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)
19 #include <ext2fs/ext2_ext_attr.h>
22 * This routine is called when an inode is not connected to the
25 * This subroutine returns 1 then the caller shouldn't bother with the
26 * rest of the pass 4 tests.
28 static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i,
29 struct ext2_inode *inode)
31 ext2_filsys fs = ctx->fs;
32 struct problem_context pctx;
36 if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
37 e2fsck_read_inode_full(ctx, i, inode,EXT2_INODE_SIZE(fs->super),
38 "pass4: disconnect_inode");
39 extra_size = ((struct ext2_inode_large *)inode)->i_extra_isize;
41 e2fsck_read_inode(ctx, i, inode, "pass4: disconnect_inode");
43 clear_problem_context(&pctx);
47 if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0)
48 eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE +
51 * Offer to delete any zero-length files that does not have
52 * blocks. If there is an EA block, it might have useful
53 * information, so we won't prompt to delete it, but let it be
54 * reconnected to lost+found.
56 if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC &&
57 (LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) {
58 if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
59 e2fsck_clear_inode(ctx, i, inode, 0,
62 * Fix up the bitmaps...
64 e2fsck_read_bitmaps(ctx);
65 ext2fs_inode_alloc_stats2(fs, i, -1,
66 LINUX_S_ISDIR(inode->i_mode));
67 quota_data_inodes(ctx->qctx, inode, i, -1);
73 * Prompt to reconnect.
75 if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
76 if (e2fsck_reconnect_file(ctx, i))
77 ext2fs_unmark_valid(fs);
80 * If we don't attach the inode, then skip the
81 * i_links_test since there's no point in trying to
82 * force i_links_count to zero.
84 ext2fs_unmark_valid(fs);
91 void e2fsck_pass4(e2fsck_t ctx)
93 ext2_filsys fs = ctx->fs;
95 struct ext2_inode *inode;
97 struct resource_track rtrack;
99 struct problem_context pctx;
100 __u16 link_count, link_counted;
104 init_resource_track(&rtrack, ctx->fs->io);
107 mtrace_print("Pass 4");
110 clear_problem_context(&pctx);
112 if (!(ctx->options & E2F_OPT_PREEN))
113 fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
116 maxgroup = fs->group_desc_count;
118 if ((ctx->progress)(ctx, 4, 0, maxgroup))
121 inode = e2fsck_allocate_memory(ctx, EXT2_INODE_SIZE(fs->super),
124 /* Protect loop from wrap-around if s_inodes_count maxed */
125 for (i=1; i <= fs->super->s_inodes_count && i > 0; i++) {
126 int isdir = ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i);
128 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
130 if ((i % fs->super->s_inodes_per_group) == 0) {
133 if ((ctx->progress)(ctx, 4, group, maxgroup))
136 if (i == EXT2_BAD_INO ||
137 (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
139 if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, i)) ||
140 (ctx->inode_imagic_map &&
141 ext2fs_test_inode_bitmap2(ctx->inode_imagic_map, i)) ||
142 (ctx->inode_bb_map &&
143 ext2fs_test_inode_bitmap2(ctx->inode_bb_map, i)))
145 ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count);
146 ext2fs_icount_fetch(ctx->inode_count, i, &link_counted);
147 if (link_counted == 0) {
149 buf = e2fsck_allocate_memory(ctx,
150 fs->blocksize, "bad_inode buffer");
151 if (e2fsck_process_bad_inode(ctx, 0, i, buf))
153 if (disconnect_inode(ctx, i, inode))
155 ext2fs_icount_fetch(ctx->inode_link_info, i,
157 ext2fs_icount_fetch(ctx->inode_count, i,
160 if (isdir && (link_counted > EXT2_LINK_MAX))
162 if (link_counted != link_count) {
163 e2fsck_read_inode(ctx, i, inode, "pass4");
166 if ((link_count != inode->i_links_count) && !isdir &&
167 (inode->i_links_count <= EXT2_LINK_MAX)) {
168 pctx.num = link_count;
170 PR_4_INCONSISTENT_COUNT, &pctx);
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");
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;
192 ext2fs_free_mem(&buf);
194 ext2fs_free_mem(&inode);
195 print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io);