Changeset eef306c in mainline for uspace/lib/ext2/libext2_filesystem.c

Timestamp:

2011-03-09T16:16:27Z (14 years ago)

Author:

Martin Sucha <sucha14@…>

Branches:

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

Children:

868ef40

Parents:

e2abab03

Message:

Check filesystem feature flags when mounting

File:

• uspace/lib/ext2/libext2_filesystem.c (modified) (1 diff)

uspace/lib/ext2/libext2_filesystem.c

@@ -109 +109 @@
 
 /**
+ * Check feature flags
+ * 
+ * @param fs Pointer to ext2_filesystem_t to check
+ * @param read_only bool to set to true if the fs needs to be read-only
+ * @return EOK on success or negative error code on failure
+ */
+int ext2_filesystem_check_flags(ext2_filesystem_t *fs, bool *o_read_only)
+{
+        // feature flags are present in rev 1 and later
+        if (ext2_superblock_get_rev_major(fs->superblock) == 0) {
+                *o_read_only = false;
+                return 0;
+        }
+        
+        uint32_t incompatible;
+        uint32_t read_only;
+        
+        incompatible = ext2_superblock_get_features_incompatible(fs->superblock);
+        read_only = ext2_superblock_get_features_read_only(fs->superblock);
+        
+        // unset any supported features
+        incompatible &= ~EXT2_SUPPORTED_INCOMPATIBLE_FEATURES;
+        read_only &= ~EXT2_SUPPORTED_READ_ONLY_FEATURES;
+        
+        if (incompatible > 0) {
+                *o_read_only = true;
+                return ENOTSUP;
+        }
+        
+        if (read_only > 0) {
+                *o_read_only = true;
+        }
+        
+        return EOK;
+}
+
+/**
  * Get a reference to block descriptor
  *