ref: cc9f824615037c65f4b6b47ee50e9e77b3d8e6e1
parent: f299d69a087f3df4c1f0a19262a8971cefc9b9b7
author: ngkaho1234 <[email protected]>
date: Fri Oct 23 18:50:01 EDT 2015
METADATA_CSUM: ext4_extent_full added.
--- a/lwext4/ext4_extent_full.c
+++ b/lwext4/ext4_extent_full.c
@@ -30,6 +30,7 @@
#include "ext4_blockdev.h"
#include "ext4_fs.h"
#include "ext4_super.h"
+#include "ext4_crc32c.h"
#include "ext4_balloc.h"
#include "ext4_debug.h"
@@ -308,6 +309,42 @@
return newblock;
}
+static uint32_t ext4_ext_block_csum(struct ext4_inode_ref *inode_ref,
+ struct ext4_extent_header *eh)
+{+ uint32_t checksum = 0;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+
+ if (ext4_sb_has_feature_read_only(sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {+ uint32_t ino_index = to_le32(inode_ref->index);
+ uint32_t ino_gen =
+ to_le32(ext4_inode_get_generation(inode_ref->inode));
+ /* First calculate crc32 checksum against fs uuid */
+ checksum = ext4_crc32c(~0, sb->uuid, sizeof(sb->uuid));
+ /* Then calculate crc32 checksum against inode number
+ * and inode generation */
+ checksum = ext4_crc32c(checksum, &ino_index,
+ sizeof(ino_index));
+ checksum = ext4_crc32c(checksum, &ino_gen,
+ sizeof(ino_gen));
+ /* Finally calculate crc32 checksum against
+ * the entire extent block up to the checksum field */
+ checksum = ext4_crc32c(checksum, eh,
+ EXT4_EXTENT_TAIL_OFFSET(eh));
+ }
+ return checksum;
+}
+
+static void ext4_extent_block_csum_set(struct ext4_inode_ref *inode_ref,
+ struct ext4_extent_header *eh)
+{+ struct ext4_extent_tail *tail;
+
+ tail = find_ext4_extent_tail(eh);
+ tail->et_checksum = ext4_ext_block_csum(inode_ref, eh);
+}
+
static int ext4_ext_dirty(struct ext4_inode_ref *inode_ref,
struct ext4_extent_path *path)
{@@ -316,6 +353,7 @@
else
inode_ref->dirty = true;
+ ext4_extent_block_csum_set(inode_ref, path->header);
return EOK;
}
@@ -336,26 +374,6 @@
ext4_block_set(inode_ref->fs->bdev, &path->block);
}
}
-}
-
-/*
- * Temporarily we don't need to support checksum.
- */
-static uint32_t ext4_ext_block_csum(struct ext4_inode_ref *inode_ref __unused,
- struct ext4_extent_header *eh __unused)
-{- /*TODO: should we add crc32 here ?*/
- /*return ext4_crc32c(inode->i_csum, eh, EXT4_EXTENT_TAIL_OFFSET(eh));*/
- return 0;
-}
-
-static void ext4_extent_block_csum_set(struct ext4_inode_ref *inode_ref,
- struct ext4_extent_header *eh)
-{- struct ext4_extent_tail *tail;
-
- tail = find_ext4_extent_tail(eh);
- tail->et_checksum = ext4_ext_block_csum(inode_ref, eh);
}
/*