Merge remote-tracking branch 'stable-rc/linux-4.4.y' into 4.4.85-rc-hikeytemp-4.4.85-rc-hikey

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/fs/coredump.c b/fs/coredump.c
index 5d15c4975ba1..a8852293038a 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -810,3 +810,21 @@ 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);