[U-Boot] [PATCH v3 1/6] fs: ext4: do not allow writes if metadata checksum is active

[Jean-Jacques Hiblot]

u-boot does not supports updating the metadata chacksums

Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>
Reviewed-by: Tom Rini <trini at konsulko.com>

---

Changes in v3: None
Changes in v2:
- Prevent write access if metadata checksum is enabled

 fs/ext4/ext4_write.c | 12 ++++++++++--
 include/ext4fs.h     |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c
index a7f543f7df..1de29236f0 100644
--- a/fs/ext4/ext4_write.c
+++ b/fs/ext4/ext4_write.c
@@ -858,12 +858,19 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
 
 	g_parent_inode = zalloc(fs->inodesz);
 	if (!g_parent_inode)
-		goto fail;
+		goto fail_ext4fs_init;
 
 	if (ext4fs_init() != 0) {
 		printf("error in File System init\n");
-		return -1;
+		goto fail_ext4fs_init;
+	}
+
+	if (le32_to_cpu(fs->sb->feature_ro_compat) &
+		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) {
+		printf("u-boot doesn't support updating the metadata checksums yet\n");
+		goto fail;
 	}
+
 	inodes_per_block = fs->blksz / fs->inodesz;
 	parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
 	if (parent_inodeno == -1)
@@ -990,6 +997,7 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
 	return 0;
 fail:
 	ext4fs_deinit();
+fail_ext4fs_init:
 	free(inode_buffer);
 	free(g_parent_inode);
 	free(temp_ptr);
diff --git a/include/ext4fs.h b/include/ext4fs.h
index bb55639107..bcf440364e 100644
--- a/include/ext4fs.h
+++ b/include/ext4fs.h
@@ -32,6 +32,7 @@
 #define EXT4_EXTENTS_FL		0x00080000 /* Inode uses extents */
 #define EXT4_EXT_MAGIC			0xf30a
 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM	0x0010
+#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
 #define EXT4_FEATURE_INCOMPAT_EXTENTS	0x0040
 #define EXT4_FEATURE_INCOMPAT_64BIT	0x0080
 #define EXT4_INDIRECT_BLOCKS		12
-- 
2.17.1