Changeset 6dd7f65 in mainline for uspace/lib/ext4/libext4_superblock.c

Timestamp:

2015-04-15T20:14:27Z (10 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

447201e

Parents:

749fe15b

Message:

libext4: add missing parts that will be needed to support flexible block groups

• Add function to read the superblock's fields "backup_bgs" (SUPER_SPARSE2).
• Add function to get the number of reserved GDT blocks.
• Drop the "s_" prefix from some superblock's fields.

File:

• uspace/lib/ext4/libext4_superblock.c (modified) (1 diff)

uspace/lib/ext4/libext4_superblock.c

@@ -1298 +1298 @@
 }
 
+/** Get the backup groups used with SPARSE_SUPER2
+ *
+ * @param sb    Pointer to the superblock
+ * @param g1    Output pointer to the first backup group
+ * @param g2    Output pointer to the second backup group
+ */
+void ext4_superblock_get_backup_groups_sparse2(ext4_superblock_t *sb,
+    uint32_t *g1, uint32_t *g2)
+{
+        *g1 = uint32_t_le2host(sb->backup_bgs[0]);
+        *g2 = uint32_t_le2host(sb->backup_bgs[1]);
+}
+
+/** Set the backup groups (SPARSE SUPER2)
+ *
+ * @param sb    Pointer to the superblock
+ * @param g1    Index of the first group
+ * @param g2    Index of the second group
+ */
+void ext4_superblock_set_backup_groups_sparse2(ext4_superblock_t *sb,
+    uint32_t g1, uint32_t g2)
+{
+        sb->backup_bgs[0] = host2uint32_t_le(g1);
+        sb->backup_bgs[1] = host2uint32_t_le(g2);
+}
+
+/** Get the number of blocks (per group) reserved to GDT expansion
+ *
+ * @param sb    Pointer to the superblock
+ *
+ * @return      Number of blocks
+ */
+uint32_t ext4_superblock_get_reserved_gdt_blocks(ext4_superblock_t *sb)
+{
+        return uint32_t_le2host(sb->reserved_gdt_blocks);
+}
+
+/** Set the number of blocks (per group) reserved to GDT expansion
+ *
+ * @param sb    Pointer to the superblock
+ * @param n     Number of reserved blocks
+ */
+void ext4_superblock_set_reserved_gdt_blocks(ext4_superblock_t *sb,
+    uint32_t n)
+{
+        sb->reserved_gdt_blocks = host2uint32_t_le(n);
+}
+
 /**
  * @}