[PATCH 2/6] fs: add rename infrastructure

[Gabriel Dalimonte]

Signed-off-by: Gabriel Dalimonte <gabriel.dalimonte at gmail.com>
---

 fs/fs.c      | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 include/fs.h | 13 +++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/fs/fs.c b/fs/fs.c
index 99ddcc5e37..160a43c957 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_path,
+					const char *new_path)
+{
+	return -1;
+}
+
 struct fstype_info {
 	int fstype;
 	char *name;
@@ -183,6 +189,7 @@ struct fstype_info {
 	int (*unlink)(const char *filename);
 	int (*mkdir)(const char *dirname);
 	int (*ln)(const char *filename, const char *target);
+	int (*rename)(const char *old_path, const char *new_path);
 };
 
 static struct fstype_info fstypes[] = {
@@ -206,6 +213,7 @@ static struct fstype_info fstypes[] = {
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
 #endif
+		.rename = fs_rename_unsupported,
 		.uuid = fat_uuid,
 		.opendir = fat_opendir,
 		.readdir = fat_readdir,
@@ -238,6 +246,7 @@ 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)
@@ -257,6 +266,7 @@ static struct fstype_info fstypes[] = {
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
 		.ln = fs_ln_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 #endif
 #if CONFIG_IS_ENABLED(SEMIHOSTING)
@@ -276,6 +286,7 @@ static struct fstype_info fstypes[] = {
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
 		.ln = fs_ln_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 #endif
 #ifndef CONFIG_XPL_BUILD
@@ -296,6 +307,7 @@ static struct fstype_info fstypes[] = {
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
 		.ln = fs_ln_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 #endif
 #endif
@@ -317,6 +329,7 @@ static struct fstype_info fstypes[] = {
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
 		.ln = fs_ln_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 #endif
 #endif
@@ -339,6 +352,7 @@ 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 +374,7 @@ static struct fstype_info fstypes[] = {
 		.ln = fs_ln_unsupported,
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 #endif
 	{
@@ -378,6 +393,7 @@ static struct fstype_info fstypes[] = {
 		.unlink = fs_unlink_unsupported,
 		.mkdir = fs_mkdir_unsupported,
 		.ln = fs_ln_unsupported,
+		.rename = fs_rename_unsupported,
 	},
 };
 
@@ -713,6 +729,22 @@ int fs_ln(const char *fname, const char *target)
 	return ret;
 }
 
+int fs_rename(const char *old_path, const char *new_path)
+{
+	struct fstype_info *info = fs_get_info(fs_type);
+	int ret;
+
+	ret = info->rename(old_path, new_path);
+
+	if (ret < 0) {
+		log_err("** Unable to rename %s -> %s **\n", old_path, new_path);
+		ret = -1;
+	}
+	fs_close();
+
+	return ret;
+}
+
 int do_size(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 	    int fstype)
 {
@@ -975,6 +1007,21 @@ int do_ln(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 	return 0;
 }
 
+int do_rename(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
+	      int fstype)
+{
+	if (argc != 5)
+		return CMD_RET_USAGE;
+
+	if (fs_set_blk_dev(argv[1], argv[2], fstype))
+		return 1;
+
+	if (fs_rename(argv[3], argv[4]))
+		return 1;
+
+	return 0;
+}
+
 int do_fs_types(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
 {
 	struct fstype_info *drv = fstypes;
diff --git a/include/fs.h b/include/fs.h
index 2474880385..24b121f55d 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -270,6 +270,17 @@ int fs_unlink(const char *filename);
  */
 int fs_mkdir(const char *filename);
 
+/**
+ * fs_rename - rename a file or directory
+ *
+ * @old_path: existing path of the file/directory to rename
+ * @new_path: new path of the file/directory. If this points to an existing
+ * file or empty directory, the existing file/directory will be unlinked.
+ *
+ * Return: 0 on success, -1 on error conditions
+ */
+int fs_rename(const char *old_path, const char *new_path);
+
 /*
  * Common implementation for various filesystem commands, optionally limited
  * to a specific filesystem type via the fstype parameter.
@@ -290,6 +301,8 @@ int do_mkdir(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 	     int fstype);
 int do_ln(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 	  int fstype);
+int do_rename(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
+	      int fstype);
 
 /*
  * Determine the UUID of the specified filesystem and print it. Optionally it is
-- 
2.34.1