fs: add filesystem switch libary, implement ls and fsload commands
Implement "ls" and "fsload" commands that act like {fat,ext2}{ls,load},
and transparently handle either file-system. This scheme could easily be
extended to other filesystem types; I only didn't do it for zfs because
I don't have any filesystems of that type to test with.
Replace the implementation of {fat,ext[24]}{ls,load} with this new code
too.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/fs/fs.c b/fs/fs.c
new file mode 100644
index 0000000..23ffa25
--- /dev/null
+++ b/fs/fs.c
@@ -0,0 +1,308 @@
+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <common.h>
+#include <part.h>
+#include <ext4fs.h>
+#include <fat.h>
+#include <fs.h>
+
+static block_dev_desc_t *fs_dev_desc;
+static disk_partition_t fs_partition;
+static int fs_type = FS_TYPE_ANY;
+
+static inline int fs_ls_unsupported(const char *dirname)
+{
+ printf("** Unrecognized filesystem type **\n");
+ return -1;
+}
+
+static inline int fs_read_unsupported(const char *filename, ulong addr,
+ int offset, int len)
+{
+ printf("** Unrecognized filesystem type **\n");
+ return -1;
+}
+
+#ifdef CONFIG_FS_FAT
+static int fs_probe_fat(void)
+{
+ return fat_set_blk_dev(fs_dev_desc, &fs_partition);
+}
+
+static void fs_close_fat(void)
+{
+}
+
+#define fs_ls_fat file_fat_ls
+
+static int fs_read_fat(const char *filename, ulong addr, int offset, int len)
+{
+ int len_read;
+
+ len_read = file_fat_read_at(filename, offset,
+ (unsigned char *)addr, len);
+ if (len_read == -1) {
+ printf("** Unable to read file %s **\n", filename);
+ return -1;
+ }
+
+ return len_read;
+}
+#else
+static inline int fs_probe_fat(void)
+{
+ return -1;
+}
+
+static inline void fs_close_fat(void)
+{
+}
+
+#define fs_ls_fat fs_ls_unsupported
+#define fs_read_fat fs_read_unsupported
+#endif
+
+#ifdef CONFIG_FS_EXT4
+static int fs_probe_ext(void)
+{
+ ext4fs_set_blk_dev(fs_dev_desc, &fs_partition);
+
+ if (!ext4fs_mount(fs_partition.size)) {
+ ext4fs_close();
+ return -1;
+ }
+
+ return 0;
+}
+
+static void fs_close_ext(void)
+{
+ ext4fs_close();
+}
+
+#define fs_ls_ext ext4fs_ls
+
+static int fs_read_ext(const char *filename, ulong addr, int offset, int len)
+{
+ int file_len;
+ int len_read;
+
+ if (offset != 0) {
+ printf("** Cannot support non-zero offset **\n");
+ return -1;
+ }
+
+ file_len = ext4fs_open(filename);
+ if (file_len < 0) {
+ printf("** File not found %s **\n", filename);
+ ext4fs_close();
+ return -1;
+ }
+
+ if (len == 0)
+ len = file_len;
+
+ len_read = ext4fs_read((char *)addr, len);
+ ext4fs_close();
+
+ if (len_read != len) {
+ printf("** Unable to read file %s **\n", filename);
+ return -1;
+ }
+
+ return len_read;
+}
+#else
+static inline int fs_probe_ext(void)
+{
+ return -1;
+}
+
+static inline void fs_close_ext(void)
+{
+}
+
+#define fs_ls_ext fs_ls_unsupported
+#define fs_read_ext fs_read_unsupported
+#endif
+
+static const struct {
+ int fstype;
+ int (*probe)(void);
+} fstypes[] = {
+ {
+ .fstype = FS_TYPE_FAT,
+ .probe = fs_probe_fat,
+ },
+ {
+ .fstype = FS_TYPE_EXT,
+ .probe = fs_probe_ext,
+ },
+};
+
+int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype)
+{
+ int part, i;
+
+ part = get_device_and_partition(ifname, dev_part_str, &fs_dev_desc,
+ &fs_partition, 1);
+ if (part < 0)
+ return -1;
+
+ for (i = 0; i < ARRAY_SIZE(fstypes); i++) {
+ if ((fstype != FS_TYPE_ANY) && (fstype != fstypes[i].fstype))
+ continue;
+
+ if (!fstypes[i].probe()) {
+ fs_type = fstypes[i].fstype;
+ return 0;
+ }
+ }
+
+ printf("** Unrecognized filesystem type **\n");
+ return -1;
+}
+
+static void fs_close(void)
+{
+ switch (fs_type) {
+ case FS_TYPE_FAT:
+ fs_close_fat();
+ break;
+ case FS_TYPE_EXT:
+ fs_close_ext();
+ break;
+ default:
+ break;
+ }
+
+ fs_type = FS_TYPE_ANY;
+}
+
+int fs_ls(const char *dirname)
+{
+ int ret;
+
+ switch (fs_type) {
+ case FS_TYPE_FAT:
+ ret = fs_ls_fat(dirname);
+ break;
+ case FS_TYPE_EXT:
+ ret = fs_ls_ext(dirname);
+ break;
+ default:
+ ret = fs_ls_unsupported(dirname);
+ break;
+ }
+
+ fs_close();
+
+ return ret;
+}
+
+int fs_read(const char *filename, ulong addr, int offset, int len)
+{
+ int ret;
+
+ switch (fs_type) {
+ case FS_TYPE_FAT:
+ ret = fs_read_fat(filename, addr, offset, len);
+ break;
+ case FS_TYPE_EXT:
+ ret = fs_read_ext(filename, addr, offset, len);
+ break;
+ default:
+ ret = fs_read_unsupported(filename, addr, offset, len);
+ break;
+ }
+
+ fs_close();
+
+ return ret;
+}
+
+int do_fsload(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
+ int fstype)
+{
+ unsigned long addr;
+ const char *addr_str;
+ const char *filename;
+ unsigned long bytes;
+ unsigned long pos;
+ int len_read;
+ char buf[12];
+
+ if (argc < 5)
+ return CMD_RET_USAGE;
+
+ if (fs_set_blk_dev(argv[1], argv[2], fstype))
+ return 1;
+
+ if (argc >= 4) {
+ addr = simple_strtoul(argv[3], NULL, 0);
+ } else {
+ addr_str = getenv("loadaddr");
+ if (addr_str != NULL)
+ addr = simple_strtoul(addr_str, NULL, 16);
+ else
+ addr = CONFIG_SYS_LOAD_ADDR;
+ }
+ if (argc >= 5) {
+ filename = argv[4];
+ } else {
+ filename = getenv("bootfile");
+ if (!filename) {
+ puts("** No boot file defined **\n");
+ return 1;
+ }
+ }
+ if (argc >= 6)
+ bytes = simple_strtoul(argv[5], NULL, 0);
+ else
+ bytes = 0;
+ if (argc >= 7)
+ pos = simple_strtoul(argv[6], NULL, 0);
+ else
+ pos = 0;
+
+ len_read = fs_read(filename, addr, pos, bytes);
+ if (len_read <= 0)
+ return 1;
+
+ printf("%d bytes read\n", len_read);
+
+ sprintf(buf, "0x%x", len_read);
+ setenv("filesize", buf);
+
+ return 0;
+}
+
+int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
+ int fstype)
+{
+ if (argc < 2)
+ return CMD_RET_USAGE;
+
+ if (fs_set_blk_dev(argv[1], (argc >= 3) ? argv[2] : NULL, fstype))
+ return 1;
+
+ if (fs_ls(argc == 4 ? argv[3] : "/"))
+ return 1;
+
+ return 0;
+}
