UBUNTU: Start new release

[mirror_ubuntu-zesty-kernel.git] / fs / coredump.c

diff --git a/fs/coredump.c b/fs/coredump.c
index e525b6017cdf863fd811425fb603070be40420b2..ae6b05629ca174d714bbdb3db477bee8f0d8bff8 100644 (file)
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -833,3 +833,21 @@ int dump_align(struct coredump_params *cprm, int align)
        return mod ? dump_skip(cprm, align - mod) : 1;
 }
 EXPORT_SYMBOL(dump_align);
+
+/*
+ * Ensures that file size is big enough to contain the current file
+ * postion. This prevents gdb from complaining about a truncated file
+ * if the last "write" to the file was dump_skip.
+ */
+void dump_truncate(struct coredump_params *cprm)
+{
+       struct file *file = cprm->file;
+       loff_t offset;
+
+       if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
+               offset = file->f_op->llseek(file, 0, SEEK_CUR);
+               if (i_size_read(file->f_mapping->host) < offset)
+                       do_truncate(file->f_path.dentry, offset, 0, file);
+       }
+}
+EXPORT_SYMBOL(dump_truncate);