static int ocfs2_block_group_fill(handle_t *handle, struct inode *alloc_inode, struct buffer_head *bg_bh, u64 group_blkno, u16 my_chain, struct ocfs2_chain_list *cl) { int status = 0; struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; struct super_block * sb = alloc_inode->i_sb; mlog_entry_void(); if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) { ocfs2_error(alloc_inode->i_sb, "group block (%llu) != " "b_blocknr (%llu)", (unsigned long long)group_blkno, (unsigned long long) bg_bh->b_blocknr); status = -EIO; goto bail; } status = ocfs2_journal_access(handle, alloc_inode, bg_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (status < 0) { mlog_errno(status); goto bail; } memset(bg, 0, sb->s_blocksize); strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE); bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation); bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb)); bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl)); bg->bg_chain = cpu_to_le16(my_chain); bg->bg_next_group = cl->cl_recs[my_chain].c_blkno; bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno); bg->bg_blkno = cpu_to_le64(group_blkno); /* set the 1st bit in the bitmap to account for the descriptor block */ ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap); bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1); status = ocfs2_journal_dirty(handle, bg_bh); if (status < 0) mlog_errno(status); /* There is no need to zero out or otherwise initialize the * other blocks in a group - All valid FS metadata in a block * group stores the superblock fs_generation value at * allocation time. */ bail: mlog_exit(status); return status; }
static void mess_up_superblock_clusters(ocfs2_filesys *fs, int excess) { errcode_t ret; char *buf = NULL; struct ocfs2_dinode *di = fs->fs_super; uint32_t new_clusters, cpg, wrong; /* corrupt superblock, just copy the * superblock, change it and * write it back to disk. */ ret = ocfs2_malloc_block(fs->fs_io, &buf); if (ret) FSWRK_COM_FATAL(progname, ret); memcpy(buf, (char *)di, fs->fs_blocksize); di = (struct ocfs2_dinode *)buf; cpg = 8 * ocfs2_group_bitmap_size(fs->fs_blocksize, 0, OCFS2_RAW_SB(fs->fs_super)->s_feature_incompat); /* make the wrong value to 2.5 times of cluster_per_group. */ wrong = cpg * 2 + cpg / 2; if (excess) new_clusters = di->i_clusters + wrong; else new_clusters = di->i_clusters - wrong; fprintf(stdout, "Corrupt SUPERBLOCK_CLUSTERS: " "change superblock i_clusters from %u to %u.\n", di->i_clusters, new_clusters); di->i_clusters = new_clusters; ret = io_write_block(fs->fs_io, di->i_blkno, 1, buf); if (ret) FSWRK_COM_FATAL(progname, ret); if(buf) ocfs2_free(&buf); return; }
/* Add a new group descriptor to global_bitmap. */ int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input) { int ret; handle_t *handle; struct buffer_head *main_bm_bh = NULL; struct inode *main_bm_inode = NULL; struct ocfs2_dinode *fe = NULL; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct buffer_head *group_bh = NULL; struct ocfs2_group_desc *group = NULL; struct ocfs2_chain_list *cl; struct ocfs2_chain_rec *cr; u16 cl_bpc; if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) return -EROFS; main_bm_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE, OCFS2_INVALID_SLOT); if (!main_bm_inode) { ret = -EINVAL; mlog_errno(ret); goto out; } mutex_lock(&main_bm_inode->i_mutex); ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); if (ret < 0) { mlog_errno(ret); goto out_mutex; } fe = (struct ocfs2_dinode *)main_bm_bh->b_data; if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != ocfs2_group_bitmap_size(osb->sb, 0, osb->s_feature_incompat) * 8) { mlog(ML_ERROR, "The disk is too old and small." " Force to do offline resize."); ret = -EINVAL; goto out_unlock; } ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh); if (ret < 0) { mlog(ML_ERROR, "Can't read the group descriptor # %llu " "from the device.", (unsigned long long)input->group); goto out_unlock; } ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh); ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh); if (ret) { mlog_errno(ret); goto out_unlock; } trace_ocfs2_group_add((unsigned long long)input->group, input->chain, input->clusters, input->frees); handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS); if (IS_ERR(handle)) { mlog_errno(PTR_ERR(handle)); ret = -EINVAL; goto out_unlock; } cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); cl = &fe->id2.i_chain; cr = &cl->cl_recs[input->chain]; ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode), group_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret < 0) { mlog_errno(ret); goto out_commit; } group = (struct ocfs2_group_desc *)group_bh->b_data; group->bg_next_group = cr->c_blkno; ocfs2_journal_dirty(handle, group_bh); ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode), main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret < 0) { mlog_errno(ret); goto out_commit; } if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) { le16_add_cpu(&cl->cl_next_free_rec, 1); memset(cr, 0, sizeof(struct ocfs2_chain_rec)); } cr->c_blkno = cpu_to_le64(input->group); le32_add_cpu(&cr->c_total, input->clusters * cl_bpc); le32_add_cpu(&cr->c_free, input->frees * cl_bpc); le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc); le32_add_cpu(&fe->id1.bitmap1.i_used, (input->clusters - input->frees) * cl_bpc); le32_add_cpu(&fe->i_clusters, input->clusters); ocfs2_journal_dirty(handle, main_bm_bh); spin_lock(&OCFS2_I(main_bm_inode)->ip_lock); OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits); spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock); i_size_write(main_bm_inode, le64_to_cpu(fe->i_size)); ocfs2_update_super_and_backups(main_bm_inode, input->clusters); out_commit: ocfs2_commit_trans(osb, handle); out_unlock: brelse(group_bh); brelse(main_bm_bh); ocfs2_inode_unlock(main_bm_inode, 1); out_mutex: mutex_unlock(&main_bm_inode->i_mutex); iput(main_bm_inode); out: return ret; }
/* * Extend the filesystem to the new number of clusters specified. This entry * point is only used to extend the current filesystem to the end of the last * existing group. */ int ocfs2_group_extend(struct inode * inode, int new_clusters) { int ret; handle_t *handle; struct buffer_head *main_bm_bh = NULL; struct buffer_head *group_bh = NULL; struct inode *main_bm_inode = NULL; struct ocfs2_dinode *fe = NULL; struct ocfs2_group_desc *group = NULL; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); u16 cl_bpc; u32 first_new_cluster; u64 lgd_blkno; if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) return -EROFS; if (new_clusters < 0) return -EINVAL; else if (new_clusters == 0) return 0; main_bm_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE, OCFS2_INVALID_SLOT); if (!main_bm_inode) { ret = -EINVAL; mlog_errno(ret); goto out; } mutex_lock(&main_bm_inode->i_mutex); ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); if (ret < 0) { mlog_errno(ret); goto out_mutex; } fe = (struct ocfs2_dinode *)main_bm_bh->b_data; /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(), * so any corruption is a code bug. */ BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != ocfs2_group_bitmap_size(osb->sb, 0, osb->s_feature_incompat) * 8) { mlog(ML_ERROR, "The disk is too old and small. " "Force to do offline resize."); ret = -EINVAL; goto out_unlock; } first_new_cluster = le32_to_cpu(fe->i_clusters); lgd_blkno = ocfs2_which_cluster_group(main_bm_inode, first_new_cluster - 1); ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno, &group_bh); if (ret < 0) { mlog_errno(ret); goto out_unlock; } group = (struct ocfs2_group_desc *)group_bh->b_data; cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters > le16_to_cpu(fe->id2.i_chain.cl_cpg)) { ret = -EINVAL; goto out_unlock; } trace_ocfs2_group_extend( (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters); handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS); if (IS_ERR(handle)) { mlog_errno(PTR_ERR(handle)); ret = -EINVAL; goto out_unlock; } /* update the last group descriptor and inode. */ ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode, main_bm_bh, group_bh, first_new_cluster, new_clusters); if (ret) { mlog_errno(ret); goto out_commit; } ocfs2_update_super_and_backups(main_bm_inode, new_clusters); out_commit: ocfs2_commit_trans(osb, handle); out_unlock: brelse(group_bh); brelse(main_bm_bh); ocfs2_inode_unlock(main_bm_inode, 1); out_mutex: mutex_unlock(&main_bm_inode->i_mutex); iput(main_bm_inode); out: return ret; }
unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb) { unsigned int la_mb; unsigned int gd_mb; unsigned int la_max_mb; unsigned int megs_per_slot; struct super_block *sb = osb->sb; gd_mb = ocfs2_clusters_to_megabytes(osb->sb, 8 * ocfs2_group_bitmap_size(sb, 0, osb->s_feature_incompat)); /* * This takes care of files systems with very small group * descriptors - 512 byte blocksize at cluster sizes lower * than 16K and also 1k blocksize with 4k cluster size. */ if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192) || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096)) return OCFS2_LA_OLD_DEFAULT; /* * Leave enough room for some block groups and make the final * value we work from a multiple of 4. */ gd_mb -= 16; gd_mb &= 0xFFFFFFFB; la_mb = gd_mb; /* * Keep window sizes down to a reasonable default */ if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) { /* * Some clustersize / blocksize combinations will have * given us a larger than OCFS2_LA_MAX_DEFAULT_MB * default size, but get poor distribution when * limited to exactly 256 megabytes. * * As an example, 16K clustersize at 4K blocksize * gives us a cluster group size of 504M. Paring the * local alloc size down to 256 however, would give us * only one window and around 200MB left in the * cluster group. Instead, find the first size below * 256 which would give us an even distribution. * * Larger cluster group sizes actually work out pretty * well when pared to 256, so we don't have to do this * for any group that fits more than two * OCFS2_LA_MAX_DEFAULT_MB windows. */ if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB)) la_mb = 256; else { unsigned int gd_mult = gd_mb; while (gd_mult > 256) gd_mult = gd_mult >> 1; la_mb = gd_mult; } } megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots; megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot); /* Too many nodes, too few disk clusters. */ if (megs_per_slot < la_mb) la_mb = megs_per_slot; /* We can't store more bits than we can in a block. */ la_max_mb = ocfs2_clusters_to_megabytes(osb->sb, ocfs2_local_alloc_size(sb) * 8); if (la_mb > la_max_mb) la_mb = la_max_mb; return la_mb; }
unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb) { unsigned int la_mb; unsigned int gd_mb; unsigned int la_max_mb; unsigned int megs_per_slot; struct super_block *sb = osb->sb; gd_mb = ocfs2_clusters_to_megabytes(osb->sb, 8 * ocfs2_group_bitmap_size(sb, 0, osb->s_feature_incompat)); /* */ if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192) || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096)) return OCFS2_LA_OLD_DEFAULT; /* */ gd_mb -= 16; gd_mb &= 0xFFFFFFFB; la_mb = gd_mb; /* */ if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) { /* */ if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB)) la_mb = 256; else { unsigned int gd_mult = gd_mb; while (gd_mult > 256) gd_mult = gd_mult >> 1; la_mb = gd_mult; } } megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots; megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot); /* */ if (megs_per_slot < la_mb) la_mb = megs_per_slot; /* */ la_max_mb = ocfs2_clusters_to_megabytes(osb->sb, ocfs2_local_alloc_size(sb) * 8); if (la_mb > la_max_mb) la_mb = la_max_mb; return la_mb; }