Changeset 1d6f507 in mainline for uspace/lib/ext2/libext2_superblock.c

Timestamp:

2011-02-14T22:20:09Z (14 years ago)

Author:

Martin Sucha <sucha14@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

d241aae

Parents:

3949e8a0

Message:

Add some basic sanity checks

File:

• uspace/lib/ext2/libext2_superblock.c (modified) (2 diffs)

uspace/lib/ext2/libext2_superblock.c

@@ -247 +247 @@
 }
 
+/**
+ * Get count of inodes per block group
+ * 
+ * @param sb pointer to superblock
+ */
+inline uint32_t ext2_superblock_get_inodes_per_group(ext2_superblock_t *sb)
+{
+        return uint32_t_le2host(sb->inodes_per_group);
+}
+
+/**
+ * Compute count of block groups present in the filesystem
+ * 
+ * @param sb pointer to superblock
+ */
+inline uint32_t ext2_superblock_get_block_group_count(ext2_superblock_t *sb)
+{
+        return ext2_superblock_get_total_block_count(sb) / 
+            ext2_superblock_get_blocks_per_group(sb);
+}
+
 /** Read a superblock directly from device (i.e. no libblock cache)
  * 
@@ -276 +297 @@
 }
 
+/** Check a superblock for sanity
+ * 
+ * @param sb    Pointer to superblock
+ * 
+ * @return              EOK on success or negative error code on failure.
+ */
+int ext2_superblock_check_sanity(ext2_superblock_t *sb)
+{
+        if (ext2_superblock_get_magic(sb) != EXT2_SUPERBLOCK_MAGIC) {
+                return ENOTSUP;
+        }
+        
+        if (ext2_superblock_get_rev_major(sb) > 1) {
+                return ENOTSUP;
+        }
+        
+        if (ext2_superblock_get_total_inode_count(sb) == 0) {
+                return ENOTSUP;
+        }
+        
+        if (ext2_superblock_get_total_block_count(sb) == 0) {
+                return ENOTSUP;
+        }
+        
+        if (ext2_superblock_get_blocks_per_group(sb) == 0) {
+                return ENOTSUP;
+        }
+        
+        if (ext2_superblock_get_fragments_per_group(sb) == 0) {
+                return ENOTSUP;
+        }
+        
+        // We don't support fragments smaller than block
+        if (ext2_superblock_get_block_size(sb) != 
+                    ext2_superblock_get_fragment_size(sb)) {
+                return ENOTSUP;
+        }
+        if (ext2_superblock_get_blocks_per_group(sb) !=
+                    ext2_superblock_get_fragments_per_group(sb)) {
+                return ENOTSUP;
+        }
+        
+        if (ext2_superblock_get_inodes_per_group(sb) == 0) {
+                return ENOTSUP;
+        }
+        
+        if (ext2_superblock_get_inode_size(sb) < 128) {
+                return ENOTSUP;
+        }
+        
+        if (ext2_superblock_get_first_inode(sb) < 11) {
+                return ENOTSUP;
+        }
+        
+        return EOK;
+}
+
 
 /** @}