Ocfs2/move_extents: helpers to update the group descriptor and global bitmap inode.

These helpers were actually borrowed from alloc.c, which may be publicized
later.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>

diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c
index ebaff62..390354a 100644 (file)
--- a/fs/ocfs2/move_extents.c
+++ b/fs/ocfs2/move_extents.c
@@ -555,3 +555,80 @@ static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
 
        mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
 }
+
+static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
+                                      handle_t *handle,
+                                      struct buffer_head *di_bh,
+                                      u32 num_bits,
+                                      u16 chain)
+{
+       int ret;
+       u32 tmp_used;
+       struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
+       struct ocfs2_chain_list *cl =
+                               (struct ocfs2_chain_list *) &di->id2.i_chain;
+
+       ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+                                     OCFS2_JOURNAL_ACCESS_WRITE);
+       if (ret < 0) {
+               mlog_errno(ret);
+               goto out;
+       }
+
+       tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
+       di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
+       le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
+       ocfs2_journal_dirty(handle, di_bh);
+
+out:
+       return ret;
+}
+
+static inline int ocfs2_block_group_set_bits(handle_t *handle,
+                                            struct inode *alloc_inode,
+                                            struct ocfs2_group_desc *bg,
+                                            struct buffer_head *group_bh,
+                                            unsigned int bit_off,
+                                            unsigned int num_bits)
+{
+       int status;
+       void *bitmap = bg->bg_bitmap;
+       int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
+
+       /* All callers get the descriptor via
+        * ocfs2_read_group_descriptor().  Any corruption is a code bug. */
+       BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
+       BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
+
+       mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off,
+            num_bits);
+
+       if (ocfs2_is_cluster_bitmap(alloc_inode))
+               journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
+
+       status = ocfs2_journal_access_gd(handle,
+                                        INODE_CACHE(alloc_inode),
+                                        group_bh,
+                                        journal_type);
+       if (status < 0) {
+               mlog_errno(status);
+               goto bail;
+       }
+
+       le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
+       if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
+               ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
+                           " count %u but claims %u are freed. num_bits %d",
+                           (unsigned long long)le64_to_cpu(bg->bg_blkno),
+                           le16_to_cpu(bg->bg_bits),
+                           le16_to_cpu(bg->bg_free_bits_count), num_bits);
+               return -EROFS;
+       }
+       while (num_bits--)
+               ocfs2_set_bit(bit_off++, bitmap);
+
+       ocfs2_journal_dirty(handle, group_bh);
+
+bail:
+       return status;
+}