tools headers UAPI: Sync linux/prctl.h with the kernel sources

[linux-2.6-microblaze.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index a5244e0..b8abccd 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -79,7 +79,7 @@ static void kill_bdev(struct block_device *bdev)
 {
        struct address_space *mapping = bdev->bd_inode->i_mapping;
 
-       if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
+       if (mapping_empty(mapping))
                return;
 
        invalidate_bh_lrus();
@@ -1677,6 +1677,7 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
        struct inode *bd_inode = bdev_file_inode(file);
        loff_t size = i_size_read(bd_inode);
        struct blk_plug plug;
+       size_t shorted = 0;
        ssize_t ret;
 
        if (bdev_read_only(I_BDEV(bd_inode)))
@@ -1694,12 +1695,17 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
        if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == IOCB_NOWAIT)
                return -EOPNOTSUPP;
 
-       iov_iter_truncate(from, size - iocb->ki_pos);
+       size -= iocb->ki_pos;
+       if (iov_iter_count(from) > size) {
+               shorted = iov_iter_count(from) - size;
+               iov_iter_truncate(from, size);
+       }
 
        blk_start_plug(&plug);
        ret = __generic_file_write_iter(iocb, from);
        if (ret > 0)
                ret = generic_write_sync(iocb, ret);
+       iov_iter_reexpand(from, iov_iter_count(from) + shorted);
        blk_finish_plug(&plug);
        return ret;
 }
@@ -1711,13 +1717,21 @@ ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
        struct inode *bd_inode = bdev_file_inode(file);
        loff_t size = i_size_read(bd_inode);
        loff_t pos = iocb->ki_pos;
+       size_t shorted = 0;
+       ssize_t ret;
 
        if (pos >= size)
                return 0;
 
        size -= pos;
-       iov_iter_truncate(to, size);
-       return generic_file_read_iter(iocb, to);
+       if (iov_iter_count(to) > size) {
+               shorted = iov_iter_count(to) - size;
+               iov_iter_truncate(to, size);
+       }
+
+       ret = generic_file_read_iter(iocb, to);
+       iov_iter_reexpand(to, iov_iter_count(to) + shorted);
+       return ret;
 }
 EXPORT_SYMBOL_GPL(blkdev_read_iter);