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 */ 27 static 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 return 0; 67 } 68 } 69 70 /* 71 * Prompt to reconnect. 72 */ 73 if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) { 74 if (e2fsck_reconnect_file(ctx, i)) 75 ext2fs_unmark_valid(fs); 76 } else { 77 /* 78 * If we don't attach the inode, then skip the 79 * i_links_test since there's no point in trying to 80 * force i_links_count to zero. 81 */ 82 ext2fs_unmark_valid(fs); 83 return 1; 84 } 85 return 0; 86 } 87 88 89 void e2fsck_pass4(e2fsck_t ctx) 90 { 91 ext2_filsys fs = ctx->fs; 92 ext2_ino_t i; 93 struct ext2_inode *inode; 94 #ifdef RESOURCE_TRACK 95 struct resource_track rtrack; 96 #endif 97 struct problem_context pctx; 98 __u16 link_count, link_counted; 99 char *buf = 0; 100 int group, maxgroup; 101 102 init_resource_track(&rtrack, ctx->fs->io); 103 104 #ifdef MTRACE 105 mtrace_print("Pass 4"); 106 #endif 107 108 clear_problem_context(&pctx); 109 110 if (!(ctx->options & E2F_OPT_PREEN)) 111 fix_problem(ctx, PR_4_PASS_HEADER, &pctx); 112 113 group = 0; 114 maxgroup = fs->group_desc_count; 115 if (ctx->progress) 116 if ((ctx->progress)(ctx, 4, 0, maxgroup)) 117 return; 118 119 inode = e2fsck_allocate_memory(ctx, EXT2_INODE_SIZE(fs->super), 120 "scratch inode"); 121 122 /* Protect loop from wrap-around if s_inodes_count maxed */ 123 for (i=1; i <= fs->super->s_inodes_count && i > 0; i++) { 124 int isdir = ext2fs_test_inode_bitmap(ctx->inode_dir_map, i); 125 126 if (ctx->flags & E2F_FLAG_SIGNAL_MASK) 127 goto errout; 128 if ((i % fs->super->s_inodes_per_group) == 0) { 129 group++; 130 if (ctx->progress) 131 if ((ctx->progress)(ctx, 4, group, maxgroup)) 132 goto errout; 133 } 134 if (i == EXT2_BAD_INO || 135 (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super))) 136 continue; 137 if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map, i)) || 138 (ctx->inode_imagic_map && 139 ext2fs_test_inode_bitmap(ctx->inode_imagic_map, i)) || 140 (ctx->inode_bb_map && 141 ext2fs_test_inode_bitmap(ctx->inode_bb_map, i))) 142 continue; 143 ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count); 144 ext2fs_icount_fetch(ctx->inode_count, i, &link_counted); 145 if (link_counted == 0) { 146 if (!buf) 147 buf = e2fsck_allocate_memory(ctx, 148 fs->blocksize, "bad_inode buffer"); 149 if (e2fsck_process_bad_inode(ctx, 0, i, buf)) 150 continue; 151 if (disconnect_inode(ctx, i, inode)) 152 continue; 153 ext2fs_icount_fetch(ctx->inode_link_info, i, 154 &link_count); 155 ext2fs_icount_fetch(ctx->inode_count, i, 156 &link_counted); 157 } 158 if (isdir && (link_counted > EXT2_LINK_MAX)) 159 link_counted = 1; 160 if (link_counted != link_count) { 161 e2fsck_read_inode(ctx, i, inode, "pass4"); 162 pctx.ino = i; 163 pctx.inode = inode; 164 if ((link_count != inode->i_links_count) && !isdir && 165 (inode->i_links_count <= EXT2_LINK_MAX)) { 166 pctx.num = link_count; 167 fix_problem(ctx, 168 PR_4_INCONSISTENT_COUNT, &pctx); 169 } 170 pctx.num = link_counted; 171 /* i_link_count was previously exceeded, but no longer 172 * is, fix this but don't consider it an error */ 173 if ((isdir && link_counted > 1 && 174 (inode->i_flags & EXT2_INDEX_FL) && 175 link_count == 1 && !(ctx->options & E2F_OPT_NO)) || 176 fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) { 177 inode->i_links_count = link_counted; 178 e2fsck_write_inode(ctx, i, inode, "pass4"); 179 } 180 } 181 } 182 ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0; 183 ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0; 184 ext2fs_free_inode_bitmap(ctx->inode_bb_map); 185 ctx->inode_bb_map = 0; 186 ext2fs_free_inode_bitmap(ctx->inode_imagic_map); 187 ctx->inode_imagic_map = 0; 188 errout: 189 if (buf) 190 ext2fs_free_mem(&buf); 191 192 ext2fs_free_mem(&inode); 193 print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io); 194 } 195 196
