Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / sysv / file.c

diff --git a/kernel/fs/sysv/file.c b/kernel/fs/sysv/file.c
new file mode 100644 (file)
index 0000000..82ddc09
--- /dev/null
+++ b/kernel/fs/sysv/file.c
@@ -0,0 +1,57 @@
+/*
+ *  linux/fs/sysv/file.c
+ *
+ *  minix/file.c
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  coh/file.c
+ *  Copyright (C) 1993  Pascal Haible, Bruno Haible
+ *
+ *  sysv/file.c
+ *  Copyright (C) 1993  Bruno Haible
+ *
+ *  SystemV/Coherent regular file handling primitives
+ */
+
+#include "sysv.h"
+
+/*
+ * We have mostly NULLs here: the current defaults are OK for
+ * the coh filesystem.
+ */
+const struct file_operations sysv_file_operations = {
+       .llseek         = generic_file_llseek,
+       .read_iter      = generic_file_read_iter,
+       .write_iter     = generic_file_write_iter,
+       .mmap           = generic_file_mmap,
+       .fsync          = generic_file_fsync,
+       .splice_read    = generic_file_splice_read,
+};
+
+static int sysv_setattr(struct dentry *dentry, struct iattr *attr)
+{
+       struct inode *inode = d_inode(dentry);
+       int error;
+
+       error = inode_change_ok(inode, attr);
+       if (error)
+               return error;
+
+       if ((attr->ia_valid & ATTR_SIZE) &&
+           attr->ia_size != i_size_read(inode)) {
+               error = inode_newsize_ok(inode, attr->ia_size);
+               if (error)
+                       return error;
+               truncate_setsize(inode, attr->ia_size);
+               sysv_truncate(inode);
+       }
+
+       setattr_copy(inode, attr);
+       mark_inode_dirty(inode);
+       return 0;
+}
+
+const struct inode_operations sysv_file_inode_operations = {
+       .setattr        = sysv_setattr,
+       .getattr        = sysv_getattr,
+};