2 * pass4.c -- pass #4 of e2fsck: Check reference counts
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
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)
20 * This routine is called when an inode is not connected to the
23 * This subroutine returns 1 then the caller shouldn't bother with the
24 * rest of the pass 4 tests.
26 static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i)
28 ext2_filsys fs = ctx->fs;
29 struct ext2_inode inode;
30 struct problem_context pctx;
32 e2fsck_read_inode(ctx, i, &inode, "pass4: disconnect_inode");
33 clear_problem_context(&pctx);
37 if (!inode.i_blocks && (LINUX_S_ISREG(inode.i_mode) ||
38 LINUX_S_ISDIR(inode.i_mode))) {
40 * This is a zero-length file; prompt to delete it...
42 if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
43 ext2fs_icount_store(ctx->inode_link_info, i, 0);
44 inode.i_links_count = 0;
45 inode.i_dtime = time(0);
46 e2fsck_write_inode(ctx, i, &inode,
49 * Fix up the bitmaps...
51 e2fsck_read_bitmaps(ctx);
52 ext2fs_unmark_inode_bitmap(ctx->inode_used_map, i);
53 ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, i);
54 ext2fs_unmark_inode_bitmap(fs->inode_map, i);
55 ext2fs_mark_ib_dirty(fs);
61 * Prompt to reconnect.
63 if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
64 if (e2fsck_reconnect_file(ctx, i))
65 ext2fs_unmark_valid(fs);
68 * If we don't attach the inode, then skip the
69 * i_links_test since there's no point in trying to
70 * force i_links_count to zero.
72 ext2fs_unmark_valid(fs);
79 void e2fsck_pass4(e2fsck_t ctx)
81 ext2_filsys fs = ctx->fs;
83 struct ext2_inode inode;
85 struct resource_track rtrack;
87 struct problem_context pctx;
88 __u16 link_count, link_counted;
92 init_resource_track(&rtrack);
96 mtrace_print("Pass 4");
99 clear_problem_context(&pctx);
101 if (!(ctx->options & E2F_OPT_PREEN))
102 fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
105 maxgroup = fs->group_desc_count;
107 if ((ctx->progress)(ctx, 4, 0, maxgroup))
110 for (i=1; i <= fs->super->s_inodes_count; i++) {
111 if ((i % fs->super->s_inodes_per_group) == 0) {
114 if ((ctx->progress)(ctx, 4, group, maxgroup))
117 if (i == EXT2_BAD_INO ||
118 (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
120 if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map, i)) ||
121 (ctx->inode_imagic_map &&
122 ext2fs_test_inode_bitmap(ctx->inode_imagic_map, i)) ||
123 (ctx->inode_bb_map &&
124 ext2fs_test_inode_bitmap(ctx->inode_bb_map, i)))
126 ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count);
127 ext2fs_icount_fetch(ctx->inode_count, i, &link_counted);
128 if (link_counted == 0) {
129 if (e2fsck_process_bad_inode(ctx, 0, i))
131 if (disconnect_inode(ctx, i))
133 ext2fs_icount_fetch(ctx->inode_link_info, i,
135 ext2fs_icount_fetch(ctx->inode_count, i,
138 if (link_counted != link_count) {
139 e2fsck_read_inode(ctx, i, &inode, "pass4");
142 if (link_count != inode.i_links_count) {
143 pctx.num = link_count;
145 PR_4_INCONSISTENT_COUNT, &pctx);
147 pctx.num = link_counted;
148 if (fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) {
149 inode.i_links_count = link_counted;
150 e2fsck_write_inode(ctx, i, &inode, "pass4");
154 ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0;
155 ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0;
156 ext2fs_free_inode_bitmap(ctx->inode_bb_map);
157 ctx->inode_bb_map = 0;
158 ext2fs_free_inode_bitmap(ctx->inode_imagic_map);
159 ctx->inode_imagic_map = 0;
160 #ifdef RESOURCE_TRACK
161 if (ctx->options & E2F_OPT_TIME2) {
162 e2fsck_clear_progbar(ctx);
163 print_resource_track(_("Pass 4"), &rtrack);