty = 0;
int shift;
@@ -255,10 +256,12 @@ int hfsplus_get_block(struct inode *inod
done:
dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n",
inode->i_ino, (long long)iblock, dblock);
+
mask = (1 << sbi->fs_shift) - 1;
- map_bh(bh_result, sb,
- (dblock << sbi->fs_shift) + sbi->blockoffset +
- (iblock & mask));
+ sector = ((sector_t)dblock << sbi->fs_shift) +
+ sbi->blockoffset + (iblock & mask);
+ map_bh(bh_result, sb, sector);
+
if (create) {
set_buffer_new(bh_result);
hip->phys_size += sb->s_blocksize;
--
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