Changeset ce6de59 in mainline for uspace/lib/ext4/libext4_extent.c

Timestamp:

2012-04-07T14:41:19Z (12 years ago)

Author:

Frantisek Princ <frantisek.princ@…>

Branches:

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

Children:

3b5c119

Parents:

5b16912

Message:

First part → allocating first block to extent (not for extent with some blocks)

File:

• uspace/lib/ext4/libext4_extent.c (modified) (1 diff)

uspace/lib/ext4/libext4_extent.c

@@ -539 +539 @@
 }
 
+int ext4_extent_append_block(ext4_inode_ref_t *inode_ref,
+                uint32_t *iblock, uint32_t *fblock)
+{
+        int rc;
+
+        ext4_superblock_t *sb = inode_ref->fs->superblock;
+        uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
+
+        ext4_extent_header_t *header =
+                        ext4_inode_get_extent_header(inode_ref->inode);
+
+        // Initialize if empty inode
+        if (inode_size == 0) {
+                ext4_extent_t *first = EXT4_EXTENT_FIRST(header);
+                ext4_extent_set_block_count(first, 0);
+                ext4_extent_set_first_block(first, 0);
+                ext4_extent_set_start(first, 0);
+
+                ext4_extent_header_set_depth(header, 0);
+                ext4_extent_header_set_entries_count(header, 1);
+        }
+
+        uint32_t block_size = ext4_superblock_get_block_size(sb);
+        uint32_t new_block_idx = inode_size / block_size;
+
+        ext4_extent_path_t *path;
+        rc = ext4_extent_find_extent(inode_ref, new_block_idx, &path);
+        if (rc != EOK) {
+                EXT4FS_DBG("find extent ERROR");
+                return rc;
+        }
+
+        // Jump to last item of the path (extent)
+        ext4_extent_path_t *path_ptr = path;
+        while (path_ptr->depth != 0) {
+                path_ptr++;
+        }
+
+        // Check if extent exists
+        assert(path_ptr->extent != NULL);
+
+        uint32_t phys_block;
+
+        if (ext4_extent_get_block_count(path_ptr->extent) == 0) {
+
+                // Add first block to the extent
+
+                rc = ext4_balloc_alloc_block(inode_ref, &phys_block);
+                if (rc != EOK) {
+                        EXT4FS_DBG("ERRO in balloc");
+                        return rc;
+                }
+
+                ext4_extent_set_block_count(path_ptr->extent, 1);
+                ext4_extent_set_start(path_ptr->extent, phys_block);
+
+                path_ptr->block->dirty = true;
+
+                goto finish;
+
+        } else {
+                // try allocate succeeding extent block
+
+                // TODO
+                assert(false);
+
+        }
+
+
+finish:
+        // Put loaded blocks
+        // From 1 -> 0 is a block with inode data
+        for (uint16_t i = 1; i < path->depth; ++i) {
+                if (path[i].block) {
+                        block_put(path[i].block);
+                }
+        }
+
+        // Destroy temporary data structure
+        free(path);
+
+        return EOK;
+}
+
 /**
  * @}