static int find_group_orlov(struct super_block *sb, struct inode *parent) { int parent_group = EXT3_I(parent)->i_block_group; struct ext3_sb_info *sbi = EXT3_SB(sb); struct ext3_super_block *es = sbi->s_es; int ngroups = sbi->s_groups_count; int inodes_per_group = EXT3_INODES_PER_GROUP(sb); int freei, avefreei; int freeb, avefreeb; int blocks_per_dir, ndirs; int max_debt, max_dirs, min_blocks, min_inodes; int group = -1, i; struct ext3_group_desc *desc; struct buffer_head *bh; freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); avefreei = freei / ngroups; freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter); avefreeb = freeb / ngroups; ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); if ((parent == sb->s_root->d_inode) || (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) { int best_ndir = inodes_per_group; int best_group = -1; get_random_bytes(&group, sizeof(group)); parent_group = (unsigned)group % ngroups; for (i = 0; i < ngroups; i++) { group = (parent_group + i) % ngroups; desc = ext3_get_group_desc (sb, group, &bh); if (!desc || !desc->bg_free_inodes_count) continue; if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir) continue; if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) continue; if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb) continue; best_group = group; best_ndir = le16_to_cpu(desc->bg_used_dirs_count); } if (best_group >= 0) return best_group; goto fallback; } blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - freeb) / ndirs; max_dirs = ndirs / ngroups + inodes_per_group / 16; min_inodes = avefreei - inodes_per_group / 4; min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4; max_debt = EXT3_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, BLOCK_COST); if (max_debt * INODE_COST > inodes_per_group) max_debt = inodes_per_group / INODE_COST; if (max_debt > 255) max_debt = 255; if (max_debt == 0) max_debt = 1; for (i = 0; i < ngroups; i++) { group = (parent_group + i) % ngroups; desc = ext3_get_group_desc (sb, group, &bh); if (!desc || !desc->bg_free_inodes_count) continue; if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs) continue; if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes) continue; if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks) continue; return group; } fallback: for (i = 0; i < ngroups; i++) { group = (parent_group + i) % ngroups; desc = ext3_get_group_desc (sb, group, &bh); if (!desc || !desc->bg_free_inodes_count) continue; if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei) return group; } if (avefreei) { /* * The free-inodes counter is approximate, and for really small * filesystems the above test can fail to find any blockgroups */ avefreei = 0; goto fallback; } return -1; }
/* * NOTE! When we get the inode, we're the only people * that have access to it, and as such there are no * race conditions we have to worry about. The inode * is not on the hash-lists, and it cannot be reached * through the filesystem because the directory entry * has been deleted earlier. * * HOWEVER: we must make sure that we get no aliases, * which means that we have to call "clear_inode()" * _before_ we mark the inode not in use in the inode * bitmaps. Otherwise a newly created file might use * the same inode number (not actually the same pointer * though), and then we'd have two inodes sharing the * same inode number and space on the harddisk. */ void ext3_free_inode (handle_t *handle, struct inode * inode) { struct super_block * sb = inode->i_sb; int is_directory; unsigned long ino; struct buffer_head *bitmap_bh = NULL; struct buffer_head *bh2; unsigned long block_group; unsigned long bit; struct ext3_group_desc * gdp; struct ext3_super_block * es; struct ext3_sb_info *sbi; int fatal = 0, err; if (atomic_read(&inode->i_count) > 1) { printk ("ext3_free_inode: inode has count=%d\n", atomic_read(&inode->i_count)); return; } if (inode->i_nlink) { printk ("ext3_free_inode: inode has nlink=%d\n", inode->i_nlink); return; } if (!sb) { printk("ext3_free_inode: inode on nonexistent device\n"); return; } sbi = EXT3_SB(sb); ino = inode->i_ino; ext3_debug ("freeing inode %lu\n", ino); is_directory = S_ISDIR(inode->i_mode); es = EXT3_SB(sb)->s_es; if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { ext3_error (sb, "ext3_free_inode", "reserved or nonexistent inode %lu", ino); goto error_return; } block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb); bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb); bitmap_bh = read_inode_bitmap(sb, block_group); if (!bitmap_bh) goto error_return; BUFFER_TRACE(bitmap_bh, "get_write_access"); fatal = ext3_journal_get_write_access(handle, bitmap_bh); if (fatal) goto error_return; /* Ok, now we can actually update the inode bitmaps.. */ if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, block_group), bit, bitmap_bh->b_data)) ext3_error (sb, "ext3_free_inode", "bit already cleared for inode %lu", ino); else { gdp = ext3_get_group_desc (sb, block_group, &bh2); BUFFER_TRACE(bh2, "get_write_access"); fatal = ext3_journal_get_write_access(handle, bh2); if (fatal) goto error_return; if (gdp) { spin_lock(sb_bgl_lock(sbi, block_group)); le16_add_cpu(&gdp->bg_free_inodes_count, 1); if (is_directory) le16_add_cpu(&gdp->bg_used_dirs_count, -1); spin_unlock(sb_bgl_lock(sbi, block_group)); percpu_counter_inc(&sbi->s_freeinodes_counter); if (is_directory) percpu_counter_dec(&sbi->s_dirs_counter); } BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata"); err = ext3_journal_dirty_metadata(handle, bh2); if (!fatal) fatal = err; } BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata"); err = ext3_journal_dirty_metadata(handle, bitmap_bh); if (!fatal) fatal = err; error_return: brelse(bitmap_bh); ext3_std_error(sb, fatal); }
static int find_group_orlov(struct super_block *sb, struct inode *parent) { int parent_group = EXT3_I(parent)->i_block_group; struct ext3_sb_info *sbi = EXT3_SB(sb); int ngroups = sbi->s_groups_count; int inodes_per_group = EXT3_INODES_PER_GROUP(sb); unsigned int freei, avefreei; ext3_fsblk_t freeb, avefreeb; unsigned int ndirs; int max_dirs, min_inodes; ext3_grpblk_t min_blocks; int group = -1, i; struct ext3_group_desc *desc; freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); avefreei = freei / ngroups; freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter); avefreeb = freeb / ngroups; ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); if ((parent == sb->s_root->d_inode) || (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) { int best_ndir = inodes_per_group; int best_group = -1; group = prandom_u32(); parent_group = (unsigned)group % ngroups; for (i = 0; i < ngroups; i++) { group = (parent_group + i) % ngroups; desc = ext3_get_group_desc (sb, group, NULL); if (!desc || !desc->bg_free_inodes_count) continue; if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir) continue; if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) continue; if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb) continue; best_group = group; best_ndir = le16_to_cpu(desc->bg_used_dirs_count); } if (best_group >= 0) return best_group; goto fallback; } max_dirs = ndirs / ngroups + inodes_per_group / 16; min_inodes = avefreei - inodes_per_group / 4; min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4; for (i = 0; i < ngroups; i++) { group = (parent_group + i) % ngroups; desc = ext3_get_group_desc (sb, group, NULL); if (!desc || !desc->bg_free_inodes_count) continue; if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs) continue; if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes) continue; if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks) continue; return group; } fallback: for (i = 0; i < ngroups; i++) { group = (parent_group + i) % ngroups; desc = ext3_get_group_desc (sb, group, NULL); if (!desc || !desc->bg_free_inodes_count) continue; if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei) return group; } if (avefreei) { /* * The free-inodes counter is approximate, and for really small * filesystems the above test can fail to find any blockgroups */ avefreei = 0; goto fallback; } return -1; }
/* * There are two policies for allocating an inode. If the new inode is * a directory, then a forward search is made for a block group with both * free space and a low directory-to-inode ratio; if that fails, then of * the groups with above-average free space, that group with the fewest * directories already is chosen. * * For other inodes, search forward from the parent directory's block * group to find a free inode. */ struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode) { struct super_block *sb; struct buffer_head *bitmap_bh = NULL; struct buffer_head *bh2; int group; unsigned long ino = 0; struct inode * inode; struct ext3_group_desc * gdp = NULL; struct ext3_super_block * es; struct ext3_inode_info *ei; struct ext3_sb_info *sbi; int err = 0; struct inode *ret; int i; /* Cannot create files in a deleted directory */ if (!dir || !dir->i_nlink) return ERR_PTR(-EPERM); sb = dir->i_sb; inode = new_inode(sb); if (!inode) return ERR_PTR(-ENOMEM); ei = EXT3_I(inode); sbi = EXT3_SB(sb); es = sbi->s_es; if (S_ISDIR(mode)) { if (test_opt (sb, OLDALLOC)) group = find_group_dir(sb, dir); else group = find_group_orlov(sb, dir); } else group = find_group_other(sb, dir); err = -ENOSPC; if (group == -1) goto out; for (i = 0; i < sbi->s_groups_count; i++) { err = -EIO; gdp = ext3_get_group_desc(sb, group, &bh2); if (!gdp) goto fail; brelse(bitmap_bh); bitmap_bh = read_inode_bitmap(sb, group); if (!bitmap_bh) goto fail; ino = 0; repeat_in_this_group: ino = ext3_find_next_zero_bit((unsigned long *) bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino); if (ino < EXT3_INODES_PER_GROUP(sb)) { BUFFER_TRACE(bitmap_bh, "get_write_access"); err = ext3_journal_get_write_access(handle, bitmap_bh); if (err) goto fail; if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group), ino, bitmap_bh->b_data)) { /* we won it */ BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata"); err = ext3_journal_dirty_metadata(handle, bitmap_bh); if (err) goto fail; goto got; } /* we lost it */ journal_release_buffer(handle, bitmap_bh); if (++ino < EXT3_INODES_PER_GROUP(sb)) goto repeat_in_this_group; } /* * This case is possible in concurrent environment. It is very * rare. We cannot repeat the find_group_xxx() call because * that will simply return the same blockgroup, because the * group descriptor metadata has not yet been updated. * So we just go onto the next blockgroup. */ if (++group == sbi->s_groups_count) group = 0; } err = -ENOSPC; goto out; got: ino += group * EXT3_INODES_PER_GROUP(sb) + 1; if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { ext3_error (sb, "ext3_new_inode", "reserved inode or inode > inodes count - " "block_group = %d, inode=%lu", group, ino); err = -EIO; goto fail; } BUFFER_TRACE(bh2, "get_write_access"); err = ext3_journal_get_write_access(handle, bh2); if (err) goto fail; spin_lock(sb_bgl_lock(sbi, group)); le16_add_cpu(&gdp->bg_free_inodes_count, -1); if (S_ISDIR(mode)) { le16_add_cpu(&gdp->bg_used_dirs_count, 1); } spin_unlock(sb_bgl_lock(sbi, group)); BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata"); err = ext3_journal_dirty_metadata(handle, bh2); if (err) goto fail; percpu_counter_dec(&sbi->s_freeinodes_counter); if (S_ISDIR(mode)) percpu_counter_inc(&sbi->s_dirs_counter); if (test_opt(sb, GRPID)) { inode->i_mode = mode; inode->i_uid = current_fsuid(); inode->i_gid = dir->i_gid; } else inode_init_owner(inode, dir, mode); inode->i_ino = ino; /* This is the optimal IO size (for stat), not the fs block size */ inode->i_blocks = 0; inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; memset(ei->i_data, 0, sizeof(ei->i_data)); ei->i_dir_start_lookup = 0; ei->i_disksize = 0; ei->i_flags = ext3_mask_flags(mode, EXT3_I(dir)->i_flags & EXT3_FL_INHERITED); #ifdef EXT3_FRAGMENTS ei->i_faddr = 0; ei->i_frag_no = 0; ei->i_frag_size = 0; #endif ei->i_file_acl = 0; ei->i_dir_acl = 0; ei->i_dtime = 0; ei->i_block_alloc_info = NULL; ei->i_block_group = group; ext3_set_inode_flags(inode); if (IS_DIRSYNC(inode)) handle->h_sync = 1; if (insert_inode_locked(inode) < 0) { err = -EINVAL; goto fail_drop; } spin_lock(&sbi->s_next_gen_lock); inode->i_generation = sbi->s_next_generation++; spin_unlock(&sbi->s_next_gen_lock); ei->i_state_flags = 0; ext3_set_inode_state(inode, EXT3_STATE_NEW); ei->i_extra_isize = (EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) ? sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE : 0; ret = inode; dquot_initialize(inode); err = dquot_alloc_inode(inode); if (err) goto fail_drop; err = ext3_init_acl(handle, inode, dir); if (err) goto fail_free_drop; err = ext3_init_security(handle,inode, dir); if (err) goto fail_free_drop; err = ext3_mark_inode_dirty(handle, inode); if (err) { ext3_std_error(sb, err); goto fail_free_drop; } ext3_debug("allocating inode %lu\n", inode->i_ino); goto really_out; fail: ext3_std_error(sb, err); out: iput(inode); ret = ERR_PTR(err); really_out: brelse(bitmap_bh); return ret; fail_free_drop: dquot_free_inode(inode); fail_drop: dquot_drop(inode); inode->i_flags |= S_NOQUOTA; inode->i_nlink = 0; unlock_new_inode(inode); iput(inode); brelse(bitmap_bh); return ERR_PTR(err); }
/* * There are two policies for allocating an inode. If the new inode is * a directory, then a forward search is made for a block group with both * free space and a low directory-to-inode ratio; if that fails, then of * the groups with above-average free space, that group with the fewest * directories already is chosen. * * For other inodes, search forward from the parent directory's block * group to find a free inode. */ struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode) { struct super_block *sb; struct buffer_head *bitmap_bh = NULL; struct buffer_head *bh2; int group; unsigned long ino = 0; struct inode * inode; struct ext3_group_desc * gdp = NULL; struct ext3_super_block * es; struct ext3_inode_info *ei; struct ext3_sb_info *sbi; int err = 0; struct inode *ret; int i; /* Cannot create files in a deleted directory */ if (!dir || !dir->i_nlink) return ERR_PTR(-EPERM); sb = dir->i_sb; inode = new_inode(sb); if (!inode) return ERR_PTR(-ENOMEM); ei = EXT3_I(inode); sbi = EXT3_SB(sb); es = sbi->s_es; if (S_ISDIR(mode)) { if (test_opt (sb, OLDALLOC)) group = find_group_dir(sb, dir); else group = find_group_orlov(sb, dir); } else group = find_group_other(sb, dir); err = -ENOSPC; if (group == -1) goto out; for (i = 0; i < sbi->s_groups_count; i++) { gdp = ext3_get_group_desc(sb, group, &bh2); err = -EIO; brelse(bitmap_bh); bitmap_bh = read_inode_bitmap(sb, group); if (!bitmap_bh) goto fail; ino = 0; repeat_in_this_group: ino = ext3_find_next_zero_bit((unsigned long *) bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino); if (ino < EXT3_INODES_PER_GROUP(sb)) { int credits = 0; BUFFER_TRACE(bitmap_bh, "get_write_access"); err = ext3_journal_get_write_access_credits(handle, bitmap_bh, &credits); if (err) goto fail; if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group), ino, bitmap_bh->b_data)) { /* we won it */ BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata"); err = ext3_journal_dirty_metadata(handle, bitmap_bh); if (err) goto fail; goto got; } /* we lost it */ journal_release_buffer(handle, bitmap_bh, credits); if (++ino < EXT3_INODES_PER_GROUP(sb)) goto repeat_in_this_group; } /* * This case is possible in concurrent environment. It is very * rare. We cannot repeat the find_group_xxx() call because * that will simply return the same blockgroup, because the * group descriptor metadata has not yet been updated. * So we just go onto the next blockgroup. */ if (++group == sbi->s_groups_count) group = 0; } err = -ENOSPC; goto out; got: ino += group * EXT3_INODES_PER_GROUP(sb) + 1; if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { ext3_error (sb, "ext3_new_inode", "reserved inode or inode > inodes count - " "block_group = %d, inode=%lu", group, ino); err = -EIO; goto fail; } BUFFER_TRACE(bh2, "get_write_access"); err = ext3_journal_get_write_access(handle, bh2); if (err) goto fail; spin_lock(sb_bgl_lock(sbi, group)); gdp->bg_free_inodes_count = cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1); if (S_ISDIR(mode)) { gdp->bg_used_dirs_count = cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1); } spin_unlock(sb_bgl_lock(sbi, group)); BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata"); err = ext3_journal_dirty_metadata(handle, bh2); if (err) goto fail; percpu_counter_dec(&sbi->s_freeinodes_counter); if (S_ISDIR(mode)) percpu_counter_inc(&sbi->s_dirs_counter); sb->s_dirt = 1; inode->i_uid = current->fsuid; if (test_opt (sb, GRPID)) inode->i_gid = dir->i_gid; else if (dir->i_mode & S_ISGID) { inode->i_gid = dir->i_gid; if (S_ISDIR(mode)) mode |= S_ISGID; } else inode->i_gid = current->fsgid; inode->i_mode = mode; inode->i_ino = ino; /* This is the optimal IO size (for stat), not the fs block size */ inode->i_blksize = PAGE_SIZE; inode->i_blocks = 0; inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; memset(ei->i_data, 0, sizeof(ei->i_data)); ei->i_next_alloc_block = 0; ei->i_next_alloc_goal = 0; ei->i_dir_start_lookup = 0; ei->i_disksize = 0; ei->i_flags = EXT3_I(dir)->i_flags & ~EXT3_INDEX_FL; if (S_ISLNK(mode)) ei->i_flags &= ~(EXT3_IMMUTABLE_FL|EXT3_APPEND_FL); /* dirsync only applies to directories */ if (!S_ISDIR(mode)) ei->i_flags &= ~EXT3_DIRSYNC_FL; #ifdef EXT3_FRAGMENTS ei->i_faddr = 0; ei->i_frag_no = 0; ei->i_frag_size = 0; #endif ei->i_file_acl = 0; ei->i_dir_acl = 0; ei->i_dtime = 0; #ifdef EXT3_PREALLOCATE ei->i_prealloc_block = 0; ei->i_prealloc_count = 0; #endif ei->i_block_group = group; ext3_set_inode_flags(inode); if (IS_DIRSYNC(inode)) handle->h_sync = 1; insert_inode_hash(inode); spin_lock(&sbi->s_next_gen_lock); inode->i_generation = sbi->s_next_generation++; spin_unlock(&sbi->s_next_gen_lock); ei->i_state = EXT3_STATE_NEW; ret = inode; if(DQUOT_ALLOC_INODE(inode)) { DQUOT_DROP(inode); err = -EDQUOT; goto fail2; } err = ext3_init_acl(handle, inode, dir); if (err) { DQUOT_FREE_INODE(inode); goto fail2; } err = ext3_mark_inode_dirty(handle, inode); if (err) { ext3_std_error(sb, err); DQUOT_FREE_INODE(inode); goto fail2; } ext3_debug("allocating inode %lu\n", inode->i_ino); goto really_out; fail: ext3_std_error(sb, err); out: iput(inode); ret = ERR_PTR(err); really_out: brelse(bitmap_bh); return ret; fail2: inode->i_flags |= S_NOQUOTA; inode->i_nlink = 0; iput(inode); brelse(bitmap_bh); return ERR_PTR(err); }