Changeset b73530a in mainline for uspace/lib/ext4/libext4_balloc.c

Timestamp:

2012-04-08T14:01:49Z (12 years ago)

Author:

Frantisek Princ <frantisek.princ@…>

Branches:

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

Children:

82cb6768

Parents:

936132f

Message:

appending fblock to existing extent

• actually not solved situation, when extent is full !!!

File:

• uspace/lib/ext4/libext4_balloc.c (modified) (1 diff)

uspace/lib/ext4/libext4_balloc.c

@@ -569 +569 @@
 }
 
+int ext4_balloc_try_alloc_block(ext4_inode_ref_t *inode_ref, uint32_t fblock)
+{
+        int rc;
+
+        ext4_filesystem_t *fs = inode_ref->fs;
+        ext4_superblock_t *sb = fs->superblock;
+
+        uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, fblock);
+        uint32_t index_in_group = ext4_balloc_blockaddr2_index_in_group(sb, fblock);
+
+        ext4_block_group_ref_t *bg_ref;
+        rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
+        if (rc != EOK) {
+                EXT4FS_DBG("error in loading bg_ref \%d", rc);
+                return rc;
+        }
+
+        uint32_t bitmap_block_addr = ext4_block_group_get_block_bitmap(
+                        bg_ref->block_group, sb);
+        block_t *bitmap_block;
+        rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
+        if (rc != EOK) {
+                EXT4FS_DBG("error in loading bitmap \%d", rc);
+                return rc;
+        }
+
+        bool free = ext4_bitmap_is_free_bit(bitmap_block->data, index_in_group);
+
+        if (free) {
+                ext4_bitmap_set_bit(bitmap_block->data, index_in_group);
+                bitmap_block->dirty = true;
+        }
+
+        rc = block_put(bitmap_block);
+        if (rc != EOK) {
+                // Error in saving bitmap
+                ext4_filesystem_put_block_group_ref(bg_ref);
+                EXT4FS_DBG("error in saving bitmap \%d", rc);
+                return rc;
+        }
+
+        if (!free) {
+                rc = EINVAL;
+                goto terminate;
+        }
+
+        uint32_t block_size = ext4_superblock_get_block_size(sb);
+
+        // Update superblock free blocks count
+        uint32_t sb_free_blocks = ext4_superblock_get_free_blocks_count(sb);
+        sb_free_blocks--;
+        ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
+
+        // Update inode blocks count
+        uint64_t ino_blocks = ext4_inode_get_blocks_count(sb, inode_ref->inode);
+        ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
+        ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
+        inode_ref->dirty = true;
+
+        // Update block group free blocks count
+        uint32_t free_blocks = ext4_block_group_get_free_blocks_count(
+                        bg_ref->block_group, sb);
+        free_blocks--;
+        ext4_block_group_set_free_blocks_count(bg_ref->block_group,
+                        sb, free_blocks);
+        bg_ref->dirty = true;
+
+terminate:
+
+        rc = ext4_filesystem_put_block_group_ref(bg_ref);
+        if (rc != EOK) {
+                EXT4FS_DBG("error in saving bg_ref \%d", rc);
+                return rc;
+        }
+
+        return rc;
+}
 
 /**