3 files changed, 7 insertions, 4 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index e08f6a20a5bb..ba11c30f302d 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -70,7 +70,7 @@ static void bdev_inode_switch_bdi(struct inode *inode,
         spin_unlock(&dst->wb.list_lock);
 }
 
-static sector_t max_block(struct block_device *bdev)
+sector_t blkdev_max_block(struct block_device *bdev)
 {
         sector_t retval = ~((sector_t)0);
         loff_t sz = i_size_read(bdev->bd_inode);
@@ -163,7 +163,7 @@ static int
 blkdev_get_block(struct inode *inode, sector_t iblock,
                 struct buffer_head *bh, int create)
 {
-        if (iblock >= max_block(I_BDEV(inode))) {
+        if (iblock >= blkdev_max_block(I_BDEV(inode))) {
                 if (create)
                         return -EIO;
 
@@ -185,7 +185,7 @@ static int
 blkdev_get_blocks(struct inode *inode, sector_t iblock,
                 struct buffer_head *bh, int create)
 {
-        sector_t end_block = max_block(I_BDEV(inode));
+        sector_t end_block = blkdev_max_block(I_BDEV(inode));
         unsigned long max_blocks = bh->b_size >> inode->i_blkbits;
 
         if ((iblock + max_blocks) > end_block) {
diff --git a/fs/buffer.c b/fs/buffer.c
index 351e18ea2e53..ad5938ca357c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -921,6 +921,7 @@ init_page_buffers(struct page *page, struct block_device *bdev,
         struct buffer_head *head = page_buffers(page);
         struct buffer_head *bh = head;
         int uptodate = PageUptodate(page);
+        sector_t end_block = blkdev_max_block(I_BDEV(bdev->bd_inode));
 
         do {
                 if (!buffer_mapped(bh)) {
@@ -929,7 +930,8 @@ init_page_buffers(struct page *page, struct block_device *bdev,
                         bh->b_blocknr = block;
                         if (uptodate)
                                 set_buffer_uptodate(bh);
-                        set_buffer_mapped(bh);
+                        if (block < end_block)
+                                set_buffer_mapped(bh);
                 }
                 block++;
                 bh = bh->b_this_page;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8de675523e46..25c40b9f848a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2051,6 +2051,7 @@ extern void unregister_blkdev(unsigned int, const char *);
 extern struct block_device *bdget(dev_t);
 extern struct block_device *bdgrab(struct block_device *bdev);
 extern void bd_set_size(struct block_device *, loff_t size);
+extern sector_t blkdev_max_block(struct block_device *bdev);
 extern void bd_forget(struct inode *inode);
 extern void bdput(struct block_device *);
 extern void invalidate_bdev(struct block_device *);