fs: implement size/fatsize/ext4size

These commands may be used to determine the size of a file without
actually reading the whole file content into memory. This may be used
to determine if the file will fit into the memory buffer that will
contain it. In particular, the DFU code will use it for this purpose
in the next commit.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

fs/ext4/ext4fs.c

@@ -182,6 +182,11 @@ int ext4fs_exists(const char *filename)
 	return file_len >= 0;
 }
 
+int ext4fs_size(const char *filename)
+{
+	return ext4fs_open(filename);
+}
+
 int ext4fs_read(char *buf, unsigned len)
 {
 	if (ext4fs_root == NULL || ext4fs_file == NULL)

fs/fat/fat.c

@@ -1243,6 +1243,11 @@ int fat_exists(const char *filename)
 	return sz >= 0;
 }
 
+int fat_size(const char *filename)
+{
+	return do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1);
+}
+
 long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
 		      unsigned long maxsize)
 {

fs/fs.c

@@ -46,6 +46,11 @@ static inline int fs_exists_unsupported(const char *filename)
 	return 0;
 }
 
+static inline int fs_size_unsupported(const char *filename)
+{
+	return -1;
+}
+
 static inline int fs_read_unsupported(const char *filename, void *buf,
 				      int offset, int len)
 {
@@ -77,6 +82,7 @@ struct fstype_info {
 		     disk_partition_t *fs_partition);
 	int (*ls)(const char *dirname);
 	int (*exists)(const char *filename);
+	int (*size)(const char *filename);
 	int (*read)(const char *filename, void *buf, int offset, int len);
 	int (*write)(const char *filename, void *buf, int offset, int len);
 	void (*close)(void);
@@ -91,6 +97,7 @@ static struct fstype_info fstypes[] = {
 		.close = fat_close,
 		.ls = file_fat_ls,
 		.exists = fat_exists,
+		.size = fat_size,
 		.read = fat_read_file,
 		.write = fs_write_unsupported,
 	},
@@ -103,6 +110,7 @@ static struct fstype_info fstypes[] = {
 		.close = ext4fs_close,
 		.ls = ext4fs_ls,
 		.exists = ext4fs_exists,
+		.size = ext4fs_size,
 		.read = ext4_read_file,
 		.write = fs_write_unsupported,
 	},
@@ -115,6 +123,7 @@ static struct fstype_info fstypes[] = {
 		.close = sandbox_fs_close,
 		.ls = sandbox_fs_ls,
 		.exists = sandbox_fs_exists,
+		.size = sandbox_fs_size,
 		.read = fs_read_sandbox,
 		.write = fs_write_sandbox,
 	},
@@ -126,6 +135,7 @@ static struct fstype_info fstypes[] = {
 		.close = fs_close_unsupported,
 		.ls = fs_ls_unsupported,
 		.exists = fs_exists_unsupported,
+		.size = fs_size_unsupported,
 		.read = fs_read_unsupported,
 		.write = fs_write_unsupported,
 	},
@@ -223,6 +233,19 @@ int fs_exists(const char *filename)
 	return ret;
 }
 
+int fs_size(const char *filename)
+{
+	int ret;
+
+	struct fstype_info *info = fs_get_info(fs_type);
+
+	ret = info->size(filename);
+
+	fs_close();
+
+	return ret;
+}
+
 int fs_read(const char *filename, ulong addr, int offset, int len)
 {
 	struct fstype_info *info = fs_get_info(fs_type);
@@ -266,6 +289,26 @@ int fs_write(const char *filename, ulong addr, int offset, int len)
 	return ret;
 }
 
+int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
+		int fstype)
+{
+	int size;
+
+	if (argc != 4)
+		return CMD_RET_USAGE;
+
+	if (fs_set_blk_dev(argv[1], argv[2], fstype))
+		return 1;
+
+	size = fs_size(argv[3]);
+	if (size < 0)
+		return CMD_RET_FAILURE;
+
+	setenv_hex("filesize", size);
+
+	return 0;
+}
+
 int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 		int fstype)
 {

fs/sandbox/sandboxfs.c

@@ -80,6 +80,11 @@ int sandbox_fs_exists(const char *filename)
 	return sz >= 0;
 }
 
+int sandbox_fs_size(const char *filename)
+{
+	return os_get_filesize(filename);
+}
+
 void sandbox_fs_close(void)
 {
 }