vfs: fix data corruption when blocksize < pagesize for mmaped data

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / buffer.c

diff --git a/fs/buffer.c b/fs/buffer.c
index 2e0a9e1..4d06a57 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2077,6 +2077,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
                        struct page *page, void *fsdata)
 {
        struct inode *inode = mapping->host;
+       loff_t old_size = inode->i_size;
        int i_size_changed = 0;
 
        copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
@@ -2096,6 +2097,8 @@ int generic_write_end(struct file *file, struct address_space *mapping,
        unlock_page(page);
        page_cache_release(page);
 
+       if (old_size < pos)
+               pagecache_isize_extended(inode, old_size, pos);
        /*
         * Don't mark the inode dirty under page lock. First, it unnecessarily
         * makes the holding time of page lock longer. Second, it forces lock