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-rw-r--r--fs/sysv/file.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/sysv/file.c b/fs/sysv/file.c
new file mode 100644
index 000000000..90e00124e
--- /dev/null
+++ b/fs/sysv/file.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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 user_namespace *mnt_userns,
+ struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = d_inode(dentry);
+ int error;
+
+ error = setattr_prepare(&init_user_ns, dentry, 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(&init_user_ns, inode, attr);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+const struct inode_operations sysv_file_inode_operations = {
+ .setattr = sysv_setattr,
+ .getattr = sysv_getattr,
+};