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>

common/cmd_ext4.c

@@ -42,6 +42,12 @@
 #include <usb.h>
 #endif
 
+int do_ext4_size(cmd_tbl_t *cmdtp, int flag, int argc,
+						char *const argv[])
+{
+	return do_size(cmdtp, flag, argc, argv, FS_TYPE_EXT);
+}
+
 int do_ext4_load(cmd_tbl_t *cmdtp, int flag, int argc,
 						char *const argv[])
 {
@@ -113,6 +119,14 @@ U_BOOT_CMD(ext4write, 6, 1, do_ext4_write,
 
 #endif
 
+U_BOOT_CMD(
+	ext4size,	4,	0,	do_ext4_size,
+	"determine a file's size",
+	"<interface> <dev[:part]> <filename>\n"
+	"    - Find file 'filename' from 'dev' on 'interface'\n"
+	"      and determine its size."
+);
+
 U_BOOT_CMD(ext4ls, 4, 1, do_ext4_ls,
 	   "list files in a directory (default /)",
 	   "<interface> <dev[:part]> [directory]\n"

common/cmd_fat.c

@@ -18,6 +18,19 @@
 #include <fat.h>
 #include <fs.h>
 
+int do_fat_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	return do_size(cmdtp, flag, argc, argv, FS_TYPE_FAT);
+}
+
+U_BOOT_CMD(
+	fatsize,	4,	0,	do_fat_size,
+	"determine a file's size",
+	"<interface> <dev[:part]> <filename>\n"
+	"    - Find file 'filename' from 'dev' on 'interface'\n"
+	"      and determine its size."
+);
+
 int do_fat_fsload (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	return do_load(cmdtp, flag, argc, argv, FS_TYPE_FAT);

common/cmd_fs.c

@@ -20,6 +20,19 @@
 #include <command.h>
 #include <fs.h>
 
+static int do_size_wrapper(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	return do_size(cmdtp, flag, argc, argv, FS_TYPE_ANY);
+}
+
+U_BOOT_CMD(
+	size,	4,	0,	do_size_wrapper,
+	"determine a file's size",
+	"<interface> <dev[:part]> <filename>\n"
+	"    - Find file 'filename' from 'dev' on 'interface'\n"
+	"      and determine its size."
+);
+
 static int do_load_wrapper(cmd_tbl_t *cmdtp, int flag, int argc,
 				char * const argv[])
 {

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)
 {
 }

include/ext4fs.h

@@ -136,6 +136,7 @@ void ext4fs_close(void);
 void ext4fs_reinit_global(void);
 int ext4fs_ls(const char *dirname);
 int ext4fs_exists(const char *filename);
+int ext4fs_size(const char *filename);
 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf);
 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);

include/fat.h

@@ -198,6 +198,7 @@ int file_cd(const char *path);
 int file_fat_detectfs(void);
 int file_fat_ls(const char *dir);
 int fat_exists(const char *filename);
+int fat_size(const char *filename);
 long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
 		      unsigned long maxsize);
 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);

include/fs.h

@@ -50,6 +50,13 @@ int fs_ls(const char *dirname);
  */
 int fs_exists(const char *filename);
 
+/*
+ * Determine a file's size
+ *
+ * Returns the file's size in bytes, or a negative value if it doesn't exist.
+ */
+int fs_size(const char *filename);
+
 /*
  * Read file "filename" from the partition previously set by fs_set_blk_dev(),
  * to address "addr", starting at byte offset "offset", and reading "len"
@@ -75,6 +82,8 @@ int fs_write(const char *filename, ulong addr, int offset, int len);
  * Common implementation for various filesystem commands, optionally limited
  * to a specific filesystem type via the fstype parameter.
  */
+int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
+		int fstype);
 int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 		int fstype);
 int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],

include/sandboxfs.h

@@ -26,6 +26,7 @@ long sandbox_fs_read_at(const char *filename, unsigned long pos,
 void sandbox_fs_close(void);
 int sandbox_fs_ls(const char *dirname);
 int sandbox_fs_exists(const char *filename);
+int sandbox_fs_size(const char *filename);
 int fs_read_sandbox(const char *filename, void *buf, int offset, int len);
 int fs_write_sandbox(const char *filename, void *buf, int offset, int len);