[PATCH 06/13] vfs: new helper: vfs_parse_ro_rw()
From: Miklos Szeredi <hidden>
Date: 2019-06-19 12:31:18
Also in:
linux-fsdevel, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
This just parses the "ro" and "rw" options and sets sb_flags accordingly. Signed-off-by: Miklos Szeredi <redacted> --- 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