This just parses the "ro" and "rw" options and sets sb_flags accordingly.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
---
fs/fs_context.c | 18 ++++++++++++++++++
include/linux/fs_context.h | 1 +
2 files changed, 19 insertions(+)
diff --git a/fs/fs_context.c b/fs/fs_context.c
index c26b353aa858..5012ab7650ec 100644
--- a/fs/fs_context.c
+++ b/fs/fs_context.c
@@ -77,6 +77,24 @@ int vfs_parse_sb_flag(struct fs_context *fc, struct fs_parameter *param)
}
EXPORT_SYMBOL(vfs_parse_sb_flag);
+int vfs_parse_ro_rw(struct fs_context *fc, struct fs_parameter *param)
+{
+ if (strcmp(param->key, "ro") == 0)
+ fc->sb_flags |= SB_RDONLY;
+ else if (strcmp(param->key, "rw") == 0)
+ fc->sb_flags &= ~SB_RDONLY;
+ else
+ return -ENOPARAM;
+
+ if (param->type != fs_value_is_flag)
+ return invalf(fc, "%s: Unexpected value for '%s'",
+ fc->fs_type->name, param->key);
+
+ fc->sb_flags_mask |= SB_RDONLY;
+ return 0;
+}
+EXPORT_SYMBOL(vfs_parse_ro_rw);
+
/**
* vfs_parse_fs_param - Add a single parameter to a superblock config
* @fc: The filesystem context to modify
diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h
index 39f4d8b0a390..bff6796a89ef 100644
--- a/include/linux/fs_context.h
+++ b/include/linux/fs_context.h
@@ -128,6 +128,7 @@ extern struct fs_context *fs_context_for_submount(struct file_system_type *fs_ty
extern struct fs_context *vfs_dup_fs_context(struct fs_context *fc);
extern int vfs_parse_sb_flag(struct fs_context *fc, struct fs_parameter *param);
+extern int vfs_parse_ro_rw(struct fs_context *fc, struct fs_parameter *param);
extern int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param);
extern int vfs_parse_fs_string(struct fs_context *fc, const char *key,
const char *value, size_t v_size);
--
2.21.0
