[PATCH v3 1/6] fs: Add unimplemented rename hook to FS layer

[Daniel Venzin]

The EFI API supports file renaming, which is required by
systemd-stub for its bootcounting implementation.

Signed-off-by: Daniel Venzin <Daniel.Venzin at mt.com>

---

(no changes since v2)

Changes in v2:
- Adapt variable names for better consistency
- Add missing rename hooks

 fs/fs.c      | 30 ++++++++++++++++++++++++++++++
 include/fs.h |  9 +++++++++
 2 files changed, 39 insertions(+)

diff --git a/fs/fs.c b/fs/fs.c
index 99ddcc5e37b..b746d05ebcd 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -143,6 +143,12 @@ static inline int fs_mkdir_unsupported(const char *dirname)
 	return -1;
 }
 
+static inline int fs_rename_unsupported(const char *old_filename,
+					 const char *new_filename)
+{
+	return -1;
+}
+
 struct fstype_info {
 	int fstype;
 	char *name;
@@ -182,6 +188,7 @@ struct fstype_info {
 	void (*closedir)(struct fs_dir_stream *dirs);
 	int (*unlink)(const char *filename);
 	int (*mkdir)(const char *dirname);
+	int (*rename)(const char *old_filename, const char *new_filename);
 	int (*ln)(const char *filename, const char *target);
 };
 
@@ -201,10 +208,12 @@ static struct fstype_info fstypes[] = {
 		.write = file_fat_write,
 		.unlink = fat_unlink,
 		.mkdir = fat_mkdir,
+		.rename = fs_rename_unsupported,
 #else
 		.write = fs_write_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 #endif
 		.uuid = fat_uuid,
 		.opendir = fat_opendir,
@@ -238,6 +247,7 @@ static struct fstype_info fstypes[] = {
 		.closedir = ext4fs_closedir,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 #endif
 #if IS_ENABLED(CONFIG_SANDBOX) && !IS_ENABLED(CONFIG_XPL_BUILD)
@@ -256,6 +266,7 @@ static struct fstype_info fstypes[] = {
 		.opendir = fs_opendir_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 		.ln = fs_ln_unsupported,
 	},
 #endif
@@ -275,6 +286,7 @@ static struct fstype_info fstypes[] = {
 		.opendir = fs_opendir_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 		.ln = fs_ln_unsupported,
 	},
 #endif
@@ -295,6 +307,7 @@ static struct fstype_info fstypes[] = {
 		.opendir = fs_opendir_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 		.ln = fs_ln_unsupported,
 	},
 #endif
@@ -316,6 +329,7 @@ static struct fstype_info fstypes[] = {
 		.opendir = fs_opendir_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 		.ln = fs_ln_unsupported,
 	},
 #endif
@@ -339,6 +353,7 @@ static struct fstype_info fstypes[] = {
 		.ln = fs_ln_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 #endif
 #if IS_ENABLED(CONFIG_FS_EROFS)
@@ -360,6 +375,7 @@ static struct fstype_info fstypes[] = {
 		.ln = fs_ln_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 #endif
 	{
@@ -377,6 +393,7 @@ static struct fstype_info fstypes[] = {
 		.opendir = fs_opendir_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 		.ln = fs_ln_unsupported,
 	},
 };
@@ -697,6 +714,19 @@ int fs_mkdir(const char *dirname)
 	return ret;
 }
 
+int fs_rename(const char *old_filename, const char *new_filename)
+{
+	int ret;
+
+	struct fstype_info *info = fs_get_info(fs_type);
+
+	ret = info->rename(old_filename, new_filename);
+
+	fs_close();
+
+	return ret;
+}
+
 int fs_ln(const char *fname, const char *target)
 {
 	struct fstype_info *info = fs_get_info(fs_type);
diff --git a/include/fs.h b/include/fs.h
index 2474880385d..8c1aa9c1a7b 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -270,6 +270,15 @@ int fs_unlink(const char *filename);
  */
 int fs_mkdir(const char *filename);
 
+/*
+ * fs_rename - Rename a file
+ *
+ * @old_filename: Name of the file to rename
+ * @new_filename: New name for the file
+ * Return: 0 on success, -1 on error conditions
+ */
+int fs_rename(const char *old_filename, const char *new_filename);
+
 /*
  * Common implementation for various filesystem commands, optionally limited
  * to a specific filesystem type via the fstype parameter.
-- 
2.39.5