1 files changed, 12 insertions, 0 deletions

diff --git a/ipc/shm.c b/ipc/shm.c
index 5e2cbfdab6fc..41c1285d697a 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -393,6 +393,16 @@ static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync)
         return sfd->file->f_op->fsync(sfd->file, start, end, datasync);
 }
 
+static long shm_fallocate(struct file *file, int mode, loff_t offset,
+                          loff_t len)
+{
+        struct shm_file_data *sfd = shm_file_data(file);
+
+        if (!sfd->file->f_op->fallocate)
+                return -EOPNOTSUPP;
+        return sfd->file->f_op->fallocate(file, mode, offset, len);
+}
+
 static unsigned long shm_get_unmapped_area(struct file *file,
         unsigned long addr, unsigned long len, unsigned long pgoff,
         unsigned long flags)
@@ -410,6 +420,7 @@ static const struct file_operations shm_file_operations = {
         .get_unmapped_area      = shm_get_unmapped_area,
 #endif
         .llseek         = noop_llseek,
+        .fallocate      = shm_fallocate,
 };
 
 static const struct file_operations shm_file_operations_huge = {
@@ -418,6 +429,7 @@ static const struct file_operations shm_file_operations_huge = {
         .release        = shm_release,
         .get_unmapped_area      = shm_get_unmapped_area,
         .llseek         = noop_llseek,
+        .fallocate      = shm_fallocate,
 };
 
 int is_file_shm_hugepages(struct file *file)