X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=fs%2Ffs.c;h=79d432d58fe094c8eb09e04204114b8bd0d7f172;hb=1ad6364eeb4f578e423081d1748e8a3fdf1ab01d;hp=be1855d1291f217b19720ae0faa45076eb0cc5ac;hpb=9f3fe6da27e2328285aa37149fce845da4e57560;p=platform%2Fkernel%2Fu-boot.git

diff --git a/fs/fs.c b/fs/fs.c
index be1855d..79d432d 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -41,6 +41,11 @@ static inline int fs_ls_unsupported(const char *dirname)
 	return -1;
 }
 
+static inline int fs_exists_unsupported(const char *filename)
+{
+	return 0;
+}
+
 static inline int fs_read_unsupported(const char *filename, void *buf,
 				      int offset, int len)
 {
@@ -59,9 +64,19 @@ static inline void fs_close_unsupported(void)
 
 struct fstype_info {
 	int fstype;
+	/*
+	 * Is it legal to pass NULL as .probe()'s  fs_dev_desc parameter? This
+	 * should be false in most cases. For "virtual" filesystems which
+	 * aren't based on a U-Boot block device (e.g. sandbox), this can be
+	 * set to true. This should also be true for the dumm entry at the end
+	 * of fstypes[], since that is essentially a "virtual" (non-existent)
+	 * filesystem.
+	 */
+	bool null_dev_desc_ok;
 	int (*probe)(block_dev_desc_t *fs_dev_desc,
 		     disk_partition_t *fs_partition);
 	int (*ls)(const char *dirname);
+	int (*exists)(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);
@@ -71,36 +86,46 @@ static struct fstype_info fstypes[] = {
 #ifdef CONFIG_FS_FAT
 	{
 		.fstype = FS_TYPE_FAT,
+		.null_dev_desc_ok = false,
 		.probe = fat_set_blk_dev,
 		.close = fat_close,
 		.ls = file_fat_ls,
+		.exists = fat_exists,
 		.read = fat_read_file,
+		.write = fs_write_unsupported,
 	},
 #endif
 #ifdef CONFIG_FS_EXT4
 	{
 		.fstype = FS_TYPE_EXT,
+		.null_dev_desc_ok = false,
 		.probe = ext4fs_probe,
 		.close = ext4fs_close,
 		.ls = ext4fs_ls,
+		.exists = ext4fs_exists,
 		.read = ext4_read_file,
+		.write = fs_write_unsupported,
 	},
 #endif
 #ifdef CONFIG_SANDBOX
 	{
 		.fstype = FS_TYPE_SANDBOX,
+		.null_dev_desc_ok = true,
 		.probe = sandbox_fs_set_blk_dev,
 		.close = sandbox_fs_close,
 		.ls = sandbox_fs_ls,
+		.exists = sandbox_fs_exists,
 		.read = fs_read_sandbox,
 		.write = fs_write_sandbox,
 	},
 #endif
 	{
 		.fstype = FS_TYPE_ANY,
+		.null_dev_desc_ok = true,
 		.probe = fs_probe_unsupported,
 		.close = fs_close_unsupported,
 		.ls = fs_ls_unsupported,
+		.exists = fs_exists_unsupported,
 		.read = fs_read_unsupported,
 		.write = fs_write_unsupported,
 	},
@@ -150,6 +175,9 @@ int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype)
 				fstype != info->fstype)
 			continue;
 
+		if (!fs_dev_desc && !info->null_dev_desc_ok)
+			continue;
+
 		if (!info->probe(fs_dev_desc, &fs_partition)) {
 			fs_type = info->fstype;
 			return 0;
@@ -182,6 +210,19 @@ int fs_ls(const char *dirname)
 	return ret;
 }
 
+int fs_exists(const char *filename)
+{
+	int ret;
+
+	struct fstype_info *info = fs_get_info(fs_type);
+
+	ret = info->exists(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);
@@ -212,16 +253,11 @@ int fs_write(const char *filename, ulong addr, int offset, int len)
 	void *buf;
 	int ret;
 
-	/*
-	 * We don't actually know how many bytes are being read, since len==0
-	 * means read the whole file.
-	 */
 	buf = map_sysmem(addr, len);
 	ret = info->write(filename, buf, offset, len);
 	unmap_sysmem(buf);
 
-	/* If we requested a specific number of bytes, check we got it */
-	if (ret >= 0 && len && ret != len) {
+	if (ret >= 0 && ret != len) {
 		printf("** Unable to write file %s **\n", filename);
 		ret = -1;
 	}
@@ -312,6 +348,15 @@ int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 	return 0;
 }
 
+int file_exists(const char *dev_type, const char *dev_part, const char *file,
+		int fstype)
+{
+	if (fs_set_blk_dev(dev_type, dev_part, fstype))
+		return 0;
+
+	return fs_exists(file);
+}
+
 int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 		int fstype)
 {