1/* 2 * pass4.c -- pass #4 of e2fsck: Check reference counts 3 * 4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Public 8 * License. 9 * %End-Header% 10 * 11 * Pass 4 frees the following data structures: 12 * - A bitmap of which inodes are in bad blocks. (inode_bb_map) 13 * - A bitmap of which inodes are imagic inodes. (inode_imagic_map) 14 */ 15 16#include "e2fsck.h" 17#include "problem.h" 18#include <ext2fs/ext2_ext_attr.h> 19 20/* 21 * This routine is called when an inode is not connected to the 22 * directory tree. 23 * 24 * This subroutine returns 1 then the caller shouldn't bother with the 25 * rest of the pass 4 tests. 26 */ 27static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i, 28 struct ext2_inode *inode) 29{ 30 ext2_filsys fs = ctx->fs; 31 struct problem_context pctx; 32 __u32 eamagic = 0; 33 int extra_size = 0; 34 35 if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE) { 36 e2fsck_read_inode_full(ctx, i, inode,EXT2_INODE_SIZE(fs->super), 37 "pass4: disconnect_inode"); 38 extra_size = ((struct ext2_inode_large *)inode)->i_extra_isize; 39 } else { 40 e2fsck_read_inode(ctx, i, inode, "pass4: disconnect_inode"); 41 } 42 clear_problem_context(&pctx); 43 pctx.ino = i; 44 pctx.inode = inode; 45 46 if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0) 47 eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE + 48 extra_size); 49 /* 50 * Offer to delete any zero-length files that does not have 51 * blocks. If there is an EA block, it might have useful 52 * information, so we won't prompt to delete it, but let it be 53 * reconnected to lost+found. 54 */ 55 if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC && 56 (LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) { 57 if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) { 58 e2fsck_clear_inode(ctx, i, inode, 0, 59 "disconnect_inode"); 60 /* 61 * Fix up the bitmaps... 62 */ 63 e2fsck_read_bitmaps(ctx); 64 ext2fs_inode_alloc_stats2(fs, i, -1, 65 LINUX_S_ISDIR(inode->i_mode)); 66 quota_data_inodes(ctx->qctx, inode, i, -1); 67 return 0; 68 } 69 } 70 71 /* 72 * Prompt to reconnect. 73 */ 74 if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) { 75 if (e2fsck_reconnect_file(ctx, i)) 76 ext2fs_unmark_valid(fs); 77 } else { 78 /* 79 * If we don't attach the inode, then skip the 80 * i_links_test since there's no point in trying to 81 * force i_links_count to zero. 82 */ 83 ext2fs_unmark_valid(fs); 84 return 1; 85 } 86 return 0; 87} 88 89 90void e2fsck_pass4(e2fsck_t ctx) 91{ 92 ext2_filsys fs = ctx->fs; 93 ext2_ino_t i; 94 struct ext2_inode *inode; 95#ifdef RESOURCE_TRACK 96 struct resource_track rtrack; 97#endif 98 struct problem_context pctx; 99 __u16 link_count, link_counted; 100 char *buf = 0; 101 dgrp_t group, maxgroup; 102 103 init_resource_track(&rtrack, ctx->fs->io); 104 105#ifdef MTRACE 106 mtrace_print("Pass 4"); 107#endif 108 109 clear_problem_context(&pctx); 110 111 if (!(ctx->options & E2F_OPT_PREEN)) 112 fix_problem(ctx, PR_4_PASS_HEADER, &pctx); 113 114 group = 0; 115 maxgroup = fs->group_desc_count; 116 if (ctx->progress) 117 if ((ctx->progress)(ctx, 4, 0, maxgroup)) 118 return; 119 120 inode = e2fsck_allocate_memory(ctx, EXT2_INODE_SIZE(fs->super), 121 "scratch inode"); 122 123 /* Protect loop from wrap-around if s_inodes_count maxed */ 124 for (i=1; i <= fs->super->s_inodes_count && i > 0; i++) { 125 int isdir; 126 127 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 128 goto errout; 129 if ((i % fs->super->s_inodes_per_group) == 0) { 130 group++; 131 if (ctx->progress) 132 if ((ctx->progress)(ctx, 4, group, maxgroup)) 133 goto errout; 134 } 135 if (i == EXT2_BAD_INO || 136 (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super))) 137 continue; 138 if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, i)) || 139 (ctx->inode_imagic_map && 140 ext2fs_test_inode_bitmap2(ctx->inode_imagic_map, i)) || 141 (ctx->inode_bb_map && 142 ext2fs_test_inode_bitmap2(ctx->inode_bb_map, i))) 143 continue; 144 ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count); 145 ext2fs_icount_fetch(ctx->inode_count, i, &link_counted); 146 if (link_counted == 0) { 147 if (!buf) 148 buf = e2fsck_allocate_memory(ctx, 149 fs->blocksize, "bad_inode buffer"); 150 if (e2fsck_process_bad_inode(ctx, 0, i, buf)) 151 continue; 152 if (disconnect_inode(ctx, i, inode)) 153 continue; 154 ext2fs_icount_fetch(ctx->inode_link_info, i, 155 &link_count); 156 ext2fs_icount_fetch(ctx->inode_count, i, 157 &link_counted); 158 } 159 isdir = ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i); 160 if (isdir && (link_counted > EXT2_LINK_MAX)) 161 link_counted = 1; 162 if (link_counted != link_count) { 163 e2fsck_read_inode(ctx, i, inode, "pass4"); 164 pctx.ino = i; 165 pctx.inode = inode; 166 if ((link_count != inode->i_links_count) && !isdir && 167 (inode->i_links_count <= EXT2_LINK_MAX)) { 168 pctx.num = link_count; 169 fix_problem(ctx, 170 PR_4_INCONSISTENT_COUNT, &pctx); 171 } 172 pctx.num = link_counted; 173 /* i_link_count was previously exceeded, but no longer 174 * is, fix this but don't consider it an error */ 175 if ((isdir && link_counted > 1 && 176 (inode->i_flags & EXT2_INDEX_FL) && 177 link_count == 1 && !(ctx->options & E2F_OPT_NO)) || 178 fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) { 179 inode->i_links_count = link_counted; 180 e2fsck_write_inode(ctx, i, inode, "pass4"); 181 } 182 } 183 } 184 ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0; 185 ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0; 186 ext2fs_free_inode_bitmap(ctx->inode_bb_map); 187 ctx->inode_bb_map = 0; 188 ext2fs_free_inode_bitmap(ctx->inode_imagic_map); 189 ctx->inode_imagic_map = 0; 190errout: 191 if (buf) 192 ext2fs_free_mem(&buf); 193 194 ext2fs_free_mem(&inode); 195 print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io); 196} 197 198