[PATCH] md: better handling for read error in raid1 during resync

[firefly-linux-kernel-4.4.55.git] / ipc / shm.c

diff --git a/ipc/shm.c b/ipc/shm.c
index b58c651d31ae23a36c58a1de3005e6b5d46a2662..0ef4a1cf3e27246b54a2e31865e85d9ccded7398 100644 (file)
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -157,14 +157,22 @@ static void shm_close (struct vm_area_struct *shmd)
 
 static int shm_mmap(struct file * file, struct vm_area_struct * vma)
 {
-       file_accessed(file);
-       vma->vm_ops = &shm_vm_ops;
-       shm_inc(file->f_dentry->d_inode->i_ino);
-       return 0;
+       int ret;
+
+       ret = shmem_mmap(file, vma);
+       if (ret == 0) {
+               vma->vm_ops = &shm_vm_ops;
+               shm_inc(file->f_dentry->d_inode->i_ino);
+       }
+
+       return ret;
 }
 
 static struct file_operations shm_file_operations = {
-       .mmap   = shm_mmap
+       .mmap   = shm_mmap,
+#ifndef CONFIG_MMU
+       .get_unmapped_area = shmem_get_unmapped_area,
+#endif
 };
 
 static struct vm_operations_struct shm_vm_ops = {
@@ -212,8 +220,16 @@ static int newseg (key_t key, int shmflg, size_t size)
                file = hugetlb_zero_setup(size);
                shp->mlock_user = current->user;
        } else {
+               int acctflag = VM_ACCOUNT;
+               /*
+                * Do not allow no accounting for OVERCOMMIT_NEVER, even
+                * if it's asked for.
+                */
+               if  ((shmflg & SHM_NORESERVE) &&
+                               sysctl_overcommit_memory != OVERCOMMIT_NEVER)
+                       acctflag = 0;
                sprintf (name, "SYSV%08x", key);
-               file = shmem_file_setup(name, size, VM_ACCOUNT);
+               file = shmem_file_setup(name, size, acctflag);
        }
        error = PTR_ERR(file);
        if (IS_ERR(file))