/** * node.c * * Many parts of codes are copied from Linux kernel/fs/f2fs. * * Copyright (C) 2015 Huawei Ltd. * Witten by: * Hou Pengyang * Liu Shuoran * Jaegeuk Kim * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include "fsck.h" #include "node.h" void f2fs_alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid, int inode) { struct f2fs_nm_info *nm_i = NM_I(sbi); struct f2fs_checkpoint *cp = F2FS_CKPT(sbi); nid_t i, inode_cnt, node_cnt; for (i = 0; i < nm_i->max_nid; i++) if(f2fs_test_bit(i, nm_i->nid_bitmap) == 0) break; ASSERT(i < nm_i->max_nid); f2fs_set_bit(i, nm_i->nid_bitmap); *nid = i; inode_cnt = get_cp(valid_inode_count); node_cnt = get_cp(valid_node_count); if (inode) set_cp(valid_inode_count, inode_cnt + 1); set_cp(valid_node_count, node_cnt + 1); } void set_data_blkaddr(struct dnode_of_data *dn) { __le32 *addr_array; struct f2fs_node *node_blk = dn->node_blk; unsigned int ofs_in_node = dn->ofs_in_node; addr_array = blkaddr_in_node(node_blk); addr_array[ofs_in_node] = cpu_to_le32(dn->data_blkaddr); if (dn->node_blk != dn->inode_blk) dn->ndirty = 1; else dn->idirty = 1; } /* * In this function, we get a new node blk, and write back * node_blk would be sloadd in RAM, linked by dn->node_blk */ block_t new_node_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn, unsigned int ofs) { struct f2fs_node *f2fs_inode; struct f2fs_node *node_blk; struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); struct f2fs_summary sum; struct node_info ni; block_t blkaddr; int type; f2fs_inode = dn->inode_blk; node_blk = calloc(BLOCK_SZ, 1); ASSERT(node_blk); node_blk->footer.nid = cpu_to_le32(dn->nid); node_blk->footer.ino = f2fs_inode->footer.ino; node_blk->footer.flag = cpu_to_le32(ofs << OFFSET_BIT_SHIFT); node_blk->footer.cp_ver = ckpt->checkpoint_ver; type = CURSEG_COLD_NODE; if (IS_DNODE(node_blk)) { if (S_ISDIR(le16_to_cpu(f2fs_inode->i.i_mode))) type = CURSEG_HOT_NODE; else type = CURSEG_WARM_NODE; } get_node_info(sbi, dn->nid, &ni); set_summary(&sum, dn->nid, 0, ni.version); reserve_new_block(sbi, &blkaddr, &sum, type); /* update nat info */ update_nat_blkaddr(sbi, le32_to_cpu(f2fs_inode->footer.ino), dn->nid, blkaddr); dn->node_blk = node_blk; inc_inode_blocks(dn); return blkaddr; } /* * get_node_path - Get the index path of pgoff_t block * @offset: offset in the current index node block. * @noffset: NO. of the index block within a file. * return: depth of the index path. * * By default, it sets inline_xattr and inline_data */ static int get_node_path(unsigned long block, int offset[4], unsigned int noffset[4]) { const long direct_index = DEF_ADDRS_PER_INODE_INLINE_XATTR; const long direct_blks = ADDRS_PER_BLOCK; const long dptrs_per_blk = NIDS_PER_BLOCK; const long indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK; const long dindirect_blks = indirect_blks * NIDS_PER_BLOCK; int n = 0; int level = 0; noffset[0] = 0; if (block < direct_index) { offset[n] = block; goto got; } block -= direct_index; if (block < direct_blks) { offset[n++] = NODE_DIR1_BLOCK; noffset[n]= 1; offset[n] = block; level = 1; goto got; } block -= direct_blks; if (block < direct_blks) { offset[n++] = NODE_DIR2_BLOCK; noffset[n] = 2; offset[n] = block; level = 1; goto got; } block -= direct_blks; if (block < indirect_blks) { offset[n++] = NODE_IND1_BLOCK; noffset[n] = 3; offset[n++] = block / direct_blks; noffset[n] = 4 + offset[n - 1]; offset[n] = block % direct_blks; level = 2; goto got; } block -= indirect_blks; if (block < indirect_blks) { offset[n++] = NODE_IND2_BLOCK; noffset[n] = 4 + dptrs_per_blk; offset[n++] = block / direct_blks; noffset[n] = 5 + dptrs_per_blk + offset[n - 1]; offset[n] = block % direct_blks; level = 2; goto got; } block -= indirect_blks; if (block < dindirect_blks) { offset[n++] = NODE_DIND_BLOCK; noffset[n] = 5 + (dptrs_per_blk * 2); offset[n++] = block / indirect_blks; noffset[n] = 6 + (dptrs_per_blk * 2) + offset[n - 1] * (dptrs_per_blk + 1); offset[n++] = (block / direct_blks) % dptrs_per_blk; noffset[n] = 7 + (dptrs_per_blk * 2) + offset[n - 2] * (dptrs_per_blk + 1) + offset[n - 1]; offset[n] = block % direct_blks; level = 3; goto got; } else { ASSERT(0); } got: return level; } void get_dnode_of_data(struct f2fs_sb_info *sbi, struct dnode_of_data *dn, pgoff_t index, int mode) { int offset[4]; unsigned int noffset[4]; struct f2fs_node *parent = NULL; nid_t nids[4]; block_t nblk[4]; struct node_info ni; int level, i; int ret; level = get_node_path(index, offset, noffset); nids[0] = dn->nid; parent = dn->inode_blk; if (level != 0) nids[1] = get_nid(parent, offset[0], 1); else dn->node_blk = dn->inode_blk; get_node_info(sbi, nids[0], &ni); nblk[0] = ni.blk_addr; for (i = 1; i <= level; i++) { if (!nids[i] && mode == ALLOC_NODE) { f2fs_alloc_nid(sbi, &nids[i], 0); dn->nid = nids[i]; /* Function new_node_blk get a new f2fs_node blk and update*/ /* We should make sure that dn->node_blk == NULL*/ nblk[i] = new_node_block(sbi, dn, noffset[i]); ASSERT(nblk[i]); set_nid(parent, offset[i - 1], nids[i], i == 1); } else { /* If Sparse file no read API, */ struct node_info ni; get_node_info(sbi, nids[i], &ni); dn->node_blk = calloc(BLOCK_SZ, 1); ASSERT(dn->node_blk); ret = dev_read_block(dn->node_blk, ni.blk_addr); ASSERT(ret >= 0); nblk[i] = ni.blk_addr; } if (mode == ALLOC_NODE){ /* Parent node may have changed */ ret = dev_write_block(parent, nblk[i - 1]); ASSERT(ret >= 0); } if (i != 1) free(parent); if (i < level) { parent = dn->node_blk; nids[i + 1] = get_nid(parent, offset[i], 0); } } dn->nid = nids[level]; dn->ofs_in_node = offset[level]; dn->data_blkaddr = datablock_addr(dn->node_blk, dn->ofs_in_node); dn->node_blkaddr = nblk[level]; }